JP2001295793A - Axial blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axial blower capable of obtaining a high wind pressure with a small pressure loss, a low noise, and a small sized structure. SOLUTION: In the axial blower 10 having a rotor 11 rotationally driven by a motor 12, drawing air from the center and generating an air flow toward a perimeter by a centrifugal force, and an air duct 27 surrounding the rotor 11 and introducing the air flow from the perimeter of the rotor 11 to the axial direction of the rotor 11, a guide member 30 is provided for guiding an air flow from the perimeter of the rotor 11 to a side wall 26 of the air duct 27, while making the air flow turn in the direction of the revolution of the rotor 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial blower that can be made smaller and thinner, and more particularly to an axial blower that can be actively used in a small computer and its peripheral devices.

[0002]

2. Description of the Related Art As a blower using a small computer and its peripheral devices, an axial blower having a propeller fan therein is known. However, when the axial blower using this propeller fan is arranged in a storage case of a thin electronic device or the like, since the generated wind pressure is small, the blown air amount is extremely reduced, or in some cases, substantially. Becomes close to zero. In view of this, a blower for use in a vacuum cleaner or the like using a centrifugal fan having a relatively high pressure has been proposed in Japanese Patent Application Laid-Open No. H11-182485, but a diffuser is arranged around an impeller. Since it is difficult to integrally form the housing with the housing, an inexpensive small-sized axial-flow blower cannot be formed. On the other hand, Patent No. 29
No. 95928 proposes a blower in which a wind passage extending radially outward of an impeller (rotary body) driven and rotated by a motor is smoothly bent in the axial direction, and a diffuser is formed in the wind passage.

[0003]

However, in the blower disclosed in Japanese Patent No. 2995928, since the wind passage formed on the outside in the radial direction of the impeller is merely bent in the axial direction, the radius from the impeller is small. Since the airflow blown outward in the direction is bent through the radius of the corner of the wind passage, the circumferential momentum of the airflow blown from the radial outside of the impeller is extinguished, so that a problem that a higher pressure cannot be exerted. is there. In addition, the airflow blown from the radially outer side of the impeller immediately collides with the rounded corner at the corner of the wind passage, so that there is a problem that noise is increased. The present invention has been made in view of the above circumstances, and an object thereof is to provide an axial blower that can obtain a large wind pressure with a small pressure loss, further reduce noise, and can be configured to be smaller. Aim.

[0004]

According to the present invention, there is provided an axial-flow blower according to the present invention, which is driven by a motor to rotate, and that draws air from a central portion and generates an airflow toward a peripheral portion by centrifugal force. An airflow path surrounding the rotator and having an airflow that guides an airflow blown from an outer peripheral portion of the rotator in an axial direction of the rotator, wherein the outer peripheral portion of the rotator is provided on a side wall of the airflow passage. A guide member is provided for guiding the supplied airflow in the axial direction while rotating in the rotation direction of the rotating body. As described above, by providing the guide member that guides the air flow sent from the outer peripheral portion of the rotating body in the rotation direction of the rotating body in the axial direction while providing the air flow blown from the outer peripheral portion of the rotating body to the side wall of the ventilation path, Since the air can be sent in the axial direction while retaining the momentum, a higher-pressure airflow can be generated with less loss.

[0005] In the axial blower according to the present invention, it is preferable that the guide member is provided substantially parallel to the axial direction or inclined in the rotation direction of the rotating body.
Thus, the airflow blown from the outer periphery of the rotating body to the side wall of the ventilation path can be more efficiently sent in the axial direction while leaving the momentum of the airflow blown out of the rotating body. In the axial blower according to the present invention, it is preferable that the rotating body is a centrifugal fan having one of a forward wing, a radial wing, and a backward wing provided with a large number of wing members. Thereby, the compressed high-pressure airflow can be generated more efficiently. Further, in the blower of the present invention, it is preferable that the wing member is provided with a wind guide member that converts the gas flow in the axial direction into a radial direction of the rotating body. The escape of the compressed airflow in the axial direction can be reduced, and a high-pressure airflow can be generated more efficiently.

