Two-phase liquid cooling system

Abstract

The present application discloses a two-phase liquid cooling system, which includes at least one liquid cooling node, a first cavity and a condenser. The liquid cooling node is used to accommodate a heat source device and an insulating medium. The condenser is used to liquefy a gaseous insulating medium into a liquid insulating medium. The first inlet of the first cavity is connected to the flow channel outlet of each liquid cooling node, the gas outlet of the first cavity is connected to the first inlet of the condenser, and the first outlet of the condenser and the liquid outlet of the first cavity are respectively connected to the flow channel inlet of each liquid cooling node. By setting a first cavity between the liquid cooling node and the condenser for gas-liquid separation, not only can the economic cost and energy cost required for deploying and operating the gas-liquid separator be saved, but also the situation that the liquid insulating medium directly flows back to the liquid cooling node and causes the flow channel outlet to be blocked can be avoided, so as to solve the layout restriction problem of the flow channel outlet on the liquid cooling node, and the layout of the liquid cooling node is freer.

Description

Technical Field

[0001] The present application relates to the field of heat dissipation technology, and in particular to a two-phase liquid cooling system. Background Art

[0002] As data centers develop towards high power density, traditional air cooling can no longer meet the heat dissipation needs of data centers. Currently, there are designs that use liquid cooling to dissipate heat in data centers. In liquid cooling systems, immersion liquid cooling solutions can remove 100% of the heat from servers because non-conductive refrigerants can directly contact the servers, thus having a huge advantage in energy efficiency.

[0003] There are two main forms of existing immersion liquid cooling. One is to place the server in a large tank filled with insulating working fluid. The insulating working fluid in the large tank flows without phase change and only produces convective heat transfer and heat conduction with the server. However, this form has a large demand for insulating working fluid and is relatively costly.

[0004] Another method is to place the server in a liquid cooling node filled with insulating working fluid. The insulating working fluid absorbs the heat generated by the server, and the insulating working fluid changes phase into gas form and is sent to the condenser through the outlet of the liquid cooling node. After the heat is released, the insulating working fluid returns to liquid form and can be sent back to the liquid cooling node.

[0005] However, the above two-phase liquid cooling system requires that the air outlet of the liquid cooling node be higher than the condenser to prevent the condensed liquid from flowing back and blocking the air outlet of the liquid cooling node, affecting the circulation of the insulating medium, thereby preventing excessive pressure in the liquid cooling node, exceeding the maximum bearing capacity of the liquid cooling node, and causing safety risks. When the liquid cooling node is set in a horizontal slot, the overall height is lower than the vertical slot, and the air outlet height is lower; the height requirement of the two-phase liquid cooling system for the air outlet of the liquid cooling node makes it difficult to set the liquid cooling node in a horizontal slot, limiting the layout of the liquid cooling node. Summary of the invention

[0006] An embodiment of the present application provides a two-phase liquid cooling system for solving the layout limitation problem of liquid cooling nodes in the existing two-phase liquid cooling system.

[0007] In a first aspect, the present application provides a two-phase liquid cooling system, the system comprising:

[0008] At least one liquid cooling node, the liquid cooling node is used to accommodate a heat source device and an insulating medium, the insulating medium can absorb the heat of the heat source device and transform from a liquid state to a gaseous state; the liquid cooling node includes a flow channel inlet and a flow channel outlet; a first cavity, the first cavity includes a first inlet, a gas outlet and a liquid outlet; and a condenser, the condenser is used to liquefy the gaseous insulating medium into the liquid insulating medium; the condenser includes a first inlet and a first outlet;

[0009] The first inlet of the first cavity is connected to the flow channel outlet of each of the liquid-cooled nodes, the air outlet of the first cavity is connected to the first inlet of the condenser, and the first outlet of the condenser and the liquid outlet of the first cavity are respectively connected to the flow channel inlet of each of the liquid-cooled nodes;

[0010] After the insulating working medium contained in the liquid-cooled node absorbs the heat of the thermal source device, it can enter the first cavity through the flow channel outlet of the liquid-cooled node and the first inlet of the first cavity; the gaseous insulating working medium in the first cavity can enter the condenser through the gas outlet of the first cavity and the first inlet of the condenser, and after being liquefied by the condenser, enter the liquid-cooled node through the first outlet of the condenser and the flow channel inlet of the liquid-cooled node; the liquid insulating working medium in the first cavity can enter the liquid-cooled node through the liquid outlet of the first cavity and the flow channel inlet of the liquid-cooled node.

[0011] In an embodiment of the present application, by setting a first cavity between the liquid cooling node and the condenser for gas-liquid separation, not only the economic cost and energy cost required for deploying and operating the gas-liquid separator can be saved, but also the situation where the liquid insulating working fluid directly flows back to the liquid cooling node and causes the flow channel outlet to be blocked can be avoided, thereby solving the layout restriction problem of the flow channel outlet on the liquid cooling node, and the layout of the liquid cooling node is freer.

[0012] In a possible implementation, the first cavity further includes a second inlet, the second inlet of the first cavity is lower than the first inlet of the first cavity, and the second inlet of the first cavity is connected to the flow channel outlet of each liquid cooling node.

[0013] In the present application, the gaseous insulating working fluid discharged from the liquid cooling node can enter the first cavity through the first inlet under the action of buoyancy, and the discharged liquid insulating working fluid can flow into the first cavity through the second inlet under the action of gravity. By setting the second inlet lower than the first inlet, gas-liquid separation of the insulating working fluid discharged from the liquid cooling node can be achieved.

[0014] In a possible implementation, the flow channel outlet of each liquid cooling node is higher than the second inlet of the first cavity.

[0015] In the present application, by setting the flow channel outlet of each liquid cooling node to be higher than the second inlet of the first cavity, when the liquid level of the first cavity is higher than the second inlet and lower than the flow channel outlet, the liquid cooling node can still discharge liquid insulating medium into the first cavity, thereby further avoiding the situation where the flow channel outlet is blocked.

[0016] In a possible implementation, the system also includes a control unit, a first pump body and a liquid level sensor arranged in the first cavity, the first end of the first pump body is connected to the liquid outlet of the first cavity, and the second end of the first pump body is respectively connected to the flow channel inlet of each liquid cooling node; the control unit is used to control the switch of the first pump body according to the liquid level data in the first cavity collected by the liquid level sensor, and the first pump body is used to pump the liquid insulating working medium in the first cavity to each liquid cooling node.

[0017] In the embodiment of the present application, when the liquid level data reflects that the current second inlet or flow channel outlet is liquid-sealed, the control unit turns on the first pump body to quickly pump the liquid insulating working fluid in the first cavity back to the liquid cooling node to quickly lower the liquid level. This can avoid the liquid sealing phenomenon causing excessive pressure inside the liquid cooling node and improve the reliability of the liquid cooling system.

[0018] In a possible implementation, the system also includes a control unit and a first pressure sensor, which is arranged in the first cavity; the condenser includes a first proportional valve, a first heat exchange unit and a first cold source, the first cold source is connected to the first heat exchange unit, the first coolant input by the first cold source and the insulating working medium input by the first cavity are heat exchanged in the first heat exchange unit, and the first proportional valve is used to control the flow rate of the first coolant in the first heat exchange unit; the first pressure sensor is used to collect first pressure data in the first cavity; the control unit is specifically used to control the opening of the first proportional valve according to the first pressure data.

[0019] In an embodiment of the present application, when the first pressure data reflects that the current air pressure in the first cavity is abnormal, the control unit adjusts the opening of the first proportional valve to adjust the liquefaction rate of the insulating medium in the condenser, the second cavity and the first cavity, so that the insulating medium expands or contracts, thereby achieving the purpose of restoring the air pressure.

[0020] In a possible implementation, the system also includes a subcooler, a first inlet of the subcooler is connected to a first outlet of the condenser, and the first outlet of the subcooler is connected to a flow channel inlet of the liquid cooling node; the subcooler is used to reduce the temperature of the insulating working fluid input into the liquid cooling node.

[0021] In the embodiment of the present application, a condenser and a subcooler are provided in the liquid cooling system to respectively assume the responsibilities of condensation and cooling. The vaporized insulating working fluid in the mixed gas can be first recovered by the condenser, and the air in the mixed gas can be separated at the same time. The insulating working fluid with higher purity can then be cooled by the subcooler. This can maximize the heat absorption capacity of the insulating working fluid while reducing the mixed moisture or other conductive components in the air, thereby maintaining the purity of the insulating working fluid and improving the safety and heat dissipation efficiency of the liquid cooling system.

