SF6 (sulfur hexafluoride) vacuumizing and inflating device and using method thereof

Abstract

The invention provides an SF6 vacuumizing and inflating device. The SF6 vacuumizing and inflating device comprises a rack, a vacuum pump for vacuumizing, a gas cylinder for inflating and a pipeline assembly, the pipeline assembly is connected with a plurality of pipeline connectors through gas pipes, the pipeline connectors comprise electric appliance connectors connected with SF6 electrical equipment and plug connectors connected with the gas pipes, and the electric appliance connectors and the plug connectors are arranged in a one-to-one correspondence mode; the plurality of plug connectors are pivotally connected to the rack, the rack is further provided with a drilling mechanism used for drilling the plug connectors, and the drilling mechanism comprises a tapping part moving in the arrangement direction of the plurality of plug connectors; the inserting connector is in a drilling state and an installation state, a driving mechanism for driving the inserting connector to rotate in the installation state is further arranged on the rack, and the driving mechanism drives the inserting connector to be in threaded connection with the electric appliance connector. The invention further relates to a using method of the SF6 vacuumizing and inflating device. The assembling process of manual operation is reduced, the labor intensity of workers is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of gas replacement technology, and in particular to an SF6 vacuuming and filling device. The present invention also relates to a method for using the SF6 vacuuming and filling device. Background Art

[0002] SF6 gas is a colorless, odorless, non-toxic, non-flammable inert gas with excellent arc cooling properties, especially when the switchgear is exposed to arc high temperatures, it produces a high cooling effect and avoids the possibility of local high temperatures. At the same time, the insulation performance of SF6 gas far exceeds that of traditional insulating media such as oil and air. Using it as an insulating medium to extinguish the arc generated during the high-voltage switch breaking process can greatly 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 adjust the SF6 gas content in the air, and detect the concentration and temperature of SF6 gas, etc. It can be used for the detection of harmful gases, the detection and control of pollutants, and the detection and control of water pollutants, etc.

[0004] It can also be used for the inflation of transformers, cables, generators and other equipment in the power industry, as well as the gas detection of transformers and cables and other equipment. It can also be used for the inflation and detection of high-voltage cables, low-voltage cables, high-voltage equipment, high-voltage transformers, busbars, transformer oil, etc. In addition, it can also be used for the inflation and detection of high-voltage switchgear, transformers, cables and other equipment in the power industry.

[0005] In addition, SF6 vacuum filling equipment can also be used to detect and control parameters such as temperature, pressure, humidity, SF6 gas concentration, etc. 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 to adopt the freezing liquefaction method. During recovery, the SF6 gas of a certain pressure in the SF6 electrical equipment is sucked into the compressor by the suction and compressibility of the compressor, and compressed to a higher pressure. At the same time, the low evaporation temperature characteristics of the R22 refrigerant are used to cool the high-temperature SF6 gas to the condensation temperature for liquefaction and storage. In this way, the SF6 compressor is continuously pumped in series until the final recovery pressure is reached.

[0007] When charging and discharging, first use a vacuum pump to evacuate the SF6 electrical equipment (or steel cylinder) and the connecting pipelines, and then directly use the pressure difference or the suction performance of the compressor to create a certain pressure difference to charge the SF6 in the storage container into the SF6 electrical equipment until the required working pressure is reached. When filling the cylinder is required, the characteristics of the R22 refrigerant are used to directly fill the liquefied SF6 into the steel cylinder.

[0008] At present, all electrical equipment with voltage levels of 35kV and above in all substations in operation use SF6 circuit breakers to interrupt current. At the same time, due to limited space, open equipment is gradually replaced by fully enclosed combination electrical appliances. The commissioning of a large number of SF6 electrical equipment has led to new problems. With the increase in operating years and aging of equipment, SF6 gas leaks and needs to be frequently replenished.

[0009] In addition, with the increasing number of domestic and foreign manufacturers of SF6 electrical equipment, there are more and more equipment of different models and specifications. However, due to the lack of unified standards for the gas supply interface of electrical equipment, each manufacturer implements its own standards, resulting in a large number of gas charging joints and pipeline models. At the same time, there is no unified interface specification and connection method for external equipment such as SF6 gas detection instruments, vacuum devices, SF6 recovery devices, etc., which are generated for the installation, testing, and maintenance of SF6 electrical equipment, resulting in a variety of supporting pipelines and joints in a mess.

