CN114501955A - Self-circulation type liquid cooling system and control method - Google Patents
Self-circulation type liquid cooling system and control method Download PDFInfo
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- CN114501955A CN114501955A CN202210162959.XA CN202210162959A CN114501955A CN 114501955 A CN114501955 A CN 114501955A CN 202210162959 A CN202210162959 A CN 202210162959A CN 114501955 A CN114501955 A CN 114501955A
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- 239000007788 liquid Substances 0.000 title claims abstract description 161
- 238000001816 cooling Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000000110 cooling liquid Substances 0.000 claims abstract description 170
- 238000001514 detection method Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000002826 coolant Substances 0.000 claims description 12
- 238000009835 boiling Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 230000005484 gravity Effects 0.000 description 11
- 239000012530 fluid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 238000013461 design Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/208—Liquid cooling with phase change
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20836—Thermal management, e.g. server temperature control
Abstract
The invention discloses a self-circulation type liquid cooling system and a control method thereof, which are used for solving the technical problem that the circulating flow of cooling liquid is realized by a circulating pump in the conventional liquid cooling system. The equipment cooling pipeline is connected with a second cooling liquid supply pipeline, the second cooling liquid supply pipeline is connected with a second loop of the main heat exchanger, the second loop of the main heat exchanger is connected with the liquid storage tank, a bottom outlet of the liquid storage tank is connected with a second cooling liquid outlet pipeline, and the second cooling liquid outlet pipeline is connected with the equipment cooling pipeline; the first vacuum generation pipeline is connected with a gaseous second cooling liquid outlet of the main heat exchanger, the first vacuum generation pipeline is connected with an inlet of a second loop of the auxiliary heat exchanger, the first pressure sensor and the vacuum pump are connected on the first vacuum generation pipeline, a gaseous second cooling liquid outlet of the auxiliary heat exchanger is connected with a second vacuum generation pipeline, the second vacuum generation pipeline is connected with a second cooling liquid supply pipeline, and the auxiliary heat exchanger is connected with the liquid storage tank.
Description
Technical Field
The invention relates to the technical field of liquid cooling system design, in particular to a self-circulation type liquid cooling system and a control method.
Background
At present, an air-cooled heat dissipation scheme is commonly used in a data center, but for application scenes with higher and higher heat flux density, the air-cooled heat dissipation is difficult to meet practical application, and a liquid-cooled heat dissipation scheme is required.
Liquid cooling systems typically include equipment cooling lines, heat exchangers, lines, circulation pumps, and various sensors. The equipment cooling pipeline is used for absorbing heat of equipment (such as a server), fluid in the equipment cooling pipeline is transferred to a heat exchanger through the pipeline, a vacuum pump and a circulating pump, and the heat exchanger can transfer heat of hot fluid to another cold fluid, so that a cooling effect is achieved; 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 for adjusting the flow velocity of the cooling liquid in the pipeline, so that the heat exchange speed of the cooling liquid is adjusted, therefore, in the existing liquid cooling system, the cooling liquid in the pipeline needs the circulating pump to provide flowing power for the cooling liquid, and the circulating flow can be realized in the pipeline.
Therefore, in order to solve the above technical problems, it is an important subject of research by those skilled in the art to find a self-circulation type liquid cooling system and a control method.
Disclosure of Invention
The embodiment of the invention discloses a self-circulation type liquid cooling system and a control method thereof, which are used for solving the technical problem that the circulating flow of cooling liquid is realized by a circulating pump in the conventional liquid cooling system.
The embodiment of the invention provides a self-circulation type liquid cooling system, which comprises a main heat exchanger, an auxiliary heat exchanger, an equipment cooling pipeline, a liquid storage tank and a vacuum generating loop, wherein the main heat exchanger is connected with the auxiliary heat exchanger through the auxiliary heat exchanger;
the main heat exchanger and the auxiliary heat exchanger both comprise a first loop and a second loop which are isolated from each other, and the first cooling liquid in the first loop is used for cooling the second cooling liquid in the second loop; the top of the main heat exchanger and the top of the auxiliary heat exchanger are both provided with a gaseous second cooling liquid outlet;
an outlet of the equipment cooling pipeline is connected with a second cooling liquid supply pipeline, an outlet of the second cooling liquid supply pipeline is connected with an inlet of a second loop of the main heat exchanger, an outlet of the second loop of the main heat exchanger is connected with the liquid storage tank, the liquid storage tank is positioned below the main heat exchanger, an outlet at the bottom of the liquid storage tank is connected with a second cooling liquid outlet pipeline, and an outlet of the second cooling liquid outlet pipeline is connected with an inlet of the equipment cooling pipeline;
the auxiliary heat exchanger is positioned above the main heat exchanger, and the vacuum generating loop comprises a first vacuum generating pipeline, a second vacuum generating pipeline, a vacuum pump and a first pressure sensor for detecting the pressure of an inlet of the vacuum pump;
the first port of the first vacuum generation pipeline is connected with the gaseous second cooling liquid outlet of the main heat exchanger, the second port of the first vacuum generation pipeline is connected with the inlet of the second loop of the auxiliary heat exchanger, the first pressure sensor and the vacuum pump are connected to the first vacuum generation pipeline, the gaseous second cooling liquid outlet of the auxiliary heat exchanger is connected with the first port of the second vacuum generation pipeline, the second port of the second vacuum generation pipeline is connected with the second cooling liquid supply pipeline, and the outlet of the second loop of the auxiliary heat exchanger is connected with the liquid storage tank.
