Vapor chamber of wick structure and manufacturing method

Abstract

The invention belongs to the field of heat dissipation of electronic devices, and relates to a vapor chamber of a wick structure and a manufacturing method. Comprising an upper cover plate, a lower cover plate, an aluminum flat pipe, a liquid filling pipe, a sintering silk screen and sintering powder, the structural design of the uniform temperature plate is optimized, the production process and the welding method of the uniform temperature plate are optimized, the welding types involved in the manufacturing method comprise vacuum brazing, argon arc welding, electric resistance welding or friction stir welding, the total number of times of welding used in the manufacturing method is three, and the number of times of welding used in the manufacturing method is three. Compared with an existing vapor chamber manufacturing method, the method has the advantages that the related welding types are fewer, the total number of times of welding is fewer, the welding efficiency and the production efficiency of the vapor chamber are improved, diffusion welding has the risk that the aluminum alloy vapor chamber is pressed to collapse, and therefore compared with diffusion welding, vacuum brazing is more suitable for welding the aluminum alloy vapor chamber; and the manufacturing method has fewer welding times and fewer risk points.

Description

Technical Field

[0001] The invention belongs to the field of heat dissipation of electronic devices and relates to a temperature averaging plate with a liquid wick structure and a manufacturing method thereof. Background Art

[0002] As a phase change heat transfer element, the temperature spreader has become the mainstream solution for heat dissipation of some high-performance electronic components. When the temperature spreader is working, the heat flux of the heat source is transferred from the evaporation end to the condensation end, and then from the condensation end to the heat sink with a larger surface area by heat conduction, and finally the heat is taken away by convection heat transfer. At present, many companies at home and abroad have been able to mass-produce temperature spreaders, but the manufacturing cost is high and the yield rate is relatively low. The main reason for the high manufacturing cost of the temperature spreader is due to the high manufacturing cost of its liquid wick and the low efficiency of the welding process. The manufacturing process of the traditional temperature-averaging plate is to first make a graphite mold, fill the mold with copper powder or aluminum powder, then clamp the cover plate and the graphite mold with a clamp, send them into a sintering furnace for welding and sintering, and then use the same method to weld and sinter the other side cover plate, finally, use diffusion welding to weld the upper cover plate, support column, and lower cover plate together, and then use argon arc welding to weld the filling tube to the temperature-averaging plate. After the inner cavity of the temperature-averaging plate is filled with liquid working fluid, resistance welding is used to seal the filling tube to complete the manufacturing of the temperature-averaging plate. The total number of welding times is four, and the welding methods involved are welding sintering, diffusion welding, argon arc welding, and resistance welding. Since the upper and lower cover plates both adopt a sintered powder liquid wick structure, the upper and lower cover plates of this temperature-averaging plate need to be sintered separately, the welding process is inefficient, involves many welding methods, and the operation is cumbersome. In addition, the use of graphite molds will increase costs. In addition, the use of diffusion welding is likely to cause the inner cavity of the product to collapse, affecting the product yield. Summary of the invention

[0003] Purpose of the Invention

[0004] A temperature averaging board with a liquid wick structure is provided, the structural design of the temperature averaging board is optimized, the production process and welding method of the temperature averaging board are optimized, the product yield and welding process efficiency are improved, and it can be used for heat dissipation control under high heat flux density in aerospace, electronics, laser weapons, high-power IGBT, etc., and has good application prospects.

[0005] Technical Solution

[0006] A temperature balancing plate with a liquid wick structure comprises an upper cover plate, a lower cover plate, an aluminum flat tube, a liquid-filled tube, a sintered wire mesh, and sintered powder, wherein the liquid-filled tube is assembled and welded by argon arc welding after the main body of the temperature balancing plate is brazed. A support column is provided in the groove of the lower cover plate, and the support column is divided into a first support column and a second support column. The height of the first support column is greater than that of the second support column. The aluminum flat tube is laid on the second support column and is limited by the first support column. The surrounding and lower part of the aluminum flat tube are filled with powder, and the powder is a mixture of aluminum powder and solder. The sintered powder forms a shape matching the profile of the aluminum flat tube. The aluminum flat tube is provided with a first hole running longitudinally and a second hole running transversely. The first hole and the second hole are both arranged in an array. The first hole is used to collect the evaporated gas and transfer it to the second hole running transversely, and the first hole transfers the evaporated gas to the sintered powder, condenses to form liquid, and takes away the heat. The second hole diffuses the heat to the entire temperature equalizing plate to achieve the purpose of temperature uniformity. The sintered wire mesh is laid flat on the aluminum flat tube, and the upper cover plate is covered on the sintered wire mesh and fixedly connected to the lower cover plate by bolts. The sintered wire mesh is provided with solder foil. The upper cover plate, the lower cover plate, the aluminum flat tube, the sintered powder, and the sintered wire mesh are welded together at one time by vacuum brazing.

