JP2018076984A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of detecting an unjoined part more surely in a leakage inspection.SOLUTION: A heat exchanger includes: a plurality of outer plates which are laminated; a plurality of inner plates arranged respectively in a plurality of gaps formed between outer plates adjacent to each other in the lamination direction; and an outermost shell plate 60 joined to an outermost end part outer plate 20a arranged at the outermost end part in the lamination direction out of the plurality of inner plates. The outer plate includes: refrigerant communication parts 24a, 24b in which the refrigerant communication holes 22a, 22b are formed inside and which are formed so as to protrude from the outer plate 20 in a cylindrical manner; and cooling water communication holes 23a, 23b. The outermost shell plate 60 has joined parts J1, J2 with which outer peripheral surfaces of the refrigerant communication parts 24a, 24b of the outermost end part outer plate 20a are joined. The heat exchanger 10 includes conduction passages L1, L2 extending to the cooling water communication holes 23a, 23b from the joined parts J1, J2.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to a heat exchanger configured by a laminated structure of plates.

  Conventionally, as this type of heat exchanger, there is a heat exchanger described in Patent Document 1. The heat exchanger described in Patent Document 1 has a structure in which a plurality of plate-like members are stacked and arranged with a predetermined gap therebetween. Offset fins are arranged in the gaps between adjacent plate-like members. A gap between adjacent plate-like members constitutes a coolant channel through which a coolant flows and a cooling water channel through which cooling water flows. The refrigerant channel and the cooling water channel are alternately arranged in the stacking direction of the plate-like members. Among the plurality of plate-like members, the first end plate-like member arranged on one end side in the stacking direction is provided with a first joint that constitutes a refrigerant inlet and a first cooling water pipe that constitutes a cooling water outlet. It has been. Among the plurality of plate-like members, the second outermost plate-like member disposed on the other end side in the stacking direction includes a second joint that constitutes a refrigerant outlet and a second cooling water pipe that constitutes a cooling water inlet. Is provided.

Japanese Patent Laying-Open No. 2015-59669

  In the plate-stacked heat exchanger as in Patent Document 1, if there is an unjoined portion in the joined portion of each plate-like member, the function as a heat exchanger is impaired, such as internal leakage, external leakage, and reduced pressure resistance. There is a risk of being. Therefore, in such a heat exchanger, after manufacturing, a leak inspection of each flow path is performed by a helium leak inspection or the like.

  Moreover, in the plate stacking type heat exchanger as in Patent Document 1, the first endmost plate member may be directly joined to a plate member adjacent thereto by brazing. In the case of such a configuration, the refrigerant inlet formed in the first end plate member and the refrigerant inlet formed in the plate member communicate with each other. Moreover, the cooling water outlet formed in the 1st endmost plate-shaped member and the cooling water outlet formed in the plate-shaped member are connected. At this time, the refrigerant inlet of the first end plate member and the refrigerant inlet of the plate member are joined by burring joining.

  By the way, burring joining between the refrigerant inlet of the first endmost plate member and the refrigerant inlet of the plate member may not be appropriately performed for some reason. In the heat exchanger having such an unjoined portion, the refrigerant channel and the cooling water channel are not communicated. Therefore, it is difficult to detect an unjoined portion even if the above leakage inspection is performed. And when the heat exchanger which has such an unjoined part is actually used, a refrigerant | coolant may approach between a 1st endmost plate-shaped member and a plate-shaped member. In this case, since the pressure receiving area of the first endmost plate-like member increases, there is a possibility that inconveniences such as deformation of the first endmost plate-like member and the plate-like member may occur.

  This indication is made in view of such a situation, and the object is to provide the heat exchanger which can detect an unjoined part more certainly in the case of a leak inspection.

