Heat dissipation system of generator set and control method of heat dissipation system

Abstract

The invention provides a heat dissipation system of a generator set and a control method of the heat dissipation system, and belongs to the technical field of water-cooling heat dissipation cooling liquid leakage detection of the generator set. A radiator is fixedly installed on one side of the generator body. A cooling liquid bin is fixedly mounted below the radiator; a vacuum pump is fixedly mounted above the side of the radiator; one side of the cooling liquid bin communicates with the radiator through a liquid outlet pipe; the top of the radiator communicates with a vacuum pump through a pipeline; the vacuum pump is communicated with the liquid injection surge bin through a pipeline; the liquid injection surge bin is communicated with the cooling liquid bin through a pipeline to form a closed loop; a liquid leakage detector is fixedly mounted on the liquid outlet pipe; the liquid leakage detector comprises a detector shell, a fixed contact and a movable contact; the top of the fixed contact and the top of the movable contact are fixedly installed on the detector shell, and the movable contact is an elastic piece. And the liquid leakage detector and the bubble sensor are electrically connected with the alarm through the controller.

Description

Technical Field

[0001] The present invention belongs to the technical field of water-cooled cooling liquid leakage detection for generator sets, and in particular, relates to a cooling system for a generator set and a control method thereof. Background Art

[0002] Diesel generators generate a lot of heat during operation, and this heat needs to be dissipated in time through the radiator to prevent the engine from overheating. The working principle of the diesel generator radiator is mainly to achieve heat exchange through the circulation of coolant and convection of air, thereby maintaining the normal operating temperature of the diesel generator.

[0003] The radiator is usually composed of coolant tubes and fins. The coolant circulates in the tubes and exchanges heat with the outside air through the fins, taking away the heat of the engine and dissipating it into the air. When the coolant passes through the engine, it absorbs the heat generated by the engine and brings it to the radiator. The radiator is usually composed of a series of small pipes and radiator fins. When the coolant passes through these pipes, it comes into contact with the radiator fins and transfers the heat to the fins. The coolant absorbs the high temperature inside the engine and dissipates the temperature through the fins. This process is repeated until the engine temperature stabilizes within a reasonable range.

[0004] At present, the power for the circulation of the radiator coolant is generated by a water pump, which is installed at the bottom of the generator. The diesel generator drives the water pump through a pulley. The water pump sprays the coolant into the heat exchange area and recovers the circulated coolant to complete the cycle.

[0005] Based on the analysis of the above background and prior art, the following questions are raised: Question 1: The existing technology uses a water pump to rotate at high speed to generate positive pressure, driving the coolant to circulate in a closed pipeline. When a leak occurs in the pipeline, the coolant will flow out of the leaking part to the outside of the system under the drive of the positive pressure. The coolant contains chemical components and will form crystals after drying. These crystals are flammable at high temperatures, and the engine heats up, which can easily cause a fire.

[0006] Question 2: After the coolant leaks, the remaining coolant used for heat exchange cannot effectively cool the generator, which will cause the engine to overheat. In severe cases, it may even cause cylinder seizure, resulting in engine deformation or damage.

[0007] Question 3: Existing technologies mostly use pressure sensors or pipeline flow sensors to detect the flow or pressure of the coolant during the transmission process, which indirectly reflects whether there is a coolant leak in the system. However, this detection method has relatively high requirements on sensor performance, and low-sensitivity sensors cannot sense relevant data in a timely manner; secondly, due to pumping, unless there is little coolant left in the entire circulation loop, this detection method is difficult to effectively perform the function of the sensor under the conventional coolant delivery method mentioned in the background, and cannot effectively detect coolant leaks and issue an alarm in a timely manner. Summary of the invention

[0008] In view of this, the present invention proposes a heat dissipation system for a generator set and a control method thereof, which can solve the problem that coolant will leak to the outside and cause danger when problems occur in the pipeline of the current generator heat dissipation system; and the problem that conventional coolant pumping methods cannot effectively avoid coolant leakage; at the same time, it solves the problem that whether leakage occurs during the current coolant transmission process cannot be effectively detected and corresponding reminders cannot be made.