[0007] Furthermore, the one-time welding is specifically the simultaneous welding of the lower cover plate, powder, and aluminum flat tube, and the simultaneous welding of the upper cover plate, sintered wire mesh, and lower cover plate.

[0008] Furthermore, the upper cover plate and the lower cover plate are usually made of 6 series aluminum alloy material.

[0009] Furthermore, the sintering powder is specifically aluminum powder, and the filling is performed by vibration filling to make the powder filling compact.

[0010] Furthermore, the aluminum flat tube is usually made of aluminum alloy material, and holes are punched in the thickness direction of the aluminum flat tube to allow hot steam to flow from the sintered powder to the aluminum flat tube, and then diffuse the hot steam through the transverse channel of the aluminum flat tube to achieve a uniform temperature effect.

[0011] Furthermore, the liquid-filled tube is a 1060 aluminum alloy tube with a softer texture and thicker wall thickness.

[0012] Furthermore, the sintered wire mesh is made of stainless steel and is sintered by multiple layers of wire meshes with different mesh sizes.

[0013] The liquid filling ports of the upper cover plate and the lower cover plate are both provided with packaging process bosses.

[0014] The liquid filling pipe is welded by argon arc welding, and a stainless steel wire is inserted into the pipe during welding to avoid clogging of the liquid filling pipe.

[0015] The diameter of the support column in the lower cover plate is 4 mm, and the spacing between the support columns is 8 mm.

[0016] The edges of the upper cover plate and the lower cover plate are provided with welding process holes with a diameter of 3.2 mm.

[0017] A method for manufacturing a temperature averaging plate with a liquid wick structure, comprising the following steps:

[0018] Step 1: Clean the parts and pickle the upper cover plate, lower cover plate and aluminum flat tube to remove the oxide film and other impurities on the surface of the parts and eliminate the influence of the oxide film and other impurities on the vacuum brazing. The pickling temperature is controlled between room temperature and 60°C. After pickling, put the parts into the drying oven for drying to prevent corrosion caused by residual moisture.

[0019] Step 2: Machining the upper and lower covers. The support columns in the lower cover are integrally formed. Compared with the welded support columns of traditional temperature equalizers, they are stronger and will not cause welding defects. During machining, it should be noted that the height difference between the first support column and the second support column should be slightly smaller than the thickness of the aluminum flat tube to ensure that the aluminum flat tube can fit tightly with other parts during welding. When machining the reserved hole for the filling tube of the lower cover, the diameter of the reserved hole should be matched with the filling tube to ensure that the filling tube and the lower cover are tightly assembled. Figure 2 , Figure 3 shown.

[0020] Step 3: Fill a layer of aluminum powder for sintering in the lower cover plate with a thickness consistent with the height of the second support column. Place the lower cover plate horizontally on the vibration platform, spread an excess of aluminum powder in the groove of the lower cover plate, turn on the vibration platform, and allow the aluminum powder to fully fill the lower cover plate under the action of the vibration platform. After filling, scrape off the excess powder.

[0021] Step 4. Lay all the aluminum flat tubes flat on the second support column in the lower cover. Each aluminum flat tube is limited in position by the surrounding first support columns to prevent it from sliding during vibration. When laying the aluminum flat tubes, pay attention to laying them flat to avoid uneven laying that may cause leakage in the uniform temperature plate welding.

[0022] Step 5. Fill the powder. The powder is filled around the aluminum flat tube. The height of the powder filling should be consistent with the height of the first support column. Turn on the vibration platform during filling, but be careful that the vibration amplitude of the vibration platform should not be too large to prevent the aluminum flat tube from popping out of the lower cover due to excessive vibration.

