JP2013238379A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger into which heat dissipation fins of other heat exchanges are not included between laminates of the heat dissipation fins of adjoining heat exchangers in a step where a plurality of heat exchangers having heat transfer pipe not yet fixed are arranged, through the heat transfer pipes, on a heat dissipation layer where the plurality of heat dissipation fins are layered, and the heat transfer pipes are sequentially expanded and fixed.SOLUTION: There is a heat exchanger including a heat dissipation fin 1 having a first protrusion 11a that protrudes in a laminating direction of the heat dissipation fin 1 at one edge in a longitudinal direction of the heat dissipation fin 1, and a second protrusion 11b that protrudes in an opposite direction to the first protrusion 11a at the other edge in a symmetric position to the first protrusion 11a with respect to a center line parallel to in a longitudinal direction of the heat dissipation fin.

Description

  The present invention relates to a fin tube type heat exchanger.

  Conventionally, when connecting heat radiating fins and heat transfer tubes in the manufacturing process of finned tube heat exchangers used in air conditioners, etc., heat transfer tubes are inserted into the laminated heat radiating fins and protrude from the heat radiating fins. A method is adopted in which an expansion billet is press-fitted into the interior of the housing, and the heat transfer tube is expanded to fix the heat radiation fin and the heat transfer tube.

JP 2000-301271 A

When a heat exchanger is manufactured, productivity is usually increased by collectively manufacturing a plurality of heat exchangers.
For this purpose, a heat transfer tube is inserted into a heat radiation fin laminate in which heat radiation fins are laminated in advance, a plurality of heat exchangers before fixing the heat radiation fins are arranged so that their longitudinal directions are in contact, and the periphery is covered with a restraining member such as a sheet metal. And temporarily fix.
And a pipe expansion billet is inserted into the heat transfer pipe one by one, the pipe is expanded while being plastically deformed by pushing the heat transfer pipe from the inside, and the heat transfer pipes and the radiation fins of the plurality of heat exchangers are sequentially tightly fixed.

At this time, since the material of the radiating fin is softer than the material of the heat transfer tube, the radiating fin is deformed or warped, and the radiating fin of another adjacent heat exchanger is inserted in the gap between the stacked radiating fins. There was a problem of entering and meshing.
In addition, when this engagement occurs partially, there is a problem that the heat exchanger itself is warped or bent.

  This invention was made to solve such problems, and by devising the shape of the radiating fin, in the tube expansion process which is one of the manufacturing processes of the heat exchanger, It is an object of the present invention to provide a heat exchanger that can suppress the radiation fins of other heat exchangers that are sequentially manufactured adjacent to each other and suppress the damage to the heat radiation fins, the bending of the heat exchanger, and the warpage.

The heat exchanger according to the present invention is:
In a heat exchanger in which a plurality of thin plate-like radiating fins are laminated, a heat transfer tube through which a refrigerant passes is inserted into a through hole of the radiating fin laminate,
From one surface of the heat radiating fin, a cylindrical fin collar that surrounds the periphery of the heat transfer tube inserted through the heat radiating fin and regulates the interval between adjacent heat radiating fins protrudes in the stacking direction of the heat radiating fin stack,
One edge of the radiating fin in the longitudinal direction has a first protrusion protruding in the stacking direction of the radiating fin, and the other of the positions symmetrical to the first protrusion with respect to a center line parallel to the longitudinal direction of the radiating fin The heat radiation fin which has the 2nd convex part which protrudes in the edge in the direction opposite to a 1st convex part is provided.

