A self-circulating liquid cooling system and control method

Abstract

The present invention discloses a self-circulating liquid cooling system and a control method, which are used to solve the technical problem that the existing liquid cooling system needs to use a circulating pump to realize the circulation of coolant. The equipment cooling pipeline in the present invention is connected with a second coolant supply pipeline, the second coolant supply pipeline is connected to the second circuit of the main heat exchanger, the second circuit of the main heat exchanger is connected to a liquid storage tank, the bottom outlet of the liquid storage tank is connected with a second coolant outlet pipeline, the second coolant outlet pipeline is connected to the equipment cooling pipeline; the first vacuum generation pipeline is connected to the gaseous second coolant outlet of the main heat exchanger, the first vacuum generation pipeline is connected to the inlet of the second circuit of the auxiliary heat exchanger, the first pressure sensor and the vacuum pump are connected to the first vacuum generation pipeline, the gaseous second coolant outlet of the auxiliary heat exchanger is connected to the second vacuum generation pipeline, the second vacuum generation pipeline is connected to the second coolant supply pipeline, and the auxiliary heat exchanger is connected to the liquid storage tank.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid cooling system design, and in particular to a self-circulating liquid cooling system and a control method thereof. Background Art

[0002] Currently, air cooling is commonly used in data centers. However, for application scenarios with increasingly higher heat flux density, air cooling can no longer meet the actual application requirements, and liquid cooling must be used.

[0003] The liquid cooling system usually includes equipment cooling pipelines, heat exchangers, pipelines, circulating pumps, and various sensors. Among them, the equipment cooling pipeline is used to absorb the heat of the equipment (such as a server), and the fluid in the equipment cooling pipeline is transferred to the heat exchanger through the pipeline, vacuum pump, and circulating pump. The heat exchanger can transfer the heat of the hot fluid to another cold fluid, thereby achieving a cooling effect; the vacuum pump ensures that the air pressure in the pipeline is lower than the external atmospheric pressure, so that the fluid flowing in the pipeline does not leak; the circulating pump in the liquid cooling system is used to adjust the flow rate of the coolant in the pipeline, thereby adjusting the heat exchange rate of the coolant. It can be seen that in the existing liquid cooling system, the coolant in the pipeline needs a circulating pump to provide it with flow power so that it can circulate in the pipeline. Due to the existence of the circulating pump, the system needs to provide corresponding power components to supply the circulating pump to make it operate, resulting in technical problems such as complicated system structure.

[0004] Therefore, in order to solve the above technical problems, finding a self-circulating liquid cooling system and a control method has become an important topic studied by technical personnel in this field. Summary of the invention

[0005] The embodiment of the invention discloses a self-circulating liquid cooling system and a control method, which are used to solve the technical problem that the existing liquid cooling system needs a circulating pump to realize the circulation of cooling liquid.

[0006] The embodiment of the present invention provides a self-circulating liquid cooling system, including a main heat exchanger, an auxiliary heat exchanger, an equipment cooling pipeline, a liquid storage tank, and a vacuum generating circuit;

[0007] The main heat exchanger and the auxiliary heat exchanger both include a first circuit and a second circuit that are isolated from each other, and the first coolant in the first circuit is used to cool the second coolant in the second circuit; the top of the main heat exchanger and the top of the auxiliary heat exchanger are both provided with a gaseous second coolant outlet;

[0008] The outlet of the equipment cooling pipeline is connected to a second coolant supply pipeline, the outlet of the second coolant supply pipeline is connected to the inlet of the second circuit of the main heat exchanger, the outlet of the second circuit of the main heat exchanger is connected to the liquid storage tank, the liquid storage tank is located below the main heat exchanger, the bottom outlet of the liquid storage tank is connected to a second coolant outlet pipeline, the outlet of the second coolant outlet pipeline is connected to the inlet of the equipment cooling pipeline;

[0009] The auxiliary heat exchanger is located above the main heat exchanger, and the vacuum generating circuit includes a first vacuum generating pipeline, a second vacuum generating pipeline, a vacuum pump, and a first pressure sensor for detecting the inlet pressure of the vacuum pump;

[0010] The first port of the first vacuum generating pipeline is connected to the gaseous second coolant outlet of the main heat exchanger, the second port of the first vacuum generating pipeline is connected to the inlet of the second circuit of the auxiliary heat exchanger, the first pressure sensor and the vacuum pump are connected to the first vacuum generating pipeline, the gaseous second coolant outlet of the auxiliary heat exchanger is connected to the first port of the second vacuum generating pipeline, the second port of the second vacuum generating pipeline is connected to the second coolant supply pipeline, and the outlet of the second circuit of the auxiliary heat exchanger is connected to the liquid storage tank.

[0011] Optionally, the second coolant supply pipeline is also connected to a second pressure sensor and a first temperature sensor;

[0012] The second pressure sensor is used to detect the pressure of the second coolant, and the first temperature sensor is used to detect the temperature of the second coolant;

[0013] The second vacuum generating pipeline is connected to an exhaust pipeline, a first solenoid valve is arranged on the exhaust pipeline, the second vacuum generating pipeline is connected to a second solenoid valve, and the second solenoid valve is located between the exhaust pipeline and the second coolant supply pipeline.