[0009] The present invention is achieved in that: The present invention provides a heat dissipation system of a generator set, which comprises a generator body, a coolant tank and a vacuum pump; a radiator is fixedly installed on one side of the generator body; a coolant tank is fixedly installed below the radiator; a vacuum pump is fixedly installed on the upper side of the radiator; One side of the cooling liquid tank is connected to the radiator through a liquid outlet pipe; the top of the radiator is connected to the vacuum pump through a pipeline to form an internal circulation; The vacuum pump is connected to the liquid injection buffer tank through a pipeline; the liquid injection buffer tank is connected to the cooling liquid tank through a pipeline to form an external circulation; A liquid leakage detector is fixedly installed on the liquid outlet pipe; the liquid leakage detector includes a detector housing, a fixed contact and a live contact; the tops of the fixed contact and the live contact are fixedly installed on the detector housing, and the live contact is an elastic part; a bubble sensor is fixedly installed at the connection between the radiator and the liquid outlet pipe; the liquid leakage detector and the bubble sensor are electrically connected to the alarm through a controller.

[0010] The technical effect of the heat dissipation system of a generator set provided by the present invention is as follows: by arranging a vacuum pump on the upper side of the radiator, that is, the vacuum pump is located above the coolant tank, the suction of the vacuum pump is used to make the inner circulation part negative pressure and the outer circulation part flat pressure, and the coolant is circulated in the system by the pressure difference. At this time, even if the structure of the inner circulation part leaks, the negative pressure only sucks the external air into the system, and the internal coolant cannot leak to the outside of the system, thereby avoiding the combustion and fire caused by the leakage of the coolant; By setting the leakage detector inside the liquid outlet pipe, the impact force generated by the flow of coolant is used to make the live contact inside the leakage detector move closer to the fixed contact to form a closure; at this time, when coolant leaks at any position of the liquid outlet pipe, since the leakage position is connected to the atmosphere and the internal pressure is balanced, the vacuum pump cannot use negative pressure to suck the coolant in the coolant tank into the radiator through the liquid outlet pipe. At this time, the coolant between the leakage point and the vacuum pump flows in the opposite direction and flows back into the coolant tank. The impact force pushes the live contact to a position away from the fixed contact. At this time, the fixed contact and the live contact are disconnected, and the alarm sounds.

[0011] On the basis of the above technical solution, the heat dissipation system and control method of a generator set of the present invention can also be improved as follows: Furthermore, a reflux pipe is fixedly connected to one side of the cooling liquid tank; the reflux pipe is connected to the liquid return buffer tank; the liquid return buffer tank is connected to the liquid injection buffer tank through a pipeline; a liquid injection port is opened on the top of the liquid injection buffer tank; a screw cap is rotatably installed on the liquid injection port; and an air pressure balance pipe is also connected to one side of the liquid injection buffer tank.

[0012] The beneficial effects of adopting the above further solution are: by setting the liquid filling port, the coolant can be added to the coolant tank; by setting the screw cap, the liquid filling port can be sealed. Furthermore, a generator pulley is rotatably mounted on one side of the generator body; a pump pulley is rotatably mounted on one side of the vacuum pump; and the generator pulley is connected to the pump pulley via a belt drive.

[0013] The beneficial effect of adopting the above further solution is: by setting a belt, the generator body can synchronously drive the vacuum pump to work when it is working, thereby realizing the circulation of coolant in the coolant tank and completing refrigeration.

[0014] Furthermore, a heat exchange plate is fixedly installed at the bottom of the generator body; and the liquid outlet pipe is laid around the heat exchange plate.

[0015] Furthermore, an observation port is provided on one side of the coolant tank, a liquid level sensor is fixedly installed inside the coolant tank, and a scale is provided on the inner wall of the coolant tank away from the observation port; the liquid level sensor is electrically connected to the alarm through the controller.

[0016] The beneficial effects of adopting the above further scheme are: by setting up an observation port and a liquid level sensor, the amount of coolant inside the coolant tank is observed synchronously using the sensing equipment and the naked eye, and based on the change in the amount, it is indirectly reflected whether there is leakage in the entire system; when the liquid level drops to the threshold, the alarm sounds.

