JP2006132904A - Fin manufacturing method, fin, and heat exchanger using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrugated fin suitably arranged between facing plate parts. <P>SOLUTION: In the fin 60 of corrugated cross section, a top part 62A of a fin end part (a cut part) 61 out of top parts 62, 62 of corrugated shape is provided with a small curve part 63 receding toward the opposite side to the contact side with the plate part 41a. A burr 64 formed at the fin end part (the cut part) 61 in a manufacturing process of the fin 60 (a cutting process of a corrugated metal plate 60B) is thereby reduced in projecting quantity from the amplitude range H of corrugation because of the recess of the small curve part 63. In the state of clamping the fin 60 between the facing plate parts 41a, 41a, the amount of interference between the burr 64 and the plate part 41a is thereby reduced or eliminated. As a result, the joined state of the fin 60 and plate part 41a is improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fin, for example, a fin used in a heat exchanger or the like.

Conventionally, fins having a corrugated shape for improving heat exchange efficiency have been used in heat exchangers and heat radiating portions of machine elements (for example, Patent Documents 1 and 2). This type of corrugated fin is sandwiched between flat plate portions that define flow paths between different heat exchange media (for example, refrigerant and air). The fin is manufactured by processing a flat metal plate into a corrugated cross-section with an opposing forming gear and then cutting it into a predetermined length.
JP 2001-38439 A JP 2003-181544 A

  If burrs generated in the cutting process of the fin manufacturing process protrude beyond the amplitude range of the waveform, there is a risk of poor contact between the fin and the flat plate portion.

  In particular, in the case of an inner fin sandwiched in the tube, if the burr protrudes greatly, there is a possibility that a gap is formed between the joining surfaces of the two metal plates constituting the tube, thereby forming a leak hole. .

  The present invention has been made in view of the above points, and an object thereof is to provide a corrugated fin suitable for being disposed between opposing flat plate portions.

  The invention according to claim 1 is a corrugated fin, and a top portion having a cut portion among corrugated top portions includes a small curved portion that is recessed toward a side opposite to the side in contact with the flat plate portion. It is characterized by.

  The invention of claim 2 is a heat exchanger comprising flat plate portions provided in multiple stages so as to partition the flow path of the heat exchange medium, and corrugated fins sandwiched between the flat plate portions. And the said fin is provided with the small curved part dented toward the opposite side to the side which contacts the said flat plate part in the top part with a cutting part among the top parts of a waveform.

  According to a third aspect of the present invention, there are provided a plurality of flat tubes provided in a plurality of stages, a header tank that communicates with the opening end of the tube, and merges and distributes the refrigerant flowing through the tube, and the tube is opposed to the tube. A corrugated inner fin sandwiched between flat plate portions, wherein the inner fin is on the side contacting the flat plate portion at the top portion of the corrugated top portion where the cut portion is present It is characterized by including a small curved portion that is recessed toward the opposite side.

  According to a fourth aspect of the present invention, a plurality of flat tubes provided in a plurality of stages, a header tank for merging / distributing refrigerant flowing through the tubes communicating with the open ends of the tubes, and a sandwich between adjacent tubes are provided. A corrugated outer fin, wherein the outer fin is a small portion of the corrugated top that is recessed toward the side opposite to the side in contact with the tube at the top where the cut portion is located. A curved portion is provided.

  The invention of claim 5 is a method of manufacturing a fin, wherein a flat metal plate is formed in a corrugated cross-section, and at least one of the tops of the corrugations has a small curved part that is recessed inward in the amplitude direction. It forms and cut | disconnects in the top part provided with a small curved part among the top parts of a waveform.

  A sixth aspect of the present invention is the method of manufacturing a fin according to the fifth aspect, wherein at least one of the tops of the corrugations is formed by forming a flat metal plate into a corrugated shape as a whole by a pair of opposing formed gears. A small curved portion that is recessed toward the inner side in the amplitude direction is formed at one top portion.

  According to the first aspect of the present invention, the amount protruding from the amplitude range of the burr wave generated in the fin manufacturing process (cutting the corrugated metal plate) is reduced by the dent of the small curved portion. Therefore, when the fin is sandwiched between the opposing flat plate portions, the amount of interference between the burr and the flat plate portion is reduced or eliminated, and the bonding state between the fin and the flat plate portion is improved.

