Ultrahigh-suction-lift air-blocking shielding lift pump device and control method thereof

Abstract

The invention relates to an ultrahigh-suction-lift air-blocking shielding lift pump device which is structurally characterized in that a lift pump comprises an inlet pipe, an air-blocking shielding pump and an outlet pipe, the inlet pipe is located below the liquid level with the suction lift of 7.5-9.5 m, and inlet water seal is formed; the outlet pipe is connected with a vacuumizing pipeline through a flange plate, the outlet pipe or the vacuumizing pipeline is connected with vacuumizing equipment, and the outlet end of the vacuumizing pipeline is inserted into water to realize outlet water sealing or is connected with an outlet sealing device; before the air-blocking shield pump is started, the vacuumizing pipeline is vacuumized through the vacuumizing equipment, liquid at the inlet pipe is completely sucked into the vacuumizing pipeline through siphonage, and after the air-blocking shield pump is started, the outlet sealing device is automatically or manually operated, and large-flow water is discharged through the drainage pipe. The device is combined with an outlet water seal shielding valve and a vacuum system with gas-water separation and vacuum keeping functions, and a water suction pipeline is vacuumized, so that the ultrahigh large suction lift pump with the suction lift larger than 9 meters is realized.

Description

Technical Field

[0001] The invention relates to an ultra-high suction range air blocking shielding lifting pump device and a control method thereof, belonging to the technical fields of water supply and drainage and fire fighting vehicle-mounted mobile emergency rescue and the like. Background Art

[0002] Normally, a rainwater inspection well is set up every 40 to 60 meters in the urban drainage network. When the diameter of the underground pipe network exceeds 1.5 meters, a sewage inspection well is set up every 80 to 120 meters. Some inspection wells are combined rainwater and sewage wells. The inspection wells of sewage pipe networks in the south are usually 15 meters deep, while those in the north are more than 9 meters deep.

[0003] In the rainy season, when the rainwater wells, sewage wells and combined rainwater and sewage wells of the urban drainage network encounter underground water pipe blockage, sewage will come out of the upstream wells. At present, high-pressure water is usually used to flush the blocked pipes. Since the blocked pipes are located underground for a long time and are exposed to sewage, they are corroded by various corrosions, the pipe walls are fragile, and landslides are easy to form. The current maintenance method is to excavate the ground at the blocked area on a large scale, and it is necessary to dig a large pit with large slopes and pump water at the same time. The project is huge and the cost is high. There are environmental problems such as dangerous sewage overflow when operating with water. If you want to use a water pump to pump water from the inspection well, the diameter of the inspection well mouth is small, usually less than or equal to 700mm, which is inconvenient to operate. It is impossible to use a large submersible sewage pump, and the flow suction range is not enough. The suction range cannot be achieved by using a self-priming pump. In the process of fire rescue, it is also necessary to quickly and timely discharge the accumulated water in the bridge hole, culvert and local flooded area. When renovating old urban areas and existing buildings, it is impossible to set up an underground fire water pump room due to limited land area, and water can only be diverted from existing water sources. The current solution is very cumbersome and expensive. There is no convenient and quick solution in the world, which is an urgent problem to be solved.

[0004] When setting up pump stations at rivers, lakes, and seaside reservoirs, the vertically arranged pump shaft of each pump is very long, so it is necessary to set up multiple supports in the length direction of the pump shaft. If the incoming water rushes rapidly, it is also necessary to set up a water inlet stabilizing flow pool (section) to increase the infrastructure cost. The construction of the pump station pump room is difficult, the project volume is large, the labor and time are long, and the cost is high. The cost of building a pump room is over 100 million yuan. For emergency rescue mobile pump stations, due to the limitations on length, width, and height, traditional self-priming pumps have couplings and bearing bodies. Traditional check valves and gate valves are difficult to achieve the purpose of modular integrated large-displacement, high-suction long-distance pumping and vehicle-mounted mobile pump stations. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an ultra-high suction range air-blocking shielded lifting pump device, which combines an outlet water-sealed shielding valve and a vacuum system with air-water separation and vacuum holding functions to form a vacuum in the water suction pipeline, thereby realizing an ultra-high suction range lifting pump with a suction range greater than 9 meters.

[0006] The last objective of the present invention is to provide a control method for the ultra-high suction range air-blocking shielding lifting pump device, by controlling the water-sealed shielding valve, the vacuum system with air-water separation and vacuum maintaining functions, and the air-blocking shielding pump in sequence, so as to achieve the lifting of the water level in the deep layer.

