JP2013127341A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger that is brazed so as not to mutually connect a plurality of rows of the heat exchanging parts, and to provide a method for manufacturing the heat exchanger.SOLUTION: The plurality of rows of the heat exchanging parts 101 in the heat exchanger are arranged and brazed in a kiln, after that, the plurality of rows of the heat exchanging parts 101 are formed by cold-bending simultaneously. Each heat exchanging part 101 includes: an accumulated flat tube 43; a heat transfer fin 44; and headers 48, 49 connected to an end of the flat tube 43. A gap G is secured between the heat transfer fin 44 of the heat exchanging parts 101 of the first row of the plurality of rows and the heat transfer fin 44 of the heat exchanging parts 101 of the second row next to the first row. The heat transfer fin 44 of the first row is not connected to the heat transfer fin 44 of the second row by a brazing material.

Description

  The present invention relates to a heat exchanger and a method of manufacturing the heat exchanger.

  Conventionally, in heat exchangers such as an evaporator of an air conditioner, a flat tube for heat exchange as shown in Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-153814) has been used. Such a flat tube is integrally formed by extrusion molding or the like of an aluminum alloy or the like, and a large number of through holes are arranged in a line or a plurality of lines. Heat exchange is performed between a refrigerant passing through the inside of the through hole and a medium such as air passing through the outer periphery of the flat tube.

  When manufacturing a heat exchanger using such a flat tube, first, heat transfer fins are attached to the surface of the flat tube. A header is connected to the end of the flat tube. The heat exchanger thus assembled is put into a furnace. Inside the furnace, the brazing material attached to the connection between the flat tube and the heat transfer fins in advance and the end of the flat tube and the header melts, and the flat tube and heat transfer fins, and the flat tube and header are brazed. Is done.

  By the way, in order to enhance the heat exchange capability of the heat exchanger as described above, a method of providing two or more rows of flat tubes laminated in a plurality of stages is conceivable. However, when a heat exchanger having two or more rows of flat tubes stacked in multiple stages is brazed in the furnace, the heat transfer fins of the upper row of flat tubes and the heat transfer fins of the lower row of flat tubes are brazed. May cause malfunction.

  Then, the subject of this invention is providing the heat exchanger brazed so that the heat exchange part of several rows may not mutually join, and its manufacturing method.

  The heat exchanger according to the first aspect of the present invention is a heat exchanger in which a plurality of rows of heat exchange portions are arranged and brazed in a furnace, and then the plurality of rows of heat exchange portions are simultaneously formed by cold bending. The heat exchange unit has a stacked flat tube, a heat transfer fin, and a header connected to the end of the flat tube. A gap is secured between the heat transfer fins of the heat exchange section of the first row of the plurality of rows and the heat transfer fins of the heat exchange portion of the second row adjacent to the first row. The heat transfer fins in the first row and the heat transfer fins in the second row are not joined with the brazing material.

  In the heat exchanger according to the first aspect of the present invention, the heat exchange unit has a header connected to the stacked flat tubes, heat transfer fins, and ends of the flat tubes. A gap is secured between the heat transfer fins of the heat exchange portions of the first row and the second row. As a result, the first row of heat transfer fins and the second row of heat transfer fins are not joined by the brazing material. Accordingly, it is possible to provide a heat exchanger that is brazed so that a plurality of rows of heat exchange portions are not joined to each other.