  According to the second aspect of the present invention, the amount of burr generated in the fin manufacturing process (cutting the corrugated metal plate) is reduced by the depression of the small curved portion and the amplitude range of the wave. Therefore, the amount of interference between the burr and the flat plate portion is reduced or eliminated, and the bonding state between the fin and the flat plate portion is improved.

  According to the third aspect of the present invention, the amount of burr generated in the inner fin manufacturing process (cutting the corrugated metal plate) is reduced from the dent of the small curved portion and the amplitude range of the wave. Therefore, the amount of interference between the burr and the flat plate portion of the tube is reduced or eliminated, and the joined state between the inner fin and the tube is improved.

  According to the fourth aspect of the present invention, the amount of burr generated in the outer fin manufacturing process (cutting the corrugated metal plate) decreases from the dent of the small curved portion and the amplitude range of the wave. Therefore, the amount of interference between the burr and the tube is reduced or eliminated, and the joined state between the outer fin and the tube is improved.

  According to the fifth aspect of the present invention, the amount of burr generated in the fin manufacturing process (cutting the corrugated metal plate) decreases from the dent of the small curved portion and the amplitude range of the wave. For this reason, when the manufactured fin is sandwiched between the opposed flat plate portions, the amount of interference between the burr and the flat plate portion is reduced or eliminated, and the bonding state between the fin and the flat plate portion is improved.

  The invention of claim 6 can combine two steps into one step. That is, the process of making a flat metal plate into a cross-sectional corrugated metal plate and the process of forming a small curved portion on the corrugated metal plate can be combined. Thereby, manufacturing cost can be reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

“First Embodiment”
1-7 is a figure explaining 1st Embodiment of this invention.

Evaporator First, the evaporator (heat exchanger) of this embodiment will be described. The evaporator 1 is an evaporator interposed in a refrigeration cycle of an automobile air conditioner, and is installed in an air conditioning case arranged inside an instrument panel. The evaporator performs heat exchange between the refrigerant flowing inside and the air passing outside, and evaporates the refrigerant to cool the air.

  As shown in FIG. 1 and FIG. 2, the evaporator 1 is a two-layer type in which a refrigerant heat exchanger 10 and a refrigerant outlet 20 are arranged on the windward side and the leeward side. It is an evaporator.

  The inlet-side heat exchange unit 10 includes an upper tank 11, a lower tank 12, and a plurality of heat exchange passages 31 that are connected in communication between the tanks 11 and 12. On the other hand, the outlet side heat exchanging unit 20 includes an upper tank 21, a lower tank 22, and a plurality of heat exchange passages 31 connected in communication between the tanks 21 and 22. Partitions (not shown) are provided in the tanks 11, 12, 21, and 22 of the heat exchange units 10 and 20. Thereby, each heat exchanging part 10 and 20 is divided into a plurality of passes, and the refrigerant meanders and flows in each heat exchanging part 10 and 20.

  When the refrigerant is introduced from the refrigerant inlet 7 of the inlet-side heat exchange unit 10, the refrigerant flows through the inlet-side heat exchange unit 10 and then flows into the outlet-side heat exchange unit 20 through the communication unit 9. The refrigerant that has flowed into the outlet side heat exchange unit 20 flows through the outlet side heat exchange unit 20, and is then discharged from the refrigerant outlet 8 to the outside of the evaporator 1. Thus, when the refrigerant is circulating in the evaporator 1, heat exchange is performed between the refrigerant flowing in the tube 30 and the air flowing between the tubes 30 and 30.

  Next, the manufacturing method of the evaporator 1 of this 1st Embodiment is demonstrated. The tubes 30 are stacked in a plurality of stages with outer fins 33 interposed therebetween, and strength reinforcing side plates 35 and 37 and piping connectors 36 are attached to the outermost side in the tube stacking direction (horizontal outermost side). Assemble in shape and fix with jig. By heating in this state, the brazing material on the surface of each member is melted and the members are brazed together to obtain the desired evaporator (see FIGS. 1 and 2). 1 and 2, reference numeral 34 denotes an outermost metal plate.

Tube Next, the tube will be described with reference to FIG.

  As shown in FIG. 3, the tube 30 to be used is formed by aligning a pair of metal plates 40 (40A, 40B) in the middle. In the pair of metal plates 40 (40A, 40B), the peripheral joint portions 40b and the central partition portions 40a are joined to each other. Inside the tube 30, two heat exchange passages 31, 31 are formed through which a refrigerant flows through a central partition 30 a. In addition, tank portions 32 and 32 that protrude in a cylindrical shape from the both end portions of each heat exchange passage 31 toward the outside in the stacking direction are formed.

