3D uniform temperature plate

Abstract

This utility model discloses a 3D heat spreader, which includes a lower cover plate, an upper cover plate, and several copper tubes. The upper cover plate is placed on top of the lower cover plate to form a steam chamber. The copper tubes are installed on the upper cover plate and pass through it, communicating with the steam chamber. The steam chamber is filled with a working fluid. Several support columns for supporting the lower and upper cover plates are provided within the steam chamber. Supporting components for supporting the copper tubes are provided on the lower cover plate. This utility model increases the capillary return water volume while also providing support for the upper copper tubes. It has a simple structure, high heat dissipation efficiency, simple manufacturing process, and low cost.

Description

Technical Field

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

[0002] As server computing power increases, the heat flux density of server CPUs also increases, making traditional vapor chambers and heat pipes insufficient for heat dissipation. Compared to traditional vapor chambers, 3D vapor chambers transform heat dissipation from a two-dimensional surface to a three-dimensional heat conduction system, significantly improving the heat dissipation capabilities of electronic components.

[0003] Currently, there are two main production processes for 3D heat spreaders on the market: one is diffusion welding molding process, and the other is tube brazing molding process. For larger VCs, the former has too high production costs and is difficult to achieve mass production. The latter process is more suitable for mass production, but under high power operation, due to internal structural design issues, the heat transfer efficiency of the latter has obvious bottlenecks, performance cannot be stable, and the production yield is not high. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is to provide a 3D heat exchange plate to improve heat transfer efficiency.

[0005] To solve the above-mentioned technical problems, this utility model provides a 3D heat spreader, including a lower cover plate, an upper cover plate, and several copper tubes. The upper cover plate covers the lower cover plate to form a steam chamber. The copper tubes are installed on the upper cover plate and pass through the upper cover plate to communicate with the steam chamber. The steam chamber is filled with a working fluid. Several support columns for supporting the lower cover plate and the upper cover plate are provided in the steam chamber. Support members for supporting the copper tubes are provided on the lower cover plate.

[0006] Furthermore, the support is a step, with a first capillary on the bottom surface of the steam chamber and the surface of the step, and a second capillary inside the copper tube; the second capillary inside the copper tube above the step overlaps with the first capillary on the surface of the step.

[0007] Furthermore, the support column, steps, and lower cover plate are integrally formed.

[0008] Furthermore, the support is a powder column assembly, which includes a plurality of copper powder columns and a third capillary connected between the copper powder columns. The third capillary is used to support the copper tube, and its two ends overlap with the first capillary and the second capillary inside the copper tube above the third capillary, respectively.

[0009] Furthermore, the copper powder column and the third capillary of the powder column assembly are integrally molded.

[0010] Furthermore, the steam chamber is divided into a core evaporation zone and a non-core evaporation zone, with the powder column assembly located in the core evaporation zone.

[0011] Furthermore, the powder column assembly includes four copper powder columns, with the third capillary being cross-shaped.

[0012] Furthermore, a fourth capillary is provided on the top surface of the steam chamber.

[0013] Furthermore, a fifth capillary is fitted onto the support column.

[0014] The beneficial effects of this utility model are as follows: while increasing the capillary return water volume, this utility model also provides support for the upper copper tube. It has a simple structure, high heat dissipation efficiency, simple process, and low cost. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the 3D heat spreader plate from one angle according to an embodiment of this utility model.

[0016] Figure 2 This is a three-dimensional structural diagram of the 3D heat spreader from another angle, according to an embodiment of this utility model.

[0017] Figure 3 This is an exploded view of the 3D heat spreader of this utility model embodiment.

[0018] Figure 4 This is a cross-sectional schematic diagram of the 3D heat spreader according to an embodiment of the present invention.

[0019] Figure 5 This is a top view of the lower cover plate according to an embodiment of the present utility model.

[0020] Figure 6 This is a perspective view of the powder column assembly according to an embodiment of the present utility model.

[0021] Figure 7 This is a perspective view of the step according to an embodiment of the present invention.

[0022] Figure 8 This is a perspective view of the support column according to an embodiment of the present utility model.

[0023] Figure 9 This is a structural diagram of the fifth capillary in an embodiment of the present invention.

