Fin radiator for power device

Abstract

A fin radiator for a power device comprises a substrate used for contacting with a heating source of the power device; the special-shaped fins are integrally formed on the base plate, a special-shaped flow channel is formed between every two adjacent special-shaped fins, each special-shaped flow channel comprises a first flow channel body and a second flow channel body which are arranged in a circulating mode, and the sectional area of each first flow channel body and the sectional area of each second flow channel body are sequentially increased in the flowing direction. The maximum sectional area of the first flow channel is larger than the minimum sectional area of the second flow channel, and the maximum sectional area of the second flow channel is larger than the minimum sectional area of the first flow channel. According to the heat exchanger, the design of the special-shaped fins is adopted, the design of variable sectional areas is adopted for the special-shaped flow channels between the adjacent special-shaped fins, the effect of continuously accelerating fluid is achieved, pulsation heat exchange is formed through regular disturbance of the fluid, meanwhile, the heat exchange area is increased, and the convective heat exchange effect is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation, and particularly relates to a fin radiator for power devices. Background Art

[0002] Power devices generate a large amount of heat during operation, which will affect the stability of related electronic devices. Therefore, in order to improve the service life of related electronic devices, sufficient cooling capacity needs to be provided.

[0003] Air-cooled heat dissipation technology is one of the commonly selected heat dissipation methods for electronic devices. Among them, flat heat dissipation fins are widely used due to their simple structure, mature manufacturing process, and low cost. The fin structure has an important impact on its heat dissipation performance and the pressure drop of the heat exchange gas. However, the heat dissipation process of flat heat dissipation fins is single, and the heat exchange flow channel is too simple. It only relies on the rectangular areas on both sides of the fins to exchange heat with the outside, resulting in low heat exchange efficiency and large pressure drop of the heat exchange gas.

[0004] Another type of corrugated fin has an improvement effect on the convection velocity and heat exchange area. However, the process of separately preparing the fins and the substrate and then assembling them into a shape through a brazing process is relatively complex, and the production efficiency is low. Summary of the Utility Model

[0005] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a fin radiator for power devices.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A fin radiator for power devices, which includes:

[0008] A substrate for contacting the heat source of the power device;

[0009] A number of special-shaped fins integrally formed on the substrate, and special-shaped flow channels are formed between adjacent special-shaped fins. The special-shaped flow channels include a first flow channel and a second flow channel arranged in a cycle. The cross-sectional areas of the first flow channel and the second flow channel gradually increase along the flow direction. The maximum cross-sectional area of the first flow channel is larger than the minimum cross-sectional area of the second flow channel, and the maximum cross-sectional area of the second flow channel is larger than the minimum cross-sectional area of the first flow channel.

[0010] Adjacent special-shaped fins are arranged staggeredly.

[0011] The special-shaped fins change in a broken line along the flow direction.

[0012] Jagged surfaces are provided on both sides of the special-shaped fins and are arranged staggeredly in a mirror image.

[0013] The jagged surface is composed of a long hypotenuse and a short hypotenuse arranged in a cycle.

[0014] The included angle at the connection between the first flow channel and the second flow channel is greater than 90°.

[0015] The cross-sectional area at the connection between the first flow channel and the second flow channel decreases from large to small.

[0016] Each special-shaped flow channel is arranged independently.

[0017] Advantages of the present utility model: The present application adopts a special-shaped fin design, so that the special-shaped flow channels between adjacent special-shaped fins adopt a design with a variable cross-sectional area, which has a continuous accelerating effect on the fluid, forms pulsating heat transfer on the regular disturbance of the fluid, and at the same time increases the heat transfer area, enhancing the convective heat transfer effect. Description of the Drawings

[0018] Figure 1 It is a schematic application diagram of the present utility model.

[0019] Figure 2 It is a schematic structural diagram of the present utility model.

[0020] Figure 3 It is a front view of the present utility model.

[0021] Figure 4 It is Figure 3 an enlarged schematic diagram of part A in

[0022] Figure 5 It is a partial schematic diagram of the special-shaped fins of the present utility model.

[0023] Figure 6 It is a schematic diagram of the special-shaped flow channel formed by non-offset special-shaped fins.

[0024] Figure 7 It is a schematic diagram of the special-shaped flow channel formed by offset special-shaped fins. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] The utility model discloses a fin radiator for power devices, which is mainly used for dissipating heat of the power device 200. At the same time, a fan 300 can be combined to enable heat to be quickly discharged from the flow channel of the fin radiator 100 for power devices.

[0028] The fin radiator 100 for power devices comprises a substrate and a plurality of special-shaped fins 200 integrally formed on the substrate. By adopting the die extrusion molding production method, a plurality of special-shaped fins are extruded synchronously with the bottom plate, realizing for the first time the extrusion production of the special-shaped fins and the bottom plate of the radiator integrally formed, and having a high production efficiency.

[0029] As Figure 1 shown, the substrate 110 is used for contacting the heat source of the power device 200, and its lower surface is flat, which is better for contacting the power device. The power device can be a device with a large amount of heat generation such as a field effect transistor.

[0030] As Figure 2 and Figure 3 shown, a plurality of special-shaped fins 120 are integrally formed on the substrate 110, and a special-shaped flow channel 130 is formed between adjacent special-shaped fins 120. The special-shaped flow channel 130 includes a first flow channel 131 and a second flow channel 132 arranged in a cycle. The cross-sectional areas of the first flow channel 131 and the second flow channel 132 gradually increase along the flow direction. The maximum cross-sectional area of the first flow channel 131 is greater than the minimum cross-sectional area of the second flow channel 132, and the maximum cross-sectional area of the second flow channel 132 is greater than the minimum cross-sectional area of the first flow channel 131.

