Pressure reducing valve, heat exchanger, air conditioning device, and method for manufacturing heat exchanger

Abstract

The pressure reducing valve (50) includes a valve body (51), a joint pipe (52) having one end connected to the valve body (51), and a connecting member (53) connected to the other end of the joint pipe (52) by welding. The joint pipe (52) is made of a metal other than aluminum. The connecting member (53) is made of aluminum or an aluminum alloy.

Description

Technical Field

[0001] The present disclosure relates to a pressure reducing valve, a heat exchanger, an air conditioning device, and a method for manufacturing the heat exchanger. Background Art

[0002] In heat exchangers used in air conditioners, the price of copper, which is a raw material, continues to rise, so aluminum heat transfer tubes, refrigerant pipes, etc. are beginning to be used. In addition, in order to enable reheat dehumidification, heat exchangers including dehumidification valves are being developed.

[0003] Patent Document 1 describes that when a solenoid valve is mounted on a heat exchanger, a joint pipe of the solenoid valve is made of stainless steel to prevent electrolytic corrosion from occurring at a connection portion between the joint pipe and an aluminum refrigerant pipe.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Publication No. 2013-185790 Summary of the invention

[0007] -Technical problem to be solved by the invention-

[0008] However, in the structure of Patent Document 1, since the thermal conductivity of stainless steel is low, when the joint pipe and the refrigerant pipe are joined by brazing, it is difficult to uniformly heat the brazed portion in flame brazing, which may cause a poor joining.

[0009] An object of the present disclosure is to suppress the occurrence of joint failure when a refrigerant pipe made of aluminum is brazed to a joint pipe made of a metal other than aluminum in a pressure reducing valve.

[0010] -Technical solutions to solve technical problems-

[0011] The first aspect of the present disclosure is a pressure reducing valve 50, which includes a valve body 51, a joint pipe 52, and a connecting component 53, wherein one end of the joint pipe 52 is connected to the valve body 51, and the connecting component 53 is connected to the other end of the joint pipe 52 by welding. The joint pipe 52 is made of metal other than aluminum. The connecting component 53 is made of aluminum or an aluminum alloy.

[0012] In the first aspect, an aluminum connection member 53 is welded to the top end of the joint pipe 52 made of a metal other than aluminum. Therefore, when the aluminum refrigerant pipe 36 is connected to the joint pipe 52, the refrigerant pipe 36 can be brazed to the aluminum connection member 53. As a result, since the brazing property is improved, the occurrence of poor joining can be suppressed.

[0013] According to a second aspect of the present disclosure, in addition to the first aspect, the length of the connecting component 53 in the tube axis direction of the joint tube 52 is 5 mm or less.

[0014] In the second aspect, the brazed portion between the connection member 53 and the refrigerant pipe 36 can be shortened.

[0015] According to a third aspect of the present disclosure, in addition to the first or second aspect, a distance from the connecting member 53 to the valve body 51 is greater than or equal to 15 mm.

[0016] In the third aspect, the heat generated when the connection member 53 is welded to the joint pipe 52 is unlikely to affect the valve body 51 .

[0017] According to a fourth aspect of the present disclosure, in addition to any one of the first to third aspects, the joint pipe 52 is made of copper or a copper alloy and is coated with a coating film.

[0018] In the fourth aspect, it is possible to suppress the occurrence of electrolytic corrosion at the connection portion between the joint pipe (52) and the refrigerant pipe (36).

[0019] According to a fifth aspect of the present disclosure, in addition to any one of the first to third aspects, the joint pipe 52 is made of stainless steel.

[0020] In the fifth aspect, it is possible to suppress the occurrence of electrolytic corrosion at the connection portion between the joint pipe (52) and the refrigerant pipe (36).

[0021] The sixth aspect of the present disclosure is a heat exchanger 30, which includes: a pressure reducing valve 50 of any one of the first to fifth aspects; a heat transfer tube 35, the heat transfer tube 35 is made of aluminum or an aluminum alloy; and a refrigerant pipe 36, the refrigerant pipe 36 is connected to the heat transfer tube 35 and is made of aluminum or an aluminum alloy, and the refrigerant pipe 36 is brazed on the connecting part 53 of the pressure reducing valve 50.

