A copper-aluminum base composite heat sink

Abstract

The utility model relates to a copper-aluminium base composite radiator, including substrate and three -dimensional heat abstractor, the substrate includes the copper plate and aluminium plate welded as a whole, three -dimensional heat abstractor is made of aluminium -containing material and is welded on the outside of aluminium plate, three -dimensional heat abstractor includes a plurality of liquid inlets arranged on one side and a plurality of liquid outlets arranged on the other side, and the liquid inlet and the liquid outlet are connected by a three -dimensional network structure flow channel. High heat exchange efficiency, light weight, high welding rate, corrosion -resistant effect has, easy manufacturing, and the cost is lower.

Description

Technical Field

[0001] This utility model relates to the field of radiator manufacturing technology, and in particular to a copper-aluminum base composite radiator. Background Technology

[0002] In electronic devices, the heat generated by high-power components (such as CPUs and GPUs) needs to be dissipated promptly to prevent performance degradation or even damage due to overheating. Heat sinks, as critical heat dissipation components, typically achieve heat conduction and diffusion through a base plate made of highly thermally conductive metal materials (such as copper and aluminum) and a heat dissipation structure. Traditional heat dissipation structures include pin-type and fin-type designs, as well as three-dimensional heat exchange structures with larger surface areas, which are therefore widely adopted by many manufacturers.

[0003] Chinese patent CN103499077A discloses a copper-aluminum composite LED lamp heat sink, which includes an aluminum heat sink body and thermally conductive copper fins. The thermally conductive copper fins are embedded in the thermally conductive surface of the aluminum heat sink body, which is divided into a substrate and heat dissipation fins, both of which are made of aluminum. This structure has an insufficient heat exchange area, and aluminum's heat transfer efficiency is lower than that of copper, resulting in a less than ideal heat transfer efficiency for this composite heat sink.

[0004] Chinese patent CN215345601U discloses a heat dissipation structure, including a substrate and a heat exchange component. The heat exchange component consists of at least two stacked heat sinks and has a three-dimensional flow channel structure inside. The substrate can be made of copper or aluminum, while the material of the heat exchange component is undefined. Generally, the substrate and heat exchange component are made of the same material for better compatibility. However, if both are made of copper, although the thermal conductivity is better, the weight is heavier, and the copper surface requires surface treatment before use, otherwise it is easily corroded. If both are made of aluminum, the surface will passivate on its own, saving the cost of surface treatment, but the heat exchange efficiency is generally lower. If the substrate is made of copper and the heat exchange component uses stacked aluminum heat sinks, the weldability between the heat sinks with through holes and the substrate is not good, which can easily lead to open welds and impaired heat conduction, and post-processing is troublesome.

[0005] Therefore, a new type of copper-aluminum base composite radiator is urgently needed to solve the above problems. Utility Model Content

[0006] The main purpose of this utility model is to provide a copper-aluminum base composite radiator, which has high heat exchange efficiency, light weight, high welding rate, anti-corrosion function, convenient manufacturing and lower cost.

[0007] This utility model achieves the above-mentioned objective through the following technical solution: a copper-aluminum base composite heat sink, comprising a base plate and a three-dimensional heat dissipation part, wherein the base plate comprises a copper plate and an aluminum plate welded together, the three-dimensional heat dissipation part is made of aluminum-containing material and welded to the outside of the aluminum plate, the three-dimensional heat dissipation part comprises a plurality of liquid inlets on one side and a plurality of liquid outlets on the other side, wherein the liquid inlets and the liquid outlets are connected by a flow channel with a three-dimensional network structure.

[0008] Specifically, the copper plate and the aluminum plate have the same area, and the copper plate and the aluminum plate are welded face to face to form a single unit.

[0009] Specifically, the area of ​​the copper plate is smaller than that of the aluminum plate, the copper plate is embedded on the other side of the aluminum plate, and the three-dimensional heat dissipation part is located within the upper projection range of the copper plate.

[0010] Specifically, the three-dimensional heat dissipation part is made of 1-series, 3-series, 6-series, 8-series aluminum alloys or special aluminum alloys.

[0011] Specifically, the three-dimensional heat dissipation part is made of multiple layers of heat dissipation thin plates stacked and welded together. The odd-numbered and even-numbered layers of the heat dissipation thin plates have the same structure but are inverted. The heat dissipation thin plates are provided with several through holes and a notch on one side. Each through hole is connected to the through hole or notch of the adjacent layer to form the flow channel. The notch on one side is used as the liquid inlet, and the notch on the other side is used as the liquid outlet.

[0012] Specifically, the substrate has a housing surrounding the three-dimensional heat dissipation part, and the housing and the substrate surround to form a cooling cavity. The housing has a cavity inlet on the side near the liquid inlet and a cavity outlet on the side near the liquid outlet.

[0013] Furthermore, the housing is made of an aluminum-containing material, and the edges of the housing are welded to the edges of the aluminum plate.

