Heat dissipation member and power supply device

Abstract

The invention provides a heat dissipation member and a power supply device. The heat dissipation component can reduce restriction on configuration design of a motor component and maintain good cooling performance. The heat dissipation component is used for cooling a motor component, and is characterized in that the heat dissipation component is provided with a refrigerant flow path formed between an inlet and an outlet, and needle-shaped fins and vertical fins which are arranged in the refrigerant flow path, the needle-shaped fins are preferentially arranged at positions where components with large heat generation amount are arranged, and the vertical fins are arranged at positions where the components with large heat generation amount are arranged. The longitudinal fins are preferentially disposed at locations where flow paths are oriented, and at least a portion of the longitudinal fins is a curved longitudinal fin facing a portion of the needle-shaped fins.

Description

Technical Field

[0001] The present invention relates to a heat dissipation component for cooling a motor component accompanied by heat generation. Specifically, the present invention relates to a heat dissipation component capable of effectively dissipating heat corresponding to each element of a substrate constituting a motor component and the arrangement of peripheral components, and a power supply device having the heat dissipation component. Background Art

[0002] Conventionally, as cooling fins for dissipating heat from a motor component accompanied by heat generation by air cooling or water cooling, there are known needle-shaped needle fins as shown in Patent Document 1 and longitudinal fins having a longitudinal shape extending along a refrigerant flow path as shown in Patent Document 2. The needle fins can obtain a large surface area in contact with the refrigerant, and thus have high cooling performance, but it is difficult to control the direction of refrigerant flow. Although the longitudinal fins are easy to control the direction of refrigerant flow, there is a problem in terms of cooling performance. Based on such differences in characteristics, currently, needle fins or longitudinal fins are selected according to the priority items required in the required specifications of the motor component.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2012-248576

[0004] Patent Document 2: Japanese Patent No. 4445566

[0005] However, for the fins selected in this way, whether they are needle fins or longitudinal fins, as described above, as long as the cooling performance and the flow path controllability are in an antinomic relationship, the performance of the heat dissipation component will be restricted to a certain extent. In the presence of such restrictions, there is a problem that the design difficulty of component arrangement becomes significantly higher. Summary of the Invention

[0006] An object of the present invention is to solve such problems, and an object of the present invention is to provide a heat dissipation component and a power supply device that can reduce the restrictions in the arrangement design of motor components and maintain good cooling performance.

[0007] In order to achieve such an object, the technical solution of the present invention is a heat dissipation component having at least the following structure.

[0008] A heat dissipation component for cooling a motor component, characterized in that the heat dissipation component has a refrigerant flow path formed between an inlet and an outlet, and needle fins and longitudinal fins disposed in the refrigerant flow path. The needle fins are preferentially disposed in a portion where components with a large amount of heat generation are arranged, the longitudinal fins are preferentially disposed in a portion where the orientation of the flow path is performed, and at least a part of the longitudinal fins is a bent longitudinal fin facing a part of the needle fins.

[0009] In addition, in order to achieve the above object, the technical solution of the present invention is a power supply device having at least the following structure.

[0010] A vehicle-mounted power supply device, characterized in that the power supply device has a heat dissipation component for cooling motor components, the heat dissipation component has a refrigerant flow path formed between an inlet and an outlet, and needle fins and longitudinal fins disposed in the refrigerant flow path, the needle fins are preferentially disposed in a portion where components with a large amount of heat generation are arranged, the longitudinal fins are preferentially disposed in a portion for directing the flow path, and at least a part of the longitudinal fins is a buckled longitudinal fin facing a part of the needle fins.

[0011] By having such characteristics, the present invention has the following effects.

[0012] The present invention can provide a heat dissipation component and a power supply device, which can reduce the restrictions in the layout design of motor components and maintain good cooling performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a perspective view of the power supply device according to the first embodiment of the present invention.

[0014] Figure 2 is a view of Figure 1 part A enlarged, and is a perspective view of a part of the power supply device according to the first embodiment of the present invention enlarged.

[0015] Figure 3 is a top view of the power supply device according to the first embodiment of the present invention.

[0016] Figure 4 is a perspective view of a part of the power supply device according to the second embodiment of the present invention enlarged.

[0017] Figure 5 is a top view of the power supply device according to the third embodiment of the present invention.

[0018] Figure 6 is a top view of the power supply device according to the fourth embodiment of the present invention.

