Evaporative cooling system comprising an overhead pressure control mechanism and control method

Abstract

The application relates to the field of generator cooling, and particularly provides an evaporation cooling system comprising a top-mounted pressure control mechanism and a control method. The application aims to solve the problem that the evaporation cooling system is prone to self-sustained oscillation under the condition that the load of the generator suddenly increases or the cooling mechanism fails. To this end, the evaporation cooling system comprising the top-mounted pressure control mechanism is characterized in that the space of the pressure control body is divided into a pressure stabilizing space and a pressure control space, the size of the pressure stabilizing space is adjustable, and the pressure control space is connected with the exhaust side of the cooling mechanism. When the generator encounters load mutation or the cooling mechanism fails to cause gas accumulation, the exhaust side of the cooling mechanism enters the pressure control space through the first switching element, the size of the pressure control space can be adaptively adjusted according to the gas pressure of the exhaust side of the cooling mechanism, the gas pressure of the exhaust side of the cooling mechanism is reduced, the cooling effect of the stator bar is improved, the flow phase difference between the inlet and the outlet of the stator bar is reduced, and thus the self-sustained oscillation of the evaporation cooling system is avoided.

Description

Technical Field

[0001] This invention relates to the field of generator cooling, and specifically provides an evaporative cooling system and control method including a top-mounted pressure control mechanism. Background Technology

[0002] Evaporative cooling systems are widely used in generator cooling due to their high cooling efficiency, excellent insulation performance, low boiling point, and significant cost-effectiveness. This system efficiently removes heat from the generator's stator bars through the boiling process of the working fluid, achieving efficient cooling. However, due to the limited internal space and pressure regulation capabilities of evaporative cooling systems, the operating pressure can rise sharply when faced with a sudden increase in load or failure of the cooling mechanism, leading to an increase in the phase change temperature of the working fluid. This change, in turn, causes an increase in the stator bar temperature, reducing the length of the working fluid boiling zone within the bars, weakening the circulation power, and decreasing the flow rate at the stator bar inlet. Furthermore, due to the inertia of the working fluid, there is a time lag between the changes in the stator bar outlet flow rate and the inlet flow rate. When the outlet flow rate decreases, the system pressure and resistance decrease, the working fluid phase change temperature decreases, resulting in a decrease in the stator bar temperature and an increase in the inlet flow rate. This process repeats itself, resulting in a phase difference in the flow rate between the stator bar inlet and outlet. This phase difference leads to a phase difference between the system operating pressure and the circulating flow rate. This phase difference usually disappears slowly as the system state changes. However, when the phase difference stabilizes at a certain state, the system may form a self-sustaining oscillation, which may adversely affect the safe operation of the generator.

[0003] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0004] To address at least one problem in the prior art, namely, the tendency for evaporative cooling systems to experience self-sustaining oscillations under sudden load increases or cooling mechanism failures, this application provides an evaporative cooling system including a top-mounted pressure control mechanism, the evaporative cooling system comprising:

[0005] Cooling mechanism;

[0006] A top-mounted pressure control mechanism includes a pressure control body and a partition plate disposed within the pressure control body and dividing the space of the pressure control body into two independent pressure control spaces and a pressure stabilizing space. The partition plate is configured to move up and down according to the air pressure of the pressure control space and the pressure stabilizing space.

[0007] An exhaust mechanism, the exhaust mechanism including a first switching element, the first switching element being disposed on the intake side of the pressure control space and connected to the exhaust side of the cooling mechanism.

[0008] In the preferred embodiment of the above-mentioned evaporative cooling system, the exhaust mechanism further includes a second switching element, which is disposed on the exhaust side of the pressure control space.

[0009] In the preferred embodiment of the above-mentioned evaporative cooling system, the exhaust mechanism further includes a vacuum pump, which is connected to the second switching element.

[0010] In the preferred embodiment of the above-mentioned evaporative cooling system, the exhaust mechanism further includes a third switching element, which is disposed on the liquid discharge side of the pressure control space.

[0011] In the preferred embodiment of the above-mentioned evaporative cooling system, the third switching element is connected to the liquid inlet side of the cooling mechanism.

[0012] In the preferred embodiment of the above-mentioned evaporative cooling system, the top-mounted pressure control mechanism further includes a limiting structure, which is disposed in the pressure control space and configured to restrict the movement of the partition plate.

[0013] In the preferred embodiment of the above-mentioned evaporative cooling system, the cooling mechanism further includes a liquid return pipe, a liquid collecting ring pipe, a gas collecting ring pipe, a gas outlet pipe, a condenser, a connecting pipe, a pressure equalizing pipe, and a fourth switching element. The liquid return pipe, the liquid collecting ring pipe, the gas collecting ring pipe, the gas outlet pipe, the condenser, the connecting pipe, the pressure equalizing pipe, and the fourth switching element are connected in sequence. The pressure equalizing pipe is connected to the first switching element.

[0014] This application also provides a control method for an evaporative cooling system including a top-mounted pressure control mechanism. The evaporative cooling system includes a cooling mechanism, a top-mounted pressure control mechanism, and an exhaust mechanism. The top-mounted pressure control mechanism includes a pressure control body and a partition plate disposed within the pressure control body, dividing the space of the pressure control body into two independent pressure control spaces and a pressure stabilizing space. The partition plate is configured to move up and down according to the air pressure of the pressure control space and the pressure stabilizing space. The exhaust mechanism includes a first switching element disposed on the air inlet side of the pressure control space and connected to the exhaust side of the cooling mechanism. The control method includes:

[0015] The operating status of the generator is obtained, including the operating status and the intermittent stop status;

[0016] When the generator is in operation, the first switching element is controlled to remain in the open state.

[0017] In the preferred embodiment of the above control method, when the top-mounted pressure control mechanism further includes a second switching element disposed on the exhaust side of the pressure control space, the step of "controlling the first switching element to remain in the open state" also includes:

[0018] The second switching element is kept in the closed state.

[0019] In the preferred embodiment of the above control method, when the top-mounted pressure control mechanism further includes a third switching element disposed on the drain side of the pressure control space, the step of "controlling the first switching element to remain in the open state" also includes:

[0020] The third switching element is controlled to remain in the open state.

[0021] In a preferred embodiment of the above control method, the control method further includes:

[0022] When the generator is in a stop-and-intermittent state, the first current air pressure on the exhaust side of the cooling mechanism is obtained;

[0023] Compare the magnitude of the first current air pressure with the first preset air pressure;

[0024] When the first current air pressure is greater than or equal to the first preset air pressure, the exhaust mechanism is controlled to perform an exhaust operation.