  The heat exchanger (10) that solves the above problems includes a plurality of outer plates (20) that are stacked and a plurality of inner plates that are respectively disposed in a plurality of gaps that are formed between outer plates that are adjacent in the stacking direction. (30) and an outermost shell plate (60) joined to the outermost end outer plate (20a) disposed at the outermost end in the stacking direction among the plurality of inner plates. The plurality of outer plates and the plurality of inner plates are formed by alternately dividing a refrigerant flow path (W1) through which refrigerant flows and a cooling water flow path (W2) through which cooling water flows in the stacking direction. When one of the refrigerant flow channel and the cooling water flow channel is the first flow channel and the other flow channel is the second flow channel, the outer plate connects the first flow channels adjacent in the stacking direction. The first communication holes (22a, 22b) are formed in the interior and the communication portions (24a, 24b) formed so as to protrude in a cylindrical shape from the outer plate communicate with the second flow paths adjacent in the stacking direction. 2 communication holes (23a, 23b). The outermost shell plate has joint portions (J1, J2) to which the outer peripheral surface of the communication portion of the outermost end outer plate is joined. The heat exchanger (10) includes conduction paths (L1, L2) extending from the joint to the second communication hole.

  According to this configuration, if the outer peripheral surface of the communication portion of the outermost end outer plate and the joint portion of the outermost shell plate are in an unjoined state, the fluid flowing through the first flow path is introduced when a leak inspection is performed. It flows to the 2nd channel through a passage. Therefore, it is possible to detect the leakage of the fluid during the leak inspection, and thus it is possible to detect the unjoined portion more reliably.

  In addition, the code | symbol in the bracket | parenthesis as described in the said means and a claim is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  According to the present disclosure, it is possible to provide a heat exchanger that can more reliably detect an unjoined portion during a leak inspection.

Drawing 1 is a front view showing the front structure of the heat exchanger of an embodiment. FIG. 2 is a perspective view illustrating an exploded perspective structure of the heat exchanger according to the embodiment. FIG. 3 is a perspective view showing a perspective structure of the outermost end outer plate and the first outermost shell plate of the embodiment. FIG. 4 is a plan view showing a planar structure of the outermost end outer plate of the embodiment. FIG. 5 is a plan view showing a planar structure of the first outermost shell plate of the embodiment. 6 is a cross-sectional view showing a cross-sectional structure taken along line VI-VI in FIG. FIG. 7 is a bottom view showing the bottom structure of the first outermost shell plate of the embodiment. FIG. 8 is a cross-sectional view showing an enlarged cross-sectional structure around the first recess of the first outermost shell plate in a state in which the outermost end outer plate and the first outermost shell plate of the embodiment are joined. FIG. 9 is a cross-sectional view showing an enlarged cross-sectional structure around the joint when the joint between the outermost outer plate and the first outermost plate of the embodiment is in an unjoined state. FIG. 10 is a plan view showing a planar structure of the outermost end outer plate of another embodiment.

Hereinafter, an embodiment of a heat exchanger will be described with reference to the drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.
A heat exchanger 10 shown in FIG. 1 is applied to a water-cooled condenser or an oil cooler for a vehicle. The heat exchanger 10 is formed by laminating a plurality of outer plates 20 in the directions indicated by arrows z1 and z2. Hereinafter, for the sake of convenience, the directions indicated by the arrows z1 and z2 are also referred to as “plate stacking directions z1 and z2”. The direction indicated by the arrow z1 is also referred to as “upper z1”, and the direction indicated by the arrow z2 is also referred to as “lower z2”.

  As shown in FIG. 2, the heat exchanger 10 includes an outer plate 20, an inner plate 30, a refrigerant fin 40, a cooling water fin 50, a first outermost shell plate 60, and a second outermost plate. And a shell plate 70. The heat exchanger 10 is made of a metal material such as aluminum.

As shown in FIGS. 1 and 2, the outer plate 20 is made of a rectangular plate-like member having a longitudinal direction in the direction indicated by the arrow x. Hereinafter, the direction indicated by the arrow x is also referred to as “plate longitudinal direction x”.
On the outer peripheral edge portion of the outer plate 20, an overhang portion 21 protruding upward z1 is formed. The plurality of outer plates 20 are arranged so that the tip portions of the respective overhang portions 21 face upward z1 and are stacked as shown in FIG. The overhang portions 21 of the plurality of outer plates 20 are joined to each other by brazing.