[0022] In the sixth aspect, in the pressure reducing valve 50, the aluminum connection member 53 is welded to the top end of the non-aluminum joint pipe 52. Therefore, the aluminum refrigerant pipe 36 can be brazed to the aluminum connection member 53. As a result, since the brazing property is improved, the occurrence of poor joining can be suppressed. As a result, the reliability of the heat exchanger 30 is improved.

[0023] According to a seventh aspect of the present disclosure, based on the sixth aspect, a plurality of refrigerant pipes 36 are provided, and the plurality of refrigerant pipes 36 are connected to the pressure reducing valve 50 via a diversion portion 37 .

[0024] In the seventh aspect, by brazing the aluminum diverter portion 37 to the aluminum connection member 53 , the brazing property can be improved and the occurrence of joining failure can be suppressed.

[0025] An eighth aspect of the present disclosure is an air conditioning apparatus including the heat exchanger 30 of the sixth or seventh aspect.

[0026] In the eighth aspect, in the pressure reducing valve 50 provided in the heat exchanger 30, the aluminum connection member 53 is welded to the top end of the non-aluminum joint pipe 52. Therefore, the aluminum refrigerant pipe 36 can be brazed to the aluminum connection member 53. As a result, the brazing property can be improved and the occurrence of joint failure can be suppressed, so the reliability of the air conditioning device 10 is improved.

[0027] The ninth aspect of the present disclosure is a method for manufacturing a heat exchanger 30. The heat exchanger 30 includes a pressure reducing valve 50, a heat transfer tube 35 and a refrigerant pipe 36, wherein the heat transfer tube 35 is made of aluminum or an aluminum alloy, and the refrigerant pipe 36 is connected to the heat transfer tube 35 and is made of aluminum or an aluminum alloy. The pressure reducing valve 50 includes a valve body 51, a joint pipe 52 and a connecting component 53, wherein one end of the joint pipe 52 is connected to the valve body 51, and the connecting component 53 is connected to the other end of the joint pipe 52 by welding, wherein the joint pipe 52 is made of a metal other than aluminum, and the connecting component 53 is made of aluminum or an aluminum alloy. In the method for manufacturing the heat exchanger 30, the refrigerant pipe 36 and the connecting component 53 of the pressure reducing valve 50 are connected by brazing.

[0028] In the ninth aspect, in the pressure reducing valve 50, the aluminum connection member 53 is welded to the top end of the non-aluminum joint pipe 52. Therefore, the brazing property is improved by brazing the aluminum refrigerant pipe 36 to the aluminum connection member 53. As a result, since the occurrence of poor joining can be suppressed, the reliability of the heat exchanger 30 is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a piping system diagram showing a schematic structure of an air conditioning device according to an embodiment;

[0030] Figure 2 is a diagram showing the flow of refrigerant in a heat exchanger according to an embodiment;

[0031] Figure 3 is a perspective view showing a state of connection between a pressure reducing valve and a refrigerant pipe according to an embodiment;

[0032] Figure 4 is a schematic diagram showing a simplified structure of a pressure reducing valve according to an embodiment;

[0033] Figure 5 is a cross-sectional view showing an example of a connecting member provided on the pressure reducing valve according to the embodiment;

[0034] Figure 6 It is a perspective view showing a state in which the pressure reducing valve and the refrigerant pipe are connected via a flow dividing portion in a modified example. DETAILED DESCRIPTION

[0035] (Implementation Method)

[0036] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings. It should be noted that the present disclosure is not limited to the embodiments shown below, and various changes can be made without departing from the technical concept of the present disclosure. Each of the accompanying drawings is used to briefly illustrate the present disclosure, so in order to facilitate understanding, the size, ratio or quantity may be exaggerated or simplified as needed.

[0037] <Air conditioning unit>

[0038] like Figure 1 As shown, the air conditioning device 10 of this embodiment includes an outdoor unit 11 and an indoor unit 13. The outdoor unit 11 accommodates an outdoor circuit 20 and an outdoor fan 12. The indoor unit 13 accommodates an indoor heat exchanger 30 and an indoor fan 14. The outdoor unit 11 and the indoor unit 13 are connected to each other via a liquid side connecting pipe 16 and a gas side connecting pipe 17, thereby forming a refrigerant circuit 15. That is, the air conditioning device 10 is a refrigeration cycle device.

