Micro-channel liquid cooling circulation system heat dissipation device

Abstract

The invention relates to the technical field of electric equipment cooling, and particularly discloses a micro-channel liquid cooling circulation system heat dissipation device, which comprises a heated sheet used for conducting heat generated by a to-be-cooled part; a plurality of groups of branch micro-channels are longitudinally arranged in an array and are arranged in each group of heated sheets in a penetrating manner; the first condensation bin is communicated with the liquid inlet ends of all groups of branch microchannels; the second condensation bin communicates with the liquid outlet ends of all the sets of branch micro-channels and is used for receiving the cooling liquid flowing out of all the sets of branch micro-channels; a flow channel is subdivided into multiple stages of sub-channels by branch micro-channels through dividing strips, the flow of a single channel is reduced through hierarchical flow division, the flow resistance is reduced, efficient heat conduction in a three-dimensional space can be achieved through the structure that a heated piece transverse array and the branch micro-channels are longitudinally arranged in a penetrating mode, and an efficient cooling flow distribution network is formed in cooperation with the branch flow channels and cooling flow channels; the heat dissipation area is effectively increased, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling of electrical equipment, and more specifically, it relates to a heat dissipation device for a microchannel liquid cooling circulation system. Background Art

[0002] With the continuous increase in the power density of electronic devices (such as high-computing power chips, 5G base stations, and data center servers), traditional liquid cooling technologies face great challenges;

[0003] Although the existing liquid cooling devices for electronic devices enhance phase change heat transfer through undulating structures, there are still significant defects; for example, the single-level branch microchannels lack a multi-level flow splitting mechanism, and the coolant is prone to form a flow short circuit in the area where heat sources are concentrated, resulting in local flow overload, a sharp increase in pressure drop, and a significant attenuation in heat dissipation efficiency; the fixed-size flow channels cannot respond to temperature changes, and in the high-temperature area, the cross-sectional area is insufficient, resulting in a decrease in the coolant flow rate and the formation of local hot spots, while in the low-temperature area, the redundant flow causes energy consumption waste; in addition, the distribution of traditional vaporization cores is fixed and cannot migrate along with the temperature gradient, the phase change reaction is concentrated in a narrow area, the bubble detachment efficiency is low, and air blockage is easily caused. Summary of the Invention

[0004] In order to overcome the above technical problems, the present invention proposes a heat dissipation device for a microchannel liquid cooling circulation system.

[0005] The object of the present invention can be achieved through the following technical solutions:

[0006] A heat dissipation device for a microchannel liquid cooling circulation system, comprising:

[0007] A heat receiving plate, which is horizontally arranged in multiple groups in an array, and is used for conducting the heat generated by the component to be cooled;

[0008] Branch microchannels, which are vertically arranged in multiple groups in an array and penetrate through each group of heat receiving plates. The branch microchannels include a hollow shell, and a plurality of partition strips are movably arranged in the hollow shell, and cooling channels are formed between adjacent partition strips;

[0009] A first condensation chamber, which is communicated with the liquid inlet ends of each group of branch microchannels, and includes a first cavity. A first diversion plate that is hermetically connected to the branch microchannels is arranged on one side of the first cavity close to each group of branch microchannels, and a liquid inlet is arranged on the side of the first cavity far from the branch microchannels; a plurality of isolation plates corresponding to the partition strips are arranged on the first diversion plate, and branch channels communicated with the corresponding cooling channels are formed between adjacent isolation plates; a flow splitting member adapted to each group of isolation plates is further arranged in the first cavity;

[0010] A second condensation chamber, which is communicated with the liquid outlet ends of each group of branch microchannels and is used for receiving the coolant flowing out of each group of branch microchannels.

[0011] As a further solution of the present invention: The shunt member includes a flexible isolation belt, an elastic winding member, and a stretching driving member. The flexible isolation belt movably covers the opening end of the branch flow channel, and an installation groove for accommodating the flexible isolation belt is provided on the inner wall of the first cavity; the elastic winding member is installed on one side inside the first cavity for elastically winding one end of the flexible isolation belt; the stretching driving member is arranged outside the first cavity for stretching the end of the flexible isolation belt away from the elastic winding member.