[0014] Optionally, a second temperature sensor for detecting the temperature of the second coolant is also connected to the second coolant outlet pipeline.

[0015] Optionally, it includes a liquid storage tower, a first coolant supply pipeline, a first liquid supply pipeline, a first liquid outlet pipeline, a second liquid supply pipeline and a second liquid outlet pipeline;

[0016] The inlet of the first coolant supply pipeline is connected to the outlet of the liquid storage tower, and the inlet of the first liquid outlet pipeline and the inlet of the second liquid outlet pipeline are both connected to the outlet of the first coolant supply pipeline;

[0017] The outlet of the first liquid supply pipeline is connected to the inlet of the first circuit of the main heat exchanger, and the outlet of the first circuit of the main heat exchanger is connected to the inlet of the first liquid outlet pipeline, and the outlet of the first liquid outlet pipeline is connected to the inlet of the liquid storage tower;

[0018] The outlet of the second liquid supply pipeline is connected to the inlet of the first circuit of the auxiliary heat exchanger, and the outlet of the first circuit of the auxiliary heat exchanger is connected to the inlet of the second liquid outlet pipeline, and the outlet of the second liquid outlet pipeline is connected to the inlet of the liquid storage tower;

[0019] The first coolant supply pipeline is connected with a first control valve and a third temperature sensor for detecting the temperature of the first coolant;

[0020] The second liquid supply pipeline is connected with a second control valve;

[0021] The first liquid outlet pipeline is connected to a fourth temperature sensor for detecting the temperature of the first coolant flowing out of the main heat exchanger, and the second liquid outlet pipeline is connected to a fifth temperature sensor for detecting the temperature of the first coolant flowing out of the auxiliary heat exchanger.

[0022] Optionally, it further includes a third solenoid valve and a one-way valve;

[0023] The outlet of the second circuit of the auxiliary heat exchanger is connected to the liquid storage tank through the third solenoid valve;

[0024] A low water level switch and a high water level switch are provided inside the auxiliary heat exchanger, and the high water level switch is located above the low water level switch;

[0025] The outlet of the second circuit of the main heat exchanger is connected to the liquid storage tank through the one-way valve.

[0026] An embodiment of the present invention provides a self-circulating liquid cooling system control method, the control method is used to control the above-mentioned self-circulating liquid cooling system, the control method includes:

[0027] When it is detected that the detection value of the first pressure sensor is greater than the first pressure setting value, the vacuum pump is turned on;

[0028] When it is detected that the detection value of the first pressure sensor is less than the second pressure setting value, the vacuum pump is turned off.

[0029] Optionally, it also includes:

[0030] The control target of the vacuum pump is the vacuum pump inlet pressure, and the boiling point of the second coolant in the main heat exchanger is calculated in real time according to the pressure value of the main heat exchanger detected by the second pressure sensor;

[0031] When the difference between the boiling point and the detection value of the first temperature sensor is less than the first temperature setting value, the control target value of the vacuum pump is increased until the difference between the boiling point and the detection value of the first temperature sensor is greater than the first temperature setting value.

[0032] Optionally, it also includes:

[0033] When it is detected that the detection value of the second pressure sensor is greater than the third pressure setting value, the second solenoid valve is closed and the first solenoid valve is opened;

[0034] When it is detected that the detection value of the second pressure sensor is less than the fourth pressure setting value, the first solenoid valve is closed and the second solenoid valve is opened.

[0035] Optionally, it also includes:

[0036] The first control valve is used to control the supply flow of the first coolant supply pipeline, and then the temperature of the second coolant in the second coolant outlet pipeline is controlled. The specific control process is:

[0037] When it is detected that the detection value of the second temperature sensor is greater than the third temperature setting value, the opening of the first control valve is increased;

[0038] When it is detected that the detection value of the second temperature sensor is less than the second temperature setting value, the opening of the first control valve is reduced;

[0039] Alternatively, the dew point temperature is calculated in real time through the detection values ​​of the temperature and humidity sensor;

[0040] When the detection value of the second temperature sensor is detected to be greater than (dew point temperature + safety value + hysteresis), the opening of the first control valve is increased;

[0041] When it is detected that the detection value of the second temperature sensor is less than (dew point temperature+safety value-hysteresis), the opening of the first control valve is reduced.

[0042] Optionally, it also includes:

[0043] The flow rate of the first coolant in the second liquid supply pipeline is controlled by controlling the opening of the second control valve, so that the outflow temperature of the first coolant in the auxiliary heat exchanger is equal to the outflow temperature of the first coolant in the main heat exchanger. The specific control process is:

[0044] When the detected value of the fifth temperature sensor is greater than (the detected value of the fourth temperature sensor + the hysteresis), the opening of the second control valve is increased;

[0045] When the detected value of the fifth temperature sensor is less than (the detected value of the fourth temperature sensor-the hysteresis), the opening degree of the second control valve is reduced.

