CN118202459A

CN118202459A - Heat radiation member

Info

Publication number: CN118202459A
Application number: CN202280067970.6A
Authority: CN
Inventors: 高奕桓; 西川和宏; 村上浩二; 堀裕多; 井上健吾; 柳田裕毅
Original assignee: Nidec Corp; Nidec Chaun Choung Technology Corp
Current assignee: Nidec Corp; Nidec Chaun Choung Technology Corp
Priority date: 2021-10-14
Filing date: 2022-10-05
Publication date: 2024-06-14
Also published as: WO2023063192A1

Abstract

The heat dissipation member has: a plate-shaped base portion that expands in a first direction and a second direction along a direction in which the refrigerant flows and has a thickness in a third direction; and a fin group constituted by arranging a plurality of fins extending in the first direction and protruding from the base portion to one side in the third direction in the second direction, or a plurality of fin groups arranged in the first direction. At least any one of the fins included in at least any one of the fin groups has at least one spoiler. The spoiler has: a through hole penetrating in the second direction; and a protruding portion protruding from a peripheral edge of the through hole in the second direction and including an opposing surface opposing a downstream side of the flow direction of the refrigerant, that is, a side of the first direction. And a plurality of spoilers are arranged on the fins at the same second direction position along the first direction. At least one of the plurality of spoilers has the projection continuously provided along a portion of the entire circumference of the through-hole.

Description

Heat radiation member

Technical Field

The present disclosure relates to a heat dissipation member.

Background

Conventionally, a heat radiation member has been used for cooling a heating element. The heat dissipation member has a base portion and a plurality of fins. A plurality of fins protrude from the base portion. By flowing a refrigerant such as water between adjacent fins among the plurality of fins, heat of the heating element is moved toward the refrigerant (for example, refer to patent document 1).

Prior art literature

Patent literature

Patent document 1: chinese publication No.: chinese patent application publication No. 106546116

Disclosure of Invention

Technical problem to be solved by the invention

In conventional heat dissipation members, it has been an issue to improve cooling performance and to suppress pressure loss. If the pressure loss increases, a desired flow rate may not be ensured depending on the performance of the pump for circulating the refrigerant. Or, to ensure the desired flow, a large, expensive pump is required.

In view of the above, an object of the present disclosure is to provide a heat radiation member capable of improving cooling performance and suppressing pressure loss at the same time.

Technical proposal adopted for solving the technical problems

An exemplary heat dissipation member of the present disclosure has: a plate-shaped base portion that expands in a first direction along a direction in which the refrigerant flows and in a second direction orthogonal to the first direction, and that has a thickness in a third direction orthogonal to the first direction and the second direction; and a fin group configured by arranging a plurality of fins protruding from the base portion to the third direction side and extending in the first direction in the second direction, or a plurality of fin groups arranged in the first direction. At least any one of the fins included in at least any one of the fin groups has at least one spoiler. The spoiler has: a through hole penetrating in the second direction; and a protruding portion protruding from a peripheral edge of the through hole in the second direction and including an opposing surface opposing a downstream side of the flow direction of the refrigerant, that is, a side of the first direction. And a plurality of spoilers are arranged on the fins at the same second direction position along the first direction. At least one of the plurality of spoilers has the projection continuously provided along a portion of the entire circumference of the through-hole.

Effects of the invention

According to the exemplary heat radiation member of the present disclosure, both improvement of cooling performance and suppression of pressure loss can be achieved.

Drawings

Fig. 1 is a perspective view of a heat dissipating member of an exemplary embodiment of the present disclosure.

Fig. 2 is a side view of the heat radiation member as seen to the second direction side.

Fig. 3 is a plan view of the heat radiation member as seen from the third direction side.

FIG. 4 is a perspective view of a first fin plate.

FIG. 5 is a perspective view of a second fin plate.

Fig. 6 is an enlarged perspective view showing the structure of the first spoiler.

Fig. 7 is an enlarged perspective view showing a structure of another first spoiler.

Fig. 8 is an enlarged perspective view showing the structure of the second spoiler.

Fig. 9 is a side view showing a modification of the second spoiler.

Fig. 10 is a partial enlarged view showing a structure in the vicinity between the upstream side fin group and the center fin group.

Fig. 11 is a side view showing an example of height adjustment of the fins.

Detailed Description

Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings.

