An immersion liquid cooling circulating system and an immersion liquid cooling cabinet

Abstract

The application discloses an immersed liquid cooling circulating system and an immersed liquid cooling cabinet, which comprise a first shell, a second shell, a first flow channel and a second flow channel; the second shell has an open inner cavity, a partition plate is arranged in the inner cavity, and the partition plate divides the inner cavity into a liquid cooling cavity and an overflow groove; the first flow channel is communicated with the liquid cooling cavity; the second flow channel is communicated with the overflow groove, the first flow channel has a first inlet, the second flow channel has a first outlet and a balance port, the heights of the first outlet, the first inlet and the balance port are sequentially reduced, and the balance port is communicated with an external liquid storage container. After the balance ports are connected to the same external liquid storage container, the liquid levels in the liquid cooling cavities of all the cabinets automatically tend to be consistent based on the principle of a communicating vessel, liquid level sensors and a corresponding control system need not be arranged on the cabinets, the hardware cost of the system is reduced, the reliability risk caused by sensor failure or abnormal control logic is eliminated, and the control mode is more simple and reliable.

Description

Technical Field

[0001] This invention relates to the field of server heat dissipation technology, and in particular to an immersion liquid cooling circulation system and an immersion liquid cooling cabinet. Background Technology

[0002] Immersion liquid cooling technology involves directly immersing servers and other electronic equipment in a coolant, removing heat through direct heat exchange between the liquid and the equipment. This offers significant advantages such as high heat dissipation efficiency, low energy consumption, and low noise. With the continuous increase in data center computing density and energy consumption pressure, single-phase immersion liquid cooling technology, as a highly efficient, green, and energy-saving data center cooling solution, is receiving increasing attention and application. Global investment in liquid-cooled data centers has steadily increased since 2017, and single-phase immersion liquid cooling is currently in an evolutionary stage of "continuously advancing small-scale commercial applications," with the industry chain rapidly developing and maturing.

[0003] Existing immersion liquid-cooled cabinets typically have a supply port and a return port. The supply port delivers coolant into the cabinet, while the return port discharges the heated coolant to an external cooling unit for further cooling; together, they form a basic circulation loop. In multi-cabinet parallel deployments, differences in cooling load, piping resistance, and supply pressure among the cabinets can easily lead to inconsistent coolant levels. To maintain stable coolant levels in each cabinet, current solutions usually require installing level sensors in each cabinet and using a control system to dynamically balance the coolant levels across cabinets by real-time regulation of the circulation pumps or regulating valves. This approach not only increases hardware costs and system complexity but also introduces additional potential failure points. The control logic is cumbersome, response is delayed, and it struggles to adapt to rapidly changing load conditions. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention proposes an immersion liquid cooling circulation system and an immersion liquid cooling cabinet.

[0005] This invention proposes an immersion liquid-cooled cabinet, comprising: a first housing, a second housing, a first flow channel, and a second flow channel; the second housing is disposed within the first housing, forming an isolation space between the second housing and the first housing, the isolation space being used to isolate the second housing from the external environment; the second housing has an open inner cavity, within which a partition is disposed, dividing the inner cavity into a liquid-cooled cavity and an overflow tank; the top of the partition is lower than the top open edge of the inner cavity so that the liquid-cooled cavity and the overflow tank are connected above the partition; the first flow channel communicates with the liquid-cooled cavity and is used to deliver coolant to the liquid-cooled cavity; the second flow channel... The first flow channel is connected to the overflow tank and is used to discharge the coolant that overflows from the liquid cooling chamber into the overflow tank. The first flow channel has a first inlet, and the second flow channel has a first outlet and a balance port. The heights of the first outlet, the first inlet, and the balance port decrease sequentially. The balance port is connected to an external liquid storage container and is used to guide the coolant in the overflow tank to the external liquid storage container through the balance port when the liquid level in the liquid cooling chamber is higher than the preset liquid level. When the liquid level in the liquid cooling chamber is lower than the preset liquid level, the liquid in the external liquid storage container flows back into the liquid cooling chamber through the balance port to achieve automatic balance of the liquid level in the liquid cooling chamber.