[0012] As a further solution of the present invention: The elastic winding member includes an isolation cover fixed inside the first cavity. A sleeve rod is fixed inside the isolation cover, and a winding drum is rotatably sleeved on the sleeve rod. A coil spring is connected between the winding drum and the isolation cover. One end of the flexible isolation belt is fixedly wound around the winding drum, and a sealing strip abuting against the flexible isolation belt is provided on the isolation cover.

[0013] As a further solution of the present invention: The stretching driving member includes two groups of winding wheels symmetrically and rotatably installed outside the first cavity. The two groups of winding wheels are coaxially and fixedly connected by a connecting shaft. A driving motor for driving the connecting shaft is installed on one side of the first cavity, and a cable connected to the flexible isolation belt is wound on the winding wheel.

[0014] As a further solution of the present invention: Shape memory alloy films are symmetrically arranged on both sides of the partition strip.

[0015] As a further solution of the present invention: Elastic corrugated sheets are movably arranged in each cooling flow channel. Both sides of the elastic corrugated sheet are abutted against the corresponding shape memory alloy films. One end of the elastic corrugated sheet close to the first condensation chamber is fixed in the corresponding cooling flow channel through a fixing column; a plurality of vaporization core areas are formed by enclosing the elastic corrugated sheet and the shape memory alloy films on both sides, and through holes communicating adjacent vaporization core areas are provided on the elastic corrugated sheet.

[0016] As a further solution of the present invention: The second condensation chamber includes a second cavity. A second flow guide plate sealingly connected to the branch microchannels is provided on one side of the second cavity close to each group of branch microchannels, and a liquid outlet is provided on the side of the second cavity away from the branch microchannels.

[0017] As a further solution of the present invention: An inlet section, a middle section, and an outlet section are sequentially arranged between the second flow guide plate and the liquid outlet. A super-hydrophilic coating is provided in the inlet section, hydrophobic-hydrophilic alternating stripes are provided in the middle section, and a super-hydrophobic coating is provided in the outlet section.

[0018] As a further solution of the present invention: Piezoelectric peristaltic pumps are provided between the inlet section and the middle section and between the middle section and the outlet section.

[0019] As a further solution of the present invention: a number of support frames are equidistantly arranged on the branch microchannels, and mounting seats are fixed on both sides of the support frames.

[0020] Advantages of the present invention:

[0021] The branch microchannels are subdivided into multiple levels of sub-channels by the partition bars, and the flow rate of a single channel is reduced through hierarchical flow division, reducing the flow resistance. The structure of the heat-receiving sheets arranged in a horizontal array and the branch microchannels penetrating longitudinally can achieve efficient three-dimensional heat conduction. Combined with the branch flow channels and the cooling flow channels, an efficient cooling flow distribution network is formed, effectively increasing the heat dissipation area and improving the heat dissipation efficiency;

[0022] The first diversion plate and the isolation plate form a hierarchical flow division structure. Cooperating with the flow dividing parts, it ensures that the coolant is evenly distributed to each branch microchannel and can dynamically adjust the cooling flow rate according to the actual working conditions, reducing power consumption while ensuring the heat dissipation performance;

[0023] The vaporization core area formed by enclosing the elastic corrugated sheet and the shape memory alloy film can migrate along with the temperature gradient, combined with the micro-scale turbulence induced by the through holes, improving the phase change heat transfer efficiency;

[0024] The second condensation chamber is designed with a three-stage wettability gradient of superhydrophilic-hydrophobic alternation-superhydrophobic, and cooperates with the directional drive of the piezoelectric peristaltic pump to shorten the residence time of the coolant and increase the droplet detachment speed, thereby effectively improving the overall cooling efficiency. Description of the Drawings

[0025] The present invention will be further described below with reference to the drawings.

