Double-layer porous fin microchannel heat sink structure with heat pipe phase change properties

Abstract

The present invention relates to the field of electronic cooling technology, specifically, a double-layer porous rib microchannel heat sink structure with heat pipe phase change properties, which includes an upper microchannel and a lower microchannel, and the two are fixedly connected by a middle-layer heat conduction plate; the upper microchannel includes a top cover plate and porous side ribs fixed to each other; the lower microchannel includes a porous groove structure and a heat conduction bottom plate fixed to each other, and the porous side ribs and the porous groove structure are fixed to both sides of the middle-layer heat conduction plate; the porous groove structure includes a rectangular flow channel and a closed steam cavity, which are arranged side by side and alternately, and the rectangular flow channel and the closed steam cavity are sealed and connected by a dense mesh; the porous groove structure, the porous side ribs and the dense mesh are all obtained by depositing metal particle porous materials. The present invention innovatively combines the phase change properties of heat pipe technology and the microchannels of porous side ribs, aiming to create a double-layer porous rib microchannel heat sink structure that can significantly improve the heat exchange efficiency, so as to meet the stringent requirements of modern electronic equipment for heat dissipation.

Description

Technical Field

[0001] The invention relates to the technical field of electronic cooling, in particular to a double-layer porous rib microchannel heat sink structure with heat pipe phase change properties. Background Art

[0002] With the rapid development of modern electronic technology, the power density of electronic devices continues to rise, resulting in increasingly serious problems of heat generation and accumulation. Effective thermal management technology has become crucial, as it is directly related to the performance, stability and life of electronic equipment. Although traditional thermal management technology can meet the heat dissipation needs to a certain extent, its heat dissipation efficiency and response speed gradually expose limitations when facing high power density devices. Therefore, the development of new, efficient and compact heat sink structures to meet the high heat dissipation needs of modern electronic equipment has become the current research focus in the field of thermal management technology.

[0003] After systematic analysis, the traditional double-layer countercurrent porous rib microchannel structure has shown obvious limitations in application. Although the double-layer countercurrent porous rib microchannel structure effectively reduces pump power consumption by forming a slip boundary layer, this design also inevitably weakens the heat transfer effect of the solid ribs, thereby increasing thermal resistance, resulting in a decrease in the utilization efficiency of the coolant in the porous rib microchannel structure, and then a decrease in heat exchange efficiency. In addition, the design of the traditional double-layer countercurrent porous rib microchannel structure is intended to improve the temperature uniformity of the cooled surface, but its performance still needs to be strengthened and improved when dealing with local overheating problems.

[0004] Based on this, the prior art patent application number is 202011087043.X, the publication date is September 16, 2022, and the name is: A double-layer conical microchannel radiator with variable porosity and porous fins, which discloses a new double-layer conical microchannel structure, each of which has an upper conical guide channel and a lower conical guide channel inside its microchannel unit, and the upper conical guide channel and the lower conical guide channel have relative inlet and outlet ends, and sintered porous media are embedded on the inner walls on the left and right sides of the upper conical guide channel and the lower conical guide channel, and phase change microcapsule suspension flows in the upper conical guide channel and the lower conical guide channel.

[0005] However, the long-term stability of phase change microcapsules is a key factor, especially during the recycling process, the phase change microcapsules may be damaged by the external force of shear force, resulting in leakage of phase change materials, thus affecting the long-term performance and reliability of the system. Secondly, the cost issue cannot be ignored. Since the preparation process of phase change microcapsules is complicated and requires special technology, the production cost of phase change microcapsule suspension is relatively high, which limits its promotion in large-scale applications. In addition, fluidity and pumpability are also a technical difficulty. The presence of phase change microcapsules may increase the viscosity of the phase change microcapsule suspension, thereby affecting its fluidity and pumping efficiency in the pipeline, and limiting efficient heat exchange and transmission. Furthermore, thermal performance degradation is a problem that may occur after long-term operation. Due to the damage, aggregation or sedimentation of phase change microcapsules, the heat storage capacity and heat transfer efficiency may decrease, thus affecting the overall performance of the system. Finally, phase separation and sedimentation may occur under static or low flow conditions, resulting in uneven phase change microcapsule suspension, affecting the uniformity of heat exchange and the stability of the system. In addition, blockage of the heat exchange surface is also a potential risk. Phase change microcapsules may cause blockage in the narrow channels of the heat exchanger during flow, thereby affecting the heat transfer efficiency.