[0039] [Outdoor unit]

[0040] The outdoor circuit 20 is provided with a compressor 25, a four-way reversing valve 26, an outdoor heat exchanger 27, and an expansion valve 28. In the outdoor circuit 20, the discharge pipe and the suction pipe of the compressor 25 are connected to the four-way reversing valve 26. The gas side end 22 of the outdoor circuit 20 is connected to the four-way reversing valve 26. In the outdoor circuit 20, the expansion valve 28 and the outdoor heat exchanger 27 are arranged in sequence from the liquid side end 21 of the outdoor circuit 20 toward the four-way reversing valve 26.

[0041] One end of the liquid-side connecting pipe 16 is connected to the liquid-side end 21 of the outdoor circuit 20 , and one end of the gas-side connecting pipe 17 is connected to the gas-side end 22 of the outdoor circuit 20 .

[0042] The compressor 25 is a fully enclosed compressor. The outdoor heat exchanger 27 is a heat exchanger for exchanging heat between the refrigerant in the refrigerant circuit 15 and the outdoor air. The expansion valve 28 is a so-called electronic expansion valve. The four-way reversing valve 26 is a reversing valve for switching between cooling operation and heating operation.

[0043] [Indoor unit]

[0044] The indoor heat exchanger 30 includes a first unit 31A, a second unit 31B and a pressure reducing valve 50. The first unit 31A and the second unit 31B are connected via a refrigerant pipe 36 provided with a pressure reducing valve 50. The first unit 31A and the second unit 31B are so-called cross-fin heat exchangers, which allow the refrigerant in the refrigerant circuit 15 to exchange heat with the indoor air. The pressure reducing valve 50 can be an electric valve or a solenoid valve. The pressure reducing valve 50 switches between a fully open state and a state with a reduced opening. One end of the gas side pipe 33 is connected to the first unit 31A, and one end of the liquid side pipe 32 is connected to the second unit 31B. The other end of the liquid side pipe 32 is connected to the other end of the liquid side connecting pipe 16, and the other end of the gas side pipe 33 is connected to the other end of the gas side connecting pipe 17.

[0045] [Operation of air conditioner]

[0046] The air conditioner 10 selectively performs cooling operation and heating operation. In each of the cooling operation and the heating operation, the air conditioner 10 circulates the refrigerant in the refrigerant circuit 15 to perform a refrigeration cycle.

[0047] In the refrigeration operation, the four-way reversing valve 26 becomes Figure 1 In the state shown by the solid line, the outdoor heat exchanger 27 functions as a condenser and the indoor heat exchanger 30 functions as an evaporator. Specifically, by reducing the opening of the expansion valve 28 and fully opening the pressure reducing valve 50, the first unit 31A and the second unit 31B function as evaporators. The indoor unit 13 cools the indoor air sucked in by the first unit 31A and the second unit 31B of the indoor heat exchanger 30, and blows the cooled indoor air into the room.

[0048] In heating operation, the four-way reversing valve 26 becomes Figure 1 In the state shown by the middle dotted line, the indoor heat exchanger 30 functions as a condenser, and the outdoor heat exchanger 27 functions as an evaporator. Specifically, by reducing the opening of the expansion valve 28 and fully opening the pressure reducing valve 50, the first unit 31A and the second unit 31B function as condensers. The indoor unit 13 heats the indoor air sucked in by the first unit 31A and the second unit 31B of the indoor heat exchanger 30, and blows the heated indoor air into the room.

[0049] In the reheat dehumidification operation, the four-way reversing valve 26 becomes Figure 1In the state shown by the solid line, the outdoor heat exchanger 27 functions as a condenser, and a part of the indoor heat exchanger 30 functions as an evaporator. Specifically, by fully opening the expansion valve 28 and reducing the opening of the pressure reducing valve 50, the first unit 31A functions as an evaporator, and the second unit 31B functions as a condenser. The indoor unit 13 dehumidifies the indoor air sucked in in the first unit 31A of the indoor heat exchanger 30, and blows the dehumidified indoor air into the room.