[0026] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0027] Figure 2 is Figure 1 the enlarged view at A in

[0028] Figure 3 is a cross-sectional view of the first condensation chamber of the present invention;

[0029] Figure 4 is a cross-sectional view of the first condensation chamber from another perspective of the present invention;

[0030] Figure 5 is Figure 4 the enlarged view at B in

[0031] Figure 6 is a structural schematic diagram of the stretching driving member of the present invention;

[0032] Figure 7 is a cross-sectional view of the branch microchannel of the present invention;

[0033] Figure 8For Figure 7 Enlarged view at position C in

[0034] Figure 9 Cross-sectional view of the branch microchannel in the present invention;

[0035] Figure 10 Schematic structural diagram of the second condensation chamber in the present invention.

[0036] In the figure:

[0037] 100, First condensation chamber; 110, First cavity; 111, Installation groove; 120, Liquid inlet; 130, First guide plate; 140, Partition plate; 150, Flexible isolation belt; 160, Elastic winding member; 161, Isolation cover; 162, Sleeve rod; 163, Reel; 164, Torsion spring; 165, Sealing strip; 170, Tensile driving member; 171, Winding wheel; 172, Connecting shaft; 173, Driving motor; 174, Cable;

[0038] 200, Second condensation chamber; 210, Second cavity; 220, Second guide plate; 230, Liquid outlet; 240, Inlet section; 250, Middle section; 260, Outlet section; 270, Piezoelectric peristaltic pump;

[0039] 300, Branch microchannel; 310, Hollow housing; 320, Partition strip; 330, Shape memory alloy film; 340, Elastic corrugated sheet; 341, Through hole; 350, Vaporization core area; 360, Fixed column;

[0040] 400, Heating sheet; 500, Support frame; 600, Mounting seat. Detailed implementation mode

[0041] Now, the subject matter described herein will be discussed with reference to exemplary embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0042] Please refer to Figure 1 , Figure 3 and Figure 4, the present invention discloses a heat dissipation device for a microchannel liquid cooling circulation system, including a first condensation chamber 100, a second condensation chamber 200, a branched microchannel 300, and a heat-receiving sheet 400; multiple groups of the heat-receiving sheets 400 are arranged in a horizontal array for conducting the heat generated by the component to be cooled; multiple groups of the branched microchannels 300 are arranged in a vertical array and penetrate through each group of the heat-receiving sheets 400, including a hollow housing 310, and a plurality of partition strips 320 are movably arranged in the hollow housing 310, and a cooling flow channel is formed between adjacent partition strips 320; the first condensation chamber 100 is communicated with the liquid inlet ends of each group of the branched microchannels 300, including a first cavity 110, a first flow guide plate 130 sealed to the branched microchannel 300 is arranged on one side of the first cavity 110 close to each group of the branched microchannels 300, and a liquid inlet 120 is arranged on the side of the first cavity 110 away from the branched microchannel 300; a plurality of isolation plates 140 corresponding to the partition strips 320 are arranged on the first flow guide plate 130, and a branched flow channel communicated with the corresponding cooling flow channel is formed between adjacent isolation plates 140; a flow dividing member adapted to each group of the isolation plates 140 is further arranged in the first cavity 110; the second condensation chamber 200 is communicated with the liquid outlet ends of each group of the branched microchannels 300 for receiving the coolant flowing out of each group of the branched microchannels 300;

[0043] Specifically, the coolant enters the first cavity 110 of the first condensation chamber 100 through the liquid inlet 120. The flow dividing member and the isolation plate 140 cooperate to evenly distribute the coolant into the branched flow channels formed by being surrounded by adjacent isolation plates 140, and then flow into the cooling flow channels formed by being separated by the partition strips 320 in the branched microchannel 300;

[0044] The first flow guide plate 130 ensures that the coolant does not leak into the branched microchannel 300 through the sealed connection. The heat-receiving sheets 400 are arranged in a horizontal array and are in direct contact with the component to be cooled, such as a chip, and conduct the heat generated by it to the branched microchannel 300 embedded therein; when the coolant flows between the partition strips 320 of the cooling flow channel, heat exchange is performed with the heat-receiving sheet 400 through the wall surface of the hollow housing 310, and the temperature rises after absorbing the heat; the high-temperature coolant after absorbing the heat enters the second condensation chamber 200 from the liquid outlet end of the branched microchannel 300, and is circulated and dissipated by an external cooling system to return to the low-temperature state; the second condensation chamber 200 is connected to the first condensation chamber 100 or an external circulation pump through a return pipe to form a closed-loop liquid cooling cycle.

