Radiating device of power device and double-layer radiator

Abstract

The invention provides a heat dissipation device of a power device and a double-layer heat dissipation device. The heat dissipation device comprises a heat dissipation plate, and one side of the heat dissipation plate is provided with a power device; the plurality of corrugated fins are uniformly distributed on the other side of the heat dissipation plate and are used for forming a heat dissipation channel of cooling liquid so as to carry out heat dissipation on the power device; the transverse distance between every two rows of corrugated fins is the same, and the longitudinal distance between every two columns of corrugated fins is the same. Wherein the shape parameters of the corrugated fins change along with the flowing direction of the cooling liquid, and the shape parameters comprise at least one of the following items: the length of the fins, the thickness of the fins, the bending direction of the fins or the bending rate of the fins.

Description

Technical Field

[0001] The present disclosure relates to the field of heat dissipation, and in particular to a heat dissipation device for a power device and a double-layer heat sink. Background Art

[0002] The power module in the motor controller generates a lot of heat loss during operation. Commonly used heat dissipation structures include straight fins, Pin-Fin needle fins, etc. These heat dissipation structures have poor flow disturbance ability and heat dissipation effect. Summary of the invention

[0003] The present disclosure proposes a heat dissipation device for a power device, which can solve the technical problems of unstable heat dissipation effect and low heat dissipation efficiency of the power device to a certain extent.

[0004] According to a first aspect, the present disclosure provides a heat dissipation device for a power device, comprising:

[0005] A heat sink, with a power device disposed on one side of the heat sink;

[0006] A plurality of corrugated fins are evenly distributed on the other side of the heat sink, and are used to form a heat dissipation channel for the coolant to dissipate heat from the power device; the horizontal spacing between the corrugated fins in each row is the same, and the vertical spacing between the corrugated fins in each column is the same;

[0007] The shape parameters of the corrugated fins vary with the flow direction of the coolant, and the shape parameters include at least one of the following: fin length, fin thickness, fin bending direction or fin curvature.

[0008] According to a second aspect, the present disclosure further provides a double-layer heat sink, comprising two heat dissipation devices according to the first aspect arranged opposite to each other; wherein the corrugated fins of the two heat dissipation devices are separated by an isolation member to form two heat dissipation passages respectively.

[0009] It can be seen from the above that the heat dissipation device and double-layer heat sink provided by the present disclosure improve the flow rate and flow of the coolant by optimizing the shape and arrangement layout of the corrugated fins provided on the heat dissipation plate, thereby further improving the heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0011] Figure 1A schematic diagram of a heat dissipation device for a power device according to an embodiment of the present disclosure.

[0012] Figure 2-Figure 3 Schematic diagram of a corrugated fin according to an embodiment of the present disclosure.

[0013] Figure 4 Schematic diagram of a double-layer heat sink according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0014] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0015] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0016] The power module in the motor controller generates a large amount of heat loss during operation, causing the temperature to rise rapidly and reducing the service life of the power module. The spatial structure of the power module is compact, so it needs to have a strong heat dissipation capacity to ensure its stability and reliability. Common heat dissipation structures for power modules in motor controllers include straight fins, Pin-Fin needle fins, etc. The straight fin structure is simple and easy to process, which can increase the heat dissipation area and has a small coolant flow resistance, but the turbulence ability and heat dissipation effect are average. Pin-Fin needle fins increase the heat dissipation area and have a strong turbulence effect, but the densely staggered Pin-Fin needle fins make the coolant flow resistance higher and the coolant inlet and outlet pressure drop difference larger. Therefore, how to improve the heat dissipation effect and heat dissipation efficiency of power devices has become a technical problem that needs to be solved urgently.

[0017] In view of this, a heat dissipation device for a power device provided in an embodiment of the present disclosure improves the flow rate and flow rate of the coolant by optimizing the shape and arrangement layout of the corrugated fins provided on the heat dissipation plate, thereby further enhancing the heat dissipation performance.

[0018] See also Figure 1 , Figure 1 A schematic diagram of a heat dissipation device for a power device according to an embodiment of the present disclosure is shown. Figure 1 In the embodiment, the heat dissipation device of the power device may include:

[0019] A heat sink 1, with a power device 3 disposed on one side of the heat sink 1;

[0020] A plurality of corrugated fins 2 are evenly distributed on the other side of the heat sink 1, and are used to form a heat dissipation channel for the coolant to dissipate heat from the power device 3; the horizontal spacing between the corrugated fins 2 in each row is the same, and the vertical spacing between the corrugated fins 2 in each column is the same;

[0021] The shape parameters of the corrugated fins 2 vary with the flow direction of the coolant, and the shape parameters include at least one of the following: fin length, fin thickness, fin bending direction or fin curvature.

