A data center server liquid cooling system based on bubble cleaning

Abstract

The application discloses a data center server liquid cooling system based on bubble cleaning, which comprises a cooling container, two-phase cooling liquid is contained in the cooling container, a server arranged vertically is soaked in the two-phase cooling liquid, a cooling device is arranged on the top of the cooling container above the two-phase cooling liquid, a bubble cleaning device is arranged on the outer side of the server, the bubble cleaning device comprises a long strip-shaped bubble cleaning member arranged on the outer side surface of the server vertically, and a driving device is arranged to drive the bubble cleaning member to move back and forth in the horizontal direction. The application can realize surface bubble cleaning when the heat generation of the server increases more smoothly, and the heat exchange and cooling effect of the server is improved. Meanwhile, the application can realize automatic operation control, can realize self-adaptive adjustment according to the heat generation, and the overall performance and efficiency of the server are improved.

Description

Technical Field

[0001] This invention relates to the field of data center server cooling technology, and more specifically to a data center server liquid cooling system based on bubble cleaning. Background Technology

[0002] With the leapfrog advancements in digital technology, cloud computing, and intelligent algorithms, global data storage centers are experiencing explosive growth in both size and quantity. Improving server cooling efficiency has been a long-term goal for data centers in order to enhance server computing power and maintain stability.

[0003] Among existing data center server cooling methods, the two-phase coolant immersion cooling method has relatively high cooling efficiency. This involves immersing the server in a two-phase coolant. When the server generates heat, the coolant vaporizes, carrying away the heat. The vapor reaches the top of the cooling chamber and contacts the condenser plate for heat exchange, then re-liquefies and drips down. The condenser plate is connected to a heat exchange device outside the server room, forming a circulating cooling system that transfers heat out of the server room. This cooling method has the advantages of low energy consumption, no noise, and high cooling efficiency. However, during the cooling process, as the heat generated on the server surface increases, bubbles can easily form on the server surface, blocking heat transfer between the server and the coolant, significantly reducing the server's cooling efficiency.

[0004] To address the aforementioned issues, the applicant previously applied for patent CN202511188054.X, which disclosed a high-efficiency immersion-type two-phase liquid cooling method for data center servers. The method features a straight rope or long rod installed along the outer surface of the server. When the ambient temperature reaches a preset temperature, the rope or rod is driven to move back and forth along its length perpendicular to the server's outer surface to remove air bubbles. This invention specifically employs a two-phase liquid cooling system for servers, which can automatically remove air bubbles from the server surface as the temperature rises, thereby improving the server's heat exchange and cooling effect. However, its specific structure involves a horizontally straight rope or long rod installed on the outer surface of the server as an air bubble removal component, which is then driven up and down by an airbag device containing phase change material to remove air bubbles. In this structure, the air bubble removal component is easily affected by buoyancy and the rising force of air bubbles, resulting in poor stability, potential blockage, and a suspended intermediate state, leading to a loss of cleaning effectiveness.

[0005] Therefore, how to better improve the smoothness and effectiveness of bubble removal, and better achieve server cooling, has become a problem that needs further consideration and solution by those skilled in the art. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is: how to provide a data center server liquid cooling system based on bubble cleaning that can more smoothly achieve surface bubble cleaning when the server heat generation increases, so as to better improve the cooling effect and cooling stability of the server.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A data center server liquid cooling system based on bubble cleaning includes a cooling container filled with a two-phase coolant, in which a vertically arranged server is immersed. A cooling device is provided on the top of the cooling container above the two-phase coolant. The system also includes a bubble cleaning device disposed on the outside of the server. The bubble cleaning device is characterized in that it includes an elongated bubble cleaning component disposed vertically on the outer surface of the server, and a driving device for driving the bubble cleaning component to move back and forth in a horizontal direction.

[0008] In this way, the bubble cleaning components are arranged vertically and moved horizontally by a drive device to clean the bubbles. This avoids the defect of losing balance due to buoyancy and bubble rising force, and better ensures the stability and reliability of the operation.

[0009] Furthermore, the bubble cleaning device includes a horizontally arranged lower slide groove along the length of the outer surface of the server to be cleaned, with a sliding block slidably fitted inside the lower slide groove. The lower end of the bubble cleaning component is rotatably connected to the sliding block. The bubble cleaning device also includes a long strip-shaped rocker plate arranged above the outer surface of the server to be cleaned, with the middle of the rocker plate rotatably mounted on a support frame. An upper slide groove is provided on the rocker plate along its length, with both ends of the upper slide groove extending outward beyond the ends of the lower slide groove. An upper slide block is slidably installed inside the upper slide groove. The upper end of the bubble cleaning component is connected to the upper slide block via an elastic rope. A buoyancy block is fixedly provided at one end of the rocker plate, causing that end to form a... The device can maintain an upward-sloping buoyancy end in its initial state while forming a downward-sloping gravity end in its initial state (in practice, the buoyancy of the buoyancy end of the rocker is greater than the sum of the weight of that end and the weight of the upper slider, so that the buoyancy end always maintains its initial upward state); the bubble removal device also includes an airbag device set on one side of the gravity end of the rocker. The airbag device can slide up and down and is fitted onto the vertical guide structure. An airbag is set inside the airbag device, and the airbag is filled with a phase change material. The phase change temperature of the phase change material is within 5 degrees Celsius above and below the phase change temperature of the two-phase coolant. When the airbag in the airbag device is not inflated, the buoyancy is less than its own weight. When the airbag in the airbag device is inflated, the buoyancy is greater than the sum of the weight of the airbag device, the gravity end of the rocker, and the upper slider. The upward floating path of the airbag device has a partial area that vertically overlaps with a partial area of ​​the gravity end of the rocker.