[0045] It should be noted that the branched microchannel 300 divides the flow channel into multiple levels of sub-channels through the partition strips 320, reduces the flow rate of a single channel through hierarchical flow division, and reduces the flow resistance. The structure in which the heat-receiving sheets 400 are arranged in a horizontal array and the branched microchannels 300 penetrate vertically can achieve efficient heat conduction in three-dimensional space. Cooperating with the branched flow channels and the cooling flow channels, an efficient cooling flow distribution network is formed, effectively increasing the heat dissipation area and improving the heat dissipation efficiency;

[0046] The first deflector 130 and the isolation plate 140 form a hierarchical flow splitting structure, which, in cooperation with the flow splitting member, ensures the uniform distribution of the coolant to each branch microchannel 300 and can dynamically adjust the cooling flow according to the actual working conditions, reducing power consumption while ensuring the heat dissipation performance.

[0047] In one embodiment, please refer to Figure 3 , the flow splitting member includes a flexible isolation belt 150, an elastic winding member 160, and a stretching driving member 170. The flexible isolation belt 150 movably covers the opening end of the branch flow channel, and an installation groove 111 for accommodating the flexible isolation belt 150 is formed on the inner wall of the first cavity 110; the elastic winding member 160 is installed on one side inside the first cavity 110 for elastically winding one end of the flexible isolation belt 150; the stretching driving member 170 is arranged outside the first cavity 110 for stretching the end of the flexible isolation belt 150 away from the elastic winding member 160.

[0048] Specifically, the stretching driving member 170 applies a pulling force to the end of the flexible isolation belt 150 away from the elastic winding member 160, causing it to unfold from the installation groove 111. By stretching the flexible isolation belt 150, the area covering the branch flow channel is changed, thereby adjusting the opening degree of the branch flow channel; when the flow demand decreases, the stretching driving member 170 releases the pulling force, and the elastic winding member 160 rewinds the flexible isolation belt 150 back into the installation groove 111 through the elastic restoring force, reducing the opening degree of the branch flow channel. Through the synergistic effect of the flexible isolation belt 150 and the stretching driving member 170, the unfolding amount of the flexible isolation belt 150 is dynamically matched with the cooling flow demand, supporting the real-time adjustment of the opening degree of the branch flow channel and adapting to different heat dissipation load scenarios.

[0049] It should be noted that the flexible isolation belt 150 can be made of flexible materials such as silica gel or polyimide film, so as to conform to the pressure fluctuation in the flow channel, avoid the opening degree jamming caused by impurity accumulation, and can closely fit the opening end of the branch flow channel to ensure the effective sealing of the branch flow channel it covers.

[0050] Further, please refer to Figure 4 and Figure 5 , the elastic winding member 160 includes an isolation cover 161 fixed inside the first cavity 110. A sleeve rod 162 is fixed inside the isolation cover 161. A winding drum 163 is rotatably sleeved on the sleeve rod 162. A torsion spring 164 is connected between the winding drum 163 and the isolation cover 161. One end of the flexible isolation belt 150 is fixedly wound on the winding drum 163, and a sealing strip 165 abutting against the flexible isolation belt 150 is arranged on the isolation cover 161.

[0051] Specifically, the winding drum 163 is rotatably mounted in the isolation cover 161 through a sleeve rod 162. Both ends of the coil spring 164 are fixed to the winding drum 163 and the isolation cover 161 respectively. When the tensile driving member 170 applies a tensile force, the flexible isolation belt 150 unfolds from the winding drum 163 and covers the opening end of the branch flow channel to adjust the opening degree. After the tensile force is released, the elastic restoring force of the coil spring 164 drives the winding drum 163 to rotate in the reverse direction, and the flexible isolation belt 150 is rewound again, so as to ensure that the flexible isolation belt 150 is always taut and covers the opening end of the branch flow channel;

[0052] In addition, the sealing strip 165 can be made of fluororubber material, which is closely attached to the surface of the flexible isolation belt 150, realizing the effective isolation of the flexible isolation belt 150 from the liquid inlet end of the first cavity 110 and the branch flow channel, and preventing the coolant at the liquid inlet end of the first cavity 110 from seeping into the blocked branch flow channel.

