JP6862773B2 - Heat exchanger - Google Patents

Description

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

Conventionally, as a heat exchanger of this type, 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-shaped members are laminated and arranged with a predetermined gap. Offset fins are arranged in the gaps between adjacent plate-shaped members. The gap between the adjacent plate-shaped members constitutes a refrigerant flow path through which the refrigerant flows and a cooling water flow path through which the cooling water flows. The refrigerant flow path and the cooling water flow path are alternately arranged in the stacking direction of the plate-shaped members. Of the plurality of plate-shaped members, the first end plate-shaped member arranged on one end side in the stacking direction is provided with a first joint forming a refrigerant inlet and a first cooling water pipe forming a cooling water outlet. Has been done. Of the plurality of plate-shaped members, the second end plate-shaped member arranged on the other end side in the stacking direction includes a second joint forming a refrigerant outlet and a second cooling water pipe forming a cooling water inlet. It is provided.

Japanese Unexamined Patent Publication No. 2015-59669

In a plate-laminated heat exchanger as in Patent Document 1, if there is an unbonded portion in the bonded portion of each plate-shaped member, the function as a heat exchanger is impaired due to internal leakage, external leakage, reduction in withstand voltage, and the like. There is a risk of Therefore, in such a heat exchanger, after its manufacture, a leak inspection of each flow path is performed by a helium leak inspection or the like.

Further, in a plate-laminated heat exchanger as in Patent Document 1, the first end plate-shaped member may be directly joined to a plate-shaped member adjacent thereto by brazing. In the case of such a configuration, the refrigerant inlet formed on the first end plate-shaped member and the refrigerant inlet formed on the plate-shaped member are communicated with each other. Further, the cooling water outlet formed on the first end plate-shaped member and the cooling water outlet formed on the plate-shaped member are communicated with each other. At this time, the refrigerant inlet of the first end plate-shaped member and the refrigerant inlet of the plate-shaped member are joined by burring joint.

By the way, the burring joint between the refrigerant inlet of the first end plate-shaped member and the refrigerant inlet of the plate-shaped member may not be properly performed for some reason. In a heat exchanger having such an unjoined portion, the refrigerant flow path and the cooling water channel are not communicated with each other. Therefore, even if the above leak inspection is performed, it is difficult to detect the unjoined portion. Then, when a heat exchanger having such an unjoined portion is actually used, there is a possibility that the refrigerant may enter between the first end plate-shaped member and the plate-shaped member. In this case, since the pressure receiving area of the first end plate-shaped member increases, there is a possibility that inconveniences such as deformation of the first end plate-shaped member and the plate-shaped member may occur.

The present disclosure has been made in view of these circumstances, and an object of the present disclosure is to provide a heat exchanger capable of more reliably detecting an unjoined portion during a leak inspection.

The heat exchanger (10) for solving the above problems is a plurality of inner plates arranged in a plurality of gaps formed between the plurality of outer plates (20) to be laminated and the outer plates adjacent to each other in the stacking direction. (30) and the outermost shell plate (60) joined to the outermost outer plate (20a) arranged at the outermost end in the stacking direction among the plurality of outer plates. The plurality of outer plates and the plurality of inner plates are formed by alternately partitioning the refrigerant flow path (W1) through which the refrigerant flows and the cooling water flow path (W2) through which the cooling water flows in the stacking direction. When one of the refrigerant flow path and the cooling water flow path is the first flow path and the other flow path is the second flow path, the outer plate communicates the first flow paths adjacent to each other in the stacking direction. A first communication hole (22a, 22b) is formed inside to communicate with a communication portion (24a, 24b) formed so as to project from the outer plate in a tubular shape, and a second flow path adjacent to each other in the stacking direction. It has two communication holes (23a, 23b). The outermost shell plate has joints (J1, J2) to which the outer peripheral surfaces of the communication portions of the outermost outer plate are 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 outer plate and the joint portion of the outermost shell plate are not joined, a leak inspection is performed to guide the fluid flowing through the first flow path. It flows to the second flow path through the passage. Therefore, since it is possible to detect a fluid leak during a leak inspection, it is possible to more reliably detect an unjoined portion.

