JPH0755379A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the bucking and/or drop-off of a corrugated fin by a method wherein the allowable amount of deformation due to compression of the corrugated fin is increased and the fin is retained reliably by a heat transfer tube. CONSTITUTION:Projections 25, causing sacrificed deformation locally on the crest of a corrugated fin 10, are provided on either one of a heat transfer tube 20 or a corrugated fin 10 or between them, then, laminated tube 20 and fin 10 are pressed whereby a sacrificed deformation 18 is caused locally on the crest of the fin 10 by the projections 25 while these tubes 20 and fins 10 are fixed to a fixing plate under this condition. When the heat transfer tube is laminated on the corrugated fin and they are pressed in such a manner, local sacrificed deformation is caused on the crest of the fin and the rigidity of the crest is reduced whereby the allowable amount of deformation due to compression of the whole body of the fin can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a radiator for automobiles and the like.
The present invention relates to a heat exchanger used as a heater, a condenser, a heater, or the like.

[0002]

2. Description of the Related Art A heat exchanger used as an automobile radiator, condenser or heater comprises a plurality of heat transfer tubes having a flat cross section and a core portion in which a plurality of corrugated fins are alternately laminated. The heat of the refrigerant flowing in the heat transfer tube is transferred from the wall of the heat transfer tube to the corrugated fins, and the corrugated fins exchange heat with the outside air.

In the core portion of such a heat exchanger, a plurality of heat transfer tubes 20 ... And a plurality of corrugated fins 10 ... Are alternately laminated as shown in FIG. It is adapted to be fixed to the arranged fixing plates 30, 30. Fixing portions (not shown) are formed on the fixing plates 30 and 30 with a predetermined pitch dimension, and the heat transfer tubes 20 ... Are connected to the corrugated fins 10.
It is designed to be fixed to these fixing parts in a state where they are laminated. In this case, since the interval between the heat transfer tubes 1 ...
, And the corrugated fins 10 are stacked and compressed by the pressurizing means 41, 42, whereby the corrugated fins 10 are compressed and deformed, and the intervals of the heat transfer tubes 20 are regulated to a fixed size to face the fixed portions. And is joined to these fixed parts.

After the core assembling process is completed, the process proceeds to cleaning, flux coating and brazing processes.

[0005]

By the way, in the core assembling process, the heat transfer tubes 20 ... And the corrugated fins 10 ... Have dimensional variations due to variations in processing and warpage, and such dimensional errors occur. If it is larger, the corrugated fin 10 is used in the compression process of the core portion.
... may be excessively compressed, or conversely may be under-compressed or not compressed at all.

When the corrugated fins 10 ... Are excessively compressed, the peaks are buckled and the louver portion formed between the peaks and the valleys (opposite peaks) is deformed. However, there is a drawback in that buckling occurs such that the entire corrugated shape is crushed and the heat exchange performance is significantly reduced. When the corrugated fins 10 ... Are insufficiently compressed or are not compressed at all, the corrugated fins 10 ... Float between the heat transfer tubes 20 ,.
There is a problem that the heat transfer tubes 20 are not joined and fall off.

Therefore, it is desirable that the corrugated fin be appropriately compressed. In order to provide the corrugated fins with appropriate compression, it is desirable that the corrugated fins have a large allowable amount of compressive deformation, and the large allowable amount of compressive deformation facilitates the compression work.

That is, in the conventional case, since the allowable amount of compressive deformation is small, excessive compression may result in buckling of the entire body. If the amount of compression is reduced in fear of occurrence of buckling, insufficient compression may occur. There was a problem that occurred.

The present invention has been made in view of the above circumstances. An object of the present invention is to increase the allowable amount of compressive deformation of the corrugated fins so that the corrugated fins can be reliably held by the heat transfer tube. An object of the present invention is to provide a heat exchanger capable of preventing the buckling and dropping of the heat exchanger.