[0006] It can be seen that although the above-mentioned documents solve the technical defects existing in the traditional double-layer countercurrent porous rib microchannel structure, they also bring new technical problems. Summary of the invention

[0007] In view of the deficiencies in the above-mentioned prior art, the present invention provides a double-layer porous rib microchannel heat sink structure with heat pipe phase change properties. The present invention innovatively combines the phase change properties of heat pipe technology and the microchannels of porous side ribs, while overcoming the problem of local overheating, effectively improving the utilization rate of the coolant. The purpose is to create a double-layer porous rib microchannel heat sink structure that can significantly improve the heat exchange efficiency, so as to meet the stringent requirements of modern electronic equipment for heat dissipation.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties includes an upper microchannel and a lower microchannel. The upper microchannel uses a microflow channel with porous side ribs for heat dissipation, and the lower microchannel uses the phase change properties of heat pipe technology for heat dissipation. The two are connected by a middle-layer heat conduction plate, which has the function and effect of a condensation end.

[0010] The upper microchannel includes a top cover plate and porous side ribs connected to each other; the lower microchannel includes a porous groove structure and a heat-conducting bottom plate connected to each other, the top cover plate, the porous side ribs, the middle heat-conducting plate, the porous groove structure and the heat-conducting bottom plate are stacked in sequence, and the porous side ribs and the porous groove structure are respectively connected to the middle heat-conducting plate, the middle heat-conducting plate is used to separate the porous side ribs and the porous groove structure, and the top cover plate, the middle heat-conducting plate and the heat-conducting bottom plate are arranged together to facilitate continuous liquid replenishment to the porous groove structure and the porous side ribs;

[0011] The porous groove structure includes a rectangular flow channel and a closed steam cavity. The rectangular flow channel not only realizes the circulation of the coolant in the porous groove structure, but also provides a temperature difference to assist phase change heat dissipation. The closed steam cavity is used for phase change heat dissipation. The porous wick, located at the connection between the thermal conductive base plate and the porous wick, is the evaporation end. After the thermal conductive base plate receives the heat provided by the heat medium, it transfers the heat to the porous wick and realizes the transformation of the coolant from liquid to gas at the evaporation end. After evaporation, the gaseous coolant condenses on the middle thermal conductive plate to realize the transformation of the coolant from gas to liquid, and then Heat is dissipated by phase change of the coolant, and the rectangular flow channel and the closed steam cavity are arranged side by side and alternately, and the rectangular flow channel and the closed steam cavity are sealed and connected by a dense mesh, and the dense mesh is connected to the middle heat conduction plate and the heat conduction bottom plate; the closed steam cavity of the present invention is exquisitely designed, including a porous liquid absorbent core and an evaporation cavity, the evaporation cavity is located in the porous liquid absorbent core, and the dense mesh is sealed and connected between the porous liquid absorbent core and the rectangular flow channel, in the closed steam cavity, the evaporation, liquid replenishment, convergence and condensation parts are closely connected, ensuring an efficient and stable circulation mechanism during the phase change process.

[0012] The rectangular flow channel, the closed steam cavity, the porous side ribs and the dense mesh are all obtained by depositing the metal particle porous material, that is, the rectangular flow channel, the closed steam cavity, the porous side ribs and the dense mesh are all made of the metal particle porous material, the porous groove structure is different from the structure of the porous side ribs, and the dense mesh is a membrane structure made of the metal particle porous material.

[0013] Preferably, the porous side ribs are composed of a plurality of side rib units, which are arranged side by side and in parallel. The side rib units are connected to the top cover plate and the middle heat conducting plate. Microchannels are formed between each adjacent side rib unit. The porous side ribs containing microchannels are arranged in a uniform array of side rib units to optimize fluid flow and heat exchange performance. The porous side ribs are precisely processed using advanced electrochemical deposition additive manufacturing methods to ensure the stability and reliability of the structure.

[0014] Preferably, the widths of the rectangular flow channel, the evaporation chamber, and the microchannel are all 100 μm to 200 μm. When the coolant flows through the microchannel and the rectangular flow channel, the operation of the sliding boundary drag reduction mechanism significantly improves the heat exchange efficiency.