  Correspondingly, each metal plate 40 forming the tube 30 has two heat exchange passage recesses 41 and four tank portions 42 to form the two passages 31 and the four tank portions 32. And. In this embodiment, the metal plate 40A and the metal plate 40B have the same shape and the metal plate 40A turned upside down becomes the metal plate 40B. However, even if the metal plate 40A and the metal plate 40B have different shapes. Good.

Inner Fins As shown in FIGS. 3 and 4, inner fins 60, 60 having a corrugated cross section are disposed in the tube 30 while being sandwiched between a pair of metal plates 40. The inner fin 60 is integrally joined to the pair of metal plates 40 by brazing. The inner fins 60, 60 serve to increase the rigidity of the tube, and also increase the heat exchange efficiency by expanding the internal surface area of the tube 30.

  The inner fin 60 is sandwiched between the flat plate portion 41a of the heat exchange passage recess 41 of one metal plate 40A and the flat plate portion 41a of the heat exchange passage recess 41 of the other metal plate 40B. That is, the top portion 62 (mountain or valley) of the inner fin 60 is in contact with the flat plate portion 41a. The amplitude H of the inner fin 60 and the distance between the corresponding flat plate portions 41a and 41a coincide with each other. As shown in FIG. 4, the wave amplitude H of the inner fin 60 and the heat exchange passage for the metal plate 40 are used. The relationship with the depth D of the recess 41 is H = 2 × D.

  Here, if the burr generated in the cutting process when the inner fin 60 is manufactured protrudes greatly from the amplitude range H of the inner fin 60, the joining state of the inner fin 60 and the flat plate portion 41a may become unstable. is there. Therefore, in the inner fin 60 of this embodiment, the following devices are made.

  Next, the structure of the inner fin 60 will be described with reference to FIG.

  In the inner fin 60, both ends 61, 61 in the width direction (that is, cut portions in the manufacturing process) are set at the wave top portions 62 (peaks or troughs), and the top portions 62A of the width direction both ends (cut portions) 61, 61 are , A small curved portion 63 that is recessed toward the inside in the amplitude direction Z is provided. Accordingly, the amount of the burr 64 generated in the manufacturing process of the fin 60 (the cutting process of the corrugated metal plate 60 </ b> B) decreases from the amplitude range H of the wave corresponding to the amount d of the small curved portion 63. . In the inner fin 60, the protrusion amount of the burr 64 outside the amplitude range H is preferably 0.4 mm or less, more preferably 0.1 mm or less. In this embodiment, the burr 64 is completely within the amplitude range H.

Next, a method for manufacturing the inner fin 60 will be described with reference to FIGS.

  First, as shown in FIG. 6a, a flat metal plate 60A is supplied to a pair of opposed formed gears 51, 51 to be processed into a corrugated metal plate 60B. The pair of formed gears 51 and 51 are rotated in conjunction with each other so that their tooth portions 51a mesh with each other. The gears 51 and 51 are provided with tooth portions (not shown) having shapes different from those of the other tooth portions in order to process the small curved portion 63. The processed corrugated metal plate 60B has apexes 62 (mountains and valleys) at a constant pitch P as shown in FIG. 6b. A small curved portion 63 that is recessed toward the inner side in the amplitude direction Z is formed on the top portion 62A that is to be cut (61) among the many top portions 62.

  Next, as shown in FIGS. 7a and 7b, the corrugated metal plate 60B is cut into a predetermined width W by the cutting tools 53a and 53b to obtain the fin 60 to be obtained. In this cutting process, cutting is performed at the small curved portion 63 of the corrugated metal plate 60B.

Outer Fin In this embodiment, the outer fin 33 sandwiched between the flat plate portions 41a and 41a of the tube 30 is also obtained by the same structure and manufacturing method as the inner fin 60 described above, although the size is different. The description of the manufacturing method and the operational effects is omitted.

Effects Next, the effects of the first embodiment will be summarized.

  (1) The fins 60, 33 of the first embodiment are fins 60, 33 having a corrugated cross section sandwiched between the opposing flat plate portions 41a, 41a, and are cut portions of the corrugated top portion 62. A small curved portion 63 that is recessed toward the side opposite to the side in contact with the flat plate portions 41a and 41a is provided on the top portion 62A having 61.