  As shown in FIGS. 3 and 4, a refrigerant communication hole 22 a and a cooling water communication hole 23 a are formed at one end of the outer plate 20 in the plate longitudinal direction x. A refrigerant communication hole 22b and a cooling water communication hole 23b are formed at the other end of the outer plate 20 in the plate longitudinal direction x. In the present embodiment, the refrigerant communication holes 22a and 22b correspond to the first communication holes. Further, the cooling water communication holes 23a and 23b correspond to the second communication holes.

  The refrigerant communication holes 22 a and 22 b are arranged opposite to each other on the diagonal line of the outer plate 20. The refrigerant communication holes 22a and 22b penetrate the outer plate 20 in the plate stacking direction z1 and z2. As shown in FIG. 2, the outer plate 20 has refrigerant communication portions 24a and 24b in which refrigerant communication holes 22a and 22b are respectively formed. The refrigerant communication portions 24 a and 24 b are formed so as to protrude in a cylindrical shape from the bottom surface of the outer plate 20 downward. The first refrigerant tank portion T11 shown in FIG. 1 is formed by the refrigerant communication portions 24a of the outer plates 20 being communicated in the plate stacking directions z1 and z2. Moreover, the 2nd refrigerant | coolant tank part T12 shown by FIG. 1 is formed because the refrigerant | coolant communication part 24b of each outer plate 20 is connected to plate lamination direction z1, z2.

  As shown in FIGS. 3 and 4, the cooling water communication holes 23 a and 23 b are arranged on a diagonal line different from the diagonal line in which the refrigerant communication holes 22 a and 22 b are arranged in the outer plate 20. The cooling water communication hole 23a is disposed at a position adjacent to the refrigerant communication hole 22a. The cooling water communication hole 23b is disposed at a position adjacent to the refrigerant communication hole 22b. The cooling water communication holes 23a and 23b penetrate the outer plate 20 in the plate stacking direction z1 and z2. The cooling water communication hole 23a of each outer plate 20 is communicated in the plate stacking direction z1, z2, thereby forming the first cooling water tank portion T21 shown in FIG. Moreover, the 2nd cooling water tank part T22 shown by FIG. 1 is formed by the cooling water communication hole 23b of each outer plate 20 being connected to plate lamination direction z1, z2.

  As shown in FIGS. 3 and 4, refrigerant ribs 25 a and 25 b projecting upward z <b> 1 are respectively formed on part of the outer peripheral portions of the refrigerant communication holes 22 a and 22 b in the outer plate 20. Portions where the refrigerant ribs 25a and 25b are not formed in the outer peripheral portions of the refrigerant communication holes 22a and 22b serve as communication passages 26a and 26b that connect the refrigerant communication hole 22a and the inner space of the outer plate 20.

Similarly, cooling water ribs 27a and 27b projecting upward z1 are formed on the outer peripheral portions of the cooling water communication holes 23a and 23b in the outer plate 20, respectively.
As shown in FIG. 2, the inner plate 30 is made of a rectangular plate-like member having a longitudinal direction in the direction indicated by the arrow x. The plurality of inner plates 30 are respectively disposed in gaps formed between the outer plates 20 and 20 adjacent in the plate stacking direction z1 and z2. The inner plate 30 is joined to the adjacent outer plates 20 and 20 by brazing. The inner plate 30 partitions a space formed between the adjacent outer plates 20 and 20 into a refrigerant flow path W1 and a cooling water flow path W2. Therefore, in the heat exchanger 10, the refrigerant flow paths W1 and the cooling water flow paths W2 are alternately arranged in the plate stacking directions z1 and z2. The refrigerant flow path W1 and the cooling water flow path W2 are independent flow paths that are not communicated with each other. In the present embodiment, the refrigerant flow path W1 corresponds to the first flow path, and the cooling water flow path W2 corresponds to the second flow path.

  Specifically, the bottom surface of the inner plate 30 is joined to the overhanging portion 21 on the upper surface of the outer plate 20, the refrigerant ribs 25 a and 25 b, and the cooling water ribs 27 a and 27 b by brazing. Thereby, the refrigerant flow path W <b> 1 is formed by a space surrounded by the upper surface of the outer plate 20 and the bottom surface of the inner plate 30. The refrigerant flow path W1 communicates with the refrigerant communication holes 22a and 22b of the outer plate 20 through communication paths 26a and 26b formed in the refrigerant ribs 25a and 25b, respectively.