[0015] Preferably, the deposition density of the porous metal particles of the dense mesh is higher than that of the porous metal particles of the rectangular flow channel, and higher than that of the porous metal particles of the closed steam cavity. The evaporation chambers of the rectangular flow channel and the closed steam cavity are carefully arranged on the heat-conducting bottom plate, and the dense mesh is used to achieve efficient separation between the two to ensure the independence of their respective functions. The high deposition density of the porous metal particles of the dense mesh is to ensure the normal operation of the steam in the closed steam cavity and prevent the coolant from infiltrating into the rectangular flow channel and causing flooding. Flooding means that the closed steam cavity is submerged in water, thereby making the phase change heat transfer mechanism ineffective. At the same time, the rectangular flow channel is connected to the closed steam cavity through the dense mesh, so that the porous metal particles at the evaporation end remain interconnected.

[0016] Preferably, the porous metal particle material is a porous material deposited from red copper, which is inexpensive and has excellent thermal conductivity.

[0017] Preferably, the porosity of the dense mesh is ≤1%, and the average pore size of the dense mesh is less than 10nm; the porosity of the evaporation chamber, the rectangular flow channel, and the side rib unit is 50%~60%, and the average pore size is less than 20μm, and the evaporation chamber, the rectangular flow channel, and the side rib unit ensure that the coolant is adsorbed in the pores.

[0018] Preferably, a first inlet and a first outlet are provided on opposite sides of the porous side ribs, and a second inlet and a second outlet are provided on opposite sides of the porous groove structure. The first inlet, the first outlet, the second inlet and the second outlet are all used for the flow of coolant.

[0019] Preferably, the first inlet and the second outlet are located on the same side, and the first outlet and the second inlet are located on the same side. At this time, the flow directions of the coolant in the porous side ribs and the porous groove structure are opposite, thereby achieving efficient heat exchange; and the first inlet, the first outlet, the second inlet, and the second outlet are all located on the side, thereby facilitating the introduction and discharge of the coolant.

[0020] Preferably, the double-layer porous rib microchannel heat sink structure with heat pipe phase change properties is obtained by electrochemical deposition room temperature metal 3D printing technology, which can achieve the production of complex and dense metal parts without relying on heat treatment. It not only has the ability to manufacture micron-level features, complex internal structures and high-purity parts, but also shows the advantages of rapid scalability and support for large-scale manufacturing.

[0021] Preferably, the double-layer porous rib microchannel heat sink structure with heat pipe phase change properties is integrally formed, and the top cover plate, the middle heat conductive plate, and the heat conductive bottom plate can also be composed of metal particle porous materials, that is, the electrochemical deposition room temperature metal 3D printing technology is used to realize the overall printing of the double-layer porous rib microchannel heat sink structure with heat pipe phase change properties. After printing, the porosity of the top cover plate, the middle heat conductive plate, and the heat conductive bottom plate are all 50% to 60%, and the average pore size is less than 20μm;

[0022] In addition, the top cover plate, the middle heat conductive plate, and the heat conductive bottom plate can also be made of other heat conductive materials, which are connected to the top cover plate, the middle heat conductive plate, and the heat conductive bottom plate after printing to obtain the porous groove structure, the porous side ribs, and the dense mesh.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The structure of the present invention is composed of an upper microchannel and a lower microchannel. The upper microchannel and the lower microchannel adopt a countercurrent flow of coolant to achieve efficient heat exchange.

[0025] 2. The present invention designs porous side ribs above the middle heat conducting plate. The porous side ribs are composed of a plurality of side rib units, which are arranged side by side and in parallel, and a microchannel is formed between the plurality of side rib units. The design of the porous side ribs significantly improves the sliding drag reduction of the coolant, and the generated sliding boundary effectively reduces the velocity gradient of the coolant, thereby enhancing the convective heat transfer coefficient and achieving a more excellent condensation effect. In addition, the side rib units of the present invention are made of a porous metal particle material formed by electrochemical deposition room temperature metal 3D printing technology, and the porous metal particle material forms a porous metal particle structure with excellent capillary ability. Therefore, the porous side ribs utilize their excellent liquid absorption ability in conjunction with the sliding drag reduction mechanism to effectively improve the condensation effect of the middle heat conducting plate.

