A multiphase flow adaptive liquid cooling device for servers

Abstract

This invention relates to the field of liquid cooling technology and discloses a multiphase flow adaptive liquid cooling device for servers, comprising several cold plates, each with a flow channel inside. Each flow channel contains a dynamic adjustment component, which includes several bends fixedly connected to the flow channel. A bellows is installed between every two bends, and a fixing ring is fixedly connected to the surface of each bellows. A rack and pinion actuator is fixedly connected to the surface of each fixing ring. When the GPU's local temperature rises to a high temperature, the bimetallic strip bends due to expansion difference. This bending drives the drive gear to rotate. Through the transmission of the gear driven component, the rack and pinion actuator moves the fixing ring, thereby stretching the bellows, widening its inner diameter, and increasing the local cross-sectional area of ​​the flow channel. This reduces the coolant flow rate, allowing more coolant to flow to the high-temperature area and fully absorb heat, effectively solving the problem of insufficient heat absorption in high-temperature areas.

Description

Technical Field

[0001] This invention relates to the field of liquid cooling technology, specifically to a multiphase flow adaptive liquid cooling device for servers. Background Technology

[0002] Server liquid cooling systems are devices that introduce coolant into cold plates through internal channels, allowing it to directly contact the server's heat-generating components (such as CPUs and GPUs). After absorbing heat, the coolant is carried away through a circulation system, thereby achieving efficient heat dissipation and ensuring stable server operation.

[0003] In the current server field, with the continuous growth of demand for high-performance computing, the workload of GPUs in servers is becoming increasingly heavy. GPUs generate heat continuously during use, which places extremely high heat dissipation requirements on liquid cooling devices. However, existing liquid cooling devices for servers have many problems that urgently need to be solved.

[0004] When a GPU operates under high load, it generates significant temperature differences. Because the flow channels in existing technologies are usually fixed and lack adaptive adjustment capabilities, localized overheating areas appear when the GPU is under high-intensity operation. The temperature in these areas may soar to 90 degrees Celsius or even higher. In stark contrast, the temperature in low-load areas is about 10-30 degrees Celsius lower than the hot spots. This uneven temperature distribution fully exposes the irrationality of existing flow channel designs. In high-temperature areas, the coolant cannot increase its heat absorption capacity in time according to changes in heat, leading to heat accumulation and affecting the performance and stability of the GPU. In low-temperature areas, the coolant flow is not properly distributed, resulting in wasted flow and reducing the overall efficiency of the liquid cooling system.

[0005] Furthermore, under high temperatures, the coolant faces new challenges. High temperatures cause the coolant to generate bubbles. These bubbles accumulate in the flow channels, not only hindering the normal flow of the coolant but also increasing thermal resistance. The increased thermal resistance further reduces the heat dissipation effect, creating a vicious cycle. From the perspective of heat transfer principles, the presence of bubbles disrupts the continuous heat conduction properties of the coolant, adding an extra thermal resistance layer during heat transfer and severely affecting the efficiency of heat transfer from the GPU to the coolant.

[0006] Moreover, the existing fixed flow channel design cannot adjust the flow rate and velocity of the coolant according to the real-time temperature changes in different areas of the GPU. In some cases, even if the overall coolant flow is sufficient, the high-temperature areas still cannot be cooled enough due to the limitations of the flow channel design, while the low-temperature areas have excessive coolant flowing through. This not only wastes energy but also fails to effectively solve the heat dissipation problem.

[0007] Therefore, this invention proposes a multiphase flow adaptive liquid cooling device for servers. Summary of the Invention

[0008] The purpose of this invention is to provide a multiphase flow adaptive liquid cooling device for servers to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a multiphase flow adaptive liquid cooling device for servers, comprising several cold plates, each cold plate having a flow channel inside, each flow channel having a dynamic adjustment component inside, each dynamic adjustment component having several elbows, each elbow being fixedly connected inside the flow channel, a bellows being installed between every two elbows, each bellows having a fixed ring fixedly connected to its surface, each fixed ring having a rack drive member fixedly connected to its surface, each flow channel having several spatial slots matching the number of elbows, each spatial slot having a drive gear rotatably connected to its surface, each drive gear having a bimetallic expansion member installed on its surface, each rack drive member having a gear follower installed on its exterior, each flow channel and spatial slot being filled with a heat-conducting fluid, specifically deionized water, with methylbenzotriazole added to the deionized water for corrosion prevention, two elbows located at the ends of the flow channels being interconnected with an external cooling module, the external cooling module being fixedly connected to the elbows via pipes, the external cooling module being used to provide coolant flow.