[0006] Preferably, the preset liquid level is matched with the height of the balance port so that when the liquid level in the liquid cooling chamber is higher than the balance port, the coolant is discharged outward through the balance port; when the liquid level in the liquid cooling chamber is lower than the balance port, the liquid in the external liquid storage container flows back into the liquid cooling chamber through the balance port.

[0007] Preferably, the second flow channel includes an outlet pipe and a balance pipe. The first end of the outlet pipe is connected to the overflow tank, and the second end of the outlet pipe is connected to the first outlet. The connection between the outlet pipe and the overflow tank forms a first connection part. The first end of the balance pipe is connected to the overflow tank, and the second end of the balance pipe is connected to the balance port. The connection between the balance pipe and the overflow tank forms a second connection part. The first connection part and the second connection part are located at the same height.

[0008] Preferably, the heights of both the first connecting portion and the second connecting portion are higher than the height of the first outlet.

[0009] Preferably, the first flow channel includes an inlet pipe and several branch pipes; the first end of the inlet pipe is provided with the first inlet, and the pipe body has several second outlets; one end of the branch pipe is connected to the second outlet; several outlet holes are opened on each branch pipe, and the outlet holes are connected to the liquid cooling cavity for distributing coolant to the liquid cooling cavity.

[0010] Preferably, the liquid inlet pipe extends from top to bottom along the side wall of the second housing to the bottom of the second housing, the branch pipe is laid on the bottom wall of the liquid cooling cavity, and several liquid outlet holes are arranged at intervals along the length of the branch pipe.

[0011] Preferably, the first outlet, the balance port, and the first inlet are all located on the same side of the first housing.

[0012] Preferably, the external liquid storage container is an open container, and the interior of the open container is in communication with the atmosphere.

[0013] Preferably, the top of the first housing is provided with a cover, and the cover is hinged to the first housing.

[0014] The present invention also provides an immersion liquid cooling circulation system, comprising: at least one of the aforementioned immersion liquid cooling cabinets, an external liquid storage container, and a CDU, wherein the balance port of each immersion liquid cooling cabinet is connected to the external liquid storage container to maintain a consistent liquid level in the liquid cooling chamber of each immersion liquid cooling cabinet; the CDU has a circulation pump and a heat exchanger, and the first outlet of each immersion liquid cooling cabinet, the circulation pump, the heat exchanger, and the first inlet of each immersion liquid cooling cabinet are sequentially connected to form a circulation loop; the inlet of the circulation pump is connected to the first outlet of each immersion liquid cooling cabinet for extracting the coolant overflowing from the liquid cooling chamber of each immersion liquid cooling cabinet into the overflow tank; the outlet of the circulation pump is connected to the hot runner inlet of the heat exchanger, and the hot runner outlet of the heat exchanger is connected to the first inlet of each immersion liquid cooling cabinet to allow the coolant from each immersion liquid cooling cabinet to exchange heat with an external cold source.