[0046] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

[0047] In this embodiment, the outlet of the equipment cooling pipeline is connected to the second coolant supply pipeline, the outlet of the second coolant supply pipeline is connected to the inlet of the second circuit of the main heat exchanger, the outlet of the second circuit of the main heat exchanger is connected to the liquid storage tank, the bottom outlet of the liquid storage tank is connected to the second coolant outlet pipeline, the outlet of the second coolant outlet pipeline is connected to the inlet of the equipment cooling pipeline, the outlet of the second circuit of the auxiliary heat exchanger is connected to the liquid storage tank, and the main heat exchanger is arranged above the liquid storage tank, and the auxiliary heat exchanger is arranged above the main heat exchanger, so that the second coolant can rely on gravity from the outlet of the second circuit of the main heat exchanger The outlet of the second circuit of the auxiliary heat exchanger flows into the liquid storage tank, and the main heat exchanger, the auxiliary heat exchanger and the second coolant supply pipeline are connected in series through the vacuum generating circuit, so that the internal air pressure of the first vacuum generating pipeline and the second vacuum generating pipeline is lower than the external ambient atmospheric pressure. The absolute pressure of the atmospheric pressure is 1 bar. When the vacuum pump maintains the pressure range in the main heat exchanger at 0.3-0.4 bar, the gravity and pressure difference circulation are utilized to reduce the circulation pump that provides circulation power for the second coolant to flow from the second coolant supply pipeline to the second coolant outlet pipeline, thereby achieving the technical effect of self-circulation of the second coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0049] Figure 1 A schematic diagram of the structure of a self-circulating liquid cooling system provided in an embodiment of the present invention;

[0050] Figure 2 It is a structural schematic diagram of an auxiliary heat exchanger in a self-circulating liquid cooling system provided in an embodiment of the present invention;

[0051] Illustration: equipment cooling pipeline 1; second coolant supply pipeline 2; main heat exchanger 3; liquid storage tank 4; second coolant outlet pipeline 5; auxiliary heat exchanger 6; high water level switch 601; low water level switch 602; first vacuum generating pipeline 7; vacuum pump 8; first pressure sensor 9; second vacuum generating pipeline 10; first solenoid valve 11; second solenoid valve 12; second temperature sensor 13; liquid storage tower 14; first coolant supply pipeline 15; first liquid supply pipeline 16; first liquid outlet pipeline 17; second liquid supply pipeline 18; second liquid outlet pipeline 19; first control valve 20; third temperature sensor 21; fifth temperature sensor 22; fourth temperature sensor 23; one-way valve 24; third solenoid valve 25; exhaust pipeline 26; first temperature sensor 27; second pressure sensor 28; second control valve 29. DETAILED DESCRIPTION

[0052] The embodiment of the invention discloses a self-circulating liquid cooling system and a control method, which are used to solve the technical problem that the existing liquid cooling system needs a circulating pump to realize the circulation of cooling liquid.

[0053] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0054] Embodiment 1

[0055] See also Figure 1 to Figure 2 , a self-circulating liquid cooling system provided in this embodiment includes:

[0056] Main heat exchanger 3, auxiliary heat exchanger 6, equipment cooling pipeline 1, liquid storage tank 4 and vacuum generating circuit;

[0057] The main heat exchanger 3 and the auxiliary heat exchanger 6 both include a first circuit and a second circuit that are isolated from each other, and the first coolant in the first circuit is used to cool the second coolant in the second circuit; the top of the main heat exchanger 3 and the top of the auxiliary heat exchanger 6 are both provided with a gaseous second coolant outlet;

[0058] The outlet of the equipment cooling pipeline 1 is connected to a second coolant supply pipeline 2, the outlet of the second coolant supply pipeline 2 is connected to the inlet of the second circuit of the main heat exchanger 3, the outlet of the second circuit of the main heat exchanger 3 is connected to the liquid storage tank 4, the liquid storage tank 4 is located below the main heat exchanger 3, the bottom outlet of the liquid storage tank 4 is connected to a second coolant outlet pipeline 5, the outlet of the second coolant outlet pipeline 5 is connected to the inlet of the equipment cooling pipeline 1;

[0059] The auxiliary heat exchanger 6 is located above the main heat exchanger 3, and the vacuum generating circuit includes a first vacuum generating pipeline 7, a second vacuum generating pipeline 10, a vacuum pump 8, and a first pressure sensor 9 for detecting the inlet pressure of the vacuum pump 8;

[0060] The first port of the first vacuum generating pipeline 7 is connected to the gaseous second coolant outlet of the main heat exchanger 3, the second port of the first vacuum generating pipeline 7 is connected to the inlet of the second circuit of the auxiliary heat exchanger 6, the first pressure sensor 9 and the vacuum pump 8 are connected to the first vacuum generating pipeline 7, the gaseous second coolant outlet of the auxiliary heat exchanger 6 is connected to the first port of the second vacuum generating pipeline 10, the second port of the second vacuum generating pipeline 10 is connected to the second coolant supply pipeline 2, and the outlet of the second circuit of the auxiliary heat exchanger 6 is connected to the liquid storage tank 4.