[0024] Explanation of icon numbers 1. Steam chamber, 2. Core evaporation zone, 10. Lower cover plate, 11. Support column, 12. Fifth capillary, 13. Step, 14. First capillary, 15. Copper powder column, 16. Third capillary, 20. Upper cover plate, 21. Fourth capillary, 22. Through hole, 30. Copper tube, 31. Second capillary. Detailed Implementation

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In this embodiment of the invention, directional indicators (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0028] Please refer to Figures 1-9 The 3D heat spreader of this utility model embodiment includes a lower cover plate, an upper cover plate, and several copper tubes. The upper cover plate covers the lower cover plate to form a steam chamber. The upper cover plate has a through hole. The copper tubes are installed on the upper cover plate and pass through the through hole to communicate with the steam chamber. The steam chamber is filled with a working fluid. The working fluid can be pure water.

[0029] The steam chamber is equipped with several support columns to support the lower and upper cover plates. A fifth capillary is fitted onto each support column. The fifth capillary is preferably a powder ring, i.e., made of sintered copper powder; the support columns are made of copper columns, and the powder ring can be directly fitted onto the copper columns.

[0030] The lower cover plate is equipped with a support for supporting the copper tube. The support is a step and / or a powder column assembly. Preferably, the steam chamber is divided into a core evaporation zone and a non-core evaporation zone, with the powder column assembly located in the core evaporation zone and the step located in the non-core evaporation zone.

[0031] The bottom surface of the steam chamber and the surface of the step are provided with first capillaries, and the copper tube is provided with second capillaries. The top surface of the steam chamber is provided with fourth capillaries. The second capillaries in the copper tube above the step overlap with the first capillaries on the surface of the step. The support column, the step, and the lower cover plate are integrally formed. The lower cover plate is formed by forging (cold forging) process, and the upper cover plate is formed by stamping process. Copper powder is used as capillaries for the lower cover plate. Copper powder capillaries are covered to the bottom of the lower cover plate and the step using special tooling. An open channel is provided in the middle of the step. The heat source steam flows into the copper tube through the channel, exchanges heat with the outside, and after the gas condenses into liquid, it is transported to the step capillaries (first capillaries) through the second capillaries (grooves and capillaries) in the copper tube, and then transported to the heat source to form an effective evaporation and condensation cycle. In specific implementation, the lower cover plate is made of 80-100 mesh electrolytic copper powder, which is sintered at 860℃ in a bell furnace for 2 hours to form 0.7mm copper powder capillaries (i.e., first capillaries). The capillaries cover the bottom of the lower cover plate and the surface of the step. The top cover plate is formed by oxygen-free copper stamping process. The top cover plate is made of 80-100 mesh electrolytic copper powder and sintered at 860℃ for 2 hours in a bell furnace to form 0.4mm copper powder capillary (i.e., the fourth capillary).

[0032] The powder column assembly includes several copper powder columns and a third capillary connecting the copper powder columns. The third capillary supports the copper tube, and its two ends overlap with the first capillary and the second capillary inside the copper tube above it, respectively. The copper powder columns and the third capillary of the powder column assembly are integrally formed.

[0033] In one implementation, the powder column assembly includes four copper powder columns, with the third capillary being cross-shaped. The four copper powder columns are sintered together with copper powder using a graphite jig, directly forming a cross-shaped capillary structure (i.e., the third capillary). This structure increases the capillary return water volume while also providing support for the upper copper pipe.

[0034] The preparation method of the 3D heat spreader in this embodiment of the utility model includes steps 1 to 5.

[0035] Step 1: Prepare the lower cover and upper cover. The lower cover and upper cover are sintered using electrolytic copper powder, forming the first capillary and the fourth capillary on the lower cover and upper cover respectively. Specifically, the lower cover plate is made of 80-100 mesh electrolytic copper powder and sintered in a bell furnace at 860℃ for 2 hours to form 0.7 mm copper powder capillary, which covers the bottom of the lower cover plate and the surface of the steps. The upper cover plate is formed using an oxygen-free copper stamping process. The upper cover plate is made of 80-100 mesh electrolytic copper powder and sintered in a bell furnace at 860℃ for 2 hours to form 0.4 mm copper powder capillary.