[0025] In the preferred embodiment of the above control method, when the top-mounted pressure control mechanism further includes a second switching element disposed on the exhaust side of the pressure control space and a vacuum pump connected to the second switching element, the specific steps of "controlling the exhaust mechanism to perform exhaust operation" include:

[0026] When the first current air pressure is greater than or equal to the first preset air pressure, the first switching element is turned off, the second switching element is turned on, and the vacuum pump is controlled to start running.

[0027] Obtain the second current air pressure of the pressure control space;

[0028] Compare the second current air pressure with the second preset air pressure;

[0029] When the second current air pressure is less than the second preset air pressure, first turn off the second switching element and control the vacuum pump to stop working, and then turn on the first switching element.

[0030] In the preferred embodiment of the above control method, the step of "opening the first switching element" is followed by the following:

[0031] Next, the second current air pressure of the pressure control space is obtained;

[0032] Compare the second current air pressure with the third preset air pressure;

[0033] When the second current air pressure is greater than or equal to the third preset air pressure, the exhaust mechanism is controlled to perform the exhaust operation again;

[0034] The third preset air pressure is greater than the second preset air pressure.

[0035] In the preferred embodiment of the above control method, after the step of "controlling the exhaust mechanism to perform exhaust operation", the method further includes:

[0036] After the exhaust mechanism completes the exhaust operation, the cumulative number of exhaust operations is obtained.

[0037] Compare the cumulative number of exhaust cycles with the preset number of exhaust cycles;

[0038] When the cumulative number of exhausts is greater than or equal to the preset number of exhausts, the exhaust mechanism is controlled to stop the exhaust operation.

[0039] In the preferred embodiment of the above control method, after the step of "controlling the exhaust mechanism to perform exhaust operation", the method further includes:

[0040] After the exhaust mechanism completes the exhaust operation, the first current air pressure on the exhaust side of the cooling mechanism is obtained;

[0041] Compare the magnitude of the first current air pressure with the first preset air pressure;

[0042] When the first current air pressure is less than the first preset air pressure, the exhaust mechanism is controlled to stop the exhaust operation.

[0043] In the preferred embodiment of the above control method, after the step of "controlling the exhaust mechanism to perform exhaust operation", the method further includes:

[0044] After the exhaust mechanism completes the exhaust operation, it is determined that the generator is in a working state.

[0045] When the generator is in operation, the exhaust mechanism is controlled to stop the exhaust operation.

[0046] In the preferred embodiment of the above control method, the step of "controlling the exhaust mechanism to stop the exhaust operation" specifically includes:

[0047] The first switching element is turned on, the second switching element is turned off, and the vacuum pump is controlled to stop working.

[0048] In the preferred embodiment of the above control method, when the top-mounted pressure control mechanism further includes a third switching element disposed on the liquid discharge side of the pressure control body, the method further includes the following steps after "opening the first switching element, closing the second switching element, and controlling the vacuum pump to stop working":

[0049] Turn on the third switching element.

[0050] In the preferred embodiment of the above control method, when the top-mounted pressure control mechanism further includes a third switching element disposed on the liquid discharge side of the pressure control body, the steps of "closing the first switching element, opening the second switching element, and controlling the vacuum pump to start operation" are preceded by:

[0051] Close the third switching element; and

[0052] The step of “opening the first switching element” is followed by:

[0053] Turn on the third switching element.

[0054] Solution 1. An evaporative cooling system including a top-mounted pressure control mechanism, characterized in that the evaporative cooling system comprises:

[0055] Cooling mechanism;

[0056] A top-mounted pressure control mechanism includes a pressure control body and a partition plate disposed within the pressure control body and dividing the space of the pressure control body into two independent pressure control spaces and a pressure stabilizing space. The partition plate is configured to move up and down according to the air pressure of the pressure control space and the pressure stabilizing space.

[0057] An exhaust mechanism, the exhaust mechanism including a first switching element, the first switching element being disposed on the intake side of the pressure control space and connected to the exhaust side of the cooling mechanism.

[0058] Option 2. The evaporative cooling system according to Option 1, characterized in that the exhaust mechanism further includes a second switching element, the second switching element being disposed on the exhaust side of the pressure control space.

[0059] Option 3. The evaporative cooling system according to Option 2, characterized in that the exhaust mechanism further includes a vacuum pump, which is connected to the second switching element.

[0060] Option 4. The evaporative cooling system according to Option 1, characterized in that the exhaust mechanism further includes a third switching element, which is disposed on the liquid discharge side of the pressure control space.

[0061] Option 5. The evaporative cooling system according to Option 4, characterized in that the third switching element is connected to the liquid inlet side of the cooling mechanism.

[0062] Option 6. The evaporative cooling system according to Option 1, characterized in that the top-mounted pressure control mechanism further includes a limiting structure, the limiting structure being disposed in the pressure control space and configured to restrict the movement of the partition plate.

[0063] Option 7. The evaporative cooling system according to Option 1, characterized in that the cooling mechanism further includes a liquid return pipe, a liquid collecting ring pipe, a gas collecting ring pipe, a gas outlet pipe, a condenser, a connecting pipe, a pressure equalizing pipe, and a fourth switching element, wherein the liquid return pipe, the liquid collecting ring pipe, the gas collecting ring pipe, the gas outlet pipe, the condenser, the connecting pipe, the pressure equalizing pipe, and the fourth switching element are connected in sequence; the pressure equalizing pipe is connected to the first switching element.

[0064] Solution 8. A control method for an evaporative cooling system including a top-mounted pressure control mechanism, characterized in that the evaporative cooling system includes a cooling mechanism, a top-mounted pressure control mechanism, and an exhaust mechanism; the top-mounted pressure control mechanism includes a pressure control body and a partition plate disposed within the pressure control body and dividing the space of the pressure control body into two independent pressure control spaces and a pressure stabilizing space; the partition plate is configured to move up and down according to the air pressure of the pressure control space and the pressure stabilizing space; the exhaust mechanism includes a first switching element disposed on the air inlet side of the pressure control space and connected to the exhaust side of the cooling mechanism; the control method includes:

[0065] The operating status of the generator is obtained, including the operating status and the intermittent stop status;

[0066] When the generator is in operation, the first switching element is controlled to remain in the open state.

[0067] Solution 9. The control method according to Solution 8, characterized in that, when the top-mounted pressure control mechanism further includes a second switching element disposed on the exhaust side of the pressure control space, the step of "controlling the first switching element to remain in the open state" also includes:

[0068] The second switching element is kept in the closed state.

