High-power multi-aperture capillary core composite structure temperature equalizing plate

Abstract

The utility model discloses a high-power multi-aperture capillary core composite structure uniform temperature plate which comprises a bottom plate, a first capillary core area, a second capillary core area and a cover plate, the first capillary core area and the second capillary core area are formed on the bottom plate in a sintering mode, and the first capillary core area is located in the center of the bottom plate and covers a heat source area. The first capillary core area is located on the bottom plate, the second capillary core area is located on other capillary core areas, except the first capillary core area, on the bottom plate, the aperture of the first capillary core area is 20-40 micrometers, the aperture of the second capillary core area is 100 micrometers or above, a plurality of supporting columns are evenly distributed on the bottom plate, the bottom plate, the supporting columns and the cover plate form a sealed cavity through vacuum welding, and the bottom plate is located in the sealed cavity. And a liquid working medium is filled in the cavity. Through the use of the multi-aperture capillary core composite structure, not only can the evaporation and gasification effect be ensured to be better, but also the backflow of a working medium is facilitated, and the use of high heat flux and high power consumption is met.

Description

Technical Field

[0001] This utility model relates to the technical field of heat dissipation elements for heat exchange plates. More specifically, this utility model relates to a high-power, multi-pore capillary core composite structure heat exchange plate. Background Technology

[0002] The vapor chamber operates on the principle of gas-liquid phase change. Inside the vapor chamber is a microstructured vacuum cavity. The working fluid undergoes liquid-phase vaporization in the low-vacuum environment, absorbing heat and rapidly expanding in volume, quickly filling the entire cavity. When it comes into contact with a cooler region, the vapor phase condenses, releasing heat. The condensed liquid phase then flows back to the evaporation heat source through capillary action in the microstructure. This entire process repeats continuously within the cavity, with constant rapid heat exchange and phase change, enabling rapid heat conduction and diffusion.

[0003] The pore size of the capillary wick affects the heat dissipation effect of the vapor chamber. Small-diameter capillary wicks have a porosity of approximately 35% to 40%, suitable for applications with heat flux densities higher than 50 W / cm². However, if the entire capillary wick uses this pore size, the small porosity leads to high resistance to backflow, making it difficult for the working fluid to flow back and resulting in a short heat transfer distance. Large-diameter capillary wicks have a porosity of 55% to 60%, facilitating fluid backflow and allowing for longer heat transfer distances. However, under high heat flux density conditions, they are prone to burning out and are only suitable for lower heat flux densities. For heat dissipation applications with high heat flux densities (exceeding 100 W / cm²) and high power consumption (a single heat source with a heat dissipation power greater than 200 W, or a heat flux density exceeding 50 W / cm²), how to design the vapor chamber structure to meet the requirements is the technical problem this application aims to solve. Currently, no good solution has been disclosed in the existing technology. Utility Model Content

[0004] One objective of this invention is to provide a high-power multi-pore capillary wick composite structure heat spreader. By using the multi-pore capillary wick composite structure, it is possible to ensure good evaporation and vaporization effect, and facilitate the reflux of the working fluid, thus meeting the requirements of high heat flux density and high power consumption.

[0005] To address the aforementioned technical problems, this utility model provides a high-power multi-pore capillary composite heat spreader, comprising a base plate, a first capillary region and a second capillary region sintered on the base plate, and a cover plate. The first capillary region is located at the center of the base plate and covers the heat source region. The second capillary region is located in the other capillary regions on the base plate excluding the first capillary region. The pore size of the first capillary region is 20~40μm, and the pore size of the second capillary region is 100μm or more. Several support columns are evenly distributed on the base plate. The base plate, support columns, and cover plate are vacuum welded to form a sealed cavity, which is filled with a liquid working fluid.

[0006] Preferably, the base plate is provided with a filling hole that passes through the sealing cavity, and the filling hole and the sealing cavity are sealed by welding.

[0007] Preferably, the outer periphery of the first capillary region extends toward the second capillary region in a radiating pattern.

[0008] Preferably, when the base plate is rectangular, the first capillary core region is also rectangular and extends from the outer periphery to the second capillary core region to form a cross-shaped structure; when the base plate is circular, the first capillary core region is also circular and extends from the outer periphery to the second capillary core region to form a radial structure.

[0009] Preferably, the bottom plate has a downwardly recessed groove on the side facing the cover plate, and the support column is disposed in the groove.

[0010] This utility model has at least the following beneficial effects:

[0011] 1. This utility model forms a composite structure by sintering two capillary cores with different pore sizes on the base plate, which can not only ensure good evaporation and vaporization effect, but also facilitate the reflux of the working fluid, and meet the requirements of high heat flux density and high power consumption.

[0012] 2. The capillary wick settings of the two different pore sizes of this utility model have a certain design range, which can achieve more optimized evaporation and reflux effects.

[0013] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0015] To better understand the purpose, structure, and function of this utility model, the following detailed description is provided in conjunction with the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0016] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] like Figure 1 As shown, this utility model provides a high-power multi-pore capillary composite structure heat spreader, including a base plate, a first capillary region 1 and a second capillary region 2 sintered on the base plate, and a cover plate 3. The first capillary region is located at the center of the base plate and covers the heat source area. The second capillary region is located in other capillary regions on the base plate except for the first capillary region. The pore size of the first capillary region is 20~40μm, and the pore size of the second capillary region is 100μm or more. Several support columns 3 are evenly distributed on the base plate. The base plate, support columns and cover plate are vacuum welded to form a sealed cavity, which is filled with liquid working fluid.

