JP2022179285A - Heat radiation member - Google Patents

Abstract

To provide a heat radiation member which suppresses a temperature difference between heating elements when a plurality of heating elements are aligned in a direction where a coolant flows.SOLUTION: A heat radiation member 1 comprises: a plate-shaped base part 2 which extends in a first direction along a direction in which a coolant flows and in a second direction orthogonal to the first direction, and has a thickness in a third direction orthogonal to the first and second directions; and a plurality of fin groups 3-5, 3A, 3B which protrude from the base part to one side in the third direction and are arranged side by side in the first direction, with a plurality of fins 30-50 which extend in the first direction arranged in the second direction. At least any of the fins included in at least any of the fin groups has a spoiler 7 having a facing surface that faces one side in the first direction which is downstream in the direction in which the coolant flows. The number of spoilers included in the fins at the same position in the second direction in the plurality of fin groups becomes larger as the fins are nearer to one side in the first direction.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to heat dissipation members.

Conventionally, a heat radiating member is used for cooling a heat generating element. The heat dissipation member has a base portion and a plurality of fins. A plurality of fins protrude from the base portion. When a coolant such as water flows between adjacent fins in a plurality of fins, the heat of the heating element is transferred to the coolant (see, for example, Patent Document 1).

Chinese Patent Application Publication No. 106546116

In conventional heat dissipating members, when a plurality of heat generating elements are arranged in the direction in which the coolant flows, the temperature difference between the heat generating elements becomes a problem because the temperature of the coolant increases due to heat transfer toward the downstream side.

In view of the above circumstances, an object of the present disclosure is to provide a heat radiating member capable of suppressing a temperature difference between heating elements.

An exemplary heat dissipating member of the present disclosure extends in a first direction along a direction in which a coolant flows and a second direction orthogonal to the first direction, and has a thickness in a third direction orthogonal to the first direction and the second direction. A plate-shaped base portion and a plurality of fins projecting from the base portion to one side in the third direction and extending in the first direction are arranged in the second direction, and a plurality of fins are arranged in the first direction. and a group of fins. At least one of the fins included in at least one of the fin groups has a spoiler having a facing surface facing one side in the first direction, which is the downstream side in the direction in which the coolant flows. The number of spoilers included in each of the fins at the same position in the second direction in the plurality of fin groups increases toward one side in the first direction.

Exemplary heat dissipating members of the present disclosure can reduce temperature differences between heating elements.

1 is a perspective view of a heat dissipation member according to an exemplary embodiment of the present disclosure; FIG. FIG. 2 is a side view of the heat dissipating member viewed from one side in the second direction. FIG. 3 is a plan view of the heat radiating member as viewed from one side in the third direction. FIG. 4 is a partially enlarged view of an upstream fin group in the heat radiating member. FIG. 5 is a partially enlarged view showing the configuration of the vicinity between the upstream fin group and the central fin group. FIG. 6 is a diagram schematically showing the flow of coolant near the second fins. FIG. 7 is a partially enlarged view showing the configuration near the end fin group in the upstream fin group. FIG. 8 is a diagram schematically showing the flow of coolant near the third fins. FIG. 9 is a partially enlarged view showing the configuration of the vicinity between the upstream fin group and the central fin group. FIG. 10 is a side view of the central fin group. FIG. 11 is a perspective view showing a configuration example of a spoiler. FIG. 12 is a side view showing a modification of the number of spoilers arranged. FIG. 13 is a side view showing a modification of the number of spoilers arranged. FIG. 14 is a side view of the downstream fin group. FIG. 15 is a side view of the downstream fin group. FIG. 16 is a side view of the central fin group. FIG. 17 is a side cross-sectional view showing gaps between the spoiler, the bottom plate portion, and the top plate portion. FIG. 18 is a side view showing an example in which the spoiler is provided with a bottom recess. FIG. 19 is a perspective view showing an example of a fin provided with bottom recesses. FIG. 20 is a diagram showing an example of the bottom recessed portion and the spoiler viewed in the third direction. FIG. 21 is a diagram showing a first form of the positional relationship between the spoiler and the bottom recess. FIG. 22 is a diagram showing a second form of the positional relationship between the spoiler and the bottom recess. FIG. 23 is a diagram showing a third form of the positional relationship between the spoiler and the bottom recess. FIG. 24 is a diagram showing a fourth form of the positional relationship between the spoiler and the bottom recess. FIG. 25 is a diagram showing a fifth form of the positional relationship between the spoiler and the bottom recess. FIG. 26 is a side cross-sectional view showing an example of a spoiler with an inclination angle close to vertical. FIG. 27 is a side sectional view showing an example in which notches are provided in the bottom plate portion and the top plate portion. FIG. 28 is a side view showing an example in which the base portion is provided with a bottom recessed portion.

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

In the drawings, the first direction is the X direction, X1 is one side of the first direction, and X2 is the other side of the first direction. The first direction is along the direction F in which the coolant W flows, indicated as F1 for the downstream side and F2 for the upstream side. A second direction orthogonal to the first direction is defined as the Y direction, Y1 is defined as one side of the second direction, and Y2 is defined as the other side of the second direction. A third direction orthogonal to the first direction and the second direction is the Z direction, Z1 is one side of the third direction, and Z2 is the other side of the third direction. It should be noted that the term “perpendicular” also includes crossing at an angle slightly deviated from 90 degrees. Moreover, each direction described above does not limit the direction when the heat radiating member 1 is incorporated in various devices.

<1. Overall Configuration of Heat Dissipating Member>
FIG. 1 is a perspective view of a heat dissipation member 1 according to an exemplary embodiment of the present disclosure. FIG. 2 is a side view of the heat radiating member 1 as seen from one side in the second direction. FIG. 3 is a plan view of the heat radiating member 1 as viewed from one side in the third direction.

