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WO2018180703A1 - Manufacturing method for emitter - Google Patents

Manufacturing method for emitter Download PDF

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Publication number
WO2018180703A1
WO2018180703A1 PCT/JP2018/010798 JP2018010798W WO2018180703A1 WO 2018180703 A1 WO2018180703 A1 WO 2018180703A1 JP 2018010798 W JP2018010798 W JP 2018010798W WO 2018180703 A1 WO2018180703 A1 WO 2018180703A1
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WO
WIPO (PCT)
Prior art keywords
emitter
ridges
irrigation liquid
tube
manufacturing
Prior art date
Application number
PCT/JP2018/010798
Other languages
French (fr)
Japanese (ja)
Inventor
大輔 守越
Original Assignee
株式会社エンプラス
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社エンプラス filed Critical 株式会社エンプラス
Publication of WO2018180703A1 publication Critical patent/WO2018180703A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G25/00—Watering gardens, fields, sports grounds or the like
    • A01G25/02—Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for drip irrigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion

Definitions

  • the present invention relates to a method for manufacturing an emitter.
  • drip irrigation has been known as one of the plant cultivation methods.
  • the drip irrigation method is a method in which a drip irrigation tube is arranged on the soil in which plants are planted, and irrigation liquid such as water or liquid fertilizer is dropped from the drip irrigation tube to the soil.
  • irrigation liquid such as water or liquid fertilizer
  • a drip irrigation tube usually has a tube formed with a plurality of through holes through which irrigation liquid is discharged, and a plurality of emitters (also referred to as “drippers”) for discharging the irrigation liquid from each through hole.
  • emitters there are known an emitter that is used while being joined to the inner wall surface of the tube (see, for example, Patent Document 1), and an emitter that is used by piercing the tube from the outside.
  • Patent Document 1 describes an emitter bonded to the inner wall surface of a tube.
  • the emitter described in Patent Document 1 includes a water intake portion for taking in irrigation liquid, a discharge portion for discharging irrigation liquid, which faces the discharge port penetrating the tube, and the water intake portion and discharge And a flow path through which the irrigation liquid is distributed.
  • the emitter described in Patent Document 1 is a screen portion having a wedge wire structure in which a plurality of ridges are arranged in a water intake portion.
  • the screen part which has the said wedge wire structure can prevent that a suspended
  • Patent Document 1 describes that the emitter can be manufactured by injection molding or the like.
  • the plurality of ridges constituting the wedge wire structure as the emitter described in Patent Document 1 has an undercut at the time of molding.
  • the undercut is released from the mold by sliding the mold inward or outward.
  • the plurality of ridges are arranged adjacent to each other at a narrow interval in the concave portion constituting the water intake portion, a space for sliding the mold cannot be secured, and the normal undercut is performed. The treatment cannot be released from the mold.
  • the plurality of ridges are released from the mold by so-called unreasonable pulling, by pulling the mold in the height direction of the ridge while deforming the molded body (emitter). Since the emitter as described in Patent Document 1 is made of a flexible material, it can be released without force, and easily returns to its original shape even after force removal. However, even when an emitter is manufactured using such a material, deformation or breakage of the ridge when forcibly removed can occur.
  • an object of the present invention is to provide a method of manufacturing an emitter having a plurality of ridges constituting a wedge wire structure, and capable of manufacturing the plurality of ridges without forcibly removing them. .
  • an emitter manufacturing method is an inner wall surface of a tube through which an irrigation liquid is circulated, and is joined to a position corresponding to a discharge port communicating between the inside and the outside of the tube, An emitter manufacturing method for quantitatively discharging the irrigation liquid in a tube from the discharge port to the outside of the tube.
  • the emitter is provided on the first surface side of an emitter body having a first surface and a second surface that are in a reverse relation to each other, and a water intake portion for taking in the irrigation liquid, and the emitter body
  • a irrigation unit which is provided on the second surface side, connects the discharge unit that can discharge the irrigation liquid to the outside of the tube when arranged facing the discharge port, and the water intake unit and the discharge unit.
  • a flow channel through which the liquid for use flows, and the water intake portion has a plurality of ridges arranged on the first surface side so as to be wider than the second surface side.
  • the manufacturing method produces an intermediate molded body of the emitter having a plurality of temporary ridges having a height higher than the ridges of the emitter at respective positions where the ridges of the water intake portion are arranged. And a step of plastically deforming the plurality of provisional ridges to form the plurality of ridges.
  • the emitter manufacturing method according to the present invention can manufacture an emitter having a plurality of ridges constituting a wedge wire structure without forcibly removing the plurality of ridges.
  • FIG. 1A and 1B are cross-sectional views of a drip irrigation tube having an emitter manufactured according to the present invention.
  • 2A and 2B are diagrams showing the configuration of an emitter manufactured according to the present invention.
  • 3A to 3C are diagrams showing the configuration of an emitter manufactured according to the present invention.
  • 4A and 4B are diagrams showing the configuration of an emitter manufactured according to the present invention.
  • FIG. 5 is an enlarged cross-sectional view of the circular portion D shown in FIG. 3C.
  • FIG. 6 is a schematic diagram for explaining a method for manufacturing an emitter according to an embodiment of the present invention.
  • FIG. 7 is an enlarged schematic view for explaining a method for manufacturing an emitter according to an embodiment of the present invention.
  • FIG. 8 is an enlarged schematic view for explaining a method for manufacturing an emitter according to another embodiment of the present invention.
  • FIG. 1A is a cross-sectional view in a direction along the axis of a drip irrigation tube 100 having an emitter 120 manufactured according to the present invention
  • FIG. 1B is a cross-sectional view in a direction perpendicular to the axis of the drip irrigation tube 100. .
  • the drip irrigation tube 100 has a tube 110 and an emitter 120.
  • the tube 110 is a tube for flowing irrigation liquid.
  • the material of the tube 110 is not specifically limited, For example, it can be set as polyethylene.
  • a plurality of discharge ports 112 for discharging irrigation liquid at predetermined intervals (for example, 200 to 500 mm) in the axial direction of the tube 110 are formed on the tube wall of the tube 110.
  • the diameter of the opening of the discharge port 112 is not particularly limited as long as the irrigation liquid can be discharged, and can be 1.5 mm, for example.
  • Emitters 120 are respectively joined to positions corresponding to the discharge ports 112 on the inner wall surface of the tube 110.
  • the cross-sectional shape and cross-sectional area perpendicular to the axial direction of the tube 110 are not particularly limited as long as the emitter 120 can be disposed inside the tube 110.
  • the drip irrigation tube 100 is manufactured by joining the emitter 120 to the inner wall surface of the tube 110.
  • the method for joining the tube 110 and the emitter 120 is not particularly limited. Examples of the method for joining the tube 110 and the emitter 120 include welding of a resin material constituting the emitter 120 or the tube 110, adhesion by an adhesive, and the like.
  • the discharge port 112 is normally formed after joining the tube 110 and the emitter 120, it may be formed before joining.
  • FIG. 2A is a plan view of the emitter 120 before the emitter body 122 and the film 124 are joined
  • FIG. 2B is a bottom view of the emitter 120 before the emitter body 122 and the film 124 are joined.
  • 3A is a front view of the emitter 120 before joining the emitter body 122 and the film 124
  • FIG. 3B is a cross-sectional view taken along the line AA shown in FIG. 2A
  • FIG. 3C is a cross-sectional view of FIG. It is sectional drawing of the BB line shown.
  • 4A is a side view of the emitter 120 before the emitter body 122 and the film 124 are joined
  • FIG. 4B is a cross-sectional view of the emitter body 122 taken along the line CC shown in FIG. 2A.
  • FIG. 5 is an enlarged cross-sectional view of the circular portion D shown in FIG. 3C.
  • the emitter 120 is joined to the inner wall surface of the tube 110 so as to cover the discharge port 112.
  • the shape of the emitter 120 is not particularly limited as long as it can adhere to the inner wall surface of the tube 110 and cover the discharge port 112.
  • the shape of the second surface 120b joined to the inner wall surface of the tube 110 in the cross section of the emitter 120 perpendicular to the axial direction of the tube 110 is such that the inner surface of the tube 110 is aligned with the inner wall surface of the tube 110. It has a substantially arc shape that is convex toward the wall surface.
  • the planar shape of the emitter 120 is a substantially rectangular shape with four corners rounded.
  • the size of the emitter 120 is not particularly limited. For example, the length of the emitter 120 in the long side direction can be 25 mm, the length in the short side direction can be 8 mm, and the height can be 2.5 mm.
  • the emitter 120 has a first surface 120 a and a second surface 120 b that are in reverse relation to each other, and the second surface 120 b is joined to the inner wall surface of the tube 110, and the emitter body 122 is joined to the emitter body 122. And a film 124.
  • the emitter body 122 and the film 124 are integrally formed via a hinge portion 126 (see FIGS. 2A and 2B).
  • Both the emitter main body 122 and the film 124 are formed of one kind of flexible material.
  • Examples of the material of the emitter body 122 and the film 124 include resin and rubber.
  • Examples of the resin include polyethylene and silicone.
  • the flexibility of the emitter body 122 and the film 124 can be adjusted by using a resin material having elasticity. Examples of methods for adjusting the flexibility of the emitter body 122 and the film 124 include selection of a resin having elasticity, adjustment of a mixing ratio of a resin material having elasticity to a hard resin material, and the like.
  • the emitter body 122 includes a water intake 131, a first connection groove 132 that becomes the first connection flow path 141, a first pressure reduction groove 133 that becomes the first pressure reduction flow path 142, and a second pressure that becomes the second pressure reduction flow path 144.
  • the decompression groove 134, the second connection groove 135 serving as the second connection flow path 145, the flow rate reduction unit 136, the flow path opening / closing unit 137, and the discharge unit 138 are provided.
  • the water intake part 131, the flow rate reduction part 136, and the flow path opening / closing part 137 are disposed on the first surface 120 a side of the emitter body 122.
  • the first connection groove 132, the first pressure reduction groove 133, the second pressure reduction groove 134, the discharge part 138, and the second connection groove 135 are disposed on the second surface 120 b side of the emitter body 122.
  • the film 124 and the emitter body 122 are joined together, and the emitter body 122 and the tube 110 are joined together, whereby the first connection groove 132, the first decompression groove 133, the second decompression groove 134, and the second connection groove 135 are joined.
  • a first connection channel 141 a first decompression channel 142, a second decompression channel 144, and a second connection channel 145, respectively.
  • the first intake passage 131, the first connection passage 141, the first decompression passage 142, the flow rate reduction portion 136, and the discharge portion 138 are formed, and the first passage 143 that connects the intake portion 131 and the discharge portion 138 is formed.
  • the intake section 131, the first connection flow path 141, the second decompression flow path 144, the flow path opening / closing section 137, the second connection flow path 145, the flow rate reduction section 136, and the discharge section 138 are configured.
  • a second flow path 146 that connects the portion 138 is formed.
  • the irrigation liquid is circulated from the water intake section 131 to the discharge section 138.
  • the emitter body 122 is connected to the flow rate reducing unit 136 downstream of the channel opening / closing unit 137 of the second channel 146, and between the flow rate reducing unit 136 and the discharge unit 138 is connected to the first channel 143 and the first channel 143.
  • the two flow paths 146 overlap.
  • the water intake portion 131 is disposed in a region on the first surface 120a side of the emitter body 122 (see FIG. 2A). In the region of the first surface 120a where the water intake portion 131 is not disposed, a flow rate reducing portion 136 and a flow path opening / closing portion 137 (film 124) are disposed.
  • the water intake portion 131 includes a screen portion 151 and a plurality of water intake through holes 152.
  • the screen 151 prevents the suspended matter in the irrigation liquid introduced into the emitter body 122 from the first surface 120a side from entering the water intake recess 153.
  • the screen portion 151 is open to the inside of the tube 110 and has a water intake recess 153 and a ridge 154.
  • the water intake recess 153 is one recess formed in the entire region where the film 124 is not bonded on the first surface 120 a of the emitter body 122.
  • the depth of the water intake recess 153 is not particularly limited, and is appropriately set depending on the size of the emitter body 122.
  • a protrusion 154 is formed on the bottom surface of the water intake recess 153.
  • a water intake through hole 152 is formed on the bottom surface of the water intake recess 153.
  • the protrusion 154 is disposed on the bottom surface of the water intake recess 153.
  • the arrangement and number of the ridges 154 are not particularly limited as long as the irrigation liquid can be taken in from the opening side of the water intake recess 153 and the intrusion of suspended matter in the irrigation liquid can be prevented.
  • the ridges 154 are arranged along the minor axis direction of the emitter body 122 and a plurality of first ridges 155 arranged in the major axis direction of the emitter body 122, and 1 arranged along the major axis direction of the emitter body 122. Two second ridges 156.
  • the first ridge 155 is formed so that the width on the first surface 120a side is wider than that on the second surface 120b side (see FIG. 5). That is, the first ridge 155 is formed on the first surface 120a side when the width in the major axis direction of the emitter body 122 is measured at any two points whose positions are different in the height direction (the thickness direction of the emitter body 122). The point has two points that are wider than the point on the second surface 120b side.
  • line 155 is the widest in the top part. Moreover, the distance between the adjacent 1st protruding item
  • line 155 can suppress the pressure loss of the water which flowed in into the recessed part 153 for water intake.
  • the second ridge 156 may be formed so that the width increases from the bottom surface side of the water intake recess 153 toward the first surface 120a side of the emitter body 122. Further, it may be formed to have the same width from the bottom surface of the water intake recess 153 to the first surface 120 a of the emitter body 122.
  • the water intake through hole 152 is formed on the bottom surface of the water intake recess 153.
  • the shape, position, and number of the water intake through holes 152 are not particularly limited as long as the irrigation liquid taken into the water intake recess 153 can be taken into the emitter body 122.
  • the water intake through hole 152 is a single long hole formed along the long axis direction of the bottom surface of the water intake recess 153.
  • the long hole is covered with a plurality of first ridges 155. Therefore, when viewed from the front side, the water intake through hole 152 appears to be divided into a large number of through holes.
  • the first connection groove 132 (first connection flow path 141) connects the water intake through hole 152 (water intake part 131) to the first pressure reduction groove 133 and the second pressure reduction groove 134.
  • the first connection groove 132 is formed in a substantially U shape along the outer edge on the second surface 120 b side of the emitter body 122.
  • a first decompression groove 133 is connected to one end of the first connection groove 132 (the side where the water intake through hole 152 is not disposed), and the second decompression groove is located near the center of the first connection groove 132. 134 is connected.
  • the first connection groove 132 has a zigzag plan view similar to a first decompression groove 133 and a second decompression groove 134, which will be described later, in a part of the region, and is also formed to function as a decompression groove. .
  • the first connection channel 141 is formed by the first connection groove 132 and the inner wall surface of the tube 110.
  • the irrigation liquid taken in from the water intake 131 flows through the first connection channel 141 to the first decompression channel 142 and the second decompression channel 144.
  • the first pressure reducing groove 133 (first pressure reducing flow path 142) is disposed in the first flow path 143 upstream of the flow rate reducing unit 136, and the flow rate decreases with the first connection groove 132 (first connection flow path 141).
  • the unit 136 is connected.
  • the first depressurization groove 133 (first depressurization flow path 142) reduces the pressure of the irrigation liquid taken from the water intake unit 131 and guides it to the flow rate reduction unit 136.
  • the first decompression groove 133 is disposed along the major axis direction at the outer edge portion on the second surface 120b side.
  • the upstream end of the first pressure reducing groove 133 is connected to the first connecting groove 132, and the flow rate reducing through-hole 161 communicating with the flow rate reducing unit 136 is disposed at the downstream end.
  • the shape of the first decompression groove 133 is not particularly limited as long as the above-described function can be exhibited.
  • the plan view shape of the first decompression groove 133 is a zigzag shape.
