WO2018168759A1

WO2018168759A1 - Heat exchanger having heat transfer tube unit

Info

Publication number: WO2018168759A1
Application number: PCT/JP2018/009485
Authority: WO
Inventors: 秀之日下; 中野　寛之; 透安東; 俊吉岡
Original assignee: ダイキン工業株式会社
Priority date: 2017-03-16
Filing date: 2018-03-12
Publication date: 2018-09-20

Abstract

A heat exchanger (10) equipped with a heat transfer tube unit (30) and headers (21, 22). The heat transfer tube unit (30) has at least one fin (32) and multiple heat transfer tubes (31). The heat transfer tube unit (30) is connected to the headers (21, 22). The fin (32) and the heat transfer tubes (31) are alternately arranged. The multiple heat transfer tubes (31) extend in the lengthwise direction (z) of the heat transfer tubes. The fin (32) is joined to the heat transfer tubes (31) at the side extending in the lengthwise direction (z) of the heat transfer tubes. In the lengthwise direction (z) of the heat transfer tubes, the end (32e) of the fin (32) is positioned closer to the center of the heat transfer tube unit (30) than the ends (31e) of the heat transfer tubes (31). Holes (24) for inserting the ends of the heat transfer tubes (31) are provided in the headers (21, 22).

Description

Heat exchanger with heat transfer tube unit

The present invention relates to a heat exchanger having a heat transfer tube unit.

Some heat exchangers used in air conditioners and the like have a heat transfer tube unit in which a heat transfer tube for flowing a refrigerant and a fin for performing heat exchange are formed as an integral member. The heat exchanger disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2013-139965) has a plurality of such heat transfer tube units. The plurality of heat transfer tube units are connected to a common header. In order to facilitate this connection, the header is divided into a number of layers. In manufacturing this heat exchanger, header division layers and heat transfer tube units are alternately stacked. Next, in order to prevent the refrigerant from leaking from the joint of the header dividing layer, the stack of the header dividing layer and the heat transfer tube unit is brazed in a furnace.

Since the heat exchanger having such a structure is composed of a number of header division layers, the number of parts is large and the manufacturing process is complicated.

An object of the present invention is to provide a heat exchanger that is easy to manufacture.

The heat exchanger according to the first aspect of the present invention includes a heat transfer tube unit and a header. The heat transfer tube unit has at least one fin and a plurality of heat transfer tubes. A heat transfer tube unit is connected to the header. The fins and the heat transfer tubes are alternately arranged. The plurality of heat transfer tubes extend in the heat transfer tube extension direction. The fin is joined to the heat transfer tube at a side extending in the heat transfer tube extension direction. In the heat transfer tube extension direction, the end of the fin is located closer to the center of the heat transfer tube unit than the end of the heat transfer tube. The header is provided with a hole for inserting the end of the heat transfer tube.

¡According to this configuration, the end of the heat transfer tube protrudes from the end of the fin. Therefore, a heat exchanger can be easily manufactured by inserting the protrusion part of a heat exchanger tube into the hole of a header.

The heat exchanger according to a second aspect of the present invention is the heat exchanger according to claim 1, wherein the header includes a first header and a second header sandwiching the heat transfer tube unit in the heat exchanger according to the first aspect. .

According to this configuration, both ends of the heat transfer tube unit are respectively fixed to the header. Therefore, the durability of the heat exchanger against external force and impact is improved.

The heat exchanger according to the third aspect of the present invention is the heat exchanger according to the second aspect, wherein the second header is provided below the first header. The heat transfer tube unit connection surface of the second header is inclined with respect to the heat transfer tube separation direction.

According to this configuration, the heat transfer tube unit connection surface of the second header is inclined. Therefore, the dew condensation water that reaches the heat transfer tube unit connection surface through the heat transfer tube unit flows down from the second header due to the inclination, so that the drainage of the heat exchanger is improved.

In the heat exchanger according to the fourth aspect of the present invention, in the heat exchanger according to any one of the first aspect to the third aspect, the header is a circular pipe.

