Liquid-passing and air-stopping valve and negative pressure liquid cooling heat dissipation system

Abstract

The utility model relates to a kind of liquid passage air stop valve and negative pressure liquid cooling heat dissipation system, wherein liquid passage air stop valve includes valve body, valve body has liquid passage and the avoidance cavity being located in the upper of liquid passage and being communicated with liquid passage, the sealing surface of liquid passage is located between first liquid port and second liquid port, liquid passage air stop valve further includes buoyancy sealing element in liquid passage, buoyancy sealing element is sealed ball, buoyancy sealing element can be under the buoyancy of liquid into avoidance cavity to make the first liquid port and second liquid port of liquid passage be communicated, when first pipeline leaks, buoyancy sealing element is under the action of its gravity and pressure difference to form sealing with the sealing surface of liquid passage to make the first liquid port and second liquid port not be communicated.The utility model of liquid passage air stop valve can prevent air from entering negative pressure pipeline through breakage, reduce the power loss of heat dissipation system.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology for electronic products, and in particular to a liquid-flow stop valve and a negative pressure liquid cooling system. Background Technology

[0002] With the rapid development of AI, artificial intelligence, and high-frequency computing, the data center industry is expanding rapidly. As computer chip density continues to increase, the power density of IT equipment racks is also rising. Air cooling is no longer sufficient to handle the high heat density of these chips, necessitating liquid cooling systems. However, leaks in the positive-pressure liquid cooling systems of liquid-cooled servers can cause significant damage. Currently, liquid-cooled server rooms are becoming increasingly larger and more numerous, raising urgent safety concerns. The energy consumption of such massive server rooms is enormous. Given the growing global energy crisis, how to utilize new technologies to reduce the energy consumed by server cooling and build green, environmentally friendly, and secure server rooms has become a core issue for data center builders. Cooling and heat dissipation account for the vast majority of power consumption in data centers, excluding server power consumption. Therefore, safely reducing cooling energy consumption is a key factor in reducing PUE (Power Usage Effectiveness).

[0003] Traditional liquid cooling systems typically have a liquid pressure inside the pipes that is higher than the atmospheric pressure outside. When the pipes are corroded by the liquid or damaged unexpectedly for other reasons, the liquid inside will leak out, potentially causing a safety accident. While the negative pressure of a negative pressure liquid system can prevent liquid leakage in the initial stage, it cannot stop leakage for a long time, and outside air can enter the pipes through the damaged area, leading to a reduction in heat dissipation efficiency. Summary of the Invention

[0004] This invention provides a liquid-to-air valve that can prevent air from entering the negative pressure pipe through the damaged part, thereby reducing the power consumption of the heat dissipation system.

[0005] This utility model discloses a liquid-to-gas valve for installation in a negative pressure liquid pipeline. It includes a valve body with a liquid channel and a clearance cavity located above and communicating with the liquid channel. A first liquid port of the liquid channel is used to connect to a second pipeline, and a second liquid port of the liquid channel is used to connect to a first pipeline. The sealing surface of the liquid channel is located between the first liquid port and the second liquid port. The liquid-to-gas valve also includes a buoyancy seal located within the liquid channel. The buoyancy seal is a sealing ball. When there is no leakage in the first pipeline, the buoyancy seal can enter the clearance cavity under the buoyancy of the liquid, connecting the first and second liquid ports of the liquid channel. When a leak occurs in the first pipeline, the buoyancy seal, under the action of its gravity and pressure difference, forms a seal with the sealing surface of the liquid channel, preventing the first and second liquid ports from communicating.

[0006] Preferably, the sealing ball is a magnetic sealing ball, and the liquid-to-gas valve also includes an electromagnetic component that can attract the magnetic sealing ball into the clearance cavity when energized.

[0007] This utility model also provides a negative pressure liquid cooling heat dissipation system, including:

[0008] Coolant distribution unit;

[0009] Liquid-cooled servers;

[0010] The liquid supply pipe is connected at one end to the liquid supply port of the coolant distribution unit and at the other end to the liquid inlet of the liquid-cooled server. The top of the liquid supply pipe is provided with a gas collection chamber.

