Liquid level control device and method for gas-water separator of magnetic suspension vacuum pump

Abstract

The invention belongs to the technical field of liquid level control devices, and relates to a liquid level control device for a gas-water separator of a magnetic suspension vacuum pump, which comprises a gas-water separator, a liquid level detection assembly is arranged in the gas-water separator, and the liquid level detection assembly is used for detecting the lowest liquid level, the highest liquid level and the safe liquid level in the gas-water separator. A liquid discharging opening is formed in the lower portion of the gas-water separator, a liquid discharging assembly is communicated with the liquid discharging opening, the liquid discharging assembly and the liquid level detection assembly are electrically connected with a main controller, the main controller periodically adjusts the liquid discharging amount of the liquid discharging assembly according to the height of the liquid level in the gas-water separator, and then the liquid level in the gas-water separator is kept below the lowest liquid level; sewage is periodically discharged according to water level changes, and it is guaranteed that the water level in the gas-water separator is kept below the safe water level.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid level control devices, and in particular, relates to a liquid level control device for a gas-water separator of a magnetic suspension vacuum pump and a method thereof. Background Art

[0002] Compared with traditional water ring vacuum pumps, magnetic levitation vacuum pumps have the advantages of high efficiency and energy saving, fast response, strong stability, low noise and easy maintenance. They can be widely used in chemical, thermal power, food and other industries. However, complex working environments may cause damage to the equipment, reduced work efficiency and shortened life. For example, fiber impurities may affect the stable suspension of the rotor, corrosive raw materials may shorten the life of the impeller, complex gas-liquid composition may cause scaling inside the equipment, and large fluctuations in the gas-liquid ratio may cause surge shutdown.

[0003] Therefore, it is necessary to install an air-water separator in front of the magnetic levitation vacuum pump to filter out fiber impurities in complex gases and optimize the impeller environment. When the air-water separator filters the gas, impurity precipitation and sewage will continue to be generated and accumulated in the air-water separator. If it is not discharged in time, sewage will overflow and cause equipment damage. If the sewage outlet is always open, gas will leak from the sewage outlet after the sewage is drained. Therefore, it is necessary to adjust the sewage discharge according to the water level changes.

[0004] There are various structures of existing gas-water separators. For example, the patent application number is: CN202222829750.2; a gas-water separation device for a magnetic levitation vacuum pump is disclosed, including a cylinder, an air inlet is arranged on the top of the cylinder, an air outlet is arranged on one side of the cylinder, a spray component for spraying water mist to intercept dust in the air is arranged in the cylinder below the air inlet, and an interception component for intercepting moisture in the air is arranged at the position of the air outlet in the cylinder.

[0005] The above-mentioned existing gas-water separator can filter dust and water vapor in the air, and then transport them to the magnetic levitation vacuum pump to prevent water vapor from entering the magnetic levitation vacuum pump, and a liquid level gauge is installed in the water accumulation chamber, which is used to detect the liquid level of wastewater in the water collection chamber; a filtrate pump is also provided, and the filtrate pump is used to suck the liquid in the water collection chamber to transport the liquid in the water collection chamber to the outside, thereby realizing the automatic water discharge function; however, the liquid level detection probes used in this type of existing gas-water separator are all fixed in position and simple as a whole. After reaching the water level value, the filtrate pump is turned on for natural drainage, and the water level cannot be adjusted in real time. If the water level is too high or the water level surges, the water cannot be drained quickly and effectively, and it can only be drained naturally according to the water pressure, and the water level cannot be quickly lowered to a safe position, and the required water level cannot be adjusted according to actual needs, thereby reducing the use effect. Summary of the invention

