WO2019196661A1

WO2019196661A1 - Stainless steel heat exchanger, gas water heater and manufacturing method of heat exchanger

Info

Publication number: WO2019196661A1
Application number: PCT/CN2019/080056
Authority: WO
Inventors: 邱步; 周晓伟; 段清彬
Original assignee: 艾欧史密斯(中国)热水器有限公司
Priority date: 2018-04-11
Filing date: 2019-03-28
Publication date: 2019-10-17

Abstract

A stainless steel heat exchanger (100), a gas water heater, and a manufacturing method of the heat exchanger (100). The stainless steel heat exchanger (100) comprises: a mounting plate (3); a plurality of heat exchange tubes (4) fixedly connected to the mounting plate (3) by means of a first welding portion (8); a communicating structure having a communicating space (6), ends of two or more heat exchange tubes (4) being communicated with one another by means of the communicating space (6) to form a flow channel, and the communicating structure is connected to the mounting plate (3) and/or the heat exchange tubes (4); and an isolating portion configured to isolate the first welding portion (8) from the flow channel. According to the stainless steel heat exchanger (100), the gas water heater and the heat exchanger (100), the welding portion of the heat exchanger cannot be prone to being corroded, and the service life is prolonged.

Description

Stainless steel heat exchanger, gas hot water device and heat exchanger manufacturing method

Cross reference related reference

This application claims the application number of 201101820306.3 submitted on April 11, 2018 as "manufacturing method of stainless steel heat exchanger, gas hot water heater and heat exchanger" and application number 201820516383.1 as "heat exchanger and gas" The priority of the Chinese Patent Application for Hot Water Apparatus, the entire contents of which is incorporated herein by reference.

Technical field

The invention relates to the field of heat exchangers, in particular to a method for manufacturing a stainless steel heat exchanger, a gas hot water device and a heat exchanger.

Background technique

The gas water heater uses gas as a fuel, and the heat is transmitted to the cold water flowing through the heat exchanger through the combustion heating method to achieve a gas appliance for the purpose of preparing hot water. At present, the heat exchanger used in the gas water heater mainly comprises a surrounding frame, a plurality of fin-shaped heat exchange tubes disposed in the surrounding frame, and is disposed outside the surrounding frame to connect the ends of the heat exchange tubes to each other. "U" type joints, "U" type joints make all heat exchange tubes form a continuous flow path. However, during the processing, since each joint is separately brazed to the end of the heat exchange tube, the operation is complicated and time-consuming. As the use time prolongs, the problem of corrosion and water leakage occurs in the brazed joint, which reduces the service life of the heat exchanger.

In the prior art, there is also a heat exchanger structure that uses a water collecting box to communicate heat exchange tubes of a heat exchanger, and the heat exchange tubes are connected to form a flow passage through a sealing cover plate provided with a convex hull. The sealing cover is placed on the mounting plate on one side of the heat exchanger, and the heat exchange tube ports to be connected are connected through the connecting passage of the convex hull structure. However, the port position contact of the heat exchange tubes is also found during use. The brazed joint of water is easily damaged by corrosion and affects the service life of the heat exchanger.

Summary of the invention

After long-term research by the inventors, it is found that the material of the solder at the end welding portion of the heat exchange tube of the heat exchanger of the above type is different from the material of the heat exchanger itself, resulting in the welded portion (weld seam) and the heat exchange medium (water). When contacted, there is a potential difference between the two metal materials, which leads to electrochemical corrosion, especially in the case of stainless steel heat exchangers and the use of copper or nickel solder, the corrosion phenomenon is more prominent, with the use of welding for a long time The part is damaged by corrosion.

In addition, the heat exchanger in the gas water heater heats the water inside the heat exchange tube by heat exchange with the high temperature flue gas formed by the burner. After the user stops (such as stopping the use of hot water at the water end), the water in the heat exchange tube stops flowing, but the high temperature flue gas still exists in the gas water heater, and the high temperature flue gas will continue to heat the water staying in the heat exchange tube. The water in the heat exchange tube is in a static state, and the heat transferred by the high-temperature flue gas cannot be taken away, so that the water in the heat exchange tube is heated to an excessive temperature, and the welded portion is under the action of the excessive temperature water. It has accelerated the destruction of corrosion.