[0017] Furthermore, one end of the air pressure balance tube is fixedly installed on the top of the liquid injection port, the other end of the air pressure balance tube is connected to the atmosphere, and the opening of the other end of the air pressure balance tube is higher than the liquid injection port.

[0018] Furthermore, the liquid injection buffer tank, the liquid return buffer tank and the cooling liquid tank are all located outside the system.

[0019] The beneficial effect of adopting the above further solution is: by arranging the coolant tank, the return liquid buffer tank and the injection buffer tank outside the system, it is convenient for observation and maintenance.

[0020] The present invention also provides a control method for a heat dissipation system of a generator set, wherein a specific work flow and a corresponding control method include: S1 injects coolant into the circulation loop through the liquid injection port, and determines the injection amount through the observation port and the liquid level sensor; The S2 generator body starts, driving the generator pulley to rotate, and the pump pulley is driven to rotate through the belt. The pump pulley rotates to drive the vacuum pump to start, extracting the coolant inside the coolant tank to complete the internal circulation; The S3 vacuum pump cooperates with the liquid return buffer tank and the reflux pipe to return the coolant to the coolant tank to complete the external circulation; At this time, the specific control process is divided into two types: the system has coolant leakage and the system has no coolant leakage: There is no coolant leakage: The coolant in the coolant tank circulates under the action of the vacuum pump, and the flow impact impacts the active contact, causing the active contact to contact with the fixed contact. At this time, the leakage detector works normally and the system runs normally; Coolant leak: Coolant leaks anywhere in the internal circulation: The coolant above the leak point continues to move toward the vacuum pump, and the coolant below the leak point flows toward the coolant tank under the action of gravity; At this time, if the leakage point is located above the leakage detector, the active contact moves away from the fixed contact under the impact and elastic force of the coolant, the leakage detector works, and the alarm is controlled by the controller; At this time, if the leak point is located below the leak detector, until all the coolant passes through the leak detector, no coolant will flow subsequently. At this time, the active contact moves away from the fixed contact under the action of elastic force, and the leak detector controls the alarm through the controller to sound an alarm; When the leak is small, the vacuum pump drives the coolant to complete the internal circulation normally. During the extraction process, the outside air enters the internal circulation from the leak and moves with the coolant in the form of bubbles. At this time, the bubble sensor senses the bubbles and controls the alarm through the controller. Coolant leaks at any location in the external circulation: When the system is working normally, the coolant still completes the internal circulation to cool down the generator body; since the overall air pressure of the external circulation part is the same as the atmospheric pressure, any leakage is just seepage. At the same time, since the external circulation part is located outside the system, the seepage can be directly observed after it occurs; when the coolant in the coolant tank drops to the set threshold, the liquid level sensor controls the alarm through the controller.

[0021] Furthermore, the internal circulation includes: the generator pulley rotates, driving the pump pulley to rotate through the belt, causing the vacuum pump to start, pumping the coolant in the air pressure balance pipe into the radiator through the liquid outlet pipe, and pumping into the vacuum pump through the pump inlet; The external circulation includes: the vacuum pump discharges the coolant into the liquid injection buffer bin through the pump outlet, flows to the liquid return buffer bin by utilizing the height difference, and flows back to the coolant bin through the reflux pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 Indicates the overall structure Figure 1 ; Figure 2 Indicates the overall structure Figure 2 ; Figure 3 for Figure 1 A magnified view of point A; Figure 4 It is the process diagram of the internal circulation of the coolant; Figure 5 This is the process diagram of the coolant external circulation; In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Generator body; 11. Generator pulley; 2. Coolant tank; 21. Observation port; 22. Liquid outlet pipe; 23. Liquid return buffer tank; 24. Reflux pipe; 25. Air pressure balance pipe; 26. Screw cap; 27. Liquid injection port; 28. Liquid injection buffer tank; 3. Vacuum pump; 31. Pump pulley; 32. Pump liquid outlet; 33. Pump liquid inlet; 4. Radiator; 5. Heat exchange plate; 6. Belt; 7. Liquid leakage detector; 71. Detector housing; 72. Fixed contact; 73. Live contact. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] like Figure 1-5 As shown, the present invention provides a heat dissipation system for a generator set, which includes a generator body 1, a coolant tank 2 and a vacuum pump 3; a radiator 4 is fixedly installed on one side of the generator body 1; a coolant tank 2 is fixedly installed below the radiator 4; a vacuum pump 3 is fixedly installed on the upper side of the radiator 4; the bottom of one side of the coolant tank 2 is fixedly connected to one end of a liquid outlet pipe 22; the other end of the liquid outlet pipe 22 is fixedly connected to the bottom of the radiator 4; the top of the radiator 4 is connected to a pump liquid inlet 33 through a pipeline; the pump liquid inlet 33 is arranged below the vacuum pump 3, and a pump liquid outlet 32 ​​is arranged above the vacuum pump 3, and the pump liquid outlet 32 is connected with the liquid injection buffer tank 28 through a connecting pipe; the liquid injection buffer tank 28 is connected with the cooling liquid tank 2 through a connecting pipe to form a closed loop; a liquid leakage detector 7 is fixedly installed on the liquid outlet pipe 22; the liquid leakage detector 7 includes a detector housing 71, a fixed contact 72 and a live contact 73; the tops of the fixed contact 72 and the live contact 73 are fixedly installed on the detector housing 71, and the lower parts of the fixed contact 72 and the live contact 73 are located in the liquid outlet pipe 22; a bubble sensor is fixedly installed inside the connection position of the liquid outlet pipe 22 of the radiator 4; the bubble sensor and the liquid leakage detector 7 are electrically connected to the alarm through the controller.