[0010] In the initial state, the rocker arm maintains an upward buoyancy end, and the upper slider slides to the downward gravity end under its own weight. Since the upper slide groove extends beyond the lower slide groove by a certain distance, the lower slider is pulled to the same end of the lower slide groove by the inclined elastic rope. At this time, in the airbag device, when the phase change material inside the airbag has not undergone a thermal phase change, the overall weight of the airbag device is greater than the buoyancy and it is located at the bottom of the cooling container. When the server generates heat exceeding the phase change temperature of the phase change material, the heat is transferred to the airbag through the mounting part, causing the phase change material to undergo a phase change (vaporization or liquefaction). The airbag cavity volume increases, and the airbag expands outward, increasing the buoyancy of the airbag device. When the buoyancy is greater than the weight of the airbag device, the airbag device floats upward. Because the airbag device's buoyancy path partially overlaps with the vertical end of the rocker arm at the gravity end, when the airbag device rises, the gravity end of the rocker arm is lifted upwards. This causes the upper slider to slide downwards along the upper slide groove under gravity to the buoyancy end, and the lower slider is simultaneously pulled to the other end of the lower slide groove by the elastic rope. This process moves the bubble-removing component horizontally, cleaning the air bubbles on the server surface. After the airbag device rises, it exchanges heat with the cooling space at the top of the cooling container and the cooling device above it at the liquid level. The phase change material in the airbag undergoes a retraction phase change (liquefaction or solidification), the airbag skin shrinks, reducing volume and buoyancy, and the airbag device falls back downwards. The rocker arm resets under the action of the buoyancy block, the buoyancy end returns to its upward state, and the upper and lower sliders reset, simultaneously moving the bubble-removing component horizontally to clean the air bubbles on the server surface. Thus, the airbag device is continuously heated, causing the above process to repeat cyclically, achieving bubble removal from the server surface. The up-and-down movement frequency of the airbag device automatically increases with rising temperature, and it also adaptively adjusts to accelerate bubble removal as the temperature rises. Furthermore, compared to the applicant's earlier patent application CN202511188054.X, this solution features a vertically arranged bubble removal component that moves horizontally to achieve cleaning, preventing tilting, jamming, or instability caused by uneven forces at both ends or the upward force of rising bubbles. Since the airbag device is not directly attached to the server, its up-and-down movement is not affected by the impact or interference of bubbles on the server surface. Therefore, the overall operation of the bubble removal device is smoother, more reliable, and more effective at removing bubbles, thus significantly improving the cooling effect on the server.

[0011] Furthermore, the phase change material and the two-phase coolant in the cooling container are identical. This allows for a better achievement of the phase change-following effect.

[0012] Furthermore, the bubble removal component is a rope with a layer of bristles on its outer peripheral surface, with the inner ends of the bristles adhering to the outer surface of the server. This allows for better bubble removal.

[0013] Furthermore, the buoyancy block is internally equipped with an adjustment cavity, and the upper end of the adjustment cavity has an opening with a sealing cover. This allows the sealing cover to be easily opened when needed, and the weight of the buoyancy block can be adjusted by adding material into the adjustment cavity, thereby adjusting the magnitude of the resultant buoyant force acting on it, to better ensure smooth vertical movement.

[0014] Furthermore, the length of the sliding groove is the same as the length along the outer surface of the server to be cleaned. This ensures that all side areas of the server are cleaned.

[0015] Furthermore, the upper and lower surfaces of the inner cavity of the sliding groove are concave structures, and the sliding block is a disc-shaped component vertically arranged along the direction of the server surface to be cleaned and slidably engaged within the sliding groove. The axis at the outer end of the sliding block extends outward beyond the outer surface of the server to be cleaned and connects to the lower end of the bubble removal component. This facilitates the installation and sliding force of the sliding block, and better improves the reliability of the working sliding.

[0016] Furthermore, a bubble cleaning component is provided on each of the two opposite outer surfaces in the width direction of the server. A sliding groove and a corresponding sliding block are provided below each bubble cleaning component. The upper ends of the bubble cleaning components on both sides are connected to the upper sliding block in the same rocker plate at the upper center of the server by elastic pull ropes.