  The method for producing a heat exchanger according to the second aspect of the present invention is a method for producing a heat exchanger in which a plurality of heat exchange sections are arranged. The heat exchanging unit has a stacked flat tube, a heat transfer fin, and a header connected to an end of the flat tube. An assembly step, a brazing step, and a molding step are included. The assembly step is a step of assembling a plurality of rows of heat exchange units. The brazing step is a step of brazing the assembled plurality of rows of heat exchange sections in a furnace. The forming step is a step of simultaneously forming a plurality of brazed heat exchange portions by cold bending. In the brazing step, a spacer is used in the furnace or a lifting member is used in the furnace. The spacer is a jig for securing a gap between the heat transfer fins of the heat exchange portions of the first row of the plurality of rows and the heat transfer fins of the heat exchange portions of the second row adjacent to the first row. It is. The lifting member is configured such that the heat transfer fins of the first row of heat exchange units are connected to the heat exchange units of the second row in a state where the heat exchange units of the first row are stacked on the heat exchange units of the second row. It lifts so that it may not contact with a heat transfer fin, and a clearance gap is secured between the heat transfer fins of the heat exchange part of the 1st row and the 2nd row.

  In the method of manufacturing the heat exchanger according to the second aspect of the present invention, a spacer that secures a gap between the heat transfer fins is used in the furnace in the brazing step. Alternatively, in the brazing step, a lifting member that lifts the heat transfer fins of the heat exchange section of the upper first row and secures a gap between the heat transfer fins of the upper first row and the lower second row is a furnace. Use within. Accordingly, the heat transfer fins in one row and the heat transfer fins in the other row are not joined by the brazing material. Therefore, in the method for manufacturing a heat exchanger according to the second aspect of the present invention, it is possible to manufacture a heat exchanger that is brazed so that a plurality of rows of heat exchange portions are not joined to each other.

  In the heat exchanger which concerns on the 1st viewpoint of this invention, it is possible to provide the heat exchanger brazed so that the heat exchange part of several rows may not mutually join.

  In the method of manufacturing the heat exchanger according to the second aspect of the present invention, it is possible to manufacture a heat exchanger that is brazed so that the plurality of rows of heat exchange portions are not joined to each other.

The external view of the heat exchanger which concerns on this invention. The enlarged view of the II section of FIG. The figure which expanded and looked at the III section of FIG. 2 from diagonally. The schematic top view of the heat exchanger which concerns on this invention. The flowchart of the method of manufacturing the heat exchanger which concerns on this invention. The assembly image figure of the heat exchanger which concerns on this invention. The image figure of the state in the furnace of the heat exchanger which concerns on this invention. The image figure of the cold bending of the heat exchanger which concerns on this invention. The image figure of the state in the furnace of the heat exchanger which concerns on this invention.

(1) Overall Configuration FIG. 1 is a perspective view of the appearance of a heat exchanger 100 that is an example of a heat exchanger according to the present invention. FIG. 2 is an enlarged view schematically showing details of a portion II in FIG. FIG. 3 is an enlarged view of portion III in FIG. FIG. 4 is a plan view schematically showing the heat exchanger 100 shown in FIG. 1 from above.

  The heat exchanger 100 is a microchannel heat exchanger and includes a plurality of rows of heat exchange units 101. The heat exchanging unit 101 exchanges heat between the refrigerant flowing inside and the air.

  Each row of heat exchange units 101 includes a flat tube 43, heat transfer fins 44, and headers 48 and 49. The plurality of flat tubes 43 are stacked as shown in FIG. Heat transfer fins 44 are attached to the surface of each flat tube 43. The laminated flat tubes 43 and the heat transfer fins 44 are collectively referred to as a fin-tube laminated body 102a.

  Both ends of each flat tube 43 are connected to headers 48 and 49 as shown in FIG. There are two types of headers 48 and 49, and the fin-tube laminate 102 is connected to the first header 48 one by one. On the other hand, two fin-tube laminates 102, that is, two rows of heat exchange units 101 are connected to the second header 49. That is, the second header 49 is shared by the two heat exchange units 101. Thus, the heat exchanger 100 has a total of two rows of heat exchange units 101.