[0053] Furthermore, please refer to Figure 6 , the tensile driving member 170 includes two groups of winding wheels 171 symmetrically and rotatably mounted on the outer side of the first cavity 110. The two groups of winding wheels 171 are coaxially and fixedly connected through a connecting shaft 172. A driving motor 173 for driving the connecting shaft 172 is installed on one side of the first cavity 110. A cable 174 connected to the flexible isolation belt 150 is wound on the winding wheel 171;

[0054] Specifically, when the driving motor 173 is started, it drives the connecting shaft 172 to rotate through the output shaft, driving the two groups of winding wheels 171 to rotate synchronously. One end of the cable 174 is fixed on the winding wheel 171, and the other end is connected to the end of the flexible isolation belt 150 away from the elastic winding member 160. When the winding wheel 171 rotates, the cable 174 is wound or released, realizing the stretching or relaxation of the flexible isolation belt 150. The unfolding length of the flexible isolation belt 150 is linearly corresponding to the rotation angle of the winding wheel 171, realizing stepless adjustment of the opening degree of the branch flow channel.

[0055] In another embodiment, please refer to Figure 7 and Figure 8 , shape memory alloy films 330 are symmetrically arranged on both sides of the partition strip 320;

[0056] Specifically, the shape memory alloy films 330 are symmetrically attached to both sides of the partition strip 320, and it is preset that they undergo shrinkage deformation (shrinkage rate 5%-8%) at the high-temperature phase change temperature (such as 60°C);

[0057] When the temperature of the coolant in a certain area within the branch microchannel 300 rises, heat is conducted to the shape memory alloy films 330 on both sides of the partition strip 320, thereby triggering the synchronous contraction of the shape memory alloy films 330 on both sides. The cross-sectional area of the adjacent cooling channels increases, so that the coolant flow rate in this area can be increased. After the flow rate in the high-temperature area increases, heat dissipation is accelerated, realizing local heat dissipation enhancement;

[0058] If the shape memory alloy films 330 on both sides undergo differential deformation due to uneven temperature distribution (such as the temperature on the left side being higher than that on the right side), the SMA film on the higher-temperature side shrinks more significantly, pushing the partition strip 320 to shift towards the low-temperature side to balance the flow rate distribution on both sides and avoid the formation of hot spots.

[0059] It should be noted that due to the temperature-controlled deformation characteristics of the shape memory alloy film 330, the partition strip 320 can adjust the cross-sectional area of the cooling channel in real time, improving the flow rate and heat dissipation efficiency in the high-temperature area; the symmetrically arranged shape memory alloy films 330 can automatically compensate for uneven temperature distribution, thereby reducing the fluctuation of flow rate distribution and eliminating the risk of local overheating;

[0060] In addition, the structural setting of the shape memory alloy film 330 does not require external sensors or controllers and completely relies on material characteristics to achieve adjustment, which can effectively reduce the failure rate; the fatigue life of the shape memory alloy film 330 is greater than 10^6 cycles, suitable for long-term high-load operation, and it only triggers deformation at high temperatures without additional energy consumption; the thickness of the shape memory alloy film 330 is only 0.1 - 0.2 mm, seamlessly integrated on the surface of the partition strip 320, without increasing the volume of the channel, and is suitable for a variety of cooling media (such as water, fluorinated liquid, etc.), with a working temperature range of -50°C to 150°C.