[0010]

The first aspect of the present invention is to alternately stack a plurality of heat transfer tubes and a plurality of corrugated fins, and compress these in the stacking direction so that the ends of the heat transfer tubes and the corrugated fins are compressed. In a heat exchanger in which a portion is fixed to a fixed plate, a protrusion for locally sacrificing and deforming the corrugated fin peak portion is provided between one or both of the heat transfer tube and the corrugated fin, and the laminated heat transfer The tube and corrugated fins are compressed to locally sacrifice the peaks of the corrugated fins by the projections, and the heat transfer tubes and corrugated fins are fixed to the fixing plate in this compressed state.

According to the second aspect of the present invention, the heat-transfer tube and the corrugated fin are provided on one or both of them with protrusions for locally pressing the peaks of the corrugated fin at a plurality of intervals, and the protrusions are laminated. The heat transfer tube and the corrugated fins are compressed to press the ridges having a plurality of intervals among the plurality of ridges by the protrusions, and the ridges are preferentially deformed by this pressing, and all the ridges are formed. The heat transfer tubes and corrugated fins are fixed to a fixing plate in this compressed state.

[0012]

According to the first aspect of the present invention, when the heat transfer tube and the corrugated fins are compressed in a laminated state, the peaks of the corrugated fins are locally sacrificed, which reduces the rigidity of the peaks. However, the so-called waist becomes weaker, and the height of the protrusion is also added, and as a result, the entire deformation amount can be increased. Therefore, it is possible to increase the allowable amount of compressive deformation for a load that does not cause the fins to fall off when compressed, and avoid excessive compression or insufficient compression.

According to the second aspect of the present invention, when the heat transfer tube and the corrugated fins are compressed in a laminated state, the mountain portions having the intervals between the corrugated fins are concentratedly pressed, so that these concentratedly pressed mountains are pressed. The portion preferentially deforms, and after this deformation, the other crests come into contact with the tube, and further deformation proceeds in a state where all the crests have the same height, and finally the entire can be compressed. Therefore, it is possible to increase the allowable amount of compressive deformation for a load that does not cause the fins to fall off when compressed, and it is possible to prevent excessive compression or insufficient compression.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first invention will be described below based on the first embodiment shown in FIGS.

In FIG. 4, 10 is a corrugated fin made of a metal having a high thermal conductivity such as aluminum or an aluminum alloy, and 20 is a flat plate made of a metal having a high thermal conductivity such as aluminum or an aluminum alloy. Shaped heat transfer tubes 30, 30 and 30 are fixed plates that support the ends of the corrugated fins 10 ... And the heat transfer tubes 20 in a laminated state, and 41 and 42 are the corrugated fins 10 ... Is a pressurizing means for applying pressure in order to regulate the dimensions in the stacked state.

The corrugated fin 10 of this embodiment is shown in FIG.
As shown in FIG. 3, a louver portion 16 is formed between the peak portion 12 and the valley portion (which becomes the peak portion toward the opposite side) 14. The louver portion 16 is integrally formed by cutting and raising a wall between the mountain portion 12 and the valley portion 14.

The flat heat transfer tubes 20 of this embodiment are formed by extrusion.
A plurality of passages 22 are constituted by partition walls 21 in the interior of. The width of the flat heat transfer tubes 20 ... Is formed to be equal to or smaller than the width of the corrugated fins 10, and the crests 12 and the valleys 14 of the corrugated fins 10 are brazed or soldered to the flat outer surface. Are joined by.

Projections 25, 25 are formed along the longitudinal direction on the upper and lower outer surfaces of the flat heat transfer tubes 20. These protrusions 25, 25 extend in a band shape with a width smaller than the widths of the crests 12 and the troughs 14 of the corrugated fin 10, and the crest 1 of the corrugated fin 10 extends.
2 and the substantially central portion of the valley portion 14 are opposed to each other.

The projections 25, 25 having a trapezoidal cross section are integrally formed on the upper and lower outer surfaces of the flat heat transfer tubes 20 ..., and the extrusion die has such a cross sectional shape. And extruded, or as shown in FIG.
The protrusions 25, 25 may be processed by a pair of forming rollers 45, 46 as shown in FIG.