[0069] Solution 10. The control method according to Solution 8, characterized in that, when the top-mounted pressure control mechanism further includes a third switching element disposed on the drain side of the pressure control space, the step of "controlling the first switching element to remain in the open state" also includes:

[0070] The third switching element is controlled to remain in the open state.

[0071] Solution 11. The control method according to Solution 8, characterized in that the control method further includes:

[0072] When the generator is in a stop-and-intermittent state, the first current air pressure on the exhaust side of the cooling mechanism is obtained;

[0073] Compare the magnitude of the first current air pressure with the first preset air pressure;

[0074] When the first current air pressure is greater than or equal to the first preset air pressure, the exhaust mechanism is controlled to perform an exhaust operation.

[0075] Solution 12. The control method according to Solution 11, characterized in that, when the top-mounted pressure control mechanism further includes a second switching element disposed on the exhaust side of the pressure control space and a vacuum pump connected to the second switching element, the specific steps of "controlling the exhaust mechanism to perform exhaust operation" include:

[0076] When the first current air pressure is greater than or equal to the first preset air pressure, the first switching element is turned off, the second switching element is turned on, and the vacuum pump is controlled to start running.

[0077] Obtain the second current air pressure of the pressure control space;

[0078] Compare the second current air pressure with the second preset air pressure;

[0079] When the second current air pressure is less than the second preset air pressure, first turn off the second switching element and control the vacuum pump to stop working, and then turn on the first switching element.

[0080] Solution 13. The control method according to Solution 12, characterized in that, after the step of "opening the first switching element", it further includes;

[0081] Next, the second current air pressure of the pressure control space is obtained;

[0082] Compare the second current air pressure with the third preset air pressure;

[0083] When the second current air pressure is greater than or equal to the third preset air pressure, the exhaust mechanism is controlled to perform the exhaust operation again;

[0084] The third preset air pressure is greater than the second preset air pressure.

[0085] Solution 14. The control method according to Solution 13, characterized in that, after the step of "controlling the exhaust mechanism to perform the exhaust operation", it further includes:

[0086] After the exhaust mechanism completes the exhaust operation, the cumulative number of exhaust operations is obtained.

[0087] Compare the cumulative number of exhaust cycles with the preset number of exhaust cycles;

[0088] When the cumulative number of exhausts is greater than or equal to the preset number of exhausts, the exhaust mechanism is controlled to stop the exhaust operation.

[0089] Solution 15. The control method according to Solution 13, characterized in that, after the step of "controlling the exhaust mechanism to perform the exhaust operation", it further includes:

[0090] After the exhaust mechanism completes the exhaust operation, the first current air pressure on the exhaust side of the cooling mechanism is obtained;

[0091] Compare the magnitude of the first current air pressure with the first preset air pressure;

[0092] When the first current air pressure is less than the first preset air pressure, the exhaust mechanism is controlled to stop the exhaust operation.

[0093] Solution 16. The control method according to Solution 13, characterized in that, after the step of "controlling the exhaust mechanism to perform the exhaust operation", it further includes:

[0094] After the exhaust mechanism completes the exhaust operation, it is determined that the generator is in a working state.

[0095] When the generator is in operation, the exhaust mechanism is controlled to stop the exhaust operation.

[0096] Solution 17. The control method according to any one of Solutions 14-16, characterized in that the step of "controlling the exhaust mechanism to stop the exhaust operation" specifically includes:

[0097] The first switching element is turned on, the second switching element is turned off, and the vacuum pump is controlled to stop working.

[0098] Solution 18. The control method according to Solution 17, characterized in that, when the top-mounted pressure control mechanism further includes a third switching element disposed on the liquid discharge side of the pressure control body, after the steps of "opening the first switching element, closing the second switching element, and controlling the vacuum pump to stop working", the method further includes:

[0099] Turn on the third switching element.

[0100] Solution 19. The control method according to Solution 13, characterized in that, when the top-mounted pressure control mechanism further includes a third switching element disposed on the liquid discharge side of the pressure control body, the steps of "closing the first switching element, opening the second switching element, and controlling the vacuum pump to start operation" are preceded by:

[0101] Close the third switching element; and

[0102] The step of “opening the first switching element” is followed by:

[0103] Turn on the third switching element.

[0104] Those skilled in the art will understand that the evaporative cooling system of this application, which includes a top-mounted pressure control mechanism, divides the space of the pressure control body into an adjustable pressure stabilizing space and a pressure control space by setting a movable partition plate in the pressure control body. The pressure control space is connected to the exhaust side of the cooling mechanism, so that when the generator encounters a sudden load change or the cooling mechanism fails and causes gas accumulation, the exhaust side of the cooling mechanism can enter the pressure control space through the first switching element. Moreover, the size of the pressure control space can be adaptively adjusted according to the gas pressure on the exhaust side of the cooling mechanism, thereby effectively reducing the gas pressure on the exhaust side of the cooling mechanism, improving the cooling effect of the stator bars, reducing the flow phase difference between the inlet and outlet of the stator bars, thereby avoiding self-sustaining oscillation of the evaporative cooling system and ensuring the safe and stable operation of the generator.

[0105] Furthermore, by setting a second switching element on the exhaust side of the pressure control space, it is beneficial to discharge the gas in the pressure control space, thereby ensuring that the top-mounted pressure control mechanism can continue to effectively regulate the gas pressure on the exhaust side of the cooling mechanism in subsequent processes.

[0106] Furthermore, by connecting the second switching element to the vacuum pump, the low pressure state of the pressure control space is facilitated, thereby helping the gas on the exhaust side of the cooling mechanism to flow into the pressure control space.

[0107] Furthermore, by providing a third switching element on the liquid inlet side of the cooling mechanism, and connecting the third switching element to the liquid inlet side of the cooling mechanism, it is helpful to return the working fluid that enters the pressure control space with the gas to the cooling mechanism through the drain valve.

[0108] Furthermore, by setting a limiting structure within the pressure-controlled space, the movement range of the partition plate can be effectively limited, thereby ensuring the stability of the pressure-controlled space and the normal operation of the system.

[0109] Those skilled in the art will understand that the control method of the evaporative cooling system of this application controls the first switching element to remain open when the generator is in operation. This allows the gas to be automatically guided into the pressure control space when the generator encounters a sudden load change or when the cooling mechanism fails and gas accumulates. This effectively avoids a sudden increase in gas pressure on the exhaust side of the cooling mechanism, thereby ensuring the cooling effect of the stator bars, reducing the flow phase difference between the inlet and outlet of the stator bars, avoiding the risk of self-sustaining oscillation, and ensuring the stable and efficient operation of the generator.