[0022] In one possible implementation, the system also includes a second pump body, a first end of the second pump body is connected to the first outlet of the subcooler, and a second end of the second pump body is connected to the flow channel inlet of the liquid cooling node; the second pump body is used to pump the insulating working fluid in the subcooler to the liquid cooling node.

[0023] In the embodiment of the present application, by providing a second pump body, liquid insulating working fluid can be quickly replenished for the liquid cooling node.

[0024] In a possible implementation, the system also includes a control unit, a temperature sensor and a third pressure sensor, the temperature sensor is arranged at the second end of the second pump body, and the third pressure sensor is arranged at the first end of the second pump body; the subcooler includes a second proportional valve, a second heat exchange unit and a second cold source, the second cold source is connected to the second heat exchange unit, the second coolant input by the second cold source and the insulating working medium received by the subcooler are heat exchanged in the second heat exchange unit, and the second proportional valve is used to control the flow rate of the second coolant in the second heat exchange unit; the control unit is used to control the opening of the second proportional valve according to the temperature data collected by the temperature sensor and the third pressure data collected by the third pressure sensor.

[0025] In the embodiment of the present application, by setting a second proportional valve to adjust the cold input of the second cold source, the temperature of the insulating working fluid input to the liquid cooling node can be adjusted in time, thereby maximizing the utilization efficiency of the second cold source while ensuring the heat dissipation effect of the liquid cooling system.

[0026] In one possible implementation, the system also includes a liquid reservoir, a first end of which is connected to the first outlet of the supercooler, and a second end of which is connected to the first end of the second pump body; the liquid reservoir is used to store the liquid insulating working fluid, and the second pump body is used to pump the insulating working fluid in the liquid reservoir to the liquid cooling node.

[0027] In the embodiment of the present application, a liquid reservoir is provided to collect the liquid insulating working fluid after being cooled by the supercooler and then transport it to the liquid cooling node through the pump body. On the one hand, the total amount of insulating working fluid in the liquid cooling system can be increased, and on the other hand, the input fluid temperature of the second pump body can be more balanced and the inlet pressure can be more stable.

[0028] In one possible implementation, the system includes a control unit, a second pressure sensor and a bypass valve, wherein the first end of the bypass valve is connected to the second end of the second pump body, and the second end of the bypass valve is connected to the first end of the liquid reservoir; the second pressure sensor is arranged at the second end of the second pump body, and the second pressure sensor is used to collect second pressure data of the output fluid of the second pump body; the control unit is used to control the opening of the bypass valve according to the second pressure data.

[0029] In the embodiment of the present application, by providing a bypass valve, it is possible to avoid the liquid replenishment speed being too fast, which would cause the liquid insulating medium in the liquid cooling node 10 to overflow and affect the heat dissipation effect.

[0030] In a possible implementation, the system further includes a second cavity, the flow channel inlet of the second cavity is connected to the first outlet of the condenser, the liquid outlet of the second cavity is connected to the flow channel inlet of the liquid cooling node, and the air outlet of the second cavity is connected to the outside air.

[0031] In the embodiment of the present application, by setting up a second cavity to perform another gas-liquid separation on the condenser output fluid, the air content of the liquid insulating working fluid in the liquid cooling system can be reduced; by setting the exhaust port of the liquid cooling system in the second cavity, compared with the scheme of directly setting the exhaust port in the cavity where the mixed gas of air and gaseous insulating working fluid is located, the content of insulating working fluid in the exhaust gas of the liquid cooling system can be reduced, thereby reducing the pollution of the environment by the insulating working fluid and protecting the environment.

[0032] In a possible implementation, the system also includes a control unit, a solenoid valve, a vacuum pump and a first pressure sensor; the air outlet of the second cavity is connected to the outside air through the solenoid valve and the vacuum pump, and the first pressure sensor is arranged in the first cavity; the control unit is used to control the opening of the solenoid valve and the switch of the vacuum pump according to the first pressure data in the first cavity collected by the first pressure sensor; the vacuum pump is used to restore the air pressure in the first cavity to a preset air pressure value.

[0033] In the embodiment of the present application, when the first pressure sensor detects that the air pressure in the first cavity is abnormal, the solenoid valve and the vacuum pump are opened to adjust the air pressure in the liquid cooling system, thereby improving the reliability of the operation of the liquid cooling system.

[0034] In a second aspect, the present application provides a control method for controlling the two-phase liquid cooling system as described in the first aspect, the system comprising a control unit and a sensor, and also comprising a valve and / or a pump body; the control unit is connected to the sensor, and is also connected to the valve and / or the pump body; the method comprises:

[0035] The control unit acquires the data collected by the sensor; the control unit controls the opening of the valve and / or the switch of the pump body according to the data.

[0036] In a possible implementation, the system also includes a second cavity, the sensor includes a first pressure sensor, the valve includes a solenoid valve, and the pump body includes a vacuum pump; the flow channel inlet of the second cavity is connected to the first outlet of the condenser, and the air outlet of the second cavity is connected to the outside air through the solenoid valve and the vacuum pump. The first pressure sensor is arranged in the first cavity, and the control unit obtains data collected by the sensor, including: the control unit obtains the first pressure data collected by the first pressure sensor; the control unit controls the opening of the valve and / or the switch of the pump body according to the data, including: when the first pressure data is greater than a third pressure threshold, or is continuously greater than the first pressure threshold within a first preset time period, the control unit opens the solenoid valve and the vacuum pump, adjusts the opening of the solenoid valve and controls the vacuum pump to extract the air in the second cavity; when the first pressure data is less than a fourth pressure threshold, or is continuously less than the second pressure threshold within a first preset time period, the control unit opens the solenoid valve; wherein the third pressure threshold is higher than the first pressure threshold, and the fourth pressure threshold is lower than the second pressure threshold.

[0037] In a possible implementation, the sensor includes a first pressure sensor, which is arranged in the first cavity; the valve also includes a first proportional valve in the condenser, the condenser also includes a first cold source and a first heat exchange unit, the first cold source is connected to the first heat exchange unit, the first coolant input by the first cold source and the insulating working medium input by the first cavity exchange heat in the first heat exchange unit, and the first proportional valve is used to control the flow rate of the first coolant in the first heat exchange unit; the control unit obtains data collected by the sensor, including: the control unit obtains the first pressure data collected by the first pressure sensor; the control unit controls the opening of the valve and / or the switch of the pump body according to the data, including: when the first pressure data is greater than the first pressure threshold, the control unit increases the opening of the first proportional valve; when the first pressure data is less than the second pressure threshold, the control unit decreases the opening of the first proportional valve.

[0038] In a possible implementation, the pump body includes a first pump body, the sensor includes a liquid level sensor arranged in the first cavity, the first end of the first pump body is connected to the liquid outlet of the first cavity, and the second end of the first pump body is respectively connected to the flow channel inlet of each liquid cooling node; the control unit obtains the data collected by the sensor, including: the control unit obtains the liquid level data collected by the liquid level sensor; the control unit controls the opening of the valve and / or the switch of the pump body according to the data, including: the control unit opens or closes the first pump body according to the liquid level data.

[0039] In a possible implementation, the system also includes a liquid reservoir, the sensor includes a second pressure sensor, the valve includes a bypass valve, and the pump body also includes a second pump body; the first end of the liquid reservoir is connected to the first outlet of the condenser, the second end of the liquid reservoir is connected to the first end of the second pump body, the second end of the second pump body is connected to the flow channel inlet of the liquid cooling node, the first end of the bypass valve is connected to the second end of the second pump body, the second end of the bypass valve is connected to the first end of the liquid reservoir, and the second pressure sensor is arranged at the second end of the second pump body; the control unit obtains data collected by the sensor, including: the control unit obtains second pressure data collected by the second pressure sensor; the control unit controls the opening of the valve and / or the switch of the pump body according to the data, including: when the second pressure data is greater than the fifth pressure threshold, the control unit increases the opening of the bypass valve; when the second pressure data is less than the sixth pressure threshold, the control unit decreases the opening of the bypass valve.

