JP2011228580A - Laminated heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure where inner fins laminated for three steps or above by folding one metal plate can be formed while displacement between the inner fins adjacent in a lamination direction is suppressed in a laminated heat exchanger using web fins as the inner fins and having the inner fins laminated in one flow channel for three stages or above.SOLUTION: Inner fins 33 for three stages are formed by folding one metal plate by installing two folding portions 5. When one coupling portion 332 arranged on one side of the lamination direction in two coupling portions 332 connected to one plate portion 331 in the inner fin 33 is set to be an apex 51 and the other coupling portion arranged on the other side of the lamination direction is set to be a trough 52, the folding portion 5 between the inner fin 33 in a second stage and the inner fin 33 in a third stage consists of the trough 52 of the inner fin 33 in the second stage and the apex 51 of the inner fin 33 in the third stage.

Description

  The present invention relates to a stacked heat exchanger in which flow channel tubes through which a heat medium flows and heat exchange objects are alternately stacked.

  Conventionally, in order to dissipate heat from a heating element such as a semiconductor module incorporating a semiconductor element, a multilayer heat exchanger is known in which a flow path tube is disposed so as to sandwich the heating element from both sides. . Such a stacked heat exchanger has a configuration in which heating elements and flow path tubes are alternately stacked. The plurality of stacked flow path tubes are communicated by a communication member, and a cooling medium flows in each flow. It is comprised so that it may distribute | circulate to a route pipe.

  In this type of stacked heat exchanger, in order to improve heat exchange performance, a partition member is provided in the flow path pipe, and the heat medium flow path is arranged in two stages in the thickness direction of the flow path pipe. In addition to this, there is disclosed a structure in which inner fins are arranged in each of the heat medium channels formed in two stages (see, for example, Patent Document 1).

  By the way, in this kind of laminated heat exchanger, since the heat medium is distributed from the communicating member to each flow path tube, the flow rate of the heat medium in the flow path tube becomes slow. In order to improve the heat exchange performance in the minute flow rate region in such a flow channel tube, a wave fin having a function of promoting mixing of the heat medium in the flow channel tube is used as the inner fin, and the wave fin is connected to the flow channel tube. A two-layered product in the thickness direction (flow channel tube stacking direction) is disclosed (for example, see Patent Document 2).

JP 2005-191527 A JP 2010-10418 A

  By the way, the above-mentioned Patent Document 2 discloses a structure in which two stages of wave fins are laminated by bending a single metal plate (see Example 5 of Patent Document 2).

  Here, when laminating three or more stages of wave fins, as shown in FIG. 9, the wave fins are folded back and between the second stage inner fin J33B and the third stage inner fin J33C, It is necessary to provide two bending starting points J5. At this time, the plane portion J34 formed between the two bending start points J5 cannot always be parallel to the stacking direction of the flow path tubes. If the flat surface portion J34 is inclined with respect to the thickness direction of the flow path tube, there is a problem in that a positional shift occurs between the second-stage inner fin J33B and the third-stage inner fin J33C.

  That is, if two bending start points J5 are provided between the second-stage inner fin J33B and the third-stage inner fin J33C, the two bending start points J5 may be relatively displaced in the width direction of the flow path tube. Inevitably exists. When the two bending start points J5 are relatively displaced in the width direction of the flow path pipe, the third stage inner fin J33C is displaced in the width direction of the flow path pipe with respect to the second stage inner fin J33B. Therefore, a positional deviation occurs between the second-stage inner fin J33B and the third-stage inner fin J33C.

  By the way, the improvement of the heat exchange performance by laminating wave fins in multiple stages is the effect of waves when viewed from the laminating direction of the channel pipes, that is, the effect of forming the heat medium flow in the width direction of the channel pipes. This is due not only to this, but also to the effect of promoting mixing by forming a heat medium flow in the stacking direction of the flow path tubes. Here, if a positional shift occurs between the second-stage inner fin J33B and the third-stage inner fin J33C, the heat medium is mixed in different ways, and stable heat exchange performance can be ensured. Can not.

  On the other hand, in order to provide inner fins laminated in three or more stages, instead of forming the inner fins from a single metal plate, a method of simply laminating them after forming a plurality of wave fins separately. Can be considered. However, it is very difficult to stack a plurality of stages of wave fins configured as separate bodies so that positional displacement does not occur.

