A gas recovery device

Abstract

This utility model discloses a gas recovery device, relating to the field of gas recovery technology. It includes a housing, inside which a compressor pump, a recovery tank, and a nitrogen tank are fixedly installed. An L-shaped three-way ball valve is located on one side of the housing. One port of the L-shaped three-way ball valve is fixedly connected to an extraction pipe, and the other two ports are fixedly connected to connecting pipes. One connecting pipe connects to the nitrogen tank, and the other connecting pipe connects to the recovery tank via the compressor pump. A plug is fixedly installed at the other end of the extraction pipe. This gas recovery device, through the design of the L-shaped three-way ball valve, can flexibly switch between extraction and nitrogen injection pathways. By injecting nitrogen from the nitrogen tank into the chamber to be recovered, creating disturbance, and cooperating with multiple extraction cycles by the compressor pump, residual sulfur hexafluoride gas in narrow cavities and dead corners can be effectively removed, thereby significantly improving the sulfur hexafluoride recovery rate, avoiding the risk of gas overflow when the chamber is opened, and significantly reducing the health hazards to workers and the risk of air pollution.

Description

Technical Field

[0001] This utility model relates to the field of gas recovery technology, specifically a gas recovery device. Background Technology

[0002] Existing gas-insulated switchgear commonly uses sulfur hexafluoride (SF6) gas as an insulating and arc-quenching medium. When the gas-insulated switchgear is used for a long time or experiences a serious electrical fault, it is necessary to recover the SF6 gas inside the switchgear. However, when existing recovery devices extract SF6 gas from the gas chamber of the switchgear, due to dead angles in the internal pipes and valves or a single extraction path, SF6 gas tends to remain in narrow cavities, and low-pressure areas cannot be effectively captured. The recovery rate is generally below 95%. Even after the gas chamber of the switchgear is opened, a significant amount of SF6 gas and fluorides will still overflow, causing air pollution and endangering the personal safety of workers.

[0003] Therefore, it is necessary to propose a gas recovery device to solve the above problems. Utility Model Content

[0004] Technical problem to be solved: The purpose of this utility model is to provide a gas recovery device to solve the problem mentioned in the background art that the recovery rate of existing recovery devices is generally less than 95% when extracting sulfur hexafluoride gas from the gas chamber of the gas filling cabinet. When the gas chamber of the gas filling cabinet is opened, a lot of sulfur hexafluoride gas and fluorides will still overflow, which will not only cause air pollution, but also affect the personal safety of the staff.

[0005] Technical Solution: To achieve the above objectives, this utility model is implemented through the following technical solution: A gas recovery device includes a housing, in which a compressor pump, a recovery tank, and a nitrogen tank are fixedly installed. An L-shaped three-way ball valve is provided on one side of the housing. A suction pipe is fixedly installed on one port of the L-shaped three-way ball valve, and connecting pipes are fixedly installed on the other two ports. Both connecting pipes are fixedly connected to the housing. One connecting pipe is connected to the nitrogen tank, and the other connecting pipe is connected to the recovery tank via the compressor pump. A plug is fixedly installed at the other end of the suction pipe.

[0006] Preferably, the bottom of the box is fixedly equipped with multiple casters, which are evenly distributed along the center of the box.

[0007] Preferably, a partition is fixedly installed inside the housing, dividing the housing into upper and lower chambers. The compression pump is fixedly installed in the upper chamber, and the recovery tank and nitrogen tank are fixedly installed in the lower chamber. Two through holes are opened on the partition, and the outlets of the recovery tank and nitrogen tank are equipped with connecting hoses. The recovery tank is connected to the output end of the compression pump through the connecting hose, and the nitrogen tank is connected to the connecting pipe through the connecting hose.

[0008] Preferably, it also includes a restraint assembly, in which both the recovery tank and the nitrogen tank are fixedly installed inside the container.

[0009] Preferably, the restraint assembly includes a fixed plate fixedly installed inside the box. Two arc-shaped grooves are spaced apart along the length of the fixed plate. Each arc-shaped groove is provided with an elastic pull rope. Bolts are threaded to both sides of each arc-shaped groove. The two ends of the elastic pull rope are respectively sleeved on the bolts on the adjacent sides. The elastic pull rope and the corresponding arc-shaped groove together form an enclosed area. The recovery tank and the nitrogen tank are respectively set in the corresponding enclosed area.

[0010] Beneficial effects: Compared with the prior art, this utility model provides a gas recovery device with a unique structure and convenient use. Through the design of the L-shaped three-way ball valve, the gas extraction and nitrogen injection channels can be flexibly switched. By injecting nitrogen into the gas chamber to be recovered using a nitrogen tank to create disturbance, and with multiple gas extraction cycles using a compressor pump, residual sulfur hexafluoride in narrow cavities and dead corners can be effectively removed, thereby significantly improving the recovery rate of sulfur hexafluoride, avoiding the risk of gas overflow when the gas chamber is opened, and significantly reducing the health hazards to workers and the risk of air pollution. In addition, the design of the restraint structure and universal wheels not only enhances the mobility of the device, but also prevents the tank from shaking during equipment movement. Attached Figure Description

[0011] Figure 1 This is a three-dimensional front view schematic diagram of the structure of this utility model; Figure 2 This is a three-dimensional side view of the structure of this utility model; Figure 3 This is a cross-sectional schematic diagram of the structure of this utility model; Figure 4 This is a three-dimensional schematic diagram of the restraint component of this utility model.