In the axial blower of the present invention, an annular plate connected to the motor of the rotating body is preferably provided, and the annular plate is preferably opened between the wing members. Since it is possible to flow the wind from anywhere, the blowing efficiency can be improved. Furthermore, in the axial blower of the present invention, it is preferable that the ventilation path is formed so as to increase its area in the axial direction, whereby the turbulence of the airflow flowing from the rotating body in the axial direction is reduced. Prevent and more efficiently convert dynamic pressure to static pressure. Here, in the axial blower of the present invention, a plurality of the guide members are provided, and an interval between the guide members is formed narrow at the start end in the axial direction and wide at the end end to reduce the area of the ventilation path. Preferably it increases. This makes it possible to further prevent the turbulence of the airflow flowing from the rotating body in the axial direction, and to more efficiently change the dynamic pressure to the static pressure. In the axial blower of the present invention, it is preferable that the area of the ventilation path is increased by expanding the ventilation path toward the airflow outlet side in the axial direction, thereby more efficiently reducing the dynamic pressure. It becomes possible to change to pressure. In the axial blower of the present invention, it is preferable that the ventilation path is formed integrally with a casing that encloses the rotating body, thereby reducing the manufacturing cost of parts for manufacturing the axial blower. I do. The ventilation path may have a draft angle at the time of integral molding.

Here, in the axial blower of the present invention,
The outer shape of the casing is quadrangular in plan view, and the outer wall of the cylindrical ventilation passage is substantially inscribed in the quadrangle at the airflow outlet end, and at the square corner, the outlet side. It is more preferable that the axial air blower is expanded toward the opening, whereby the installation space can be more effectively used and the axial flow blower can be reduced in size. In the axial blower of the present invention,
It is preferable to provide an annular member that covers at least a part of the blade member of the rotating body on the axial front side at an intake-side end of the airflow of the casing, whereby the blowing efficiency can be further improved. . In the axial blower of the present invention, a part or all of the guide member may be used as the support member of the mounting base that supports the rotating body, thereby omitting useless members. ,
The entire axial flow blower has a more functional structure. Further, in the axial blower of the present invention, the rotating body includes a first centrifugal fan of a forward wing provided with a large number of wing members, and a second centrifugal fan of a swept wing provided with a large number of wing members. It is preferable that the airflow blowout direction is changeable by changing the rotation direction of the motor. This makes it possible to reverse the air blowing direction, and the intake and exhaust can be performed by a single axial blower, so that it is possible to use the device in a device that requires not only intake but also exhaust.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a right side view of the axial blower according to the first embodiment of the present invention, and FIG.
FIG. 3 is a left side view of the coaxial blower, FIG. 4 is a perspective view of a casing of the coaxial blower, and FIG. 5 is an axial blower according to a second embodiment of the present invention. , FIG. 6 is a cross-sectional view taken along the line AA of FIG. 5, FIG. 7 is a right side view of the rotator, FIG. 8 is an operation comparison diagram of each axial blower, and FIG. FIG. 10 is a right side view of an axial blower according to a third embodiment of the present invention, FIG. 10 is a sectional view taken along the line AA of FIG. 9, and FIG. 11 is an axial blower according to a fourth embodiment of the present invention. FIG. 12 is a right side view of the apparatus, and FIG. 12 is a sectional view taken along the line AA of FIG.

As shown in FIGS. 1 to 4, an axial blower 10 according to a first embodiment of the present invention includes a centrifugal fan that draws air from a central portion and generates an airflow toward an outer peripheral portion by centrifugal force. A rotating body 11, a motor 12 inside the center of the rotating body 11 for rotating the rotating body 11, and a motor 1
2 and a casing 13 in the center of which the rotating body 11 is disposed. Hereinafter, these will be described in detail.