[0006] The main technical problem to be solved by the present invention is to provide a liquid level control device and method for the gas-water separator of a magnetic levitation vacuum pump, which can periodically discharge sewage according to water level changes without affecting the normal operation of the equipment, thereby ensuring that the water level in the gas-water separator remains below the safe water level; and can control the drainage speed according to the water level height to avoid a surge in the water level and the inability to drain water quickly and effectively, thereby improving the use effect.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: A liquid level control device for a gas-water separator of a magnetic levitation vacuum pump comprises a gas-water separator, wherein a liquid level detection component is arranged in the gas-water separator, the liquid level detection component is used to detect the lowest liquid level, the highest liquid level and the safe liquid level in the gas-water separator, a liquid discharge port is arranged below the gas-water separator, a liquid discharge port is connected with a liquid discharge component, the liquid discharge component and the liquid level detection component are electrically connected with a main controller respectively, and the main controller periodically adjusts the liquid discharge amount of the liquid discharge component according to the height of the liquid level in the gas-water separator, thereby maintaining the liquid level in the gas-water separator below the lowest liquid level.

[0008] The following is a further optimization of the above technical solution by the present invention: The liquid level detection component includes a lower limit liquid level detection sensor, an upper limit liquid level detection sensor and a safety liquid level detection sensor; the output ends of the lower limit liquid level detection sensor, the upper limit liquid level detection sensor and the safety liquid level detection sensor are electrically connected to the input end of the main controller respectively, and the real-time liquid level signals detected by the lower limit liquid level detection sensor, the upper limit liquid level detection sensor and the safety liquid level detection sensor are sent to the main controller.

[0009] Further optimization: the lower limit liquid level detection sensor is arranged in the gas-water separator at the lowest liquid level, the upper limit liquid level detection sensor is arranged above the lower limit liquid level detection sensor, and the upper limit liquid level detection sensor and the lower limit liquid level detection sensor are arranged at a certain distance.

[0010] Further optimization: the lower limit liquid level detection sensor is used to detect the lowest liquid level in the gas-water separator, and the upper limit liquid level detection sensor is used to detect the highest liquid level in the gas-water separator; the main controller delays the control of the drainage component to start according to the detection signal of the lower limit liquid level detection sensor or the upper limit liquid level detection sensor, so that the liquid level in the gas-water separator is maintained below the lowest liquid level.

[0011] Further optimization: the safety liquid level detection sensor is arranged in the gas-water separator and is located above the high-limit liquid level detection sensor. The safety liquid level detection sensor and the high-limit liquid level detection sensor are arranged at a certain distance; the safety liquid level detection sensor is used to detect whether the liquid level in the gas-water separator reaches the safety liquid level. The safety liquid level is also the limit liquid level for the operation of the gas-water separator.

[0012] Further optimization: the drainage component includes a first filtrate pump and a second filtrate pump, and the water inlets of the first filtrate pump and the second filtrate pump are connected to the drainage port of the gas-water separator through a connecting pipeline.

[0013] Further optimization: the control ends of the first filtrate pump and the second filtrate pump are electrically connected to the signal output end of the main controller, and the main controller outputs a control signal for independently controlling the first filtrate pump and the second filtrate pump to start and perform drainage operations.

[0014] Further optimization: the connecting pipeline includes a drainage main pipe, which is installed on the drainage port of the gas-water separator. The other end of the drainage main pipe is connected to a drainage branch pipe, and the drainage branch pipe and the drainage main pipe are arranged vertically; the first filtrate pump and the second filtrate pump are respectively connected to the two ends of the drainage branch pipe.

[0015] Further optimization: the gas outlet of the gas-water separator is connected to a magnetic levitation vacuum pump, and the output end and input end of the main controller are electrically connected to the control end and signal output end of the magnetic levitation vacuum pump respectively.