[0014] The beneficial effects of this utility model's technical solution are: 1. Both the aluminum plate and the three-dimensional heat dissipation part have a high aluminum content, making the heat sink lighter than an all-copper structure.

[0015] 2. The aluminum plate and the three-dimensional heat dissipation unit have good compatibility, avoiding the problem of low welding rate when the three-dimensional heat dissipation unit is directly connected to the copper plate.

[0016] 3. The surface of aluminum materials is naturally passivated during processing, which plays a role in corrosion prevention. Compared with copper, which requires surface treatment, aluminum is easier to manufacture and has a lower cost. Attached Figure Description

[0017] Figure 1 This is a perspective view of the copper-aluminum base composite heat sink in Example 1; Figure 2 This is an exploded view of the three-dimensional heat dissipation unit; Figure 3 for Figure 2 A magnified view of a portion of position A in the middle; Figure 4 This is a cross-sectional view of the copper-aluminum base composite heat sink in Example 2; Figure 5 This is a perspective view of the copper-aluminum base composite heat sink in Example 3.

[0018] The diagram is marked as follows: 1-Substrate, 11-Copper plate, 12-Aluminum plate; 2-Three-dimensional heat dissipation unit, 201-Liquid inlet, 202-Liquid outlet, 203-Flow channel, 21-Heat dissipation plate, 211-Through hole, 212-Notch; 3-Shell, 31-Cooling cavity, 32-Cavity inlet, 33-Cavity outlet. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments.

[0020] Example 1: like Figure 1 and Figure 2 As shown, a copper-aluminum base composite heat sink includes a base plate 1 and a three-dimensional heat dissipation section 2. The base plate 1 includes a copper plate 11 and an aluminum plate 12 welded together. The three-dimensional heat dissipation section 2 is made of aluminum-containing material and welded to the outside of the aluminum plate 12. The three-dimensional heat dissipation section 2 includes a plurality of liquid inlets 201 on one side and a plurality of liquid outlets 202 on the other side. The liquid inlets 201 and liquid outlets 202 are connected by a three-dimensional network structure of flow channels 203. The copper plate 11 and the aluminum plate 12 have the same area and are welded together face to face.

[0021] The outer surface of the copper plate 11 is a heat-absorbing surface, on which conductive devices can be attached to absorb the heat generated during operation. Because the conductive devices are mostly made of copper, they have good compatibility with the copper plate 11, allowing for more thorough welding and faster heat conduction. The copper plate 11 and the aluminum plate 12 can be joined together by diffusion welding, allowing heat to be conducted from the copper plate 11 to the aluminum plate 12, and then to the three-dimensional heat sink 2. The flow channels 203 in the three-dimensional heat sink 2 are zigzag, generating turbulence as the cooling medium passes through them, thus transferring heat more quickly from the three-dimensional heat sink 2 to the cooling medium. The three-dimensional heat sink 2 has a very high specific surface area, resulting in higher heat exchange efficiency than ordinary heat exchange needles. Both the aluminum plate 12 and the three-dimensional heat dissipation part 2 have a high aluminum content. Firstly, this makes the heat sink lighter than an all-copper structure. Secondly, the aluminum plate 12 and the three-dimensional heat dissipation part 2 have better compatibility, avoiding the problem of low welding rate when the three-dimensional heat dissipation part 2 is directly connected to the copper plate 11. Thirdly, the surface of the aluminum material will naturally passivate during the processing, which plays a role in corrosion prevention. Compared with copper, which requires surface treatment, it is easier to manufacture and has a lower cost.

[0022] The three-dimensional heat dissipation part 2 is made of 1-series, 3-series, 6-series, 8-series aluminum alloys or special aluminum alloys.

[0023] Because of its high aluminum content, aluminum alloy has a good bonding rate with aluminum plate 12, avoiding reduced heat conduction due to voids at the interface. While the thermal conductivity of ordinary aluminum and aluminum alloys is less than 50% of that of copper, some specialized aluminum alloys on the market can achieve thermal conductivity close to that of copper while maintaining low density. Therefore, their use in the three-dimensional heat dissipation unit 2 can achieve better overall heat dissipation performance.

[0024] like Figure 2 and Figure 3 As shown, the three-dimensional heat dissipation part 2 is formed by stacking and welding multiple layers of heat dissipation thin plates 21. The odd-numbered layers of the heat dissipation thin plates 21 have the same structure as the even-numbered layers but are inverted. The heat dissipation thin plates 21 are provided with several through holes 211 and a notch 212 on one side. Each through hole 211 is connected to the through hole 211 or the notch 212 of the adjacent layer to form a flow channel 203. The notch 212 on one side is used as a liquid inlet 201, and the notch 212 on the other side is used as a liquid outlet 202.