  • convex portions 162 having a substantially triangular prism shape protruding from the inner surface are alternately arranged along the direction in which the irrigation liquid flows.
  • the convex portion 162 is arranged so that the tip does not exceed the central axis of the first decompression groove 133 when viewed in plan.
  • the first decompression channel 142 is formed by the first decompression groove 133 and the inner wall surface of the tube 110.
  • the irrigation liquid taken in from the water intake unit 131 at least a part of the irrigation liquid is decompressed by the first decompression flow path 142 and guided to the flow rate reduction unit 136.
  • the second depressurization groove 134 (second depressurization flow path 144) is disposed in the second flow path 146 upstream of the flow path opening / closing part 137, and flows with the first connection groove 132 (first connection flow path 141).
  • the road opening / closing part 137 is connected.
  • the second decompression groove 134 (second decompression channel 144) guides the irrigation liquid taken from the water intake unit 131 to the channel opening / closing unit 137.
  • the upstream end of the second decompression groove 134 is connected to the connection groove 132, and a flow passage opening / closing through hole 163 communicating with the flow passage opening / closing portion 137 is formed at the downstream end.
  • the second decompression groove 134 has a zigzag planar view similar to the first decompression groove 133 in a part of the region, and is formed so as to function as a decompression groove.
  • the second decompression channel 144 is formed by the second decompression groove 134 and a part of the inner wall surface of the tube 110.
  • a part of the irrigation liquid passes through the second decompression channel 144 and is guided to the channel opening / closing unit 137.
  • the flow rate reduction unit 136 is disposed in the first channel 143 between the first decompression channel 142 (first decompression groove 133) and the discharge unit 138, and on the first surface 120a side of the emitter body 122. Has been placed.
  • the flow rate reduction unit 136 sends the irrigation liquid to the discharge unit 138 while reducing the flow rate of the irrigation liquid according to the pressure of the irrigation liquid in the tube 110.
  • the configuration of the flow rate reduction unit 136 is not particularly limited as long as the above-described function can be exhibited.
  • the flow rate reducing portion 136 includes a flow rate reducing through hole 161 communicated with the first pressure reducing groove 133 (first pressure reducing flow path 142), a flow rate reducing recess portion 171, a first valve seat portion 172, a communication groove 173, A discharge through-hole 174 communicating with the discharge unit 138, a first diaphragm 175 that is a part of the film 124, a first connection hole 176 communicating with the second connection groove 135 (second connection channel 145), Have
  • the plan view shape of the flow rate reducing recess 171 is substantially circular. On the bottom surface of the flow rate reducing recess 171, a flow rate reducing through hole 161, a discharge through hole 174, a first connection hole 176, and a first valve seat portion 172 are arranged.
  • the depth of the flow rate reducing recess 171 is not particularly limited as long as it is equal to or greater than the depth of the communication groove 173.
  • the discharge through-hole 174 is disposed in the central portion of the bottom surface of the flow rate reducing recess 171 and communicates with the discharge portion 138.
  • the first valve seat 172 is disposed on the bottom surface of the flow rate reducing recess 171 so as to surround the discharge through hole 174.
  • the first valve seat portion 172 is formed so that the first diaphragm portion 175 can be in close contact when the pressure of the irrigation liquid flowing through the tube 110 is high.
  • the flow rate of the irrigation liquid flowing from the flow rate reducing recess portion 171 into the discharge portion 138 is reduced.
  • the shape of the 1st valve seat part 172 will not be specifically limited if the above-mentioned function can be exhibited, For example, it can be set as an annular
  • the shape of the first valve seat portion 172 can be a shape in which the valve seat surface is inclined from the opening portion of the discharge through hole 174 toward the bottom surface of the flow rate reducing recess portion 171. .
  • a communication groove 173 that connects the inside of the flow rate reducing recess 171 and the discharge through-hole 174 is formed in a part of the region where the first diaphragm portion 175 of the first valve seat portion 172 can be in close contact.
  • the flow rate reducing through hole 161 connected to the first pressure reducing groove 133 (first pressure reducing channel 142) and the first connection hole 176 communicating with the second connection groove 135 (second connecting channel 145) are used for reducing the flow rate.
  • the bottom surface of the recess 171 is formed in a region where the first valve seat 172 is not disposed.
  • the first diaphragm portion 175 is a part of the film 124.
  • the first diaphragm portion 175 is arranged so as to partition the inside of the flow rate reducing recess 171 and the inside of the tube 110, and covers the upper surface of the flow rate reducing recess 171.
  • a part of the flow path wall in the flow rate reducing portion 136 is formed.
  • the first diaphragm portion 175 is deformed so as to contact the first valve seat portion 172 in accordance with the pressure of the irrigation liquid in the tube 110.
  • the first diaphragm portion 175 deforms toward the first valve seat portion 172 as the pressure of the irrigation liquid increases, and eventually comes into contact with the first valve seat portion 172. Even if the first diaphragm portion 175 is in close contact with the first valve seat portion 172, the first diaphragm portion 175 does not block the flow rate reducing through hole 161, the discharge through hole 174, and the communication groove 173.
  • the irrigation liquid sent from the flow rate reducing through-hole 161 can be sent to the discharge section 138 through the communication groove 173 and the discharge through-hole 174.
  • the first diaphragm portion 175 is disposed adjacent to a second diaphragm portion 183 described later.
  • the channel opening / closing part 137 is disposed in the second channel 146 between the second decompression channel 144 (second decompression groove 134) and the second connection groove 135 (second connection channel 145),
  • the emitter body 122 is disposed on the first surface 120a side.
  • the channel opening / closing unit 137 opens the second channel 146 according to the pressure in the tube 110 and sends the irrigation liquid to the discharge unit 138.
  • the downstream of the channel opening / closing unit 137 is connected to the flow rate reducing unit 136 through the second connection groove 135 (second connection channel 145), and the irrigation liquid from the second decompression channel 144 (second decompression groove 134). Reaches the discharge part 138 through the second connection groove 135 (second connection flow path 145) and the flow rate reduction part 136.
  • the channel opening / closing part 137 includes a channel opening / closing through hole 163 communicating with the second decompression channel 144 (second decompression groove 134), a channel opening / closing recess 181, a second valve seat 182, and a film 124. 2nd diaphragm part 183 and 2nd connection hole 184 connected to the 2nd connection slot 135 (2nd connection channel 145).
  • the plan view shape of the channel opening / closing recess 181 is substantially circular. On the bottom surface of the channel opening / closing recess 181, there are a channel opening / closing through hole 163, a second valve seat portion 182, and a second connection hole 184 communicating with the second connection groove 135 (flow rate reducing portion 136). Has been placed.
  • the bottom surface of the channel opening / closing recess 181 is disposed closer to the first surface 120 a than the bottom surface of the flow rate reducing recess 171. That is, the channel opening / closing recess 181 is formed shallower than the flow rate reducing recess 171.
  • the top portion of the second valve seat portion 182 is disposed on the first surface 120 a side from the top portion of the first valve seat portion 172.
  • the planar shape of the channel opening / closing recess 181 may be the same size and the same shape as the flow rate reducing recess 171 or may be smaller than the flow rate reducing recess 171.
  • the flow rate reducing recess 171 and the flow path opening / closing recess 181 are arranged side by side in the major axis direction of the emitter body 122.
  • the irrigation liquid that has flowed from the second decompression flow path 144 through the flow path opening / closing through-hole 163 into the flow path opening / closing recess 181 has the second connection hole 184, the second connection flow path 145, and the first connection hole 176. To flow into the flow rate reduction unit 136.
  • the passage opening / closing through-hole 163 communicating with the second decompression groove 134 is formed on the bottom surface of the passage opening / closing recess 181 in a region where the second valve seat portion 182 is not disposed.
  • a second opening / closing through-hole 163 communicating with the second decompression groove 134 is disposed so as to be surrounded by the second valve seat portion 182, and a second communicating with the second connection groove 135 (second connection channel 145).
  • the connection hole 184 may be disposed outside the second valve seat portion 182.
  • the second valve seat 182 is disposed on the bottom surface of the channel opening / closing recess 181 so as to surround the second connection hole 184. Further, the second valve seat portion 182 faces the second diaphragm portion 183 and is disposed in a non-contact manner.
  • the film 124 is deformed by the pressure of the irrigation liquid flowing through the tube 110, the second diaphragm portion 183 is in close contact with the second valve seat portion 182. It is formed to be able to. At this time, the second diaphragm portion 183 is in close contact with the second valve seat portion 182 to close the flow passage opening / closing through hole 163, and as a result, closes the second flow passage 146.
  • the shape of the 2nd valve seat part 182 will not be specifically limited if the above-mentioned function can be exhibited.
  • the second valve seat 182 is a part of the bottom surface of the channel opening / closing recess 181 provided with the channel opening / closing through hole 163.
  • the second valve seat portion 182 may be an annular convex portion disposed so as to surround the second connection hole 184.
  • the second diaphragm portion 183 is a part of the film 124 and is disposed adjacent to the first diaphragm portion 175.
  • the second diaphragm portion 183 is arranged so as to partition the inside of the channel opening / closing recess 181 and the inside of the tube 110, and the upper surface of the channel opening / closing recess 181 is formed.
  • a part of the flow path wall in the flow rate reducing portion 136 is covered.
  • the second diaphragm portion 183 is deformed so as to contact the second valve seat portion 182 according to the pressure of the irrigation liquid in the tube 110.
  • the second diaphragm portion 183 deforms toward the second valve seat portion 182 and contacts the second valve seat portion 182 as the pressure of the irrigation liquid increases. Thereby, the 2nd flow path 146 (2nd connection hole 184) is obstruct
  • the discharge unit 138 is disposed on the second surface 120b side of the emitter body 122.
  • the discharge unit 138 sends the irrigation liquid from the discharge through-hole 174 to the discharge port 112 of the tube 110.
  • the configuration of the discharge unit 138 is not particularly limited as long as the above function can be exhibited.
  • the discharge unit 138 includes a discharge recess 191 and an intrusion prevention unit 192.
  • the discharge recess 191 is disposed on the second surface 120 b side of the emitter body 122.
  • the shape of the discharge recess 191 in plan view is substantially rectangular.
  • a discharge through hole 174 and an intrusion prevention portion 192 are disposed on the bottom surface of the discharge recess 191.
  • the intrusion prevention unit 192 prevents intrusion of foreign matter from the discharge port 112.
  • the intrusion prevention unit 192 is not particularly limited as long as it can exhibit the above-described function.
  • the intrusion prevention unit 192 has a plurality of ridges 193 arranged adjacent to each other. The plurality of ridges 193 are disposed so as to be positioned between the discharge through hole 174 and the discharge port 112 when the emitter body 122 (emitter 120) is joined to the tube 110.
  • the film 124 includes a first diaphragm portion 175 and a second diaphragm portion 183, and constitutes the upper surface (flow channel wall) of the flow rate reducing portion 136 and the flow channel opening / closing portion 137 when joined to the emitter body 122.
  • the thickness of the film 124 is 0.3 mm, for example.
  • the hinge portion 126 is connected to a part of the first surface 120 a of the emitter body 122.
  • the hinge portion 126 has the same thickness as the film 124 and is formed integrally with the emitter body 122 and the film 124.
  • the film 124 may be prepared as a separate body from the emitter body 122 and bonded to the emitter body 122.
  • irrigation liquid is fed into the tube 110.
  • irrigation liquids include water, liquid fertilizers, pesticides and mixtures thereof.
  • the pressure of the irrigation liquid fed to the drip irrigation tube 100 is preferably 0.1 MPa or less so that the drip irrigation method can be easily introduced and the tube 110 and the emitter 120 are prevented from being damaged.
  • the irrigation liquid in the tube 110 is taken into the emitter 120 from the water intake 131. Specifically, the irrigation liquid in the tube 110 enters the water intake recess 153 through the gap between the first ridges 155 and passes through the water intake through hole 152.
  • the water intake part 131 has the screen part 151 (gap between the 1st protruding item
  • the irrigation liquid taken in from the water intake unit 131 reaches the first connection channel 141.
  • the irrigation liquid that has reached the first connection channel 141 flows into the first decompression channel 142 and the second decompression channel 144.
  • the irrigation liquid that has flowed into the first decompression flow path 142 reaches the flow rate reduction unit 136 through the flow rate reduction through hole 161.
  • the irrigation liquid that has flowed into the flow rate reduction unit 136 flows into the discharge unit 138.
  • the irrigation liquid that has flowed into the discharge unit 138 is discharged from the discharge port 112 of the tube 110 to the outside of the tube 110.
  • the irrigation liquid that has flowed into the second decompression channel 144 flows into the channel opening / closing part 137 through the channel opening / closing through hole 163.
  • the irrigation liquid that has flowed into the flow path opening / closing unit 137 flows into the discharge unit 138 through the flow rate reducing unit 136.
  • the irrigation liquid that has flowed into the discharge unit 138 is discharged from the discharge port 112 of the tube 110 to the outside of the tube 110.
  • the flow rate reducing unit 136 and the flow path opening / closing unit 137 communicate with each other. Further, in the flow rate reduction unit 136, the flow rate of the irrigation liquid is controlled by the first diaphragm unit 175 according to the pressure of the irrigation liquid in the tube 110, and in the flow path opening / closing unit 137, the irrigation liquid in the tube 110 is controlled. The flow rate of the irrigation liquid is controlled by the second diaphragm unit 183 in accordance with the pressure. Therefore, the operation of the flow path opening / closing unit 137 and the flow rate reducing unit 136 according to the pressure of the irrigation liquid in the tube 110 will be described.
  • the first diaphragm portion 175 and the second diaphragm portion 183 are not deformed.
  • the irrigation liquid When the pressure of the irrigation liquid is low, the irrigation liquid is discharged out of the tube through both the first flow path 143 and the second flow path 146. As the pressure of the irrigation liquid increases, the first diaphragm portion 175 deforms toward the first valve seat portion 172 and the second diaphragm portion 183 deforms toward the second valve seat portion 182. When the pressure of the irrigation liquid increases, the second diaphragm portion 183 comes into contact with the second valve seat portion 182 and the second flow path 146 is closed. When the second flow path 146 is closed, the irrigation liquid is discharged only through the first flow path 143.
  • the flow rate of the irrigation liquid from the flow rate reduction unit 136 is controlled to a flow rate according to the passage amount of the first flow path 143, and from the discharge port, the first flow rate is increased. Only the irrigation liquid having a flow rate corresponding to the passage amount of the flow path 143 is discharged.
  • the first diaphragm portion 175 When the pressure of the irrigation liquid in the tube is further increased, the first diaphragm portion 175 is further deformed toward the first valve seat portion 172 and eventually comes into close contact with the valve seat surface of the first valve seat portion 172. In the emitter 120, since the valve seat surface of the first valve seat portion 172 is inclined downward toward the outer edge, the first diaphragm portion 175 has the valve seat as the pressure of the irrigation liquid increases.
  • the flow path formed by the communication groove 173 and the first diaphragm portion 175 is gradually lengthened, and the opening on the outer edge side is gradually narrowed.
  • the flow rate of the irrigation liquid from the flow rate reduction unit 136 is controlled to a flow rate according to the opening area of the flow path, and finally from the discharge port, Only irrigation liquid with a flow rate corresponding to the opening area is discharged.
  • the emitter 120 increases the flow rate of the irrigation liquid due to the pressure of the irrigation liquid, and blocks the second flow path 146 and decreases the opening area of the flow path in the first flow path 143. Since the decrease in the flow rate is offset, the amount of the irrigation liquid discharged from the discharge port does not increase even when the pressure of the irrigation liquid increases. Therefore, the drip irrigation tube 100 can discharge a certain amount of irrigation liquid out of the tube 110 regardless of whether the pressure of the irrigation liquid is low or high.
