WO2021192189A1

WO2021192189A1 - Heat exchanger, refrigeration cycle device, and method for manufacturing heat exchanger

Info

Publication number: WO2021192189A1
Application number: PCT/JP2020/013884
Authority: WO
Inventors: 前田　剛志; 武巳松本; 圭佑西本; 友理子大熊; 石橋　晃; 暁八柳
Original assignee: 三菱電機株式会社
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2021-09-30
Also published as: JPWO2021192189A1; JP2023182618A; EP4130633A4; EP4130633A1

Abstract

This heat exchanger (1) is provided with a heat-transfer member (2) that comprises: a heat-transfer tube (20) which has a refrigerant flow passage (20a) formed therein; and a plate-like fin (21) which is integrally formed with the heat-transfer tube and which extends along the tube axis direction of the heat-transfer tube. The fin comprises: a joint part (22) that connects the fin to the heat-transfer tube; and a fin part (23) that constitutes the portion of the fin other than the joint part. The fin part is configured to have a plate thickness (t) that is thinner than the plate thickness (p) of the joint part.

Description

How to manufacture heat exchangers, refrigeration cycle devices and heat exchangers

The present disclosure relates to a method for manufacturing a heat exchanger, a refrigeration cycle device, and a heat exchanger having a heat transfer member having a heat transfer tube and fins extending in the axial direction of the heat transfer tube.

As a heat transfer member of this type of heat exchanger, a long plate-shaped fin has a recess extending in the longitudinal direction at the center in the lateral direction, and a heat transfer tube is brazed to the recess to form a structure. (See, for example, Patent Document 1).

JP-A-2018-155479

In Patent Document 1, since the fin and the heat transfer tube are formed as separate bodies, it is necessary to braze and join the fin and the heat transfer tube at the time of manufacturing, and the fin and the heat transfer tube are thermally deformed by the heat at the time of joining. When such thermal deformation occurs, there is a problem that the heat exchange performance of the heat exchanger is deteriorated as a result.

Further, in the heat exchanger, improvement of the thermal conductivity of the heat transfer member is required from the viewpoint of improving the heat exchange efficiency.

The present disclosure has been made in view of such a point, and it is possible to improve the heat exchange performance by making the connection between the fin and the heat transfer tube unnecessary, and to improve the thermal conductivity of the heat transfer member. The purpose is to obtain methods for manufacturing exchangers, refrigeration cycle devices and heat exchangers.

The heat exchanger according to the present disclosure includes a heat transfer member having a heat transfer tube having a refrigerant flow path inside and a plate-shaped fin integrally formed with the heat transfer tube and extending along the tube axis direction of the heat transfer tube. The fin has a joint portion that is a joint portion with the heat transfer tube and a fin portion that is a portion other than the joint portion, and the plate thickness of the fin portion is thinner than the plate thickness of the joint portion.

The refrigeration cycle device according to the present disclosure is provided with the above heat exchanger.

The method for manufacturing a heat exchanger according to the present disclosure is a heat exchanger including a heat transfer member having a heat transfer tube having a refrigerant flow path inside and a plate-shaped fin extending along the tube axis direction of the heat transfer tube. The method includes an extrusion step of forming a heat transfer tube and fins by extrusion molding, and a rolling step of rolling the fins.

According to the present disclosure, since the heat transfer tube and the fin are integrally molded, it is possible to avoid thermal deformation during manufacturing when the heat transfer tube and the fin are joined, and as a result, the heat exchange performance can be improved. .. Further, since the plate thickness of the fin portion, which is a portion of the fins other than the joint portion with the heat transfer tube, is formed to be thinner than the plate thickness of the joint portion, the thermal conductivity of the heat transfer member can be improved.

It is a perspective view which shows schematic structure of the heat exchanger which concerns on Embodiment 1. FIG. It is a side view of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. FIG. 2 is a cross-sectional view taken along the line AA of the heat transfer member of FIG. It is an enlarged cross-sectional view of a part of FIG. It is explanatory drawing of the manufacturing method of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is an end view cut by the AA cross section of step S6 of FIG. 5C. It is explanatory drawing of the modification of the manufacturing method of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is a figure which shows the pattern 1 of the modification 1 of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is a figure which shows the pattern 2 of the modification 1 of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is a figure which shows the pattern 3 of the modification 1 of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is a figure which shows the modification 2 of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is a figure which shows the modification 3 of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is a figure which shows the modification 4 of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is a figure which shows the modification 5 of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is a figure which shows the modification 6 of the heat transfer member of the heat exchanger which concerns on Embodiment 1. FIG. It is a figure which shows the refrigerant circuit of the refrigerating cycle apparatus which concerns on Embodiment 2.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following drawings including FIG. 1, the relative dimensional relationships and shapes of the constituent members may differ from the actual ones. Further, in the following drawings, those having the same reference numerals are the same or equivalent thereof, and this shall be common to the entire text of the specification. In addition, the shape, size, arrangement, etc. of the configurations shown in each figure can be appropriately changed within the scope of the present disclosure.