The rotating body (impeller) 11 is made of plastic (for example, PP, ABS, etc.) or metal having sufficient strength, and has a motor housing 14 in the center and a number of wing members 15 around the motor housing. ing. Each wing member 15 has an arch-shaped cross section and is arranged with a constant gap in the circumferential direction. The ratio of the inner and outer diameters is about 65 to 80%.
The structure is such that it becomes an advancing wing in the rotation direction of the rotating body 11 and can generate an airflow having a higher pressure. Here, the ratio of the inner and outer diameters of 65 to 80% refers to the ratio of the inner diameter to the outer diameter of the wing members arranged in the circumferential direction.
%, The area of the intake port becomes too small to increase the intake resistance, and if the inner / outer diameter ratio is greater than 80%, the degree of compression of the intake airflow by the rotating wing member decreases. Each wing member 15 is provided in the middle, and a main wing member 17 and a sub wing member 18 are separated by an intermediate baffle plate 16 which is an example of a baffle member that converts a gas flow in an axial direction into a radial direction of the rotating body 11. And each main wing member 17
A flat annular plate (hub) 19 is provided on the base side in the axial direction (P direction in FIG. 2), and is arranged with a certain interval in the circumferential direction. The intermediate baffle plate 16 is inclined downward in the radial direction, and the sub wing member 18 following the main wing member 17 lacks an inner portion thereof. Therefore,
In the rotating body 11, the air sucked from the central suction portion 20 is turned into a high-pressure airflow by the main wing members 17 that are vertically surrounded by the annular plate 19 and the intermediate baffle plate 16 and rotate at high speed. In addition to being discharged to the outside of the body 11, part of the air sucked from the upper side of the rotating body 11, that is, the open side, is discharged radially outward through the sub wing member 18.

Here, in this embodiment, the wing member 15 is a forward wing, but each wing member may be a radial fan (radial wing) extending linearly in the radial direction, or each wing member may be a blade. The member may be a swept wing that is bent rearward in the rotation direction. Further, in this embodiment, the planar annular plate 19 is provided in the entire area on the base side in the axial direction of each wing member 15, but may be a part or may be omitted in some cases. . Further, the shape of the annular plate can be inclined. Furthermore, the inclined intermediate air guide plate 16 provided at the intermediate portion of each wing member 15 is, in this embodiment,
It is provided over the entire area of each wing member 15, but may be a part or may be omitted in some cases. Further, the intermediate air guide plate may have a flat plate shape or a truncated cone shape. In this embodiment, an annular plate is not provided on the axial front side (upstream side) of each wing member 15, but a plane or inclined annular plate is provided on a part or all of the wing member 15. Can also.

A motor housing 12 provided at the center of the rotating body 11 is provided with a motor 12 serving as a rotation drive source of the rotating body 11. As the motor 12, for example, a motor having substantially the same structure as that described in JP-A-8-21396 can be used. As the motor 12 in this embodiment, a DC brushless motor is used, a plurality of permanent magnets provided inside the motor housing 14, a stator coil provided on the center shaft 21 corresponding to the permanent magnets, A bearing for rotatably supporting the center shaft 21 of the rotating body 11 including the motor housing portion 14 on the center fixing member 22, and applying a predetermined current to the stator coil to apply a driving force to the outer permanent magnet. To rotate the rotating body 11. The center fixing member 22 is a rotating body 1
A circuit board (not shown) which is fixed to a mounting base 23 supporting the motor 1 and constitutes a control device of the motor 12 is provided around the mounting base 23. In this embodiment, the motor 12 is of the interior type, but the motor 12 is of the exterior type in which the motor 12 is arranged outside the rotating body 11 or the motor is mounted on an extension of the rotating body 11 in the axial direction. It is also possible to use a double-shaft in-line type that shares the respective rotation axes.