[0010] Therefore, in the face of the problem of diversified joints, it is often necessary to add adapters to connect the pipeline with the gas joint. For the connection method of adding adapters, since there is no installation position for the adapters on the gas joint, the gas joint needs to be processed again, and then the adapters are connected to the gas joint, and the other end of the adapters is connected to the SF6 vacuum filling equipment. This setting not only increases the manual operation process and the burden on the operators, but also leads to an increase in the process and production costs. Not only that, but also due to the different specifications of the joints, the accessories are incomplete, which brings difficulties to the inspection and maintenance work.

[0011] CN117053092B discloses an SF6 vacuuming and charging device, which extracts SF6 waste gas from electrical components through the vacuuming and charging device. After the vacuuming is completed, SF6 is filled to ensure the stable operation of the electrical components. When the device extracts SF6 waste gas from different electrical components, different joints need to be replaced, which increases the process of replacing joints and the workload.

[0012] The document with application number CN202322889167.5 discloses a fast charging and ventilation integrated device, which belongs to the field of insulating gas charging and ventilation technology. The device includes a mobile box, a bottom plate is provided in the mobile box, a main pipeline is provided on the bottom plate, and a number of branch pipes are connected to the main pipeline, two of which are connected to a dual vortex-driven fast inflation valve, and the remaining branch pipes are connected to a self-sealing joint, and the branch pipes are respectively connected to a 10mm-sized pipe and a 5mm-sized pipe through the self-sealing joint, and a valve is also provided on the branch pipe, and a pressure gauge is also provided on the main pipeline, and the pressure gauge is arranged on the surface of the mobile box. The device can simultaneously meet the simultaneous recovery, vacuumization or inflation of two sulfur hexafluoride devices, without multiple disassembly and assembly of the joint, short time consumption and high efficiency. The device is connected to different SF6 electrical equipment by setting a branch pipe and a self-sealing joint, and adding a new adapter joint. This method leads to increased costs, increased installation processes, and increased workload. Summary of the invention

[0013] In view of this, the present invention aims to propose an SF6 vacuuming and charging device and a method of using the same, so as to realize the rapid combination of charging connectors of different equipment, improve work efficiency and reduce the burden on operators.

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

[0015] An SF6 vacuuming and charging device comprises a frame, a vacuum pump for vacuuming arranged on the frame, a gas cylinder for charging, and a pipeline assembly connected with the vacuum pump and the gas cylinder pipeline;

[0016] The pipeline assembly is connected to a plurality of pipeline joints through an air pipe, and the pipeline joints include an electrical joint connected to the SF6 electrical equipment and a plug-in joint connected to the air pipe, and the electrical joints and the plug-in joints are arranged in a one-to-one correspondence;

[0017] The plurality of plug connectors are pivotally connected to the frame, and the frame is also provided with a drilling mechanism for drilling holes in the plug connectors, wherein the drilling mechanism includes a tapping portion that moves along the arrangement direction of the plurality of plug connectors;

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

[0019] Further, the frame is pivotally connected with a pivot shaft, and a first driving part for driving the pivot shaft to rotate;

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

[0021] A limited space for clamping the plug connector is formed between the movable plate and the fixed plate, and the movable plate is driven to approach or move away from the fixed plate so that the plug connector is in a clamped state or a relaxed state.

[0022] Furthermore, a second driving part is connected to one side of the horizontal plate, a connecting rod is connected to a power output end of the second driving part, and the connecting rod is connected to a plurality of 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 toward the long grooves. The second driving part drives the movable plate to slide along the length direction of the horizontal plate to expand or shrink the limited space.

[0024] Furthermore, the drilling mechanism further comprises an auxiliary bracket connected to the frame, and a linear module arranged on the auxiliary bracket; the tapping part is connected to the movable end of the linear module;

[0025] The tapping part includes a third driving part, a drill clamp arranged on the third driving part, and a drill bit connected to the drill clamp. The third driving part rotates to drive the drill clamp to drive the drill bit to rotate and drill the plug joint.

[0026] Further, the driving mechanism is arranged in one-to-one correspondence with the plug connector, and the driving mechanism includes a fourth driving part, a screw sleeve connected to the power output end of the fourth driving part, the screw sleeve has an inner hole, the inner hole of the screw sleeve is provided with a rotating sleeve for transmission connection, and the rotating sleeve and the screw sleeve are both provided with matching spiral grooves, and a steel ball is provided in the spiral groove;

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

[0028] Furthermore, the frame is provided with a plurality of installation plates arranged at intervals, and the installation plates are used to fix a plurality of the electrical connectors;

[0029] A pressing plate for fastening the electrical connector is provided on each of the mounting plates.

