Manufacturing method of high-efficiency composite capillary temperature-uniforming plate and high-efficiency composite capillary temperature-uniforming plate

Abstract

The invention relates to the technical field of composite VC temperature-uniforming plates, and discloses a manufacturing method of an efficient composite capillary temperature-uniforming plate and the efficient composite capillary temperature-uniforming plate, and the manufacturing method comprises the following steps: (1) prefabricating a copper mesh layer, a powder mesh layer and a copper powder layer; (2) capillary manufacturing of an upper cover: cutting and punching a copper mesh layer, sintering the copper mesh layer and the upper cover piece, and performing diffusion welding operation; the powder net layer and the copper powder layer are stacked to form a lower capillary layer, the lower capillary layer is cut and punched, and the lower capillary layer and the lower cover piece are sintered and subjected to diffusion welding operation; (3) copper column assemblies are placed; and (4) the upper cover piece and the lower cover piece are welded and fixed through diffusion welding. The capillary manufacturing process and steps of the upper cover piece and the lower cover piece are simplified, the using number of net burning molds is reduced, the production efficiency is improved, the copper net layer, the copper column assembly and the powder net layer are matched, working medium backflow is facilitated, meanwhile, the capillary mesh number is prevented from being limited, working medium backflow is effectively promoted, working medium evaporation is accelerated, and the heat dissipation effect and heat dissipation efficiency of the vapor chamber are further improved.

Description

Technical Field

[0001] This invention patent relates to the technical field of composite VC heat pipes. Specifically, it relates to a manufacturing method for an efficient composite capillary heat pipe and an efficient composite capillary heat pipe. Background Art

[0002] A heat pipe operates based on the evaporation and condensation cycle of the working fluid enclosed in a plate-shaped cavity, enabling it to have the characteristic of rapid temperature equalization, and thus having the functions of rapid heat conduction and heat diffusion. When the heat pipe is working, the working liquid in the heated area evaporates when heated, diffuses to the condensation area and then condenses into a liquid state, and then drips back to the evaporation area by gravity and is adsorbed by the capillary structure, and this cycle realizes heat conduction and heat diffusion.

[0003] Currently, in order to improve the reflux effect and reflux efficiency of the working liquid, heat pipes are provided with capillary structures to improve the reflux effect and reflux efficiency of the working fluid. For example, a prior patent with the application publication number CN116164568A discloses a copper-aluminum composite structure heat pipe, which includes a capillary core (2) made of copper. Copper-aluminum composite covers (1) are provided on both the upper and lower sides of the capillary core (2). The copper layers (11) of the two copper-aluminum composite covers (1) are both located on the inner side, and the aluminum layers (12) are both located on the outer side. The peripheries of the two copper-aluminum composite covers (1) are connected and sealed by a sealing structure (4) to form a sealed cavity (3), and a heat transfer working fluid is provided in the sealed cavity (3).

[0004] In the prior art, both the heat absorption of the heat pipe and the reflux efficiency of the working fluid are insufficient, resulting in poor efficiency of the vapor-liquid cycle and affecting the heat dissipation effect of the heat pipe. Summary of the Invention

[0005] The purpose of the present invention is to provide a manufacturing method for an efficient composite capillary heat pipe and an efficient composite capillary heat pipe, aiming to solve the problem in the prior art that the working fluid reflux efficiency of the heat pipe is poor and affects the heat dissipation effect.