The corrugated fin 10 has a plate thickness of 0.1 mm, a width of 16 mm, a height H from the peak 12 to the valley 14 of 7.8 mm, and a pitch P of the peak of 2.25 to 3. 5 mm
The height of the protrusions 25 formed on the upper and lower surfaces of the flat heat transfer tube 20 is 0.05 to 0.1.
The width is about 5 mm and the width is about 1 to 3 mm.

The flat heat transfer tube 20 having such a configuration
.. and corrugated fins 10 are alternately laminated as shown in FIG. 4, and are pressed by the pressing means 41 and 42 in this laminated state. The pressure causes the corrugated fins 10 to be compressed. At the initial stage of the compression, the projections 25 formed on the upper and lower surfaces of the flat heat transfer tubes 20 are respectively formed in the peaks 12 and the valleys 14 of the corrugated fins 10. , 25 come into contact with each other, and these protrusions 25, 2
The contact point is pressed intensively by 5. That is, the protrusions 25, 25 push the central portions of the peaks 12 and the valleys 14 with a width smaller than the widths of the peaks 12 and the valleys 14 of the corrugated fins 10 ...
The central part of is pressed intensively, and these central parts are locally deformed. This local deformation exceeds the elastic deformation and is plastically deformed, that is, sacrificial deformation 18 ... Since the sacrificial deformation portions 18 ... Do not maintain the normal shape of the peaks and valleys, the sacrificial deformation portions 18 cannot maintain rigidity. That is,
The surface effective for maintaining the rigidity in the mountain portion 12 and the valley portion 14 is only the portion excluding the sacrificial deformation 18 ... Therefore, the rigidity is reduced in the mountain portion 12 and the valley portion 14, and the so-called waist becomes soft. , Easily deformed.

As a result, the heights of the projections 25, 25 are also added, and the allowable amount of compressive deformation from the load (fin drop-off preventing load) to the extent that the corrugated fins 10 ... If the amount of deformation is the same, the load can be reduced.

FIG. 3 is a characteristic diagram in which the relationship between the deformation amount and the compressive load in the case of the present embodiment is examined. In FIG. 3, the characteristic a is the conventional case and the characteristic b is the first case shown in FIG. This is the case of the embodiment. As can be understood from the characteristic b, when the local sacrificial deformations 18 ... Are generated in the peaks 12 and the valleys 14 of the corrugated fins 10, ...
The allowable amount of compressive deformation from the load for preventing the fins to fall off to buckling can be more than doubled as compared with the conventional case.

From the above, the corrugated fin 1
0 ... and the heat transfer tube 20 ... In the state of being laminated by the pressurizing means 41 and 42, even if the pressurizing load increases due to variations in materials and processing, the amount of deformation increases and the entire fin Buckling can be prevented,
Further, since the allowable amount of compressive deformation increases, buckling does not occur even if compressed a little more, and thus insufficient compression can be prevented.

From the above, the workability is improved and the yield is improved.

In the first embodiment, the case where the projections 25, 25 are integrally formed on the upper and lower surfaces of the flat heat transfer tube 20 has been described, but the present invention is not limited to this, and FIG.
2 and the third embodiment shown in FIG. 6 may be used.

That is, in the case of the second embodiment shown in FIG. 5, the protrusions 25a, 25a are formed by joining separately formed strip members to the upper and lower surfaces of the flat heat transfer tubes 20 ...
Is formed, and this action is similar to the first embodiment, and the peaks 12 and the valleys 14 of the corrugated fins 10 ...
Local sacrificial deformation 18 ...

Further, in the case of the third embodiment shown in FIG. 6, between the flat heat transfer tubes 20 ... And the corrugated fins 10 ...
The case of compressing with 0 sandwiched is shown. The strip plate-shaped contact plate 50 corresponds to the protrusion of the present invention and has a width smaller than the width of the peaks 12 and the valleys 14 of the corrugated fins 10 ... 20 .. and the corrugated fins 10 ... When interposed and pressed, the contact plate 50 intensively presses the central portions of the peaks 12 and the valleys 14, so that these central portions can be sacrificially deformed. .

