JP7057654B2 - Oil cooler - Google Patents

Description

The present invention relates to a so-called multi-plate laminated oil cooler used for cooling, for example, lubricating oil for an internal combustion engine or hydraulic oil for an automatic transmission.

In recent years, in automobiles, in addition to the heat exchanger of oil for engines, the heat exchanger of oil for transmissions, and the heat exchanger of oil for cooling motors in hybrid vehicles, etc., are used in one vehicle to cool various oils. Many heat exchangers may be used.

Further, from the viewpoint of effective use of heat, various heat exchangers are often installed, such as having a multi-system circuit even in one medium.

For example, Patent Document 1 describes two types of cooled media and one type of refrigerant in a plate laminate as a heat exchange section for the purpose of improving mountability such as simplification of oil piping and effective use of space. A heat exchanger that exchanges heat between them is disclosed.

In the heat exchanger of Patent Document 1, a first fluid passage through which the refrigerant flows and a second fluid passage and a third fluid passage through which the cooled medium flows independently of each other are formed in the plate stack. The second fluid passage is formed on the upper layer side of the plate laminate. The third fluid passage is formed on the lower layer side of the plate laminate.

The refrigerant introduced into the plate laminate flows along the stacking direction of the plate laminate (the direction in which the plates are stacked), then changes the direction of the flow in the direction orthogonal to the stacking direction of the plate laminate, and then changes the direction of the flow. Flows along the stacking direction of the plate and is discharged from the plate laminate. That is, the first fluid passage has a plurality of upper layer side passage portions that branch within the plate stack and exchange heat with the second fluid passage on the upper layer side, and a plurality of lower layers that exchange heat with the third fluid passage on the lower layer side. The side passage portion and the side passage portion are connected in parallel.

Japanese Unexamined Patent Publication No. 62-20299

However, in a heat exchanger as disclosed in Patent Document 1 that forms a fluid passage between the plates of the plate laminate, one system of cooling medium flow path and two systems of cooled medium flow in the plate laminate. It is necessary to form the flow path independently of each other, and there is a possibility that the flow path configuration formed in the plate laminate is restricted.

Further, in the conventional heat exchanger disclosed in Patent Document 1, when the amount of heat exchanged is increased, the number of plates to be laminated is increased. However, as the number of plates to be stacked increases, the pressure loss decreases and the flow velocity of the fluid flowing between the plates decreases. Therefore, even if the number of plates to be stacked is increased, the effect of increasing the amount of exchange heat corresponding to the number is expected. You can't.

As described above, in the conventional heat exchanger, there is room for further improvement in improving the degree of freedom in setting the flow path configuration inside the heat exchanger and improving the heat exchange efficiency.

In the present invention, the first oil is introduced in an oil cooler having a heat exchange section in which a large number of core plates are laminated and an inter-plate oil flow path and an inter-plate refrigerant flow path are alternately configured between each. The first oil introduction port, the first oil discharge port from which the first oil is discharged, the second oil introduction port into which the second oil is introduced, and the second oil from which the second oil is discharged are discharged. The discharge port, the refrigerant introduction port into which the refrigerant is introduced, the refrigerant discharge port from which the refrigerant is discharged, the fluid passage penetrating the heat exchange section in the core plate stacking direction, and the core plate stacking direction of the heat exchange section. It has an intermediate plate sandwiched between the core plates at an intermediate position of the above, and a fin plate arranged in the inter-plate oil flow path . The first oil passage from the first oil introduction port to the first oil discharge port is formed by the inter-plate oil flow path and the fluid passage, and the inter-plate oil flow path is formed. A second oil path is formed from the second oil introduction port to the second oil discharge port independently of the first oil path, and the refrigerant is discharged from the refrigerant introduction port by the inter-plate refrigerant flow path. A refrigerant path leading to the outlet is formed, and in the first oil path, the first oil makes a U-turn in the heat exchange section in a direction orthogonal to the core plate stacking direction and makes a U-turn as a whole. The fluid passage is formed so as to flow in the stacking direction, and is characterized in that the fluid passage communicates with the first oil passage through an oil passage portion formed in the intermediate plate.

According to the present invention, by forming the first oil path using the fluid passage, the first oil introduction portion and the first oil discharge portion are integrated at one end in the core plate stacking direction, or on both sides. Separation can be easily carried out without being restricted by the second oil path and the refrigerant path.