[0011] The return pipe is connected at one end to the liquid outlet of the liquid-cooled server and at the other end to the return port of the cold-cooled distribution unit. The return pipe is equipped with a first pressure sensor.

[0012] A liquid-to-air valve is provided on the liquid supply pipe and / or the liquid return pipe, and the liquid-to-air valve is the liquid-to-air valve as described above;

[0013] A negative pressure vacuum holding unit includes a vacuum liquid storage device and a vacuum pump for evacuating the vacuum liquid storage device. The vacuum liquid storage device has a vacuum holding liquid replenishment port, which is connected to the coolant distribution unit through a liquid replenishment pipe. The liquid replenishment pipe is equipped with a liquid replenishment valve that opens when the first pressure sensor reaches a set value.

[0014] An exhaust pipe is provided, with one end connected to the gas collection chamber and the other end connected to the vacuum liquid storage device. The exhaust pipe is equipped with an exhaust valve.

[0015] Preferably, the top end of the return pipe is provided with a gas collecting chamber.

[0016] Preferably, the liquid supply pipe includes a main liquid supply pipe connecting the coolant distribution unit and a branch liquid supply pipe connecting the main liquid supply pipe to each liquid-cooled server; the liquid return pipe includes a main liquid return pipe connecting the coolant distribution unit and a branch liquid return pipe connecting the main liquid return pipe to each liquid-cooled server; and the liquid flow and air stop valve is provided on the main liquid supply pipe and the main liquid return pipe or on each of the branch liquid supply pipes and each of the branch liquid return pipes.

[0017] Preferably, the vacuum liquid storage device includes an exhaust vacuum tank and a pressure-stabilizing vacuum liquid storage tank. The exhaust vacuum tank is provided with an air intake port connected to the exhaust pipe, a vacuum holding port connected to the vacuum pump, and a vent port connected to the pressure-stabilizing vacuum liquid storage tank. The pressure-stabilizing vacuum liquid storage tank is provided with a vent port and a vacuum holding liquid replenishment port. The vent port of the pressure-stabilizing vacuum liquid storage tank is connected to the vent port of the exhaust vacuum tank through a vent pipe, and the vacuum holding liquid replenishment port is connected to the liquid supply pipe through a liquid replenishment pipe.

[0018] Preferably, the exhaust vacuum tank is equipped with a second pressure sensor, and the vacuum pump is turned on when the second pressure sensor reaches a set value; and / or the pressure-stabilizing vacuum storage tank is equipped with a third pressure sensor, and the vent pipe is equipped with a pressure regulating valve that opens when the third pressure sensor reaches a set value.

[0019] Preferably, the negative pressure liquid cooling system further includes a primary liquid supply cooling device. The coolant distribution unit includes a heat exchanger, a secondary supply pipe, and a secondary return pipe. The primary liquid supply cooling device supplies primary coolant to the heat exchange chamber of the heat exchanger through the primary supply pipe and receives the primary coolant passing through the heat exchange chamber through the primary return pipe. One end of the secondary supply pipe is connected to the secondary outlet of the heat exchanger, and the other end forms the outlet of the coolant distribution unit and is connected to the supply pipe. One end of the secondary return pipe forms the return port of the coolant distribution unit and is connected to the return pipe, and the other end is connected to the secondary return port of the heat exchanger. The first pressure sensor is located on the secondary return pipe, and the replenishment pipe is connected to the secondary return pipe.

[0020] Preferably, the coolant distribution unit further includes a regulating pipe connecting the supply secondary pipe and the return secondary pipe. The regulating pipe is connected to the return secondary pipe at a position upstream of the connection between the replenishment pipe and the return secondary pipe, and the regulating pipe is equipped with a regulating valve.