In order to solve the above problems, the present invention provides a method for manufacturing a stainless steel heat exchanger, a gas water heater, and a heat exchanger.

A stainless steel heat exchanger comprising:

Mounting plate

a plurality of heat exchange tubes; the heat exchange tubes are fixedly connected to the mounting plate by a first welding portion;

a communication structure having a communication space; the communication space connects two or more pipe ends of the heat exchange tubes to form a flow channel; the communication structure and the mounting plate and/or the heat exchange tube Connected

a partitioning portion that separates the first welded portion from the flow path.

Preferably, the partition portion includes a second welded portion that connects the mounting plate to the heat exchange tube; and the second welded portion is welded to the first welded portion in a different manner.

Preferably, the second welded portion is formed by laser welding or argon arc welding, and the first welded portion is formed by brazing.

Preferably, the brazing solder is copper or nickel.

Preferably, the communication structure is connected to the mounting plate and/or the heat exchange tube through a third welded portion.

Preferably, the communication structure includes a cover plate disposed on one side of the mounting plate; the cover plate is provided with a convex portion protruding in a direction away from the mounting plate, and located around the convex portion a second connecting portion; the inside of the convex portion forms the communication space; and the second connecting portion is connected to the mounting plate through the third welded portion to seal the periphery of the convex portion.

Preferably, the mounting plate has a first connecting portion sleeved outside the heat exchange tube; the first welding portion connects the first connecting portion with an outer wall of the heat exchange tube; The second weld portion is closer to the tube end of the heat exchange tube than the first weld portion to isolate the first weld portion from the flow passage.

Preferably, the first connecting portion extends in a direction away from the communicating structure; the first connecting portion is formed by a flange of a mounting hole on the mounting plate.

Preferably, the second welded portion is disposed around the heat exchange tube and seals between the flanged wall surface and the wall surface of the heat exchange tube.

Preferably, the first welded portion is formed between the flange and the wall of the heat exchange tube.

Preferably, the length of the second welded portion along the axial direction of the heat exchange tube is smaller than the length of the first welded portion.

Preferably, the second welded portion is formed by melting part of the mounting plate and/or a portion of the heat exchange tube.

Preferably, the second welded portion is formed by laser welding the tube end of the heat exchange tube.

Preferably, the third welded portion is formed by brazing, and a fourth welded portion is provided around the convex portion, and the fourth welded portion separates the third welded portion from the flow path.

Preferably, the fourth welded portion is melted by a part of the cover plate and/or the mounting plate.

Preferably, the first welded portion and/or the third welded portion are different from the material of the mounting plate and the heat exchange tube.

Preferably, the material of the partition portion is different from the first welded portion and the third welded portion.

Preferably, the first welded portion and the third welded portion are made of non-stainless steel, and the partition portion is made of stainless steel.

Preferably, the partition portion includes a waterproof coating applied to a surface of the first weld portion and/or the third weld portion exposed in the flow passage.

A gas hot water device comprising: a stainless steel heat exchanger as described above.

A method for manufacturing a heat exchanger, comprising:

Welding and sealing the outer wall of the heat exchange tube and the mounting portion of the mounting plate to form a welded portion;

A partition for isolating the welded portion from the water is provided between the outer wall of the heat exchange tube and the mounting portion.

Preferably, the partition is formed prior to the welded portion.

Preferably, the temperature at which the welded portion is formed is lower than the melting point of the heat exchange tube and the mounting plate.

Preferably, the heat exchange tube and the mounting plate are made of stainless steel.

Preferably, a portion of the heat exchange tubes and/or a portion of the mounting plate are melted to form the partition.

Preferably, the partition is formed by laser welding or argon arc welding.

Preferably, the welding method for forming the welded portion is different from the welding method for forming the insulating portion.

Preferably, the mounting portion includes a mounting hole formed on the mounting plate; and the manufacturing method of the heat exchanger includes:

Laser welding the tube end of the heat exchange tube into the mounting hole to form the partition.