The heat radiating member 1 is a device that cools a plurality of heating elements 6A, 6B, 6C (FIGS. 2 and 3) arranged in the first direction. The heating elements 6A, 6B, 6C are, for example, power transistors of inverters provided in traction motors for driving wheels of a vehicle. The power transistor is, for example, an IGBT (Insulated Gate Bipolar Transistor). In this case, the heat radiating member 1 is mounted on the traction motor. Note that the number of heating elements may be a plurality other than three.

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

The base portion 2 has a plate shape that extends 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, such as a copper plate.

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

The heating elements 6A, 6B, 6C are in direct or indirect contact with the third direction other side surface 22 of the base portion 2 (FIG. 2). When viewed in the third direction, the heating elements 6A, 6B, 6C overlap the fin groups 3, 4, 5, respectively (Fig. 3).

As the coolant W is supplied to the upstream fin group 3 from the upstream side of the upstream fin group 3, the coolant W flows through the fin groups 3, 4, and 5 in order and is discharged from the downstream fin group 5 to the downstream side. be done. At this time, the heat generated from the heating elements 6A, 6B, 6C moves to the coolant W via the base portion 2 and the fin groups 3, 4, 5, respectively. Thereby, the heating elements 6A, 6B, 6C are cooled.

<2. Method for Forming Fin Group>
Here, an example of a specific method of forming the radiating fin portion 10 (fin groups 3, 4, 5) will be described with reference to FIG. 4 as well. FIG. 4 is a partially enlarged view of the upstream fin group 3 in the heat radiating member 1. As shown in FIG.

The fin groups 3, 4, and 5 are configured as so-called stacked fins by arranging a plurality of fin plates FP in the second direction. The fin plate FP is composed of a metal plate extending in the first direction, for example, a copper plate. The illustrated fin plates FP1, FP2, FP3, FP4, FP5, and FP6 are all one kind of fin plates FP. That is, FP is used as a generic code for fin plates.

In FIG. 4, for understanding of the fin plate FP, the fin plate FP located on the other side in the second direction is indicated by hatching. The fin plate FP has fins 30,40,50. Fins 40 and 50 are shown in FIG. Fins 30, 40 and 50 constitute fin groups 3, 4 and 5, respectively.

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

The first fin 301 has a bottom plate portion 301A, a wall portion 301B, and a top plate portion 301C. The wall portion 301B has a plate shape extending in the first direction and the third direction and having the second direction as the thickness direction. The bottom plate portion 301A is formed by bending from the end portion of the wall portion 301B on the other side in the third direction toward the one side in the second direction. The top plate portion 301C is formed by bending the wall portion 301B from the one side end portion in the third direction toward the one side in the second direction. The bottom plate portion 301A and the top plate portion 301C face each other in the third direction. As a result, the first fin 301 has a U-shaped cross section on a cross section orthogonal to the first direction.

Note that the bottom plate portion 301A and bottom plate portions 302A and 303A, which will be described later, are part of the bottom plate portion BT that extends over the entire length of the fin plate FP in the first direction.

The second fin 302 is arranged continuously on one side of the first fin 301 in the first direction, and has a bottom plate portion 302A and a wall portion 302B. The wall portion 302B has a plate shape extending in the first direction and the third direction and having the second direction as the thickness direction. The wall portion 302B is continuous with the wall portion 301B on one side in the first direction. The position of the end surface of the wall portion 302B on the one side in the third direction is on the other side in the third direction with respect to the end surface of the wall portion 301B on the one side in the third direction.

The bottom plate portion 302A is formed by bending the end portion of the wall portion 302B on the other side in the third direction toward the one side in the second direction. Thereby, the second fin 302 has an L-shaped cross section in a cross section perpendicular to the first direction. Note that the functions of the second fins 302 and the like will be described later.

The third fin 303 is continuous with the first fin 301 on the other side in the first direction, and has a bottom plate portion 303A, a wall portion 303B, and a top plate portion 303C. The wall portion 303B has a plate shape extending in the first direction and the third direction and having the second direction as the thickness direction. The wall portion 303B is connected to the other side of the wall portion 301B in the first direction.

The bottom plate portion 303A is formed by bending the end portion of the wall portion 303B on the other side in the third direction toward the one side in the second direction. The top plate portion 303C is formed by bending the wall portion 303B from the one side end portion in the third direction toward the one side in the second direction. The bottom plate portion 303A and the top plate portion 303C face each other in the third direction. As a result, the third fin 303 has a U-shaped cross section on a cross section orthogonal to the first direction. The position of the third direction one side end face of the top plate portion 303C is on the third direction other side of the position of the third direction one side end face of the wall portion 301B. Functions of the third fin 303 and the like will be described later.

The fin 40 has a first fin 401, a second fin 402, and a third fin 403, and is configured similarly to the fin 30 (FIG. 1). Further, the fin 50 has a first fin 501, a second fin 502, and a third fin 503, and is configured similarly to the fin 30 (FIG. 1).

The fin plate FP (FP1) hatched in FIG. 4 has only a portion of the bottom plate portion BT between the fins 30 and 40 and between the fins 40 and 50. As shown in FIG. Further, as shown in FIG. 4, some fin plates FP have connecting fins CF in addition to part of the bottom plate portion BT between the fins 30 and 40 and between the fins 40 and 50 (fins Plate FP2). The connecting fin CF connects the wall portion on the other side in the first direction (eg 302A) and the wall portion on the one side in the first direction (eg 403A (FIG. 4)) in the first direction.

In the second direction other side end region R2 (FIG. 3) of the heat dissipating fin portion 10, a fin plate FP (type 1 fin plate FP1) having no connecting fins CF as described above and a fin having connecting fins CF are provided. The plates FP (second type fin plates FP2) are alternately arranged in the second direction. In addition, as shown in FIG. 4, at the second direction one side end portion in the second direction other side end region R2, the third fin 303 has a fin plate FP (third type fin plate FP3) having only the wall portion 303B. is placed. By arranging the fin plates FP1, FP2, and FP3 in the second direction in the second direction other side end region R2, the third fins 303 are arranged in the first direction other side end portion of the second direction other side end region R2. are arranged in the second direction. This forms the end fin group 3A (FIG. 4).