[0016] The present invention also provides a liquid level control method for a gas-water separator of a magnetic levitation vacuum pump. Based on the liquid level control device for a gas-water separator of a magnetic levitation vacuum pump, the control method includes an automatic mode and a manual mode, wherein the automatic mode is performed according to the following steps: Step 1: The lower limit liquid level detection sensor, the upper limit liquid level detection sensor and the safety liquid level detection sensor are sequentially arranged at different heights in the gas-water separator in order from low to high; Step 2: When the water level in the gas-water separator reaches the position of the lower limit liquid level detection sensor, the lower limit liquid level detection sensor feeds back the liquid level detection information to the main controller, and the main controller issues a control command after a delay of seconds to control the first filtrate pump to start working and discharge the sewage in the gas-water separator; when the water level in the gas-water separator drops below the lower limit liquid level detection sensor, the lower limit liquid level detection sensor transmits the liquid level detection information to the main controller, and the main controller issues a control command after a delay of seconds to control the first filtrate pump to shut down; Step 3: After the first filtrate pump is started, the water level in the gas-water separator continues to rise. When the water level reaches the position of the upper limit liquid level detection sensor, the upper limit liquid level detection sensor feeds back the liquid level detection information to the main controller. The main controller issues a control command after a delay of seconds to control the start of the second filtrate pump. The first filtrate pump and the second filtrate pump are started at the same time to quickly discharge the sewage in the gas-water separator. Step 4: When the first filtrate pump and the second filtrate pump are started at the same time, the water level in the gas-water separator continues to rise. When the water level reaches the position of the safety liquid level detection sensor, the safety liquid level detection sensor feeds back the liquid level detection information to the main controller, and the main controller issues an alarm message and automatically shuts down the magnetic levitation vacuum pump and peripheral devices; Step 5: When the main controller is switched to the manual mode, a control instruction is issued by operating the main controller to control the first filtrate pump, the second filtrate pump and the magnetic levitation vacuum pump to start or shut down.

[0017] The present invention adopts the above technical solution and has the following beneficial effects: 1. The liquid level control device in the present invention can detect the liquid level state in the gas-water separator in real time, control the water level in the gas-water separator to maintain below the safe water level, and ensure the safe, long-term and stable operation of the equipment; at the same time, according to the change of water level, the filtrate pump is periodically controlled to start and shut down, so as to avoid the waste of electricity and shorten the life of the equipment caused by the continuous operation of the filtrate pump, which is conducive to energy saving and consumption reduction and reducing the operating cost of the equipment.

[0018] 2. The gas-water separator of the present invention can filter the fiber impurities mixed in the air into the sewage, and can discharge the sewage in the gas-water separator in time through the drainage component, which is convenient to use, and can periodically discharge the sewage according to the change of the water level in the gas-water separator to ensure that the water level in the gas-water separator is maintained below the safe water level.

[0019] 3. In the present invention, when the positions of various liquid level detection sensors are fixed, the values ​​of the control parameters can be set according to the use requirements to change the height of the safe water level. At the same time, the main controller can control the start of the first filtrate pump and / or the second filtrate pump of the drainage component according to the water level to adjust the drainage speed, thereby quickly discharging the sewage in the gas-water separator, keeping the water level in the gas-water separator below the safe water level, and improving the use effect.

[0020] 3. In the present invention, the gas-water separator is in a state of continuous, uniform and stable water inflow, so the first filtrate pump and the second filtrate pump are periodically opened and closed to achieve energy saving, and a delayed opening is set to prevent the system from being too sensitive and causing frequent start and stop of the filtrate pump to cause equipment damage.

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of the embodiment of the present invention when in use; Figure 3Schematic diagram of the control principle of the main controller in an embodiment of the present invention.

[0023] In the figure: 1-lower limit liquid level detection sensor; 2-upper limit liquid level detection sensor; 3-safety liquid level detection sensor; 4-first filtrate pump; 5-second filtrate pump; 6-main controller; 7-drainage main pipe; 8-drainage branch pipe; 9-magnetic levitation vacuum pump; 10-gas-water separator; 101-air inlet; 102-air outlet; 103-cylinder. DETAILED DESCRIPTION

[0024] like Figure 1-3 As shown: a liquid level control device for a gas-water separator of a magnetic levitation vacuum pump comprises a gas-water separator 10, wherein a liquid level detection component is arranged in the gas-water separator 10, wherein the liquid level detection component is used to detect the minimum liquid level, the maximum liquid level and the safe liquid level in the gas-water separator 10, wherein a liquid discharge port is arranged below the gas-water separator 10, wherein the liquid discharge port is connected with a liquid discharge component, wherein the liquid discharge component and the liquid level detection component are electrically connected with a main controller 6 respectively, wherein the main controller 6 periodically adjusts the liquid discharge amount of the liquid discharge component according to the liquid level in the gas-water separator 10, thereby maintaining the liquid level in the gas-water separator 10 below the minimum liquid level.