  In view of the above points, the present invention uses a wave fin as an inner fin and, in a stacked heat exchanger having inner fins stacked in three or more stages in one flow channel tube, between inner fins adjacent in the stacking direction. It is an object of the present invention to provide a configuration capable of forming inner fins laminated in three or more stages by bending one metal plate while suppressing misalignment.

  In order to achieve the above object, in the invention according to claim 1, the inner fin (33) is formed between the plate portion (331) extending in the longitudinal direction of the flow channel tube (3) and the adjacent plate portion (331). A wave fin having a connecting portion (332) to be connected, a cross-sectional shape orthogonal to the longitudinal direction being wavy, and the plate portion (331) being refracted into a corrugated shape in the longitudinal direction when viewed from the stacking direction. The fin (33) is stacked in the flow path pipe (3) in the stacking direction of the flow path pipe (3) by M stages (M is an integer of 3 or more), and the M stage inner fin (33) is 1 Two connecting portions that are formed by providing (M-1) folding portions (5) and folding one metal plate, and are connected to one plate portion (331) in the inner fin (33). Of (332), the top ( 1), and when the trough (52) is disposed on the other side in the stacking direction, the inner fin (33) and the N stage of the (N-1) stage (N is an integer of 2 or more and M or less) The folded portion (5) between the inner fins (33) of the eyes includes the valley (52) of the (N-1) th stage inner fin (33) and the top of the Nth stage inner fin (33). (51).

  According to this, the folding | returning part (5) between the inner fin (33) of the (N-1) step and the inner fin (33) of the N step, ie, one folding start point, can be made. For this reason, it cannot occur that the said folding | returning part (5) shift | deviates relatively to a flow-path pipe width direction. Therefore, the position shift between the inner fins (33) adjacent to each other in the flow path tube stacking direction can be suppressed. As a result, it is possible to form inner fins (33) that are laminated in three or more stages by bending one metal plate while suppressing displacement between adjacent inner fins (33) in the lamination direction. .

  In the invention according to claim 2, in the stacked heat exchanger according to claim 1, the direction perpendicular to both the longitudinal direction and the stacking direction of the channel tube (3) is set to the channel tube width direction. In this case, the length (W1) in the channel width direction of the valley portion (52) constituting the folded portion (5) of the (N-1) -th inner fin (33) is (N-1). It is half of the length (W2) in the flow path tube width direction in the other valley part (52) of the inner fin (33) of the stage, and the folded part (5) of the inner fin (33) of the N stage The length (W3) in the channel tube width direction at the top portion (51) constituting the length of the channel tube width direction (W4) at the other top portion (51) of the N-th inner fin (33). It is characterized by being halved.

  According to this, since the top part (51) of the (N-1) -th inner fin (33) and the valley part (52) of the N-th inner fin (33) can be made to face each other, (N -1) The heat medium flowing along the inner fin (33) of the stage and the heat medium flowing along the inner fin (33) of the N stage are in a meandering manner opposite to each other. It becomes possible to improve heat exchange performance.

  Further, as in the invention according to claim 3, in the stacked heat exchanger according to claim 1 or 2, the top (51) of the inner fin (33) is composed of two half-tops (51a). In addition, the length in the channel pipe width direction of the half top portion (51a) is half of the length in the channel tube width direction of the top portion (51), and the valley portion (52 of the inner fin (33)) ) Is composed of two half valleys (52a), and the length of the half valley (52a) in the flow channel width direction is half of the length of the valley (52) in the flow channel width direction. It is connected to each of one top part (51) in the inner fin (33), two plate parts (331) connected to the top part (51), and the two plate parts (331). The part composed of the half valley part (52a) is the mountain part (6), and the inner fin ( 3), one half top portion (51a), one plate portion (331) connected to the half top portion (51a), and half valley portion (52a) connected to the plate portion (331). When the portion to be formed is a half-mountain portion (7), the inner fins (33) of each step are respectively composed of S (S is a natural number) peaks (6) and one half-mountain portion (7). It may be.

  Further, as in the invention described in claim 4, in the stacked heat exchanger according to claim 1 or 2, the inner fin (33) is provided in the channel tube (3) in the channel tube (3). Three layers are stacked in the stacking direction, and the first-stage inner fin (33) includes T (T is an integer of 2 or more) peaks (6), and the second-stage inner fin ( 33) is composed of (T-1) peak portions (6) and one half peak portion (7), and the third inner fin (33) is (T-1) peaks. You may be comprised from a part (6) and one half peak part (7), T peak part (6), or (T-1) peak part (6).