  The upper surface of the inner plate 30 is joined to the bottom surface of the outer plate 20 by brazing. Thereby, the cooling water flow path W <b> 2 is formed by a space surrounded by the upper surface of the inner plate 30 and the bottom surface of the outer plate 20. This cooling water flow path W2 is connected to the cooling water communication holes 23a and 23b of the outer plate 20, respectively.

  As shown in FIG. 2, the refrigerant fin 40 is disposed in a refrigerant flow path W <b> 1 formed between the outer plate 20 and the inner plate 30. The cooling water fins 50 are disposed in a cooling water flow path W <b> 2 formed between the outer plate 20 and the inner plate 30. As the refrigerant fin 40 and the cooling water fin 50, for example, corrugated fins formed in a wave shape can be used. The refrigerant fin 40 and the cooling water fin 50 have a function of improving the heat exchange performance of the heat exchanger 10 by increasing the heat transfer area.

  As shown in FIGS. 3 and 5, the first outermost shell plate 60 is formed of a rectangular plate-like member having a longitudinal direction in the direction indicated by the arrow x. The upper surface 69 of the first outermost shell plate 60 is joined to the bottom surface 28 of the outermost end outer plate 20a disposed at the outermost end of the lower z2 among the plurality of outer plates 20 by brazing. Hereinafter, the upper surface 69 of the first outermost shell plate 60 and the bottom surface 28 of the outermost end outer plate 20a are also referred to as “joining surface 69” and “joining surface 28”, respectively.

On the outer peripheral edge portion of the first outermost shell plate 60, an overhang portion 61 protruding upward z1 is formed. Further, the first outermost shell plate 60 is formed with a first closing portion 62, a second closing portion 63, a refrigerant circulation hole 64, and a cooling water circulation hole 65.
The first closing part 62 and the second closing part 63 are formed in a concave shape so as to be recessed toward the lower z2.

  The first closing portion 62 is disposed to face the refrigerant communication hole 22a of the outer plate 20. The inner peripheral surface of the first closing portion 62 is a joint portion J2 where the outer peripheral surface of the refrigerant communication portion 24a of the outermost end outer plate 20a is joined by brazing. The first closing portion 62 closes the refrigerant communication hole 22a, in other words, closes one end portion of the lower z2 of the first refrigerant tank portion T11.

The second closing portion 63 is disposed to face the cooling water communication hole 23 a of the outer plate 20. The second closing portion 63 closes the cooling water communication hole 23a, in other words, closes one end portion of the lower z2 of the first cooling water tank portion T21.
The refrigerant circulation hole 64 is disposed to face the refrigerant communication hole 22b of the outermost end outer plate 20a. The coolant circulation hole 64 passes through the first outermost shell plate 60 in the plate stacking direction z1, z2. As shown in FIG. 2, the first outermost shell plate 60 is formed with a cylindrical refrigerant circulation portion 66 for causing the refrigerant circulation hole 64 to protrude downward z2. As shown in FIG. 6, the outer peripheral surface of the refrigerant communication portion 24b of the outermost end outer plate 20a is burring joined to the inner peripheral surface of the refrigerant circulation hole 64. Thereby, the refrigerant | coolant circulation hole 64 of the 1st outermost shell plate 60 is connected with the refrigerant | coolant communication hole 22b of the outermost edge part outer plate 20a. Thus, the inner peripheral surface of the refrigerant circulation hole 64 of the first outermost shell plate 60 is a joint portion J1 to which the outer peripheral surface of the refrigerant communication portion 24b of the outermost end outer plate 20a is joined.

  As shown in FIGS. 3 and 5, the cooling water circulation hole 65 is disposed to face the cooling water communication hole 23 b of the outermost end outer plate 20 a. The cooling water circulation hole 65 penetrates the first outermost shell plate 60 in the plate stacking direction z1, z2. As shown in FIG. 2, the first outermost shell plate 60 is formed with a cylindrical cooling water circulation portion 67 for causing the cooling water circulation hole 65 to protrude downward z2. The cooling water circulation part 67 is communicated with the cooling water communication hole 23b of the outermost end outer plate 20a.