  Hereinafter, for convenience, the heat exchange unit 101 in one row is referred to as a first heat exchange unit 101a, and the heat exchange unit 101 in the other row is referred to as a second heat exchange unit 101b. The 1st heat exchange part 101a is the heat exchange part 101 of the inner row | line | column of the heat exchanger 100 used as the U shape as shown in FIG. The second heat exchange unit 101b is the heat exchange unit 101 in the outer row. The second heat exchange unit 101b is longer than the first heat exchange unit 101a, that is, extends longer in the horizontal direction than the first heat exchange unit 101a. As shown in FIG. 4, the first header 48 of the first heat exchanging part 101a and the first header 48 of the second heat exchanging part 101b are in a state in which the heat exchanger 100 is formed in a U-shape. They are lined up side by side, but are not in contact with each other. Further, a gap G is provided between the first heat exchange unit 101a and the second heat exchange unit 101b (see FIG. 4).

(2) Detailed Configuration Hereinafter, the detailed configuration of the heat exchanger 100 will be described with reference to FIGS.

  As described above, the heat exchanger 100 includes a plurality of rows of heat exchange units 101. The heat exchange unit 101 includes a plurality of stacked flat tubes 43 and heat transfer fins 44 disposed between the flat tubes 43.

(2-1) Flat tube 43
The flat tube 43 is a plate-like aluminum or aluminum alloy tube member that is elongated in a direction (specifically, a horizontal direction) perpendicular to the longitudinal direction (vertical direction) of the headers 48 and 49. The plurality of flat tubes 43 are arranged side by side in the vertical direction (vertical direction) so that the wide flat surface portion 43b extending in the horizontal direction faces the vertical direction (vertical direction) and each has a predetermined interval. Has been. The flat tube 43 is formed with a plurality of refrigerant flow passage holes 43a (see FIG. 3) for circulating the refrigerant so as to penetrate in the longitudinal direction (horizontal direction).

(2-2) Heat transfer fin 44
The heat transfer fins 44 are made of aluminum or aluminum alloy having a corrugated shape. Specifically, the heat transfer fins 44 are longer in the width direction than the length L1 in the width direction of the flat tube 43 (specifically, the direction perpendicular to the horizontal direction with respect to the longitudinal direction of the flat tube 43). A plate-like member having a large length L2 is configured by being bent into a waveform along the longitudinal direction of the flat tube 43 so that a crest portion and a trough portion are formed. Since the heat transfer fins 44 are arranged between the flat tubes 43, a wider heat transfer area is ensured, and therefore, the refrigerant flowing through the flat tubes 43 (the plurality of refrigerant flow path holes 43 a) and the heat exchange unit 101. Heat is efficiently exchanged with the passing air passing outside.

  The heat transfer fin 44 has an H-shape when viewed along the longitudinal direction of the flat tube 43, and has a fin body portion 45 and a fin edge portion 46 as shown in FIG. ing.

  The fin main body 45 is formed between the flat tubes 43 (specifically, the upper surface 43c, which is the upper surface of the flat portion 43b of the flat tube 43, and the flat surface of the flat tube 43 adjacent to the flat tube 43 in the vertical direction). It is a part arrange | positioned between the lower surface 43d which is the lower surface of the part 43b. The fin main body 45 is fixed to the flat tube 43 such that the upper end 45a of the peak portion is in contact with the lower surface 43d and the lower end 45b of the valley portion is in contact with the upper surface 43c. In addition, the contact location of the flat tube 43 and the fin main-body part 45 is joined by brazing.

  In the fin main body 45, in order to improve heat exchange efficiency, a plurality of cut-and-raised portions 45c are formed by cutting up the central portion of the fin main-body portion 45 in the vertical direction. The cut-and-raised portion 45c is cut and raised in a louver shape, and is formed such that the direction of inclination with respect to the flow direction of the passing air C is reversed between the upstream portion and the downstream portion in the flow direction of the passing air C. ing.

