Three-dimensional gradient pore wick vapor chamber and processing method thereof

Abstract

The invention relates to the technical field of temperature uniformizing plates, in particular to a three-dimensional gradient pore wick temperature uniformizing plate and a processing method thereof.The three-dimensional gradient pore wick temperature uniformizing plate comprises an upper plate, a bottom plate is arranged on the lower side of the upper plate, a mounting groove is formed in the upper end of the bottom plate, a composite liquid suction mechanism is clamped between the upper plate and the mounting groove, and a positioning ring is fixedly connected to the lower end of the upper plate; the positioning ring is clamped in the positioning groove, the positioning groove is formed in the upper end of the bottom plate, a liquid inlet is formed in the upper end of the bottom plate, and one end of the liquid inlet is communicated with the mounting groove; through the arrangement of the composite liquid absorption mechanism, evaporation and backflow of liquid are completed, the heat dissipation effect is achieved, meanwhile, through the arrangement of potassium silicate and sodium silicate, when the upper copper net or the lower copper net is broken, potassium silicate and sodium silicate flow out and are mixed together, the liquid position of the upper copper net or the lower copper net is repaired and cured, and the heat dissipation effect is improved. And the situation that the heat transfer function and the liquid return function are reduced after the copper net is broken is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature averaging plates, in particular to a three-dimensional gradient pore liquid-absorbing core temperature averaging plate and a processing method thereof. Background Art

[0002] For example, the Chinese patent with announcement number CN105716461A discloses a temperature averaging plate with a planar gradient porous capillary core and a manufacturing method. The temperature averaging plate includes a second plate for absorbing a heat source and a first plate for dissipating heat. A first gradient porous capillary core is installed on the first plate, and a second gradient porous capillary core is installed on the second plate. The first gradient porous capillary core and the second gradient porous capillary core are fixedly connected. A cavity is provided on the side of the second gradient porous capillary core facing the first gradient porous capillary core, and a filling tube connected to the cavity is provided on the side of the second gradient porous capillary core.

[0003] However, the above solution has the following shortcomings: the above patent uses the capillary force and liquid return effect generated by the porous core with gradient pore size and porosity to achieve self-circulation. However, when the copper mesh in the temperature equalization plate develops microcracks due to high temperature or vibration, the liquid return function of the copper mesh will be reduced, resulting in a decrease in the heat dissipation efficiency of the temperature equalization plate. For this reason, we have introduced a three-dimensional gradient pore liquid-absorbing core temperature equalization plate and its processing method. Summary of the Invention

[0004] The object of the present invention is to provide a three-dimensional gradient pore liquid wick temperature equalizing plate and a processing method thereof, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A three-dimensional gradient pore liquid absorption core temperature equalizing plate comprises an upper plate, a bottom plate is provided on the lower side of the upper plate, a mounting groove is provided at the upper end of the bottom plate, a composite liquid absorption mechanism is clamped between the upper plate and the mounting groove, a positioning ring is fixedly connected to the lower end of the upper plate, the positioning ring is clamped in the positioning groove, the positioning groove is provided at the upper end of the bottom plate, a liquid inlet is provided at the upper end of the bottom plate, one end of the liquid inlet is connected to the mounting groove, and the other end is connected to the external environment.

[0007] Preferably, the composite liquid absorption mechanism comprises an upper copper mesh and a lower copper mesh, the upper copper mesh and the lower copper mesh are arranged between the upper plate and the mounting groove, and a three-dimensional gradient pore foam copper liquid absorption core is clamped between the upper copper mesh and the lower copper mesh.

[0008] Preferably, the upper ends of the upper copper mesh and the lower copper mesh are fixedly connected with a polyurethane coating, and the lower ends of the polyurethane coating are provided with several storage cavities. A diaphragm is fixedly connected in the storage cavity, and the storage cavity is divided into two chambers by the diaphragm. Potassium silicate and sodium silicate are respectively provided in the two chambers.