[0061] Specifically, in terms of space, the auxiliary heat exchanger 6 and the main heat exchanger 3 are located higher than the water tank, so that the second coolant can flow from the main heat exchanger 3 and the auxiliary heat exchanger 6 into the liquid storage tank 4 by gravity, and the size of the height difference depends on the resistance of the equipment cooling pipeline 1. The greater the resistance, the greater the height difference required.

[0062] It should be noted that the basic working principle of the self-circulating liquid cooling system in this example is:

[0063] When the system is started, the first coolant is injected into the first circuit of the main heat exchanger 3 and the first circuit of the auxiliary heat exchanger 6. The high-temperature second coolant from the equipment enters the second circuit of the main heat exchanger 3 through the second coolant supply pipeline 2, and is converted into a low-temperature second coolant after heat exchange in the main heat exchanger 3, and enters the liquid storage tank 4 by gravity. Part of the second coolant passes through the gaseous second coolant outlet of the main heat exchanger 3 and the first vacuum generating pipeline 7 into the auxiliary heat exchanger 6 to continue to be cooled into a low-temperature working fluid, and also flows into the liquid storage tank 4 by gravity. Then, the second coolant in the liquid storage tank 4 enters the equipment cooling pipeline 1 again through the second coolant outlet pipeline 5. At the same time, the vacuum pump 8 in the vacuum generating circuit is started to maintain the first vacuum generating pipeline 7, the second vacuum generating pipeline 10, the second coolant supply pipeline 2 and the second coolant outlet pipeline 5 in a negative pressure state, and the gaseous second coolant in the system is sucked back to the main heat exchanger 3 and the auxiliary heat exchanger 6 for condensation, ensuring that even if a leak occurs, the second coolant will not leak out into the server.

[0064] In this embodiment, the outlet of the equipment cooling pipeline 1 is connected to the second coolant supply pipeline 2, the outlet of the second coolant supply pipeline 2 is connected to the inlet of the second circuit of the main heat exchanger 3, the outlet of the second circuit of the main heat exchanger 3 is connected to the liquid storage tank 4, the bottom outlet of the liquid storage tank 4 is connected to the second coolant outlet pipeline 5, the outlet of the second coolant outlet pipeline 5 is connected to the inlet of the equipment cooling pipeline 1, and the outlet of the second circuit of the auxiliary heat exchanger 6 is connected to the liquid storage tank 4. By arranging the main heat exchanger 3 above the liquid storage tank 4 and arranging the auxiliary heat exchanger 6 above the main heat exchanger 3, the second coolant can rely on gravity to flow from the outlet of the second circuit of the main heat exchanger 3 and the outlet of the second circuit of the auxiliary heat exchanger 6. The outlet of the secondary circuit flows into the liquid storage tank 4, and the main heat exchanger 3, the auxiliary heat exchanger 6 and the second coolant supply pipeline 2 are connected in series through the vacuum generating circuit, so that the internal air pressure of the first vacuum generating pipeline 7 and the second vacuum generating pipeline 10 is lower than the atmospheric pressure of the external environment, which effectively overcomes the problem of coolant leakage in conventional liquid cooling systems. The absolute pressure of atmospheric pressure is 1 bar. When the vacuum pump 8 maintains the pressure range in the main heat exchanger 3 at 0.3-0.4 bar, gravity and pressure difference circulation are utilized to reduce the circulation pump that provides circulation power for the second coolant to flow from the second coolant supply pipeline 2 to the second coolant outlet pipeline 5, thereby achieving the technical effect of self-circulation of the second coolant.

[0065] Furthermore, the second coolant supply pipeline 2 is also connected to a second pressure sensor 28 and a first temperature sensor 27;

[0066] The second pressure sensor 28 is used to detect the pressure of the second coolant, and the first temperature sensor 27 is used to detect the temperature of the second coolant;

[0067] The second vacuum generating pipeline 10 is connected to an exhaust pipeline 26 , and a first solenoid valve 11 is provided on the exhaust pipeline 26 . The second vacuum generating pipeline 10 is connected to a second solenoid valve 12 , and the second solenoid valve 12 is located between the exhaust pipeline 26 and the second coolant supply pipeline 2 .

[0068] It should be noted that the function of the first solenoid valve 11 and the second solenoid valve 12 is to control the exhaust of the vacuum pump 8. Since the exhaust gas may contain the gaseous second coolant that has not been completely condensed, under the premise of ensuring the negative pressure of the system, the exhaust gas of the vacuum pump 8 should be collected again as much as possible so that the gaseous second coolant that has not been completely condensed in the exhaust gas can continue to condense.

[0069] Furthermore, the second coolant outlet pipe 5 is also connected to a second temperature sensor 13 for detecting the temperature of the second coolant.

