A processing technique of a heat pipe embedded uniform temperature plate

Abstract

The application discloses a processing technology of a heat pipe embedded uniform temperature plate, optimizes the structure of a plate body, can adopt an aluminum extrusion process to produce the plate body, reduces processing cost, meanwhile, utilizes end covers to close through holes, and only aluminum alloy material exists on the outer surface of the uniform temperature plate, so that electrochemical corrosion cannot occur, and corrosion resistance of the uniform temperature plate is improved. The technical scheme is as follows: a processing technology of a heat pipe embedded uniform temperature plate, comprising the following steps: utilizing extrusion forming to process a plate body with multiple through holes; treating the plate body, so that the inner surface of the through hole has a plating layer, the material of the plating layer is a weldable metal; inserting a heat pipe into the through hole, and utilizing welding or adhesion to fix the heat pipe in the through hole; fixing end covers on the two end faces of the plate body along the length direction of the through hole, the end cover and the plate body form an integrated structure, the end cover covers all the through holes, and the material of the end cover is consistent with that of the plate body, and belongs to the technical field of heat dissipation devices.

Description

Technical Field

[0001] This invention belongs to the field of heat dissipation device technology, and more specifically, relates to the processing technology of a vapor chamber with built-in heat pipe. Background Technology

[0002] To improve heat dissipation, heat pipes are embedded in the aluminum plate, allowing the plate to quickly and evenly distribute its temperature, thus forming a heat spreader. However, the success of embedding the heat pipes within the aluminum plate is also a crucial question.

[0003] For example, CN112091532A discloses a heat-conducting plate with a built-in heat pipe and its preparation method. Several deep holes are processed inside the heat-conducting plate, and the heat pipe is buried in the deep holes to achieve heat dissipation on both sides. The two sides of the heat-conducting plate can be processed into arbitrary shapes. Solder is added into the gap between the heat pipe and the deep holes, and induction welding is used to melt the solder and fully and evenly fill the gap.

[0004] In the above preparation method, the deep hole on the heat-conducting plate is a blind hole. In addition, the diameter of the heat pipe is generally small. Therefore, the heat-conducting plate cannot be directly molded to form the blind hole. The blind hole can only be further processed on the heat-conducting plate after it is formed, which is very costly. According to the description in the instruction manual, the deep hole is generally processed by wire machining, which is not only costly but also time-consuming.

[0005] Furthermore, according to its instruction manual, in order to make the surface of the aluminum alloy plate weldable, the surface of the aluminum alloy plate needs to have an electroplating layer, which is usually silver or tin. Since the aluminum alloy, the plating layer and the solder are different materials, and the deep hole is only closed at one end, the other end will expose the aluminum alloy, the plating layer and the solder, which is very easy to cause electrochemical corrosion. The heat-conducting plate has poor corrosion resistance, which affects the heat conduction capacity between the heat pipe and the plate.

[0006] Therefore, the existing technology for heat pipe-embedded vapor chambers has high processing costs and poor corrosion resistance. Summary of the Invention

[0007] The main objective of this invention is to provide a processing technology for a vapor chamber with built-in heat pipes, which optimizes the structure of the plate and allows for the production of the plate using an aluminum extrusion process, simplifying the processing technology and reducing processing costs. At the same time, by using end caps to seal the through holes, the outer surface of the vapor chamber is made of only aluminum alloy material, which will not cause electrochemical corrosion and improves the corrosion resistance of the vapor chamber.

[0008] According to a first aspect of the present invention, a process for manufacturing a vapor chamber with a built-in heat pipe is provided, comprising the following steps:

[0009] Step 1: Use extrusion molding to process a plate with multiple through holes;

[0010] Step 2: Process the plate body to give the inner surface of the through hole a plating layer, the plating layer being made of a weldable metal;

[0011] Step 3: Insert the heat pipe into the through hole and fix it in place using welding or bonding;

[0012] Step 4: Fix end caps on the two end faces of the plate along the length of the through holes. The end caps form an integral structure with the plate and cover all the through holes. The material of the end caps is the same as that of the plate.

[0013] In the above-mentioned processing technology of the heat pipe-embedded vapor chamber, in step 4, grooves are machined on the two end faces of the plate along the length of the through holes. The grooves are connected to all the through holes, and the end caps are embedded in the grooves.

[0014] In the above-mentioned processing technology of the heat pipe-embedded vapor chamber, the end cap and the plate body are fixed together by friction stir welding, argon arc welding or laser welding.

[0015] In the above-mentioned processing technology of the heat pipe-embedded vapor chamber, the coating on the surface to be welded and in the weld seam is removed before welding.