[0006] The present invention is implemented as follows. The manufacturing method for an efficient composite capillary heat pipe includes an upper cover plate, a lower cover plate, and a copper column assembly. The specific manufacturing steps are as follows: (1) Pre-fabricate a copper mesh layer, a powder mesh layer, and a copper powder layer; (2) Upper cover capillary production: Cut and punch the copper mesh layer to form upper layer holes, then perform spot welding on the copper mesh layer and the upper cover part, and then perform sintering and diffusion welding on the copper mesh layer and the upper cover part; Lower cover capillary production: Stack the powder mesh layer and the copper powder layer to form a lower capillary layer. Cut and punch the lower capillary layer to form lower layer holes. Perform spot welding on the lower capillary layer and the lower cover part, and then perform sintering and diffusion welding on the lower capillary layer and the lower cover part; (3) Place the copper column assembly, with both ends of the copper column assembly passing through the upper layer hole and the lower layer hole respectively. Both ends of the copper column assembly are in contact with the upper cover and the lower cover, and the copper column assembly is in capillary communication with the copper mesh layer and the powder mesh layer respectively; (4) Use diffusion welding to weld and fix the upper cover and the lower cover.

[0007] Further, the copper mesh layer, the powder mesh layer, and the copper powder layer formed in step (1) are each arranged in a thin sheet shape.

[0008] Further, it includes graphite for burning the mesh, and the graphite for burning the mesh is used for the sintering operation in step (2).

[0009] Further, the copper column assembly includes a plurality of large-diameter columns, and the large-diameter columns are arranged at intervals correspondingly. The upper part of the large-diameter column passes through the upper layer hole and extends to be in contact with the upper cover plate, and the lower part of the large-diameter column synchronously passes through the lower layer hole and extends to be in contact with the lower cover plate; the large-diameter columns are in capillary communication with the copper mesh layer, the powder mesh layer, and the copper powder layer respectively.

[0010] Further, the large-diameter column includes a large powder column and a large copper column, the large copper column and the large powder column are arranged in a sleeved manner, and the large powder column is inside the large copper column. The large copper column is used to support the upper cover, and both ends of the large powder column are in capillary communication with the copper mesh layer, the powder mesh layer, and the copper powder layer respectively.

[0011] Further, the copper column assembly includes a plurality of small-diameter columns, the diameter value of the small-diameter column is smaller than that of the large-diameter column. The lower cover plate includes a heat conduction part and two side heat parts. Both ends of the heat conduction part are in butt joint and integrally formed with the two side heat parts. The heat conduction part is used for heat exchange with a heat source. The small-diameter column passes through the powder mesh layer and extends to be in contact with the side heat part; the small-diameter column includes a small powder column and a small copper column, the small copper column and the small powder column are arranged in a sleeved manner, and the small powder column is inside the small copper column. Both ends of the small powder column are in capillary communication with the copper mesh layer and the powder mesh layer respectively.

[0012] The high-efficiency composite capillary heat spreader includes an upper cover plate, a copper mesh layer, a copper column assembly, a powder mesh layer, and a lower cover plate. The upper cover plate and the lower cover plate are welded to form a plate cavity. The copper mesh layer, the copper column assembly, and the powder mesh layer are respectively located in the plate cavity. The copper mesh layer is arranged in a flat manner on the upper cover plate, the powder mesh layer is arranged in a flat manner on the lower cover plate. Both ends of the copper column assembly are in butt joint with the upper cover plate and the lower cover plate respectively, and the copper column assembly is in capillary communication with the copper mesh layer and the powder mesh layer synchronously.

[0013] Further, the lower cover plate includes a heat conduction part for heat exchange with a heat source, and the heat conduction part is convexly arranged in a direction away from the upper cover plate; the high-efficiency composite capillary heat pipe includes a copper powder layer, and the powder mesh layer, the copper layer and the heat conduction part are arranged in a stacked manner in sequence.

[0014] Further, longitudinal sections are respectively formed at two ends of the powder mesh layer, and the longitudinal sections are in capillary communication with the copper mesh layer.

[0015] Further, the copper mesh layer, the powder mesh layer and the copper powder layer are respectively arranged in a thin sheet shape.