[0019] Figure 7 is a top view of a power supply device as a comparative example.

[0020] Figure 8 is a view showing simulation results for verifying the difference in flow velocity in regions where needle fins of the comparative example and the first embodiment are arranged.

[0021] REFERENCE NUMERAL DESCRIPTION

[0022] 1: Heat dissipation component; 10: Base portion; 11: Pin fins; 11': Pin fins; 12: Longitudinal fins; 121: Buckled longitudinal fins; 122: Arc-shaped longitudinal fins; 2: Motor component housing; 100: Power supply device. Detailed implementation mode

[0023] Hereinafter, examples of the implementation modes of the power supply device of the present invention will be described based on the drawings. However, the following drawings are made for illustrative purposes, and for ease of understanding, sometimes components that are not required in the description are intentionally not shown. In addition, for the purpose of description, sometimes components are intentionally shown larger or smaller, and the drawings do not represent an accurate scale. In the following description, the same reference numerals in different drawings denote parts having the same function, and repeated descriptions in each drawing are appropriately omitted.

[0024] <First Embodiment>

[0025] Figure 1 It is a perspective view of the power supply device according to the first embodiment of the present invention. Figure 2 It is to Figure 1 The enlarged view of part A, and it is an enlarged perspective view of a part of the power supply device according to the first embodiment of the present invention. Figure 3 It is a top view of the power supply device according to the first embodiment of the present invention.

[0026] Figure 1 It shows a power supply device 100 such as a DC / DC converter mounted on an electric vehicle or the like. The power supply device 100 is provided with a heat dissipation component 1 on the motor component housing 2. Heat generating elements (not shown) such as power transistors and capacitors are housed in the motor component housing 2. The heat dissipation component 1 is a so-called radiator that efficiently combines heat conduction, convection, and radiation to release the heat generated by the heat generating elements, and its cooling performance is designed so that electronic components such as power transistors and capacitors as heat generating elements do not exceed the heat-resistant temperature.

[0027] The heat dissipation component 1 forms the upper side part of the power supply device 100, and a plurality of fins (11, 12, 121, 122) are provided on the base portion 10. In addition, in Figure 1 , the base portion 10 represents the part of the heat dissipation component 1 and is described as "1(10)".

[0028] In addition, by covering the heat dissipation component 1 shown in Figure 1 with a flow path cover (not shown), an inlet Cin and an outlet Cout for the refrigerant are formed. Although in Figure 1Although not shown, a protruding portion is provided on the flow path cover and faces the base portion 10 of the heat dissipation member 1, and a dotted line is depicted at the position where the base portion 10 abuts against the protruding portion. In this way, the heat dissipation member 1 is covered by the flow path cover, thereby forming an inlet Cin and an outlet Cout.

[0029] The base portion 10 is made of a material with high thermal conductivity, such as aluminum or a casting.

[0030] The plurality of fins are roughly divided into needle-shaped fins 11 and longitudinal fins 12. The longitudinal fins 12 include bent-shaped longitudinal fins 121 and arc-shaped longitudinal fins 122. And, as the arc-shaped longitudinal fins 122, there are various types with different radii.

[0031] The refrigerant flowing in from the inlet Cin flows through the gaps between the plurality of fins (11, 12, 121, 122) and is discharged from the outlet Cout. The refrigerant is, for example, water or an ethylene glycol aqueous solution, but gases such as hydrofluoroolefins and hydrofluorocarbons can also be used.

[0032] However, in recent automobiles, there is a tendency to arrange a plurality of electrical components and other components in a narrow space, and it is difficult to have room for the piping of the cooling water. For example, when supplying cooling water from the vehicle, it is often the case that the piping connected to the inlet and the piping connected to the outlet must be arranged close to each other. In the first embodiment, as Figure 3 shown, it is also configured such that the refrigerant flowing in from the inlet Cin changes direction upward in the plane of the paper, then turns right, folds back to the left in the right side of the power supply device 100, and finally is discharged from the outlet Cout adjacent to the inlet Cin. The unillustrated inlet piping and the unillustrated outlet piping are arranged close to each other.

