A novel 3D uniform temperature plate

Abstract

The utility model discloses a novel 3D uniform temperature plate, including upper cover plate, capillary structure layer and lower cover plate subassembly, and lower cover plate subassembly is by lower cover plate and a plurality of heat pipe through the integrated forming of forging pressure, and upper cover plate and lower cover plate subassembly weld fixed, and the middle is provided with hollow chamber, and capillary structure layer is placed in the hollow chamber, and the side surface of upper cover plate towards hollow chamber is provided with upper convex column array, and the side surface of lower cover plate subassembly towards hollow chamber is provided with lower convex column array, and the outer side of heat pipe of lower cover plate subassembly is installed with the reinforced support plate, and lower cover plate and heat pipe integrated molding have dispensed with the cumbersome step of punching on copper plate and then welding heat pipe to copper plate in the manufacture of traditional uniform temperature plate, and the workload when a plurality of heat pipe trepanning welds is reduced, and the welding seam when a plurality of holes welds of integrated molding lower cover plate subassembly also greatly reduces, and the manufacturing efficiency and precision are improved.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology, and in particular to a novel 3D heat dissipation plate. Background Technology

[0002] A 3D vapor chamber is a highly efficient two-phase flow passive heat dissipation device. Its core function is to achieve rapid diffusion and uniform distribution of heat in three-dimensional space, significantly reducing the temperature of local hot spots and improving the overall efficiency of the heat dissipation system. Most vapor chambers on the market are made by first punching an array of holes on the surface of the upper or lower cover plate, and then welding multiple heat pipes to the upper or lower cover plate. For example, Chinese Patent Publication No. CN 221306378 U, published on July 9, 2024, entitled "A 3D Vapor Chamber", shows that the upper cover plate in this patent is made by first punching an array of holes and then welding multiple heat pipes to the upper cover plate. Poor welding process can easily lead to weld seams, weakening the effective load-bearing area at the weld, affecting the sealing performance of the 3D vapor chamber, and reducing the quality of the finished 3D vapor chamber. Utility Model Content

[0003] The purpose of this invention is to provide a novel 3D heat spreader to solve the above-mentioned problems.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A novel 3D heat spreader includes an upper cover plate, a capillary structure layer, and a lower cover plate assembly. The upper cover plate and the lower cover plate assembly are welded and fixed together, with a hollow cavity in the middle. The capillary structure layer is arranged inside the hollow cavity. The lower cover plate assembly is an integrally formed workpiece of the lower cover plate and heat pipe through a forging process.

[0006] Furthermore, a capillary surface is sintered on the surface of the lower cover plate assembly.

[0007] Furthermore, an array of upward-protruding pillars is provided on the side surface of the upper cover plate facing the hollow cavity.

[0008] Furthermore, the lower cover plate assembly has an array of downward protruding pillars on the side surface facing the hollow cavity.

[0009] Furthermore, a reinforcing support plate is installed on the outside of the heat pipe.

[0010] Furthermore, a hollow inner hole is provided inside the heat pipe, and the hollow inner hole communicates with the hollow cavity.

[0011] Furthermore, the novel 3D heat spreader can be manufactured using the following method:

[0012] Step 1: Prepare the materials for the lower cover plate and heat pipe, and form the blank of the workpiece into an integral part through forging process;

[0013] Step 2: The blank from Step 1 is machined to form a hollow inner hole with a diameter of 6.5-7.4 mm and a depth of 32.5-34.7 mm on the inner side of the heat pipe on the blank. The hollow inner hole is connected to the lower cover plate.

[0014] Step 3: Clean the preform obtained in Step 2 using an ultrasonic cleaner;

[0015] Step 4: After applying powder to the interior of the preform cleaned in Step 3 using one of the following methods: spraying, printing, or screen printing, sinter it using a bell-type gas furnace or a continuous mesh belt sintering furnace to form a capillary surface.

[0016] Step 5: Place the capillary layer on top of the lower cover plate assembly, align the edges of the upper cover plate and the lower cover plate assembly, and weld them together to obtain the finished workpiece;

[0017] Step Six: A 1-2mm injection hole is machined on the top of the finished workpiece obtained in Step Five. After vacuuming the hollow cavity through the injection hole, one of the following working liquids is injected: water, acetone, ammonia, or gallium-based alloy. After the injection is completed, the injection hole is immediately cold-welded or flattened and sealed to form a new type of 3D heat spreader.

[0018] The beneficial effects of this utility model are:

[0019] The lower cover plate assembly is formed by forging the lower cover plate and multiple heat pipes into one piece, which reduces the time required for welding the upper cover plate or lower cover plate to multiple heat pipes in the traditional manufacturing process. The integrated structure improves the tensile strength, yield strength and impact toughness at the connection between the lower cover plate and the heat pipes. Compared with the traditional manufacturing process, it reduces welds and extends service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the split structure of this utility model;

[0022] Figure 3 This is a cross-sectional view of the split structure of this utility model;

[0023] Figure 4 for Figure 3 An enlarged structural diagram at point A;

[0024] Figure 5 This is an exploded view of the lower cover plate assembly of this utility model.

[0025] The components are: 1. Top cover plate; 2. Capillary structure layer; 3. Bottom cover plate assembly; 11. Upper convex column array; 31. Bottom cover plate; 32. Heat pipe; 311. Bottom convex column array; 33. Reinforcing connecting plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-5 As shown, this utility model discloses a novel 3D heat spreader and its manufacturing method. The novel 3D heat spreader includes an upper cover plate 1, a capillary structure layer 2, and a lower cover plate assembly 3. The upper cover plate 1 and the lower cover plate assembly 3 are welded and fixed together. A hollow cavity is provided in the middle, and the capillary structure layer 2 is provided in the hollow cavity. The upper cover plate 1 and the lower cover plate assembly 3 are welded and fixed together. The lower cover plate assembly 3 is an integrally formed workpiece of the lower cover plate 31 and the heat pipe 32 through a forging process.

