JP7035878B2 - Cooler - Google Patents

Description

The present invention relates to a cooler that cools a heating element.

Hybrid vehicles, electric vehicles, fuel cell vehicles equipped with fuel cells, and the like are powered by converting a DC voltage from a DC power source into an AC voltage and driving a motor with the converted AC voltage. Therefore, such a vehicle is equipped with a power conversion device that converts a DC voltage into an AC voltage, as disclosed in Patent Document 1, for example. The power conversion device includes a heating element such as a switching element that generates heat when energized. The heating element is cooled by a cooler (heat sink).

In Patent Document 1, the cooler has a housing having a refrigerant flow path inside through which cooling water (refrigerant) flows. A plurality of heating elements are arranged on the surface of the base of the housing, and a plurality of pin-shaped fins are formed on the back surface of the base. Then, the heat generated from the heating element is dissipated by heat exchange with the cooling water flowing through the refrigerant flow path via the base and a plurality of fins. This cools the heating element.

Japanese Unexamined Patent Publication No. 2009-38842

In a cooler provided with a plurality of fins as in Patent Document 1, it is desired to further improve heat dissipation performance.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a cooler capable of improving heat dissipation performance.

The cooler that solves the above-mentioned problems is a base having a first surface on which a heating element is mounted, and a surface of the base opposite to the first surface, which forms a refrigerant flow path through which the refrigerant flows. A cooler comprising a plurality of fins extending from two surfaces, wherein the base has a recess that opens between adjacent fins on the second surface, the second surface. Each of the upstream side of the recess in the flow direction of the refrigerant and the downstream side of the recess in the flow direction of the refrigerant have continuous surfaces continuous with the opening edge of the recess, and the inner surface of the recess has an inner surface. , It has a curved shape.

According to this, since the base has a recess that opens between adjacent fins on the second surface, the refrigerant and heat flowing in the refrigerant flow path are compared with the case where the base does not have the recess. The surface area of the replaceable base can be increased. Further, since the second surface has a continuous surface continuous with the opening edge of the recess on each of the upstream side in the refrigerant flow direction with respect to the recess and the downstream side in the refrigerant flow direction with respect to the recess. Compared with the case where the second surface does not have a continuous surface, the surface area of the base that can exchange heat with the refrigerant flowing through the refrigerant flow path can be increased. The inner surface of the recess has a curved surface. According to this, the refrigerant that has flowed into the recess flows smoothly along the inner surface of the recess, so that even if the base has a recess that opens on the second surface, the flow velocity of the refrigerant that flows through the refrigerant flow path is high. It is possible to prevent the recess from lowering. From the above, it is possible to increase the surface area of the base that can exchange heat with the refrigerant while suppressing the decrease in the flow velocity of the refrigerant. Therefore, the base of the heat generated from the heating element and the refrigerant flowing through the refrigerant flow path. And heat exchange via a plurality of fins is efficiently performed, and heat generated from the heating element is dissipated. Therefore, it is possible to improve the heat dissipation performance of the cooler.

In the cooler, the fins may be pin fins.
According to this, since the fins are pin fins, peeling of the refrigerant flowing through the refrigerant flow path from the fins is less likely to occur as compared with the case where the fins are straight fins, for example. Therefore, heat exchange between the refrigerant flowing in the refrigerant flow path and the fins is facilitated, so that the heat dissipation performance of the cooler can be further improved.

In the cooler, the plurality of fins are staggered, and the recesses are located between adjacent fins on the second surface and in a converging portion where the refrigerant flowing in the refrigerant flow path converges. It should be open.

According to this, on the second surface, since the concave portion is opened in the converging portion between the adjacent fins and in the converging portion where the refrigerant flowing in the refrigerant flow path converges, the refrigerant flows between the adjacent fins. The cross-sectional area of the flow path at the converging portion increases, and the convergent refrigerant easily flows between adjacent fins. Therefore, since the decrease in the flow velocity of the refrigerant at the converging portion where the refrigerant converges between the adjacent fins is suppressed, the heat dissipation performance in the cooler can be further improved.

According to the present invention, heat dissipation performance can be improved.

The perspective view which shows the cooler in embodiment. Sectional view of the cooler. Perspective view of the base. Top view of the base. A plan view showing a part of the base in an enlarged manner. A cross-sectional view showing a part of the base in an enlarged manner. (A) and (b) are sectional views for explaining the manufacturing method of a base. FIG. 6 is an enlarged cross-sectional view showing a part of the base in another embodiment.