[0036] Step 2: Sinter the powder column assembly, install the powder column assembly onto the lower cover, and assemble the upper cover onto the lower cover. Weld the upper and lower covers together using diffusion welding. In practice, use appropriate tooling to sinter the copper column into a powder column assembly and a powder ring. Place the powder column assembly on the protrusion of the lower cover plate, and fit the powder ring onto the copper column (support). Then, attach the sintered capillary upper cover plate to the lower cover plate and weld the upper and lower cover plates together using diffusion welding equipment at a high temperature of 860℃ for 2 hours and a pressure of 20T.

[0037] Step 3: Prepare the copper tube. Insert the copper tube through the upper cover plate into the steam chamber, connecting the second capillary inside the copper tube with the first or third capillary below. Then weld the copper tube to the upper and lower cover plates accordingly. In specific implementation, the copper tube uses an oxygen-free copper grooved tube with a diameter of 8mm, a length of 138.5mm, and 110 teeth as the main body. One-third of the length of the tube is sintered with 0.5mm thick copper powder as capillary. Insert the sintered copper tube into the steam chamber through the through-hole of the upper cover plate, so that the copper tube is inserted into the capillary groove on the step of the lower cover plate, connecting the copper tube capillary (second capillary) with the lower cover plate capillary (first capillary). Then, using a 2% silver copper-phosphorus brazing ring, weld the copper tube to the upper and lower cover plates together. Melt the solder in a brazing furnace at 600℃ in the low-temperature zone, 840℃ in the high-temperature zone, and a furnace speed of 200mm / min. The copper tube capillary and the lower cover plate capillary overlap of this utility model are reliable, which enhances the evaporation and condensation effect of the heat spreader, improves product performance, and makes the product consistency more stable. It is suitable for mass production and has a relatively low cost.

[0038] Step 4: Annealing and reduction, then inject the working medium into the steam chamber. After the copper tube is welded to the upper and lower cover plates, it is annealed and reduced at a constant temperature of 610℃ for 1.5 hours using a bell furnace. After the helium detector confirms that there is no gas leakage in the product, ultrapure water is injected inside as the working medium (i.e., the working medium).

[0039] Step 5: Degas and seal the product (use a degassing machine to degas and seal the product to complete the manufacturing process) to obtain a 3D heat spreader.

[0040] 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 3D heat spreader, comprising a lower cover plate, an upper cover plate, and a plurality of copper tubes, wherein the upper cover plate is fitted onto the lower cover plate to form a steam chamber, the copper tubes are mounted on the upper cover plate and pass through the upper cover plate to communicate with the steam chamber, and the steam chamber is filled with a working fluid, characterized in that, The steam chamber is equipped with several support columns for supporting the lower cover plate and the upper cover plate, and the lower cover plate is equipped with support components for supporting the copper pipe.

2. The 3D heat spreader as described in claim 1, characterized in that, The support is a step, with a first capillary on the bottom surface of the steam chamber and the surface of the step, and a second capillary inside the copper tube; the second capillary inside the copper tube above the step overlaps with the first capillary on the surface of the step.

3. The 3D heat spreader as described in claim 2, characterized in that, The support column, steps, and lower cover plate are integrally formed.

4. The 3D heat spreader as described in claim 1, characterized in that, The support is a powder column assembly, which includes several copper powder columns and a third capillary connecting the copper powder columns. The third capillary is used to support the copper tube, and its two ends overlap with the first capillary and the second capillary inside the copper tube above the third capillary, respectively.

5. The 3D heat spreader as described in claim 4, characterized in that, The copper powder column and the third capillary of the powder column assembly are integrally molded.

6. The 3D heat spreader as described in claim 4, characterized in that, The steam chamber is divided into a core evaporation zone and a non-core evaporation zone, with the powder column assembly located in the core evaporation zone.

7. The 3D heat spreader as described in claim 4, characterized in that, The powder column assembly includes four copper powder columns, with the third capillary being cross-shaped.

8. The 3D heat spreader as described in claim 1, characterized in that, A fourth capillary is provided on the top surface of the steam chamber.

9. The 3D heat spreader as described in claim 1, characterized in that, A fifth capillary is fitted onto the support column.

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