[0012] In the diagram: 1. Box body; 2. Casters; 3. Partition; 4. Compressor pump; 5. Recovery tank; 6. Nitrogen tank; 7. Connecting hose; 8. Connecting pipe; 9. L-shaped three-way ball valve; 10. Suction pipe; 11. Plug; 12. Fixing plate; 13. Bolt; 14. Elastic pull rope. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Example 1: This Example 1 provides a gas recovery device, which is a direct improvement on an existing recovery device. It has a unique structure. Please refer to [link / reference]. Figure 1-4As shown, the device includes a housing 1, which is made of 304 stainless steel, providing excellent corrosion resistance and structural strength. Its preferred dimensions are 800mm × 600mm × 1000mm, ensuring sufficient installation space for the internal equipment while facilitating handling and operation by staff. Four casters 2 are fixedly installed at the bottom of the housing 1, evenly distributed along the four corners of the bottom surface of the housing 1. Each caster 2 is equipped with a braking device, enabling flexible movement of the device while ensuring stable placement during operation, effectively improving the portability and operational safety of the device.

[0015] A horizontally arranged partition 3 is fixedly installed inside the housing 1. The partition 3 has two through holes and is made of 5mm thick aluminum alloy. It is fixedly connected to the inner wall of the housing 1 by welding, dividing the housing 1 into two independent upper and lower chambers. This structural design is not only conducive to the classified arrangement of equipment, but also reduces mutual interference between equipment during operation. A compressor pump 4 is fixedly installed in the upper chamber. The compressor pump 4 is an explosion-proof gas compressor with a pumping rate of 20L / min and a maximum working pressure of 1.6MPa, which can meet the requirements of efficient recovery of sulfur hexafluoride gas. The compressor pump 4 is fixed to the partition 3 by a shockproof bracket, which can effectively reduce vibration and noise during operation.

[0016] The lower chamber is fixedly equipped with a recovery tank 5 and a nitrogen tank 6. The recovery tank 5 has a volume of 50L, is made of high-strength alloy steel, and has a design working pressure of 2.5MPa. It is used to store recovered sulfur hexafluoride gas. The nitrogen tank 6 has a volume of 30L and a rated working pressure of 15MPa. It is used to store high-pressure nitrogen. Both the recovery tank 5 and the nitrogen tank 6 are equipped with pressure gauges and safety valves. When the pressure inside the tank exceeds the set value, the safety valve will automatically open to release pressure and ensure safe use.

[0017] An L-shaped three-way ball valve 9 is installed on one side of the exterior of the housing 1. The valve body is made of brass, which has good sealing and corrosion resistance. One port of the L-shaped three-way ball valve 9 is fixedly installed with a suction pipe 10 through a flange. The suction pipe 10 is a pressure-resistant hose with a length of 5m for easy operation over long distances. The other two ports are fixedly installed with connecting pipes 8 through threaded connections. Both connecting pipes 8 are fixedly connected to the housing 1. The connecting pipes 8 are made of stainless steel. One connecting pipe 8 is directly connected to the outlet of the nitrogen tank 6 through a connecting hose 7, and the other connecting pipe 8 is connected to the input end of the compressor pump 4. The output end of the compressor pump 4 is connected to the inlet of the recovery tank 5 through the connecting hose 7. The other end of the suction pipe 10 is fixedly installed with a plug 11. The plug 11 adopts a standard interface that matches the gas filling port of the gas filling cabinet and is equipped with a sealing ring to ensure the sealing of the connection and prevent gas leakage.

[0018] Working principle: When the operator uses this device to recover sulfur hexafluoride gas in the gas chamber, first release the brake of the universal wheel 2, move the recovery device to the vicinity of the gas chamber to be recovered, and then lock the universal wheel 2 to ensure that the device is placed stably; then insert the plug 11 into the gas inlet of the gas chamber to ensure a tight connection. At this time, turn the handle of the L-shaped three-way ball valve 9 to connect the input end of the compressor pump 4 with the gas chamber of the gas chamber, and start the compressor pump 4 at the same time. The compressor pump 4 draws the sulfur hexafluoride gas in the gas chamber into the recovery tank 5 for storage.