Hereinafter, an embodiment in which the cooler is embodied will be described with reference to FIGS. 1 to 7. The cooler of the present embodiment constitutes, for example, a power conversion device mounted on an electric vehicle, a hybrid vehicle, or the like. The power conversion device converts the DC voltage input from the battery into an AC voltage and outputs it to the traveling motor. Then, the cooler cools a heating element such as a semiconductor element of the power conversion device.

As shown in FIGS. 1 and 2, the cooler 10 includes a housing 11 made of a metal material. The housing 11 is made of, for example, aluminum. The housing 11 has a flat cylindrical housing body 12 and a square flat plate-shaped base 13. The housing body 12 has a supply-side header portion 14 and a discharge-side header portion 15.

The supply-side header portion 14 has a first wall 14a and a second wall 14b having an isosceles trapezoidal shape in a plan view. Further, the supply-side header portion 14 includes a first connection wall 14c that connects one of the pair of legs of the first wall 14a and one of the pair of legs of the second wall 14b, and a pair of legs of the first wall 14a. It has a second connecting wall 14d that connects the other to the other of the pair of legs of the second wall 14b. The first wall 14a is inclined with respect to the second wall 14b so as to be separated from the second wall 14b from the lower bottom to the upper bottom of the first wall 14a. Therefore, in the first connecting wall 14c and the second connecting wall 14d, the upper bottom is continuous with the lower bottom of the first wall 14a and the lower bottom of the second wall 14b, and the lower bottom is the upper bottom and the first wall 14a. It has a planar viewing table shape that is continuous with the upper bottom of the two walls 14b.

Then, the supply port 14e of the supply side header portion 14 is formed by the upper bottom of the first wall 14a, the upper bottom of the second wall 14b, the lower bottom of the first connection wall 14c, and the lower bottom of the second connection wall 14d. ing. The supply port 14e has a square hole shape. Further, the supply side header portion 14 has a tubular supply side pipe 14f protruding from the supply port 14e. The inside of the supply side pipe 14f communicates with the supply port 14e.

Further, the discharge port 14g of the supply side header portion 14 is formed by the lower bottom of the first wall 14a, the lower bottom of the second wall 14b, the upper bottom of the first connection wall 14c, and the upper bottom of the second connection wall 14d. ing. The discharge port 14 g has a long square hole shape. The first wall 14a, the second wall 14b, the first connection wall 14c, and the second connection wall 14d form a supply-side flow path 14h connecting the supply port 14e and the discharge port 14g.

The discharge side header portion 15 has a first wall 15a and a second wall 15b having an isosceles trapezoidal shape in a plan view. Further, the discharge side header portion 15 is composed of a first connection wall 15c that connects one of the pair of legs of the first wall 15a and one of the pair of legs of the second wall 15b, and a pair of legs of the first wall 15a. It has a second connecting wall 15d that connects the other to the other of the pair of legs of the second wall 15b. The first wall 15a is inclined with respect to the second wall 15b so as to be separated from the second wall 15b from the lower bottom to the upper bottom of the first wall 15a. Therefore, in the first connecting wall 15c and the second connecting wall 15d, the upper bottom is continuous with the lower bottom of the first wall 15a and the lower bottom of the second wall 15b, and the lower bottom is the upper bottom and the first of the first wall 15a. It has a planar viewing table shape that is continuous with the upper bottom of the two walls 15b.

Then, the discharge port 15e of the discharge side header portion 15 is formed by the upper bottom of the first wall 15a, the upper bottom of the second wall 15b, the lower bottom of the first connection wall 15c, and the lower bottom of the second connection wall 15d. ing. The discharge port 15e has a square hole shape. Further, the discharge side header portion 15 has a cylindrical discharge side pipe 15f protruding from the discharge port 15e. The inside of the discharge side pipe 15f communicates with the discharge port 15e.

Further, the supply port 15g of the discharge side header portion 15 is formed by the lower bottom of the first wall 15a, the lower bottom of the second wall 15b, the upper bottom of the first connection wall 15c, and the upper bottom of the second connection wall 15d. ing. The supply port 15 g has a long square hole shape. The first wall 15a, the second wall 15b, the first connection wall 15c, and the second connection wall 15d form a discharge side flow path 15h connecting the supply port 15g and the discharge port 15e.