As shown in FIG. 7, the refrigerant circulation part 66 is assembled with a refrigerant supply port 80 that serves as a part for supplying the refrigerant to the second refrigerant tank part T12. The cooling water circulation part 67 is assembled with a cooling water discharge port 81 serving as a part for discharging cooling water from the second cooling water tank part T22.
As shown in FIG. 5, the first outermost shell plate 60 has a first recess 68 a formed between the refrigerant circulation hole 64 and the cooling water circulation hole 65 and adjacent to the protruding portion 61. ing. Further, the first outermost shell plate 60 is formed with a second recess 68b between the first closing portion 62 and the second closing portion 63 and adjacent to the protruding portion 61. FIG. As shown, the first recess 68a is formed in a shape that is recessed downward z2 at the joint surface 69 of the first outermost shell plate 60. As shown in FIG. 5, the first recess 68a includes a rib gap C11 formed between the refrigerant rib 25b of the outermost outer plate 20a and the first outermost shell plate 60, and the outermost outer plate 20a. The ribs Cb formed between the cooling water ribs 27b and the first outermost shell plate 60 are provided so as to communicate with each other. Thus, in the heat exchanger 10 of the present embodiment, the rib gap C11, the first recess 68a, and the rib gap C12 are formed so that the outer peripheral surface of the refrigerant communication portion 24b of the outermost end outer plate 20a and the first outermost shell plate. A conduction path L1 extending from the joint portion J1 with the inner peripheral surface of the 60 refrigerant circulation holes 64 to the cooling water communication hole 23b of the outermost end outer plate 20a is configured.

  As shown in an enlarged view in FIG. 8, brazing filler fillets 90a and 90b are formed at the joint between the first outermost shell plate 60 and the outermost end outer plate 20a in the first recess 68a. When the curvature radius of the brazing filler fillet 90a is “r1” and the curvature radius of the brazing filler fillet 90b is “r2”, the first recess 68a has a virtual inscribed circle C having a radius R1 larger than the curvature radii r1 and r2. It is formed in a size that can be inserted.

  As shown in FIG. 5, the second recess 68b has the same shape as the first recess 68a, and is located between the refrigerant rib 25a of the outermost end outer plate 20a and the first outermost shell plate 60. The rib gap C21 is formed so as to communicate with the rib gap C22 formed between the cooling water rib 27a of the outermost end outer plate 20a and the first outermost shell plate 60. Thus, in the heat exchanger 10 of the present embodiment, the rib gap C21, the second recess 68b, and the rib gap C22 are the outer peripheral surface of the refrigerant communication portion 24a of the outermost end outer plate 20a and the first outermost shell plate. A conduction path L2 extending from the joint portion J2 with the inner peripheral surface of the first closed portion 62 of the 60 to the cooling water communication hole 23a of the outermost end outer plate 20a is configured.

  As shown in FIG. 2, the second outermost shell plate 70 is joined to the outermost end outer plate 20 b disposed at the uppermost end of the plurality of outer plates 20 by brazing. A refrigerant fin 40 is disposed between the second outermost shell plate 70 and the outermost end outer plate 20b. The second outermost shell plate 70 closes one end portion of the upper z1 of the second refrigerant tank portion T12 shown in FIG. 1 and one end portion of the upper z1 of the second cooling water tank portion T22. Further, the second outermost shell plate 70 has a coolant discharge port 82 that serves as a portion for discharging the coolant from the first coolant tank portion T11, and a coolant that serves as a portion for supplying coolant to the first coolant tank portion T21. A supply port 83 is assembled.

Next, an operation example of the heat exchanger 10 of the present embodiment will be described.
In the heat exchanger 10, the refrigerant flows from the refrigerant supply port 80 into the refrigerant circulation hole 64 of the first outermost shell plate 60. The refrigerant that has flowed into the refrigerant circulation hole 64 of the first outermost shell plate 60 flows into the second refrigerant tank T12 through the refrigerant communication hole 22b of the outermost end outer plate 20a. The refrigerant that has flowed into the second refrigerant tank portion T12 is distributed to the refrigerant flow paths W1 formed between the outer plate 20 and the inner plate 30, respectively.