Preferably, the welded portion is formed by brazing.

Preferably, the mounting hole is provided with a flange, and the brazing joint is formed between the flange and the outer wall of the heat exchange tube to sealingly connect the mounting plate with the heat exchange tube.

Beneficial effects:

The stainless steel heat exchanger provided by the present invention isolates the first welded portion from the flow channel by providing the partition portion, so that the first welded portion cannot directly contact the heat exchange medium (preferably water) in the flow channel, thereby The welded portion cannot be corroded by the heat exchange medium, so that the first welded portion between the heat exchange tube and the mounting plate can be effectively protected and the service life is prolonged.

At the same time, the isolation portion separates the first welded portion from the flow path, and even if the material of the first welded portion is different from the material of the mounting plate and the heat exchange tube, electrochemical corrosion cannot be formed, and the first welded portion cannot be corroded and destroyed. Effectively improve the service life of the welded joint between the heat exchange tube and the mounting plate.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the drawings, in which <RTIgt; It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in one or more other embodiments in the same or similar manner, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprises" or "comprising" or "comprising" or "comprising" or "comprising" or "comprises"

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and those skilled in the art can obtain other drawings according to the drawings without any inventive labor.

1 is a schematic structural view of a stainless steel heat exchanger according to an embodiment of the present invention;

Figure 2 is a partial split view of Figure 1;

Figure 3 is a schematic structural view of the partition of Figure 1;

4 is a schematic view showing the steps of a method for fabricating a heat exchanger according to an embodiment of the present invention.

detailed description

In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope should fall within the scope of the present invention.

It is to be noted that when an element is referred to as being "in" another element, it may be directly on the other element or the other element may be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or. The terms "vertical", "horizontal", "left", "right", and the like, as used herein, are for the purpose of illustration and are not intended to be the only embodiment.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Please refer to Figure 1 to Figure 3. The embodiment of the present invention provides a stainless steel heat exchanger 100, comprising: a mounting plate 3; a plurality of heat exchange tubes 4; the heat exchange tubes 4 are fixedly connected to the mounting plate 3 through the first soldering portion 8; a communication structure of 6; the communication space 6 communicates two or more pipe ends of the heat exchange tubes 4 to form a flow channel; the communication structure and the mounting plate 3 and/or the heat exchange The tubes 4 are connected to each other; the partition portion; the partition portion isolates the first solder portion 8 from the flow channel.

The stainless steel heat exchanger 100 provided in the present embodiment isolates the first welded portion 8 from the flow passage by providing the partition portion, so that the first welded portion 8 cannot directly contact the heat exchange medium (preferably water) in the flow passage. Therefore, the first welded portion 8 cannot be corroded by the heat exchange medium, so that the first welded portion 8 between the heat exchange tube 4 and the mounting plate 3 can be effectively protected to extend the service life.

At the same time, the isolation portion separates the first welded portion 8 from the flow path, and even if the material of the first welded portion 8 is different from the material of the mounting plate 3 and the heat exchange tube 4, electrochemical corrosion cannot be formed, so that the first welded portion 8 It cannot be damaged by corrosion, and effectively improves the service life of the welded portion between the heat exchange tube 4 and the mounting plate 3.

In addition, the partition portion separates the first welded portion 8 from the flow path, and even if the high temperature flue gas remaining in the heat exchanger after the shutdown stops, the water in the heat exchange tube 4 is heated to an excessive temperature, and the first welded portion 8 Since the presence of the partition cannot be in contact with water, it is also impossible to accelerate corrosion.

In an embodiment, the partition portion may be a coating structure, and the partition portion may be disposed on the surface of the first solder portion 8 exposed on the flow channel to prevent the first solder portion 8 from directly contacting the heat exchange medium in the flow channel. Preferably, the partition is formed by laser welding or argon arc welding.

