An SF6 vacuum filling device and its usage method

Abstract

This invention provides an SF6 vacuum filling device, comprising a frame, a vacuum pump for vacuuming, a gas cylinder for filling, and a piping assembly. The piping assembly is connected to several pipe joints via gas pipes. Each pipe joint includes an electrical connector for connecting to SF6 electrical equipment and a plug-in connector for connecting to the gas pipes. The electrical connectors and plug-in connectors are arranged in a one-to-one correspondence. Several plug-in connectors are pivotally connected to the frame. The frame also has a drilling mechanism for drilling holes in the plug-in connectors, including a tapping part that moves along the arrangement direction of the plug-in connectors. The plug-in connectors are in a drilling state and an installation state. The frame also has a driving mechanism that drives the plug-in connectors to rotate in the installation state, causing the plug-in connectors to be screwed onto the electrical connectors. This invention also relates to a method of using the SF6 vacuum filling device. This invention reduces manual assembly steps, lowers labor intensity, and improves work efficiency.

Description

Technical Field

[0001] This invention relates to the field of gas replacement technology, and particularly to an SF6 vacuum filling device. The invention also relates to a method of using the SF6 vacuum filling device. Background Technology

[0002] SF6 gas is a colorless, odorless, non-toxic, and non-flammable inert gas with excellent arc-cooling properties. It is particularly effective at cooling switchgear under the influence of high-temperature arcs, preventing the possibility of localized overheating. Furthermore, the insulating properties of SF6 gas far surpass those of traditional insulating media such as oil and air. Using it as an insulating medium to extinguish arcs generated during the breaking of high-voltage switches can significantly improve the reliability of equipment insulation and extend the service life of electrical equipment.

[0003] SF6 vacuum filling equipment has a wide range of applications, mainly used to regulate the SF6 gas content in the air, as well as to detect the concentration and temperature of SF6 gas. It can be used for the detection and control of harmful gases, pollutants, and water pollutants.

[0004] It can also be used for gas filling and testing of equipment such as transformers, cables, and generators in the power industry. It can also be used for gas filling and testing of high-voltage cables, low-voltage cables, high-voltage equipment, high-voltage transformers, busbars, and transformer oil. Furthermore, it can be used for gas filling and testing of high-voltage switchgear, transformers, and cables in the power industry.

[0005] Furthermore, SF6 vacuum filling equipment can also be used for the detection and control of parameters such as temperature, pressure, humidity, and SF6 gas concentration in the field of gas environment monitoring. It can also be used for the detection and monitoring of gas emissions, as well as the detection and control of air pollutants.

[0006] The basic working principle of SF6 gas vacuum filling equipment is based on the cryogenic liquefaction method. During recovery, the suction and compressibility of the compressor are used to draw SF6 gas at a certain pressure from the SF6 electrical equipment into the compressor and compress it to a higher pressure. At the same time, the low evaporation temperature of R22 refrigerant is used to cool the higher-temperature SF6 gas to the condensation temperature for liquefaction and storage. This process is continued until the SF6 compressors are connected in series and the final recovery pressure is reached.

[0007] During charging and discharging, a vacuum pump is first used to evacuate the SF6 electrical equipment (or cylinder) and connecting pipelines. Then, the pressure difference or the suction property of the compressor is used to create a certain pressure difference to charge the SF6 from the storage container into the SF6 electrical equipment until the required working pressure is reached. When bottling is required, the properties of R22 refrigerant are utilized to directly fill the liquefied SF6 into the cylinder.

[0008] Currently, all electrical equipment in operating substations with voltage levels of 35kV and above uses SF6 circuit breakers for breaking current. Meanwhile, due to space constraints, open-type equipment is gradually being replaced by fully enclosed switchgear. The large-scale deployment of SF6 electrical equipment has led to new problems: with increasing operating years and equipment aging, SF6 gas leaks occur, requiring frequent replenishment.

[0009] Furthermore, with the increasing number of manufacturers producing SF6 electrical equipment both domestically and internationally, there is a growing variety of equipment of different models and specifications. However, due to the lack of a unified standard for the gas replenishment interface of electrical equipment, manufacturers adhere to their own standards, resulting in a wide range of gas filling connectors and pipeline models. At the same time, external equipment such as SF6 gas detection instruments, vacuum devices, and SF6 recovery devices, which are used for the installation, testing, and maintenance of SF6 electrical equipment, also lack unified interface specifications and connection methods, leading to a chaotic and disorganized collection of various supporting pipes and connectors.

[0010] Therefore, due to the diverse range of connectors, adapters are often required to connect the pipeline to the inflation connector. However, since the inflation connector itself does not have a designated mounting point for the adapter, the connector must be further processed before the adapter can be attached. The other end of the adapter then connects to the SF6 vacuum inflation equipment. This setup not only increases manual operation steps and the workload for workers but also adds to the process and increases production costs. Furthermore, the different connector specifications lead to incomplete parts availability, making maintenance and repair difficult.

[0011] CN117053092B discloses an SF6 vacuum filling device, which extracts SF6 waste gas from electrical components and then fills them with SF6 after vacuuming to ensure stable operation of the electrical components. However, when extracting SF6 waste gas from different electrical components, different connectors need to be replaced, which increases the number of connector replacement steps and the workload.

