Liquid cooling and phase change heat storage coupled heat dissipation device

Abstract

The invention discloses a liquid cooling and phase change heat storage coupled heat dissipation device which comprises a liquid inlet, a liquid outlet, an integrated heat dissipation structure, a cover plate and a phase change material filling hole. The integrated heat dissipation structure is mainly composed of a liquid cooling flow channel, a phase change material and embedded fins, a liquid cooling working medium flows in the flow channel, the outer wall face of the liquid cooling flow channel is filled with the phase change material, the embedded fins are designed into fins distributed in an array mode according to the heat transfer requirement, the phase change material is divided into a plurality of small areas through the fins, and the small areas are distributed in the phase change material. The phase-change material is made of high-heat-conductivity materials such as metal and is used for enhancing the heat transfer performance between the phase-change material and a heat source. Errors generated by replacement of the heat dissipation device under two working conditions are reduced, the debugging and working time is shortened, and the overall space and weight are reduced.

Description

Technical Field

[0001] The invention relates to the field of high-power heat dissipation devices, and in particular to a heat dissipation device coupled with liquid cooling and phase change heat storage. Background Art

[0002] High-power equipment generates a lot of heat consumption during operation. If the heat is not dissipated in time, the heat will accumulate, the temperature of the equipment will rise, the efficiency will be greatly reduced, and even failure will occur. Therefore, a suitable heat dissipation device is needed. For some intermittent working equipment, using phase change materials to store heat is a common method. However, before formal work, in order to cooperate with the whole machine or debug the process, high-power equipment needs to work continuously for a long time, and other heat dissipation methods are required, such as forced air cooling, liquid cooling, etc. Different heat dissipation devices are required in the two states, and the disassembly and assembly process is cumbersome, which increases the installation time; and the coordination of different heat dissipation devices leads to cumulative errors, which is particularly fatal for precision instruments. Therefore, it is considered to couple the heat dissipation of long-term debugging or working stages with the heat dissipation of intermittent work, reduce the overall space and weight resources, shorten the debugging and working cycle, and integrate the heat dissipation design to reduce the errors caused by the heat dissipation device. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a heat dissipation device coupled with liquid cooling and phase change heat storage, which is suitable for high-power equipment. The liquid cooling heat dissipation structure is coupled with the phase change heat storage material to develop a coupled heat dissipation device with long-term liquid cooling heat dissipation capability and intermittent heat storage function, thereby reducing the error caused by the replacement of the heat dissipation device under the two working conditions, shortening the debugging and working time, and reducing the overall space and weight.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: A heat dissipation device coupled with liquid cooling and phase change heat storage, comprising a metal shell, an upper cover plate, a lower cover plate, fins, a liquid cooling heat exchange flow channel and a phase change material; the fins, the liquid cooling heat exchange flow channel and the metal shell are processed from a whole metal material by a machining process; the outer wall surface of the liquid cooling heat exchange flow channel is provided with fins; the liquid cooling heat exchange flow channel is close to a heat source, and the liquid cooling heat exchange flow channel is connected to a liquid cooling medium inlet and a liquid cooling medium outlet to form a flow channel for the liquid cooling medium; the phase change material is filled between the metal shell and the liquid cooling heat exchange flow channel; the metal shell is welded to the upper cover plate and the lower cover plate as a whole; the phase change material is filled between the metal shell and the liquid cooling heat exchange flow channel.

[0005] Furthermore, a liquid cooling medium inlet and a liquid cooling medium outlet are respectively arranged at two ends of the heat dissipation device near the lower cover plate.

[0006] Furthermore, the liquid-cooling heat exchange flow channel is a round tube with a smooth inner wall or a pipe with a rectangular, trapezoidal or hexagonal flow cross-section.

[0007] Furthermore, the inner wall surface of the liquid-cooled heat exchange channel is configured as a bellows or needle fins are arranged inside.

[0008] Furthermore, the liquid-cooling medium inlet and the liquid-cooling medium outlet are arranged outside the heat dissipation device, and the liquid-cooling medium inlet and the liquid-cooling medium outlet both include a first flow port.

[0009] Furthermore, a sealing groove is provided on the contact wall surface between the first flow port and the heat dissipation device, and a sealing ring is filled to ensure sealing.

[0010] Furthermore, the ribs divide the multiple regions, and the multiple regions are filled with phase change material.

[0011] Furthermore, the phase change material is paraffin, fatty acid or crystalline hydrated salt.