As shown in FIG. 3, the mounting base 23
Are connected to the casing 13 by four plate-like support members 24. FIG. 4 shows a state where the support member 24 and the mounting base 23 are removed. The outer shape of the casing 13 is a square with rounded corners in plan view, and an opening 25 whose cross-sectional area gradually increases toward the base side in the axial direction. That is, as shown in FIG. 2, the rotating body 1 is provided in the opening 25 as described above.
1 is rotatably mounted via a motor 12 and a center fixing member 22 which supports the motor 12, and a ventilation passage 27 is formed in the axial direction of the rotating body 11 by an outer peripheral portion of the rotating body 11 and a side wall 26 around an opening 25. It is formed to increase its area. As described above, the ventilation passage 27 is formed integrally with the casing 13 surrounding the rotating body 11. This ventilation path 27
The side wall 26 is parallel to the outer surface 29 of the casing 13 in the region of the square central portion 28 in a plan view, and the end of the ventilation passage 27 on the airflow outlet side (coinciding with the direction P) is formed in the square shape. Although it is substantially inscribed (without taking into account the thickness), it expands toward the blowout side at the square corner,
7 gradually increases, thereby forming a ventilation passage 27 whose ventilation passage cross section increases from the entrance side to the exit side.

A spiral rib 3 which is an example of a plurality of guide members which are directed to the base side in the axial direction while turning the passing airflow in the rotation direction of the rotating body 11 is provided on the side wall 26 of the ventilation passage 27.
0 is provided. The spiral rib 30 is formed integrally with the casing 13. Therefore, the airflow (air) discharged from the outer peripheral portion of the rotating body 11 is partitioned by the spiral rib 30 to generate a spiral airflow in the ventilation passage 27 and blow the airflow downstream from the outlet 31. Further, the space between the spiral ribs 30 may be narrow at the start end in the axial direction of the rotating body 11 and wide at the end end to increase the area of the ventilation passage 27. As shown in FIG. 3, four of the spiral ribs 30 are connected to the support members 24 described above.
The spiral rib 30 is used for a part (or all) of the support member 24. The number of the spiral ribs 30 is 12, 14, or 16 in this embodiment, but can be increased or decreased according to the size of the axial blower 10.

Although the spiral rib 30 is formed in a spiral shape which is turned in the rotating direction of the rotating body 11, it is formed substantially parallel to the axial direction of the rotating body 11 or inclined in the rotating direction of the rotating body 11. It may have a rib shape. Strictly speaking, it is preferable that the shape of the spiral rib 30 be strictly wide and tapered toward the downstream side, thereby facilitating demolding. It is preferable in terms of strength that an appropriate radius is provided at a portion where the spiral rib 30 contacts the side wall 26 so that the spiral rib 30 contacts the side wall 26 smoothly. It can also be made to intersect substantially at right angles. At four corners of the casing 13, screw holes 32 for attaching the axial blower 10 to an object are provided. FIG. 8 shows an operation curve of the axial flow blower (new axial flow fan) 10, which is substantially the same size (80 mm × 8
The figure shows an example of comparison with other axial flow fans and sirocco fans having a shape of 0 mm × about 20 mm in thickness). In the axial blower 10, when the air volume is less than 0.4 m ³ / min, a pressure higher than that of other axial fans and sirocco fans can be obtained. When the load curve is indicated by a broken line, the intersection Q indicates the operating state of the axial blower 10.

Here, the casing 13 is not provided with a hood having an extended side wall on the intake side and the outlet side, but a side wall such as a hood may be provided on one or both sides. In this case, the inner side wall of the hood on the blow-out side may be provided with a spiral rib in addition to a straight structure. In this embodiment, the side wall 26 of the ventilation passage 27 is expanded, but may be straight. Further, in this embodiment, the mounting base 23 serving as a motor support plate is provided inside the air outlet 31, but a motor support plate may be provided on the intake side. A guide member for guiding the passage of the airflow can be provided on these motor support plates.