According to this configuration, the header is a circular pipe. Therefore, since the header is easy to manufacture, the heat exchanger can be manufactured more easily.

A heat exchanger according to a fifth aspect of the present invention is the heat exchanger according to any one of the first to fourth aspects, wherein the end of the fin is inserted into the hole and the end of the heat transfer tube is inserted into the hole. It has a shape that matches the shape of the header so as to contact the header in a state.

According to this configuration, the end of the fin contacts the header. Therefore, the connection strength between the heat transfer tube unit and the header is improved.

The heat exchanger according to a sixth aspect of the present invention is the heat exchanger according to any one of the first to fourth aspects, wherein the fin ends are separated from the header.

According to this configuration, the phenomenon that the brazing material moves between the fins by capillary action can be suppressed.

The heat exchanger according to the seventh aspect of the present invention is the heat exchanger according to the fifth aspect, wherein the heat transfer tube unit has a stopper. A stopper is provided in the location between the edge part of a heat exchanger tube, and the edge part of a fin in a heat exchanger tube. The stopper has a shape that cannot pass through the hole in the header.

According to this configuration, the phenomenon in which the brazing material moves between the fins by capillary action can be further suppressed.

The heat exchanger according to the eighth aspect of the present invention is the heat exchanger according to any one of the first to seventh aspects, wherein the heat transfer tube unit is a single member.

According to this configuration, the heat transfer tube unit is a single member. Therefore, since the heat transfer tube unit is easy to handle, the assembly of the heat exchanger is easy.

The heat exchanger manufacturing method according to the ninth aspect of the present invention includes a step of forming a heat transfer tube unit having fins and heat transfer tubes, and a heat transfer tube extending direction in which the end portions of the fins are transferred rather than the end portions of the heat transfer tubes. In order to be positioned close to the center of the heat tube unit, a step of cutting off a part of the fin to provide a notch, a step of providing a hole for inserting the end of the heat transfer tube in the header, and an end of the heat transfer tube in the hole And a step of brazing the heat transfer tube unit and the header.

According to this method, the end of the heat transfer tube protrudes from the end of the fin by cutting away a part of the fin and providing a notch. Therefore, a heat exchanger can be easily manufactured by inserting the protrusion part of a heat exchanger tube into the hole of a header.

The method for manufacturing a heat exchanger according to a tenth aspect of the present invention is the method according to the ninth aspect, wherein the step of forming the heat transfer tube unit is a step of integrally forming the fin and the heat transfer tube by extrusion molding of a metal material. including.

According to this method, the heat transfer tube unit is formed as a single member by extrusion molding of a metal material. Therefore, since the heat transfer tube unit is easy to handle, the assembly of the heat exchanger is easy.

In the method for manufacturing a heat exchanger according to the eleventh aspect of the present invention, in the method according to the ninth aspect or the tenth aspect, in the step of providing the notch, a plurality of portions of the fin are cut out by punching.

According to this method, a plurality of locations are excised by punching. Therefore, the production of the heat exchanger is made efficient.

In the heat exchanger manufacturing method according to the twelfth aspect of the present invention, in the method according to any one of the ninth aspect to the eleventh aspect, the hole is formed by a drill in the step of providing the hole.

According to this method, the hole in the header is easily formed using a drill. Therefore, manufacture of a heat exchanger becomes still easier.

According to the heat exchanger according to the first aspect, the fourth aspect, and the eighth aspect of the present invention, the heat exchanger can be easily manufactured.

The heat exchanger according to the second aspect of the present invention improves the durability of the heat exchanger against external forces and impacts.

According to the heat exchanger according to the third aspect of the present invention, the drainage of the heat exchanger is improved.

According to the heat exchanger according to the fifth aspect of the present invention, the connection strength between the heat transfer tube unit and the header is improved.

The heat exchanger according to the sixth aspect and the seventh aspect of the present invention can suppress the phenomenon that the brazing material moves between the fins due to the capillary phenomenon.