[0007] To solve the above problems, the specific technical scheme of the present invention is as follows: an ultra-high suction range air-blocking shielded lifting pump device, the lifting pump includes an inlet pipe, an air-blocking shielded pump and an outlet pipe, the inlet pipe is located below the liquid level with a suction range of 7.5m to 9.5m, forming an inlet water seal; the outlet pipe is connected to the vacuum pipeline through a flange, the outlet pipe or the vacuum pipeline is connected to the vacuum equipment, the outlet end of the vacuum pipeline is inserted into the water to realize the outlet water seal or connected to the outlet sealing device; before starting the air-blocking shielded pump, the vacuum pipeline is evacuated by the vacuum equipment, and the liquid at the inlet pipe is completely sucked into the vacuum pipeline through the siphon phenomenon, and then after starting the air-blocking shielded pump, the outlet sealing device is automatically or manually connected, and a large flow of water is discharged through the drain pipe.

[0008] The vacuum equipment is composed of a vacuum pump and an air-water separator. Two upper and lower liquid level sensors are arranged in the air-water separator. The bottom of the air-water separator is connected to the vacuum pipeline. The top of the air-water separator is connected to the air inlet of the vacuum pump through the pipeline. A two-way solenoid valve is arranged on the pipeline.

[0009] The vacuum pipeline is a hose valve composed of a hollow sleeve and a soft rubber tube. The outer circumference of the hollow sleeve is sealed and connected to the inner surface of one end of the soft rubber tube. The soft rubber tube serves as a drain pipe and the end is positioned by a guide and inserted into the pool to form an outlet water seal.

[0010] The vacuum pipeline is an outer steel pipe, and the inner cavity is sealed to connect a hose valve composed of a hollow casing and a soft rubber tube; a hose valve composed of a hollow casing and a soft rubber tube is connected to the outlet end of the outer steel pipe as an outlet sealing device, and the length of the soft rubber tube connected at the end is more than ten times the diameter of the hollow casing; a guide is provided at the end of the soft rubber tube.

[0011] The vacuum pipeline is a steel pipe structure, and the inner cavity is sealed to connect a hose valve composed of a hollow casing and a soft rubber hose. The outlet sealing device connected to the outlet end of the vacuum pipeline is composed of a gate valve and a check valve, and the outlet of the check valve is connected to a drain pipe.

[0012] At least one partition tongue is provided in the hollow sleeve, and the partition tongue blocks the soft rubber tube from entering the inner cavity of the hollow sleeve; when there is one partition tongue, the length of the partition tongue is greater than the radius of the hollow sleeve, and an oblique reinforcing rib is provided on the inner surface of the partition tongue; when there are multiple partition tongues, and they are evenly distributed on the inner wall of the hollow sleeve, the length of the partition tongue is less than the radius of the hollow sleeve, and an oblique reinforcing rib is provided on the inner end of the partition tongue; every two adjacent partition tongues form a group, and each group of partition tongues is provided with a smooth connecting rib near the end of the central axis.

[0013] The outlet pipe is provided with a check valve, the outlet end of the check valve is connected to the gate valve through an upward elbow; the check valve and the elbow form a vacuum pipeline, and the upper part of the vacuum pipeline is connected to a vacuum device; the gate valve serves as an outlet sealing device and is connected to an external drain pipe.

[0014] A control method for an ultra-high suction lift double air blocking shield lift pump, characterized by comprising the following steps: 1) The inlet pipe is vertically inserted into the liquid level to be lifted to complete the inlet water seal; 2) Start the vacuum equipment first. The vacuum pump of the vacuum equipment will evacuate the vacuum pipeline, and the liquid will be lifted to fill the vacuum pipeline under the action of siphon. When the liquid level reaches the upper liquid level sensor of the gas-water separator, the vacuum pump will stop and the outlet will be sealed through the outlet sealing device; 3) Start the gas blocking shielding pump, and the outlet water sealing device prevents the outlet gas from flowing back, completing the liquid level lifting and drainage; 4) During the drainage process, gas precipitated from the liquid or gas leaking in from the outlet continuously enters the vacuum pipeline and enters the gas-water separator, and is monitored by the upper and lower liquid level sensors. When the liquid level is lower than the lower liquid level sensor, the vacuum pump is started, the two-way solenoid valve is opened, and the gas-water separator is vacuumed until the liquid level reaches the upper liquid level sensor, the vacuum pump stops, and the two-way solenoid valve is closed.