[0110] Furthermore, by turning on the first switching element while turning off the second switching element, the working fluid that enters the pressure control space with the gas can be effectively prevented from flowing out from the exhaust side of the cooling mechanism, thereby saving the working fluid and avoiding waste.

[0111] Furthermore, by opening the third switching element at the same time as opening the first switching element, it is helpful for the working fluid that enters the control space with the gas to flow back from the drain side of the cooling mechanism to the cooling mechanism.

[0112] Furthermore, when the generator is in a stop-and-go state, closing the first switching element, opening the second switching element, and starting the vacuum pump when the first current gas pressure is greater than or equal to the first preset gas pressure helps to expel the non-condensable gas accumulated in the pressure-controlled space. When the second current gas pressure is less than the second preset gas pressure, closing the second switching element, stopping the vacuum pump, and opening the first switching element helps the gas on the exhaust side of the cooling mechanism enter the pressure-controlled space.

[0113] Furthermore, when the generator is in an intermittent shutdown state, the cumulative number of exhaust operations is obtained and compared with the preset number of exhaust operations. When the cumulative number of exhaust operations is greater than or equal to the preset number of exhaust operations, it indicates that the gas accumulated on the exhaust side of the cooling mechanism has been effectively discharged. At this time, controlling the exhaust mechanism to stop the exhaust operation can avoid resource waste. In other words, when the cumulative number of exhaust operations is less than the preset number of exhaust operations, controlling the exhaust mechanism to perform cyclic exhaust operations can effectively reduce the content of non-condensable gases in the cooling mechanism. Attached Figure Description

[0114] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0115] Figure 1 This is a system diagram of the evaporative cooling system of the present invention;

[0116] Figure 2 This is a flowchart of the control method for the evaporative cooling system of the present invention;

[0117] Figure 3 This is a logic diagram of a possible implementation of the control method for the evaporative cooling system of the present invention.

[0118] List of reference numerals in the attached diagram:

[0119] 1. Cooling mechanism; 101. Return pipe; 102. Liquid collecting ring pipe; 103. Gas collecting ring pipe; 104. Gas outlet pipe; 105. Condenser; 106. Connecting pipe; 107. Pressure equalizing pipe; 108. Second exhaust valve; 2. Top-mounted pressure control mechanism; 201. Pressure control space; 202. Pressure stabilizing space; 203. Limiting device; 204. Divider plate; 3. Exhaust mechanism; 301. Inlet valve; 302. Drain valve; 303. First exhaust valve; 304. Inlet pipe; 305. Drain pipe; 306. Exhaust pipe; 307. Vacuum pump; 4. Stator windings. Detailed Implementation

[0120] Preferred embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0121] It should be noted that in the description of this application, the terms "upper", "lower", "inner", "bottom", "end", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0122] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "set up," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0123] First refer to Figure 1 The evaporative cooling system of this application is described below.

[0124] To address the issue of self-sustaining oscillations in evaporative cooling systems under sudden load increases or failure of cooling mechanism 1, the evaporative cooling system of this application includes a cooling mechanism 1, a top-mounted pressure control mechanism 2, and an exhaust mechanism 3. The top-mounted pressure control mechanism 2 includes a pressure control body and a partition plate 204 disposed within the pressure control body, dividing the space of the body into two independent pressure control spaces 201 and pressure stabilizing spaces 202. The partition plate 204 is configured to move up and down according to the pressure difference between the pressure control spaces 201 and stabilizing spaces 202. The exhaust mechanism 3 includes a first switching element disposed on the intake side of the pressure control space 201 and connected to the exhaust side of the cooling mechanism 1.

[0125] This application divides the space of the pressure control body into a pressure stabilizing space 202 and a pressure control space 201 with adjustable size by setting a movable partition plate 204 in the pressure control body. The pressure control space 201 is connected to the exhaust side of the cooling mechanism 1, so that when the generator encounters a sudden load change or the cooling mechanism 1 fails and causes gas accumulation, the exhaust side of the cooling mechanism 1 can enter the pressure control space 201 through the first switching element. The size of the pressure control space 201 can be adaptively adjusted according to the gas pressure on the exhaust side of the cooling mechanism 1, thereby effectively avoiding a sudden increase in gas pressure on the exhaust side of the cooling mechanism 1, stabilizing the cooling effect of the stator bar 4, reducing the flow phase difference between the inlet and outlet of the stator bar, thereby avoiding self-sustaining oscillation of the evaporative cooling system and ensuring the safe and stable operation of the generator.

[0126] The following is further reference Figure 1 This paper describes a preferred embodiment of the evaporative cooling system of this application. Those skilled in the art will understand that the embodiments described below are merely illustrative of the principles of this application and are not intended to limit the scope of protection of this application. Provided that the evaporative cooling system includes at least a cooling mechanism 1, a top-mounted pressure control mechanism 2, and an exhaust mechanism 3, those skilled in the art can adjust the following configuration to make this application applicable to more specific application scenarios.

[0127] like Figure 1 As shown, the evaporative cooling system includes a cooling mechanism 1, a top-mounted pressure control mechanism 2, and an exhaust mechanism 3. The cooling mechanism 1 includes a return pipe 101, a liquid collecting ring pipe 102, a gas collecting ring pipe 103, an exhaust pipe 104, a condenser 105, a connecting pipe 106, a pressure equalization pipe 107, and a fourth switching element, connected in sequence. The fourth switching element is a second exhaust valve 108. In the above configuration, the liquid working fluid flows into the stator windings 4 through the return pipe 101 and the liquid collecting ring pipe 102. The liquid working fluid absorbs heat from the stator windings 4 and becomes a gas / gas-liquid two-phase working fluid, flowing out of the stator windings. It then flows through the gas collecting ring pipe 103 and the exhaust pipe 104 to the condenser 105, where it releases heat and becomes liquid again, entering the next cycle to cool the stator windings 4. During this process, the connecting pipe 106, the pressure equalization pipe 107, and the second exhaust valve 108 are used to exhaust the gas accumulated in the condenser 105.