The protrusions 25, 25 of each of these embodiments
a and 50 are not limited to having a trapezoidal cross section,
The shape may be a triangle or a semicircle, and the corrugated fins 10 are not limited to the sacrificial deformation portions formed in the central portions of the peaks 12 and the valleys 14, but the ends of the peaks 12 and the valleys 14 may be formed. A sacrificial deformation portion may be formed in the portion and the same mountain portion 12
Also, a plurality of sacrificial deformation portions may be formed in the same valley portion 14, respectively.

Next, a fourth embodiment shown in FIG. 7 will be described. In this embodiment, the flat heat transfer tubes 120 ... Are formed by welded tubes. The welded tube is formed by welding loop-shaped peripheral walls to each other at their ends, and even if the protrusions 125, 125 are formed on such a welded heat transfer tube 120, the corrugated fin 1 is formed.
A sacrificial deformation portion can be formed in the central portion of the peak portion 12 and the valley portion 14 of 0 ...

Incidentally, such a welding type heat transfer tube 1
Various methods as shown in FIG. 8 can be used to form the protrusions 125, 125 on the 20. That is, the example of FIG. 8A shows a case where the protrusions 125 and 125 are formed by the forming rollers 126 and 127 in the plate state 123 before welding into a tube shape.

Further, FIG. 8B shows a plate 123.
In the process of bending the tube into a tube shape, the forming rollers 131, 1
This is a case where the protrusions 125 are formed by 32.

8C shows the tube 12
This is a case where the protrusions 125 and 125 are formed by the forming rollers 135 and 136 after forming 0.

In the first to fourth embodiments, the heat transfer tubes 20 and 120 are provided with protrusions 25 and 25a.
Although the 125 is formed or the contact plate 50 which is a separate member is used to form the sacrificial deformation portion in the central portion of the peak portion 12 and the valley portion 14 of the corrugated fins 10 ...
As in the fifth embodiment shown in FIG.
Local protrusions 112 on the mountain portion 12 and the valley portion 14, respectively.
May be formed.

That is, in the case of the fifth embodiment shown in FIG. 9, the protrusions 11 are localized on the peaks 12 of the corrugated fins 10 ...
2 ... is formed, and the protrusions 112 ...
The protrusions 112 ... themselves are plastically deformed into sacrificial deformed portions, and this sacrificial deformation has a function of maintaining rigidity for holding the corrugated fin shape. Therefore, since the deformation is facilitated, the allowable amount of the entire compressive deformation with respect to the fin drop-off preventing load is increased.

Although the first to fifth embodiments have been described with respect to the first invention, the second invention will be described below. The sixth embodiment shown in FIGS. 10 and 11 corresponds to the second embodiment of the present invention. In FIG. 10, the corrugated fins 10 have different heights of their ridges. There is. That is, for example, every five mountain parts have large mountain parts 212 ... Of high height, and these high mountain parts 212 ...
It is about 2mm higher.

In this way, when the heat transfer tubes 20 ... And the corrugated fins 10 ... Are laminated and compressed, the corrugated fins 10 ... Deform as shown in FIG. 11 (B). That is, in the initial stage of pressing the corrugated fins 10 with the heat transfer tubes 20, ...
The lower surface of 0 hits the tall mountain portion 212 ...
As shown in FIG. 7A, the tall mountain portions 212 ... Are pushed.

Due to such pressing, the tall mountain portion 212
.. are preferentially pressed and deformed, then the other peaks 12 come into contact with the tubes 20. The deformation further progresses in a state where all the peaks have the same height. If it deforms excessively, it will buckle. However, the holding force of the fins 10 is already generated when the tall ridges 212 are slightly pushed, and there is no concern that the fins may come off even if they are not compressed more than necessary. Therefore, the amount of deformation of the tall ridges 212 ... And the amount of deformation of all the ridges after all the ridges come into contact with the tube 20 are added, and as a result, each ridge and valley contact the heat transfer tube 20. Thus, it is possible to increase the deformation allowable amount from the fin drop-off preventing load to the buckling of the entire corrugated fin 10 while ensuring a predetermined heat transfer area.