[0012] Application CN202322889167.5 discloses a rapid charging and gas-exchange integrated device, belonging to the field of insulating gas charging and gas-exchange technology. The device includes a mobile housing with a base plate inside. A main pipe is mounted on the base plate, and several branch pipes are connected to the main pipe. Two of these branch pipes are connected to a dual-vortex driven rapid charging valve, while the remaining branch pipes are connected to self-sealing joints. Each branch pipe connects to a 10mm diameter pipe and a 5mm diameter pipe via the self-sealing joints. Valves are also installed on the branch pipes, and a pressure gauge is mounted on the surface of the mobile housing. This device can simultaneously meet the needs of two sulfur hexafluoride (SF6) devices for recovery, vacuuming, or charging without multiple disassembly and reassembly of joints, resulting in short processing time and high efficiency. However, this device uses branch pipes and self-sealing joints, requiring additional adapters to connect to different SF6 electrical equipment. This method increases costs, installation steps, and workload. Summary of the Invention

[0013] In view of this, the present invention aims to provide an SF6 vacuum inflation device and its usage method, so as to realize the rapid combination of inflation connectors of different equipment, improve work efficiency and reduce the burden on operators.

[0014] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0015] An SF6 vacuum pumping and filling device includes a frame, a vacuum pump for vacuuming mounted on the frame, a gas cylinder for filling, and a pipeline assembly connected to the vacuum pump and the gas cylinder.

[0016] The piping assembly is connected to several pipe joints via a gas pipe. The pipe joints include electrical joints for connecting to SF6 electrical equipment and plug-in joints for connecting to the gas pipe. The electrical joints and the plug-in joints are provided in a one-to-one correspondence.

[0017] A plurality of the aforementioned plug-in connectors are pivotally connected to the frame, and the frame is further provided with a drilling mechanism for drilling holes in the plug-in connectors, the drilling mechanism including a tapping part that moves along the arrangement direction of the plurality of plug-in connectors;

[0018] The plug connector is driven to rotate 90° to be in a drilling state and an installation state respectively. The frame is also provided with a driving mechanism that drives the plug connector to rotate in the installation state. The driving mechanism drives the plug connector to be screwed onto the electrical connector.

[0019] Furthermore, the frame is pivotally connected to a pivot shaft and a first drive unit for driving the pivot shaft to rotate;

[0020] A horizontal plate is connected above the pivot shaft. The horizontal plate is provided with several fixed plates extending vertically upward and several movable plates slidably connected to the horizontal plate. The fixed plates and the movable plates are arranged in a one-to-one correspondence.

[0021] The movable plate and the fixed plate form a defined space for clamping the plug connector. The movable plate is driven to move closer to or away from the fixed plate so that the plug connector is in a clamped or relaxed state.

[0022] Furthermore, a second drive unit is connected to one side of the horizontal plate, and a connecting rod is connected to the power output end of the second drive unit. The connecting rod is connected to several movable plates.

[0023] The horizontal plate is provided with a plurality of long grooves arranged along its own length direction, and the movable plate is provided with protrusions protruding into the long grooves. The second driving unit drives the movable plate to slide along the length direction of the horizontal plate, so as to expand or shrink the defined space.

[0024] Furthermore, the drilling mechanism also includes an auxiliary support connected to the frame, and a linear module disposed on the auxiliary support; the tapping part is connected to the movable end of the linear module;

[0025] The tapping part includes a third drive unit, a drill chuck disposed on the third drive unit, and a drill bit connected to the drill chuck. The third drive unit rotates to drive the drill chuck to rotate and drill the plug joint.

[0026] Furthermore, the driving mechanism is provided in a one-to-one correspondence with the plug-in connector. The driving mechanism includes a fourth driving part and a screw sleeve connected to the power output end of the fourth driving part. The screw sleeve has an inner hole and a rotating sleeve with a transmission connection is provided in the inner hole of the screw sleeve. Both the rotating sleeve and the screw sleeve are provided with matching spiral grooves, and steel balls are provided in the spiral grooves.

[0027] The inner diameter of the rotating sleeve is adapted to the outer diameter of one end of the plug connector.

[0028] Furthermore, the frame is provided with a plurality of spaced mounting plates, which are used to fix a plurality of electrical connectors;

[0029] Each of the mounting plates is provided with a pressure plate for securing the electrical connector.

[0030] Furthermore, the piping assembly includes several branch lines and a first shut-off valve disposed on each of the branch lines;

[0031] The outlet of the gas cylinder is connected to the pipeline assembly via an inflation pipeline, and a second shut-off valve is provided on the inflation pipeline.

[0032] Furthermore, a vacuum gauge and a third shut-off valve are connected to the air pipe.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] The SF6 vacuum filling and inflation device of this invention, by setting up several pipe joints and a tapping part for drilling and plugging joints, taps the plugs corresponding to different electrical connectors, so that the plugs can be connected to different electrical connectors. This avoids the need for additional connecting parts in the prior art, reduces manual assembly steps, lowers labor intensity, improves work efficiency, and saves costs due to the reduction of connecting parts. Furthermore, by setting up a drive mechanism, the plugs are automatically connected to the electrical connectors, and then the electrical connectors connected to the SF6 vacuum filling and inflation device are connected to the SF6 electrical equipment, increasing the connection efficiency and convenience between the SF6 vacuum filling and inflation device and the SF6 electrical equipment.

[0035] Furthermore, rotating the first drive unit by 90° allows the plug-in connector fixed to the horizontal plate to rotate by 90°, facilitating the drilling of internal threaded holes at the connection point between the plug-in connector and the electrical connector. This adapts to different thread specifications of electrical connectors, avoiding the need for additional adapters. The movable plate, fixed plate, and first drive unit also facilitate the fixing and loosening of the plug-in connector. This structure is simple to design and easy to implement and install. A second drive unit drives the connecting rod to slide along the length of the horizontal plate in multiple directions, further facilitating the tightening or loosening of the plug-in connector.

