A three-dimensional gradient-pore wick uniform temperature plate and a processing method thereof

Abstract

The application relates to the technical field of uniform temperature plates, in particular to a three-dimensional gradient-pore wick uniform temperature plate and a processing method thereof, which comprises an upper plate, the lower side of the upper plate is provided with a bottom plate, the upper end of the bottom plate is provided with a mounting groove, a composite liquid suction mechanism is clamped between the upper plate and the mounting groove, the lower end of the upper plate is fixedly connected with a positioning ring, the positioning ring is clamped in a positioning groove, the positioning groove is arranged on the upper end of the bottom plate, the upper end of the bottom plate is provided with a liquid inlet, and one end of the liquid inlet is in communication with the mounting groove. Through the arrangement of the composite liquid suction mechanism, the evaporation and reflux of liquid are completed, the heat dissipation effect is achieved, and 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, the liquid at the upper copper mesh or the lower copper mesh is repaired and solidified, and the occurrence of the heat transfer and the decrease of the liquid reflux function after the copper mesh is broken is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of uniform temperature plate, in particular to a three-dimensional gradient porosity wick uniform temperature plate and a processing method thereof. BACKGROUND

[0002] For example, a Chinese patent with publication number CN105716461A discloses a uniform temperature plate with a planar direction gradient porous capillary wick and a manufacturing method. The uniform temperature plate includes a second plate material for absorbing a heat source and a first plate material for heat dissipation. The first plate material is provided with a first gradient porous capillary wick, and the second plate material is provided with a second gradient porous capillary wick. The first gradient porous capillary wick is fixedly connected with the second gradient porous capillary wick. The side of the second gradient porous capillary wick facing the first gradient porous capillary wick is provided with a cavity, and the side surface of the second gradient porous capillary wick is provided with a filling pipe in communication with the cavity.

[0003] However, the above-mentioned scheme has the following disadvantages: the capillary force backflow effect of the porous wick with gradient pore size and porosity in the above-mentioned patent realizes self-circulation. However, when the copper mesh in the uniform temperature plate has micro-cracks due to high temperature or vibration, the backflow function of the copper mesh will decrease, resulting in a decrease in the heat dissipation efficiency of the uniform temperature plate. Therefore, a three-dimensional gradient porosity wick uniform temperature plate and a processing method thereof are provided. SUMMARY

[0004] The present application aims to provide a three-dimensional gradient porosity wick uniform temperature plate and a processing method thereof to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A three-dimensional gradient porosity wick uniform temperature plate includes an upper plate, a bottom plate provided on the lower side of the upper plate, an installation groove provided on the upper end of the bottom plate, a composite wicking mechanism clamped between the upper plate and the installation groove, a positioning ring fixedly connected to the lower end of the upper plate, a positioning groove in which the positioning ring is clamped, and a liquid inlet provided on the upper end of the bottom plate and in communication with the installation groove.

[0007] Preferably, the composite wicking mechanism includes 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 installation groove, and a three-dimensional gradient porosity foam copper wick is clamped between the upper copper mesh and the lower copper mesh.

[0008] Preferably, a polyurethane coating is fixedly connected to the upper end of each of the upper copper mesh and the lower copper mesh, a plurality of storage cavities are provided on the lower end of the polyurethane coating, a diaphragm is fixedly connected to each of the storage cavities, the storage cavities are divided into two chambers by the diaphragm, and potassium silicate and sodium silicate are arranged in the two chambers, respectively.

[0009] Preferably, the upper copper mesh is provided with a heat-conducting ring on the upper side, 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 with a heat-dissipating mesh, and the heat-dissipating mesh is fixedly connected to the upper end of the heat-conducting ring.

[0010] Preferably, a plurality of clamping interfaces are formed on the outer side of the heat-conducting ring, a plurality of heat-dissipating fins are fixedly connected to the outer side of the upper plate, one end of each heat-dissipating fin extends into the external environment, the other end extends into the inner side of the upper plate, and the heat-dissipating fins are clamped in the clamping interfaces.