According to the method for manufacturing a heat exchanger according to the ninth to twelfth aspects of the present invention, the heat exchanger can be easily manufactured.

It is a schematic diagram which shows the external shape of the heat exchanger 10 which concerns on 1st Embodiment of this invention. FIG. 3 is a schematic diagram showing an outer shape of a heat transfer tube unit 30. 3 is a cross-sectional view of a heat transfer tube unit 30. FIG. 2 is a partial cross-sectional view of the heat exchanger 10. FIG. It is a fragmentary sectional view of heat exchanger 10 'concerning the 1st modification of a 1st embodiment of the present invention. It is a fragmentary sectional view of heat exchanger 10 '' concerning the 2nd modification of a 1st embodiment of the present invention. It is a fragmentary sectional view of heat exchanger 10A concerning a 2nd embodiment of the present invention. It is a fragmentary sectional view of heat exchanger 10B concerning a 3rd embodiment of the present invention. It is a fragmentary sectional view of heat exchanger 10C concerning a 4th embodiment of the present invention. It is a schematic diagram which shows the external shape of heat exchanger 10D which concerns on 5th Embodiment of this invention. FIG. 3 is a schematic diagram showing an outer shape of a heat transfer tube unit 30.

<First Embodiment>
(1) Overall Configuration FIG. 1 shows a heat exchanger 10 according to the first embodiment of the present invention. The heat exchanger 10 is used, for example, in an air conditioner in order to exchange heat between the refrigerant and air. The heat exchanger 10 includes a first pipe 41, a second pipe 42, a first header 21, a second header 22, and a heat transfer tube unit group 39. The heat transfer tube unit group 39 includes a plurality of heat transfer tube units 30.

(2) Configuration of Each Part (2-1) Header and Piping The first piping 41 and the second piping 42 are for passing a refrigerant. Both the first pipe 41 and the second pipe 42 can function as refrigerant inlets and outlets that can take various states such as gas, liquid, and gas-liquid two-phase. The first pipe 41 is connected to the first header 21 so as to exchange refrigerant with the first header 21. The second pipe 42 is connected to the second header 22 so as to exchange refrigerant with the second header 22. The first header 21 and the second header 22 are both hollow members and have a heat transfer tube unit connection surface 23. The first header 21 and the second header 22 are arranged such that the heat transfer tube unit connection surfaces 23 face each other or substantially face each other. In the present embodiment, the second header 22 is provided below the first header 21.

(2-2) Heat Transfer Tube Unit The plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 39 are arranged at intervals in the heat transfer tube unit arrangement direction x. Each heat transfer tube unit 30 is connected to the first header 21 and the second header at each heat transfer tube unit connection surface 23.

FIG. 2 shows one heat transfer tube unit 30. The heat transfer tube unit 30 includes a plurality of heat transfer tubes 31 and a plurality of fins 32. The number of heat transfer tubes 31 provided in the heat transfer tube unit 30 is, for example, six or more, but is not limited thereto.

The heat transfer tube 31 is for moving the refrigerant between the first header 21 and the second header 22. Both ends of each heat transfer tube 31 are connected to the heat transfer tube unit connection surfaces 23 of the first header 21 and the second header 22. Each heat transfer tube 31 has at least a portion extending in the heat transfer tube extension direction z, and is preferably linear. The plurality of heat transfer tubes 31 are arranged in the heat transfer tube separation direction y.

The fins 32 are for exchanging heat between the refrigerant flowing through the adjacent heat transfer tubes 31 and the surrounding air. Each fin 32 is disposed between two adjacent heat transfer tubes 31. The fins 32 may be further disposed outside the outermost heat transfer tube 31 of the heat transfer tube unit 30. The fin 32 has a side extending in the heat transfer tube extension direction z, and is joined to the heat transfer tube 31 at that side. The fins 32 and the heat transfer tubes 31 are alternately arranged in the heat transfer tube separation direction y. The air is configured to flow in a direction parallel to the yz plane by a fan or the like (not shown). The direction of the air flow may coincide with the heat transfer tube separation direction y.