[0036] In addition, the driving mechanism is set up one-to-one with the plug-in connector. The fourth driving unit drives the screw sleeve to move towards the electrical connector. The screw sleeve drives the rotating sleeve to abut against the plug-in connector. When the plug-in connector is connected to the electrical connector, the fourth driving unit continues to push, causing the rotating sleeve to rotate relative to the screw sleeve and move axially. The rotating sleeve drives the plug-in connector to rotate and screw it to the electrical connector, thereby automatically connecting the plug-in connector to the electrical connector, reducing the labor intensity of the workers and improving the installation efficiency.

[0037] In this invention, the pressure plate and mounting plate are bolted together. The mounting plate has mounting holes formed to match the corresponding electrical connectors. When the electrical connector is inserted into the mounting holes, the pressure plate secures the connector. The first shut-off valve controls the opening and closing of the vacuuming pipeline, and the second shut-off valve controls the opening and closing of the inflation pipeline. The third shut-off valve controls the opening and closing of the gas pipe, enabling control of the pipeline between the SF6 electrical equipment and the SF6 vacuuming and inflation device, facilitating inspection and maintenance.

[0038] Another object of the present invention is to provide a method for using an SF6 vacuum pumping and inflation device, which employs the SF6 vacuum pumping and inflation device as described above, and includes a vacuuming step and an inflation step:

[0039] The vacuuming step includes:

[0040] Step 1: The first drive unit drives the plug connector to a drilling state, drills the plug connector through the drilling mechanism, and then drives the plug connector to an installation state, and drives the plug connector to be screwed and fixed to the electrical connector through the drive mechanism.

[0041] Step 2: Connect the pipeline assembly to the assembled pipeline connector through the air pipe, that is, connect the SF6 vacuum inflation device and the SF6 electrical equipment together, and close the inflation pipeline.

[0042] Before vacuuming, check if the oil level in the vacuum pump is at the center of the oil level indicator. If it is low on oil, add the required amount. Plug in the power supply. This equipment uses a 380V three-phase 50Hz power supply. After powering on, observe if the green power indicator light is on. If it is not on, the phase sequence is incorrect. Move the phase sequence adjustment switch to position "1" or "2". If the green power indicator light illuminates, the phase sequence is correct. Then, briefly start the vacuum pump to check if its rotation direction matches the direction indicated on the pump. Confirm this again.

[0043] Step 3: Press the green vacuum button on the control panel to start the vacuum function;

[0044] Step 4: Evacuate the SF6 electrical equipment until a stable vacuum level is achieved;

[0045] Step 5: Once the required final vacuum level is reached, the equipment enters automatic mode.

[0046] Furthermore, the inflation step includes:

[0047] Step 1: After ensuring the SF6 vacuum pumping and charging device is connected to a vacuum, shut off the vacuum pump line;

[0048] Step 2: Connect the gas cylinder to the piping assembly;

[0049] Step 3: Open the gas cylinder, adjust the pipeline pressure, connect the filling pipeline, and refill with gas;

[0050] Step 4: When the required inflation pressure is reached, close the gas cylinder again and shut off all inflation lines to complete the refilling operation.

[0051] The SF6 vacuuming and inflation device of the present invention performs tapping on the plug-in connector through a tapping part, and connects and fixes the plug-in connector to the electrical connector through a drive mechanism. Then, the connected pipeline connector is fixed to the SF6 electrical equipment. The SF6 vacuuming and inflation device and the SF6 electrical equipment are connected together through an air pipe to perform vacuuming and inflation operations. This method can save the manual operation process of assembling pipelines in the prior art and improve work efficiency. Attached Figure Description

[0052] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0053] Figure 1 This is a three-dimensional structural diagram of the SF6 vacuuming and inflation device according to an embodiment of the present invention from a first perspective.

[0054] Figure 2 This is a two-dimensional structural diagram of the SF6 vacuum pumping and inflation device according to an embodiment of the present invention from a second perspective.

[0055] Figure 3 This is a left-side view of the SF6 vacuum filling device described in an embodiment of the present invention;

[0056] Figure 4 This is a top view schematic diagram of the SF6 vacuuming and inflation device according to an embodiment of the present invention;

[0057] Figure 5 This is a first-view perspective three-dimensional structural diagram of the SF6 vacuuming and inflation device according to an embodiment of the present invention, excluding electrical connectors.

[0058] Figure 6 This is a second-view perspective three-dimensional structural diagram of the SF6 vacuuming and inflation device according to an embodiment of the present invention, excluding electrical connectors.

[0059] Figure 7 This is a cross-sectional schematic diagram of the driving mechanism and the plug-in connector as described in an embodiment of the present invention;

[0060] Figure 8 This is a simplified diagram illustrating the working principle of the SF6 vacuuming and inflation device described in this embodiment of the invention.