In the present embodiment, the welded portion formed by brazing is separated from the water in the flow path by the second welded portion 7 formed by laser welding or argon arc welding. Since the laser welding and the argon arc welding are the second welded portions 7 formed by melting the base material of the stainless steel heat exchanger, the second welded portion 7 and the stainless steel heat exchanger itself have substantially the same material and have strong corrosion resistance. Further, the problem of corrosion damage caused by direct contact between the first welded portion 8 formed by brazing and water is avoided, and the service life of the heat exchanger is improved.

At the same time, the heat exchange tube 4 is mainly connected to the mounting plate 3 through the first welded portion 8, which reduces the requirement for the connection performance of the second welded portion 7, and only the second welded portion 7 can isolate the first welded portion 8 from the flow path. Just open.

In an embodiment, the partition portion may completely separate the first welded portion 8 from the flow path, or may isolate the portion of the first welded portion 8 from each other. Preferably, the isolating portion completely separates the first welded portion 8 from the flow path to ensure that the first welded portion 8 cannot come into contact with water to cause corrosion. The isolation portion and the first solder portion 8 may be in contact with each other, and the two may not be in contact with each other, and only the spacer portion may separate the first solder portion 8 from the flow channel.

In view of the fact that the heat exchange medium is usually water, the partition may also be a water barrier in some embodiments. The first welded portion 8 is separated from the water in the flow passage by the water blocking portion to prevent the first welded portion 8 from coming into contact with water. In a preferred embodiment, the spacers can sealingly connect the mounting plate 8 and the heat exchange tubes 4 while completely isolating the first welds 8 from the flow channels.

In order to separate the first weld portion 8 from the flow passage, the partition portion may be located on the side of the first weld portion 8 close to the flow passage to prevent the first weld portion 8 from coming into direct contact with the inside of the flow passage. As shown in FIG. 3, the partition portion is located on the side of the first welded portion 8 close to the communication structure.

In the embodiment shown in Figs. 1 and 2, the mounting plate 3 is located on one side of the heat exchanger 100, and the plurality of heat exchange tubes 4 are mounted on the mounting plate 3 in parallel with each other. The communication structure is provided on the outer side of each of the mounting plates 3 to form a plurality of heat exchange tubes 4 in series to form a flow path. The heat exchange tube 4 may be in the shape of a circular tube, and fins 9 for increasing the heat exchange area may be provided thereon. In the embodiment of the present application, the heat exchange tube 4 heats the internal heat exchange medium (preferably water) by heat exchange with the flue gas generated by the burner.

As shown in FIG. 3, the mounting plate 3 is provided with a plurality of flanged holes 10, a plurality of heat exchange tubes 4 are disposed in parallel, and the tube ends of the heat exchange tubes 4 are bored in the flanged holes 10. In order to isolate the first welded portion 8 from the flow path, the partition portion may have a circular ring shape to surround the tube end of the heat exchange tube 4.

In this embodiment, the partition portion includes a second welded portion 7 that connects the mounting plate 3 to the heat exchange tube 4. The second welding portion 7 and the first welding portion 8 are welded differently to form the second welded portion 7 and the first welded portion 8 of different materials. As a preferred solution, the second welded portion 7 may be formed by laser welding or argon arc welding. The first welded portion 8 is formed by brazing. Specifically, the brazing solder is copper or nickel.

In the present embodiment, the second welded portion 7 formed by laser welding or argon arc welding isolates the brazed portion from the water in the flow path, and the laser welding and the argon arc welding are formed by melting the base material of the stainless steel heat exchanger. The second welded portion 7 is such that the second welded portion 7 and the stainless steel heat exchanger itself have substantially the same material, which reduces the risk of electrochemical corrosion and has strong corrosion resistance, thereby avoiding the first welded portion formed by brazing. 8 Corrosion damage caused by direct contact with water improves the service life of the heat exchanger.

In the implementation, the second welding portion 7 may be formed by laser welding or argon arc welding in preference to the first welding portion 8 , and the heat exchange tube 4 and the mounting plate 3 are relatively fixed by the second welding portion 7 , and then The heat exchange tube 4 is positioned. A space for brazing solder filling is formed between the positioned heat exchange tubes 4 and the mounting plate 3, and the filled solder (such as copper or nickel) forms the first welded portion 8.