The above means and the reference numerals in parentheses described in the claims are examples showing the correspondence with the specific means described in the embodiments described later.

According to the present disclosure, it is possible to provide a heat exchanger capable of more reliably detecting an unjoined portion during a leak inspection.

FIG. 1 is a front view showing the front structure of the heat exchanger of the embodiment. FIG. 2 is a perspective view showing an exploded perspective structure of the heat exchanger of the embodiment. FIG. 3 is a perspective view showing a perspective structure of the outermost outer plate and the first outermost shell plate of the embodiment. FIG. 4 is a plan view showing the plan structure of the outermost outer plate of the embodiment. FIG. 5 is a plan view showing the planar structure of the first outermost shell plate of the embodiment. FIG. 6 is a cross-sectional view showing a cross-sectional structure along the VI-VI line of 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 a first recess of the first outermost shell plate in a state where the outermost 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 portion when the joint portion of the outermost outer plate and the first outermost shell plate of the embodiment is in an unjoined state. FIG. 10 is a plan view showing the plan structure of the outermost outer plate of the other embodiment.

Hereinafter, an embodiment of the heat exchanger will be described with reference to the drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.
The 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 stacking a plurality of outer plates 20 in the directions indicated by arrows z1 and z2. Hereinafter, for convenience, the directions indicated by the arrows z1 and z2 are also referred to as "plate stacking directions z1 and z2". Further, the direction indicated by the arrow z1 is also referred to as "upward z1", and the direction indicated by the arrow z2 is also referred to as "downward 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 outer shell plate 60, and a second outermost plate. It includes 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 composed of a rectangular plate-shaped 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”.
An overhanging portion 21 projecting upward z1 is formed on the outer peripheral edge portion of the outer plate 20. The plurality of outer plates 20 are arranged so that the tip portions of the respective overhanging portions 21 face upward z1 and are laminated as shown in FIG. The overhanging 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 22a and a cooling water communication hole 23a 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 22a and 22b are arranged so as to face 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 directions 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 formed, respectively. The refrigerant communication portions 24a and 24b are formed so as to project downward from the bottom surface of the outer plate 20 in a tubular shape. The first refrigerant tank portion T11 shown in FIG. 1 is formed by communicating the refrigerant communication portions 24a of each outer plate 20 in the plate stacking directions z1 and z2. Further, the refrigerant communication portion 24b of each outer plate 20 is communicated in the plate stacking directions z1 and z2 to form the second refrigerant tank portion T12 shown in FIG.

As shown in FIGS. 3 and 4, the cooling water communication holes 23a and 23b are arranged in the outer plate 20 so as to face each other on a diagonal line different from the diagonal line in which the refrigerant communication holes 22a and 22b are arranged. The cooling water communication hole 23a is arranged at a position adjacent to the refrigerant communication hole 22a. The cooling water communication hole 23b is arranged 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 directions z1 and z2. The first cooling water tank portion T21 shown in FIG. 1 is formed by communicating the cooling water communication holes 23a of each outer plate 20 in the plate stacking directions z1 and z2. Further, the cooling water communication holes 23b of each outer plate 20 are communicated with each other in the plate stacking directions z1 and z2 to form the second cooling water tank portion T22 shown in FIG.

As shown in FIGS. 3 and 4, the refrigerant ribs 25a and 25b protruding upward z1 are formed in a part of the outer peripheral portions of the refrigerant communication holes 22a and 22b in the outer plate 20, respectively. The portions of the outer peripheral portions of the refrigerant communication holes 22a and 22b where the refrigerant ribs 25a and 25b are not formed are communication passages 26a and 26b that communicate the refrigerant communication holes 22a and the internal space of the outer plate 20.

Similarly, cooling water ribs 27a and 27b protruding upward z1 are formed on the outer peripheral portions of the cooling water communication holes 23a and 23b in the outer plate 20 over the entire circumference.
As shown in FIG. 2, the inner plate 30 is composed of a rectangular plate-shaped member having a longitudinal direction in the direction indicated by the arrow x. The plurality of inner plates 30 are arranged in gaps formed between the outer plates 20 and 20 adjacent to each other in the plate stacking directions z1 and z2, respectively. The inner plate 30 is joined to the adjacent outer plates 20 and 20 by brazing. The inner plate 30 divides the space formed between the adjacent outer plates 20 and 20 into the refrigerant flow path W1 and the 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, the refrigerant ribs 25a and 25b, and the cooling water ribs 27a and 27b on the upper surface of the outer plate 20 by brazing. As a result, the refrigerant flow path W1 is formed by the 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 via the communication passages 26a and 26b formed in the refrigerant ribs 25a and 25b, respectively.