Further, in the second direction one side end region R1 (FIG. 3) of the heat dissipation fin portion 10, the fin plates FP1 and FP2 are alternately arranged in the second direction. At the second direction one side end portion of the second direction one side end region R1, a flat plate-shaped fin plate FP4 (fourth fin plate) is placed (Fig. 3).

By arranging the fin plates FP1, FP2, and FP4 in the second direction in the second direction one side end region R1, the third fins 303 are arranged in the first direction other side end in the second direction one side end region R1. are arranged in the second direction. This forms the end fin group 3B (FIG. 1).

In the region between the second direction one side end region R1 and the second direction other side end region R2, the fin plate FP5 that does not have the third fin 303 on the other side in the first direction in the fin plates FP1 and FP2 , 6 (5th and 6th fin plates) are alternately arranged in the second direction (FIG. 4). As a result, a recessed portion 100 recessed toward the other side in the third direction is formed between the end fin groups 3A and 3B (FIG. 1).

In this way, various fin plates FP are arranged in the second direction and integrated by, for example, caulking to form the heat radiation fin portion 10 (fin groups 3, 4, 5). The formed heat radiation fin portion 10 is fixed to the third direction one side surface 21 of the base portion 2 by, for example, brazing. In this way, by configuring the heat radiation fin portion 10 using the fin plate FP having the configuration in which the fins 30, 40, and 50 are integrated in the first direction, the thickness of the base portion 2 can be reduced for thermal conductivity. Even in such a case, the rigidity of the heat radiating member 1 can be increased, and deflection due to the flow of the coolant W can be suppressed.

With such a configuration, in the fin groups 3, 4, and 5, the coolant W flows through the channels formed by the fins 30, 40, and 50 adjacent in the second direction. At this time, the coolant W flows over the bottom plate portion BT. In addition, when the bottom plate portion BT is not provided on the fin plate FP, the coolant W flows over the base portion 2 . In the case of the fins 30, for example, the coolant W is guided along the wall surfaces (surfaces orthogonal to the second direction) of the wall portions 303B, 301B, and 302B.

That is, the heat dissipating member 1 protrudes from the base portion 2 to one side in the third direction, extends in the first direction, and is arranged in a plurality in the second direction. 40, 50.

Further, the heat dissipating member 1 is configured by arranging a plurality of fins 30, 40, 50 projecting from the base portion 2 to one side in the third direction and extending in the first direction in the second direction, and arranged side by side in the first direction. It has a plurality of fin groups 3, 4, 5 which are connected to each other.

<3. Downstream Fin and Upstream Fin>
Next, in the fins 30, 40, the second fins 302, 402 arranged on the downstream side will be described more specifically. Here, the second fin 302 will be described as an example with reference to FIGS. 5 and 6, but the contents of the second fin 402 are the same.

FIG. 5 is a partially enlarged view showing the configuration of the vicinity between the upstream fin group 3 and the central fin group 4. As shown in FIG. As shown in FIG. 5, a plurality of second fins 302 are arranged in the second direction. The position of the end of the second fin 302 in the third direction is the one side in the third direction of the flow path FP formed between the first fin 301 and the fin 30 adjacent to the first fin 301 in the second direction. It is positioned on the other side in the third direction from the end.

Here, FIG. 6 is a diagram schematically showing the flow of the coolant W near the second fins 302. As shown in FIG. The left side of FIG. 6 is a side view viewed in the second direction, and the right side of FIG. 6 is a plan view viewed in the third direction. The coolant W that has flowed through the flow path FP in this way can flow into a portion of the second fin 302 on one side in the third direction. Occurs at boundaries. Therefore, mixing of the coolant W in the vicinity of the one side of the second fin 302 in the third direction is promoted.

Here, as shown in FIG. 3, both ends of the heating element 6A in the second direction are arranged closer to the center in the second direction. is small, and the temperature of the coolant W1 is relatively low. On the other hand, heat transfer to the coolant W2 flowing in the second direction center side of the fin group 3 increases, and the temperature of the coolant W2 is relatively high. However, as described above, mixing of the refrigerants W1 and W2 is promoted at the downstream outlet of the fin group 3 . As a result, the uniformity of the temperature of the coolant W is promoted, and the cooling performance of the fin group 4 on the rear stage side can be improved.

Further, as shown in FIG. 5, a connecting fin CF is formed between the second fin 302 and the fin 40 in the fin group 4 on the rear side, and a space is provided on one side of the connecting fin CF in the third direction. It is formed. Alternatively, a space is formed between the second fin 302 and the rear-stage fin 40 without forming the connecting fin CF. A slot S is formed by the space formed as described above. The slot S has the effect of stopping the growth of the boundary layer in the fins to improve the cooling performance, the effect of mixing the coolant W discharged from the downstream outlet of the fin group 3, and the effect of reducing the pressure loss. By providing the connecting fins CF, it is possible to improve the rigidity of the heat radiating member 1 and increase the contact area with the coolant W in the slots S, thereby improving the cooling performance.

In addition, as shown in FIG. 6, the coolant W flows from the second fin 302 on one side in the third direction toward the connecting fin CF or the bottom plate portion BT, and the coolant W flowing along the second fin 302 flows into the connecting fin CF or the bottom plate portion BT in the third direction, a vortex V2 is generated. Mixing of the coolant W in the slot S is promoted by such a vortex V2. Therefore, the temperature of the coolant W is made more uniform, and the cooling performance of the fin group 4 on the rear side can be improved.

In addition, since the second fins 302 increase the turbulent flow generation effect as described above, when the coolant W flows into the fin group 4 on the rear stage side due to the influence of the turbulent flow, the growth of the boundary layer is suppressed and the cooling performance is improved. can also be improved.