[0070] It should be noted that the second temperature sensor 13 in this embodiment is used to sense the temperature of the second coolant flowing out of the liquid storage tank 4 into the second coolant outlet pipe 5 .

[0071] Further, it includes a liquid storage tower 14, a first coolant supply pipeline 15, a first liquid supply pipeline 16, a first liquid outlet pipeline 17, a second liquid supply pipeline 18 and a second liquid outlet pipeline 19;

[0072] The inlet of the first coolant supply pipeline 15 is connected to the outlet of the liquid storage tower 14, and the inlet of the first liquid outlet pipeline 17 and the inlet of the second liquid outlet pipeline 19 are both connected to the outlet of the first coolant supply pipeline 15;

[0073] The outlet of the first liquid supply pipeline 16 is connected to the inlet of the first circuit of the main heat exchanger 3, and the outlet of the first circuit of the main heat exchanger 3 is connected to the inlet of the first liquid outlet pipeline 17, and the outlet of the first liquid outlet pipeline 17 is connected to the inlet of the liquid storage tower 14;

[0074] The outlet of the second liquid supply pipeline 18 is connected to the inlet of the first circuit of the auxiliary heat exchanger 6, and the outlet of the first circuit of the auxiliary heat exchanger 6 is connected to the inlet of the second liquid outlet pipeline 19, and the outlet of the second liquid outlet pipeline 19 is connected to the inlet of the liquid storage tower 14;

[0075] The first coolant supply pipeline 15 is connected to a first control valve 20 and a third temperature sensor 21 for detecting the temperature of the first coolant;

[0076] The second liquid supply pipeline 18 is connected to a second control valve 29;

[0077] The first liquid outlet pipeline 17 is connected to a fourth temperature sensor 23 for detecting the temperature of the first coolant flowing out of the main heat exchanger 3 , and the second liquid outlet pipeline 19 is connected to a fifth temperature sensor 22 for detecting the temperature of the first coolant flowing out of the auxiliary heat exchanger 6 .

[0078] It should be noted that the liquid storage tower 14 in this embodiment is loaded with the first coolant for cooling the second coolant in the main heat exchanger 3 and the auxiliary heat exchanger 6. The first coolant in the liquid storage tower 14 flows out to the first coolant supply pipeline 15, and then is divided into the first liquid supply pipeline 16 and the second liquid supply pipeline 18 at the outlet of the first coolant supply pipeline 15. The first coolant enters the first circuit of the main heat exchanger 3 through the first liquid supply pipeline 16, and the first coolant enters the first circuit of the auxiliary heat exchanger 6 through the second liquid supply pipeline 18. After heat exchange, the first coolant flows back to the liquid storage tower 14 from the outlet of the first circuit of the main heat exchanger 3 through the first liquid outlet pipeline 17, and the other first coolant flows back to the liquid storage tower 14 from the outlet of the first circuit of the auxiliary heat exchanger 6 through the second liquid outlet pipeline 19.

[0079] The above-mentioned third temperature sensor 21 is used to sense the temperature of the first coolant flowing out of the liquid storage tower 14, the first control valve 20 is used to control the flow rate of the first coolant in the first coolant supply pipeline 15, the second control valve 29 is used to control the flow rate of the first coolant in the second liquid supply pipeline 18, the fourth temperature sensor 23 is used to detect the temperature of the first coolant flowing out of the main heat exchanger 3, and the fifth temperature sensor 22 is used to detect the temperature of the first coolant flowing out of the auxiliary heat exchanger 6.

[0080] Furthermore, it also includes a third solenoid valve 25 and a one-way valve 24;

[0081] The outlet of the second circuit of the auxiliary heat exchanger 6 is connected to the liquid storage tank 4 through the third solenoid valve 25;

[0082] A low water level switch 602 and a high water level switch 601 are provided inside the auxiliary heat exchanger 6, and the high water level switch 601 is located above the low water level switch 602;

[0083] like Figure 2 As shown, a low water level switch 602 and a high water level switch 601 are provided inside the auxiliary heat exchanger 6. When the gaseous second coolant condenses in the auxiliary heat exchanger 6 and accumulates to the position of the high water level switch 601, both the low water level switch 602 and the high water level switch 601 will be closed. When the high water level switch 601 is closed, the third solenoid valve 25 is opened to discharge the condensed second coolant into the liquid storage tank 4. When the low water level switch 602 is disconnected, the drainage is completed, and then the third solenoid valve 25 is closed.

[0084] The outlet of the second circuit of the main heat exchanger 3 is connected to the liquid storage tank 4 through the one-way valve 24 .

[0085] It should be noted that, in terms of space, the auxiliary heat exchanger 6 and the main heat exchanger 3 are located higher than the water tank, so that the second coolant can flow from the main heat exchanger 3 into the liquid tank 4 by gravity, and the size of the height difference depends on the resistance of the equipment cooling pipeline 1. The greater the resistance, the greater the height difference required.