The heat exchanger according to the present invention is
In a heat exchanger in which a plurality of thin plate-like radiating fins are laminated, a heat transfer tube through which a refrigerant passes is inserted into the through hole of the radiating fin laminate,
From one surface of the heat radiating fin, a cylindrical fin collar that surrounds the periphery of the heat transfer tube inserted through the heat radiating fin and regulates the interval between adjacent heat radiating fins protrudes in the stacking direction of the heat radiating fin stack,
One edge in the longitudinal direction of the radiating fin has a first convex part protruding in the stacking direction of the radiating fin, and the other edge at a position symmetrical to the first convex part with respect to the central axis in the longitudinal direction of the radiating fin In addition, a heat radiation fin having a second convex portion protruding in the same direction as the first convex portion is provided.

The heat exchanger according to the present invention is:
From one surface of the heat radiating fin, a cylindrical fin collar that surrounds the periphery of the heat transfer tube inserted through the heat radiating fin and regulates the interval between adjacent heat radiating fins protrudes in the stacking direction of the heat radiating fin stack,
One edge of the radiating fin in the longitudinal direction has a first protrusion protruding in the stacking direction of the radiating fin, and the other of the positions symmetrical to the first protrusion with respect to a center line parallel to the longitudinal direction of the radiating fin And a radiating fin having a second convex portion projecting in the opposite direction to the first convex portion,
The heat exchanger according to the present invention is
From one surface of the heat radiating fin, a cylindrical fin collar that surrounds the periphery of the heat transfer tube inserted through the heat radiating fin and regulates the interval between adjacent heat radiating fins protrudes in the stacking direction of the heat radiating fin stack,
One edge in the longitudinal direction of the radiating fin has a first convex part protruding in the stacking direction of the radiating fin, and the other edge at a position symmetrical to the first convex part with respect to the central axis in the longitudinal direction of the radiating fin In addition, it is provided with a radiation fin having a second convex portion protruding in the same direction as the first convex portion,
Even if a plurality of unfixed heat exchangers before completion are bundled and restrained, the radiating fins 1 of the adjacent unfixed heat exchanger do not enter between the stacks of the radiating fins 1 of the adjacent unfixed heat exchanger. .
In addition, by inserting the expansion billet in the tube expansion process, even if the outer diameter of the heat transfer tube changes and the heat dissipation fin 1 is slightly distorted, the heat dissipation fin enters between the stacks of the heat dissipation fins of the adjacent unfixed heat exchanger. Nor.
As a result, a heat exchanger free from bending and warping can be manufactured.

It is a perspective view of the heat exchanger which concerns on Embodiment 1 of this invention. It is the figure which looked at the heat exchanger which concerns on Embodiment 1 of this invention from the lamination direction. It is a perspective view of the radiation fin which concerns on Embodiment 1 of this invention. It is a figure which shows the state which puts the non-fixed heat exchanger which concerns on Embodiment 1 of this invention into the restraint member, and has fixed the outer periphery. It is a conceptual diagram of the pipe expansion apparatus which concerns on Embodiment 1 of this invention. FIG. 4 is a diagram in which a part of the cross section taken along line AA is rotated 90 degrees to the right. It is a perspective view of the radiation fin which concerns on Embodiment 1 of this invention. It is sectional drawing of the aligned unfixed heat exchanger which concerns on Embodiment 2 of this invention. It is a perspective view of the radiation fin which concerns on Embodiment 3 of this invention. It is principal part sectional drawing of the non-fixed heat exchanger which concerns on Embodiment 3 of this invention. It is sectional drawing of the aligned unfixed heat exchanger which concerns on Embodiment 4 of this invention. It is a perspective view of the radiation fin which concerns on Embodiment 5 of this invention. It is a side view which shows the overlap condition of the radiation fin of both unfixed heat exchangers when two unfixed heat exchangers concerning Embodiment 5 of this invention are arranged. It is a perspective view of the radiation fin which concerns on Embodiment 6 of this invention. It is a side view which shows the overlap condition of the radiation fin of both unfixed heat exchangers when two unfixed heat exchangers concerning Embodiment 6 of this invention are arranged.