  • the emitter body 122 insert-molds and injects an intermediate molded body 222 having substantially the same shape as the emitter body 122. It is manufactured by using a mold by a method such as molding and compression molding, and then plastically deforming the intermediate molded body 222 into the shape of the emitter body 122 by secondary processing.
  • the intermediate molded body 222 has provisional ridges 255 that are higher than the first ridges 155 in height from the bottom surface of the water intake depressions 153 at each position where the first ridges 155 are disposed.
  • the temporary convex stripe 255 does not have an overhanging portion that becomes an undercut.
  • line 255 does not become an undercut which requires unreasonable extraction, the mold release by extraction from a metal mold
  • the provisional ridge 255 has a width in the height direction (thickness direction of the intermediate molded body 222) (a width from the second surface 120b side to the first surface 120a side when the emitter body 122 is secondarily processed). You may form so that it may have the substantially rectangular parallelepiped area
  • the provisional ridge 255 has at least a part in the height direction in a width reduction region in which the width on the first surface 120a side becomes narrower than the second surface 120b side when the emitter body 122 is secondarily processed. You may form so that it may have. That is, the provisional ridge 255 has the first surface at any two points when the width in the major axis direction of the intermediate formed body 222 (same as the major axis direction of the emitter 120) is measured at two arbitrary points. The width on the 120a side and the width on the second surface 120b side may be the same, or the first surface 120a side may be formed to be narrower than the second surface 120b side.
  • the provisional protrusion 255 is formed so that the width on the first surface 120a side is narrower than that on the second surface 120b side from the viewpoint of easier release from the mold. It is preferable that there is no widened region in the height direction in which the width on the first surface 120a side is wider than the second surface 120b side when the emitter body 122 is secondarily processed.
  • region by the side of the bottom face of the recessed part 153 for water intake among the temporary convex stripes 255 is hard to deform
  • the intermediate molded body 222 is preferably molded integrally with the hinge portion 126 and the film 124.
  • the intermediate molded body 222 having the provisional ridge 255 is then plastically deformed into the shape of the emitter body 122 by secondary processing. Specifically, the intermediate protrusion 222 is plastically deformed into the shape of the emitter body 122 by plastically deforming the temporary protrusion 255 to form the first protrusion 155 constituting the wedge wire structure.
  • the plastic deformation is such that the width of the first ridge 155 at the top of the emitter body 122 on the first surface 120a side is larger than the width of the first ridge 155 at an arbitrary height on the second surface 120b side.
  • the plastic deformation can be performed by a method such as hot plate pressing, physical compression and ultrasonic pressing. Among these methods, a hot plate press is preferable because the plastic deformation of the top of the provisional ridge 255 can be performed inexpensively and effectively.
  • the emitter 120 is then configured by rotating the film 124 about the hinge 126 and joining the film 124 to the first surface 120a of the emitter body 122.
  • the joining method of the emitter body 122 and the film 124 is not particularly limited. Examples of the method for joining the emitter body 122 and the film 124 include welding of a resin material constituting the film 124 and adhesion with an adhesive.
  • the hinge portion 126 may be cut after the emitter body 122 and the film 124 are joined.
  • the film 124 may be prepared as a separate body from the emitter body 122 and bonded to the emitter body 122.
  • line 155 can be adjusted more easily by changing the height of the temporary protruding item
  • the width at the top of the first ridge 155 and an arbitrary height on the second surface 120b side are suppressed while suppressing the breakage and deformation of the first ridge 155 at the time of manufacture. It is also easy to increase the ratio of the width at. Therefore, according to the manufacturing method described above, it is possible to manufacture an emitter in which suspended matter in the irrigation liquid is less likely to enter the inside and the pressure loss of water that has entered the intake portion 131 is less.
  • the intermediate formed body 222 has a cut portion 257 provided with a cut in a direction substantially orthogonal to the arrangement direction of the plurality of temporary convex stripes 255 when viewed from the top at the top of the temporary convex stripes 255. You may have.
  • the provisional ridge 255 having the cut portion 257 opens in the direction of the temporary ridge 255 adjacent from the cut portion 257 at the time of plastic deformation (particularly during physical compression), so the shape of the wedge wire structure is easier. Can be produced.
  • the intermediate molded body 222 is plastically deformed into the shape of the emitter body 122 and then the film 124 is bonded to the first surface 120a of the emitter body 122.
  • the plastic deformation of the intermediate molded body 222 and the bonding of the film 124 are performed. May be performed as the same process. That is, at the time of heating for welding the resin material constituting the film 124 or bonding with an adhesive, it is possible to simultaneously hot plate press the provisional ridge 255 and plastically deform it into the shape of the first ridge 155. is there. Therefore, according to this modification, the emitter manufacturing process can be shortened, and the emitter can be efficiently manufactured in a shorter time.
  • the shape of the emitter 120 is not limited to the above description, and the present invention is applicable to any shape of the emitter 120 having the first protrusion 155 constituting the wedge wire structure in the water intake portion 131. Is possible.
  • the second ridge 156 constitutes a wedge wire structure
  • an intermediate molded body having temporary ridges is formed at each position where the second ridge 156 of the emitter body 122 is disposed, and the temporary protrusion is formed.
  • the strip may be plastically deformed to form the second ridge 156.
  • the screen portion having the wedge wire structure is not easily damaged, and the design of the wedge wire structure at the time of manufacturing the emitter is increased. It is possible to manufacture an emitter in which the amount of dripping is not likely to change unintentionally and the pressure loss of water entering the inside of the water intake portion is less because it is less likely to enter the inside. Therefore, according to the present invention, it is expected that the emitter will be spread to a technical field that requires long-term dripping, and further development of the technical field will be expected.
  • Tube for drip irrigation 110
  • Tube 112 Discharge port 120
  • Emitter 120a First surface 120b Second surface 122
  • Emitter body 124
  • Film 126 Hinge portion 131
  • Water intake portion 132
  • First connection groove 133
  • First pressure reduction groove 134
  • Second pressure reduction groove 135
  • Second connection Groove 136
  • Flow reduction part 137
  • First connection flow path 142
  • First pressure reduction flow path 143
  • First flow path 144
  • Second pressure reduction flow path 145
  • Second connection flow path 146
  • Screen part 152
  • Water intake through-hole 153
  • Water intake recess 154
  • Projection 155
  • First projecting strip 156
  • Second projecting strip 161
  • Flow reduction through-hole 162 Projection 163
  • First valve seat 173 Communication groove 174
  • First diaphragm portion 176

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  • Engineering & Computer Science (AREA)
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Abstract

The purpose of the present invention is to provide a manufacturing method for an emitter that has a plurality of ridges constituting a wedge wire structure, the method making it possible to manufacture the plurality of ridges without forcibly pulling out the ridges. The foregoing is achieved by a manufacturing method for an emitter that includes a water intake part for taking in an irrigation liquid, a discharge part capable of discharging the irrigation liquid, and a flow path connecting the water intake part and the discharge part and circulating the irrigation liquid, the water intake part having a screen part with a wedge wire structure in which a plurality of ridges are arranged. The manufacturing method comprises: a step for fabricating an intermediate molded body of the emitter, the intermediate molded body having a plurality of temporary ridges that are higher than the ridges to be formed and that are in the respective positions where the ridges to be formed will be disposed; and a step for forming the plurality of ridges by plastic deformation of the plurality of temporary ridges.

Description

エミッタの製造方法Emitter manufacturing method
　本発明は、エミッタの製造方法に関する。 The present invention relates to a method for manufacturing an emitter.
　以前から、植物の栽培方法の一つとして点滴灌漑法が知られている。点滴灌漑法とは、植物が植えられている土壌上に点滴灌漑用チューブを配置し、点滴灌漑用チューブから土壌へ、水や液体肥料などの灌漑用液体を滴下する方法である。近年、点滴灌漑法は、灌漑用液体の消費量を最小限にすることが可能であるため、特に注目されている。 For some time, drip irrigation has been known as one of the plant cultivation methods. The drip irrigation method is a method in which a drip irrigation tube is arranged on the soil in which plants are planted, and irrigation liquid such as water or liquid fertilizer is dropped from the drip irrigation tube to the soil. In recent years, drip irrigation has attracted particular attention because it can minimize the consumption of irrigation liquid.
　点滴灌漑用チューブは、通常、灌漑用液体が吐出される複数の貫通孔が形成されたチューブと、各貫通孔から灌漑用液体を吐出するための複数のエミッタ（「ドリッパ」ともいう）を有する。また、エミッタの種類としては、チューブの内壁面に接合して使用されるエミッタ（例えば、特許文献１参照）と、チューブに外側から突き刺して使用されるエミッタとが知られている。 A drip irrigation tube usually has a tube formed with a plurality of through holes through which irrigation liquid is discharged, and a plurality of emitters (also referred to as “drippers”) for discharging the irrigation liquid from each through hole. . As types of emitters, there are known an emitter that is used while being joined to the inner wall surface of the tube (see, for example, Patent Document 1), and an emitter that is used by piercing the tube from the outside.
　特許文献１には、チューブの内壁面に接合されるエミッタが記載されている。特許文献１に記載のエミッタは、灌漑用液体を取り入れるための取水部と、チューブを貫通する吐出口に面して配置された、灌漑用液体を吐出するための吐出部と、取水部と吐出部とを繋いで灌漑用液体を流通させる流路と、を有する。また、特許文献１に記載のエミッタは、取水部に、複数の凸条が配列されたウェッジワイヤー構造を有するスクリーン部となっている。上記ウェッジワイヤー構造を有するスクリーン部は、浮遊物が流路内に侵入することを防止し、かつ、凸条間に入り込んだ水の圧力損失を抑制できる。 Patent Document 1 describes an emitter bonded to the inner wall surface of a tube. The emitter described in Patent Document 1 includes a water intake portion for taking in irrigation liquid, a discharge portion for discharging irrigation liquid, which faces the discharge port penetrating the tube, and the water intake portion and discharge And a flow path through which the irrigation liquid is distributed. Moreover, the emitter described in Patent Document 1 is a screen portion having a wedge wire structure in which a plurality of ridges are arranged in a water intake portion. The screen part which has the said wedge wire structure can prevent that a suspended | floating matter penetrate | invades in a flow path, and can suppress the pressure loss of the water which entered between the protruding ridges.
　また、特許文献１には、上記エミッタは射出成形などによって製造できると記載されている。 Patent Document 1 describes that the emitter can be manufactured by injection molding or the like.
特開２０１６－１５４５２５号公報JP 2016-154525 A
　特許文献１に記載のエミッタが有するような、ウェッジワイヤー構造を構成する複数の凸条は、成形時のアンダーカットとなる。 The plurality of ridges constituting the wedge wire structure as the emitter described in Patent Document 1 has an undercut at the time of molding.
　通常、アンダーカットは、金型を内側または外側にスライドさせて金型から離型される。しかし、上記複数の凸条は、取水部を構成する凹部の中に狭い間隔で隣接して配置されるため、金型をスライドさせるための空間を確保することができず、上記通常のアンダーカット処理では金型から離型させることができない。 Normally, the undercut is released from the mold by sliding the mold inward or outward. However, since the plurality of ridges are arranged adjacent to each other at a narrow interval in the concave portion constituting the water intake portion, a space for sliding the mold cannot be secured, and the normal undercut is performed. The treatment cannot be released from the mold.
　そのため、上記複数の凸条は、成形体（エミッタ）を変形させつつ金型を凸条の高さ方向に引き抜く、いわゆる無理抜きで金型から離型されている。特許文献１に記載のようなエミッタは、可撓性を有する材料を材料としているため、無理抜きでの離型が可能であり、また無理抜き後にも元の形状に戻りやすい。しかし、このような材料を用いてエミッタを製造しても、無理抜き時の凸条の変形および破損などは生じ得る。 Therefore, the plurality of ridges are released from the mold by so-called unreasonable pulling, by pulling the mold in the height direction of the ridge while deforming the molded body (emitter). Since the emitter as described in Patent Document 1 is made of a flexible material, it can be released without force, and easily returns to its original shape even after force removal. However, even when an emitter is manufactured using such a material, deformation or breakage of the ridge when forcibly removed can occur.
　そこで、本発明の目的は、ウェッジワイヤー構造を構成する複数の凸条を有するエミッタの製造方法であって、無理抜きをせずに上記複数の凸条を製造可能な方法を提供することである。 Therefore, an object of the present invention is to provide a method of manufacturing an emitter having a plurality of ridges constituting a wedge wire structure, and capable of manufacturing the plurality of ridges without forcibly removing them. .
　上記の課題を解決するため、本発明に係るエミッタの製造方法は、灌漑用液体を流通させるチューブの内壁面であり、かつ前記チューブの内外を連通する吐出口に対応する位置に接合され、前記チューブ内の前記灌漑用液体を前記吐出口から定量的に前記チューブ外に吐出するためのエミッタの製造方法である。前記エミッタは、互いに裏表の関係にある第１表面および第２表面を有するエミッタ本体の、前記第１表面側に設けられた、前記灌漑用液体を取り入れるための取水部と、前記エミッタ本体の前記第２表面側に設けられた、前記吐出口に面して配置されたときに前記灌漑用液体を前記チューブの外部に吐出可能な吐出部と、前記取水部および前記吐出部を繋ぎ、前記灌漑用液体を流通させる流路と、を有し、前記取水部は、前記第１表面側において前記第２表面側よりも幅が広くなるように形成された複数の凸条が配列されたスクリーン部を有する。前記製造方法は、前記エミッタが有する前記凸条よりも高さが高い複数の仮凸条を、前記取水部の前記凸条が配置されるそれぞれの位置に有する、前記エミッタの中間成形体を作製する工程と、前記複数の仮凸条を塑性変形させて前記複数の凸条を形成する工程と、を含む。 In order to solve the above-described problems, an emitter manufacturing method according to the present invention is an inner wall surface of a tube through which an irrigation liquid is circulated, and is joined to a position corresponding to a discharge port communicating between the inside and the outside of the tube, An emitter manufacturing method for quantitatively discharging the irrigation liquid in a tube from the discharge port to the outside of the tube. The emitter is provided on the first surface side of an emitter body having a first surface and a second surface that are in a reverse relation to each other, and a water intake portion for taking in the irrigation liquid, and the emitter body A irrigation unit, which is provided on the second surface side, connects the discharge unit that can discharge the irrigation liquid to the outside of the tube when arranged facing the discharge port, and the water intake unit and the discharge unit. And a flow channel through which the liquid for use flows, and the water intake portion has a plurality of ridges arranged on the first surface side so as to be wider than the second surface side. Have The manufacturing method produces an intermediate molded body of the emitter having a plurality of temporary ridges having a height higher than the ridges of the emitter at respective positions where the ridges of the water intake portion are arranged. And a step of plastically deforming the plurality of provisional ridges to form the plurality of ridges.
　本発明に係るエミッタの製造方法は、ウェッジワイヤー構造を構成する複数の凸条を有するエミッタを、上記複数の凸条の無理抜きをせずに製造可能である。 The emitter manufacturing method according to the present invention can manufacture an emitter having a plurality of ridges constituting a wedge wire structure without forcibly removing the plurality of ridges.