  Further, as in the invention described in claim 5, in the stacked heat exchanger according to claim 1 or 2, the inner fin (33) is provided in the channel tube (3) in the channel tube (3). Three layers are stacked in the stacking direction, and the first and third inner fins (33) are each composed of U (U is a natural number) peaks (6). The inner fin (33) may be composed of U ridges (6) and one half ridge (7).

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a front view which shows the laminated heat exchanger 1 which concerns on 1st Embodiment. It is AA sectional drawing of FIG. The inner fin 33 in 1st Embodiment is shown, (a) is sectional drawing, (b) is a top view. It is typical sectional drawing which looked at the inner fin 33 in 1st Embodiment from the flow-path pipe longitudinal direction. It is typical sectional drawing which looked at the inner fin 33 in 2nd Embodiment from the flow-path pipe longitudinal direction. It is typical sectional drawing which looked at the inner fin 33 in 3rd Embodiment from the flow-path pipe longitudinal direction. It is typical sectional drawing which looked at the inner fin 33 in 4th Embodiment from the flow-path pipe longitudinal direction. It is the typical sectional view which looked at inner fin 33 in a 5th embodiment from a channel pipe longitudinal direction. It is a perspective view which shows the inner fin in the conventional laminated heat exchanger.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing a stacked heat exchanger 1 according to the first embodiment.

  As shown in FIG. 1, the laminated heat exchanger 1 of the present embodiment cools a plurality of electronic components 2 as heat exchange objects from both sides, and a heat medium flow path 30 (see FIG. 2) and a communication member 4 that communicates the plurality of flow channel tubes 3 with each other. A plurality of flow path tubes 3 are arranged in a stacked manner so that the electronic component 2 can be sandwiched from both sides.

  In the present embodiment, as the electronic component 2, a semiconductor module incorporating a semiconductor element such as an IGBT and a diode is used. The semiconductor module can be used for an inverter for automobiles, a motor drive inverter for industrial equipment, an air conditioner inverter for building air conditioning, and the like. In addition to the semiconductor module, for example, a power transistor, a power FET, an IGBT, or the like can be used as the electronic component 2.

  FIG. 2 is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 2, the channel tube 3 of this embodiment has a so-called drone cup structure. That is, the flow path pipe 3 is configured to have a pair of outer shell plates 31, and the heat medium flow path 30 is formed between the pair of outer shell plates 31.

  An inner fin 33 that divides the heat medium flow path 30 into a plurality of narrow flow paths 333 and increases the heat transfer area between the heat medium and the flow path pipe 3 is provided in the flow path pipe 3. In the present embodiment, the inner fins 33 are stacked in three stages in the stacking direction of the channel tubes 3 (hereinafter referred to as the channel tube stacking direction) between the pair of outer shell plates 31, that is, in the heat medium channel 30. Has been placed. Details of the inner fin 33 will be described later.

  Returning to FIG. 1, two electronic components 2 are provided for each of the pair of outer shell plates 31 of the channel tube 3. The two electronic components 2 provided on each outer shell plate 31 are arranged in series in the flow direction of the heat medium.

  Further, at both ends in the longitudinal direction of the outer shell plate 31 of the flow channel tube 3, a substantially cylindrical flange portion 300 that protrudes to the outside, that is, the side of the other adjacent flow channel tube 3 is formed. And the communication member 4 which connects the several flow path pipes 3 is formed by joining the flange parts 300 of the adjacent flow path pipes 3 by brazing.

  When the channel tube 3 disposed on the outermost side in the stacking direction among the plurality of channel tubes 3 is an outer channel tube 3a, both ends in the longitudinal direction of one outer channel tube 3a of the two outer channel tubes 3a. The unit is connected with a heat medium inlet 401 for introducing the heat medium into the laminated heat exchanger 1 and a heat medium outlet 402 for discharging the heat medium from the laminated heat exchanger 1, respectively. Yes. The heat medium introduction port 401 and the heat medium discharge port 402 are joined to one outer flow path pipe 3a by brazing. In addition, the flow path pipe 3, the communication member 4, the heat medium introduction port 401, and the heat medium discharge port 402 of this embodiment are made of aluminum.