[0061] Furthermore, please refer to Figure 8 and Figure 9 As shown in the figure, an elastic corrugated sheet 340 is movably arranged in each cooling channel. Both sides of the elastic corrugated sheet 340 are in contact with the corresponding shape memory alloy film 330. One end of the elastic corrugated sheet 340 close to the first condensation chamber 100 is fixed in the corresponding cooling channel through a fixing column 360; a plurality of vaporization core areas 350 are formed by enclosing the elastic corrugated sheet 340 and the shape memory alloy films 330 on both sides, and through holes 341 communicating adjacent vaporization core areas 350 are formed on the elastic corrugated sheet 340;

[0062] When the temperature of the coolant in the cooling channel changes, the shape memory alloy film 330 undergoes self-adaptive deformation, thereby squeezing the elastic corrugated sheet 340 and prompting the vaporization core area 350 to move along the cooling channel;

[0063] Specifically, when the temperature of the coolant increases, the shape memory alloy thin film 330 undergoes a contraction deformation and squeezes the elastic corrugated sheet 340 inward. After being squeezed, the corrugated structure of the elastic corrugated sheet 340 undergoes elastic deformation, and the distance between the wave crest and the wave trough increases, thereby driving the vaporization core region 350 to move towards the low-temperature side;

[0064] The vaporization core region 350 is formed by the enclosure of the elastic corrugated sheet 340 and the shape memory alloy thin films 330 on both sides, and its initial position is close to the high-temperature end; when the shape memory alloy thin film 330 shrinks and pushes the elastic corrugated sheet 340 to deform, the vaporization core region 350 migrates along the cooling channel towards the low-temperature region, and the migration distance is proportional to the temperature gradient;

[0065] The through hole 341 penetrates the elastic corrugated sheet 340, allowing the vapor of adjacent vaporization core regions 350 to mix with the liquid coolant to form microscale turbulence; the turbulence accelerates the detachment and condensation of bubbles, improving the phase change heat transfer efficiency; the turbulence design of the through hole 341 reduces the flow resistance and simultaneously avoids the gas blockage phenomenon caused by bubble aggregation.

[0066] When the temperature of the coolant decreases, the shape memory alloy thin film 330 returns to its original state, the elastic corrugated sheet 340 resets by its own elasticity, and the vaporization core region 350 returns to its initial position, completing the dynamic adjustment cycle;

[0067] It should be noted that the migration of the vaporization core region 350 makes the boiling phase change always concentrated in the high-temperature region, thereby effectively improving the phase change efficiency; the vaporization core region 350 moves with the temperature gradient, automatically matching the heat source distribution and reducing the local temperature difference.

[0068] In a further embodiment, please refer to Figure 10 , the second condensation chamber 200 includes a second cavity 210. A second flow guide plate 220 that is hermetically connected to the branch microchannels 300 is provided on one side of the second cavity 210 close to each group of branch microchannels 300, and a liquid outlet 230 is provided on the side of the second cavity 210 away from the branch microchannels 300.

[0069] Further, please refer to Figure 10 , an inlet section 240, a middle section 250, and an outlet section 260 are sequentially arranged between the second flow guide plate 220 and the liquid outlet 230. A superhydrophilic coating is provided in the inlet section 240, hydrophobic-hydrophilic alternating stripes are provided in the middle section 250, and a superhydrophobic coating is provided in the outlet section 260;

[0070] Specifically, the inner wall of the inlet section 240 is coated with a superhydrophilic coating (contact angle < 10°). After the coolant flows in from the second deflector 220, it is quickly adsorbed and spreads into a uniform liquid film, reducing the flow resistance; the liquid film quickly diffuses to the entire cross-section of the inlet section 240 through the action of surface tension, improving the flow rate distribution uniformity; the surface of the middle section 250 is designed with hydrophobic-hydrophilic alternating stripes (contact angle of the hydrophobic region is 120°, and contact angle of the hydrophilic region is 20°), and the difference in surface energy is used to guide the droplets to migrate to the hydrophilic region. The droplets coalesce at the stripe junctions to form large droplets, reducing the surface area and thermal resistance, and improving the condensation efficiency; the inner wall of the outlet section 260 is coated with a superhydrophobic coating (contact angle > 160°). The condensate droplets are affected by low adhesion here and detach from the surface in the form of bouncing or rolling, avoiding flow blockage caused by droplet retention;

[0071] It should be noted that in this embodiment, the superhydrophilic coating in the inlet section 240 enables rapid adsorption and uniform flow, the stripe design in the middle section 250 strengthens droplet coalescence, and the superhydrophobic coating in the outlet section 260 accelerates detachment. The three sections cooperate synergistically to effectively improve the overall coolant recovery efficiency;

[0072] Each section of the coating is realized through a photolithography mask + chemical vapor deposition (CVD) process. The surface coating thickness is 100 - 500 nm, without changing the geometric size of the flow channel. The superhydrophobic coating has a temperature resistance range of -50°C - 200°C, and the hydrophobic performance remains stable in an environment with a humidity greater than 90%.

