JP2017120134A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of improving heat exchange efficiency by keeping a fixed interval between fins in an inner side of a curved portion.SOLUTION: A heat exchanger 5 includes a flat pipe 19 curved in L-shape in a longitudinal direction and through which a refrigerant flows, a header 20 attached to both ends of the flat pipe 19 so as to divide or combine the refrigerant, a fin 21 having a fitting portion 21a fitted with the flat pipe 19 and extending in a direction crossing the flat pipe 19, and an outer spacer 22 and an inner spacer 23 formed by cutting and raising a part of the fin 21. The inner spacer 23 has a buckling portion 23d in a center of a side surface portion of the cutting and raising.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a heat exchanger used for an air conditioner or the like.

  Conventionally, fins (heat radiating plates) of a fin tube heat exchanger have been provided with spacers formed by cutting and raising a part of the fins in order to keep the distance between the fins appropriate (for example, Patent Document 1). reference). For example, the fin 101 shown in FIG. 10 has a plurality of fitting portions 103 to be fitted with the flat tube 102, and spacers 104 at the front end portion and the rear end portion of the region where the upper and lower portions are partitioned by the fitting portion 103. I have.

  FIG. 11A shows an L shape formed in a plan view in order to house the heat exchanger 100 in the outdoor unit casing of the air conditioner. In this type of heat exchanger 100, an assembly process of assembling the flat heat exchanger 100 with a member having a brazing material applied to the surface, and the assembled flat heat exchanger 100 is brazed in a furnace. It is manufactured through a brazing step and a bending step of bending the brazed flat heat exchanger 100 into an L shape.

JP 2012-163318 A

  By the way, the spacer 104 is brazed to the adjacent fins 101, but when the flat heat exchanger 100 is bent into an L shape as shown in FIG. At the position inside the bending portion 105, in other words, at the position where the fin interval is narrowed during bending, a portion where the spacer 104 does not buckle partially occurs, and as a result, the interval between the fins 101 is constant inside the bending portion 105. However, there was a problem that the heat exchange efficiency was lowered.

  Then, this invention is made | formed in view of said problem, Comprising: It is a heat exchanger provided with the spacer formed by cutting and raising a part of fin, It is in the inside of a curved part after an L-shaped bending process. An object of the present invention is to provide a heat exchanger that can improve the heat exchange efficiency by keeping the distance between the fins constant.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a heat exchanger, wherein a flat tube through which a refrigerant flows and a fitting for fitting the flat tube A fin extending in a direction intersecting the flat tube and stacked in the length direction of the flat tube, and a gap between adjacent fins formed by cutting and raising a part of the fin is maintained. A first spacer, wherein the first spacer has a buckling portion that buckles preferentially between a tip portion and a root portion.
According to this configuration, during the bending process after brazing, the first spacer is buckled inside the curved portion, so that the fin spacing on the inside of the curved portion can be made constant and the heat exchange efficiency can be improved. .

According to a second aspect of the present invention, in the heat exchanger according to the first aspect, the buckling portion has a fin surface width that is the largest between the tip portion of the first spacer and the root portion of the first spacer. It is characterized by being formed by any one of a narrow narrow part and a thin part with the smallest plate thickness between the tip part of the first spacer and the root part of the first spacer.
According to this configuration, in the bending process after brazing, a buckling portion that reliably buckles the spacer inside the bending portion is obtained.

According to a third aspect of the present invention, in the heat exchanger according to the first or second aspect, the heat exchanger is formed by cutting and raising a part of the fin and maintaining a distance between the adjacent fins. 2 spacers, the second spacer has a notch at the tip, and the first spacer is disposed at a position outside the flat tube after L-shaped bending of the heat exchanger, The second spacer is disposed at a position inside the flat tube after the L-shaped bending of the heat exchanger.
According to this configuration, since the brazing area between the front end side of the second spacer and the adjacent fin is reduced compared to the prior art, and it is easy to come off. The leading end side of the two spacers will be disengaged from the adjacent fins. As a result, the distance between the fins outside the curved portion can be made constant, and the heat exchange efficiency can be improved.