[0015] The ultra-high suction range air-blocking shielded lifting pump device of the present application adopts a structure that combines the water seal of the outlet and inlet, the air-water separator device and the air-blocking shielded pump. The air-blocking shielded pump itself can ensure that the pump is shielded from the outside world. At the same time, there is a sealed cavity between the valve body and the pipeline connected to it and the lifting liquid level, so that during the vacuum pumping process of the air-water separator device, the deep liquid surface is sucked in by the vacuum siphon, and it is ensured that there is no gas remaining in the vacuum pipeline. Only after the three are combined can the vacuum-assisted air-blocking shielded pump truly achieve a large suction range operation, and the suction range height can reach 7.5m to 9.5m. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an ultra-high suction range air blocking shielding lifting pump device in Example 1.

[0017] Figure 2 It is a structural schematic diagram of the ultra-high suction range air blocking shielding lifting pump device of Example 2.

[0018] Figure 3 This is a schematic structural diagram of the ultra-high suction range air blocking shielding lift pump device of Example 3.

[0019] Figure 4 It is a structural schematic diagram of the ultra-high suction range air blocking shielding lifting pump device of Example 4.

[0020] Figure 5This is a schematic diagram of the structure of a hose valve with multiple diaphragms.

[0021] Figure 6 for Figure 5 AA section view.

[0022] Figure 7 This is a schematic diagram of the structure of a hose valve with a single diaphragm.

[0023] Figure 8 for Figure 7 BB cross-sectional view. DETAILED DESCRIPTION Embodiment 1

[0024] like Figure 1 As shown, an ultra-high suction range air-blocking shielded lifting pump device includes an inlet pipe 11, an air-blocking shielded pump 12 and an outlet pipe 13. The air-blocking shielded pump 12 is the application number of the applicant published on December 28, 2018: 2018208365394, and the name is "High-efficiency Leak-free Shielded Pump". It adopts an air-blocking shielding structure to achieve efficient sealing between the pump cavity and the motor cavity and the outside world in the air-blocking shielded pump 12, laying a foundation for subsequent vacuuming. The inlet pipe 11 is inserted below the liquid surface with a suction range of 7.5m to 9.5m to form an inlet water seal.

[0025] The outlet pipe 13 is connected to a vacuum line 15 through a flange, and a vacuum device 14 is connected to the outlet pipe 13. The vacuum line 15 of this embodiment is a hose valve composed of a hollow sleeve 1 and a soft rubber hose 2. The outer circumference of the hollow sleeve 1 is sealed and connected to the inner surface of one end of the soft rubber hose 2; the soft rubber hose 2 is used as a drainage pipe and its end is inserted into a pool, a low-level drainage river or a downstream drainage system to form an outlet water seal. Since the outlet is a hose, the drainage pressure is relatively large, and a guide 19 needs to be used to locate and insert it into the pool. The guide 19 adopts an elbow structure fixed on the shore, and the two ends are respectively fixed with a density connection hose to change the water outlet direction.

[0026] like Figure 1 As shown, the vacuum pumping equipment 14 shown is composed of a vacuum pump 21 and an air-water separator 22. Two upper and lower liquid level sensors 23 and 24 are provided in the air-water separator 22. The bottom of the air-water separator 22 is connected to the vacuum pump pipeline 15. The top of the air-water separator 22 is connected to the air inlet of the vacuum pump 21 through the pipeline 25. A two-way solenoid valve 26 is provided on the pipeline 25.

[0027] Before starting the air-blocking shielding pump 12, the vacuum pipeline 15 is evacuated by the vacuum equipment 14. Since the outlet drain pipe is water-tight and the soft rubber hose 2 is closed, the liquid at the inlet pipe 11 is completely sucked into the vacuum pipeline 15 through the siphon phenomenon. When the lower liquid level sensor 24 is triggered, it means that the vacuum pipeline 15 is full of liquid. After starting the air-blocking shielding pump 12 again, the hose valve as the outlet sealing device is automatically pushed open under the action of the large flow of water, and the large flow of water is discharged through the soft rubber hose 2 of the hose valve as a drain pipe.