[0023] Step 6: Use laser cutting to cut the sintered wire mesh into multiple circular through holes arranged in an array and of a size that matches the first support column. After cutting, grind the edges of the circular through holes to avoid burrs caused by cutting that make the sintered wire mesh unevenly laid and unable to fit closely with other parts, resulting in obstruction of the circulation of the working medium inside the temperature-averaging plate. Lay the polished sintered wire mesh in conjunction with the first support column of the lower cover plate. During laying, ensure that each circular through hole is matched with the first support column to avoid the first support column lifting the sintered wire mesh. The upper surface of the laid sintered wire mesh is at the same height as the first support column and the outer frame of the groove in the lower cover plate.

[0024] Step 7. Punch holes in the vacuum brazing solder foil according to the welding process holes around the lower cover plate, with the same diameter as the welding process holes. Then lay the punched vacuum brazing solder foil flat on the sintered wire mesh, the first support column of the lower cover plate, and the groove outer frame. Lay the upper cover plate on the vacuum brazing solder foil, use M3 bolts to pass through all the welding process holes of the upper cover plate, vacuum brazing solder foil, and lower cover plate in turn, and tighten the other side of the bolt with a nut.

[0025] Step 8. Assemble the temperature-averaging plate with bolts installed on the brazing fixture, clamp the upper and lower covers of the temperature-averaging plate, and use a feeler gauge to measure the gap between the upper and lower covers. The gap should not exceed 0.08mm. After measurement, send the temperature-averaging plate and the fixture into the brazing furnace for vacuum brazing.

[0026] Step 9. After brazing, prepare to weld the liquid filling tube. Before welding, use coarse sandpaper to lightly grind the outer surface of the welding position of the liquid filling tube to remove the surface oxide film to avoid the adverse effect of the surface oxide film on welding. Use argon arc welding to weld the liquid filling tube to the reserved hole of the temperature equalizing plate. During welding, insert stainless steel wire into the liquid filling tube to avoid large back penetration of the welding, which may cause the liquid filling tube to be blocked.

[0027] Step 10: Fill the inner cavity of the temperature equalizer with liquid working fluid. The type of working fluid is selected according to the specific operating temperature of the product. Use vacuum filling equipment to vacuum fill the temperature equalizer. The specific principle is to first evacuate the inner cavity of the temperature equalizer to a negative pressure state, and then inject the liquid working fluid into the inner cavity of the temperature equalizer.

[0028] Step 11. Seal the filling tube. Seal the filling tube of the temperature equalizer by resistance welding or stir friction welding. The sealing position is the root of the connection between the packaging process boss and the temperature equalizer. When sealing, seal from the direction of the upper cover plate. Because the upper cover plate is thinner than the lower cover plate, it is easy to seal. The width of the sealing weld should be at least 10mm, and it should be distributed as evenly as possible on both sides of the root of the packaging process boss to ensure that the working fluid in the inner cavity of the temperature equalizer will not leak after the packaging process boss is removed, and there will be no unwelded gaps in the appearance after machining to remove the packaging process boss.

[0029] Step 12: Use machining to remove the packaging process boss to complete the manufacture of the temperature equalization board.

[0030] The beneficial effects of this application are:

[0031] A manufacturing method of a temperature-averaging plate with a liquid-absorbing core structure is studied to optimize the structural design of the temperature-averaging plate, the production process and the welding method of the temperature-averaging plate. This manufacturing method involves three types of welding, namely vacuum brazing, argon arc welding, resistance welding or stir friction welding. The total number of welding times used in this manufacturing method is 3 times. Compared with the existing manufacturing method of the temperature-averaging plate, the number of welding types involved is less, the total number of welding times is less, and the welding efficiency and production efficiency of the temperature-averaging plate are improved. Since diffusion welding has the risk of collapsing the aluminum alloy temperature-averaging plate, vacuum brazing is more suitable for welding aluminum alloy temperature-averaging plates than diffusion welding, and this manufacturing method has fewer welding times and fewer risk points. Therefore, this manufacturing method is also conducive to improving the yield rate of the temperature-averaging plate. This manufacturing method of the temperature-averaging plate is applicable to all temperature-averaging plates produced based on the principle of VC temperature-averaging plates, that is, temperature-averaging plates that diffuse heat through the phase change evaporation cycle of the inner cavity liquid working medium, and improves the production efficiency and yield rate of the temperature-averaging plate. At present, with the continuous increase in the functions of electronic devices and the continuous improvement in performance, the requirements for heat dissipation are also getting higher and higher. As an efficient heat dissipation solution, the temperature vapor chamber can effectively improve the heat dissipation capacity of electronic equipment and maintain stable operation of the equipment. The manufacturing method with higher production efficiency and yield rate will further reduce the manufacturing cost of the temperature vapor chamber, and it has good application prospects in the field of temperature vapor chamber manufacturing in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of a temperature equalizing plate with a liquid wick structure.