[0073] Furthermore, please refer to Figure 10 , a piezoelectric peristaltic pump 270 is provided between the inlet section 240 and the middle section 250, and between the middle section 250 and the outlet section 260;

[0074] Specifically, the piezoelectric peristaltic pump 270 is embedded in the transition regions between the inlet section 240 and the middle section 250, and between the middle section 250 and the outlet section 260. The periodic deformation of the piezoelectric ceramic sheet is used to drive the contraction and relaxation of the silicone tube, generating a directional peristaltic wave; the peristaltic wave pushes the coolant to migrate step by step from the inlet section 240 to the middle section 250 and then to the outlet section 260, eliminating the sudden change in flow resistance caused by the wettability difference;

[0075] After the superhydrophilic coating in the inlet section 240 adsorbs the coolant to form a thin liquid film, the piezoelectric peristaltic pump 270 applies a low-pressure pulse (0.1 - 0.5 kPa) by adjusting the peristaltic frequency (such as 50 Hz), accelerating the flow of the liquid film to the hydrophobic-hydrophilic alternating region of the middle section 250;

[0076] After the droplets in the middle section 250 coalesce, the peristaltic pump 270 pressurizes again (0.5 - 1 kPa) to overcome the low adhesion of the superhydrophobic coating and quickly push the large droplets into the outlet section 260.

[0077] It should be noted that the one-way valve design of the piezoelectric peristaltic pump 270 ensures that the coolant only flows in the direction of the inlet, middle section, and outlet, preventing the backflow of liquid droplets.

[0078] In addition, please refer to Figure 1 and Figure 2 , a number of support frames 500 are equidistantly arranged on the branch microchannel 300, and mounting seats 600 are fixed on both sides of the support frame 500;

[0079] Specifically, the support frames 500 are equidistantly distributed on the branch microchannel 300, and both sides thereof are fixedly connected to an external heat dissipation substrate or a housing through the mounting seats 600 to form a rigid support network; the support frames 500 are made of high thermal conductivity aluminum alloy, which can quickly conduct the local heat of the microchannel to the mounting seats 600 while providing mechanical support, reducing the risk of thermal stress deformation;

[0080] When the inner wall of the branch microchannel 300 expands due to high pressure or sudden temperature change of the coolant, the support frame 500 restricts the lateral expansion of the flow channel through the anchoring effect of the mounting seat 600;

[0081] The mounting seat 600 is designed as a snap-fit or threaded connection structure, allowing the branch microchannel 300 to be quickly disassembled for cleaning or replacement.

[0082] The specific embodiments of the present invention have been described above, but the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those skilled in the art can also make many forms, all of which fall within the protection scope of the present invention.

Claims

1. A heat dissipation device for a microchannel liquid cooling circulation system, characterized in that, Comprising: A plurality of groups of heat-receiving sheets (400) are arranged in a transverse array for conducting the heat generated by the component to be cooled; A plurality of groups of branch microchannels (300) are arranged in a longitudinal array and penetrate through each group of heat-receiving sheets (400). The branch microchannels (300) include a hollow housing (310), and a plurality of partition bars (320) are movably arranged in the hollow housing (310). Cooling channels are formed between adjacent partition bars (320); A first condensation chamber (100) is communicated with the liquid inlet ends of each group of branch microchannels (300). The first condensation chamber (100) includes a first cavity (110). A first diversion plate (130) hermetically connected to the branch microchannels (300) is arranged on one side of the first cavity (110) close to each group of branch microchannels (300). A liquid inlet (120) is arranged on the side of the first cavity (110) far from the branch microchannels (300); A plurality of isolation plates (140) corresponding to the partition bars (320) are arranged on the first diversion plate (130). Branch channels communicated with the corresponding cooling channels are formed between adjacent isolation plates (140); A flow dividing member adapted to each group of isolation plates (140) is further arranged in the first cavity (110); A second condensation chamber (200) is communicated with the liquid outlet ends of each group of branch microchannels (300) and is used for receiving the coolant flowing out of each group of branch microchannels (300).