In the drawings, a first direction is referred to as an X direction, X1 is referred to as one side of the first direction, and X2 is referred to as the other side of the first direction. The first direction is along the direction F in which the refrigerant W flows, and the downstream side is denoted as F1 and the upstream side is denoted as F2. A second direction orthogonal to the first direction is referred to as a Y direction, Y1 is referred to as one side of the second direction, and Y2 is referred to as the other side of the second direction. A third direction orthogonal to the first direction and the second direction is referred to as a Z direction, Z1 is referred to as one side of the third direction, and Z2 is referred to as the other side of the third direction. In addition, the orthogonality includes an intersection at an angle slightly deviated from 90 degrees. The above-described directions are not limited to directions when the heat radiation member 1 is assembled to various devices.

1. Integral Structure of Heat dissipating Member

Fig. 1 is a perspective view of a heat dissipation member 1 of an exemplary embodiment of the present disclosure. Fig. 2 is a side view of the heat radiation member 1 as viewed toward the second direction side. Fig. 3 is a plan view of the heat radiation member 1 as seen from the third direction side. However, for convenience, fig. 2 is a view in which the third fin plate FP3 (fig. 1) located at the other side most in the second direction is removed. Thus, in fig. 2, the first fin plate FP1 is shown. The specific case of the fin plate is described below.

The heat radiation member 1 is a device for cooling a plurality of heating elements 61A, 61B, 62A, 62B, 63A, 63B (fig. 2 and 3) arranged in a first direction. The heating elements 61A, 61B, 62A, 62B, 63A, 63B (hereinafter, 61A, etc.) are, for example, power transistors of an inverter provided in a traction motor for driving wheels of a vehicle. The power transistor is, for example, an IGBT (Insulated Gate Bipolar Transistor: insulated gate bipolar transistor). In this case, the heat radiation member 1 is mounted to the traction motor. The number of the heating elements may be plural, not only six, but also one.

The heat radiation member 1 has a base portion 2 and a heat radiation fin portion 10. The heat radiation fin portion 10 includes an upstream side fin group 3, a center fin group 4, and a downstream side fin group 5.

The base portion 2 has a plate shape that expands in the first direction and the second direction and has a thickness in the third direction. The base portion 2 is made of a metal having high thermal conductivity, for example, a copper plate.

The upstream fin group 3, the center fin group 4, and the downstream fin group 5 are disposed on the third direction side of the base portion 2 in this order from the first direction other side (upstream side) to the first direction one side (downstream side). As will be described later, the fin groups 3, 4,5 are fixed to the third-direction one side surface 21 of the base portion 2 by brazing, for example.

The heating element 61A and the like are in direct or indirect contact with the other side surface 22 in the third direction of the base part 2 (fig. 2). The heat-generating elements 61A, 61B overlap the upstream-side fin group 3, the heat-generating elements 62A, 62B overlap the center fin group 4, and the heat-generating elements 63A, 63B overlap the downstream-side fin group 5 when viewed in the third direction (fig. 3).

The refrigerant W is supplied to the upstream fin group 3 from the upstream side of the upstream fin group 3, flows through the fin groups 3, 4, and 5 in this order, and is discharged from the downstream fin group 5 to the downstream side. At this time, the heat generated by the heat generating body 61A and the like moves to the refrigerant W via the base portion 2 and the fin groups 3, 4, and 5, respectively. Thereby, the heating element 61A and the like are cooled.

< 2 > Method for Forming Fin group >

Here, an example of a specific method of forming the heat radiation fin portion 10 (fin group 3, 4, 5) will be described with reference to fig. 4 and 5.

The fin groups 3,4, 5 are configured as so-called stacked fins (STACKED FIN) by arranging a plurality of fin plates FP in the second direction. The fin plate FP is constituted by a metal plate extending in the first direction, for example, by a copper plate. The fin plates FP1, FP2, FP3 shown are each one of the fin plates FP. Namely, FP is used as a collective symbol of the fin plate.

Fig. 4 is a perspective view of the first fin plate FP 1. The first fin plate FP1 has fins 30, 40, 50. The fins 30, 40, 50 constitute fin groups 3,4, 5, respectively.

As shown in fig. 4, the fin 30 has a first fin 301, a second fin 302, and a third fin 303.

The first fin 301 has a bottom plate portion 301A, a wall portion 301B, and a top plate portion 301C. The wall 301B has a plate shape that extends in the first direction and the third direction and has a thickness in the second direction. The bottom plate portion 301A is formed by bending from the end portion on the other side in the third direction to the other side in the second direction of the wall portion 301B. The top plate 301C is formed by bending from one end portion of the wall 301B in the third direction to the other side in the second direction. The top plate 301C is provided so as to be divided into one side in the first direction and the other side in the first direction of the cutout 3011 described below. The bottom plate portion 301A and the top plate portion 301C are opposed in the third direction. Thus, the first fin 301 has a コ -shaped cross section in a cross section orthogonal to the first direction.