[0015] In this invention, by connecting each balancing port in parallel to the same external liquid storage container, based on the principle of communicating vessels, the liquid level in the liquid cooling chambers of each cabinet automatically tends to be consistent. This eliminates the need for liquid level sensors and corresponding control systems on each cabinet, reducing system hardware costs and eliminating reliability risks caused by sensor failures or control logic anomalies. The control method is simpler and more reliable. By arranging the first outlet, balancing port, and first inlet at progressively decreasing heights in the vertical direction, the circulation and level adjustment of the coolant can be effectively driven by gravity, improving the system's energy efficiency. By setting the connection points between the outlet pipe and the balancing pipe at the same height within the overflow tank, and by designing that both the first and second connection points are higher than the first outlet, it is ensured that the coolant in the overflow tank flows downwards by gravity to the first outlet after entering the outlet pipe. This ensures a smooth flow path and avoids flow resistance and level fluctuations caused by pipe undulations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the immersion liquid-cooled cabinet proposed in this invention; Figure 2 This is a schematic diagram of the structure of the second housing of the immersion liquid-cooled cabinet proposed in this invention; Figure 3 This is a top view of the liquid cooling cavity and overflow tank inside the second housing of the immersion liquid-cooled cabinet proposed in this invention; Figure 4 This is a schematic diagram of the liquid inlet pipe, liquid outlet pipe, balance pipe, first inlet, first outlet, and balance port of the immersion liquid cooling cabinet proposed in this invention; Figure 5This is a schematic diagram of the inlet pipe, outlet pipe, and balance pipe of the immersion liquid cooling cabinet proposed in this invention; Figure 6 This is a schematic diagram of three immersion liquid cooling cabinets connected in parallel in the immersion liquid cooling circulation system proposed in this invention. Detailed Implementation

[0017] Reference Figure 1 This invention proposes an immersion liquid-cooled cabinet, comprising: a first housing 1 and a second housing 2. The first housing 1 serves as the outer shell of the cabinet and is constructed from welded or assembled metal sheets, forming a rectangular box structure. The top of the first housing 1 is open. A cover 3 is provided on the top of the first housing 1, and the cover 3 is hinged to the first housing 1 for easy opening and closing by operators. When closed, the cover 3 covers the open portion of the top of the first housing 1. The cover 3 serves two purposes: firstly, it prevents external dust and foreign objects from entering the cabinet, and secondly, it provides sealing and protection during cabinet operation.

[0018] The second housing 2 is arranged inside the first housing 1, forming an isolation space between them. The isolation space serves to isolate the second housing 2 from the external environment and also acts as a safety reservoir. When the second housing 2 leaks or the coolant overflows accidentally, the isolation space can contain the leaked or overflowing coolant, preventing the coolant from leaking directly into the external environment.

[0019] like Figure 1 and Figure 2 The second housing 2 has an open inner cavity 21, within which a partition 22 is installed. The partition 22 divides the inner cavity 21 into a liquid cooling chamber 211 and an overflow tank 212. The overflow tank 212 is located on the upper side of the liquid cooling chamber 211, and the top of the partition 22 is lower than the top open edge of the inner cavity 21, allowing the liquid cooling chamber 211 and the overflow tank 212 to communicate with each other above the top of the partition 22. In use, the server is immersed in the liquid cooling chamber 211 below the surface of the coolant, which absorbs the heat generated during server operation. When the coolant level in the liquid cooling chamber 211 rises above the top of the partition 22, the coolant can overflow from the top of the liquid cooling chamber 211, passing over the partition 22 and entering the overflow tank 212.

[0020] Furthermore, to facilitate server wiring submerged below the liquid surface in the second housing 2, a feature is also provided on one side wall of the second housing 2. Figure 2 The cable pass-through hole 6 shown in the diagram allows the connection cables in the server to pass through from the rack.

[0021] In this embodiment, the second housing 2 is welded from stainless steel plates, forming a sealed container structure with good corrosion resistance and structural strength. Two overflow channels 212 are provided, respectively located on two opposite side walls of the second housing 2 and extending along the length of the second housing 2. The two overflow channels 212 are symmetrically arranged and jointly receive the coolant overflowing from the liquid cooling cavity 211. This symmetrical double overflow channel 212 structure facilitates uniform overflow of coolant along the length of the cabinet, avoiding problems such as liquid level deviation and uneven flow caused by unilateral overflow.

[0022] like Figure 1 The cabinet is also equipped with a first flow channel 4, which is connected to the liquid cooling cavity 211 and is used to deliver cooled coolant to the liquid cooling cavity 211. The first flow channel 4 has a first inlet 41, which is located on the side wall of the first housing 1 and is used to connect with external pipelines to receive low-temperature coolant from the outside.