  The heat medium introduced from the heat medium introduction port 401 flows into the flow channel pipe 3 from one end portion in the longitudinal direction through the communication member 4, and the inside of each heat medium flow channel 30 to the other end portion. It flows toward. The heat medium is discharged from the heat medium discharge port 402 through the communication member 4. As described above, while the heat medium flows through the heat medium flow path 30, heat exchange is performed with the electronic component 2 to cool the electronic component 2. As the heat medium, in this embodiment, water mixed with an ethylene glycol antifreeze is used.

  3A and 3B show the inner fins 33 in the first embodiment, where FIG. 3A is a cross-sectional view as viewed from the longitudinal direction of the channel tube 3 (hereinafter referred to as channel channel longitudinal direction), and FIG. It is the top view seen from the pipe lamination direction.

  As shown in FIG. 3, wave fins are used as the three-stage inner fins 33 that are stacked in one flow path tube 3. Specifically, the inner fin 33 includes a plate portion 331 that extends in the longitudinal direction of the flow channel tube and divides the narrow flow channel 333, and a connecting portion 332 that connects adjacent plate portions 331, and the longitudinal direction of the flow channel tube. A cross-sectional shape orthogonal to the trapezoidal wave shape is formed, and the plate portion 331 is formed so as to be refracted in a triangular waveform in the longitudinal direction of the flow channel when viewed from the flow channel stacking direction.

  FIG. 4 is a schematic cross-sectional view of the inner fin 33 according to the first embodiment as viewed from the longitudinal direction of the channel tube. Here, out of the two connecting portions 332 connected to one plate portion 331 in the inner fin 33, the one arranged on one side (the upper side in FIG. 4) in the flow channel tube stacking direction is the top portion 51, and the flow channel What is arranged on the other side (the lower side in FIG. 4) in the tube stacking direction is a trough 52. Further, the direction perpendicular to both the longitudinal direction of the channel pipe and the direction in which the channel tubes are laminated is defined as a channel tube width direction.

  The three-stage inner fins 33 are formed by folding a single metal plate by providing two folded portions 5. Specifically, the inner fins 33 that are stacked in three stages are formed by folding back one metal plate toward the other side in the channel tube stacking direction at the two folded portions 5.

  The folded portion 5 between the first-stage inner fin 33A and the second-stage inner fin 33B is constituted by a valley 52 of the first-stage inner fin 33A and a top 51 of the second-stage inner fin 33B. Has been. Similarly, the folded portion 5 between the second-stage inner fin 33B and the third-stage inner fin 33C has a valley 52 of the second-stage inner fin 33B and a top 51 of the third-stage inner fin 33C. It is comprised by.

  The length W1 in the channel width direction of the valley portion (hereinafter referred to as the folded valley portion 520) constituting the folded portion 5 of the first and second stage inner fins 33A and 33B is the first and second stage inner fins 33A. , 33B is half the length W2 of the other trough portion 52 in the flow channel width direction. Further, the length W3 in the channel tube width direction at the top portion (hereinafter referred to as the folded top portion 510) constituting the folded portion 5 of the second and third stage inner fins 33B and 33C is the second and third stage inner fins 33B. , 33C is half of the length W4 in the channel tube width direction at the other top portion 51 of C.

  Here, it can be said that the top portion 51 of the inner fin 33 is composed of two half-top portions 51 a having a length that is half the length of the top portion 51 in the flow channel width direction. Moreover, it can be said that the valley part 52 of the inner fin 33 is comprised from the two half valley parts 52a which have a length of the half of the length of the flow path pipe lamination direction of the valley part 52. FIG.

  Hereinafter, in the inner fin 33, a portion composed of one top portion 51, two plate portions 331 connected to the top portion 51, and a half valley portion 52a connected to each of the two plate portions 331 is a mountain. It is called part 6. Further, in the inner fin 33, a portion composed of one half-top portion 51 a, one plate portion 331 connected to the half-top portion 51 a, and half valley portion 52 a connected to the plate portion 331 is a half-mountain portion 7. That's it.

  At this time, in the present embodiment, the first-stage inner fin 33 </ b> A is composed of eight peak portions 6. The second-stage inner fin 33 </ b> B is composed of eight peak portions 6 and one half peak portion 7. More specifically, in the second-stage inner fin 33B, the half-crest portion 7 is disposed at the folded portion 5 with the first-stage inner fin 33A.