[0016] Compared with the prior art, the manufacturing method of the high-efficiency composite capillary heat pipe and the high-efficiency composite capillary heat pipe provided by the present invention simplify the capillary manufacturing processes and steps of the upper cover part and the lower cover part, which helps to reduce the number of used sintering molds and improve the production efficiency. At the same time, under the combined action of the copper mesh layer, the copper column assembly and the powder mesh layer, the working medium is facilitated to flow back, thereby accelerating the efficiency of the working medium absorbing heat and ensuring the heat dissipation effect of the heat pipe. Moreover, by using the upper and lower cooperation of the copper mesh layer and the powder mesh layer, the limitation of capillary fineness is avoided, effectively promoting the flow back of the working medium and accelerating the evaporation of the working medium, further improving the heat dissipation effect and heat dissipation efficiency of the heat pipe. Description of the Drawings

[0017] Figure 1 is a schematic manufacturing process diagram of the manufacturing method of the high-efficiency composite capillary heat pipe provided by the present invention; Figure 2 is a schematic cross-sectional view of the high-efficiency composite capillary heat pipe provided by the present invention; Figure 3 is a schematic cooperation diagram of the high-efficiency composite capillary heat pipe provided by the present invention and a fin module; Figure 4 is an enlarged schematic view of part A of the high-efficiency composite capillary heat pipe provided by the present invention; Figure 5 is an enlarged schematic view of part B of the high-efficiency composite capillary heat pipe provided by the present invention. Detailed Embodiments

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

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

[0020] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] Referring to Figures 1-5 shown, it is a preferred embodiment provided by the present invention.

[0022] A manufacturing method of an efficient composite capillary heat pipe includes an upper cover plate 1, a lower cover plate 5 and a copper column assembly 3. The specific manufacturing steps are as follows: (1) Pre-fabricate a copper mesh layer 2, a powder mesh layer 4 and a copper powder layer 6; Upper cover capillary manufacturing: Cut and punch the copper mesh layer 2 to form upper layer holes, then perform spot welding on the copper mesh layer 2 and the upper cover part, and then perform sintering and diffusion welding on the copper mesh layer 2 and the upper cover part; Lower cover capillary manufacturing: Stack the powder mesh layer 4 and the copper powder layer 6 to form a lower capillary layer, cut and punch the lower capillary layer to form lower layer holes, perform spot welding on the lower capillary layer and the lower cover part, and then perform sintering and diffusion welding on the lower capillary layer and the lower cover part; (3) Place the copper column assembly 3. The two ends of the copper column assembly 3 respectively penetrate through the upper layer holes and the lower layer holes. The two ends of the copper column assembly 3 are in contact with the upper cover part and the lower cover part, and the copper column assembly 3 is in capillary communication with the copper mesh layer 2 and the powder mesh layer 4 respectively; (4) Use diffusion welding to weld and fix the upper cover part and the lower cover part.

[0023] The above-mentioned manufacturing method of the efficient composite capillary heat pipe simplifies the capillary manufacturing process and steps of the upper cover part and the lower cover part, helps to reduce the number of burning net molds used, improves production efficiency. At the same time, under the combined action of the copper mesh layer 2, the copper column assembly 3 and the powder mesh layer 4, it is convenient for the working medium to flow back, thereby accelerating the efficiency of the working medium absorbing heat, ensuring the heat dissipation effect of the heat pipe. Moreover, by using the upper and lower cooperation of the copper mesh layer 2 and the powder mesh layer 4, the limitation of capillary fineness is avoided, effectively promoting the backflow of the working medium and accelerating the evaporation of the working medium, further improving the heat dissipation effect and heat dissipation efficiency of the heat pipe.

[0024] After step (4), the following operations are sequentially performed: trimming, welding the degassing pipe, reduction, water injection, first removal, second removal, shaping, testing, pressure welding, cutting the head, electroplating, helium detection, water bath.