The bottom plate portion 301A and bottom plate portions 302A and 303A described below are portions of the bottom plate portion BT extending over the entire length of the first fin plate FP1 in the first direction.

The second fin 302 is provided continuously on the first direction side of the first fin 301, and has a bottom plate portion 302A and a wall portion 302B. The wall portion 302B has a plate shape that expands in the first direction and the third direction and has a thickness direction in the second direction. The wall portion 302B is continuously provided on one side of the wall portion 301B in the first direction. The wall portion 302B has one end surface in the third direction located on the other side in the third direction than the one end surface in the third direction of the wall portion 301B.

The bottom plate portion 302A is formed by bending from the end portion on the other side in the third direction to the other side in the second direction of the wall portion 302B. Thus, the second fin 302 has an L-shaped cross section in a cross section orthogonal to the first direction.

The third fin 303 is provided continuously on the other side of the first fin 301 in the first direction, and has a bottom plate portion 303A and a wall portion 303B. The wall portion 303B has a plate shape that expands in the first direction and the third direction and has a thickness direction in the second direction. The wall portion 303B is continuously provided on the other side of the wall portion 301B in the first direction.

The bottom plate portion 303A is formed by bending from the end portion on the other side in the third direction to the other side in the second direction of the wall portion 303B. Thus, the third fin 303 has an L-shaped cross section in a cross section orthogonal to the first direction. The wall portion 303B has one end surface in the third direction located on the other side in the third direction than the one end surface in the third direction of the wall portion 301B.

The fins 40 and 50 are substantially identical in structure to the fins 30, and therefore, detailed symbols are omitted in fig. 4 for convenience.

In addition, the first fin plate FP1 has only a part of the bottom plate portion BT between the fins 30 and 40 and between the fins 40 and 50.

Fig. 5 is a perspective view of the second fin plate FP 2. The second fin plate FP2 differs from the first fin plate FP1 in structure in that it has: a connecting fin 71 connecting the fin 30 and the fin 40 in the first direction; and a connecting fin 72 connecting the fin 40 and the fin 50 in the first direction. The function of the connecting fins 71, 72 is described below.

In the second-direction other-side end region R2 (fig. 3) of the heat radiation fin portion 10, the third fin plate FP3 (fig. 1) is disposed most on the second-direction other side, and the first fin plate FP1 and the second fin plate FP2 are alternately disposed on the second-direction one side of the third fin plate FP3 in the second direction. The third fin plate FP3 has a flat plate shape extending in the first direction and the third direction, and has a thickness direction in the second direction. The third fin plate FP3 is formed in a structure in which the bottom plate portion and the top plate portion in the first fin plate FP1 are removed. The third fin plate FP3 is configured to have only through holes in the spoiler 8 described below.

In the second-direction other-side end region R2, the fin plates FP1, FP2, FP3 are arranged in the second direction, whereby a plurality of third fins 303 are arranged in the second direction at the first-direction other-side end in the second-direction other-side end region R2. Thereby, the end fin group 3A (fig. 1) is formed.

In the second-direction side end region R1 (fig. 3) in the heat radiating fin portion 10, the first fin plates FP1 and the second fin plates FP2 are alternately arranged in the second direction. In the second direction one side end region R1, the fin plates FP1, FP2 are arranged in the second direction, whereby a plurality of third fins 303 are arranged in the second direction at the first direction other side end in the second direction one side end region R1. Thereby, the end fin group 3B (fig. 1) is formed.

In the region between the second-direction one-side end region R1 and the second-direction other-side end region R2, the fin plates FP having no third fins 303 on the other side in the first direction among the fin plates FP1, FP2 are alternately arranged in the second direction. Thus, a recess 100 (fig. 1) recessed toward the other side in the third direction is formed between the end fin groups 3A, 3B.

By checking the concave portion 100, an operator can suppress an error in the mounting direction when the heat radiation member 1 is mounted. The end fin group may be formed at the first direction side end of the downstream fin group 5, but is desirably provided in the upstream fin group 3 as shown in fig. 1. By providing the concave portion 100 on the upstream side in this way, the flow path resistance on the second-direction center side when the refrigerant W flows into the fin group 3 can be reduced, and the cooling performance of the heat generating elements 61A, 61B located on the second-direction center side of the fin group 3 can be improved.