[0061] Explanation of reference numerals in the attached figures:

[0062] 1. Frame; 2. Vacuum pump; 3. Gas cylinder; 4. Piping assembly; 5. Electrical connector; 6. Plug connector; 7. Drilling mechanism; 8. Tapping part; 9. Drive mechanism; 10. Pivot shaft; 11. First drive unit; 12. Horizontal plate; 13. Fixed plate; 14. Movable plate; 15. Second drive unit; 16. Connecting rod; 17. Mounting plate; 18. Pressure plate; 19. First shut-off valve;

[0063] 401. Branch road;

[0064] 701. Auxiliary support; 702. Linear module;

[0065] 801. Third drive unit; 802. Drill chuck; 803. Drill bit;

[0066] 901, Fourth drive unit; 902, Screw sleeve; 903, Rotating sleeve; 904, Spiral groove; 905, Steel ball. Detailed Implementation

[0067] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0068] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "back," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0069] Furthermore, in the description of this invention, unless otherwise explicitly defined, the terms "installation," "connection," "linking," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0070] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0071] This embodiment relates to an SF6 vacuum pumping and filling device. The device includes a frame, a vacuum pump mounted on the frame for vacuuming, a gas cylinder for filling, and a piping assembly connected to the vacuum pump and the gas cylinder. The piping assembly is connected to several pipe joints via gas pipes. The pipe joints include electrical connectors for connecting to SF6 electrical equipment and plug-in connectors for connecting to the gas pipes. The electrical connectors and plug-in connectors are arranged in a one-to-one correspondence.

[0072] Several plug-in connectors are pivotally connected to the frame, which is also equipped with a drilling mechanism for drilling holes in the plug-in connectors. The drilling mechanism includes a tapping part that moves along the arrangement direction of the plug-in connectors. The plug-in connectors are driven to rotate 90° to be in a drilling state and an installation state, respectively. The frame is also equipped with a driving mechanism that drives the plug-in connectors to rotate in the installation state, and the driving mechanism drives the plug-in connectors to be screwed onto the electrical connectors.

[0073] The SF6 vacuum filling and inflation device of this embodiment features several pipe joints and a tapping part for drilling and threading the plug-in joints. This tapping process corresponds to different electrical connectors, allowing the plug-in joints to connect with different electrical connectors. This avoids the need for additional connecting parts in existing technologies, reduces manual assembly steps, lowers labor intensity, improves work efficiency, and saves costs due to the reduced number of connecting parts. Furthermore, a drive mechanism automatically connects the plug-in joints to the electrical connectors, and then the electrical connectors connected to the SF6 vacuum filling and inflation device are connected to the SF6 electrical equipment, increasing the efficiency and convenience of the connection between the SF6 vacuum filling and inflation device and the SF6 electrical equipment.

[0074] Based on the above overall description, an exemplary structure of the SF6 vacuum filling device in this embodiment is as follows: Figures 1 to 4 As shown, the frame in this embodiment is a frame welded from rectangular steel pipes. The vacuum pump and gas cylinder are mounted on the frame. The outlet end of the vacuum pump is connected to an outlet pipe, which communicates with the inlet of the piping assembly. The piping assembly in this embodiment includes a main pipeline and six branch pipelines connected to the main pipeline. The ends of the branch pipelines are connected to connectors via gas pipes.

[0075] As a preferred embodiment, such as Figures 1 to 6 As shown, the frame is pivotally connected to a pivot shaft and a first drive unit for rotating the pivot shaft. A horizontal plate is connected above the pivot shaft. The horizontal plate has several vertically extending fixed plates and several movable plates slidably connected to the horizontal plate, with each fixed plate corresponding to one of the movable plates. The movable plates and fixed plates enclose a defined space for clamping the connector. The movable plates are driven closer to or further away from the fixed plates to clamp or relax the connector.

[0076] like Figures 5 to 6As shown, the first drive unit uses a drive motor, which is fixedly connected to the side of the frame, and the power output shaft of the drive motor is keyed to the pivot shaft. By rotating the first drive unit 90°, the plug-in connector fixed on the horizontal plate can be rotated 90°, which facilitates drilling internal threaded holes at the connection position between the plug-in connector and the electrical connector to accommodate different thread specifications of electrical connectors and avoid the need for additional adapters.

[0077] In addition, by setting up a movable plate and a fixed plate, as well as a first drive unit, it is easy to fix and loosen the plug-in connector. The structure is simple to set up and easy to implement and install.

[0078] Furthermore, such as Figures 5 to 6 As shown, a second drive unit is connected to one side of the horizontal plate. The power output end of the second drive unit is connected to a connecting rod, which is connected to several movable plates. The horizontal plate has several long slots arranged along its own length direction, and the movable plates have protrusions protruding into the long slots. The second drive unit drives the movable plates to slide along the length direction of the horizontal plate, so as to expand or shrink the defined space.

[0079] like Figure 5 As shown, the second drive unit in this embodiment uses a telescopic cylinder. The fixed plate is a rectangular plate structure, bolted to the horizontal plate. The movable plate has the same shape as the fixed plate, and the number of fixed plates and movable plates corresponds one-to-one with the number of plug-in connectors. The defined space between the fixed plate and the movable plate corresponds to the air outlet of the branch pipeline. In this embodiment, the protrusion is a rectangular structure, formed below the movable plate, and the long groove (not shown in the figure) is correspondingly set to the protrusion. By setting the second drive unit, the connecting rod is driven to slide along the length of the horizontal plate in one direction, so as to tighten or loosen the plug-in connector.

[0080] As one specific implementation method, such as Figures 1 to 6 As shown, the drilling mechanism also includes an auxiliary support connected to the frame, and a linear module mounted on the auxiliary support; the tapping section is connected to the movable end of the linear module. The tapping section includes a third drive unit, a drill chuck mounted on the third drive unit, and a drill bit connected to the drill chuck. The rotation of the third drive unit drives the drill chuck to rotate and rotate the drill bit to drill the plug joint.