That is, by preferentially deforming the tall ridges 212, the height of the short ridges 12 is adjusted as a whole while avoiding buckling under a proper compression force,
It is possible to increase the allowable amount of compressive deformation.

In the characteristic diagram of the deformation amount and the compressive load shown in FIG. 3, the example indicated by the characteristic c is the case of FIG. As can be understood from this characteristic diagram, the allowable amount of compressive deformation until buckling can be increased compared to the conventional case.

In the sixth embodiment described above, the flat heat transfer tubes 20 have their peak portions raised at predetermined intervals, but the present invention is not limited to this, and the seventh embodiment shown in FIG. And the eighth embodiment shown in FIG. 13.

That is, in the case of the seventh embodiment shown in FIG. 12, the projections 325 are formed on the upper and lower surfaces of the flat heat transfer tubes 20 along the width direction at intervals in the longitudinal direction. The ridges 12 of the corrugated fins 10 ... Are pushed at intervals by the portions 325. Even in this case, the allowable amount of the compressive deformation as a whole is avoided by preferentially deforming a specific mountain portion 12 ... While avoiding buckling of the other mountain portion 12 ... Under an appropriate compressive force. Can be increased.

In the case of the eighth embodiment shown in FIG. 13, the flat heat transfer tubes 20 ... And the corrugated fins 10 are used.
A case is shown in which a contact plate 350 made of a band plate which is a member different from the above is sandwiched between and pressed. The strip-shaped abutment plate 350 preferentially elastically deforms the existing specific ridges 12 ... Therefore, buckling of the other ridges 12 ... The allowance can be increased.

Furthermore, the present invention may be applied to the ninth embodiment shown in FIG. That is, in the case of FIG. 14, the flat heat transfer tubes 20 have upper and lower surfaces with a space along the longitudinal direction, and the projections 45 are locally formed along the width direction.
0 ... Is formed.

In the case of such a structure, the peak portions 12 and the valley portions 14 of the corrugated fins 10 which are spaced apart from each other are pushed by the projections 450 ... At the initial stage of compression, and these are deformed every few pieces. Even in such a case, the protrusion 45
After the peaks 12 hit by 0 are preferentially pressed and deformed, the other peaks 12 come into contact with the tubes 20 and the deformation further progresses in a state where the heights of all the peaks are uniform. If the deformation becomes excessive, it will eventually cause buckling, but the fins 10 that have already hit the protrusions 450 have already been pushed a little when the peaks 12 ...
The holding force of ... occurs, and there is no concern that the fins may come off even if it is not compressed more than necessary. Therefore, the amount of deformation of the ridges 12 ...
The amount of deformation of all the ridges after the contact with the ridge is added, and as a result, the deformation allowable amount from the fin drop-off preventing load to the buckling can be increased.

That is, the case of the ninth embodiment shown in FIG. 14 can be regarded as a case where the first and second techniques of the present invention are used together.

[0047]

As described above, according to the first aspect of the present invention, when the heat transfer tube and the corrugated fins are compressed in a laminated state, a local sacrificial deformation occurs in the corrugated fins. The rigidity is decreased, the so-called waist is weakened, and the height of the protrusion is added, so that the deformation amount from the fin drop-off preventing load to the buckling can be increased. Therefore, it is possible to increase the allowable compression deformation amount when compressed, and avoid excessive compression or insufficient compression.

According to the second aspect of the present invention, when the heat transfer tube and the corrugated fin are compressed in a laminated state,
Since the ridges of the corrugated fins are pressed intensively at intervals, these ridges pressed intensively are deformed preferentially,
After that, the other peaks come into contact with the tube, and the deformation further proceeds with all the peaks having the same height. In this case, the fin retaining force is already generated when the preferentially deformed crest is slightly pushed, and there is no concern that the fin may fall off even if the fin is not compressed more than necessary. Therefore, the deformation allowable amount from the fin drop-off preventing load to the buckling can be increased.

Therefore, in each of the inventions, the corrugated fins can be securely held and held in the heat transfer tube while preventing buckling and falling off, which facilitates the compression work.
Yield improves.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a heat transfer tube and a corrugated fin showing a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a method for molding a heat transfer tube used in the same example.