Embodiment 1.
FIG. 1 is a perspective view schematically showing the configuration of the heat exchanger according to the first embodiment. FIG. 2 is a side view of the heat transfer member of the heat exchanger according to the first embodiment. FIG. 3 is a cross-sectional view taken along the line AA of the heat transfer member of FIG. FIG. 4 is an enlarged cross-sectional view of a part of FIG. The heat exchanger 1 according to the first embodiment will be described with reference to FIGS. 1 to 4.

As shown in FIG. 1, the heat exchanger 1 has a plurality of heat transfer members 2, a first header 3, and a second header 4. The plurality of heat transfer members 2 are arranged at intervals in the X direction, so that air flows between the heat transfer members 2 in the Y direction orthogonal to the X direction. The plurality of heat transfer members 2 are formed in an elongated shape extending in the Z direction orthogonal to the X direction and the Y direction. Both ends of the heat transfer member 2 in the Z direction are connected to the first header 3 and the second header 4.

The heat transfer member 2 includes a heat transfer tube 20 through which a refrigerant flows, and fins 21. The heat transfer member 2 has an integral structure in which the heat transfer tube 20 and the fins 21 are integrally molded, and is made of a metal material having thermal conductivity. As the metal material, for example, aluminum, an aluminum alloy, copper, or a copper alloy is used.

As shown in FIG. 3, the heat transfer tube 20 is formed in a flat shape having a short axis and a long axis in cross section, and is composed of a flat tube having a plurality of refrigerant flow paths 20a formed by through holes. The long axis extends in the Y direction and the short axis extends in the X direction. The heat transfer tube 20 is not limited to a flat tube, but may be a circular tube. Although a configuration including a plurality of heat transfer members 2 is shown here, the number of heat transfer members 2 is arbitrary and may be 1 or more.

The fin 21 is composed of a long plate-shaped flat plate extending along the tube axis direction of the heat transfer tube 20. The longitudinal direction of the fin 21 corresponds to the Z direction, and the lateral direction of the fin 21 corresponds to the Y direction. At least two fins 21 are provided at positions facing each other with the heat transfer tube 20 interposed therebetween. Specifically, the fins 21 are provided at both ends of the heat transfer tube 20 in the Y direction and at the intermediate portion in the X direction. The fin 21 has a connecting portion 22 which is a connecting portion with the heat transfer tube 20, and a fin portion 23 which is thinner than the connecting portion 22. In this way, by forming the plate thickness t of the fin portion 23 thinner than the plate thickness p of the coupling portion 22, the heat of the fin 21 is compared with the configuration in which the entire fin 21 is formed to have the same plate thickness as the coupling portion 22. It is possible to improve the conductivity.

As shown in FIG. 2, both ends of the fin 21 in the Z direction are located inside the both ends of the heat transfer tube 20 in the Z direction, and both ends of the heat transfer tube 20 protrude from the fin 21. It has become. The portion of the heat transfer tube 20 that protrudes from the fin 21 is an insertion portion 20b that is inserted into the first header 3 and the second header 4.

As shown in FIG. 3, the fin portion 23 is configured such that t / w is 0.1 or less when the plate thickness dimension of the fin portion 23 is t and the width dimension of the fin portion 23 is w. As a result, the weight of the fin 21 can be reduced as compared with the case where the plate thickness of the fin portion 23 is the same as the plate thickness of the coupling portion 22. Further, by reducing the plate thickness of the fin portion 23, the thermal resistance inside the fin material is reduced, so that the heat exchange efficiency between the refrigerant side and the air side is improved.