[0025] The gas-water separator 10 is a prior art, and the overall structure of the gas-water separator 10 includes a cylinder 103, wherein an air inlet 102 is arranged above the cylinder 103, and an air outlet 102 is arranged on one side of the cylinder 103. The air inlet 102 is connected with the air outlet 102 through the inner cavity of the cylinder 103, and a spray component (not shown in the figure) for spraying water mist for intercepting dust in the air is arranged below the air inlet 101 in the cylinder 103, and an interception component for intercepting moisture in the air is arranged at the position of the air outlet 102 in the cylinder 103.

[0026] A water collecting chamber (not shown in the figure) is provided in the cylinder 103 below the spray assembly, and the water collecting chamber is used to collect the sprayed water.

[0027] In this embodiment, the spray assembly is the prior art, and the spray assembly includes multiple spray pipes. The spray pipes are arranged in the cylinder 103 and are located below the air inlet 102. Multiple spray heads are installed on the spray pipes. The spray pipes are connected to the external spray liquid. After the spray enters the spray pipes, it is sprayed out through the spray heads. At this time, the spray liquid is used to intercept dust in the air, which is convenient to use.

[0028] The interception component is a prior art, which is arranged in the cylinder 103 and is used to filter the air after spraying to intercept excess moisture in the air, and then the air with the moisture filtered out is discharged from the air outlet 102.

[0029] The liquid level detection component includes a lower limit liquid level detection sensor 1, an upper limit liquid level detection sensor 2 and a safety liquid level detection sensor 3, and the output ends of the lower limit liquid level detection sensor 1, the upper limit liquid level detection sensor 2 and the safety liquid level detection sensor 3 are electrically connected to the input end of the main controller 6 respectively.

[0030] The real-time liquid level signals detected by the lower limit liquid level detection sensor 1 , the upper limit liquid level detection sensor 2 and the safety liquid level detection sensor 3 are sent to the main controller 6 .

[0031] The lower limit liquid level detection sensor 1 is arranged in the gas-water separator 10 at the lowest liquid level, and the upper limit liquid level detection sensor 2 is arranged above the lower limit liquid level detection sensor 1 . The upper limit liquid level detection sensor 2 is arranged at a certain distance from the lower limit liquid level detection sensor 1 .

[0032] Designed in this way, in the embodiment, the lower limit liquid level detection sensor 1 is used to detect the lowest liquid level in the gas-water separator 10; the upper limit liquid level detection sensor 2 is used to detect the highest liquid level in the gas-water separator 10, which is convenient to use; the lowest liquid level is also the safe liquid level of the gas-water separator 10, and the main controller 6 delays the control of the drainage component to start according to the detection signal of the lower limit liquid level detection sensor 1 or the upper limit liquid level detection sensor 2, so that the liquid level in the gas-water separator 10 is maintained below the lowest liquid level.

[0033] The safety liquid level detection sensor 3 is arranged in the gas-water separator 10 and is located above the high limit liquid level detection sensor 2 . The safety liquid level detection sensor 3 and the high limit liquid level detection sensor 2 are arranged at a certain distance.

[0034] In this embodiment, the safety liquid level detection sensor 3 is used to detect whether the liquid level in the gas-water separator 10 reaches the safety liquid level. In this embodiment, the safety liquid level is also the limit liquid level of the gas-water separator 10. When the liquid level in the gas-water separator 10 reaches the safety liquid level, it indicates that the liquid level in the gas-water separator 10 has exceeded the limit. At this time, the main controller 6 controls the whole machine to stop working.