Embodiment 1 FIG.
Hereinafter, the heat exchanger according to Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the heat exchanger 100.
FIG. 2 is a view of the heat exchanger 100 as viewed from the stacking direction.
The heat exchanger 100 is configured by press-fitting a heat transfer tube 2 through which a refrigerant passes through a heat radiation fin laminate in which a plurality of heat radiation fins 1 are laminated.
The heat exchanger 100 is mainly used for air conditioning equipment such as an air conditioner.

FIG. 3 is a perspective view of the radiation fin 1.
The radiating fin 1 is formed by punching a thin plate such as aluminum with a press.
Fin collars 12 arranged at equal intervals are provided in the center of the fin.
The inside of the fin collar 12 is a hollow cylindrical penetrating hole.
The fin collar 12 is provided in order to ensure the space | interval of this radiation fin 1 and the adjacent radiation fin 1 laminated | stacked on this.
The fin collar 12 hits the bottom surface of the heat radiating fin 1 stacked on the heat radiating fin 1 around the heat transfer tube 2 to secure a gap between the stacked layers.

At one edge in the longitudinal direction of the radiating fin 1, a first protrusion 11 a protrudes in the stacking direction of the radiating fin stack.
The 1st convex part 11a has the shape which divided the spherical surface into 4 equal parts, and is extruded and shape | molded with the press machine.
On the other edge of the radiating fin 1, at a position symmetrical to the first bulging portion 11 a with respect to the center line parallel to the longitudinal direction of the radiating fin 1, the second bulging portion 11 b has the first bulging portion. It protrudes in the direction opposite to the portion 11a.
The shape of the 2nd convex part 11b is the same shape as the 1st convex part 11a.
The role of the 1st convex part 11a and the 2nd convex part 11b is mentioned later.

Next, a method for fixing the radiating fins 1 and the heat transfer tubes 2 of the heat exchanger 100 will be described.
First, a large number of heat dissipating fins 1 are laminated at the same position to form a heat dissipating fin laminate.
Next, the heat transfer tube 2 is inserted into the hole of the fin collar 12 to constitute an unfixed heat exchanger.
In this state, each radiating fin 1 is not yet fixed to the heat transfer tube 2.
FIG. 4 is a view showing a state in which a plurality of unfixed heat exchangers 20 are put in the restraining member 51 and the outer periphery is fixed.
In the manufacturing process of the heat exchanger 100, a plurality of unfixed heat exchangers 20 are bundled, a tube expansion jig is inserted into one heat transfer tube at a time, and the radiating fins 1 are fixed to the heat transfer tubes 2. Repeat this for multiple units.

FIG. 5 is a conceptual diagram of the tube expansion device 50.
The tube expansion device 50 includes a plurality of elongated rod-shaped mandrels 21, a press-fitting plate 24 that holds the mandrel 21 at its upper end and is linearly movable in the vertical direction, and a pressure drive that drives the press-fitting plate 24 in the vertical direction. A pressure cylinder 23 as a source, an intermediate plate 25 that prevents buckling of the mandrel 21, and a substantially spherical tube expansion billet 22 that is a tube expansion member provided at the lower end of the mandrel 21, respectively. A plurality of unfixed heat exchangers 20 that are workpieces are arranged below the pipe expansion device 50.
Although the four sides of the unfixed heat exchanger 20 are actually covered with the restraining member 51 as shown in FIG. 4, they are not shown in FIG.

The expansion billet 22 is press-fitted from the tip opening at the top of the heat transfer tube 2 and expanded while being plastically deformed by expanding the heat transfer tube 2 from the inside, and the heat transfer tube 2 and the radiation fins 1 are moved downward from the upper stack. Sequentially fixed to the laminate.
In this manner, the heat dissipating fins 1 and the heat transfer tubes 2 on which one unfixed heat exchanger 20 is stacked are fixed, and a plurality of heat exchangers 100 are sequentially manufactured.
The unfixed heat exchanger 20 receives a compressive load as a whole by the insertion force of the expanded billet 22 during the expansion.
When a compression load is applied to the unfixed heat exchanger 20 due to the insertion force of the pipe expansion billet 22, the heat exchanger 100 after being bent may bend and warp.
In order to prevent this bending and warping, the first protrusion 11 a and the second protrusion 11 b are provided on the edge in the longitudinal direction of the radiating fin 1.