In an embodiment, the mounting plate 3 has a first connecting portion that is sleeved outside the heat exchange tube 4 . The first welded portion 8 connects the first connecting portion with an outer wall of the heat exchange tube 4. The second welded portion 7 is closer to the tube end of the heat exchange tube 4 than the first welded portion 8 to isolate the first welded portion 8 from the flow path.

Specifically, the first connecting portion extends in a direction away from the communicating structure; the first connecting portion is a flange of the flange hole 10 on the mounting board 3. By this flange, a fitting gap can be formed with the tube end of the heat exchange tube 4, and the fitting gap can be filled with solder to be brazed to form the first welded portion 8.

Similar to the first welded portion 8, in the present embodiment, the second welded portion 7 is disposed around the heat exchange tube 4, and seals between the flanged wall surface and the wall surface of the heat exchange tube 4. Specifically, the first welded portion 8 is formed between the flange and the wall of the heat exchange tube 4. At the same time, the second welded portion 7 is closer to the communication space 6 with respect to the first welded portion 8.

As shown in FIG. 3, the second welded portion 7 is located in the fitting gap between the flange and the heat exchange tube 4. The first welding portion 8 is located at the fitting gap to connect the heat exchange tube 4 with the flange, and the heat exchange tube 4 is sealingly connected to the mounting plate 3. The second welded portion 7 also connects the flange to the heat exchange tube 4, and may be formed prior to the first welded portion 8 to position the weld of the first welded portion 8. As shown in FIG. 3, the length of the second welded portion 7 in the axial direction of the heat exchange tube 4 is smaller than the length of the first welded portion 8.

In the embodiment, the material of the second welded portion 7 may be the same as or different from the material of the mounting plate 3 and the heat exchange tube 4 . In order to prevent the second welded portion 7 from being electrochemically corroded, the second welded portion 7 is protected from corrosion and the second welded portion 7 is preferably made of stainless steel.

In order to prevent electrochemical corrosion of the second welded portion 7 and ensure that the second welded portion 7 is not damaged, the material of the second welded portion 7 may be the same as that of the mounting plate 3 and the heat exchange tube 4. Specifically, the material of the second welded portion 7 may be stainless steel. The second welded portion 7 having a stainless steel material has better corrosion resistance. Further, the second welded portion 7 may be formed by melting part of the mounting plate 3 and/or a portion of the heat exchange tubes 4.

In order to facilitate the formation of the second welded portion 7, the second welded portion 7 may be formed by laser welding the tube end of the heat exchange tube 4 when the second welded portion 7 is formed by welding. Of course, the second welded portion 7 is not limited to being formed by the tube end of the heat exchange tube 4, but may be formed by laser welding the side wall of the heat exchange tube 4 or by laser welding of the mounting plate 3.

The second welded portion 7 formed by laser welding isolates the first welded portion formed by brazing from the water in the flow path, and since the laser welding is the second welded portion 7 formed by melting the base material, the second welded portion 7 It is basically consistent with the material of the stainless steel heat exchanger itself, which reduces the risk of electrochemical corrosion and has strong corrosion resistance, thereby avoiding the corrosion damage caused by the direct contact between the brazed part and the water, and improving the heat exchanger. The service life.

In the present embodiment, the communication structure may be mounted on the mounting plate 3 and connect the plurality of heat exchange tubes 4 through the communication space 6. The present application does not limit the shape of the communication space 6, and only needs to be able to connect the tube ends of the plurality of heat exchange tubes 4. A plurality of communication spaces 6 may be formed in the communication structure, and each of the communication spaces 6 is sealed from each other (not directly connected).

Specifically, the periphery of each of the communication spaces 6 may be sealingly connected to the mounting plate 3 such that the respective communication spaces 6 remain independent, so that the plurality of heat exchange tubes 4 are connected in series to form a heat exchange flow path. Wherein, the communication structure may be mounted on the mounting plate 3 by bolting and interposing a gasket, or may be in other forms such as riveting. As a preferred solution, the communication structure may be connected to the mounting plate 3 and/or the heat exchange tube 4 through a third welded portion.