[0026] Optionally, in the above technical solution, one end of a reflux pipe 24 is fixedly connected to the top of the cooling liquid tank 2 away from the liquid outlet pipe 22; the other end of the reflux pipe 24 is fixedly connected to the bottom of the liquid return buffer tank 23; the top of the liquid return buffer tank 23 is connected to the bottom of the liquid injection buffer tank 28 through a pipeline; a liquid injection port 27 is opened at the top of the liquid injection buffer tank 28; a screw cap 26 is rotatably installed in the liquid injection port 27; and an air pressure balance pipe 25 is also fixedly installed on one side of the liquid injection buffer tank 28.

[0027] Optionally, in the above technical solution, a generator pulley 11 is rotatably installed on the side of the generator body 1 close to the radiator 4; a pump pulley 31 is rotatably installed on the side of the vacuum pump 3 away from the radiator 4; the generator pulley 11 and the pump pulley 31 are connected through a belt 6.

[0028] Optionally, in the above technical solution, a heat exchange plate 5 is fixedly installed at the bottom of the generator body 1 ; and the liquid outlet pipe 22 is laid around the heat exchange plate 5 .

[0029] Optionally, in the above technical solution, an observation port 21 is opened on one side of the coolant tank 2, and a liquid level sensor for measuring the amount of coolant inside the coolant tank 2 is fixedly installed inside the coolant tank 2, and a scale is set on the inner wall of the coolant tank 2 away from the observation port 21; the liquid level sensor is electrically connected to the alarm through the controller.

[0030] Optionally, in the above technical solution, one end of the air pressure balance tube 25 is fixedly installed on the top of the liquid injection port 27, the other end of the air pressure balance tube 25 is connected to the atmosphere, and the opening of the other end of the air pressure balance tube 25 is higher than the liquid injection port 27.

[0031] Optionally, in the above technical solution, the liquid injection buffer tank 28, the liquid return buffer tank 23 and the cooling liquid tank 2 are all located at the outermost part of the system.