  The fin edge portion 46 is a portion protruding from the fin body portion 45 toward the outer side in the width direction of the flat tube 43 (specifically, both outer sides in the width direction). The height position of the upper end of the upper end portion 46 a of the fin edge 46 is located above the lower surface 43 d of the flat tube 43, and the height position of the lower end of the lower end portion 46 b of the fin edge 46 is the flat tube 43. It is located below the upper surface 43c. This is because the fin body portion 45 is formed when the heat transfer fins 44 are formed by bending the plate-like member into a corrugated shape by previously forming incisions along the width direction at both ends in the width direction of the plate-like member. This is achieved by keeping only the bend. That is, by previously forming the above-mentioned notches in the plate-like member, the upper end portion 46a and the lower end portion 46b of the fin edge portion 46 are maintained in a state of being cut and raised without being bent. In addition, the upper end of the upper end part 46a of the fin edge part 46 and the lower end of the lower end part 46b are comprised so that it may extend in a horizontal direction.

  In the present embodiment, the fin edges 46 of the heat transfer fins 44 adjacent in the vertical direction are in contact with each other (specifically, the upper end of the upper end 46a of the fin edge 46 and the lower end of the fin edge 46). The heat transfer fins 44 are configured so that the lower end of the portion 46b comes into contact with each other. As a result, the water condensed on the heat exchange unit 101 flows outside the heat exchange unit 101 through the heat transfer fins 44.

(2-3) Headers 48 and 49
The headers 48 and 49 are arranged so as not to contact each other and to extend in the vertical direction. The headers 48 and 49 are members made of cylindrical metal (specifically, aluminum, aluminum alloy, etc.) whose upper and lower ends are closed.

  The first header 48 is formed with an opening 40 a for allowing the refrigerant to flow into the heat exchange unit 101 or for allowing the refrigerant to flow out of the heat exchange unit 101. In the case of the first header 48 of the first heat exchanging part 101a, an opening 40a for allowing the refrigerant to flow into the heat exchanging part 101 or for allowing the refrigerant to flow out of the heat exchanging part 101 is formed in the upper part thereof. ing. In the case of the first header 48 of the second heat exchange unit 101b, an opening 40a is formed in a lower portion thereof. The first header 48 is formed therein with a refrigerant channel 48a communicating with the opening 40a. The coolant channel 48 a is formed so that the coolant flows in the vertical direction, and communicates with a plurality of coolant channel holes 43 a formed in the flat tube 43.

  The second header 49 is also formed with a coolant channel 49a for circulating the coolant. The refrigerant channel 49 a is formed so that the refrigerant flows in the vertical direction, and communicates with a plurality of refrigerant channel holes 43 a formed in the flat tube 43.

(2-4) Flow of Refrigerant in Heat Exchanger 100 When the heat exchanger 100 functions as a heat radiator of the refrigerant, the right-side second flow from the first header 48 of the first heat exchange unit 101a toward the plane of FIG. The refrigerant flows to the second header 49 and then flows from the second header 49 to the first header 48 of the second heat exchange unit 101b. Specifically, the high-pressure refrigerant flows into the refrigerant flow path 48a of the first header 48 through the opening 40a of the first header 48 of the first heat exchange unit 101a. The refrigerant flowing into the refrigerant flow path 48 a is divided into a plurality of flat tubes 43 and distributed to a plurality of refrigerant flow hole 43 a formed in each flat tube 43 to be formed in the second header 49. It flows to the refrigerant flow path 49a. And the refrigerant | coolant which flowed into the refrigerant flow path 49a flows in into the 2nd heat exchange part 101b. The refrigerant flowing into the second heat exchange unit 101b is divided into a plurality of flat tubes 43 and distributed to a plurality of refrigerant flow passage holes 43a formed in each flat tube 43, so that the second heat exchange unit 101b It flows to the refrigerant flow path 48 a formed in the first header 48. The refrigerant flowing into the refrigerant flow path 48 a flows out of the heat exchanger 100 through the opening 40 a formed in the first header 48. Thus, while flowing through the heat exchanger 100, the high-pressure refrigerant is radiated and cooled by exchanging heat with the passing air passing outside.