[0021] Preferably, the coolant distribution unit includes a heat exchanger, a heat exchange supply pipe, and a heat exchange return pipe. One end of the heat exchange supply pipe is connected to the outlet of the heat exchanger, and the other end forms the outlet of the coolant distribution unit and is connected to the supply pipe. One end of the heat exchange return pipe forms the return port of the coolant distribution unit and is connected to the return pipe, and the other end is connected to the return port of the heat exchanger. The replenishment pipe is connected to the heat exchange return pipe. The negative pressure liquid cooling system also includes a cooling fan that provides cooling air to the heat exchanger.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. When the system is fully filled with liquid and operating normally, the buoyancy seal of this utility model enters the clearance cavity at the top of the liquid channel under the buoyancy of the coolant, leaving a channel for the coolant to flow. When a leak occurs in the pipe connected to the liquid-cooled server or in the pipe of the liquid-cooled server, the external atmospheric pressure forces air into the buoyancy seal, the liquid level in the liquid channel drops, and the buoyancy seal reaches the sealing surface of the buoyancy seal under the action of gravity. Under the action of pressure difference, the buoyancy seal presses against the sealing surface at the first liquid outlet, and external air cannot continue to enter the first pipe, which allows the negative pressure liquid cooling system to still operate normally.

[0024] 2. Compared with existing systems, the negative pressure liquid cooling system of this invention prevents coolant leakage and air ingress through a liquid-to-air valve. Furthermore, the gas within the system accumulates in the gas collection chamber, which the vacuum holding unit can directly extract, thus maintaining the negative pressure of the entire system. Simultaneously, not all the coolant in the vacuum holding unit participates in the circulation; it is replenished when the coolant in the supply and return pipes is insufficient. During replenishment, the vacuum holding unit is connected to the circulation system (supply and / or return pipes) to achieve the set vacuum pressure, thereby maintaining a negative pressure environment in the negative pressure liquid cooling system. This effectively reduces the electrical losses of the cooling system and achieves energy-saving effects. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a liquid-flow and gas-stop valve installed in a negative pressure liquid supply pipe according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of a liquid-passing and gas-stopping valve installed in a negative pressure return pipe according to an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of a negative pressure liquid cooling heat dissipation system for a single liquid cooling cabinet according to an embodiment of the present invention;

[0028] Figure 4A schematic diagram of the principle of a negative pressure liquid cooling heat dissipation system for heat dissipation of multiple liquid cooling cabinets provided in one embodiment of this utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the negative pressure vacuum holding unit of the negative pressure liquid cooling heat dissipation system according to an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of the coolant distribution unit of a negative pressure liquid cooling heat dissipation system according to an embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram of the coolant distribution unit of a negative pressure liquid cooling heat dissipation system according to another embodiment of the present invention.

[0032] Figure Labels

[0033] 1 Liquid-to-gas valve, 11 Valve body, 12 Liquid passage, 13 Clearance chamber, 14 First liquid port, 15 Second liquid port, 16 Negative pressure return pipe, 17 Negative pressure supply pipe, 18 Sealing ball, 19 Electromagnetic component;

[0034] 2 Coolant distribution unit, 21 Heat exchanger, 22 Secondary supply pipe, 23 Secondary return pipe, 231 First pressure sensor, 24 Secondary circulation pump, 25 Flexible connection, 26 Check valve, 27 Regulating pipe, 271 Regulating valve, 28 Primary supply pipe, 29 Primary return pipe, 21' Heat exchanger, 22' Heat exchange supply pipe, 23' Heat exchange return pipe;

[0035] 3. Liquid-cooled servers;

[0036] 4 Liquid supply pipe, 41 Liquid supply main pipe, 42 Liquid supply branch pipe, 43 Gas collection chamber;

[0037] 5. Return liquid pipe, 51. Main return liquid pipe, 52. Branch return liquid pipe, 53. Gas collection chamber;

[0038] 6. Negative pressure vacuum holding unit, 61. Exhaust vacuum tank, 611. Inlet, 612. Vacuum holding port, 613. Lower vent, 614. Second pressure sensor, 615. First liquid level sensor, 62. Pressure stabilizing vacuum storage tank, 621. Vacuum holding replenishment port, 622. Third pressure sensor, 623. Second liquid level sensor, 624. Upper vent, 63. Replenishment pipe, 64. Replenishment valve, 65. Vent pipe, 66. Pressure regulating valve, 67. Vacuum pump;

[0039] 7. Exhaust pipe; 71. Vacuum holding pipe; 72. Branch exhaust pipe; 73. Exhaust valve;