The upper surface of the inner plate 30 is joined to the lower surface of the outer plate 20 by brazing. As a result, the cooling water flow path W2 is formed by the space surrounded by the upper surface of the inner plate 30 and the bottom surface of the outer plate 20. The cooling water flow path W2 communicates with the cooling water communication holes 23a and 23b of the outer plate 20, respectively.

As shown in FIG. 2, the refrigerant fins 40 are arranged in the refrigerant flow path W1 formed between the outer plate 20 and the inner plate 30. The cooling water fins 50 are arranged in the cooling water flow path W2 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 wavy shape can be used. The refrigerant fins 40 and the cooling water fins 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 composed of a rectangular plate-shaped 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 outer plate 20a arranged 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 outer plate 20a are also referred to as “joining surface 69” and “joining surface 28”, respectively.

An overhanging portion 61 projecting upward z1 is formed on the outer peripheral edge portion of the first outermost shell plate 60. Further, the first outermost shell plate 60 is formed with a first closed portion 62, a second closed portion 63, a refrigerant flow hole 64, and a cooling water flow hole 65.
The first closed portion 62 and the second closed portion 63 are formed in a concave shape so as to be recessed toward the lower z2.

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

The second closing portion 63 is arranged so as to face the cooling water communication hole 23a of the outer plate 20. The second closing portion 63 closes the cooling water communication hole 23a, in other words, closes one end of the lower z2 of the first cooling water tank portion T21.
The refrigerant flow hole 64 is arranged so as to face the refrigerant communication hole 22b of the outermost outer plate 20a. The refrigerant flow hole 64 penetrates the first outermost shell plate 60 in the plate stacking directions z1 and z2. As shown in FIG. 2, the first outermost shell plate 60 is formed with a tubular refrigerant flow portion 66 for projecting the refrigerant flow hole 64 downward z2. As shown in FIG. 6, the outer peripheral surface of the refrigerant communication portion 24b of the outermost outer plate 20a is burring-bonded to the inner peripheral surface of the refrigerant flow hole 64. As a result, the refrigerant flow hole 64 of the first outermost shell plate 60 is communicated with the refrigerant communication hole 22b of the outermost outer plate 20a. As described above, the inner peripheral surface of the refrigerant flow 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 outer plate 20a is joined.

As shown in FIGS. 3 and 5, the cooling water flow hole 65 is arranged so as to face the cooling water communication hole 23b of the outermost outer plate 20a. The cooling water flow hole 65 penetrates the first outermost shell plate 60 in the plate stacking directions z1 and z2. As shown in FIG. 2, the first outermost shell plate 60 is formed with a tubular cooling water flow section 67 for projecting the cooling water flow hole 65 downward z2. The cooling water flow unit 67 communicates with the cooling water communication hole 23b of the outermost outer plate 20a.

As shown in FIG. 7, the refrigerant flow section 66 is assembled with a refrigerant supply port 80 which is a portion for supplying the refrigerant to the second refrigerant tank section T12. The cooling water distribution section 67 is assembled with a cooling water discharge port 81 which is a portion for discharging cooling water from the second cooling water tank section T22.
As shown in FIG. 5, in the first outermost shell plate 60, a first recess 68a is formed between the refrigerant flow hole 64 and the cooling water flow hole 65 and adjacent to the overhanging portion 61. ing. Further, in FIG. 8, a second recess 68b is formed in the first outermost shell plate 60 at a portion between the first closing portion 62 and the second closing portion 63 and adjacent to the overhanging portion 61. As shown, the first recess 68a is formed so as to be 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. It is provided so as to communicate with the rib gap C12 formed between the cooling water rib 27b and the first outermost shell plate 60. As described above, in the heat exchanger 10 of the present embodiment, the rib gap C11, the first recess 68a, and the rib gap C12 are the outer peripheral surface of the refrigerant communication portion 24b of the outermost outer plate 20a and the first outermost shell plate. A conduction path L1 extending from the joint J1 with the inner peripheral surface of the refrigerant flow hole 64 of 60 to the cooling water communication hole 23b of the outermost outer plate 20a is formed.