Next, a rotating body (impeller) 35 of an axial blower according to a second embodiment of the present invention will be described with reference to FIGS. The rotating body 35 has a large number of wing members 36 arranged in the circumferential direction.
The base side in the axial direction (R in FIG. 6) is an annular plate (hub)
37. The central portion of the annular plate 37 has a motor housing 3 similar to the axial blower 10.
8 are provided. A portion of the wing member 36 on the radial front side in the axial direction is supported by another annular plate (shroud) 39 to reinforce the wing member 36. An annular member 40 for reinforcing the connection of the wing member 36 is also provided on the radially outer side of the wing member 36 on the base side in the axial direction. Each wing member 36 forms a forward wing in the rotation direction of the rotating body 35, and the rotating body 35 itself forms an impeller of a sirocco fan. In the axial flow blower using the rotating body 35, a plurality or a number of spiral ribs are formed in a ventilation path between the inner side wall of the casing and the airflow generated from the rotating body 35 is positively increased. Since it is guided in the rotation direction of
The airflow sucked from the air inlet 41 and blown out by the wing members 36 is gradually changed in direction and dispersed by the spiral ribs, and the airflow resistance is reduced, resulting in a more efficient axial blower. The annular plate 37 connected to the motor of the rotating body 35 has an opening 42 opened between the wing members 36. This allows the air to flow from any of the openings 42, thereby improving the air blowing efficiency.

Next, an axial blower 43 according to a third embodiment of the present invention will be described with reference to FIGS. The members other than the changed parts are the same as those of the axial blower 10 according to the first embodiment, and therefore the same members are denoted by the same reference numerals and description thereof will be omitted. The axial blower 43 according to the third embodiment of the present invention
An annular cover 44 which is an example of an annular member that covers at least a part of the blade member 15 at the front end in the axial direction on the intake end of the airflow.
Is provided. Thereby, the blowing efficiency can be further improved.

Referring to FIGS. 11 and 12, a fourth embodiment of the present invention will be described.
The axial blower 45 according to the embodiment will be described. The members other than the changed parts are the same as those of the axial blower 10 according to the first embodiment, and therefore the same members are denoted by the same reference numerals and description thereof will be omitted. The axial blower 45 according to the fourth embodiment of the present invention includes a large number of wing members 46.
A first centrifugal fan 47 of a forward wing provided with a wing member and a second centrifugal fan 48 of a backward wing provided with a large number of wing members 48a are arranged substantially perpendicularly to the annular plate 49 and in series. The configuration is as follows. Therefore, by changing the rotation direction of the motor 12, the blowing direction of the airflow can be changed.

The present invention is not limited to the above embodiment, but includes the number and shape of the wing members of the rotating body, the annular plate provided on the base end side or the tip end side in the axial direction, the inclination thereof, and the mounting location. The mounting position and type of the motor for driving the rotating body can be freely selected. In addition, the casing is not limited to a square shape, but may be a round shape. Further, a cylindrical attachment or the like may be freely attached to the intake side or the outlet side.

[0021]

In the axial blower according to the first to thirteenth aspects, the airflow blown from the outer peripheral portion of the rotating body to the side wall of the ventilation path is guided in the axial direction while rotating in the rotating direction of the rotating body. Since the guide member is provided, the change in the flow direction of the airflow blown out from the rotating body can be reduced, and the airflow can smoothly flow in the axial direction. Accordingly, a large wind pressure can be obtained with a small pressure loss, and an efficient axial flow blower can be provided. Further, a plurality of guide members provided in the ventilation path for the airflow blown out from the rotating body disperse and rectify the generated sound, so that a further reduction in noise can be expected.

[Brief description of the drawings]

FIG. 1 is a right side view of an axial blower according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a left side view of the coaxial air blower.

FIG. 4 is a perspective view of a casing of the coaxial blower.

FIG. 5 is a left side view of a rotating body of an axial blower according to a second embodiment of the present invention.

FIG. 6 is a sectional view taken along the line AA of FIG. 5;

FIG. 7 is a right side view of the rotating body.

FIG. 8 is an operation comparison diagram of each axial blower.

FIG. 9 is a right side view of an axial blower according to a third embodiment of the present invention.

FIG. 10 is a sectional view taken along the line AA of FIG. 9;

FIG. 11 is a right side view of an axial blower according to a fourth embodiment of the present invention.