FIG. 6 is a diagram in which a part of the cross section taken along line AA in FIG. 4 is rotated 90 degrees to the right.
The heights of the first protrusion 11a and the second protrusion 11b from the surface of the main body of the radiating fin 1 are h1 and h2, respectively, and when the stacking interval between the adjacent radiating fins 1 is d, h1 and h2 H1 and h2 are set so that the sum is greater than d.
Usually, it may be larger than ½ of d.

  According to the heat exchanger 100 according to Embodiment 1 of the present invention, even if a plurality of unfixed heat exchangers 20 before completion are bundled and restrained, the radiating fins 1 of the adjacent unfixed heat exchangers 20 are It does not enter between the stacks of the radiating fins 1 of the adjacent unfixed heat exchanger 20.

In addition, even if the outer diameter of the heat transfer tube changes and the heat dissipating fin 1 is somewhat distorted by press-fitting the tube expanding billet 22 in the tube expanding step, the heat dissipating fin is interposed between the heat dissipating fins 1 of the adjacent unfixed heat exchanger 20. No one gets in.
As a result, a heat exchanger free from bending and warping can be manufactured.

  In addition, although the shape of the 1st convex part 11a and the 2nd convex part 11b was shown in the shape of a part of substantially spherical shape, it may be arch shape as shown in FIG.

Embodiment 2. FIG.
Hereinafter, the heat exchanger according to the second embodiment of the present invention will be described with reference to the drawings, focusing on parts different from the first embodiment.
FIG. 8 is a cross-sectional view of aligned unfixed heat exchangers 220 according to the present embodiment.
In FIG. 8, two unfixed heat exchangers 220 are arranged.
Differences from FIG. 6 of the first embodiment will be described.
The shape of the radiation fin 201 is substantially the same as that of the radiation fin 1, but the size (height) of the first protrusion 211a and the second protrusion 211b is different.
The heat radiating fin 201 includes first convex portions 211a and 211b that are lower in height than the first convex portion 11a and the second convex portion 11b of the first embodiment.
The plurality of radiating fins 201 are alternately stacked one by one, rotated through 180 degrees about a line that passes through the center of the radiating fin 201 and is parallel to the stacking direction of the radiating fins 201, and is stacked. Different from Form 1.

In addition, since the heat radiation fin 201 is rotated and stacked, the first convex portion 211a and the second convex portion 211b have the positional relationship described in the first embodiment, and a plurality of first convex portions 211a. Need to exist symmetrically with respect to the center line parallel to the short direction of the radiating fin 201.
Similarly, the positional relationship between the plurality of second convex portions 211b needs to exist in a symmetric positional relationship with respect to the center line parallel to the short direction of the radiating fin 201.

The heights h <b> 1 and h <b> 2 of the first convex portion 211 a and the second convex portion 211 b are greater than よ り and smaller than ½ of the stacking gap d of the radiating fin 201.
With such a configuration, when a plurality of unfixed heat exchangers 220 are bundled and restrained in the tube expansion process, at least two of the heat dissipating fins 201 stacked one above the other are adjacent unfixed heat exchanges. It is always in contact with the end portion of the heat dissipating fin 201 of the heat exchanger 220 and does not enter between the stacked heat dissipating fins 201 of the adjacent unfixed heat exchanger 220.

