Liquid level inducement recognition and recovery system for non-closed phase change immersion cooling system

Abstract

The invention relates to a liquid level inducement recognition and recovery system for a non-closed phase change immersion cooling system. The problem that an existing cooling system lacks the capacity of recognizing and recovering a root cause of liquid level decline is effectively solved. According to the technical scheme, the liquid level inducement recognition and recovery system for the non-closed phase change immersion cooling system can monitor and compare the liquid level height of a cooling box body inside and outside a gas collecting hood and the temperature and pressure of a gas storage cavity in real time; whether liquid level decline is caused by evaporation aggravation due to insufficient overall medium or abnormal working conditions in the gas collecting hood is accurately judged, so that an accurate basis is provided for taking correct recovery measures; by integrating sensing of multiple parameters such as water level, temperature, pressure and the like, the system can automatically diagnose the liquid level state, judge inducements and execute corresponding gas pumping, liquid internal circulation or external liquid supplementing operation, the heat dissipation reliability, the medium utilization rate and the overall energy efficiency of the system are remarkably improved, and important practical value is achieved.

Description

Technical Field

[0001] This invention relates to the field of cooling system technology, and in particular to a liquid level cause identification and recovery system for non-closed phase change immersion cooling systems. Background Technology

[0002] With the continuous increase in the power density of electronic devices, especially the increasingly stringent heat dissipation requirements of heat-generating units such as data center servers and high-power chips, traditional air cooling and indirect liquid cooling technologies are gradually facing bottlenecks such as insufficient heat dissipation capacity, high energy consumption, and high noise. Phase change immersion cooling technology, as a highly efficient thermal management solution, directly immerses the heat-generating unit in a liquid phase change cooling medium with a low boiling point. Utilizing the principle that the medium absorbs a large amount of latent heat of vaporization when boiling, it can achieve extremely high heat dissipation efficiency and temperature uniformity.

[0003] Currently, phase change immersion cooling systems are mainly divided into two categories: fully enclosed and non-enclosed. While fully enclosed systems can effectively prevent the loss of cooling medium, they are complex in structure, expensive, and difficult to manage internal pressure changes. Non-enclosed systems have a relatively simple structure and are easier to maintain and expand, making them more attractive in practical applications, especially in experimental scenarios or scenarios requiring frequent equipment replacement. However, the core challenge of non-enclosed systems is that during the continuous boiling and condensation cycle, the total amount of liquid medium in the system will inevitably decrease slowly due to evaporation, entrainment, or escape in the form of non-condensable gases, resulting in an irreversible drop in liquid level. This drop in liquid level can lead to partial exposure of heating elements, generating localized hot spots, severely affecting the cooling effect, and even damaging the equipment.

[0004] Existing technologies typically employ simple level gauges combined with replenishment devices for passive replenishment. However, this approach lacks the ability to identify the root cause of the level drop and cannot distinguish whether it is due to normal consumption, leakage, or abnormal evaporation caused by abnormal system pressure / temperature. Consequently, the replenishment strategy is blind and cannot optimize the media circulation and condensation recovery process, resulting in media waste and reduced energy efficiency.

[0005] Therefore, developing a system that can intelligently identify the causes of liquid level drop and execute precise and proactive liquid level recovery strategies accordingly is of great significance for improving the reliability, energy efficiency, and economy of non-closed phase change immersion cooling systems. Summary of the Invention

[0006] To address the above issues, this invention provides a liquid level cause identification and recovery system for non-enclosed phase change immersion cooling systems. This system integrates multiple parameter sensors such as water level, temperature, and pressure, and combines them with overall system control. The system can automatically diagnose the liquid level status, determine the cause, and perform corresponding gas extraction, internal liquid circulation, or external liquid replenishment operations. This achieves intelligent and automated liquid level management, reduces manual maintenance costs and operational error risks, and significantly improves the system's heat dissipation reliability, media utilization, and overall energy efficiency.