[0128] It should be noted that the evaporative cooling system utilizes the boiling process of the working fluid to carry heat away from the stator wires. Since the condenser 105 is a crucial component for the working fluid to release heat and transform into a liquid phase, and the equalizing pipe 107 is connected to the condenser 105 and serves to balance the system pressure, non-condensable gases tend to accumulate there. The presence of these non-condensable gases reduces the heat dissipation efficiency of the cooling mechanism 1. Although a second exhaust valve 108 is designed in the cooling mechanism 1 to discharge non-condensable gases, it mainly functions during initial operation. Once the system is running stably, due to the continuous circulation of the working fluid, the second exhaust valve 108 cannot effectively and continuously discharge the non-condensable gases from the equalizing pipe 107, and the exhaust process may also waste the working fluid, thus affecting the performance of the cooling mechanism 1.

[0129] It should also be noted that this application does not limit the specific configuration of the second exhaust valve 108, as long as it can function to open or close. For example, the second exhaust valve 108 can be a second exhaust electric valve or a second exhaust solenoid valve.

[0130] It should also be noted that this application does not limit the number of condensers 105, as long as the gaseous working fluid can be converted into a liquid working fluid through the condenser 105. For example, the number of condensers 105 can be one, two, or other numbers. When there are two or more condensers 105, these condensers 105 are arranged in parallel and are all connected to the equalizing pipe 107 to ensure that if one condenser 105 fails, the other condensers 105 can still condense the gaseous working fluid.

[0131] See next Figure 1 The top-mounted pressure control mechanism 2 includes a pressure control body and a partition plate 204. The partition plate 204 is disposed within the pressure control body and divides the space of the body into two independent pressure control spaces 201 and pressure stabilizing spaces 202. The partition plate 204 can move up and down according to the air pressure in the pressure control spaces 201 and stabilizing spaces 202. Specifically, the pressure control space 201 is connected to the pressure equalization pipe 107, allowing gas in the pressure equalization pipe 107 to enter the pressure control space 201. As gas enters the pressure control space 201, the air pressure in the pressure control space 201 gradually increases. When the air pressure in the pressure control space 201 is greater than the air pressure in the pressure stabilizing space 202, the partition plate can move upward.

[0132] See next Figure 1The top-mounted pressure control mechanism 2 also includes a limiting structure 203, which is located within the pressure control space 201. The limiting structure 203 effectively restricts the movement range of the partition plate 204, thereby ensuring the stability of the pressure control space 201 and the normal operation of the system. Specifically, the limiting structure 203, located within the pressure control space 201, prevents the partition plate 204 from moving excessively due to pressure differences, thus avoiding excessive pressure fluctuations within the pressure control space 201.

[0133] It should be noted that this application does not limit the specific form of the limiting structure 203, as long as it can limit the movement range of the partition plate 204. For example, the limiting structure 203 can be a limiting block set on the inner wall of the pressure control space 201, and the limiting block can be set around the inner wall of the pressure control space 201.

[0134] See next Figure 1 The pressure control body, corresponding to the pressure control space 201, is equipped with an air inlet, an exhaust outlet, and a drain outlet. The exhaust mechanism 3 includes a first switching element, an air inlet pipe 304, a second switching element, an exhaust pipe 306, a third switching element, a drain pipe 305, and a vacuum pump 307. The first switching element is an air inlet valve 301, the second switching element is a first exhaust valve 303, and the third switching element is a drain valve 302. One end of the air inlet pipe 304 is connected to the air inlet, and the other end is connected to the exhaust side of the cooling mechanism 1. The equalizing pipe 107 serves as the exhaust side of the cooling mechanism 1, allowing gas within the equalizing pipe 107 to enter the pressure control space 201 through the air inlet pipe 304. An air inlet valve 301 is provided on the air inlet pipe 304, serving as the first switching element; the air inlet valve 301 can either open or close the connection between the cooling mechanism 1 and the pressure control space 201. One end of the exhaust pipe 306 is connected to the exhaust port, and the other end is connected to the vacuum pump 307. This allows the vacuum pump 307 to remove gas from the pressure-controlled space 201, maintaining a negative pressure state in the pressure-controlled space 201 and facilitating the entry of gas from the equalizing pipe 107 into the pressure-controlled space 201. A first exhaust valve 303 is installed on the exhaust pipe 306, serving as a second switching element. The first exhaust valve 303 controls the discharge of gas from the pressure-controlled space 201. One end of the drain pipe 305 is connected to the exhaust port, and the other end is connected to the return pipe 101 of the cooling mechanism 1. This effectively prevents the loss of working fluid carried by the gas entering the pressure-controlled space 201 and ensures that the liquid working fluid can smoothly return to the cooling mechanism 1 via the drain pipe 305. A drain valve 302 is installed on the drain pipe 305, serving as a third switching element. The drain valve 302 controls the flow of liquid working fluid within the pressure-controlled space 201.

[0135] It should be noted that this application does not limit the specific configuration of the intake valve 301, the first exhaust valve 303, and the drain valve 302, as long as they can function to open or close the circuit. For example, the intake valve 301 can be an intake electric valve or an intake solenoid valve. And / or, the first exhaust valve 303 can be a first exhaust electric valve or a first exhaust solenoid valve. And / or, the drain valve 302 can be a drain electric valve or a drain solenoid valve.

[0136] like Figure 2 As shown, based on the above configuration, the control method of the evaporative cooling system of this application includes:

[0137] S101. Obtain the operating status of the generator, which includes the working status and the stop / intermittent status;

[0138] S102. When the generator is in operation, the first switching element is kept in the open state.

[0139] It should be noted that when the generator is in operation, if there is a sudden increase in generator load or a failure of one of the parallel condensers 105 in the cooling mechanism 1, the gas in the equalizing pipe 107 increases, leading to a rise in gas pressure. By controlling the first switching element to remain open, gas in the cooling mechanism 1 can enter the pressure control space 201. As the gas pressure in the pressure control space 201 gradually increases, and when the gas pressure in the pressure control space 201 exceeds the gas pressure in the pressure stabilizing space 202, the partition plate 204 moves upward. This allows the top-mounted pressure control mechanism 2 to adaptively adjust the position of the partition plate 204 according to the gas pressure in the cooling mechanism 1, ensuring stable operation of the cooling mechanism 1 and preventing self-sustaining oscillations.

[0140] The preferred embodiments of the control method for the evaporative cooling system including the top-mounted pressure control mechanism of this application are described below.

[0141] In one embodiment, when the top-mounted pressure control mechanism further includes a second switching element disposed on the exhaust side of the pressure control space, the step of "controlling the first switching element to remain open" also includes: controlling the second switching element to remain closed.