[0086] The function of the one-way valve 24 is to prevent the second coolant in the liquid storage tank 4 from volatilizing and flowing back into the main heat exchanger 3, because the gas pressure in the main heat exchanger 3 may be slightly lower than the gas pressure in the liquid storage tank 4. Only when the liquid in the main heat exchanger 3 accumulates to a certain amount can it flow out to the liquid storage tank 4 by gravity. Because the main heat exchanger 3 is always connected to the vacuum pump 8, the gas pressure in the main heat exchanger 3 can be maintained. The pressure in the liquid storage tank 4 may decrease as the second coolant inside, and the gas pressure in the liquid storage tank 4 will be greater than the gas pressure in the main heat exchanger 3. However, since there is liquid second coolant in the main heat exchanger 3, the gravity pressure is superimposed, and the liquid storage tank 4 is not filled with the second coolant and there is air, so the second coolant in the main heat exchanger 3 can enter the liquid storage tank 4 by gravity.

[0087] Embodiment 2

[0088] See also Figure 1 to Figure 2 In this embodiment, a self-circulating liquid cooling system control method is provided. The control method is used to control the self-circulating liquid cooling system as described in the first embodiment. The control method includes:

[0089] When it is detected that the detection value of the first pressure sensor 9 is greater than the first pressure setting value, the vacuum pump 8 is turned on;

[0090] When it is detected that the detection value of the first pressure sensor 9 is less than the second pressure setting value, the vacuum pump 8 is turned off.

[0091] It should be noted that the function of the vacuum pump 8 is to maintain the negative pressure of the system, and the control target is the inlet pressure of the vacuum pump 8. In the above process, the first pressure setting value can be set to 0.4 bar, and the second pressure setting value can be set to 0.3 bar. Through the above method, the pressure range in the main heat exchanger 3 is maintained at 0.3 bar to 0.4 bar.

[0092] It should be noted that, since the absolute pressure of atmospheric pressure is 1 bar, when the vacuum pump 8 maintains the pressure in the main heat exchanger 3 in the range of 0.3 bar to 0.4 bar, the problem of coolant leakage in the conventional liquid cooling system can be solved, ensuring that even if a leakage occurs, the second coolant will not leak out into the equipment.

[0093] Furthermore, the self-circulating liquid cooling system control method in this embodiment further includes:

[0094] The boiling point of the second coolant in the main heat exchanger 3 is calculated in real time according to the pressure value of the main heat exchanger 3 detected by the second pressure sensor 28, and compared with the detected value of the secondary side return water temperature, specifically:

[0095] When the difference between the boiling point and the detection value of the first temperature sensor 27 is less than the first temperature setting value, the control target value of the vacuum pump 8 is increased, that is, the inlet pressure of the vacuum pump 8 is increased until the difference between the boiling point and the detection value of the first temperature sensor 27 is greater than the first temperature setting value.

[0096] It should be noted that the above-mentioned first temperature setting value needs to be selected according to the actual operation of the system, and this embodiment does not limit the first temperature setting value.

[0097] Furthermore, the self-circulating liquid cooling system control method in this embodiment further includes:

[0098] The first solenoid valve 11 and the second solenoid valve 12 are used to control the exhaust of the vacuum pump 8. Since the exhaust may contain uncondensed second coolant, the exhaust should be collected again as much as possible while ensuring the negative pressure of the system.

[0099] To ensure the negative pressure of the system, when the detection value of the second pressure sensor 28 is detected to be greater than the third pressure setting value, the second solenoid valve 12 is closed and the first solenoid valve 11 is opened to ensure that the pressure of the gaseous second coolant in the second coolant supply pipeline 2 is less than the atmospheric pressure;

[0100] When it is detected that the detection value of the second pressure sensor 28 is less than the fourth pressure setting value, the first solenoid valve 11 is closed and the second solenoid valve 12 is opened to recover the uncondensed gaseous second coolant in the main heat exchanger 3 and the auxiliary heat exchanger 6 into the system for further condensation.

[0101] It should be noted that the above-mentioned third pressure setting value can be 0.95 bar, and the above-mentioned fourth pressure setting value can be 0.75 bar, that is, when the detection value of the second pressure sensor 28 is detected to be greater than 0.95 bar, the second solenoid valve 12 is closed and the first solenoid valve 11 is opened; when the detection value of the second pressure sensor 28 is detected to be less than 0.75 bar, the first solenoid valve 11 is closed and the second solenoid valve 12 is opened.

[0102] Furthermore, the self-circulating liquid cooling system control method in this embodiment further includes:

[0103] The first control valve 20 is used to control the supply flow of the first coolant supply pipeline, and then the temperature of the second coolant in the second coolant outlet pipeline 5 is controlled. The specific control process is:

[0104] When it is detected that the detection value of the second temperature sensor 13 is greater than the third temperature setting value, the opening of the first control valve 20 is increased;

[0105] When it is detected that the detection value of the second temperature sensor 13 is less than the second temperature setting value, the opening of the first control valve 20 is reduced;

[0106] It should be noted that the second temperature setting value may be 33°C, and the third temperature setting value may be 37°C. When the detection value of the second temperature sensor 13 is greater than 37°C, the opening of the first control valve 20 is increased, and when the detection value of the second temperature sensor 13 is less than 33°C, the opening of the first control valve 20 is decreased. The opening of the first control valve 20 is controlled in real time by the temperature of the second coolant in the second coolant outlet pipe 5 sensed by the second temperature sensor 13, so that the temperature of the second coolant in the second coolant outlet pipe 5 is maintained within a reasonable temperature level range.