[0017] In this way, by using a rocker and a corresponding upper slider, the opposite sides of the server can be moved simultaneously to remove air bubbles.

[0018] Furthermore, the upper sliding groove is formed vertically through the middle position of the rocker plate, and a roller mating groove is formed by the concave left and right sides of the inner wall of the upper sliding groove. The upper slider is mated in the upper sliding groove and horizontal rollers are provided on the left and right sides. The outer ends of the rollers can be rolled and engaged in the roller mating groove.

[0019] This design ensures stable force distribution on the upper slider structure, and the rolling action facilitates smoother sliding of the upper slider on the rocker, reducing frictional resistance.

[0020] Furthermore, a lever is provided extending outward from the lower part of the gravity end of the rocker and the lower part of the opposite side of the airbag device, with the two levers overlapping in the vertical direction.

[0021] In this way, the airbag device moves the rocker plate by two paddles, avoiding interference with the movement of the upper slider.

[0022] Furthermore, a first permanent magnet is provided on the inner side of the paddle on the airbag device, and a second permanent magnet is provided on the upper slider that protrudes from the upper groove. When the two paddles come into contact, the first permanent magnet and the second permanent magnet are located in the interacting magnetic field and are arranged with the same poles repelling each other.

[0023] In this way, after the airbag device floats up, when the lever pushes the rocker upwards at the gravity end, the upper slider is simultaneously subjected to gravity and the repulsive force of the permanent magnet. The repulsive force of the permanent magnet is used to push the upper slider to slide to the other end more smoothly over the force balance point of the elastic rope, and thus can drive the lower slider to move to the other end more smoothly.

[0024] Furthermore, the support frame includes two lower gantry frames installed on the outer surfaces of the two sides of the server to be cleaned, and an upper gantry frame installed above the space between the two lower gantry frames. The upper gantry frame is installed along the width between the two lower gantry frames, and the rocker arm is rotatably installed in the middle of the upper gantry frame. Each of the two lower gantry frames has a vertically extending limiting groove on its upper inner side along its length, and the elastic pull rope passes through the limiting groove.

[0025] This not only facilitates the installation and setup of the support frame, but also limits the distance between the bubble cleaning component and the server surface, ensuring that it precisely handles the contact state of the brush bristles, thus preventing the bubble cleaning component from being pressed tightly against the server surface, which would cause frictional obstruction and wear.

[0026] Furthermore, the airbag device includes a sliding sleeve, which is vertically slidably fitted onto a vertically fixed airbag slide rod and forms the vertical guide structure. A metal mesh cover, which is integrally vertically cylindrical, is provided outside the sliding sleeve, and the airbag is located inside the metal mesh cover.

[0027] In this way, the metal mesh can limit the shape of the airbag after it expands, preventing it from deforming and causing blockage. At the same time, the airbag slide rod guides and limits the up and down movement of the airbag device, thus improving the smoothness of the up and down movement.

[0028] Furthermore, the upper end of the airbag device is provided with a horizontal upper heat-conducting plate. The upper ends of the sliding sleeve and the metal mesh cover are respectively connected to the inner and outer sides of the upper heat-conducting plate. The upper top of the inner cavity of the cooling container has a downward heat transfer boss made of heat-conducting material corresponding to the upper heat-conducting plate. After the airbag device floats to the upper end of the airbag slide rod, the upper surface of the upper heat-conducting plate and the lower surface of the heat transfer boss can be in contact.

[0029] In this way, when the airbag device floats to the top of the airbag slide rod, it can rely on the contact between the upper heat-conducting plate and the heat transfer boss to exchange heat with the cooling device at the top of the cooling container more efficiently and release heat, thus achieving up-and-down movement cycles more efficiently and quickly.

[0030] Furthermore, the upper side of the airbag is bonded and fixed to the upper heat-conducting plate. This allows the heat or cold absorbed by the upper heat-conducting plate to be better transferred to the interior of the airbag.

[0031] Furthermore, the lower end of the airbag device is provided with a horizontal lower heat-conducting plate, and the bottom of the inner cavity of the cooling container has a heat-conducting base plate made of heat-conducting material corresponding to the lower heat-conducting plate, which extends horizontally and connects to the bottom of the server.

[0032] In this way, when the airbag device sinks to the lower end of the airbag slide rod, it can rely on the contact between the lower heat-conducting plate and the heat-conducting base plate to achieve heat exchange with the server more efficiently, and can achieve up and down movement cycle more efficiently and quickly.

[0033] Furthermore, the lower side of the airbag is bonded and fixed to the lower heat-conducting plate (when the middle part of the airbag is not inflated, it contracts and adheres to the middle sliding sleeve). In this way, the heat or cold absorbed by the lower heat-conducting plate can be better transferred to the inside of the airbag.