[0019] When the pressure display on the compressor pump 4 detects that the pressure in the gas chamber has reached the preset threshold (usually 0.05 MPa), the alarm on the compressor pump 4 will sound automatically, indicating to the operator that most of the sulfur hexafluoride gas in the gas chamber has been recovered. At this time, the operator will turn the handle of the L-shaped three-way ball valve 9 again to switch the passage so that the nitrogen tank 6 is connected to the gas chamber. The nitrogen in the nitrogen tank 6 will flow into the gas chamber under pressure to flush the gas chamber. The pressure display on the nitrogen tank 6 will be observed. When the amount of injected nitrogen reaches 1.5 times the volume of the gas chamber, the valve of the nitrogen tank 6 will be closed.

[0020] Turn the L-type three-way ball valve 9 again to connect the input end of the compressor pump 4 with the gas chamber, and pump the mixture of nitrogen and residual sulfur hexafluoride gas in the gas chamber into the recovery tank 5. Repeat the above nitrogen flushing and gas recovery operation two to three times to thoroughly clean the sulfur hexafluoride gas and fluorides produced by electrolysis in the gas chamber. In addition, in actual use, two recovery tanks 5 can be set up. During recovery, the sulfur hexafluoride gas is uniformly recovered into one recovery tank 5, and the mixture of sulfur hexafluoride and nitrogen is recovered into another recovery tank 5, which facilitates the subsequent separation and purification of sulfur hexafluoride gas.

[0021] Through the aforementioned structural design and operating procedures, this solution not only achieves efficient recovery of sulfur hexafluoride gas, but also ensures thorough cleaning through multiple nitrogen rinsing processes, effectively avoiding air pollution caused by residual gas and harm to the health of workers. At the same time, the device's portability, operational safety, and structural stability have all been significantly improved, demonstrating high practical value and promising prospects for widespread application.

[0022] Example 2: The difference between Example 2 and Example 1 is as follows: Figure 3-4 As shown, to ensure the stability of the recovery tank 5 and the nitrogen tank 6 during movement and operation, the device also includes a restraint assembly; the restraint assembly includes a fixing plate 12 that is fixedly installed at the bottom of the box 1 by bolts. The fixing plate 12 is made of steel plate with a thickness of 8mm. Two arc-shaped grooves matching the shape of the tank are opened at intervals along its length on the fixing plate 12. The radius of the arc-shaped grooves is slightly larger than the outer diameter of the tank.

[0023] Each arc-shaped groove is equipped with an elastic pull rope 14. The elastic pull rope 14 is made of high-strength rubber and has good elasticity and wear resistance. Bolts 13 are threaded to both sides of each arc-shaped groove. The two ends of the elastic pull rope 14 are respectively sleeved on the bolts 13 on the adjacent sides. The elastic pull rope 14 and the corresponding arc-shaped groove together form an enclosed area. The recovery tank 5 and the nitrogen tank 6 are respectively set in the corresponding enclosed area. The tank body is firmly fixed by the elastic force of the elastic pull rope 14.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas recovery device, comprising a housing (1), characterized in that: The housing (1) is fixedly installed with a compressor pump (4), a recovery tank (5), and a nitrogen tank (6). An L-shaped three-way ball valve (9) is provided on one side of the housing (1). A suction pipe (10) is fixedly installed on one port of the L-shaped three-way ball valve (9), and connecting pipes (8) are fixedly installed on the other two ports. Both connecting pipes (8) are fixedly connected to the housing (1). One connecting pipe (8) is connected to the nitrogen tank (6), and the other connecting pipe (8) is connected to the recovery tank (5) via the compressor pump (4). A plug (11) is fixedly installed at the other end of the suction pipe (10).

2. A gas recovery device according to claim 1, characterised in that: The bottom of the box (1) is fixedly equipped with multiple casters (2), and the multiple casters (2) are evenly distributed along the center of the box (1).

3. A gas recovery device according to claim 1, wherein: The box (1) is fixedly installed with a partition (3), which divides the box (1) into upper and lower chambers. The compression pump (4) is fixedly installed in the upper chamber, and the recovery tank (5) and nitrogen tank (6) are fixedly installed in the lower chamber. Two through holes are opened on the partition (3). The outlets of the recovery tank (5) and nitrogen tank (6) are equipped with connecting hoses (7). The recovery tank (5) is connected to the output end of the compression pump (4) through the connecting hose (7), and the nitrogen tank (6) is connected to the connecting pipe (8) through the connecting hose (7).

4. A gas recovery device according to claim 1, wherein: It also includes a restraint assembly, and the recovery tank (5) and the nitrogen tank (6) are both fixedly installed inside the housing (1) by the restraint assembly.

5. A gas recovery device according to claim 4, wherein: The restraint assembly includes a fixed plate (12) fixedly installed inside the box (1). Two arc-shaped grooves are opened at intervals along the length of the fixed plate (12). Each arc-shaped groove is provided with an elastic pull rope (14). Bolts (13) are threaded to both sides of each arc-shaped groove. The two ends of the elastic pull rope (14) are respectively sleeved on the bolts (13) on the adjacent sides. The elastic pull rope (14) and the corresponding arc-shaped groove together form an enclosed area. The recovery tank (5) and the nitrogen tank (6) are respectively set in the corresponding enclosed area.

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