  On the other hand, when the heat exchanger 100 functions as a refrigerant evaporator, the refrigerant passes from the first header 48 of the second heat exchange unit 101b to the first header 48 of the first heat exchange unit 101a via the second header 49. Will flow. Specifically, the low-pressure gas-liquid two-phase refrigerant flows into the refrigerant flow path 48a through the opening 40a of the first header 48 of the second heat exchange unit 101b. The refrigerant that has flowed into the refrigerant flow path 48 a is divided into a plurality of flat tubes 43, and is distributed to a plurality of refrigerant flow passage holes 43 a formed in each flat tube 43 to be formed in the second header 49. It flows to the flow path 49a. And the refrigerant which flowed into refrigerant channel 49a flows into the 1st heat exchange part 101a. The refrigerant that has flowed into the first heat exchange unit 101a is divided into a plurality of flat tubes 43, and is distributed to a plurality of refrigerant flow passage holes 43a formed in each flat tube 43, so that the first heat exchange unit 101a It flows to the refrigerant flow path 48 a formed in the first header 48. The refrigerant flowing into the refrigerant flow path 48 a flows out of the heat exchanger 100 through the opening 40 a formed in the first header 48. Thus, while flowing in the heat exchanger 100, the low-pressure gas-liquid two-phase refrigerant is heated and evaporated by exchanging heat with the passing air passing outside.

  As described above, the refrigerant flowing in the heat exchanger 100 flows downward from above when functioning as a radiator, and flows upward from below when functioning as an evaporator.

(3) Manufacturing Method FIG. 5 is a flowchart showing a method for manufacturing the heat exchanger 100. As shown in FIG. 4, the heat exchanger 100 is manufactured through an assembly step S101, a brazing step S102, and a molding step S103 in order.

(3-1) Assembly step S101
In the assembly step S101, a plurality of rows of heat exchange units 101 are assembled.

  First, as many straight pipes 43 as necessary for a predetermined number of stacking stages (100 to 300 stages) are prepared. Further, as many heat transfer fins 44 as necessary for a predetermined number of stacked layers (100 to 300) are prepared. Then, as described with reference to FIG. 3 above, the heat-transfer fins 44 and the flat tubes 43 are alternately laminated in a plurality of stages to form the fin-tube laminate 102a.

  Next, the longitudinal ends 14 and 15 of the plurality of flat tubes 43 are inserted into the headers 48 and 49 (see FIG. 6). Specifically, the insertion holes 22 and 32 are formed in the headers 48 and 49, and the headers 48 and 49 are moved from the direction of the arrow L in FIG. 6 to the longitudinal ends 14 and 15 of the plurality of flat tubes 43. By bringing them closer, the longitudinal ends 14 and 15 of the plurality of flat tubes 43 are inserted into the insertion holes 22 and 32 of the headers 48 and 49. As a result, the heat exchanger core temporary assembly 102b is formed.

  Note that a brazing material containing aluminum as a component is attached in advance to the surface of the flat space 43 and the periphery of the insertion holes 22 and 32 of the headers 48 and 49.

(3-2) Brazing step S102
In the brazing step S102, the heat exchange core temporary assembly 102b is joined by brazing. Specifically, the heat exchanger core temporary assembly 102b is put into a brazing furnace. In the furnace, the brazing material adhered in advance around the surface of the flat space 43 and around the insertion holes 22 and 32 of the headers 48 and 49 is melted, and between the flat tube 43 and the heat transfer fins 44 and between the flat tube 43 and the header 48. , 49 are brazed. The flat tube 43 and the heat transfer fin 44 are joined by brazing between the flat portion 43 b and the lower end 45 b of the heat transfer fin 44. Further, the flat tube 43 and the headers 48 and 49 are joined by brazing the longitudinal end portions 14 and 15 and the peripheral portions of the insertion holes 22 and 32. Thereby, the flat heat exchanger 100a is obtained (refer FIG. 8). The temperature in the furnace is controlled to reach about 610 ° C.