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

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

[0013] In addition, in order to achieve the above-mentioned purpose, the application also provides a uniform temperature plate processing method for the three-dimensional gradient pore liquid wick uniform temperature plate, comprising:

[0014] S1, using a machine tool to process the bottom plate and the upper plate to form the required outer dimensions, and forming an installation groove on the bottom plate for installing the upper copper mesh, the lower copper mesh and the three-dimensional gradient pore foam copper liquid wick;

[0015] S2, using laser cutting technology to accurately cut the foam copper, using 3D printing technology to process a mold for pressing the three-dimensional gradient pore foam copper liquid wick, placing the laser-cut foam copper in the mold, and pressing it by a hydraulic press to obtain the three-dimensional gradient pore foam copper liquid wick, forming a continuous structure with decreasing porosity from the edge to the center of the evaporation end, and designing the three-dimensional gradient pore liquid wick as a "fan spoke" structure, cutting the copper mesh into the shape of the upper copper mesh and the lower copper mesh, and cutting the three-dimensional gradient pore foam copper liquid wick to match the installation groove in size, and cutting the upper copper mesh and the lower copper mesh into a sheet structure with the same size as the three-dimensional gradient pore foam copper liquid wick;

[0016] S3, covering potassium silicate and sodium silicate on the upper ends of the upper copper mesh and the lower copper mesh through a polyurethane coating, separating the potassium silicate and the sodium silicate by a diaphragm, clamping the pressed three-dimensional gradient pore foam copper liquid wick between the upper copper mesh and the lower copper mesh to form a composite liquid wick mechanism, assembling the composite liquid wick mechanism between the upper copper mesh and the lower copper mesh, connecting the heat-conducting ring with the plurality of heat-dissipating fins, and bonding the upper plate and the bottom plate with the high-temperature-resistant glue in the liquid storage bag after the assembly is completed.

[0017] S4, through the liquid inlet inject deionized water to the inside of the upper copper net and the lower copper net, then carry out vacuumizing treatment to the inside, make the internal air pressure reduce, after vacuumizing, stamp the liquid inlet to make it deform.

[0018] Compared with the prior art, the beneficial effects of the present application are: through the setting of the composite liquid absorption mechanism, the present application completes the evaporation and reflux of the liquid, achieves the heat dissipation effect, and through the setting of potassium silicate and sodium silicate, when the upper copper net or the lower copper net breaks, the potassium silicate and the sodium silicate flow out and mix together to repair and solidify the liquid at the upper copper net or the lower copper net, preventing the liquid return function of the copper net from decreasing after breaking. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0021] Figure 3 It is a three-dimensional structure schematic diagram of the connection relationship between the lower copper net and the polyurethane coating of the present application;

[0022] Figure 4 It is a three-dimensional sectional structure schematic diagram of the connection relationship between the taper block and the positioning groove of the present application;

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

[0024] Figure 6 It is a three-dimensional structure schematic diagram of the connection relationship between the heat conduction ring and the heat dissipation net of the present application;

[0025] Figure 7 It is a three-dimensional structure schematic diagram of the connection relationship between the heat conduction ring and the corrugated plate of the present application;

[0026] Figure 8 It is a schematic diagram of the porosity reduction of the three-dimensional gradient porosity foam copper liquid absorption core material and the corrugated plate material under the metallographic microscope.

[0027] In the figure: 1, bottom plate; 2, liquid inlet; 3, positioning groove; 4, lower copper net; 5, three-dimensional gradient porosity foam copper liquid absorption core; 6, upper copper net; 7, positioning ring; 8, upper plate; 9, U-shaped sealing ring; 10, taper block; 11, mounting groove; 12, polyurethane coating; 13, storage cavity; 14, sealing block; 15, liquid storage bag; 16, heat dissipation net; 17, heat dissipation fin; 18, heat conduction ring; 19, diaphragm; 20, clamping port; 21, corrugated plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0029] Please refer to Figures 1-8 The present application provides a technical solution:

[0030] Embodiment 1:

[0031] A three-dimensional gradient porous wick uniform temperature plate, comprising an upper plate 8, a bottom plate 1 arranged on the lower side of the upper plate 8, the upper plate 8 and the bottom plate 1 are both made of copper, an installation groove 11 is arranged on the upper end of the bottom plate 1, a composite liquid absorption mechanism is clamped between the upper plate 8 and the installation groove 11, the liquid return efficiency is optimized and the capillary force is enhanced through the composite liquid absorption mechanism, a positioning ring 7 is fixedly connected to the lower end of the upper plate 8, the positioning ring 7 is clamped in a positioning groove 3, 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 arranged on the upper end of the bottom plate 1, a liquid inlet 2 is arranged on the upper end of the bottom plate 1, one end of the liquid inlet 2 is in communication with the installation groove 11, and the other end is in communication with 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 inside is subjected to vacuumizing treatment.