図１Ａ、Ｂは、本発明によって製造されるエミッタが配置された点滴灌漑用チューブの断面図である。1A and 1B are cross-sectional views of a drip irrigation tube having an emitter manufactured according to the present invention. 図２Ａ、Ｂは、本発明によって製造されるエミッタの構成を示す図である。2A and 2B are diagrams showing the configuration of an emitter manufactured according to the present invention. 図３Ａ～Ｃは、本発明によって製造されるエミッタの構成を示す図である。3A to 3C are diagrams showing the configuration of an emitter manufactured according to the present invention. 図４Ａ、Ｂは、本発明によって製造されるエミッタの構成を示す図である。4A and 4B are diagrams showing the configuration of an emitter manufactured according to the present invention. 図５は、図３Ｃに示される円部Ｄの拡大断面図である。FIG. 5 is an enlarged cross-sectional view of the circular portion D shown in FIG. 3C. 図６は、本発明の実施の形態に係るエミッタの製造方法を説明するための模式図である。FIG. 6 is a schematic diagram for explaining a method for manufacturing an emitter according to an embodiment of the present invention. 図７は、本発明の実施の一形態に係るエミッタの製造方法を説明するための拡大模式図である。FIG. 7 is an enlarged schematic view for explaining a method for manufacturing an emitter according to an embodiment of the present invention. 図８は、本発明の別の実施の形態に係るエミッタの製造方法を説明するための拡大模式図である。FIG. 8 is an enlarged schematic view for explaining a method for manufacturing an emitter according to another embodiment of the present invention.
　以下、本発明によって製造されるエミッタおよび当該エミッタが配置された点滴灌漑用チューブの一例を説明し、その後、当該エミッタの製造方法を説明する。 Hereinafter, an example of an emitter manufactured according to the present invention and a drip irrigation tube in which the emitter is arranged will be described, and then a method of manufacturing the emitter will be described.
　（エミッタおよび点滴灌漑用チューブの例示的な構成）
　図１Ａは、本発明によって製造されるエミッタ１２０を有する点滴灌漑用チューブ１００の軸に沿う方向における断面図であり、図１Ｂは、点滴灌漑用チューブ１００の軸に垂直な方向における断面図である。 (Example configuration of emitter and drip irrigation tubes)
1A is a cross-sectional view in a direction along the axis of a drip irrigation tube 100 having an emitter 120 manufactured according to the present invention, and FIG. 1B is a cross-sectional view in a direction perpendicular to the axis of the drip irrigation tube 100. .
　図１に示されるように、点滴灌漑用チューブ１００は、チューブ１１０およびエミッタ１２０を有する。 As shown in FIG. 1, the drip irrigation tube 100 has a tube 110 and an emitter 120.
　チューブ１１０は、灌漑用液体を流すための管である。チューブ１１０の材料は、特に限定されず、たとえば、ポリエチレンとすることができる。チューブ１１０の管壁には、チューブ１１０の軸方向において所定の間隔（例えば、２００～５００ｍｍ）で灌漑用液体を吐出するための複数の吐出口１１２が形成されている。吐出口１１２の開口部の直径は、灌漑用液体を吐出することができれば特に限定されず、たとえば、１．５ｍｍとすることができる。チューブ１１０の内壁面の吐出口１１２に対応する位置には、エミッタ１２０がそれぞれ接合される。チューブ１１０の軸方向に垂直な断面形状および断面積は、チューブ１１０の内部にエミッタ１２０を配置することができれば特に限定されない。 The tube 110 is a tube for flowing irrigation liquid. The material of the tube 110 is not specifically limited, For example, it can be set as polyethylene. A plurality of discharge ports 112 for discharging irrigation liquid at predetermined intervals (for example, 200 to 500 mm) in the axial direction of the tube 110 are formed on the tube wall of the tube 110. The diameter of the opening of the discharge port 112 is not particularly limited as long as the irrigation liquid can be discharged, and can be 1.5 mm, for example. Emitters 120 are respectively joined to positions corresponding to the discharge ports 112 on the inner wall surface of the tube 110. The cross-sectional shape and cross-sectional area perpendicular to the axial direction of the tube 110 are not particularly limited as long as the emitter 120 can be disposed inside the tube 110.
　点滴灌漑用チューブ１００は、エミッタ１２０をチューブ１１０の内壁面に接合することによって作製される。チューブ１１０とエミッタ１２０との接合方法は、特に限定されない。チューブ１１０とエミッタ１２０との接合方法の例には、エミッタ１２０またはチューブ１１０を構成する樹脂材料の溶着や、接着剤による接着などが含まれる。なお、吐出口１１２は、通常、チューブ１１０とエミッタ１２０とを接合した後に形成されるが、接合前に形成されてもよい。 The drip irrigation tube 100 is manufactured by joining the emitter 120 to the inner wall surface of the tube 110. The method for joining the tube 110 and the emitter 120 is not particularly limited. Examples of the method for joining the tube 110 and the emitter 120 include welding of a resin material constituting the emitter 120 or the tube 110, adhesion by an adhesive, and the like. In addition, although the discharge port 112 is normally formed after joining the tube 110 and the emitter 120, it may be formed before joining.
　図２Ａは、エミッタ本体１２２とフィルム１２４とを接合する前のエミッタ１２０の平面図であり、図２Ｂは、エミッタ本体１２２とフィルム１２４とを接合する前のエミッタ１２０の底面図である。図３Ａは、エミッタ本体１２２とフィルム１２４とを接合する前のエミッタ１２０の正面図であり、図３Ｂは、図２Ａに示されるＡ－Ａ線の断面図であり、図３Ｃは、図２Ａに示されるＢ－Ｂ線の断面図である。図４Ａは、エミッタ本体１２２とフィルム１２４とを接合する前のエミッタ１２０の側面図であり、図４Ｂは、図２Ａに示されるＣ－Ｃ線のエミッタ本体１２２の断面図である。図５は、図３Ｃに示される円部Ｄの拡大断面図である。 2A is a plan view of the emitter 120 before the emitter body 122 and the film 124 are joined, and FIG. 2B is a bottom view of the emitter 120 before the emitter body 122 and the film 124 are joined. 3A is a front view of the emitter 120 before joining the emitter body 122 and the film 124, FIG. 3B is a cross-sectional view taken along the line AA shown in FIG. 2A, and FIG. 3C is a cross-sectional view of FIG. It is sectional drawing of the BB line shown. 4A is a side view of the emitter 120 before the emitter body 122 and the film 124 are joined, and FIG. 4B is a cross-sectional view of the emitter body 122 taken along the line CC shown in FIG. 2A. FIG. 5 is an enlarged cross-sectional view of the circular portion D shown in FIG. 3C.
　図１～図４に示されるように、エミッタ１２０は、吐出口１１２を覆うようにチューブ１１０の内壁面に接合される。エミッタ１２０の形状は、チューブ１１０の内壁面に密着して、吐出口１１２を覆うことができれば特に限定されない。本実施の形態では、チューブ１１０の軸方向に垂直なエミッタ１２０の断面における、チューブ１１０の内壁面に接合する第２表面１２０ｂの形状は、チューブ１１０の内壁面に沿うように、チューブ１１０の内壁面に向かって凸の略円弧形状である。エミッタ１２０の平面形状は、四隅がＲ面取りされた略矩形である。エミッタ１２０の大きさは、特に限定されず、たとえば、エミッタ１２０の長辺方向の長さは２５ｍｍ、短辺方向の長さは８ｍｍ、高さは２．５ｍｍとすることができる。 1 to 4, the emitter 120 is joined to the inner wall surface of the tube 110 so as to cover the discharge port 112. The shape of the emitter 120 is not particularly limited as long as it can adhere to the inner wall surface of the tube 110 and cover the discharge port 112. In the present embodiment, the shape of the second surface 120b joined to the inner wall surface of the tube 110 in the cross section of the emitter 120 perpendicular to the axial direction of the tube 110 is such that the inner surface of the tube 110 is aligned with the inner wall surface of the tube 110. It has a substantially arc shape that is convex toward the wall surface. The planar shape of the emitter 120 is a substantially rectangular shape with four corners rounded. The size of the emitter 120 is not particularly limited. For example, the length of the emitter 120 in the long side direction can be 25 mm, the length in the short side direction can be 8 mm, and the height can be 2.5 mm.
　エミッタ１２０は、互いに裏表の関係にある第１表面１２０ａおよび第２表面１２０ｂを有し、前記第２表面１２０ｂがチューブ１１０の内壁面に接合されるエミッタ本体１２２と、エミッタ本体１２２に接合されたフィルム１２４とを有する。エミッタ本体１２２およびフィルム１２４は、ヒンジ部１２６を介して一体的に形成されている（図２Ａ、Ｂ参照）。 The emitter 120 has a first surface 120 a and a second surface 120 b that are in reverse relation to each other, and the second surface 120 b is joined to the inner wall surface of the tube 110, and the emitter body 122 is joined to the emitter body 122. And a film 124. The emitter body 122 and the film 124 are integrally formed via a hinge portion 126 (see FIGS. 2A and 2B).
　エミッタ本体１２２およびフィルム１２４は、いずれも可撓性を有する一種類の材料で成形されている。エミッタ本体１２２およびフィルム１２４の材料の例には、樹脂およびゴムが含まれる。樹脂の例には、ポリエチレンおよびシリコーンが含まれる。エミッタ本体１２２およびフィルム１２４の可撓性は、弾性を有する樹脂材料の使用によって調整することができる。エミッタ本体１２２およびフィルム１２４の可撓性の調整方法の例には、弾性を有する樹脂の選択や、硬質の樹脂材料に対する弾性を有する樹脂材料の混合比の調整などが含まれる。 Both the emitter main body 122 and the film 124 are formed of one kind of flexible material. Examples of the material of the emitter body 122 and the film 124 include resin and rubber. Examples of the resin include polyethylene and silicone. The flexibility of the emitter body 122 and the film 124 can be adjusted by using a resin material having elasticity. Examples of methods for adjusting the flexibility of the emitter body 122 and the film 124 include selection of a resin having elasticity, adjustment of a mixing ratio of a resin material having elasticity to a hard resin material, and the like.
　エミッタ本体１２２は、取水部１３１と、第１接続流路１４１となる第１接続溝１３２と、第１減圧流路１４２となる第１減圧溝１３３と、第２減圧流路１４４となる第２減圧溝１３４と、第２接続流路１４５となる第２接続溝１３５と、流量減少部１３６と、流路開閉部１３７と、吐出部１３８と、を有する。取水部１３１、流量減少部１３６および流路開閉部１３７は、エミッタ本体１２２の第１表面１２０ａ側に配置されている。また、第１接続溝１３２、第１減圧溝１３３、第２減圧溝１３４、吐出部１３８および第２接続溝１３５は、エミッタ本体１２２の第２表面１２０ｂ側に配置されている。 The emitter body 122 includes a water intake 131, a first connection groove 132 that becomes the first connection flow path 141, a first pressure reduction groove 133 that becomes the first pressure reduction flow path 142, and a second pressure that becomes the second pressure reduction flow path 144. The decompression groove 134, the second connection groove 135 serving as the second connection flow path 145, the flow rate reduction unit 136, the flow path opening / closing unit 137, and the discharge unit 138 are provided. The water intake part 131, the flow rate reduction part 136, and the flow path opening / closing part 137 are disposed on the first surface 120 a side of the emitter body 122. In addition, the first connection groove 132, the first pressure reduction groove 133, the second pressure reduction groove 134, the discharge part 138, and the second connection groove 135 are disposed on the second surface 120 b side of the emitter body 122.
　フィルム１２４とエミッタ本体１２２とが接合され、かつ、エミッタ本体１２２とチューブ１１０とが接合されることにより、第１接続溝１３２、第１減圧溝１３３、第２減圧溝１３４および第２接続溝１３５は、それぞれ第１接続流路１４１、第１減圧流路１４２、第２減圧流路１４４および第２接続流路１４５となる。すなわち、取水部１３１、第１接続流路１４１、第１減圧流路１４２、流量減少部１３６および吐出部１３８から構成され、取水部１３１と吐出部１３８とを繋ぐ第１流路１４３が形成される。また、取水部１３１、第１接続流路１４１、第２減圧流路１４４、流路開閉部１３７、第２接続流路１４５、流量減少部１３６および吐出部１３８から構成され、取水部１３１と吐出部１３８とを繋ぐ第２流路１４６が形成される。第１流路１４３および第２流路１４６は、いずれも取水部１３１から吐出部１３８まで灌漑用液体を流通させる。またエミッタ本体１２２は、第２流路１４６の流路開閉部１３７の下流が流量減少部１３６に接続されており、流量減少部１３６から吐出部１３８までの間が、第１流路１４３と第２流路１４６とが重複している。 The film 124 and the emitter body 122 are joined together, and the emitter body 122 and the tube 110 are joined together, whereby the first connection groove 132, the first decompression groove 133, the second decompression groove 134, and the second connection groove 135 are joined. Are a first connection channel 141, a first decompression channel 142, a second decompression channel 144, and a second connection channel 145, respectively. In other words, the first intake passage 131, the first connection passage 141, the first decompression passage 142, the flow rate reduction portion 136, and the discharge portion 138 are formed, and the first passage 143 that connects the intake portion 131 and the discharge portion 138 is formed. The Further, the intake section 131, the first connection flow path 141, the second decompression flow path 144, the flow path opening / closing section 137, the second connection flow path 145, the flow rate reduction section 136, and the discharge section 138 are configured. A second flow path 146 that connects the portion 138 is formed. In each of the first flow path 143 and the second flow path 146, the irrigation liquid is circulated from the water intake section 131 to the discharge section 138. In addition, the emitter body 122 is connected to the flow rate reducing unit 136 downstream of the channel opening / closing unit 137 of the second channel 146, and between the flow rate reducing unit 136 and the discharge unit 138 is connected to the first channel 143 and the first channel 143. The two flow paths 146 overlap.
　取水部１３１は、エミッタ本体１２２の第１表面１２０ａ側の領域に配置されている（図２Ａ参照）。取水部１３１が配置されていない第１表面１２０ａの領域には、流量減少部１３６および流路開閉部１３７（フィルム１２４）が配置されている。取水部１３１は、スクリーン部１５１および複数の取水用貫通孔１５２を有する。 The water intake portion 131 is disposed in a region on the first surface 120a side of the emitter body 122 (see FIG. 2A). In the region of the first surface 120a where the water intake portion 131 is not disposed, a flow rate reducing portion 136 and a flow path opening / closing portion 137 (film 124) are disposed. The water intake portion 131 includes a screen portion 151 and a plurality of water intake through holes 152.
　スクリーン部１５１は、エミッタ本体１２２に第１表面１２０ａ側から取り入れられる灌漑用液体中の浮遊物が取水用凹部１５３内に侵入することを防止する。スクリーン部１５１は、チューブ１１０内に対して開口しており、取水用凹部１５３および凸条１５４を有する。 The screen 151 prevents the suspended matter in the irrigation liquid introduced into the emitter body 122 from the first surface 120a side from entering the water intake recess 153. The screen portion 151 is open to the inside of the tube 110 and has a water intake recess 153 and a ridge 154.
　取水用凹部１５３は、エミッタ本体１２２の第１表面１２０ａにおいて、フィルム１２４が接合されていない領域の全体に形成されている１つの凹部である。取水用凹部１５３の深さは特に限定されず、エミッタ本体１２２の大きさによって適宜設定される。取水用凹部１５３の底面上には凸条１５４が形成されている。また、取水用凹部１５３の底面には取水用貫通孔１５２が形成されている。 The water intake recess 153 is one recess formed in the entire region where the film 124 is not bonded on the first surface 120 a of the emitter body 122. The depth of the water intake recess 153 is not particularly limited, and is appropriately set depending on the size of the emitter body 122. On the bottom surface of the water intake recess 153, a protrusion 154 is formed. In addition, a water intake through hole 152 is formed on the bottom surface of the water intake recess 153.
　凸条１５４は、取水用凹部１５３の底面上に配置されている。凸条１５４の配置および数は、取水用凹部１５３の開口部側から灌漑用液体を取り入れつつ、灌漑用液体中の浮遊物の侵入を防止することができれば特に限定されない。凸条１５４は、エミッタ本体１２２の短軸方向に沿い、かつエミッタ本体１２２の長軸方向に配列された複数の第１凸条１５５と、エミッタ本体１２２の長軸方向に沿って配置された１つの第２凸条１５６とを有する。 The protrusion 154 is disposed on the bottom surface of the water intake recess 153. The arrangement and number of the ridges 154 are not particularly limited as long as the irrigation liquid can be taken in from the opening side of the water intake recess 153 and the intrusion of suspended matter in the irrigation liquid can be prevented. The ridges 154 are arranged along the minor axis direction of the emitter body 122 and a plurality of first ridges 155 arranged in the major axis direction of the emitter body 122, and 1 arranged along the major axis direction of the emitter body 122. Two second ridges 156.