[0023] The first flow channel 4 includes an inlet pipe 42 and several branch pipes 43. The inlet pipe 42 has a first inlet 41 at its first end and several second outlets along its body; the inlet pipe 42 extends from top to bottom along the side wall of the second housing 2. Specifically, as... Figure 4 As shown, the liquid inlet pipe 42 enters from the first inlet 41, extends vertically downwards along the outer surface of the side wall of the second housing 2 to the bottom of the second housing 2, then passes through the side wall of the second housing 2 and enters the interior of the liquid cooling chamber 211, and communicates with each branch pipe 43. Each branch pipe 43 is laid on the bottom wall of the liquid cooling chamber 211, one end of the branch pipe 43 is connected to the second outlet of the second end of the liquid inlet pipe 42, and the other end of the branch pipe 43 is closed.

[0024] Each branch pipe 43 is arranged parallel to the length (front-to-back direction) of the bottom wall of the liquid cooling cavity 211. The number of branch pipes 43 is determined according to the width of the liquid cooling cavity 211 and the heat dissipation requirements; for example, it can be set to three, five, or seven. Each branch pipe 43 has several liquid outlet holes 431, which are arranged at intervals along the length of the branch pipe 43. The opening direction of the liquid outlet holes 431 faces the inside of the liquid cooling cavity 211, and is used to distribute the coolant into the liquid cooling cavity 211. The number and diameter of the liquid outlet holes 431 are determined according to the requirements of liquid supply flow rate and heat dissipation uniformity.

[0025] During operation, the cryogenic coolant entering from the first inlet 41 flows sequentially through the inlet pipe 42 and the branch pipe 43, and finally flows out from each outlet hole 431 to the bottom of the liquid cooling chamber 211. The cryogenic coolant flows upward from the bottom of the liquid cooling chamber 211, flows through the heat-generating components such as servers immersed in the coolant, absorbs heat, increases in temperature and decreases in density, continues to flow upward, and finally overflows from the top of the liquid cooling chamber 211, passing over the partition 22 and entering the overflow tank 212.

[0026] In this embodiment, the liquid inlet pipe 42 extends from top to bottom along the side wall of the second housing 2. Essentially, it utilizes the vertical drop between the liquid inlet and the bottom of the liquid cooling cavity 211 to guide the coolant from a higher position to a lower position. In the downward section of the liquid inlet pipe 42, the component of gravity acting on the coolant along the flow direction continuously performs work on the liquid. This component of gravity is consistent with the direction of the head provided by the circulating pump, which is equivalent to providing auxiliary driving force for the downward flow of the liquid.

[0027] The higher inlet position creates a static head at the inlet of inlet pipe 42. During the start-up phase of the circulating pump, this static head helps the coolant quickly fill the downstream pipe section, shortening the supply response time. During normal operation, the continuous work done by gravity on the liquid effectively reduces the head required at the outlet of the circulating pump. This means the circulating pump only needs to provide the pressure required to overcome friction and local resistance, rather than the full head required to lift the liquid from a lower to a higher position. Therefore, this arrangement significantly reduces the operating head and power consumption of the circulating pump while ensuring supply pressure and flow rate. It also makes the pump's operating point more stable and reduces supply pressure fluctuations.

[0028] like Figure 1 The cabinet is also equipped with a second flow channel 5, which is connected to the overflow tank 212 and is used to discharge the coolant that overflows from the liquid cooling chamber 211 into the overflow tank 212 for cooling.

[0029] The second flow channel 5 has a first outlet 51 and a balancing port 52. The height of the first outlet 51 is higher than the height of the balancing port 52. The height of the first inlet 41 is lower than the height of the first outlet 51 but higher than the height of the balancing port 52. Furthermore, the first outlet 51, the balancing port 52, and the first inlet 41 are all located on the same side of the first housing 1. This design allows operators to complete all external piping connections from only one side of the cabinet during installation, making installation and maintenance more convenient. Simultaneously, this centralized arrangement also facilitates wall-mounted installation and parallel deployment of the cabinets.