  In the third-stage inner fin 33 </ b> C, one half crest 7 is arranged on each side of the seven crests 6. For this reason, it can be said that the third-stage inner fin 33 </ b> C is composed of eight peak portions 6.

  As described above, the folded-back portion 5 between the second-stage inner fin 33B and the third-stage inner fin 33C is connected to the valley 52 of the second-stage inner fin 33B and the third-stage inner fin 33C. The top portion 51 can be used to make the folded portion 5 between the second-stage inner fin 33B and the third-stage inner fin 33C, that is, one folding start point. For this reason, the folding | returning part 5 cannot shift | deviate relatively to a flow-path pipe width direction. Therefore, it is possible to suppress the positional deviation between the second-stage inner fin 33B and the third-stage inner fin 33C. As a result, it is possible to form the inner fins 33 that are stacked in three stages by bending one metal plate while suppressing the displacement between the second-stage inner fins 33B and the third-stage inner fins 33C. It becomes.

  In addition, the length W1 in the flow channel width direction of the folded valley portion 520 of the first and second inner fins 33A and 33B is set to the flow channel in the other valley portion 52 of the first and second inner fins 33A and 33B. The length W3 in the flow path tube width direction at the folded top portion 510 of the second and third stage inner fins 33B and 33C is made half of the length W2 in the pipe width direction, and the second and third stage inner fins 33B and By making the length W4 in the flow path tube width direction half of the other top portion 51 of 33C, the top portions 51 and the valley portions 52 of the inner fins 33 adjacent to each other in the flow tube stacking direction can be made to face each other. . As a result, the heat medium flowing along the one inner fin 33 and the heat medium flowing along the other inner fin 33 perform meandering in opposite directions, thereby improving the heat exchange performance. Is possible.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. Compared with the first embodiment, the second embodiment adds a half mountain portion 7 to the end portion on the opposite side of the bent portion 5 in the flow channel width direction of the first-stage inner fin 33A, and 3 The difference is that the half peak portion 7 arranged at the end opposite to the bent portion 5 in the inner fin 33 </ b> B of the step is changed to the peak portion 6.

  FIG. 5 is a schematic cross-sectional view of the inner fin 33 according to the second embodiment as viewed from the longitudinal direction of the channel tube. As shown in FIG. 5, the inner fins 33 at each stage are each composed of eight peak portions 6 and one half peak portion 7. Specifically, in the first-stage inner fin 33 </ b> A, the half-crest portion 7 is arranged at the end opposite to the bent portion 5 in the flow path tube width direction. Further, in the second-stage inner fin 33 </ b> B, the half-ridge part 7 is arranged at the folded-back part 5 with the first-stage inner fin 33 </ b> A. Further, in the third-stage inner fin 33 </ b> C, the half-crest portion 7 is disposed at the folded portion 5 with the second-stage inner fin 33 </ b> B.

  Also in the present embodiment, the folded portion 5 between the second-stage inner fin 33B and the third-stage inner fin 33C is replaced with the valley 52 of the second-stage inner fin 33B and the third-stage inner fin 33C. Therefore, the same effect as the first embodiment can be obtained.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. Compared with the first embodiment, the third embodiment reduces the number of peak portions 6 of the second and third stage inner fins 33B and 33C by one, and at the third stage inner fin 33B. The difference is that the half ridge 7 arranged at the end opposite to the bent portion 5 is changed to the ridge 6.

  FIG. 6 is a schematic cross-sectional view of the inner fin 33 according to the third embodiment as viewed from the longitudinal direction of the channel tube. As shown in FIG. 6, the first-stage inner fin 33 </ b> A includes eight peak portions 6. The second-stage inner fin 33 </ b> B is composed of seven peak portions 6 and one half peak portion 7. More specifically, in the second-stage inner fin 33B, the half-crest portion 7 is disposed at the folded portion 5 with the first-stage inner fin 33A.

  The third-stage inner fin 33 </ b> C is composed of seven peak portions 6 and one half peak portion 7. More specifically, in the third-stage inner fin 33 </ b> C, the half-crest portion 7 is arranged at the folded-back portion 5 with the second-stage inner fin 33 </ b> B.