[0016] In the above-mentioned processing technology of the heat pipe-embedded vapor chamber, the material of the plate is aluminum alloy.

[0017] In the above-mentioned processing technology of the vapor chamber with built-in heat pipe, the material of the coating is nickel, silver or copper.

[0018] In the above-mentioned processing technology of the heat spreader with built-in heat pipe, in step 3, the heat pipe is fixed in the through hole by soldering.

[0019] In the above-mentioned processing technology of the heat spreader with built-in heat pipe, in step 3, the heat pipe is fixed in the through hole by using thermally conductive adhesive.

[0020] In the above-mentioned processing technology of the heat pipe-embedded vapor chamber, the plate is flat, the length direction of the plate is parallel to the length direction of the through holes, and the multiple through holes are arranged at intervals along the width direction of the plate.

[0021] In the above-mentioned processing technology of the heat pipe-embedded vapor chamber, the plate is flat, the width direction of the plate is parallel to the length direction of the through holes, and a plurality of through holes are arranged at intervals along the length direction of the plate.

[0022] One of the above-described technical solutions of the present invention has at least one of the following advantages or beneficial effects:

[0023] In this invention, the structure of the plate is optimized by designing through holes on the plate to install heat pipes. Since the holes are through holes, the entire plate can be processed using aluminum extrusion, which reduces processing costs and eliminates the need for additional hole processing, thus simplifying the processing technology.

[0024] However, due to the through-hole structure, both ends of the plate are open, exposing both ends of the through holes. In this case, the problem of electrochemical corrosion still exists. To solve this problem, grooves are machined on the open ends of the plate, and end caps that fit the grooves are machined. The end caps are then embedded into the grooves to seal all the through holes. The plate and end caps are welded using friction stir welding, TIG welding, or laser welding, without the need for other materials. Both the end caps and the plate are made of aluminum alloy, making the outer surface of the heat spreader aluminum alloy, which prevents electrochemical corrosion and improves corrosion resistance. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0026] Figure 1 This is a flowchart of the first embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the heat spreader plate processed according to the first embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal structure of the heat spreader plate processed according to the first embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the plate with grooves processed according to the first embodiment of the present invention.

[0030] The figure labels for each figure are as follows:

[0031] 1. Plate body; 11. Through hole; 12. Groove; 2. Heat pipe; 3. End cap. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] The following disclosure provides many different implementations or examples for different ways of implementing the present invention.

[0034] Reference Figures 1 to 4 As shown, in one embodiment of the present invention, the processing technology of a heat spreader with a built-in heat pipe 2 includes the following steps:

[0035] Step 1: The plate 1 with multiple through holes 11 is processed by extrusion molding. The plate 1 is generally made of aluminum alloy. Since the heat pipe 2 is installed by using through holes 11, the two ends of the plate 1 along the length of the through holes 11 are open. This structure can be processed by aluminum extrusion. The corresponding mold is designed so that the aluminum material is extruded through the mold and then cut to form the plate 1 with multiple through holes 11. No additional hole processing is required, which greatly reduces the processing cost. In contrast, the aluminum plate used in the existing technology for burying the heat pipe 2 cannot be formed in one step by aluminum extrusion.

[0036] Step 2: Process board 1 to give the inner surface of the through holes of board 1 a plating layer. The plating layer is made of a solderable metal. Generally, the plating layer is made of nickel, silver or copper, which allows the solder to be fixed to the aluminum alloy.

[0037] Step 3: Insert heat pipe 2 into through hole 11 and fix heat pipe 2 in through hole 11 by soldering; specifically, heat pipe 2 is fixed in through hole 11 by soldering, and the solder can be solidified between the inner wall of through hole 11 and the outer wall of heat pipe 2 to ensure that the heat on plate 1 can be transferred to heat pipe 2.

[0038] Step 4: Grooves 12 are machined on the two end faces of the plate 1 along the length of the through holes 11. The grooves 12 are connected to all the through holes 11. End caps 3 are machined to fit the grooves 12. The end caps 3 are embedded in the grooves 12. Using friction stir welding, the end caps 3 are fixed to the plate 1 to form an integral structure. The end caps 3 cover all the through holes 11. The material of the end caps 3 is the same as that of the plate 1, which is aluminum alloy. The grooves 12 are for the convenience of friction stir welding and to prevent the end caps 3 from shifting under pressure during welding.

