Liquid nitrogen cooling immersed server heat dissipation system

Abstract

The utility model relates to a liquid nitrogen cooling immersed server heat dissipation system, which comprises a liquid nitrogen storage and supply system, a liquid nitrogen conveying system, a cooling system, a nitrogen discharge system and a control system which are connected with one another through pipelines, one end of the liquid nitrogen storage and supply system is connected to an external tank car unloading port, and the other end of the liquid nitrogen conveying system is connected to an external tank car unloading port. The other end of the liquid nitrogen storage and supply system is connected with the cooling system through the liquid nitrogen conveying system, the cooling system is connected with the nitrogen discharging system to discharge nitrogen, and the liquid nitrogen storage and supply system, the liquid nitrogen conveying system, the cooling system and the nitrogen discharging system are all controlled by the control system. The device has the advantages of being simple and reasonable in structure, convenient to install and use, safe, efficient, energy-saving, environment-friendly and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of cryogenic engineering and relates to a liquid nitrogen-cooled immersion server heat dissipation system. Background Art

[0002] As the power consumption of various chips continues to increase, the heat dissipation of servers has become an issue that data centers must consider. It is known that electronic equipment is immersed in a single-phase or two-phase immersion cooling system using liquids such as fluorinated liquid and insulating oil as coolants, and the coolant is directly in contact with the electronic equipment to remove heat from the electronic equipment. However, under the known immersion cooling technology, the electronic equipment itself is still at a relatively high operating temperature, and its actual performance is restricted by the high temperature; if you want to make the electronic equipment have better performance, you need to lower its operating temperature.

[0003] In scenarios such as extreme overclocking that only involve a single host and are used in a small range, it is known that liquid nitrogen is used as a cooling source for electronic equipment and the nitrogen is discharged on site. However, its use is limited to short-term and small-scale use, because the nitrogen produced by the evaporation of liquid nitrogen is non-toxic but suffocating. When used for the heat dissipation of a large number of servers, the nitrogen must be discharged outdoors in a centralized manner, considering the safety of the computer room as a confined space. According to the air humidity requirements of a normal data center, condensation will inevitably occur when air comes into contact with liquid nitrogen or non-insulated pipes with liquid nitrogen flowing. Insulation measures must be considered to prevent condensation from damaging the server. The temperature of liquid nitrogen is very low, and when liquid nitrogen leaks, it may cause some low-temperature-resistant materials in the server to become cold and brittle, damaging the server. The amount of liquid nitrogen used in a data center is much larger than the short-term usage of a single host, and the storage and supply issues involving a large amount of liquid nitrogen need to be solved.

[0004] Directly immersing the server in liquid nitrogen is not generally applicable under existing technical conditions: the electronic components, chassis, cables and signal cables of the server are not designed for the temperature of liquid nitrogen. They will be directly damaged when immersed in liquid nitrogen. Only low-temperature and high-voltage resistant electronic components, chassis, cables and signal cables designed specifically for this scenario can work normally. When liquid nitrogen vaporizes, it releases a large amount of nitrogen. The cooled server and liquid nitrogen must be placed in a special pressure container. The pressure container must also have cables passing through the container wall to transmit power and signals, and the perforations must have reliable sealing measures. In general, directly immersing the server in liquid nitrogen is costly and has a narrow scope of application.

[0005] The data center is not suitable for installing complex large-scale liquid nitrogen circulation refrigeration equipment, and its personnel are not capable of operating and maintaining large-scale liquid nitrogen circulation refrigeration equipment. When using liquid nitrogen refrigeration in large quantities, the equipment should be simplified as much as possible.

[0006] Therefore, a liquid nitrogen-cooled immersion server heat dissipation system is designed to overcome the above problems. Utility Model Content

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a liquid nitrogen cooled immersion server heat dissipation system which has a simple and reasonable structure, is easy to install and use, is safe and efficient, and is energy-saving and environmentally friendly.

[0008] The utility model is realized through the following technical scheme: a liquid nitrogen cooled immersion server heat dissipation system, which comprises a liquid nitrogen storage and supply system, a liquid nitrogen delivery system, a cooling system, a nitrogen discharge system and a control system, which are connected to each other through pipelines, one end of the liquid nitrogen storage and supply system is connected to an external tank truck unloading port, and the other end is connected to the cooling system through the liquid nitrogen delivery system, the cooling system is connected to the nitrogen discharge system for nitrogen discharge, and the liquid nitrogen storage and supply system, the liquid nitrogen delivery system, the cooling system and the nitrogen discharge system are all controlled by the control system.