Further, since the first oil path is formed so as to flow in the core plate laminating direction as a whole while changing the flow direction in the heat exchange portion in the direction orthogonal to the core plate laminating direction and making a U-turn, the flow velocity decreases. It is possible to secure a large amount of heat exchange between the first oil and the refrigerant with a small number of core plates while suppressing the above.

That is, it is possible to further improve the degree of freedom in setting the flow path configuration in the heat exchange unit and the heat exchange efficiency.

An exploded perspective view of the oil cooler according to the present invention. The plan view of the oil cooler which concerns on this invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 2 is a cross-sectional view taken along the line BB of FIG. A perspective view showing a part of the fin plate in an enlarged manner.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, for convenience of explanation, terms such as "top", "bottom", "top", and "bottom" are used with reference to the posture of FIG. 1, but the present invention is limited thereto. is not.

FIG. 1 is an exploded perspective view of the oil cooler 1 according to the present invention. FIG. 2 is a plan view of the oil cooler 1 according to the present invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a cross-sectional view taken along the line BB of FIG.

The oil cooler 1 which is a heat exchanger cools two independent oil flows by one refrigerant flow, for example, the engine oil of an internal combustion engine mounted on a vehicle and the vehicle. It cools the transmission oil of the mounted transmission.

The oil cooler 1 has a heat exchange unit 2 that exchanges heat between the first oil and the second oil and cooling water as a refrigerant, and a relatively thick plate-like shape attached to the upper surface of the heat exchange unit 2. It is roughly composed of a top plate 3 and a plate-shaped bottom plate 4 which is relatively thick and has sufficient rigidity and is attached to the lower surface of the heat exchange portion 2.

In the heat exchange unit 2, a large number of first core plates 6 having a common basic shape and a large number of second core plates 7 are alternately laminated, and between the first core plate 6 and the second core plate 7. , The plate-to-plate oil flow path 9 and the plate-to-plate cooling water flow path 10 (plate-to-plate refrigerant flow path) are alternately configured. The inter-plate oil flow path 9 has a predetermined height in the flow path along the core plate stacking direction (vertical direction), and is a flow path along the core plate stacking direction of the inter-plate cooling water flow path 10. It is set to be higher than the height. In other words, in the first core plate 6 and the second core plate 7, the heights of the flow paths of the inter-plate oil flow path 9 and the inter-plate cooling water flow path 10 along the core plate stacking direction are predetermined heights, respectively. Is set to.

In the oil cooler 1, as shown in FIGS. 3 and 4, nine inter-plate oil flow paths 9 and eight inter-plate cooling water flow paths 10 are formed in the heat exchange unit 2.

In the illustrated example, an interplate oil flow path 9 is formed between the lower surface of the first core plate 6 and the upper surface of the second core plate 7, and the upper surface of the first core plate 6 and the lower surface of the second core plate 7 are formed. An inter-plate cooling water flow path 10 is configured between the plates. A substantially square fin plate 8 is arranged in each plate-to-plate oil flow path 9.

Further, in this embodiment, of the nine plate-to-plate oil flow paths 9, one plate-to-plate oil flow path 9a located at an intermediate position in the core plate stacking direction is replaced with a fin plate 8 and is thickened. An intermediate plate 5 in the shape of an intermediate plate 5 is arranged. In other words, the intermediate plate 5 is sandwiched between the first core plate 6a and the second core plate 7a at an intermediate position in the plate stacking direction of the heat exchange portion 2. The intermediate plate 5 has a plate thickness such that the height of the flow path along the core plate stacking direction of the inter-plate oil flow path 9a becomes a predetermined height.

In FIG. 1, the numbers of the first core plate 6, the second core plate 7, and the fin plate 8 are partially omitted.

A large number of first and second core plates 6 and 7, a top plate 3, a bottom plate 4, a large number of fin plates 8 and an intermediate plate 5 are joined together by brazing and integrated. Specifically, each of these parts is formed by using a so-called clad material in which a brazing material layer is coated on the surface of an aluminum alloy base material, and each part is temporarily assembled in a predetermined position and heated in a furnace. By doing so, it is brazed integrally.

The first core plate 6 and the second core plate 7 located at the uppermost portion and the lowermost portion of the heat exchange portion 2 are located at the intermediate portion of the heat exchange portion 2 due to the relationship with the top plate 3 and the bottom plate 4. The configuration is slightly different from the general first core plate 6 and second core plate 7.