[0039] Since it has a through-hole 11 structure, both ends of the plate 1 are open, exposing both ends of the through-hole 11. In this case, the electrochemical corrosion problem still exists. To solve this problem, a groove 12 is machined on the open end of the plate 1, and an end cap 3 that fits the groove 12 is machined. The end cap 3 is embedded into the groove 12 to seal all the through-holes 11. The plate 1 and the end cap 3 are welded using friction stir welding. No other solder is needed. The end cap 3 and the plate 1 are both made of aluminum alloy, so that the outer surface of the heat spreader is made of aluminum alloy, which prevents electrochemical corrosion and improves corrosion resistance. The solder can fill the space between the inner wall of the through-hole 11 and the outer wall of the heat pipe 2, ensuring that heat transfer is not affected.

[0040] Furthermore, the process of machining the groove 12 on the plate 1 is very simple. It can be directly milled on the end face of the open end, and the end cap 3 can also be directly stamped out, so the processing cost can be effectively controlled.

[0041] Preferably, the groove 12 is an elongated hole shape, which only requires one milling cut, making it simple and convenient.

[0042] In some other embodiments, the end cap 3 and the plate 1 are fixed by argon arc welding or laser welding, so that the groove 12 does not need to be processed.

[0043] In this embodiment, there are two processing methods for the coating. One is to cover the plate body 1 except for the through hole 11, so that the coating is only generated on the inner surface of the through hole 11. The other is to coat the entire plate body 1. After the heat pipe 2 is welded, the coating of other parts of the plate body 1 is removed by mechanical processing or other methods. In particular, before welding the end cap 3, the coating of the position to be welded and the weld seam must be removed to ensure that the end cap 3 and the plate body 1 form an integral structure and are made of the same material, so as to avoid the through hole 11 being exposed.

[0044] In this embodiment, the plate 1 is flat, and the length direction of the plate 1 is parallel to the length direction of the through hole 11. Multiple through holes 11 are arranged at intervals along the width direction of the plate 1. The heat pipe 2 has only one layer, which allows the heat pipe 2 to receive heat from both sides, resulting in better heat absorption efficiency and strong applicability. The flow path of the phase change working medium in the heat pipe 2 is also longer, resulting in more sufficient heat exchange.

[0045] Of course, it is also feasible for plate 1 to have the same length and width.

[0046] In some other embodiments, the plate 1 is flat, and the width direction of the plate 1 is parallel to the length direction of the through hole 11. The multiple through holes 11 are arranged at intervals along the length direction of the plate 1.

[0047] In some other embodiments, the cross-section of the through hole 11 can be elliptical to facilitate the installation of the flattened heat pipe 2, thereby reducing the overall thickness of the heat spreader.

[0048] In some other embodiments, the heat pipe 2 can be fixed in the through hole 11 by thermally conductive adhesive. The inner surface of the through hole 11 may or may not have a coating. The heat pipe 2 may come into contact with the inner surface of the through hole 11 or with the coating. In this case, the end cap 3 is still needed to close the open end of the plate 1 and close the through hole 11 to avoid electrochemical corrosion.

[0049] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A process for manufacturing a heat pipe embedded uniform temperature plate, characterized by, The method comprises the following steps: Step 1: using extrusion molding to process a plate body with multiple through holes; Step 2: processing the plate body to have a plating layer on the inner surface of the through holes, the material of the plating layer being a solderable metal; Step 3: inserting a heat pipe into the through hole and using soldering or adhesion to fix the heat pipe in the through hole; Step 4: fixing end caps on the two end faces of the plate body along the length direction of the through holes, the end caps being integrated with the plate body, the end caps covering all the through holes, and the material of the end caps being the same as that of the plate body; Processing grooves on the two end faces of the plate body along the length direction of the through holes, the grooves being communicated with all the through holes, and the end caps being embedded in the grooves; The end caps and the plate body are fixed together by friction stir welding, argon arc welding or laser welding, and the plating layer on the surface to be welded and in the weld is removed before welding.

2. The heat pipe embedded uniform temperature plate processing technology according to claim 1, characterized in that, The material of the plate body is aluminum alloy.

3. The heat pipe embedded uniform temperature plate processing method according to claim 1, wherein, The material of the plating layer is nickel, silver or copper.

4. The heat pipe embedded uniform temperature plate processing method according to claim 1, wherein, In step 3, the heat pipe is fixed in the through hole by soldering.

5. The heat pipe embedded uniform temperature plate processing method according to claim 1, wherein, In step 3, the heat pipe is fixed in the through hole by adhesion.

6. The heat pipe embedded uniform temperature plate processing method according to any one of claims 1-5, characterized in that, The plate body is flat, the length direction of the plate body is parallel to the length direction of the through holes, and multiple through holes are arranged along the width direction of the plate body.

7. The heat pipe embedded uniform temperature plate processing method according to any one of claims 1-5, characterized in that, The plate body is flat, the width direction of the plate body is parallel to the length direction of the through holes, and multiple through holes are arranged along the length direction of the plate body.

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