The heat transfer tube unit arrangement direction x, the heat transfer tube separation direction y, and the heat transfer tube extension direction z intersect each other. The heat transfer tube unit arrangement direction x, the heat transfer tube separation direction y, and the heat transfer tube extension direction z may be perpendicular to each other. The heat transfer tube unit arrangement direction x and the heat transfer tube separation direction y may be a horizontal direction, and the heat transfer tube extension direction z may be a vertical direction.

FIG. 3 shows a cross section of the heat transfer tube unit 30. The inner diameter D of each heat transfer tube 31 is, for example, 1.5 mm or less, and preferably 0.8 mm or less. The thickness T of the fin 32 is, for example, 0.3 mm or less, preferably 0.2 mm or less, more preferably 0.1 mm or less.

(3) Connection Structure of Heat Transfer Tube Unit and Header As shown in FIG. 2, a notch 33 is formed at the fin 32 at the end of the heat transfer tube unit 30. Due to the presence of the notch 33, the end 32 e of the fin 32 is positioned closer to the center of the heat transfer tube unit 30 than the end 31 e of the heat transfer tube 31 in the heat transfer tube extension direction z.

FIG. 4 is a cross-sectional view of the heat exchanger 10. The second header 22 is provided with a hole 24 for inserting the end 31 e of the heat transfer tube 31. The end 32e of the fin 32 has the shape of the second header 22 so that at least the heat transfer tube unit connection surface 23 of the second header 22 is in contact with the end 31e of the heat transfer tube 31 inserted in the hole 24. It has a matching shape. This contact location is fixed by brazing or the like, thereby sealing the refrigerant path.

4 shows the periphery of the second header 22, the periphery of the first header 21 has the same structure.

(4) Manufacturing method of the heat exchanger 10 The heat exchanger tube unit 30 is manufactured from metal materials, such as aluminum or aluminum alloy, for example. First, a metal material is extruded using a mold corresponding to the cross-sectional shape of FIG. 3, and the fins 32 and the heat transfer tubes 31 are integrally formed. Next, a part of the fin 32 is cut away to provide a notch 33. Accordingly, the end portions 32e of the fins 32 are located closer to the center of the heat transfer tube unit 30 than the end portions 31e of the heat transfer tubes 31 in the heat transfer tube extension direction z. The notch 33 is desirably formed by cutting a plurality of locations of the fin 32 by punching.

The first header 21 and the second header 22 are manufactured by processing a metal material into a tubular shape. The first header 21 and the second header 22 are provided with holes 24 for inserting the end portions 31 e of the heat transfer tubes 31. The hole 24 is a circular hole formed by a drill, for example.

In the assembly of the heat exchanger 10, the end portion 31 e of the heat transfer tube 31 of the heat transfer tube unit 30 is inserted into the holes 24 of the first header 21 and the second header 22. As a result, the end 32e of the fin 32 comes into contact with the heat transfer tube unit connection surface 23 of the second header 22. At this contact location, the heat transfer tube unit 30 and the first header 21 or the second header 22 are brazed. Specifically, the brazing material is applied to the heat transfer tube unit connection surfaces 23 of the first header 21 and the second header 22 in advance. After the end 31e of the heat transfer tube 31 of the heat transfer tube unit 30 is inserted into the hole 24 of the heat transfer tube unit connection surface 23, the heat exchanger 10 is put into the furnace. Thereafter, the brazing material is melted and fills the gap between the edge of the hole 24 and the heat transfer tube 31.

(5) Features (5-1)
By removing a part of the fin 32 and providing the notch 33, the end 31 e of the heat transfer tube 31 protrudes from the end 32 e of the fin 32. Therefore, the heat exchanger 10 can be easily manufactured by inserting the protruding portions of the heat transfer tubes 31 into the holes 24 of the first header 21 and the second header 22.