[0009] Preferably, a heat-conducting ring is provided on the upper side of the upper copper mesh, a plurality of corrugated plates are fixedly connected to the inner side of the heat-conducting ring, the upper ends of the corrugated plates are fixedly connected to the heat dissipation net, and the heat dissipation net is fixedly connected to the upper end of the heat-conducting ring.

[0010] Preferably, a plurality of card interfaces are provided on the outside of the heat-conducting ring, a plurality of heat-dissipating fins are fixedly connected to the outside of the upper plate, one end of the heat-dissipating fin extends into the external environment, and the other end extends into the inside of the upper plate, and the heat-dissipating fins are card-connected in the card interfaces.

[0011] Preferably, the end of the positioning ring away from the upper plate is fixedly connected to a liquid storage bag, in which high-temperature resistant glue is stored, and the lower end of the positioning groove is fixedly connected to a plurality of cone blocks.

[0012] Preferably, one end of the liquid inlet is fixedly connected to a U-shaped sealing ring, and the lower end of the upper plate is fixedly connected to a sealing block.

[0013] In addition, in order to achieve the above-mentioned object, the present invention also provides a method for processing a temperature-averaging plate, which is used for the above-mentioned three-dimensional gradient pore wick temperature-averaging plate, comprising:

[0014] S1. Use a machine tool to process the bottom plate and the upper plate to form the required dimensions. The bottom plate is provided with mounting slots for mounting the upper copper mesh, the lower copper mesh, and the three-dimensional gradient pore foam copper wick.

[0015] S2. Use laser cutting technology to precisely cut the foam copper, use 3D printing technology to process a mold for pressing the three-dimensional gradient pore copper foam wick, place the laser-cut copper foam into the mold, and press it with a hydraulic press to obtain a three-dimensional gradient pore copper foam wick, forming a continuous structure with decreasing porosity from the edge to the center of the evaporation end. The three-dimensional gradient pore wick is designed as a "fan-shaped spoke-like" structure. The copper mesh is cut into the shape of an upper copper mesh and a lower copper mesh. The size of the cut three-dimensional gradient pore copper foam wick matches the installation slot. The upper copper mesh and the lower copper mesh are cut into a sheet structure of the same size as the three-dimensional gradient pore copper foam wick;

[0016] S3, potassium silicate and sodium silicate are covered on the upper and lower copper meshes through a polyurethane coating, and the potassium silicate and sodium silicate are separated by a diaphragm, and the pressed three-dimensional gradient pore foam copper wick is sandwiched between the upper and lower copper meshes to form a composite liquid absorption mechanism, and the composite liquid absorption mechanism is assembled between the upper and lower copper meshes, and the heat conducting ring is connected to the plurality of heat dissipation fins. After the assembly is completed, the high temperature resistant glue in the liquid storage bag is bonded to the upper plate and the bottom plate;

[0017] S4. Deionized water is injected into the upper copper mesh and the lower copper mesh through the liquid inlet, and then the interior is vacuumed to reduce the internal air pressure. After the vacuuming is completed, the liquid inlet is punched to deform it.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention completes the evaporation and reflux of the liquid through the arrangement of the composite liquid absorption mechanism, thereby achieving a heat dissipation effect; at the same time, through the arrangement of potassium silicate and sodium silicate, when the upper copper mesh or the lower copper mesh is broken, the potassium silicate and the sodium silicate flow out and mix together, thereby repairing and solidifying the liquid on the upper copper mesh or the lower copper mesh, thereby preventing the occurrence of a situation in which the liquid return function of the copper mesh is reduced after it is broken. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the three-dimensional decomposition structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the connection between the copper mesh and the polyurethane coating of the present invention;

[0022] Figure 4 This is a schematic diagram of a three-dimensional cross-sectional structure of the connection relationship between the cone block and the positioning groove of the present invention;

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of the upper plate of the present invention;

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the connection between the heat-conducting ring and the heat dissipation network of the present invention;

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of the connection between the heat-conducting ring and the corrugated plate of the present invention;

[0026] Figure 8 This is a schematic diagram showing the decreasing porosity of the three-dimensional gradient pore copper foam wick material and the corrugated plate material of the present invention under a metallographic microscope.