[0034] Furthermore, the metal mesh cover has an upper half and a lower half, with multiple outwardly curved shape memory alloy connecting strips spaced circumferentially between the upper and lower half. When the shape memory alloy connecting strips reach the shape memory deformation temperature, they can extend into a vertical state. The shape memory deformation temperature is greater than (slightly greater than 0-5 degrees Celsius) the phase change temperature of the phase change material inside the airbag. When the shape memory alloy connecting strips are extended into a curved state, the buoyancy of the airbag device (the airbag is in an inflated state) is less than the gravity. When the shape memory alloy connecting strips are extended into a vertical state, the volume of the metal mesh cover increases, making the buoyancy of the airbag device greater than the gravity.

[0035] In this way, when the airbag device is located at the lower end, its size is initially limited by the metal mesh cover when it begins to expand due to heat. Once the airbag reaches the inherent size of the metal mesh cover, it stops expanding and accumulates expansion pressure. It needs to wait until the airbag device continues to heat up and reaches its shape memory temperature before the shape memory alloy connecting strip deforms into a vertical position. The metal mesh cover increases in volume, and the airbag expands violently under the continued expansion pressure, rapidly increasing buoyancy and exceeding its own weight. Thus, the airbag device begins to float under a large buoyancy, enabling it to rise quickly with an initial velocity and lift the gravity end of the rocker, moving the bubble removal component horizontally to remove bubbles from the server surface. This shape memory alloy connecting strip design avoids the drawback of the airbag device starting to float as soon as its buoyancy exceeds the gravity balance line, which is not only slow but also prone to becoming suspended. This better ensures the stability and smoothness of the bubble removal device's operation.

[0036] Furthermore, the heat transfer boss and the upper heat-conducting plate are respectively provided with ferromagnetic materials that can attract each other.

[0037] In this way, when the airbag absorbs cold air at the upper position, the airbag needs to contract, and the buoyancy needs to decrease to a certain amount less than its own weight (i.e., the magnitude of the attraction force of the ferromagnetic material) before the airbag can detach from the heat transfer boss and move downward under its own weight. This avoids the problem of the airbag starting to descend as soon as it contracts to a point where the buoyancy is less than its own weight, thus preventing slow descent or suspension.

[0038] Furthermore, the cooling device includes a horizontally arranged cooling top plate and heat exchange coils embedded in the cooling top plate. The heat exchange coils are connected to a heat dissipation device located outside the computer room to form a heat exchange cycle. This allows for better heat transfer to the outside of the computer room for release.

[0039] In summary, this invention can more smoothly remove surface bubbles when the server heats up, thus improving the server's heat exchange and cooling effect. It also has the advantages of automatic operation control and adaptive adjustment based on heat generation, thereby improving the overall performance and efficiency of the server. Attached Figure Description

[0040] Figure 1 This is a three-dimensional structural diagram of the data center server liquid cooling system based on bubble cleaning used in this invention.

[0041] Figure 2 for Figure 1 The front view.

[0042] Figure 3 for Figure 1 A three-dimensional structural diagram of the slider and rocker alone, with the rocker in a broken cross-section.

[0043] Figure 4 for Figure 3 Side view.

[0044] Figure 5 for Figure 1 A schematic diagram of the structure of a single airbag device.

[0045] Figure 6 This is a schematic diagram of the airbag device after the metal mesh cover has been removed. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0047] Best practice: See Figure 1-6As shown, a data center server liquid cooling system based on bubble cleaning includes a cooling container 1 containing a two-phase coolant. A vertically arranged server 2 is immersed in the two-phase coolant. A cooling device (not shown) is installed on the top of the cooling container above the two-phase coolant. The system also includes a bubble cleaning device installed on the outside of the server. The bubble cleaning device includes a long strip-shaped bubble cleaning component 3 vertically arranged on the outer surface of the server, and a driving device for driving the bubble cleaning component to move back and forth in the horizontal direction.

[0048] In this way, the bubble cleaning components are arranged vertically and moved horizontally by a drive device to clean the bubbles. This avoids the defect of losing balance due to buoyancy and bubble rising force, and better ensures the stability and reliability of the operation.