[0010] Preferably, all the elbows are fixedly connected to the bends of the flow channel. The two elbows located at the ends of the cold plate are vertically arranged to facilitate connection with the external cooling module. The corrugated pipe between each pair of elbows has its end away from the fixing ring fixedly connected to one side of the elbow, while the surface of the corrugated pipe closer to the fixing ring is fixedly connected with a protrusion. At the same time, a groove is opened inside the opposite elbow. The corrugated pipe is slidably connected to the inside of the corresponding elbow through the protrusion and the groove.

[0011] Preferably, the rack drive element includes:

[0012] The fixing strips are all fixedly connected to the outer surface of the fixing ring;

[0013] Rack 1, which is fixedly connected to the outer surface of the fixed bar near the drive gear;

[0014] Rack 2 is fixedly connected to the outer surface of the fixed bar on the side away from the drive gear.

[0015] Preferably, the bimetallic expansion member comprises:

[0016] A bimetallic strip, which is fixedly connected to the inside of a spatial groove and rotatably connected to the outer surface of a drive gear, is composed of two metals with different coefficients of thermal expansion.

[0017] An abutment post, which is fixedly connected to the bottom of the bimetallic strip;

[0018] A mating groove is formed on the surface of the drive gear, and an abutment post is slidably connected inside the mating groove.

[0019] Preferably, the gear driven member includes:

[0020] Two small gears, both of which are rotatably connected inside the space slot and mesh with the drive gear;

[0021] Half-stroke gear one, all of which are fixedly connected to the bottom of the small gear closest to the drive gear;

[0022] Half-stroke gear two, both of which are fixedly connected to the bottom of the pinion furthest from the drive gear, and the teeth of half-stroke gear two and half-stroke gear one are oriented in opposite directions.

[0023] Preferably, the ratio of the number of teeth of the first half-stroke gear, the first rack, and the second half-stroke gear, the second rack is 1:2.

[0024] Preferably, the bimetallic strip is composed of a nickel-chromium-iron alloy and a nickel-iron alloy, wherein the side closest to the rack is made of nickel-chromium-iron alloy and the other side is made of nickel-iron alloy. When the GPU on the circuit board heats up, the expansion of the nickel-chromium-iron alloy is significantly greater than that of the nickel-iron alloy, causing the bimetallic strip to bend towards the nickel-iron alloy side, triggering the drive gear to rotate. The gear driven component drives the rack driven component to adjust the position of the bellows, thereby achieving adaptive heat dissipation.

[0025] Preferably, each of the cold plates has a circuit board mounted on its exterior, the cold plate is attached to the GPU on the circuit board, and each of the circuit boards has a cabinet mounted on its exterior.

[0026] Preferably, each of the protruding strips is fixedly connected to a dynamic rack, each of the grooves is rotatably connected to a crushing plate, each of the crushing plates is fixedly connected to a dynamic gear that meshes with the dynamic rack, and each of the dynamic gears and the inner wall of the groove is fixedly connected to a return torsion spring.