[0081] As Figures 1 to 6 As shown, the third drive unit uses a rotary motor. Since most of the electrical connectors for SF6 electrical equipment are one of the six types shown in the figure, electrical connectors with the same thread specification are placed in adjacent positions to facilitate tapping by the drilling mechanism. When different thread specifications need to be processed, the drill bit can be changed manually. Alternatively, multiple movable ends can be set on the linear module, and different tapping parts can be set on different movable ends to achieve fully automatic operation.

[0082] Preferably, such as Figures 1 to 7As shown, the driving mechanism and the plug-in connector are arranged in a one-to-one correspondence. The driving mechanism includes a fourth driving part and a threaded sleeve connected to the power output end of the fourth driving part. The threaded sleeve has an inner hole, and a rotating sleeve with a transmission connection is provided in the inner hole of the threaded sleeve. Both the rotating sleeve and the threaded sleeve have matching spiral grooves, and steel balls are provided in the spiral grooves. The inner diameter of the rotating sleeve is adapted to the outer diameter of one end of the plug-in connector.

[0083] The fourth drive unit uses a telescopic cylinder, with each drive mechanism corresponding to a plug-in connector. The fourth drive unit drives the threaded sleeve to move closer to the electrical connector. The threaded sleeve drives the rotating sleeve to abut against the plug-in connector. When the plug-in connector is connected to the electrical connector, the fourth drive unit continues to push, causing the rotating sleeve to rotate relative to the threaded sleeve while simultaneously displacing axially. The rotating sleeve drives the plug-in connector to rotate and screw it into the electrical connector, thus automatically connecting the plug-in connector to the electrical connector, reducing the labor intensity of workers and improving installation efficiency.

[0084] In addition, such as Figures 5 to 6 As shown, the frame is provided with several spaced mounting plates for fixing several electrical connectors. Each mounting plate is provided with a pressure plate for fastening the electrical connectors. In this embodiment, the pressure plate is bolted to the mounting plate, and the mounting plate is formed with mounting holes adapted to the corresponding electrical connectors. When the electrical connector is inserted into the mounting hole, the pressure plate fixes the electrical connector.

[0085] Preferably, such as Figures 1 to 4 As shown, the piping assembly includes several branch lines and a first shut-off valve located on each branch line. The outlet of the gas cylinder is connected to the piping assembly via a filling line, which is equipped with a second shut-off valve. The first shut-off valve controls the opening and closing of the vacuuming line, and the second shut-off valve controls the opening and closing of the filling line.

[0086] Furthermore, a vacuum gauge and a third shut-off valve are connected to the gas pipe. By controlling the third shut-off valve, the opening and closing of the gas pipe can be controlled, allowing for the opening and closing of the pipeline between the SF6 electrical equipment and the SF6 vacuuming and charging device, facilitating inspection or maintenance.

[0087] It should be noted that, such as Figures 1 to 7 As shown, electrical connectors 5 mainly include SF6 filling connectors, SF6 adapters, and SF6 transition adapters. These connectors are specifically designed for the filling, sampling, recovery, and vacuuming of SF6 electrical equipment, meeting the needs of imported and domestic electrical equipment of different voltage levels. They are suitable for vacuuming, SF6 recovery, and filling connectors of various SF6 electrical equipment, and for on-site verification of various specifications of imported and domestic SF6 switches, GIS, and SF6 density relays. Furthermore, these connectors are also suitable for various imported and domestic micro-moisture testing transition connectors, ensuring the testing accuracy and service life of the equipment.

[0088] SF6 inflation connector: An auxiliary accessory mainly used for inflation, sampling, recovery, and vacuuming of SF6 electrical equipment, meeting the needs of imported and domestic electrical equipment of different voltage levels. Available in copper or stainless steel components, suitable for SF6 electrical equipment from various manufacturers.

[0089] SF6 adapters and SF6 transition adapters: Suitable for the installation of various SF6 circuit breakers, simple and convenient to operate, and compatible with various specifications of imported and domestic SF6 switches and GIS adapters. These adapters can filter out particulate impurities as small as 5 microns, purifying the gas source and ensuring the testing accuracy and service life of the equipment.

[0090] The application of these connectors not only improves the working efficiency of SF6 electrical equipment but also ensures its safe operation. The supplier offers products including, but not limited to, copper and aluminum GIS adapters and filter conversion devices to meet the needs of different users. Furthermore, these connectors can be customized with non-standard accessories according to user requirements, further satisfying the diverse needs of the market.

[0091] In addition, the lower end of the vacuum pump of the SF6 vacuum pumping and charging device in this embodiment is also equipped with a compressor. The main functions of the compressor and the vacuum pump are to remove non-condensable gases and moisture from the system and to prepare for the charging of the system with refrigerating SF6 gas.

[0092] The compressor and vacuum pump in the SF6 vacuum pumping and charging device play a crucial role in power equipment and refrigeration systems. In power equipment, the device extracts high-pressure SF6 gas using the vacuum pump, then recirculates and purifies the gas back into the equipment via a circulation pump, ensuring it meets the purity requirements of high-voltage power equipment. Furthermore, the device includes dryers and filters to effectively remove moisture and impurities from the SF6, thereby improving its purity and quality. Finally, the device also features a charging function, allowing the purified SF6 gas to be reinjected into the high-voltage power equipment, ensuring the stable operation and safety of the power system.