  On the other hand, cooling water is supplied from the cooling water supply port 83 to the first cooling water tank T21. The cooling water that has flowed into the first cooling water tank portion T21 is distributed to the cooling water flow paths W2 formed between the outer plate 20 and the inner plate 30, respectively. By performing heat exchange between the cooling water flowing through the cooling water flow path W2 and the refrigerant flowing through the refrigerant flow path W1, the refrigerant flowing through the refrigerant flow path W1 is cooled.

The refrigerant that has finished flowing through the refrigerant flow path W1 formed between the outer plate 20 and the inner plate 30 is collected in the first refrigerant tank portion T11. The refrigerant collected in the first refrigerant tank portion T11 is discharged from the refrigerant discharge port 82.
The cooling water that has finished flowing through the cooling water flow path W2 formed between the outer plate 20 and the inner plate 30 is collected in the second cooling water tank T22. The refrigerant collected in the second cooling water tank T22 is discharged from the cooling water discharge port 81 through the cooling water communication hole 23b of the outermost end outer plate 20a and the cooling water circulation hole 65 of the first outermost shell plate 60. Is done.

  By the way, when the outer peripheral surface of the refrigerant communication portion 24b of the outermost end outer plate 20a is burring joined to the inner peripheral surface of the refrigerant flow hole 64 of the first outermost shell plate 60, as shown in FIG. There may be an unbonded state. In this case, in the heat exchanger 10 of the present embodiment, as indicated by an arrow M in FIG. 5, the refrigerant circulation hole 64 of the first outermost shell plate 60 is connected to the refrigerant communication portion 24b of the outermost end outer plate 20a. From the gap of the non-joined portion between the outer peripheral surface and the inner peripheral surface of the refrigerant circulation hole 64 of the first outermost shell plate 60, the endmost portion via the rib gap C11, the first recess 68a, and the rib gap C12. The outer plate 20a communicates with the cooling water communication hole 23b. Therefore, at the time of leak inspection, the inspection fluid flows from the refrigerant communication hole 22b of the outermost end outer plate 20a to the cooling water communication hole 23b. Therefore, since an abnormality is detected by the leak inspection, the outer peripheral surface of the refrigerant communication portion 24b of the outermost end outer plate 20a and the inner peripheral surface of the refrigerant circulation hole 64 of the first outermost shell plate 60 are not yet connected. The joining state can be detected.

The outer peripheral surface of the refrigerant communication portion 24a of the outermost end outer plate 20a and the inner peripheral surface of the first closing portion 62 of the first outermost shell plate 60 are defined by the rib clearance C21, the second recess 68b, and the rib clearance C22. It is possible to detect an unjoined state at the joint J2.
According to the heat exchanger 10 of this embodiment demonstrated above, the effect | action and effect shown by the following (1)-(3) can be acquired.

  (1) The heat exchanger 10 has an outermost end outer portion from a joint portion J1 between the outer peripheral surface of the refrigerant communication portion 24b of the outermost end outer plate 20a and the inner peripheral surface of the refrigerant circulation portion 66 of the first outermost shell plate 60. A conduction path L1 extending to the cooling water communication hole 23b of the plate 20a is provided. Further, the heat exchanger 10 has an outermost end outer portion from a joint portion J2 between the outer peripheral surface of the refrigerant communication portion 24a of the outermost end portion outer plate 20a and the inner peripheral surface of the first closing portion 62 of the first outermost shell plate 60. A conduction path L2 extending to the cooling water communication hole 23a of the plate 20a is provided. Thereby, since the leak of the fluid for a test | inspection can be detected in the case of a leak test | inspection, an unjoined part can be detected more reliably.

  (2) The conduction paths L1 and L2 are respectively configured by a first recess 68a and a second recess 68b formed in the first outermost shell plate 60. Thereby, since the conduction paths L1 and L2 can be formed only by providing the first recess 68a and the second recess 68b in the first outermost shell plate 60 by punching or the like, it is easy to form the conduction paths L1 and L2. Become.