The fin plate 8 in FIG. 1 is schematically drawn, and is formed as, for example, an offset type corrugated fin as shown in FIG.

That is, the fin plate 8 is a corrugated fin formed by bending one base material into a rectangular or U-shape at regular pitch intervals, and is particularly from an offset type corrugated fin in which the corrugated position is deviated by half a pitch at a certain width. It has become.

The oil cooler 1 has a first oil introduction portion 17 as a first oil introduction port for introducing the first oil and a first oil for discharging the first oil at the upper end which is one end in the core plate stacking direction. It has a first oil discharge unit 18 as a discharge port.

Further, the oil cooler 1 has a cooling water introduction unit 19 as a refrigerant introduction port for introducing cooling water and a cooling water discharge port as a refrigerant discharge port for discharging cooling water at the upper end which is one end in the core plate stacking direction. It has a part 20.

The first oil introduction unit 17, the first oil discharge unit 18, the cooling water introduction unit 19, and the cooling water discharge unit 20 are formed at four corners of a substantially square top plate 3.

More specifically, the first oil introduction portion 17 and the first oil discharge portion 18 are located on the outer edge of the top plate and are formed on the diagonal line of the top plate which is symmetrical with respect to the center of the top plate. Further, the cooling water introduction portion 19 and the cooling water discharge portion 20 are located on the outer edge of the top plate and are formed on the diagonal line of the top plate which is symmetrical with the center of the top plate in between. The cooling water introduction unit 19 and the cooling water discharge unit 20 are formed on a diagonal top plate different from the first oil introduction unit 17 and the first oil discharge unit 18.

Further, the top plate 3 is formed with a passage portion 3a recessed so as to be convex toward the outside (upper side) along the diagonal line where the first oil introduction portion 17 and the first oil discharge portion 18 are located. Has been done. The passage portion 3a provides a space for oil flow between the first core plate 6 located at the uppermost portion of the heat exchange portion 2 and the upper end of the oil return passage 24 described later and the first oil discharge portion 18. It is what forms.

Then, the oil cooler 1 discharges the second oil introduction portion 21 as the second oil introduction port for introducing the second oil and the second oil to the lower end which is the end portion on one side in the core plate stacking direction. It has a second oil discharge unit 22 as an oil discharge port.

The second oil introduction portion 21 and the second oil discharge portion 22 are formed on the bottom plate 4.

The second oil introduction portion 21 and the second oil discharge portion 22 are located on the diagonal line of the bottom plate which is symmetrical with respect to the center of the bottom plate having a substantially square shape.

The bottom plate 4 is attached to a cylinder block or the like (not shown) via a gasket or the like (not shown) that can seal the periphery of the second oil introduction portion 21 and the second oil discharge portion 22.

41 in FIG. 1 is a cooling water introduction pipe connected to the cooling water introduction unit 19, and 42 in FIG. 1 is a cooling water discharge pipe connected to the cooling water discharge unit 20.

Further, 43 in FIG. 1 is a first oil introduction pipe connected to the first oil introduction unit 17, and 44 in FIG. 1 is a first oil discharge pipe connected to the first oil discharge unit 18. be.

The first core plate 6 and the second core plate 7 are press-molded from a thin base material of an aluminum alloy, and form a substantially square shape as a whole, and have three oil passage holes 15 and two cooling water passage holes 16. have.

The oil passage hole 15 is composed of a first oil passage hole 25 located in the center of the core plate and a pair of second oil passage holes 26 located on the diagonal line of the core plate symmetrical with respect to the first oil passage hole 25. It has become.

The first oil passage hole 25 constitutes an oil return passage 24 (see FIGS. 3 and 4) as a fluid passage that penetrates the heat exchange portion 2 in the core plate stacking direction and communicates with the first oil discharge portion 18. It is a thing. That is, the oil return passage 24 is configured by utilizing the first oil passage hole 25 which is a through hole formed in the center of the core plates 6 and 7.

The second oil passage hole 26 is located on the outer edge of the core plate.

Further, in the second core plate 7a located at an intermediate position in the core plate stacking direction, one of the pair of second oil passage holes 26 is closed to form an oil closed portion 28.

Further, 29 in FIGS. 1 and 3 is an oil blocking portion in which one of the pair of second oil passage holes 26 of the second core plate 7 located above the second core plate 7a having the oil blocking portion 28 is closed. be.