[0030] Furthermore, the pipeline assembly includes a plurality of branch roads, and a first stop valve disposed on the branch roads;

[0031] The gas outlet of the gas cylinder is communicated with the pipeline assembly through an air charging pipeline, and a second stop valve is provided on the air charging pipeline.

[0032] Furthermore, the air pipe is connected to a vacuum gauge and a third stop valve.

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

[0034] The SF6 vacuuming and inflating device of the present invention provides a plurality of pipe joints and a tapping part for drilling the plug-in joint, and performs tapping on the plug-in joints corresponding to different electrical joints so that the plug-in joints can be relatively connected with different electrical joints, thereby avoiding the connection method of adding connectors in the prior art, reducing the manual assembly process, reducing the labor intensity, improving work efficiency, and saving costs due to the reduction of connectors. In addition, a driving mechanism is provided to automatically connect the plug-in joint with the electrical joint, and then the electrical joint connected to the SF6 vacuuming and inflating device is connected to the SF6 electrical equipment, thereby increasing the connection efficiency and convenience between the SF6 vacuuming and inflating device and the SF6 electrical equipment.

[0035] In addition, by rotating the first driving part 90°, the plug connector fixed on the horizontal plate can be driven to rotate 90°, which is convenient for drilling internal thread holes at the connection position between the plug connector and the electrical connector to adapt to the thread specifications of different electrical connectors and avoid adding adapters. The movable plate and the fixed plate, as well as the first driving part, are also provided to facilitate the fixing and loosening of the plug connector. The structure is simple to set and easy to implement and install. The second driving part is provided to drive the connecting rod to slide in the length direction of the horizontal plate, so as to facilitate the tightening or loosening of the plug connector.

[0036] In addition, the driving mechanism and the plug-in connector are arranged in a one-to-one correspondence. The fourth driving part drives the screw sleeve to move in the direction close to the electrical connector, and 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 part continues to push the rotating sleeve to rotate relative to the screw sleeve and displace axially at the same time. The rotating sleeve drives the plug-in connector to rotate and is screwed and fixed with the electrical connector, so that the plug-in connector and the electrical connector are automatically connected, reducing the labor intensity of the staff and improving the installation efficiency.

[0037] The pressing plate of the present invention is fixedly connected with the mounting plate by bolts, and a mounting hole adapted to the corresponding electrical connector is formed on the mounting plate. When the electrical connector is set in the mounting hole, the electrical connector is fixed by the pressing plate. The opening and closing of the vacuum pipeline can be controlled by the first stop valve, and the opening and closing of the inflation pipeline can be controlled by the second stop valve. By controlling the third stop valve, the opening and closing of the air pipe can be controlled, and the pipeline between the SF6 electrical equipment and the SF6 vacuum inflation device can be opened and closed, which is convenient for detection or maintenance.

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

[0039] Wherein, the vacuuming step comprises:

[0040] Step 1: The first driving unit drives the plug connector to a drilling state, drills the plug connector through the drilling mechanism, and then drives the plug connector to a mounting state, and drives the plug connector to be screwed and fixed with the electrical connector through the driving mechanism;

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

[0042] Before vacuuming, check whether the oil level of the vacuum pump is at the center of the oil mark. If there is no oil, add the required oil first. Plug in the power supply. The power supply used by this equipment is 380V three-phase 50Hz. After power on, observe whether the green light of the power indicator is on. If it is not on, it means the phase sequence is incorrect. Turn the phase sequence adjustment switch to the "1" or "2" position. The green light of the power indicator is on, indicating that the phase sequence is correct. Then start the vacuum pump to see whether the direction of the vacuum pump is consistent with the direction indicated by the vacuum pump, and confirm 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 is achieved;

[0045] Step 5: After reaching the required final vacuum degree, the equipment enters automatic state.