[0032] The present invention provides a control method for a heat dissipation system of a generator set, characterized in that a specific work flow and a corresponding control method include: S1 injects coolant into the circulation loop through the injection port 27, and determines the amount of injection through the observation port 21 and the liquid level sensor; S2 The generator body 1 starts, and at the same time drives the vacuum pump 3 to start, extracting the coolant inside the coolant tank 2 to complete the internal circulation; S3 vacuum pump 3 cooperates with liquid return buffer tank 23 and reflux pipe 24 to return the coolant to the coolant tank 2 to complete the external circulation; At this time, the specific control process is divided into two types: the system has coolant leakage and the system has no coolant leakage: There is no coolant leakage: The coolant in the coolant tank 2 circulates under the action of the vacuum pump 3, and the flow impact impacts the active contact 73, causing the active contact 73 to contact the fixed contact 72. At this time, the leakage detector 7 works normally and the system operates normally. Coolant leak: The coolant leaks at any position in the internal circulation: the coolant above the leaking point continues to move toward the vacuum pump 3, and the coolant below the leaking point flows toward the coolant tank 2 under the action of gravity; at this time, if the leaking point is located above the leak detector 7, the active contact 73 moves away from the fixed contact 72 under the action of the impact and elastic force of the coolant, the leak detector 7 works, and the controller controls the alarm to sound an alarm; at this time, if the leaking point is located below the leak detector 7, until all the coolant passes through the leak detector 7, no coolant flows thereafter, at this time the active contact 73 moves away from the fixed contact 72 under the action of the elastic force, and the leak detector 7 controls the alarm to sound an alarm through the controller; When the leakage position is small, the vacuum pump 3 drives the coolant to complete the internal circulation normally. During the extraction process, the outside air enters the internal circulation from the leakage and moves with the coolant in the form of bubbles. At this time, the bubble sensor senses the bubbles and controls the alarm to sound through the controller. Coolant leaks at any position in the external circulation: When the system works normally, the coolant still completes the internal circulation to cool the generator body 1; since the overall air pressure of the external circulation part is the same as the atmospheric pressure, leakage is just seepage, and since the external circulation part is located outside the system, it can be directly observed after the seepage occurs; when the coolant in the coolant tank 2 drops to the set threshold, the liquid level sensor controls the alarm through the controller.

[0033] Optional, such as Figure 4 , 5 As shown, in the above technical solution, the internal circulation includes: the generator pulley 11 rotates, driving the pump pulley 31 to rotate through the belt 6, so that the vacuum pump 3 is started, and the coolant in the air pressure balance pipe 25 is pumped into the radiator 4 through the liquid outlet pipe 22 and into the vacuum pump 3 through the pump inlet 33; The external circulation includes: the vacuum pump 3 discharges the coolant into the liquid injection buffer tank 28 through the pump outlet 32, and the coolant flows to the liquid return buffer tank 23 by utilizing the height difference and flows back to the coolant tank 2 through the reflux pipe 24.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat dissipation system for a generator set, characterized in that: It comprises a generator body (1), a coolant tank (2) and a vacuum pump (3); A radiator (4) is fixedly mounted on one side of the generator body (1); a coolant tank (2) is fixedly mounted below the radiator (4); and a vacuum pump (3) is fixedly mounted above the side of the radiator (4); One side of the cooling liquid tank (2) is connected to the radiator (4) via a liquid outlet pipe (22); the top of the radiator (4) is connected to the vacuum pump (3) via a pipeline to form an internal circulation; The vacuum pump (3) is connected to the liquid injection buffer tank (28) through a pipeline; the liquid injection buffer tank (28) is connected to the cooling liquid tank (2) through a pipeline to form an external circulation; A liquid leakage detector (7) is fixedly mounted on the liquid outlet pipe (22); the liquid leakage detector (7) comprises a detector housing (71), a fixed contact (72) and a movable contact (73); the tops of the fixed contact (72) and the movable contact (73) are fixedly mounted on the detector housing (71), and the movable contact (73) is an elastic member; A bubble sensor is fixedly installed at the connection between the radiator (4) and the liquid outlet pipe (22); the liquid leakage detector (7) and the bubble sensor are electrically connected to an alarm via a controller.

2. A heat dissipation system for a generator set according to claim 1, characterized in that: A return pipe (24) is fixedly connected to one side of the cooling liquid tank (2); the return pipe (24) is connected to the return liquid buffer tank (23); the return liquid buffer tank (23) is connected to the injection buffer tank (28) through a pipeline; a liquid injection port (27) is provided on the top of the injection buffer tank (28); a rotary cap (26) is rotatably installed on the injection port (27); and a gas pressure balance pipe (25) is also connected to one side of the injection buffer tank (28).

3. A heat dissipation system for a generator set according to claim 1, characterized in that: A generator pulley (11) is rotatably mounted on one side of the generator body (1); a pump pulley (31) is rotatably mounted on one side of the vacuum pump (3); the generator pulley (11) and the pump pulley (31) are connected to each other via a belt (6).

