A pump-driven two-phase liquid cooling system with online liquid replenishment function

Abstract

The utility model relates to the field of liquid cooling and heat dissipation, and specifically discloses a pump-driven two-phase liquid cooling system with an online liquid replenishment function, including a working medium circulation pipeline, an upper gas-liquid separator, a lower gas-liquid separator, a pressure relief bypass, a liquid replenishment valve, a liquid replenishment water tank, a liquid replenishment pump and a control circuit; the lower gas-liquid separator is connected in series between the circulation pump and the condenser of the working medium circulation pipeline; and the lower end of the upper gas-liquid separator is connected to the upper end of the lower gas-liquid separator through a first solenoid valve; the liquid replenishment water tank is connected to the upper end of the lower gas-liquid separator through a pressure relief bypass, and an exhaust pressure relief valve is provided on the pressure relief bypass; the liquid replenishment water tank is connected to the upper end of the upper gas-liquid separator through a liquid replenishment pipeline, and a liquid replenishment pump and a liquid replenishment valve are provided on the liquid replenishment pipeline. The utility model realizes the pressure relief and liquid replenishment self-circulation of the circulating working medium, and provides better hardware conditions for automatic liquid replenishment and pressure control.

Description

Technical Field

[0001] The utility model relates to the field of liquid cooling and heat dissipation, in particular to a pump-driven two-phase liquid cooling system with an online liquid replenishing function. Background Art

[0002] The pump-driven two-phase cold plate liquid cooling system is an advanced heat dissipation technology that is widely used in high heat density equipment such as data centers, servers, and IGBTs. It uses liquid as the cooling medium and drives the liquid to circulate inside the liquid cold plate through a pump to achieve efficient heat dissipation of the heating components. However, conventional single-phase cold plate liquid cooling technology has certain requirements for the use environment. In certain specific environments, such as extreme temperature or humidity conditions, when the liquid cooling system is under-loaded with insufficient heat source, condensed water will appear at the load end / liquid cold plate / system pipeline, which will have a serious impact on the normal operation of the electronic equipment and even cause equipment damage.

[0003] In the pump-driven two-phase cold plate liquid cooling system, the cooling liquid flows through the microchannels inside the liquid cold plate under the drive of the pump, absorbing the heat of the heating element through heat conduction and convection. As the temperature of the liquid increases, part of the liquid will undergo a phase change from liquid to gas, forming a gas-liquid mixture. This phase change process will absorb a large amount of heat, thereby achieving efficient heat dissipation.

[0004] However, the existing pump-driven two-phase cold plate liquid cooling technology generally has the problem of a single working mode of the liquid replenishment and pressure relief system. When the pump-driven two-phase liquid cooling system is replenishing liquid, the system still needs to operate stably. The replenishment process is accompanied by the phase change of the working fluid. The temperature and pressure of the working fluid in the liquid storage tank change at any time, and there is a risk of liquid backflow. If the liquid is not replenished in time, there will be too little working fluid in the entire system, the circulation pump will lack liquid, and the system cannot operate normally; too much internal working fluid will cause the system pressure to be too high, the heat exchange efficiency of the heat exchange plate will be low, and the evaporation temperature will be too high. Utility Model Content

[0005] In order to overcome the above-mentioned problems, the utility model provides a pump-driven two-phase liquid cooling system with an online liquid replenishing function.

[0006] The technical solution adopted by the utility model is: a pump-driven two-phase liquid cooling system with online liquid replenishment function, comprising: a working medium circulation pipeline, an upper gas-liquid separator, a lower gas-liquid separator, a pressure relief bypass, a liquid replenishment valve, a liquid replenishment water tank, a liquid replenishment pump and a control circuit;

[0007] The working medium circulation pipeline is provided with a circulation pump, an evaporator and a condenser in sequence;

[0008] The lower gas-liquid separator is connected in series between the circulation pump and the condenser;

[0009] The upper gas-liquid separator is arranged above the lower gas-liquid separator, and the lower end of the upper gas-liquid separator is connected to the upper end of the lower gas-liquid separator through a first solenoid valve;

[0010] The liquid replenishing water tank is connected to the upper end of the lower gas-liquid separator through the pressure relief bypass, and the pressure relief bypass is provided with an exhaust pressure relief valve;

[0011] The liquid replenishment water tank is connected to the upper end of the upper gas-liquid separator through a liquid replenishment pipeline, and a liquid replenishment pump and a liquid replenishment valve are provided on the liquid replenishment pipeline;

[0012] A first liquid level sensor is provided in the upper gas-liquid separator, and a first pressure sensor is provided in the lower gas-liquid separator. The first pressure sensor, the first liquid level sensor, the liquid replenishing pump, the liquid replenishing valve and the first solenoid valve are electrically connected to the control circuit respectively.

[0013] Preferably, a second pressure sensor is provided in the upper gas-liquid separator, and a second liquid level sensor is provided in the lower gas-liquid separator, and the second pressure sensor and the second liquid level sensor are electrically connected to the control circuit respectively.