In the oil cooler 1 of this embodiment, the oil closing portions 28 and 29 are located directly below the first oil introduction portion 17.

Further, an intermediate plate 5 is adjacent to the second core plate 7a having the oil blocking portion 28.

Here, the intermediate plate 5 has a substantially square shape as a whole, and has one elongated hole 47 and a pair (two) of intermediate cooling water passage holes 48.

The elongated hole 47 corresponds to an oil flow portion, is formed on the diagonal line of the intermediate plate, and is continuous from the outer edge of the intermediate plate 5 to the center of the intermediate plate 5.

More specifically, in the heat exchange portion 2, the elongated hole 47 communicates with the first oil passage hole 25 of the upper first core plate 6a having one end adjacent to the first core plate 6a, and the other end thereof is adjacent to the first oil passage hole 25. It communicates with one of the pair of second oil passage holes 26 of the core plate 6a.

The intermediate cooling water passage hole 48 communicates with the cooling water passage holes 16 of the adjacent upper and lower core plates 6a and 7a in the heat exchange portion 2.

The intermediate plate 5 has an upper surface in contact with the bottom surface of the adjacent first core plate 6a and a lower surface in contact with the upper surface of the adjacent second core plate 7a.

Therefore, the inter-plate oil flow path 9a located at the intermediate position in the core plate stacking direction of the heat exchange portion 2 is substantially formed by the elongated hole 47 of the intermediate plate 5.

The cooling water passage hole 16 is located on the outer edge of the core plate and is formed from the first cooling water passage hole 31 and the second cooling water passage hole 32 formed on the diagonal line of the core plate which are symmetrical with respect to the center of the core plate. It has become. The cooling water passage hole 16 is formed on a diagonal line of the core plate, which is different from the oil passage hole 15.

In the heat exchange section 2, the first cooling water passage hole 31 is located directly below the cooling water introduction section 19. In the heat exchange unit 2, the second cooling water passage hole 32 is located directly below the cooling water discharge unit 20.

As shown in FIG. 3, in the heat exchange portion 2, the nine inter-plate oil flow paths 9 are formed by the oil blockage portions 28 and 29 and the intermediate plate 5, and the upper side is composed of the upper two inter-plate oil flow paths 9. The side oil flow path group 12a, the intermediate oil flow path group 12b consisting of the three central plate-to-plate oil flow paths 9, and the lower oil flow path group 12c consisting of the four lower plate-to-plate oil flow paths 9 It is divided.

Further, in the heat exchange section 2, the oil blocking section 28 and the intermediate plate 5 form a first oil path 11a through which the first oil flows and a second oil path 11b through which the second oil flows.

The arrow in FIG. 3 indicates the flow of oil, the solid line indicates the first oil path 11a, and the broken line indicates the second oil path 11b.

The intermediate oil flow path group 12b and the lower oil flow path group 12c are separated from each other by the oil blocking portion 28 and the intermediate plate 5. That is, the first oil path 11a and the second oil path 11b are independent oil paths in the heat exchange unit 2.

The first oil path 11a is a path through which the first oil flows from the first oil introduction section 17 to the first oil discharge section 18.

The second oil path 11b is a path through which the second oil flows from the second oil introduction section 21 to the second oil discharge section 22.

The first oil passage 11a is mainly composed of an upper oil flow path group 12a, an intermediate oil flow path group 12b, an oil return passage 24, and a passage portion 3a.

In the first oil path 11a, the oil blocking portion 29 causes the first oil to change the flow direction in the heat exchange portion 2 in a direction orthogonal to the core plate laminating direction and make a U-turn, and the core plate laminating direction as a whole. It is designed to flow to.

The second oil passage 11b is mainly composed of the lower oil passage group 12c.

In the second oil passage 11b, the four plate-to-plate oil passages 9 are in a parallel relationship with each other.

As shown in FIG. 4, in the heat exchange unit 2, one cooling water flow path group 13 (refrigerant flow path group) is configured by eight inter-plate cooling water flow paths 10.

The inter-plate cooling water flow paths 10 in the cooling water flow path group 13 are connected to each other in parallel. That is, in the heat exchange unit 2, the eight inter-plate cooling water flow paths 10 are connected in parallel with each other. The cooling water flow path group 13 discharges the cooling water introduced from the cooling water introduction unit 19 from the cooling water discharge unit 20. That is, the path through which the cooling water flows from the cooling water introduction section 19 to the cooling water discharge section 20 via the cooling water flow path group 13 corresponds to the cooling water path 14 (refrigerant path).