[0107] Calculate the dew point temperature in real time through the detection values ​​of the temperature and humidity sensor;

[0108] When the detection value of the second temperature sensor 13 is detected to be greater than (dew point temperature + safety value + hysteresis), the opening of the first control valve 20 is increased;

[0109] When it is detected that the detection value of the second temperature sensor 13 is less than (dew point temperature+safety value-hysteresis), the opening degree of the first control valve 20 is reduced.

[0110] The above safety value is selected according to the actual operation of the system, and the above hysteresis is determined according to relevant detection instruments.

[0111] It should be noted that, through the above control method, the second coolant temperature in the second coolant outlet pipe 5 is prevented from being too low, thereby preventing condensation from occurring.

[0112] Furthermore, the self-circulating liquid cooling system control method in this embodiment further includes:

[0113] The flow rate of the first coolant in the second liquid supply pipeline 18 is controlled by controlling the opening of the second control valve 29, so that the outflow temperature of the first coolant in the auxiliary heat exchanger 6 is equal to the outflow temperature of the first coolant in the main heat exchanger 3, so as to ensure that the first coolant can perform sufficient heat exchange. The specific control process is:

[0114] When the detected value of the fifth temperature sensor 22 is greater than (the detected value of the fourth temperature sensor 23 + the hysteresis), the opening of the second control valve 29 is increased;

[0115] When the detected value of the fifth temperature sensor 22 is less than (the detected value of the fourth temperature sensor 23 - the hysteresis), the opening degree of the second control valve 29 is reduced.

[0116] It should be noted that the above hysteresis is set to 0.5°C, which is determined according to the specific instrument. When the detection value of the fifth temperature sensor 22 is greater than the detection value of the fourth temperature sensor 23+0.5°C, the opening of the second control valve 29 is increased. When the detection value of the fifth temperature sensor 22 is less than the detection value of the fourth temperature sensor 23-0.5°C, the opening of the second control valve 29 is decreased.

[0117] The above is a detailed introduction to a self-circulating liquid cooling system and control method provided by the present invention. For a person skilled in the art, according to the idea of ​​the embodiments of the present invention, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A self-circulating liquid cooling system, characterized in that: It includes main heat exchanger, auxiliary heat exchanger, equipment cooling pipeline, liquid storage tank and vacuum generating circuit; The main heat exchanger and the auxiliary heat exchanger both include a first circuit and a second circuit that are isolated from each other, and the first coolant in the first circuit is used to cool the second coolant in the second circuit; the top of the main heat exchanger and the top of the auxiliary heat exchanger are both provided with a gaseous second coolant outlet; The outlet of the equipment cooling pipeline is connected to a second coolant supply pipeline, the outlet of the second coolant supply pipeline is connected to the inlet of the second circuit of the main heat exchanger, the outlet of the second circuit of the main heat exchanger is connected to the liquid storage tank, the liquid storage tank is located below the main heat exchanger, the bottom outlet of the liquid storage tank is connected to a second coolant outlet pipeline, the outlet of the second coolant outlet pipeline is connected to the inlet of the equipment cooling pipeline; The auxiliary heat exchanger is located above the main heat exchanger, and the vacuum generating circuit includes a first vacuum generating pipeline, a second vacuum generating pipeline, a vacuum pump, and a first pressure sensor for detecting the inlet pressure of the vacuum pump; The first port of the first vacuum generating pipeline is connected to the gaseous second coolant outlet of the main heat exchanger, the second port of the first vacuum generating pipeline is connected to the inlet of the second circuit of the auxiliary heat exchanger, the first pressure sensor and the vacuum pump are connected to the first vacuum generating pipeline, the gaseous second coolant outlet of the auxiliary heat exchanger is connected to the first port of the second vacuum generating pipeline, the second port of the second vacuum generating pipeline is connected to the second coolant supply pipeline, and the outlet of the second circuit of the auxiliary heat exchanger is connected to the liquid storage tank.

2. The self-circulating liquid cooling system according to claim 1, characterized in that: The second coolant supply pipeline is also connected to a second pressure sensor and a first temperature sensor; The second pressure sensor is used to detect the pressure of the second coolant, and the first temperature sensor is used to detect the temperature of the second coolant; The second vacuum generating pipeline is connected to an exhaust pipeline, a first solenoid valve is arranged on the exhaust pipeline, the second vacuum generating pipeline is connected to a second solenoid valve, and the second solenoid valve is located between the exhaust pipeline and the second coolant supply pipeline.