[0022] Among them, the relatively smooth sinusoidal corrugations in the corrugated fins can more effectively guide the coolant to flow through the fins, reduce dead water areas, and increase the effective heat exchange area and heat exchange efficiency. Compared with straight fins, corrugated fins can provide a larger surface area, thereby increasing the effective heat exchange area between the coolant and the corrugated fins and improving the heat exchange efficiency. The corrugated fins have a strong flow disturbance ability and promote the formation of turbulence. Enhance the mixing between the coolant and the fins, destroy the thermal boundary layer, and thus improve the efficiency of heat transfer. The evenly distributed corrugated fins and the relatively smooth corrugated shape can more effectively guide the coolant to flow through the fins and reduce the coolant flow resistance.

[0023] See also Figure 2 , Figure 2 A schematic diagram of a corrugated fin according to an embodiment of the present disclosure is shown. Figure 2 In the figure, the fin length X1 of the corrugated fin may refer to the length of the corrugated fin in the horizontal direction (or transverse direction), the fin thickness X2 of the corrugated fin may refer to the thickness of the corrugated fin in the vertical direction (or longitudinal direction), the transverse spacing L1 of the corrugated fin may refer to the spacing between adjacent corrugated fins in the horizontal direction (or transverse direction), the longitudinal spacing L2 of the corrugated fin may refer to the spacing between adjacent corrugated fins in the vertical direction (or longitudinal direction), the fin bending direction of the corrugated fin may refer to the direction of the opening of the corrugated fin, and the fin curvature of the corrugated fin may refer to the rate of change of the direction of the curve on the arc line per unit length, which is used to indicate the degree of bending. A certain space is left between the corrugated fins 3 for the coolant to flow through, and the coolant flows in from the inlet 5 on one side and flows out from the outlet 6 on the other side to form a heat dissipation channel, such as Figure 3 As shown, Figure 3A schematic diagram of a corrugated fin according to an embodiment of the present disclosure is shown. The number of corrugated fins in each row and column in the heat sink is not limited to 12 rows and 10 columns in the figure, and can be set according to actual conditions and needs. The flow rate and flow rate of the coolant can also be improved by adjusting the degree of corrugation curvature and arrangement layout of the corrugated fins to further improve the heat dissipation performance. The corrugated fins can be made of metal materials with good thermal conductivity (such as aluminum or copper), which can quickly conduct the heat energy generated by the power device to the coolant.

[0024] In some embodiments, the corrugated fins include first corrugated fins and second corrugated fins, the first corrugated fins are staggered, and the second corrugated fins are aligned.

[0025] The first corrugated fins of adjacent rows are arranged in a staggered distribution, which can increase the contact area and path length between the heat dissipation components and the coolant, thereby improving the heat exchange efficiency. The staggered distribution also helps to promote the turbulence of the coolant, further enhancing the heat dissipation effect, ensuring that the electronic devices can maintain a low operating temperature under high load conditions, and improving the stability and reliability of the system.

[0026] In some embodiments, the corrugated fins include adjacent third corrugated fins and fourth corrugated fins, and the fin bending directions of the third corrugated fins and the fourth corrugated fins are different, so that the plurality of corrugated fins form a wavy heat dissipation passage.

[0027] The wavy heat dissipation path can increase the height of the crest and trough of the coolant flow, increase the contact area between the coolant and the corrugated fins, and improve the heat exchange efficiency. Moreover, the bending direction of the corrugation changes alternately, which can form a more complex corrugation path in the heat dissipation space, increase the corrugation frequency, and improve the heat exchange efficiency.

[0028] In some embodiments, the corrugated fins include a fifth corrugated fin and a sixth corrugated fin, and the fifth corrugated fin and the sixth corrugated fin have different fin curvatures.

[0029] Among them, changing the curvature can change the surface area of ​​the fins, the turbulence of the coolant, optimize the flow path and enhance the structural stability, so that the radiator can achieve higher heat exchange efficiency under the same conditions, thereby improving the heat dissipation performance. The fifth corrugated fin and the sixth corrugated fin can be arranged in the first area and the second area of ​​the heat sink, the first area is close to the coolant inlet, and the second area can be close to the coolant touch. The fin curvature of the sixth corrugated fin can be set to be smaller than the fin curvature of the fifth corrugated fin, so that the number of the sixth corrugated fins in each column of the second area is greater than the number of the fifth corrugated fins in each column of the first area, increasing the contact area between the coolant and the fins, and the turbulence of the coolant, thereby improving the heat dissipation effect.