The first header 3 and the second header 4 are hollow containers extending in the X direction. In FIG. 1, the first header 3 and the second header 4 are formed in a rectangular parallelepiped shape, but the shape is not limited and may be a circular shape or the like. A plurality of insertion holes (not shown) are formed in the first header 3 and the second header 4. One insertion portion 20b of the plurality of heat transfer tubes 20 is inserted into the plurality of insertion holes of the first header 3, and the ends of the plurality of heat transfer tubes 20 communicate with each other inside the first header 3. The other insertion portion 20b of the plurality of heat transfer tubes 20 is inserted into the plurality of insertion holes of the second header 4, and the other end portions of the plurality of heat transfer tubes 20 communicate with each other inside the first header 3. Further, a refrigerant inlet / outlet pipe 5 is connected to the first header 3, and a refrigerant inlet / outlet pipe 6 is connected to the second header 4.

In the heat exchanger 1 configured in this way, the refrigerant flows into the first header 3 from the refrigerant inlet / outlet pipe 5. The refrigerant that has flowed into the first header 3 is distributed from the first header 3 to the heat transfer tubes 20 of each heat transfer member 2, and flows through the heat transfer tubes 20 toward the second header 4. The refrigerant flowing through the heat transfer pipe 20 exchanges heat with the air flowing in the Y direction, then merges in the second header 4, and flows out from the refrigerant inlet / outlet pipe 6. Here, it is assumed that the refrigerant flows in from the refrigerant inlet / outlet pipe 5 connected to the first header 3 and flows out from the refrigerant inlet / outlet pipe 6 connected to the second header 4, but the reverse flow may be used. That is, the refrigerant may flow in from the refrigerant inlet / outlet pipe 6 connected to the second header 4 and flow out from the refrigerant inlet / outlet pipe 5 connected to the first header 3.

Here, in heat exchange between the refrigerant flowing through the heat transfer tube 20 and air, the heat of the refrigerant flowing through the heat transfer tube 20 is transferred to the fins 21, and heat exchange is performed between the entire heat transfer member 2 and the air. As described above, the fin portion 23 of the fin 21 is configured to be thinner than the joint portion 22. Therefore, the thermal conductivity of the fins 21 is improved as compared with the configuration in which the entire fins 21 are formed to have the same thickness as the coupling portion 22. Therefore, the heat of the refrigerant transmitted from the heat transfer tube 20 to the fins 21 is efficiently transferred to the entire fins 21, and the heat exchange efficiency between the heat transfer member 2 and the air is enhanced.

Next, the manufacturing method of the heat transfer member 2 will be described.

FIG. 5 is an explanatory diagram of a method of manufacturing a heat transfer member of the heat exchanger according to the first embodiment. FIG. 5A is a flowchart of the manufacturing method. FIG. 5B is a cross-sectional view of the heat transfer member in each step cut along the XY plane. FIG. 5C is a side view of the heat transfer member in each step as viewed from the X direction. The method for manufacturing the heat transfer member includes the steps S1 to S6 as shown in FIG. 5 (a), FIG. 5 (b) shows a cross-sectional view corresponding to each step, and FIG. 5 (c) shows. Shows a side view corresponding to each step. In FIG. 5C, the fin portion is indicated by a dot. FIG. 6 is an end view cut along the AA cross section of step S6 of FIG. 5 (c).

In the production of the heat transfer member 2, first, the heated metal material is extruded from the holes of the die, and the heat transfer member base material 100 having the cross-sectional shape of step S1 in FIG. 5B is formed (extrusion step). (Step S1)). The heat transfer member base material 100 has a heat transfer tube 20 and two fins 21 formed at both ends of the heat transfer tube 20 in the Y direction. Next, the heat transfer tube 20 is straightened according to the dimensions of the insertion holes provided in the first header 3 and the second header 4 (resizing step (step S2)). This resizing step is performed by applying pressure to the fins 21 from both ends of the heat transfer member base material 100 in the Y direction. By performing the resizing step before the next rolling step, that is, before thinning the plate thickness of the fin 21, the force can be applied to the heat transfer tube 20 without bending the fin 21.

Subsequently, the two fins 21 are rolled (rolling step (step S3)). In the rolling step, the fins 21 are rolled so as to have a set plate thickness. By this rolling step, the fin portion 23, which is a portion of the fin 21 excluding the joint portion 22 with the heat transfer tube 20, is formed to have a set plate thickness. Here, if the joint portion 22 is also rolled to the set plate thickness, the heat transfer tube 20 may be deformed. Therefore, the fin portion 23 of the fins 21 excluding the connecting portion 22 is rolled. The rolling step is performed in a state where the recrystallization temperature of the material constituting the heat transfer member 2 is exceeded. This is because when the rolling process is performed at a temperature equal to or lower than the recrystallization temperature of the material constituting the heat transfer member 2, the material becomes hard and it becomes difficult to form the set plate thickness, and the processing accuracy drops. ..

