An inflating device and inflating method for SF6 column-mounted circuit breaker

Abstract

The present invention provides an inflation device for an SF6 pole-mounted circuit breaker and an inflation method thereof, comprising a mounting frame, a gas storage bottle with a pressure gauge, an inflation pipe, a first valve, an air pump, a recovery bottle, a controller, a pressure supply mechanism, an air inlet three-way solenoid valve, an air outlet three-way solenoid valve, a connector, a connecting pipe, an air extraction pipe, an air suction pipe, a self-locking component, a gas storage pipe and a pressure supply pipe. The controller cooperates with the air inlet three-way solenoid valve, the air pump and the air outlet three-way solenoid valve to realize control of the direct gas flow path of the gas storage bottle, the recovery bottle, the pole-mounted circuit breaker and the pressure supply mechanism, thereby realizing vacuuming, inflation and gas recovery of the pole-mounted circuit breaker, and cooperating with the pressure supply mechanism to supplement the internal gas of the gas storage bottle to maintain the normal inflation work, thereby reducing SF6 gas emissions and improving SF6 utilization. During the working process, it is only necessary to connect the connecting pipe to the pole-mounted circuit breaker on site, thereby reducing the work of disassembling and assembling the pipelines and improving the inflation work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power maintenance, and in particular to an inflating device and an inflating method for an SF6 column-mounted circuit breaker. Background Art

[0002] In recent years, with the transformation of urban and rural power grids, SF6 circuit breakers and fully enclosed combined electrical installation equipment with SF6 gas as the main insulating material have been widely used in power systems. Due to the long maintenance cycle, convenient maintenance, high power supply reliability, and small ground and space occupation of SF6 circuit breakers and fully enclosed combined electrical installation equipment, they have been widely used in power systems. At the same time, due to the closed combination, the influence of the external environment is avoided, and they are suitable for installation and use in substations in cities, industrial intensive areas, and severely polluted areas.

[0003] At present, the charging method of SF6 circuit breaker is single, which is to directly connect the gas cylinder containing high-pressure SF6 gas to SF6 electrical equipment through the charging pipe after reducing the pressure through the pressure reducing valve for gas filling. This charging method has the following problems:

[0004] 1. Before gas replenishment, it is usually necessary to discharge the SF6 gas in the pole-mounted circuit breaker. The entire working process requires the use of a gas extraction device and a gas replenishment device. The staff needs to disassemble and assemble the pipeline many times, which is time-consuming and labor-intensive, and the overall work efficiency is low;

[0005] 2. When this type of device starts to inflate, it is usually necessary to discharge the air inside the inflation tube. This process easily discharges SF6 gas directly into the atmosphere. At the same time, after the inflation is completed, there will be residual gas stored in the inflation tube. When the inflation tube is disassembled, the remaining SF6 gas will also overflow to the outside, which will cause a large amount of SF6 gas waste on the one hand and pollute the atmosphere on the other hand;

[0006] 3. During the inflation process, the internal air pressure of the gas cylinder continues to decrease, and some of the gas in the gas cylinder is not easy to discharge, which has an adverse effect on the inflation process. Summary of the invention

[0007] The purpose of the present invention is to address the deficiencies in the above-mentioned technology and to propose an inflation device and an inflation method for SF6 pole-mounted circuit breaker, aiming to solve the above-mentioned problems.