Next, in the fins 30, 40, 50, the third fins 303, 403, 503 arranged on the upstream side will be described more specifically.

FIG. 7 is a partially enlarged view showing the configuration near the end fin group 3A in the upstream fin group 3. As shown in FIG. The position of the third direction one side end of the third fin 303 is on the third direction other side of the position of the third direction one side end of the flow path FP formed on both sides of the first fin 301 in the second direction.

Here, FIG. 8 is a diagram schematically showing the flow of the coolant W near the third fins 303. As shown in FIG. The left side of FIG. 8 is a side view viewed in the second direction, and the right side of FIG. 8 is a plan view viewed in the third direction. As the coolant W flowing over the base portion 2 flows into both sides of the third fin 303 in the second direction, a vortex V11 is generated near the end of the third fin 303 on the other side in the first direction. In addition, the coolant W that has flowed over the third fins 303 flows into both sides of the first fins 301 in the second direction, thereby generating a vortex V12 near the end of the first fins 301 on the other side in the first direction. Further, since the coolant W that has flowed over the base portion 2 flows into the end portion of the third fin 303 on the one side in the third direction on the other side in the first direction, a vortex V13 is generated.

In this way, the provision of the third fins 303 enhances the turbulent flow generation effect, delays the rectification of the coolant W that has flowed into the fin group 3, and suppresses the growth of the boundary layer, thereby improving the cooling performance. can. Note that the effect of generating turbulence by the third fins 303 is higher than the effect by the second fins 302 .

FIG. 9 is a partially enlarged view showing the configuration of the vicinity between the upstream fin group 3 and the central fin group 4. As shown in FIG. By providing the third fin 403 in the fin group 4 shown in FIG. Eddies V12 and V13 are generated on one side in the third direction. As a result, the effect of generating turbulent flow is increased, and the cooling performance of the coolant W that has flowed into the fin group 4 is improved. The third fin 503 in the fin 50 also has the same effect.

Any one of the fins 30, 40, 50 may not have the second fin and the third fin. Also, any one of the fins 30, 40, 50 may have only one of the second fin and the third fin.

That is, at least one of the fins 30 has the first fin 301 in this embodiment. At least one of the fins 30 described above is continuously provided on one side of the first fin 301 in the first direction, and is formed between the first fin 301 and the fin 30 adjacent to the first fin 301 in the second direction. A second fin 302 having a third direction one side end on the third direction other side than the third direction one side end of the flow path FP, and a second fin 302 connected to the first direction other side of the first fin 301 to provide the flow path and a third fin 303 having a third direction one side end on the other side in the third direction with respect to the third direction one side end of the FP.

Also, at least one of the fins 30 has a second fin 302 . A gap in the first direction is formed between the second fin 302 and the rear fin 40 arranged on one side of the second fin 302 in the first direction.

Further, the heat dissipation member 1 has connecting fins CF connecting at least one of the second fins 302 and the rear fins 40 in the first direction.

<4. Reclining shape>
Here, FIG. 10 is a side view of the central fin group 4. FIG. As shown in FIG. 10, the first direction length L3 of the third fin 403 is longer than the first direction length L2 of the second fin 402 . Refrigerant WU that is not heat-exchanged flows from one side of the third fin 403 in the third direction into the flow path formed by the fins 40, so that the cooling performance peaks as indicated by the dashed isotherm line in FIG. is downstream of the center of the fin 40 in the first direction. Therefore, it is possible to improve the downstream cooling performance of the heating element 6B. It should be noted that the effect of this configuration is the same for the downstream fin group 5 as well.

<5. End fin group>
As described above, the end fin groups 3A and 3B are configured in the radiation fin portion 10 . Note that, on the downstream side of the downstream fin group 5 , the second fins 502 may form end fin groups at both ends in the second direction.

That is, the heat radiating member 1 is formed by a plurality of second fins 502 or third fins 303 adjacent to each other in the second direction. with end fins located in the . A recessed portion 100 recessed toward the other side in the third direction is formed between the end fin groups. As a result, by checking the concave portion 100, the operator can prevent a mistake in the mounting direction when mounting the heat radiating member 1. As shown in FIG.

It is more desirable that the end fin group be formed in the upstream fin group 3 . That is, the end fin groups 3A and 3B are composed of the third fins 303, and the fin group 3 is arranged closest to the other side in the first direction among the fin groups 3, 4 and 5 arranged in the first direction. be. As a result, by providing the concave portion 100 on the upstream side, the flow path resistance on the second direction center side when the coolant W flows into the fin group 3 is reduced, and the heat generation located on the second direction center side in the fin group 3 is reduced. The cooling performance of the body 6A can be improved.

In other words, at the first direction other side end of the fin group 3 arranged closest to the other side in the first direction, or at the first direction one side of the fin group 5 arranged closest to the one side in the first direction The side ends have end fin groups 3A and 3B arranged at both ends in the second direction, and recesses 100 recessed toward the other side in the third direction are formed between the end fin groups 3A and 3B.

It is desirable that the end fin groups 3A and 3B be included in the fin group 3 arranged on the other side in the first direction.

<6. Spoiler>
As shown in FIGS. 1 and 2 , spoilers 7 are formed on fins 40 and 50 in central fin group 4 and downstream fin group 5 .

Here, FIG. 11 shows a perspective view showing a configuration example of the spoiler 7. As shown in FIG. The fins 40, 50 have guide surfaces 40S, 50S that extend in the first direction and guide the coolant W. As shown in FIG. The spoiler 7 has an opening 70 penetrating through the fins 40, 50 in the second direction. The spoiler 7 has protrusions 71 and 72 . The protruding portions 71 and 72 are formed by bending the edges of the opening 70 to one side in the same second direction, and are opposed to each other in the first direction. The opening 70 and the projections 71, 72 can be formed by cutting the fins 40, 50 and bending them. The projecting portion 71 is arranged on the other side in the first direction from the projecting portion 72 .