Then, the heat transfer member base material 100 that has undergone the above steps is cooled (cooling step (step S4)), and then the ends of each fin 21 in the Y direction are cut (cutting step (step S5)). Since the end of the fin 21 after the rolling step is twisted in FIG. 5B, in the cutting step, the twisted portion is cut to adjust the shape of the fin 21. Then, both ends of each fin 21 in the Z direction are cut (terminal processing step (step S6)). In the terminal processing step, both ends of the heat transfer tube 20 in the Y direction are cut together with the fins 21 as shown in FIG. By this terminal processing step, the heat transfer tube 20 is in a state of protruding from both ends of the fin 21 in the Z direction as shown in step S6 of FIG. 5C, and is inserted into the first header 3 and the second header 4. Insertion portion 20b is formed. As described above, the heat transfer member 2 is manufactured.

<Modification example of manufacturing method>
The manufacturing method of the heat transfer member 2 is not limited to the manufacturing method shown in FIG. 5, and may be modified as follows, for example, as long as it does not deviate from the gist of the first embodiment.

(Modification example)
FIG. 7 is an explanatory view of a modified example of a method of manufacturing a heat transfer member of the heat exchanger according to the first embodiment. Hereinafter, the difference between the manufacturing method of FIG. 7 and the manufacturing method shown in FIG. 5 will be described.
In the manufacturing method shown in FIG. 5, two fins 21 were rolled at the same time in the rolling step. On the other hand, in this modification, the two fins 21 are rolled at different timings. That is, as shown in FIG. 7, one of the two fins 21 is rolled (first rolling step (step S3a)), and then the other of the two fins 21 is rolled (second rolling step (step S3a)). Step S3b)). If two fins 21 located at positions facing each other across the heat transfer tube 20 are rolled at the same time, the heat transfer tube 20 may be pulled and deformed. Therefore, in the modified example, the two fins 21 are performed at different timings. Thereby, the deformation of the heat transfer tube 20 can be suppressed.

<Modification example of heat transfer member 2>
The heat transfer member 2 is not limited to the configuration of the basic form shown in FIGS. 1 to 4, and may be deformed as follows, for example, within a range that does not deviate from the gist of the first embodiment. good.

(Modification example 1)
FIG. 8 is a diagram showing pattern 1 of a modification 1 of the heat transfer member of the heat exchanger according to the first embodiment. FIG. 9 is a diagram showing pattern 2 of a modification 1 of the heat transfer member of the heat exchanger according to the first embodiment. FIG. 10 is a diagram showing a pattern 3 of a modification 1 of the heat transfer member of the heat exchanger according to the first embodiment. 8 to 10, (a) is a cross-sectional view of the heat transfer member, and (b) is a side view of the heat transfer member.
In the first modification, the fin portion 23 has a wavy shape. As shown in FIG. 8, the wave shape of the fin portion 23 may be a wave shape in which a wave displaced in the X direction continues in the Y direction, or a wave in which a wave displaced in the X direction continues in the Z direction as shown in FIG. It may have a shape, or as shown in FIG. 10, a wave shape in which a wave displaced in the X direction continues in the Y direction and the Z direction may be used. By forming the fin portion 23 into a wavy shape in this way, the surface area of the fin portion 23 can be increased, and the heat transfer coefficient to the air can be improved. Such a wavy shape of the fin portion 23 may be formed at the same time as the rolling step, or may be formed after the rolling step.

(Modification 2)
FIG. 11 is a diagram showing a modified example 2 of the heat transfer member of the heat exchanger according to the first embodiment.
The second modification has a concave-convex shape 24 on the surface of the fin portion 23. By having the uneven shape 24 on the surface of the fin portion 23 in this way, the air flow on the surface of the fin portion 23 is turbulent, and the heat transfer coefficient to the air can be improved. Such an uneven shape 24 may be formed at the same time as the rolling step, or may be formed after the rolling step.

(Modification example 3)
FIG. 12 is a diagram showing a modified example 3 of the heat transfer member of the heat exchanger according to the first embodiment.
In the above basic embodiment, the position of the coupling portion 22 of the fin 21 with the heat transfer tube 20 in the X direction is the central portion of the heat transfer tube 20, but in the modified example 3, the end portion of the heat transfer tube 20 in the X direction is used. Is. With this configuration, the rolling roller for rolling the fins 21 can be simplified.