[0040] In a possible implementation, the system also includes a subcooler, the pump body includes a second pump body, the sensor includes a temperature sensor and a third pressure sensor, the temperature sensor is arranged at the second end of the second pump body, and the third pressure sensor is arranged at the first end of the second pump body; the subcooler includes a second proportional valve, a second heat exchange unit and a second cold source, the first inlet of the subcooler is connected to the first outlet of the condenser, the first outlet of the subcooler is connected to the first end of the second pump body, the second end of the second pump body is connected to the flow channel inlet of the liquid cooling node, the second heat exchange unit is connected to the second cold source, and the second coolant input by the second cold source and the insulating working medium received by the subcooler are connected in Heat is exchanged in the second heat exchange unit, and the second proportional valve is used to control the flow rate of the second coolant in the second heat exchange unit; the control unit obtains data collected by the sensor, including: the control unit obtains temperature data collected by the temperature sensor, and third pressure data collected by the third pressure sensor; the control unit controls the opening of the valve and / or the switch of the pump body according to the data, including: when the temperature data is higher than the sum of the saturation temperature corresponding to the third pressure data and the preset temperature threshold, the control unit increases the opening of the second proportional valve; when the temperature data is lower than the dew point temperature of the computer room where the system is located, the control unit decreases the opening of the second proportional valve.

[0041] It should be understood that the implementation and beneficial effects of the above-mentioned aspects can be referenced to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of a first two-phase liquid cooling system provided in an embodiment of the present application;

[0043] Figure 2 is a structural schematic diagram of a second two-phase liquid cooling system provided in an embodiment of the present application;

[0044] Figure 3 is a structural schematic diagram of a third two-phase liquid cooling system provided in an embodiment of the present application;

[0045] Figure 4 is a structural schematic diagram of a fourth two-phase liquid cooling system provided in an embodiment of the present application;

[0046] Figure 5 is a structural schematic diagram of a fifth two-phase liquid cooling system provided in an embodiment of the present application;

[0047] Figure 6 is a structural schematic diagram of a sixth two-phase liquid cooling system provided in an embodiment of the present application;

[0048] Figure 7 It is a flow chart of a control method for a two-phase liquid cooling system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following describes the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the described embodiments are only embodiments of a part of the present application, rather than all embodiments. It is known to those skilled in the art that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0050] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] See also Figure 1 , Figure 1 The schematic diagram of the structure of the first two-phase liquid cooling system provided in the embodiment of the present application is as follows: Figure 1 As shown, the two-phase liquid cooling system (hereinafter referred to as the liquid cooling system) includes liquid cooling nodes 10 a to 10 b (hereinafter collectively referred to as liquid cooling nodes 10 ), a first cavity 20 and a condenser 30 .

[0052] The liquid cooling node 10 is used to accommodate a heat source device and an insulating medium, and the heat source device is partially or completely immersed in the insulating medium. Specifically, the heat source device can be a device of a communication device, a computing device, or other device that needs to be continuously cooled down in a working state, such as a server single board, a multi-node server, a central processing unit (CPU) or other processing chip on a single board, a hard disk of a device, etc. The heat source device continuously generates heat after entering the working state; the insulating medium has a gas-liquid two-phase phase change characteristic.

[0053] Each liquid cooling node 10 is provided with a flow channel outlet 11 and a flow channel inlet 12 . The flow channel outlet 11 is used to discharge the insulating medium in the liquid cooling node 10 ; the flow channel inlet 12 is used to replenish the liquid insulating medium after heat release and temperature reduction to the liquid cooling node 10 .

[0054] Specifically, the flow channel outlet 11 can be used to discharge at least one of the insulating working fluids in gaseous, liquid and gas-liquid mixed states. During the circulation of the insulating working fluid, the liquid insulating working fluid in the liquid cooling node 10 absorbs the heat generated by the heat source device and then transforms into gaseous state and is discharged from the flow channel outlet 11. It can be understood that the discharged gaseous insulating working fluid contains more or less small droplets of liquid insulating working fluid, that is, the discharged insulating working fluid in this case is in a gas-liquid mixed state; in addition, when the speed of the liquid insulating working fluid replenished at the flow channel inlet 12 is faster than the speed of the liquid cooling node 10 discharging the gas-liquid mixed state insulating working fluid, the liquid level of the insulating working fluid will continue to rise until it is higher than the flow channel outlet 11, and at this time, the liquid insulating working fluid with a liquid level higher than the flow channel outlet 11 is discharged from the flow channel outlet 11.

[0055] The flow channel outlet 11 of each liquid cooling node 10 is connected to the first inlet 21 of the first cavity 20. Figure 1 In the specific example, the flow channel outlet 11a is connected to the first inlet 21a, and the second flow channel outlet 11b is connected to the first inlet 21b.

[0056] It is understandable that there may be multiple first inlets 21 , which is equivalent to increasing the overall diameter of the first inlet 21 , thereby accelerating the speed at which the insulating medium enters the first cavity 20 .

[0057] It is understood that the connection relationship for fluid transportation in the embodiments of the present application refers to connection through pipelines, and the straight lines connecting the components in each diagram represent pipelines, through which the fluid in each component can be transported. Specifically, it can be a hard pipeline or a soft pipeline, which is not limited here.

[0058] It is understandable that due to the physical property that the density of the gaseous insulating medium is lower than that of the liquid insulating medium, the inlet and outlet for transporting gas in the same component of the liquid cooling system can be higher than the inlet and outlet for transporting liquid. This physical property is used to make the fluid flow naturally and the gas and liquid separate in the liquid cooling system without consuming additional energy for work. In the embodiments of the present application, the air inlet and outlet in the same component are higher than the liquid inlet and outlet, and the liquid inlet is higher than the liquid outlet. For example, in the first cavity 20 of the present embodiment, the first inlet 21 for air intake can be higher than the second inlet 22 for liquid intake, and the air outlet 23 for exhausting gas can be higher than the liquid outlet 24 for exhausting liquid; further, the air outlet 23 can be higher than the first inlet 21, and the liquid outlet 24 can be lower than the second inlet 22. The same is true for the second cavity 40 in the following embodiments.

[0059] Optionally, the density of the insulating working fluid in a gaseous state is less than the density of air.

[0060] In this case, the air in the liquid cooling system will not affect the flow of the insulating medium and the gas-liquid separation. For example, when there is air in the first cavity 20, if the density of the insulating medium in the gas state is greater than that of air, the insulating medium will sink after entering the first cavity 20, and will be between the air and the liquid insulating medium, making it difficult to flow to the air outlet 23 disposed near the top of the first cavity, thereby affecting the effect of gas-liquid separation, and thus limiting the height setting of the air outlet 23; conversely, if the density of the insulating medium in the gas state is less than that of air, the air in the first cavity 20 will not affect the flow of the insulating medium and the gas-liquid separation.

[0061] In some other embodiments, the density of the insulating medium in gas state may be greater than or equal to the density of air. In this case, the air content in the liquid cooling system may be reduced as much as possible to reduce the influence of air on the flow of the insulating medium and the gas-liquid separation.

[0062] For ease of understanding, the embodiments of the present application will be described by taking the example that the density of the insulating medium in the gas state is less than the density of air.

[0063] It can be understood that the single component or the plural components marked with a or b in the embodiments of the present application are examples rather than limitations, and the specific number can be determined according to actual needs.

[0064] Among them, the first cavity 20 is used to collect the insulating working fluid discharged from multiple liquid-cooled nodes 10, and naturally separate the gaseous insulating working fluid and the liquid insulating working fluid by utilizing the different physical properties of the insulating working fluid in the gaseous and liquid states; at the same time, the first cavity 20 is also used to block the liquid-cooled node 10 and the condenser 30 to prevent the condensed insulating working fluid from directly flowing back and liquid-sealing the liquid-cooled node 10, causing excessive pressure inside the liquid-cooled node 10.

[0065] Among them, the density of the gaseous insulating medium is less than the density of the liquid insulating medium; after the insulating medium enters the first cavity 20, the liquid insulating medium therein sinks to the bottom of the first cavity 20 under the action of gravity; the gaseous insulating medium rises to the top of the first cavity 20 under the action of buoyancy.

[0066] In this embodiment, after the insulating working medium completes the preliminary gas-liquid separation in the first cavity 20, the gaseous insulating working medium enters the condenser 30 through the gas outlet 23 set at the top of the first cavity 20 for further heat dissipation and cooling; the liquid insulating working medium flows back to the liquid cooling node 10 through the liquid outlet 24 set at the bottom of the first cavity 20.

[0067] Optionally, the first cavity 20 is further provided with a second inlet 22 lower than the first inlet 21, and the second inlet 22 is connected to the flow channel outlet 11 of each liquid cooling node 10. Figure 1 In the specific example, the flow channel outlets 11 a and 11 b are both connected to the second inlet 22 .

[0068] The gaseous insulating medium discharged from the liquid-cooled node 10 can flow into the first cavity 20 through the first inlet 21 under the action of buoyancy, and the discharged liquid insulating medium can flow into the first cavity 20 through the second inlet 22 under the action of gravity. By setting the second inlet 22 lower than the first inlet 21, the insulating medium discharged from the liquid-cooled node 10 can be separated into gas and liquid.