[0012] Furthermore, the fins are made of metal or graphite, and the thickness of the fins gradually increases from close to the heat source to far away from the heat source; the number of the fins increases or gradually branches at the end far away from the heat source.

[0013] Furthermore, the phase change material is filled through a reserved filling port on the metal shell, and a second flow port is provided on the fin.

[0014] Beneficial Effects

[0015] 1. The present invention has the temperature control capabilities of liquid cooling and phase change heat storage. The high-power heat source contacts the heat sink for heat conduction, and transfers the heat to the heat sink. The low-temperature liquid cooling medium enters the heat dissipation structure from the liquid inlet, flows in the liquid cooling channel for heat exchange, and reduces the temperature of the heat sink. After the cooling and heat exchange are completed, the liquid cooling medium flows out of the heat sink from the liquid outlet.

[0016] 2. Liquid cooling medium not only reduces the temperature of metal materials in the heat sink, but also reduces the temperature of phase change materials in the heat sink, thereby increasing the heat storage capacity of the phase change materials.

[0017] 3. Fill the heat storage device with phase change material and design high thermal conductivity fins between the phase change materials to enhance the heat transfer performance of the phase change material.

[0018] 4. The outer structure of the metal shell should be determined according to the size of the high-power heat source to ensure that the heat sink can have good thermal contact with the heat source through the metal shell. If the heat source in this embodiment is an arc, the heat sink is designed to be an arc that matches the gap with it, and the single-side gap is no more than 0.5mm. The heat conduction is enhanced by filling high thermal conductivity indium sheets or thermal conductive silicone grease.

[0019] 5. The heat dissipation device uses the same high thermal conductivity material as the base material (including internal fins, liquid cooling heat exchange flow channel, metal shell). The metal shell and high-power heat source are installed by filling indium sheets or thermal grease. The heat is transferred to the wall of the liquid cooling heat exchange pipe through the metal shell, and then the pipe transfers the heat to the low-temperature fluid in the pipe, and the flowing low-temperature fluid quickly takes away the heat. The high thermal conductivity base material and integrated processing technology effectively control the thermal resistance between the heat source and the cold source, thereby ensuring effective heat dissipation of high-power equipment.

[0020] 6. The present invention integrates the phase change material into a substrate with a liquid-cooled heat exchange flow channel, and the liquid-cooled heat exchange flow channel, the metal shell and the fins are made of a high thermal conductivity material processed in one piece, so that the above metal structures become carriers for enhancing the overall heat transfer performance of the phase change material, greatly improving the heat transfer efficiency of the phase change material.

[0021] 7. The present invention ensures the pressure bearing capacity of the structure through integrated integration and effectively utilizes space and weight resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a heat dissipation device coupled with liquid cooling and phase change heat storage of the present invention; Figure 2 It is a front view of the heat dissipation device coupled with liquid cooling and phase change heat storage of the present invention; Figure 3 It is a side view of the heat dissipation device coupled with liquid cooling and phase change heat storage of the present invention; Figure 4 It is a cross-sectional view of the heat dissipation device coupled with liquid cooling and phase change heat storage of the present invention; Figure 5 It is another side view of the heat dissipation device coupled with liquid cooling and phase change thermal storage of the present invention.

[0023] Figure 6 for Figure 5 AA section view in.

[0024] Among them, the figures are marked as: liquid cooling medium inlet 1, metal shell 2, upper cover plate 3, liquid cooling medium outlet 4, filling port 5, lower cover plate 6, first flow port 12, sealing groove 13, rib 21, second flow port 22, liquid cooling heat exchange channel 23, phase change material 24. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1-Figure 6 As shown, a heat dissipation device coupled with liquid cooling and phase change heat storage of the present invention comprises a liquid cooling medium inlet 1, a metal shell 2, an upper cover plate 3, a liquid cooling medium outlet 4, a filling port 5, and a lower cover plate 6. The shape of the metal shell 2 is determined according to the size of the high-power heat source to ensure that the heat dissipation device can have good thermal contact with the heat source through the metal shell 2. In this embodiment, the shape of the heat source is arc-shaped, and the heat dissipation device is designed as an arc-shaped concave structure that matches the gap therewith, and the single-side gap is not greater than 0.5mm, and the thermal conductivity is enhanced by filling high thermal conductivity indium sheets or thermal conductive silicone grease. A filling port 5 is provided on the side of the arc-shaped concave structure of the metal shell 2. The upper cover plate 3 and the lower cover plate 6 are arranged on the upper and lower sides of the metal shell 2.