(Modification example 4)
FIG. 13 is a diagram showing a modified example 4 of the heat transfer member of the heat exchanger according to the first embodiment.
In the modified example 4, the fin 21 is used only on one side of the heat transfer tube 20.

(Modification 5)
FIG. 14 is a diagram showing a modified example 5 of the heat transfer member of the heat exchanger according to the first embodiment.
In the modified example 5, the heat transfer member 2 is configured to include a plurality of heat transfer tubes 20. The heat transfer tubes 20 are connected to each other by fins 21. Note that the coupling portion 22 is not shown in FIG.

(Modification 6)
FIG. 15 is a diagram showing a modified example 6 of the heat transfer member of the heat exchanger according to the first embodiment.
In the modified example 6, the heat transfer tube 20 is composed of a circular tube. Here, an example in which the heat transfer tube 20 of the heat transfer member 2 of the modified example of FIG. 14 is a circular tube is shown, but in both the above basic form and the above modified examples 1 to 5, the heat transfer tube 20 is used as a circular tube. May be good. Note that the coupling portion 22 is not shown in FIG.

(Modification 7)
The configuration may be a combination of the above modification examples as appropriate. For example, the modified example 1 and the modified example 2 may be combined to provide the concave-convex shape 24 on the surface of the fin portion 23 having a wavy shape.

As described above, the heat exchanger 1 of the first embodiment is a long plate that is integrally formed with the heat transfer tube 20 through which the refrigerant flows and extends along the tube axis direction of the heat transfer tube 20. A heat transfer member 2 having the shape fin 21 and the shape fin 21 is provided. The fin 21 of the heat transfer member 2 is formed so that the thickness of the fin portion 23 other than the joint portion 22 with the heat transfer tube 20 is thinner than the plate thickness of the joint portion 22. In this way, the heat transfer tube 20 and the fin 21 are integrated to form a structure that does not require joining the fin 21 and the heat transfer tube 20, so that deformation due to heat at the time of joining is avoided and the heat exchange performance is improved. be able to. Further, by forming the plate thickness of the fin portion 23 thinner than the plate thickness of the coupling portion 22, the thermal conductivity of the fin 21 is improved as compared with the configuration in which the entire fin 21 is formed to have the same plate thickness as the coupling portion 22. can.

The fin portion 23 may be formed in a wavy shape, or may have a concave-convex shape 24 formed on the surface of the fin portion 23. By forming the fin portion 23 in this way, the heat transfer coefficient to the air can be improved.

The fin 21 has t / w of 0.1 or less, where t is the thickness dimension of the fin portion 23 and w is the width dimension of the fin portion 23 in the lateral direction. As a result, the weight of the heat transfer member 2 can be reduced as compared with the case where the plate thickness of the fin portion 23 is the same as the plate thickness of the coupling portion 22.

The heat transfer member 2 may have a plurality of heat transfer tubes 20, and the heat transfer tubes 20 may be connected to each other by fins 21. Further, the heat transfer tube 20 may be formed of a flat tube or a circular tube.

The method for manufacturing the heat exchanger 1 of the first embodiment includes an extrusion step of forming the heat transfer tube 20 and the fins 21 by extrusion molding, and a rolling step of rolling the fins 21. By integrally molding the heat transfer tube 20 and the fin 21 in this way, the joining step can be eliminated, and as a result, the heat exchange performance can be improved. Then, by rolling the fins 21, the plate thickness of the fins 21 can be reduced and the thermal conductivity of the heat transfer member 2 can be improved.

In the rolling process, the fin 21 is rolled except for the joint portion 22 with the heat transfer tube 20. As a result, deformation of the heat transfer tube 20 during rolling can be suppressed.

The rolling process is performed in a state where the recrystallization temperature of the material constituting the heat transfer member 2 is exceeded. As a result, the fins 21 can be rolled with high processing accuracy.

Between the extrusion process and the rolling process, there is a resizing process for correcting the dimensions of the heat transfer tube 20 while applying pressure to the fins 21. By performing the resizing step before rolling the fins 21 in this way, it is possible to apply force to the heat transfer tube 20 without bending the fins 21.

Two fins 21 are provided at positions facing each other with the heat transfer tube 20 interposed therebetween, and in the rolling step, the step of rolling one fin 21 and the step of rolling the other fin 21 are performed at different timings. Thereby, the deformation of the heat transfer tube 20 can be suppressed.