  Therefore, the amount of the burr 64 generated in the manufacturing process of the fins 60 and 33 (the cutting process of the corrugated metal plate 60 </ b> B) decreases from the wave amplitude range H corresponding to the amount of recess d of the small curved portion 63. Therefore, when the fins 60 and 33 are sandwiched between the opposing flat plate portions 41a and 41a, the amount of interference between the burr 64 and the flat plate portion 41a of the fin end portion 61 is reduced, and the fins 60 and 33 and the flat plate portion 41a are reduced. The bonding state of is improved.

  In particular, when the burr 64 is completely within the wave amplitude range H as in the first embodiment, the burr 64 does not interfere with the flat plate portion 41a in the assembled state, and the fins 60, 33 and the flat plate portion 41a. The bonding state with is the best.

  (2) The heat exchanger 1 of the first embodiment includes flat plate portions 41a, 41a,... Provided in multiple stages so as to partition the flow path of a heat exchange medium (air, refrigerant, or other heat exchange medium). And fins 60 and 33 having a corrugated cross section sandwiched between the flat plate portions 41a and 41a, and the fins 60 and 33 are formed by the cutting portion 61 of the corrugated top portion 62. A small top portion 62A is provided with a small curved portion 63 that is recessed toward the side opposite to the side in contact with the flat plate portion 41a.

  Therefore, the amount of the burr 64 generated in the manufacturing process of the fins 60 and 33 (the cutting process of the corrugated metal plate 60 </ b> B) decreases from the wave amplitude range H corresponding to the dent amount d of the curved portion 63. Therefore, the amount of interference between the burr 64 and the flat plate portion 41a of the fin end portion 61 is reduced, and the bonding state between the fins 60 and 33 and the flat plate portion 41a is improved.

  In particular, when the burr 64 is completely within the wave amplitude range H as in the first embodiment, the burr 64 does not interfere with the flat plate portion 41a in the assembled state, and the fins 60, 33 and the flat plate portion 41a. The bonding state with is the best.

  (3) The heat exchanger 1 of the first embodiment includes a plurality of flat tubes 30, 30,... Provided in a plurality of stages, and refrigerant that communicates with the open ends of the tubes 30 and flows through the tubes 30. Heat provided with header tanks 11, 12, 21, 22 for merging and distributing, and inner fins 60 having a corrugated cross-section sandwiched between the opposed flat plate portions 41 a, 41 a of the tube 30 inside the tube 30. In the exchanger 1, the inner fin 60 includes a small curved portion 63 that is recessed toward a side opposite to the side in contact with the flat plate portion 41 a at the top portion 62 </ b> A where the cutting portion 61 is provided among the wave-shaped top portions 62. .

  Therefore, the burr 64 of the fin end 61 generated in the manufacturing process of the inner fin 60 (the cutting process of the corrugated metal plate 60 </ b> B) has an amount that protrudes from the wave amplitude range H corresponding to the amount of depression d of the curved portion 63. Decrease. Therefore, the amount of interference between the burr 64 and the flat plate portion 41a of the fin end portion 61 is reduced, and the joined state between the inner fin 60 and the flat plate portion 41a is improved.

  In particular, when the burr 64 is completely within the wave amplitude range H as in the first embodiment, the burr 64 does not interfere with the flat plate portion 41a in the assembled state, and the fins 60, 33 and the flat plate portion 41a. The bonding state with is the best.

  When the burr 64 of the inner fin 60 protrudes from the wave amplitude range H, the amount of protrusion is preferably 0.1 mm or less. This is because in such a case, the joined state between the inner fin 60 and the tube 30 is particularly good, and the joined state between the metal plates 40 and 40 constituting the tube 30 is particularly good.

  (4) In the heat exchanger 1 of the first embodiment, the outer fin 33 has the same structure as the inner fin 60 described above. That is, the heat exchanger 1 according to the first embodiment joins the flat tubes 30, 30,... Provided in a plurality of stages and the refrigerant flowing through the tubes 30 communicating with the open ends of the tubes 30. A heat exchanger 1 having header tanks 11, 12, 21, 22 to be distributed and outer fins 33 having a corrugated cross-section sandwiched between adjacent tubes 30, 30, and outer fins 33 includes a small curved portion 63 that is recessed toward the side opposite to the side in contact with the tube 30 in the top portion 62A of the corrugated top portion 62 where the cutting portion 61 is provided.