Optionally, a second pressure sensor and a first temperature sensor are further connected to the second cooling liquid supply pipeline;
the second pressure sensor is used for detecting the pressure of the second cooling liquid, and the first temperature sensor is used for detecting the temperature of the second cooling liquid;
the second vacuum generating pipeline is connected with an exhaust pipeline, the exhaust pipeline is provided with a first electromagnetic valve, the second vacuum generating pipeline is connected with a second electromagnetic valve, and the second electromagnetic valve is located between the exhaust pipeline and the second cooling liquid supply pipeline.
Optionally, a second temperature sensor for detecting the temperature of the second cooling liquid is further connected to the second cooling liquid outlet pipeline.
Optionally, the cooling system comprises a liquid storage tower, a first cooling liquid supply pipeline, a first liquid outlet pipeline, a second liquid supply pipeline and a second liquid outlet pipeline;
an inlet of the first cooling liquid supply pipeline is connected with an outlet of the liquid storage tower, and an inlet of the first liquid outlet pipeline and an inlet of the second liquid outlet pipeline are both connected with an outlet of the first cooling liquid supply pipeline;
an outlet of the first liquid supply pipeline is communicated with an inlet of a first loop of the main heat exchanger, an outlet of the first loop of the main heat exchanger is connected with an inlet of a first liquid outlet pipeline, and an outlet of the first liquid outlet pipeline is connected with an inlet of the liquid storage tower;
an outlet of the second liquid supply pipeline is communicated with an inlet of the first loop of the auxiliary heat exchanger, an outlet of the first loop of the auxiliary heat exchanger is connected with an inlet of the second liquid outlet pipeline, and an outlet of the second liquid outlet pipeline is connected with an inlet of the liquid storage tower;
the first cooling liquid supply pipeline is connected with a first control valve and a third temperature sensor for detecting the temperature of the first cooling liquid;
the second liquid supply pipeline is connected with a second control valve;
and the first liquid outlet pipeline is connected with a fourth temperature sensor for detecting the temperature of the first cooling liquid flowing out of the main heat exchanger, and the second liquid outlet pipeline is connected with a fifth temperature sensor for detecting the temperature of the first cooling liquid flowing out of the auxiliary heat exchanger.
Optionally, the system further comprises a third electromagnetic valve and a one-way valve;
an outlet of the second loop of the auxiliary heat exchanger is connected with the liquid storage tank through the third electromagnetic valve;
a low water level switch and a high water level switch are arranged in the auxiliary heat exchanger, and the high water level switch is positioned above the low water level switch;
and the outlet of the second loop of the main heat exchanger is connected with the liquid storage tank through the one-way valve.
The embodiment of the invention provides a control method of a self-circulation type liquid cooling system, which is used for controlling the self-circulation type liquid cooling system and comprises the following steps:
when the detected value of the first pressure sensor is larger than a first pressure set value, starting a vacuum pump;
and when the detected value of the first pressure sensor is less than the second pressure set value, the vacuum pump is closed.
Optionally, the method further comprises:
the control target of the vacuum pump is the inlet pressure of the vacuum pump, and the boiling point of second cooling liquid 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;
and when the difference value between the boiling point and the detection value of the first temperature sensor is smaller than the first temperature set value, the control target value of the vacuum pump is increased until the difference value between the boiling point and the detection value of the first temperature sensor is larger than the first temperature set value.
Optionally, the method further comprises:
when the detected value of the second pressure sensor is larger than a third pressure set value, closing the second electromagnetic valve and opening the first electromagnetic valve;
and when the detected value of the second pressure sensor is smaller than the fourth pressure set value, closing the first electromagnetic valve and opening the second electromagnetic valve.
Optionally, the method further comprises:
the first control valve is used for controlling the supply flow of the first cooling liquid supply pipeline and then controlling the temperature of the second cooling liquid in the second cooling liquid outlet pipeline, and the specific control process is as follows:
when the detected value of the second temperature sensor is larger than a third temperature set value, the opening degree of the first control valve is increased;
when the detected value of the second temperature sensor is smaller than a second temperature set value, the opening degree of the first control valve is reduced;
or calculating the dew point temperature in real time according to the detection value of the temperature and humidity sensor;
when detecting that the detection value of the second temperature sensor is > (dew point temperature + safety value + return difference), increasing the opening degree of the first control valve;
when the detected value < (dew point temperature + safety value-return difference) of the second temperature sensor is detected, the opening degree of the first control valve is reduced.