FIG. 3 is a characteristic diagram showing a relationship between a deformation amount and a load.

FIG. 4 is a diagram illustrating a step of stacking and pressing a corrugated fin and a heat transfer tube.

FIG. 5 is an exploded perspective view of a heat transfer tube and a corrugated fin showing a second embodiment of the present invention.

FIG. 6 is an exploded perspective view of a heat transfer tube and a corrugated fin showing a third embodiment of the present invention.

FIG. 7 is an exploded perspective view of a heat transfer tube and a corrugated fin showing a fourth embodiment of the present invention.

FIGS. 8A, 8B, and 8C are views for explaining different molding methods of the heat transfer tube used in the embodiment.

FIG. 9 is an exploded perspective view of a heat transfer tube and a corrugated fin showing a fifth embodiment of the present invention.

FIG. 10 is an exploded perspective view of a heat transfer tube and a corrugated fin showing a sixth embodiment of the present invention.

FIG. 11 is a view for explaining the operation of the embodiment, FIG. 11 (A) is a diagram before compression, and FIG. 11 (B) is a diagram for explaining the state of the corrugated fins after compression.

FIG. 12 is an exploded perspective view of a heat transfer tube and a corrugated fin showing a seventh embodiment of the present invention.

FIG. 13 is an exploded perspective view of a heat transfer tube and a corrugated fin showing an eighth embodiment of the present invention.

FIG. 14 is an exploded perspective view of a heat transfer tube and a corrugated fin showing a ninth embodiment of the present invention.

[Explanation of symbols]

10 ... Corrugated fins, 12 ... Mountain parts, 14 ... Valley parts, 1
6 ... Louver part, 18 ... Sacrificial deformation part, 20 ... Heat transfer tube, 25, 25a, 50, 112, 125, 212, 3
25, 350, 450 ... Protrusions.

[Procedure amendment]

[Submission date] May 12, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

According to the second aspect of the present invention, the heat-transfer tube and the corrugated fin are provided on one or both of them with protrusions for locally pressing the peaks of the corrugated fin at a plurality of intervals, and the protrusions are laminated. The heat transfer tube and the corrugated fin are compressed to press the ridges having a plurality of intervals among the plurality of ridges by the protrusions, and by this pressing, these ridges are preferentially deformed and other ridges are formed. Moderate pressure
The height of the entire ridge portions substantially equal giving shrinkage force, the fin
A holding force is given , and the heat transfer tube and the corrugated fins are fixed to a fixing plate in this compressed state.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

According to the first aspect of the present invention, when the heat transfer tube and the corrugated fins are compressed in a laminated state, a local sacrificial deformation is generated in the ridges of the corrugated fins, which lowers the rigidity of the ridges. However, the so-called waist becomes weaker, and the height of the protrusion is also added, and as a result, the entire deformation amount can be increased. Therefore, it is possible to increase the allowable amount of compressive deformation from a load that does not cause the fins to fall off when compressed, and it is possible to avoid excessive compression or insufficient compression.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

According to the second aspect of the present invention, when the heat transfer tube and the corrugated fins are compressed in a laminated state, the mountain portions with the intervals between the corrugated fins are intensively pushed, so that these intensively pushed mountains are pushed. The portion is preferentially deformed, and after this deformation, the other peaks come into contact with the tube, and further deformation proceeds with all the peaks having the same height, and eventually buckling occurs .
Therefore, it is possible to increase the allowable amount of compressive deformation from a load that does not cause the fins to fall off when compressed, and it is possible to prevent excessive compression or insufficient compression.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

That is, in the case of the fifth embodiment shown in FIG. 9, the protrusions 11 are localized on the peaks 12 of the corrugated fins 10 ...
2 ... is formed, and the protrusions 112 ...
The protrusions 112 ... themselves are plastically deformed into sacrificial deformed portions, and this sacrificial deformation has a function of maintaining rigidity for holding the corrugated fin shape. Therefore, since the deformation is facilitated, the allowable amount of the entire compressive deformation from the fin drop-off preventing load is increased.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