[0040] 8. Coolant primary supply and heat dissipation equipment; 81. Cooling tower; 82. Primary circulation pump;

[0041] 9. Cooling fans. Detailed Implementation

[0042] This utility model provides a liquid-flow-stop valve 1 for installation in a negative pressure liquid pipeline, the first embodiment of which is as follows: Figure 1 and Figure 2 As shown, in this embodiment, the liquid-to-gas valve 1 includes a valve body 11, which has a liquid channel 12 and a clearance cavity 13 located above and communicating with the liquid channel 12. The second liquid port 15 of the liquid channel 12 is used to connect with a first pipe (not shown in the figure; in this embodiment, the first pipe is a pipe connected to the liquid-cooled server 3, or a pipe inside the liquid-cooled server). The first liquid port 14 of the liquid channel 12 is used to connect with a second pipe, i.e. Figure 1 and Figure 2 The negative pressure return pipe 16 and negative pressure supply pipe 17 are connected. The normal flow direction of the coolant is from the first liquid port 14 to the second liquid port 15. The liquid-flow check valve 1 also includes a sealing ball 18 located in the liquid channel 12. The size of the sealing ball 18 is larger than the size of the first liquid port and the second liquid port. When there is no leakage in the first pipe, the sealing ball 18 can enter the clearance cavity 13 under the action of liquid buoyancy, so that the first liquid port 14 and the second liquid port 15 of the liquid channel 12 are connected. When the first pipe leaks, the sealing ball 18 forms a seal with the sealing surface of the liquid channel 12 (not shown in the figure) under the action of its own weight and external atmospheric pressure, so that the first liquid port 14 and the second liquid port 15 are not connected.

[0043] When the system is fully filled with liquid and operating normally, the sealing ball 18 enters the ball storage chamber 13 at the top of the liquid channel 12 under the buoyancy of the coolant, leaving a channel for the coolant to flow. When the first pipe (the pipe connected to the liquid-cooled server 3) or the liquid-cooled server 3 leaks, the liquid and air are forced into the liquid-to-air valve 1 by the outside atmosphere, the liquid level in the liquid channel 12 drops, and the sealing ball 18 reaches the sealing surface inside the liquid channel 12 under the action of gravity. Under the action of pressure difference, the sealing ball 18 presses the sealing surface tightly, and the outside air cannot enter the second pipe. This allows the undamaged parts of the negative pressure liquid cooling heat dissipation system to operate normally.

[0044] like Figure 1 and Figure 2 As shown, the second liquid port 15 of the liquid channel 12 is higher than the first liquid port 14. Therefore, when the liquid level in the liquid channel 12 drops, not only the pressure difference but also the gravity of the sealing ball 18 itself causes it to press against the sealing surface at the first liquid port 14. Figure 1 and 2As shown, the liquid-flow check valve 1 also includes an electromagnetic component 19 located at the upper end of the valve body 11. In this embodiment, the electromagnetic component 19 is fixed to the top of the outer wall of the valve body 11 and faces the ball storage chamber 13. In this embodiment, the sealing ball 18 includes a stainless steel shell and a magnetic attraction component located inside the shell. The magnetic attraction component can be an iron ball or other magnetically attractable components. When the electromagnetic component 19 is energized, the magnetic attraction component generates an attraction force that can attract the sealing ball 18 into the ball storage chamber 13. In this embodiment, the electromagnetic component 19 is a magnetic coil. During the initial water filling stage, the magnetic coil at the top of the valve body 11 is energized, and the electromagnetic component 19 attracts the sealing ball 18 into the top ball storage chamber 13, thereby opening the liquid-flow check valve 1 and filling the entire negative pressure liquid cooling system pipeline with coolant.