According to the heat exchanger according to the present embodiment, the same effects as those described in the first embodiment can be obtained.
Moreover, the heat radiation fin 201 is generally as thin as about 0.1 mm.
Therefore, when it shape | molds by extruding with a press, the said part of a radiation fin becomes thin, so that the height of the 1st convex part 211a and the 2nd convex part 211b is made high.
If the heat dissipation fins are alternately inverted and stacked as in this configuration, the height of the convex portions 211a and 211b may be larger than 1/3 of the stacking interval of the heat dissipation fins 201. Yield can be improved.

Embodiment 3 FIG.
Hereinafter, the heat exchanger according to the third embodiment of the present invention will be described with a focus on differences from the first embodiment with reference to FIGS. 9 and 10.
FIG. 9 is a perspective view of the heat dissipating fins 301 constituting the heat exchanger according to the present embodiment.
In the first embodiment, the projecting directions of the first convex portion 11a and the second convex portion 11b are reversed, but in the present embodiment, the projecting directions of the first convex portion 311a and the second convex portion 311b are the same. .
FIG. 10 is a cross-sectional view of a main part of the unfixed heat exchanger 320.
As in the first embodiment, when the heights of the first convex portion 311a and the second convex portion 311b are h1 and h2, respectively, and the stacking interval between adjacent radiating fins 301 is d, the sum of h1 and h2 H1 and h2 are set so that becomes larger than d.
Usually, it should be larger than ½ of d.
According to the heat exchanger which concerns on this Embodiment, there exists an effect similar to Embodiment 1. FIG.

Embodiment 4 FIG.
Hereinafter, the heat exchanger according to the fourth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the third embodiment.
FIG. 11 is a cross-sectional view of aligned unfixed heat exchangers 420 according to the present embodiment.
In FIG. 11, two unfixed heat exchangers 420 are arranged.
The difference between the third embodiment and the unfixed heat exchanger 320 in FIG. 10 will be described.
The shape of the first radiation fin 401 itself is substantially the same as that of the radiation fin 301 of the third embodiment.
However, the magnitude | size (height) of the 1st convex part 411a and the 2nd convex part 411b differs.
Further, the unfixed heat exchanger 420 is provided with second radiating fins 405 in which the protruding directions of all the convex portions are opposite to the first radiating fins 401.
And the 1st radiation fin 401 and the 2nd radiation fin 405 are laminated alternately.

  In the present embodiment, all the heights of the first convex portion 411a, the second convex portion 411b, and the first convex portion 415a and the second convex portion 415b of the second heat radiating fin 405 are set to the first height 411a. The distance between the heat radiation fin 401 and the second heat radiation fin 405 is set to be larger than 1/3 and smaller than 1/2.

  According to the heat exchanger according to the fourth embodiment of the present invention, by using a configuration using two types of heat radiation fins 401 and 405, when a plurality of unfixed heat exchangers 420 are bundled and restrained in the tube expansion process. At least two of the first radiating fins 401 and the second radiating fins 405 that are stacked one above the other are necessarily attached to the end of the first radiating fin 401 or the second radiating fin 405 of the adjacent unfixed heat exchanger 420. They are in contact with each other and do not enter between the stacks of the first heat radiation fins 401 and the second heat radiation fins 405 of the adjacent unfixed heat exchanger 420.

Embodiment 5 FIG.
Hereinafter, the heat exchanger according to the fifth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
As described above, some radiating fins are as thin as about 0.1 mm.
Therefore, depending on the size of the stacking interval of the radiating fins, if the convex portion is press-molded, there may be a case where a hole is formed and it cannot be handled.
Therefore, in this embodiment, a U-shaped convex portion is used.

FIG. 12A is a perspective view of the radiating fin 501 according to the present embodiment.
A first protrusion 511a protrudes from one edge of the heat radiation fin 501 in the longitudinal direction.
On the other edge of the radiating fin 501, the second convex portion 511b is located at a position symmetrical to the first convex portion 511a with respect to the center line parallel to the longitudinal direction of the radiating fin 501. It protrudes in the direction opposite to the portion 511a.