As shown enlarged in FIG. 8, brazing filler fillets 90a and 90b are formed at the joint between the first outermost shell plate 60 and the outermost outer plate 20a in the first recess 68a. When the radius of curvature of the brazing filler metal fillet 90a is "r1" and the radius of curvature of the brazing filler metal fillet 90b is "r2", the first recess 68a has a virtual inscribed circle C having a radius R1 larger than the radius of curvature r1 and r2. Is formed to 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 between the refrigerant rib 25a and the first outermost shell plate 60 of the outermost outer plate 20a. The rib gap C21 formed is provided so as to communicate with the rib gap C22 formed between the cooling water rib 27a of the outermost outer plate 20a and the first outermost shell plate 60. As described above, 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 outer plate 20a and the first outermost shell plate. A conduction path L2 extending from the joint J2 with the inner peripheral surface of the first closed portion 62 of 60 to the cooling water communication hole 23a of the outermost outer plate 20a is formed.

As shown in FIG. 2, the second outermost shell plate 70 is joined to the outermost outer plate 20b arranged at the uppermost end of the plurality of outer plates 20 by brazing. Refrigerant fins 40 are arranged between the second outermost shell plate 70 and the outermost outer plate 20b. The second outermost shell plate 70 closes one end of the upper z1 of the second refrigerant tank portion T12 and one end of the upper z1 of the second cooling water tank portion T22 shown in FIG. Further, the second outermost shell plate 70 has a refrigerant discharge port 82 which is a portion for discharging the refrigerant from the first refrigerant tank portion T11 and cooling water which is a portion for supplying cooling water to the first cooling water tank portion T21. The 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 flow hole 64 of the first outermost shell plate 60. The refrigerant that has flowed into the refrigerant flow hole 64 of the first outermost shell plate 60 flows into the second refrigerant tank portion T12 through the refrigerant communication hole 22b of the outermost 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 to the first cooling water tank portion T21 from the cooling water supply port 83. 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. The refrigerant flowing through the refrigerant flow path W1 is cooled by 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 that has finished flowing through the refrigerant flow paths 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.
Further, the cooling water that has finished flowing through the cooling water flow paths W2 formed between the outer plate 20 and the inner plate 30 is collected in the second cooling water tank portion T22. The refrigerant collected in the second cooling water tank portion T22 is discharged from the cooling water discharge port 81 through the cooling water communication hole 23b of the outermost outer plate 20a and the cooling water flow hole 65 of the first outermost shell plate 60. Will be done.

By the way, when the outer peripheral surface of the refrigerant communication portion 24b of the outermost outer plate 20a is burring-bonded to the inner peripheral surface of the refrigerant flow hole 64 of the first outermost shell plate 60, as shown in FIG. It may be in an unjoined state. In this case, in the heat exchanger 10 of the present embodiment, as shown by the arrow M in FIG. 5, the refrigerant flow hole 64 of the first outermost shell plate 60 is the refrigerant communication portion 24b of the outermost outer plate 20a. From the gap of the unjoined portion between the outer peripheral surface and the inner peripheral surface of the refrigerant flow hole 64 of the first outermost shell plate 60, the outermost portion is passed through the rib gap C11, the first recess 68a, and the rib gap C12. It communicates with the cooling water communication hole 23b of the outer plate 20a. Therefore, at the time of leak inspection, the inspection fluid flows from the refrigerant communication hole 22b of the outermost outer plate 20a to the cooling water communication hole 23b. Therefore, since an abnormality is detected by the leak inspection, the joint portion J1 between the outer peripheral surface of the refrigerant communication portion 24b of the outermost outer plate 20a and the inner peripheral surface of the refrigerant flow hole 64 of the first outermost shell plate 60 is not yet formed. The joining state can be detected.