[0049] The bubble cleaning device includes a horizontally arranged sliding groove 4 along the length of the outer surface of the server to be cleaned, with a sliding block 5 slidably fitted inside the sliding groove 4. The lower end of the bubble cleaning component 3 is rotatably connected to the sliding block 5. The bubble cleaning device also includes a long, narrow rocker 6 arranged above the outer surface of the server to be cleaned, with the middle of the rocker 6 rotatably mounted on a support frame 7. An upper sliding groove 8 is provided along the length of the rocker 6, extending outwards beyond the ends of the sliding groove by a certain distance. An upper sliding block 9 is slidably installed inside the upper sliding groove 8. The upper end of the bubble cleaning component is connected to the upper sliding block 9 via an elastic rope 10. A buoyancy block 11 is fixedly installed at one end of the rocker 6, causing... One end forms a buoyancy end that maintains an initial upward tilt, while the other end forms a gravity end that maintains an initial downward tilt (in practice, the buoyancy of the buoyancy end of the rocker is greater than the sum of the gravity of that end and the gravity of the upper slider, so that the buoyancy end always maintains its initial upward tilt); the bubble removal device also includes an airbag device set on one side of the gravity end of the rocker. The airbag device can slide up and down and is fitted onto the vertical guide structure. An airbag 12 is set inside the airbag device, and the airbag 12 is filled with a phase change material. The phase change temperature of the phase change material is within 5 degrees Celsius above and below the phase change temperature of the two-phase coolant. When the airbag 12 in the airbag device is not inflated, the buoyancy is less than its own weight. When the airbag 12 in the airbag device is inflated, the buoyancy is greater than the sum of the gravity of the airbag device, the gravity end of the rocker, and the upper slider. The upward floating path of the airbag device has a partial area that vertically overlaps with a partial area of ​​the gravity end of the rocker.

[0050] In the initial state, the rocker arm maintains an upward buoyancy end, and the upper slider slides to the downward gravity end under its own weight. Since the upper slide groove extends beyond the lower slide groove by a certain distance, the lower slider is pulled to the same end of the lower slide groove by the inclined elastic rope. At this time, in the airbag device, when the phase change material inside the airbag has not undergone a thermal phase change, the overall weight of the airbag device is greater than the buoyancy and it is located at the bottom of the cooling container. When the server generates heat exceeding the phase change temperature of the phase change material, the heat is transferred to the airbag through the mounting part, causing the phase change material to undergo a phase change (vaporization or liquefaction). The airbag cavity volume increases, and the airbag expands outward, increasing the buoyancy of the airbag device. When the buoyancy is greater than the weight of the airbag device, the airbag device floats upward. Because the airbag device's buoyancy path partially overlaps with the vertical end of the rocker arm at the gravity end, when the airbag device rises, the gravity end of the rocker arm is lifted upwards. This causes the upper slider to slide downwards along the upper slide groove under gravity to the buoyancy end, and the lower slider is simultaneously pulled to the other end of the lower slide groove by the elastic rope. This process moves the bubble-removing component horizontally, cleaning the air bubbles on the server surface. After the airbag device rises, it exchanges heat with the cooling space at the top of the cooling container and the cooling device above it at the liquid level. The phase change material in the airbag undergoes a retraction phase change (liquefaction or solidification), the airbag skin shrinks, reducing volume and buoyancy, and the airbag device falls back downwards. The rocker arm resets under the action of the buoyancy block, the buoyancy end returns to its upward state, and the upper and lower sliders reset, simultaneously moving the bubble-removing component horizontally to clean the air bubbles on the server surface. Thus, the airbag device is continuously heated, causing the above process to repeat cyclically, achieving bubble removal from the server surface. The up-and-down movement frequency of the airbag device automatically increases with rising temperature, and it also adaptively adjusts to accelerate bubble removal as the temperature rises. Furthermore, compared to the applicant's earlier patent application CN202511188054.X, this solution features a vertically arranged bubble removal component that moves horizontally to achieve cleaning, preventing tilting, jamming, or instability caused by uneven forces at both ends or the upward force of rising bubbles. Since the airbag device is not directly attached to the server, its up-and-down movement is not affected by the impact or interference of bubbles on the server surface. Therefore, the overall operation of the bubble removal device is smoother, more reliable, and more effective at removing bubbles, thus significantly improving the cooling effect on the server.

[0051] The phase change material and the two-phase coolant in the cooling container are identical. This allows for better tracking of the phase change.

[0052] The bubble-removing component 3 is a rope with a layer of bristles on its outer circumferential surface, with the inner ends of the bristles adhering to the outer surface of the server. This allows for better bubble removal.

[0053] The buoyancy block 11 has an adjustment cavity inside, with an opening at the upper end and a sealing cover installed on the opening. This allows the sealing cover to be easily opened when needed, and the weight of the buoyancy block can be adjusted by adding material into the adjustment cavity, thereby adjusting the magnitude of the resultant buoyancy force acting on it to better ensure smooth vertical movement.

[0054] The length of the sliding groove 4 is the same as the length along the outer surface of the server to be cleaned. This ensures that all side areas of the server can be cleaned.

[0055] The sliding groove 4 has concave upper and lower surfaces. The sliding block 5 is a disc-shaped component vertically positioned along the surface to be cleaned on the server and slidably engaged within the sliding groove. The outer end of the sliding block 5 extends outward beyond the outer surface of the server to be cleaned and connects to the lower end of the bubble removal component 3. This design facilitates the installation and sliding force of the sliding block, thus improving the reliability of the sliding operation.