[0007] A liquid level cause identification and recovery system for non-closed phase change immersion cooling systems includes: A cooling box, which is filled with a liquid phase change cooling medium and has a heating unit fixedly installed inside it, the heating unit being completely immersed in the liquid phase change cooling medium; The gas collection hood is installed outside the heating unit and there is a certain gap between its bottom end and the inner bottom wall of the cooling box. The area inside the gas collection hood, above the liquid phase change cooling medium, is the gas storage chamber. The dynamic monitoring mechanism is located at the top of the gas collection hood and can perform real-time dynamic monitoring of the environmental conditions inside the gas storage chamber at the top of the gas collection hood. The liquid level monitoring mechanism includes a first float level controller and a second float level controller. Both the first float level controller and the second float level controller are vertically fixedly installed on the inner bottom wall of the cooling tank. The first float level controller and the second float level controller are located inside and outside the gas collection hood, respectively. A gas delivery mechanism is located at the top of the gas collection hood and communicates with the gas storage chamber; A liquid delivery mechanism is located on the side of the gas collection hood and flows with the liquid phase change cooling medium inside the gas collection hood. The condensation mechanism has its input end connected to the gas delivery mechanism and the liquid delivery mechanism at the end furthest from the gas collection hood, and its output end immersed in the bottom of the cooling box.

[0008] Preferably, the dynamic monitoring mechanism includes a temperature sensor and a pressure sensor, both of which are fixedly installed on the top of the gas collection hood and their detection ends are inserted into the gas storage chamber.

[0009] Preferably, the gas collecting hood is equipped with a first float level controller that can monitor the liquid level of the liquid phase change cooling medium inside in real time, and a second float level controller that can monitor the liquid level between the gas collecting hood and the cooling tank in real time is provided.

[0010] Preferably, the gas delivery mechanism includes an extraction pipe, a first speed regulating valve, and a first circulating pump. The extraction pipe is fixedly connected to the top of the gas collection hood and communicates with the interior of the gas storage chamber. The first speed regulating valve is fixedly installed in the middle of the extraction pipe. The input end of the first circulating pump is connected to the end of the extraction pipe away from the gas collection hood.

[0011] Preferably, the liquid delivery mechanism includes a delivery pipe, a three-way solenoid valve, a connecting pipe, a second circulation pump, an inlet pipe, and a third circulation pump. The bottom end of the delivery pipe passes through the side of the gas collection hood, and the end end passes through the liquid phase change cooling medium inside the gas collection hood. The three-way solenoid valve is fixedly installed at the top of the delivery pipe, and both the connecting pipe and the inlet pipe are connected to the three-way solenoid valve.

[0012] Preferably, the input end of the second circulating pump is connected to the end of the connecting pipe away from the three-way solenoid valve, the output end of the third circulating pump is connected to the end of the inlet pipe away from the three-way solenoid valve, and its input end is connected to an external pipeline. The inlet pipe and the third circulating pump are connected in parallel in the middle of the delivery pipe and the connecting pipe through the three-way solenoid valve.

[0013] Preferably, the condensation mechanism includes a heat exchanger, a chiller unit, a drain pipe, and a second speed control valve. The input end of the heat exchanger is connected to the output ends of the first and second circulating pumps. The chiller unit is connected to the pipes inside the heat exchanger to form a circulation loop. The drain pipe is connected to the output end of the heat exchanger, and its outlet end passes through the bottom of the cooling box. The second speed control valve is fixedly installed in the middle of the drain pipe.

[0014] Preferably, the top of the liquid phase change cooling medium between the cooling box and the gas collection hood is covered with a covering oil layer to prevent its evaporation and loss. The covering oil layer is immiscible with the liquid phase change cooling medium and floats on the upper layer of the liquid phase change cooling medium.

[0015] Preferably, the bottom end of the heating unit is fixedly connected to a bracket that can support it in a suspended state, and the bracket is fixedly connected to the inner bottom wall of the cooling box.

[0016] Preferably, the bottom end of the conveying pipe, which is inserted into the gas collecting hood, is horizontally aligned with the middle of the heating unit, and the outlet end of the drain pipe, which is inserted into the bottom of the cooling box, is vertically aligned with the bottom of the heating unit.