[0027] Preferably, the crushing plate has a streamlined design on both the side closest to the dynamic rack and the opposite side. The crushing plate is rectangular in shape, with narrow sides on the streamlined sides and wide sides on the other two sides.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. When the GPU's local temperature rises to a high temperature, the bimetallic strip bends due to the difference in expansion. This bending drives the drive gear to rotate. Through the transmission of the gear driven component, the rack drive component moves the fixed ring, which in turn stretches the bellows, widening its inner diameter and increasing the local cross-sectional area of ​​the flow channel. This reduces the coolant flow rate, allowing more coolant to flow to the high-temperature area and fully absorb heat, effectively solving the problem of insufficient heat absorption in the high-temperature area. Conversely, when the GPU's local temperature is low, the bimetallic strip's bending degree decreases or returns to its original shape. The drive gear rotates in the opposite direction, causing the rack drive component to move in the opposite direction. The bellows is compressed, its inner diameter decreases, and the cross-sectional area of ​​the flow channel becomes smaller, increasing the coolant flow rate. This reduces flow waste in the low-temperature area and ensures that the coolant flows preferentially to the high-temperature area, achieving dynamic adjustment of the coolant flow rate and greatly improving the overall heat dissipation efficiency.

[0030] 2. When the GPU on the motherboard heats up and its temperature changes, the bimetallic strip can react quickly due to the significant difference in the thermal expansion coefficients of the two metals. For example, when the GPU temperature rises rapidly, the expansion of the nickel-chromium-iron alloy is significantly greater than that of the nickel-iron alloy. The bimetallic strip begins to bend towards the nickel-iron alloy side in a short time, triggering the drive gear to rotate, and then quickly adjusting the position of the bellows. Compared with traditional heat dissipation adjustment methods, the response speed of this bimetallic strip is greatly improved. It can make adjustments at the first moment of GPU temperature change, effectively avoiding GPU overheating problems caused by untimely response, and ensuring the performance and stability of the GPU.

[0031] 3. When the GPU is under localized high temperature, the ridges on the surface of the bellows move with the movement of the bellows, causing the dynamic rack to move. The dynamic rack meshes with the dynamic gear on the surface of the break plate, causing the break plate to rotate. The reset torsion spring is compressed. At this time, the streamlined side of the break plate rotates, and the wide surface matches the flow direction of the coolant. Its wide surface can break up air bubbles in the coolant, preventing air bubbles from accumulating and increasing thermal resistance. At the same time, it slows down the coolant flow rate, allowing the coolant more time to absorb heat in the localized high temperature area, further improving the heat dissipation effect. When the localized low temperature is reached or the GPU is at normal temperature, the streamlined design of the break plate can reduce the obstruction to the flow of coolant, keep the coolant flowing smoothly, avoid unnecessary pressure loss caused by the break plate, and improve the overall heat dissipation uniformity.

[0032] 4. Traditional server liquid cooling systems are typically complex in structure, difficult to maintain, and may require additional driving sources to achieve certain adjustment functions, increasing energy consumption and the risk of failure. This invention employs a modular design, with the cold plate manufactured in separate upper and lower sections for easy manufacturing and installation. Under this modular manufacturing premise, the dynamic adjustment component can be installed inside the cold plate when the upper and lower plates are assembled together. Furthermore, the cold plate can be welded into a single unit using laser welding. This design makes assembly and maintenance of the device more convenient. Simultaneously, the device uses an internal mechanical structure to achieve self-adjustment, eliminating the need for additional electrical components as a driving source, thus reducing energy consumption and potential points of failure. For example, by utilizing the thermal expansion characteristics of bimetallic strips, gear and rack transmission, and the expansion and contraction of bellows—purely mechanical methods—it achieves functions such as automatically adjusting coolant flow and eliminating air bubbles based on GPU temperature changes, improving the reliability and stability of the device and reducing maintenance and energy costs. Attached Figure Description

[0033] Figure 1 This is a frontal perspective three-dimensional schematic diagram of the main structure of the present invention;

[0034] Figure 2 This is a three-dimensional cross-sectional view of the cold plate of the present invention;

[0035] Figure 3 For the present invention Figure 2 Enlarged 3D schematic diagram of the structure at point A in the middle;

[0036] Figure 4 This is a three-dimensional cross-sectional view of the cold plate and flow channel of the present invention;

[0037] Figure 5 This is a three-dimensional schematic diagram of the elbow and corrugated pipe of the present invention;

[0038] Figure 6 This is a three-dimensional schematic diagram of the elbow, bellows, retaining ring, rack drive component, drive gear, and bimetallic expansion component of the present invention.