[0033] Assuming that there is no restriction on the arrangement space and the piping can be freely handled, in Figure 3 for example, if the refrigerant can flow in from the left side and be discharged from the right side, a plurality of linear longitudinal fins extending across the left and right can be arranged in parallel to cope with it. In such a fin shape, the flow velocity hardly differs between the left and right fin parts. As the refrigerant flows, the water temperature becomes higher. Therefore, for components with a larger heat generation amount, a simple layout design of arranging them upstream in the water path is sufficient.

[0034] However, as described above, the piping is restricted in its arrangement due to practical problems, and the layout of each component is also restricted by electrical connections, and it is not always possible to arrange the heat generating components upstream in the water path. Therefore, in the first embodiment, considering the characteristics of the needle-shaped fins 11 and the longitudinal fins 12, the preferred arrangement and shape of the two are considered.

[0035] AsFigure 3 As shown, the flow path from the inlet Cin is first directed upward on the paper surface through the longitudinal fins 12 extending vertically on the paper surface. Then, via the bending portion, the direction of the flow path is changed, and it is directed to the right through the longitudinal fins 12 extending horizontally on the paper surface. However, not all of the longitudinal fins 12 extend straight to the left and right. A part of the longitudinal fins 12 is a bent-shaped longitudinal fin 121 having a shape bent toward the region where a plurality of needle fins 11 are erected, thereby forming a flow path guiding portion toward the needle fins 11 (also refer to Figure 2 the enlarged perspective view).

[0036] As described above, the needle fins can obtain a large surface area in contact with the refrigerant, so the cooling performance is high. As Figure 3 shown, the needle fins 11 are arranged in the center. Configuring switching elements such as power transistors, capacitors, and coils closer to the center can further improve the design freedom of the circuit configuration. Therefore, the needle fins 11 should be arranged in the center. However, it does not mean that just by arranging the needle fins 11 in the center, the overall cooling performance can be improved only by this configuration. This is because the flow rate of the refrigerant also has a great relationship. It is important not to reduce the flow rate of the refrigerant guided to the region where the needle fins 11 are erected. Therefore, in the heat dissipation component 1 of the power supply device 100 according to the first embodiment of the present invention, a bent-shaped longitudinal fin 121 is provided. As Figure 2 shown, only one bent-shaped longitudinal fin 121 is provided, but it has been confirmed that just the difference in the presence or absence of this bent-shaped longitudinal fin 121 will bring a large difference in the cooling performance. Regarding this point, the simulation results will be shown and described later.

[0037] In addition, it is also important to minimize the reduction in the flow rate at the position where the flow path to the right turns back to the left. Therefore, in the heat dissipation component 1 of the power supply device 100 according to the first embodiment of the present invention, arc-shaped longitudinal fins 122 are provided in which a plurality of arcs with different radii are arranged in layers. Since the flow path is formed by a plurality of arcs, the reduction in the flow rate of the refrigerant can be suppressed as much as possible.

[0038] In this way, in the heat dissipation component 1 of the power supply device 100 according to the first embodiment of the present invention, the needle fins 11 are preferentially arranged at the positions where components with large heat generation are arranged, and the longitudinal fins 12 are preferentially arranged at the positions where the flow path is directed. Here, the description of "preferentially" means that there may be exceptions. For example, in Figure 3 , the flow path from the right to the left finally changes its orientation downward on the paper surface, but no longitudinal fin 12 is provided here. In addition, in Figure 3In some cases, it is impossible to completely avoid arranging heat-generating components in the area where the arc-shaped longitudinal fins 122 are configured. However, even in the area where heat-generating components are arranged, it is possible to choose not to arrange the needle fins 11 here. In short, "priority" means that generally speaking, there is such a tendency from a macroscopic perspective, which does not mean that needle fins necessarily exist at the location where components with a large amount of heat generation are arranged, and longitudinal fins necessarily exist at the position where the flow path is switched.

[0039] In addition, in the heat dissipation component 1 of the power supply device 100 according to the first embodiment of the present invention, the inlet Cin and the outlet Cout of the refrigerant flow path are arranged approximately in a row, and the path is in a circular shape. Thus, in the heat dissipation component 1 that demarcates the inner and outer sides, it can be understood that most of the needle fins 11 are arranged on the inner side, and most of the longitudinal fins 12 are arranged on the outer side. When the flow path is bent, the cooling water tends to the outer side of the bend. In terms of the flow velocity, the flow velocity on the inner side of the bend is lower than that on the outer side of the bend. It is difficult to cool the inner side of the bend. If a heat-generating body is arranged on the inner side of the bend, it may not be cooled. Therefore, the needle fins 11, which are advantageous in terms of cooling performance, are arranged on the inner side. In other words, since the flow velocity on the outer side is relatively high, it can be dealt with by the longitudinal fins 12.