[0093] In refrigeration systems, the SF6 gas vacuuming and charging device serves to remove non-condensable gases and moisture from the system. The presence of non-condensable gases increases the system's condensing pressure and exhaust temperature, affecting refrigeration performance. Moisture, on the other hand, is a major problem in refrigeration systems, causing lubricating oil to react with moisture to form acid, corroding the system, causing "copper plating," and damaging the compressor. Therefore, the vacuuming and charging device, using a vacuum pump system, performs a vacuuming operation to further check the system's airtightness and remove air, moisture, and other non-condensable gases, preparing the system for the charging of SF6 refrigeration gas.

[0094] The compressor of the SF6 vacuum filling device in this embodiment is mainly used for the recovery, filling, purification, vacuuming and storage of SF6 gas.

[0095] The compressor in the SF6 vacuum filling and charging device plays a crucial role in operation, and its specific functions are as follows:

[0096] Recovery function: Utilizing the suction and compressibility of the compressor, SF6 gas at a certain pressure inside the SF6 electrical equipment is drawn into the compressor and compressed to a higher pressure for liquefaction and storage.

[0097] Charge and discharge function: First, the vacuum pump of the device is used to evacuate the SF6 electrical equipment (or cylinder) and connecting pipeline. Then, the SF6 in the storage container of the device is charged into the SF6 electrical equipment directly by using the pressure difference or by using the suction of the compressor to create a certain pressure difference until the required working pressure is reached.

[0098] Purification Function: During the recovery and charging / discharging processes, the system is equipped with an oil separator and a dryer filter to effectively remove oil and moisture carried by the SF6 gas. The filter is equipped with a heating regeneration device, which can be regenerated under vacuum, allowing the molecular sieve to be reused repeatedly and ensuring the purity of the SF6 entering the storage container.

[0099] Vacuuming function: The use of the compressor also involves vacuuming and measuring the SF6 electrical components to ensure the airtightness and purity of the system.

[0100] Storage function: The recovered SF6 gas is compressed and stored in the storage container of the device through the compression action of the compressor, so that it can be used later or refilled into electrical equipment.

[0101] In summary, the compressor of the SF6 vacuum filling device, through its functions of recovery, filling, purification, vacuuming, and storage, ensures the effective management and reuse of SF6 gas, while also guaranteeing the normal operation and safety of electrical equipment.

[0102] The SF6 vacuum filling and inflation device described in this embodiment features several pipe joints and a tapping part for drilling and tapping the plug-in joints. This tapping process corresponds to different electrical connectors, allowing the plug-in joints to connect with the corresponding electrical connectors. Furthermore, a drive mechanism enables the plug-in joints to automatically connect with the electrical connectors. This avoids the need for additional connecting parts in existing technologies, reduces manual assembly steps, improves work efficiency, saves costs, and increases the efficiency and convenience of connecting the SF6 vacuum filling and inflation device with SF6 electrical equipment.

[0103] This embodiment also relates to a method of using an SF6 vacuum filling device, such as... Figure 8As shown, this method of use employs the SF6 vacuuming and inflation device described above, which includes a vacuuming step and an inflation step:

[0104] The vacuuming step includes:

[0105] Step 1: Drive the plug connector to the drilling state, drill the plug connector through the drilling mechanism, then drive the plug connector to the installation state, and drive the plug connector to be screwed and fixed to the electrical connector through the driving mechanism.

[0106] Step 2: Connect the pipeline assembly to the assembled pipeline connector through the air pipe, that is, connect the SF6 vacuum inflation device and the SF6 electrical equipment together, and close the inflation pipeline through the second shut-off valve.

[0107] Before vacuuming, check if the oil level in the vacuum pump is at the center of the oil level indicator. If it is low on oil, add the required amount. Plug in the power supply. This equipment uses a 380V three-phase 50Hz power supply. After powering on, observe if the green power indicator light is on. If it is not on, the phase sequence is incorrect. Move the phase sequence adjustment switch to position "1" or "2". If the green power indicator light illuminates, the phase sequence is correct. Then, briefly start the vacuum pump to check if its rotation direction matches the direction indicated on the pump. Confirm this again.

[0108] Step 3: Unscrew the bypass plug of the exhaust valve to open the bypass channel, connect the vacuum pump, open the first shut-off valve, press the green vacuum button on the control panel to start the vacuum function;

[0109] Vacuum the SF6 electrical equipment (assuming the pipeline is well sealed; if there are leaks in the pipeline, check and eliminate them).

[0110] During vacuum pump operation, the exhaust valve is responsible for releasing or regulating the pressure inside the system. When the pressure inside the system gradually decreases, forming a vacuum, if the pressure cannot be effectively released, it may negatively impact pump performance or even damage the pump's internal structure. The function of the exhaust valve is to automatically open when the pressure reaches a certain value, releasing excess gas and preventing damage to the pump due to excessive pressure. Furthermore, the exhaust valve can also regulate pressure. By adjusting the valve opening, the system's exhaust volume and speed can be controlled, thereby affecting the pump's efficiency and the system's pressure state. This regulatory function not only improves pump efficiency but also allows for flexible adjustment of system pressure according to actual working needs, meeting different operational requirements.

[0111] Start the vacuum pump to evacuate the air. It is difficult to remove all the air from the system. In order to achieve a certain degree of vacuum, the evacuation should be performed in several stages with an interval of about 10 minutes to allow the pressure in the system to be balanced.

[0112] The main function of the exhaust valve of the vacuum pump is to regulate the pressure inside the system, ensuring the normal operation of the pump and the safety of the system.