  (3) The first recess 68a is sized so that a virtual inscribed circle C having a radius R1 larger than the respective curvature radii r1 and r2 of the brazing filler fillets 90a and 90b formed in the first recess 68a can be inserted. Is formed. The same applies to the second recess 68b. Thereby, since it can avoid that the 1st recessed part 68a and the 2nd recessed part 68b are filled with brazing | wax material, the function of said conduction path L1, L2 can be ensured more reliably.

In addition, the said embodiment can also be implemented with the following forms.
As shown in FIG. 10, instead of the first concave portion 68a and the second concave portion 68b of the first outermost shell plate 60, the first concave portion 29a and the second concave portion 29b are formed in the outermost end outer plate 20a. Also good. The first recess 29a and the second recess 29b are formed by cutting or the like so as to be recessed upward z1 on the bottom surface 28 of the outermost end outer plate 20a. The first recess 29a communicates the refrigerant rib 25b and the cooling water rib 27b. The second recess 29b communicates the refrigerant rib 25a with the cooling water rib 27a. Even with such a configuration, it is possible to obtain operations and effects similar to those of the above-described embodiment.

-The flow direction of the refrigerant | coolant in the heat exchanger 10 and the flow direction of cooling water can be changed suitably. Further, the flow path through which the refrigerant flows and the flow path through which the cooling water flows in the heat exchanger 10 may be reversed.
-The heat exchanger 10 of embodiment is not restricted to the water-cooled condenser and oil cooler for vehicles, It can be used for appropriate apparatuses.

  -This indication is not limited to said specific example. Any of the above specific examples that are appropriately modified by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the specific examples described above, and the arrangement, conditions, shape, and the like thereof are not limited to those illustrated, and can be appropriately changed. Each element included in each of the specific examples described above can be appropriately combined as long as no technical contradiction occurs.

10: Heat exchanger 20: Outer plates 22a, 22b: Refrigerant communication hole (first communication hole)
23a, 23b: Cooling water communication hole (second communication hole)
24a, 24b: Refrigerant communication portion 28, 69: Joint surface 30: Inner plate 60: Outermost shell plate 68a, 68b, 29a, 29b: Recessed portion J1, J2: Joint portion L1, L2: Conduction path W1: Refrigerant flow path W2 : Cooling water flow path

Claims (4)

A plurality of laminated outer plates (20);
A plurality of inner plates (30) respectively disposed in a plurality of gaps formed between the outer plates adjacent in the stacking direction;
Among the plurality of inner plates, the outermost shell plate (60) joined to the outermost end outer plate (20a) disposed at the outermost end in the stacking direction,
The plurality of outer plates and the plurality of inner plates are formed by alternately dividing a refrigerant flow path (W1) through which a refrigerant flows and a cooling water flow path (W2) through which cooling water flows, in the stacking direction,
When one of the refrigerant channel and the cooling water channel is a first channel and the other channel is a second channel,
The outer plate has a first communication hole (22a, 22b) that communicates with the first flow path adjacent in the stacking direction, and is formed so as to protrude from the outer plate in a cylindrical shape. (24a, 24b) and second communication holes (23a, 23b) for communicating the second flow paths adjacent in the stacking direction,
The outermost shell plate has a joint portion (J1, J2) to which an outer peripheral surface of the communication portion of the outermost end outer plate is joined.
A heat exchanger comprising conduction paths (L1, L2) extending from the joint to the second communication hole. 2. The heat exchanger according to claim 1, wherein the conduction path includes a recess (68 a, 68 b) formed in a joint surface (69) to which the outermost outer plate is joined in the outermost shell plate. . 2. The heat exchanger according to claim 1, wherein the conduction path includes a concave portion (29 a, 29 b) formed in a joint surface (28) to which the outermost shell plate is joined in the outermost end outer plate. . The heat exchanger according to claim 2 or 3, wherein the recess has a size into which a virtual inscribed circle having a radius larger than a curvature radius of a brazing filler fillet formed in the recess can be inserted.

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