[0008] The present invention provides an inflating device for an SF6 column-mounted circuit breaker and an inflating method thereof, comprising a mounting frame, a gas storage bottle with a pressure gauge, an air pump, a recovery bottle and a controller, wherein the air pump, the gas storage bottle, the recovery bottle and the controller are all arranged on the mounting frame, the gas storage bottle is provided with an inflating pipe, a first valve is provided at the connection between the gas storage bottle and the inflating pipe, a pressure supply mechanism capable of compressing the gas inside the gas storage bottle is provided inside the gas storage bottle, an inlet three-way solenoid valve is connected to the air inlet end of the air pump, an outlet three-way solenoid valve is connected to the air outlet end of the air pump, an air extraction pipe and an air suction pipe are connected to the inlet three-way solenoid valve, and a connector is provided on the air extraction pipe. , the connecting head is provided with an air pressure sensor and a connecting pipe detachably connected to the column circuit breaker, the connecting head is used to connect the exhaust pipe, the connecting pipe and the charging pipe, the connecting pipe is provided with a self-locking component that can automatically seal the connecting pipe, the connecting head is provided with an air supply valve, the air intake pipe is connected to the recovery bottle, the air outlet three-way solenoid valve is connected to an air storage pipe and a pressure supply pipe, the pressure supply pipe is connected to the pressure supply mechanism and can provide air pressure to the pressure supply mechanism, the air storage pipe is connected to the recovery bottle, and the controller is electrically connected to the air inlet three-way solenoid valve, the air outlet three-way solenoid valve and the air pump respectively.

[0009] Preferably, the pressure supply mechanism includes a partition and an airbag, the partition is movably installed in the inner cavity of the gas storage cylinder, and divides the inner cavity of the gas storage cylinder into an upper chamber and a lower chamber, the upper chamber is used to accommodate SF6 gas, the airbag is arranged at the lower chamber, and the pressure supply pipe is connected to the airbag.

[0010] Preferably, a threaded sleeve is rotatably provided on the connecting pipe, and the threaded sleeve can be threadedly connected to the charging port of the pole-mounted circuit breaker to connect the connecting pipe to the pole-mounted circuit breaker.

[0011] Preferably, the self-locking assembly includes a moving tube, an elastic member and a fixed sleeve, the fixed sleeve is provided with a sliding groove for the moving tube to move through, the side wall at the bottom of the moving tube is provided with a connecting port connected to the inner cavity of the moving tube, the bottom of the moving tube is provided with a sealing disk for sealing the bottom of the moving tube and the sliding groove, the elastic member can act on the sealing disk to make the sealing disk elastically abut against the fixed sleeve, and the top outer wall of the moving tube is provided with a pushing disk for the pole-mounted circuit breaker to push against.

[0012] Preferably, the elastic member is a spring, and the spring is sleeved on the outer wall of the movable tube. The spring can push the pushing plate to make the sealing plate elastically abut against the fixed sleeve.

[0013] Preferably, the controller is provided with an indicator light and a voice prompt module.

[0014] Preferably, the mounting frame is provided with a push frame and universal wheels.

[0015] A method for inflating an inflator for an SF6 circuit breaker, comprising the following steps:

[0016] S1: Connect the connecting pipe to the pole-mounted circuit breaker. The controller connects the suction pipe to the air inlet end of the air pump through the air inlet three-way solenoid valve and closes the suction pipe. At the same time, the gas storage pipe is connected to the air outlet end of the air pump through the air outlet three-way valve and the pressure supply pipe is closed. At this time, the valve on the pole-mounted circuit breaker is in the open state, and the first valve on the gas storage bottle is in the closed state. The controller starts the air pump. The air pump extracts SF6 gas at the pole-mounted circuit breaker through the suction pipe, the connector and the connecting pipe. At the same time, it extracts air in the inflation pipe through the suction pipe, the connector and the inflation pipe. The air pump extracts the SF6 gas at the pole-mounted circuit breaker and the air at the inflation pipe into the recovery bottle for unified recovery. In this process, the controller can control the start and stop of the air pump through the air pressure information sensed by the air pressure sensor to realize the air extraction work before SF6 gas replenishment.