According to a fourth aspect of the present invention, in the heat exchanger according to the third aspect, the notch is formed from at least one concave portion in the center of the leading end portion of the second spacer. .
According to this configuration, since the brazing area between the tip side of the second spacer and the adjacent fin is reduced symmetrically, the outer side of the spacer is adjacent to the tip side of the spacer when bending after brazing. Can be reliably removed from the matching fin.

  According to the present invention, the heat exchanger includes a spacer formed by cutting and raising a part of the fin, and after the L-shaped bending process, the interval between the fins of the curved portion is made constant, thereby improving the heat exchange efficiency. it can.

It is explanatory drawing which shows the structure of the air conditioner to which the heat exchanger which concerns on embodiment of this invention was applied. It is a perspective view of an outdoor unit to which a heat exchanger according to an embodiment of the present invention is applied. It is an internal perspective view of the outdoor unit to which the heat exchanger which concerns on embodiment of this invention was applied. It is a figure which shows the heat exchanger which concerns on embodiment of this invention, (a) is a top view of a heat exchanger, (b) is a front view of a heat exchanger, (c) is a side view of a heat exchanger. . It is principal part side sectional drawing of the heat exchanger which concerns on embodiment of this invention. It is a figure which shows the outer side spacer formed in the fin of the heat exchanger which concerns on embodiment of this invention, (a) is a principal part side view of the fin which shows an outer side spacer, (b) is the principal of the fin which shows an outer side spacer (C) is AA sectional drawing of an outer side spacer, (d) is a principal part front view of the fin which shows an outer side spacer. It is a figure which shows the inner side spacer formed in the fin of the heat exchanger which concerns on embodiment of this invention, (a) is a principal part side view of the fin which shows an inner side spacer, (b) is the principal of the fin which shows an inner side spacer (C) is BB sectional drawing of an inner side spacer, (d) is a principal part front view of the fin which shows an inner side spacer. It is action | operation explanatory drawing of the inner side spacer formed in the fin of the heat exchanger which concerns on embodiment of this invention, (a) is a principal part front view which shows the inner side spacer before a bending process, (b) is a bending process The principal part top view of the fin which shows the front inner spacer, (c) is the principal part front view of the fin which shows the inner spacer after a bending process, (d) is the principal part top view of the fin which shows the inner spacer after a bending process It is. It is a figure which shows the outer side spacer which concerns on a modification, (a) is a principal part side view of the fin which shows the outer side spacer which concerns on a modification, (b) is CC sectional drawing of the outer side spacer which concerns on a modification, (c) ) Is a main part front view of a fin showing an outer spacer according to a modification. It is explanatory drawing which shows the spacer formed in the fin of the heat exchanger which concerns on a prior art example. It is a figure which shows the heat exchanger which concerns on a prior art example, (a) is a top view which shows the heat exchanger before a bending process, (b) is a top view which shows the heat exchanger after a bending process.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings. Note that the same reference numerals are given to the same elements throughout the description of the embodiment.

[Air conditioner]
Drawing 1 is an explanatory view showing the composition of the air harmony machine to which the heat exchanger concerning the embodiment of the present invention was applied.
As shown in FIG. 1, the air conditioner 1 includes an indoor unit 2 and an outdoor unit 3. The indoor unit 2 is provided with an indoor heat exchanger 4, and the outdoor unit 3 is provided with a compressor 6, an expansion valve 7, a four-way valve 8 and the like in addition to the outdoor heat exchanger 5. Yes.

  During the heating operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 6 of the outdoor unit 3 flows into the heat exchanger 4 of the indoor unit 2 through the four-way valve 8. The high-pressure gas refrigerant that has exchanged heat with air in the heat exchanger 4 (condenser) is condensed and liquefied. Thereafter, the high-pressure liquid refrigerant is depressurized by passing through the expansion valve 7 of the outdoor unit 3 and becomes a low-temperature low-pressure gas-liquid two-phase refrigerant and flows into the heat exchanger 5. The refrigerant that has exchanged heat with the outside air in the heat exchanger 5 (evaporator) is gasified. Thereafter, the low-pressure gas refrigerant is sucked into the compressor 6 through the four-way valve 8.