The cooling water introduced from the cooling water introduction unit 19 changes the direction of flow in the heat exchange unit 2 in a direction orthogonal to the core plate stacking direction, and is discharged from the cooling water discharge unit 20 on the opposite side.

In the first core plate 6, the periphery of each second oil passage hole 26 is formed as a boss portion 35 so as to project one step higher toward the inter-plate cooling water flow path 10 side, and the first and second cooling water passage holes are formed. The periphery of 31 and 32 is formed as a boss portion 38 one step higher so as to project toward the oil flow path 9 between the plates. Further, in the first core plate 6, the periphery of the first oil passage hole 25 is formed as a boss portion 36 one step higher so as to project to both the inter-plate cooling water flow path 10 side and the inter-plate oil flow path 9 side. There is.

In the second core plate 7, the periphery of the first and second cooling water passage holes 31 and 32 is formed as a boss portion 38 so as to protrude toward the inter-plate oil flow path 9 side, and each second oil is formed. The periphery of the passage hole 26 is formed as a boss portion 35 one step higher so as to protrude toward the inter-plate cooling water flow path 10 side. Further, in the second core plate 7, the periphery of the first oil passage hole 25 is formed as a boss portion 36 one step higher so as to project to both the inter-plate cooling water flow path 10 side and the inter-plate oil flow path 9 side. There is.

Therefore, by alternately combining the first core plate 6 and the second core plate 7, an inter-plate oil flow path 9 and an inter-plate cooling water flow path are provided between the first core plate 6 and the second core plate 7. A constant interval of 10 is maintained.

The boss portion 35 around the second oil passage hole 26 in the first core plate 6 is joined to the boss portion 35 around the second oil passage hole 26 in one of the adjacent second core plates 7. As a result, the upper and lower plate-to-plate oil flow paths 9 communicate with each other and are isolated from the plate-to-plate cooling water flow paths 10 between the two. Therefore, in a state where a large number of first core plates 6 and second core plates 7 are joined, basically, the oil flow paths 9 between the plates communicate with each other through a large number of second oil passage holes 26. At the same time, oil can be circulated in the heat exchange section 2 in the core plate stacking direction as a whole.

The boss portions 38 around the first and second cooling water passage holes 31 and 32 in the second core plate 7 are the bosses around the first and second cooling water passage holes 31 and 32 of one of the adjacent first core plates 6. Each is joined to the portion 38. As a result, the upper and lower plate-to-plate cooling water flow paths 10 communicate with each other and are isolated from the plate-to-plate oil flow paths 9 between the two. Therefore, in a state where a large number of first core plates 6 and a second core plate 7 are joined, the cooling water flow paths 10 between the plates are connected to each other through a large number of first and second cooling water passage holes 31 and 32. In addition to communicating with each other, cooling water can flow through the heat exchange unit 2 in the core plate stacking direction as a whole.

The boss portion 36 around the first oil passage hole 25 in the first core plate 6 is joined to the boss portion 36 around the first oil passage hole 25 in the adjacent upper and lower second core plates 7.

The boss portion 36 around the first oil passage hole 25 in the second core plate 7 is joined to the boss portion 36 around the first oil passage hole 25 in the adjacent upper and lower first core plates 6.

Therefore, in a state where a large number of first core plates 6 and second core plates 7 are joined, oil that penetrates the heat exchange portion 2 in the core plate stacking direction by each first oil passage hole 25 and each boss portion 36. The return passage 24 is configured. The oil return passage 24 does not directly communicate with the inter-plate oil flow path 9 between the first core plate 6 and the second core plate 7.

Further, the first core plate 6 and the second core plate 7 are formed with a large number of protrusions 45 protruding toward the inter-plate cooling water flow path 10.

The fin plate 8 sandwiched between the plate-to-plate oil flow paths 9 is formed with openings 46 corresponding to the three oil passage holes 15 and the two cooling water passage holes 16 at five locations. Each opening 46 is formed larger than the respective passage holes 15, 16 so as to have some margin for the corresponding boss portions 35, 36, 38.