Due to such pressing, the tall mountain portion 212
.. are preferentially pressed and deformed, then the other peaks 12 come into contact with the tubes 20. The deformation further progresses in a state where all the peaks have the same height. If it deforms excessively, it will buckle. On the other hand, the holding force of the fins 10 has already been generated when the tall ridges 212 ... Are pushed a little, and there is no concern that the fins may come off even if they are not compressed more than necessary. Therefore,
The amount of deformation of the tall mountain part 212 ... and all the mountains are tube 2
The amount of deformation of all the peaks after contact with 0 is added, and as a result, the peaks and valleys respectively contact the heat transfer tubes 20 ... While ensuring a predetermined heat transfer area, the corrugated fin 10 is secured.
It is possible to increase the deformation allowable amount from the entire fin drop-off preventing load to the buckling.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction content]

In the characteristic diagram of the deformation amount and the compressive load shown in FIG. 3, the example indicated by the characteristic c is the case of FIG. As you can understand from this characteristic diagram, prevention of fin falling off
The allowable amount of compressive deformation from load to buckling can be increased as compared with the conventional one.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

In the case of the eighth embodiment shown in FIG. 13, the flat heat transfer tubes 20 ... And the corrugated fins 10 are used.
A case is shown in which a contact plate 350 made of a band plate which is a member different from the above is sandwiched between and pressed. The strip-shaped abutment plate 350 lies a certain crests 12 ... now to preferentially elastically deformed, and thus applies the other ridges 12
Buckling can be avoided under a moderate compression force, and the allowable amount of compressive deformation can be increased as a whole. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 12, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 11

[Correction method] Change

[Correction content]

FIG. 11

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kame Kobayashi 1-1, Showa-cho, Kariya city, Aichi prefecture, Nihon Denso Co., Ltd. (72) Inventor Haruhiko Otsuka 1-1-1-1, Showa town, Kariya city, Aichi prefecture Within the corporation

Claims (6)

[Claims] 1. A heat exchanger in which a plurality of heat transfer tubes and a plurality of corrugated fins are alternately stacked, and the ends of the heat transfer tubes and the corrugated fins are fixed to a fixing plate in a state where they are compressed in the stacking direction. A protrusion for locally sacrificing and deforming the mountain portion of the corrugated fin is provided between one or both of the heat transfer tube and the corrugated fin, and the laminated heat transfer tube and corrugated fin are compressed to form the protrusion. The heat exchanger characterized in that the sacrificial deformation of the corrugated fins is locally generated by the above, and the heat transfer tubes and the corrugated fins are fixed to the fixing plate in this compressed state. 2. The projection according to claim 1, wherein the projection has a ridge shape having a width narrower than the width of the peak of the corrugated fin along the longitudinal direction of the heat transfer tube. Heat exchanger. 3. The heat exchanger according to claim 1, wherein the protrusion is a protrusion formed on a mountain portion of the corrugated fin and having a width narrower than a width of the mountain portion. 4. A heat exchanger in which a plurality of heat transfer tubes and a plurality of corrugated fins are alternately laminated, and the ends of the heat transfer tubes and corrugated fins are fixed to a fixing plate in a state where they are compressed in the stacking direction. , Either one of the heat transfer tube and the corrugated fin, or between these, a protrusion for locally pressing the peaks of the corrugated fin at a plurality of intervals is provided, and the laminated heat transfer tube and corrugated fin are compressed. Then, by pressing the mountain portion having a plurality of intervals among the plurality of mountain portions by the projection portion, by the pressing, these mountain portions are preferentially deformed to make the heights of all mountain portions substantially equal, A heat exchanger characterized in that, in this compressed state, these heat transfer tubes and corrugated fins are fixed to a fixing plate. 5. The heat exchanger according to claim 4, wherein the protrusion is formed by increasing the height of the corrugated fins for each of the plurality of peaks. 6. The heat exchanger according to claim 4, wherein the protrusions are protrusions formed on the heat transfer tube at intervals along the longitudinal direction.