[0033] Among them, there are an upper cover plate 1, a lower cover plate 2, an aluminum flat tube 3, a liquid filling tube 4, a sintered wire mesh 5, and a sintered powder 6.

[0034] Figure 2 It is a structural schematic diagram of the upper cover plate 1.

[0035] Figure 3 It is a schematic diagram of the structure of the lower cover plate 2.

[0036] Figure 4 It is a schematic diagram of the structure of the aluminum flat tube 3.

[0037] Figure 5 It is a schematic diagram of the structure of the liquid filling tube 4.

[0038] Figure 6 It is a schematic diagram of the structure of sintered wire mesh 5.

[0039] Figure 7 Schematic diagram of the structure of sintered powder 6. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail in combination with the embodiment of the present invention. In the example, the same or similar reference numerals throughout represent the same or similar originals or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below by reference are exemplary and intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention. The following is a detailed description in combination with the embodiments of the present invention.

[0041] The present invention discloses a temperature-averaging plate with a liquid-absorbing core structure, comprising an upper cover plate (1), a lower cover plate (2), an aluminum flat tube (3), a liquid-filling tube (4), a sintered wire mesh (5), and sintered powder (6), wherein the aluminum flat tube (3) is limited by a support column in a groove of the lower cover plate (2), the periphery and lower part of the aluminum flat tube (3) are filled with sintered powder (6), a large number of capillary pores are formed by the sintered powder (6) after high-temperature sintering, and the capillary pores generate capillary force to provide power for the circulation and reflux of working fluid inside the temperature-averaging plate, a sintered wire mesh is laid above the aluminum flat tube (3), a capillary structure exists in the sintered wire mesh, and power can be provided for the circulation and reflux of working fluid, the upper cover plate (1), the lower cover plate (2), the aluminum flat tube (3), the sintered powder (6), and the sintered wire mesh (5) are formed by integral vacuum brazing, the welding of the upper and lower cover plates (1) (2) and the aluminum flat tube (3) and the sintering of the powder are carried out simultaneously, thereby improving the production efficiency of the product.

[0042] Specific implementation steps:

[0043] After high-temperature sintering, the sintered powder (6) forms a large number of capillaries, which generate capillary force to provide power for the circulation and reflux of the working medium inside the temperature-averaging plate. A sintered wire mesh is laid on the top of the aluminum flat tube (3). The capillary structure in the sintered wire mesh can provide power for the circulation and reflux of the working medium. The upper cover plate (1), the lower cover plate (2), the aluminum flat tube (3), the sintered powder (6), and the sintered wire mesh (5) are integrally formed by vacuum brazing. The welding of the upper and lower cover plates (1) (2) and the aluminum flat tube (3) and the sintering of the powder are carried out simultaneously, thereby improving the production efficiency of the product.

[0044] Example

[0045] A temperature-averaging plate with a liquid-absorbing core structure comprises an upper cover plate (1), a lower cover plate (2), an aluminum flat tube (3), a liquid-filled tube (4), a sintered wire mesh (5), and sintered powder (6), wherein the liquid-filled tube (4) is assembled and welded by argon arc welding after the main body of the temperature-averaging plate is brazed. A support column is provided in the groove of the lower cover plate (2), and the support column is divided into a first support column and a second support column. The height of the first support column is greater than the height of the second support column. The aluminum flat tube (3) is laid on the second support column and is limited by the first support column. The surrounding and lower part of the aluminum flat tube (3) are filled with powder (6). The powder (6) is a mixture of aluminum powder and solder. After sintering, the powder (6) forms a shape matching the profile of the aluminum flat tube (3). The aluminum flat tube (3) has a first hole running longitudinally and a second hole running transversely. The first hole and the second hole are both arranged in an array. The first hole is used to After collecting the evaporated gas, the evaporated gas is transferred to the second hole penetrating in the horizontal direction, and the first hole transfers the evaporated gas to the sintered powder (6), condenses to form liquid, takes away the heat, and the second hole diffuses the heat to the entire temperature equalizing plate to achieve the purpose of temperature uniformity; the sintered wire mesh (5) is laid flat on the aluminum flat tube (3), the upper cover plate (1) covers the sintered wire mesh (5) and is fixedly connected to the lower cover plate (2) by bolts, the sintered wire mesh (5) is provided with solder foil, and the upper cover plate (1), the lower cover plate (2), the aluminum flat tube (3), the sintered powder (6), and the sintered wire mesh (5) are welded together at one time by vacuum brazing.