[0027] In the figure: 1. Base plate; 2. Liquid inlet; 3. Positioning groove; 4. Lower copper mesh; 5. Three-dimensional gradient pore foam copper liquid wick; 6. Upper copper mesh; 7. Positioning ring; 8. Upper plate; 9. U-shaped sealing ring; 10. Conical block; 11. Mounting groove; 12. Polyurethane coating; 13. Storage cavity; 14. Sealing block; 15. Liquid storage bag; 16. Heat dissipation mesh; 17. Heat dissipation fins; 18. Thermal conductive ring; 19. Diaphragm; 20. Card interface; 21. Corrugated plate. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-8 , the present invention provides a technical solution:

[0030] Example 1:

[0031] A three-dimensional gradient pore liquid-absorbing core temperature equalizing plate comprises an upper plate 8, a bottom plate 1 is provided on the lower side of the upper plate 8, both the upper plate 8 and the bottom plate 1 are made of copper, a mounting groove 11 is provided at the upper end of the bottom plate 1, a composite liquid-absorbing mechanism is clamped between the upper plate 8 and the mounting groove 11, the composite liquid-absorbing mechanism optimizes the liquid reflux efficiency and enhances the capillary force, a positioning ring 7 is fixedly connected to the lower end of the upper plate 8, the positioning ring 7 is clamped in the positioning groove 3, and the positioning ring 7 is clamped in the positioning groove 3 to complete the rapid positioning and installation of the upper plate 8 and the bottom plate 1, the positioning groove 3 is provided at the upper end of the bottom plate 1, a liquid inlet 2 is provided at the upper end of the bottom plate 1, one end of the liquid inlet 2 is connected to the mounting groove 11, and the other end is connected to the external environment, deionized water is injected into the upper copper mesh 6 and the lower copper mesh 4 through the liquid inlet 2, and then the interior is vacuumed.

[0032] Example 2:

[0033] On the basis of Example 1, in order to enable the upper plate 8 and the bottom plate 1 to be quickly installed together, the composite liquid absorption mechanism includes an upper copper mesh 6 and a lower copper mesh 4, which are arranged between the upper plate 8 and the mounting groove 11, and a three-dimensional gradient pore foam copper liquid absorption core 5 is clamped between the upper copper mesh 6 and the lower copper mesh 4. The three-dimensional gradient pore liquid absorption core 5 is formed by a transverse gradient processing process to form a continuous structure with decreasing porosity from the edge to the center of the evaporation end. This structure can generate a gradually increasing capillary pressure gradient during the working medium reflux process, significantly improving the directional synergistic effect of the capillary driving force. By using the three-dimensional gradient pore foam metal as the liquid absorption core material, the heat conduction efficiency of the heat spreader is significantly improved compared with the traditional heat spreader;

[0034] The three-dimensional gradient pore wick 5 is designed as a "fan-shaped spoke" structure. This design is based on the working principle of the heat spreader. By optimizing the return path of the liquid working medium, it guides it to return to the heat source evaporation end more efficiently, thereby significantly improving the heat conduction performance of the heat spreader. At the same time, the gaps between the fan-shaped spokes act as airways for the steam inside the heat spreader.