[0069] Optionally, the flow channel outlet 11 of each liquid cooling node 10 is higher than the second inlet 22 .

[0070] In this case, the liquid insulating medium discharged from the liquid cooling node 10 can flow into the first cavity 20 through the second inlet 22 under the action of gravity; at the same time, when the liquid level in the first cavity 20 is higher than the second inlet 22 and lower than the flow channel outlet 11, the liquid cooling node 10 can still discharge the liquid insulating medium into the first cavity 20, further avoiding the situation where the flow channel outlet 11 is blocked.

[0071] Specifically, the first cavity 20 may be a static pressure cavity, which is used to convert the gas flow inside the first cavity 20 into a static pressure flow, so that the airflow at the air outlet is more uniform, with less resistance, and is more convenient for conveying gaseous insulating medium.

[0072] The air outlet 23 of the first cavity 20 is connected to the first inlet 31 of the condenser 30, the liquid outlet 24 of the first cavity 20 is connected to the flow channel inlet 12 of the liquid cooling node 10; the first outlet 32 ​​of the condenser 30 is connected to the flow channel inlet 12 of the liquid cooling node 10. Figure 1 In the specific example, the flow channel inlet 12a of the liquid cooling node 10a and the flow channel inlet 12b of the liquid cooling node 10b are connected to the liquid outlet 24 and the first outlet 32 ​​of the condenser 30 respectively.

[0073] The condenser 30 is used to condense the gaseous insulating medium transported by the first cavity 20. The condenser 30 may be a partition-type heat exchanger, specifically a plate heat exchanger, a jacketed heat exchanger or an immersed coil-type heat exchanger.

[0074] The condenser 30 may include a first heat exchange unit 35 and a first cold source 36. The first cold source 36 is used to input a first cooling liquid into the first heat exchange unit 35. The first cooling liquid exchanges heat with the insulating medium input into the condenser 30 from the first cavity 20 in the first heat exchange unit 35. The heat of the gaseous insulating medium is absorbed by the first cooling liquid and then converted into a liquid insulating medium.

[0075] Specifically, the first inlet 31 and the first outlet 32 ​​of the condenser 30 are also the first inlet 31 and the first outlet 32 ​​of the first heat exchange unit 35 ; the second inlet 34 and the second outlet 33 of the first heat exchange unit 35 are used to connect to the first cold source 36 .

[0076] The cold source may be a natural cold source, such as a cooling tower installed outdoors in winter; or an artificial cold source, such as a mechanical refrigeration device.

[0077] Optionally, the height of the air outlet 23 is higher than the height of the first inlet 31 of the condenser.

[0078] By setting the air outlet 23 to be higher than the first inlet 31 of the condenser, it is possible to prevent the liquid insulating working medium that is cooled and liquefied at the first inlet 31 of the condenser, or the liquid insulating working medium entrained in the gaseous insulating working medium from flowing back, thereby reducing the resistance of the gaseous insulating working medium in the first cavity 20 to enter the condenser 30.

[0079] Optionally, the flow channel outlet 11 of the liquid cooling node 10 is connected to the first inlet 21 and the second inlet 22 of the first cavity 20 through multiple pipelines, and the number of the first inlets 21 of the first cavity 20 corresponds to the number of the liquid cooling nodes 10 .

[0080] In this embodiment, by setting up a multi-branch pipeline to connect the liquid cooling node 10 and the first cavity 20, it is equivalent to that all liquid cooling nodes 10 share all the first inlets 21 and the second inlets 22 connected by the multi-branch pipeline, so that the pressure of the gaseous insulating working fluid on the pipeline can be shared when the heat source devices in some liquid cooling nodes 10 of the liquid cooling system are fully loaded. At the same time, there is no need to set up two pipelines for each flow channel outlet 11 to respectively connect the first inlet 21 and the second inlet 22, which can simplify the pipelines of the liquid cooling system and save costs.

[0081] In a possible implementation, the liquid cooling node 10 is disposed inside the cabinet, and multiple management suspensions connected to the liquid cooling node 10 are disposed outside the cabinet. This implementation can save space inside the cabinet.

[0082] The working principle of the liquid cooling system is:

[0083] After the heat source device in the liquid cooling node 10 enters the working state, it generates heat. The insulating working fluid that absorbs the heat of the heat source device and becomes gaseous rises, enters the first cavity 20 through the flow channel outlet 11 and the first inlet 21, and then enters the condenser 30 through the air outlet 23; after the gaseous insulating working fluid enters the condenser 30 and releases heat to become liquid insulating working fluid, it is returned to the liquid cooling node 10 through the first outlet 32 ​​and the flow channel inlet 12.

[0084] During the operation of the above-mentioned liquid cooling system, the insulating working fluid in the liquid cooling node 10 absorbs heat but expands before vaporizing, causing its volume to increase. When the insulating working fluid liquid level of the liquid cooling node 10 fluctuates higher than the flow channel outlet 11 due to the volume change, the liquid insulating working fluid above the flow channel outlet 11 enters the first cavity 20 through the second inlet 22 under the action of gravity; the gaseous insulating working fluid may be cooled and converted into liquid insulating working fluid before entering the condenser 30; and some liquid insulating working fluid may be entrained in the gaseous insulating working fluid entering the first cavity 20.

[0085] In the above three situations, both gaseous insulating medium and liquid insulating medium will exist in the first cavity 20. The first cavity 20 can separate the insulating medium in the first cavity 20 into gas and liquid through the gas outlet 23 and the liquid outlet 24; specifically, the gaseous insulating medium can enter the condenser 30 through the gas outlet 23, and the liquid insulating medium can flow back to the liquid cooling node 10 through the liquid outlet 24.

[0086] By separating the gas and liquid, the proportion of the gaseous insulating working medium in the fluid entering the condenser 30 can be increased, thereby releasing more heat during the liquefaction process and improving the heat dissipation effect of the liquid cooling system; at the same time, the first cavity 20 can also serve as a buffer to prevent the liquid insulating working medium from blocking the flow channel outlet 11 due to backflow in the above three situations.

[0087] By returning the liquid insulating medium separated in the first cavity 20 to the liquid cooling node 10 through the liquid outlet 24 , the liquid insulating medium can be prevented from blocking the second inlet 22 , thereby further preventing the flow channel outlet 11 of the liquid cooling node 10 from being blocked.

[0088] In the embodiment of the present application, by setting a first cavity 20 between the liquid cooling node 10 and the condenser 30 to perform gas-liquid separation and block backflow, not only the economic cost and energy cost required for deploying and operating the gas-liquid separator can be saved, but also the situation where the flow channel outlet 11 is blocked can be avoided, thereby solving the layout restriction problem of the flow channel outlet 11 on the liquid cooling node 10, and the layout of the liquid cooling node 10 is freer.

[0089] The above is the basic architecture of the liquid cooling system provided in the embodiment of the present application. Figures 2 to 4The illustrated embodiment provides a more detailed description of the liquid cooling system provided in the embodiment of the present application.

[0090] See also Figure 2 , Figure 2 A schematic structural diagram of a second two-phase liquid cooling system provided in an embodiment of the present application.

[0091] in, Figure 2 The liquid cooling node 10, the first cavity 20 and the condenser 30 in the liquid cooling system are Figure 1 The functions, effects and working principles of the corresponding components in the specific examples are similar. For details, please refer to Figure 1 The relevant descriptions in the embodiment section will not be repeated here.

[0092] The liquid cooling system further includes a second cavity 40, which is used to separate the liquid and gas output by the condenser 30. In this embodiment, the first outlet 32 ​​of the condenser 30 is connected to the flow channel inlet 41 of the second cavity 40, the gas outlet 43 of the second cavity 40 is connected to the outside air, and the liquid outlet 42 of the second cavity 40 can be connected to the second inlet 22 of the first cavity, and can also be connected to the flow channel inlet 12 of the liquid cooling node 10. Figure 2 In a specific example, the liquid outlet 42 of the second cavity 40 can be connected to the second inlet 22b of the first cavity.

[0093] The liquid insulating medium outputted from the first outlet 32 ​​of the condenser 30 is returned to the liquid cooling node 10 through the second cavity 40 .