[0046] In a certain implementation case of the present invention, the one-time welding is specifically the simultaneous welding of the lower cover plate (2), powder (6), and aluminum flat tube (3), and the simultaneous welding of the upper cover plate (1), sintered wire mesh (5), and lower cover plate (2).

[0047] In a certain implementation case of the present invention, the upper cover plate (1) and the lower cover plate (2) are usually made of 6 series aluminum alloy material.

[0048] In a certain embodiment of the present invention, the sintering powder (6) is specifically aluminum powder, and the filling is performed by vibration filling to make the powder filling compact.

[0049] In a certain embodiment of the present invention, the aluminum flat tube (3) is usually made of aluminum alloy material, and holes are punched in the thickness direction of the aluminum flat tube to allow hot steam to flow from the sintered powder to the aluminum flat tube (3), and then the hot steam is diffused through the transverse channel of the aluminum flat tube (3) to achieve a uniform temperature effect.

[0050] In a certain embodiment of the present invention, the liquid-filled tube (4) is a 1060 aluminum alloy tube with a relatively soft texture and a relatively thick wall.

[0051] In a certain embodiment of the present invention, the sintered wire mesh (5) is made of stainless steel and is sintered by multiple layers of wire meshes with different mesh sizes.

[0052] The liquid filling ports of the upper cover plate (1) and the lower cover plate (2) are both provided with packaging process bosses.

[0053] The liquid filling pipe (4) is welded by argon arc welding, and a stainless steel wire is inserted into the pipe during welding to prevent the liquid filling pipe (4) from being blocked.

[0054] The diameter of the support columns in the lower cover plate (2) is 4 mm, and the spacing between the support columns is 8 mm.

[0055] The edges of the upper cover plate (1) and the lower cover plate (2) are provided with welding process holes with a diameter of 3.2 mm.

[0056] A method for manufacturing a temperature averaging plate with a liquid wick structure, comprising the following steps:

[0057] Step 1: Clean the parts and pickle the upper cover plate (1), the lower cover plate (2) and the aluminum flat tube (3) to remove the oxide film and other impurities on the surface of the parts and eliminate the influence of the oxide film and other impurities on the vacuum brazing. The pickling temperature is controlled between room temperature and 60° C. After pickling, the parts are placed in a drying oven for drying to prevent corrosion caused by residual moisture.

[0058] Step 2: Machine the upper cover plate (1) and the lower cover plate (2), wherein the support column in the lower cover plate (2) is formed as an integral piece, which is stronger than the welded support column of the traditional temperature equalizer and will not cause welding defects. During machining, it should be noted that the height difference between the first support column and the second support column should be slightly smaller than the thickness of the aluminum flat tube (3) to ensure that the aluminum flat tube (3) and other parts can be tightly fitted during welding. When machining the reserved hole for the liquid filling tube of the lower cover plate (2), the diameter of the reserved hole should be matched with the liquid filling tube (4) to ensure that the liquid filling tube (4) and the lower cover plate (2) are tightly assembled. Figure 2 , Figure 3 shown.

[0059] Step 3: Fill the lower cover plate (2) with a layer of aluminum powder for sintering, the thickness of which is consistent with the height of the second support column, place the lower cover plate (2) horizontally on a vibration platform, and sprinkle an excessive amount of aluminum powder in the groove of the lower cover plate (2). Turn on the vibration platform to allow the aluminum powder to fully fill the lower cover plate (2) under the action of the vibration platform. After filling, scrape off excess powder.