[0029] The surface of the lower cover plate assembly 3 is sintered with a capillary surface.

[0030] The upper cover plate 1 has an array of upper protruding columns 11 on the side surface facing the hollow cavity.

[0031] The lower cover plate assembly 3 has a lower protruding column array 311 on the side surface facing the hollow cavity.

[0032] The lower cover assembly 3 is equipped with a reinforcing support plate 33 located on the outside of the heat pipe 32.

[0033] The heat pipe 32 has a hollow inner hole that is connected to the hollow cavity.

[0034] The integrated workpiece formed by forging the lower cover plate 31 and the heat pipe 32 needs to be machined to make the hollow inner hole formed by the heat pipe 32 on this workpiece connected to the hollow cavity. The debris generated during the machining of the hole is cleaned by an ultrasonic cleaner. After cleaning, the inside of the workpiece is coated with powder by one of the following methods: spraying, printing, or screen printing. Then, the capillary surface is sintered using a bell-type gas furnace or a continuous mesh belt sintering furnace. Sintering the capillary surface enables the hole wall formed by drilling to have a strong capillary suction force, which enhances the heat transfer function.

[0035] A capillary structure layer 3 is placed between the upper cover plate 1 and the lower cover plate assembly 3 with the sintered capillary surface, and the edges are welded and fixed.

[0036] A liquid injection hole is machined on the top of the finished workpiece after welding. One of the following working liquids is injected: water, acetone, ammonia, or gallium-based alloy. A vacuum must be drawn before injection. After injection, the injection hole is immediately cold-welded or flattened and sealed. The sealing must be done under vacuum conditions to prevent air from seeping in.

[0037] In practical use, the flat side of the upper cover plate 1 is responsible for absorbing the heat generated by the heat chip. The heat is rapidly conducted through the internal medium of this new type of 3D heat spreader to the end where the lower cover plate 31 and heat pipe 32 are connected, hereinafter referred to as the evaporation end, and the liquid medium in the capillary layer 2 that is closely attached to the lower cover plate 31. The liquid medium evaporates and absorbs heat inside the upper cover plate 1, capillary layer 2 and lower cover plate assembly 3, turning into steam. At the same time, the medium inside the heat pipe 32 also evaporates at the evaporation end. The steam is then transported by the upper cover plate 1, lower cover plate assembly 3 and capillary layer 2. The vapor rapidly diffuses within the sealed pore space, filling the entire cavity. The vapor inside the heat pipe 32 flows towards the end of the heat pipe 32 away from the lower cover plate 31, which is referred to below as the condensation end. When the vapor comes into contact with the inner surface of the lower cover plate 1, it condenses into a liquid. The condensed liquid working fluid is actively drawn back to the lower cover plate 31 through the small channels formed by the capillary structure layer 2 under the strong capillary pumping force. The medium inside the heat pipe 32 also flows back to the evaporation end through the capillary structure of its pipe wall, forming a highly efficient passive heat transfer cycle.

[0038] The method for manufacturing the heat spreader in this embodiment includes the following steps:

[0039] Step 1: Prepare the materials for the lower cover plate 31 and the heat pipe 32, and form the blank of the integral workpiece through the forging process;

[0040] Step 2: The blank from Step 1 is machined to form a hollow inner hole with a diameter of 6.5-7.4 mm and a depth of 32.5-34.7 mm on the inner side of the heat pipe 32 on the blank. The hollow inner hole is connected to the lower cover plate.

[0041] Step 3: Clean the preform obtained in Step 2 using an ultrasonic cleaner;

[0042] Step 4: After applying powder to the interior of the preform cleaned in Step 3 using one of the following methods: spraying, printing, or screen printing, sinter it using a bell-type gas furnace or a continuous mesh belt sintering furnace to form a capillary surface.

[0043] Step 5: Place the capillary layer 2 on the upper side of the lower cover plate assembly 3, align the edges of the upper cover plate 1 and the lower cover plate assembly 3, and weld them together to obtain the finished workpiece;

[0044] Step Six: A 1-2mm injection hole is machined on the top of the finished workpiece obtained in Step Five. After vacuuming the hollow cavity through the injection hole, one of the following working liquids is injected: water, acetone, ammonia, or gallium-based alloy. After the injection is completed, the injection hole is immediately cold-welded or flattened and sealed to form a new type of 3D heat spreader.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel 3D heat spreader, comprising an upper cover plate (1), a capillary structure layer (2), and a lower cover plate assembly (3), characterized in that, The upper cover plate (1) and the lower cover plate assembly (3) are welded and fixed together. A hollow cavity is provided in the middle, and a capillary structure layer (2) is provided in the hollow cavity. The lower cover plate assembly (3) is an integrally formed workpiece formed by the lower cover plate (31) and the heat pipe (32) through a forging process.

2. The novel 3D heat spreader according to claim 1, characterized in that, The lower cover plate assembly (3) has a capillary surface sintered on its surface.

3. The novel 3D heat spreader according to claim 1, characterized in that, The upper cover plate (1) has an array of upper protruding columns (11) on the side surface facing the hollow cavity.

4. The novel 3D heat spreader according to claim 1, characterized in that, The lower cover plate assembly (3) has a lower convex column array (311) on the side surface facing the hollow cavity.

5. The novel 3D heat spreader according to claim 1, characterized in that, The lower cover plate assembly (3) is equipped with a reinforcing support plate (33) on the outside of the heat pipe (32).

6. The novel 3D heat spreader according to claim 1, characterized in that, The heat pipe (32) has a hollow inner hole, which is connected to the hollow cavity.

Images