　第１凸条１５５は、第１表面１２０ａ側において第２表面１２０ｂ側よりも幅が広くなるように形成されている（図５参照）。つまり、第１凸条１５５は、高さ方向（エミッタ本体１２２の厚み方向）に位置が異なる任意の２点においてエミッタ本体１２２の長軸方向の幅を測定したときに、第１表面１２０ａ側の点において第２表面１２０ｂ側の点よりも上記幅が広くなるような２点を有する。なお、第１凸条１５５は、その頂部において最も幅が広いことが好ましい。また、隣接する第１凸条１５５間の距離は、前述の機能を発揮することができれば特に限定されない。これにより、第１凸条１５５の配列方向において、隣接する第１凸条１５５間には、取水用凹部１５３の底面側に空間が生じ、複数の第１凸条１５５は、いわゆるウェッジワイヤー構造を構成する。そのため、第１凸条１５５は、取水用凹部１５３内に流入した水の圧力損失を抑制できる。 The first ridge 155 is formed so that the width on the first surface 120a side is wider than that on the second surface 120b side (see FIG. 5). That is, the first ridge 155 is formed on the first surface 120a side when the width in the major axis direction of the emitter body 122 is measured at any two points whose positions are different in the height direction (the thickness direction of the emitter body 122). The point has two points that are wider than the point on the second surface 120b side. In addition, it is preferable that the 1st protruding item | line 155 is the widest in the top part. Moreover, the distance between the adjacent 1st protruding item | lines 155 will not be specifically limited if the above-mentioned function can be exhibited. Thereby, in the arrangement direction of the first ridges 155, a space is created between the adjacent first ridges 155 on the bottom surface side of the recess 153 for water intake, and the plurality of first ridges 155 have a so-called wedge wire structure. Constitute. Therefore, the 1st protruding item | line 155 can suppress the pressure loss of the water which flowed in into the recessed part 153 for water intake.
　第２凸条１５６は、第１凸条１５５と同じように、取水用凹部１５３の底面側からエミッタ本体１２２の第１表面１２０ａ側に向かうにつれて幅が大きくなるように形成されていてもよいし、取水用凹部１５３の底面からエミッタ本体１２２の第１表面１２０ａまで同じ幅となるように形成されていてもよい。 Similarly to the first ridge 155, the second ridge 156 may be formed so that the width increases from the bottom surface side of the water intake recess 153 toward the first surface 120a side of the emitter body 122. Further, it may be formed to have the same width from the bottom surface of the water intake recess 153 to the first surface 120 a of the emitter body 122.
　取水用貫通孔１５２は、取水用凹部１５３の底面に形成されている。取水用貫通孔１５２の形状、位置および数は、取水用凹部１５３の内部に取り込まれた灌漑用液体をエミッタ本体１２２内に取り込むことができれば特に限定されない。取水用貫通孔１５２は、取水用凹部１５３の底面の長軸方向に沿って形成された１つの長孔である。長孔は、複数の第１凸条１５５により覆われている。そのため、表側から見た場合、取水用貫通孔１５２は、多数の貫通孔に分かれているように見える。 The water intake through hole 152 is formed on the bottom surface of the water intake recess 153. The shape, position, and number of the water intake through holes 152 are not particularly limited as long as the irrigation liquid taken into the water intake recess 153 can be taken into the emitter body 122. The water intake through hole 152 is a single long hole formed along the long axis direction of the bottom surface of the water intake recess 153. The long hole is covered with a plurality of first ridges 155. Therefore, when viewed from the front side, the water intake through hole 152 appears to be divided into a large number of through holes.
　第１接続溝１３２（第１接続流路１４１）は、取水用貫通孔１５２（取水部１３１）と、第１減圧溝１３３および第２減圧溝１３４とを接続する。第１接続溝１３２は、エミッタ本体１２２の第２表面１２０ｂ側に外縁部に沿って略Ｕ字状に形成されている。第１接続溝１３２の一端（取水用貫通孔１５２が配置されていない側）には、第１減圧溝１３３が接続されており、第１接続溝１３２の中央部付近には、第２減圧溝１３４が接続されている。第１接続溝１３２は、一部の領域が後述する第１減圧溝１３３および第２減圧溝１３４と同様のジグザグ形状の平面視形状を有し、減圧溝としても機能するように形成されている。チューブ１１０とエミッタ本体１２２（エミッタ１２０）とが接合されることにより、第１接続溝１３２とチューブ１１０の内壁面とにより、第１接続流路１４１が形成される。取水部１３１から取り込まれた灌漑用液体は、第１接続流路１４１を通って、第１減圧流路１４２および第２減圧流路１４４に流れる。 The first connection groove 132 (first connection flow path 141) connects the water intake through hole 152 (water intake part 131) to the first pressure reduction groove 133 and the second pressure reduction groove 134. The first connection groove 132 is formed in a substantially U shape along the outer edge on the second surface 120 b side of the emitter body 122. A first decompression groove 133 is connected to one end of the first connection groove 132 (the side where the water intake through hole 152 is not disposed), and the second decompression groove is located near the center of the first connection groove 132. 134 is connected. The first connection groove 132 has a zigzag plan view similar to a first decompression groove 133 and a second decompression groove 134, which will be described later, in a part of the region, and is also formed to function as a decompression groove. . By joining the tube 110 and the emitter main body 122 (emitter 120), the first connection channel 141 is formed by the first connection groove 132 and the inner wall surface of the tube 110. The irrigation liquid taken in from the water intake 131 flows through the first connection channel 141 to the first decompression channel 142 and the second decompression channel 144.
　第１減圧溝１３３（第１減圧流路１４２）は、流量減少部１３６より上流側の第１流路１４３に配置されており、第１接続溝１３２（第１接続流路１４１）と流量減少部１３６とを接続する。第１減圧溝１３３（第１減圧流路１４２）は、取水部１３１から取り入れられた灌漑用液体の圧力を減圧させて、流量減少部１３６に導く。第１減圧溝１３３は、第２表面１２０ｂ側の外縁部に長軸方向に沿って配置されている。第１減圧溝１３３の上流端は第１接続溝１３２に接続されており、下流端には流量減少部１３６に連通した流量減少用貫通孔１６１が配置されている。第１減圧溝１３３の形状は、前述の機能を発揮することができれば特に限定されない。本実施の形態では、第１減圧溝１３３の平面視形状は、ジグザグ形状である。第１減圧溝１３３は、内側面から突出する略三角柱形状の凸部１６２が灌漑用液体の流れる方向に沿って交互に配置されている。凸部１６２は、平面視したときに、先端が第１減圧溝１３３の中心軸を超えないように配置されている。チューブ１１０とエミッタ本体１２２（エミッタ１２０）とが接合されることにより、第１減圧溝１３３とチューブ１１０の内壁面とにより、第１減圧流路１４２が形成される。取水部１３１から取り込まれた灌漑用液体のうち、少なくとも一部の灌漑用液体は、第１減圧流路１４２により減圧されて流量減少部１３６に導かれる。 The first pressure reducing groove 133 (first pressure reducing flow path 142) is disposed in the first flow path 143 upstream of the flow rate reducing unit 136, and the flow rate decreases with the first connection groove 132 (first connection flow path 141). The unit 136 is connected. The first depressurization groove 133 (first depressurization flow path 142) reduces the pressure of the irrigation liquid taken from the water intake unit 131 and guides it to the flow rate reduction unit 136. The first decompression groove 133 is disposed along the major axis direction at the outer edge portion on the second surface 120b side. The upstream end of the first pressure reducing groove 133 is connected to the first connecting groove 132, and the flow rate reducing through-hole 161 communicating with the flow rate reducing unit 136 is disposed at the downstream end. The shape of the first decompression groove 133 is not particularly limited as long as the above-described function can be exhibited. In the present embodiment, the plan view shape of the first decompression groove 133 is a zigzag shape. In the first decompression grooves 133, convex portions 162 having a substantially triangular prism shape protruding from the inner surface are alternately arranged along the direction in which the irrigation liquid flows. The convex portion 162 is arranged so that the tip does not exceed the central axis of the first decompression groove 133 when viewed in plan. By joining the tube 110 and the emitter body 122 (emitter 120), the first decompression channel 142 is formed by the first decompression groove 133 and the inner wall surface of the tube 110. Of the irrigation liquid taken in from the water intake unit 131, at least a part of the irrigation liquid is decompressed by the first decompression flow path 142 and guided to the flow rate reduction unit 136.
　第２減圧溝１３４（第２減圧流路１４４）は、流路開閉部１３７より上流側の第２流路１４６に配置されており、第１接続溝１３２（第１接続流路１４１）と流路開閉部１３７とを接続する。第２減圧溝１３４（第２減圧流路１４４）は、取水部１３１から取り入れられた灌漑用液体を流路開閉部１３７に導く。第２減圧溝１３４の上流端は接続溝１３２に接続されており、下流端には流路開閉部１３７に連通した流路開閉用貫通孔１６３が形成されている。第２減圧溝１３４は、一部の領域が第１減圧溝１３３と同様のジグザグ形状の平面視形状を有し、減圧溝として機能するように形成されている。チューブ１１０とエミッタ本体１２２（エミッタ１２０）とが接合されることにより、第２減圧溝１３４とチューブ１１０の内壁面の一部とにより、第２減圧流路１４４が形成される。取水部１３１から取り込まれた灌漑用液体のうち、一部の灌漑用液体は、第２減圧流路１４４を通過して流路開閉部１３７に導かれる。 The second depressurization groove 134 (second depressurization flow path 144) is disposed in the second flow path 146 upstream of the flow path opening / closing part 137, and flows with the first connection groove 132 (first connection flow path 141). The road opening / closing part 137 is connected. The second decompression groove 134 (second decompression channel 144) guides the irrigation liquid taken from the water intake unit 131 to the channel opening / closing unit 137. The upstream end of the second decompression groove 134 is connected to the connection groove 132, and a flow passage opening / closing through hole 163 communicating with the flow passage opening / closing portion 137 is formed at the downstream end. The second decompression groove 134 has a zigzag planar view similar to the first decompression groove 133 in a part of the region, and is formed so as to function as a decompression groove. By joining the tube 110 and the emitter main body 122 (emitter 120), the second decompression channel 144 is formed by the second decompression groove 134 and a part of the inner wall surface of the tube 110. Among the irrigation liquid taken in from the water intake unit 131, a part of the irrigation liquid passes through the second decompression channel 144 and is guided to the channel opening / closing unit 137.
　流量減少部１３６は、第１流路１４３内において第１減圧流路１４２（第１減圧溝１３３）と吐出部１３８との間に配置されており、かつエミッタ本体１２２の第１表面１２０ａ側に配置されている。流量減少部１３６は、チューブ１１０内の灌漑用液体の圧力に応じて灌漑用液体の流量を減少させつつ、灌漑用液体を吐出部１３８に送る。流量減少部１３６の構成は、前述の機能を発揮することができれば特に限定されない。流量減少部１３６は、第１減圧溝１３３（第１減圧流路１４２）に連通した流量減少用貫通孔１６１と、流量減少用凹部１７１と、第１弁座部１７２と、連通溝１７３と、吐出部１３８に連通した吐出用貫通孔１７４と、フィルム１２４の一部である第１ダイヤフラム部１７５と、第２接続溝１３５（第２接続流路１４５）に連通した第１接続孔１７６と、を有する。 The flow rate reduction unit 136 is disposed in the first channel 143 between the first decompression channel 142 (first decompression groove 133) and the discharge unit 138, and on the first surface 120a side of the emitter body 122. Has been placed. The flow rate reduction unit 136 sends the irrigation liquid to the discharge unit 138 while reducing the flow rate of the irrigation liquid according to the pressure of the irrigation liquid in the tube 110. The configuration of the flow rate reduction unit 136 is not particularly limited as long as the above-described function can be exhibited. The flow rate reducing portion 136 includes a flow rate reducing through hole 161 communicated with the first pressure reducing groove 133 (first pressure reducing flow path 142), a flow rate reducing recess portion 171, a first valve seat portion 172, a communication groove 173, A discharge through-hole 174 communicating with the discharge unit 138, a first diaphragm 175 that is a part of the film 124, a first connection hole 176 communicating with the second connection groove 135 (second connection channel 145), Have
　流量減少用凹部１７１の平面視形状は、略円形状である。流量減少用凹部１７１の底面には、流量減少用貫通孔１６１、吐出用貫通孔１７４、第１接続孔１７６、および第１弁座部１７２が配置されている。流量減少用凹部１７１の深さは、特に限定されず、連通溝１７３の深さ以上であればよい。 The plan view shape of the flow rate reducing recess 171 is substantially circular. On the bottom surface of the flow rate reducing recess 171, a flow rate reducing through hole 161, a discharge through hole 174, a first connection hole 176, and a first valve seat portion 172 are arranged. The depth of the flow rate reducing recess 171 is not particularly limited as long as it is equal to or greater than the depth of the communication groove 173.
　吐出用貫通孔１７４は、流量減少用凹部１７１の底面の中央部分に配置されており、吐出部１３８に連通している。 The discharge through-hole 174 is disposed in the central portion of the bottom surface of the flow rate reducing recess 171 and communicates with the discharge portion 138.
　第１弁座部１７２は、吐出用貫通孔１７４を取り囲むように流量減少用凹部１７１の底面に配置されている。第１弁座部１７２は、チューブ１１０を流れる灌漑用液体の圧力が高い場合に、第１ダイヤフラム部１７５が密着できるように形成されている。第１弁座部１７２に第１ダイヤフラム部１７５が接触することによって、流量減少用凹部１７１から吐出部１３８に流れ込む灌漑用液体の流量を減少させる。第１弁座部１７２の形状は、前述の機能を発揮することができれば特に限定されず、たとえば、円環状の凸部とすることができる。より具体的には、第１弁座部１７２の形状は、その弁座面が吐出用貫通孔１７４の開口部から流量減少用凹部１７１の底面に向かって傾斜するような形状とすることができる。第１弁座部１７２の第１ダイヤフラム部１７５が密着可能な領域の一部には、流量減少用凹部１７１の内部と吐出用貫通孔１７４を連通する連通溝１７３が形成されている。 The first valve seat 172 is disposed on the bottom surface of the flow rate reducing recess 171 so as to surround the discharge through hole 174. The first valve seat portion 172 is formed so that the first diaphragm portion 175 can be in close contact when the pressure of the irrigation liquid flowing through the tube 110 is high. When the first diaphragm portion 175 comes into contact with the first valve seat portion 172, the flow rate of the irrigation liquid flowing from the flow rate reducing recess portion 171 into the discharge portion 138 is reduced. The shape of the 1st valve seat part 172 will not be specifically limited if the above-mentioned function can be exhibited, For example, it can be set as an annular | circular shaped convex part. More specifically, the shape of the first valve seat portion 172 can be a shape in which the valve seat surface is inclined from the opening portion of the discharge through hole 174 toward the bottom surface of the flow rate reducing recess portion 171. . A communication groove 173 that connects the inside of the flow rate reducing recess 171 and the discharge through-hole 174 is formed in a part of the region where the first diaphragm portion 175 of the first valve seat portion 172 can be in close contact.