[0060] Step 4: Lay all the aluminum flat tubes (3) flat on the second support column in the lower cover (2). Each aluminum flat tube (3) is limited in position by the surrounding first support columns to prevent the aluminum flat tube (3) from sliding during vibration. When laying the aluminum flat tubes (3), pay attention to laying them flat to avoid uneven laying that may cause leakage in the uniform temperature plate welding.

[0061] Step 5: Fill the powder. The powder is filled around the aluminum flat tube (3). The height of the powder filling should be consistent with the height of the first support column. The vibration platform is turned on during filling. However, it should be noted that the vibration amplitude of the vibration platform should not be too large to prevent the aluminum flat tube (3) from popping out of the lower cover plate (2) due to excessive vibration.

[0062] Step 6: Use laser cutting to cut a plurality of circular through holes arranged in an array and of a size matching the first support column from the sintered wire mesh (5). After cutting, grind the edges of the openings of the circular through holes to avoid burrs caused by cutting, which may cause the sintered wire mesh (5) to be laid unevenly and unable to fit tightly with other parts, thereby hindering the circulation of the working medium inside the temperature-averaging plate. The polished sintered wire mesh (5) is laid in conjunction with the first support column of the lower cover plate (2). During laying, ensure that each circular through hole is matched with the first support column to avoid the first support column lifting the sintered wire mesh (5). The upper surface of the laid sintered wire mesh (5) is at the same height as the first support column and the outer frame of the groove in the lower cover plate (2).

[0063] Step 7: Punch holes in the vacuum brazing solder foil according to the welding process hole positions around the lower cover plate (2).

[0064] The diameter is the same as the welding process hole, and then the vacuum brazing solder foil with holes punched is laid flat on the sintered wire mesh (5), the first support column of the lower cover plate (2), and the groove outer frame, and the upper cover plate (1) is laid on the vacuum brazing solder foil. M3 bolts are used to pass through all the welding process holes of the upper cover plate (1), the vacuum brazing solder foil, and the lower cover plate (2) in sequence, and the other side of the bolts is locked with nuts.

[0065] Step 8. Assemble the temperature-averaging plate with bolts installed on the brazing fixture, clamp the upper cover plate (1) and the lower cover plate (2) on the temperature-averaging plate, and use a feeler gauge to measure the gap between the upper cover plate (1) and the lower cover plate (2). The gap should not exceed 0.08 mm. After measurement, send the temperature-averaging plate and the fixture into the brazing furnace for vacuum brazing.

[0066] Step 9, after brazing, prepare to weld the liquid filling tube (4). Before welding, use coarse sandpaper to lightly grind the outer surface of the welding position of the liquid filling tube to remove the surface oxide film to avoid the adverse effect of the surface oxide film on welding; use argon arc welding to weld the liquid filling tube (4) to the reserved hole of the temperature equalizing plate. During welding, insert a stainless steel wire into the liquid filling tube to avoid the liquid filling tube being blocked due to large back penetration of the welding.

[0067] Step 10: Fill the inner cavity of the temperature equalizer with liquid working fluid. The type of working fluid is selected according to the specific operating temperature of the product. Use vacuum filling equipment to vacuum fill the temperature equalizer. The specific principle is to first evacuate the inner cavity of the temperature equalizer to a negative pressure state, and then inject the liquid working fluid into the inner cavity of the temperature equalizer.

[0068] Step 11, plug the filling pipe (4), and seal the filling pipe of the temperature equalizing plate by resistance welding or stir friction welding. The plugging position is the root of the connection between the packaging process boss and the temperature equalizing plate. When plugging, it is necessary to plug from the upper cover plate (1), because the upper cover plate (1) is thinner than the lower cover plate (2) and is easy to plug. The width of the plugging weld should be at least 10 mm, and it should be distributed as evenly as possible on both sides of the root of the packaging process boss to ensure that the working fluid in the inner cavity of the temperature equalizing plate will not leak after the packaging process boss is removed, and there will be no unwelded gaps in the appearance after the packaging process boss is removed by machining.

[0069] Step 12: Use machining to remove the packaging process boss to complete the manufacture of the temperature equalization board.

[0070] It is understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and unless defined as here, will not be interpreted with idealized or overly formal meanings. The specific implementation methods described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Within the spirit and principle of the present invention, any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment of equivalent changes for application in other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the technical solution content of the present invention, any modification, equivalent replacement, improvement, etc., made according to the technical essence of the present invention, should be included in the protection scope of the present invention.