Optionally, the method further comprises:
the flow of the first cooling liquid of the second liquid supply pipeline is controlled by controlling the opening degree of the second control valve, so that the outflow temperature of the first cooling liquid of the auxiliary heat exchanger is equal to the outflow temperature of the first cooling liquid of the main heat exchanger, and the specific control process is as follows:
increasing the opening degree of the second control valve when the detected detection value of the fifth temperature sensor > (detection value of the fourth temperature sensor + return difference);
when the detected value of the fifth temperature sensor is < (the detected value of the fourth temperature sensor — the return difference), the opening degree of the second control valve is adjusted smaller.
According to the technical scheme, the embodiment of the invention has the following advantages:
in the embodiment, the outlet of the equipment cooling pipeline is connected with a second cooling liquid supply pipeline, the outlet of the second cooling liquid supply pipeline is connected with the inlet of the second loop of the main heat exchanger, the outlet of the second loop of the main heat exchanger is connected with the liquid storage tank, the outlet of the bottom of the liquid storage tank is connected with a second cooling liquid outlet pipeline, the outlet of the second cooling liquid outlet pipeline is connected with the inlet of the equipment cooling pipeline, the outlet of the second loop of the auxiliary heat exchanger is connected with the liquid storage tank, the main heat exchanger is arranged above the liquid storage tank, the auxiliary heat exchanger is arranged above the main heat exchanger, so that the second cooling liquid can flow into the liquid storage tank from the outlet of the second loop of the main heat exchanger and the outlet of the second loop of the auxiliary heat exchanger by means of gravity, and the main heat exchanger, the auxiliary heat exchanger and the second cooling liquid supply pipeline are connected in series through the vacuum generation loop, the internal air pressure of the first vacuum generation pipeline and the second vacuum generation pipeline is lower than the atmospheric pressure of the external environment, the absolute pressure of the atmospheric pressure is 1bar, and under the condition that the vacuum pump maintains the pressure range in the main heat exchanger to be 0.3-0.4 bar, the circulation pump can reduce the circulating power provided for the second cooling liquid to flow from the second cooling liquid supply pipeline to the second cooling liquid outlet pipeline by utilizing gravity and pressure difference circulation, so that the technical effect of self-circulation of the second cooling liquid is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a self-circulating liquid cooling system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an auxiliary heat exchanger in a self-circulation liquid cooling system according to an embodiment of the present invention;
illustration of the drawings: an equipment cooling pipeline 1; a second coolant supply line 2; a main heat exchanger 3; a liquid storage tank 4; a second cooling liquid outlet pipeline 5; an auxiliary heat exchanger 6; a high water level switch 601; a low level switch 602; a first vacuum generation line 7; a vacuum pump 8; a first pressure sensor 9; a second vacuum generating line 10; a first electromagnetic valve 11; a second electromagnetic valve 12; a second temperature sensor 13; a liquid storage tower 14; a first coolant supply line 15; a first supply line 16; a first liquid outlet line 17; a second supply line 18; a second outlet line 19; a first control valve 20; a third temperature sensor 21; a fifth temperature sensor 22; a fourth temperature sensor 23; a check valve 24; a third electromagnetic valve 25; an exhaust line 26; a first temperature sensor 27; a second pressure sensor 28; a second control valve 29.
Detailed Description
The embodiment of the invention discloses a self-circulation type liquid cooling system and a control method thereof, which are used for solving the technical problem that the circulating flow of cooling liquid is realized by a circulating pump in the conventional liquid cooling system.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1 to fig. 2, a self-circulation liquid cooling system provided in the present embodiment includes:
the system comprises a main heat exchanger 3, an auxiliary heat exchanger 6, an equipment cooling pipeline 1, a liquid storage tank 4 and a vacuum generating loop;
the main heat exchanger 3 and the auxiliary heat exchanger 6 both comprise a first loop and a second loop which are isolated from each other, and the first cooling liquid in the first loop is used for cooling the second cooling liquid in the second loop; the top of the main heat exchanger 3 and the top of the auxiliary heat exchanger 6 are both provided with a gaseous second cooling liquid outlet;
an outlet of the equipment cooling pipeline 1 is connected with a second cooling liquid supply pipeline 2, an outlet of the second cooling liquid supply pipeline 2 is connected with an inlet of a second loop of the main heat exchanger 3, an outlet of the second loop of the main heat exchanger 3 is connected with the liquid storage tank 4, the liquid storage tank 4 is positioned below the main heat exchanger 3, an outlet at the bottom of the liquid storage tank 4 is connected with a second cooling liquid water outlet pipeline 5, and an outlet of the second cooling liquid water outlet pipeline 5 is connected with an inlet of the equipment cooling pipeline 1;
the auxiliary heat exchanger 6 is positioned above the main heat exchanger 3, and the vacuum generating loop comprises 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;
the first port of the first vacuum generation pipeline 7 is connected with the gaseous second cooling liquid outlet of the main heat exchanger 3, the second port of the first vacuum generation pipeline 7 is connected with the inlet of the second loop of the auxiliary heat exchanger 6, the first pressure sensor 9 and the vacuum pump 8 are connected on the first vacuum generation pipeline 7, the gaseous second cooling liquid outlet of the auxiliary heat exchanger 6 is connected with the first port of the second vacuum generation pipeline 10, the second port of the second vacuum generation pipeline 10 is connected with the second cooling liquid supply pipeline 2, and the outlet of the second loop of the auxiliary heat exchanger 6 is connected with the liquid storage tank 4.