[0009] Preferably, the liquid nitrogen storage and supply subsystem mainly comprises a self-boosting device, a liquid nitrogen outlet, a liquid nitrogen inlet and a vacuum liquid nitrogen storage tank, wherein the vacuum liquid nitrogen storage tank is respectively provided with a liquid nitrogen outlet and a liquid nitrogen inlet, the liquid nitrogen outlet is connected to the liquid nitrogen delivery system, the liquid nitrogen inlet is connected to the unloading port of the tank truck, and a self-boosting device is installed in the vacuum liquid nitrogen storage tank, through which the liquid nitrogen flows into the liquid nitrogen delivery system.

[0010] Preferably, the liquid nitrogen delivery system is composed of a vacuum pipeline and a cryogenic valve. The liquid nitrogen from the vacuum liquid nitrogen storage tank through the liquid nitrogen outlet flows into the vacuum pipeline. A cryogenic valve is provided at the end of the vacuum pipeline. The cryogenic valve is used to cut off the connection between the liquid nitrogen delivery system and the cooling system during maintenance. After the liquid nitrogen flows out of the vacuum pipeline, it flows into the cooling system through the cryogenic valve.

[0011] Preferably, the cooling system consists of a cabinet and a heat exchanger, wherein the heat exchanger is placed in the cabinet, and coolant is poured into the cabinet around the heat exchanger, the inlet end of the heat exchanger is connected to a vacuum pipe, and the outlet end is connected to a nitrogen exhaust system, a coolant level meter and a cabinet temperature sensor are also installed on the cabinet, and an inlet low-temperature control valve and an outlet temperature sensor are respectively installed on the inlet and outlet ends of the heat exchanger.

[0012] Preferably, the nitrogen exhaust system consists of a pipeline with a muffler and a high-altitude exhaust port, wherein the outlet end of the heat exchanger is connected to one end of the pipeline, and a high-altitude exhaust port is installed at the outlet of the other end, and a muffler is installed behind the high-altitude exhaust port, which reduces the pressure of nitrogen to normal pressure before discharging it.

[0013] Preferably: the coolant level meter, cabinet temperature sensor, inlet low-temperature control valve, and outlet low-temperature control valve are all connected to a control system, which is a PLC controller. The PLC controller is connected to the coolant level meter, cabinet temperature sensor, inlet low-temperature control valve, and outlet low-temperature control valve through a PLC signal cable, and a logic control program is written in the PLC.

[0014] Preferably, the cabinet is made of low-temperature resistant metal materials by welding, and the coolant is 3M electronic fluoride liquid.

[0015] The beneficial effects of the utility model are as follows:

[0016] The utility model can effectively reduce the loss of liquid nitrogen and the generation of condensed water along the pipeline by using a vacuum pipeline to transport liquid nitrogen. A heat exchanger is installed in the cabinet of the utility model; the cabinet adopts a welding process to ensure that the coolant contained in the cabinet does not leak. The utility model has many advantages such as simple and reasonable structure, easy installation and use, safety and high efficiency, energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall process flow of the utility model.

[0018] Figure 2 It is an illustration of the liquid nitrogen storage and supply system of the utility model.

[0019] Figure 3 It is a schematic diagram of the liquid nitrogen delivery system in the utility model.

[0020] Figure 4 It is a schematic diagram of the cooling system in the utility model.

[0021] Figure 5 It is a schematic diagram of the nitrogen exhaust system in the utility model. DETAILED DESCRIPTION

[0022] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments.

[0023] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal" and "vertical" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or component referred to must have a specific direction and therefore should not be understood as a limitation on the present invention.

[0024] The utility model will be described in detail below with reference to the accompanying drawings: Figure 1As shown, a liquid nitrogen cooled immersion server heat dissipation system includes a liquid nitrogen storage and supply system 1, a liquid nitrogen delivery system 2, a cooling system 3, a nitrogen discharge system 5 and a control system 4, which are connected to each other through pipelines. One end of the liquid nitrogen storage and supply system 1 is connected to an external tank truck unloading port, and the other end is connected to the cooling system 3 through the liquid nitrogen delivery system 2. The cooling system 3 is connected to the nitrogen discharge system 5 for nitrogen discharge, and the liquid nitrogen storage and supply system 1, the liquid nitrogen delivery system 2, the cooling system 3, and the nitrogen discharge system 5 are all controlled by the control system 4.