[0027] The two ends of the arc-shaped concave structure of the heat sink are respectively provided with a liquid cooling medium inlet 1 and a liquid cooling medium outlet 4 near the lower cover plate 6, and a liquid cooling heat exchange flow channel 23 is provided in the heat sink. The outer wall surface of the liquid cooling heat exchange flow channel 23 is provided with ribs 21. The ribs 21, the liquid cooling heat exchange flow channel 23, and the metal shell 2 are processed from a whole metal material through a machining process, avoiding the contact thermal resistance generated by welding and other processes, and ensuring that the internal thermal conduction resistance is minimized.

[0028] The liquid-cooled heat exchange flow channel 23 connects the liquid-cooled working medium inlet 1 and the liquid-cooled working medium outlet 4 to form a flow channel for the liquid-cooled working medium. The phase change material 24 is filled between the metal shell 2 and the liquid-cooled heat exchange flow channel 23. The phase change material 24 is filled in the space inside the metal shell 2 and outside the liquid-cooled heat exchange flow channel 23, and the heat transfer performance of the phase change material 24 is enhanced by setting a plurality of fins 21. In this embodiment, the liquid-cooled heat exchange flow channel 23 is a straight pipe, and its outer wall surface intersects with a plurality of fins 21. In order to enhance the flow heat exchange, the inner wall surface design can be a corrugated tube.

[0029] The liquid cooling heat exchange channel 23 is designed inside the metal shell 2, near the area of ​​the heat source Q. The liquid cooling heat exchange channel 23 runs through the heat sink, so that the liquid cooling medium can flow from the liquid cooling medium inlet 1 through the liquid cooling heat exchange channel 23 inside the heat sink and then flow out from the liquid cooling medium outlet 4.

[0030] Preferably, the liquid cooling heat exchange flow channel 23 can be a round tube with a smooth inner wall, or can be designed to have a flow cross section in various shapes such as a rectangle, a trapezoid, a hexagon, etc. To increase the internal flow heat exchange effect, the inner wall surface of the liquid cooling heat exchange flow channel 23 can be designed as a corrugated tube, internal pin fins, a type with a certain degree of roughness, etc.

[0031] Preferably, the liquid cooling medium inlet 1 and the liquid cooling medium outlet 4 are arranged outside the heat sink, and both the liquid cooling medium inlet 1 and the liquid cooling medium outlet 4 include a first flow port 12, the cross-sectional shape of the first flow port 12 is a circular through hole, which is consistent with the inner diameter of the liquid cooling heat exchange flow channel, and is installed and positioned by screw holes to ensure that the first flow channel port 12 is concentric with the liquid cooling heat exchange flow channel to reduce local flow resistance. A sealing groove 13 is provided on the contact wall between the first flow port 12 and the heat sink, and a sealing ring is filled to ensure sealing.

[0032] A plurality of fins 21 are provided in the cavity between the outside of the liquid cooling heat exchange channel 23 and the inside of the heat sink metal shell 2, preferably formed by machining. Phase change material 24 is filled in the plurality of areas divided by the fins 21. The phase change material 24 can be a material with significant phase change latent heat, such as paraffin, fatty acids, crystalline hydrated salts, etc.

[0033] Preferably, the fins 21 can be made of high thermal conductivity materials such as metal and graphite. Preferably, the cross-sectional shape of the space where the phase change material 24 is located is a trapezoid, such as Figure 6 As shown, the thickness of the fins 21 gradually increases from close to the heat source to far away from the heat source to increase temperature uniformity. According to heat transfer requirements, the cross-section of the fins 21 can be designed to be rectangular or diamond-shaped, and the number of fins can increase or gradually branch at the end far away from the heat source.

[0034] Preferably, the metal shell 2, the upper cover plate 3 and the lower cover plate 6 are welded together by a friction stir welding process. Figure 2 shown.

[0035] The phase change material 24 is filled from the reserved filling port 5 on the metal shell 2. To ensure that the phase change material 24 can be poured into multiple small areas between the fins 21, a second flow port 22 is designed on the fins 21. Preferably, the second flow port 22 can be set at any position of the fin 21, and the shape of the second flow port 22 can be circular, rectangular, etc.