[0045] This utility model also provides a negative pressure liquid cooling heat dissipation system, such as Figure 3 and Figure 4 As shown, the negative pressure liquid cooling system includes a coolant distribution unit 2, a liquid-cooled server 3, a supply pipe 4, a return pipe 5, a liquid-flow check valve 1, a negative pressure vacuum holding unit 6, and an exhaust pipe 7. One end of the supply pipe 4 is connected to the supply port of the coolant distribution unit 2, and the other end is connected to the inlet of the liquid-cooled server 3. The top of the supply pipe 4 has a gas collection chamber 43, which is higher than all the liquid-cooled servers 3, and the gas in the supply pipe 4 automatically collects in the gas collection chamber 43. One end of the return pipe 5 is connected to the outlet of the liquid-cooled server 3, and the other end is connected to the return port of the coolant distribution unit 2. The coolant distribution unit 2 is equipped with a first pressure sensor 231 (see...). Figure 6 Both the supply pipe 4 and the return pipe 5 are equipped with a liquid-flow check valve 1. The liquid-flow check valve 1 adopts the structure described above. When the liquid-cooled server 3 leaks, the liquid-flow check valve 1 closes to prevent gas from entering. The negative pressure vacuum holding unit 6 includes a vacuum liquid storage device and a vacuum pump 67 for evacuating the vacuum liquid storage device. The vacuum liquid storage device has a vacuum holding liquid replenishment port 621 and is connected to the coolant distribution unit 2 through a liquid replenishment pipe 63. The liquid replenishment pipe 63 is equipped with a liquid replenishment valve 64 that opens when the first pressure sensor 231 reaches a set value. When the first pressure sensor 231 is lower than the set minimum value, the vacuum liquid storage device replenishes liquid to the coolant distribution unit 2. When the first pressure sensor 231 is higher than the set maximum value, the coolant distribution unit 2 replenishes liquid to the vacuum liquid storage device. One end of the exhaust pipe 7 is connected to the gas collection chamber 43, and the other end is connected to the vacuum liquid storage device. The exhaust pipe 7 is provided with an exhaust valve 73 near the gas collection chamber 43. The exhaust valve 73 allows gas to pass through but does not allow liquid to pass through. Its structure is existing.

[0046] Compared with existing systems, the negative pressure liquid cooling system of this invention prevents coolant leakage and air ingress through the liquid-to-air valve 1. Furthermore, the gas within the system accumulates in the gas collection chamber 43, which the vacuum holding unit can directly extract, thus maintaining the negative pressure of the entire system. Simultaneously, not all the coolant in the vacuum holding unit participates in the circulation; it is replenished when the coolant in the supply pipe 4 and return pipe 5 is insufficient. During replenishment, the vacuum holding unit is connected to the circulation system (supply pipe 4 and / or return pipe 5) to reach the set vacuum pressure, thereby maintaining the negative pressure environment of the negative pressure liquid cooling system. The inlet and outlet of the coolant distribution unit 2 are both under negative pressure, effectively reducing the electrical losses of the cooling system and achieving energy-saving effects.

[0047] exist Figure 3 and Figure 4 In this configuration, the top end of the return pipe 5 is also provided with a gas collecting chamber 53. The exhaust pipe 7 includes a vacuum holding pipe 71 connected to the negative pressure vacuum holding unit 6 and multiple branch exhaust pipes 72. One end of each branch exhaust pipe 72 is connected to the vacuum holding pipe 71, and the other end is connected to the return pipe 5 or the supply pipe 4. An exhaust valve 73 is provided on the branch exhaust pipe 72. The gas in the supply pipe 4 and the return pipe 5 is drawn away by the negative pressure vacuum holding unit 6 through the branch exhaust pipes 72, which can stably maintain the negative pressure in the supply pipe 4 and the return pipe 5.

[0048] like Figure 3 and Figure 4 As shown, the liquid supply pipe 4 includes a main liquid supply pipe 41 connecting to the coolant distribution unit 2 and a branch liquid supply pipe 42 connecting the main liquid supply pipe 41 to each liquid-cooled server 3. The return pipe 5 includes a main return pipe 51 connecting to the coolant distribution unit 2 and a branch return pipe connecting the main return pipe 51 to each liquid-cooled server 3. Figure 3 As shown, the coolant distribution unit 2 can be designed as a rack-mount unit, deployed within the liquid-cooled server 3 rack, to provide heat dissipation for a single liquid-cooled server 3 rack. In this case, the liquid flow check valve 1 is located on each of the supply branch pipes 42 and each of the return branch pipes. The coolant distribution unit 2 can also be designed as a rack-mount unit, such as... Figure 4 As shown, it is deployed in the row of liquid-cooled server 3 racks or in the equipment room to provide heat dissipation for multiple liquid-cooled server 3 racks. The liquid supply and gas stop valve 1 is located in each liquid supply main pipe 41 and liquid return main pipe 51.