The projecting portions 71 and 72 have facing surfaces 71S and 72S that face one side in the direction in which the coolant W flows, that is, the first direction. The facing surfaces 71S and 72S are included in the projecting portions 71 and 72 . The spoiler 7 has a function of blocking the flow of the coolant W with the facing surfaces 71S, 72S. A turbulent flow of the coolant W is likely to occur in the vicinity of the facing surfaces 71S and 72S, and the cooling performance of the fins 40 and 50 can be improved.

The number of projections is not limited to two, and may be one or three or more. That is, the spoiler 7 has at least one projection 71, 72 projecting in the second direction from the guide surfaces 40S, 50S at the edge of the opening 70. As shown in FIG. The protrusions 71 and 72 can be easily formed as described above.

Moreover, the at least one projecting portion 71, 72 is plural. Accordingly, since a plurality of facing surfaces 71S and 72S are provided, the number of turbulent flow generating locations can be increased, and the cooling performance can be further improved.

Moreover, the protruding portions 71 and 72 incline to one side in the first direction and to the other side in the third direction. As a result, the coolant W can be guided toward the heating elements 6B and 6C by the projecting portions 71 and 72, and the cooling performance can be improved. Furthermore, two protruding portions 71 and 72 are provided and protrude in the same direction. As a result, the coolant W can be guided toward the heating elements 6B and 6C by passing the coolant W between the two projecting portions 71 and 72 facing each other. Note that the protruding portions 71 and 72 may protrude in different directions.

In the fin groups 4 and 5, for example, the spoilers 7 are provided in the fins 40 and 50 other than the fins 40 and 50 positioned on one side end in the second direction. That is, at least one of the fins 40 and 50 included in at least one of the fin groups 4 and 5 has the spoiler 7 . As shown in FIG. 2, for example, the number of spoilers 7 is 0, 4, and 6 in the fins 30, 40, and 50 at the same second direction position. For example, as shown in FIG. 12, in the fins 30, 40, and 50 at the same second direction position, the spoilers 7 are provided on the fins 30 such that the number of the spoilers 7 is two, four, or six. You can adjust the number accordingly. Furthermore, for example, as shown in FIG. 13, in the fins 30, 40, 50 at the same second direction position, the number of spoilers 7 is set to be the same on the downstream side, such as 0, 4, 4. good too.

That is, the number of spoilers 7 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 one side in the first direction. When the heat generating elements 6A, 6B, and 6C are arranged in the first direction, the temperature of the coolant W increases toward the downstream side, so it is necessary to improve the cooling performance on the downstream side. Therefore, since the number of spoilers 7 is increased toward the downstream side, the cooling performance on the downstream side, which should be improved, can be improved, and the temperature difference between the heating elements 6A, 6B, 6C can be suppressed.

Further, as shown in FIG. 14 , in at least one of the fin groups 5 , at least a part of the projecting portion 72 on the one side in the third direction is the most protruding portion 72 on the one side in the third direction when viewed in the second direction. At least the protruding portion 71 on the other side in the third direction is arranged on the one side in the third direction with respect to the fin end T2, which is the one side end in the third direction located on the other side in the third direction with respect to the one side end T1 in the third direction. A part is arranged on the other side in the third direction from the fin end T2.

Further, as shown in FIG. 14, the spoilers 7 are alternately positioned in the order of the third direction one side and the third direction other side toward the one side in the first direction.

The third direction one side spoiler 7A (high position spoiler) located furthest upstream forces the coolant W far from the base portion 2 to the third direction one side to the base portion 2 side. The spoiler 7B (low position spoiler) on the other side in the third direction guides the coolant W so as to collide with the surface on the base portion 2 side. The spoiler 7C on the one side in the third direction, which is not the most upstream side, returns the coolant W that collides with the surface on the side of the base portion 2 and rebounds to the side of the base portion 2 again.

Further, as shown in FIG. 15, in at least one of the fin groups 5, the spoilers 7 are alternately positioned along the first direction in the third direction, and are adjacent to each other in the first direction. The first direction spacing La between the spoilers 7D and 7E located on the other side in the third direction than the one side in the first direction is such that the other side in the first direction is adjacent to the one side in the first direction in the third direction. shorter than the first direction interval Lb between the spoilers 7E and 7F located on the side.

The coolant W guided to the base portion 2 side by the spoiler 7D on the other side in the first direction rebounds vigorously on the surface of the base portion 2 side. should be short. The coolant W guided toward the base portion 2 by the spoiler 7E on the one side in the first direction bounces less than the coolant W guided toward the base portion 2 by the spoiler 7D on the other side in the first direction. , 7F may be long.

Further, as shown in FIG. 16, the center position of the fin 40 in the first direction is set to 0, the upstream side is +, and the downstream side is -. When the center of gravity (average) of the position x of each spoiler 7 in the fin 40 with respect to the reference is taken, the center of gravity is downstream (-).

That is, in at least one of the fin groups 4, the center of gravity of the position of the spoiler 7 with respect to the center position of the fin 40 in the first direction is located on one side in the first direction from the center position of the first direction. As a result, it is possible to improve the cooling performance of the downstream portion where the cooling performance of the heating element 6B overlapping the fin group 4 when viewed in the third direction should be improved.

Further, as shown in FIG. 2, the spoiler 7 is not provided in the fin group 3 on the most upstream side. That is, the spoiler 7 arranged on the other side in the first direction in the plurality of fin groups 3, 4, 5 is the fin group 4 arranged on the one side in the first direction from the fin group 3 on the other side in the first direction. include. As a result, the spoiler 7 can be omitted from the most upstream fin group 3, which relatively does not require improvement in cooling performance. Thereby, the processing cost for forming the spoiler 7 can be reduced.