3. The self-circulating liquid cooling system according to claim 1, characterized in that: The second coolant outlet pipe is also connected to a second temperature sensor for detecting the temperature of the second coolant.

4. The self-circulating liquid cooling system according to claim 3 is characterized in that: It includes a liquid storage tower, a first coolant supply pipeline, a first liquid supply pipeline, a first liquid outlet pipeline, a second liquid supply pipeline and a second liquid outlet pipeline; The inlet of the first coolant supply pipeline is connected to the outlet of the liquid storage tower, and the inlet of the first liquid outlet pipeline and the inlet of the second liquid outlet pipeline are both connected to the outlet of the first coolant supply pipeline; The outlet of the first liquid supply pipeline is connected to the inlet of the first circuit of the main heat exchanger, and the outlet of the first circuit of the main heat exchanger is connected to the inlet of the first liquid outlet pipeline, and the outlet of the first liquid outlet pipeline is connected to the inlet of the liquid storage tower; The outlet of the second liquid supply pipeline is connected to the inlet of the first circuit of the auxiliary heat exchanger, and the outlet of the first circuit of the auxiliary heat exchanger is connected to the inlet of the second liquid outlet pipeline, and the outlet of the second liquid outlet pipeline is connected to the inlet of the liquid storage tower; The first coolant supply pipeline is connected with a first control valve and a third temperature sensor for detecting the temperature of the first coolant; The second liquid supply pipeline is connected with a second control valve; The first liquid outlet pipeline is connected to a fourth temperature sensor for detecting the temperature of the first coolant flowing out of the main heat exchanger, and the second liquid outlet pipeline is connected to a fifth temperature sensor for detecting the temperature of the first coolant flowing out of the auxiliary heat exchanger.

5. The self-circulating liquid cooling system according to claim 1, characterized in that: Also includes a third solenoid valve and a one-way valve; The outlet of the second circuit of the auxiliary heat exchanger is connected to the liquid storage tank through the third solenoid valve; A low water level switch and a high water level switch are provided inside the auxiliary heat exchanger, and the high water level switch is located above the low water level switch; The outlet of the second circuit of the main heat exchanger is connected to the liquid storage tank through the one-way valve.

6. A self-circulating liquid cooling system control method, characterized in that: The control method is used to control the self-circulating liquid cooling system according to any one of claims 1 to 5, and the control method comprises: When it is detected that the detection value of the first pressure sensor is greater than the first pressure setting value, the vacuum pump is turned on; When it is detected that the detection value of the first pressure sensor is less than the second pressure setting value, the vacuum pump is turned off.

7. The self-circulating liquid cooling system control method according to claim 6, characterized in that: Also includes: The control target of the vacuum pump is the vacuum pump inlet pressure, and the boiling point of the second coolant in the main heat exchanger is calculated in real time according to the pressure value of the main heat exchanger detected by the second pressure sensor; When the difference between the boiling point and the detection value of the first temperature sensor is less than the first temperature setting value, the control target value of the vacuum pump is increased until the difference between the boiling point and the detection value of the first temperature sensor is greater than the first temperature setting value.

8. The self-circulating liquid cooling system control method according to claim 6, characterized in that: Also includes: When it is detected that the detection value of the second pressure sensor is greater than the third pressure setting value, the second solenoid valve is closed and the first solenoid valve is opened; When it is detected that the detection value of the second pressure sensor is less than the fourth pressure setting value, the first solenoid valve is closed and the second solenoid valve is opened.

9. The self-circulating liquid cooling system control method according to claim 6, characterized in that: Also includes: The first control valve is used to control the supply flow of the first coolant supply pipeline, and then the temperature of the second coolant in the second coolant outlet pipeline is controlled. The specific control process is: When it is detected that the detection value of the second temperature sensor is greater than the third temperature setting value, the opening of the first control valve is increased; When it is detected that the detection value of the second temperature sensor is less than the second temperature setting value, the opening of the first control valve is reduced; Alternatively, the dew point temperature is calculated in real time through the detection values ​​of the temperature and humidity sensor; When the detection value of the second temperature sensor is detected to be greater than (dew point temperature + safety value + hysteresis), the opening of the first control valve is increased; When it is detected that the detection value of the second temperature sensor is less than (dew point temperature+safety value-hysteresis), the opening of the first control valve is reduced.

10. The self-circulating liquid cooling system control method according to claim 6, characterized in that: Also includes: The flow rate of the first coolant in the second liquid supply pipeline is controlled by controlling the opening of the second control valve, so that the outflow temperature of the first coolant in the auxiliary heat exchanger is equal to the outflow temperature of the first coolant in the main heat exchanger. The specific control process is: When the detected value of the fifth temperature sensor is greater than (the detected value of the fourth temperature sensor + the hysteresis), the opening of the second control valve is increased; When the detected value of the fifth temperature sensor is less than (the detected value of the fourth temperature sensor-the hysteresis), the opening degree of the second control valve is reduced.

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