  During the cooling operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 6 of the outdoor unit 3 flows into the heat exchanger 5 through the four-way valve 8. The high-pressure gas refrigerant that has exchanged heat with the outside air in the heat exchanger 5 (condenser) is condensed and liquefied. Thereafter, the high-pressure liquid refrigerant is decompressed by passing through the expansion valve 7 of the outdoor unit 3, becomes a low-temperature low-pressure gas-liquid two-phase refrigerant, and flows into the heat exchanger 4 of the indoor unit 2. The refrigerant that exchanges heat with air in the heat exchanger 4 (evaporator) is gasified. Thereafter, the low-pressure gas refrigerant is sucked into the compressor 6 through the four-way valve 8.

[Outdoor unit]
FIG. 2 is a perspective view of an outdoor unit to which the heat exchanger according to the embodiment of the present invention is applied.
As shown in FIG. 2, the exterior of the outdoor unit 3 includes a case 9 having a suction port (not shown) on the back surface and a blower outlet 9 a on the front surface, and a leg portion 10 provided on the lower surface portion of the case 9. And a fan guard 11 that covers the air outlet 9 a of the case 9 and a detachable cover 14 that covers the wiring connection portion 12 and the pipe connection portion 13.

FIG. 3 is an internal perspective view of an outdoor unit to which the heat exchanger according to the embodiment of the present invention is applied.
As shown in FIG. 3, the interior of the outdoor unit 3 is partitioned into a machine room 16 and a heat exchange chamber 17 by a partition plate 15. In the machine room 16, the compressor 6, an accumulator (not shown) and the like are arranged, and in the heat exchange room 17, the heat exchanger 5 and the blower fan 18 are arranged. The heat exchanger 5 is L-shaped in plan view along the back surface and one side surface of the case 9, and performs heat exchange between the air sucked from the suction port on the back surface by the blower fan 18 and the refrigerant.

  The L-type heat exchanger 5 can be obtained by bending the heat exchanger 5 formed in a flat shape. Specifically, an assembly process for assembling the flat heat exchanger 5 with a member having a brazing material applied to the surface, and a brazing process for brazing the assembled flat heat exchanger 5 in a furnace, The L-shaped heat exchanger 5 is manufactured through a bending process of bending the brazed flat heat exchanger 5 into an L-shape. First, the flat heat exchanger 5 will be described.

[Heat exchanger]
FIG. 4 is a diagram illustrating a heat exchanger according to an embodiment of the present invention, in which (a) is a top view of the heat exchanger, (b) is a front view of the heat exchanger, and (c) is a heat exchanger. It is a side view.
As shown in FIG. 4, the heat exchanger 5 includes a plurality of flat tubes 19 through which a refrigerant flows, a pair of headers 20 attached to both ends of the flat tubes 19, and a flat shape extending in a direction intersecting the flat tubes 19. And a plurality of fins 21 stacked in the length direction of the tube 19.

FIG. 5 is a side cross-sectional view of the main part of the heat exchanger according to the embodiment of the present invention.
As shown in FIG. 5, the flat tube 19 has a flat shape extending in the air flow direction indicated by an arrow, and a plurality of refrigerant channels 19 a orthogonal to the air flow direction are formed therein. .

  The flat tubes 19 are arranged in parallel in the vertical direction through a gap through which air passes, and both ends thereof are connected to a pair of headers 20. For example, in the heat exchanger 5 shown in FIG. 4B, a plurality of flat tubes 19 extending in the left-right direction are juxtaposed in a vertical direction with a predetermined gap, and both ends of the flat tubes 19 are connected to the header 20 respectively. doing.

  The header 20 has a cylindrical shape, and the refrigerant supplied to the heat exchanger 5 is branched into the plurality of flat tubes 19 or the refrigerant flowing out of the plurality of flat tubes 19 is contained therein. Merge.

  The fin 21 has a flat plate shape extending in a direction intersecting with the flat tube 19 in a front view of FIG. 5, and is laminated in parallel through a gap for air to pass in the length direction of the flat tube 19. Are arranged. For example, in the heat exchanger 5 shown in FIG. 4B, a plurality of fins 21 along the vertical direction are arranged in parallel via a predetermined gap in the horizontal direction.