[0026] The closed steam cavity includes a porous wick and an evaporation cavity. The evaporation cavity is located in the porous wick. After the coolant in the closed steam cavity evaporates from the evaporation end, it condenses on the middle heat conduction plate and liquefies. Based on the capillary action of the porous wick, the liquid coolant will be effectively returned to the evaporation end, thereby forming an efficient and stable circulation mechanism during the phase change process. The design of this double-layer porous rib microchannel heat sink structure significantly enhances the heat exchange performance through the synergistic effect of the porous groove structure and the porous side ribs.

[0027] 3. The present invention is provided with a closed steam cavity, and phase change heat transfer is performed in the closed steam cavity. Phase change heat transfer refers to the transfer of heat during the phase change of a substance. Evaporation means that when a liquid absorbs enough heat, its molecules obtain enough kinetic energy. At this time, the intermolecular forces inside the liquid are overcome, and the liquid enters the gas phase. This process absorbs a large amount of heat, which is called the latent heat of vaporization; condensation means that when a gas loses enough heat, its molecular kinetic energy decreases, and the intermolecular attraction causes it to recombine into a liquid. This process releases a large amount of heat, which is called the latent heat of condensation. The present invention utilizes the principle of phase change heat transfer: heat is efficiently transferred through evaporation and condensation cycles. The porous groove structure is filled with coolant. The coolant evaporates at the evaporation end and absorbs heat. The steam rises in the evaporation cavity and then reaches the middle heat conduction plate to condense and release heat. The condensed coolant returns to the evaporation end through capillary force or gravity. This design effectively alleviates the problem of local overheating at the evaporation end.

[0028] In addition, in the porous groove structure, rectangular flow channels and closed steam cavities are arranged alternately. The design of rectangular flow channels and alternating arrangements ensures that the porous liquid wick always maintains a saturated state of coolant, thereby effectively preventing local drying and deterioration of heat exchange.

[0029] 4. The present invention also successfully makes up for the problem of insufficient cooling liquid due to the sacrifice of heat transfer effect in the closed steam cavity. The cooling liquid circulates in the closed steam cavity, and the circulation process undergoes evaporation process, steam transmission, condensation process and reflux process; evaporation process: the heat medium heats the heat-conducting bottom plate, and then transfers the heat to the evaporation end, the cooling liquid in the porous wick absorbs heat and evaporates, and the cooling liquid is converted from liquid to gas. The evaporation process absorbs a large amount of latent heat, thereby taking away the heat of the heat source; steam transmission: the gaseous cooling liquid flows rapidly along the evaporation cavity to the middle heat conduction plate due to the pressure difference; condensation process: after the gaseous cooling liquid reaches the middle heat conduction plate, it contacts with the cold source, releases latent heat, and condenses into liquid cooling liquid. The condensation process releases a large amount of latent heat and transfers the heat to the cold source; reflux process: after condensation, the liquid cooling liquid flows back to the evaporation end along the porous wick through capillary action or gravity action. The porous structure of the porous wick provides a channel for the cooling liquid to reflux, ensuring the circulation of the cooling liquid.

[0030] 5. The present invention adopts electrochemical deposition room temperature metal 3D printing technology to obtain a dense mesh. In order to ensure that the dense mesh can effectively prevent water from passing through, the porosity in the dense mesh is ≤1, which means that the dense mesh is almost completely dense, with only a very small number of pores. In order to effectively prevent water from passing through, the average pore size in the dense mesh is less than 10nm. With the help of the dense mesh, the rectangular flow channel and the closed steam cavity are effectively separated, which effectively avoids flooding in the evaporation chamber, avoids the failure of the phase change heat transfer mechanism in the evaporation chamber, and ensures the stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of a double-layer porous rib microchannel heat sink structure with heat pipe phase change properties of the present invention;

[0032] Figure 2 It is a schematic diagram of the split structure of the double-layer porous rib microchannel heat sink structure with heat pipe phase change properties of the present invention;

[0033] Figure 3 A schematic diagram of a porous groove structure of a double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to the present invention;

[0034] Figure 4 It is a schematic diagram of the connection structure of the rectangular flow channel and the closed steam cavity of the double-layer porous rib microchannel heat sink structure with heat pipe phase change properties of the present invention;

[0035] Figure 5 It is a schematic diagram of the connection structure of the rectangular flow channel, the dense mesh and the closed steam cavity of the double-layer porous rib microchannel heat sink structure with heat pipe phase change properties of the present invention;

[0036] Figure 6 A cross-sectional view of a closed steam cavity of a double-layer porous rib microchannel heat sink structure with heat pipe phase change properties of the present invention;

[0037] Figure 7 A schematic diagram of a porous side rib structure of a double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to the present invention;

[0038] Figure 8 It is a schematic diagram of the side rib unit structure of the double-layer porous rib microchannel heat sink structure with heat pipe phase change properties of the present invention.