[0030] In some embodiments, the shape parameters of the corrugated fins vary with the flow direction of the coolant, including:

[0031] The length of the fin decreases in a stepwise or gradually manner along the flow direction, so as to increase the ripple frequency of the heat dissipation passage.

[0032] Among them, the surface area of ​​the corrugated fin can be increased by reducing the fin length, and the number of rows of corrugated fins can be increased within the same length range, thereby increasing the frequency and density of the corrugations to increase the heat exchange efficiency. Step reduction can refer to the fin length of one row being smaller than the fin length of another row. For example, the fin length a of a row of corrugated fins close to the coolant inlet can be smaller than the fin length b of a row of corrugated fins away from the coolant inlet. It should be understood that the step change can be set as needed at this time and is not limited here. Gradually reducing can refer to the fin length of each row of corrugated fins gradually decreasing along the flow direction to optimize the heat exchange efficiency.

[0033] In some embodiments, the shape parameters of the corrugated fins vary with the flow direction of the coolant, including:

[0034] The curvature of the fin decreases in a stepwise or gradually manner along the flow direction, so as to increase the height of the crest and / or trough of the heat dissipation path.

[0035] Among them, the curvature of the fin decreases stepwise or gradually decreases along the flow direction. On the one hand, the number of rows of corrugated fins can be increased within the same length range to extend the heat dissipation channel and increase the contact area; on the other hand, the vertical distance between the crest and the trough can be increased to increase the turbulence of the coolant, thereby further improving the heat dissipation effect.

[0036] In some embodiments, the fin thickness of the corrugated fin located at a crest or a trough of the heat dissipation path is greater than the fin thickness of the corrugated fin located at a non-crest or a trough.

[0037] Among them, locally increasing the thickness at the crests and troughs can enhance the structural strength, while thinning other parts to increase the frequency and density of the corrugations, increase the contact area between the coolant and the corrugated fins and the turbulence of the coolant, and improve the heat dissipation effect.

[0038] In some embodiments, the fin length is greater than 2 times the fin thickness.

[0039] Among them, the fin length is greater than 2 times the fin thickness, which can optimize the performance and structural strength of the radiator. Longer fins can provide a larger surface area, thereby increasing the contact area with the surrounding air and improving the heat dissipation efficiency; they can also better guide the airflow so that it is evenly distributed on the surface of the radiator, thereby improving the heat exchange efficiency. Compared with the longer fin length, the narrower fin thickness can make the fin less likely to bend or deform when subjected to external force, thereby improving the stability of the overall structure; and can reduce the resonance effect and avoid additional noise or structural damage in a vibration environment. The corrugated fins designed in this way not only improve the performance of the radiator, but also ensure the stability of the structure and the economy of manufacturing. Specifically, each corrugated fin can be the same size, the length of the corrugated fin is X1, and the width is X2, and the relationship between the two is satisfied: X1>2X2. The heat generated by the power device 3 is transferred to the corrugated fin 2 via the heat sink 1, and a coolant flows between the corrugated fins 2 to take away the heat by forced convection heat exchange.

[0040] In some embodiments, the edges of the corrugated fins are rounded or chamfered.

[0041] Among them, chamfering or rounding the edges of the corrugated fins can reduce eddy currents in the flow of the coolant, increase the flow velocity and flow rate, and help improve the heat dissipation effect.

[0042] According to an embodiment of the present disclosure, a double-layer heat sink is also proposed, comprising two relatively arranged heat dissipation devices according to the embodiment of the present disclosure; wherein the corrugated fins of the two heat dissipation devices are separated by an isolation member to form two heat dissipation passages respectively.

[0043] In some embodiments, the double-layer heat sink further comprises:

[0044] An input terminal, used for inputting coolant;

[0045] An output end, used for outputting the coolant;

[0046] A connecting hole, used to connect the heat dissipation paths of the two heat dissipation devices;

[0047] The coolant enters the double-layer radiator through the input end, passes through the two heat dissipation paths, and then flows out through the output end.