[0039] Figure 7 For the present invention Figure 6 Enlarged 3D schematic diagram of the structure at point B in the middle;

[0040] Figure 8 This is a three-dimensional disassembly diagram of the dynamic adjustment component of the present invention;

[0041] Figure 9 For the present invention Figure 8 Enlarged 3D schematic diagram of the structure at point C;

[0042] Figure 10 This is a partial cross-sectional perspective view of the dynamic adjustment component of the present invention;

[0043] Figure 11For the present invention Figure 10 Enlarged 3D schematic diagram of the structure at point D;

[0044] Figure 12 This is a partial cross-sectional perspective view of the dynamic adjustment component of the present invention from another angle.

[0045] In the picture:

[0046] 11. Cold plate; 12. Flow channel; 13. Motherboard; 14. Cabinet.

[0047] 2. Dynamic adjustment component; 21. Elbow; 22. Bellows; 23. Retaining ring; 24. Rack drive component; 241. Retaining bar; 242. Rack one; 243. Rack two; 25. Drive gear; 26. Bimetallic expansion component; 261. Bimetallic strip; 262. Abutting post; 263. Mating groove; 27. Gear driven component; 271. Pinion; 272. Half-stroke gear one; 273. Half-stroke gear two; 28. Dynamic rack; 29. ​​Crushing plate; 210. Dynamic gear; 211. Return torsion spring. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0049] It should be noted that the bimetallic strip 261 only provides the function of bending itself at high temperatures due to the difference in thermal expansion. Its working principle and specific structure are existing technologies. Therefore, given the generality of the above structure, its specific principle will not be described in detail below.

[0050] Please see Figures 1 to 12This invention provides an embodiment of a multiphase flow adaptive liquid cooling device for servers, comprising a plurality of cold plates 11, each cold plate 11 having a flow channel 12 inside, and each flow channel 12 having a dynamic adjustment component 2 inside, each dynamic adjustment component 2 including a plurality of elbows 21, each elbow 21 being fixedly connected inside the flow channel 12, a bellows 22 being installed between every two elbows 21, each bellows 22 having a fixed ring 23 fixedly connected to its surface, and each fixed ring 23 having a rack and pinion actuator 24 fixedly connected to its surface, and each flow channel 12 having a plurality of elbows 21 being fixedly connected to the flow channel 12. The space slots are matched in number 21. Each space slot is rotatably connected to a drive gear 25. Each drive gear 25 is mounted with a bimetallic expansion member 26. Each rack drive member 24 is mounted with a gear driven member 27. Both the flow channel 12 and the space slots are filled with a heat-conducting fluid, specifically deionized water, with methylbenzotriazole added for corrosion prevention. Two elbows 21 located at the ends of the flow channel 12 are connected to an external cooling module. The external cooling module is fixedly connected to the elbows 21 through pipes and is used to provide the function of coolant flow.

[0051] Please refer to the example below. Figures 5 to 7 As shown, the elbows 21 are all fixedly connected to the bends of the flow channel 12. The two elbows 21 located at the ends of the cold plate 11 are vertically arranged to facilitate connection with the external cooling module. The corrugated pipe 22 between each pair of elbows 21 has its end away from the fixing ring 23 fixedly connected to one side of the elbow 21. The corrugated pipe 22 on the side closer to the fixing ring 23 has a protrusion fixedly connected to its surface. At the same time, a groove is opened inside the opposite elbow 21. The corrugated pipe 22 is slidably connected to the inside of the corresponding elbow 21 through the protrusion and the groove.