[0049] like Figure 5As shown, the vacuum liquid storage device includes an exhaust vacuum tank 61 and a pressure-stabilizing vacuum liquid storage tank 62. The pressure inside the exhaust vacuum tank 61 is lower than the pressure inside the gas collecting chambers 43 and 53, and air from the gas collecting chambers 43 and 53 enters the exhaust vacuum tank 61 under negative pressure. Simultaneously, the pressure inside the exhaust vacuum tank 61 is lower than the pressure inside the pressure-stabilizing vacuum liquid storage tank 62, and air from the pressure-stabilizing vacuum liquid storage tank 62 enters the exhaust vacuum tank 61 under negative pressure. The exhaust vacuum tank 61 is also equipped with a first liquid level sensor 615.

[0050] The exhaust vacuum tank 61 is provided with an air intake 611 connected to the exhaust pipe 7, a vacuum holding port 612 connected to the vacuum pump 67, and a lower vent 613 connected to the pressure-stabilizing vacuum liquid storage tank 62. The pressure-stabilizing vacuum liquid storage tank 62 is provided with an upper vent 624 and a vacuum holding liquid replenishment port 621. The upper vent 624 of the pressure-stabilizing vacuum liquid storage tank 62 is connected to the lower vent 613 of the exhaust vacuum tank 61 via a vent pipe 65. The vacuum holding liquid replenishment port 621 is connected to the coolant distribution unit 2 via a replenishment pipe 63. The pressure-stabilizing vacuum liquid storage tank 62 is provided with a third pressure sensor 622, and the vent pipe 65 is provided with a pressure regulating valve 66 that opens when the third pressure sensor 622 reaches a set value.

[0051] After the pressure regulating valve 66 opens, the pressure inside the exhaust vacuum tank 61 rises. The exhaust vacuum tank 61 is equipped with a second pressure sensor 614, and the vacuum pump 67 starts when the second pressure sensor 614 reaches a set value. Through this structure, the pressure of the pressure-stabilizing vacuum storage tank 62 and the exhaust vacuum tank 61 is maintained within a set range, thereby maintaining the normal circulation of the entire negative pressure liquid cooling system. The pressure-stabilizing vacuum storage tank 62 is also equipped with a second liquid level sensor 623.

[0052] like Figure 6 As shown, the negative pressure liquid cooling system also includes a primary coolant supply device 8, which includes a cooling tower 81, a dry cooler, or a refrigeration unit, and a primary circulation pump 82. The primary coolant supply device 8 cools the primary coolant and supplies it to the primary inlet of the heat exchanger 21, and receives the primary coolant returned from the primary return port of the coolant distribution unit 2.