[0032] Embodiment 2:

[0033] On the basis of embodiment 1, in order to enable the upper plate 8 and the bottom plate 1 to be rapidly installed together, the composite liquid absorption mechanism comprises an upper copper mesh 6 and a lower copper mesh 4, the upper copper mesh 6 and the lower copper mesh 4 are arranged between the upper plate 8 and the installation groove 11, and a three-dimensional gradient porous copper foam wick 5 is clamped between the upper copper mesh 6 and the lower copper mesh 4, the three-dimensional gradient porous wick 5 is formed through a transverse gradient processing technology, and has a continuous structure with a 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 return process, significantly improving the directional synergistic effect of the capillary driving force. By using three-dimensional gradient porous foam metal as the wick material, the heat conduction efficiency of the uniform temperature plate is significantly improved compared with traditional uniform temperature plates.

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

[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 returns to the evaporation end of the heat source more smoothly. On the bottom plate 1, the high capillary force of the lower copper mesh 4 can make the liquid reflux. The three-dimensional gradient porous foam copper wick 5, the upper copper mesh 6 and the lower copper mesh 4 form a cavity, which ensures that the working medium can evaporate at a lower temperature and circulate quickly. The liquid is turned into steam by the bottom plate 1, and the steam moves upward. When the steam enters the upper side, the upper plate 8 and the upper copper mesh 6 cool the steam to make it condense. The condensed water flows back to the lower copper mesh 4 through the upper copper mesh 6 and the three-dimensional gradient porous foam copper wick 5;

[0036] The upper end of the upper copper mesh 6 and the lower copper mesh 4 is 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 cavities 13. The storage cavities 13 are fixedly connected with diaphragms 19. The storage cavities 13 are divided into two chambers by the diaphragms 19. Potassium silicate and sodium silicate are arranged in the two chambers respectively. The potassium silicate and the sodium silicate are in liquid state. The potassium silicate and the sodium silicate are closely combined with the upper copper mesh 6 or the lower copper mesh 4. During the heat dissipation process of the uniform temperature plate, the temperature in the uniform temperature plate reduces the viscosity of the potassium silicate and the sodium silicate, and improves the fluidity of the potassium silicate and the sodium silicate. At the same time, the temperature in the uniform temperature plate also accelerates the reaction speed of the potassium silicate and the sodium silicate, quickly repairs the cracks. After mixing, the potassium silicate and the sodium silicate can change from liquid state to solid state in 10-30 minutes at a temperature of 25℃, realizing the solidification and repair of the cracks of the upper copper mesh 6 or the lower copper mesh 4, solving the problem of the decrease of the liquid return function after the copper mesh is broken. When the upper copper mesh 6 or the lower copper mesh 4 has a crack at a position, the potassium silicate solution and the sodium silicate solution at the position will mix together and penetrate the crack to repair the crack after solidification;

[0037] Since the uniform temperature plate is mostly used in smart phones, server CPUs, graphics cards GPUs and vehicle IGBT modules, the potassium silicate and the sodium silicate will gradually decrease in use effect only when the temperature is above 100℃ for a long time. Therefore, the temperature in the uniform temperature plate does not affect the potassium silicate and the sodium silicate during the use of the uniform temperature plate;