[0142] For example, the first switching element is the intake valve 301, and the second switching element is the first exhaust valve 303. When the generator is in operation, the intake valve 301 is kept open while the first exhaust valve 303 is kept closed. This allows the gas from the exhaust side of the cooling mechanism 1 to enter the pressure control space 201 while preventing the working fluid entering the pressure control space with the gas from being lost through the first exhaust valve 303.

[0143] In one embodiment, when the top-mounted pressure control mechanism further includes a third switching element disposed on the drain side of the pressure control space, the step of "controlling the first switching element to remain in the open state" also includes:

[0144] The third switching element is kept in the open state.

[0145] For example, the first switching element is the intake valve 301, and the third switching element is the drain valve 302. When the generator is in operation, the intake valve 301 is kept open while the drain valve 302 is kept open, so that the gas from the exhaust side of the cooling mechanism 1 can enter the pressure control space 201, and the working fluid that enters the pressure control space 201 with the gas can flow back to the cooling mechanism 1 through the drain valve 302.

[0146] In one implementation, the control method further includes:

[0147] When the motor is in a stop-intermittent state, the first current air pressure on the exhaust side of the cooling mechanism 1 is obtained;

[0148] Compare the current air pressure with the first preset air pressure;

[0149] When the first current air pressure is greater than or equal to the first preset air pressure, the exhaust mechanism 3 is controlled to perform an exhaust operation.

[0150] For example, the equalizing pipe 107 is used as the exhaust side of the cooling mechanism 1. When the generator is in a stop-and-go state, the first current air pressure of the equalizing pipe 107 is obtained and compared with the first preset air pressure. When the first current air pressure is greater than or equal to the first preset air pressure, it indicates that the exhaust side air pressure of the cooling mechanism 1 is relatively high. At this time, the exhaust mechanism 3 is controlled to perform an exhaust operation.

[0151] Furthermore, when the top-mounted pressure control mechanism includes a second switching element disposed on the exhaust side of the pressure control space 201 and a vacuum pump 307 connected to the second switching element, the specific steps of the exhaust operation include:

[0152] When the first current air pressure is greater than or equal to the first preset air pressure, the first switching element is turned off and the second switching element is turned on, and the vacuum pump 307 is started to run.

[0153] Obtain the second current air pressure of the pressure control space 201;

[0154] Compare the second current air pressure with the second preset air pressure;

[0155] When the second current air pressure is less than the second preset air pressure, the second switching element is first turned off and the vacuum pump 307 is stopped working, and then the first switching element is turned on.

[0156] It should be noted that when a large amount of gas accumulates in the equalizing tube 107, in order to facilitate the introduction of the gas in the equalizing tube 107 into the top-mounted pressure control mechanism 2, the first switching element can be turned off and the second switching element turned on, while simultaneously controlling the vacuum pump 307 to start running, so that the pressure control space 201 is in a negative pressure state. When the second current gas pressure of the pressure control space 201 is less than the second preset gas pressure, it indicates that the gas pressure in the pressure control space 201 is low. At this time, the second switching element should be turned off and the vacuum pump 307 should be stopped working, and then the first switching element should be turned on to facilitate the gas in the equalizing tube 107 to enter the pressure control space 201.

[0157] For example, the first switching element is the intake valve 301, and the second switching element is the first exhaust valve 303. When the generator is in a stop-and-go state, the intake valve 301 is closed, the first exhaust valve 303 is opened, and the vacuum pump 307 is started simultaneously, which puts the pressure control space 201 into a negative pressure state. Then, the second current air pressure of the pressure control space 201 is obtained and compared with the second preset air pressure. When the second current air pressure is less than the second preset air pressure, it indicates that the air pressure of the pressure control space 201 is low. At this time, the first exhaust valve 303 is closed and the vacuum is stopped. Then, the intake valve 301 is opened to allow the gas in the equalizing pipe 107 to enter the pressure control space 201, thereby reducing the accumulation of gas in the cooling mechanism 1.

[0158] Furthermore, when the evaporative cooling system also includes a third switching element located on the drain side of the pressure control body, the steps of "closing the first switching element, opening the second switching element, and controlling the vacuum pump 307 to start operation" include the following:

[0159] Close the third switching element; and

[0160] The step of "opening the first switching element" also includes:

[0161] Turn on the third switching element.

[0162] For example, the first switching element is the inlet valve 301, the second switching element is the first exhaust valve 303, and the third switching element is the drain valve 302. Before closing the inlet valve 301, opening the first exhaust valve 303, and starting the vacuum pump 307, the drain valve 302 is closed to prevent the working fluid in the cooling mechanism 1 from entering the pressure control space 201 through the drain valve 302, which would affect the vacuum pumping effect of the vacuum pump 307. Furthermore, after opening the inlet valve 301, the drain valve 302 is opened to allow the working fluid that has entered the pressure control space 201 with the gas to flow back to the cooling mechanism 1 through the drain valve 302, thus avoiding waste of the working fluid.

[0163] Furthermore, the step of "opening the first switching element" also includes the following:

[0164] Next, obtain the second current air pressure of the pressure control space 201;

[0165] Compare the second current air pressure with the third preset air pressure;

[0166] When the second current air pressure is greater than or equal to the third preset air pressure, the exhaust mechanism is controlled to perform the exhaust operation again;

[0167] The third preset air pressure is greater than the second preset air pressure.

[0168] For example, the first switching element is the intake valve 301, the second switching element is the first exhaust valve 303, and the exhaust side of the cooling mechanism 1 is the equalizing pipe 107. When the first exhaust valve 303 is closed, the vacuum pump 307 stops working, and the intake valve 301 is opened, the gas in the pressure control space 201 gradually increases, and the gas pressure also increases accordingly. When the second current gas pressure in the pressure control space 201 is greater than or equal to the third preset gas pressure, it indicates that the pressure control space 201 is large enough and the gas pressure is relatively high. The gas in the equalizing pipe 107 flows slowly into the pressure control space 201. At this time, it is necessary to discharge the non-condensable gas in the pressure control space 201 to reduce the size and pressure of the pressure control space 201. Therefore, the exhaust mechanism 3 is controlled to perform the exhaust operation again.

[0169] In one embodiment, the step of "controlling the exhaust mechanism to perform the exhaust operation" is followed by:

[0170] After the exhaust mechanism completes the exhaust operation, the cumulative number of exhaust operations is obtained.

[0171] Compare the cumulative number of exhaust cycles with the preset number of exhaust cycles;

[0172] When the cumulative number of exhaust cycles is greater than or equal to the preset number of exhaust cycles, the exhaust mechanism is controlled to stop the exhaust operation.