The first embodiment has a cutting step of cutting the end portion of the fin 21 rolled in the rolling step in the lateral direction. As a result, the twisted portion of the fin 21 after the fin is rolled can be cut and the shape can be adjusted.

Embodiment 2.
The second embodiment relates to a refrigeration cycle apparatus including the heat exchanger 1 of the first embodiment.

FIG. 16 is a diagram showing a refrigerant circuit of the refrigeration cycle device according to the second embodiment.
The refrigeration cycle device 200 includes a compressor 201, a condenser 202, a pressure reducing device 203 composed of an expansion valve and the like, and an evaporator 204. The heat exchanger 1 of the first embodiment is used for one or both of the condenser 202 and the evaporator 204.

The refrigeration cycle device 200 configured in this way operates as follows.
The refrigerant compressed by the compressor 201 flows into the condenser 202. The refrigerant that has flowed into the condenser 202 exchanges heat with the air that passes through the condenser 202, is cooled, and flows into the decompression device 203. The refrigerant that has flowed into the depressurizing device 203 is decompressed and flows into the evaporator 204. The refrigerant flowing into the evaporator 204 heats by exchanging heat with the air passing through the evaporator 204, and is sucked into the compressor 201 again.

Since the refrigeration cycle device 200 of the second embodiment includes the heat exchanger 1 of the first embodiment, the refrigeration cycle device 200 having good heat exchange performance can be configured.

The refrigeration cycle device 200 can be applied to an air conditioner, a refrigerator, a refrigerator, or the like.

1 heat exchanger, 2 heat transfer member, 3 1st header, 4th 2nd header, 5 refrigerant inlet / outlet pipe, 6 refrigerant inlet / outlet pipe, 20 heat transfer pipe, 20a refrigerant flow path, 20b insertion part, 21 fin, 22 coupling part, 23 fins, 24 uneven shape, 100 heat transfer member base material, 200 refrigeration cycle device, 201 compressor, 202 condenser, 203 decompression device, 204 evaporator.

Claims

A heat transfer member having a heat transfer tube having a refrigerant flow path inside and a plate-shaped fin integrally formed with the heat transfer tube and extending along the tube axis direction of the heat transfer tube is provided.
The fin has a coupling portion that is a coupling portion with the heat transfer tube and a fin portion that is a portion other than the coupling portion.
A heat exchanger in which the plate thickness of the fin portion is thinner than the plate thickness of the joint portion.
The heat exchanger according to claim 1, wherein the fin has a wavy shape.
The heat exchanger according to claim 1 or 2, wherein an uneven shape is formed on the surface of the fin.
The heat exchanger according to any one of claims 1 to 3, wherein the heat transfer member has a plurality of the heat transfer tubes, and the heat transfer tubes are connected to each other by the fins.
The heat exchanger according to any one of claims 1 to 4, wherein the heat transfer tube is a flat tube.
The heat exchanger according to any one of claims 1 to 4, wherein the heat transfer tube is a circular tube.
A refrigeration cycle apparatus provided with the heat exchanger according to any one of claims 1 to 6.
A method for manufacturing a heat exchanger including a heat transfer member having a heat transfer tube having a refrigerant flow path inside and a plate-shaped fin extending along the tube axis direction of the heat transfer tube.
An extrusion step of forming the heat transfer tube and the fins by extrusion molding,
After the extrusion step, a rolling step of rolling the fins and
A method of manufacturing a heat exchanger having.
The method for manufacturing a heat exchanger according to claim 8, wherein in the rolling step, the fins are rolled excluding the joint portion with the heat transfer tube.
The method for manufacturing a heat exchanger according to claim 8 or 9, wherein the rolling step is performed in a state where the recrystallization temperature of the material constituting the heat transfer member is exceeded.
The heat exchanger according to any one of claims 8 to 10, further comprising a resizing step of correcting the dimensions of the heat transfer tube while applying pressure to the fins between the extrusion step and the rolling step. Production method.
Two fins are provided at positions facing each other with the heat transfer tube interposed therebetween, and in the rolling step, a step of rolling one of the fins and a step of rolling the other fin are performed at different timings. Item 8. The method for manufacturing a heat exchanger according to any one of claims 8 to 11.
The method for manufacturing a heat exchanger according to any one of claims 8 to 12, further comprising a cutting step of cutting the end portion of the fin rolled in the rolling step in the lateral direction.