[0017] The beneficial effects of the above technical solution are as follows: This liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system utilizes a gas collection hood, dynamic monitoring mechanism, and liquid level monitoring mechanism located outside the heating unit. The system can monitor and compare the liquid level inside the gas collection hood with that of the external cooling tank body, as well as the temperature and pressure of the gas storage chamber, in real time. When the liquid level changes, the system can comprehensively analyze these parameters to accurately determine whether the drop in liquid level is due to insufficient overall medium or to increased evaporation caused by abnormal operating conditions inside the gas collection hood. This provides a precise basis for taking appropriate recovery measures. Based on the cause identification results, the system can execute targeted recovery strategies through the coordinated operation of the gas delivery mechanism and the liquid delivery mechanism. By integrating multiple parameter sensors such as water level, temperature, and pressure, and combining them with overall system control, the system can automatically diagnose the liquid level status, determine the cause, and execute corresponding gas extraction, internal liquid circulation, or external liquid replenishment operations. This achieves intelligent and automated liquid level management, reduces manual maintenance costs and the risk of operational errors, and significantly improves the system's heat dissipation reliability, medium utilization rate, and overall energy efficiency, demonstrating significant practical value. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the cooling box of the present invention.

[0019] In the diagram: 1. Cooling tank; 2. Liquid phase change cooling medium; 3. Heating unit; 4. Gas collection hood; 5. Gas storage chamber; 6. Dynamic monitoring mechanism; 601. Temperature sensor; 602. Gas pressure sensor; 7. Liquid level monitoring mechanism; 701. First float level controller; 702. Second float level controller; 8. Gas delivery mechanism; 801. Suction pipe; 802. First speed control valve; 803. First circulation pump; 9. Liquid delivery mechanism; 901. Delivery pipe; 902. Three-way solenoid valve; 903. Connecting pipe; 904. Second circulation pump; 905. Liquid inlet pipe; 906. Third circulation pump; 10. Condensation mechanism; 1001. Heat exchanger; 1002. Chiller unit; 1003. Drain pipe; 1004. Second speed control valve; 11. Covering oil layer; 12. Support. Detailed Implementation

[0020] The foregoing and other technical contents, features and effects of the present invention are described in conjunction with the appendix below. Figures 1 to 2 As will be clearly shown in the detailed description of the embodiments, all structural contents mentioned in the following embodiments are based on the accompanying drawings.

[0021] A system for identifying and restoring liquid level causes in non-closed phase change immersion cooling systems, as shown in the attached document. Figure 1 and 2As shown, it includes a cooling box 1, which is filled with liquid phase change cooling medium 2 and a heating unit 3 is fixedly installed inside it. The bottom end of the heating unit 3 is fixedly connected to a support 12 that can support it in a floating state, and the support 12 is fixedly connected to the inner bottom wall of the cooling box 1. The heating unit 3 is completely immersed in the liquid phase change cooling medium 2. The heating unit 3 can be a power battery or other operating heat-generating equipment. When the heating unit 3 heats up, the surrounding liquid phase change cooling medium 2 will absorb heat and boil, and evaporate into a high-temperature gaseous phase change cooling medium that accumulates in the gas storage chamber 5 at the top of the gas collection hood 4. The bracket 12 can support the heating unit 3 in a suspended state. Compared with the heating unit 3 being directly installed at the bottom of the cooling box 1, the support of the bracket 12 can ensure that the bottom of the heating unit 3 is also in full contact with the liquid phase change cooling medium 2, and can promote the flow of the medium at the bottom of the heating unit 3, thereby enabling the multiple heating units 3 to achieve a better cooling effect. In one optional embodiment, the top of the liquid phase change cooling medium 2 between the cooling box 1 and the gas collection hood 4 is covered with a covering oil layer 11 to prevent its evaporation and loss. The covering oil layer 11 is immiscible with the liquid phase change cooling medium 2 and floats on the upper layer of the liquid phase change cooling medium 2. The liquid phase change cooling medium 2 can be a fluorinated liquid. The density of the covering oil layer 11 is less than the density of the liquid phase change cooling medium 2, so it can float on the upper layer of the liquid phase change cooling medium 2. Moreover, the volatility of oily substances is poor, so they can play a role in preventing the evaporation and loss of the liquid phase change cooling medium 2 below. They can effectively block the direct contact between the liquid phase change cooling medium 2 and the air, and significantly suppress its loss caused by natural evaporation and diffusion in non-working states.