[0048] Specifically, see Figure 4 , Figure 4 A schematic diagram of a double-layer heat sink according to an embodiment of the present disclosure is shown. Figure 4In the figure, the double-layer radiator includes two heat dissipation devices 4-1 and 4-2 arranged opposite to each other according to the embodiment of the present disclosure, and the heat dissipation device 4-1 is provided with a power device 4-3, and similarly, the heat dissipation device 4-2 is also provided with a power device. The corrugated fins of the two heat dissipation devices 4-1 and 4-2 are separated by an isolating member (e.g., a water-cooled isolating plate, not shown in the figure), and two heat dissipation paths are formed respectively. The double-layer radiator also includes an input end 4-4 for inputting a coolant (e.g., water); an output end 4-5 for outputting the coolant; and a connecting hole, which can be provided in the body 4-6 of the double-layer radiator, for connecting the heat dissipation paths of the two heat dissipation devices. The corrugated fins of the heat dissipation devices 4-1 and 4-2 are accommodated in the internal space of the body 4-6 and separated by an isolating member, for example, separated into two layers, upper and lower. The coolant can enter the double-layer radiator through the input end 4-4, pass through the heat dissipation path of the heat dissipation device 4-1, enter the heat dissipation path of the heat dissipation device 4-2 through the connecting hole, and then flow out through the output end 4-5. It should be understood that the positions of the input terminal 4-4 and the output terminal 4-5 can be interchanged, that is, the input terminal 4-4 is set at the lower layer and the output terminal 4-5 is set at the upper layer, then the coolant can enter the double-layer radiator through the input terminal 4-4, pass through the heat dissipation path of the heat dissipation device 4-2, enter the heat dissipation channel of the heat dissipation device 4-1 through the connecting hole, and then flow out through the output terminal 4-5.

[0049] It can be seen that the double-layer radiator according to the embodiment of the present disclosure utilizes the upper and lower double-layer water cooling structure and the shape-changing heat dissipation fin structure to ensure the thermal stability of the double-layer radiator and the uniformity of the temperature of each component, while ensuring the economy of the overall structure processing and further improving the heat dissipation effect.

[0050] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

[0051] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present disclosure difficult to understand, the known power / ground connections to the integrated circuit (IC) chips and other components may or may not be shown in the provided figures. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present disclosure difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform on which the embodiments of the present disclosure will be implemented (that is, these details should be fully within the scope of understanding of those skilled in the art). Where specific details (e.g., circuits) are set forth to describe exemplary embodiments of the present disclosure, it is apparent to those skilled in the art that the embodiments of the present disclosure can be implemented without these specific details or with changes in these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0052] Although the present disclosure has been described in conjunction with specific embodiments of the present disclosure, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0053] The embodiments of the present disclosure are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A heat dissipation device for a power device, characterized in that: include: A heat sink, with a power device disposed on one side of the heat sink; A plurality of corrugated fins are evenly distributed on the other side of the heat sink, and are used to form a heat dissipation channel for the coolant to dissipate heat from the power device; the horizontal spacing between the corrugated fins in each row is the same, and the vertical spacing between the corrugated fins in each column is the same; The shape parameters of the corrugated fins vary with the flow direction of the coolant, and the shape parameters include at least one of the following: fin length, fin thickness, fin bending direction or fin curvature.

2. The device according to claim 1, characterized in that The corrugated fins include first corrugated fins and second corrugated fins, wherein the first corrugated fins are staggered and the second corrugated fins are aligned.

3. The device according to claim 1, characterized in that The corrugated fins include adjacent third corrugated fins and fourth corrugated fins. The third corrugated fins and the fourth corrugated fins have different fin bending directions, so that the plurality of corrugated fins form a wavy heat dissipation passage.

4. The device according to claim 1, characterized in that The corrugated fins include a fifth corrugated fin and a sixth corrugated fin, and the fifth corrugated fin and the sixth corrugated fin have different fin curvatures.

5. The device according to claim 1, characterized in that The shape parameters of the corrugated fins vary with the flow direction of the coolant, including: The length of the fin decreases in steps or gradually along the flow direction to increase the ripple frequency of the heat dissipation path; And / or, the curvature of the fin decreases in a stepwise or gradually manner along the flow direction, so as to increase the height of the crest and / or trough of the heat dissipation path.

6. The device according to claim 1, characterized in that The fin thickness of the corrugated fin located at a crest or a trough of the heat dissipation passage is greater than the fin thickness of the corrugated fin located at a non-crest or a non-trough.

7. The device according to claim 1, characterized in that The fin length is greater than twice the fin thickness.

8. The device according to claim 1, characterized in that The edges of the corrugated fins are designed with rounded corners or chamfered corners.

9. A double-layer radiator, characterized in that: It comprises two heat dissipation devices according to any one of claims 1 to 8 which are arranged opposite to each other; wherein the corrugated fins of the two heat dissipation devices are separated by an isolating member to form two heat dissipation passages respectively.

10. The double-layer radiator according to claim 9, characterized in that: Also includes: An input terminal, used for inputting coolant; An output end, used for outputting the coolant; A connecting hole, used to connect the heat dissipation paths of the two heat dissipation devices; The coolant enters the double-layer radiator through the input end, passes through the two heat dissipation paths, and then flows out through the output end.

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