  Here, when brazing, the first heat exchange unit 101a and the second heat exchange unit 101b may be joined. This is because the heat exchange core temporary assembly 102b is placed in the furnace in a state where the plurality of rows of heat exchanging portions 101 overlap in the vertical direction during brazing. When the heat exchanger core temporary assembly 102b is brazed in the furnace in a state where the heat exchanging portions 101 overlap with each other in this manner, the upper row of the heat exchanging portions 101 (the first heat exchanging portion 101a in FIG. 7). There is a possibility that the heat transfer fins 44 and the heat transfer fins 44 of the lower row heat exchange portions 101 (second heat exchange portion 101b in FIG. 7) are brazed and joined. If the heat transfer fins 44 are joined together, the heat transfer fins 44 joined at the time of cold bending in the next forming step S103 may be broken and deformed. If the heat transfer fins 44 are broken and deformed, problems such as a decrease in heat exchange efficiency may occur, and the path through which condensed water flows is blocked, resulting in poor drainage. Therefore, in this embodiment, a member called a plate-like spacer 110 made of a heat resistant material such as a heat resistant resin is sandwiched between the upper heat exchanging portion 101 and the lower heat exchanging portion 101, and A gap G1 is secured between the heat exchanging portions 101, and the heat exchanger core temporary assembly 102b is placed in the furnace in this state. Thereby, it can suppress joining the several heat exchange parts 101 in the case of brazing. As a result, it is possible to suppress the occurrence of problems such as drainage and deterioration of heat exchange performance.

(3-3) Molding step S103
In the forming step S103, the plurality of brazed heat exchange units 101 are simultaneously formed by cold bending. In the cold bending, a flat plate heat exchanger 100a is bent using a bending apparatus 120 as shown in FIG. The plate-shaped heat exchanger 100a is spaced a little apart, and the two portions are sandwiched and fixed by the fixing portion 121 and the bending portion 122, respectively. In this state, the bending portion 122 is moved in the direction of arrow X by an actuator (not shown). As a result, the flat heat exchanger 100a bends in the direction of the arrow X. As a result, as shown in FIGS. 1 and 4, the heat exchanger 100 bent in a substantially U shape in plan view is completed.

(4) Features (4-1)
In the above embodiment, the heat exchanger 100 is a heat exchanger 100 in which a plurality of rows of heat exchange units 101 are arranged and brazed in a furnace, and then the plurality of rows of heat exchange units 101 are simultaneously formed by cold bending. . The heat exchanging unit 101 includes stacked flat tubes 43, heat transfer fins 44, and headers 48 and 49 connected to the end portions 14 and 15 of the flat tubes 43. A gap G is secured between the heat transfer fins 44 of the first heat exchange unit 101a and the heat transfer fins 44 of the second heat exchange unit 101b adjacent to the first heat exchange unit 101a. Thereby, the heat transfer fin 44 of the 1st heat exchange part 101a and the heat transfer fin 44 of the 2nd heat exchange part 101b are not joined by brazing material. Therefore, it is possible to provide a heat exchanger that is brazed so that the heat exchange units 101 in a plurality of rows are not joined to each other.

(4-2)
In the above embodiment, the method for manufacturing the heat exchanger 100 includes the assembly step S101, the brazing step S102, and the molding step S103. The assembly step S101 is a step of assembling a plurality of rows of heat exchange units 101. The brazing step S102 is a step of brazing the assembled plurality of rows of heat exchange units 101 in a furnace. The forming step S103 is a step of simultaneously forming the plurality of brazed heat exchange units 101 by cold bending. In the brazing step S102, the spacer 110 is sandwiched between the heat transfer fins 44 of the first heat exchanging part 101a and the heat transfer fins 44 of the second heat exchanging part 101b adjacent to the first heat exchanging part 101a. A gap G1 is secured between the exchange unit 101a and the second heat exchange unit 101b. Accordingly, the heat transfer fins 44 in one row and the heat transfer fins 44 in the other row are not joined by the brazing material. Therefore, it is possible to manufacture the heat exchanger 100 that is brazed so that the plurality of rows of heat exchange units 101 are not joined to each other.