In this way, the various fin plates FP are arranged in the second direction, and are integrated by caulking or the like, for example, to form the heat radiation fin portion 10 (fin groups 3, 4, 5). The formed fin portion 10 is fixed to the third-direction one side surface 21 of the base portion 2 by brazing, for example. In this way, by configuring the heat radiation fin portion 10 by the fin plate FP having the structure in which the fins 30, 40, and 50 are integrated in the first direction, even when the thickness of the base portion 2 is made thin for heat conductivity, the rigidity of the heat radiation member can be improved, and deflection or the like caused by the flow of the refrigerant W can be suppressed.

With the above configuration, in the fin groups 3, 4, 5, the refrigerant W flows through the flow paths formed by the fins 30, 40, 50 adjacent in the second direction. At this time, the refrigerant W flows through the bottom plate portion BT. In addition, when the bottom plate portion BT is not provided to the fin plate FP, the refrigerant W flows through the base portion 2. For example, if the fins 30 are used, the refrigerant W is guided along the wall surfaces (surfaces orthogonal to the second direction) of the wall portions 303B, 301B, and 302B.

The fin group is not limited to a plurality of fin groups, and may be provided in one fin group. That is, the heat radiation member 1 has one of the plurality of fins 30, 40, 50 protruding from the base portion 2 to the third direction side and extending in the first direction, and is configured by arranging the plurality of fins in the second direction, or the plurality of fin groups 3, 4, 5 arranged in the first direction.

< 3 Spoiler >

As shown in fig. 4 and 5, the first fin plate FP1 and the second fin plate FP2 are provided with a spoiler 8. Here, the spoiler 8 will be described in detail.

As shown in fig. 4, in the first fin plate FP1, the spoiler 8 is provided to each of the fins 40 and 50. As shown in fig. 5, the second fin plate FP2 is also provided with a spoiler 8 in the same manner as the first fin plate FP 1. In fig. 5, the structure of the spoiler 8 is omitted for convenience. That is, at least any one fin 40, 50 included in at least any one fin group 4, 5 has at least one spoiler 8.

As shown in fig. 4, the spoiler 8 includes first spoilers 811, 812 and a second spoiler 82. The first spoiler 811, 812 is a spoiler 8 (Shan Raoliu) provided with only one projection described below. The second spoiler 82 is a spoiler 8 (double spoiler) provided with two protrusions described below. In the example shown in fig. 4, the first spoiler 811 is provided to the fins 40, 50, the first spoiler 812 is provided to the fin 40, and the second spoiler 82 is provided to the fin 50.

Fig. 6 is an enlarged perspective view showing the structure of the first spoiler 811. The first spoiler 811 has a through hole 8A and a protruding portion 8B. That is, the first spoiler 811 has only the protruding portion 8B as the protruding portion. The through hole 8A penetrates the wall portions of the fins 40, 50 in the second direction. The through hole 8A has a rectangular shape. The through hole 8A has a pair of opposing sides 8A1, 8A2 inclined toward one side in the first direction and the other side in the third direction. The side 8A2 is located on the other side in the first direction than the side 8 A1. The protruding portion 8B is formed by bending toward the other side in the second direction at the side 8A2. The through hole 8A and the protruding portion 8B can be formed by forming a cutout in the wall portion and bending the cutout.

The protruding portion 8B has an opposing surface SB opposing the first direction side, which is the direction in which the refrigerant W flows. The first spoiler 811 has a function of blocking the flow of the refrigerant W through the opposing surface SB. Turbulence of the refrigerant W is easily generated near the opposing surface SB, and the cooling performance of the fins 40, 50 can be improved. Further, the protruding portion 8B is inclined toward one side in the first direction and the other side in the third direction. This can guide the refrigerant W to the heating element side through the protruding portion 8B, and can improve the cooling performance.

Fig. 7 is an enlarged perspective view showing the structure of the first spoiler 812. The first spoiler 812 has a through hole 8A and a protruding portion 8C. That is, the first spoiler 811 has only the protruding portion 8C as the protruding portion. The through hole 8A penetrates the wall of the fin 40 in the second direction. The protruding portion 8C is formed by bending to the other side in the second direction at the side 8A1 of the through hole 8A. The through hole 8A and the protruding portion 8C can be formed by forming a cutout in the wall portion and bending the cutout.