[0025] The copper mesh layer 2, powder mesh layer 4, and copper powder layer 6 formed in step (1) are respectively arranged in a flaky shape; in this way, it is convenient for the assembly between the copper mesh layer 2 and the upper cover member, and it is also convenient for the assembly between the powder mesh layer 4 and the copper powder layer 6 and the lower cover member; thus, it is convenient for the capillary production of the heat pipe.

[0026] The copper mesh layer 2 is formed by sintering copper through a sintered mesh graphite, the powder mesh layer 4 is formed by sintering copper powder through a sintered mesh graphite, and the copper powder layer 6 is formed by sintering copper powder through a sintered mesh graphite.

[0027] It includes sintered mesh graphite, and the sintered mesh graphite is used for the sintering operation in step (2).

[0028] The copper column assembly 3 includes a plurality of large-diameter columns 31. Each large-diameter column 31 is arranged at intervals correspondingly. The upper part of the large-diameter column 31 penetrates through the upper layer hole and extends to be in contact with the upper cover plate 1, and the lower part of the large-diameter column 31 synchronously penetrates through the lower layer hole and extends to be in contact with the lower cover plate 5; the large-diameter columns 31 are respectively arranged in capillary communication with the copper mesh layer 2, the powder mesh layer 4, and the copper powder layer 6.

[0029] Under the combined action of each large-diameter column 31, it has sufficient supporting force, improves the bearing capacity of the heat pipe and improves the service life of the heat pipe.

[0030] Furthermore, using the large-diameter columns 31 can reduce the number of large-diameter columns 31 arranged, reduce costs, and at the same time, contribute to improving the production efficiency of the heat pipe.

[0031] The large-diameter column 31 includes a large powder column 312 and a large copper column 311. The large copper column 311 and the large powder column 312 are arranged in a sleeved manner, and the large powder column 312 is inside the large copper column 311. The large copper column 311 is used to support the upper cover member, and both ends of the large powder column 312 are respectively arranged in capillary communication with the copper mesh layer 2, the powder mesh layer 4, and the copper powder layer 6; in this way, the large copper column 311 plays a supporting role, and the large powder column 312 realizes the return of the working medium, which not only effectively guarantees the supporting effect, but also helps to improve the return efficiency and return effect of the working medium.

[0032] The copper column assembly 3 includes a plurality of small-diameter columns 32. The diameter value of the small-diameter column 32 is smaller than that of the large-diameter column 31. The lower cover plate 5 includes a heat conduction part and two side heat conduction parts. Both ends of the heat conduction part are respectively in butt joint and integrally formed with the two side heat conduction parts. The heat conduction part is used for heat exchange with the heat source. The small-diameter column 32 penetrates through the powder mesh layer 4 and extends to be in contact with the side heat conduction part; Under the combined action of each small-diameter column 32, it has sufficient supporting force and realizes the return of the working medium at the same time, improves the bearing capacity of the heat pipe and improves the service life of the heat pipe.

[0033] The small-diameter column 32 includes a small pink column 322 and a small copper column 321. The small copper column 321 and the small pink column 322 are arranged in a nested manner, and the small pink column 322 is inside the small copper column 321. The two ends of the small pink column 322 are respectively in capillary connection with the copper mesh layer 2 and the powder mesh layer 4.

[0034] In this way, the small copper column 321 plays a supporting role, and the small pink column 322 realizes the return of the working medium, not only effectively ensuring the supporting effect, but also helping to improve the return efficiency and return effect of the working medium.

[0035] The high-efficiency composite capillary heat spreader includes an upper cover plate 1, a copper mesh layer 2, a copper column assembly 3, a powder mesh layer 4, and a lower cover plate 5. The upper cover plate 1 and the lower cover plate 5 are welded to form a plate cavity. The copper mesh layer 2, the copper column assembly 3, and the powder mesh layer 4 are respectively located in the plate cavity. The copper mesh layer 2 is arranged flat on the upper cover plate 1, the powder mesh layer 4 is arranged flat on the lower cover plate 5. The two ends of the copper column assembly 3 are respectively in butt joint with the upper cover plate 1 and the lower cover plate 5, and the copper column assembly 3 is synchronously in capillary connection with the copper mesh layer 2 and the powder mesh layer 4.