[0017] S2: After step S1 is completed, the controller drives the air inlet three-way solenoid valve to close the exhaust pipe and turn off the air pump, and then opens the first valve. The gas cylinder is filled with SF6 gas to the column circuit breaker through the charging pipe, the connector and the connecting pipe. During this process, the staff can operate the controller through the internal air pressure information of the gas cylinder indicated by the pressure gauge, and start the air inlet three-way solenoid valve, the air pump and the air outlet three-way solenoid valve in the form of a button switch on the controller. The air inlet three-way solenoid valve connects the air suction pipe with the air pump and keeps the air extraction pipe closed. The air outlet three-way solenoid valve connects the pressure supply pipe with the air pump and closes the gas storage pipe. The air pump extracts the gas at the recovery bottle through the air suction pipe and guides it to the pressure supply mechanism through the pressure supply pipe to replenish the gas in the gas cylinder.

[0018] S3: After step S2 is completed, first close the valve on the pole circuit breaker and the first valve on the gas storage bottle, start the air inlet three-way solenoid valve, the air pump and the air outlet three-way solenoid valve through the controller, the air inlet three-way solenoid valve connects the air extraction pipe and the air pump and closes the air suction pipe, the air outlet three-way solenoid valve connects the gas storage pipe and the air pump and closes the pressure supply pipe, the air pump extracts the SF6 gas remaining in the connecting pipe, the connecting head and the gas charging pipe through the air extraction pipe and guides it to the recovery bottle through the gas storage pipe to realize the recovery of the residual SF6 gas. In this process, the controller determines whether the residual SF6 gas is completely collected according to the pressure information detected by the air pressure sensor. When the air pressure sensor detects that the connecting pipe, the connecting head and the gas charging pipe are in a vacuum state, the controller starts the air inlet three-way solenoid valve and closes the air pump, the air inlet three-way solenoid valve closes the air extraction pipe, and then manually opens the gas supply valve on the connecting head to connect the external air with the connecting pipe, the connecting head and the gas charging pipe to achieve the effect of balancing the air pressure, which is convenient for disassembling the connecting pipe and the pole circuit breaker.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The controller cooperates with the air inlet three-way solenoid valve, the air pump and the air outlet three-way solenoid valve to realize the direct control of the gas flow path of the gas storage bottle, the recovery bottle, the pole circuit breaker and the pressure supply mechanism, so as to realize the vacuuming, charging and gas recovery of the pole circuit breaker, and cooperate with the pressure supply mechanism to supplement the internal gas of the gas storage bottle to maintain the normal charging work, which plays a role in reducing SF6 gas emissions and improving SF6 utilization. The working process only needs to connect the connecting pipe to the pole circuit breaker on site, which reduces the disassembly and assembly of the pipeline and is conducive to improving the efficiency of the charging work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of a gas storage bottle in a certain embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a self-locking component in a certain embodiment of the present invention.

[0025] In the figure, 1-mounting frame; 11-controller; 12-hand push frame; 13-universal wheel; 2-gas storage bottle; 21-pressure gauge; 22-inflating pipe; 23-first valve; 24-upper chamber; 25-lower chamber; 3-air pump; 31-intake three-way solenoid valve; 311-exhaust pipe; 312-intake pipe; 32-exhaust three-way solenoid valve; 321-gas storage pipe; 322-pressure supply pipe; 4-recovery bottle; 5-pressure supply mechanism; 51-partition; 52-air bag; 6-connector; 61-air pressure sensor; 62-connecting pipe; 621-threaded sleeve; 63-gas supply valve; 7-self-locking component; 71-moving pipe; 711-connecting port; 712-sealing disk; 713-push disk; 72-elastic member; 73-fixing sleeve; 731-slideway. DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0027] Embodiment 1:

[0028] Reference Figures 1 to 3 The present invention provides an inflating device for an SF6 column-mounted circuit breaker, comprising a mounting frame 1, a gas storage bottle 2 with a pressure gauge 21, an air pump 3, a recovery bottle 4 and a controller 11. The air pump 3, the gas storage bottle 2, the recovery bottle 4 and the controller 11 are all arranged on the mounting frame 1. The gas storage bottle 2 is provided with an inflating pipe 22. A first valve 23 is provided at the connection between the gas storage bottle 2 and the inflating pipe 22. A pressure supply mechanism 5 capable of compressing the gas inside the gas storage bottle 2 is provided inside the gas storage bottle 2. An inlet three-way solenoid valve 31 is provided at the inlet end of the air pump 3. An outlet three-way solenoid valve 32 is provided at the outlet end of the air pump 3. An exhaust pipe 311 and an air suction pipe 312 are provided on the inlet three-way solenoid valve 31. The exhaust pipe 311 is provided with a connecting The connector 6 is provided with an air pressure sensor 61 and a connecting pipe 62 detachably connected to the column-mounted circuit breaker. The connector 6 is used to connect the exhaust pipe 311, the connecting pipe 62 and the charging pipe 22. The connecting pipe 62 is provided with a self-locking component 7 which can automatically seal the connecting pipe 62. The connector 6 is provided with an air supply valve 63. The air suction pipe 312 is connected to the recovery bottle 4. The air outlet three-way solenoid valve 32 is connected with an air storage pipe 321 and a pressure supply pipe 322. The pressure supply pipe 322 is connected to the pressure supply mechanism 5 and can provide air pressure to the pressure supply mechanism 5. The air storage pipe 321 is connected to the recovery bottle 4. The controller 11 is electrically connected to the air inlet three-way solenoid valve 31, the air outlet three-way solenoid valve 32 and the air pump 3 respectively.

[0029] The controller 11 cooperates with the inlet three-way solenoid valve 31, the air pump 3 and the outlet three-way solenoid valve 32 to realize the control of the gas flow path of the gas storage bottle 2, the recovery bottle 4, the column circuit breaker and the pressure supply mechanism 5, so as to realize the vacuuming, filling and gas recovery of the column circuit breaker, and cooperates with the pressure supply mechanism 5 to supplement the internal gas of the gas storage bottle 2 to maintain the normal progress of the filling work, which plays a role in reducing SF6 gas emissions and improving SF6 utilization. During the working process, it is only necessary to connect the connecting pipe 62 to the column circuit breaker on site, which reduces the disassembly and assembly of the pipeline and is conducive to improving the efficiency of the filling work. Among them, the controller 11 is a PLC controller 11, and the air pressure sensor 61 model is SIN-P300.

[0030] Specifically, the pressure supply mechanism 5 includes a partition 51 and an airbag 52. The partition 51 is movably installed in the inner cavity of the gas cylinder 2, and divides the inner cavity of the gas cylinder 2 into an upper chamber 24 and an upper chamber 25. The upper chamber 24 is used to accommodate SF6 gas. The airbag 52 is arranged in the upper chamber 25, and the pressure supply pipe 322 is connected to the airbag 52.

[0031] Embodiment 2:

[0032] Reference Figures 1 to 3 Combined with the technical solution of Example 1, in this embodiment, a threaded sleeve 621 is rotatably provided on the connecting pipe 62, and the threaded sleeve 621 can be threadedly connected to the inflation port of the pole-mounted circuit breaker to connect the connecting pipe 62 and install it on the pole-mounted circuit breaker.

[0033] Specifically, the self-locking assembly 7 includes a movable tube 71, an elastic member 72 and a fixed sleeve 73. The fixed sleeve 73 is provided with a slide groove 731 for the movable tube 71 to move through. The side wall at the bottom of the movable tube 71 is provided with a connecting port 711 connected to the inner cavity of the movable tube 71. The bottom of the movable tube 71 is provided with a sealing disk 712 for sealing the bottom of the movable tube 71 and the slide groove 731. The elastic member 72 can act on the sealing disk 712 to make the sealing disk 712 elastically abut against the fixed sleeve 73. The top outer wall of the movable tube 71 is provided with a pushing disk 713 for the column-mounted circuit breaker to push against.