Furthermore, in other words, the fin group 4 composed of a plurality of fins 40 is arranged more in the first direction than the fin group 3 on the other side in the first direction, among the fin groups 3, 4, and 5 arranged in plurality in the first direction. The spoiler 7 arranged on one side and closest to the other side in the first direction is arranged closest to the other side in the first direction among the spoilers 7 arranged in the first direction in the plurality of fin groups 3 , 4 , 5 .

<7. Gap between the spoiler and the bottom plate and top plate>
Here, how to secure a gap between the spoiler 7 and the bottom plate portion and the top plate portion provided on the fins will be described. FIG. 17 is a diagram showing gaps S1 and S2 between the spoiler 7 and the bottom plate portion 401A and the top plate portion 401C provided on the fin 40, respectively. Note that the matters described below also apply to fins other than the fins 40 .

The minimum clearance of the clearances S1 and S2 must be set to the larger one of the clearances under the following conditions (1) and (2).
(1) A gap corresponding to the thickness of the gripping jig used when bending the bottom plate portion 401A and the top plate portion 401C (2) A gap for preventing the channel from being clogged by minute particles

Regarding the above (1), the gap is, for example, 0.5 to 0.7 mm. The above (2) is the clearance requested by the user. For example, if the clearance (2) desired by the user is 1.0 mm, the minimum clearance must be 1.0 mm even if the clearance (1) is 0.5 mm.

<8. Bottom concave portion>
Further, as will be described below, the heat dissipating member 1 may be provided with a bottom recessed portion with respect to the spoiler 7 . FIG. 18 is a side view showing an example in which the spoiler 7 of the fin 40 is provided with the bottom recessed portion 401A1. FIG. 19 is a perspective view showing an example of the fin 40 provided with the bottom recessed portion 401A1. The bottom recessed portion 401A1 is provided as a notch in the bottom plate portion 401A that is bent in the second direction at the end portion of the fin 40 on the other side in the third direction. Since the bottom plate portion 401A for fixing the fins 40 to the base portion 2 by brazing or the like is provided with a notch to form the bottom surface recessed portion 401A1, the bottom surface recessed portion 401A1 can be easily formed. The bottom recessed portion 401A1 is provided for each spoiler 7 . As shown in FIG. 18, the base portion 2 is arranged on the other side of the bottom plate portion 401A in the third direction. As a result, the bottom surface recessed portion 401A as a notch has a shape recessed toward the other side in the third direction. That is, the heat radiating member 1 has at least one bottom recessed portion 401A1 that is arranged on the other side in the third direction relative to at least one of the spoilers 7 and that is recessed toward the other side in the third direction.

FIG. 20 shows an example of the bottom recessed portion 401A1 and the spoiler 7 when viewed from the one side in the third direction toward the other side in the third direction. In the example of FIG. 20, the second direction positions of all the spoilers 7 and the second direction positions of all the bottom surface recesses 401A1 match. That is, at least a portion of the second direction position of at least one of the spoilers 7 and at least a portion of the second direction position of the at least one bottom surface recessed portion 401A1 match.

The boundary layer of the flow of the coolant W generated on one side surface of the bottom plate portion 401A in the third direction is broken by the discontinuous surface of the bottom recessed portion 401A1, and the flow of the coolant W is suspended from the end surface of the bottom recessed portion 401A1 on the other side in the third direction. becomes. Furthermore, the turbulent flow generated by the spoiler 7 joins the flow in the floating state, thereby accelerating the destruction of the boundary layer. Therefore, the cooling performance of cooling the heating element with the coolant W can be improved.

Each spoiler 7 in the fin 40 constitutes a set with each bottom recessed portion 401A1. Similarly, each of the spoilers 7 in the fins 50 are paired with individual bottom recesses. Therefore, as shown in FIG. 2, the number of spoilers 7 included in each of the fins 40, 50 at the same second direction position increases toward one side in the first direction. , the number of such sets for fin 50 is greater than the number of such sets for fin 40 . That is, the number of pairs of the spoiler 7 and the bottom recessed portion 401A1 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 one side in the first direction. become more. Since the number of sets of the spoiler 7 and the bottom recessed portion 401A1 increases toward the downstream side, it is possible to improve the cooling performance on the downstream side where the cooling performance should be improved.

Further, as shown in FIG. 20, a portion of the bottom recessed portion 401A1 overlaps a portion of the spoiler 7 when viewed in the third direction. That is, at least a portion of at least one bottom recessed portion 401A1 overlaps with at least a portion of the spoiler 7 when viewed in the third direction. This makes it easier for the turbulent flow generated by the spoiler 7 to merge with the flow in the floating state, and easily destroy the boundary layer.

Further, the bottom recessed portion 401A1 paired with a part of the spoiler 7 provided in the center fin group 4 overlaps the heating element 6B (FIG. 3) when viewed in the third direction. Similarly, the bottom recessed portion 401A1 paired with a part of the spoiler 7 provided in the downstream fin group 5 overlaps the heating element 6C (FIG. 3) when viewed in the third direction. That is, at least a portion of at least one bottom recessed portion 401A1 overlaps with the heating elements 6B and 6C that can be arranged on the other side of the heat radiating member 1 in the third direction when viewed in the third direction. As a result, the cooling performance for cooling the heating elements 6B and 6C can be improved.

A facing surface 71S (FIG. 18) of the projecting portion 71 of the spoiler 7 inclines toward one side in the first direction and the other side in the third direction. That is, the facing surface 71S of at least one of the spoilers 7 is inclined toward one side in the first direction and the other side in the third direction. This makes it easier to guide the turbulent flow generated on the facing surface 71S of the spoiler 7 toward the bottom surface recessed portion 401A1, thereby further promoting the breakage of the boundary layer.