Specifically, in space, the auxiliary heat exchanger 6 and the main heat exchanger 3 are positioned higher than the water storage tank, so that the second cooling liquid can flow into the liquid storage tank 4 from the main heat exchanger 3 and the auxiliary heat exchanger 6 by gravity, the height difference depends on the resistance of the equipment cooling pipeline 1, and the height difference required by the resistance is larger.
It should be noted that the basic working principle of the self-circulation liquid cooling system in this example is as follows:
when the system is started to operate, first cooling liquid is injected into the first loop of the main heat exchanger 3 and the first loop of the auxiliary heat exchanger 6, high-temperature second cooling liquid from the equipment enters the second loop of the main heat exchanger 3 through the second cooling liquid supply pipeline 2, the high-temperature second cooling liquid is converted into low-temperature second cooling liquid after heat exchange of the main heat exchanger 3 and enters the liquid storage tank 4 under the action of gravity, part of the second cooling liquid enters the auxiliary heat exchanger 6 through the gaseous second cooling liquid outlet of the main heat exchanger 3 and the first vacuum generation pipeline 7 and is continuously cooled into low-temperature working liquid, the low-temperature working liquid flows into the liquid storage tank 4 under the action of gravity, and then the second cooling liquid in the liquid storage tank 4 enters the equipment cooling pipeline 1 again through the second cooling liquid outlet pipeline 5. At the same time, the vacuum pump 8 in the vacuum generating circuit is started to work, the first vacuum generating pipeline 7, the second vacuum generating pipeline 10, the second cooling liquid supply pipeline 2 and the second cooling liquid outlet pipeline 5 are maintained to be in a negative pressure state, the gaseous second cooling liquid in the system is sucked back to the main heat exchanger 3 and the auxiliary heat exchanger 6 for condensation, and even if leakage occurs, the second cooling liquid cannot leak to the server outwards.
In this embodiment, the outlet of the equipment cooling pipeline 1 is connected with a second cooling liquid supply pipeline 2, the outlet of the second cooling liquid supply pipeline 2 is connected with the inlet of the second loop of the main heat exchanger 3, the outlet of the second loop of the main heat exchanger 3 is connected with the liquid storage tank 4, the bottom outlet of the liquid storage tank 4 is connected with a second cooling liquid outlet pipeline 5, the outlet of the second cooling liquid outlet pipeline 5 is connected with the inlet of the equipment cooling pipeline 1, the outlet of the second loop of the auxiliary heat exchanger 6 is connected with the liquid storage tank 4, the main heat exchanger 3 is arranged above the liquid storage tank 4, the auxiliary heat exchanger 6 is arranged above the main heat exchanger 3, so that the second cooling liquid can flow into the liquid storage tank 4 from the outlet of the second loop of the main heat exchanger 3 and the outlet of the second loop of the auxiliary heat exchanger 6 by gravity, and the main heat exchanger 3, the auxiliary heat exchanger 6 and the vacuum generating loop are connected by a vacuum generating loop, The auxiliary heat exchanger 6 and the second cooling liquid supply pipeline 2 are connected in series, the internal air pressure of the first vacuum generation pipeline 7 and the second vacuum generation pipeline 10 is lower than the atmospheric pressure of the external environment, the problem that cooling liquid leakage is easy to occur in a conventional liquid cooling system is effectively solved, the absolute pressure of the atmospheric pressure is 1bar, under the condition that the vacuum pump 8 maintains the pressure range in the main heat exchanger 3 to be 0.3-0.4 bar, gravity and pressure difference circulation are utilized, a circulating pump which provides circulating power for the second cooling liquid to flow from the second cooling liquid supply pipeline 2 to the second cooling liquid water outlet pipeline 5 can be reduced, and the technical effect of self circulation of the second cooling liquid is achieved.
Further, a second pressure sensor 28 and a first temperature sensor 27 are connected to the second coolant supply line 2;
the second pressure sensor 28 is used for detecting the pressure of the second cooling liquid, and the first temperature sensor 27 is used for detecting the temperature of the second cooling liquid;
an exhaust pipeline 26 is connected to the second vacuum generation pipeline 10, a first electromagnetic valve 11 is arranged on the exhaust pipeline 26, a second electromagnetic valve 12 is connected to the second vacuum generation pipeline 10, and the second electromagnetic valve 12 is located between the exhaust pipeline 26 and the second cooling liquid supply pipeline 2.