[0035] The high capillary force characteristics of the upper copper mesh 6 and the lower copper mesh 4 play an important role in the working medium reflux process. On the upper plate 8, the upper copper mesh 6 can effectively assist the condensation and reflux of the working medium, so that the working medium can return to the heat source evaporation end more smoothly. On the bottom plate 1, the high capillary force of the lower copper mesh 4 can make the liquid reflux the working medium. A cavity is formed between the three-dimensional gradient pore foam copper wick 5 and the upper copper mesh 6 and the lower copper mesh 4 to ensure that the working medium can evaporate at a lower temperature and circulate quickly. The liquid is converted into steam and moves upward by absorbing heat through the bottom plate 1. When the steam enters the upper side, the steam is cooled by the upper plate 8 and the upper copper mesh 6 to condense. The condensed water flows back to the lower copper mesh 4 through the upper copper mesh 6 and the three-dimensional gradient pore foam copper wick 5;

[0036] The upper ends of the upper copper mesh 6 and the lower copper mesh 4 are fixedly connected with a polyurethane coating 12. The polyurethane is a high-temperature resistant material. The lower end of the polyurethane coating 12 is provided with a plurality of storage chambers 13. The storage chamber 13 is fixedly connected with a diaphragm 19. The storage chamber 13 is divided into two chambers by the diaphragm 19. Potassium silicate and sodium silicate are respectively provided in the two chambers. Potassium silicate and sodium silicate are both liquid. Both potassium silicate and sodium silicate are tightly attached to the upper copper mesh 6 or the lower copper mesh 4. In the process of heat dissipation of the temperature plate, the temperature in the temperature plate will reduce the viscosity of potassium silicate and sodium silicate, thereby improving the viscosity of the two. The fluidity of the upper copper mesh 6 or the lower copper mesh 4 is improved, and the temperature in the temperature uniformity plate will also accelerate the reaction speed of potassium silicate and sodium silicate, quickly repairing the cracks. After the potassium silicate and sodium silicate are mixed, they react at a temperature of 25°C for 10-30 minutes to change from liquid to solid, thereby achieving solidification and repairing of the cracks on the upper copper mesh 6 or the lower copper mesh 4, solving the problem of decreased liquid return function after the copper mesh is broken. When a crack appears at a certain position of the upper copper mesh 6 or the lower copper mesh 4, the potassium silicate solution and the sodium silicate solution at that position will mix together, penetrate the crack and solidify to repair the crack;

[0037] Vapor chambers are mostly used in smartphones, server CPUs, graphics cards GPUs, and automotive IGBT modules. Potassium silicate and sodium silicate only become less effective when the temperature is above 100°C for a long time. Therefore, during the use of the vapor chamber, the temperature inside the vapor chamber will not affect the potassium silicate and sodium silicate.

[0038] A heat-conducting ring 18 is provided on the upper side of the upper copper mesh 6. The material of the heat-conducting ring 18 is made of copper with good thermal conductivity. A number of corrugated plates 21 are fixedly connected to the inside of the heat-conducting ring 18. The material of the corrugated plates 21 is porous foam copper. The upper end of the corrugated plate 21 is fixedly connected to the heat dissipation net 16. The heat dissipation net 16 is fixedly connected to the upper end of the heat-conducting ring 18. A number of card interfaces 20 are provided on the outside of the heat-conducting ring 18. A number of heat dissipating fins 17 are fixedly connected to the outside of the upper plate 8. One end of the heat dissipating fin 17 extends into the external environment, and the other end extends into the inside of the upper plate 8. The heat dissipating fin 17 is carded in the card interface 20 to conduct heat. The ring 18 is arranged on the upper side of the upper copper mesh 6, and the card interface 20 opened on the outer side of the heat-conducting ring 18 is clamped together with the heat-dissipating fins 17. When the temperature is high and more steam appears, the gas will absorb heat when entering between the several corrugated plates 21. The absorbed heat is conducted to the heat-dissipating fins 17 through the heat-conducting ring 18. The heat-dissipating fins 17 dissipate the heat to the external environment. The heat dissipation net 16 can further dissipate the steam and condense it. The condensed liquid is guided to the corrugated plates 21 through the heat-dissipating net 16, and then enters the three-dimensional gradient pore foam copper liquid-absorbing core 5 from the corrugated plates 21.