[0040] <Second Embodiment>

[0041] Figure 4 It is a perspective view showing an enlarged part of the power supply device according to the second embodiment of the present invention. In the heat dissipation component 1 of the power supply device 100A according to the second embodiment, regarding the fact that the flow path from the inlet Cin (not shown) to the outlet Cout (not shown) is in a circular shape, not all of the longitudinal fins 12 extend straight to the left and right. Instead, a part of the longitudinal fins 12 are in a bent shape of the bent longitudinal fins 121 that are bent in the area where they stand upright with respect to a plurality of needle fins 11'. The formation of the flow path guiding portion to the needle fins 11' is the same as that of the power supply device 100 in the first embodiment.

[0042] In addition, the height of the longitudinal fin 12 in the second embodiment is the same as that of the longitudinal fin 12 in the first embodiment. However, the height of the pin-shaped fin 11' in the second embodiment is greater than that of the pin-shaped fin 11 in the first embodiment. In other words, in the second embodiment, it can be said that the height of the pin-shaped fin 11' is greater than that of the longitudinal fin 12. This is a concept of making the most of the special feature of the pin-shaped fin, which is that a large surface area in contact with the refrigerant can be obtained. In addition, the power supply device 100A of the second embodiment also has a flow path cover not shown in the figure, but the heat dissipation component of the second embodiment can also be understood as a technical concept that the distance between the longitudinal fin 12 and the flow path cover is greater than the distance between the pin-shaped fin 11' and the flow path cover. However, instead of using liquid or special gas as the refrigerant, when the vehicle is a two-wheeled vehicle and the natural wind during driving is used as the refrigerant, it is also conceivable that the flow path cover is not provided, so the determination based on the height of the fin and the determination based on the distance between the cover and the fin are not completely the same. In the second embodiment, instead of all the pin-shaped fins 11', a part of the pin-shaped fins 11 may be provided. That is, the pin-shaped fins 11' which are higher than the longitudinal fins 12 and the pin-shaped fins 11 which are the same height as the longitudinal fins 12 may be mixed. The cooling performance required according to the arrangement of the heat generating elements and the heat generation of each heat generating element may be appropriately set.

[0043] <Third embodiment>

[0044] Figure 5 It is a top view of the power supply device of the third embodiment of the present invention. In the heat dissipation component 1 of the power supply device 100B of the third embodiment, the proportion of the area where the pin-shaped fins 11 are arranged is overwhelmingly increased compared with the first embodiment and the second embodiment. Depending on the circuit structure, the heat generating element is sometimes not accommodated only in the central part, but also has to be arranged on the outside. In such a case, the technical idea is to arrange the pin-shaped fins 11 in the area where the heat generating element is arranged outside the center. In addition, there are no longitudinal fins for folding back from the right to the left on the paper, but the wall is arranged on the outermost side of the entire flow path by covering it with the flow path shell, thereby realizing the folding back of the movement of the refrigerant. Although it is undeniable that the flow velocity is reduced, such a design can also be provided when the heat generation of the heat generating element, the flow velocity, and the cooling performance of the pin-shaped fins are comprehensively considered.

[0045] <Fourth embodiment>

[0046] Figure 6It is a top view of the power supply device according to the fourth embodiment of the present invention. Regarding the power supply device 100C of the fourth embodiment, a situation where there is some surplus in the installation space is assumed. It is the following situation: Even if the refrigerant does not flow in from the left and flow out from the right, it is possible to realize the piping for the refrigerant to flow in from below the paper surface and flow out from the right side of the paper surface. If it is a flow path that goes around in a circle, the deviation of the refrigerant inside and outside and the decrease in flow velocity become larger. If it is the method like the fourth embodiment, it can be slightly suppressed. It can be understood that even if the refrigerant flow path is not circular and the path from the inlet to the outlet is not linear, as Figure 6 shown, the inside and outside are also defined. Of course, the area where the pin fins 11 are arranged is the inside, and the area where the longitudinal fins 12 are arranged is the outside. Regarding the fourth embodiment, by arranging the pin fins 11, which are advantageous in terms of cooling performance, on the inside where the flow velocity decreases and on the inside where it is easy to arrange the heating element in the circuit design, there is an advantageous effect that it can be designed not to exceed the heat-resistant temperature required for the electronic components, which is the same as in the first embodiment and the like.