[0173] It should be noted that in order to effectively reduce the content of non-condensable gases in the cooling mechanism, the exhaust mechanism needs to perform exhaust operations multiple times. By controlling the exhaust mechanism to perform multiple exhaust operations, the gas accumulated on the exhaust side of the cooling mechanism can be effectively discharged. At this point, controlling the exhaust mechanism to stop the exhaust operation can avoid wasting resources.

[0174] For example, after the exhaust mechanism completes the exhaust operation, the cumulative number of exhaust operations is recorded. When the cumulative number of exhaust operations is greater than or equal to the preset number of exhaust operations, it indicates that the gas accumulated on the exhaust side of the cooling mechanism has been effectively discharged, and the exhaust mechanism is stopped at this point. When the cumulative number of exhaust operations is less than the preset number of exhaust operations, it can be considered that the gas accumulated on the exhaust side of the cooling mechanism has not been effectively discharged. Therefore, controlling the exhaust mechanism to perform cyclical exhaust operations can effectively reduce the content of non-condensable gases in the cooling mechanism.

[0175] In one embodiment, the step of "controlling the exhaust mechanism to perform the exhaust operation" is followed by:

[0176] After the exhaust mechanism completes the exhaust operation, the first current air pressure on the exhaust side of the cooling mechanism is obtained;

[0177] Compare the current air pressure with the first preset air pressure;

[0178] When the first current air pressure is less than the first preset air pressure, the exhaust mechanism is controlled to stop the exhaust operation.

[0179] For example, after the exhaust mechanism completes the exhaust operation, the first current air pressure on the exhaust side of the cooling mechanism is obtained. When the first current air pressure is less than the first preset air pressure, it indicates that the gas accumulated on the exhaust side of the cooling mechanism has been effectively discharged, and the exhaust mechanism is stopped at this time. However, when the first current air pressure is greater than or equal to the first preset air pressure, it indicates that a large amount of gas has still accumulated on the exhaust side of the cooling mechanism. Therefore, controlling the exhaust mechanism to perform cyclic exhaust operations can effectively reduce the content of non-condensable gases in the cooling mechanism.

[0180] In one embodiment, the step of "controlling the exhaust mechanism to perform the exhaust operation" is followed by:

[0181] After the exhaust mechanism completes the exhaust operation, it is confirmed that the generator is in working condition.

[0182] When the generator is in operation, the exhaust mechanism is controlled to stop the exhaust operation.

[0183] It should be noted that the exhaust operation is only performed when the generator is in a stop-and-go state. When the generator is in operation, the exhaust mechanism needs to be controlled to stop the exhaust operation.

[0184] For example, after the exhaust mechanism completes the exhaust operation, the generator's operating status is obtained. When the generator is in operation, the exhaust mechanism is controlled to stop the exhaust operation. However, when the generator is in a stop-and-go state, the exhaust mechanism needs to be controlled to perform the exhaust operation cyclically, which can effectively reduce the content of non-condensable gases in the cooling system.

[0185] Furthermore, the steps for "controlling the exhaust mechanism to stop exhaust operation" specifically include:

[0186] The first switching element is turned on, the second switching element is turned off, and the vacuum pump is stopped.

[0187] For example, the first switching element is the intake valve, and the second switching element is the exhaust valve. When the cumulative number of exhaust operations is greater than or equal to the preset number of exhaust operations, or when the first current air pressure is less than the first preset air pressure, or when the generator is in operation, the intake valve is opened, the first exhaust valve is closed, and the vacuum pump is stopped, thereby stopping the exhaust operation of the exhaust mechanism.

[0188] Furthermore, when the top-mounted pressure control mechanism also includes a third switching element disposed on the drain side of the pressure control body, the steps following "opening the first switching element, closing the second switching element, and controlling the vacuum pump to stop working" further include:

[0189] Turn on the third switching element.

[0190] For example, the first switching element is the intake valve 301, the second switching element is the first exhaust valve 303, and the third switching element is the drain valve 302. After the intake valve 301 is opened, the first exhaust valve 303 is closed, and the vacuum pump 307 is stopped, the drain valve 302 is opened, allowing the working fluid in the pressure control space 201 to flow back to the cooling mechanism through the drain valve 302.

[0191] The following is combined Figure 3 This paper briefly describes one possible operating process of the control method for the evaporative cooling system of this application. Figure 3 This is a logic diagram of one possible implementation of the control method for the evaporative cooling system of this application.

[0192] S201. Obtain the generator's operating status, and then execute S202.

[0193] S202. Determine if the generator is in operation. If yes, proceed to S203; otherwise, proceed to S204.

[0194] S203. Open the intake valve 301 and the drain valve 302, and at the same time close the first exhaust valve 303.

[0195] S204. Obtain the first current air pressure in the equalizing tube 107, and then execute S205.

[0196] S205. Determine whether the first current air pressure is greater than or equal to the first preset air pressure. If yes, execute S206; otherwise, execute S212.

[0197] S206, close the intake valve 301 and the drain valve 302, open the first exhaust valve 303, and simultaneously control the vacuum pump 307 to start running, then execute S207.

[0198] S207. Obtain the second current air pressure of the pressure control space 201, and then execute S208.

[0199] S208. Determine whether the second current air pressure is less than the second preset air pressure. If yes, proceed to S209; otherwise, proceed to S207.

[0200] S209. First, close the first exhaust valve 303 and control the vacuum pump 307 to stop working. Then, open the intake valve 301 and finally open the drain valve 302. Then, execute S210.

[0201] S210: Obtain the cumulative number of exhaust operations, and then execute S211.

[0202] S211. Determine whether the cumulative number of exhaust cycles is greater than or equal to the preset number of exhaust cycles. If yes, proceed to S212; otherwise, proceed to S213.

[0203] S212. Open the intake valve 301 and the drain valve 302, close the first exhaust valve 303, and control the vacuum pump 307 to stop working.

[0204] S213. Next, obtain the generator's operating status, and then execute S214.

[0205] S214. Determine if the generator is in operation. If yes, execute S212; otherwise, execute S215.

[0206] S215. Obtain the first current air pressure on the exhaust side of the cooling mechanism 1, and then execute S216.

[0207] S216. Determine whether the first current air pressure is less than the first preset air pressure; if yes, execute S212, otherwise execute S217.

[0208] S217. Obtain the second current air pressure of the pressure control space 201, and then execute S218.

[0209] S218. Determine whether the second current air pressure is greater than or equal to the third preset air pressure. If yes, execute S206; otherwise, execute S210.