[0030] like Figure 3 The first outlet 51, the first inlet 41, and the balance port 52 are all symmetrically arranged on the left and right walls of the first housing 1. That is, both the left and right walls are equipped with an outlet, the first inlet 41, and the balance port 52. This symmetrical configuration of the outlet and balance port 52 on both sides allows operators to flexibly choose to connect the outlet, inlet, and balance pipes from either the left or right side, depending on the spatial layout of the server room and the piping routing. Unused interfaces on one side can be sealed with end caps or valves. This design greatly improves the space adaptability and deployment flexibility of the cabinet during on-site installation.

[0031] In one embodiment of the present invention, the first outlet 51 is located at the upper part of the left or right side wall of the first housing 1, i.e., the highest position of that side; the balance port 52 is located at the lower part of the left or right side wall of the first housing 1, i.e., the lowest position of that side; and the first inlet 41 is located at the middle part of the left or right side wall of the first housing 1. The three ports are arranged from top to bottom on the same side of the first housing 1 as follows: the first outlet 51 is located at the highest position, the first inlet 41 is located in the middle position, and the balance port 52 is located at the lowest position.

[0032] This vertically layered layout, with "top outlet, middle inlet, and bottom balance," allows each of the three ports to correspond to a different functional height: the first outlet 51 is located at the highest position, where the coolant can naturally overflow and be discharged when the liquid level in the liquid cooling cavity 211 rises to this height. This facilitates the priority discharge of the coolant from the upper layer of the liquid cooling cavity 211, allowing it to enter the external cooling unit for cooling. Due to the thermosiphon effect, the high-temperature coolant naturally rises, so only the hottest portion of the coolant is discharged, improving heat exchange efficiency. This design is particularly suitable for single-phase immersion liquid cooling systems—where the coolant decreases in density and naturally rises after absorbing heat. The return port at the highest position perfectly aligns with this physical characteristic, ensuring that the natural upward movement of the hot liquid is completely consistent with the return path, further enhancing the priority discharge of the hot liquid.

[0033] The first inlet 41 is located in the middle position, which facilitates the introduction of coolant from the middle of the side and its downward flow along the side wall to the bottom, where it falls naturally by gravity, resulting in stable supply pressure and smooth flow.

[0034] The balance port 52 is located at the lowest position and is connected to the external liquid storage container. The external liquid storage container is an open container, and its interior is open to the atmosphere. The liquid surface of the open container is always subjected to atmospheric pressure, which allows the coolant to flow freely in both directions between the balance port 52 and the external liquid storage container, ensuring the normal operation of the communicating vessel principle. When the liquid level in the liquid cooling cavity 211 is higher than the preset liquid level, the balance port 52 can discharge the coolant in the overflow tank 212 to the external liquid storage container through the balance port 52; and when the liquid level in the liquid cooling cavity 211 is lower than the preset liquid level, the liquid in the external liquid storage container can flow back to the liquid cooling cavity 211 through the balance port 52, so as to achieve automatic balance of the liquid level in the liquid cooling cavity 211.

[0035] It is worth noting that the preset liquid level is matched with the height of the balance port 52. That is, the preset liquid level is equal to the liquid level corresponding to the height of the balance port 52. Specifically, when the liquid level in the liquid cooling chamber 211 is higher than the balance port 52, the coolant is discharged outwards through the balance port 52. This process can be used not only when the internal liquid level is inconsistent during the initial installation of the cabinet, but also to provide overflow protection when the liquid level inside the cabinet rises abnormally (such as excessive supply or poor return), preventing coolant from overflowing from the top of the second housing 2. When the liquid level in the liquid cooling chamber 211 is lower than the balance port 52, the coolant in the external storage container flows back inwards through the balance port 52 to replenish the insufficient liquid level. Through this configuration, the liquid level in the liquid cooling chamber 211 is automatically maintained near the height of the balance port 52, achieving automatic liquid level balancing without sensors or power drive.