Claims

1. A temperature balancing plate with a liquid wick structure, characterized in that: It includes an upper cover plate, a lower cover plate, an aluminum flat tube, a liquid-filled tube, a sintered wire mesh, and sintered powder, wherein the liquid-filled tube is assembled and welded by argon arc welding after the brazing of the main body of the temperature equalizing plate is completed; a support column is provided in the groove of the lower cover plate, and the support column is divided into a first support column and a second support column, the height of the first support column is greater than the height of the second support column, the aluminum flat tube is laid on the second support column, and is limited by the first support column, and the surrounding and lower part of the aluminum flat tube are filled with powder, the powder is a mixture of aluminum powder and solder, and the sintered powder forms a shape matching the profile of the aluminum flat tube; the aluminum flat tube has a first hole running longitudinally and a transverse hole running transversely The second hole runs through, the first hole and the second hole are both distributed in an array, the first hole is used to collect the evaporated gas and transfer it to the second hole running through in the lateral direction, and the first hole transfers the evaporated gas to the sintered powder, condenses to form liquid, takes away the heat, and the second hole diffuses the heat to the entire temperature equalizing plate to achieve the purpose of temperature uniformity; the sintered wire mesh is laid flat on the aluminum flat tube, the upper cover plate is covered on the sintered wire mesh and is fixedly connected to the lower cover plate by bolts, the sintered wire mesh is provided with solder foil, and the upper cover plate, the lower cover plate, the aluminum flat tube, the sintered powder, and the sintered wire mesh are welded together at one time by vacuum brazing.

2. The temperature equalizing plate according to claim 1, characterized in that: The one-time welding is specifically the simultaneous welding of the lower cover plate, powder and aluminum flat tube, and the simultaneous welding of the upper cover plate, sintered wire mesh and lower cover plate.

3. The temperature equalizing plate according to claim 2, characterized in that: The upper cover plate and the lower cover plate are usually made of 6 series aluminum alloy material.

4. The temperature equalizing plate according to claim 3, characterized in that: The sintering powder is specifically aluminum powder, and the filling adopts a vibration filling method to make the powder filling compact.

5. The temperature equalizing plate according to claim 4, characterized in that: The aluminum flat tube is usually made of aluminum alloy material, and holes are punched in the thickness direction of the aluminum flat tube to allow hot steam to flow from the sintered powder to the aluminum flat tube, and then diffuse the hot steam through the transverse channel of the aluminum flat tube to achieve a uniform temperature effect.

6. The temperature equalizing plate according to claim 5, characterized in that: The liquid-filled tube is a 1060 aluminum alloy tube with a softer texture and thicker wall thickness; the sintered wire mesh is made of stainless steel and is sintered by sintering multiple layers of wire meshes with different mesh sizes.

7. The temperature equalizing plate according to claim 6, characterized in that: The liquid filling ports of the upper cover plate and the lower cover plate are both provided with packaging process bosses.

8. The temperature equalizing plate according to claim 7, characterized in that: The liquid filling pipe is welded by argon arc welding, and a stainless steel wire is inserted into the pipe during welding to avoid clogging of the liquid filling pipe.

9. The temperature equalizing plate according to claim 8, characterized in that: The diameter of the support column in the lower cover plate is 4 mm, and the spacing between the support columns is 8 mm; welding process holes with a diameter of 3.2 mm are reserved on the edges of the upper cover plate and the lower cover plate.