[0056] Among them, a bubble cleaning component 3 is provided on each of the two opposite outer surfaces in the width direction of the server. A sliding groove and a corresponding sliding block are provided below each bubble cleaning component. The upper ends of the two bubble cleaning components are respectively connected to the upper sliding block 9 in the same rocker plate at the upper center of the server by elastic pull ropes 10.

[0057] In this way, by using a rocker and a corresponding upper slider, the opposite sides of the server can be moved simultaneously to remove air bubbles.

[0058] The upper slide groove 8 is formed vertically through the middle of the rocker plate 6. A roller mating groove is formed by the indentation on the left and right sides of the inner wall of the upper slide groove. The upper slide block is mated in the upper slide groove and horizontal rollers 14 are provided on the left and right sides. The outer end of the roller 14 can be rolled and engaged in the roller mating groove.

[0059] This design ensures stable force distribution on the upper slider structure, and the rolling action facilitates smoother sliding of the upper slider on the rocker, reducing frictional resistance.

[0060] Among them, a lever 15 is provided on the lower part of the gravity end of the rocker and on the lower part of the opposite side of the airbag device, and the two levers 15 overlap in the vertical direction.

[0061] In this way, the airbag device moves the rocker plate by two paddles, avoiding interference with the movement of the upper slider.

[0062] The airbag device has a first permanent magnet 16 inside the paddle and a second permanent magnet 17 exposed in the upper slide groove on the upper slider. When the two paddles are in contact, the first permanent magnet 16 and the second permanent magnet 17 are located in the interacting magnetic field and are set with the same poles repelling each other.

[0063] In this way, after the airbag device floats up, when the lever pushes the rocker upwards at the gravity end, the upper slider is simultaneously subjected to gravity and the repulsive force of the permanent magnet. The repulsive force of the permanent magnet is used to push the upper slider to slide to the other end more smoothly over the force balance point of the elastic rope, and thus can drive the lower slider to move to the other end more smoothly.

[0064] The support frame 7 includes two lower gantry frames 19 installed on the outer surfaces of the server to be cleaned on both sides, and an upper gantry frame 20 installed above the two lower gantry frames. The upper gantry frame is installed along the width between the two lower gantry frames, and the rocker arm is rotatably installed in the middle of the upper gantry frame. Each of the two lower gantry frames has a vertically penetrating limiting groove on its upper inner side along the length direction, and the elastic pull rope 10 passes through the limiting groove.

[0065] This not only facilitates the installation and setup of the support frame, but also limits the distance between the bubble cleaning component and the server surface, ensuring that it precisely handles the contact state of the brush bristles, thus preventing the bubble cleaning component from being pressed tightly against the server surface, which would cause frictional obstruction and wear.

[0066] The airbag device includes a sliding sleeve 21, which is vertically slidably mounted on a vertically fixed airbag slide rod 22 and forms the vertical guide structure. A metal mesh cover 23 in the shape of a vertical cylinder is provided outside the sliding sleeve, and the airbag 12 is located inside the metal mesh cover 23.

[0067] In this way, the metal mesh can limit the shape of the airbag after it expands, preventing it from deforming and causing blockage. At the same time, the airbag slide rod guides and limits the up and down movement of the airbag device, thus improving the smoothness of the up and down movement.

[0068] The airbag device has a horizontal upper heat-conducting plate 24 at its upper end. The upper ends of the sliding sleeve 21 and the metal mesh cover 23 are respectively connected to the inner and outer sides of the upper heat-conducting plate 24. The upper top of the inner cavity of the cooling container has a downward heat transfer protrusion 25 made of heat-conducting material corresponding to the upper heat-conducting plate. After the airbag device floats to the upper end of the airbag slide rod, the upper surface of the upper heat-conducting plate and the lower surface of the heat transfer protrusion 25 can be attached.

[0069] In this way, when the airbag device floats to the top of the airbag slide rod, it can rely on the contact between the upper heat-conducting plate and the heat transfer boss to exchange heat with the cooling device at the top of the cooling container more efficiently and release heat, thus achieving up-and-down movement cycles more efficiently and quickly.

[0070] The upper side of the airbag 12 is bonded and fixed to the upper heat-conducting plate 24. This allows the heat or cold absorbed by the upper heat-conducting plate to be better transferred to the interior of the airbag.

[0071] The airbag device has a horizontal lower heat-conducting plate 26 at its lower end, and the bottom of the cooling container cavity has a heat-conducting base plate 27 made of heat-conducting material corresponding to the lower heat-conducting plate. The heat-conducting base plate 27 extends horizontally and connects to the bottom of the server.

[0072] In this way, when the airbag device sinks to the lower end of the airbag slide rod, it can rely on the contact between the lower heat-conducting plate and the heat-conducting base plate to achieve heat exchange with the server more efficiently, and can achieve up and down movement cycle more efficiently and quickly.