[0038] The upper copper net 6 is provided with a heat conduction ring 18 on the upper side, the heat conduction ring 18 is made of copper with good heat conduction effect, a plurality of corrugated plates 21 are fixedly connected to the inner side of the heat conduction ring 18, the corrugated plates 21 are made of porous foam copper, the upper ends of the corrugated plates 21 are fixedly connected with the heat dissipation net 16, the heat dissipation net 16 is fixedly connected to the upper end of the heat conduction ring 18, a plurality of clamping interfaces 20 are formed on the outer side of the heat conduction ring 18, a plurality of heat dissipation fins 17 are fixedly connected to the outer side of the upper plate 8, one end of the heat dissipation fin 17 extends into the external environment, and the other end extends into the inner side of the upper plate 8, the heat dissipation fin 17 is clamped in the clamping interface 20, the heat conduction ring 18 is arranged on the upper side of the upper copper net 6, and the clamping interface 20 formed on the outer side of the heat conduction ring 18 and the heat dissipation fin 17 are clamped together, when the temperature is relatively high and a large amount of steam is generated, the gas is absorbed when entering between the plurality of corrugated plates 21, the absorbed heat is conducted to the heat dissipation fin 17 through the heat conduction ring 18, the heat dissipation fin 17 dissipates heat to the external environment, the steam can be further heat-dissipated and condensed through the heat dissipation net 16, and the condensed liquid is guided to the corrugated plate 21 through the heat dissipation net 16 and then enters the three-dimensional gradient porous foam copper liquid absorption core 5 through the corrugated plate 21;

[0039] The positioning ring 7 is fixedly connected with a liquid storage bag 15 away from one end of the upper plate 8, the liquid storage bag 15 stores high-temperature-resistant glue, and a plurality of taper blocks 10 are fixedly connected to the lower end of the positioning groove 3, so that the liquid storage bag 15 is pierced when the positioning ring 7 is clamped into the positioning groove 3, the high-temperature-resistant glue in the liquid storage bag 15 flows out to seal the connection between the positioning ring 7 and the positioning groove 3, so that the upper plate 8 and the bottom plate 1 are fixed together.

[0040] The U-shaped sealing ring 9 is fixedly connected to one end of the liquid inlet 2, and the sealing block 14 is fixedly connected to the lower end of the upper plate 8, so that the sealing block 14 is in contact with the U-shaped sealing ring 9 when the upper plate 8 and the bottom plate 1 are clamped together, forming a complete sealing ring, the liquid does not flow out when deionized water is injected into the liquid inlet 2 and vacuumized, and the efficiency of vacuumizing is improved.

[0041] In addition, in order to achieve the above-mentioned purpose, the application also provides a processing method of the uniform temperature plate, which is used for the three-dimensional gradient porous liquid absorption core uniform temperature plate, and comprises the following steps:

[0042] S1, using a machine tool to process the bottom plate 1 and the upper plate 8 to form the required size, the bottom plate 1 is provided with a mounting groove 11 for mounting the upper copper net 6, the lower copper net 4 and the three-dimensional gradient porous foam copper liquid absorption core 5;

[0043] S2, the foam copper is precisely cut using a laser cutting technology, a mold for pressing the three-dimensional gradient porous foam copper liquid absorbing core 5 is processed using a 3D printing technology, the laser-cut foam copper is placed in the mold, and the three-dimensional gradient porous foam copper liquid absorbing core 5 is obtained by pressing through a hydraulic press, a continuous structure with a decreasing porosity from the edge to the center of the evaporation end is formed, the copper mesh is cut and processed into the shape of the upper copper 6 and the lower copper mesh 4, the size of the three-dimensional gradient porous foam copper liquid absorbing core 5 after cutting matches the installation groove 11, the upper copper mesh 6 and the lower copper mesh 4 are cut into a sheet structure with the same size as the three-dimensional gradient porous foam copper liquid absorbing core 5;

[0044] S3, the potassium silicate and the sodium silicate are covered on the upper end of the upper copper mesh 6 and the lower copper mesh 4 through the polyurethane coating 12, the potassium silicate and the sodium silicate are separated by the diaphragm 19, the pressed three-dimensional gradient porous foam copper liquid absorbing core 5 is clamped between the upper copper mesh 6 and the lower copper mesh 4, the composite liquid absorbing mechanism is formed, the composite liquid absorbing mechanism is assembled between the upper copper mesh 6 and the lower copper mesh 4, the heat-conducting ring 18 is connected with the plurality of heat dissipation fins 17, after the assembly is completed, the high-temperature-resistant glue in the liquid storage bag 15 is used to bond 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, then the inside is subjected to vacuumizing treatment, so that the internal air pressure is reduced, after the vacuumizing is completed, the liquid inlet 2 is subjected to stamping so that it is deformed.