[0094] It is understandable that when the gas received by the first inlet 31 of the condenser 30 is a mixed gas of a gaseous insulating medium and air, the condenser 30 can use low-temperature cooling water or coolant to liquefy the insulating medium in the mixed gas, while the air portion remains in a gaseous state, and the liquid insulating medium and the air are input into the second cavity 40 together. Similar to the first cavity 20, the liquid insulating medium flows to the liquid outlet 42 under the action of gravity, and enters the first cavity 20 through the second inlet 22b; the air rises and flows to the outside through the gas outlet 43.

[0095] It is understandable that air can be dissolved in the liquid insulating medium. When the air is saturated, it will exist in the liquid insulating medium in the form of bubbles; these bubbles will interfere with the liquid cooling cycle and affect the heat dissipation performance. When a pump is configured in the liquid cooling system, these bubbles will also interfere with the rotation of the blades, and in severe cases, even damage the bearings of the pump. Therefore, it is necessary to reduce the air content in the liquid insulating medium, and the air mixed with the liquid insulating medium can be separated through the second cavity 40.

[0096] Optionally, the air outlet 43 is a switchable air outlet, which is used to open when the air pressure inside the liquid cooling system is too high or too low.

[0097] Optionally, the liquid cooling system further includes a solenoid valve 71 and a vacuum pump 81; the air outlet 43 is connected to a first end of the vacuum pump 81 through the solenoid valve 71, and a second end of the vacuum pump 81 is connected to external air.

[0098] When the air pressure inside the liquid cooling system is too high or too low, the solenoid valve 71 and the vacuum pump 81 can be opened to restore the internal air pressure of the liquid cooling system to a preset air pressure level. Specifically, when the air pressure inside the liquid cooling system is too high, the solenoid valve 71 and the vacuum pump 81 can be opened to control the vacuum pump 81 to extract the air in the second cavity 40 and quickly reduce the internal air pressure to a preset air pressure level; when the air pressure inside the liquid cooling system is too low, the solenoid valve 71 can be opened to allow outside air to enter the liquid cooling system.

[0099] It can be understood that the switching of the solenoid valve 71 is associated with the switching of the vacuum pump 81. When the vacuum pump 81 is turned off, the solenoid valve 71 is automatically closed to limit the entry of external air to the greatest extent.

[0100] Optionally, the second end of the vacuum pump 81 is connected to a recovery device, which is used to recover the insulating working fluid in the exhaust air of the liquid cooling system to reduce the pollution of the insulating working fluid to the environment.

[0101] In the embodiment of the present application, by setting up a second cavity 40 to perform another gas-liquid separation on the output fluid of the condenser 30, the air content of the liquid insulating working fluid in the liquid cooling system can be reduced; by setting the exhaust port of the liquid cooling system in the second cavity 40, compared with the scheme of directly setting the exhaust port in the cavity where the mixed gas of air and gaseous insulating working fluid is located, the content of insulating working fluid in the exhaust gas of the liquid cooling system can be reduced, thereby reducing the pollution of the environment by the insulating working fluid and protecting the environment.

[0102] See also Figure 3 , Figure 3 A schematic structural diagram of a third two-phase liquid cooling system provided in an embodiment of the present application.

[0103] in, Figure 3 The liquid cooling node 10, the first cavity 20 and the condenser 30 in the liquid cooling system are Figure 1 The functions, effects and working principles of the corresponding components in the specific examples are similar. For details, please refer to Figure 1 The relevant descriptions in the embodiment section will not be repeated here.

[0104] In a possible implementation, the liquid cooling system further includes a first pump body 82 , a first end of the first pump body 82 is connected to the liquid outlet 24 of the first cavity 20 , and a second end of the first pump body 82 is connected to the flow channel inlet 12 of each liquid cooling node 10 .

[0105] The first pump body 82 is used to quickly reduce the liquid level in the first cavity 20 to prevent the second inlet 22 from being liquid-sealed. Specifically, the first pump body 82 is used to pump the liquid insulating medium in the first cavity 20 to the component connected to the second end of the first pump body 82. For example, when the second end of the first pump body 82 is directly connected to the flow channel inlet 11 of the liquid-cooled node 10, the first pump body 82 is used to pump the liquid insulating medium in the first cavity 20 to the liquid-cooled node 10.

[0106] In another possible implementation, the liquid cooling system further includes a first pump body 82 , wherein a first end of the first pump body 82 is connected to an insulating working fluid source, and a second end of the first pump body 82 is connected to a flow channel inlet 12 .

[0107] The first pump body 82 is used to supplement the insulating working fluid to the liquid cooling system.

[0108] In another possible implementation, the liquid cooling system further includes a first pump body 82 , the first end of which is respectively connected to the liquid outlet 24 of the first cavity 20 and the insulating working medium source, and the second end of which is connected to the flow channel inlet 12 .

[0109] Optionally, the liquid cooling system further includes a subcooler 50 . The first inlet 51 of the subcooler 50 may be connected to the liquid outlet 24 of the first cavity 20 , and the first outlet 52 is connected to the flow channel inlet 12 of the liquid cooling node 10 .

[0110] The subcooler 50 may be a plate heat exchanger, specifically a plate heat exchanger, a jacket heat exchanger or an immersed coil heat exchanger. Figure 3 In a specific example, the subcooler 50 is an immersed coil-type heat exchanger. The subcooler 50 is used to further cool the liquid insulating medium so that the liquid insulating medium can absorb more heat after being transported to the liquid cooling node 10.

[0111] The subcooler 50 includes a second heat exchange unit 55 and a second cold source 56. The second cold source 56 is used to input a second cooling liquid into the second heat exchange unit 55; the liquid insulating medium collected in the first cavity 20 enters the subcooler 50 through the liquid outlet 24 and the first inlet 51, and the liquid insulating medium exchanges heat with the second cooling liquid in the second heat exchange unit 55 and is cooled, and the cooled liquid insulating medium flows back to the liquid cooling node 10.

[0112] Specifically, the first inlet 51 and the first outlet 52 of the supercooler 50 are also the first inlet 51 and the first outlet 52 of the second heat exchange unit 55 ; the second inlet 54 and the second outlet 53 of the second heat exchange unit 55 are connected to the second cold source 56 .

[0113] Optional, such as Figure 3As shown in the specific example, the second end of the first pump body 82 can be connected to the flow channel inlet 12 through the subcooler 50, the first end of the first pump body 82 is connected to the liquid outlet 24, and the second end is connected to the first inlet 51, which is used to pump the liquid insulating working fluid in the first cavity 20 to the subcooler 50, so as to transport the liquid insulating working fluid to the liquid cooling node 10 through the subcooler 50.

[0114] Optionally, the first end of the first pump body 82 is connected to the insulating working fluid source, and the second end is connected to the first inlet 51 ; the liquid outlet 24 of the first cavity 20 is connected to the first inlet 51 of the subcooler 50 , and the liquid outlet 24 is higher than the first inlet 51 .

[0115] The liquid insulating medium in the first cavity 20 can flow into the supercooler 50 under the action of gravity, and the first pump body 82 is used to pump the insulating medium in the insulating medium source to the supercooler 50 .

[0116] Optionally, a one-way valve is further provided at the second end of the first pump body 82 to prevent the liquid insulating medium from flowing back.

[0117] By arranging a condenser 30 and a subcooler 50 in the liquid cooling system to respectively assume the responsibilities of condensation and cooling, the vaporized insulating working fluid in the mixed gas can be first recovered through the condenser 30, and the air in the mixed gas can be separated at the same time, and then the insulating working fluid with higher purity can be cooled through the subcooler 50. While maximizing the heat absorption capacity of the insulating working fluid, the mixed moisture or other conductive components in the air can be reduced, thereby maintaining the purity of the insulating working fluid and improving the safety and heat dissipation efficiency of the liquid cooling system.

[0118] Optionally, the liquid cooling system also includes a second pump body 83, a first end of the second pump body 83 is connected to the first outlet 52 of the subcooler 50, and a second end of the second pump body 83 is connected to the flow channel inlet 12 of the liquid cooling node 10; the second pump body 83 is used to pump the insulating working fluid in the subcooler 50 to the liquid cooling node 10.

[0119] Optionally, a liquid reservoir 60 is further provided between the subcooler 50 and the second pump body 83, and the liquid reservoir 60 is used to store liquid insulating medium; a first end of the liquid reservoir 60 is connected to the first outlet 52 of the subcooler 50, and a second end is connected to the first end of the second pump body 83, that is, Figure 3 As shown in the specific example in FIG. 1 , the first outlet 52 of the subcooler 50 is connected to the flow channel inlet 12 of the liquid cooling node 10 through the liquid reservoir 60 and the second pump body 83 .

[0120] The second pump body 83 is used to pump the insulating working medium in the liquid reservoir 60 to the liquid cooling node 10 .