[0050] <Heat exchanger>

[0051] Reference Figure 2 The indoor heat exchanger 30 (hereinafter sometimes simply referred to as the heat exchanger 30) will be described. Figure 2 In the figure, the hollow arrows represent the flow of air, the solid arrows represent the flow of the refrigerant during heating, and the dotted arrows represent the flow of the refrigerant during cooling.

[0052] exist Figure 2 In the heat exchanger 30 shown, the first unit 31A and the second unit 31B each have a plurality of fins 34 and a plurality of heat transfer tubes 35. The plurality of heat transfer tubes 35 have grooves on the inner surface of the tubes. The first unit 31A and the second unit 31B are configured by arranging a plurality of rows of heat exchange parts along the flow direction of air flowing between the plurality of fins 34, and the heat exchange parts are formed by inserting a plurality of heat transfer tubes 35 through the plurality of fins 34. The first unit 31A and the second unit 31B are connected via a refrigerant pipe 36 provided with a pressure reducing valve 50. The pressure reducing valve 50 is provided to make the first unit 31A function as an evaporator and the second unit 31B function as a condenser during reheat dehumidification.

[0053] The heat transfer tube 35 is a part of the refrigerant circuit 15, and the refrigerant flows inside the heat transfer tube 35. The heat transfer tube 35 transfers the heat of the refrigerant flowing inside to the air flowing outside via the fins 34. Thus, the heat transfer area of ​​the contact surface with the air is expanded, thereby promoting heat exchange between the refrigerant and the air.

[0054] The fins 34 , the heat transfer tubes 35 , and the refrigerant pipes 36 are made of aluminum or an aluminum alloy.

[0055] <Pressure reducing valve>

[0056] like Figure 3 As shown, the pressure reducing valve 50 includes a valve body 51 and a joint pipe 52, one end of which is connected to the valve body 51. The joint pipe 52 may be formed integrally with the valve body 51. Alternatively, the joint pipe 52 formed separately from the valve body 51 may be mounted on the valve body 51 by welding or the like.

[0057] The joint pipe 52 includes a first joint pipe 52A and a second joint pipe 52B. The first joint pipe 52A is connected to one of the first unit 31A and the second unit 31B through the refrigerant pipe 36, and the second joint pipe 52B is connected to the other of the first unit 31A and the second unit 31B through the refrigerant pipe 36.

[0058] The joint pipe 52 is made of a metal other than aluminum. Specifically, the metal other than aluminum is copper or a copper alloy, or stainless steel. When the joint pipe 52 is made of copper or a copper alloy, the surface of the joint pipe 52 is coated with a coating film made of, for example, an anticorrosive coating material.

[0059] <Connection between pressure reducing valve and refrigerant pipe>

[0060] Figure 4 FIG. 5 shows a schematic structure in which the pressure reducing valve 50 is constituted by a solenoid valve. Figure 4 In the pressure reducing valve 50 shown, the valve body 51 mainly includes a refrigerant flow path 51a, a valve body 51b, a moving iron core 51c, a stationary iron core 51d and an electromagnetic coil 51e. The refrigerant flow path 51a connects the pipeline of the first joint pipe 52A with the pipeline of the second joint pipe 52B. The valve body 51b opens and closes the refrigerant flow path 51a. The moving iron core 51c is configured to be movable together with the valve body 51b. The moving iron core 51c is composed of an iron core. The stationary iron core 51d is fixedly arranged on the side opposite to the valve body 51b across the moving iron core 51c. The electromagnetic coil 51e is arranged to surround the moving iron core 51c and the stationary iron core 51d, and controls the movement of the moving iron core 51c.

[0061] Specifically, the moving iron core 51c is urged upward (toward the stationary iron core 51d side) by a coil spring (not shown), and when the electromagnetic coil 51e is not energized, the moving iron core 51c is located upward together with the valve body 51b to open the valve. When the electromagnetic coil 51e is energized, an electromagnetic force is generated, and the moving iron core 51c moves downward together with the valve body 51b under the action of the electromagnetic force, and the valve body 51b sits on the valve seat 51f to close the valve. A tiny groove (not shown) is provided on the valve seat 51f, and the refrigerant flows through the groove when the valve is closed.