(5-2)
Both ends of the heat transfer tube unit 30 are fixed to the first header 21 and the second header 22, respectively. Therefore, the durability of the heat exchanger against external force and impact is improved.

(5-3)
End portions 32 e of the fins 32 are in contact with the first header 21 and the second header 22. Therefore, the connection strength between the heat transfer tube unit 30 and the first header 21 and the second header 22 is improved.

(5-4)
The heat transfer tube unit 30 is formed as a single member by extrusion molding of a metal material. Therefore, since the heat transfer tube unit 30 is easy to handle, the assembly of the heat exchanger 10 is easy.

(5-5)
A plurality of notches 33 are formed at a time by punching. Therefore, the production of the heat exchanger 10 is made efficient.

(5-6)
The holes of the first header 21 and the second header 22 may be easily formed using a drill. In this case, the manufacture of the heat exchanger 10 is further facilitated.

(6) Modified Examples Hereinafter, modified examples of the present embodiment will be described.

(6-1) First Modification FIG. 5 shows a heat exchanger 10 ′ according to a first modification of the first embodiment of the present invention. The heat exchanger 10 ′ is different from the heat exchanger 10 according to the first embodiment in that the end portions 32e of the fins 32 are separated from the heat transfer tube unit connection surfaces 23 of the first header 21 and the second header 22. Is different. This structure is realized by a stopper 35 provided on the heat transfer tube 31. The stopper 35 is provided at a location between the end 31 e of the heat transfer tube 31 and the end 32 e of the fin 32. The stopper 35 has a shape that cannot pass through the holes 24 of the first header 21 and the second header 22. A gap 36 is provided between the stopper 35 and the fin 32, whereby the stopper 35 is separated from the end portion 32 e of the fin 32. In this modification, stoppers 35 are provided on all the heat transfer tubes 31 of the heat transfer tube unit 30.

In manufacturing, the stopper 35 is first formed as a fin 32. Thereafter, in the step of punching out the fins 32 to form the notches 33, the stoppers 35 are left on the heat transfer tubes 31 without being removed.

According to this configuration, the stopper 35 is separated from the end 32e of the fin 32. Therefore, the phenomenon in which the brazing material melted in the furnace moves between the fins 32 due to capillary action is suppressed. Thereby, the concentration of the brazing material is suppressed, and the occurrence of erosion of the brazing material or the fins 32 is reduced.

(6-2) Second Modification FIG. 6 shows a heat exchanger 10 ″ according to a first modification of the first embodiment of the present invention. The heat exchanger 10 ″ is a part of the heat transfer tube unit 30. The heat exchanger tube 31 is different from the heat exchanger 10 ′ according to the first modification of the first embodiment in that the stopper 35 is provided only in the heat transfer tube 31.

According to this configuration, the phenomenon in which the brazing material moves between the fins 32 due to the capillary phenomenon is further suppressed.

Second Embodiment
(1) Configuration FIG. 7 shows a heat exchanger 10A according to the second embodiment of the present invention. In the heat exchanger 10A, at least the second header 22 has a trapezoidal cross-sectional shape. Thereby, the heat transfer tube unit connection surface 23 of the second header 22 is inclined with respect to the heat transfer tube separation direction y. The end 32e of the fin 32 has the shape of the second header 22 so that at least the heat transfer tube unit connection surface 23 of the second header 22 is in contact with the end 31e of the heat transfer tube 31 inserted in the hole 24. It has a matching shape.

According to this configuration, the condensed water that reaches the heat transfer tube unit connection surface 23 through the heat transfer tube unit 30 flows down from the second header 22 due to the inclination. Therefore, the drainage of the heat exchanger 10A is improved.

(2) Modification A modification of the first embodiment may be applied to this embodiment.