[0034] Specifically, the elastic member 72 is a spring, which is sleeved on the outer wall of the moving tube 71 . The spring can push the pushing disk 713 so that the sealing disk 712 elastically abuts against the fixing sleeve 73 .

[0035] When the threaded sleeve 621 is used to install the connecting tube 62 of the pole-mounted circuit breaker, the tube body part at the inflation port on the pole-mounted circuit breaker pushes the pushing plate 713 on the outer wall of the moving tube 71 to drive the moving tube 71 to move relative to the fixed sleeve 73, the spring is in a compressed state, the sealing plate 712 at the bottom of the moving tube 71 is away from the fixed sleeve 73, and the connecting port 711 at the bottom of the moving tube 71 extends out of the fixed sleeve 73, and the pole-mounted circuit breaker is connected with the connecting tube 62 through the inner cavity of the moving tube 71 and the connecting port 711; when the connecting tube 62 is removed from the pole-mounted circuit breaker, the spring is reset and pushes the pushing plate 713 on the moving tube 71 to drive the moving tube 71 to move relative to the fixed sleeve 73, the connecting port 711 on the moving tube 71 is re-moved into the fixed sleeve 73, and the sealing plate 712 at the bottom of the moving tube 71 is close to the fixed sleeve 73 until the slide groove 731 is blocked to automatically block the connecting tube 62 to form a self-locking.

[0036] Specifically, the controller 11 is provided with an indicator light and a voice prompt module.

[0037] The indicator lights and voice prompt modules are provided so that the staff can intuitively obtain the progress of the inflation process, which is convenient for operation and use.

[0038] Specifically, the mounting frame 1 is provided with a push frame 12 and universal wheels 13 .

[0039] A method for inflating an inflator for an SF6 circuit breaker, comprising the following steps:

[0040] S1: Connect the connecting pipe 62 to the pole-mounted circuit breaker, the controller 11 connects the exhaust pipe 311 to the air inlet end of the air pump 3 through the air inlet three-way solenoid valve 31 and closes the air suction pipe 312, and at the same time connects the gas storage pipe 321 to the air outlet end of the air pump 3 through the air outlet three-way valve and closes the pressure supply pipe 322. At this time, the valve on the pole-mounted circuit breaker is in an open state, and the first valve 23 on the gas storage bottle 2 is in a closed state. The controller 11 starts the air pump 3, and the air pump 3 extracts SF6 gas at the pole-mounted circuit breaker through the exhaust pipe 311, the connector 6 and the connecting pipe 62, and at the same time extracts air in the charging pipe 22 through the exhaust pipe 311, the connector 6 and the charging pipe 22. The air pump 3 extracts the SF6 gas at the pole-mounted circuit breaker and the air at the charging pipe 22 into the recovery bottle 4 for unified recovery. In this process, the controller 11 can control the start and stop of the air pump 3 through the air pressure information sensed by the air pressure sensor 61, so as to realize the exhaust work before SF6 gas replenishment;

[0041] S2: After step S1 is completed, the controller 11 drives the air intake three-way solenoid valve 31 to close the air extraction pipe 311, and closes the air pump 3, and then opens the first valve 23, and the gas cylinder 2 is filled with SF6 gas to the column circuit breaker via the charging pipe 22, the connector 6 and the connecting pipe 62. During this process, the staff can operate the controller 11 through the internal air pressure information of the gas cylinder 2 indicated by the pressure gauge 21, and start the air intake three-way solenoid valve 31, the air pump 3 and the air outlet three-way solenoid valve 32 in the form of a button switch on the controller 11. The air intake three-way solenoid valve 31 connects the air suction pipe 312 with the air pump 3 and keeps the air extraction pipe 311 closed. The air outlet three-way solenoid valve 32 connects the pressure supply pipe 322 with the air pump 3 and closes the gas storage pipe 321. The air pump 3 extracts the gas at the recovery bottle 4 through the air intake pipe 312 and guides it to the pressure supply mechanism 5 through the pressure supply pipe 322 to supplement the pressure of the gas in the gas cylinder 2.