[0014] Preferably, a filling port is provided at the upper end of the liquid replenishment water tank.

[0015] Preferably, a second solenoid valve is provided on the filling port, and the control circuit is electrically connected to the second solenoid valve.

[0016] Preferably, the liquid replenishing water tank is connected to the exhaust pressure relief valve via a hose.

[0017] Preferably, the liquid replenishment water tank is provided with a cold source for cooling the working fluid in the liquid replenishment water tank.

[0018] The beneficial effects of the utility model are:

[0019] By setting up two gas-liquid separator structures in series and arranging a replenishment water tank to connect the pressure relief valve and the replenishment pump, while realizing automatic online replenishment, the internal high pressure enters the replenishment water tank through the pressure relief valve for storage. When the system lacks pressure and the liquid level is too low, it can be replenished to the gas-liquid separator through the power of the replenishment pump. There is no need to connect an additional replenishment tank, thus realizing the pressure relief and replenishment self-circulation of the circulating working fluid, providing better hardware conditions for automatic replenishment and pressure control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0022] In the figure: 1. upper gas-liquid separator; 2. lower gas-liquid separator; 201. first solenoid valve; 3. replenishing water tank; 301. replenishing valve; 302. pressure relief pipe; 303. exhaust pressure relief valve; 304. filling port; 4. replenishing pump; 5. circulating pump; 6. condenser; 7. evaporator. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 , is the first embodiment of the utility model, and this embodiment specifically discloses a pump-driven two-phase liquid cooling system with an online liquid replenishment function, comprising: a working medium circulation pipeline, an upper gas-liquid separator 1, a lower gas-liquid separator 2, a pressure relief bypass, a liquid replenishment valve 301, a liquid replenishment water tank 3, a liquid replenishment pump 4 and a control circuit;

[0025] The working medium circulation pipeline is provided with a circulation pump 5, an evaporator 7 and a condenser 6 in sequence;

[0026] The lower gas-liquid separator 2 is connected in series between the circulation pump 5 and the condenser 6;

[0027] The upper gas-liquid separator 1 is arranged above the lower gas-liquid separator 2, and the lower end of the upper gas-liquid separator 1 is connected to the upper end of the lower gas-liquid separator 2 through a first solenoid valve 201;

[0028] The liquid replenishing water tank 3 is connected to the upper end of the lower gas-liquid separator 2 through the pressure relief bypass, and the pressure relief bypass is provided with an exhaust pressure relief valve 303;

[0029] The liquid replenishment water tank 3 is connected to the upper end of the upper gas-liquid separator 1 through a liquid replenishment pipeline, and a liquid replenishment pump 4 and a liquid replenishment valve 301 are provided on the liquid replenishment pipeline;

[0030] The upper gas-liquid separator 1 is provided with a first liquid level sensor, the lower gas-liquid separator 2 is provided with a first pressure sensor, and the first pressure sensor, the first liquid level sensor, the refilling pump 4, the refilling valve 301 and the first solenoid valve 201 are electrically connected to the control circuit respectively.

[0031] This embodiment adopts the form of connecting the upper gas-liquid separator 1 and the lower gas-liquid separator 2 in series, that is, it is used as a liquid storage tank and also plays the role of a gas-liquid separator. By setting a liquid replenishment water tank 3 to connect the pressure relief bypass and the liquid replenishment pump 4, the working fluid discharged from the pressure relief bypass when the system is under high pressure can be stored in the liquid replenishment water tank 3 and then replenished to the system through the power of the liquid replenishment pump 4 when the system lacks pressure and the liquid level is too low, without the need to connect an additional liquid replenishment tank, so that the internal self-circulation of the working fluid in the system is realized, providing better hardware conditions for automatic liquid replenishment and pressure control.

[0032] When the system operates normally, the first solenoid valve 201 opens automatically, and the upper gas-liquid separator 1 and the lower gas-liquid separator 2 simultaneously play the role of pressure buffering and regulating of the working medium circulation pipeline.

[0033] When the control circuit detects the need for external fluid replenishment through the first pressure sensor or the second pressure sensor, the first solenoid valve 201 is automatically closed, and the upper gas-liquid separator 1 is isolated from the lower gas-liquid separator 2. The lower gas-liquid separator 2 still plays a pressure regulating role to ensure the normal operation of the system. Thereafter, the fluid replenishment valve 301 is opened, and the circulating working fluid in the fluid replenishment tank 3 enters the upper gas-liquid separator 1 through the fluid replenishment pump 4. The control circuit completes the fluid replenishment after the fluid replenishment reaches a certain level based on the reading of the first liquid level sensor, first closes the fluid replenishment pump 4 and the fluid replenishment valve 301, and then opens the first solenoid valve 201. The liquid flows from the upper gas-liquid separator 1 to the lower gas-liquid separator 2 by gravity, thereby realizing the online automatic fluid replenishment function of the heat dissipation / refrigeration system without stopping.