(5) Modification (5-1) Modification 1A
In the above embodiment, the heat exchanger core temporary assembly 102b is placed in the furnace in a state where the spacer 110 is sandwiched between the upper and lower rows of heat exchanging portions 101 and the gap G1 is secured between the upper and lower rows of heat exchanging portions 101. And brazed. However, in another embodiment, as shown in FIG. 9 instead of sandwiching the spacer 110, the upper row of heat exchange units 101 (in FIG. 9, the first heat exchange unit 101 a) is replaced with a lifting member 210. The heat exchanger core temporary assembly 102b is placed in the furnace in a state where a gap G2 is secured between the heat exchanger 101 in the lower row and the heat exchanger 101 (the second heat exchanger 101b in FIG. 9). And brazing. The lifting member 210 is made of, for example, a hard heat-resistant material such as a brick, and has a long rectangular contact portion 211 placed in contact with the plane F on which the heat exchange core temporary assembly 102b is placed. A support portion 212 extending between the heat exchanging portion 101 in the row and the heat exchanging portion 101 in the lower row is joined. The support part 212 is in contact with the heat exchange unit 101 in the upper row, and prevents the heat exchange unit 101 in the upper row from coming into contact with the heat exchange unit 101 in the lower row. Accordingly, the heat transfer fins 44 in one row and the heat transfer fins 44 in the other row are not joined by brazing. Therefore, it is possible to manufacture the heat exchanger 100 that is brazed so that the plurality of rows of heat exchange units 101 are not joined to each other.

  The present invention can be used for a heat exchanger such as an air conditioner.

43 Flat tube 44 Heat transfer fins 48, 49 Header 100 Heat exchanger 101 Heat exchange part 110 Spacer 210 Lifting members G, G1, G2 Gap

JP 2011-153814 A

Claims (2)

A plurality of rows of heat exchange portions (101) having stacked flat tubes (43), heat transfer fins (44), and headers (48, 49) connected to the ends (14, 15) of the flat tubes. A heat exchanger (100) in which the plurality of rows of heat exchange parts are simultaneously formed by cold bending after being brazed in a furnace,
A gap (G) is secured between the heat transfer fins of the heat exchange section of the first row of the plurality of rows and the heat transfer fins of the heat exchange portion of the second row adjacent to the first row. ,
The heat transfer fins of the first row and the heat transfer fins of the second row are not joined with a brazing material,
Heat exchanger (100). Heat in which a plurality of rows of heat exchange parts (101) having stacked flat tubes (43), heat transfer fins (44), and headers (48, 49) connected to the ends (14, 15) of the flat tubes are arranged. A method of manufacturing an exchanger (100), comprising:
An assembly step (S101) for assembling the plurality of rows of heat exchange units;
Brazing step (S102) of brazing the assembled plurality of rows of heat exchange sections in a furnace;
A molding step (S103) for simultaneously molding the plurality of rows of heat exchange portions brazed by cold bending;
Including
In the brazing step,
For securing a gap (G1) between the heat transfer fins of the heat exchange section of the first row of the plurality of rows and the heat transfer fins of the heat exchange portion of the second row adjacent to the first row. A spacer (110), which is a jig, is used in the furnace, or the first row of heat exchange portions are stacked on the second row of heat exchange portions. The heat transfer fins of the heat exchange unit are lifted so as not to contact the heat transfer fins of the heat exchange unit of the second row, and the heat transfer fins of the heat exchange units of the first row and the second row are interposed between the heat transfer fins. A lifting member (210) that secures a gap (G2) is used in the furnace,
A method of manufacturing a heat exchanger.

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