  Therefore, the amount of the burr at the fin end generated in the manufacturing process of the outer fin 33 (the cutting process of the corrugated metal plate 60 </ b> B) decreases from the amplitude range H of the wave corresponding to the dent amount d of the curved portion 63. . Therefore, the amount of interference between the burr 64 and the flat plate portion 41a at the outer fin end portion 61 is reduced, and the bonding state between the outer fin 33 and the flat plate portion 41a is improved.

  (5) In the manufacturing method of the fins 60 and 33 of the first embodiment, the flat metal plate 60A is formed into the corrugated metal plate 60B, and the amplitude direction is applied to at least one of the corrugated top portions 62A. A small curved portion 63 that is recessed toward the inside of Z is formed, and the top 62 of the corrugated portion 62 is cut by a top portion 62 </ b> A that includes the small curved portion 63.

  Therefore, the amount of the burr 64 generated in the manufacturing process of the fins 60 and 33 (the cutting process of the corrugated metal plate 60 </ b> B) decreases from the wave amplitude range H corresponding to the dent amount d of the curved portion 63. Therefore, when the manufactured fins 60 and 33 are sandwiched between the opposing flat plate portions 41a, the amount of interference between the burrs 64 and the flat plate portions 41a of the fin end portions 61 is reduced, and the fins 60 and 33 and the flat plate portions 41a are joined. The state becomes good.

  (6) In addition, in the manufacturing method of the fins 60 and 33 of the first embodiment, the small curved portion 63 is formed while the flat metal plate 60A is formed in the cross-sectional wave shape by the pair of opposed forming gears 51 and 51. To form.

  Therefore, two processes can be combined into one process. That is, the step (A) of making the flat metal plate 60A into a corrugated metal plate and the step (B) of forming the small curved portion 63 on the corrugated metal plate 60B can be combined. Thereby, manufacturing cost can be reduced. In the present invention, the step (A) and the step (B) may be performed separately.

  Hereinafter, other embodiments of the present invention will be described. In the following embodiments, the same or similar components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

“Second Embodiment”
FIG. 12 shows the fin of the second embodiment. In the fins 60 and 33 of the first embodiment, the small curved portion 63 is formed in the top portion 62A to be cut, but in the fin 70 of the second embodiment, the small curved portions 63 of all the top portions 62 are formed. . Therefore, according to the second embodiment, the same effect as the first embodiment can be obtained. Moreover, according to this 2nd Embodiment, since the small curved part 63 is formed in all the top parts 62, you may cut | disconnect in any top part 62. FIG. Therefore, there is an advantage that the width W of the fin can be easily changed. In addition, since the manufacturing method of the fin of 2nd Embodiment is similar to 1st Embodiment, description is abbreviate | omitted.

"Variation of cutting method"
In addition, the cutting method of a corrugated metal plate is not limited to the above-mentioned embodiment, You may employ | adopt the following other cutting methods and other cutting methods.

  FIG. 8 shows a first modification of the cutting method. In the cutting method shown in FIG. 8, the clamps 81a and 81b sandwiching the corrugated metal plate 60B from above and below and the movable dies 82a and 82b are alternately arranged, and the corrugated metal plate 60B is cut by the blade 83 at the end of the movable die 82a. How to cut.

  According to this cutting method, the cutting is performed in a state where the entire corrugated metal plate 60B is fixed, so that there is an advantage that the cutting position is hardly displaced and the cutting accuracy and dimensional accuracy are improved.

  FIG. 9 shows a second modification of the cutting method. The cutting method shown in FIG. 9 is a method in which the corrugated metal plate 60B is cut by the blade portion 86 with the blade portion protruding from one of the clamps 85a while the corrugated metal plate 60B is sandwiched between the clamps 85a and 85b. The other clamp 85b is provided with a hole 87 that can accommodate the blade 86.

  According to this cutting method, the cutting is performed in a state where the entire corrugated metal plate 60B is fixed, so that there is an advantage that the cutting position is hardly displaced and the cutting accuracy and dimensional accuracy are improved.

  FIG. 10 shows a third modification of the cutting method. The cutting method shown in FIG. 10 is a burless method in which the corrugated metal plate 60B is cut by the blade portions 88a and 89a of the rollers 88 and 89 facing each other.

  FIG. 11 shows a fourth modification of the cutting method. The cutting method shown in FIG. 11 is a burless method in which the corrugated metal plate is cut by the blade portion 91a of one of the rollers 91 and 92 facing each other.

  The fins of this embodiment can be used for other heat exchangers other than the evaporator, and can also be used for other fields such as a heat radiating portion of a machine element.