[0035] The liquid discharge assembly includes a first filtrate pump 4 and a second filtrate pump 5 , and the water inlets of the first filtrate pump 4 and the second filtrate pump 5 are both connected to the liquid discharge port of the gas-water separator 10 through a connecting pipeline.

[0036] The control ends of the first filtrate pump 4 and the second filtrate pump 5 are electrically connected to the signal output end of the main controller 6, and the main controller 6 outputs a control signal for independently controlling the first filtrate pump 4 and the second filtrate pump 5 to start and perform drainage operations.

[0037] The connecting pipeline includes a main drainage pipe 7 , which is installed on the drainage port of the gas-water separator 10 . The other end of the main drainage pipe 7 is connected to a branch drainage pipe 8 , and the branch drainage pipe 8 is arranged vertically to the main drainage pipe 7 .

[0038] The first filtrate pump 4 and the second filtrate pump 5 are respectively connected to the two ends of the drainage branch pipe 8. The first filtrate pump 4 and the second filtrate pump 5 work to suck the sewage in the gas-water separator 10 through the drainage branch pipe 8 and the drainage main pipe 7.

[0039] In this embodiment, the air outlet 102 of the gas-water separator 10 is connected to the magnetic levitation vacuum pump 9, the main controller 6 is arranged on one side of the magnetic levitation vacuum pump 9, and the output end and input end of the main controller 9 are electrically connected to the control end and signal output end of the magnetic levitation vacuum pump 9 respectively.

[0040] The main controller 9 sends a control signal to control the magnetic levitation vacuum pump 9 to start or shut down, and the operation data of the magnetic levitation vacuum pump 9 during operation is transmitted to the main controller 9.

[0041] The output end and the input end of the main controller 9 are electrically connected to a control screen, and the control screen is used to display and adjust the detection parameters and control parameters in the main controller.

[0042] In this embodiment, the lower limit liquid level detection sensor 1, the upper limit liquid level detection sensor 2 and the safety liquid level detection sensor 3 are one of a float liquid level gauge, an electronic liquid level gauge or a liquid level sensor.

[0043] The arrangement positions of the lower limit liquid level detection sensor 1 , the upper limit liquid level detection sensor 2 and the safety liquid level detection sensor 3 can be set according to the size of the cavity in the gas-water separator 10 .

[0044] The present invention also provides a liquid level control method for a gas-water separator of a magnetic levitation vacuum pump. Based on the liquid level control device for a gas-water separator of a magnetic levitation vacuum pump, the control method includes an automatic mode and a manual mode, wherein the automatic mode is performed according to the following steps: Step 1: The lower limit liquid level detection sensor 1, the upper limit liquid level detection sensor 2 and the safety liquid level detection sensor 3 are sequentially arranged at different height positions in the gas-water separator 10 in order from low to high.

[0045] Step 2: When the water level in the gas-water separator 10 reaches the position of the lower limit liquid level detection sensor 1, the lower limit liquid level detection sensor 1 feeds back the liquid level detection information to the main controller 6. At this time, the main controller 6 issues a control instruction after a delay of 15 seconds to control the first filtrate pump 4 to start. At this time, the first filtrate pump 4 works to suck the sewage in the gas-water separator 10 through the drainage branch pipe 8 and the drainage main pipe 7 and discharge it to the outside; when the water level in the gas-water separator 10 drops below the lower limit liquid level detection sensor 1, the lower limit liquid level detection sensor 1 transmits the liquid level detection information to the main controller 6. The main controller 6 issues a control instruction after a delay of 60 seconds to control the first filtrate pump 4 to close.