[0028] This embodiment is used on a mobile rescue vehicle, and the hose valve is easy to move and store, and at the same time, the rescue efficiency is improved during rescue. Embodiment 2

[0029] like Figure 2 As shown, on the basis of the first embodiment, an outer steel pipe 16 is provided on the outer circumference of the hose valve as a vacuum pipeline 15, the inner diameter of the outer steel pipe 16 is larger than the outer diameter of the hollow casing 1, and the soft rubber tube 2 of the hose valve is completely accommodated in the outer steel pipe 16; one end of the outer steel pipe 16 is sealed and connected to the outlet pipe 13, and the other end is connected to the outlet sealing device; the outlet sealing device of this embodiment is a hose valve composed of another hollow casing 1 and a soft rubber tube 2, and the length of the soft rubber tube 2 connected at the end is more than ten times the diameter of the hollow casing 1; a guide 19 is provided at the soft rubber tube 2 at the end.

[0030] This embodiment is applied to external mobile rescue, and there is no downward channel at the output end. Embodiment 3

[0031] like Figure 3 As shown, on the basis of the first embodiment, an outer steel pipe 16 is provided on the outer circumference of the hose valve, the inner diameter of the outer steel pipe 16 is larger than the outer diameter of the hollow casing 1, and the soft rubber tube 2 of the hose valve is completely accommodated in the outer steel pipe 16; one end of the outer steel pipe 16 is sealed and connected to the outlet pipe 13, and the other end is connected to the outlet sealing device; the outlet sealing device of this embodiment is composed of a gate valve 17 and a check valve 18, and the outlet of the check valve 18 is connected to the drainage pipeline.

[0032] The outer steel pipe 16 of this embodiment serves as the vacuum pipeline 15, and the vacuum device 14 is connected to the outer steel pipe 16. When the vacuum device 14 is started, the hose valve has no sealing effect and is in an open device under pressure. The outlet sealing device relies on the gate valve 17 to achieve sealing. The hose valve is when the drainage is completed. The soft rubber hose 2 can quickly block the hollow casing 1, thereby preventing the negative pressure formed by the outlet pipe 13 from causing water backflow.

[0033] Before starting the air-blocking shielded pump 12, the vacuuming pipeline 15 is evacuated by the vacuuming device 14, and the liquid at the inlet pipe 11 is completely sucked into the vacuuming pipeline 15 by the siphon phenomenon. After starting the air-blocking shielded pump 12, the gate valve 17 is opened manually or electrically, and a large flow of water passes through the gate valve 17 and the check valve 18 and is discharged from the drain pipe. When the suction range is at the upper limit, there will be flow loss when the pump is working in some cases. In this case, an induction device is added at the inlet of the air-blocking shielded pump (12) to ensure a high suction range.

[0034] This embodiment is used in a fixed drainage pump station, which occupies a small area, has a simple structure, and reduces the construction cost of infrastructure.

[0035] In the above-mentioned embodiments 1 to 3, the outer circumference of the hollow sleeve 1 is sealed and connected to the inner surface of one end of the soft rubber tube 2; the soft rubber tube 2 usually adopts a woven structure hose with a rubber coating on the inner surface. The woven structure hose has high strength and long service life. The rubber coating on the inner surface serves to seal with the end face of the partition tongue 3 or close the tail of the soft rubber tube 2 to form a self-sealing structure; each hollow sleeve 1 of the hose valve is provided with a partition tongue, such as Figure 5 and Figure 6 As shown, when the number of partition tongues 3 is an even number, the circumference of the partition tongues 3 is evenly distributed on the inner wall of the hollow casing 1, and the length of the partition tongues 3 is smaller than the radius of the hollow casing 1. An oblique reinforcing rib 4 is provided at the inner end of the partition tongue 3; every two adjacent partition tongues 3 form a group, and each group of partition tongues 3 is provided with a smooth connecting rib 5 near the end of the central axis. The reinforcing rib 4 further increases the strength of the partition tongues, and can also guide the dirt. Under the scouring of water flow, the dirt can be discharged from the opening along the inclined surface of the reinforcing rib. A connecting rib 5 is provided between the two partition tongues 3 to support the port of the partition tongue and to ensure that the partition tongues are equidistant and non-deformed. At the same time, the gaps left between the partition tongues of different groups allow the dirt to be discharged along the oblique smooth reinforcing rib 4 under the scouring of water, thereby preventing the dirt in the pumped medium from being blocked by the partition tongues. As shown Figure 7 and Figure 8 As shown, the hose valve with multiple tongues can also be replaced by a hose valve with a single tongue, and its structure is as follows: there is one tongue 3, the length of tongue 3 is greater than the radius of hollow casing 1, and the inner surface of tongue 3 is provided with oblique reinforcing ribs 4. In the working state, tongue 3 blocks the soft rubber tube 2 from entering the inner cavity of hollow casing 1. At the same time, reinforcing ribs 4 further play a role in increasing the strength of tongues, and can guide dirt. Under the flushing of water flow, dirt can be discharged from the opening along the inclined surface of reinforcing ribs. The hose valve can prevent outside air from entering the pump cavity when the pump is in the working state, shield the air, and thus prevent the pump from losing fluid and running idly. Embodiment 4