[0022] The gas collecting hood 4 is installed outside the heating unit 3 and has a certain gap between its bottom end and the inner bottom wall of the cooling box 1. The area above the liquid phase change cooling medium 2 inside the gas collecting hood 4 is the gas storage chamber 5. Furthermore, the gas collecting hood 4 is a container with an open bottom and is placed on the outside of the heating unit 3. The heating unit 3 is located in the center of the gas collecting hood 4 and is surrounded by liquid phase change cooling medium 2. In the initial state, the liquid level of the liquid phase change cooling medium 2 inside the gas collecting hood 4 is at the same water level as the liquid level of the covering oil layer 11 outside the gas collecting hood 4.

[0023] The dynamic monitoring mechanism 6 is located at the top of the gas collection hood 4 and can perform real-time dynamic monitoring of the environmental conditions inside the gas storage chamber 5 at the top of the gas collection hood 4. Specifically, the dynamic monitoring mechanism 6 in this invention includes a temperature sensor 601 and a pressure sensor 602. Both the temperature sensor 601 and the pressure sensor 602 are fixedly installed at the top of the gas collection hood 4, and their detection ends are inserted into the gas storage chamber 5. The temperature sensor 601 and the pressure sensor 602 serve as the basis for the dynamic control of the entire system. Through the temperature sensor 601 and the pressure sensor 602, the temperature and pressure changes inside the gas storage chamber 5 can be monitored in real time, thereby facilitating the control unit to dynamically control each mechanism according to the situation.

[0024] The liquid level monitoring mechanism 7 includes a first float level controller 701 and a second float level controller 702. Both the first float level controller 701 and the second float level controller 702 are vertically fixed on the inner bottom wall of the cooling tank 1. The first float level controller 701 and the second float level controller 702 are located inside and outside the gas collection hood 4, respectively. The float level controller is a known technology and will not be described in detail here. The first float level controller 701 can monitor the liquid level of the liquid phase change cooling medium 2 inside the gas collection hood 4 in real time, and the second float level controller 702 can monitor the liquid level of the liquid phase change cooling medium 2 outside the gas collection hood 4 in real time. By simultaneously detecting the liquid level difference between the inside and outside of the gas collection hood 4, it can be determined whether the liquid phase change cooling medium 2 in the cooling tank 1 is insufficient overall or caused by increased evaporation due to abnormal operating conditions inside the gas collection hood 4.

[0025] The gas delivery mechanism 8 is located at the top of the gas collecting hood 4 and communicates with the gas storage chamber 5. Specifically, the gas delivery mechanism 8 includes a suction pipe 801, a first speed regulating valve 802, and a first circulation pump 803. The suction pipe 801 is fixedly connected to the top of the gas collecting hood 4 and communicates with the interior of the gas storage chamber 5. The first speed regulating valve 802 is fixedly installed in the middle of the suction pipe 801 and can adjust the delivery rate in the suction pipe 801. The input end of the first circulation pump 803 is connected to the end of the suction pipe 801 away from the gas collecting hood 4. The first circulation pump 803 operates to extract the high-temperature gaseous phase change cooling medium in the gas storage chamber 5 into the condensation mechanism 10 through the suction pipe 801.