[0025] It is worth noting that each subsystem in the present invention allows for enlargement or reduction in scale and size to adapt to changes in demand according to changes in actual demand scenarios.

[0026] like Figure 2 As shown, the liquid nitrogen storage and supply subsystem 1 mainly includes a self-boosting device 6, a liquid nitrogen outlet 7, a liquid nitrogen inlet 8 and a vacuum liquid nitrogen storage tank 9, wherein the vacuum liquid nitrogen storage tank 9 is respectively provided with a liquid nitrogen outlet 7 and a liquid nitrogen inlet 8, the liquid nitrogen outlet 7 is connected to the liquid nitrogen delivery system, the liquid nitrogen inlet 8 is connected to the tank truck unloading port, and a self-boosting device 6 is installed in the vacuum liquid nitrogen storage tank 9, through which the liquid nitrogen flows into the liquid nitrogen delivery system. The self-boosting device is used to increase the pressure of the storage tank. Liquid nitrogen is purchased and supplied through a vacuum liquid nitrogen storage tank, which can significantly simplify the equipment on site in the data center and is conducive to long-term use and maintenance.

[0027] like Figure 3 As shown, the liquid nitrogen delivery system 2 is composed of a vacuum pipe 10 and a cryogenic valve 11. The liquid nitrogen from the vacuum liquid nitrogen storage tank 9 through the liquid nitrogen outlet 7 flows into the vacuum pipe 10. A cryogenic valve 11 is provided at the end of the vacuum pipe 10. The cryogenic valve 11 is used to cut off the connection between the liquid nitrogen delivery system 2 and the cooling system 3 during maintenance. After the liquid nitrogen flows out of the vacuum pipe 10, it flows into the cooling system 3 through the cryogenic valve 11.

[0028] The utility model can effectively reduce the loss of liquid nitrogen and the generation of condensed water along the pipeline by using a vacuum pipeline to transport liquid nitrogen.

[0029] like Figure 4 As shown, the cooling system 3 consists of a cabinet 13 and a heat exchanger 17, wherein the heat exchanger 17 is placed in the cabinet 13, and coolant 14 is poured into the cabinet 13 around the heat exchanger 17, the inlet end of the heat exchanger 17 is connected to the vacuum pipe 10, and the outlet end is connected to the nitrogen exhaust system 5, and a coolant level meter 16 and a cabinet temperature sensor 15 are also installed on the cabinet 13, and an inlet low-temperature control valve 12 and an outlet temperature sensor 18 are respectively installed on the inlet and outlet ends of the heat exchanger 17.

[0030] The temperature measured by the outlet temperature sensor enters the control system, and the control system sends a signal to control the opening of the nitrogen outlet cryogenic control valve to adjust the liquid nitrogen flow rate; the coolant level gauge is used to detect whether the coolant is leaking. Under normal circumstances, electronic components are not directly in contact with liquid nitrogen, which can ensure that the operating temperature of most commercial electronic components is not lower than the minimum allowable operating temperature; liquid nitrogen is in a boiling state when vaporized in the heat exchanger, with high heat transfer efficiency and can absorb a large amount of heat.

[0031] A heat exchanger is installed in the cabinet of the utility model; the cabinet adopts welding technology to ensure that the cooling liquid contained in the cabinet does not leak.

[0032] like Figure 5 As shown, the nitrogen exhaust system 5 consists of a pipeline with a muffler 22 and a high-altitude exhaust port 21, wherein the outlet end of the heat exchanger is connected to one end of the pipeline, and the high-altitude exhaust port 21 is installed at the outlet of the other end, and a muffler 22 is installed behind the high-altitude exhaust port. The muffler 22 reduces the pressure of nitrogen to normal pressure before discharging.

[0033] The nitrogen is sent to a special location for discharge, which is beneficial to ensure the safety of personnel in the data center; the nitrogen is depressurized by a muffler, which can effectively reduce the noise and nitrogen pollution caused by nitrogen emissions.

[0034] The control system includes a PLC, a PLC signal cable, and a logic control program written in the PLC. The control system PLC is connected to the control valve, temperature sensor, and coolant level gauge of the cooling system through the PLC signal cable; the logic control program is written in the control system PLC. The PLC program includes a PID control for controlling the opening of the nitrogen outlet cryogenic control valve using the outlet temperature sensor of the cooling system; the PLC program also includes alarming and control interlocking according to the coolant level gauge of the cooling system and the cabinet temperature sensor signal of the cooling system.