[0036] The heat dissipation device uses the same high thermal conductivity material as the base material (including internal fins 21, liquid cooling heat exchange flow channel 23, metal shell 2), and the metal shell 2 and the high-power heat source are heat-conductingly installed by filling indium sheets or thermal conductive silicone grease, and the heat is transferred to the wall of the liquid cooling heat exchange flow channel 23 through the metal shell 2, and then the liquid cooling heat exchange flow channel 23 transfers the heat to the low-temperature fluid in the liquid cooling heat exchange flow channel 23, and the flowing low-temperature fluid quickly takes away the heat. The thermal resistance between the heat source and the cold source is effectively controlled through the high thermal conductivity base material and the integrated processing technology, thereby ensuring the effective heat dissipation of high-power equipment.

[0037] The present invention integrates the phase change material into a substrate with a liquid cooling heat exchange flow channel, and the liquid cooling heat exchange flow channel, the metal shell and the fins are high thermal conductivity materials processed as a whole, so that the above metal structures all become carriers for enhancing the overall heat transfer performance of the phase change material, greatly improving the heat transfer efficiency of the phase change material. The heat dissipation process of the phase change material is as follows: when the heat source heat is reduced (for example, after the refrigerator is turned on and cooled down, the heat is reduced under the constant temperature state), the heat changes periodically or the liquid cooling unit is not suitable for application, the liquid cooling unit is interrupted, and the heat source transmits heat to the heat dissipation device through the metal shell of the heat dissipation device. The heat of the metal shell of the heat dissipation device is transmitted to the fins or the phase change material, so that the temperature of the metal and the phase change material increases. Taking the solid-liquid phase change as an example, when heated to the melting temperature, a phase change from solid to liquid occurs. During the melting process, the phase change material absorbs and stores a large amount of latent heat, thereby controlling the temperature of the heat source to further increase, achieving the purpose of heat dissipation and temperature control.

Claims

1. A heat dissipation device coupled with liquid cooling and phase change heat storage, characterized in that: It includes a metal shell, an upper cover plate, a lower cover plate, fins, a liquid-cooled heat exchange channel and a phase change material; the fins, the liquid-cooled heat exchange channel and the metal shell are processed from a whole metal material by a machining process; the outer wall surface of the liquid-cooled heat exchange channel is provided with fins; the liquid-cooled heat exchange channel is close to the heat source, and the liquid-cooled heat exchange channel is connected to the liquid inlet and the liquid outlet of the liquid-cooled working medium to form a flow channel for the liquid-cooled working medium; the phase change material is filled between the metal shell and the liquid-cooled heat exchange channel; the metal shell is welded to the upper cover plate and the lower cover plate as a whole; the phase change material is filled between the metal shell and the liquid-cooled heat exchange channel.

2. A heat dissipation device combining liquid cooling and phase change thermal storage according to claim 1, characterized in that: A liquid cooling medium inlet and a liquid cooling medium outlet are respectively arranged at two ends of the heat dissipation device near the lower cover plate.

3. The heat dissipation device combining liquid cooling and phase change thermal storage according to claim 1, characterized in that: The liquid cooling heat exchange flow channel is a round tube with a smooth inner wall or a pipe with a rectangular, trapezoidal or hexagonal flow cross section.

4. The heat dissipation device combining liquid cooling and phase change thermal storage according to claim 1, characterized in that: The inner wall surface of the liquid-cooling heat exchange flow channel is arranged as a bellows or needle fins are arranged inside.

5. The heat dissipation device combining liquid cooling and phase change thermal storage according to claim 1, characterized in that: The liquid-cooling medium inlet and the liquid-cooling medium outlet are arranged outside the heat dissipation device, and both the liquid-cooling medium inlet and the liquid-cooling medium outlet include a first flow port.

6. The heat dissipation device coupled with liquid cooling and phase change thermal storage according to claim 5, characterized in that: A sealing groove is provided on the contact wall surface between the first flow port and the heat dissipation device, and a sealing ring is filled to ensure sealing.

7. The heat dissipation device combining liquid cooling and phase change thermal storage according to claim 1, characterized in that: The ribs divide the plurality of regions, and the plurality of regions are filled with phase change material.

8. The heat dissipation device combining liquid cooling and phase change thermal storage according to claim 1, characterized in that: The phase change material is paraffin, fatty acid or crystalline hydrated salt.

9. The heat dissipation device combining liquid cooling and phase change thermal storage according to claim 1, characterized in that: The fins are made of metal or graphite, and the thickness of the fins gradually increases from close to the heat source to far away from the heat source; the number of the fins increases or gradually branches at the end far away from the heat source.

10. The heat dissipation device combining liquid cooling and phase change thermal storage according to claim 1, characterized in that: The phase change material is filled through a reserved filling port on the metal shell, and a second flow port is provided on the fin.

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