[0062] like Figure 4 As shown, the pressure reducing valve 50 has a connection member 53 at the top end of the joint pipe 52 (the end opposite to the valve body 51b), and the refrigerant pipe 36 is brazed to the connection member 53. The connection member 53 is made of aluminum or an aluminum alloy and is welded to the joint pipe 52.

[0063] like Figure 5 As shown, the connection member 53 may be formed in a bushing shape and inserted into the front end portion of the joint pipe 52 . Figure 5 (a) shows the cross-sectional structure of the connecting member 53 before being inserted into the joint pipe 52, Figure 5 (b) shows the cross-sectional structure of the connecting member 53 and its surroundings after being inserted into the joint pipe 52. Figure 5 In the case of the connecting member 53 shown in (a), Figure 5 As shown in (b), the refrigerant pipe 36 is inserted into the connection member 53 and brazed to the connection member 53.

[0064] The length of the connection member 53 (the length along the tube axis direction of the joint tube 52) may be approximately 5 mm or less. The distance from the connection member 53 to the valve body 51 (valve body 51b) may be approximately 15 mm or more.

[0065] <Method for manufacturing heat exchanger>

[0066] When manufacturing the heat exchanger 30, first prepare the pressure reducing valve 50 of this embodiment. The pressure reducing valve 50 includes a valve body 51, a joint pipe 52, and a connecting member 53. One end of the joint pipe 52 is connected to the valve body 51, and the connecting member 53 is connected to the other end of the joint pipe 52 by welding. The joint pipe 52 is made of a metal other than aluminum, and the connecting member 53 is made of aluminum or an aluminum alloy. The pressure reducing valve 50 can be purchased from a supplier, or can also be manufactured by itself.

[0067] Then, if Figure 4 and Figure 5 As shown, the refrigerant pipe 36 and the connection member 53 of the pressure reducing valve 50 are connected by brazing. Thus, since the refrigerant pipe 36 made of aluminum is brazed to the connection member 53 made of aluminum, the brazing property is improved.

[0068] <Features of the embodiment>

[0069] The pressure reducing valve 50 of this embodiment includes a valve body 51, a joint pipe 52, and a connecting component 53. One end of the joint pipe 52 is connected to the valve body 51, and the connecting component 53 is connected to the other end of the joint pipe 52 by welding. The joint pipe 52 is made of metal other than aluminum, and the connecting component 53 is made of aluminum or an aluminum alloy.

[0070] According to the pressure reducing valve 50 of this embodiment, when the aluminum refrigerant pipe 36 is connected to the joint pipe 52, the refrigerant pipe 36 can be brazed to the aluminum connecting member 53. Therefore, since the brazing property is improved, the occurrence of poor joining can be suppressed. As a result, the reliability of the pressure reducing valve 50 is improved.

[0071] Furthermore, according to the pressure reducing valve 50 of the present embodiment, since the joint pipe 52 made of dissimilar metals can be prevented from contacting the refrigerant pipe 36 by the connecting member 53 , corrosion caused by contact between dissimilar metals can be suppressed.

[0072] Furthermore, according to the pressure reducing valve 50 of the present embodiment, since it is possible to join to the refrigerant pipe 36 made of various forms of aluminum by, for example, flame (torch) brazing, the joining can be performed at low cost.

[0073] In addition, according to the pressure reducing valve 50 of this embodiment, the aluminum connecting member 53 is joined to the joint pipe 52 by welding without using brazing material. Therefore, when the aluminum refrigerant pipe 36 is brazed to the connecting member 53, it is possible to suppress the joint portion between the connecting member 53 and the joint pipe 52 from melting again.

[0074] In contrast, as in the prior art, when a valve having a copper joint pipe is installed on an aluminum refrigerant pipe, corrosion caused by contact between dissimilar metals becomes a problem. In addition, as disclosed in Patent Document 1, when a valve having a stainless steel joint pipe is installed on an aluminum refrigerant pipe, when aluminum brazing filler metal is applied to the joint pipe, the cost of applying the brazing filler metal to the valve will increase. Moreover, the joining between the aluminum refrigerant pipe and the stainless steel joint pipe is also the joining between dissimilar metals, so it is not easy. Specifically, the thermal conductivity of stainless steel is low, and it is difficult to uniformly heat the brazing portion with a welding torch. In addition, even if high-frequency brazing is to be performed, due to the complex shape of the refrigerant pipe, there is also the possibility that a circular high-frequency coil cannot be set on the brazing portion. Moreover, in the case of furnace brazing, the valve may be damaged by heat.