In such an oil cooler 1, an oil return passage 24 penetrating the heat exchange portion 2 in the core plate stacking direction is formed via an inter-plate oil flow path 9a substantially formed by an elongated hole 47 of the intermediate plate 5. 1 It communicates with the intermediate oil flow path group 12b constituting the oil path 11a. In other words, the oil return passage 24 communicates with the first oil passage 11a via the elongated hole 47 of the intermediate plate 5.

Therefore, it is a limitation of the second oil path 11b and the cooling water path 14 that the first oil introduction section 17 and the first oil discharge section 18 are integrated at one end in the core plate stacking direction or divided into both sides. It can be easily implemented without receiving.

Further, since the first oil path 11a is formed so as to flow in the core plate laminating direction as a whole while changing the direction of the flow in the heat exchange portion 2 in the direction orthogonal to the core plate laminating direction and making a U-turn. A large amount of heat exchange between the first oil and the cooling water can be secured with a small number of core plates 6 and 7 while suppressing a decrease in the flow velocity.

That is, in the oil cooler 1, the degree of freedom in setting the flow path configuration in the heat exchange unit 2 and the heat exchange efficiency can be further improved.

If the oil return passage 24 is set at an unbalanced position of the heat exchange portion 2, the elongated hole 47 may become long and the passage resistance may increase.

However, since the oil return passage 24 of this embodiment is located at the center of the heat exchange unit 2, the flow path length of the elongated hole 47 is shortened while ensuring the degree of freedom in setting the flow path configuration in the heat exchange unit 2. can do.

1 ... Oil cooler 2 ... Heat exchange part 3 ... Top plate 3a ... Passage part 4 ... Bottom plate 5 ... Intermediate plate 6 ... First core plate 7 ... Second core plate 8 ... Fin plate 9 ... Inter-plate oil flow path 10 ... Inter-plate cooling water flow path 11a ... First oil path 11b ... Second oil path 12a ... Upper side oil flow path group 12b ... Intermediate oil flow path group 12c ... Lower side oil flow path group 13 ... Cooling water flow path group 14 ... Cooling water Path 15 ... Oil passage hole 16 ... Cooling water passage hole 17 ... First oil introduction part 18 ... First oil discharge part 19 ... Cooling water introduction part 20 ... Cooling water discharge part 21 ... Second oil introduction part 22 ... Second oil Discharge part 24 ... Oil return passage 25 ... First oil passage hole 26 ... Second oil passage hole 28 ... Oil blockage 29 ... Oil blockage 31 ... First cooling water passage hole 32 ... Second cooling water passage hole 35 ... Boss Part 36 ... Boss part 38 ... Boss part 41 ... Cooling water introduction pipe 42 ... Cooling water discharge pipe 43 ... First oil introduction pipe 44 ... First oil discharge pipe 47 ... Long hole 48 ... Intermediate cooling water passage hole

Claims (3)

In an oil cooler having a heat exchange section in which a large number of core plates are laminated and an oil flow path between plates and a refrigerant flow path between plates are alternately configured between each.
The first oil inlet where the first oil is introduced and
The first oil discharge port from which the first oil is discharged and
The second oil inlet where the second oil is introduced and
The second oil discharge port from which the second oil is discharged and
A refrigerant introduction port into which a refrigerant is introduced, a refrigerant discharge port in which the above-mentioned refrigerant is discharged, and a refrigerant discharge port.
A fluid passage that penetrates the heat exchange section in the core plate stacking direction,
An intermediate plate sandwiched between the core plates at an intermediate position in the core plate stacking direction of the heat exchange portion,
With fin plates arranged in the inter-plate oil flow path,
The intermediate plate is arranged in the inter-plate oil flow path instead of the fin plate.
The oil flow path between the plates and the fluid passage form a first oil path from the first oil introduction port to the first oil discharge port.
The inter-plate oil flow path forms a second oil path independent of the first oil path and from the second oil inlet to the second oil discharge port.
The inter-plate refrigerant flow path forms a refrigerant path from the refrigerant introduction port to the refrigerant discharge port.
The first oil path is formed so that the first oil flows in the core plate laminating direction as a whole while making a U-turn by changing the flow direction in the heat exchange portion in a direction orthogonal to the core plate laminating direction.
The oil cooler is characterized in that the fluid passage communicates with the first oil passage through an oil passage portion formed in the intermediate plate. The oil cooler according to claim 1, wherein the fluid passage utilizes a through hole formed in the center of the core plate. The oil cooler according to claim 1 or 2, wherein the oil passage portion is an elongated hole formed in the intermediate plate.

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