[0036] In multi-machine parallel applications, the balance ports 52 of each cabinet are connected in parallel to the same external liquid storage container. Based on the principle of communicating vessels, the liquid level in the liquid cooling chambers 211 of each cabinet automatically tends to be consistent, eliminating the need to install liquid level sensors and control systems on each cabinet, reducing system cost and complexity, and improving reliability.

[0037] like Figures 2-5 The second flow channel 5 includes an outlet pipe 53 and a balance pipe 54. The first end of the outlet pipe 53 is connected to the overflow tank 212, and the second end of the outlet pipe 53 is connected to the first outlet 51. The connection between the outlet pipe 53 and the overflow tank 212 forms a first connecting part 531. That is, the first end of the outlet pipe 53 is connected to the bottom wall of the overflow tank 212 and can be fixed and sealed by welding or threaded connection. Figure 2 and Figure 5 The liquid outlet pipe 53 is located at the bottom of the overflow tank 212, arranged in a U-shape on the outer wall of the second housing 2, and connected to the first outlet 51.

[0038] The first end of the balancing pipe 54 is connected to the overflow tank 212, and the second end of the balancing pipe 54 is connected to the balancing port 52. The connection between the balancing pipe 54 and the overflow tank 212 forms a second connection part 541. The first end of the balancing pipe 54 is also connected to the bottom wall of the overflow tank 212, and is arranged side by side with the first end of the outlet pipe 53. Figure 2 and Figure 5 The balancing pipe 54 extends downward from the second connecting part 541 and finally forms a balancing port 52 at a height lower than the first outlet 51.

[0039] Both the first end of the outlet pipe 53 and the first end of the balance pipe 54 are connected to the bottom wall of the overflow tank 212, so that the first connecting part 531 and the second connecting part 541 are at the same height, that is, the opening heights of the two on the bottom wall of the overflow tank 212 are the same. Thus, when the coolant in the overflow tank 212 simultaneously enters the outlet pipe 53 and the balance pipe 54, it has the same initial potential energy. The heights of the first connecting part 531 and the second connecting part 541 are both higher than the height of the first outlet 51. Due to the height difference between the first connecting part 531 and the first outlet 51, the coolant in the overflow tank 212, after entering the outlet pipe 53, can flow downwards by gravity to the first outlet 51 for discharge without the need for external power. The entire flow path, from the bottom of the overflow tank 212 → first outlet 51 → first inlet 41 → balance port 52, decreases in height sequentially, forming a complete gravity-driven path, which helps reduce system energy consumption.

[0040] The coolant discharged through the first outlet 51 is cooled down and then enters the liquid cooling chamber through the first inlet 41, forming a circulation.

[0041] In addition, after the cycle has been running for a long time, impurities will inevitably appear inside the second housing 2. To facilitate cleaning, a drain port 7 is provided at the bottom of the second housing 2 for easy drainage. The drain port 7 can be closed during the coolant circulation process.

[0042] The following will combine, for example, Figure 6 The immersion liquid cooling circulation system shown provides a detailed explanation of the operation process of the immersion liquid cooling cabinet.