[0047] <Verification of Cooling Performance>

[0048] An explanation will be given of the evaluation of the cooling performance carried out using the first embodiment of the present invention. Figure 7 It is a top view of the power supply device as a comparative example prepared for the first embodiment. Comparing Figure 3 and Figure 7 it can be immediately understood that the first embodiment of the present invention has, as one of its features, the longitudinal fin 121 with a buckled shape facing a part of the pin fins. In contrast, the comparative example does not have this feature.

[0049] The simulation results for verifying the difference in flow velocity in the areas where the pin fins of the comparative example and the first embodiment are arranged are shown in Figure 8 . Since the original color image is set to grayscale, it is difficult to understand, but in the area where the pin fins that should be focused on are arranged, the flow velocity of the comparative example is 0.05 m / s to 0.1 m / s. In contrast, the flow velocity of the first embodiment is 0.15 m / s to 0.2 m / s. This value is not inferior to the flow velocity near the longitudinal fins arranged outside the inlet Cin. Also, of course, the flow velocity is large at the narrow inlet Cin of the flow path. Moreover, under the condition of this flow velocity, the pin fins of the first embodiment can sufficiently reduce its thermal resistance compared with the pin fins of the comparative example.

[0050] As described above, the heat dissipation component and the power supply device of the embodiment of the present invention have been described in detail. However, the specific structure is not limited to these embodiments, and design changes and the like within the scope not departing from the gist of the present invention are also included in the present invention. For example, in each embodiment, an electrical or electronic circuit is described as the object to be cooled, but a motor component including a heat-generating mechanical component such as a motor-integrated inverter may also be used as the object. In addition, the place where the heat dissipation component and the power supply device are arranged is not limited to the engine room, and the drive shaft of the drive wheel of the motor of the electric motorcycle is also included in the present invention.

[0051] As described in this specification, regarding the selection of the pin fins and the longitudinal fins, the cooling performance and the flow path controllability are in an antinomy relationship. Therefore, the performance of the heat dissipation component is restricted to a certain extent, and the difficulty of the component arrangement design becomes extremely high. Considering such problems, it should be correctly recognized that the present invention, which not only has the pin fins and the longitudinal fins mixedly present but also has found meaningful determinations regarding the arrangement and shape of both, can adopt various methods according to the differences in the restriction conditions of various motor components and auxiliary equipment such as the cooling water piping.

Claims

1. A heat dissipation component for cooling a motor component, characterized in that the heat dissipation component has a refrigerant flow path formed between an inlet and an outlet, and needle fins and longitudinal fins disposed in the refrigerant flow path, the needle fins are preferentially disposed at a location where a component with a large amount of heat generation is disposed, the longitudinal fins are preferentially disposed at a location for directing the flow path, and at least a part of the longitudinal fins is a buckled longitudinal fin facing a part of the needle fins.

2. The heat dissipation component according to claim 1, characterized in that in the refrigerant flow path, the path from the inlet to the outlet is not linear, but defines an inner side and an outer side, most of the needle fins are disposed on the inner side, most of the longitudinal fins are disposed on the outer side.

3. The heat dissipation component according to claim 2, characterized in that in the refrigerant flow path, the inlet and the outlet are arranged substantially in alignment, and the path is in a circular shape, thereby defining an inner side and an outer side.

4. The heat dissipation component according to claim 1, characterized in that the needle fins include at least a part of the needle fins having a height greater than the height of the longitudinal fins.

5. The heat dissipation component according to claim 1, characterized in that the heat dissipation component has a flow path cover opposed in the direction in which the needle fins and the longitudinal fins project, the distance between the longitudinal fins and the flow path cover is greater than the distance between the needle fins and the flow path cover.

6. The heat dissipation component according to claim 1, characterized in that the buckled longitudinal fins are only disposed at the flow path guiding portion to the needle fins.

7. The heat dissipation component according to claim 1, characterized in that a part of the longitudinal fins is a plurality of arc-shaped longitudinal fins with different radii, and the arcs are arranged in a layered manner.

8. A vehicle-mounted power supply device, characterized in that the power supply device has the heat dissipation component according to any one of claims 1 to 7.

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