[0053] The coolant distribution unit 2 includes a heat exchanger 21, a secondary supply pipe 22, and a secondary return pipe 23. The heat exchanger 21 can be an existing plate heat exchanger 21; in this embodiment, it is a plate-fin heat exchanger 21. The heat exchanger 21 has heat exchange tubes. Coolant from the return pipe 5 flows into the heat exchange tubes (not shown in the figure) of the heat exchanger 21. The primary supply cooling device supplies primary coolant to the heat exchange chamber (not shown in the figure) of the heat exchanger 21 through the primary supply pipe 428. The low-temperature coolant in the heat exchange chamber cools the coolant in the heat exchange tubes. The primary flow cooling device receives the primary coolant passing through the heat exchange chamber through the primary return pipe 529. One end of the secondary supply pipe 22 is connected to the secondary outlet of the heat exchanger 21, and the other end forms the outlet of the coolant distribution unit 2, which is connected to the supply pipe 4. One end of the secondary return pipe 23 forms the return port of the coolant distribution unit 2 and connects to the return pipe 5, while the other end connects to the secondary return port of the heat exchanger 21. A secondary circulation pump 24 is installed on the secondary return pipe 23. In this embodiment, flexible connections 25 are provided upstream and downstream of the secondary circulation pump 24 on the secondary return pipe 23 to prevent vibration of the secondary circulation pump 24 from being transmitted to other parts of the secondary return pipe 23. A check valve 26 is also provided downstream of the secondary circulation pump 24 on the secondary return pipe 23, ensuring that the coolant in the return pipe 5 can only flow unidirectionally towards the heat exchanger 21. The makeup pipe 63 is connected to the secondary return pipe 23, and the connection point between the makeup pipe 63 and the secondary return pipe 23 is upstream of the secondary circulation pump 24. Figure 6 In the illustrated embodiment, the coolant distribution unit 2 further includes a regulating pipe 27 connecting the supply secondary pipe 22 and the return secondary pipe 23. The regulating pipe 27 is connected to the return secondary pipe 23 upstream of the connection between the replenishment pipe 63 and the return secondary pipe 23. The regulating pipe 27 is equipped with a regulating valve 271. This structure allows for adjustment of the flow rate supplied by the coolant distribution unit 2 to the supply pipe 4. A high-precision filter is also provided downstream of the connection between the replenishment pipe 63 and the supply secondary pipe 22 on the supply secondary pipe 22 to filter the coolant.

[0054] like Figure 7 As shown, the negative pressure liquid cooling system also includes a cooling fan 9 that provides cooling air to the heat exchanger 21. The coolant distribution unit 2 includes a heat exchanger 21', a heat exchange supply pipe 22', and a heat exchange return pipe 23'. One end of the heat exchange supply pipe 22' is connected to the outlet of the heat exchanger 21', and the other end forms the outlet of the coolant distribution unit 2 and is connected to the supply pipe 4. One end of the heat exchange return pipe 23' forms the return port of the coolant distribution unit 2 and is connected to the return pipe 5, and the other end is connected to the return port of the heat exchanger 21. The replenishment pipe 63 is connected to the heat exchange return pipe 23'.

[0055] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Various modifications or equivalent substitutions made by those skilled in the art to this invention within the spirit and scope of protection of this invention also fall within the scope of protection of this invention.

Claims

1. A liquid-flow check valve, characterized in that, For installation on negative pressure liquid pipelines, the valve includes a valve body having a liquid channel and a clearance cavity located above and communicating with the liquid channel. A first liquid port of the liquid channel is used to connect to a second pipeline, and a second liquid port of the liquid channel is used to connect to a first pipeline. The sealing surface of the liquid channel is located between the first liquid port and the second liquid port. The liquid-to-gas valve also includes a buoyancy seal located within the liquid channel. The buoyancy seal is a sealing ball. When there is no leakage in the first pipeline, the buoyancy seal can enter the clearance cavity under the buoyancy of the liquid, making the first liquid port and the second liquid port of the liquid channel communicate. When the first pipeline leaks, the buoyancy seal forms a seal with the sealing surface of the liquid channel under the action of its gravity and pressure difference, so that the first liquid port and the second liquid port are not connected.

2. The liquid-to-gas valve according to claim 1, characterized in that, The sealing ball is a magnetic sealing ball, and the liquid-to-gas valve also includes an electromagnetic component that can attract the magnetic sealing ball into the clearance cavity when energized.

3. A negative pressure liquid cooling heat dissipation system, characterized in that, include: Coolant distribution unit; Liquid-cooled servers; The liquid supply pipe is connected at one end to the liquid supply port of the coolant distribution unit and at the other end to the liquid inlet of the liquid-cooled server. The top of the liquid supply pipe is provided with a gas collection chamber. The return pipe is connected at one end to the outlet of the liquid-cooled server and at the other end to the return port of the coolant distribution unit. The return pipe is equipped with a first pressure sensor. A liquid-flow check valve is provided on the liquid supply pipe and / or the liquid return pipe, wherein the liquid-flow check valve is the liquid-flow check valve as described in claim 1 or 2; A negative pressure vacuum holding unit includes a vacuum liquid storage device and a vacuum pump for evacuating the vacuum liquid storage device. The vacuum liquid storage device has a vacuum holding liquid replenishment port, which is connected to the coolant distribution unit through a liquid replenishment pipe. The liquid replenishment pipe is equipped with a liquid replenishment valve that opens when the first pressure sensor reaches a set value. An exhaust pipe is provided, with one end connected to the gas collection chamber and the other end connected to the vacuum liquid storage device. The exhaust pipe is equipped with an exhaust valve.