In the embodiment shown in FIGS. 1 and 2, the communication structure includes a cover plate 1 disposed on one side of the mounting plate 3. The cover plate 1 is provided with a convex portion 2 protruding in a direction away from the mounting plate 3 and a second connecting portion located around the convex portion 2. The inside of the boss 2 forms the communication space 6. The second connecting portion is connected to the mounting plate 3 through the third welded portion to seal the periphery of the raised portion 2.

In this embodiment, the convex portion 2 of the communication structure can connect two or more heat exchange tubes 4 to each other. As shown in FIG. 2, in order to form a plurality of heat exchange tubes 4 in series to form a flow path, the tube ends of the two heat exchange tubes 4 communicate with the inside of a boss portion 2 (communication space 6).

Specifically, the third welded portion may be formed by brazing. In order to prevent the third welded portion from being corroded by water, a fourth welded portion 5 may be disposed around the raised portion 2. The fourth welded portion 5 isolates the third welded portion from the flow path. Wherein, the fourth welded portion 5 may be melt-formed by a part of the cover plate 1 and/or the mounting plate 3.

In the embodiment, the first welded portion 8 and the third welded portion may be formed by brazing for ease of manufacture and formation of a sealing structure between the heat exchange tube 4, the mounting plate 3, and the communication structure. The first welded portion 8 and/or the third welded portion are different in material from the mounting plate 3 and the heat exchange tube 4 .

In an embodiment, the material of the partition portion is different from the first welded portion 8 and the third welded portion. Specifically, the first welded portion 8 and the third welded portion are made of non-stainless steel, such as copper (including copper alloy) and nickel (including nickel alloy). The partition is made of stainless steel.

In an embodiment, the partition portion is not limited to the above-described weld bead structure formed by welding, and in one embodiment, the partition portion may include coating on the first weld portion 8 and/or the third weld portion. A water repellent coating that is exposed on the surface in the flow channel. The waterproof coating may be applied after the first weld portion 8 and/or the third weld portion are formed.

A gas water heater device is also provided in the embodiment of the present application, comprising: the stainless steel heat exchanger 100 of any of the above. The gas hot water device may include, but is not limited to, a gas water heater and a fireplace. Specifically, the gas hot water device may be provided with a burner (not shown), and the flue gas formed by the burner exchanges heat with the stainless steel heat exchanger 100 to heat the water in the stainless steel heat exchanger 100.

It should be noted that the combustion portion and other portions (for example, the control portion, the display portion) and the like of the gas water heater provided in the present embodiment may be any suitable existing configuration. In order to clearly and briefly explain the technical solutions provided by the present embodiment, the above-mentioned portions will not be described again, and the drawings are also simplified accordingly. However, it should be understood that the present embodiment is not limited in scope.

As shown in FIG. 4, a method for fabricating a heat exchanger is also provided in the embodiment of the present application. The method of making the heat exchanger can be used to make, but is not limited to, the stainless steel heat exchanger 100 of any of the above embodiments or examples. In this embodiment, the manufacturing method of the heat exchanger includes:

S1, welding and sealing the outer wall of the heat exchange tube 4 and the mounting portion of the mounting plate 3 to form a welded portion;

S2, a partition for isolating the welded portion from the water is provided between the outer wall of the heat exchange tube 4 and the mounting portion.

Steps S1 and S2 in the present embodiment are not limited in order of execution, and step S1 may be performed prior to step S2, that is, the welded portion is formed before the isolation portion. Step S2 may also be performed prior to step S1, that is, the isolation portion is formed prior to the solder portion.

In the step S1, the temperature at which the welded portion is formed is lower than the melting points of the heat exchange tubes 4 and the mounting plate 3. The soldering portion may be formed using solder, and the solder may be copper or nickel. Specifically, the welded portion is formed by brazing. Of course, the welding portion can also refer to the description of the welded portion in the stainless steel heat exchanger 100 of the above embodiment, or the first welded portion 8 and/or the third welded portion, which will not be further described herein.