[0113] Step 4: Evacuate the SF6 electrical equipment until a stable vacuum is reached;

[0114] After the vacuum level meets the standard, first close the bypass channel, then stop the vacuum pump, remove the suction pipe, and screw on the plug of the bypass hole of the exhaust valve;

[0115] After evacuation, it should be maintained for 24 hours. If the pressure increase in the system does not exceed 666.61 Pa, it is considered qualified. If the pressure rises rapidly, the cause should be promptly identified and eliminated;

[0116] [[ID=I12]]Step 5: After reaching the required final vacuum level, the equipment enters the automatic state. In this embodiment, it is set to enter the timing state when the vacuum level is below 30 Pa. When the timing ends, the machine stops, and it automatically starts when the vacuum level rises back to 200 Pa.

[0117] This process involves the standard operations of evacuating the gas chamber and checking its airtightness. When there is no clear specification from the manufacturer, the common practice is to evacuate the gas chamber to below 133 Pa and continue evacuation for 30 minutes. Then, stop the evacuation and wait for 30 minutes, and record the vacuum level (A) at this time. After that, wait for another 5 hours and read the vacuum level again as (B). If the difference between (B) and (A) is less than 133 Pa, the airtightness of the gas chamber is considered qualified. This process ensures that the gas chamber maintains a stable low-vacuum state over a long period, thus verifying whether its sealing performance meets the standard.

[0118] Table 1 shows the detection values of the evacuation time and the evacuation volume

[0119]

[0120] In Table 1, when the evacuation times are 2 hours, 4 hours, 12 hours, 20 hours, 40 hours, and 80 hours, the measured evacuation volumes are 30 L, 60 L, 180 L, 300 L, 600 L, and 1200 L respectively.

[0121] It should be noted that during evacuation:

[0122] First, before starting the vacuum pump for evacuation, decide whether to connect the pipeline for discharge to the outside according to the need;

[0123] Second, before starting the vacuum pump for evacuation, it must be ensured that the pressure of the device or system to be evacuated is at zero gauge pressure or below;

[0124] The SF6 compressor cannot be started under the vacuum holding state.

[0125] The gas filling steps include:

[0126] Step 1: After ensuring that the SF6 vacuum pumping and charging device is connected to a vacuum, shut off the vacuum pump 2 pipeline;

[0127] Step 2: Connect gas cylinder 3 to pipeline assembly 4;

[0128] Ensure that the humidity of the working environment does not exceed 80% and the temperature is not lower than 5℃. Avoid working on rainy days, after rain, before dew forms in the morning, or after atomization in the evening.

[0129] Consult the SF6 gas temperature-pressure curve to find the pressure value corresponding to the current temperature;

[0130] Step 3: Open gas cylinder 3, adjust the pressure of the filling line through the pressure reducing valve, connect the filling line, and refill with gas.

[0131] Connect the gas filling pipeline and pressure reducing valve. Slowly open the pressure reducing valve to fill the circuit breaker with gas, being careful to avoid excessive gas pressure.

[0132] When the gas in the circuit breaker reaches the rated pressure, close the pressure reducing valve, disconnect the charging pipe, and tighten the connection.

[0133] Inflation should be performed slowly to avoid a sudden drop in temperature of the inflation tubing, connectors, and inflation device, which could cause frost to form on the surface and the rubber hose to harden.

[0134] Step 4: When the required inflation pressure is reached, close cylinder 3 again through the second shut-off valve, shut off all inflation lines, and complete the refilling operation;

[0135] During inflation, it is necessary to ensure that the gas is added at a uniform rate, neither too quickly nor too slowly;

[0136] After inflation is complete, remove excess gas using the vent valve;

[0137] Check the moisture content of sulfur hexafluoride gas inside the circuit breaker to ensure it meets the specified requirements;

[0138] Record the temperature, humidity, and sulfur hexafluoride pressure values ​​for the day, so that they can be observed and compared later.

[0139] The method of using the SF6 vacuuming and inflation device in this embodiment involves tapping the plug-in connector 6 with the tapping part 8, connecting and fixing the plug-in connector 6 to the electrical connector 5 through the drive mechanism, and then fixing the connected pipeline connector to the SF6 electrical equipment. The SF6 vacuuming and inflation device and the SF6 electrical equipment are connected together through the air pipe to perform vacuuming and inflation operations. This method can save the manual operation process of assembling pipelines in the prior art and improve work efficiency.

[0140] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An SF6 evacuation and gas filling device, characterized by: The SF6 vacuum pumping and air charging device comprises a rack (1), a vacuum pump (2) arranged on the rack (1) for vacuum pumping, an air cylinder (3) for air charging, and a pipeline assembly (4) in pipeline communication with the vacuum pump (2) and the air cylinder (3); the pipeline assembly (4) is connected with a plurality of pipeline joints through an air pipe, the pipeline joints comprise electrical joints (5) connected with SF6 electrical equipment, and plug-in joints (6) connected with the air pipe, the electrical joints (5) and the plug-in joints (6) are arranged one by one in a one-to-one correspondence; a plurality of the plug-in joints (6) are pivotally connected to the rack (1), and a drilling mechanism (7) for drilling the plug-in joints (6) is further arranged on the rack (1), the drilling mechanism (7) comprises a tapping part (8) moving along the arrangement direction of the plug-in joints (6); the plug-in joints (6) are driven to rotate by 90° to be in a drilling state and an installation state respectively, and a driving mechanism (9) for driving the plug-in joints (6) to rotate in the installation state is further arranged on the rack (1), and the driving mechanism (9) drives the plug-in joints (6) to be screwed on the electrical joints (5).