[0075] It should be noted that in the pressure reducing valve 50 of this embodiment, the length of the connection member 53 (the length of the joint pipe 52 in the tube axial direction) may be 5 mm or less. In this way, the brazing portion between the connection member 53 and the refrigerant pipe 36 can be shortened.

[0076] In the pressure reducing valve 50 of the present embodiment, the distance from the connecting member 53 to the valve body 51 may be 15 mm or more. In this way, the heat generated when the connecting member 53 is welded to the joint pipe 52 is unlikely to affect the valve body 51.

[0077] In the pressure reducing valve 50 of the present embodiment, the joint pipe 52 may be made of copper or a copper alloy and coated with a coating film. This can suppress the occurrence of electrolytic corrosion at the connection portion between the joint pipe 52 and the refrigerant pipe 36.

[0078] In the pressure reducing valve 50 of the present embodiment, the joint pipe 52 may be made of stainless steel. This can suppress the occurrence of electrolytic corrosion at the connection portion between the joint pipe 52 and the refrigerant pipe 36.

[0079] The heat exchanger 30 of this embodiment includes a pressure reducing valve 50, a heat transfer tube 35 and a refrigerant pipe 36. The heat transfer tube 35 is made of aluminum or an aluminum alloy. The refrigerant pipe 36 is connected to the heat transfer tube 35 and is made of aluminum or an aluminum alloy. The refrigerant pipe 36 is brazed on the connecting component 53 of the pressure reducing valve 50.

[0080] According to the heat exchanger 30 of this embodiment, in the pressure reducing valve 50, the aluminum connection member 53 is welded to the top end of the non-aluminum joint pipe 52. Therefore, the aluminum refrigerant pipe 36 can be brazed to the aluminum connection member 53. Therefore, since the brazing property is improved, the occurrence of poor joining can be suppressed. As a result, the reliability of the heat exchanger 30 is improved.

[0081] The air conditioning device ( 10 ) of the present embodiment includes a heat exchanger ( 30 ).

[0082] According to the air conditioner 10 of the present embodiment, in the pressure reducing valve 50 provided in the heat exchanger 30, the aluminum connection member 53 is welded to the top end of the non-aluminum joint pipe 52. Therefore, the aluminum refrigerant pipe 36 can be brazed to the aluminum connection member 53. Therefore, since the brazing property can be improved and the occurrence of poor joining can be suppressed, the reliability of the air conditioner 10 is improved.

[0083] In the method of manufacturing the heat exchanger 30 of the present embodiment, the refrigerant pipe 36 and the connecting member 53 of the pressure reducing valve 50 are connected by brazing.

[0084] According to the manufacturing method of the heat exchanger 30 of the present embodiment, in the pressure reducing valve 50, the aluminum connection member 53 is welded to the top end of the non-aluminum joint pipe 52. Therefore, the brazing property is improved by brazing the aluminum refrigerant pipe 36 to the aluminum connection member 53. Therefore, since the occurrence of poor joining can be suppressed, the reliability of the heat exchanger 30 is improved.

[0085] (Other embodiments)

[0086] In the above embodiment, the connection member 53 is formed into a bushing shape and inserted into the distal end portion of the joint pipe 52 , but the shape of the connection member 53 and the manner in which it is provided on the joint pipe 52 are not particularly limited.

[0087] In addition, in the above embodiment, a refrigerant pipe 36 is connected to a joint pipe 52, but it can also be replaced by, for example Figure 6 As shown, a plurality of refrigerant pipes 36 are connected to a joint pipe 52 via a branching portion 37. Figure 6 In, with Figure 3The same components of the illustrated embodiment are marked with the same reference numerals. The flow divider 37 is made of the same material as the refrigerant pipe 36, specifically, made of aluminum or an aluminum alloy. In this way, as in the above-mentioned embodiment, by brazing the aluminum flow divider 37 to the aluminum connecting member 53 of the pressure reducing valve 50, the brazing property can be improved and the occurrence of poor joining can be suppressed. The flow divider 37 and each refrigerant pipe 36 are joined together by brazing.