[0034] The following is the second embodiment of the utility model. This embodiment is a specific embodiment of the first embodiment, which is used to cool the server in the immersed machine room cabinet. The working fluid used is a two-phase electronic fluorinated liquid with a low boiling point (such as FC-72 of 3M Company) or a low boiling point refrigerant (such as R1366mzz of Chemours Company). The working heat of the server chip is above 85 degrees Celsius. The system design controls the temperature, saturated vapor pressure, and flow rate of the refrigerant inside the system to achieve sufficient boiling heat exchange inside the liquid cold plate. The plate heat exchanger (i.e., evaporator 7) immersed in the immersed machine room cabinet absorbs the heat of the insulating coolant, causing the working fluid to absorb heat and evaporate. The working fluid vapor enters the circulation pump 5 through the lower gas-liquid separator 2, and enters the condenser 6 (heat exchange plate with an external cold source) after pressurization. The working fluid vapor releases heat and condenses into liquid working fluid.

[0035] A second pressure sensor is provided in the upper gas-liquid separator 1, and a second liquid level sensor is provided in the lower gas-liquid separator 2. The second pressure sensor and the second liquid level sensor are electrically connected to the control circuit respectively, and are used to supplement the control circuit's ability to detect system pressure and liquid level during fluid replenishment, so that fluid replenishment can be stopped in time when an abnormality occurs during the fluid replenishment process.

[0036] The upper end of the liquid replenishing water tank 3 is provided with a filling port 304 for replenishing liquid when the working medium in the liquid replenishing water tank 3 is less.

[0037] Preferably, a second solenoid valve is provided on the filling port 304, and the control circuit is electrically connected to the second solenoid valve. A cold source is provided in the replenishment water tank 3 for cooling the working medium in the replenishment water tank 3. When replenishment and pressure relief are not performed, the second solenoid valve is closed to reduce the evaporation of the working medium, and the cold source actively cools the working medium in the replenishment water tank 3, thereby condensing the working medium vapor in the replenishment water tank 3 and reducing the pressure in the replenishment water tank 3.

[0038] The liquid replenishing water tank 3 of this embodiment is connected to the exhaust pressure relief valve 303 through a hose, which plays a role of buffering and protecting the entire system during the pressure relief process.

[0039] The above specific embodiments further describe the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above are only specific embodiments of the utility model and are not intended to limit the protection scope of the utility model. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A pump-driven two-phase liquid cooling system with online liquid replenishment function, characterized in that: It includes a working medium circulation pipeline, an upper gas-liquid separator, a lower gas-liquid separator, a pressure relief bypass, a liquid replenishing valve, a liquid replenishing water tank, a liquid replenishing pump and a control circuit; The working medium circulation pipeline is provided with a circulation pump, an evaporator and a condenser in sequence; The lower gas-liquid separator is connected in series between the circulation pump and the condenser; The upper gas-liquid separator is arranged above the lower gas-liquid separator, and the lower end of the upper gas-liquid separator is connected to the upper end of the lower gas-liquid separator through a first solenoid valve; The liquid replenishing water tank is connected to the upper end of the lower gas-liquid separator through the pressure relief bypass, and the pressure relief bypass is provided with an exhaust pressure relief valve; The liquid replenishment water tank is connected to the upper end of the upper gas-liquid separator through a liquid replenishment pipeline, and a liquid replenishment pump and a liquid replenishment valve are provided on the liquid replenishment pipeline; A first liquid level sensor is provided in the upper gas-liquid separator, and a first pressure sensor is provided in the lower gas-liquid separator. The first pressure sensor, the first liquid level sensor, the liquid replenishing pump, the liquid replenishing valve and the first solenoid valve are electrically connected to the control circuit respectively.

2. A pump-driven two-phase liquid cooling system with online liquid replenishment function according to claim 1, characterized in that: A second pressure sensor is provided in the upper gas-liquid separator, and a second liquid level sensor is provided in the lower gas-liquid separator. The second pressure sensor and the second liquid level sensor are electrically connected to the control circuit respectively.

3. The pump-driven two-phase liquid cooling system with online liquid replenishment function according to claim 1, characterized in that: A filling port is arranged at the upper end of the liquid replenishing water tank.

4. A pump-driven two-phase liquid cooling system with online liquid replenishment function according to claim 3, characterized in that: The filling port is provided with a second solenoid valve, and the control circuit is electrically connected to the second solenoid valve.

5. The pump-driven two-phase liquid cooling system with online liquid replenishment function according to claim 1, characterized in that: The liquid replenishing water tank is connected to the exhaust pressure relief valve through a hose.

6. The pump-driven two-phase liquid cooling system with online liquid replenishment function according to claim 1, characterized in that: The liquid replenishment water tank is provided with a cold source for cooling the working medium in the liquid replenishment water tank.

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