The protruding portion 8C has an opposing surface SC opposing the first direction side, which is the direction in which the refrigerant W flows. The first spoiler 812 has a function of blocking the flow of the refrigerant W through the opposite surface SC. Turbulence of the refrigerant W is easily generated near the facing surface SC, and the cooling performance of the fins 40 can be improved. Further, the protruding portion 8C is inclined toward one side in the first direction and the other side in the third direction. This can guide the refrigerant W to the heating element side through the protruding portion 8C, and can improve the cooling performance.

Fig. 8 is an enlarged perspective view showing the structure of the second spoiler 82. The second spoiler 82 has a through hole 8A, a protruding portion 8B, and a protruding portion 8C. That is, the second spoiler 82 has two protruding portions.

The second spoiler 82 has a function of blocking the flow of the refrigerant W by the opposing faces SB, SC of the protruding portions 8B, 8C. Turbulence of the refrigerant W is easily generated near the opposing surfaces SB and SC, and the cooling performance of the fins 50 can be improved. The number of protruding portions of the second spoiler 82 is larger than the number of protruding portions of the first spoilers 811, 812, and therefore, the cooling performance is high.

That is, the spoiler 8 has: a through hole 8A penetrating in the second direction; and protruding portions 8B, 8C protruding from the peripheral edge of the through hole 8A in the second direction and including opposing surfaces SB, SC opposing the downstream side in the flow direction of the refrigerant W, that is, the first direction side.

In the example shown in fig. 4, a first spoiler 811, a first spoiler 812, and a first spoiler 811 are arranged in this order on the fin 40 toward the first direction side. The fin 50 is provided with a second spoiler 82, a first spoiler 811, a second spoiler 82, and a first spoiler 811 in this order toward the first direction side. That is, a plurality of (seven) spoilers 8 are provided in the first direction on the fins 40, 50 at the same second direction position.

The spoiler 8 provided to the fins 40, 50 includes first spoilers 811, 812. The first spoiler 811, 812 has only one protrusion. That is, at least one of the plurality of spoilers 8 has the protruding portions 8B, 8C continuously provided along a part of the entire circumference of the through hole 8A.

According to the present embodiment described above, since the spoiler 8 having the protrusions 8B and 8C including the facing surfaces SB and SC is provided in plural numbers, the turbulence generating portions can be increased, and the cooling performance can be improved. Further, at least one of the plurality of spoilers 8 has the protruding portions 8B, 8C (the first spoilers 811, 812) continuously provided along a part of the entire circumference of the through hole 8A, and therefore, the pressure loss can be reduced. By reducing the pressure loss, a small and inexpensive pump for circulating the refrigerant W can be used, and the manufacturing cost of the product can be suppressed.

The through hole 8A has a rectangular shape, and the protruding portions 8B and 8C, which are continuously provided along a part of the entire circumference of the through hole 8A, are provided on one of a pair of opposite sides 8A1 and 8A2 of the through hole 8A, which are opposite to each other. Thereby, the protruding portions 8B, 8C can be easily formed. The through hole 8A is not limited to a rectangular shape, and for example, a side other than the pair of sides 8A1 and 8A2 may be curved, or may be circular.

Further, the plurality of spoilers 8 include: first spoilers 811 and 812 having protruding portions 8B and 8C provided continuously along a part of the entire circumference of the through hole 8A; and a second spoiler 82 having a pair of protrusions 8B, 8C disposed discontinuously along a part of the entire circumference of the through hole 8A and facing each other. That is, the first spoilers 811, 812 (Shan Raoliu) having only one protruding portion and the second spoilers 82 (double spoilers) having two protruding portions are mixed. Thereby, the cooling performance can be improved by the second spoiler 82, and the pressure loss can be reduced by the first spoilers 811, 812.

In particular, as shown in fig. 4, three first spoilers are provided in the fin 40 so that the number of protruding portions of the spoiler 8 is three, and two first spoilers and two second spoilers are provided in the fin 50 disposed on the downstream side of the fin 40 so that the number of protruding portions of the spoiler 8 is six. This is because the temperature of the refrigerant W tends to be high on the downstream side of the fins 50, and cooling performance is more required. This can suppress the temperature difference between the heating elements 62A, 62B, 63A, 63B (fig. 2) disposed from the upstream side to the downstream side. On the other hand, in the fin 40 on the upstream side, the increase in pressure loss due to unnecessary cooling is suppressed by reducing the number of protruding portions.