[0043] The immersion liquid cooling circulation system includes at least one immersion liquid cooling cabinet, an external liquid storage container, and a CDU. The balance port 52 of each immersion liquid cooling cabinet is connected to the external liquid storage container to maintain a consistent liquid level in the liquid cooling chamber 211 of each immersion liquid cooling cabinet. The CDU is equipped with a circulation pump and a heat exchanger. The first outlet 51 of each immersion liquid cooling cabinet, the circulation pump, the heat exchanger, and the first inlet 41 of each immersion liquid cooling cabinet are sequentially connected to form a circulation loop. The inlet of the circulation pump is connected to the first outlet 51 of each immersion liquid cooling cabinet to extract the coolant overflowing from the liquid cooling chamber 211 of each immersion liquid cooling cabinet into the overflow tank 212. The outlet of the circulation pump is connected to the hot runner inlet of the heat exchanger, and the hot runner outlet of the heat exchanger is connected to the first inlet 41 of each immersion liquid cooling cabinet to allow the coolant from each immersion liquid cooling cabinet to exchange heat with an external cold source.

[0044] Before using the above-mentioned immersion liquid-cooled cabinet, connect the cabinet via piping as follows: Figure 6The illustrated immersion liquid cooling circulation system, in a multi-server parallel deployment, has its balancing ports 52 connected in parallel to the same external liquid storage container. Since the coolant level in each rack cannot be guaranteed to remain consistent after different servers are installed, when the coolant level in one rack is higher than in others, the excess coolant is drained into the external liquid storage container through the balancing port 52 and then replenished in the racks with lower coolant levels. The entire adjustment process is fully automated based on the principle of communicating vessels, requiring no sensors, controllers, or electric valves, achieving true sensorless automatic liquid level balancing.

[0045] When using an immersion liquid-cooled cabinet, the circulation path of the coolant in the above system is as follows: The low-temperature coolant, after being cooled by the heat exchanger in the CDU, enters the inlet pipe 42 from the first inlet 41, flows down along the side wall of the second shell 2 to the bottom of the second shell 2, enters each branch pipe 43 laid on the bottom wall of the liquid cooling chamber 211, and finally flows out evenly from the outlet hole 431 on each branch pipe 43 to the bottom of the liquid cooling chamber 211.

[0046] The low-temperature coolant flows upward from the bottom of the liquid cooling cavity 211, passing through heat-generating components such as servers immersed in the coolant. After absorbing heat, the temperature rises and the density decreases, and the high-temperature coolant naturally floats to the upper layer of the liquid cooling cavity 211.

[0047] When the liquid level in the liquid cooling chamber 211 rises to a height higher than the top of the partition 22, the high-temperature coolant in the upper layer overflows over the partition 22 and enters the overflow tank 212. The coolant in the overflow tank 212 is discharged through the outlet pipe 53. The coolant in the outlet pipe 53 flows out from the first outlet 51 and enters the circulation pump. The circulation pump then sends it to the heat exchanger for cooling. The cooled coolant flows out of the heat exchanger again and enters the cabinet through the first inlet 41, forming a circulation loop.

[0048] During this process, the balance port 52 remains connected to the external liquid storage container, automatically adjusting the liquid level in the liquid cooling chamber 211: when the liquid level in the liquid cooling chamber 211 rises (e.g., due to an increase in the liquid supply or a change in the circulation pump flow), excess coolant is discharged into the external liquid storage container through the balance pipe 54 and the balance port 52; when the liquid level in the liquid cooling chamber 211 drops (e.g., due to evaporation loss or system leakage), the coolant in the external liquid storage container flows back to the overflow tank 212 through the balance port 52 and the balance pipe 54, and is replenished to the liquid cooling chamber 211 through the aforementioned circulation loop.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An immersion liquid-cooled cabinet, characterized in that, include: First shell, second shell, first flow channel and second flow channel; The second housing is arranged inside the first housing, forming an isolation space between them. This isolation space isolates the second housing from the external environment. The second housing has an open inner cavity with a partition dividing it into a liquid cooling cavity and an overflow tank. The top of the partition is lower than the top edge of the open inner cavity, allowing the liquid cooling cavity and the overflow tank to communicate above the partition. A first flow channel communicates with the liquid cooling cavity and supplies coolant to it. A second flow channel communicates with the overflow tank and discharges coolant overflowing from the liquid cooling cavity into the overflow tank. The first flow channel has a first inlet, and the second flow channel has a first outlet and a balance port. The heights of the first outlet, the first inlet, and the balance port decrease sequentially. The balance port communicates with an external liquid storage container and is used to discharge coolant from the overflow tank to the external liquid storage container when the liquid level in the liquid cooling cavity is higher than a preset level. Conversely, when the liquid level in the liquid cooling cavity is lower than the preset level, liquid from the external liquid storage container flows back into the liquid cooling cavity through the balance port, thus achieving automatic balancing of the liquid level in the liquid cooling cavity.