The housing body 12 has a connecting portion 16 that connects the supply-side header portion 14 and the discharge-side header portion 15. The connecting portion 16 has a flat plate-shaped first connecting wall 16a that connects the second wall 14b of the supply-side header portion 14 and the second wall 15b of the discharge-side header portion 15. The second wall 14b of the supply-side header portion 14, the second wall 15b of the discharge-side header portion 15, and the first connecting wall 16a are located on the same plane.

Further, the connecting portion 16 includes a second connecting wall 16b that connects the upper bottom of the first connection wall 14c of the supply side header portion 14 and the upper bottom of the first connection wall 15c of the discharge side header portion 15, and a supply side header. It has a third connecting wall 16c that connects the upper bottom of the second connecting wall 14d of the portion 14 and the upper bottom of the second connecting wall 15d of the discharge side header portion 15. The second connecting wall 16b and the third connecting wall 16c are erected in the directions orthogonal to the first connecting wall 16a from both side edges of the first connecting wall 16a. The second connecting wall 16b and the third connecting wall 16c extend in parallel with each other.

The edge of the second connecting wall 16b opposite to the first connecting wall 16a and the edge of the third connecting wall 16c opposite to the first connecting wall 16a are the first wall 14a of the supply side header portion 14. It is continuous with the lower bottom and the lower bottom of the first wall 15a of the discharge side header portion 15. The housing body 12 has a lower bottom of the first wall 14a of the supply-side header portion 14, a lower bottom of the first wall 15a of the discharge-side header portion 15, and a side opposite to the first connecting wall 16a of the second connecting wall 16b. It has an opening 12a formed by an edge portion of the third connecting wall 16c and an edge portion opposite to the first connecting wall 16a in the third connecting wall 16c. The opening 12a has a square hole shape in a plan view.

The base 13 closes the opening 12a. The base 13 has a lower bottom of the first wall 14a of the supply-side header portion 14, a lower bottom of the first wall 15a of the discharge-side header portion 15, and an edge portion of the second connecting wall 16b opposite to the first connecting wall 16a. , The edges of the third connecting wall 16c on the opposite side of the first connecting wall 16a are joined, for example, by welding. The base 13 has a first surface 13a on which the heating element 19 is mounted. The second surface 13b, which is the surface of the base 13 opposite to the first surface 13a, faces the first connecting wall 16a. The base 13, the first connecting wall 16a, the second connecting wall 16b, and the third connecting wall 16c have a refrigerant flow path 17 connecting the discharge port 14 g of the supply side header portion 14 and the supply port 15 g of the discharge side header portion 15. Is forming.

The cooling water as a refrigerant flowing in the supply side pipe 14f passes through the supply port 14e, the supply side flow path 14h, the discharge port 14g, the refrigerant flow path 17, the supply port 15g, the discharge side flow path 15h, and the discharge port 15e in this order. Then, it reaches the inside of the discharge side pipe 15f. Therefore, the second surface 13b of the base 13 forms a refrigerant flow path 17 through which the cooling water flows.

As shown in FIGS. 3 and 4, a plurality of fins 20 are extended on the second surface 13b of the base 13. Therefore, the cooler 10 includes a plurality of fins 20 extending from the second surface 13b of the base 13. The plurality of fins 20 are aluminum pin fins having a diamond-shaped columnar shape. The plurality of fins 20 are integrally formed with the base 13. The plurality of fins 20 extend in a direction orthogonal to the second surface 13b. The end faces of each fin 20 on the opposite side of the second surface 13b are flat surfaces.

As shown in FIG. 2, the end surface of each fin 20 opposite to the second surface 13b is in surface contact with the first connecting wall 16a. Therefore, the plurality of fins 20 extend from the second surface 13b of the base 13 toward the first connecting wall 16a, and extend from the second surface 13b until they come into contact with the first connecting wall 16a. The end surface of each fin 20 opposite to the second surface 13b and the first connecting wall 16a do not come into surface contact with each other, and the end surface of each fin 20 opposite to the second surface 13b and the first connecting wall 16a. A certain gap may be provided between the and. The plurality of fins 20 are arranged in the refrigerant flow path 17. The cooling water flowing in the refrigerant flow path 17 flows from the discharge port 14 g of the supply side header portion 14 toward the supply port 15 g of the discharge side header portion 15. At this time, a part of the cooling water flowing in the refrigerant flow path 17 passes between the adjacent fins 20.