[0036] like Figure 4As shown, on the basis of embodiment 1, the outlet pipe 13 is provided with a check valve 18, the outlet end of the check valve 18 is connected to the gate valve 17 through an upward elbow 19, the check valve 18 and the elbow 19 form a vacuum pipeline 15, the check valve 18 prevents the gas from entering the end of the pipeline and causing the shielded pump to drop; the upper part of the elbow 19 is connected to the vacuum equipment 14, and the gate valve 17 serves as an outlet sealing device.

[0037] Before starting the air-blocking shielded pump 12, the vacuuming pipeline 15 is evacuated by the vacuuming device 14, and the liquid at the inlet pipe 11 is completely sucked into the vacuuming pipeline 15 by the siphon phenomenon. After starting the air-blocking shielded pump 12, the gate valve 17 is opened manually or electrically, and a large flow of water passes through the check valve 18 and the gate valve 17 and is discharged from the drain pipe. When the suction range is at the upper limit, there will be flow loss when the pump is working in some cases. In this case, an induction device is added at the inlet of the air-blocking shielded pump (12) to ensure a high suction range.

[0038] Used in fixed drainage pumping stations, it occupies a small area, has a simple structure, and reduces the construction cost of infrastructure. Embodiment 5

[0039] The control method of the super-high suction range gas blocking shielding lift pump device in embodiments 1 to 4 comprises the following steps: 1) The inlet pipe 11 is vertically inserted into the liquid level to be lifted to complete the inlet water seal; 2) Start the vacuum device 14 first, the vacuum pump 21 of the vacuum device 14 evacuates the vacuum pipeline 15, and the liquid is lifted to fill the vacuum pipeline 15 under the action of siphon. When the liquid level reaches the upper liquid level sensor 23 of the gas-water separator 22, the vacuum pump 21 stops, and the outlet is sealed by the outlet sealing device; 3) Start the gas blocking shielding pump 12, and the outlet water sealing device prevents the outlet gas from flowing back, completing the liquid level lifting and drainage; 4) During the drainage process, gas precipitated from the liquid or gas leaking in from the outlet continuously enters the vacuum line 15 and enters the gas-water separator 22, and is monitored by the upper and lower liquid level sensors 23 and 24. When the liquid level is lower than the lower liquid level sensor 24, the vacuum pump 21 is started, the two-way solenoid valve 26 is opened, and the gas-water separator 22 is vacuumed until the liquid level reaches the upper liquid level sensor 23, at which time the vacuum pump 21 is stopped and the two-way solenoid valve 26 is closed.

Claims

1. An ultra-high suction range gas blocking shielding lifting pump device, characterized in that: The lifting pump comprises an inlet pipe (11), an air-blocking shielded pump (12) and an outlet pipe (13). The inlet pipe (11) is located below a liquid surface with a suction distance of 7.5 m to 9.5 m to form an inlet water seal. The outlet pipe (13) is connected to a vacuum pumping pipeline (15) via a flange. The outlet pipe (13) or the vacuum pumping pipeline (15) is connected to a vacuum pumping device (14). The outlet end of the vacuum pumping pipeline (15) is inserted into water to achieve an outlet water seal or is connected to an outlet sealing device. Before starting the air-blocking shielded pump (12), the vacuum pumping pipeline (15) is evacuated via the vacuum pumping device (14), and the liquid at the inlet pipe (11) is completely sucked into the vacuum pumping pipeline (15) by a siphon phenomenon. After starting the air-blocking shielded pump (12), the outlet sealing device is automatically or manually closed, and a large amount of water is discharged through a drain pipe.

2. The ultra-high suction range gas blocking shielding lifting pump device according to claim 1 is characterized in that: The vacuum pumping device (14) is composed of a vacuum pump (21) and a gas-water separator (22). Two upper and lower liquid level sensors (23, 24) are provided in the gas-water separator (22). The bottom of the gas-water separator (22) is connected to the vacuum pumping pipeline (15). The top of the gas-water separator (22) is connected to the air inlet of the vacuum pump (21) via a pipeline (25). A two-way solenoid valve (26) is provided on the pipeline (25).