In step S2, a portion of the heat exchange tubes 4 and/or a portion of the mounting plate 3 are melted to form the partition. Specifically, the partition is formed by laser welding or argon arc welding. The welding method for forming the welded portion may be different from the welding method for forming the insulating portion.

The mounting portion is a mounting hole formed in the mounting plate 3. Specifically, the mounting hole is a flange hole 10, and the welded portion formed by brazing is formed between the flange of the flange hole 10 and the outer wall of the heat exchange tube 4 to mount the mounting plate 3 It is sealingly connected to the heat exchange tube 4.

In the step S2, the separator is formed by laser welding the tube end of the heat exchange tube 4 into the mounting hole. Wherein, the partition formed by laser welding isolates the welded portion formed by brazing from the water in the flow channel, and since the laser welding is a partition formed by melting the base material, the material of the partition portion and the stainless steel heat exchanger itself is basically Consistent, it has strong corrosion resistance, which avoids the corrosion damage caused by direct contact between the brazed part and water, and improves the service life of the heat exchanger.

It should be noted that in the present embodiment, the mounting plate 3, the welded portion, the mounting hole, and the partition portion may be combined with the mounting plate 3 of the stainless steel heat exchanger 100 in the above embodiment, the welded portion (the first welded portion 8 and/or The descriptions of the third welding portion, the mounting hole, and the partition portion are referred to each other for reference, and will not be further described herein.

Any numerical value recited herein includes all values of the lower and upper values in increments of one unit from the lower limit to the upper limit, and at least two unit intervals between any lower value and any higher value. Just fine. For example, if the number of components or process variables (eg, temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate Values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly recited in the specification. For values less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be expressly stated, and all possible combinations of numerical values recited between the minimum and maximum values are considered to be explicitly described in this specification in a similar manner.

All ranges include endpoints and all numbers between the endpoints unless otherwise indicated. "About" or "approximately" as used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the indicated endpoints.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of" to describe a combination shall include the identified elements, components, components or steps and other elements, components, components or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "comprises" or "comprises" or "comprises" or "comprising" or "comprising" or "comprising" or "comprises" By using the term "may" herein, it is intended to mean that any of the attributes described as "may" are optional.

Multiple elements, components, components or steps can be provided by a single integrated element, component, component or step. Alternatively, a single integrated component, component, component or step may be divided into separate components, components, components or steps. The use of the <RTI ID=0.0> </ RTI> </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

It is to be understood that the above description is for the purpose of illustration and not limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art from this description. Therefore, the scope of the present invention should be determined by the scope of the appended claims The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference in its entirety for all purposes. Any aspect of the subject matter disclosed herein is omitted in the preceding claims, and is not intended to be a disclaimer of the subject matter, and the inventor is not considered to be a part of the disclosed inventive subject matter.

Claims

A stainless steel heat exchanger, comprising:

Mounting plate

a plurality of heat exchange tubes; the heat exchange tubes are fixedly connected to the mounting plate by a first welding portion;

a communication structure having a communication space; the communication space connects two or more pipe ends of the heat exchange tubes to form a flow channel; the communication structure and the mounting plate and/or the heat exchange tube Connected