[0031] The cross-sectional area mentioned herein refers to the cross-section perpendicular to the two-sided special-shaped fins. As Figure 7 in Figure 4 S1, S2, S3, S4, S5, taking Figure 7 as an example, a special-shaped flow channel is formed between the upper and lower special-shaped fins. Among them, the first flow channel 131 is the space between the long hypotenuse of the lower special-shaped fin and the short hypotenuse of the upper special-shaped fin, and the second flow channel 132 is the space between the long hypotenuse of the upper side and the short hypotenuse of the lower side. The two are connected, and at the same time, an angle greater than 90° is formed between the two flow channels. As

[0032] Further, adjacent special-shaped fins 120 are arranged in a staggered manner. As Figure 6 shown, it is a design of non-offset special-shaped fins, while Figure 7 is a design of offset special-shaped fins. As Figure 7As shown, there is a dislocation distance between the trough of the upper special-shaped fin and the adjacent peak of the lower special-shaped fin, while Figure 6 in the non-dislocated special-shaped fins, the troughs are on the same axis as the peaks of the lower special-shaped fins. By adjusting the dislocation distance formed by the two side walls of the variable cross-section flow channel, a pulsating heat transfer effect is formed, further enhancing the convective heat transfer.

[0033] The special-shaped fin 120 changes in a zigzag shape along the flow direction. As Figure 5 shown, serrated surfaces are provided on both sides of the special-shaped fin 120 and are mirror-symmetrically arranged, and the two serrated surfaces are staggered. The serrated surface is composed of a long hypotenuse 121 and a short hypotenuse 122 arranged in a cycle. The length of the long hypotenuse is close to twice that of the short hypotenuse. Thus, when dislocated, the two ends of the long hypotenuse are respectively located on the long hypotenuses on both sides of the short hypotenuse of the special-shaped fin on the other side. At the same time, the inclination angle of the short hypotenuse is different from that of the long hypotenuse, so that the flow channel formed between the two shows a trend of becoming smaller or larger, realizing the variable cross-section design.

[0034] Each special-shaped flow channel 130 is independently arranged, so that the air blown by the fan flows in each special-shaped flow channel. At the same time, the cross-sectional area of the flow channel adopts a cyclic manner of gradually decreasing - gradually increasing - gradually decreasing - gradually increasing, so that the flow channel continuously accelerates the fluid therein.

[0035] Through the simulation experiment on the embodiment proposed by the present utility model and the flat heat dissipation fins, referring to Figure 1 , 4 devices are arranged at the bottom of the radiator, and a fan is arranged on one side of the flow channel.

[0036] By comprehensively using the variable cross-sectional area of the flow channel and the dislocation design of the two side walls, the flow velocity can be increased by more than 20%.

[0037]

[0038] By comprehensively using the variable cross-sectional area of the flow channel and the dislocation design of the two side walls, the temperature of the power device is reduced by more than 5°C.

[0039]

[0040] This fin radiator adopts the design of variable cross-sectional area flow channels between fins, and at the same time adjusts the dislocation distance formed by the two side walls of the variable cross-sectional area flow channel, so that this fin radiator has the advantages of increasing the flow velocity, increasing the heat transfer area and pulsating heat transfer, etc. It can increase the flow velocity between fins by more than 20%, reduce the temperature of the power device by 5 o °C or more, and significantly improve the convective heat transfer effect.

[0041] The embodiments should not be regarded as limitations of the present utility model, but any improvements made based on the spirit of the present utility model should be within the protection scope of the present utility model.

Claims

1. A fin heat sink for a power device, characterized in that: It includes: A substrate (110) for contacting the heat source of the power device (200); A plurality of special-shaped fins (120) integrally formed on the substrate (110), and a special-shaped flow channel (130) is formed between adjacent special-shaped fins (120). The special-shaped flow channel (130) includes a first flow channel (131) and a second flow channel (132) arranged in a cycle. The cross-sectional areas of the first flow channel (131) and the second flow channel (132) gradually increase along the flow direction. The maximum cross-sectional area of the first flow channel (131) is greater than the minimum cross-sectional area of the second flow channel (132), and the maximum cross-sectional area of the second flow channel (132) is greater than the minimum cross-sectional area of the first flow channel (131).

2. The finned heat sink for a power device according to claim 1, characterized in that: Adjacent special-shaped fins (120) are arranged staggeredly.

3. A fin heat sink for a power device according to claim 1 or 2, characterized in that: The special-shaped fins (120) change in a zigzag shape along the flow direction.

4. The fin heat sink for a power device according to claim 3, wherein: Jagged surfaces are provided on both sides of the special-shaped fins (120) and are arranged in a mirror image, and the two jagged surfaces are arranged staggeredly.

5. The fin heat sink for a power device according to claim 4, wherein: The jagged surface is composed of a long hypotenuse (121) and a short hypotenuse (122) arranged in a cycle.

6. The fin heat sink for a power device according to claim 1, wherein: The included angle at the connection of the first flow channel (131) and the second flow channel (132) is greater than 90°.

7. A fin heat sink for a power device according to claim 1 or 6, characterized in that: The cross-sectional area at the connection of the first flow channel (131) and the second flow channel (132) decreases from large to small.

8. The fin heat sink for a power device according to claim 7, wherein: Each special-shaped flow channel (130) is independently arranged.

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