[0042] S3: After step S2 is completed, first close the valve on the column circuit breaker and the first valve 23 on the gas storage bottle 2, start the air intake three-way solenoid valve 31, the air pump 3 and the air outlet three-way solenoid valve 32 through the controller 11, the air intake three-way solenoid valve 31 connects the air extraction pipe 311 with the air pump 3 and closes the air suction pipe 312, the air outlet three-way solenoid valve 32 connects the gas storage pipe 321 with the air pump 3 and closes the pressure supply pipe 322, the air pump 3 extracts the residual SF6 gas at the connecting pipe 62, the connecting head 6 and the charging pipe 22 through the air extraction pipe 311 and guides it to the recovery bottle 4 through the gas storage pipe 321, so as to achieve the residual SF6 gas The recovery work of the body is carried out. During this process, the controller 11 determines whether the residual SF6 gas is completely collected according to the pressure information detected by the air pressure sensor 61. When the air pressure sensor 61 detects that the connecting pipe 62, the connecting head 6 and the charging pipe 22 are in a vacuum state, the controller 11 starts the air intake three-way solenoid valve 31 and closes the air pump 3. The air intake three-way solenoid valve 31 closes the exhaust pipe 311, and then manually opens the air supply valve 63 on the connecting head 6 to connect the external air with the connecting pipe 62, the connecting head 6 and the charging pipe 22 to achieve the effect of balancing the air pressure, which is convenient for disassembling the connecting pipe 62 and the column circuit breaker.

[0043] The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the above technical content without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention belong to the protection scope of the present technical solution.

Claims

1. An inflator for SF6 column mounted circuit breaker, characterized in that: The invention comprises a mounting frame, a gas cylinder with a pressure gauge, an air pump, a recovery bottle and a controller, wherein the air pump, the gas cylinder, the recovery bottle and the controller are all arranged on the mounting frame, the gas cylinder is provided with an inflating tube, a first valve is provided at the connection between the gas cylinder and the inflating tube, a pressure supply mechanism capable of compressing the gas inside the gas cylinder is provided inside the gas cylinder, an inlet three-way solenoid valve is provided at the inlet end of the air pump, an outlet three-way solenoid valve is provided at the outlet end of the air pump, an air extraction pipe and an air suction pipe are provided on the inlet three-way solenoid valve, a connector is provided on the air extraction pipe, and an air pressure sensor is provided on the connector. a device and a connecting pipe detachably connected to the column-mounted circuit breaker, the connecting head is used to connect the exhaust pipe, the connecting pipe and the charging pipe, the connecting pipe is provided with a self-locking component that can automatically block the connecting pipe, an air supply valve is provided at the connecting head, the air suction pipe is connected to the recovery bottle, the air outlet three-way solenoid valve is connected to an air storage pipe and a pressure supply pipe, the pressure supply pipe is connected to the pressure supply mechanism and can provide air pressure to the pressure supply mechanism, the air storage pipe is connected to the recovery bottle, and the controller is electrically connected to the air inlet three-way solenoid valve, the air outlet three-way solenoid valve and the air pump respectively; The pressure supply mechanism includes a partition and an air bag, wherein the partition is movably installed in the inner cavity of the gas cylinder and divides the inner cavity of the gas cylinder into an upper chamber and a lower chamber, wherein the upper chamber is used to contain SF6 gas, the air bag is arranged at the lower chamber, and the pressure supply pipe is connected to the air bag; A threaded sleeve is rotatably provided on the connecting pipe, and the threaded sleeve can be threadedly connected with the charging port of the pole-mounted circuit breaker to connect the connecting pipe to the pole-mounted circuit breaker; The self-locking assembly comprises a moving tube, an elastic member and a fixed sleeve, the fixed sleeve is provided with a slide groove for the moving tube to move through, the side wall at the bottom of the moving tube is provided with a communication port communicating with the inner cavity of the moving tube, the bottom of the moving tube is provided with a sealing disk for blocking the bottom of the moving tube and the slide groove, the elastic member can act on the sealing disk to make the sealing disk elastically abut against the fixed sleeve, and the outer wall at the top of the moving tube is provided with a pushing disk for the column-mounted circuit breaker to push against; The elastic member is a spring, and the spring is sleeved and arranged on the outer wall of the moving tube. The spring can push the pushing plate so that the sealing plate elastically abuts against the fixing sleeve.