2. The immersion liquid-cooled cabinet according to claim 1, characterized in that, The preset liquid level is matched with the height of the balance port so that when the liquid level in the liquid cooling chamber is higher than the balance port, the coolant is discharged out through the balance port; when the liquid level in the liquid cooling chamber is lower than the balance port, the liquid in the external liquid storage container flows back into the liquid cooling chamber through the balance port.

3. The immersion liquid-cooled cabinet according to claim 1, characterized in that, The second flow channel includes an outlet pipe and a balance pipe. The first end of the outlet pipe is connected to the overflow tank, and the second end of the outlet pipe is connected to the first outlet. The connection between the outlet pipe and the overflow tank forms a first connection part. The first end of the balance pipe is connected to the overflow tank, and the second end of the balance pipe is connected to the balance port. The connection between the balance pipe and the overflow tank forms a second connection part. The first connection part and the second connection part are located at the same height.

4. The immersion liquid-cooled cabinet according to claim 3, characterized in that, The heights of both the first connecting part and the second connecting part are higher than the height of the first exit.

5. The immersion liquid-cooled cabinet according to claim 1, characterized in that, The first flow channel includes an inlet pipe and several branch pipes; the first end of the inlet pipe is provided with the first inlet, and the pipe body has several second outlets; one end of the branch pipe is connected to the second outlet; several outlet holes are opened on each branch pipe, and the outlet holes are connected to the liquid cooling cavity to distribute the coolant into the liquid cooling cavity.

6. The immersion liquid-cooled cabinet according to claim 5, characterized in that, The liquid inlet pipe extends from top to bottom along the side wall of the second housing to the bottom of the second housing. The branch pipe is laid on the bottom wall of the liquid cooling chamber, and several liquid outlet holes are arranged at intervals along the length of the branch pipe.

7. The immersion liquid-cooled cabinet according to claim 1, characterized in that, The first outlet, the balance port, and the first inlet are all located on the same side of the first housing.

8. The immersion liquid-cooled cabinet according to claim 1, characterized in that, The external liquid storage container is an open container, and the interior of the open container is open to the atmosphere.

9. The immersion liquid-cooled cabinet according to claim 1, characterized in that, The top of the first housing is provided with a cover, which is hinged to the first housing.

10. An immersion liquid cooling circulation system, characterized in that, include: At least one of the immersion liquid-cooled cabinets, external liquid storage containers, and CDUs as described in any one of claims 1-9, wherein the balance port of each immersion liquid-cooled cabinet is connected to the external liquid storage container to maintain a consistent liquid level in the liquid-cooled chambers of each immersion liquid-cooled cabinet; the CDU has a circulation pump and a heat exchanger, and the first outlet of each immersion liquid-cooled cabinet, the circulation pump, the heat exchanger, and the first inlet of each immersion liquid-cooled cabinet are sequentially connected to form a circulation loop; the inlet of the circulation pump is connected to the first outlet of each immersion liquid-cooled cabinet for extracting the coolant overflowing from the liquid-cooled chambers of each immersion liquid-cooled cabinet into the overflow tank; the outlet of the circulation pump is connected to the hot runner inlet of the heat exchanger, and the hot runner outlet of the heat exchanger is connected to the first inlet of each immersion liquid-cooled cabinet to allow the coolant from each immersion liquid-cooled cabinet to exchange heat with an external cold source.

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