[0052] It should be noted that the rack driving component 24 includes: a fixing bar 241, all of which are fixedly connected to the outer surface of the fixing ring 23; a rack 242, which is fixedly connected to the outer surface of the fixing bar 241 on the side near the drive gear 25; and a rack 243, which is fixedly connected to the outer surface of the fixing bar 241 on the side away from the drive gear 25. The bimetallic expansion component 26 includes: a bimetallic strip 261, which is fixedly connected to the inside of the space groove and rotatably connected to the outer surface of the drive gear 25, and is composed of two metals with different coefficients of thermal expansion; an abutment post 262, which is fixedly connected to the bottom of the bimetallic strip 261; and a mating groove 263. The gear follower 27 includes: two pinions 271, both of which are rotatably connected to the space slot and mesh with the drive gear 25; a first half-stroke gear 272, both of which are fixedly connected to the bottom of the pinion 271 closest to the drive gear 25; and a second half-stroke gear 273, both of which are fixedly connected to the bottom of the pinion 271 furthest from the drive gear 25. The teeth of the second half-stroke gear 273 and the first half-stroke gear 272 face opposite directions. A motherboard 13 is mounted on the outside of the cold plate 11. The cold plate 11 is attached to the GPU on the motherboard 13, and a cabinet 14 is mounted on the outside of the motherboard 13.

[0053] Please refer to the example below. Figures 10 to 12 As shown, dynamic racks 28 are fixedly connected to the outside of the protrusions, and crushing plates 29 are rotatably connected to the inside of the grooves. Dynamic gears 210 that mesh with dynamic racks 28 are fixedly connected to the surface of crushing plates 29. Reset torsion springs 211 are fixedly connected between dynamic gears 210 and the inner wall of the grooves. The side of crushing plate 29 closest to dynamic racks 28 and the opposite side are streamlined. The crushing plate 29 is rectangular in shape, with narrow sides on its streamlined sides and wide sides on the other two sides. The corrugated tube 22 is made of fluororubber, and the crushing plate 29 is made of 316L stainless steel.

[0054] It should be noted that the gear ratio of half-stroke gear 1 272, rack 1 242 and half-stroke gear 2 273, rack 2 243 is 1:2.

[0055] It should be noted that the bimetallic strip 261 is composed of a nickel-chromium-iron alloy and a nickel-iron alloy. The side closer to the rack 242 is made of nickel-chromium-iron alloy, and the other side is made of nickel-iron alloy. When the GPU on the motherboard 13 heats up and the local temperature rises, the expansion of the nickel-chromium-iron alloy is significantly higher than that of the nickel-iron alloy, forcing the bimetallic strip 261 to bend towards the nickel-iron alloy side.

[0056] This bending deformation drives the drive gear 25 to rotate through the bottom abutment post 262, and then through the two-stage transmission of the gear follower 27 (half-stroke gear one 272 and rack one 242, half-stroke gear two 273 and rack two 243), drives the fixed ring 23 to drive the bellows 22 to alternately compress / stretch.

[0057] It should be noted that the cold plate 11 can be manufactured separately by dividing it into an upper plate and a lower plate. Therefore, under the premise of separate manufacturing, the dynamic adjustment component 2 can be installed inside the cold plate 11 when the upper plate and the lower plate are installed together. At the same time, the cold plate 11 can be welded into a whole by laser welding.

[0058] Specifically, the external cooling module is fixedly connected to the elbow 21 at the end of the flow channel 12 via a pipe, providing power for the circulation of coolant. The coolant flows in from the elbow 21 at one end, flows through several bellows 22, and then flows out from the elbow 21 at the other end, circulating through different cold plates 11. The deionized water filled in the flow channel 12 and the space tank plays a key role. Its good thermal conductivity effectively reduces the thermal resistance between the elbow 21, the bellows 22 and the flow channel 12, ensuring that heat can be efficiently transferred to the coolant.

[0059] When the GPU on the motherboard 13 heats up and the local temperature rises, the bimetallic strip 261 begins to play a regulating role. Since the bimetallic strip 261 is composed of nickel-chromium-iron alloy and nickel-iron alloy, and the side of it near the rack 242 is nickel-chromium-iron alloy while the other side is nickel-iron alloy, under high temperature conditions, the expansion of the nickel-chromium-iron alloy is significantly greater than that of the nickel-iron alloy, causing the bimetallic strip 261 to bend towards the nickel-iron alloy side as a whole.