The positional relationship between the facing surface 71S and the bottom recessed portion 401A1 can take various forms, for example. In the first form shown in FIG. 21, the first direction one side end 71Sa of the facing surface 71S is arranged on the first direction other side of the first direction one side end ta of the bottom surface recessed portion 401A1. In addition, the first direction other side end 71Sb of the facing surface 71S is arranged at the same first direction position as the first direction other side end portion tb of the bottom surface recessed portion 401A1.

In the second embodiment shown in FIG. 22, the first direction one side end 71Sa of the facing surface 71S is located on the first direction other side of the first direction one side end ta of the bottom surface recessed portion 401A1 and the first direction side of the bottom surface recessed portion 401A1. It is arranged on the first direction one side of the direction other side end portion tb. In addition, the first direction other side end 71Sb of the facing surface 71S is arranged on the first direction other side than the first direction other side end portion tb of the bottom surface recessed portion 401A1.

In the third embodiment shown in FIG. 23, the first direction one side end 71Sa of the facing surface 71S is arranged at the same first direction position as the first direction other side end tb of the bottom recessed portion 401A1. In addition, the first direction other side end 71Sb of the facing surface 71S is arranged on the first direction other side than the first direction other side end portion tb of the bottom surface recessed portion 401A1.

In the fourth embodiment shown in FIG. 24, the first direction one side end 71Sa and the first direction other side end 71Sb of the facing surface 71S are on the first direction other side of the first direction other side end tb of the bottom surface recessed portion 401A1. placed in

In the fifth embodiment shown in FIG. 25, the first direction one side end 71Sa and the first direction other side end 71Sb of the facing surface 71S are located on the first direction one side of the first direction other side end tb of the bottom surface recessed portion 401A1. , and is arranged on the other side in the first direction from the first direction one side end ta of the bottom surface recessed portion 401A1.

Therefore, in the first to fifth forms described above, the first direction one side end 71Sa of the facing surface 71S is arranged on the first direction other side of the first direction one side end ta of the bottom recessed portion 401A1. As a result, the downstream end of the turbulent flow generated by the facing surface 71S can be arranged upstream of the first direction one side end ta of the bottom surface recessed portion 401A1, making it easier to break the boundary layer.

In addition, in the above-described first to third and fifth forms, the first direction one side end 71Sa of the facing surface 71S is at the same first direction position as the first direction other side end tb of the bottom recessed portion 401A1, or It is arranged on the first direction one side of the first direction other side end portion tb of the bottom surface recessed portion 401A1. As a result, the downstream end of the turbulent flow generated by the facing surface 71S can be easily arranged between both ends of the bottom surface recessed portion 23 in the first direction, and the boundary layer can be easily destroyed.

In addition, in the above-described first and fifth embodiments, the first direction other side end 71Sb of the opposing surface 71S is located at the same first direction position as the first direction other side end tb of the bottom recessed portion 401A1, or It is arranged on the first direction one side of the first direction other side end portion tb. The turbulent flow generated by the facing surface 71S is easily merged with the floating flow, and the boundary layer is easily destroyed.

In addition, in the above-described second to fourth embodiments, the first direction other side end 71Sb of the facing surface 71S is arranged on the first direction other side than the first direction other side end tb of the bottom surface recessed portion 401A1. This can promote destruction of the boundary layer by the turbulent flow generated by the facing surface 71S.

Also, as shown in FIG. 26, the spoiler 7 may be inclined substantially perpendicularly to the flow direction. In this case, the cooling effect increases while the pressure loss increases under the condition of constant flow rate. The inclination angle may be determined after determining the permissible level of pressure loss in consideration of the performance of the liquid pump to be used and the flow path resistance of the entire flow path.

Further, as shown in FIG. 27, when the third direction other side end 7bt of the spoiler 7 faces the bottom surface recessed portion 401A1 in the third direction, by providing the bottom surface recessed portion 401A1 in the bottom plate portion 401A, the same third direction flow path The spoiler 7 can be brought closer to the bottom plate portion 401A side to secure the width. Thereby, the cooling performance can be further improved. Further, as shown in FIG. 27, a notch 401C1 facing the third direction one side end 7ut of the spoiler 7 in the third direction can be provided in the top plate portion 401C. As a result, the spoiler 7 can be brought closer to the top plate portion 401C side while ensuring the same third direction flow path width. By narrowing the gap between the top plate portion 401C and the spoiler 7, the amount of the coolant W flowing between the top plate portion 401C and the spoiler 7 is reduced, and the coolant W flowing near the top plate portion 401C is directed to the bottom plate portion 401A side. easier to introduce into

Moreover, FIG. 28 is a side view showing an example in which a bottom recessed portion is provided in the base portion 2. As shown in FIG. The bottom recessed portion 23 shown in FIG. 28 is recessed from one side surface 21 in the third direction of the base portion 2 toward the other side in the third direction. As a result, when the fin 40 is not provided with a bottom plate portion, it is possible to provide the bottom recessed portion, thereby making it possible to improve the cooling performance.

<9. Others>
The embodiments of the present disclosure have been described above. Note that the scope of the present disclosure is not limited to the above-described embodiments. The present disclosure can be implemented by adding various changes to the above-described embodiments without departing from the gist of the invention. In addition, the matters described in the above-described embodiments can be appropriately and arbitrarily combined as long as there is no contradiction.

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

INDUSTRIAL APPLICABILITY The present disclosure can be used to cool various heating elements.