It should be noted that, the first electromagnetic valve 11 and the second electromagnetic valve 12 are used for controlling the exhaust of the vacuum pump 8, and the exhaust may contain the gaseous second cooling liquid that is not completely condensed, so that the exhaust of the vacuum pump 8 needs to be collected again as much as possible on the premise of ensuring the negative pressure of the system, so that the gaseous second cooling liquid that is not completely condensed in the exhaust continues to be completely condensed.
Further, a second temperature sensor 13 for detecting the temperature of the second cooling liquid is connected to the second cooling liquid outlet pipeline 5.
The second temperature sensor 13 in the present embodiment is used to sense the temperature of the second coolant flowing out from the reservoir 4 to the second coolant outlet pipe 5.
Further, the cooling system comprises a liquid storage tower 14, a first cooling liquid 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;
an inlet of the first cooling liquid supply pipeline 15 is connected with an outlet of the liquid storage tower 14, and an inlet of the first liquid outlet pipeline 17 and an inlet of the second liquid outlet pipeline 19 are both connected with an outlet of the first cooling liquid supply pipeline 15;
an outlet of the first liquid supply pipeline 16 is communicated with an inlet of a first loop of the main heat exchanger 3, an outlet of the first loop of the main heat exchanger 3 is connected with an inlet of the first liquid outlet pipeline 17, and an outlet of the first liquid outlet pipeline 17 is connected with an inlet of the liquid storage tower 14;
the outlet of the second liquid supply pipeline 18 is communicated with the inlet of the first loop of the auxiliary heat exchanger 6, the outlet of the first loop of the auxiliary heat exchanger 6 is connected with the inlet of the second liquid outlet pipeline 19, and the outlet of the second liquid outlet pipeline 19 is connected with the inlet of the liquid storage tower 14;
a first control valve 20 and a third temperature sensor 21 for detecting the temperature of the first cooling liquid are connected to the first cooling liquid supply line 15;
a second control valve 29 is connected to the second liquid supply pipeline 18;
the first liquid outlet pipe 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 pipe 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.
It should be noted that, in this embodiment, the first cooling liquid for cooling the second cooling liquid in the main heat exchanger 3 and the auxiliary heat exchanger 6 is loaded in the liquid storage tower 14, the first cooling liquid in the liquid storage tower 14 flows out to the first cooling liquid supply pipeline 15, and then is branched to the first liquid supply pipeline 16 and the second liquid supply pipeline 18 at the outlet of the first cooling liquid supply pipeline 15, the first cooling liquid enters the first loop of the main heat exchanger 3 through the first liquid supply pipeline 16, the first cooling liquid enters the first loop of the auxiliary heat exchanger 6 through the second liquid supply pipeline 18, after heat exchange, the first cooling liquid flows back into the liquid storage tower 14 from the outlet of the first loop of the main heat exchanger 3 through the first liquid outlet pipeline 17, and the other first cooling liquid flows back into the liquid storage tower 14 from the outlet of the first loop of the auxiliary heat exchanger 6 through the second liquid outlet pipeline 19.
The third temperature sensor 21 is used for sensing the temperature of the first cooling liquid flowing out of the liquid storage tower 14, the first control valve 20 is used for controlling the flow rate of the first cooling liquid in the first cooling liquid supply pipeline 15, the second control valve 29 is used for controlling the flow rate of the first cooling liquid in the second liquid supply pipeline 18, the fourth temperature sensor 23 is used for detecting the temperature of the first cooling liquid flowing out of the main heat exchanger 3, and the fifth temperature sensor 22 is used for detecting the temperature of the first cooling liquid flowing out of the auxiliary heat exchanger 6.
Further, a third electromagnetic valve 25 and a one-way valve 24 are also included;
the outlet of the second loop of the auxiliary heat exchanger 6 is connected with the liquid storage tank 4 through the third electromagnetic valve 25;
a low water level switch 602 and a high water level switch 601 are arranged inside the auxiliary heat exchanger 6, and the high water level switch 601 is positioned above the low water level switch 602;
as shown in fig. 2, a low water level switch 602 and a high water level switch 601 are disposed inside the auxiliary heat exchanger 6, and when the gaseous second cooling liquid condenses inside 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 are closed. When the high level switch 601 is closed, the third electromagnetic valve 25 is opened to discharge the condensed second cooling liquid into the liquid storage tank 4, and when the low level switch 602 is turned off, the liquid discharge is completed, and then the third electromagnetic valve 25 is closed.
The outlet of the second circuit of the main heat exchanger 3 is connected to the reservoir 4 via the non-return valve 24.