[0060] The bending of the bimetallic strip 261 causes the bottom abutment post 262 to move synchronously. The abutment post 262 abuts against the mating groove 263 on the surface of the drive gear 25, forcing the drive gear 25 to rotate. The rotation of the drive gear 25 causes the pinion 271 meshing with it to rotate. The half-stroke gear 272 located at the bottom rotates accordingly. The half-stroke gear 272 meshes with the rack 242, causing the rack 242 to move away from the drive gear 25. The rack 242 is connected to the bellows 22 through the fixing strip 241 and the fixing ring 23, thereby causing the bellows 22 to move, compressing it and reducing its inner diameter.

[0061] Due to the drastic temperature changes in the GPU, the bimetallic strip 261 continues to bend, causing the drive gear 25 to rotate continuously. As the pinion 271 rotates, the first half-gear 272 no longer meshes with the first rack 242, and the second half-gear 273 begins to mesh with the second rack 243. The tooth ratio of the first half-gear 272 and the first rack 242, and the second half-gear 273 and the second rack 243 is 1:2. This means that when the second half-gear 273 rotates, the distance that the second rack 243 moves is twice the distance that the first half-gear 272 drives the first rack 242 to move. The second rack 243 pulls the bellows 22 towards the side closer to the drive gear 25 through the fixing bar 241 and the fixing ring 23. The bellows 22 is stretched, and its inner diameter widens.

[0062] After the inner diameter of the bellows 22 is widened, the local cross-sectional area of ​​the flow channel 12 increases, the coolant flow rate decreases, and the flow distribution becomes more uniform. For overheated areas, the reduced flow rate helps the coolant to fully absorb heat and further improves the heat dissipation effect. At the same time, the increased flow rate can also meet the coolant demand in high-temperature areas and achieve precise heat dissipation.

[0063] It should be noted that when the GPU experiences localized low temperatures, the bimetallic strip 261, based on the aforementioned engagement of the half-stroke gear 272 and rack 242, compresses the bellows 22. At this point, the temperature is no longer sufficient for the bimetallic strip 261 to continue bending, so the bellows 22 remains compressed. After compression, the inner diameter of the bellows 22 decreases, and its local cross-sectional area becomes smaller. According to the principle of fluid continuity, under constant flow conditions, a smaller cross-sectional area will increase the coolant flow rate, thereby reducing flow waste in low-temperature areas and ensuring that the coolant flows preferentially to high-temperature areas. This achieves dynamic adjustment of the coolant flow rate and improves overall heat dissipation efficiency.

[0064] Furthermore, when the GPU experiences localized high temperatures, the protrusions on the surface of the bellows 22 move towards the side closer to the drive gear 25 as the bellows 22 moves. The protrusions drive the dynamic rack 28 to move, and the dynamic rack 28 meshes with the dynamic gear 210 on the surface of the break plate 29, causing the break plate 29 to rotate. The reset torsion spring 211 is compressed. At this time, the streamlined side of the break plate 29 rotates, and the wide surface matches the flow direction of the coolant, occupying a certain space and reducing the relative space. The wide surface of the break plate 29 can break up air bubbles in the coolant, preventing air bubbles from accumulating and increasing thermal resistance. At the same time, it slows down the coolant flow rate, allowing the coolant more time to absorb heat in the localized high-temperature area, further improving the heat dissipation effect.