4. A heat dissipation system for a generator set according to claim 1, characterized in that: A heat exchange plate (5) is fixedly mounted on the bottom of the generator body (1); the liquid outlet pipe (22) is laid around the heat exchange plate (5).

5. The heat dissipation system of a generator set according to claim 2, characterized in that: An observation port (21) is provided on one side of the coolant tank (2); a liquid level sensor is fixedly installed inside the coolant tank (2); and a scale is provided on the inner wall of the coolant tank (2) away from the observation port (21); the liquid level sensor is electrically connected to the alarm through the controller.

6. A heat dissipation system for a generator set according to claim 2, characterized in that: One end of the air pressure balance pipe (25) is fixedly mounted on the top of the liquid injection port (27), the other end of the air pressure balance pipe (25) is connected to the atmosphere, and the opening of the other end of the air pressure balance pipe (25) is higher than the liquid injection port (27).

7. A heat dissipation system for a generator set according to claim 2, characterized in that: The liquid injection buffer tank (28), the liquid return buffer tank (23) and the cooling liquid tank (2) are all located outside the system.

8. A method for controlling a heat dissipation system of a generator set, characterized in that: The specific work flow and corresponding control methods include: S1 injects coolant into the circulation loop through the injection port (27), and determines the injection amount through the observation port (21) and the liquid level sensor; The S2 generator body (1) is started, driving the generator pulley (11) to rotate, and driving the pump pulley (31) to rotate through the belt (6). The pump pulley (31) rotates to drive the vacuum pump (3) to start, and the coolant in the coolant tank (2) is extracted to complete the internal circulation; The S3 vacuum pump (3) cooperates with the liquid return buffer tank (23) and the return pipe (24) to return the coolant to the coolant tank (2), completing the external circulation; At this time, the specific control process is divided into two types: the system has coolant leakage and the system has no coolant leakage: There is no coolant leakage: The coolant in the coolant tank (2) circulates under the action of the vacuum pump (3), and the flow impact impacts the active contact (73) so that the active contact (73) contacts the fixed contact (72). At this time, the leakage detector (7) works normally and the system operates normally. Coolant leak: When the coolant leaks at any position in the internal circulation, the coolant above the leaking point continues to move toward the vacuum pump (3), and the coolant below the leaking point flows toward the coolant tank (2) under the action of gravity. When the leaking point is located above the leak detector (7), the active contact (73) moves away from the fixed contact (72) under the action of the impact and elastic force of the coolant, and the leak detector (7) works, and the controller controls the alarm to sound an alarm. When the leaking point is located below the leak detector (7), until all the coolant passes through the leak detector (7), no coolant flows thereafter, and at this time, the active contact (73) moves away from the fixed contact (72) under the action of the elastic force, and the leak detector (7) controls the alarm to sound an alarm through the controller. When the leakage position is small, the vacuum pump (3) normally drives the coolant to complete the internal circulation; during the extraction process, the outside air enters the internal circulation from the leakage and moves with the coolant in the form of bubbles. At this time, the bubble sensor senses the bubbles and controls the alarm to sound through the controller; Coolant leaks at any position in the external circulation: the system works normally, and the coolant still completes the internal circulation to cool down the generator body (1); since the overall air pressure of the external circulation part is the same as the atmospheric pressure, leakage is only seepage, and since the external circulation part is located outside the system, it can be directly observed after the seepage occurs; when the coolant in the coolant tank (2) drops to the set threshold, the liquid level sensor controls the alarm through the controller to sound an alarm.

9. A method for controlling a heat dissipation system of a generator set according to claim 8, characterized in that: The internal circulation includes: the generator pulley (11) rotates, driving the pump pulley (31) to rotate through the belt (6), so that the vacuum pump (3) starts, and the coolant in the air pressure balance pipe (25) is pumped into the radiator (4) through the liquid outlet pipe (22), and then pumped into the vacuum pump (3) through the pump liquid inlet (33); The external circulation includes: the vacuum pump (3) discharges the cooling liquid into the liquid injection buffer bin (28) through the pump outlet (32), flows to the liquid return buffer bin (23) by utilizing the height difference, and flows back into the cooling liquid bin (2) through the return pipe (24).

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