As shown in FIG. 4, the plurality of fins 20 are arranged side by side at equal intervals in the first facing direction Y1 in which the second connecting wall 16b and the third connecting wall 16c face each other. Further, the plurality of fins 20 are arranged side by side at equal intervals in the second facing direction X1 in which the discharge port 14 g of the supply side header portion 14 and the supply port 15 g of the discharge side header portion 15 face each other. There is. Further, the plurality of fins 20 are arranged side by side at equal intervals on the diagonal directions Z1 and Z2 of the second surface 13b of the base 13. The plurality of fins 20 are staggered.

In FIG. 5, the flow directions of the cooling water are indicated by arrows R1 and R2. As shown by the arrow R1 in FIG. 5, between the fins 20 adjacent to each other in the first facing direction Y1, there is a converging portion where the cooling water flowing through the refrigerant flow path 17 converges. Further, as shown by an arrow R2 in FIG. 5, the converged cooling water is distributed between the fins 20 adjacent to each other in the diagonal directions Z1 and Z2, and between the fins 20 adjacent to each other in the first facing direction Y1. It is a distribution part.

The base 13 has a plurality of recesses 30. Each recess 30 is open between adjacent fins 20 on the second surface 13b. A part of the plurality of recesses 30 is open between adjacent fins 20 in the first facing direction Y1 and between adjacent fins 20 in the second facing direction X1. Therefore, the recess 30 is open between the adjacent fins 20 on the second surface 13b and at the converging portion where the cooling water flowing through the refrigerant flow path 17 converges.

Further, the other portions of the plurality of recesses 30 are opened between adjacent fins 20 in the diagonal directions Z1 and Z2. Therefore, the recess 30 is also opened in the distribution portion between the adjacent fins 20 on the second surface 13b and where the converged cooling water is distributed between the adjacent fins 20 in the first facing direction Y1. is doing.

The second surface 13b is continuous with the opening edge 30e of each recess 30 on the upstream side in the cooling water flow direction with respect to each recess 30 and on the downstream side in the cooling water flow direction with respect to each recess 30. It has a surface 13c.

As shown in FIG. 6, the inner surface 30a of the recess 30 has a hemispherical shape. Therefore, the inner surface 30a of the recess 30 has a curved surface shape. The inner surface 30a of the recess 30 is continuous with the opening edge 30e of the recess 30. The opening edge 30e of the recess 30 has a perfect circular shape in a plan view. The depth H10 of the lowermost portion 30b of the recess 30 is smaller than the diameter R10 of the opening edge 30e. In the present embodiment, the depth H10 of the lowermost portion 30b of the recess 30 is set to 1/2 of the diameter R10 of the opening edge 30e.

The second surface 13b has a connecting surface 13d that connects the opening edge 30e of the recess 30 and the root 20e of the fin 20. Therefore, the recess 30 and the fin 20 are discontinuous. Therefore, the entire circumference of the opening edge 30e of the recess 30 is continuous with the second surface 13b. The recess 30 is surrounded by the continuous surface 13c and the connecting surface 13d of the second surface 13b.

As shown in FIGS. 7 (a) and 7 (b), the base 13 is a square flat plate forged material 40 formed of aluminum, forged using a first die 41 and a second die 42. It is manufactured by doing. Therefore, the base 13 is formed by molding.

As shown in FIG. 7A, the first die 41 has a bottomed square box shape capable of accommodating the forging material 40. A plurality of rhombic hole-shaped fin forming holes 41h for forming each fin 20 are formed on the bottom wall 41a of the first mold 41. Further, a recess forming protrusion 41f for forming each recess 30 is formed between adjacent fin forming holes 41h on the inner surface of the bottom wall 41a. The second mold 42 has a square flat plate shape. The second mold 42 can be arranged in the first mold 41.

As shown in FIG. 7B, in a state where the forging material 40 is housed in the first die 41, the second die 42 is arranged in the first die 41, and the second die 42 is used. The forged material 40 is pressed toward the bottom wall 41a of the first die 41. Then, a part of the forging material 40 flows into each fin forming hole 41h, and a part of the forging material 40 is filled in each fin forming hole 41h. In this way, the fins 20 are formed by filling a part of the forging material 40 into the fin forming holes 41h.