10. The method for manufacturing a temperature equalizing plate according to claim 9, characterized in that: The steps include: Step 1: Clean the parts and pickle the upper cover plate, lower cover plate and aluminum flat tube to remove the oxide film and other impurities on the surface of the parts and eliminate the influence of the oxide film and other impurities on the vacuum brazing. The pickling temperature is controlled between room temperature and 60°C. After pickling, put the parts into the drying oven for drying to prevent corrosion caused by residual moisture. Step 2: Machining the upper and lower cover plates. The support column in the lower cover plate is formed as one piece. Compared with the welded support column of the traditional temperature equalizer, it has higher strength and will not form welding defects. During machining, it should be noted that the height difference between the first support column and the second support column should be slightly smaller than the thickness of the aluminum flat tube to ensure that the aluminum flat tube can be tightly fitted with other parts during welding. When machining the reserved hole for the filling tube of the lower cover plate, the diameter of the reserved hole should be matched with the filling tube to ensure that the filling tube and the lower cover plate are tightly assembled. Step 3: Fill a layer of aluminum powder for sintering in the lower cover plate, the thickness of which is consistent with the height of the second support column, place the lower cover plate horizontally on the vibration platform, spread an excessive amount of aluminum powder in the groove of the lower cover plate, turn on the vibration platform, and allow the aluminum powder to fully fill the lower cover plate under the action of the vibration platform. After filling, scrape off the excess powder; Step 4: Lay all the aluminum flat tubes flat on the second support column in the lower cover plate. Each aluminum flat tube is limited in position by the surrounding first support column to prevent the aluminum flat tube from sliding during vibration. When laying the aluminum flat tubes, pay attention to laying them flat to avoid uneven laying that may cause leakage in the uniform temperature plate welding. Step 5: Fill the powder. The powder is filled around the aluminum flat tube. The height of the powder filling should be consistent with the height of the first support column. Turn on the vibration platform during filling. However, it should be noted that the vibration amplitude of the vibration platform should not be too large to prevent the aluminum flat tube from popping out of the lower cover due to excessive vibration. Step 6. Use laser cutting to cut a plurality of circular through holes arranged in an array and of a size matching the first support column from the sintered wire mesh. After cutting, grind the edges of the openings of the circular through holes to avoid burrs caused by cutting that make the sintered wire mesh unevenly laid and unable to fit closely with other parts, thereby hindering the circulation of the working medium inside the temperature-averaging plate. Lay the polished sintered wire mesh in conjunction with the first support column of the lower cover plate. During laying, ensure that each circular through hole is matched with the first support column to avoid the situation where the first support column lifts up the sintered wire mesh. The upper surface of the laid sintered wire mesh is at the same height as the first support column and the outer frame of the groove in the lower cover plate. Step 7: Punch holes in the vacuum brazing solder foil according to the welding process holes around the lower cover plate, with the same diameter as the welding process holes. Then lay the punched vacuum brazing solder foil flat on the sintered wire mesh, the first support column of the lower cover plate, and the outer frame of the groove. Lay the upper cover plate on the vacuum brazing solder foil, use M3 bolts to pass through all the welding process holes of the upper cover plate, vacuum brazing solder foil, and lower cover plate in sequence, and tighten the other side of the bolt with a nut. Step 8. Assemble the temperature-averaging plate with bolts installed on the brazing fixture, clamp the upper and lower covers of the temperature-averaging plate, and use a feeler gauge to measure the gap between the upper and lower covers. The gap should not exceed 0.08mm. After measurement, send the temperature-averaging plate and the fixture together into the brazing furnace for vacuum brazing. Step 9. After brazing, prepare to weld the liquid filling pipe. Before welding, use coarse sandpaper to lightly grind the outer surface of the welding position of the liquid filling pipe to remove the surface oxide film to avoid the adverse effect of the surface oxide film on welding. Use argon arc welding to weld the liquid filling pipe to the reserved hole of the temperature equalizing plate. During welding, insert stainless steel wire into the liquid filling pipe to avoid the liquid filling pipe being blocked due to large back penetration of welding. Step 10: Fill the inner cavity of the temperature equalizer with liquid working fluid. The type of working fluid is selected according to the specific use temperature of the product. Use vacuum filling equipment to vacuum fill the temperature equalizer. The specific principle is to first pump the inner cavity of the temperature equalizer to a negative pressure state, and then inject the liquid working fluid into the inner cavity of the temperature equalizer; Step 11: seal the filling pipe. The filling pipe of the temperature plate is sealed by resistance welding or friction stir welding. The sealing position is the root of the connection between the packaging process boss and the temperature plate. The sealing should be performed from the upper cover plate because the upper cover plate is thinner than the lower cover plate and is easy to seal. The width of the sealing weld should be at least 10 mm and should be evenly distributed on both sides of the root of the packaging process boss as much as possible to ensure that the working fluid in the cavity of the temperature plate will not leak after the packaging process boss is removed, and there will be no unwelded gap in the appearance after the packaging process boss is removed by machining; Step 12: Use machining to remove the packaging process boss to complete the manufacture of the temperature equalization board.

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