　第１減圧溝１３３（第１減圧流路１４２）に接続した流量減少用貫通孔１６１、および第２接続溝１３５（第２接続流路１４５）に連通した第１接続孔１７６は、流量減少用凹部１７１の底面において、第１弁座部１７２が配置されていない領域に形成されている。 The flow rate reducing through hole 161 connected to the first pressure reducing groove 133 (first pressure reducing channel 142) and the first connection hole 176 communicating with the second connection groove 135 (second connecting channel 145) are used for reducing the flow rate. The bottom surface of the recess 171 is formed in a region where the first valve seat 172 is not disposed.
　第１ダイヤフラム部１７５は、フィルム１２４の一部である。フィルム１２４がエミッタ本体１２０に接合されたとき、第１ダイヤフラム部１７５は、流量減少用凹部１７１の内部とチューブ１１０の内部とを仕切るように配置されて、流量減少用凹部１７１の上面を覆って流量減少部１３６における流路壁の一部を構成する。第１ダイヤフラム部１７５は、チューブ１１０内の灌漑用液体の圧力に応じて、第１弁座部１７２に接触するように変形する。具体的には、第１ダイヤフラム部１７５は、灌漑用液体の圧力が高くなるにつれて、第１弁座部１７２に向かって変形し、やがて第１弁座部１７２に接触する。第１ダイヤフラム部１７５が第１弁座部１７２に密着している場合であっても、第１ダイヤフラム部１７５は、流量減少用貫通孔１６１、吐出用貫通孔１７４および連通溝１７３を閉塞しないため、流量減少用貫通孔１６１から送られてきた灌漑用液体は、連通溝１７３および吐出用貫通孔１７４を通って、吐出部１３８に送られうる。なお、第１ダイヤフラム部１７５は、後述の第２ダイヤフラム部１８３と隣接して配置されている。 The first diaphragm portion 175 is a part of the film 124. When the film 124 is joined to the emitter body 120, the first diaphragm portion 175 is arranged so as to partition the inside of the flow rate reducing recess 171 and the inside of the tube 110, and covers the upper surface of the flow rate reducing recess 171. A part of the flow path wall in the flow rate reducing portion 136 is formed. The first diaphragm portion 175 is deformed so as to contact the first valve seat portion 172 in accordance with the pressure of the irrigation liquid in the tube 110. Specifically, the first diaphragm portion 175 deforms toward the first valve seat portion 172 as the pressure of the irrigation liquid increases, and eventually comes into contact with the first valve seat portion 172. Even if the first diaphragm portion 175 is in close contact with the first valve seat portion 172, the first diaphragm portion 175 does not block the flow rate reducing through hole 161, the discharge through hole 174, and the communication groove 173. The irrigation liquid sent from the flow rate reducing through-hole 161 can be sent to the discharge section 138 through the communication groove 173 and the discharge through-hole 174. Note that the first diaphragm portion 175 is disposed adjacent to a second diaphragm portion 183 described later.
　流路開閉部１３７は、第２流路１４６内において第２減圧流路１４４（第２減圧溝１３４）と第２接続溝１３５（第２接続流路１４５）との間に配置されており、かつエミッタ本体１２２の第１表面１２０ａ側に配置されている。流路開閉部１３７は、チューブ１１０内の圧力に応じて第２流路１４６を開放して、灌漑用液体を吐出部１３８に送る。流路開閉部１３７の下流は第２接続溝１３５（第２接続流路１４５）を通じて流量減少部１３６に接続されており、第２減圧流路１４４（第２減圧溝１３４）からの灌漑用液体は、第２接続溝１３５（第２接続流路１４５）および流量減少部１３６を通って吐出部１３８に到達する。流路開閉部１３７は、第２減圧流路１４４（第２減圧溝１３４）に通じた流路開閉用貫通孔１６３と、流路開閉用凹部１８１と、第２弁座部１８２と、フィルム１２４の一部である第２ダイヤフラム部１８３と、第２接続溝１３５（第２接続流路１４５）に連通した第２接続孔１８４と、を有する。 The channel opening / closing part 137 is disposed in the second channel 146 between the second decompression channel 144 (second decompression groove 134) and the second connection groove 135 (second connection channel 145), The emitter body 122 is disposed on the first surface 120a side. The channel opening / closing unit 137 opens the second channel 146 according to the pressure in the tube 110 and sends the irrigation liquid to the discharge unit 138. The downstream of the channel opening / closing unit 137 is connected to the flow rate reducing unit 136 through the second connection groove 135 (second connection channel 145), and the irrigation liquid from the second decompression channel 144 (second decompression groove 134). Reaches the discharge part 138 through the second connection groove 135 (second connection flow path 145) and the flow rate reduction part 136. The channel opening / closing part 137 includes a channel opening / closing through hole 163 communicating with the second decompression channel 144 (second decompression groove 134), a channel opening / closing recess 181, a second valve seat 182, and a film 124. 2nd diaphragm part 183 and 2nd connection hole 184 connected to the 2nd connection slot 135 (2nd connection channel 145).
　流路開閉用凹部１８１の平面視形状は、略円形状である。流路開閉用凹部１８１の底面には、流路開閉用貫通孔１６３と、第２弁座部１８２と、第２接続溝１３５（流量減少部１３６）に連通した第２接続孔１８４と、が配置されている。流路開閉用凹部１８１の底面は、流量減少用凹部１７１の底面より第１表面１２０ａ側に配置されている。すなわち、流路開閉用凹部１８１は、流量減少用凹部１７１より浅く形成されている。第２弁座部１８２の頂部は、第１弁座部１７２の頂部より第１表面１２０ａ側に配置されている。これにより、フィルム１２４が灌漑用液体の圧力により変形した場合に、フィルム１２４は、第１弁座部１７２より先に第２弁座部１８２に接触する。流路開閉用凹部１８１の平面形状は、流量減少用凹部１７１と同じ大きさおよび同じ形状でもよいし、流量減少用凹部１７１より小さく形成されてもよい。流量減少用凹部１７１と、流路開閉用凹部１８１とは、エミッタ本体１２２の長軸方向に並んで配置されている。第２減圧流路１４４から流路開閉用貫通孔１６３を通過して流路開閉用凹部１８１に流れ込んだ灌漑用液体は、第２接続孔１８４、第２接続流路１４５および第１接続孔１７６を経由して、流量減少部１３６に流れ込む。 The plan view shape of the channel opening / closing recess 181 is substantially circular. On the bottom surface of the channel opening / closing recess 181, there are a channel opening / closing through hole 163, a second valve seat portion 182, and a second connection hole 184 communicating with the second connection groove 135 (flow rate reducing portion 136). Has been placed. The bottom surface of the channel opening / closing recess 181 is disposed closer to the first surface 120 a than the bottom surface of the flow rate reducing recess 171. That is, the channel opening / closing recess 181 is formed shallower than the flow rate reducing recess 171. The top portion of the second valve seat portion 182 is disposed on the first surface 120 a side from the top portion of the first valve seat portion 172. Accordingly, when the film 124 is deformed by the pressure of the irrigation liquid, the film 124 comes into contact with the second valve seat portion 182 before the first valve seat portion 172. The planar shape of the channel opening / closing recess 181 may be the same size and the same shape as the flow rate reducing recess 171 or may be smaller than the flow rate reducing recess 171. The flow rate reducing recess 171 and the flow path opening / closing recess 181 are arranged side by side in the major axis direction of the emitter body 122. The irrigation liquid that has flowed from the second decompression flow path 144 through the flow path opening / closing through-hole 163 into the flow path opening / closing recess 181 has the second connection hole 184, the second connection flow path 145, and the first connection hole 176. To flow into the flow rate reduction unit 136.
　第２減圧溝１３４に連通した流路開閉用貫通孔１６３は、流路開閉用凹部１８１の底面において、第２弁座部１８２が配置されていない領域に形成されている。なお、第２減圧溝１３４に連通した流路開閉用貫通孔１６３が第２弁座部１８２に囲まれるように配置され、第２接続溝１３５（第２接続流路１４５）に連通した第２接続孔１８４が第２弁座部１８２の外側に配置されていてもよい。 The passage opening / closing through-hole 163 communicating with the second decompression groove 134 is formed on the bottom surface of the passage opening / closing recess 181 in a region where the second valve seat portion 182 is not disposed. A second opening / closing through-hole 163 communicating with the second decompression groove 134 is disposed so as to be surrounded by the second valve seat portion 182, and a second communicating with the second connection groove 135 (second connection channel 145). The connection hole 184 may be disposed outside the second valve seat portion 182.
　第２弁座部１８２は、第２接続孔１８４を取り囲むように流路開閉用凹部１８１の底面に配置されている。また、第２弁座部１８２は、第２ダイヤフラム部１８３に面して非接触に配置され、チューブ１１０を流れる灌漑用液体の圧力によりフィルム１２４が変形した場合に、第２ダイヤフラム部１８３が密着できるように形成されている。このとき、第２ダイヤフラム部１８３は、第２弁座部１８２に密着して流路開閉用貫通孔１６３を閉塞し、その結果として第２流路１４６を閉塞する。第２弁座部１８２の形状は、前述の機能を発揮することができれば特に限定されない。本実施の形態では、第２弁座部１８２は、流路開閉用貫通孔１６３が設けられた流路開閉用凹部１８１の底面の一部である。なお、第２弁座部１８２は、第２接続孔１８４を取り囲むように配置された円環状の凸部であってもよい。 The second valve seat 182 is disposed on the bottom surface of the channel opening / closing recess 181 so as to surround the second connection hole 184. Further, the second valve seat portion 182 faces the second diaphragm portion 183 and is disposed in a non-contact manner. When the film 124 is deformed by the pressure of the irrigation liquid flowing through the tube 110, the second diaphragm portion 183 is in close contact with the second valve seat portion 182. It is formed to be able to. At this time, the second diaphragm portion 183 is in close contact with the second valve seat portion 182 to close the flow passage opening / closing through hole 163, and as a result, closes the second flow passage 146. The shape of the 2nd valve seat part 182 will not be specifically limited if the above-mentioned function can be exhibited. In the present embodiment, the second valve seat 182 is a part of the bottom surface of the channel opening / closing recess 181 provided with the channel opening / closing through hole 163. The second valve seat portion 182 may be an annular convex portion disposed so as to surround the second connection hole 184.
　第２ダイヤフラム部１８３は、フィルム１２４の一部であり、第１ダイヤフラム部１７５と隣接して配置されている。フィルム１２４がエミッタ本体１２０に接合されたとき、第２ダイヤフラム部１８３は、流路開閉用凹部１８１の内部とチューブ１１０の内部とを仕切るように配置されて、流路開閉用凹部１８１の上面を覆って流量減少部１３６における流路壁の一部を構成する。第２ダイヤフラム部１８３は、チューブ１１０内の灌漑用液体の圧力に応じて、第２弁座部１８２に接触するように変形する。具体的には、第２ダイヤフラム部１８３は、灌漑用液体の圧力が高くなるにつれて、第２弁座部１８２に向かって変形し、第２弁座部１８２に接触する。これにより、第２流路１４６（第２接続孔１８４）は閉塞される。 The second diaphragm portion 183 is a part of the film 124 and is disposed adjacent to the first diaphragm portion 175. When the film 124 is joined to the emitter main body 120, the second diaphragm portion 183 is arranged so as to partition the inside of the channel opening / closing recess 181 and the inside of the tube 110, and the upper surface of the channel opening / closing recess 181 is formed. A part of the flow path wall in the flow rate reducing portion 136 is covered. The second diaphragm portion 183 is deformed so as to contact the second valve seat portion 182 according to the pressure of the irrigation liquid in the tube 110. Specifically, the second diaphragm portion 183 deforms toward the second valve seat portion 182 and contacts the second valve seat portion 182 as the pressure of the irrigation liquid increases. Thereby, the 2nd flow path 146 (2nd connection hole 184) is obstruct | occluded.
　吐出部１３８は、エミッタ本体１２２の第２表面１２０ｂ側に配置されている。吐出部１３８は、吐出用貫通孔１７４からの灌漑用液体をチューブ１１０の吐出口１１２に送る。吐出部１３８の構成は、前述の機能を発揮することができれば特に限定されない。本実施の形態では、吐出部１３８は、吐出用凹部１９１と、侵入防止部１９２とを有する。 The discharge unit 138 is disposed on the second surface 120b side of the emitter body 122. The discharge unit 138 sends the irrigation liquid from the discharge through-hole 174 to the discharge port 112 of the tube 110. The configuration of the discharge unit 138 is not particularly limited as long as the above function can be exhibited. In the present embodiment, the discharge unit 138 includes a discharge recess 191 and an intrusion prevention unit 192.
　吐出用凹部１９１は、エミッタ本体１２２の第２表面１２０ｂ側に配置されている。吐出用凹部１９１の平面視形状は、略矩形である。吐出用凹部１９１の底面には、吐出用貫通孔１７４および侵入防止部１９２が配置されている。 The discharge recess 191 is disposed on the second surface 120 b side of the emitter body 122. The shape of the discharge recess 191 in plan view is substantially rectangular. A discharge through hole 174 and an intrusion prevention portion 192 are disposed on the bottom surface of the discharge recess 191.
　侵入防止部１９２は、吐出口１１２からの異物の侵入を防止する。侵入防止部１９２は、前述の機能を発揮することができれば特に限定されない。本実施の形態では、侵入防止部１９２は、隣接して配置された複数の凸条部１９３を有する。複数の凸条部１９３は、エミッタ本体１２２（エミッタ１２０）をチューブ１１０に接合した場合に、吐出用貫通孔１７４および吐出口１１２の間に位置するように配置されている。 The intrusion prevention unit 192 prevents intrusion of foreign matter from the discharge port 112. The intrusion prevention unit 192 is not particularly limited as long as it can exhibit the above-described function. In the present embodiment, the intrusion prevention unit 192 has a plurality of ridges 193 arranged adjacent to each other. The plurality of ridges 193 are disposed so as to be positioned between the discharge through hole 174 and the discharge port 112 when the emitter body 122 (emitter 120) is joined to the tube 110.
　フィルム１２４は、第１ダイヤフラム部１７５および第２ダイヤフラム部１８３を有し、エミッタ本体１２２と接合したときに、流量減少部１３６とおよび流路開閉部１３７の上面（流路壁）を構成する。フィルム１２４の厚さは、例えば０．３ｍｍである。 The film 124 includes a first diaphragm portion 175 and a second diaphragm portion 183, and constitutes the upper surface (flow channel wall) of the flow rate reducing portion 136 and the flow channel opening / closing portion 137 when joined to the emitter body 122. The thickness of the film 124 is 0.3 mm, for example.
　ヒンジ部１２６は、エミッタ本体１２２の第１表面１２０ａの一部に接続されている。ヒンジ部１２６の厚さは、フィルム１２４と同じ厚さであり、エミッタ本体１２２およびフィルム１２４と一体的に成形されている。なお、フィルム１２４は、エミッタ本体１２２と別体として準備して、エミッタ本体１２２と接合してもよい。 The hinge portion 126 is connected to a part of the first surface 120 a of the emitter body 122. The hinge portion 126 has the same thickness as the film 124 and is formed integrally with the emitter body 122 and the film 124. The film 124 may be prepared as a separate body from the emitter body 122 and bonded to the emitter body 122.