[0065] When the local temperature is low or the GPU is at normal temperature, the streamlined design of the broken plate 29 can reduce the obstruction to the flow of coolant, keep the coolant flowing smoothly, avoid unnecessary pressure loss caused by the broken plate 29, and ensure the efficient and stable operation of the entire liquid cooling system. Moreover, its streamlined design can also guide the coolant to be evenly distributed, prevent the formation of flow dead zones, and allow the coolant to better cover all areas of the GPU, improving the overall heat dissipation uniformity.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multiphase flow adaptive liquid cooling device for servers, comprising a plurality of cold plates (11), each of which has a flow channel (12) inside, characterized in that: Each flow channel (12) is equipped with a dynamic adjustment component (2), each dynamic adjustment component (2) includes several elbows (21), each elbow (21) is fixedly connected to the inside of the flow channel (12), a bellows (22) is installed between every two elbows (21), a fixing ring (23) is fixedly connected to the surface of each bellows (22), a rack drive component (24) is fixedly connected to the surface of each fixing ring (23), a number of space slots matching the number of elbows (21) are opened inside the flow channel (12), a drive gear (25) is rotatably connected inside each space slot, a bimetallic expansion component (26) is installed on the surface of each drive gear (25), a gear driven component (27) is installed on the outside of each rack drive component (24), a heat-conducting fluid is filled in the flow channel (12) and the space slots, and the two elbows (21) at the end of the flow channel (12) are connected to the external cooling module; The elbows (21) are all fixedly connected to the bends of the flow channel (12). The two elbows (21) at the ends of the cold plate (11) are vertically arranged to facilitate connection with the external cooling module. The corrugated pipe (22) between each pair of elbows (21) has its end away from the fixing ring (23) fixedly connected to one side of the elbow (21), while the corrugated pipe (22) on the side closer to the fixing ring (23) has a protrusion fixedly connected to its surface. At the same time, a groove is opened inside the opposite elbow (21). The corrugated pipe (22) is slidably connected to the inside of the corresponding elbow (21) through the protrusion and the groove. The rack drive element (24) includes: Fixing strips (241), each of which is fixedly connected to the outer surface of the fixing ring (23); Rack 1 (242), which is fixedly connected to the outer surface of the fixed bar (241) near the drive gear (25); Rack 2 (243), which is fixedly connected to the outer surface of the fixed bar (241) on the side away from the drive gear (25); The bimetallic expansion member (26) includes: A bimetallic strip (261) is fixedly connected to the inside of the space slot and rotatably connected to the outer surface of the drive gear (25). The bimetallic strip (261) is composed of two metals with different coefficients of thermal expansion. An abutment post (262) is fixedly connected to the bottom of the bimetallic strip (261); A mating groove (263) is formed on the surface of the drive gear (25), and an abutment post (262) is slidably connected inside the mating groove (263); The gear driven member (27) includes: Two pinions (271) are rotatably connected inside the space slot and mesh with the drive gear (25); Half-stroke gear 1 (272), all of which are fixedly connected to the bottom of the pinion (271) closest to the drive gear (25); Half-stroke gear two (273), the half-stroke gear two (273) are all fixedly connected to the bottom of the pinion (271) furthest from the drive gear (25), the teeth of the half-stroke gear two (273) and the half-stroke gear one (272) are facing opposite directions; The bending deformation drives the drive gear (25) to rotate through the abutment post (262) at the bottom, and then drives the fixed ring (23) to drive the bellows (22) to alternately compress / stretch through the two-stage transmission half-stroke gear one (272) and rack one (242), half-stroke gear two (273) and rack two (243) of the gear follower (27).

2. The server multiphase flow adaptive liquid cooling device according to claim 1, characterized in that: The ratio of the number of teeth of the first half-stroke gear (272), the first rack (242), the second half-stroke gear (273), and the second rack (243) is 1:

2.

3. The server multiphase flow adaptive liquid cooling device according to claim 1, characterized in that: The bimetallic strip (261) is composed of a nickel-chromium-iron alloy and a nickel-iron alloy. The side of the bimetallic strip (261) closest to the rack (242) is made of nickel-chromium-iron alloy, while the other side is made of nickel-iron alloy.

4. The server multiphase flow adaptive liquid cooling device according to claim 1, characterized in that: Each cold plate (11) is equipped with a motherboard (13) on its exterior, and each motherboard (13) is equipped with a cabinet (14) on its exterior.

5. A server multiphase flow adaptive liquid cooling device according to claim 1, characterized in that: The outside of each protrusion is fixedly connected to a dynamic rack (28), and the inside of each groove is rotatably connected to a crushing plate (29). The surface of each crushing plate (29) is fixedly connected to a dynamic gear (210) that meshes with the dynamic rack (28). A reset torsion spring (211) is fixedly connected between the dynamic gear (210) and the inner wall of the groove.

6. A server multiphase flow adaptive liquid cooling device according to claim 5, characterized in that: The crushing plate (29) has a streamlined design on both the side closest to the dynamic rack (28) and the opposite side.

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