It should be noted that, in space, the auxiliary heat exchanger 6 and the main heat exchanger 3 are located higher than the water storage tank, so that the second cooling liquid can flow into the liquid storage tank 4 from the main heat exchanger 3 by gravity, and the height difference depends on the resistance of the cooling pipeline 1 of the equipment, and the larger the height difference is, the larger the resistance is, the larger the height difference is.
The check valve 24 is used for preventing the second cooling liquid 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 of the liquid storage tank 4, only when the liquid in the main heat exchanger 3 accumulates to a certain amount, the liquid storage tank 4 can be flowed out by gravity, because the main heat exchanger 3 is always connected with 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 be reduced along with the second cooling liquid inside, and the gas pressure in the liquid storage tank 4 can be greater than the gas pressure in the main heat exchanger 3. However, since the liquid second cooling liquid is in the main heat exchanger 3, the gravity pressure is superposed, and the liquid storage tank 4 is not filled with the second cooling liquid and has air, the second cooling liquid in the main heat exchanger 3 can enter the liquid storage tank 4 by means of gravity.
Example two
Referring to fig. 1 to fig. 2, in the present embodiment, a method for controlling a self-circulation liquid cooling system is provided, where the method is used to control the self-circulation liquid cooling system according to the first embodiment, and the method includes:
when detecting that the detection value of the first pressure sensor 9 is larger than a first pressure set value, starting the vacuum pump 8;
when detecting that the detection value of the first pressure sensor 9 is less than the second pressure set value, the vacuum pump 8 is turned off.
It should be noted that, the vacuum pump 8 is used to maintain the negative pressure of the system, the control target is the inlet pressure of the vacuum pump 8, in the above process, the first pressure setting value may be set to 0.4bar, the second pressure setting value may be set to 0.3bar, and the pressure range in the main heat exchanger 3 is maintained to be 0.3bar to 0.4bar by the above method.
It should be noted that, since the absolute pressure of the atmospheric pressure is 1bar, in the case that the vacuum pump 8 maintains the pressure in the main heat exchanger 3 in the range of 0.3bar to 0.4bar, the problem that the conventional liquid cooling system is prone to leakage of the cooling liquid can be solved, and it is ensured that even if leakage occurs, the second cooling liquid will not leak out into the apparatus.
Further, the method for controlling a self-circulation liquid cooling system in this embodiment further includes:
the boiling point of the second cooling liquid 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 is compared with the detection value of the secondary side return water temperature, and the method specifically comprises the following steps:
when the difference between the boiling point and the detection value of the first temperature sensor 27 is smaller than the first temperature setting value, the control target value of the large vacuum pump 8, that is, the inlet pressure of the large vacuum pump 8 is adjusted until the difference between the boiling point and the detection value of the first temperature sensor 27 is larger than the first temperature setting value.
It should be noted that the first temperature setting value needs to be selected according to the actual operation condition of the system, and the first temperature setting value is not limited in this embodiment.
Further, the method for controlling a self-circulation liquid cooling system in this embodiment further includes:
the first electromagnetic valve 11 and the second electromagnetic valve 12 are used for controlling the exhaust of the vacuum pump 8, and the exhaust may contain the uncondensed second cooling liquid, so that the exhaust needs to be collected again as much as possible on the premise of ensuring the negative pressure of the system.
In order to ensure the negative pressure of the system, when the detected value of the second pressure sensor 28 is detected to be larger than the third pressure set value, the second electromagnetic valve 12 is closed, the first electromagnetic valve 11 is opened, and the pressure of the gaseous second cooling liquid in the second cooling liquid supply pipeline 2 is ensured to be smaller than the atmospheric pressure;
when the detected value of the second pressure sensor 28 is detected to be less than the fourth pressure set value, the first electromagnetic valve 11 is closed, and the second electromagnetic valve 12 is opened, so that the gaseous second cooling liquid which is not condensed in the main heat exchanger 3 and the auxiliary heat exchanger 6 is recovered into the system to be condensed.
It should be noted that the third pressure setting value may be 0.95bar, and the fourth pressure setting value may be 0.75bar, that is, when the detected value of the second pressure sensor 28 is detected to be > 0.95bar, the second electromagnetic valve 12 is closed, and the first electromagnetic valve 11 is opened; when the detection value of the second pressure sensor 28 is detected to be less than 0.75bar, the first electromagnetic valve 11 is closed, and the second electromagnetic valve 12 is opened.