[0039] Explanation of the reference numerals: top cover plate 1, middle heat conducting plate 2, heat conducting bottom plate 3, porous side ribs 4, porous groove structure 5, rectangular flow channel 6, closed steam cavity 7, dense mesh 8, porous liquid wick 9, evaporation chamber 10, side rib unit 11. DETAILED DESCRIPTION

[0040] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention. The experimental methods described in the embodiments of the present invention are conventional methods unless otherwise specified.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium, internal communication between two elements or interaction between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] 1. The common double-layer countercurrent porous rib microchannel structure is a microscopic geometric structure constructed by a high-energy beam-driven 3D printing method, which often exhibits significant thermal deformation / stress deformation and significant pore and crack defects. The generation of these defects mainly stems from the fact that the microstructure needs to undergo rapid temperature changes and phase changes in a very short period of time. Therefore, the thermally driven additive manufacturing technology is incapable of producing high-quality metal micromaterials. Based on this, the demand for non-thermal or low-temperature micro-additive manufacturing technology has become particularly urgent. The present invention adopts electrochemical deposition room temperature metal 3D printing technology, which can realize the production of complex and dense metal parts without relying on heat treatment. This technology not only has the ability to manufacture micron-level features, complex internal structures and high-purity parts, but also shows the advantages of rapid scalability and support for large-scale manufacturing.

[0045] 2. When the double-layer porous rib microchannel heat sink structure with heat pipe phase change properties of the present invention is in stable operation, the evaporation end can always be in a wet state under the capillary action of the metal particle porous material, the coolant evaporates at the evaporation end, and the high-temperature gaseous coolant flows in the evaporation chamber 10 and flows to the middle layer heat conduction plate 2 for condensation, and the heat exchange and heat transfer capacity is strong. The isolation of the dense reticular membrane 8 prevents the coolant from entering the closed steam cavity 7 through the rectangular flow channel 6, and at the same time ensures the uniform rehydration of each area of ​​the porous liquid wick 9, avoiding the evaporation end from drying up, resulting in deterioration of heat exchange.

[0046] 3. During operation, when the coolant flows through the microchannels between the side rib units 11, based on the operation of the slip boundary mechanism, it can significantly enhance the convective heat transfer efficiency between the porous groove structure 5, thereby achieving an effective reduction in the temperature of the middle layer heat conduction plate 2. This enhancement effect ensures the smooth occurrence of the phase change process and realizes the coupling of phase change and slip drag reduction.

[0047] The technical solution of the present invention is further explained by using embodiments below, which are specifically as follows:

[0048] Example 1

[0049] Double-layer porous fin microchannel heat sink structure with heat pipe phase change properties, such as Figure 1~Figure 2 As shown, it includes an upper microchannel and a lower microchannel, and the two are fixedly connected by a middle heat conducting plate 2;

[0050] The upper microchannel includes a top cover plate 1 and porous side ribs 4 fixed to each other; the lower microchannel includes a porous groove structure 5 and a heat-conducting bottom plate 3 fixed to each other, the top cover plate 1, the porous side ribs 4, the middle heat-conducting plate 2, the porous groove structure 5 and the heat-conducting bottom plate 3 are stacked in sequence from top to bottom, and the porous side ribs 4 and the porous groove structure 5 are respectively fixed to the middle heat-conducting plate 2;

[0051] like Figure 3~Figure 6 As shown, the porous groove structure 5 includes a rectangular flow channel 6 and a closed steam cavity 7, which are arranged side by side and alternately, and the rectangular flow channel 6 and the closed steam cavity 7 are sealed and connected by a dense mesh 8, the porosity of the dense mesh is 0.85%, and the average pore size of the dense mesh is 9nm. The dense mesh 8 is fixed to the middle heat conducting plate 2 and the heat conducting bottom plate 3. The flow channel size of the rectangular flow channel is 20mm×0.143mm×0.5mm, and the size of the evaporation chamber 10 is 19mm×0.143mm×0.5mm;

[0052] The rectangular flow channel 6, the closed steam cavity 7, the porous side ribs 4 and the dense mesh 8 are all obtained by depositing a metal particle porous material. The porosity of the evaporation chamber, the rectangular flow channel and the side rib unit is 55%, and the average pore size is 14 μm. The metal particle porous material is a porous material deposited from copper.