2. The heat dissipation device of a microchannel liquid cooling circulation system according to claim 1, wherein The flow dividing member includes: A flexible isolation belt (150) movably covers the opening end of the branch channel. An installation groove (111) for accommodating the flexible isolation belt (150) is formed on the inner wall of the first cavity (110); An elastic winding member (160) is installed on one side inside the first cavity (110) for elastically winding one end of the flexible isolation belt (150); A stretching driving member (170) is arranged outside the first cavity (110) for stretching the end of the flexible isolation belt (150) far from the elastic winding member (160).

3. The heat dissipation device of a microchannel liquid cooling circulation system according to claim 2, wherein The elastic winding member (160) includes an isolation cover (161) fixed inside the first cavity (110). A sleeve rod (162) is fixed inside the isolation cover (161). A winding drum (163) is rotatably sleeved on the sleeve rod (162). A coil spring (164) is connected between the winding drum (163) and the isolation cover (161). One end of the flexible isolation belt (150) is fixedly wound on the winding drum (163). A sealing strip (165) abutted against the flexible isolation belt (150) is arranged on the isolation cover (161).

4. A heat dissipation device for a microchannel liquid cooling circulation system according to claim 2, characterized in that, The stretching driving member (170) includes two groups of winding wheels (171) symmetrically and rotatably installed outside the first cavity (110). The two groups of winding wheels (171) are coaxially and fixedly connected by a connecting shaft (172). A driving motor (173) for driving the connecting shaft (172) is installed on one side of the first cavity (110). A cable (174) connected to the flexible isolation belt (150) is wound on the winding wheel (171).

5. A heat dissipation device for a microchannel liquid cooling circulation system according to claim 1, characterized in that, Shape memory alloy films (330) are symmetrically arranged on both sides of the partition bar (320).

6. The heat dissipation device of a microchannel liquid cooling circulation system according to claim 5, characterized in that, An elastic corrugated sheet (340) is movably arranged in each cooling channel. Both sides of the elastic corrugated sheet (340) are in contact with corresponding shape memory alloy films (330). One end of the elastic corrugated sheet (340) close to the first condensation chamber (100) is fixed in the corresponding cooling channel through a fixing column (360); the elastic corrugated sheet (340) and the shape memory alloy films (330) on both sides enclose a plurality of vaporization core regions (350), and through holes (341) communicating adjacent vaporization core regions (350) are formed in the elastic corrugated sheet (340).

7. A heat dissipation device for a microchannel liquid cooling circulation system according to claim 1, characterized in that, The second condensation chamber (200) includes a second cavity (210). A second flow guide plate (220) sealed to the branch microchannels (300) is arranged on one side of the second cavity (210) close to each group of branch microchannels (300), and a liquid outlet (230) is arranged on the side of the second cavity (210) away from the branch microchannels (300).

8. A heat dissipation device for a microchannel liquid cooling circulation system according to claim 7, characterized in that, An inlet section (240), a middle section (250), and an outlet section (260) are sequentially arranged between the second flow guide plate (220) and the liquid outlet (230). A superhydrophilic coating is arranged in the inlet section (240), hydrophobic-hydrophilic alternating stripes are arranged in the middle section (250), and a superhydrophobic coating is arranged in the outlet section (260).

9. The heat dissipation device of a microchannel liquid cooling circulation system according to claim 8, characterized in that, Piezoelectric peristaltic pumps (270) are arranged between the inlet section (240) and the middle section (250) and between the middle section (250) and the outlet section (260).

10. The heat dissipation device of a microchannel liquid cooling circulation system according to claim 1, characterized in that, A plurality of support frames (500) are equidistantly arranged on the branch microchannels (300), and mounting seats (600) are fixed on both sides of the support frames (500).

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