[0046] Step three: After the first filtrate pump 4 is started, the water level in the gas-water separator 10 continues to rise. After the water level reaches the position of the upper limit liquid level detection sensor 2, the upper limit liquid level detection sensor 2 feeds back the liquid level detection information to the main controller 6. The main controller 6 issues a control command after a delay of 5 seconds to control the start of the second filtrate pump 5. At this time, the first filtrate pump 4 and the second filtrate pump 5 are started at the same time to quickly discharge the sewage in the gas-water separator 10.

[0047] Step 4: When the first filtrate pump 4 and the second filtrate pump 5 are started at the same time, the water level in the gas-water separator 10 continues to rise. When the water level reaches the position of the safety liquid level detection sensor 3, the safety liquid level detection sensor 3 feeds back the liquid level detection information to the main controller 6. The main controller 6 issues an alarm message and automatically shuts down the magnetic levitation vacuum pump 9 and peripheral devices.

[0048] Step 5: When the main controller 6 is switched to the manual mode, a control instruction is issued by operating the main controller 6 to control the first filtrate pump 4, the second filtrate pump 5 and the magnetic suspension vacuum pump 9 to start or shut down.

[0049] For those skilled in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the protection scope of the present invention.

Claims

1. A liquid level control device for a gas-water separator of a magnetic levitation vacuum pump, comprising a gas-water separator (10), characterized in that: The gas-water separator (10) is provided with a liquid level detection component, which is used to detect the lowest liquid level, the highest liquid level and the safe liquid level in the gas-water separator (10). A liquid discharge port is provided below the gas-water separator (10), and the liquid discharge port is connected to the liquid discharge component. The liquid discharge component and the liquid level detection component are respectively electrically connected to a main controller (6). The main controller (6) periodically adjusts the liquid discharge amount of the liquid discharge component according to the height of the liquid level in the gas-water separator (10), thereby maintaining the liquid level in the gas-water separator (10) below the lowest liquid level.

2. The liquid level control device for the gas-water separator of the magnetic levitation vacuum pump according to claim 1, characterized in that: The liquid level detection component comprises a lower limit liquid level detection sensor (1), an upper limit liquid level detection sensor (2) and a safety liquid level detection sensor (3); the output ends of the lower limit liquid level detection sensor (1), the upper limit liquid level detection sensor (2) and the safety liquid level detection sensor (3) are respectively electrically connected to the input end of the main controller (6); and real-time liquid level signals detected by the lower limit liquid level detection sensor (1), the upper limit liquid level detection sensor (2) and the safety liquid level detection sensor (3) are sent to the main controller (6).

3. The liquid level control device for the gas-water separator of the magnetic levitation vacuum pump according to claim 2, characterized in that: The lower limit liquid level detection sensor (1) is arranged in the gas-water separator (10) at the lowest liquid level, and the upper limit liquid level detection sensor (2) is arranged above the lower limit liquid level detection sensor (1). The upper limit liquid level detection sensor (2) and the lower limit liquid level detection sensor (1) are arranged at a certain distance.

4. The liquid level control device for the gas-water separator of the magnetic levitation vacuum pump according to claim 3, characterized in that: The lower limit liquid level detection sensor (1) is used to detect the lowest liquid level in the gas-water separator (10), and the upper limit liquid level detection sensor (2) is used to detect the highest liquid level in the gas-water separator (10); the main controller (6) controls the start of the liquid discharge component in a delayed manner according to the detection signal of the lower limit liquid level detection sensor (1) or the upper limit liquid level detection sensor (2), so that the liquid level in the gas-water separator (10) is maintained below the lowest liquid level.

5. The liquid level control device for the gas-water separator of the magnetic levitation vacuum pump according to claim 4, characterized in that: The safety liquid level detection sensor (3) is arranged in the gas-water separator (10) and is located above the upper limit liquid level detection sensor (2). The safety liquid level detection sensor (3) and the upper limit liquid level detection sensor (2) are arranged at a certain distance. The safety liquid level detection sensor (3) is used to detect whether the liquid level in the gas-water separator (10) has reached a safety liquid level. The safety liquid level is also the limit liquid level of the gas-water separator (10) during operation.