2. The inflator for SF6 column mounted circuit breaker according to claim 1, characterized in that: The controller is provided with an indicator light and a voice prompt module.

3. The inflator for SF6 column mounted circuit breaker according to claim 1, characterized in that: The mounting frame is provided with a hand push frame and universal wheels.

4. A method for inflating an inflator for a SF6 column mounted circuit breaker according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1: Connect the connecting pipe to the pole-mounted circuit breaker. The controller connects the suction pipe to the air inlet end of the air pump through the air inlet three-way solenoid valve and closes the suction pipe. At the same time, the gas storage pipe is connected to the air outlet end of the air pump through the air outlet three-way valve and the pressure supply pipe is closed. At this time, the valve on the pole-mounted circuit breaker is in the open state, and the first valve on the gas storage bottle is in the closed state. The controller starts the air pump. The air pump extracts SF6 gas at the pole-mounted circuit breaker through the suction pipe, the connector and the connecting pipe. At the same time, it extracts air in the inflation pipe through the suction pipe, the connector and the inflation pipe. The air pump extracts the SF6 gas at the pole-mounted circuit breaker and the air at the inflation pipe into the recovery bottle for unified recovery. The controller controls the start and stop of the air pump through the air pressure information sensed by the air pressure sensor to realize the air extraction work before SF6 gas replenishment. S2: After step S1 is completed, the controller drives the air inlet three-way solenoid valve to close the air extraction pipe and the air pump, and then opens the first valve. The gas cylinder is charged with SF6 gas to the column circuit breaker through the charging pipe, the connector and the connecting pipe. The controller is operated by the internal air pressure information of the gas cylinder indicated by the pressure gauge. The air inlet three-way solenoid valve, the air pump and the air outlet three-way solenoid valve are started by a button switch on the controller. The air inlet three-way solenoid valve connects the air suction pipe with the air pump and keeps the air extraction pipe closed. The air outlet three-way solenoid valve connects the pressure supply pipe with the air pump and closes the air storage pipe. The air pump extracts the gas at the recovery bottle through the air suction pipe and guides it to the pressure supply mechanism through the pressure supply pipe to supplement the pressure of the gas in the gas cylinder. S3: After step S2 is completed, first close the valve on the pole circuit breaker and the first valve on the gas storage bottle, start the air inlet three-way solenoid valve, the air pump and the air outlet three-way solenoid valve through the controller, the air inlet three-way solenoid valve connects the air extraction pipe and the air pump and closes the air suction pipe, the air outlet three-way solenoid valve connects the gas storage pipe and the air pump and closes the pressure supply pipe, the air pump extracts the SF6 gas remaining in the connecting pipe, the connecting head and the gas charging pipe through the air extraction pipe and guides it to the recovery bottle through the gas storage pipe to realize the recovery of the residual SF6 gas, the controller determines whether the residual SF6 gas is completely collected according to the pressure information detected by the air pressure sensor, when the air pressure sensor detects that the connecting pipe, the connecting head and the gas charging pipe are in a vacuum state, the controller starts the air inlet three-way solenoid valve and closes the air pump, the air inlet three-way solenoid valve closes the air extraction pipe, and then manually opens the gas supply valve on the connecting head to connect the external air with the connecting pipe, the connecting head and the gas charging pipe to achieve the effect of balancing the air pressure, which is convenient for disassembling the connecting pipe and the pole circuit breaker.

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