2. The SF6 vacuum pumping and air charging device according to claim 1, characterized in that: the rack (1) is pivotally connected with a pivot shaft (10) and a first driving part (11) for driving the pivot shaft (10) to rotate; a horizontal plate (12) is connected above the pivot shaft (10), a plurality of fixed plates (13) extending vertically upward are arranged on the horizontal plate (12), and a plurality of movable plates (14) slidably connected to the horizontal plate (12) are arranged, the fixed plates (13) and the movable plates (14) are arranged one by one in a one-to-one correspondence; a defined space for clamping the plug-in joints (6) is formed between the movable plates (14) and the fixed plates (13), and the movable plates (14) are driven to approach or move away from the fixed plates (13) to make the plug-in joints (6) in a clamped state or a relaxed state.

3. The SF6 vacuum pumping and air charging device according to claim 2, characterized in that: a second driving part (15) is connected on one side of the horizontal plate (12), a connecting rod (16) is connected to the power output end of the second driving part (15), and the connecting rod (16) is connected with a plurality of movable plates (14); a plurality of long grooves are arranged on the horizontal plate (12) along the length direction of the horizontal plate (12), and protrusions are arranged on the movable plates (14) and protrude into the long grooves, and the second driving part (15) drives the movable plates (14) to slide along the length direction of the horizontal plate (12) to make the defined space expand or shrink.

4. The SF6 vacuum pumping and air charging device according to claim 3, characterized in that: the drilling mechanism (7) further comprises an auxiliary support (701) connected to the rack (1), and a linear module (702) arranged on the auxiliary support (701); and the tapping part (8) is connected to the movable end of the linear module (702). The tapping part (8) comprises a third driving part (801), a drill chuck (802) arranged on the third driving part (801), and a drill bit (803) connected to the drill chuck (802), and the third driving part (801) rotates to drive the drill chuck (802) to rotate the drill bit (803) to drill the plug joint (6). 5.The SF6 vacuumizing and gas charging device according to claim 4, wherein: The driving mechanism (9) is arranged in one-to-one correspondence with the plug joint (6), the driving mechanism (9) comprises a fourth driving part (901), a sleeve (902) connected to the power output end of the fourth driving part (901), the sleeve (902) has an inner hole, the sleeve (902) is provided with a rotating sleeve (903) in transmission connection, the rotating sleeve (903) and the sleeve (902) are both provided with a spiral groove (904) matched thereon, and the spiral groove (904) is provided with a steel ball (905) therein. The inner diameter of the rotating sleeve (903) is matched with the outer diameter of one end of the plug joint (6). 6.The SF6 vacuumizing and gas charging device according to claim 5, wherein: The rack (1) is provided with a plurality of installation plates (17) arranged at intervals, and the installation plates (17) are used for fixing a plurality of the electrical joints (5). Each installation plate (17) is provided with a pressing plate (18) used for fastening the electrical joint (5). 7.The SF6 vacuumizing and gas charging device according to claim 1, wherein: The pipeline assembly (4) comprises a plurality of branch pipelines (401), and a first stop valve (19) arranged on the branch pipeline (401); The gas outlet of the gas cylinder (3) is in communication with the pipeline assembly (4) through a gas charging pipeline, and the gas charging pipeline is provided with a second stop valve. 8.The SF6 vacuumizing and gas charging device according to claim 1, wherein: The gas pipe is connected with a vacuum gauge and a third stop valve. 9.A method for using an SF6 vacuumizing and gas charging device, comprising the steps of: The SF6 vacuumizing and gas charging device according to any one of claims 2 to 8 is used, and the method comprises a vacuumizing step and a gas charging step: The vacuumizing step comprises: First step: the first driving part (11) drives the plug joint (6) to a drilling state, drills the plug joint (6) through the drilling mechanism (7), and then drives the plug joint (6) to an installation state, and drives the plug joint (6) to be screwed and fixed with the electrical joint (5) through the driving mechanism (9); Second step: connect the pipeline assembly (4) with the assembled pipeline joint through the gas pipe, that is, connect the SF6 vacuumizing and gas charging device with the SF6 electrical equipment, and close the gas charging pipeline. Before vacuumizing, check the oil level of the vacuum pump, if the oil level is not in the center of the oil mark, add the required oil, plug in the power, the power supply of the equipment is 380V three-phase 50Hz, after power on, observe whether the power indicator green light is on, if not, adjust the phase sequence switch to "1" or "2" position, the power indicator green light is on, indicating that the phase sequence is correct, then start the vacuum pump, check whether the direction of the vacuum pump is consistent with the direction indicated by the vacuum pump, and confirm again; Third step: press the green vacuum button on the control panel to start the vacuum function; Fourth step: vacuumize the SF6 electrical equipment until a stable vacuum degree is reached; Fifth step: after reaching the required final vacuum degree, the equipment enters the automatic state.

10. The use method of the SF6 vacuumizing and gas charging device according to claim 9, characterized in that: the gas charging step comprises: First step: after ensuring that the SF6 vacuumizing and gas charging device is connected to the vacuum, close the vacuum pump (2) pipeline; Second step: connect the gas cylinder (3) to the pipeline assembly (4); Third step: open the gas cylinder (3), adjust the pipeline pressure, connect the gas charging pipeline, and recharge the gas; Fourth step: when the required gas charging pressure is reached, close the gas cylinder (3) again, close all the gas charging pipelines, and complete the recharging operation.

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