[0073] The lower side of the airbag 12 is bonded and fixed to the lower heat-conducting plate 26 (when the middle part of the airbag is not inflated, it contracts and fits against the middle sliding sleeve). In this way, the heat or cold absorbed by the lower heat-conducting plate can be better transferred to the inside of the airbag.

[0074] The metal mesh cover 23 has an upper half and a lower half. Multiple outwardly curved shape memory alloy connecting strips 30 are arranged circumferentially between the upper half and the lower half. When the shape memory alloy connecting strips 30 reach the shape memory deformation temperature, they can extend into a vertical state. The shape memory deformation temperature is greater than (slightly greater than 0-5 degrees Celsius) the phase change temperature of the phase change material inside the airbag. When the shape memory alloy connecting strips are extended into a curved state, the buoyancy of the airbag device (the airbag is in an inflated state) is less than the gravity. When the shape memory alloy connecting strips are extended into a vertical state, the volume of the metal mesh cover increases, which makes the buoyancy of the airbag device greater than the gravity.

[0075] In this way, when the airbag device is located at the lower end, its size is initially limited by the metal mesh cover when it begins to expand due to heat. Once the airbag reaches the inherent size of the metal mesh cover, it stops expanding and accumulates expansion pressure. It needs to wait until the airbag device continues to heat up and reaches its shape memory temperature before the shape memory alloy connecting strip deforms into a vertical position. The metal mesh cover increases in volume, and the airbag expands violently under the continued expansion pressure, rapidly increasing buoyancy and exceeding its own weight. Thus, the airbag device begins to float under a large buoyancy, enabling it to rise quickly with an initial velocity and lift the gravity end of the rocker, moving the bubble removal component horizontally to remove bubbles from the server surface. This shape memory alloy connecting strip design avoids the drawback of the airbag device starting to float as soon as its buoyancy exceeds the gravity balance line, which is not only slow but also prone to becoming suspended. This better ensures the stability and smoothness of the bubble removal device's operation.

[0076] The heat transfer boss 25 and the upper heat-conducting plate 24 are respectively provided with ferromagnetic materials that can attract each other.

[0077] In this way, when the airbag absorbs cold air at the upper position, the airbag needs to contract, and the buoyancy needs to decrease to a certain amount less than its own weight (i.e., the magnitude of the attraction force of the ferromagnetic material) before the airbag can detach from the heat transfer boss and move downward under its own weight. This avoids the problem of the airbag starting to descend as soon as it contracts to a point where the buoyancy is less than its own weight, thus preventing slow descent or suspension.

[0078] The cooling system includes a horizontally arranged cooling top plate and heat exchange coils embedded in the cooling top plate. The heat exchange coils are connected to a heat dissipation device located outside the computer room to form a heat exchange cycle (not shown in the figure). This allows for better heat dissipation to the outside of the computer room.

Claims

1. A data center server liquid cooling system based on bubble removal, comprising a cooling container containing a two-phase coolant, a vertically arranged server immersed in the two-phase coolant, a cooling device mounted on top of the cooling container above the two-phase coolant, and a bubble removal device mounted on the outside of the server, characterized in that, The bubble cleaning device includes a long strip-shaped bubble cleaning component that is vertically arranged on the outer surface of the server, and a driving device for driving the bubble cleaning component to move back and forth in the horizontal direction. The bubble cleaning device includes a horizontally positioned lower slide groove along the length of the outer surface of the server to be cleaned, with a sliding block slidably fitted within the groove. The lower end of the bubble cleaning component is rotatably connected to the sliding block. The device also includes a long, narrow rocker arm positioned above the outer surface of the server to be cleaned, with its center rotatably mounted on a support frame. An upper slide groove is provided along the length of the rocker arm, extending outwards beyond the ends of the lower slide groove. An upper sliding block is slidably fitted within the upper slide groove. The upper end of the bubble cleaning component is connected to the upper sliding block via an elastic cord. One end is fixedly equipped with a buoyancy block, forming a buoyancy end that maintains an initial upward tilt, while the other end forms a gravity end that maintains an initial downward tilt. The bubble removal device also includes an airbag device set on one side of the gravity end of the rocker. The airbag device can slide up and down and is fitted onto the vertical guide structure. An airbag is set inside the airbag device, and the airbag is filled with a phase change material. The phase change temperature of the phase change material is within 5 degrees Celsius above and below the phase change temperature of the two-phase coolant. When the airbag in the airbag device is not inflated, the buoyancy is less than its own weight. When the airbag in the airbag device is inflated, the buoyancy is greater than the sum of the weight of the airbag device, the gravity end of the rocker, and the upper slider. The upward floating path of the airbag device has a partial area that vertically overlaps with a partial area of ​​the gravity end of the rocker.

2. The data center server liquid cooling system based on bubble cleaning according to claim 1, characterized in that, The phase change material is the same as the two-phase coolant in the cooling container.