The rib gap C21, the second recess 68b, and the rib gap C22 allow the outer peripheral surface of the refrigerant communication portion 24a of the outermost outer plate 20a and the inner peripheral surface of the first closing portion 62 of the first outermost shell plate 60. The unjoined state at the joined portion J2 of the above can be detected.
According to the heat exchanger 10 of the present embodiment described above, the actions and effects shown in the following (1) to (3) can be obtained.

(1) The heat exchanger 10 is the outermost portion from the joint portion J1 between the outer peripheral surface of the refrigerant communication portion 24b of the outermost outer plate 20a and the inner peripheral surface of the refrigerant flow 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 is the outermost portion from the joint portion J2 between the outer peripheral surface of the refrigerant communication portion 24a of the outermost outer plate 20a and the inner peripheral surface of the first closed 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. As a result, the leak of the inspection fluid can be detected at the time of the leak inspection, so that the unjoined portion can be detected more reliably.

(2) The conduction paths L1 and L2 are each composed of a first recess 68a and a second recess 68b formed in the first outermost shell plate 60. As a result, the conduction paths L1 and L2 can be formed only by providing the first recess 68a and the second recess 68b on the first outermost shell plate 60 by embossing or the like, so that the conduction paths L1 and L2 can be easily formed. Become.

(3) The first recess 68a has a size capable of inserting a virtual inscribed circle C having a radius R1 larger than the respective radius of curvature r1 and r2 of the brazing filler fillets 90a and 90b formed in the first recess 68a. It is formed. The same applies to the second recess 68b. As a result, it is possible to prevent the first recess 68a and the second recess 68b from being filled with the brazing material, so that the functions of the conduction paths L1 and L2 can be more reliably ensured.

The above embodiment can also be implemented in the following embodiments.
As shown in FIG. 10, instead of the first recess 68a and the second recess 68b of the first outermost shell plate 60, the first recess 29a and the second recess 29b are formed on the outermost outer plate 20a. May be 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 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 and the cooling water rib 27a. Even with such a configuration, it is possible to obtain an action and effect similar to those of the above embodiment.

-The flow direction of the refrigerant and the flow direction of the cooling water in the heat exchanger 10 can be changed as appropriate. Further, the flow path of the refrigerant and the flow path of the cooling water in the heat exchanger 10 may be reversed.
-The heat exchanger 10 of the embodiment can be used not only for a water-cooled condenser for a vehicle or an oil cooler but also for an appropriate device.

-The present disclosure is not limited to the above specific examples. Specific examples described above with appropriate design changes 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 above-mentioned specific examples, and their arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

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 parts 28, 69: Joint surface 30: Inner plate 60: Outermost shell plates 68a, 68b, 29a, 29b: Recesses J1, J2: Joint parts L1, L2: Conduction path W1: Refrigerant flow path W2 : Cooling water flow path

Claims (4)

Multiple outer plates (20) to be laminated and
A plurality of inner plates (30) arranged in a plurality of gaps formed between the outer plates adjacent to each other in the stacking direction, and
Among the plurality of outer plates, the outermost shell plate (60) joined to the outermost outer plate (20a) arranged at the outermost portion in the stacking direction is provided.
The plurality of outer plates and the plurality of inner plates are formed by alternately partitioning 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 flow path and the cooling water flow path is the first flow path and the other flow path is the second flow path,
The outer plate has a communication portion in which first communication holes (22a, 22b) for communicating the first flow paths adjacent to each other in the stacking direction are formed inside so as to project from the outer plate in a tubular shape. (24a, 24b) and second communication holes (23a, 23b) for communicating the second flow paths adjacent to each other in the stacking direction.
The outermost shell plate has joints (J1, J2) to which the outer peripheral surfaces of the communication portions of the outermost outer plate are joined.
A heat exchanger provided with conduction paths (L1, L2) extending from the joint to the second communication hole.
The heat exchanger according to claim 1, wherein the conduction path is composed of recesses (68a, 68b) formed in a joint surface (69) to which the outermost outer plate is joined in the outermost shell plate. .. The heat exchanger according to claim 1, wherein the conduction path is composed of recesses (29a, 29b) formed in a joint surface (28) to which the outermost shell plate is joined in the outermost 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 the radius of curvature of the brazing filler fillet formed in the recess can be inserted.

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