  Also in the present embodiment, the folded portion 5 between the second-stage inner fin 33B and the third-stage inner fin 33C is replaced with the valley 52 of the second-stage inner fin 33B and the third-stage inner fin 33C. Therefore, the same effect as the first embodiment can be obtained.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is different from the third embodiment in that a semi-peak portion 7 is added to the end of the third-stage inner fin 33C opposite to the bent portion 5 in the flow channel width direction. Is.

  FIG. 7 is a schematic cross-sectional view of the inner fin 33 according to the fourth embodiment as viewed from the longitudinal direction of the channel tube. As shown in FIG. 7, in the third-stage inner fin 33 </ b> C of the present embodiment, one half peak portion 7 is arranged on each end side of the seven peak portions 6. For this reason, it can be said that the third-stage inner fin 33 </ b> C is composed of eight peak portions 6.

  Also in the present embodiment, the folded portion 5 between the second-stage inner fin 33B and the third-stage inner fin 33C is replaced with the valley 52 of the second-stage inner fin 33B and the third-stage inner fin 33C. Therefore, the same effect as the first embodiment can be obtained.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. Compared with the third embodiment, the fourth embodiment is a semi-peak portion in which the peak portion 6 disposed at the end portion on the opposite side to the bent portion 5 in the flow path pipe width direction of the third-stage inner fin 33 </ b> C. 7 is different.

  FIG. 8 is a schematic cross-sectional view of the inner fin 33 according to the fifth embodiment as viewed from the longitudinal direction of the channel tube. As shown in FIG. 8, in the third-stage inner fin 33 </ b> C of the present embodiment, one half-crest portion 7 is arranged on each side of the six crest portions 6. For this reason, it can be said that the third-stage inner fin 33 </ b> C is composed of seven peak portions 6.

  Also in the present embodiment, the folded portion 5 between the second-stage inner fin 33B and the third-stage inner fin 33C is replaced with the valley 52 of the second-stage inner fin 33B and the third-stage inner fin 33C. Therefore, the same effect as the first embodiment can be obtained.

(Other embodiments)
In each of the above-described embodiments, the example in which the inner fins 33 are arranged in three layers in one flow channel pipe 3 has been described. However, the present invention is not limited to this, and four or more inner fins 33 are formed in one flow channel tube 3. May be laminated.

Reference Signs List 3 Channel pipe 5 Folded section 6 Peak section 7 Half peak section 33 Inner fin 51 Top section 52 Valley section 331 Plate section 332 Connection section 333 Narrow channel

Claims (5)