FIG. 1 is a front view of an evaporator according to the first embodiment. FIG. 2 is a top view of the evaporator. 3A is an exploded perspective view of the tube of the evaporator, and FIG. 3B is a perspective view of the tube. 4A is a cross-sectional view showing an exploded state of the tube of the evaporator, and FIG. 4B is a cross-sectional view of the tube of the evaporator. 5 is an enlarged cross-sectional view of FIG. 4b. FIG. 6 shows a manufacturing process of fins, FIG. 6a is a diagram showing a processing step using a formed gear, and FIG. 6b is a diagram showing a corrugated metal plate made in the step of FIG. 6a. 7a and 7b show a manufacturing process of the fins and show a cutting process of cutting the corrugated metal plate of FIG. 6b. FIG. 8 is a schematic view showing a first modification of the cutting step. FIG. 9 is a schematic view showing a second modification of the cutting step. FIG. 10 is a schematic view showing a third modification of the cutting step. FIG. 11 is a schematic view showing a fourth modification of the cutting step. FIG. 12 is a view showing a second embodiment of the fin.

Explanation of symbols

1 ... Evaporator (heat exchanger)
30 ... Tube 33 ... Outer fin (fin)
40 (40A, 40B) ... Metal plate 41a ... Flat plate portion 51 ... Molded gear 60 ... Inner fin (fin)
60A ... Flat metal plate 60B ... Corrugated metal plate 61 ... Fin end (cut)
62 ... Top portion 62A ... Top portion with cutting portion 63 ... Slightly curved portion 64 ... Burr 70 ... Fin H ... Amplitude range Z ... Amplitude direction d ... Dent amount

Claims (6)

A cross-sectionally corrugated fin (33 or 60 or 70),
Of the corrugated top portions (62, 62,...), The top portion (62A) where the cutting portion (61) is located is a small curved portion (63) recessed toward the side opposite to the side in contact with the flat plate portion (41a). A fin (33 or 60 or 70). The flat plate portions (41a, 41a,...) Provided in multiple stages to partition the flow path of the heat exchange medium and the wave-shaped fins (33 or 33) sandwiched between the flat plate portions (41a, 41a) 60 or 70), and a heat exchanger (1) comprising:
The fin (33, 60, or 70) is opposite to the side contacting the flat plate portion (41a) at the top portion (62A) of the corrugated top portion (62, 62,...) Where the cut portion (61) is located. A heat exchanger (1) comprising a small curved portion (63) recessed toward the side. Flat tubes (30, 30,...) Provided in multiple stages,
A header tank (11, 12, 21, 22) that communicates with the open end of the tube (30) and that merges and distributes the refrigerant flowing through the tube;
A corrugated inner fin (60) sandwiched between opposing flat plate portions (41a, 41a) of the tube (30) inside the tube (30);
A heat exchanger (1) comprising:
The inner fin (60) has a corrugated top (62, 62, ...) on the top (62A) where the cut portion (61) is located, on the side opposite to the side in contact with the flat plate (41A). A heat exchanger (1) comprising a small curved portion (63) recessed toward the heat exchanger (1). Flat tubes (30, 30,...) Provided in multiple stages,
A header tank (11, 12, 21, 22) that communicates with the open end of the tube (30) and that merges and distributes the refrigerant flowing through the tube;
A corrugated outer fin (33) sandwiched between adjacent tubes (30, 30);
A heat exchanger (1) comprising:
The outer fin (33) is directed to the top (62A) of the corrugated top (62, 62,...) Where the cut portion (61) is located, on the side opposite to the side in contact with the tube (30). A heat exchanger (1) comprising a small curved portion (63) that is recessed. A method of manufacturing a fin (33 or 60 or 70),
A flat metal plate (60A) is formed into a wave shape (60B) as a whole,
A small curved portion (63) that is recessed toward the inside in the amplitude direction (Z) is formed on at least one top portion (62A) of the top portions (62, 62, ...) of the corrugations,
A method of manufacturing a fin (33, 60, or 70), characterized by cutting at a top (62A) having a small curved portion (63) among the tops (62, 62, ...) having a cross-sectional wave shape. A method for manufacturing a fin (33 or 60 or 70) according to claim 5,
At least one top portion (62A) of the corrugated top portions (62, 62,...) While the plate-shaped metal plate (60A) is formed into a wave shape as a whole by a pair of opposed formed gears (51, 51). ) Is formed with a small curved portion (63) recessed inward in the amplitude direction (Z). A method for manufacturing a fin (33, 60, or 70).

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