Further, the method for controlling a self-circulation liquid cooling system in this embodiment further includes:
the first control valve 20 is used to control the supply flow of the first cooling liquid supply pipeline and then control the temperature of the second cooling liquid in the second cooling liquid outlet pipeline 5, and the specific control process is as follows:
when the detected value of the second temperature sensor 13 is detected to be larger than the third temperature set value, the opening degree of the first control valve 20 is increased;
when the detected value of the second temperature sensor 13 is smaller than the second temperature set value, the opening degree of the first control valve 20 is reduced;
the second temperature setting value may be 33 ℃, the third temperature setting value may be 37 ℃, the opening degree of the first control valve 20 may be increased when the detection value of the second temperature sensor 13 is greater than 37 ℃, and the opening degree of the first control valve 20 may be decreased when the detection value of the second temperature sensor 13 is less than 33 ℃. The opening degree of the first control valve 20 is controlled in real time by the temperature of the second cooling liquid in the second cooling liquid outlet pipe 5 sensed by the second temperature sensor 13, so that the temperature of the second cooling liquid in the second cooling liquid outlet pipe 5 is maintained within a reasonable temperature level range.
Calculating the dew point temperature in real time according to the detection value of the temperature and humidity sensor;
when detecting that the detection value of the second temperature sensor 13 > (dew point temperature + safety value + return difference), the opening degree of the first control valve 20 is increased;
when the detected value < (dew point temperature + safety value-return difference) of the second temperature sensor 13 is detected, the opening degree of the first control valve 20 is adjusted small.
The safety value is selected according to the actual operation condition of the system, and the return difference is determined according to the relevant detection instrument.
It should be noted that, by the above control method, the problem of condensation caused by too low temperature of the second cooling liquid in the second cooling liquid outlet pipeline 5 is prevented.
Further, the method for controlling a self-circulation liquid cooling system in this embodiment further includes:
the flow of the first coolant of the second liquid supply pipeline 18 is controlled by controlling the opening degree of the second control valve 29, so that the outflow temperature of the first coolant of the auxiliary heat exchanger 6 is equal to the outflow temperature of the first coolant of the main heat exchanger 3, thereby ensuring that the first coolant can perform sufficient heat exchange, and the specific control process is as follows:
when the detected detection value of the fifth temperature sensor 22 > (detection value of the fourth temperature sensor 23 + return difference), the opening degree of the second control valve 29 is increased;
when the detected value of the fifth temperature sensor 22 < (the detected value of the fourth temperature sensor 23 — the return difference), the opening degree of the second control valve 29 is adjusted smaller.
The return difference is set to 0.5 ℃, and the opening degree of the second control valve 29 is increased when the value detected by the fifth temperature sensor 22 is greater than the value detected by the fourth temperature sensor 23 +0.5 ℃, which is determined depending on the specific instrument. When the detection value of the fifth temperature sensor 22 is less than-0.5 ℃ which is the detection value of the fourth temperature sensor 23, the opening degree of the second control valve 29 is reduced.
While the self-circulation liquid cooling system and the control method thereof provided by the present invention have been described in detail, those skilled in the art will appreciate that the invention is not limited thereto, and that various modifications can be made to the system and method of the present invention without departing from the scope of the invention.
Claims (10)
1. A self-circulation liquid cooling system is characterized by comprising a main heat exchanger, an auxiliary heat exchanger, an equipment cooling pipeline, a liquid storage tank and a vacuum generating loop;
the main heat exchanger and the auxiliary heat exchanger both comprise a first loop and a second loop which are isolated from each other, and the first cooling liquid in the first loop is used for cooling the second cooling liquid in the second loop; the top of the main heat exchanger and the top of the auxiliary heat exchanger are both provided with a gaseous second cooling liquid outlet;
an outlet of the equipment cooling pipeline is connected with a second cooling liquid supply pipeline, an outlet of the second cooling liquid supply pipeline is connected with an inlet of a second loop of the main heat exchanger, an outlet of the second loop of the main heat exchanger is connected with the liquid storage tank, the liquid storage tank is positioned below the main heat exchanger, an outlet at the bottom of the liquid storage tank is connected with a second cooling liquid outlet pipeline, and an outlet of the second cooling liquid outlet pipeline is connected with an inlet of the equipment cooling pipeline;
the auxiliary heat exchanger is positioned above the main heat exchanger, and the vacuum generation loop comprises a first vacuum generation pipeline, a second vacuum generation pipeline, a vacuum pump and a first pressure sensor for detecting the pressure of an inlet of the vacuum pump;
the first port of the first vacuum generation pipeline is connected with the gaseous second cooling liquid outlet of the main heat exchanger, the second port of the first vacuum generation pipeline is connected with the inlet of the second loop of the auxiliary heat exchanger, the first pressure sensor and the vacuum pump are connected to the first vacuum generation pipeline, the gaseous second cooling liquid outlet of the auxiliary heat exchanger is connected with the first port of the second vacuum generation pipeline, the second port of the second vacuum generation pipeline is connected with the second cooling liquid supply pipeline, and the outlet of the second loop of the auxiliary heat exchanger is connected with the liquid storage tank.
2. The self-circulating liquid cooling system of claim 1, wherein a second pressure sensor and a first temperature sensor are further connected to the second coolant supply line;
the second pressure sensor is used for detecting the pressure of the second cooling liquid, and the first temperature sensor is used for detecting the temperature of the second cooling liquid;
the second vacuum generating pipeline is connected with an exhaust pipeline, the exhaust pipeline is provided with a first electromagnetic valve, the second vacuum generating pipeline is connected with a second electromagnetic valve, and the second electromagnetic valve is located between the exhaust pipeline and the second cooling liquid supply pipeline.