A plurality of flow pipes (3) having a heat medium flow path (30) through which the heat medium flows;
A communication member (4) communicating with the plurality of flow path pipes (3),
The plurality of flow channel pipes (3) are arranged so as to sandwich the heat exchange object (2) alternately arranged with the flow channel pipes (3) from both sides,
The heat medium flow path (30) is divided into a plurality of narrow flow paths (333) in the flow path pipe (3), and the heat transfer area between the heat medium and the flow path pipe (3) is increased. A laminated heat exchanger provided with an inner fin (33),
The inner fin (33) includes a plate portion (331) extending in the longitudinal direction of the flow path pipe (3) and a connecting portion (332) connecting between the adjacent plate portions (331), The cross-sectional shape orthogonal to the direction is a wave shape, and when viewed from the stacking direction, the plate portion (331) is a wave fin that is refracted into a waveform in the longitudinal direction,
The inner fin (33) is stacked in M stages (M is an integer of 3 or more) in the stacking direction of the channel pipe (3) in the channel pipe (3),
The M-stage inner fin (33) is formed by folding a single metal plate with (M-1) folded portions (5),
Of the two connecting portions (332) connected to one plate portion (331) in the inner fin (33), the one arranged on one side in the stacking direction is a top portion (51), and When what is arranged on the other side of the direction is the valley (52),
The folded portion (5) between the inner fin (33) of the (N-1) stage (N is an integer of 2 or more and M or less) and the inner fin (33) of the N stage is the (N -1) Laminated heat characterized by being constituted by the valley (52) of the inner fin (33) of the stage and the top (51) of the inner fin (33) of the N stage Exchanger. When the direction perpendicular to both the longitudinal direction of the flow pipe (3) and the stacking direction is the flow pipe width direction,
The length (W1) in the channel tube width direction of the valley portion (52) constituting the folded portion (5) of the (N-1) -th inner fin (33) is the (N-1) ) Half of the length (W2) in the channel pipe width direction in the other valley portion (52) of the inner fin (33) at the stage,
The length (W3) of the N-stage inner fin (33) in the channel pipe width direction at the top (51) constituting the folded portion (5) is the N-stage inner fin (33). 2. The stacked heat exchanger according to claim 1, wherein the other top portion (51) is a half of the length (W 4) in the flow path tube width direction. When the direction perpendicular to both the longitudinal direction of the flow pipe (3) and the stacking direction is the flow pipe width direction,
The top part (51) of the inner fin (33) is composed of two half top parts (51a), and the length of the half top part (51a) in the channel pipe width direction is the top part (51). ) Is half the length of the flow passage tube width direction,
The valley portion (52) of the inner fin (33) is composed of two half valley portions (52a), and the length of the half valley portion (52a) in the flow channel width direction is the valley portion. (52) is half the length of the flow channel tube width direction,
In the inner fin (33), one top part (51), two plate parts (331) connected to the top part (51), and each of the two plate parts (331) are connected. A part composed of the half valley part (52a) is a mountain part (6),
One said half top part (51a) in the said inner fin (33), one said board part (331) connected to the said half top part (51a), and the said half valley connected to the said board part (331) When the part composed of the part (52a) is a half mountain part (7),
The said inner fin (33) of each step | paragraph is respectively comprised from the said peak part (6) of S pieces (S is a natural number), and one said half peak part (7). Or the laminated heat exchanger of 2. When the direction perpendicular to both the longitudinal direction of the flow pipe (3) and the stacking direction is the flow pipe width direction,
The top part (51) of the inner fin (33) is composed of two half top parts (51a), and the length of the half top part (51a) in the channel pipe width direction is the top part (51). ) Is half the length of the flow passage tube width direction,
The valley portion (52) of the inner fin (33) is composed of two half valley portions (52a), and the length of the half valley portion (52a) in the flow channel width direction is the valley portion. (52) is half the length of the flow channel tube width direction,
In the inner fin (33), one top part (51), two plate parts (331) connected to the top part (51), and each of the two plate parts (331) are connected. A part composed of the half valley part (52a) is a mountain part (6),
One said half top part (51a) in the said inner fin (33), one said board part (331) connected to the said half top part (51a), and the said half valley connected to the said board part (331) When the part composed of the part (52a) is a half mountain part (7),
The inner fins (33) are stacked in three stages in the stacking direction of the channel pipe (3) in the channel pipe (3),
The inner fin (33) at the first stage is composed of T pieces (T is an integer of 2 or more) of the peak portions (6).
The inner fin (33) of the second stage is composed of (T-1) pieces of the peak portions (6) and one piece of the half peak portion (7),
The third-stage inner fin (33) includes (T-1) the peak portions (6), one half peak portion (7), T peak portions (6) or (T-1). 3) The stacked heat exchanger according to claim 1 or 2, characterized in that the stacked heat exchanger is composed of a plurality of the peak portions (6). When the direction perpendicular to both the longitudinal direction of the flow pipe (3) and the stacking direction is the flow pipe width direction,
The top part (51) of the inner fin (33) is composed of two half top parts (51a), and the length of the half top part (51a) in the channel pipe width direction is the top part (51). ) Is half the length of the flow passage tube width direction,
The valley portion (52) of the inner fin (33) is composed of two half valley portions (52a), and the length of the half valley portion (52a) in the flow channel width direction is the valley portion. (52) is half the length of the flow channel tube width direction,
In the inner fin (33), one top part (51), two plate parts (331) connected to the top part (51), and each of the two plate parts (331) are connected. A part composed of the half valley part (52a) is a mountain part (6),
One said half top part (51a) in the said inner fin (33), one said board part (331) connected to the said half top part (51a), and the said half valley connected to the said board part (331) When the part composed of the part (52a) is a half mountain part (7),
The inner fins (33) are stacked in three stages in the stacking direction of the channel pipe (3) in the channel pipe (3),
The first and third inner fins (33) are each composed of U (U is a natural number) peak portions (6),
The said inner fin (33) of the 2nd step | stage is comprised from the said U-shaped peak part (6) and the said 1 half peak part (7), The Claim 1 or 2 characterized by the above-mentioned. Laminated heat exchanger.

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