[0210] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0211] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. An evaporative cooling system including a top-mounted pressure control mechanism, characterized in that, The evaporative cooling system includes: Cooling mechanism; A top-mounted pressure control mechanism includes a pressure control body and a partition plate disposed within the pressure control body and dividing the space of the pressure control body into two independent pressure control spaces and a pressure stabilizing space. The partition plate is configured to move up and down according to the air pressure of the pressure control space and the pressure stabilizing space. The exhaust mechanism includes a first switching element, a second switching element, and a third switching element. The first switching element is disposed on the air intake side of the pressure control space and connected to the exhaust side of the cooling mechanism. The second switching element is disposed on the exhaust side of the pressure control space, and the third switching element is disposed on the liquid discharge side of the pressure control space.

2. The evaporative cooling system according to claim 1, characterized in that, The exhaust mechanism also includes a vacuum pump, which is connected to the second switching element.

3. The evaporative cooling system according to claim 1, characterized in that, The third switching element is connected to the liquid inlet side of the cooling mechanism.

4. The evaporative cooling system according to claim 1, characterized in that, The top-mounted pressure control mechanism also includes a limiting structure, which is disposed in the pressure control space and configured to restrict the movement of the partition plate.

5. The evaporative cooling system according to claim 1, characterized in that, The cooling mechanism further includes a return pipe, a liquid collecting ring pipe, a gas collecting ring pipe, a gas outlet pipe, a condenser, a connecting pipe, a pressure equalizing pipe, and a fourth switching element. The return pipe, the liquid collecting ring pipe, the gas collecting ring pipe, the gas outlet pipe, the condenser, the connecting pipe, the pressure equalizing pipe, and the fourth switching element are connected in sequence. The pressure equalizing pipe is connected to the first switching element.

6. A control method for an evaporative cooling system including a top-mounted pressure control mechanism as described in any one of claims 1-5, characterized in that, The evaporative cooling system includes a cooling mechanism, a top-mounted pressure control mechanism, and an exhaust mechanism. The top-mounted pressure control mechanism includes a pressure control body and a partition plate disposed within the pressure control body, dividing the space of the pressure control body into two independent pressure control spaces and a pressure stabilizing space. The partition plate is configured to move up and down according to the air pressure of the pressure control space and the pressure stabilizing space. The exhaust mechanism includes a first switching element disposed on the air inlet side of the pressure control space and connected to the exhaust side of the cooling mechanism. The control method includes: The operating status of the generator is obtained, including the operating status and the intermittent stop status; When the generator is in operation, the first switching element is controlled to remain in the open state.

7. The control method according to claim 6, characterized in that, When the top-mounted pressure control mechanism further includes a second switching element disposed on the exhaust side of the pressure control space, the step of "controlling the first switching element to remain in the open state" also includes: The second switching element is kept in the closed state.

8. The control method according to claim 6, characterized in that, When the top-mounted pressure control mechanism further includes a third switching element disposed on the drain side of the pressure control space, the step of "controlling the first switching element to remain in the open state" also includes: The third switching element is controlled to remain in the open state.

9. The control method according to claim 6, characterized in that, The control method further includes: When the generator is in a stop-and-intermittent state, the first current air pressure on the exhaust side of the cooling mechanism is obtained; Compare the magnitude of the first current air pressure with the first preset air pressure; When the first current air pressure is greater than or equal to the first preset air pressure, the exhaust mechanism is controlled to perform an exhaust operation.

10. The control method according to claim 9, characterized in that, When the top-mounted pressure control mechanism further includes a second switching element disposed on the exhaust side of the pressure control space and a vacuum pump connected to the second switching element, the specific steps for "controlling the exhaust mechanism to perform exhaust operation" include: When the first current air pressure is greater than or equal to the first preset air pressure, the first switching element is turned off, the second switching element is turned on, and the vacuum pump is controlled to start running. Obtain the second current air pressure of the pressure control space; Compare the second current air pressure with the second preset air pressure; When the second current air pressure is less than the second preset air pressure, first turn off the second switching element and control the vacuum pump to stop working, and then turn on the first switching element.

11. The control method according to claim 10, characterized in that, The step of "opening the first switching element" is followed by: Next, the second current air pressure of the pressure control space is obtained; Compare the second current air pressure with the third preset air pressure; When the second current air pressure is greater than or equal to the third preset air pressure, the exhaust mechanism is controlled to perform the exhaust operation again; The third preset air pressure is greater than the second preset air pressure.

12. The control method according to claim 11, characterized in that, The step of "controlling the exhaust mechanism to perform exhaust operations" is followed by: After the exhaust mechanism completes the exhaust operation, the cumulative number of exhaust operations is obtained. Compare the cumulative number of exhaust cycles with the preset number of exhaust cycles; When the cumulative number of exhausts is greater than or equal to the preset number of exhausts, the exhaust mechanism is controlled to stop the exhaust operation.

13. The control method according to claim 11, characterized in that, The step of "controlling the exhaust mechanism to perform exhaust operations" is followed by: After the exhaust mechanism completes the exhaust operation, the first current air pressure on the exhaust side of the cooling mechanism is obtained; Compare the magnitude of the first current air pressure with the first preset air pressure; When the first current air pressure is less than the first preset air pressure, the exhaust mechanism is controlled to stop the exhaust operation.

14. The control method according to claim 11, characterized in that, The step of "controlling the exhaust mechanism to perform exhaust operations" is followed by: After the exhaust mechanism completes the exhaust operation, it is determined that the generator is in a working state. When the generator is in operation, the exhaust mechanism is controlled to stop the exhaust operation.

15. The control method according to any one of claims 12-14, characterized in that, The steps of "controlling the exhaust mechanism to stop the exhaust operation" specifically include: The first switching element is turned on, the second switching element is turned off, and the vacuum pump is controlled to stop working.

16. The control method according to claim 15, characterized in that, When the top-mounted pressure control mechanism further includes a third switching element disposed on the liquid discharge side of the pressure control body, the following steps are added after the steps of "opening the first switching element, closing the second switching element, and controlling the vacuum pump to stop working": Turn on the third switching element.

17. The control method according to claim 11, characterized in that, When the top-mounted pressure control mechanism further includes a third switching element disposed on the liquid discharge side of the pressure control body, the steps of "closing the first switching element, opening the second switching element, and controlling the vacuum pump to start operation" include the following: Close the third switching element; and The step of "opening the first switching element" is followed by: Turn on the third switching element.

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