a partitioning portion that separates the first welded portion from the flow path.
A stainless steel heat exchanger according to claim 1, wherein said partition portion includes a second welded portion that connects said mounting plate to said heat exchange tube; said second welded portion and said first welded portion The welding method is different.
A stainless steel heat exchanger according to claim 2, wherein said second welded portion is formed by laser welding or argon arc welding, and said first welded portion is formed by brazing.
A stainless steel heat exchanger according to claim 3, wherein said brazing solder is copper or nickel.
A stainless steel heat exchanger according to claim 1, wherein said communication structure is connected to said mounting plate and/or said heat exchange tube through a third welded portion.
A stainless steel heat exchanger according to claim 5, wherein said communication structure comprises a cover plate disposed on one side of said mounting plate; said cover plate being provided with a convex protrusion protruding away from said mounting plate a starting portion and a second connecting portion around the convex portion; an inner portion of the convex portion forms the communication space; and the second connecting portion is connected to the mounting plate through the third welded portion To seal the periphery of the raised portion.
A stainless steel heat exchanger according to claim 2 or 3 or 4, wherein said mounting plate has a first connecting portion that is sleeved outside said heat exchange tube; said first welded portion is said first a connecting portion is connected to an outer wall of the heat exchange tube; the second welded portion is closer to a tube end of the heat exchange tube than the first welded portion to connect the first welded portion with the The flow path is isolated.
A stainless steel heat exchanger according to claim 7, wherein said first connecting portion extends in a direction away from said communicating structure; said first connecting portion being formed by a flange of a mounting hole on said mounting plate.
A stainless steel heat exchanger according to claim 8, wherein said second welded portion is disposed around said heat exchange tube and seals between said flanged wall surface and a wall surface of said heat exchange tube.
A stainless steel heat exchanger according to claim 9, wherein said first welded portion is formed between said flange and said tube wall of said heat exchange tube.
A stainless steel heat exchanger according to claim 10, wherein a length of said second welded portion in the axial direction of said heat exchange tube is smaller than a length of said first welded portion.
A stainless steel heat exchanger according to claim 7, wherein said second welded portion is formed by melting said portion of said mounting plate and/or a portion of said heat exchange tube.
A stainless steel heat exchanger according to claim 12, wherein said second welded portion is formed by laser welding the tube end of said heat exchange tube.
A stainless steel heat exchanger according to claim 6, wherein said third welded portion is formed by brazing, and a fourth welded portion is provided around said convex portion, said fourth welded portion being said The third weld is isolated from the flow passage.
A stainless steel heat exchanger according to claim 14, wherein said fourth welded portion is melted by a portion of said cover plate and/or said mounting plate.
A stainless steel heat exchanger according to claim 5, wherein said first welded portion and/or said third welded portion are different in material from said mounting plate and said heat exchange tube.
A stainless steel heat exchanger according to claim 5, wherein said partition portion is made of a material different from said first welded portion and said third welded portion.
A stainless steel heat exchanger according to claim 17, wherein said first welded portion and said third welded portion are made of non-stainless steel, and said partition portion is made of stainless steel.
A stainless steel heat exchanger according to claim 5, wherein said partition portion comprises a waterproof coating applied to a surface of said first welded portion and/or said third welded portion exposed in said flow path Floor.
A gas hot water device, comprising: the stainless steel heat exchanger according to any one of claims 1-19.
A method for manufacturing a heat exchanger, comprising:

Welding and sealing the outer wall of the heat exchange tube and the mounting portion of the mounting plate to form a welded portion;

A partition for isolating the welded portion from the water is provided between the outer wall of the heat exchange tube and the mounting portion.
A method of manufacturing a heat exchanger according to claim 21, wherein said partitioning portion is formed prior to said welded portion.
A method of manufacturing a heat exchanger according to claim 21, wherein a temperature at which said welded portion is formed is lower than a melting point of said heat exchange tube and said mounting plate.
The method of manufacturing a heat exchanger according to claim 21, wherein said heat exchange tube and said mounting plate are made of stainless steel.
A method of manufacturing a heat exchanger according to claim 21, wherein a part of said heat exchange tubes and/or a portion of said mounting plates are melted to form said partition portion.
A method of manufacturing a heat exchanger according to claim 25, wherein said partition portion is formed by laser welding or argon arc welding.
A method of manufacturing a heat exchanger according to claim 21, wherein the welding means for forming the welded portion is different from the welding method for forming the insulating portion.
The method of manufacturing a heat exchanger according to claim 21, wherein the mounting portion comprises a mounting hole formed in the mounting plate; and the manufacturing method of the heat exchanger comprises:

Laser welding the tube end of the heat exchange tube into the mounting hole to form the partition.
A method of manufacturing a heat exchanger according to any one of claims 21 to 28, wherein the welded portion is formed by brazing.
A method of manufacturing a heat exchanger according to claim 29, wherein said mounting hole is provided with a flange, and said brazing joint is formed between said flange and said outer wall of said heat exchange tube to The mounting plate is sealingly connected to the heat exchange tube.