[0026] Furthermore, the dynamic monitoring agency 6 and the liquid level monitoring agency 7 detected the following situations: 1. The first float level controller 701 and the second float level controller 702 detect the same liquid level; At this point, it is proven that the air pressure in the gas storage chamber 5 inside the gas collection hood 4 is the same as the external ambient air pressure, and the gas collection hood 4 is in normal working condition. At this point, the liquid level can be matched with the set liquid level. If the current liquid level is lower than the set liquid level height that can ensure good cooling effect, liquid phase change cooling medium 2 can be added to the cooling tank 1 to ensure that the system always has a good cooling effect. 2. The liquid level detected by the first float level controller 701 is higher than the liquid level detected by the second float level controller 702; This situation proves that the gas storage chamber 5 is under negative pressure. Observing the monitoring data of the pressure sensor 602, the pressure sensor 602 detected that the gas pressure in the gas storage chamber 5 is less than the standard atmospheric pressure, which indicates that the pumping speed of the first circulation pump 803 is greater than the heat absorption and evaporation speed of the liquid phase change cooling medium 2, making the gas storage chamber 5 under negative pressure. Therefore, the liquid level inside it will be higher than the outside. At this time, the operating power of the first circulation pump 803, the delivery rate of the first speed regulating valve 802, and the operating power of the condensing mechanism 10 can be appropriately reduced to reduce the pumping and condensation rates, thereby making the liquid levels inside and outside the gas collection hood 4 consistent, which can effectively reduce energy consumption. After the internal and external liquid levels are consistent, the overall liquid content is detected by the first float level controller 701 and the second float level controller 702, so as to select whether to add cooling medium according to the situation. 3. The liquid level detected by the first float level controller 701 is lower than the liquid level detected by the second float level controller 702; This situation proves that the air pressure inside the gas storage chamber 5 is greater than the external air pressure, while the outside of the gas collection hood 4 is not sealed. Therefore, the air pressure detected by the pressure sensor 602 must be greater than the standard atmospheric pressure, making the gas storage chamber 5 a high-pressure state. This forces some of the liquid phase change cooling medium 2 inside the gas collection hood 4 to the outside, resulting in the internal liquid level being lower than the external liquid level. It also proves that the pumping efficiency of the first circulation pump 803 cannot keep up with the amount of gas generated in the gas storage chamber 5, which will lead to a reduction in the cooling effect. The temperature sensor 601 can also detect that the gas storage chamber 5 is in a high-temperature state. At this time, the operating power of the first circulation pump 803, the delivery rate of the first speed regulating valve 802, and the operating power of the condensing mechanism 10 can be increased, so that the first circulation pump 803 can quickly draw the high-temperature gas in the gas storage chamber 5 through the suction pipe 801, thereby restoring the working conditions inside the gas collection hood 4 to the normal operating state, thus realizing the dynamic control of the overall cooling effect of the system.

[0027] A liquid delivery mechanism 9 is disposed on the side of the gas collecting hood 4 and flows with the liquid phase change cooling medium 2 inside the gas collecting hood 4. Specifically, the liquid delivery mechanism 9 includes a delivery pipe 901, a three-way solenoid valve 902, a connecting pipe 903, a second circulation pump 904, an inlet pipe 905, and a third circulation pump 906. The bottom end of the delivery pipe 901 passes through the side of the gas collecting hood 4, and the end end passes through the liquid phase change cooling medium 2 inside the gas collecting hood 4. One end of the 4 is horizontally aligned with the middle of the heating unit 3, which facilitates the direct extraction of the high-temperature liquid phase change cooling medium that has absorbed heat around the heating unit 3 and its cooling through the condensation mechanism 10; the three-way solenoid valve 902 is fixedly installed at the top of the delivery pipe 901 and both the connecting pipe 903 and the liquid inlet pipe 905 are connected to the three-way solenoid valve 902; the three-way solenoid valve 902 can control the connection between the delivery pipe 901 and the connecting pipe 903 or the connection between the delivery pipe 901 and the liquid inlet pipe 905 respectively; The input end of the second circulation pump 904 is connected to the end of the connecting pipe 903 away from the three-way solenoid valve 902. When the second circulation pump 904 is running, the three-way solenoid valve 902 can control the three-way solenoid valve 902 to connect the delivery pipe 901 and the connecting pipe 903. The second circulation pump 904 can extract the heat-absorbing high-temperature liquid phase change cooling medium in the gas collecting hood 4 through the connecting pipe 903 and the delivery pipe 901 and deliver it to the condensing mechanism 10. The output end of the third circulation pump 906 is connected to the end of the liquid inlet pipe 905 away from the three-way solenoid valve 902, and its input end is connected to the external liquid phase change cooling medium. The pipeline for medium 2 is connected, and the inlet pipe 905 and the third circulation pump 906 are connected in parallel in the middle of the delivery pipe 901 and the connecting pipe 903 through the three-way solenoid valve 902. When it is necessary to add liquid phase change cooling medium 2 into the cooling tank 1, the three-way solenoid valve 902 can be controlled to connect the delivery pipe 901 and the inlet pipe 905, and the external liquid phase change cooling medium can be directly delivered to the area around the heating unit 3 in the gas collection hood 4 through the third circulation pump 906. This can not only directly cool the heating unit 3, but also promote the flow of medium around the heating unit 3 and improve the cooling efficiency.