[0036] In the above-mentioned high-efficiency composite capillary heat spreader, under the combined action of the copper mesh layer 2, the copper column assembly 3, and the powder mesh layer 4, it is convenient for the working medium to return, thereby accelerating the efficiency of the working medium absorbing heat and ensuring the heat dissipation effect of the heat spreader. At the same time, the upper and lower cooperation of the copper mesh layer 2 and the powder mesh layer 4 is adopted to avoid the limitation of the capillary fineness, effectively promoting the return of the working medium and accelerating the evaporation of the working medium, further improving the heat dissipation effect and heat dissipation efficiency of the heat spreader.

[0037] The lower cover plate 5 includes a heat conduction part, and the heat conduction part is used for heat exchange with the heat source. The heat conduction part is convexly arranged in the direction away from the upper cover plate 1; in this way, through the contact or indirect contact between the heat conduction part and the heat source, the conduction of heat is realized.

[0038] The heat conduction part is arranged below. In this way, under the capillary action and the gravity action of the working medium, it is convenient for the working medium to return to the heat conduction part, accelerating the efficiency of the working medium absorbing heat.

[0039] The high-efficiency composite capillary heat spreader includes a copper powder layer 6. The powder mesh layer 4, the copper powder layer 6, and the heat conduction part are arranged in sequential superposition; under the combined action of the copper powder layer 6 and the powder mesh layer 4, the return of the working medium is accelerated, thereby accelerating the efficiency of the working medium absorbing heat and improving the heat dissipation effect and heat dissipation efficiency of the heat spreader.

[0040] The copper powder layer 6 and the powder mesh layer 4 are arranged in a flat superposition manner, and the copper powder layer 6 and the powder mesh layer 4 are in capillary connection; the cooperation effect of the copper powder layer 6 and the powder mesh layer 4 is improved, thereby facilitating the return of the working medium and accelerating the evaporation of the working medium, improving the heat dissipation effect.

[0041] The upper cover plate 1 and the lower cover plate 5 are arranged in a welded manner, and the welding assembly of the upper cover plate 1 and the lower cover plate 5 can be realized by diffusion welding.

[0042] The upper part of the copper column assembly 3 penetrates through the copper mesh layer 2 and extends to be arranged in butt joint with the upper cover plate 1, and the lower part of the copper column assembly 3 synchronously penetrates through the powder mesh layer 4 and the copper powder layer 6 and extends to be arranged in butt joint with the lower cover plate 5; in this way, the copper column assembly 3 plays a role in supporting and strengthening, improving the stability of the upper cover plate 1 and the lower cover plate 5. At the same time, the copper column assembly 3 plays a role in guiding the flow, increasing the return path of the working medium, and improving the return efficiency and return effect of the working medium.

[0043] The copper column assembly 3 includes a plurality of large-diameter columns 31, and the large-diameter columns 31 are arranged at intervals correspondingly. The upper part of the large-diameter column 31 penetrates through the copper mesh layer 2 and extends to be arranged in butt joint with the upper cover plate 1, and the lower part of the large-diameter column 31 synchronously penetrates through the powder mesh layer 4 and the copper powder layer 6 and extends to be arranged in butt joint with the lower cover plate 5.

[0044] Under the combined action of the large-diameter columns 31, there is sufficient supporting force, improving the bearing capacity of the heat pipe and the service life of the heat pipe.

[0045] Furthermore, using the large-diameter columns 31 can reduce the number of large-diameter columns 31 arranged, reduce costs, and at the same time, contribute to improving the production efficiency of the heat pipe.