[0121] Optionally, a liquid level sensor may be provided in the liquid reservoir 60 to estimate the amount of insulating working fluid in the liquid cooling system according to the current liquid level in the liquid reservoir 60 .

[0122] Optionally, a third pump body 84 may be further provided between the second end of the liquid reservoir 60 and the flow channel inlet 12, wherein the first end of the third pump body 84 is connected to the second end of the liquid reservoir, and the second end of the third pump body 84 is connected to the flow channel inlet 12; the third pump body 84 is used as a backup pump body for the second pump body 83, and is also used to pump the liquid insulating working fluid in the liquid reservoir 60 into the liquid cooling node 10.

[0123] The third pump body 84 can be opened simultaneously with the second pump body 83 , and can also be opened when the second pump body 83 fails.

[0124] The second pump body 83 can be turned on when the heat source device enters the working state, and can be turned off when the heat source device exits the working state.

[0125] It is understandable that a one-way valve may be provided between the second end of the second pump body 83 and the flow channel inlet 12 to prevent the insulating medium from flowing back.

[0126] Optionally, the liquid cooling system also includes a bypass valve 74, a first end of the bypass valve 74 is connected to the second end of the second pump body 83 and / or the third pump body 84, and the second end of the bypass valve 74 is connected to the first end of the liquid reservoir 60; the bypass valve 74 is used to return part of the liquid insulating working fluid pumped by the second pump body 83 and / or the third pump body 84 to the liquid reservoir 60 when the liquid insulating working fluid in the liquid cooling node 10 is sufficient.

[0127] By providing the bypass valve 74 , it is possible to avoid the liquid replenishment speed being too fast, which would cause the liquid insulating medium in the liquid cooling node 10 to overflow and affect the heat dissipation effect.

[0128] By setting up a liquid reservoir 60, the liquid insulating working fluid cooled by the supercooler 50 is collected and then transported to the liquid cooling node 10 through the pump body. On the one hand, the total amount of insulating working fluid in the liquid cooling system can be increased, and on the other hand, the input fluid temperature of the second pump body 83 and / or the third pump body 84 can be more balanced and the inlet pressure can be more stable.

[0129] See also Figure 4 , Figure 4 A schematic diagram of the structure of a fourth two-phase liquid cooling system provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the liquid cooling system can be regarded as Figure 2 and Figure 3 The liquid cooling system shown includes a liquid cooling node 10 , a first cavity 20 , a condenser 30 , a second cavity 40 , a subcooler 50 and a liquid storage tank 60 .

[0130] in, Figure 4 In the specific example Figure 2 , Figure 3The functions, effects and working principles of the same components in the specific examples are similar. For details, please refer to Figure 2 and Figure 3 The relevant descriptions in the embodiment section will not be repeated here.

[0131] In a possible implementation, the liquid cooling system also includes a control unit (not shown in the figure) and a sensor, and also includes a valve and / or a pump body; the control unit is connected to the sensor, and is also connected to the valve and / or the pump body; the control unit is used to control the opening of the valve and the switch of the pump body according to the data collected by the sensor.

[0132] Among them, the liquid cooling system may include sensors arranged in various pipelines and components, specifically sensors for detecting parameters such as temperature, flow and pressure of the fluid in the pipeline, and sensors for detecting parameters such as air pressure and liquid level in the component cavity.

[0133] Among them, the control unit can be set in the liquid cooling system, specifically it can be a heat source device contained in a liquid cooling node of the liquid cooling system; it can also be set outside the liquid cooling system, for example, when the liquid cooling system is arranged in a computer room, the control unit can be the control system of the computer room.

[0134] The liquid cooling system may include valves arranged on each pipeline, and the valves have adjustable opening.

[0135] By setting up a control unit in the liquid cooling system, the valve opening and pump switch can be controlled according to the data collected by the sensor and the preset control conditions, thereby improving the intelligence level of the liquid cooling system.

[0136] In a possible implementation, the sensor includes a first pressure sensor P1 disposed in the first cavity 20; the condenser 30 also includes a first proportional valve 72, which can be disposed at the second outlet 33 or the second inlet 34 of the first heat exchange unit 35; the control unit is specifically used to control the opening of the first proportional valve 72 according to the first pressure data. Figure 4 In the specific example, the first proportional valve 72 is disposed at the second outlet 33 of the first heat exchange unit 35 .

[0137] The first proportional valve 72 is used to control the flow rate of the first coolant in the first heat exchange unit 35 .

[0138] Among them, the first pressure data is used to reflect the air pressure in the first cavity 20. Specifically, when the air pressure in the cavity is greater than the first pressure threshold, the control unit can increase the opening of the first proportional valve 72 to increase the unit flow of the first coolant in the first heat exchange unit 35, that is, to increase the cold output of the first cold source 36, so that the condenser 30 and the air in the second cavity 40 and the first cavity 20 through which the liquid insulating medium passes are contracted by the cold, thereby reducing the air pressure in the liquid cooling system until the air pressure in the cavity is reduced to a preset air pressure value; when the air pressure in the cavity is less than the second pressure threshold, the control unit can reduce the opening of the first proportional valve 72 to reduce the flow of the first coolant in the first heat exchange unit 35, that is, to reduce the cold output of the first cold source 36, so that the liquefaction rate of the insulating medium in the condenser 30, the second cavity 40 and the first cavity 20 is reduced, thereby increasing the air pressure in the liquid cooling system until the air pressure in the cavity is increased to a preset air pressure value.

[0139] It is understandable that since it is necessary to ensure the condensation effect of the condenser 30 so that it condenses the insulating working fluid instead of condensing the air, the opening adjustment of the first proportional valve 72 has a preset limit; when the opening of the first proportional valve 72 is adjusted to the preset limit and the air pressure problem still cannot be solved, it is necessary to further adjust the air pressure in the liquid cooling system through the air outlet 43 of the second cavity 40.

[0140] In a possible implementation, the control unit is specifically configured to control the opening of the solenoid valve 71 and the switch of the vacuum pump 81 according to the first pressure data in the first cavity 20 collected by the first pressure sensor P1.

[0141] The solenoid valve 71 is used to control the flow rate of air extraction or delivery.

[0142] Specifically, when the air pressure in the cavity is greater than the third pressure threshold, or is continuously greater than the first pressure threshold within the first preset time period, the control unit can open the solenoid valve 71 and the vacuum pump 81, adjust the opening of the solenoid valve 71 and control the vacuum pump 81 to extract the air in the second cavity 40 to quickly reduce the air pressure in the liquid cooling system until the air pressure in the cavity is reduced to the preset air pressure value; when the air pressure in the cavity is less than the fourth pressure threshold, or is continuously less than the second pressure threshold within the first preset time period, the control unit can open the solenoid valve 71, adjust the opening of the solenoid valve 71 to input outside air into the second cavity 40 to quickly restore the air pressure in the liquid cooling system until the air pressure in the cavity is reduced to the preset air pressure value.

[0143] The third pressure threshold is higher than the first pressure threshold, and the fourth pressure threshold is lower than the second pressure threshold.

[0144] It can be understood that when the input of outside air causes the air in the second cavity 40 to be input into the first cavity 20 along with the liquid insulating medium, the outside air will rise and then circulate back into the second cavity 40 again; since the temperature of the liquid insulating medium passing through the second cavity 40 is higher than the liquefaction temperature of water in the air, the purity of the liquid insulating medium finally input into the subcooler 50 will not be reduced due to the input of the outside air.

[0145] When the first pressure sensor P1 detects that the air pressure in the first cavity 20 is abnormal, the electromagnetic valve 71 and the vacuum pump 81 are opened to adjust the air pressure in the liquid cooling system, thereby improving the reliability of the operation of the liquid cooling system.

[0146] In one possible implementation, the first pump body 82 is connected to the liquid outlet 24 and the flow channel inlet 12; the sensor also includes a liquid level sensor LL arranged in the first cavity 20; the control unit is specifically used to control the switch of the first pump body 82 according to the liquid level data in the first cavity 20 collected by the liquid level sensor LL.

[0147] The liquid level data is used to reflect the liquid level of the liquid insulating medium in the first cavity 20 .

[0148] Optionally, when the liquid level is higher than the first liquid level threshold, the control unit may start the first pump body 82 for a second preset period of time.