[0053] like Figure 7~Figure 8 As shown, the porous side rib 4 is composed of a plurality of side rib units 11, which are arranged side by side and in parallel. The side rib units 11 are fixedly connected to the top cover plate 1 and the middle heat conducting plate 2. A microchannel is formed between each two adjacent side rib units 11, and the width of the microchannel is 143 μm. The size of the porous side rib 4 is 20 mm×20 mm×0.5 mm, and there are 70 side rib units 11. The width W of each side rib unit 11 is f =0.143mm.

[0054] The closed steam cavity 7 includes a porous liquid wick 9 and an evaporation cavity 10. The evaporation cavity 10 is located in the porous liquid wick 9, and the dense mesh 8 is sealed and connected between the porous liquid wick 9 and the rectangular flow channel 6. The deposition density of the metal particle porous material of the dense mesh 8 is higher than the deposition density of the metal particle porous material of the rectangular flow channel 6, and higher than the deposition density of the metal particle porous material of the closed steam cavity 7, so as to prevent the coolant in the rectangular flow channel 6 from penetrating into the closed evaporation cavity 7 and causing flooding.

[0055] A first inlet and a first outlet are provided on opposite sides of the porous side rib 4, and a second inlet and a second outlet are provided on opposite sides of the porous groove structure 5. The first inlet and the second outlet are located on the same side, and the first outlet and the second inlet are located on the same side. At this time, the flow directions of the coolant in the porous side rib 4 and the porous groove structure 5 are opposite, and the counter-flow of the coolant in the upper microchannel and the lower microchannel is adopted to enhance the heat dissipation.

[0056] The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties is obtained by electrochemical deposition room temperature metal 3D printing technology and is processed in one piece. The metal particle porous material uses red copper porous material with good thermal conductivity and low price.

[0057] Directions:

[0058] When the present invention is used, the heat medium is placed close to the heat-conducting bottom plate 3, and then the double-layer porous rib microchannel heat sink structure with heat pipe phase change properties is used. The coolant first flows into the rectangular flow channel 6. Since the porous groove structure 5 is obtained by depositing a metal particle porous material, the metal particle porous material will play a role in absorbing and replenishing liquid, ensuring that the porous liquid wick 9 of the closed steam cavity 7 is stably supplied with coolant. As the temperature of the heat-conducting bottom plate 3 rises, the heat is transferred to the evaporation end. The coolant at the evaporation end will undergo an evaporation phase change process, so that the coolant is converted from liquid to gas. The high-temperature gaseous coolant flows in the evaporation chamber 10 and flows to the middle-layer heat-conducting plate 2, and then the middle-layer heat-conducting plate 2 is used for condensation. After condensation, the liquid coolant flows back to the evaporation end.

[0059] At this time, the first inlet is connected to the second outlet, and the first outlet is connected to the second inlet. The coolant in the porous groove structure 5 flows to the porous side ribs 4. The design of the microchannels in the porous side ribs 4 optimizes the condensation environment of the middle layer heat conduction plate 2 and enhances the condensation effect. The coolant in the porous side ribs 4 flows back to the porous groove structure 5 to form a cycle.

[0060] Example 2

[0061] On the basis of Example 1, in order to enhance the heat dissipation effect, coolant can be introduced into the porous side ribs 4 and the porous groove structure 5 respectively, instead of circulating the coolant in the porous side ribs 4 and the porous groove structure 5 .

[0062] Example 3

[0063] Based on Example 1, the width of the side rib unit 11 is increased from W to f =0.143mm replaced by W f =0.1mm, and the width of the microchannel is replaced from 143μm to 200μm, forming a new implementation method.

[0064] Example 4

[0065] Based on Example 1, the width of the side rib unit 11 is increased from W to f =0.143mm replaced by W f =0.2mm, and the width of the microchannel is replaced from 143μm to 100μm, forming a new implementation method.

[0066] Example 5

[0067] On the basis of Example 3, the channel size of the rectangular channel 6 is replaced from 20mm×0.143mm×0.5mm to 20mm×0.1mm×0.5mm, and the size of the evaporation chamber 10 is replaced from 19mm×0.143mm×0.5mm to 19mm×0.2mm×0.5mm, forming a new implementation method.