FIG. 12 is a sectional view taken along the line AA of FIG. 11;

[Explanation of symbols]

10: axial blower, 11: rotating body, 12: motor, 1
3: casing, 14: motor housing, 15: wing member,
16: intermediate air guide plate, 17: main wing member, 18: sub wing member,
19: annular plate, 20: intake section, 21: central axis, 22: intermediate fixing member, 23: mounting base, 24: support member, 2
5: Opening, 26: Side wall, 27: Ventilation path, 28: Central part, 29: Outside surface, 30: Spiral rib (guide member), 3
1: outlet, 32: screw hole, 35: rotating body, 36: wing member, 37: annular plate, 38: storage section, 39: annular plate, 4
0: annular member, 41: intake port, 42: opening, 43: axial blower, 44: annular cover (annular member), 45: axial blower, 46: blade member, 47: first centrifugal fan ,
48: second centrifugal fan, 48a: wing member, 49: annular plate

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H033 AA02 AA13 BB02 BB06 BB20 CC02 DD03 DD05 DD06 DD09 DD12 EE06 EE19 3H034 AA02 AA13 BB02 BB06 CC03 DD07 EE06 EE12 EE18

Claims (13)

[Claims] 1. A rotating body which is driven to rotate by a motor and generates airflow which is taken in from a central portion and directed toward an outer peripheral portion by centrifugal force, and an airflow which surrounds the rotating body and is supplied with air from the outer peripheral portion of the rotating body. In the axial blower having an air passage that guides the rotating body in the axial direction, a guide member that guides the air flow sent from the outer peripheral portion of the rotating body in the axial direction is provided on a side wall of the ventilation path. An axial flow blower characterized by the following. 2. The axial blower according to claim 1, wherein
The axial flow blower, wherein the guide member is provided substantially parallel to the axial direction or inclined in the rotational direction of the rotating body. 3. The axial blower according to claim 1, wherein the rotating body is a centrifugal fan having one of a forward wing, a radial wing, and a backward wing provided with a large number of wing members. Axial blower. 4. The axial blower according to claim 3, wherein
An axial flow blowing device, wherein the wing member is provided with a wind guide member for converting the flow of the gas in the axial direction into a radial direction of the rotating body. 5. The shaft blower according to claim 3, further comprising an annular plate connected to a motor of the rotating body, wherein the annular plate is open between the wing members. Flow blower. 6. The axial flow blowing device according to claim 1, wherein the ventilation path is formed so as to increase its area in the axial direction. Blower. 7. The axial blower according to claim 6, wherein
A plurality of the guide members are provided, and an interval between the guide members is formed narrow at a start end portion in the axial direction and wide at an end portion in the axial direction, thereby increasing an area of the ventilation passage. 8. The axial blower according to claim 6, wherein
The axial flow blowing device is characterized in that an area of the ventilation passage is increased by expanding the ventilation path toward the airflow blowing side in the axial direction. 9. The axial flow blower according to claim 6, wherein the ventilation path is formed integrally with a casing surrounding the rotating body. Blower. 10. The axial flow blower according to claim 9, wherein an outer shape of the casing is quadrangular in a plan view, and an outer wall of the cylindrical ventilation passage is formed at an end of the airflow at a blowout side of the airflow. An axial flow blower substantially inscribed in a quadrangular shape and expanding at a square corner toward the blowout side. 11. The axial flow blower according to claim 9, wherein an end of the casing on an intake side of the airflow is provided with:
An axial blower, comprising: an annular member that covers at least a part of the blade body of the rotating body on the axial front side. 12. The axial flow blower according to claim 1, wherein a part or the whole of the guide member also serves as a support member of a mounting base for supporting the rotating body. An axial flow blower characterized by the above-mentioned. 13. The axial blower according to claim 3, wherein the rotating body includes a first centrifugal fan of a forward wing provided with a plurality of wing members, and a plurality of wing members. An axial-flow blower, wherein a second centrifugal fan of a swept wing provided with a series is provided in series, and a blowing direction of the airflow can be changed by changing a rotation direction of the motor. .