[0018] This application relates to a multi-pore capillary heat spreader, specifically designed for applications with high heat flux density (generally defined as exceeding 50 W / cm², but in this application, it can be defined as exceeding 100 W / cm²) and high power consumption (referring to the power consumption of a single heat source with a heat dissipation greater than 200 W, or the power consumption of a heat source with a heat flux density exceeding 50 W / cm²). On one hand, the capillary wick needs to have a very small pore size to provide high capillary force, which is the driving force for the entire system's operation. On the other hand, the capillary wick also needs to have high porosity to ensure good permeation. In this application, the porosity of the small-pore first capillary wick region is approximately 35%–40%, with a pore size of 20–40 μm, offering significant advantages for applications with heat flux densities higher than 100 W / cm². The porosity of the large-pore second capillary wick region is 50%–70%, with a pore size exceeding 100 μm, suitable for applications with heat flux densities below 50 W / cm².

[0019] In one embodiment of this application, a 20μm-level metal powder is sintered in the heat source area (the center of the back of the base plate is the heat source area) for a first sintering, and 100μm metal powder is used for a second sintering in other areas. This can ensure that the heat source area has good capillary force and that the capillary core in the low-temperature area has good porosity.

[0020] Small-aperture capillary wicks are primarily designed for high heat flux density heat sources, resulting in better evaporation of the liquid working fluid. However, this also leads to greater resistance when the working fluid is drawn back through the capillary wick. Large-aperture capillary wicks, on the other hand, offer less resistance when the working fluid is drawn back. This application combines both pore sizes to ensure good evaporation while facilitating working fluid reflux. By placing the small-aperture capillary wick in the center and the large-aperture capillary wick around the periphery, the working fluid can more easily flow back to the center. The large-aperture capillary wick provides a main flow path for the liquid, reducing resistance, while the small-aperture capillary wick provides capillary tension.

[0021] Aluminum powder is screened to produce powder with different pore sizes. The smaller pore size powder is used to create the first capillary core area on the base plate, and then the larger pore size powder is used to create the second capillary core area on the remaining edge of the base plate. The aluminum alloy capillary core can be sintered a second time on the original base. First, both capillary structures are sintered on the base plate. Then, the base plate, cover plate, and support columns are vacuum welded together to fix the capillary core in place on the base plate.

[0022] In another technical solution, a filling hole is provided on the base plate, which extends through the sealed cavity. The filling hole and the sealed cavity are sealed by welding. A small hole, namely the filling hole, is left on the base plate. After the base plate, cover plate, and support column are welded, liquid working fluid is filled through the small hole. After filling, the small hole is sealed, and the plate is processed into a specified flat plate shape. During high-temperature welding, the small hole is needed to allow air to escape from the sealed cavity.

[0023] In another technical solution, the outer periphery of the first capillary region extends toward the second capillary region in a radiating pattern. When the base plate is rectangular, the first capillary region is also rectangular and extends toward the second capillary region from its outer periphery to form a cross-shaped structure; when the base plate is circular, the first capillary region is also circular and extends toward the second capillary region from its outer periphery to form a radial structure.

[0024] The small-aperture capillary wick, or the first capillary wick region, is located in the center of the heat source, but also extends outwards. The small-aperture capillary wick has a stronger suction force, and its outward extension helps draw the working fluid towards the center. Relying solely on the large-aperture capillary wick, or the second capillary wick region, might result in the fluid not reaching the exact center before evaporating. For example... Figure 1 As shown, a rectangular base plate with the proportions of the two areas is an optimal design, facilitating mass production. For circular base plate products, a radial arrangement is best.

[0025] In another technical solution, the bottom plate has a downwardly recessed groove on the side facing the cover plate, and the support column is disposed within the groove. One side of the bottom plate is recessed, and the other side is flat.

[0026] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model, and other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A high-power multi-pore capillary core composite structure temperature distribution plate, characterized in that, The device includes a base plate, a first capillary core region and a second capillary core region sintered on the base plate, and a cover plate. The first capillary core region is located at the center of the base plate and covers the heat source region. The second capillary core region is located in other capillary core regions on the base plate except for the first capillary core region. The pore size of the first capillary core region is 20~40μm, and the pore size of the second capillary core region is 100μm or more. Several support columns are evenly distributed on the base plate. The base plate, support columns, and cover plate are vacuum welded to form a sealed cavity, which is filled with a liquid working fluid.

2. The high-power multi-pore capillary core composite structure heat spreader as described in claim 1, characterized in that, A filling hole is provided on the base plate, which passes through the sealing cavity, and the filling hole and the sealing cavity are sealed by welding.

3. The high-power multi-pore capillary core composite temperature distribution plate as described in claim 1, characterized in that, The outer periphery of the first capillary region extends toward the second capillary region in a scattering pattern.

4. The high-power multi-pore capillary core composite structure heat spreader as described in claim 3, characterized in that, When the base plate is rectangular, the first capillary core region is also rectangular and extends from the outer periphery to the second capillary core region to form a cross-shaped structure; when the base plate is circular, the first capillary core region is also circular and extends from the outer periphery to the second capillary core region to form a radial structure.

5. The high-power multi-pore capillary core composite temperature distribution plate as described in claim 1, characterized in that, The bottom plate has a downward recessed groove on the side facing the cover plate, and the support column is disposed in the groove.

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