In addition, at the fin 30 located at the most upstream side, cooling performance is not required as compared to the fins 40, 50, and therefore, the spoiler 8 is not provided. That is, in the fin 30, the number of protruding portions is zero. However, the fin 30 may be provided with the spoiler 8. In this case, for example, the number of protruding pieces in the fins 30, 40, 50 may be one, three, six, or the like. For example, the number of protruding pieces in the fins 30, 40, 50 may be zero, four, or the like, and the number may be the same on the downstream side.

That is, the number of protruding portions included in each of the fins 30, 40, 50 at the same second direction position in the plurality of fin groups 3, 4,5 increases toward the first direction side. By adjusting the number of protruding portions when the first turbulators 811, 812 and the second turbulator 82 are mixed, the cooling performance on the downstream side, which requires more cooling performance, can be improved, the temperature difference of the heating elements arranged along the first direction can be suppressed, and the pressure loss increase due to unnecessary cooling on the upstream side can be suppressed.

The first spoilers 811 and 812 and the second spoilers 82 do not have to be mixed, and all the spoilers 8 may be the first spoilers 811 and 812. That is, the plurality of spoilers 8 may be all first spoilers 811 and 812 having the protruding portions 8B and 8C continuously provided along a part of the entire circumference of the through-hole 8A. This can further reduce the pressure loss. In this case, it is desirable to adjust the number of protruding portions as described above.

Further, as shown in fig. 2, the spoiler 8 on the downstream side of the two spoilers 8 (811, 812) overlapping the heat generating body 62B in the third direction as viewed in the second direction is the first spoiler 811. Similarly, the spoiler 8 on the downstream side of the two spoilers 8 (82, 811) overlapping the heat generating body 63A in the third direction as viewed in the second direction is the first spoiler 811, and the spoiler 8 on the downstream side of the two spoilers 8 (82, 811) overlapping the heat generating body 63B in the third direction as viewed in the second direction is the first spoiler 811.

That is, the first spoiler 811 on the first-direction-side most among the plurality of spoilers 8 overlapping the same heat generating body 62B in the third direction as viewed in the second direction is provided with the protruding portion 8B (fig. 6) on the side 8A2 on the other side in the first direction among the pair of sides. Since the necessity of guiding the refrigerant W toward the base portion 2 is low on the downstream side of the heat generating element 62B, the protruding portion 8B is provided on the side 8A2 located on the other side (upstream side) in the first direction from among the pair of sides 8A1 and 8A2 of the rectangular through hole 8A among the first turbulators 811 on the most downstream side among the plurality of turbulators 8.

As shown in an example in fig. 9, in the second spoiler 82, the length LB of the protruding portion 8B along the side 8A1 may be different from the length LC of the protruding portion 8C along the side 8 A2. That is, the lengths along the peripheral edge of the pair of protruding portions 8B, 8C in the second spoiler 82 are different. This enables the pressure loss to be adjusted more finely.

< 4 Downstream side Fin >)

Next, the second fins 302 and 402 disposed on the downstream side of the fins 30 and 40 will be described in more detail. Here, the second fin 302 is described as an example with reference to fig. 10, but the content of the second fin 402 is the same.

Fig. 10 is a partially enlarged view showing a structure in the vicinity between the upstream side fin group 3 and the center fin group 4. As shown in fig. 10, the second fins 302 of the fin plates FP1, FP2 are arranged in plurality in the second direction. The third fins 403 of the fin plates FP1, FP2 are arranged in plurality in the second direction.

As shown in fig. 10, in the second fin plate FP2, the connection fin 71 is formed between the second fin 302 and the third fin 403, and a space is formed on the third direction side of the connection fin 71. In the first fin plate FP1, a space is formed between the second fin 302 and the third fin 403 without forming a connecting fin. The groove S is formed by the space formed as described above. The grooves S provide an effect of preventing growth of the boundary layer of the fins and improving cooling performance, an effect of mixing the refrigerant W discharged from the downstream outlet of the fin group 3, and an effect of reducing pressure loss. The boundary layer is a region where the velocity of the refrigerant W in the vicinity of the fins is small due to the effect of viscosity when the refrigerant W flows along the fins. Further, by providing the connection fins 71, the rigidity of the heat radiation member 1 can be improved, and the contact area with the refrigerant W in the groove S can be increased, thereby improving the cooling performance.