　（点滴灌漑用チューブおよびエミッタの動作）
　次に、点滴灌漑用チューブ１００の動作について説明する。まず、チューブ１１０内に灌漑用液体が送液される。灌漑用液体の例には、水、液体肥料、農薬およびこれらの混合液が含まれる。点滴灌漑用チューブ１００へ送液される灌漑用液体の圧力は、簡易に点滴灌漑法を導入できるように、またチューブ１１０およびエミッタ１２０の破損を防止するため、０．１ＭＰａ以下であることが好ましい。チューブ１１０内の灌漑用液体は、取水部１３１からエミッタ１２０内に取り込まれる。具体的には、チューブ１１０内の灌漑用液体は、第１凸条１５５間の隙間から取水用凹部１５３に入り込み、取水用貫通孔１５２を通過する。このとき、取水部１３１は、スクリーン部１５１（第１凸条１５５間の隙間）を有しているため、灌漑用液体中の浮遊物を除去することができる。また、取水部１３１には、いわゆるウェッジワイヤー構造が形成されているため、取水部１３１への水の取り込み時における水の圧力損失は抑制される。 (Operation of drip irrigation tube and emitter)
Next, the operation of the drip irrigation tube 100 will be described. First, irrigation liquid is fed into the tube 110. Examples of irrigation liquids include water, liquid fertilizers, pesticides and mixtures thereof. The pressure of the irrigation liquid fed to the drip irrigation tube 100 is preferably 0.1 MPa or less so that the drip irrigation method can be easily introduced and the tube 110 and the emitter 120 are prevented from being damaged. . The irrigation liquid in the tube 110 is taken into the emitter 120 from the water intake 131. Specifically, the irrigation liquid in the tube 110 enters the water intake recess 153 through the gap between the first ridges 155 and passes through the water intake through hole 152. At this time, since the water intake part 131 has the screen part 151 (gap between the 1st protruding item | lines 155), the suspended | floating matter in the irrigation liquid can be removed. Moreover, since the so-called wedge wire structure is formed in the water intake part 131, the pressure loss of the water at the time of taking-in of the water to the water intake part 131 is suppressed.
　取水部１３１から取り込まれた灌漑用液体は、第１接続流路１４１に到達する。第１接続流路１４１に到達した灌漑用液体は、第１減圧流路１４２および第２減圧流路１４４に流れ込む。 The irrigation liquid taken in from the water intake unit 131 reaches the first connection channel 141. The irrigation liquid that has reached the first connection channel 141 flows into the first decompression channel 142 and the second decompression channel 144.
　第１減圧流路１４２に流れ込んだ灌漑用液体は、流量減少用貫通孔１６１を通って、流量減少部１３６に到達する。流量減少部１３６に流れ込んだ灌漑用液体は、吐出部１３８に流れ込む。吐出部１３８に流れ込んだ灌漑用液体は、チューブ１１０の吐出口１１２からチューブ１１０外に吐出される。 The irrigation liquid that has flowed into the first decompression flow path 142 reaches the flow rate reduction unit 136 through the flow rate reduction through hole 161. The irrigation liquid that has flowed into the flow rate reduction unit 136 flows into the discharge unit 138. The irrigation liquid that has flowed into the discharge unit 138 is discharged from the discharge port 112 of the tube 110 to the outside of the tube 110.
　一方、第２減圧流路１４４に流れ込んだ灌漑用液体は、流路開閉用貫通孔１６３を通って流路開閉部１３７に流れ込む。流路開閉部１３７に流れ込んだ灌漑用液体は、流量減少部１３６を通って吐出部１３８に流れ込む。吐出部１３８に流れ込んだ灌漑用液体は、チューブ１１０の吐出口１１２からチューブ１１０外に吐出される。 On the other hand, the irrigation liquid that has flowed into the second decompression channel 144 flows into the channel opening / closing part 137 through the channel opening / closing through hole 163. The irrigation liquid that has flowed into the flow path opening / closing unit 137 flows into the discharge unit 138 through the flow rate reducing unit 136. The irrigation liquid that has flowed into the discharge unit 138 is discharged from the discharge port 112 of the tube 110 to the outside of the tube 110.
　前述したように、流量減少部１３６と、流路開閉部１３７とは連通している。また、流量減少部１３６では、チューブ１１０内の灌漑用液体の圧力に応じて第１ダイヤフラム部１７５によって灌漑用液体の流量が制御され、流路開閉部１３７では、チューブ１１０内の灌漑用液体の圧力に応じて第２ダイヤフラム部１８３によって灌漑用液体の流量が制御される。そこで、チューブ１１０内の灌漑用液体の圧力に応じた流路開閉部１３７および流量減少部１３６の動作について説明する。 As described above, the flow rate reducing unit 136 and the flow path opening / closing unit 137 communicate with each other. Further, in the flow rate reduction unit 136, the flow rate of the irrigation liquid is controlled by the first diaphragm unit 175 according to the pressure of the irrigation liquid in the tube 110, and in the flow path opening / closing unit 137, the irrigation liquid in the tube 110 is controlled. The flow rate of the irrigation liquid is controlled by the second diaphragm unit 183 in accordance with the pressure. Therefore, the operation of the flow path opening / closing unit 137 and the flow rate reducing unit 136 according to the pressure of the irrigation liquid in the tube 110 will be described.
　チューブ１１０内に灌漑用液体を送液する前は、フィルム１２４に灌漑用液体の圧力が加わらないため、第１ダイヤフラム部１７５および第２ダイヤフラム部１８３は、変形していない。 Since the pressure of the irrigation liquid is not applied to the film 124 before the irrigation liquid is fed into the tube 110, the first diaphragm portion 175 and the second diaphragm portion 183 are not deformed.
　灌漑用液体の圧力が低圧の場合、灌漑用液体は、第１流路１４３および第２流路１４６の両方を通ってチューブ外に吐出される。灌漑用液体の圧力が高くなるにつれて、第１ダイヤフラム部１７５が第１弁座部１７２に向かって変形するとともに、第２ダイヤフラム部１８３が第２弁座部１８２に向かって変形する。灌漑用液体の圧力が高まると、第２ダイヤフラム部１８３が第２弁座部１８２に接触して第２流路１４６が閉塞される。第２流路１４６が閉塞されると、灌漑用液体は、第１流路１４３のみを通って吐出される。このように、灌漑用液体の圧力がさらに高まると、流量減少部１３６からの灌漑用液体の流量は、第１流路１４３の通過量に応じた流量に制御され、吐出口からは、第１流路１４３の通過量に応じた流量の灌漑用液体のみが吐出される。 When the pressure of the irrigation liquid is low, the irrigation liquid is discharged out of the tube through both the first flow path 143 and the second flow path 146. As the pressure of the irrigation liquid increases, the first diaphragm portion 175 deforms toward the first valve seat portion 172 and the second diaphragm portion 183 deforms toward the second valve seat portion 182. When the pressure of the irrigation liquid increases, the second diaphragm portion 183 comes into contact with the second valve seat portion 182 and the second flow path 146 is closed. When the second flow path 146 is closed, the irrigation liquid is discharged only through the first flow path 143. As described above, when the pressure of the irrigation liquid is further increased, the flow rate of the irrigation liquid from the flow rate reduction unit 136 is controlled to a flow rate according to the passage amount of the first flow path 143, and from the discharge port, the first flow rate is increased. Only the irrigation liquid having a flow rate corresponding to the passage amount of the flow path 143 is discharged.
　チューブ内の灌漑用液体の圧力がさらに高まると、第１ダイヤフラム部１７５は、第１弁座部１７２に向かってさらに変形し、やがて第１弁座部１７２の弁座面に密着する。エミッタ１２０では、第１弁座部１７２の弁座面が外縁に向けて下方に傾斜していることから、第１ダイヤフラム部１７５は、灌漑用液体の圧力がより高くなるに連れて、弁座面により一層密着し、連通溝１７３と第１ダイヤフラム部１７５で形成される流路は徐々に長くなり、その外縁側の開口部は徐々に狭くなる。このように、灌漑用液体の圧力がさらに高まると、流量減少部１３６からの灌漑用液体の流量は、当該流路の開口面積に応じた流量に制御され、最終的に吐出口からは、当該開口面積に応じた流量の灌漑用液体のみが吐出される。 When the pressure of the irrigation liquid in the tube is further increased, the first diaphragm portion 175 is further deformed toward the first valve seat portion 172 and eventually comes into close contact with the valve seat surface of the first valve seat portion 172. In the emitter 120, since the valve seat surface of the first valve seat portion 172 is inclined downward toward the outer edge, the first diaphragm portion 175 has the valve seat as the pressure of the irrigation liquid increases. The flow path formed by the communication groove 173 and the first diaphragm portion 175 is gradually lengthened, and the opening on the outer edge side is gradually narrowed. As described above, when the pressure of the irrigation liquid is further increased, the flow rate of the irrigation liquid from the flow rate reduction unit 136 is controlled to a flow rate according to the opening area of the flow path, and finally from the discharge port, Only irrigation liquid with a flow rate corresponding to the opening area is discharged.
　このように、エミッタ１２０では、灌漑用液体の圧力による灌漑用液体の流量の増加と、第２流路１４６の閉塞および第１流路１４３における上記流路の開口面積の減少による灌漑用液体の流量の減少が相殺されるため、灌漑用液体の圧力が増加した場合であっても、吐出口から吐出される灌漑用液体の液量が増加することがない。そのため、点滴灌漑用チューブ１００は、灌漑用液体の圧力が低圧および高圧のいずれの場合であっても、一定量の灌漑用液体をチューブ１１０外に吐出できる。 As described above, the emitter 120 increases the flow rate of the irrigation liquid due to the pressure of the irrigation liquid, and blocks the second flow path 146 and decreases the opening area of the flow path in the first flow path 143. Since the decrease in the flow rate is offset, the amount of the irrigation liquid discharged from the discharge port does not increase even when the pressure of the irrigation liquid increases. Therefore, the drip irrigation tube 100 can discharge a certain amount of irrigation liquid out of the tube 110 regardless of whether the pressure of the irrigation liquid is low or high.
　（エミッタの製造方法）
　本発明において、図６および図６に破線で示す領域Ｆの拡大図である図７に示すように、エミッタ本体１２２は、エミッタ本体１２２と略同一形状である中間成形体２２２をインサート成形、射出成形および圧縮成形などの方法で、金型を用いて作製し、その後、二次加工により中間成形体２２２をエミッタ本体１２２の形状に塑性変形させて、製造される。 (Emitter manufacturing method)
In the present invention, as shown in FIG. 7 which is an enlarged view of a region F indicated by a broken line in FIG. 6 and FIG. 6, the emitter body 122 insert-molds and injects an intermediate molded body 222 having substantially the same shape as the emitter body 122. It is manufactured by using a mold by a method such as molding and compression molding, and then plastically deforming the intermediate molded body 222 into the shape of the emitter body 122 by secondary processing.
　中間成形体２２２は、第１凸条１５５が配置されている各位置に、取水用凹部１５３の底面からの高さが第１凸条１５５よりも高い仮凸条２５５を有する。 The intermediate molded body 222 has provisional ridges 255 that are higher than the first ridges 155 in height from the bottom surface of the water intake depressions 153 at each position where the first ridges 155 are disposed.
　仮凸条２５５は、アンダーカットとなる張出部を有さないことが好ましい。これにより、仮凸条２５５は、無理抜きを必要とするアンダーカットとはならないため、金型からの引き抜きによる離型が容易である。そのため、このような仮凸条２５５を有する中間成形体２２２は、離型時の仮凸条２５５の変形および破損が生じにくい。このとき、仮凸条２５５は、高さ方向（中間成形体２２２の厚み方向）の幅（エミッタ本体１２２に二次加工したときの第２表面１２０ｂ側から第１表面１２０ａ側までの幅）が変化しない略直方体状領域を、その高さ方向の少なくとも一部に有するように形成されてもよい。また、仮凸条２５５は、エミッタ本体１２２に二次加工したときの第２表面１２０ｂ側よりも第１表面１２０ａ側の幅が狭くなるような幅減少領域を、その高さ方向の少なくとも一部に有するように形成されてもよい。つまり、仮凸条２５５は、任意の２点において中間成形体２２２の長軸方向（エミッタ１２０の長軸方向と同一である）の幅を測定したときに、いかなる２点においても、第１表面１２０ａ側の幅と第２表面１２０ｂ側の幅が同一か、または第１表面１２０ａ側において第２表面１２０ｂ側よりも幅が狭くなるように形成されてもよい。これらの中でも、金型からの引き抜きによる離型がより容易になる点から、仮凸条２５５は、第１表面１２０ａ側において第２表面１２０ｂ側よりも幅が狭くなるように形成されていることが好ましく、エミッタ本体１２２に二次加工したときの第２表面１２０ｂ側よりも第１表面１２０ａ側の幅が広くなるような幅拡大領域を、その高さ方向に有さないことが好ましい。 It is preferable that the temporary convex stripe 255 does not have an overhanging portion that becomes an undercut. Thereby, since the temporary protruding item | line 255 does not become an undercut which requires unreasonable extraction, the mold release by extraction from a metal mold | die is easy. Therefore, the intermediate molded body 222 having such provisional ridges 255 is unlikely to be deformed or damaged during release. At this time, the provisional ridge 255 has a width in the height direction (thickness direction of the intermediate molded body 222) (a width from the second surface 120b side to the first surface 120a side when the emitter body 122 is secondarily processed). You may form so that it may have the substantially rectangular parallelepiped area | region which does not change in at least one part of the height direction. In addition, the provisional ridge 255 has at least a part in the height direction in a width reduction region in which the width on the first surface 120a side becomes narrower than the second surface 120b side when the emitter body 122 is secondarily processed. You may form so that it may have. That is, the provisional ridge 255 has the first surface at any two points when the width in the major axis direction of the intermediate formed body 222 (same as the major axis direction of the emitter 120) is measured at two arbitrary points. The width on the 120a side and the width on the second surface 120b side may be the same, or the first surface 120a side may be formed to be narrower than the second surface 120b side. Among these, the provisional protrusion 255 is formed so that the width on the first surface 120a side is narrower than that on the second surface 120b side from the viewpoint of easier release from the mold. It is preferable that there is no widened region in the height direction in which the width on the first surface 120a side is wider than the second surface 120b side when the emitter body 122 is secondarily processed.
　なお、仮凸条２５５のうち、取水用凹部１５３の底面側の領域は、二次加工時に変形しにくいため、製造しようとするエミッタ１２０の第１凸条１５５における当該領域と略同一形状であることが好ましい。 In addition, since the area | region by the side of the bottom face of the recessed part 153 for water intake among the temporary convex stripes 255 is hard to deform | transform at the time of secondary processing, it is substantially the same shape as the said area | region in the 1st convex stripes 155 of the emitter 120 to manufacture. It is preferable.
　中間成形体２２２は、ヒンジ部１２６およびフィルム１２４と一体成形されることが好ましい。 The intermediate molded body 222 is preferably molded integrally with the hinge portion 126 and the film 124.
　仮凸条２５５を有する中間成形体２２２は、その後、二次加工によりエミッタ本体１２２の形状に塑性変形される。具体的には、仮凸条２５５を塑性変形させて、ウェッジワイヤー構造を構成する第１凸条１５５を形成することで、中間成形体２２２はエミッタ本体１２２の形状に塑性変形される。 The intermediate molded body 222 having the provisional ridge 255 is then plastically deformed into the shape of the emitter body 122 by secondary processing. Specifically, the intermediate protrusion 222 is plastically deformed into the shape of the emitter body 122 by plastically deforming the temporary protrusion 255 to form the first protrusion 155 constituting the wedge wire structure.
　塑性変形は、エミッタ本体１２２の第１表面１２０ａ側の頂部における第１凸条１５５の幅が、第２表面１２０ｂ側の任意の高さにおける第１凸条１５５の幅よりも大きくなるように、仮凸条２５５の頂部を塑性変形させて幅方向に広がらせることが可能な方法で行えばよい。たとえば、塑性変形は、熱板プレス、物理的な圧縮および超音波プレスなどの方法で行うことができる。これらの方法の中でも、仮凸条２５５の頂部の塑性変形を安価かつ効果的に行えることから、熱板プレスが好ましい。 The plastic deformation is such that the width of the first ridge 155 at the top of the emitter body 122 on the first surface 120a side is larger than the width of the first ridge 155 at an arbitrary height on the second surface 120b side. What is necessary is just to perform by the method which can carry out the plastic deformation of the top part of the temporary protruding item | line 255, and can make it spread in the width direction. For example, the plastic deformation can be performed by a method such as hot plate pressing, physical compression and ultrasonic pressing. Among these methods, a hot plate press is preferable because the plastic deformation of the top of the provisional ridge 255 can be performed inexpensively and effectively.