[0028] The condensing mechanism 10 has its input end connected to the ends of both the gas conveying mechanism 8 and the liquid conveying mechanism 9 away from the gas collection hood 4, and its output end immersed in the bottom of the cooling box 1. Specifically, the condensing mechanism 10 includes a heat exchanger 1001, a chiller unit 1002, a drain pipe 1003, and a second speed control valve 1004. The input end of the heat exchanger 1001 is connected to the output ends of the first circulating pump 803 and the second circulating pump 904. The chiller unit 1002 is connected to the piping inside the heat exchanger 1001 to form a circulation loop. The heat exchanger 1001 can recondense the high-temperature gaseous and liquid phase change cooling media entering it into a low-temperature liquid phase change cooling media. The heat exchange efficiency of the heat exchanger 1001 can be adjusted by changing the operating power of the chiller unit 1002, thus facilitating adjustment according to the system operating conditions. The dynamic adjustment of condensation efficiency makes the operating efficiency of each mechanism more matched, avoiding insufficient or excessive cooling. The drain pipe 1003 is connected to the output end of the heat exchanger 1001 and its outlet end passes through the bottom of the cooling box 1. The outlet end of the drain pipe 1003 at the bottom of the cooling box 1 is vertically aligned with the bottom of the heating unit 3. The low-temperature liquid phase change cooling medium discharged from the heat exchanger 1001 can be directly discharged to the bottom of the heating unit 3, thereby further promoting the liquid flow around the heating unit 3 and improving the cooling effect. The second speed regulating valve 1004 is fixedly installed in the middle of the drain pipe 1003. The second speed regulating valve 1004 can control the drain efficiency of the drain pipe 1003 and can be dynamically adjusted according to the overall operating status of the system to ensure the efficient operation of the entire cooling circuit.

[0029] Temperature sensor 601, air pressure sensor 602, first float water level controller 701, second float water level controller 702, first speed control valve 802, first circulation pump 803, three-way solenoid valve 902, second circulation pump 904, third circulation pump 906, chiller unit 1002 and second speed control valve 1004 are all electrically connected to the external control unit and are all electrically connected to the external circuit through wires.