[0025] The heat dissipation plates 21 consist of many sheet-like parts with a thickness of 0.3-5.0 mm. To ensure efficient heat exchange between the heat dissipation plates 21, welding without adding other solder is preferred. The overall structure of the three-dimensional heat dissipation unit 2 is generally cubic. The stacked structure makes the flow channel 203 easy to process and the structure relatively controllable. The through holes 211 and notches 212 can be completed by stamping or milling the heat dissipation plates 21. Since the odd-numbered layers and even-numbered layers are only different in direction but have the same structure, they can be manufactured using the same set of molds or processing programs. During stacking, the vertical projection of the through holes and notches on the odd-numbered heat dissipation plates will overlap to a certain extent with the through holes and notches on the even-numbered heat dissipation plates. Therefore, the cooling medium will continuously pass through different through holes or notches to reach the other side of the flow channel 203. As long as a three-dimensional flow channel 203 can be formed, the structure of the through holes 211 and notches 212 can be flexibly adjusted. For example, the through holes 211 can be oblique or L-shaped.

[0026] Example 2: like Figure 4 As shown, the difference from Embodiment 1 is that: a housing 3 surrounding the three-dimensional heat dissipation part 2 is provided on the substrate 1, and the housing 3 and the substrate 1 surround to form a cooling cavity 31. The housing 3 has a cavity inlet 32 ​​on the side near the liquid inlet 201 and a cavity outlet 33 on the side near the liquid outlet 202. The housing 3 is made of aluminum-containing material, and the edge of the housing 3 is welded to the edge of the aluminum plate 12.

[0027] A copper-aluminum base composite heat sink with a housing 3 is generally called a water-cooled box. The cooling medium flows within the cooling chamber 31, thus restricting its flow to the interior of the three-dimensional heat dissipation section 2. The liquid inlet direction of the cooling chamber 31 is before the liquid inlet 201, so this side must have a chamber inlet 32; the liquid outlet direction is after the liquid outlet 202, so this side must have a chamber outlet 33. Using aluminum-containing material for the housing 3 not only makes the water-cooled box lighter but also allows for better compatibility with the aluminum plate 12, enabling the housing 3 to be firmly welded to the upper surface of the aluminum plate 12. Because the copper plate 11 is completely on the opposite side, it does not affect the rigidity of the housing 3.

[0028] Example 3: like Figure 5 As shown, the difference from Embodiment 1 is that the area of ​​the copper plate 11 is smaller than that of the aluminum plate 12, the copper plate 11 is embedded on the other side of the aluminum plate 12, and the three-dimensional heat dissipation part 2 is located within the upper projection range of the copper plate 11.

[0029] The heat absorbed from the copper plate 11 can be conducted to the three-dimensional heat sink 2 through the shortest distance (i.e., the thickness of the thinnest part of the aluminum plate 12), thereby achieving higher heat dissipation efficiency and reducing the copper content of the entire substrate 1, making the entire heat sink lighter.

[0030] In Example 3, a shell 3 can also be added to form a water-cooled box structure.

[0031] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A copper-aluminum base composite radiator, characterized in that: The device includes a substrate and a three-dimensional heat dissipation unit. The substrate comprises a copper plate and an aluminum plate welded together. The three-dimensional heat dissipation unit is made of aluminum-containing material and welded to the outside of the aluminum plate. The three-dimensional heat dissipation unit includes several liquid inlets on one side and several liquid outlets on the other side. The liquid inlets and the liquid outlets are connected by a three-dimensional network structure of flow channels. The three-dimensional heat dissipation unit is formed by stacking and welding multiple layers of heat dissipation thin plates. The odd-numbered layers of the heat dissipation thin plates have the same structure as the even-numbered layers but are inverted. The heat dissipation thin plates are provided with several through holes and a notch on one side. Each through hole communicates with the through hole or notch of the adjacent layer to form the flow channel. The notch on one side serves as the liquid inlet, and the notch on the other side serves as the liquid outlet.

2. The copper-aluminum base composite radiator according to claim 1, characterized in that: The copper plate and the aluminum plate have the same area, and the copper plate and the aluminum plate are welded face to face to form a whole.

3. The copper-aluminum base composite radiator according to claim 1, characterized in that: The area of ​​the copper plate is smaller than the area of ​​the aluminum plate on one side of the three-dimensional heat dissipation part, and the copper plate is embedded in the other side of the aluminum plate.

4. The copper-aluminum base composite radiator according to claim 1, characterized in that: The three-dimensional heat dissipation unit is made of 1-series, 3-series, 6-series, 8-series aluminum alloys or special aluminum alloys.

5. The copper-aluminum base composite radiator according to claim 1, characterized in that: The substrate is provided with a housing surrounding the three-dimensional heat dissipation part. The housing and the substrate surround to form a cooling cavity. The housing has a cavity inlet on the side near the liquid inlet and a cavity outlet on the side near the liquid outlet.

6. The copper-aluminum base composite radiator according to claim 5, characterized in that: The housing is made of aluminum-containing material, and the edges of the housing are welded to the edges of the aluminum plate.

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