6. The liquid level control device for the gas-water separator of the magnetic levitation vacuum pump according to claim 5, characterized in that: The liquid discharge assembly comprises a first filtrate pump (4) and a second filtrate pump (5), and the water inlets of the first filtrate pump (4) and the second filtrate pump (5) are both connected to the liquid discharge port of the gas-water separator (10) through a connecting pipeline.

7. The liquid level control device for the gas-water separator of the magnetic levitation vacuum pump according to claim 6, characterized in that: The control ends of the first filtrate pump (4) and the second filtrate pump (5) are electrically connected to the signal output end of the main controller (6), and the main controller (6) outputs a control signal for independently controlling the first filtrate pump (4) and the second filtrate pump (5) to start and perform a drainage operation.

8. The liquid level control device for the gas-water separator of the magnetic levitation vacuum pump according to claim 7, characterized in that: The connecting pipeline comprises a liquid discharge main pipe (7), the liquid discharge main pipe (7) being mounted on the liquid discharge port of the gas-water separator (10), the other end of the liquid discharge main pipe (7) being connected to a liquid discharge branch pipe (8), the liquid discharge branch pipe (8) and the liquid discharge main pipe (7) being arranged vertically; the first filtrate pump (4) and the second filtrate pump (5) are respectively connected to the two ends of the liquid discharge branch pipe (8).

9. The liquid level control device for the gas-water separator of the magnetic levitation vacuum pump according to claim 8, characterized in that: The gas outlet (102) of the gas-water separator (10) is connected to a magnetic suspension vacuum pump (9), and the output end and the input end of the main controller (9) are electrically connected to the control end and the signal output end of the magnetic suspension vacuum pump (9) respectively.

10. A method for controlling the liquid level of a gas-water separator of a magnetic levitation vacuum pump, based on the liquid level control device for a gas-water separator of a magnetic levitation vacuum pump according to claim 9, characterized in that: The control method includes automatic mode and manual mode, wherein the automatic mode is performed as follows: Step 1: the lower limit liquid level detection sensor (1), the upper limit liquid level detection sensor (2) and the safety liquid level detection sensor (3) are sequentially arranged at different heights in the gas-water separator (10) in order from low to high; Step 2: When the water level in the gas-water separator (10) reaches the position of the lower limit liquid level detection sensor (1), the lower limit liquid level detection sensor (1) feeds back the liquid level detection information to the main controller (6), and the main controller (6) issues a control instruction after a delay of 15 seconds to control the first filtrate pump (4) to start working and discharge the sewage in the gas-water separator (10); when the water level in the gas-water separator (10) drops below the lower limit liquid level detection sensor (1), the lower limit liquid level detection sensor (1) transmits the liquid level detection information to the main controller (6), and the main controller (6) issues a control instruction after a delay of 60 seconds to control the first filtrate pump (4) to shut down; Step 3: After the first filtrate pump (4) is started, the water level in the gas-water separator (10) continues to rise. When the water level reaches the position of the upper limit liquid level detection sensor (2), the upper limit liquid level detection sensor (2) feeds back the liquid level detection information to the main controller (6). The main controller (6) issues a control command after a delay of 5 seconds to control the second filtrate pump (5) to start. The first filtrate pump (4) and the second filtrate pump (5) are started at the same time to quickly discharge the sewage in the gas-water separator (10); Step 4: After the first filtrate pump (4) and the second filtrate pump (5) are started at the same time, the water level in the gas-water separator (10) continues to rise. When the water level reaches the position of the safety liquid level detection sensor (3), the safety liquid level detection sensor (3) feeds back the liquid level detection information to the main controller (6), and the main controller (6) issues an alarm message and automatically shuts down the magnetic suspension vacuum pump (9) and the peripheral device; Step 5: When the main controller (6) is switched to the manual mode, a control instruction is issued by operating the main controller (6) to control the first filtrate pump (4), the second filtrate pump (5) and the magnetic suspension vacuum pump (9) to start or shut down.

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