3. The data center server liquid cooling system based on bubble removal according to claim 1, characterized in that, The bubble cleaning component is a rope with a layer of bristles on its outer circumferential surface, with the inner ends of the bristles attached to the outer surface of the server.

4. The data center server liquid cooling system based on bubble cleaning according to claim 1, characterized in that, The buoyancy block has an adjustment cavity inside, and an opening is provided at the upper end of the adjustment cavity, with a sealing cover installed on the opening.

5. The data center server liquid cooling system based on bubble cleaning according to claim 1, characterized in that, The length of the slide groove is the same as the length along the outer surface of the server to be cleaned; The upper and lower surfaces of the inner cavity of the sliding groove are concave. The sliding block is a disc-shaped part that is vertically arranged along the direction of the server surface to be cleaned and is slidably engaged in the sliding groove. The axis of the outer end of the sliding block extends outward beyond the position of the outer surface of the server to be cleaned and is connected to the lower end of the bubble cleaning component.

6. The data center server liquid cooling system based on bubble cleaning according to claim 1, characterized in that, On the outer surfaces of the two opposite sides of the server, there is a bubble cleaning component. Below each bubble cleaning component, there is a sliding groove and a corresponding sliding block. The upper ends of the bubble cleaning components on both sides are connected to the upper slide block in the same rocker plate at the upper center of the server by elastic pull ropes.

7. The data center server liquid cooling system based on bubble cleaning according to claim 1, characterized in that, The upper sliding groove is formed vertically through the middle of the rocker plate. The inner wall of the upper sliding groove is recessed on both the left and right sides to form a roller mating groove. The upper slider is mated in the upper sliding groove and horizontal rollers are provided on the left and right sides. The outer ends of the rollers can be rolled and engaged in the roller mating groove.

8. The data center server liquid cooling system based on bubble cleaning according to claim 1, characterized in that, A lever is provided below the gravity end of the rocker and on the lower part of the opposite side of the airbag device, with the two levers overlapping in the vertical direction. The inner side of the paddle on the airbag device is also provided with a first permanent magnet, and the upper slider is also provided with a second permanent magnet exposed in the upper groove. When the two paddles are in contact, the first permanent magnet and the second permanent magnet are located in the interacting magnetic field and are arranged with the same poles repelling each other. The support frame includes two lower gantry frames installed on the outer surfaces of the server to be cleaned on both sides, and an upper gantry frame installed above the space between the two lower gantry frames. The upper gantry frame is installed along the width between the two lower gantry frames, and a rocker arm is rotatably installed in the middle of the upper gantry frame. Each of the two lower gantry frames has a vertically extending limiting groove on its upper inner side along its length, and the elastic pull rope passes through the limiting groove.

9. The data center server liquid cooling system based on bubble cleaning according to claim 1, characterized in that, The airbag device includes a sliding sleeve, which is vertically slidably mounted on a vertically fixed airbag slide rod and forms the vertical guide structure. A metal mesh cover in the shape of a vertical cylinder is provided outside the sliding sleeve, and the airbag is located inside the metal mesh cover. The upper end of the airbag device is provided with a horizontal upper heat-conducting plate. The upper ends of the sliding sleeve and the metal mesh cover are respectively connected to the inner and outer sides of the upper heat-conducting plate. The upper top of the inner cavity of the cooling container has a downward heat transfer boss made of heat-conducting material corresponding to the upper heat-conducting plate. After the airbag device floats to the upper end of the airbag slide rod, the upper surface of the upper heat-conducting plate and the lower surface of the heat transfer boss can be in contact. The upper side of the airbag is bonded and fixed to the upper heat-conducting plate; The lower end of the airbag device is provided with a horizontal lower heat-conducting plate, and the bottom of the inner cavity of the cooling container has a heat-conducting base plate made of heat-conducting material corresponding to the lower heat-conducting plate. The heat-conducting base plate extends horizontally and connects with the bottom of the server. The lower side of the airbag is bonded and fixed to the lower heat-conducting plate; The metal mesh cover has an upper cover and a lower cover. Multiple outwardly curved shape memory alloy connecting strips are circumferentially spaced between the upper and lower covers. When the shape memory alloy connecting strips reach their shape memory deformation temperature, they can extend into a vertical state. This shape memory deformation temperature is greater than the phase change temperature of the phase change material inside the airbag. When the shape memory alloy connecting strips are extended into a curved state, the buoyancy of the airbag device is less than its weight. When the shape memory alloy connecting strips are extended into a vertical state, the volume of the metal mesh cover increases, making the buoyancy of the airbag device greater than its weight. The heat transfer boss and the upper heat-conducting plate are respectively provided with ferromagnetic materials that can attract each other. The cooling device includes a horizontally arranged cooling top plate and heat exchange coils embedded in the cooling top plate. The heat exchange coils are connected to the heat dissipation device located outside the computer room to form a heat exchange cycle.

Images