[0039] The end of the positioning ring 7 away from the upper plate 8 is fixedly connected to a liquid storage bag 15, and high-temperature resistant glue is stored in the liquid storage bag 15. A plurality of cone blocks 10 are fixedly connected to the lower end of the positioning groove 3. When the positioning ring 7 is snapped into the positioning groove 3, the plurality of cone blocks 10 will puncture the liquid storage bag 15. After the high-temperature resistant glue in the liquid storage bag 15 flows out, the connection between the positioning ring 7 and the positioning groove 3 is sealed, so that the upper plate 8 and the bottom plate 1 are fixed together;

[0040] A U-shaped sealing ring 9 is fixedly connected to one end of the liquid inlet 2, and a sealing block 14 is fixedly connected to the lower end of the upper plate 8. When the upper plate 8 and the bottom plate 1 are snapped together, the sealing block 14 will contact the U-shaped sealing ring 9 to form a complete sealing ring. Through the setting of the sealing ring, when deionized water is injected into the liquid inlet 2 and vacuumed, the liquid will not flow out, thereby improving the efficiency of vacuuming.

[0041] In addition, in order to achieve the above-mentioned purpose, the present invention also provides a method for processing a temperature-averaging plate, which is used for the above-mentioned three-dimensional gradient pore wick temperature-averaging plate, comprising:

[0042] S1. Use a machine tool to process the bottom plate 1 and the upper plate 8 to form the required dimensions. The bottom plate 1 is provided with a mounting groove 11 for mounting the upper copper mesh 6, the lower copper mesh 4 and the three-dimensional gradient pore foam copper wick 5;

[0043] S2. Use laser cutting technology to precisely cut the foam copper, use 3D printing technology to process a mold for pressing the three-dimensional gradient pore foam copper wick 5, place the laser-cut foam copper into the mold, and press it with a hydraulic press to obtain the three-dimensional gradient pore foam copper wick 5, forming a continuous structure with decreasing porosity from the edge to the center of the evaporation end, cut the copper mesh into the shape of the upper copper 6 and the lower copper mesh 4, and the size of the three-dimensional gradient pore foam copper wick 5 after cutting matches the installation groove 11, and cut the upper copper mesh 6 and the lower copper mesh 4 into a sheet structure of the same size as the three-dimensional gradient pore foam copper wick 5;

[0044] S3, potassium silicate and sodium silicate are covered on the upper ends of the upper copper mesh 6 and the lower copper mesh 4 through a polyurethane coating 12, and the potassium silicate and sodium silicate are separated by a diaphragm 19. The pressed three-dimensional gradient pore foam copper wick 5 is sandwiched between the upper copper mesh 6 and the lower copper mesh 4 to form a composite liquid absorption mechanism, which is assembled between the upper copper mesh 6 and the lower copper mesh 4. The heat conducting ring 18 is connected to the plurality of heat dissipating fins 17. After the assembly is completed, the high temperature resistant glue in the liquid storage bag 15 is bonded to the upper plate 8 and the bottom plate 1;

[0045] S4. Deionized water is injected into the upper copper mesh 6 and the lower copper mesh 4 through the liquid inlet 2. The interior is then vacuumed to reduce the internal pressure. After the vacuuming is completed, the liquid inlet 2 is punched to deform it.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A three-dimensional gradient pore wick temperature plate, comprising an upper plate, characterized in that: A bottom plate is provided on the lower side of the upper plate, a mounting groove is provided at the upper end of the bottom plate, a composite liquid suction mechanism is clamped between the upper plate and the mounting groove, a positioning ring is fixedly connected to the lower end of the upper plate, the positioning ring is clamped in the positioning groove, the positioning groove is provided at the upper end of the bottom plate, a liquid inlet is provided at the upper end of the bottom plate, one end of the liquid inlet is connected to the mounting groove, and the other end is connected to the external environment.