[0030] The specific operating steps for the liquid level cause identification and recovery system used in non-closed phase change immersion cooling systems are as follows: 1. Inject sufficient liquid phase change cooling medium 2 into the cooling tank 1 to ensure that the heating unit 3 is completely submerged. A covering oil layer 11 is formed above the liquid surface between the cooling tank 1 and the gas collection hood 4. The external control unit is activated, causing the temperature sensor 601, air pressure sensor 602, first float water level controller 701, and second float water level controller 702 to enter the monitoring state. The three-way solenoid valve 902 is switched to the position that connects the delivery pipe 901 and the connecting pipe 903. The first circulation pump 803 runs continuously, drawing the high-temperature gaseous phase change cooling medium in the gas storage chamber 5 into the heat exchanger 1001 for condensation and heat exchange through the air extraction pipe 801, and then draining it back into the cooling tank 1 through the drain pipe 1003 to form an automatic circulating cooling loop. 2. Based on the numerical relationship between the dynamic monitoring mechanism 6 and the liquid level monitoring mechanism 7, the system executes one of the following three main control strategies: Operating Condition 1: Liquid levels inside and outside the gas collection hood 4 are balanced This indicates that the pressure inside and outside the gas collecting hood 4 is basically balanced, the system is operating smoothly, and there is no abnormal pressure in the gas storage chamber 5. The current liquid level is detected by the first float level controller 701 and the second float level controller 702 and compared with the system's set safe minimum liquid level. If the liquid level is sufficient, the system maintains the current operating parameters of each mechanism and continues to monitor. If the liquid level is insufficient, it is determined that the overall cooling medium of the system is consumed. The control unit switches the three-way solenoid valve 902 to the position that connects the delivery pipe 901 and the liquid inlet pipe 905, and starts the third circulation pump 906 to pump the liquid phase change cooling medium 2 in the external liquid storage device directly into the gas collecting hood 4 through the liquid inlet pipe 905 and the delivery pipe 901 until the liquid level is restored to the set range. After the liquid replenishment is completed, the three-way solenoid valve 902 switches back to the circulation cooling mode, and the third circulation pump 906 stops. Operating Condition 2: The liquid level inside the gas collection hood 4 is higher than that outside. The gas storage chamber 5 is determined to be under negative pressure because the pumping speed of the gas conveying mechanism 8 is higher than the evaporation rate of the medium at the heating unit 3. At this time, the control unit needs to reduce the opening of the first speed regulating valve 802, reduce the operating frequency of the first circulating pump 803 and the operating power of the chiller unit 1002, thereby weakening the condensing capacity of the heat exchanger 1001, thereby reducing the overall pumping intensity of the system, so that evaporation and pumping tend to be balanced. Operating Condition 3: The liquid level inside the gas collection hood 4 is lower than that outside. The gas storage chamber 5 is under high pressure. At this time, the pressure sensor 602 detects that the pressure in the gas storage chamber 5 is higher than the standard atmospheric pressure. This is because the pumping speed of the gas conveying mechanism 8 is lower than the evaporation rate of the medium, which causes steam to accumulate and the pressure to rise, forcing the liquid in the hood out. At this time, the control unit needs to increase the opening of the first speed regulating valve 802 and increase the operating frequency of the first circulation pump 803 to accelerate the extraction of high-temperature steam from the gas storage chamber 5. At the same time, the second circulation pump 904 is started to actively extract the high-temperature liquid medium that may be overheated around the heating unit 3 in the gas collection hood 4 through the conveying pipe 901 and send it into the heat exchanger 1001 along with the gas. The operating power of the chiller unit 1002 is increased to enhance the condensation efficiency of the heat exchanger 1001 and quickly condense the input gas and liquid into liquid. Alternatively, the opening of the second speed regulating valve 1004 can be appropriately increased to accelerate the return of the condensed low-temperature medium to the bottom of the cooling box 1 below the heating unit 3 through the drain pipe 1003, thereby quickly discharging excess steam and heat. 3. While the system is mainly processing gas phase balance, if the load of the heating unit 3 is detected to be continuously high, the control unit can periodically or actively start the second circulation pump 904 according to the temperature threshold to perform forced circulation cooling of the liquid medium, thereby further improving the heat exchange efficiency. 4. When the heating unit 3 stops working, the control unit stops the first circulation pump 803, the second circulation pump 904 and the chiller unit 1002 in sequence, adjusts the first speed regulating valve 802 and the second speed regulating valve 1004 to the safe opening, and resets the three-way solenoid valve 902 to the designated position, waiting for the next start command.

[0031] The above description is only for illustrating the present invention and should be understood as not being limited to the above embodiments. Various modifications that conform to the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A system for identifying and restoring liquid level causes in a non-enclosed phase change immersion cooling system, characterized in that, include: A cooling box (1) is filled with a liquid phase change cooling medium (2) and a heating unit (3) is fixedly installed inside it. The heating unit (3) is completely immersed in the liquid phase change cooling medium (2). The gas collection hood (4) is installed outside the heating unit (3) and its top area is a gas storage chamber (5). The dynamic monitoring mechanism (6) is set at the top of the gas collection hood (4) and can perform real-time dynamic monitoring of the environmental conditions inside the gas storage chamber (5) at the top of the gas collection hood (4). The liquid level monitoring mechanism (7) includes a first float water level controller (701) and a second float water level controller (702), both of which are vertically fixed on the inner bottom wall of the cooling box (1) and located on the inner and outer sides of the gas collection hood (4), respectively. Gas delivery mechanism (8) is located at the top of gas collection hood (4) and communicates with gas storage chamber (5); Liquid delivery mechanism (9) is located on the side of the gas collection hood (4) and flows with the liquid phase change cooling medium (2) inside the gas collection hood (4); The condensation mechanism (10) has its input end connected to the gas delivery mechanism (8) and the liquid delivery mechanism (9) at the end away from the gas collection hood (4), and its output end is immersed in the bottom of the cooling box (1).