  As shown in FIG. 5, the fin 21 is formed with a plurality of fitting portions 21 a to be fitted to the flat tubes 19, and the fitting portions 21 a are fitted in the flat tubes 19 in the state where the fins 21 are fitted. By attaching, the fin 21 and the flat tube 19 are integrally joined. In addition, although the fitting part 21a of this embodiment is a notch groove shape which the windward side opened, a punching hole shape may be sufficient.

[Spacer]
Next, the spacers 22 and 23 of the fins 21 which are the main parts of the present invention will be described with reference to FIGS.

FIG. 6 is a view showing the outer spacer 22 (second spacer) formed on the fin of the heat exchanger according to the embodiment of the present invention, and (a) is a side view of the main part of the fin showing the outer spacer 22; 7B is a perspective view of the main part of the fin showing the outer spacer 22, FIG. 7C is a cross-sectional view taken along the line AA of the outer spacer 22, and FIG. These are figures which show the inner side spacer 23 (1st spacer) formed in the fin of the heat exchanger which concerns on embodiment of this invention, (a) is a principal part side view of the fin which shows the inner side spacer 23, (b) ) Is a perspective view of the main part of the fin showing the inner spacer 23, (c) is a cross-sectional view taken along the line BB of the inner spacer 23, and (d) is a front view of the main part of the fin showing the inner spacer 23.
As shown in FIG. 5 to FIG. 7, the fin 21 is formed by cutting and raising a part of the fin 21 in order to properly maintain an interval between adjacent fins 21 (for example, 1 mm to several mm). Kinds of spacers 22 and 23 are provided.

  The outer spacer 22 is provided at a position on the outside of the curved portion when the flat heat exchanger 5 is bent into an L shape, in other words, at a position where the fin interval is widened during bending. The outer spacer 22 is provided on the front end side (windward side) of the region where the upper and lower sides are partitioned by the fitting portion 21a.

  The inner spacer 23 is provided at a position inside the curved portion when the flat heat exchanger 5 is bent into an L shape, in other words, at a position where the fin interval is narrowed at the time of bending. An inner spacer 23 is provided on the rear end side (leeward side) of the region where the upper and lower sides are partitioned by the fitting portion 21a. Note that the position and number of the spacers 22 and 23 can be changed as appropriate.

  The spacers 22 and 23 have their tip surfaces in contact with the surfaces of the adjacent fins 21, so that the spacing between the fins 21 can be properly maintained. On the other hand, when the spacers 22 and 23 are fitted in the cut-and-raised holes 24 and 25 of the adjacent fins 21, not only can the gap between the fins 21 be maintained properly, but also the subsequent correction takes time, so It is required to prevent the spacers 22 and 23 from fitting into the raising holes 24 and 25.

  As shown in FIGS. 6 and 7, the spacers 22 and 23 of the present embodiment include the first side 22a and 23a (width dimensions W1 and W3) on the base side and the second side 22b and 23b (width dimension on the tip side). W2 and W4) and opposite side edges 22c and 23c connecting the end points of the first sides 22a and 23a and the end points of the second sides 22b and 23b, the second side rather than the first side 22a and 23a. By making 22b and 23b long, the fitting to the cut-and-raised holes 24 and 25 of the adjacent fins 21 is suppressed. Hereinafter, the difference between the outer spacer 22 and the inner spacer 23 will be described in detail.

[Outer spacer 22]
As shown in FIG. 6, the outer spacer 22 includes a first side 22a (width dimension W1) on the base side, a second side 22b (width dimension W2) longer than the first side 22b on the tip side, and a first side. 22a and the end 22c of the second side 22b, which are opposed to each other in a straight line, are basically trapezoidal, but at the tip of the outer spacer 22 (second side 22b). Has a notch 22d.

  The notch 22 d is for reducing the contact area with the adjacent fins 21 on the second side 22 b of the outer spacer 22. That is, according to such a notch 22d, the brazing area with respect to the adjacent fins 21 of the outer spacer 22 provided at the position outside the curved portion at the time of bending after brazing the heat exchanger 5 is increased. Since it is reduced and the peeling load (tensile load) of brazing is reduced and it is easy to come off, the second side 22b of the outer spacer 22 provided at a position outside the bending portion 105 is adjacent to the fin 21 at the time of bending. As a result, the interval between the fins 21 outside the curved portion can be made constant.