REFERENCE SIGNS LIST 1 heat dissipation member 2 base portion 3 upstream fin group 3A, 3B end fin group 4 center fin group 5 downstream fin group 6A heat generating element 6A, 6B, 6C heat generating element 7 spoiler 10 heat radiating fin portion 21 third direction one side surface 22 Third Direction Other Side 23 Bottom Concave 30, 40, 50 Fin 40S, 50S Guide Surface 70 Opening 71, 72 Protruding 71S, 72S Opposing Surface 100 Concave 301 First Fin 301A Bottom Plate 301B Wall 301C Top Plate 302 2nd fin 302A Bottom plate portion 302B Wall portion 303 Third fin 303A Bottom plate portion 303B Wall portion 303C Top plate portion 401 First fin 401A Bottom plate portion 401A1 Bottom recess 401C Top plate portion 401C1 Notch 402 Second fin 403 Third fin 501 First Fin 502 Second fin 503 Third fin BT Bottom plate CF Connecting fin FP Fin plate S Slot W Coolant

Claims (24)

a plate-shaped base portion that spreads in a first direction along the direction in which the coolant flows and a second direction that is orthogonal to the first direction, and that has a thickness in a third direction that is orthogonal to the first direction and the second direction;
a plurality of fin groups arranged side by side in the first direction, each fin projecting from the base portion toward one side in the third direction and extending in the first direction;
has
at least one of the fins included in at least one of the fin groups has a spoiler having a facing surface facing one side in the first direction, which is the downstream side in the direction in which the coolant flows;
The heat dissipating member, wherein the number of the spoilers included in each of the fins at the same position in the second direction in the plurality of fin groups increases toward the one side in the first direction. the fins have guide surfaces extending in a first direction to guide the coolant;
The spoiler has an opening penetrating the fins in a second direction and at least one protrusion projecting in the second direction from the guide surface at the edge of the opening,
The heat dissipating member according to claim 1, wherein the facing surface is included in the projecting portion. The heat dissipating member according to claim 2, wherein the at least one protrusion is plural. The heat dissipating member according to claim 2 or 3, wherein the protruding portion inclines toward one side in the first direction and the other side in the third direction. 5. The heat dissipating member according to claim 4, wherein two of said protrusions are provided and protrude in the same direction. in at least one fin group,
At least part of the projecting portion on the one side in the third direction is a third projection located on the other side in the third direction from the end on the one side in the third direction that is closest to the one side in the third direction in the fin. arranged on the one side in the third direction from the fin end, which is the one side end of the direction;
6. The heat dissipating member according to claim 5, wherein at least a part of said projecting portion on the other side in the third direction is arranged on the other side in the third direction with respect to said fin end. 7. The heat dissipating member according to claim 6, wherein the spoilers are alternately positioned on the one side in the third direction and on the other side in the third direction in order toward the one side in the first direction. in at least one fin group, the spoilers are alternately positioned in a third direction along the first direction;
The first direction spacing between the spoilers adjacent in the first direction and having the other side in the first direction located on the other side in the third direction relative to the one side in the first direction is a distance between the spoilers adjacent to the first direction and the second side in the first direction. The heat dissipating member according to any one of claims 4 to 7, wherein the other side in one direction is shorter than the one side in the first direction than the one side in the first direction than the first direction interval between the spoilers located on the one side in the third direction. 2. In at least one of the fin groups, the center of gravity of the position of the spoiler with respect to the center position of the fin in the first direction is positioned on one side in the first direction from the center position in the first direction. The heat dissipating member according to claim 8 . The spoiler arranged on the other side in the first direction in the group of fins is included in the group of fins arranged on the one side in the first direction from the group of fins on the other side in the first direction. The heat radiating member according to any one of claims 1 to 9. A second Having end fin groups arranged at both ends of the direction,
The heat dissipating member according to any one of claims 1 to 10, wherein a recess recessed toward the other side in the third direction is formed between the end fin groups. 12. The heat dissipating member according to claim 11, wherein said end fin group is included in said fin group arranged closest to the other side in the first direction. having at least one bottom recessed portion disposed on the other side in the third direction from at least one of the spoilers and recessed toward the other side in the third direction;
13. The second directional position of at least a portion of the at least one spoiler and the second directional position of at least a portion of the at least one bottom surface recess according to any one of claims 1 to 12. The heat dissipating member described. 14. The heat dissipating member according to claim 13, wherein the bottom recessed portion is provided as a notch in a bottom plate portion bent in the second direction at the other end of the fin in the third direction. 14. The heat dissipating member according to claim 13, wherein the bottom recessed portion is recessed from one side surface of the base portion in the third direction toward the other side in the third direction. The heat dissipating member according to any one of claims 13 to 15, wherein the facing surface of at least one of the spoilers is inclined to one side in the first direction and to the other side in the third direction. 17. The heat dissipating member according to claim 16, wherein the first direction one side end of the opposing surface is arranged on the first direction other side of the first direction one side end of the bottom surface recess. The first direction one side end of the opposing surface is at the same first direction position as the first direction other side end of the bottom recessed portion, or on the first direction one side of the first direction other side end of the bottom recessed portion. The heat dissipating member of claim 17, wherein the heat dissipating member is arranged in a The other end in the first direction of the opposing surface is located at the same first direction position as the other end in the first direction of the bottom recessed portion, or on the one side in the first direction relative to the other end in the first direction of the bottom recessed portion. 19. The heat dissipating member according to any one of claims 16 to 18, arranged in the . 19. The end of the opposing surface on the other side in the first direction according to any one of claims 16 to 18, wherein the other side in the first direction is arranged on the other side in the first direction with respect to the other end in the first direction of the bottom surface recess. Heat dissipation material. Claims 13 to 20, wherein the number of pairs of the spoiler and the bottom surface recess included in each of the fins at the same position in the second direction in the plurality of fin groups increases toward one side in the first direction. The heat radiating member according to any one of 1. 22. The method according to any one of claims 13 to 21, wherein at least a portion of the at least one bottom recessed portion overlaps with the heat generating element that can be arranged on the other side of the heat radiating member in the third direction when viewed in the third direction. The heat dissipating member described. The heat dissipating member according to any one of claims 13 to 22, wherein at least a portion of the at least one bottom recessed portion overlaps at least a portion of the spoiler when viewed in a third direction. A top plate bent in the second direction is provided at one end in the third direction of at least one of the fins,
The heat dissipating member according to any one of claims 1 to 23, wherein the top plate portion is provided with a top plate notch facing at least one of the spoilers in the third direction.

Images