<Third Embodiment>
(1) Configuration FIG. 8 shows a heat exchanger 10B according to a third embodiment of the present invention. In the heat exchanger 10B, at least the cross-sectional shape of the second header 22 is pointed upward. Thereby, the heat transfer tube unit connection surface 23 of the second header 22 is composed of two inclined surfaces inclined with respect to the heat transfer tube separation direction y. The end 32e of the fin 32 has the shape of the second header 22 so that at least the heat transfer tube unit connection surface 23 of the second header 22 is in contact with the end 31e of the heat transfer tube 31 inserted in the hole 24. It has a matching shape.

Also with this configuration, the condensed water that reaches the heat transfer tube unit connection surface 23 through the heat transfer tube unit 30 flows down from the second header 22 due to the inclination. Therefore, the drainage of the heat exchanger 10B is improved.

<Fourth embodiment>
(1) Configuration FIG. 9 shows a heat exchanger 10C according to the fourth embodiment of the present invention. In the heat exchanger 10C, at least the second header 22 is a circular pipe. Thereby, most area | regions of the heat exchanger tube unit connection surface 23 of the 2nd header 22 incline with respect to the heat exchanger tube separation direction y. The end 32e of the fin 32 has the shape of the second header 22 so that at least the heat transfer tube unit connection surface 23 of the second header 22 is in contact with the end 31e of the heat transfer tube 31 inserted in the hole 24. It has a matching shape.

According to this configuration, at least the second header 22 is a circular pipe. Therefore, since the second header 22 is easy to manufacture, the heat exchanger 10 can be manufactured more easily.

In addition, due to the inclination of the heat transfer tube unit connection surface 23 of the second header 22, the condensed water that reaches the heat transfer tube unit connection surface 23 through the heat transfer tube unit 30 flows down from the second header 22. Therefore, the drainage of the heat exchanger 10C is improved.

<Fifth Embodiment>
(1) Configuration FIG. 10 is a heat exchanger 10D according to the above-described embodiment of the present invention. In the heat exchanger 10 </ b> D, the first header 21 and the second header 22 are disposed on the same side with respect to the heat transfer tube unit group 39. The first header 21 and the second header 22 are connected to a first pipe 41 and a second pipe 42, respectively.

FIG. 11 shows one of the plurality of heat transfer tube units 30 constituting the heat transfer tube unit group 39 of the heat exchanger 10D. The heat transfer tube unit 30 includes a plurality of heat transfer tubes 31 and at least one fin 32. Each heat transfer tube 31 has at least a portion extending in the heat transfer tube extension direction z, and is preferably linear. The plurality of heat transfer tubes 31 are arranged in the heat transfer tube separation direction y. Furthermore, the adjacent heat transfer tubes 31 are connected by a curved connecting tube 31c. That is, the heat transfer tube unit 30 has one refrigerant path constituted by the heat transfer tube 31 and the connecting tube 31c. This refrigerant path moves the refrigerant between the first header 21 and the second header 22. The end 31 e of the heat transfer tube 31 is connected to any of the heat transfer tube unit connection surfaces 23 of the first header 21 and the second header 22.

The heat transfer tube unit 30 has fins 32 between adjacent heat transfer tubes 31. The fins 32 may be further disposed outside the outermost heat transfer tube 31 of the heat transfer tube unit 30. The plurality of fins 32 may be connected at the upper end or the lower end of the heat transfer tube unit 30. The fin 32 has a side extending in the heat transfer tube extension direction z, and is joined to the heat transfer tube 31 at that side. The fins 32 and the heat transfer tubes 31 are alternately arranged in the heat transfer tube separation direction y. The air is configured to flow in a direction parallel to the yz plane by a fan or the like (not shown). The direction of the air flow may coincide with the heat transfer tube separation direction y. The heat transfer tube unit 30 may be manufactured by a method other than extrusion molding of a metal material.

At the end of the heat transfer tube unit 30, a notch 33 is formed at the fin 32. Due to the presence of the notch 33, the end 32 e of the fin 32 is positioned closer to the center of the heat transfer tube unit 30 than the end 31 e of the heat transfer tube 31 in the heat transfer tube extension direction z. The end portion 32e of the fin 32 is in contact with the heat transfer tube unit connection surface 23 in a state where the end portion 31e of the heat transfer tube 31 is inserted into the holes 24 of the first header 21 and the second header 22. 21 and the shape of the second header 22. This contact location is fixed by brazing or the like, thereby sealing the refrigerant path.