[0046] The large-diameter column 31 includes a large powder column 312 and a large copper column 311. The large copper column 311 and the large powder column 312 are arranged in a sleeved manner, and the large powder column 312 is inside the large copper column 311. The two ends of the large powder column 312 are arranged in capillary connection with the copper mesh layer 2, the powder mesh layer 4, and the copper powder layer 6 respectively; in this way, the large copper column 311 plays a supporting role, and the large powder column 312 realizes the return of the working medium, not only effectively ensuring the supporting effect, but also contributing to improving the return efficiency and return effect of the working medium.

[0047] The copper column assembly 3 includes a plurality of small-diameter columns 32. The diameter value of the small-diameter column 32 is smaller than that of the large-diameter column 31. The lower cover plate 5 includes two side heat-conducting parts. The two ends of the heat-conducting part are arranged in butt joint and integrally formed with the two side heat-conducting parts respectively. The small-diameter column 32 penetrates through the powder mesh layer 4 and extends to be arranged in butt joint with the side heat-conducting part.

[0048] Under the combined action of the small-diameter columns 32, there is sufficient supporting force and the return of the working medium is realized, improving the bearing capacity of the heat pipe and the service life of the heat pipe.

[0049] The small-diameter column 32 includes a small powder column 322 and a small copper column 321. The small copper column 321 and the small powder column 322 are arranged in a sleeved manner, and the small powder column 322 is inside the small copper column 321. The two ends of the small powder column 322 are arranged in capillary connection with the copper mesh layer 2 and the powder mesh layer 4 respectively; in this way, the small copper column 321 plays a supporting role, and the small powder column 322 realizes the return of the working medium, not only effectively ensuring the supporting effect, but also contributing to improving the return efficiency and return effect of the working medium.

[0050] Meanwhile, the small-diameter column 32 is located in the side heat part, and the space height of the side heat part is less than that of the heat conduction part. Using the small-diameter column 32 has sufficient supporting force and effectively reduces the cost of the heat pipe.

[0051] Longitudinal sections are respectively formed at both ends of the powder mesh layer 4, and the longitudinal sections are arranged in capillary connection with the copper mesh layer 2; the capillary cooperation between the powder mesh layer 4 and the copper mesh layer 2 is improved, enabling the working medium to flow back through different paths, and improving the flow-back effect and flow-back efficiency of the working medium.

[0052] The longitudinal sections are arranged obliquely, and the advantage of this setting is that it facilitates the flow-back of the working medium.

[0053] The upper cover plate 1 and the fin module 7 are assembled, and the fin module 7 helps to dissipate heat, facilitating the cooling of the gaseous working medium into a liquid working medium, thereby improving the flow-back efficiency of the working medium.

[0054] The copper mesh layer 2, the powder mesh layer 4 and the copper powder layer 6 are respectively arranged in thin sheet form; in this way, it is convenient for the assembly between the copper mesh layer 2 and the upper cover part 1, and also convenient for the assembly between the powder mesh layer 4 and the copper powder layer 6 and the lower cover part 5; thus facilitating the production and manufacturing of the heat pipe.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A manufacturing method of a high-efficiency composite capillary heat spreader, characterized in that, It includes an upper cover plate, a lower cover plate and a copper column assembly. The specific manufacturing steps are as follows: (1) Pre-fabricate a copper mesh layer, a powder mesh layer and a copper powder layer; (2) Upper cover capillary production: Cut and punch the copper mesh layer to form upper holes, then perform spot welding on the copper mesh layer and the upper cover part, and then perform sintering and diffusion welding on the copper mesh layer and the upper cover part; Lower cover capillary production: Stack the powder mesh layer and the copper powder layer to form a lower capillary layer, cut and punch the lower capillary layer to form lower holes, perform spot welding on the lower capillary layer and the lower cover part, and then perform sintering and diffusion welding on the lower capillary layer and the lower cover part; (3) Place the copper column assembly. The two ends of the copper column assembly respectively penetrate the upper holes and the lower holes. The two ends of the copper column assembly are in contact with the upper cover part and the lower cover part, and the copper column assembly is in capillary communication with the copper mesh layer and the powder mesh layer respectively; (4) Use diffusion welding to weld and fix the upper cover part and the lower cover part.