Here, as shown in fig. 3, since both ends in the second direction of the heating elements 61A and 61B are disposed toward the second direction center side, the heat transfer to the refrigerant W1 flowing through both ends in the second direction of the fin group 3 is small, and the temperature of the refrigerant W1 is relatively low. In contrast, the heat transfer to the refrigerant W2 flowing through the center side in the second direction of the fin group 3 increases, and the temperature of the refrigerant W2 is relatively high. However, as described above, at the downstream-side outlet of the fin group 3, mixing of the refrigerants W1 and W2 is promoted. This promotes the temperature uniformity of the refrigerant W, and improves the cooling performance in the fin group 4 on the rear stage side.

As shown in fig. 10, one end of the connecting fin 71 in the third direction is provided with a recess 71A recessed toward the other side in the third direction. In the second fin plate FP2, similarly, as shown in fig. 5, the connecting fins 72 of the connecting fins 40 and 50 are provided with concave portions 72A.

That is, the heat radiation member 1 has connection fins (71, 72) that connect at least any one fin (30, 40) (40, 50) of the same second direction position in at least any one fin group (3, 4) (4, 5) adjacent in the first direction to each other in the first direction. Recesses (71A, 72A) recessed toward the other side in the third direction are provided at one end of the connecting fins (71, 72) in the third direction.

The provision of the connection fins 71 and 72 can improve the rigidity of the heat radiation member 1 and the cooling performance due to the increase in the contact area with the refrigerant W, but the necessity of cooling performance is low in a portion distant from each of the heat generating elements (61B, 62A) (62B, 63A) of the fin groups (3, 4) (4, 5) disposed adjacent to each other in the first direction, and therefore, the concave portions 71A, 72A can be provided in the connection fins 71, 72. By providing the concave portions 71A and 72A, the effect of preventing the growth of the boundary layer of the connecting fins 71 and 72 and improving the cooling performance and the effect of mixing the refrigerant W to uniformize the temperature of the refrigerant W can be exerted.

< 5 > Notched portions of fins

As shown in fig. 4, in the first fin plate FP1, the first fins 301, 401, 501 of the fins 30, 40, 50 are provided with notched portions 3011, 4011, 5011 notched from one end portion in the third direction to the other side in the third direction. The second fin plate FP2 (fig. 5) and the third fin plate FP3 (fig. 1) are also provided with notched portions. As shown in fig. 2, the notch 3011 is arranged between the heating elements 61A and 61B in the first direction when viewed in the second direction, the notch 4011 is arranged between the heating elements 62A and 62B in the first direction when viewed in the second direction, and the notch 5011 is arranged between the heating elements 63A and 63B in the first direction when viewed in the second direction.

That is, at least one end portion in the third direction of at least one fin 30, 40, 50 of at least one fin group 3, 4, 5 is provided with a notch 3011, 4011, 5011 which cuts a notch to the other side in the third direction at a position intermediate in the first direction. Since the necessity of cooling performance is low between the two heat generators (61A, 61B) (62A, 62B) (63A, 63B) arranged in the first direction, the notched portions 3011, 4011, 5011 can be provided at this position to reduce the contact area of the fins 30, 40, 50 with the refrigerant W. Further, by providing the notched portions 3011, 4011, 5011, the effect of preventing the growth of the boundary layers of the fins 30, 40, 50 and improving the cooling performance and the effect of mixing the refrigerant W to uniformize the temperature of the refrigerant W can be exerted.

<6 > Height adjustment of fins >

The fin groups 3,4, 5 are housed in a liquid cooling jacket, and the refrigerant W flows inside the liquid cooling jacket. Fig. 11 is a side view of the heat radiation member 1 in the second direction side with the third fin plate FP3 removed, as in fig. 2. In the upper and lower sections of fig. 11, the third direction heights of the fins 30, 40, 50 are different. Furthermore, fig. 11 shows the top surface 9 of the liquid jacket.

In the upper stage of fig. 11, the third-direction height of the fins 30, 40, 50 is defined as a height HF1, and the height from the base portion 2 to the top surface 9 is defined as a height HW. In the lower stage of fig. 11, the height from the base portion 2 to the top surface 9 is set to the same height HW as in the upper stage of fig. 11, and the third-direction height of the fins 30, 40, 50 is set to the height HF2, which is lower than the height HF 1.

In this way, by adjusting the third-direction height of the fins 30, 40, 50, the gap between the fins 30, 40, 50 and the top surface 9 can be expanded from the gap Sp1 to the gap Sp2. Therefore, the refrigerant W easily flows through the gap, and as a result, the pressure loss can be reduced.