[0149] The liquid level threshold can be determined according to the second inlet 22 of the first cavity 20, more specifically, according to the second inlet 22a directly connected to the liquid cooling node 10, so that after the control unit determines that the second inlet 22a is liquid-sealed, the liquid insulating medium in the first cavity 20 is pumped out in the shortest time to prevent liquid from accumulating in the pipeline connecting the flow channel outlet 11 and the second inlet 22a, resulting in the blockage of the flow channel outlet 11, thereby causing excessive pressure in the liquid cooling node 10. In some other embodiments, the liquid level threshold can also be set according to the height of the flow channel outlet 11 of the liquid cooling node 10.

[0150] The second preset period of time can be determined according to the liquid level threshold, that is, within the second preset period of time, the first pump body 82 can reduce the liquid level corresponding to the liquid level threshold to the preset liquid level.

[0151] Optionally, when the liquid level is higher than a second liquid level threshold, the control unit may turn on the first pump body 82 ; when the liquid level is lower than a third liquid level threshold, the control unit may turn off the first pump body 82 .

[0152] The third liquid level threshold is lower than the second liquid level threshold.

[0153] It is understandable that when the first pump body 82 is connected to the flow channel inlet 12 through other components, the first pump body 82 is used to quickly pump the liquid insulating medium in the first cavity 20 to the component connected to the second end of the first pump body 82 to reduce the liquid level in the first cavity 20. Figure 4 In a specific example, the first pump body 82 can pump the liquid insulating working medium in the first pump body 82 to the supercooler 50 .

[0154] When the liquid level data reflects that the current second inlet 22 or channel outlet 11 is liquid-sealed, the control unit turns on the first pump body 82 to quickly pump the liquid insulating medium in the first cavity 20 to the component connected to the second end of the first pump body 82 to lower the liquid level and release the liquid seal. This can avoid the liquid sealing phenomenon causing excessive pressure inside the liquid cooling node 10, thereby improving the reliability of the liquid cooling system.

[0155] In one possible implementation, the sensor includes a second pressure sensor P2 arranged at the second end of the second pump body 83, and the second pressure sensor P2 is used to collect second pressure data of the input fluid of the liquid cooling node 10; the control unit is specifically used to control the opening of the bypass valve 74 according to the second pressure data.

[0156] The second pressure data is used to reflect the fluid input pressure of the liquid cooling node 10. When the fluid input pressure is greater than the fifth pressure threshold, it indicates that the current liquid cooling node 10 has a small demand for replenishing the liquid insulating medium, and the control unit can increase the opening of the bypass valve 74 to increase the amount of liquid insulating medium refluxed to the liquid reservoir 60; when the fluid input pressure is less than the sixth pressure threshold, it indicates that the current liquid cooling node 10 has a large demand for replenishing the liquid insulating medium, and the control unit can decrease the opening of the bypass valve 74 to increase the amount of liquid insulating medium input to the liquid cooling node 10.

[0157] By setting the bypass valve 74 to adjust the replenishment speed of the liquid insulating working medium of the liquid cooling node 10, unnecessary waste of the insulating working medium due to excessive amount of the insulating working medium in the liquid cooling node 10 can be avoided.

[0158] In a possible implementation, the subcooler 50 also includes a second proportional valve 73, which can be arranged at the second outlet 53 or the second inlet 54 of the second heat exchange unit 55; the sensor also includes a temperature sensor T1 and a third pressure sensor P3, the temperature sensor T1 is arranged at the second end of the second pump body 83, and the third pressure sensor P3 is arranged at the first end of the second pump body 83; the control unit is used to control the opening of the second proportional valve 73 according to the temperature data collected by the temperature sensor T1 and the third pressure data collected by the third pressure sensor P3.

[0159] exist Figure 4In a specific example, the second proportional valve 73 is disposed at the second outlet 53 . The second proportional valve 73 is used to control the flow rate of the second coolant in the second heat exchange unit 55 .

[0160] Among them, the temperature data is used to reflect the temperature of the output fluid of the second pump body 83, and the third pressure data is used to reflect the pressure of the input fluid of the second pump body 83. When the temperature is higher than the sum of the saturation temperature corresponding to the pressure and the preset temperature threshold, it means that the supercooling degree of the input fluid of the second pump body 83 is insufficient, and the proportion of gas in the input fluid is too large, which may cause the second pump body 83 to work unstably or reduce its service life, and it is necessary to input an insulating medium with a lower temperature; at this time, the control unit can increase the opening of the second proportional valve 73, increase the cold input of the second cold source 56, and further reduce the temperature of the insulating medium input to the liquid cooling node 10.

[0161] When the temperature is lower than the dew point of the computer room, it means that the temperature of the insulating medium entering the liquid cooling node 10 is low, and condensed water may appear on the liquid cooling node 10 or the outer wall of the pipeline, and the temperature of the input insulating medium needs to be increased; at this time, the control unit can reduce the opening of the second proportional valve 73, reduce the cold input of the second cold source 56, and appropriately increase the temperature of the insulating medium input to the liquid cooling node 10.

[0162] By setting the second proportional valve 73 to adjust the cold input of the second cold source 56, the temperature of the insulating medium input to the liquid cooling node 10 can be adjusted in time, maximizing the use efficiency of the second cold source while ensuring the heat dissipation effect of the liquid cooling system.

[0163] It can be understood that according to the working principle of the liquid cooling system provided in the embodiment of the present application, Figure 1 Based on the embodiment shown, or Figure 4 Liquid cooling systems that reduce the above embodiments, or replace components or change the positions of the above two embodiments to obtain similar effects, all fall within the scope of protection of this application. Figures 1 to 3 Add on the liquid cooling system shown Figure 4 The sensors, valves or pumps in the system are then controlled by the control unit; Figure 4 The liquid cooling system shown is based on the basic minus some sensors, valves or pump body.

[0164] See also Figure 5 , Figure 5 The schematic diagram of the structure of the fifth two-phase liquid cooling system provided in the embodiment of the present application. Figure 4The liquid cooling system structure in the illustrated embodiment is similar, except that the liquid outlet 42 of the second cavity 40 is directly connected to the first inlet 51 of the subcooler 50; that is, the liquid insulating medium condensed by the condenser 30 does not enter the first cavity 20, but can directly enter the subcooler 50 for further cooling.

[0165] When the liquid outlet 42 of the second cavity 40 is connected to the first inlet 51 through the first cavity 20, the liquid insulating medium in the second cavity 40 can first enter the first cavity 20 and then be pumped to the supercooler 50 through the first pump body 82; for ease of description, this connection scheme can be called scheme 1. When the liquid outlet 42 of the second cavity 40 is directly connected to the first inlet 51, the liquid insulating medium in the second cavity 40 can be directly transported to the supercooler 50; this connection scheme can be called scheme 2.

[0166] Please refer again Figure 4 and Figure 5 Since the condenser 30 will produce a large pressure drop during the condensation process, the pressure loss caused by the pressure drop in Scheme 1 only affects the flow of the liquid insulating working medium from the second cavity 40 to the first cavity 20. After the liquid insulating working medium enters the first cavity 20, the first pump body 82 makes up for the pressure loss, so that the subsequent transportation process is not affected by the pressure drop; while in Scheme 2, the pressure drop will affect the transportation process of the liquid insulating working medium from the second cavity 40 to the supercooler 50 and then to the liquid storage tank 60 until the second pump body 83 replenishes the pressure.

[0167] Therefore, the adoption of solution 1 can reduce the impact of the pressure drop generated by the condenser 30 on the liquid cooling system and reduce the resistance to fluid transportation in the liquid cooling system.

[0168] On the other hand, when the first solution is adopted, the liquid insulating working fluid condensed by the condenser 30 merges with the liquid insulating working fluid discharged from the liquid-cooled node 10 in the first cavity 20, increasing the risk of the flow channel outlet 11 and the second inlet 22 of the liquid-cooled node 10 being liquid-sealed; while when the second solution is adopted, the liquid insulating working fluid flows directly from the second cavity 40 to the supercooler 50, which can reduce the risk of the flow channel outlet 11 and the second inlet 22 of the liquid-cooled node 10 being liquid-sealed.

[0169] See also Figure 6 , Figure 6 The sixth two-phase liquid cooling system provided in the present application is a schematic diagram of the structure of the second embodiment. Figure 4 The liquid cooling system in the illustrated embodiment has a similar structure, except that the positions of the subcooler 50 and the liquid reservoir 60 are swapped, and the liquid insulating medium from the second cavity 40 first passes through the liquid reservoir 60 , then passes through the subcooler 50 , and is finally pumped to the liquid cooling node 10 by the second pump body 83 .