4. The negative pressure liquid cooling heat dissipation system according to claim 3, characterized in that, The top of the return pipe is provided with a gas collection chamber.

5. The negative pressure liquid cooling heat dissipation system according to claim 3, characterized in that, The liquid supply pipe includes a main liquid supply pipe connecting the coolant distribution unit and a branch liquid supply pipe connecting the main liquid supply pipe to each liquid cooling server. The return liquid pipe includes a main return liquid pipe connecting the coolant distribution unit and a branch return liquid pipe connecting the main return liquid pipe to each liquid cooling server. The liquid flow and air stop valve is located on the main liquid supply pipe and the main return liquid pipe or on each of the main liquid supply pipes and each of the branch return liquid pipes.

6. The negative pressure liquid cooling heat dissipation system according to claim 3, characterized in that, The vacuum liquid storage device includes an exhaust vacuum tank and a pressure-stabilizing vacuum liquid storage tank. The exhaust vacuum tank is provided with an air intake port connected to the exhaust pipe, a vacuum holding port connected to the vacuum pump, and a vent port connected to the pressure-stabilizing vacuum liquid storage tank. The pressure-stabilizing vacuum liquid storage tank is provided with a vent port and a vacuum holding liquid replenishment port. The vent port of the pressure-stabilizing vacuum liquid storage tank is connected to the vent port of the exhaust vacuum tank through a vent pipe, and the vacuum holding liquid replenishment port is connected to the liquid supply pipe through a liquid replenishment pipe.

7. The negative pressure liquid cooling heat dissipation system according to claim 6, characterized in that, The exhaust vacuum tank is equipped with a second pressure sensor, and the vacuum pump is turned on when the second pressure sensor reaches a set value; and / or the pressure-stabilizing vacuum storage tank is equipped with a third pressure sensor, and the vent pipe is equipped with a pressure regulating valve that opens when the third pressure sensor reaches a set value.

8. The negative pressure liquid cooling heat dissipation system according to claim 3, characterized in that, The negative pressure liquid cooling system also includes a primary liquid supply cooling device. The coolant distribution unit includes a heat exchanger, a secondary supply pipe, and a secondary return pipe. The primary liquid supply cooling device supplies primary coolant to the heat exchange chamber of the heat exchanger through the primary supply pipe and receives the primary coolant passing through the heat exchange chamber through the primary return pipe. One end of the secondary supply pipe is connected to the secondary outlet of the heat exchanger, and the other end forms the outlet of the coolant distribution unit and is connected to the supply pipe. One end of the secondary return pipe forms the return port of the coolant distribution unit and is connected to the return pipe, and the other end is connected to the secondary return port of the heat exchanger. The first pressure sensor is located on the secondary return pipe, and the replenishment pipe is connected to the secondary return pipe.

9. The negative pressure liquid cooling heat dissipation system according to claim 8, characterized in that, The coolant distribution unit also includes a regulating pipe connecting the supply secondary pipe and the return secondary pipe. The regulating pipe is connected to the return secondary pipe at a position upstream of the position where the replenishment pipe is connected to the return secondary pipe, and the regulating pipe is equipped with a regulating valve.

10. The negative pressure liquid cooling heat dissipation system according to claim 3, characterized in that, The coolant distribution unit includes a heat exchanger, a heat exchange supply pipe, and a heat exchange return pipe. One end of the heat exchange supply pipe is connected to the outlet of the heat exchanger, and the other end forms the outlet of the coolant distribution unit and is connected to the supply pipe. One end of the heat exchange return pipe forms the return port of the coolant distribution unit and is connected to the return pipe, and the other end is connected to the return port of the heat exchanger. The replenishment pipe is connected to the heat exchange return pipe. The negative pressure liquid cooling system also includes a cooling fan that provides cooling air to the heat exchanger.

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