In general, the pressure loss can be estimated by fluid simulation, but when the fin and the liquid cooling jacket are manufactured and actually measured, the actually measured pressure loss may be higher than the pressure loss assumed by simulation. In this case, when the liquid cooling jacket is formed by die casting, the correction mold is changed in a large scale, and therefore, it is a relatively easy means to adjust the fin height to be low. That is, if the fin height is made low, the cooling performance is also reduced, but in the case where this is allowed, it is sufficient to prepare a fin whose pressure loss amount is adjusted to fall within a desired range by reducing the fin height.

< 7. Other >

The embodiments of the present disclosure have been described above. The scope of the present disclosure is not limited to the above embodiments. The present disclosure can be implemented with various modifications added to the above-described embodiments without departing from the gist of the present disclosure. The matters described in the above embodiments can be appropriately combined in any range where no contradiction occurs.

For example, a vapor chamber or a heat pipe may be provided between the heat generating body and the heat radiating member.

The present disclosure can be used for cooling various heating elements.

(Symbol description)

1 Heat dissipation member

2 Base part

3 Upstream side fin group

3A, 3B end fin group

4 Central Fin group

5 Downstream side fin group

8 Spoiler

8A through hole

8A1 and 8A2 sides

8B, 8C protruding portion

9 Top surface

10 Radiating fin parts

21 Third direction one side

22 Third direction another side

30. 40, 50 Fins

61A, 61B, 62A, 62B, 63A, 63B heating elements

71. 72 Connecting fins

71A, 72A recess

82 Second spoiler

100 Concave parts

301. 401, 501 First fin

301A floor portion

301B wall portion

301C top plate

302 Second fin

302A bottom plate portion

302B wall portion

303 Third fin

303A bottom plate portion

303B wall portion

402 Second fin

403 Third fin

811. 812 First spoiler

3011. 4011, 5011 Incision portion

BT floor part

FP1 first Fin plate

FP2 second Fin plate

FP3 third fin plate

R1 second direction one side end region

R2 second direction other side end region

S groove

SB, SC opposite surface

W refrigerant.

Claims

1. A heat radiation member, comprising:

A plate-shaped base portion that expands in a first direction along a direction in which the refrigerant flows and in a second direction orthogonal to the first direction, and that has a thickness in a third direction orthogonal to the first direction and the second direction; and

One fin group formed by arranging a plurality of fins extending in the first direction and protruding from the base portion toward the third direction side in the second direction, or a plurality of fin groups arranged in the first direction,

At least any one of the fins included in at least any one of the fin groups has at least one spoiler,

The spoiler has:

A through hole penetrating in the second direction; and

A protruding portion protruding from a peripheral edge of the through hole in a second direction and including an opposing surface opposing a downstream side of the flow direction of the refrigerant, that is, a side of the first direction,

A plurality of spoilers are arranged on the fins at the same second direction position along the first direction,

At least one of the plurality of spoilers has the projection continuously provided along a portion of the entire circumference of the through-hole.

2. The heat dissipating member of claim 1,

The through hole is rectangular in shape,

The protruding portion provided continuously along a part of the entire circumference of the through hole is provided on one of a pair of opposite sides of the through hole facing each other.

3. The heat dissipating member of claim 2,

Among the plurality of spoilers which overlap with the same heat generating body in the third direction as viewed in the second direction, the one closest to the first direction is provided with the protruding portion on the other side in the first direction among the pair of sides.

4. A heat dissipating member according to any one of claims 1 to 3,

Having a connecting fin connecting at least any one of the fins of at least any one of the fin groups adjacent in the first direction at the same second direction position with each other in the first direction,

The connecting fin has a recess recessed toward the other side in the third direction at one end in the third direction.

5. The heat dissipating member of any one of claims 1 to 4,

The plurality of spoilers includes:

A first spoiler having the protruding portion continuously provided along a part of the entire circumference of the through hole; and

And a second spoiler having a pair of the protruding portions discontinuously provided along a part of the entire circumference of the through hole and facing each other.

6. The heat dissipating member of any one of claims 1 to 4,

The plurality of spoilers are all first spoilers having the protruding portion continuously provided along a part of the entire circumference of the through-hole.

7. The heat dissipating member of claim 5 or 6,

The number of the protruding portions included in each of the fins at the same second direction position in the plurality of fin groups is larger toward the first direction side.

8. The heat dissipating member of any one of claims 1 to 7,

The third direction one side end of at least any one of the fins in at least any one of the fin groups is provided with a notch portion which cuts a notch to the other side in the third direction at the first direction intermediate position.

9. The heat dissipating member of claim 5,

The pair of protrusions in the second spoiler are different in length along the peripheral edge.