[0068] Example 6

[0069] On the basis of Example 3, the flow channel size of the rectangular flow channel 6 is replaced from 20mm×0.143mm×0.5mm to 20mm×0.2mm×0.5mm, and the size of the evaporation chamber 10 is replaced from 19mm×0.143mm×0.5mm to 19mm×0.1mm×0.5mm, forming a new implementation method.

[0070] Example 7

[0071] On the basis of Example 4, the channel size of the rectangular channel 6 is replaced from 20mm×0.143mm×0.5mm to 20mm×0.1mm×0.5mm, and the size of the evaporation chamber 10 is replaced from 19mm×0.143mm×0.5mm to 19mm×0.2mm×0.5mm, forming a new implementation method.

[0072] Example 8

[0073] On the basis of Example 4, the channel size of the rectangular channel 6 is replaced from 20mm×0.143mm×0.5mm to 20mm×0.2mm×0.5mm, and the size of the evaporation chamber 10 is replaced from 19mm×0.143mm×0.5mm to 19mm×0.1mm×0.5mm, forming a new implementation method.

[0074] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. Double-layer porous rib microchannel heat sink structure with heat pipe phase change properties, It is characterized in that It comprises an upper microchannel and a lower microchannel, and the two are connected by a middle heat conduction plate (2); The upper microchannel comprises a top cover plate (1) and porous side ribs (4) connected to each other; the lower microchannel comprises a porous groove structure (5) and a heat-conducting bottom plate (3) connected to each other, the top cover plate (1), the porous side ribs (4), the middle heat-conducting plate (2), the porous groove structure (5) and the heat-conducting bottom plate (3) being stacked in sequence, and the porous side ribs (4) and the porous groove structure (5) are respectively connected to the middle heat-conducting plate (2); The porous groove structure (5) comprises a rectangular flow channel (6) and a closed steam cavity (7), which are arranged side by side and alternately, and the rectangular flow channel (6) and the closed steam cavity (7) are sealed and connected by a dense mesh (8), and the dense mesh (8) is connected to the middle layer heat conduction plate (2) and the heat conduction bottom plate (3); The rectangular flow channel (6), the closed steam cavity (7), the porous side ribs (4) and the dense mesh (8) are all obtained by depositing a porous metal particle material.

2. The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to claim 1, It is characterized in that The closed steam cavity (7) comprises a porous liquid absorbent core (9) and an evaporation chamber (10), the evaporation chamber (10) is located inside the porous liquid absorbent core (9), and the dense mesh (8) is sealed and connected between the porous liquid absorbent core (9) and the rectangular flow channel (6).

3. The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to claim 2, It is characterized in that The deposition density of the porous metal particles in the dense mesh (8) is higher than the deposition density of the porous metal particles in the rectangular flow channel (6), and higher than the deposition density of the porous metal particles in the closed steam cavity (7).

4. The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to claim 3, It is characterized in that The porous side rib (4) is composed of a plurality of side rib units (11), the plurality of side rib units (11) being arranged side by side and in parallel, the side rib units (11) being connected to the top cover plate (1) and the middle layer heat conducting plate (2), and a microchannel is formed between every two adjacent side rib units (11).

5. The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to claim 4, It is characterized in that The widths of the evaporation chamber (10), the rectangular flow channel (6), and the micro-flow channel are all between 100 μm and 200 μm.

6. The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to claim 5, It is characterized in that The porosity of the dense mesh (8) is ≤1%, and the average pore size of the dense mesh (8) is less than 10 nm; the porosity of the evaporation chamber (10), the rectangular flow channel (6), and the side rib unit (11) are all 50% to 60%, and the average pore size is less than 20 μm.

7. The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to claim 1, It is characterized in that The metal particle porous material is a porous material deposited from red copper.

8. The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to claim 1, It is characterized in that The porous side rib (4) is provided with a first inlet and a first outlet on two opposite sides, and the porous groove structure (5) is provided with a second inlet and a second outlet on two opposite sides.

9. The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to claim 8, It is characterized in that The first inlet and the second outlet are located on the same side, and the first outlet and the second inlet are located on the same side.

10. The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties according to claim 1, It is characterized in that The double-layer porous rib microchannel heat sink structure with heat pipe phase change properties is obtained by electrochemical deposition room temperature metal 3D printing technology.

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