[0088] Furthermore, in the above-described embodiment, an example is given in which the heat exchanger 30 is applied to the air-conditioning device 10 as a refrigeration cycle device. However, the use of the heat exchanger 30 is of course not particularly limited.

[0089] In addition, in the above-mentioned embodiment, the case where the pressure reducing valve 50 is applied to the heat exchanger 30 is exemplified, but the use of the pressure reducing valve 50 is of course not particularly limited.

[0090] The above describes the implementation mode, but it should be understood that various changes in mode and details can be made without departing from the spirit and scope of the claims. The above implementation modes can also be appropriately combined or replaced. Moreover, the terms "first", "second", etc. mentioned above are only used to distinguish the sentences containing the above terms, and are not used to limit the number or order of the sentences.

[0091] - Industrial Applicability -

[0092] In summary, the present disclosure is useful for a pressure reducing valve, a heat exchanger, an air conditioning device, and a method for manufacturing a heat exchanger.

[0093] - Explanation of symbols -

[0094] 10 Air conditioning unit

[0095] 30 Heat exchanger

[0096] 35 Heat transfer tube

[0097] 36 Refrigerant pipes

[0098] 37 Diversion

[0099] 50 Pressure reducing valve

[0100] 51 Valve body

[0101] 52 Connector pipe

[0102] 53 Connecting parts

Claims

1. A pressure reducing valve (50), characterized in that: The pressure reducing valve (50) comprises a valve body (51), a joint pipe (52) and a connecting component (53). One end of the joint pipe (52) is connected to the valve body (51). The connecting component (53) is connected to the other end of the joint pipe (52) by welding and is used for brazing on a refrigerant pipe (36) made of aluminum or aluminum alloy. The joint pipe (52) is made of a metal other than aluminum. The connecting component (53) is made of aluminum or an aluminum alloy.

2. The pressure reducing valve (50) according to claim 1, characterized in that: The length of the connecting component (53) in the tube axial direction of the joint tube (52) is less than 5 mm.

3. The pressure reducing valve (50) according to claim 1 or 2, characterized in that: The distance from the connecting member (53) to the valve body (51) is greater than 15 mm.

4. The pressure reducing valve (50) according to claim 1 or 2, characterized in that: The joint pipe (52) is made of copper or copper alloy and is coated with a coating film.

5. The pressure reducing valve (50) according to claim 1 or 2, characterized in that: The joint pipe (52) is made of stainless steel.

6. A heat exchanger (30), characterized in that: The heat exchanger (30) comprises: The pressure reducing valve (50) according to any one of claims 1 to 5; a heat transfer tube (35), wherein the heat transfer tube (35) is made of aluminum or an aluminum alloy; and a refrigerant pipe (36), the refrigerant pipe (36) being connected to the heat transfer pipe (35) and being made of aluminum or an aluminum alloy, The refrigerant pipe (36) is brazed to the connecting component (53) of the pressure reducing valve (50).

7. The heat exchanger (30) according to claim 6, characterized in that: The refrigerant pipes (36) are provided with a plurality of pipes. The plurality of refrigerant pipes (36) are connected to the pressure reducing valve (50) via a flow dividing portion (37).

8. An air conditioning device, characterized in that: The air conditioning device comprises the heat exchanger (30) according to claim 6 or 7.

9. A method for manufacturing a heat exchanger (30), characterized in that: The heat exchanger (30) includes a pressure reducing valve (50), a heat transfer pipe (35) and a refrigerant pipe (36). The heat transfer tube (35) is made of aluminum or aluminum alloy. The refrigerant pipe (36) is connected to the heat transfer pipe (35) and is made of aluminum or aluminum alloy. The pressure reducing valve (50) comprises a valve body (51), a joint pipe (52) and a connecting component (53). One end of the joint pipe (52) is connected to the valve body (51). The connecting component (53) is connected to the other end of the joint pipe (52) by welding. The joint pipe (52) is made of a metal other than aluminum. The connecting member (53) is made of aluminum or aluminum alloy. The refrigerant pipe (36) and the connecting component (53) of the pressure reducing valve (50) are connected by brazing.

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