According to this configuration, since three of the four sides of the heat transfer tube unit 30 are open to the surrounding space, the dew condensation water is more easily discharged.

<Sixth Embodiment>
In the embodiments described so far, the heat transfer tube unit arrangement direction x and the heat transfer tube separation direction y are horizontal directions and the heat transfer tube extension direction z is a vertical direction as an example of the arrangement. Instead of this, the heat exchanger 10 may be arranged in another direction. For example, the heat transfer tube separation direction y and the heat transfer tube extension direction z may be a horizontal direction, and the heat transfer tube unit arrangement direction x may be a vertical direction.

DESCRIPTION OF SYMBOLS 10 Heat exchanger 21 1st header 22 2nd header 23 Heat transfer tube unit connection surface 24 Hole 30 Heat transfer tube unit 31 Heat transfer tube 31e End of heat transfer tube 32 Fin 32e End of fin 33 Notch 35 Stopper 36 Gap 41 First Piping 42 Second piping

JP 2013-139965 A

Claims

A heat transfer tube unit (30) having at least one fin (32) and a plurality of heat transfer tubes (31);
Headers (21, 22) to which the heat transfer tube unit is connected;
With
The fins and the heat transfer tubes are alternately arranged,
The plurality of heat transfer tubes extend in a heat transfer tube extension direction (z),
The fin is joined to the heat transfer tube at a side extending in the heat transfer tube extension direction (z),
In the heat transfer tube extension direction (z), the end portion (32e) of the fin is located closer to the center of the heat transfer tube unit than the end portion (31e) of the heat transfer tube,
The header is provided with a hole (24) for inserting the end of the heat transfer tube.
Heat exchanger (10).
The header includes a first header (21) and a second header (22) sandwiching the heat transfer tube unit,
The heat exchanger according to claim 1.
The second header is provided below the first header;
The heat transfer tube unit connection surface (23) of the second header is inclined with respect to the heat transfer tube separation direction,
The heat exchanger according to claim 2.
The header is a circular tube;
The heat exchanger according to any one of claims 1 to 3.
The end of the fin has a shape that matches the shape of the header so that the end of the heat transfer tube is in contact with the header in a state where the end is inserted into the hole.
The heat exchanger according to any one of claims 1 to 4.
The end (32e) of the fin is spaced from the header (21, 22);
The heat exchanger according to any one of claims 1 to 4.
The heat transfer tube unit is
The heat transfer tube (31) further includes a stopper (35) provided at a location between the end (31e) of the heat transfer tube and the end (32e) of the fin,
The stopper has a shape that cannot pass through the hole of the header.
The heat exchanger according to claim 6.
The heat transfer tube unit is a single member.
The heat exchanger according to any one of claims 1 to 7.
Forming a heat transfer tube unit (30) having fins (32) and heat transfer tubes (31);
In order to position the end (32e) of the fin closer to the center of the heat transfer tube unit than the end (31e) of the heat transfer tube in the heat transfer tube extension direction (z), a part of the fin is cut off. Providing a notch (33);
Providing a hole (24) for inserting the end of the heat transfer tube in the header (21, 22);
Inserting the end of the heat transfer tube into the hole;
Brazing the heat transfer tube unit and the header;
A method for manufacturing a heat exchanger.
The step of forming the heat transfer tube unit includes the step of integrally forming the fin and the heat transfer tube by extrusion molding of a metal material.
The manufacturing method of the heat exchanger of Claim 9.
In the step of providing the notch, a plurality of locations of the fin are excised by punching.
The manufacturing method of the heat exchanger of Claim 9 or Claim 10.
In the step of providing the hole, the hole is formed by a drill.
The manufacturing method of the heat exchanger as described in any one of Claim 9 to 11.