2. The manufacturing method of the high-efficiency composite capillary heat spreader according to claim 1, wherein The copper mesh layer, the powder mesh layer and the copper powder layer made in step (1) are respectively arranged in a thin sheet shape.

3. The manufacturing method of the high-efficiency composite capillary heat spreader according to claim 1, characterized in that, It includes sintered mesh graphite, and the sintered mesh graphite is used for the sintering operation in step (2).

4. The manufacturing method of the high-efficiency composite capillary heat spreader according to any one of claims 1-3, characterized in that, The copper column assembly includes a plurality of large-diameter columns. Each large-diameter column is arranged at intervals correspondingly. The upper part of the large-diameter column penetrates the upper hole and extends to be in contact with the upper cover plate. The lower part of the large-diameter column synchronously penetrates the lower hole and extends to be in contact with the lower cover plate; the large-diameter column is in capillary communication with the copper mesh layer, the powder mesh layer and the copper powder layer respectively.

5. The manufacturing method of the high-efficiency composite capillary heat spreader according to claim 4, wherein The large-diameter column includes a large powder column and a large copper column. The large copper column and the large powder column are arranged in a sleeved manner, and the large powder column is inside the large copper column. The large copper column is used to support the upper cover part. The two ends of the large powder column are in capillary communication with the copper mesh layer, the powder mesh layer and the copper powder layer respectively.

6. The manufacturing method of the high-efficiency composite capillary heat spreader according to claim 5, wherein The copper column assembly includes a plurality of small-diameter columns. The diameter value of the small-diameter column is smaller than that of the large-diameter column. The lower cover plate includes a heat conduction part and two side heat parts. The two ends of the heat conduction part are respectively in butt joint and integrally formed with the two side heat parts. The heat conduction part is used for heat exchange with a heat source. The small-diameter column penetrates the powder mesh layer and extends to be in contact with the side heat part; the small-diameter column includes a small powder column and a small copper column. The small copper column and the small powder column are arranged in a sleeved manner, and the small powder column is inside the small copper column. The two ends of the small powder column are in capillary communication with the copper mesh layer and the powder mesh layer respectively.

7. High-efficiency composite heat pipe, characterized in that, It includes an upper cover plate, a copper mesh layer, a copper column assembly, a powder mesh layer and a lower cover plate. The upper cover plate and the lower cover plate are welded to form a plate cavity. The copper mesh layer, the copper column assembly and the powder mesh layer are respectively in the plate cavity. The copper mesh layer is arranged flat on the upper cover plate. The powder mesh layer is arranged flat on the lower cover plate. The two ends of the copper column assembly are respectively in butt joint with the upper cover plate and the lower cover plate, and the copper column assembly is in capillary communication with the copper mesh layer and the powder mesh layer synchronously.

8. The high-efficiency composite heat pipe according to claim 7, wherein, The lower cover plate includes a heat conduction part which is used for heat exchange with a heat source, and the heat conduction part is arranged in a convex shape in a direction away from the upper cover plate; the high-efficiency composite capillary heat spreader includes a copper powder layer, and the powder mesh layer, the copper layer and the heat conduction part are arranged in a stacked manner in sequence.

9. The high-efficiency composite capillary heat spreader according to any one of claims 1-8, characterized in that Longitudinal segments are respectively formed at two ends of the powder mesh layer, and the longitudinal segments are arranged in capillary communication with the copper mesh layer.

10. The high-efficiency composite capillary heat spreader according to any one of claims 1-8, characterized in that, The copper mesh layer, the powder mesh layer and the copper powder layer are respectively arranged in a thin sheet shape.

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