The first convex portion 511a and the second convex portion 511b are formed by making cuts in the lateral direction and the longitudinal direction at the edges on both sides of the radiating fin 501 and raising the cut portions from the plate surface (referred to as cutting). Forming part.
The angle formed by the first convex portion 511a and the plate surface of the radiating fin 501 is bent into a square shape of 90 degrees or less, and the angle formed by the second convex portion 511b and the radiating fin 501 is inverted 90 degrees or less. Bent into shape.

FIG. 13 shows the overlapping state of the first convex portion 511a and the second convex portion 511b of the radiation fins 501 of both unfixed heat exchangers when two unfixed heat exchangers according to the present embodiment are arranged. FIG.
The second convex portion 511b on the back side of the front unfixed heat exchanger is indicated by a solid line, and the first convex portion 511a on the front side of the back non-fixed heat exchanger is indicated by a broken line.
Similarly to the first embodiment, the sum of the heights of the first convex portion 511a and the second convex portion 511b is set to be larger than the stacking interval of the radiation fins 501.
Thereby, since the 1st convex part 511a and the 2nd convex part 511b interfere with the flat part of the 2nd convex part 511b of the other party, the 1st convex part 511a, or the radiation fin 501, respectively, between the lamination | stacking of the radiation fin 501. Never get into each other.

  Further, the heat exchanger configured by stacking the heat radiation fins 501 according to the present embodiment is restrained from being deformed even when subjected to a compressive load due to the insertion force of the tube expansion billet 22, so that it bends and warps. Can be suppressed.

In addition, since the method of forming the protrusions is not a method in which the fin material is stretched, the size of the first protrusions 511a and the second protrusions 511b is not limited, and is 1/2 or more of the stacking interval d of the radiating fins 501. Can have a height of
Furthermore, since the material of the convex portion is not thinned by press molding, the strength of the first convex portion 511a and the second convex portion 511b can be sufficiently ensured.

FIG.12 (b) is a perspective view of the radiation fin 5012 which concerns on this Embodiment.
The difference between FIG. 12A and FIG. 12B is that in FIG. 12A, all the convex portions formed on the same edge have the same shape, whereas in FIG. Each convex portion is cut and raised so as to be symmetric with respect to a center line parallel to the short direction of 5012.
As shown in the second embodiment, the radiating fins 5012 are used to alternately stack the radiating fins 5012 by rotating them 180 degrees about a line passing through the center and parallel to the stacking direction.
By adopting such a configuration for the radiating fin 5012, the convex portions 511a and 511b of the radiating fin 5012 interfere with each other between the adjacent unfixed heat exchangers.
In this case, the sum of the heights of the first protrusions 511a and the second protrusions 511b is set to be larger than 1/3 and smaller than 1/2 of the stacking interval of the radiation fins 501.

Embodiment 6 FIG.
Hereinafter, the heat exchanger according to the sixth embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 14 is a perspective view of the radiating fin 601 according to the present embodiment.
The radiating fin 601 is provided with a first convex portion 611a and a second convex portion 611b that protrude in the same direction by cutting and raising processing.
FIG. 15 shows the overlapping state of the first convex portion 611a and the second convex portion 611b of the radiation fins 601 of both unfixed heat exchangers when two unfixed heat exchangers according to the present embodiment are arranged. FIG.
The second convex part 611b on the back side of the unfixed heat exchanger in front is indicated by a solid line, and the first convex part 611a on the front side of the non-fixed heat exchanger in the back is indicated by a broken line.
As in the third embodiment, the sum of the heights of the first protrusions 611 a and the second protrusions 611 b is set to be larger than the stacking interval of the heat radiation fins 601.
As a result, the first convex portion 611a and the second convex portion 611b interfere with the mating second convex portion 611b, the first convex portion 611a, or the flat surface portion of the radiating fin 601, respectively. Never get into each other.
Further, even when a compressive load is received by the insertion force of the tube expansion billet 22, since deformation is restrained, bending and warpage occurring in the heat exchanger can be suppressed.