[0046] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A three-dimensional gradient pore liquid absorption core temperature equalizer, comprising an upper plate, characterized in that: The upper plate is provided with a bottom plate on its lower side. The bottom plate has an installation groove at its upper end. A composite liquid suction mechanism is clamped between the upper plate and the installation groove. A positioning ring is fixedly connected to the lower end of the upper plate. The positioning ring is engaged in the positioning groove. The positioning groove is located at the upper end of the bottom plate. The bottom plate has a liquid inlet at its upper end. One end of the liquid inlet is connected to the installation groove, and the other end is connected to the external environment. The composite liquid absorption mechanism includes an upper copper mesh and a lower copper mesh, which are disposed between the upper plate and the mounting groove. A three-dimensional gradient pore foam copper liquid absorption core is sandwiched between the upper copper mesh and the lower copper mesh. Both the upper and lower copper meshes are fixedly connected with a polyurethane coating at their upper ends. Several storage cavities are opened at the lower end of the polyurethane coating. A diaphragm is fixedly connected inside each storage cavity, dividing the storage cavity into two chambers. Potassium silicate and sodium silicate are respectively placed in the two chambers.

2. The three-dimensional gradient pore liquid absorption core temperature equalizer according to claim 1, characterized in that: A heat-conducting ring is provided on the upper side of the upper copper mesh, and several corrugated plates are fixedly connected to the inner side of the heat-conducting ring. The upper end of the corrugated plates is fixedly connected to the heat dissipation mesh, and the heat dissipation mesh is fixedly connected to the upper end of the heat-conducting ring.

3. The three-dimensional gradient pore liquid absorption core temperature equalizer according to claim 2, characterized in that: The outer side of the heat-conducting ring has several card slots, and the outer side of the upper plate is fixedly connected with several heat dissipation fins. One end of each heat dissipation fin extends into the external environment, and the other end extends into the inner side of the upper plate. The card slots are fitted with heat dissipation fins.

4. The three-dimensional gradient pore liquid absorption core temperature equalizer according to claim 3, characterized in that: A liquid storage bag is fixedly connected to the end of the positioning ring away from the upper plate. The liquid storage bag contains high-temperature resistant adhesive. Several cone blocks are fixedly connected to the lower end of the positioning groove.

5. A three-dimensional gradient pore liquid absorption core temperature equalizer according to claim 4, characterized in that: A U-shaped sealing ring is fixedly connected to one end of the liquid inlet, and a sealing block is fixedly connected to the lower end of the upper plate.

6. A method for processing a heat spreader, used in the three-dimensional gradient pore liquid-absorbing core heat spreader as described in claim 4 or 5, characterized in that, include: S1. Use a machine tool to process the base plate and the upper plate to form the required external dimensions. The base plate has an installation groove for installing the upper copper mesh, the lower copper mesh and the three-dimensional gradient pore foam copper liquid absorption core. S2. Laser cutting technology is used to precisely cut the foamed copper. 3D printing technology is used to process a mold for pressing the three-dimensional gradient porous foamed copper liquid-absorbing core. The laser-cut foamed copper is placed into the mold and pressed by a hydraulic press to obtain the three-dimensional gradient porous foamed copper liquid-absorbing core, forming a continuous structure with decreasing porosity from the edge to the center of the evaporation end. The three-dimensional gradient porous liquid-absorbing core is designed as a "fan-shaped spoke structure". The copper mesh is cut and processed into the shape of an upper copper mesh and a lower copper mesh. After cutting, the size of the three-dimensional gradient porous foamed copper liquid-absorbing core matches the installation groove. The upper and lower copper meshes are cut into sheet-like structures with the same size as the three-dimensional gradient porous foamed copper liquid-absorbing core. S3. Potassium silicate and sodium silicate are coated with polyurethane coating on the upper and lower copper meshes. The potassium silicate solution and sodium silicate solution are separated by a diaphragm. The pressed three-dimensional gradient porous foam copper liquid-absorbing core is sandwiched between the upper and lower copper meshes to form a composite liquid-absorbing mechanism. The composite liquid-absorbing mechanism is assembled between the upper plate and the mounting groove. The heat-conducting ring is connected to several heat dissipation fins. After assembly, the high-temperature resistant adhesive in the liquid storage bag is used to bond the upper plate and the bottom plate. S4. Deionized water is injected into the upper and lower copper mesh through the liquid inlet. Then, a vacuum is drawn inside to reduce the internal air pressure. After the vacuum is completed, the liquid inlet is punched to deform it.

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