[0170] The liquid outlet 42 of the second cavity 40 can be connected to the first cavity 20, and connected to the first end of the liquid reservoir 60 through the first cavity 20; or directly connected to the first end of the liquid reservoir 60. Figure 6 In the specific example, the liquid outlet 42 of the second cavity 40 is directly connected to the first end of the liquid reservoir 60 .

[0171] That is, the position exchange scheme of the subcooler 50 and the liquid storage 60 can be applied to Figure 4 The liquid cooling system shown can also be applied to Figure 5 Liquid cooling system shown.

[0172] In the embodiment of the present application, by setting the positional relationship between the subcooler 50 and the liquid reservoir 60, the liquid insulating medium first passes through the liquid reservoir 60 and then passes through the subcooler 50. This allows the heat exchange effect after the second proportional valve 73 is adjusted in opening to be fed back to the liquid cooling system more quickly, and the temperature adjustment is more timely.

[0173] The two-phase liquid cooling system provided in the embodiment of the present application is described above. Based on the two-phase liquid cooling system, a control method for controlling the two-phase liquid cooling system will be described below.

[0174] See also Figure 7 , Figure 7 The control method of the two-phase liquid cooling system provided in the embodiment of the present application is applicable to the above Figures 1 to 6 The two-phase liquid cooling system shown in any embodiment can be applied to the control unit of the liquid cooling system.

[0175] The method includes:

[0176] 701. Obtain data collected by sensors in a two-phase liquid cooling system.

[0177] Among them, after the liquid cooling system is started, the insulating medium begins to circulate between the various components through the pipeline; with the changes in the heat generation of the heat source device, the wear of the components and pipelines, the external temperature and air pressure and other factors, the parameters in the cavity of each component in the liquid cooling system and the parameters inside the pipeline connecting the various components will also change differently. At this time, the corresponding data can be collected by the sensors set in the cavity and the pipeline to determine whether the current operation of the liquid cooling system is normal, and when an abnormality occurs, the abnormal problem can be located according to the data, and the corresponding preset solution can be adopted to solve the abnormal problem.

[0178] 702. Control the opening of the valve and / or the switch of the pump in the two-phase liquid cooling system according to the data.

[0179] The valve has adjustable opening.

[0180] In a specific implementation, more operations performed by the control unit in the two-phase liquid cooling system control method provided in the embodiment of the present application can be found in Figures 1 to 6 The relevant parts of the two-phase liquid cooling system shown and its working principle will not be repeated here.

[0181] In the embodiment of the present application, by setting a control unit in the liquid cooling system, the valve opening and the pump switch can be controlled according to the data collected by the sensor and the preset control conditions. That is, when the data reflects that there is a problem with the liquid cooling system, the corresponding valve opening and pump switch are controlled to adjust the various parameters of the liquid cooling system to return to the preset parameter range, which can ensure the good operation of the liquid cooling system and improve the intelligence level of the liquid cooling system.

[0182] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A two-phase liquid cooling system, characterized in that: The system comprises: At least one liquid cooling node, the liquid cooling node is used to accommodate a heat source device and an insulating medium, the insulating medium can absorb the heat of the heat source device and transform from a liquid state to a gas state; the liquid cooling node includes a flow channel inlet and a flow channel outlet; A first cavity, the first cavity comprising a first inlet, a gas outlet, and a liquid outlet; and A condenser, the condenser is used to liquefy the gaseous insulating working medium into the liquid insulating working medium; the condenser comprises a first inlet and a first outlet; The first inlet of the first cavity is connected to the flow channel outlet of each of the liquid-cooled nodes, the air outlet of the first cavity is connected to the first inlet of the condenser, and the first outlet of the condenser and the liquid outlet of the first cavity are respectively connected to the flow channel inlet of each of the liquid-cooled nodes; The system further comprises a subcooler, wherein a first inlet of the subcooler is connected to a first outlet of the condenser, and the first outlet of the subcooler is connected to a flow channel inlet of each liquid cooling node; After the insulating working medium contained in the liquid-cooled node absorbs the heat of the heat source device, it can enter the first cavity through the flow channel outlet of the liquid-cooled node and the first inlet of the first cavity; the gaseous insulating working medium in the first cavity can enter the condenser through the gas outlet of the first cavity and the first inlet of the condenser, and after being liquefied by the condenser, enter the liquid-cooled node through the first outlet of the condenser, the subcooler and the flow channel inlet of the liquid-cooled node, and the subcooler is used to reduce the temperature of the insulating working medium passing through the condenser; the liquid insulating working medium in the first cavity can enter the liquid-cooled node through the liquid outlet of the first cavity and the flow channel inlet of the liquid-cooled node; The system further includes a control unit and a first pressure sensor, wherein the first pressure sensor is disposed in the first cavity; the condenser includes a first proportional valve, a first heat exchange unit and a first cold source, wherein the first cold source is connected to the first heat exchange unit, and the first cold source is used to input a first coolant into the first heat exchange unit, wherein the first coolant exchanges heat with the insulating medium received by the condenser in the first heat exchange unit, and the first proportional valve is used to control the flow rate of the first coolant in the first heat exchange unit; The first pressure sensor is used to collect first pressure data in the first cavity; The control unit is used to control the opening of the first proportional valve according to the first pressure data.

2. The system according to claim 1, characterized in that The first cavity further includes a second inlet, the second inlet of the first cavity is lower than the first inlet of the first cavity, and the second inlet of the first cavity is connected to the flow channel outlet of each liquid cooling node.

3. The system according to claim 2, characterized in that The flow channel outlet of each liquid cooling node is higher than the second inlet of the first cavity.

4. The system according to any one of claims 1 to 3, characterized in that The system further includes a control unit, a first pump body, and a liquid level sensor disposed in the first cavity, wherein a first end of the first pump body is connected to a liquid outlet of the first cavity, and a second end of the first pump body is respectively connected to a flow channel inlet of each liquid cooling node; The control unit is used to control the switch of the first pump body according to the liquid level data in the first cavity collected by the liquid level sensor, and the first pump body is used to pump the liquid insulating working medium in the first cavity to each liquid cooling node.

5. The system according to any one of claims 1 to 3, characterized in that The system further comprises a second pump body, wherein a first end of the second pump body is connected to a first outlet of the subcooler, and a second end of the second pump body is connected to a flow channel inlet of each liquid cooling node; The second pump body is used to pump the insulating working medium in the subcooler to each liquid cooling node.

6. The system according to claim 5, characterized in that The system further includes a control unit, a temperature sensor and a third pressure sensor, wherein the temperature sensor is disposed at the second end of the second pump body, and the third pressure sensor is disposed at the first end of the second pump body; the subcooler includes a second proportional valve, a second heat exchange unit and a second cold source, wherein the second cold source is connected to the second heat exchange unit, and the second cold source is used to input a second coolant into the second heat exchange unit, wherein the second coolant exchanges heat with the insulating medium received by the subcooler in the second heat exchange unit, and the second proportional valve is used to control the flow rate of the second coolant in the second heat exchange unit; The control unit is used to control the opening of the second proportional valve according to the temperature data collected by the temperature sensor and the third pressure data collected by the third pressure sensor.

7. The system according to claim 5, characterized in that The system also includes a liquid reservoir, a first end of which is connected to the first outlet of the supercooler, and a second end of which is connected to the first end of the second pump body; the liquid reservoir is used to store the insulating working medium in liquid state, and the second pump body is used to pump the insulating working medium in the liquid reservoir to the liquid cooling node.

8. The system according to claim 7, characterized in that The system comprises a control unit, a second pressure sensor and a bypass valve, wherein the first end of the bypass valve is connected to the second end of the second pump body, and the second end of the bypass valve is connected to the first end of the liquid reservoir; the second pressure sensor is arranged at the second end of the second pump body, and the second pressure sensor is used to collect second pressure data of the output fluid of the second pump body; The control unit is used to control the opening degree of the bypass valve according to the second pressure data.

9. The system according to any one of claims 1 to 3, characterized in that The system further comprises a second cavity, wherein a flow channel inlet of the second cavity is connected to the first outlet of the condenser, a liquid outlet of the second cavity is connected to the flow channel inlet of the liquid cooling node, and an air outlet of the second cavity is connected to the outside air.

10. The system according to claim 9, characterized in that The system further includes a control unit, a solenoid valve, a vacuum pump and a first pressure sensor; the air outlet of the second cavity is connected to the outside air through the solenoid valve and the vacuum pump, and the first pressure sensor is arranged in the first cavity; The control unit is used to control the opening of the solenoid valve and the switch of the vacuum pump according to the first pressure data in the first cavity collected by the first pressure sensor; The vacuum pump is used to restore the air pressure in the first cavity to a preset air pressure value.

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