3. The self-circulating liquid cooling system of claim 1, wherein a second temperature sensor for detecting a temperature of the second cooling liquid is further connected to the second cooling liquid outlet line.
4. The self-circulating liquid cooling system of claim 3, comprising a liquid storage tower, a first cooling liquid supply line, a first liquid outlet line, a second liquid supply line, and a second liquid outlet line;
an inlet of the first cooling liquid supply pipeline is connected with an outlet of the liquid storage tower, and an inlet of the first liquid outlet pipeline and an inlet of the second liquid outlet pipeline are both connected with an outlet of the first cooling liquid supply pipeline;
an outlet of the first liquid supply pipeline is communicated with an inlet of a first loop of the main heat exchanger, an outlet of the first loop of the main heat exchanger is connected with an inlet of a first liquid outlet pipeline, and an outlet of the first liquid outlet pipeline is connected with an inlet of the liquid storage tower;
an outlet of the second liquid supply pipeline is communicated with an inlet of the first loop of the auxiliary heat exchanger, an outlet of the first loop of the auxiliary heat exchanger is connected with an inlet of the second liquid outlet pipeline, and an outlet of the second liquid outlet pipeline is connected with an inlet of the liquid storage tower;
the first cooling liquid supply pipeline is connected with a first control valve and a third temperature sensor for detecting the temperature of the first cooling liquid;
the second liquid supply pipeline is connected with a second control valve;
and the first liquid outlet pipeline is connected with a fourth temperature sensor for detecting the temperature of the first cooling liquid flowing out of the main heat exchanger, and the second liquid outlet pipeline is connected with a fifth temperature sensor for detecting the temperature of the first cooling liquid flowing out of the auxiliary heat exchanger.
5. The self-circulating liquid cooling system of claim 1, further comprising a third solenoid valve and a one-way valve;
an outlet of the second loop of the auxiliary heat exchanger is connected with the liquid storage tank through the third electromagnetic valve;
a low water level switch and a high water level switch are arranged in the auxiliary heat exchanger, and the high water level switch is positioned above the low water level switch;
and the outlet of the second loop of the main heat exchanger is connected with the liquid storage tank through the one-way valve.
6. A method for controlling a self-circulating liquid cooling system, the method being used for controlling the self-circulating liquid cooling system according to any one of claims 1 to 5, the method comprising:
when the detected value of the first pressure sensor is larger than a first pressure set value, starting a vacuum pump;
and when the detected value of the first pressure sensor is less than the second pressure set value, the vacuum pump is closed.
7. The method of claim 6, further comprising:
the control target of the vacuum pump is the inlet pressure of the vacuum pump, and the boiling point of second cooling liquid 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; and when the difference value between the boiling point and the detection value of the first temperature sensor is smaller than the first temperature set value, the control target value of the vacuum pump is increased until the difference value between the boiling point and the detection value of the first temperature sensor is larger than the first temperature set value.
8. The method of claim 6, further comprising:
when the detected value of the second pressure sensor is larger than a third pressure set value, closing the second electromagnetic valve and opening the first electromagnetic valve;
and when the detected value of the second pressure sensor is smaller than the fourth pressure set value, closing the first electromagnetic valve and opening the second electromagnetic valve.
9. The method of claim 6, further comprising:
the first control valve is used for controlling the supply flow of the first cooling liquid supply pipeline and then controlling the temperature of the second cooling liquid in the second cooling liquid outlet pipeline, and the specific control process is as follows:
when the detected value of the second temperature sensor is larger than a third temperature set value, the opening degree of the first control valve is increased;
when the detected value of the second temperature sensor is smaller than a second temperature set value, the opening degree of the first control valve is reduced;
or calculating the dew point temperature in real time according to the detection value of the temperature and humidity sensor;
when detecting that the detection value of the second temperature sensor is > (dew point temperature + safety value + return difference), increasing the opening degree of the first control valve;
when the detected value < (dew point temperature + safety value-return difference) of the second temperature sensor is detected, the opening degree of the first control valve is reduced.
10. The method of claim 6, further comprising:
the flow of the first cooling liquid of the second liquid supply pipeline is controlled by controlling the opening degree of the second control valve, so that the outflow temperature of the first cooling liquid of the auxiliary heat exchanger is equal to the outflow temperature of the first cooling liquid of the main heat exchanger, and the specific control process is as follows:
increasing the opening degree of the second control valve when the detected detection value of the fifth temperature sensor > (detection value of the fourth temperature sensor + return difference);
when the detected value of the fifth temperature sensor is < (the detected value of the fourth temperature sensor — the return difference), the opening degree of the second control valve is adjusted smaller.
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