2. The liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system according to claim 1, characterized in that, The dynamic monitoring mechanism (6) includes a temperature sensor (601) and a pressure sensor (602). The temperature sensor (601) and the pressure sensor (602) are both fixedly installed on the top of the gas collection hood (4) and their detection ends are both inserted into the gas storage chamber (5).

3. The liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system according to claim 1, characterized in that, The gas collecting hood (4) is equipped with a first float level controller (701) that can monitor the liquid level of the liquid phase change cooling medium (2) inside in real time, and a second float level controller (702) that can monitor the liquid level between the gas collecting hood (4) and the cooling box (1) is provided.

4. The liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system according to claim 1, characterized in that, The gas delivery mechanism (8) includes a suction pipe (801), a first speed regulating valve (802) and a first circulation pump (803). The suction pipe (801) is fixedly connected to the top of the gas collection hood (4) and communicates with the interior of the gas storage chamber (5). The first speed regulating valve (802) is fixedly installed in the middle of the suction pipe (801). The input end of the first circulation pump (803) is connected to the end of the suction pipe (801) away from the gas collection hood (4).

5. The liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system according to claim 4, characterized in that, The liquid delivery mechanism (9) includes a delivery pipe (901), a three-way solenoid valve (902), a connecting pipe (903), a second circulation pump (904), an inlet pipe (905), and a third circulation pump (906). The bottom end of the delivery pipe (901) passes through the side of the gas collection hood (4), and the end end passes through the liquid phase change cooling medium (2) inside the gas collection hood (4). The three-way solenoid valve (902) is fixedly installed at the top of the delivery pipe (901), and the connecting pipe (903) and the inlet pipe (905) are both connected to the three-way solenoid valve (902).

6. The liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system according to claim 5, characterized in that, The input end of the second circulating pump (904) is connected to the end of the connecting pipe (903) away from the three-way solenoid valve (902). The output end of the third circulating pump (906) is connected to the end of the inlet pipe (905) away from the three-way solenoid valve (902), and its input end is connected to an external pipeline. The inlet pipe (905) and the third circulating pump (906) are connected in parallel in the middle of the delivery pipe (901) and the connecting pipe (903) through the three-way solenoid valve (902).

7. The liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system according to claim 5, characterized in that, The condensation mechanism (10) includes a heat exchanger (1001), a chiller unit (1002), a drain pipe (1003), and a second speed control valve (1004). The input end of the heat exchanger (1001) is connected to the output ends of the first circulation pump (803) and the second circulation pump (904). The chiller unit (1002) is connected to the pipeline inside the heat exchanger (1001) to form a circulation loop. The drain pipe (1003) is connected to the output end of the heat exchanger (1001), and its outlet end is installed at the bottom of the cooling box (1). The second speed control valve (1004) is fixedly installed in the middle of the drain pipe (1003).

8. The liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system according to claim 1, characterized in that, The top of the liquid phase change cooling medium (2) between the cooling box (1) and the gas collection hood (4) is covered with a covering oil layer (11) to prevent its evaporation and loss. The covering oil layer (11) is immiscible with the liquid phase change cooling medium (2) and floats on the upper layer of the liquid phase change cooling medium (2).

9. The liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system according to claim 1, characterized in that, The bottom end of the heating unit (3) is fixedly connected to a bracket (12) that can support it in an air-filled state, and the bracket (12) is fixedly connected to the inner bottom wall of the cooling box (1).

10. The liquid level cause identification and recovery system for a non-enclosed phase change immersion cooling system according to claim 7, characterized in that, The bottom end of the conveying pipe (901) is inserted into the gas collecting hood (4) and is horizontally aligned with the middle of the heating unit (3). The outlet end of the drain pipe (1003) is inserted into the bottom of the cooling box (1) and is vertically aligned with the bottom of the heating unit (3).

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