2. The three-dimensional gradient pore wick temperature equalizing plate according to claim 1, characterized in that: The composite liquid absorption mechanism comprises an upper copper mesh and a lower copper mesh, wherein the upper copper mesh and the lower copper mesh are arranged between the upper plate and the mounting groove, and a three-dimensional gradient pore foam copper liquid absorption core is clamped between the upper copper mesh and the lower copper mesh.

3. The three-dimensional gradient pore wick temperature equalizing plate according to claim 2, characterized in that: The upper ends of the upper copper mesh and the lower copper mesh are fixedly connected with a polyurethane coating, and the lower ends of the polyurethane coating are provided with a plurality of storage cavities. A diaphragm is fixedly connected in the storage cavity, and the storage cavity is divided into two chambers by the diaphragm. Potassium silicate and sodium silicate are respectively provided in the two chambers.

4. The three-dimensional gradient pore wick temperature equalizing plate according to claim 2, characterized in that: A heat-conducting ring is provided on the upper side of the upper copper mesh, a plurality of corrugated plates are fixedly connected to the inner side of the heat-conducting ring, the upper ends of the corrugated plates are fixedly connected to the heat dissipation mesh, and the heat dissipation mesh is fixedly connected to the upper end of the heat-conducting ring.

5. The three-dimensional gradient pore wick temperature equalizing plate according to claim 4, characterized in that: The outer side of the heat-conducting ring is provided with a plurality of card interfaces, the outer side of the upper plate is fixedly connected with a plurality of heat dissipating fins, one end of the heat dissipating fin extends into the external environment, and the other end extends into the inner side of the upper plate, and the heat dissipating fins are clamped in the card interfaces.

6. The three-dimensional gradient pore wick temperature equalizing plate according to claim 1, characterized in that: The end of the positioning ring away from the upper plate is fixedly connected to a liquid storage bag, in which high-temperature resistant glue is stored. The lower end of the positioning groove is fixedly connected to a plurality of cone blocks.

7. The three-dimensional gradient pore wick temperature equalizing plate according to claim 1, characterized in that: One end of the liquid inlet is fixedly connected with a U-shaped sealing ring, and the lower end of the upper plate is fixedly connected with a sealing block.

8. A method for processing a temperature evaporating plate, used for the three-dimensional gradient pore wick temperature evaporating plate according to any one of claims 1 to 7, characterized in that: include: S1. Use a machine tool to process the bottom plate and the upper plate to form the required dimensions. The bottom plate is provided with mounting grooves for mounting the upper copper mesh, the lower copper mesh, and the three-dimensional gradient pore foam copper wick. S2. Use laser cutting technology to precisely cut the copper foam, use 3D printing technology to process a mold for pressing the three-dimensional gradient pore copper foam wick, place the laser-cut copper foam into the mold, and press it with a hydraulic press to obtain a three-dimensional gradient pore copper foam wick, forming a continuous structure with decreasing porosity from the edge to the center of the evaporation end. The three-dimensional gradient pore wick is designed as a "fan-shaped spoke" structure. The copper mesh is cut into the shape of an upper copper mesh and a lower copper mesh. The size of the cut three-dimensional gradient pore copper foam wick matches the installation slot. The upper and lower copper meshes are cut into sheet structures of the same size as the three-dimensional gradient pore copper foam wick; S3, potassium silicate and sodium silicate are covered on the upper and lower copper meshes through a polyurethane coating, the potassium silicate solution and the sodium silicate solution are separated by a diaphragm, the pressed three-dimensional gradient pore foam copper wick is sandwiched between the upper and lower copper meshes to form a composite liquid absorption mechanism, the composite liquid absorption mechanism is assembled between the upper and lower copper meshes, the heat conducting ring is connected to a plurality of heat dissipating fins, and after the assembly is completed, the high temperature resistant glue in the liquid storage bag is bonded to the upper plate and the bottom plate; S4. Deionized water is injected into the upper copper mesh and the lower copper mesh through the liquid inlet, and then the interior is vacuumed to reduce the internal air pressure. After the vacuuming is completed, the liquid inlet is punched to deform it.

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