Further, when the forging material 40 is pressed toward the bottom wall 41a of the first die 41 by the second die 42, the forging material 40 is pressed against the inner surface of the bottom wall 41a of the first die 41 and each recess is formed. The protrusions 41f pierce the forging material 40, and each portion of the forging material 40 pierced by the protrusions 41f for forming the recesses is deformed so as to be dented. In this way, the recesses 30 are formed by the protrusions 41f for forming the recesses piercing the forging material 40 and the portions of the forging material 40 pierced by the protrusions 41f for forming the recesses are deformed so as to be recessed. Therefore, the plurality of fins 20 and the plurality of recesses 30 provided in the base 13 are integrally formed with the base 13 by molding the base 13.

Next, the operation of this embodiment will be described.
The heat generated from the heating element 19 is dissipated by heat exchange with the cooling water flowing through the refrigerant flow path 17 via the base 13 and the plurality of fins 20. Since the inner surface 30a of each recess 30 has a curved surface shape, the cooling water that has flowed into each recess 30 smoothly flows along the inner surface 30a of each recess 30. Therefore, even if the base 13 has a recess 30 that opens in the second surface 13b, it is suppressed that the flow velocity of the cooling water flowing through the refrigerant flow path 17 is lowered by the recess 30. Therefore, heat exchange between the heat generated from the heating element 19 and the cooling water flowing through the refrigerant flow path 17 via the base 13 is efficiently performed.

In the above embodiment, the following effects can be obtained.
(1) The base 13 has a recess 30 that opens between adjacent fins 20 on the second surface 13b. Therefore, the surface area of the base 13 that can exchange heat with the cooling water flowing through the refrigerant flow path 17 can be increased as compared with the case where the base 13 does not have the recess 30. Further, the second surface 13b is a continuous surface continuous with the opening edge 30e of the recess 30 on the upstream side in the cooling water flow direction with respect to the recess 30 and on the downstream side in the cooling water flow direction with respect to the recess 30. It has 13c. Therefore, the surface area of the base 13 that can exchange heat with the cooling water flowing through the refrigerant flow path 17 can be increased as compared with the case where the second surface 13b does not have the continuous surface 13c. The inner surface 30a of the recess 30 has a curved surface shape. According to this, since the cooling water that has flowed into the recess 30 smoothly flows along the inner surface 30a of the recess 30, even if the base 13 has the recess 30 that opens to the second surface 13b, the refrigerant flow. It is possible to prevent the flow velocity of the cooling water flowing through the path 17 from being lowered by the recess 30. From the above, it is possible to increase the surface area of the base 13 that can exchange heat with the cooling water while suppressing the decrease in the flow velocity of the cooling water. Heat exchange with the flowing cooling water via the base 13 and the plurality of fins 20 is efficiently performed, and the heat generated from the heating element 19 is dissipated. Therefore, it is possible to improve the heat dissipation performance of the cooler 10.

(2) Since the fin 20 is a pin fin, it is less likely that the cooling water flowing through the refrigerant flow path 17 is peeled off from the fin 20 as compared with the case where the fin 20 is a straight fin, for example. Therefore, heat exchange between the cooling water flowing through the refrigerant flow path 17 and the fins 20 is facilitated, so that the heat dissipation performance of the cooler 10 can be further improved.

(3) The plurality of fins 20 are staggered, and the recesses 30 are located between adjacent fins 20 on the second surface 13b and in a converging portion where the cooling water flowing through the refrigerant flow path 17 converges. It is open. According to this, on the second surface 13b, since the recess 30 is opened in the converging portion between the adjacent fins 20 and where the cooling water flowing through the refrigerant flow path converges, the adjacent fins 20 are adjacent to each other. The cross-sectional area of the flow path at the convergent portion where the cooling water converges between the fins increases, and the cooling water that converges between the adjacent fins 20 easily flows smoothly. Therefore, since the decrease in the flow velocity of the cooling water at the converging portion where the cooling water converges between the adjacent fins 20 is suppressed, the heat dissipation performance of the cooler 10 can be further improved.

(4) The plurality of fins 20 and the plurality of recesses 30 provided in the base 13 are integrally formed with the base 13 by molding the base 13. Therefore, since the plurality of fins 20 and the plurality of recesses 30 can be formed simultaneously with respect to the base 13, the manufacturing time can be shortened.