  The notch 22d provided in the outer spacer 22 of the present embodiment is formed from one recess (for example, an inverted trapezoidal recess) at the center of the second side 22b. According to such a notch 22d, the brazing area between the front end portion (second side 22b) of the outer spacer 22 and the adjacent fin 21 is the height of the outer spacer 22 passing through the center of the front end portion (second side 22b). Reduction is performed symmetrically with respect to a straight line M parallel to the vertical direction. As a result, at the time of bending after brazing, it is possible to reliably remove the distal end side of the outer spacer 22 from the adjacent fins 21 outside the curved portion 105.

[Inner spacer 23]
As shown in FIG. 7, the inner spacer 23 includes a first side 23a (width dimension W3) on the base side and a second side 23b (width dimension W4) longer than the first side 23b on the tip side. However, the outer spacer 22 is different from the outer spacer 22 in that it has a buckling portion 23d that is buckled by an external force between the first side 23a (base portion) and the second side 23b (tip portion).

FIG. 8 is an operation explanatory view of the inner spacer formed on the fin of the heat exchanger according to the embodiment of the present invention before and after bending of the heat exchanger, and (a) is a fin showing the inner spacer before bending. (B) is a plan view of the main part of the fin showing the inner spacer before bending, (c) is a front view of the main part of the fin showing the inner spacer after bending, and (d) is a bending process. It is a principal part top view of the fin which shows a back inner spacer.
As shown in FIG. 8, the buckling portion 23 d buckles between the first side 23 a and the second side 23 b when a buckling load is applied to the inner spacer 23. That is, according to such a buckling portion 23d, a position that is inside the bending portion 105, as shown in FIGS. 8C and 8D, when bending after the heat exchanger 5 is brazed. The inner spacer 23 provided on the inner side of the curved portion 105 is buckled without detaching from the adjacent fins 21. As a result, the interval between the fins 21 inside the curved portion 105 can be made constant.

  As shown in FIGS. 7 and 8, the buckling portion 23d provided in the inner spacer 23 of the present embodiment is narrowed down more narrowly than the first side 23a and the second side 23b, and the inner spacer 23 has the narrowest width. It is formed by a narrow part (part of width dimension W5). More specifically, the side 23c of the inner spacer 23 includes a first side 23e that rises perpendicularly from the cut-and-raised end of the first side 23a, and a second that bends inward from the tip of the first side 23e at a right angle. A side edge 23f, a third side edge 23g extending from the inner end of the second side edge 23f toward the outer side and reaching the end point of the second side 23b. A narrow width portion (a portion having a width dimension W5) to be a buckling portion 23d is formed between 23f and the third side edge 23g. According to such a buckling portion 23d, the inner spacer 23 provided at a position on the inner side of the bending portion is buckled along the virtual buckling line L when bending after the heat exchanger 5 is brazed. It becomes possible to make it.

  Note that the buckling portion 23d of the present embodiment is formed by a narrow portion that is narrower than the first side 23a and the second side 23b and has the narrowest width of the inner spacer 23. A buckling portion is formed by a thin portion formed by thinning the plate thickness along the virtual buckling line L instead of the narrow width portion having the narrowest spacer surface along the virtual buckling line L perpendicular to the height direction. Also good. Specifically, a hole or a thin portion is provided on the surface of the spacer along the virtual buckling line, or a groove (V cut or the like) is provided on the side 23c along the virtual buckling line L. Also good.

  According to the embodiment of the present invention described above, the heat exchanger 5 includes the flat tube 19 through which the refrigerant flows, and the fitting portion 21a into which the flat tube 19 is fitted, and intersects the flat tube 19. An outer spacer 22 and an inner spacer 23 that extend in the direction and are stacked in the length direction of the flat tube 19 and an interval between the adjacent fins 21 that are formed by cutting and raising a part of the fin 21. Since the notch 22d is provided at the tip of the outer spacer 22, the brazing area between the tip of the outer spacer 22 and the adjacent fin 21 is reduced as compared with the conventional case. Therefore, at the time of bending after brazing, the front end side of the outer spacer 22 is disengaged from the adjacent fins 21 on the outside of the curved portion 105, and as a result, the interval between the fins 21 on the outside of the curved portion 105 is made constant. The heat exchange efficiency can be improved.