3. The ultra-high suction range gas blocking shielding lifting pump device according to claim 1 is characterized in that: The vacuum extraction pipeline (15) is a hose valve composed of a hollow sleeve (1) and a soft rubber hose (2), wherein the outer circumference of the hollow sleeve (1) is sealedly connected to the inner surface of one end of the soft rubber hose (2); the soft rubber hose (2) serves as a drain pipe and the end thereof is positioned by a guide (19) and inserted into the pool to form an outlet water seal.

4. The ultra-high suction range gas blocking shielding lifting pump device according to claim 1 is characterized in that: The vacuum extraction pipeline (15) is an outer steel pipe (16), and the inner cavity is sealed to connect a hose valve composed of a hollow sleeve (1) and a soft rubber tube (2); a hose valve composed of a hollow sleeve (1) and a soft rubber tube (2) is connected to the outlet end of the outer steel pipe (16) as an outlet sealing device, and the length of the soft rubber tube (2) connected at the end is more than ten times the diameter of the hollow sleeve (1); and a guide (19) is provided at the end of the soft rubber tube (2).

5. The ultra-high suction range gas blocking shielding lifting pump device according to claim 1 is characterized in that: The vacuum pipeline (15) is a steel pipe structure, and the inner cavity is sealed to connect a hose valve composed of a hollow casing (1) and a soft rubber hose (2). The outlet sealing device connected to the outlet end of the vacuum pipeline (15) is composed of a gate valve (17) and a check valve (18), and the outlet of the check valve (18) is connected to a drain pipe.

6. The ultra-high suction range gas blocking shielding lift pump device according to claim 3, 4 or 5, characterized in that: At least one partition tongue (3) is provided in the hollow sleeve (1), and the partition tongue (3) blocks the soft rubber tube (2) from entering the inner cavity of the hollow sleeve (1); when there is only one partition tongue (3), the length of the partition tongue (3) is greater than the radius of the hollow sleeve (1), and an oblique reinforcing rib is provided on the inner surface of the partition tongue (3); when there are multiple partition tongues and they are evenly distributed on the inner wall of the hollow sleeve (1), the length of the partition tongue (3) is less than the radius of the hollow sleeve (1), and an oblique reinforcing rib (4) is provided at the inner end of the partition tongue (3); every two adjacent partition tongues (3) form a group, and each group of partition tongues (3) is provided with a smooth connecting rib (5) near the end of the central axis.

7. The ultra-high suction range gas blocking shielding lifting pump device according to claim 1 is characterized in that: The outlet pipe (13) is provided with a check valve (18), and the outlet end of the check valve (18) is connected to the gate valve (17) via an upward elbow (19); the check valve (18) and the elbow (19) form a vacuum pipeline (15), and the upper part of the vacuum pipeline (15) is connected to the vacuum device (14); the gate valve (17) serves as an outlet sealing device and is connected to an external drain pipe.

8. A control method for the ultra-high suction head double air blocking shield lift pump according to any one of claims 1 to 7, characterized in that The following steps are involved: 1) The inlet pipe (11) is vertically inserted into the liquid level to be lifted to complete the inlet water seal; 2) First, the vacuum device (14) is started, and the vacuum pump (21) of the vacuum device (14) evacuates the vacuum pipeline (15), so that the liquid is lifted up and fills the vacuum pipeline (15) under the action of siphoning. When the liquid level reaches the upper liquid level sensor (23) of the gas-water separator (22), the vacuum pump (21) is stopped, and the outlet is sealed by the outlet sealing device; 3) Start the gas blocking shield pump (12), and the outlet water sealing device prevents the outlet gas from flowing back, thus completing the liquid level lifting and drainage; 4) During the drainage process, gas precipitated from the liquid or gas entering from the outlet continuously enters the vacuum pipeline (15) and enters the gas-water separator (22), and is monitored by the upper and lower liquid level sensors (23, 24). When the liquid level is lower than the lower liquid level sensor (24), the vacuum pump (21) is started, the two-way solenoid valve (26) is opened, and the gas-water separator (22) is vacuumed until the liquid level reaches the upper liquid level sensor (23). The vacuum pump (21) is stopped and the two-way solenoid valve (26) is closed.

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