[0035] The working principle of the utility model is as follows:

[0036] like Figure 2 As shown, after the liquid nitrogen is transported from the outside by a tank truck, the unloading port of the tank truck is first connected to the liquid nitrogen inlet 8; the liquid nitrogen enters the vacuum liquid nitrogen storage tank 9 from the tank truck through the liquid nitrogen inlet 8; after the vacuum liquid nitrogen storage tank 9 has enough liquid nitrogen, the valves before and after the supercharger 6 are opened to allow the liquid nitrogen to flow through the supercharger 6 and vaporize, thereby increasing the pressure of the vacuum liquid nitrogen storage tank 9; after the pressure of the vacuum liquid nitrogen storage tank 9 is increased to the pressure required for liquid supply, which is generally between 0.4 and 1.5 MPa, the liquid nitrogen outlet 7 is opened so that the liquid nitrogen can flow out of the vacuum liquid nitrogen storage tank 9 and flow into the liquid nitrogen delivery system 2.

[0037] like Figure 3As shown, the liquid nitrogen delivery system 2 is composed of a vacuum pipe and pipe fitting 10 and a cryogenic valve 11. Liquid nitrogen from the vacuum liquid nitrogen storage tank 9 through the liquid nitrogen outlet 7 flows into the vacuum pipe and pipe fitting 10. A cryogenic valve 11 is provided at the end of the vacuum pipe and pipe fitting 10. The function of the cryogenic valve 11 is to cut off the connection between the liquid nitrogen delivery system 2 and the cooling system 3 during maintenance. After the liquid nitrogen flows out of the vacuum pipe and pipe fitting 10, it flows into the cooling system 3 through the cryogenic valve 11.

[0038] like Figure 4 As shown, the cooling system 3 is composed of a liquid nitrogen inlet cryogenic control valve 12, a cabinet 13, a coolant 14, a cabinet temperature sensor 15, a coolant level gauge 16, a heat exchanger 17, an outlet temperature sensor 18, and a nitrogen outlet cryogenic control valve 19. The liquid nitrogen inlet cryogenic control valve 12 is a low-temperature resistant pneumatic or electric valve. The cabinet 13 is made of low-temperature resistant metal materials, such as 304 stainless steel and 316 stainless steel, welded and manufactured. The coolant 14 uses 3M electronic fluoride liquid, which is poured into the cabinet 13 and covers the electronic equipment and the heat exchanger 17. The cabinet temperature sensor 15 uses a thermocouple or a thermal resistor, which is installed on the side of the cabinet 13 below the coolant level by means of a patch. The coolant level gauge 16 can be a differential pressure transmitter, a flap type, etc. The two pressure-leading pipes of the coolant level gauge 16 are connected to the gas phase space of the coolant 14 and the cabinet 13 respectively. The heat exchanger 17 is made of a material with good thermal conductivity and low temperature resistance, such as copper alloy; a typical type of heat exchanger 17 is a U-shaped tube bundle with the inlet and outlet fixed on the same side, and a bracket is used to constrain the direction of deformation of the tube bundle during thermal expansion and contraction. The outlet temperature sensor 18 uses a thermocouple or a thermal resistor, which is inserted into the pipeline to measure the temperature of the nitrogen. The nitrogen outlet low temperature control valve 19 is a low temperature resistant pneumatic or electric valve, and a positioner is used to adjust the specific opening. After the liquid nitrogen flows into the cooling system 3, it first passes through the liquid nitrogen inlet low temperature control valve 12, and then flows into the heat exchanger 17. The inside of the heat exchanger 17 is liquid nitrogen and nitrogen, and the outside of the heat exchanger 17 is coolant 14. The heat emitted by the electronic components first enters the coolant 14, causing the temperature of the coolant 14 to rise; the coolant 14 with increased temperature contacts the heat exchanger 17, and exchanges heat with the liquid nitrogen inside the heat exchanger 17 through the heat exchange surface of the heat exchanger 17; if the liquid nitrogen in the heat exchanger 17 leaks into the coolant 14, the temperature reading of the cabinet temperature sensor 15 will be significantly reduced. The liquid nitrogen inside the heat exchanger 17 absorbs heat and vaporizes into nitrogen. When the nitrogen gas flows through the outlet temperature sensor 18, the temperature of the nitrogen is measured by the outlet temperature sensor 18 and transmitted to the control system 4; the control system 4 controls the opening of the nitrogen outlet cryogenic control valve 19 according to the reading of the outlet temperature sensor 18, and then controls the flow of nitrogen and liquid nitrogen. After the nitrogen gas flows through the nitrogen outlet cryogenic control valve 19, it flows into the nitrogen exhaust system 5.