  Further, the notch 22d of the present embodiment is formed from at least one concave portion at the center of the front end portion (second side 22b) of the outer spacer 22, so that the front end portion (second side 22b) of the outer spacer 22 and The brazing area between the adjacent fins 22 is reduced symmetrically with respect to a straight line passing through the center of the tip (second side 22b) and parallel to the height direction of the outer spacer 22, and as a result, brazing. In the subsequent bending process, the outer end of the outer spacer 22 can be reliably removed from the adjacent fins 21 outside the bending portion 105.

  Since the inner spacer 23 has a buckling portion 23d between the second side 23b (tip portion) and the first side 23a (base portion), the inner spacer 23 has an inner side on the inner side of the bending portion 105 during bending after brazing. The spacers 23 are buckled without detaching from the fins 21, and as a result, the interval between the fins 21 inside the curved portion 105 can be made constant, and the heat exchange efficiency can be improved.

[Modification]
Next, a modification of the outer spacer 22 will be described with reference to FIG. However, the description of the embodiment is incorporated by using the same reference numerals as those in the embodiment for portions common to the embodiment.

9A and 9B are diagrams illustrating an outer spacer according to a modified example, in which FIG. 9A is a side view of a main part of a fin illustrating the outer spacer according to the modified example, and FIG. (C) is a principal part front view of the fin which shows the outer side spacer which concerns on a modification.
As shown in FIG. 9, the outer spacer 22B according to the modified example is different from the outer spacer 22 of the above-described embodiment in that the second side 22b of the tip portion includes notches 22e formed from a plurality of recesses. Yes. Specifically, the second side 22b of the outer spacer 22B includes a notch 22e formed by arranging four triangular recesses. According to such a notch 22e, it is possible to reduce the brazing area between adjacent fins 21 without reducing the function and strength as a spacer.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the gist of the present invention described in the claims. It can be changed.

  DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 2 ... Indoor unit, 3 ... Outdoor unit, 4 ... Heat exchanger, 5 ... Heat exchanger, 6 ... Compressor, 7 ... Expansion valve, 8 ... Four-way valve, 9 ... Case, 9a ... Blow Outlet, 10 ... Leg part, 11 ... Fan guard, 12 ... Wiring connection part, 13 ... Pipe connection part, 14 ... Cover, 15 ... Partition plate, 16 ... Machine room, 17 ... Heat exchange room, 18 ... Blower fan, 19 ... Flat tube, 19a ... Refrigerant flow path, 20 ... Header, 21 ... Fin, 21a ... Fitting part, 22, 22B ... Outer spacer, 22a ... First side, 22b ... Second side, 22c ... Side, 22d, 22e ... notch, 23 ... inner spacer, 23a ... first side, 23b ... second side, 23c ... side, 23d ... buckling part, 23e ... first side, 23f ... second side, 23g ... first 3 side edges, 24, 25 ... cut-and-raised hole, L ... virtual buckling line

Claims (4)

A heat exchanger,
A flat tube through which refrigerant flows,
A plurality of fins having a fitting portion for fitting the flat tube, extending in a direction intersecting the flat tube, and stacked in a length direction of the flat tube;
A first spacer formed by cutting and raising a part of the fin and maintaining a gap between the adjacent fins,
The first spacer has a buckling portion between a tip portion and a root portion.   The buckling portion includes a narrow width portion having a narrowest fin surface width between a tip portion of the first spacer and a root portion of the first spacer, and a tip portion of the first spacer and a root portion of the first spacer. The heat exchanger according to claim 2, wherein the heat exchanger is formed by any one of the thin wall portions having the thinnest plate thickness. The heat exchanger includes a second spacer that is formed by cutting and raising a part of the fin and maintaining a distance between adjacent fins,
Having a notch at the tip of the second spacer;
The first spacer is arranged at a position inside the flat tube after the L-shaped bending of the heat exchanger, and the second spacer is outside the flat tube after the L-shaped bending of the heat exchanger. The heat exchanger according to claim 1, wherein the heat exchanger is disposed at a position where   4. The heat exchanger according to claim 3, wherein the notch is formed from at least one recess in the center of the tip of the second spacer.

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