　エミッタ１２０は、その後、ヒンジ部１２６を軸にフィルム１２４を回動させ、エミッタ本体１２２の第１表面１２０ａにフィルム１２４を接合することにより構成される。エミッタ本体１２２とフィルム１２４との接合方法は、特に限定されない。エミッタ本体１２２とフィルム１２４との接合方法の例には、フィルム１２４を構成する樹脂材料の溶着や、接着剤による接着などが含まれる。なお、ヒンジ部１２６は、エミッタ本体１２２とフィルム１２４とを接合した後に切断してもよい。なお、フィルム１２４は、エミッタ本体１２２と別体として準備して、エミッタ本体１２２と接合してもよい。 The emitter 120 is then configured by rotating the film 124 about the hinge 126 and joining the film 124 to the first surface 120a of the emitter body 122. The joining method of the emitter body 122 and the film 124 is not particularly limited. Examples of the method for joining the emitter body 122 and the film 124 include welding of a resin material constituting the film 124 and adhesion with an adhesive. The hinge portion 126 may be cut after the emitter body 122 and the film 124 are joined. The film 124 may be prepared as a separate body from the emitter body 122 and bonded to the emitter body 122.
　（効果）
　上述した製造方法によれば、金型からの離型時における第１凸条１５５（仮凸条２５５）の変形および破損を抑制することができる。 (effect)
According to the manufacturing method described above, deformation and breakage of the first ridge 155 (temporary ridge 255) at the time of releasing from the mold can be suppressed.
　また、上述した製造方法によれば、仮凸条２５５の高さや塑性変形の度合いを変更することで、第１凸条１５５によるウェッジワイヤー構造の形状をより容易に調整可能である。つまり、上述した製造方法によれば、製造時における第１凸条１５５の破損および変形を抑制しつつ、第１凸条１５５の、頂部における幅と、より第２表面１２０ｂ側の任意の高さにおける幅と、の比率をより大きくすることも容易である。そのため、上述した製造方法によれば、灌漑用液体中の浮遊物が内部により侵入しにくく、かつ取水部１３１の内部に入り込んだ水の圧力損失がより少ないエミッタを製造することが可能である。 Moreover, according to the manufacturing method mentioned above, the shape of the wedge wire structure by the 1st protruding item | line 155 can be adjusted more easily by changing the height of the temporary protruding item | line 255, or the degree of plastic deformation. In other words, according to the manufacturing method described above, the width at the top of the first ridge 155 and an arbitrary height on the second surface 120b side are suppressed while suppressing the breakage and deformation of the first ridge 155 at the time of manufacture. It is also easy to increase the ratio of the width at. Therefore, according to the manufacturing method described above, it is possible to manufacture an emitter in which suspended matter in the irrigation liquid is less likely to enter the inside and the pressure loss of water that has entered the intake portion 131 is less.
　（エミッタの製造方法の第１の変形例）
　中間成形体２２２は、図８に示すように、仮凸条２５５の頂部に、平面視したときに複数の仮凸条２５５の配列方向に略直交する方向に切込を設けた切込部２５７を有していてもよい。切込部２５７を有する仮凸条２５５は、塑性変形時（特には物理的な圧縮時）に切込部２５７から隣接する仮凸条２５５の方向に開くため、ウェッジワイヤー構造の形状をより容易に作製可能である。 (First Modification of Emitter Manufacturing Method)
As shown in FIG. 8, the intermediate formed body 222 has a cut portion 257 provided with a cut in a direction substantially orthogonal to the arrangement direction of the plurality of temporary convex stripes 255 when viewed from the top at the top of the temporary convex stripes 255. You may have. The provisional ridge 255 having the cut portion 257 opens in the direction of the temporary ridge 255 adjacent from the cut portion 257 at the time of plastic deformation (particularly during physical compression), so the shape of the wedge wire structure is easier. Can be produced.
　（エミッタの製造方法の第２の変形例）
　上述した製造方法では、中間成形体２２２をエミッタ本体１２２の形状に塑性変形させてからエミッタ本体１２２の第１表面１２０ａにフィルム１２４を接合したが、中間成形体２２２の塑性変形とフィルム１２４の接合とは同一工程として行ってもよい。つまり、フィルム１２４を構成する樹脂材料の溶着や、接着剤による接着などのための加熱時に、同時に仮凸条２５５を熱板プレスして第１凸条１５５の形状に塑性変形させることも可能である。そのため、本変形例によれば、エミッタの製造工程を短縮して、より短時間で効率的にエミッタを製造することが可能となる。 (Second Modification of Emitter Manufacturing Method)
In the manufacturing method described above, the intermediate molded body 222 is plastically deformed into the shape of the emitter body 122 and then the film 124 is bonded to the first surface 120a of the emitter body 122. However, the plastic deformation of the intermediate molded body 222 and the bonding of the film 124 are performed. May be performed as the same process. That is, at the time of heating for welding the resin material constituting the film 124 or bonding with an adhesive, it is possible to simultaneously hot plate press the provisional ridge 255 and plastically deform it into the shape of the first ridge 155. is there. Therefore, according to this modification, the emitter manufacturing process can be shortened, and the emitter can be efficiently manufactured in a shorter time.
　なお、エミッタ１２０の形状は上述の説明に限定されることはなく、取水部１３１にウェッジワイヤー構造を構成する第１凸条１５５を有している、いかなる形状のエミッタ１２０にも本発明は適用可能である。 The shape of the emitter 120 is not limited to the above description, and the present invention is applicable to any shape of the emitter 120 having the first protrusion 155 constituting the wedge wire structure in the water intake portion 131. Is possible.
　また、第２凸条１５６がウェッジワイヤー構造を構成するときは、エミッタ本体１２２の第２凸条１５６が配置されている各位置に仮凸条を有する中間成形体を成形して、上記仮凸条を塑性変形させて第２凸条１５６としてもよい。 Further, when the second ridge 156 constitutes a wedge wire structure, an intermediate molded body having temporary ridges is formed at each position where the second ridge 156 of the emitter body 122 is disposed, and the temporary protrusion is formed. The strip may be plastically deformed to form the second ridge 156.
　本出願は、２０１７年３月２７日出願の日本国出願番号２０１７－０６１６１９号に基づく優先権を主張する出願であり、当該出願の明細書、特許請求の範囲および図面に記載された内容は本出願に援用される。 This application claims priority based on Japanese Patent Application No. 2017-0661619 filed on Mar. 27, 2017, and the description, claims, and drawings of the application include the contents of this application. Incorporated into the application.
　本発明によれば、エミッタ製造時の、ウェッジワイヤー構造有するスクリーン部の破損が生じにくく、またエミッタ製造時のウェッジワイヤー構造の設計の自由度を高くして、たとえば灌漑用液体中の浮遊物が内部により侵入しにくいため滴下量の意図せぬ変動が生じにくく、かつ取水部の内部に入り込んだ水の圧力損失がより少ないエミッタを製造することが可能である。そのため、本発明によれば、長期の滴下を要する技術分野への上記エミッタの普及および当該技術分野のさらなる発展が期待される。 According to the present invention, when the emitter is manufactured, the screen portion having the wedge wire structure is not easily damaged, and the design of the wedge wire structure at the time of manufacturing the emitter is increased. It is possible to manufacture an emitter in which the amount of dripping is not likely to change unintentionally and the pressure loss of water entering the inside of the water intake portion is less because it is less likely to enter the inside. Therefore, according to the present invention, it is expected that the emitter will be spread to a technical field that requires long-term dripping, and further development of the technical field will be expected.
　１００　点滴灌漑用チューブ
　１１０　チューブ
　１１２　吐出口
　１２０　エミッタ
　１２０ａ　第１表面
　１２０ｂ　第２表面
　１２２　エミッタ本体
　１２４　フィルム
　１２６　ヒンジ部
　１３１　取水部
　１３２　第１接続溝
　１３３　第１減圧溝
　１３４　第２減圧溝
　１３５　第２接続溝
　１３６　流量減少部
　１３７　流路開閉部
　１３８　吐出部
　１４１　第１接続流路
　１４２　第１減圧流路
　１４３　第１流路
　１４４　第２減圧流路
　１４５　第２接続流路
　１４６　第２流路
　１５１　スクリーン部
　１５２　取水用貫通孔
　１５３　取水用凹部
　１５４　凸条
　１５５　第１凸条
　１５６　第２凸条
　１６１　流量減少用貫通孔
　１６２　凸部
　１６３　流路開閉用貫通孔
　１７１　流量減少用凹部
　１７２　第１弁座部
　１７３　連通溝
　１７４　吐出用貫通孔
　１７５　第１ダイヤフラム部
　１７６　第１接続孔
　１８１　流路開閉用凹部
　１８２　第２弁座部
　１８３　第２ダイヤフラム部
　１８４　第２接続孔
　１９１　吐出用凹部
　１９２　侵入防止部
　１９３　凸条部
　２２２　中間成形体
　２５５　仮凸条
　２５７　切込部
 
  100 Tube for drip irrigation 110 Tube 112 Discharge port 120 Emitter 120a First surface 120b Second surface 122 Emitter body 124 Film 126 Hinge portion 131 Water intake portion 132 First connection groove 133 First pressure reduction groove 134 Second pressure reduction groove 135 Second connection Groove 136 Flow reduction part 137 Flow path opening / closing part 138 Discharge part 141 First connection flow path 142 First pressure reduction flow path 143 First flow path 144 Second pressure reduction flow path 145 Second connection flow path 146 Second flow path 151 Screen part 152 Water intake through-hole 153 Water intake recess 154 Projection 155 First projecting strip 156 Second projecting strip 161 Flow reduction through-hole 162 Projection 163 Flow channel opening / closing through-hole 171 Flow rate decrease recess 172 First valve seat 173 Communication groove 174 Discharge through-hole 175 First diaphragm portion 176 First connection hole 18 DESCRIPTION OF SYMBOLS 1 Flow path opening / closing recessed part 182 2nd valve seat part 183 2nd diaphragm part 184 2nd connection hole 191 Discharge recessed part 192 Intrusion prevention part 193 Projection part 222 Intermediate molded object 255 Temporary projection 257 Notch part

Claims (5)

  1. 　灌漑用液体を流通させるチューブの内壁面であり、かつ前記チューブの内外を連通する吐出口に対応する位置に接合され、前記チューブ内の前記灌漑用液体を前記吐出口から定量的に前記チューブ外に吐出するためのエミッタの製造方法であって、
    　前記エミッタは、
    　互いに裏表の関係にある第１表面および第２表面を有するエミッタ本体の、前記第１表面側に設けられた、前記灌漑用液体を取り入れるための取水部と、
    　前記エミッタ本体の前記第２表面側に設けられた、前記吐出口に面して配置されたときに前記灌漑用液体を前記チューブの外部に吐出可能な吐出部と、
    　前記取水部および前記吐出部を繋ぎ、前記灌漑用液体を流通させる流路と、を有し、
    　前記取水部は、前記第１表面側において前記第２表面側よりも幅が広くなるように形成された複数の凸条が配列されたスクリーン部を有し、
    　前記製造方法は、
    　前記エミッタが有する前記凸条よりも高さが高い複数の仮凸条を、前記取水部の前記凸条が配置されるそれぞれの位置に有する、前記エミッタの中間成形体を作製する工程と、
    　前記複数の仮凸条を塑性変形させて前記複数の凸条を形成する工程と、
    　を含む、エミッタの製造方法。     It is an inner wall surface of a tube through which the irrigation liquid is circulated, and is joined to a position corresponding to a discharge port communicating between the inside and the outside of the tube, and quantitatively discharges the irrigation liquid in the tube from the discharge port. A method of manufacturing an emitter for discharging to
    The emitter is
    A water intake portion for taking in the irrigation liquid, provided on the first surface side of the emitter body having a first surface and a second surface that are in reverse relation to each other;
    A discharge part provided on the second surface side of the emitter body, and capable of discharging the irrigation liquid to the outside of the tube when arranged facing the discharge port;
    A channel for connecting the water intake unit and the discharge unit and circulating the irrigation liquid,
    The water intake portion has a screen portion on which a plurality of protrusions formed so as to be wider on the first surface side than on the second surface side are arranged,
    The manufacturing method includes:
    A step of producing an intermediate molded body of the emitter having a plurality of provisional ridges having a height higher than the ridges of the emitter at respective positions where the ridges of the water intake section are disposed;
    Forming the plurality of ridges by plastically deforming the plurality of provisional ridges;
    A method for manufacturing an emitter, comprising:
  2. 　前記中間成形体を作製する工程は、前記第１表面側の幅と前記第２表面側の幅が同一か、または前記第１表面側において前記第２表面側よりも幅が狭くなるように形成された複数の仮凸条を有する中間成形体を作製する工程である、請求項１に記載のエミッタの製造方法。 The step of producing the intermediate molded body is formed such that the width on the first surface side is the same as the width on the second surface side, or the width on the first surface side is narrower than that on the second surface side. The method for manufacturing an emitter according to claim 1, which is a step of manufacturing an intermediate formed body having a plurality of provisional ridges.
  3. 　前記中間成形体を作製する工程は、前記複数の凸条の配列方向に直交する方向に切込を設けた切込部を前記仮凸条の前記第１表面側の上端面に有する中間成形体を作製する工程である、請求項１または２に記載のエミッタの製造方法。 The step of producing the intermediate molded body includes an intermediate molded body having a cut portion provided with a cut in a direction perpendicular to the arrangement direction of the plurality of convex strips on the upper end surface of the temporary convex strip on the first surface side. The method of manufacturing an emitter according to claim 1, wherein
  4. 　前記エミッタは、前記第１表面に配置されて前記流路の流路壁の少なくとも一部を構成するフィルムをさらに有し、
    　前記凸条を形成する工程は、前記フィルムの圧着と一体的に行う、請求項１～３のいずれか１項に記載のエミッタの製造方法。     The emitter further includes a film disposed on the first surface and constituting at least a part of a channel wall of the channel,
    The method of manufacturing an emitter according to any one of claims 1 to 3, wherein the step of forming the ridge is performed integrally with the pressure bonding of the film.
  5. 　前記フィルムは、前記中間成形体を作製する工程において前記中間成形体と一体成形される、請求項４に記載のエミッタの製造方法。 The method for manufacturing an emitter according to claim 4, wherein the film is integrally formed with the intermediate molded body in the step of producing the intermediate molded body.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04211311A (en) * 1990-03-02 1992-08-03 Rodney Ruskin Pressure compensating type water- dripping device for irrigation
JP2004187685A (en) * 1997-10-14 2004-07-08 Hydro Plan Engineering Ltd Emitter unit
US20120305676A1 (en) * 2010-02-18 2012-12-06 Netafim, Ltd. Drip Irrigation Emitter
JP2016220578A (en) * 2015-05-28 2016-12-28 株式会社エンプラス Emitter and drip irrigation tube
JP2017042106A (en) * 2015-08-27 2017-03-02 株式会社エンプラス Emitter and drip irrigation tubes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6211890B2 (en) * 2013-01-24 2017-10-11 日本電信電話株式会社 Sound collector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04211311A (en) * 1990-03-02 1992-08-03 Rodney Ruskin Pressure compensating type water- dripping device for irrigation
JP2004187685A (en) * 1997-10-14 2004-07-08 Hydro Plan Engineering Ltd Emitter unit
US20120305676A1 (en) * 2010-02-18 2012-12-06 Netafim, Ltd. Drip Irrigation Emitter
JP2016220578A (en) * 2015-05-28 2016-12-28 株式会社エンプラス Emitter and drip irrigation tube
JP2017042106A (en) * 2015-08-27 2017-03-02 株式会社エンプラス Emitter and drip irrigation tubes

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