[0039] like Figure 5As shown, the nitrogen exhaust system 5 is composed of a muffler 22 and a high-altitude exhaust port 21. After the nitrogen flows into the nitrogen exhaust system 5, it flows into the muffler 22 through the connecting pipes and pipe fittings, and the nitrogen pressure is reduced to normal pressure in the muffler 22. The normal-pressure nitrogen is then released into the atmosphere through the high-altitude exhaust port 21.

[0040] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A liquid nitrogen cooled immersion server heat dissipation system, which includes a liquid nitrogen storage and supply system, a liquid nitrogen delivery system, a cooling system, a nitrogen exhaust system and a control system, which are connected to each other through pipelines, and is characterized by: One end of the liquid nitrogen storage and supply system is connected to an external tank truck unloading port, and the other end is connected to a cooling system through a liquid nitrogen delivery system. The cooling system is connected to a nitrogen discharge system for nitrogen discharge, and the liquid nitrogen storage and supply system, the liquid nitrogen delivery system, the cooling system, and the nitrogen discharge system are all controlled by a control system.

2. The liquid nitrogen cooled immersion server heat dissipation system according to claim 1, characterized in that: The liquid nitrogen storage and supply subsystem mainly includes a self-boosting device, a liquid nitrogen outlet, a liquid nitrogen inlet and a vacuum liquid nitrogen storage tank, wherein the vacuum liquid nitrogen storage tank is respectively equipped with a liquid nitrogen outlet and a liquid nitrogen inlet, the liquid nitrogen outlet is connected to the liquid nitrogen delivery system, and the liquid nitrogen inlet is connected to the unloading port of the tank truck. A self-boosting device is installed in the vacuum liquid nitrogen storage tank, and liquid nitrogen flows into the liquid nitrogen delivery system through the self-boosting device.

3. The liquid nitrogen cooled immersion server heat dissipation system according to claim 2, characterized in that: The liquid nitrogen delivery system consists of a vacuum pipeline and a cryogenic valve. The liquid nitrogen from the vacuum liquid nitrogen storage tank through the liquid nitrogen outlet flows into the vacuum pipeline. A cryogenic valve is provided at the end of the vacuum pipeline. The cryogenic valve is used to cut off the connection between the liquid nitrogen delivery system and the cooling system during maintenance. After the liquid nitrogen flows out of the vacuum pipeline, it flows into the cooling system through the cryogenic valve.

4. The liquid nitrogen cooled immersion server heat dissipation system according to claim 3, characterized in that: The cooling system consists of a cabinet and a heat exchanger, wherein the heat exchanger is placed in the cabinet, and coolant is poured into the cabinet around the heat exchanger, the inlet end of the heat exchanger is connected to a vacuum pipe, and the outlet end is connected to a nitrogen exhaust system, a coolant level meter and a cabinet temperature sensor are also installed on the cabinet, and an inlet low-temperature control valve and an outlet low-temperature control valve are respectively installed on the inlet and outlet ends of the heat exchanger.

5. The liquid nitrogen cooled immersion server heat dissipation system according to claim 4, characterized in that: The nitrogen exhaust system consists of a pipeline with a muffler and a high-altitude exhaust port, wherein the outlet end of the heat exchanger is connected to one end of the pipeline, and a high-altitude exhaust port is installed at the outlet of the other end. A muffler is installed behind the high-altitude exhaust port, and the muffler reduces the nitrogen pressure to normal pressure before discharging it.

6. The liquid nitrogen cooled immersion server heat dissipation system according to claim 4, characterized in that: The coolant level meter, cabinet temperature sensor, inlet low-temperature control valve, and outlet low-temperature control valve are all connected to a control system, which is a PLC controller. The PLC controller is connected to the coolant level meter, cabinet temperature sensor, inlet low-temperature control valve, and outlet low-temperature control valve through a PLC signal cable, and a logic control program is written in the PLC.

7. The liquid nitrogen cooled immersion server heat dissipation system according to claim 4, characterized in that: The cabinet is made of low-temperature resistant metal materials by welding, and the coolant adopts 3M electronic fluoride liquid.

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