As shown in the fourth embodiment, the first heat radiating fin 601 used in the present embodiment and the second heat radiating fin in which the first convex portion and the second convex portion protrude in opposite directions are used. The radiation fins and the second radiation fins may be alternately stacked.
In this case, the same effects as in the fourth embodiment can be obtained, and the size of each projection can be reduced, so that the strength of each projection can be ensured.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

100 heat exchanger,
1,201,301,401,405,501,5012 radiating fins,
11a, 11b, 211a, 211b, 311a, 311b, 411a, 411b, 415a, 415b, 511a, 511b
12 fin collar, 2 heat transfer tube, 20, 220, 320, 420 unfixed heat exchanger,
21 Mandrel, 22 Expanded billet, 23 Pressure cylinder, 24 Press-in plate,
25 intermediate plate, 50 tube expansion device, 51 restraining member.

Claims (9)

In a heat exchanger in which a plurality of thin plate-like radiating fins are laminated, a heat transfer tube through which a refrigerant passes is inserted into the through hole of the radiating fin laminate,
From one surface of the radiating fin, a cylindrical fin collar that surrounds the heat transfer tube inserted through the radiating fin and regulates the interval between the adjacent radiating fins is a stacking direction of the radiating fin stack Protruding into the
At one edge in the longitudinal direction of the radiation fin, there is a first projection protruding in the stacking direction of the radiation fin, and symmetrical with the first projection with respect to a center line parallel to the longitudinal direction of the radiation fin. The heat exchanger provided with the radiation fin which has the 2nd convex part which protrudes in the other edge of the said position in the opposite direction to the said 1st convex part. In a heat exchanger in which a plurality of thin plate-like radiating fins are laminated, a heat transfer tube through which a refrigerant passes is inserted into the through hole of the radiating fin laminate,
From one surface of the radiating fin, a cylindrical fin collar that surrounds the heat transfer tube inserted through the radiating fin and regulates the interval between the adjacent radiating fins is a stacking direction of the radiating fin stack Protruding into the
A first protrusion projecting in the stacking direction of the radiation fins at one edge in the longitudinal direction of the radiation fin, and a position symmetrical to the first protrusion with respect to a central axis in the longitudinal direction of the radiation fin A heat exchanger provided with a radiating fin having a second convex portion protruding in the same direction as the first convex portion on the other edge. The heat exchanger according to claim 1 or 2, wherein the plurality of radiating fins are stacked in the same direction. 4. The heat exchanger according to claim 3, wherein the height of each of the first protrusions and the second protrusions is greater than ½ of an interval between the adjacent radiation fins. The radiating fin has a plurality of the first protrusions and a plurality of the second protrusions,
The plurality of first convex portions are present at symmetrical positions with respect to a center line parallel to the short direction of the radiating fin,
The plurality of second convex portions are present at symmetrical positions with respect to a center line parallel to the short direction of the radiating fin,
2. The heat exchanger according to claim 1, wherein the plurality of heat radiating fins are alternately stacked by rotating 180 degrees about a line parallel to the stacking direction of the heat radiating fins through the center of the heat radiating fins. . In addition to the heat radiating fins, the first and second convex portions have second radiating fins provided on the surface opposite to the radiating fins,
The heat exchanger according to claim 2, wherein the radiating fins and the second radiating fins are alternately stacked. 7. The height of each of the first protrusion and the second protrusion is greater than よ り 小 さ い and less than ½ of the interval between the radiating fins adjacent vertically. Heat exchanger. The heat exchanger according to any one of claims 1 to 7, wherein the first protrusion and the second protrusion are formed by extruding a plate surface of the radiating fin. The heat exchanger according to any one of claims 1 to 7, wherein the first convex portion and the second convex portion are formed by cutting and raising a plate surface of the radiating fin.

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