The above embodiment can be modified and implemented as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

○ As shown in FIG. 8, a part of the opening edge 30e of the recess 30 and the root 20e of the fin 20 may be continuous. In short, a part of the recess 30 and a part of the fin 20 may be continuous.

O In the embodiment, the housing 11 of the cooler 10 may be made of a metal other than aluminum.
O In the embodiment, the housing 11 of the cooler 10 may be made of, for example, resin. In short, the material of the housing 11 of the cooler 10 is not limited to metal.

○ In the embodiment, the base 13 may be manufactured by, for example, casting, die casting, or resin molding.
○ In the embodiment, the recess 30 may be formed on the second surface 13b of the base 13 by machining using a cutting tool or a machine tool.

○ In the embodiment, the recess 30 is a distribution portion in which the cooling water converged between the adjacent fins 20 on the second surface 13b and between the adjacent fins 20 in the first facing direction Y1 is distributed. It does not have to be open.

○ In the embodiment, the recess 30 does not have to be open between the adjacent fins 20 on the second surface 13b and at the converging portion where the cooling water flowing through the refrigerant flow path 17 converges.

○ In the embodiment, the number of recesses 30 is not particularly limited.
○ In the embodiment, the plurality of fins 20 may not be arranged in a staggered manner, and may be arranged in a matrix, for example. For example, even when a plurality of fins 20 are arranged in a matrix, a part of the plurality of recesses 30 is between adjacent fins 20 in the first facing direction Y1 and in the second facing direction X1. In addition to opening between the adjacent fins 20, the other of the plurality of recesses 30 may be opened between the adjacent fins 20 in the diagonal directions Z1 and Z2.

O In the embodiment, the depth H10 of the lowermost portion 30b of the recess 30 may be set to, for example, 1/3 of the diameter R10 of the opening edge 30e.
O In the embodiment, the depth H10 of the lowermost portion 30b of the recess 30 may be the same as the diameter R10 of the opening edge 30e.

O In the embodiment, the depth H10 of the lowermost portion 30b of the recess 30 may be larger than the diameter R10 of the opening edge 30e. In this case, the depth H10 of the lowermost portion 30b of the recess 30 is preferably set within three times the diameter R10 of the opening edge 30e.

○ In the embodiment, the recess 30 may have a configuration in which the opening edge 30e of the recess 30 has an elliptical shape or a teardrop shape (teardrop shape) when viewed in a plan view. Even in this case, the inner surface 30a of the recess 30 has a curved surface shape.

○ In the embodiment, the fin 20 may be, for example, a columnar or rectangular columnar shape.
O In the embodiment, the fin 20 may be, for example, a straight fin. When the fin 20 is a straight fin, the fin 20 extends in the refrigerant flow path 17 from the discharge port 14 g of the supply side header portion 14 toward the supply port 15 g of the discharge side header portion 15.

○ In the embodiment, the fin 20 may not be integrally formed with the base 13, and the fin 20 which is a member different from the base 13 may be joined to the second surface 13b of the base 13, for example, by brazing. good.

O In the embodiment, a recess may be formed on the outer surface of the fin 20.
○ In the embodiment, a fluid other than cooling water may be used as the refrigerant.

10 ... cooler, 13 ... base, 13a ... first surface, 13b ... second surface, 13c ... continuous surface, 17 ... refrigerant flow path, 19 ... heating element, 20 ... fins, 30 ... recesses, 30a ... inner surface, 30e ... Opening edge.

Claims (3)

A base with a first surface on which a heating element is mounted, and
A cooler comprising a plurality of fins extending from a second surface of the base opposite to the first surface and forming a refrigerant flow path through which the refrigerant flows.
The base has a recess that opens between adjacent fins on the second surface.
The second surface has a continuous surface continuous with the opening edge of the recess on the upstream side in the flow direction of the refrigerant with respect to the recess and on the downstream side in the flow direction of the refrigerant with respect to the recess.
A cooler characterized in that the inner surface of the recess has a curved surface shape. The cooler according to claim 1, wherein the fin is a pin fin. The plurality of fins are staggered and arranged in a staggered manner.
The cooler according to claim 2, wherein the recess is between adjacent fins on the second surface and is open at a converging portion where the refrigerant flowing through the refrigerant flow path converges. ..

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