[0046] Furthermore, the inflation step includes:

[0047] Step 1: After ensuring that the SF6 vacuum filling device is connected to vacuum, close the vacuum pump pipeline;

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

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

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

[0051] The SF6 vacuuming and charging device of the present invention performs tapping on the plug-in joint by means of a tapping portion, and connects and fixes the plug-in joint with the electrical joint by means of a driving mechanism, and then fixes the connected pipe joint on the SF6 electrical equipment, and connects the SF6 vacuuming and charging device and the SF6 electrical equipment together by means of an air pipe to perform vacuuming and charging operations. This method can save the manual operation procedures in the prior art when assembling the pipeline, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0053] Figure 1 A schematic diagram of the three-dimensional structure of the SF6 vacuuming and charging device according to an embodiment of the present invention from a first viewing angle;

[0054] Figure 2 A schematic diagram of the three-dimensional structure of the SF6 vacuuming and charging device according to an embodiment of the present invention from a second viewing angle;

[0055] Figure 3 It is a left side schematic diagram of the SF6 vacuuming and charging device according to an embodiment of the present invention;

[0056] Figure 4 A schematic top view of the SF6 vacuum filling device according to an embodiment of the present invention;

[0057] Figure 5 It is a schematic diagram of the three-dimensional structure of the SF6 vacuuming and charging device according to an embodiment of the present invention, excluding the electrical connector from a first viewing angle;

[0058] Figure 6 It is a schematic diagram of the three-dimensional structure of the SF6 vacuuming and charging device according to an embodiment of the present invention, excluding the electrical connector from a second viewing angle;

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

[0060] Figure 8 This is a simplified diagram of the working principle of vacuuming and charging of the SF6 vacuuming and charging device described in an embodiment of the present invention.

[0061] Description of reference numerals:

[0062] 1. Frame; 2. Vacuum pump; 3. Gas cylinder; 4. Pipeline assembly; 5. Electrical connector; 6. Plug connector; 7. Drilling mechanism; 8. Tapping unit; 9. Driving mechanism; 10. Pivot shaft; 11. First driving unit; 12. Horizontal plate; 13. Fixed plate; 14. Movable plate; 15. Second driving unit; 16. Connecting rod; 17. Mounting plate; 18. Press plate; 19. First stop valve;

[0063] 401, branch road;

[0064] 701, auxiliary bracket; 702, linear module;

[0065] 801, third driving unit; 802, drill clamp; 803, drill bit;

[0066] 901, fourth driving part; 902, screw sleeve; 903, rotating sleeve; 904, spiral groove; 905, steel ball. DETAILED DESCRIPTION

[0067] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0068] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0069] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

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

[0071] This embodiment relates to an SF6 vacuuming and inflating device, which includes a frame, a vacuum pump for vacuuming arranged on the frame, a gas cylinder for inflating, and a pipeline assembly connected to the vacuum pump and the gas cylinder pipeline. The pipeline assembly is connected to a plurality of pipeline joints through an air pipe, and the pipeline joints include an electrical joint connected to the SF6 electrical equipment and a plug-in joint connected to the air pipe, and the electrical joint and the plug-in joint are arranged in a one-to-one correspondence.

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

[0073] The SF6 vacuuming and inflating device of this embodiment is provided with a plurality of pipe joints and a tapping part for drilling the plug-in joint, and the plug-in joints corresponding to different electrical joints are tapped so that the plug-in joints are relatively connected with different electrical joints, thereby avoiding the connection method of adding connectors in the prior art, reducing the manual assembly process, reducing the labor intensity, improving work efficiency, and saving costs due to the reduction of connectors. In addition, a driving mechanism is provided to automatically connect the plug-in joint with the electrical joint, and then the electrical joint connected with the SF6 vacuuming and inflating device is connected to the SF6 electrical equipment, thereby increasing the connection efficiency and convenience between the SF6 vacuuming and inflating device and the SF6 electrical equipment.

[0074] Based on the above overall introduction, an exemplary structure of the SF6 vacuum filling device of this embodiment is as follows: Figures 1 to 4 As shown, the frame of this embodiment is a frame welded by rectangular steel pipes. Among them, the vacuum pump and the gas cylinder are arranged on the frame. The outlet end of the vacuum pump is connected to an air outlet pipe, and the air outlet pipe is connected to the air inlet of the pipeline assembly. The pipeline assembly in this embodiment includes a main pipeline and six branch pipelines connected to the main pipeline, and the ends of the branch pipelines are connected to the plug-in connectors through air pipes.

[0075] As a preferred implementation mode, Figures 1 to 6 As shown, the frame is pivotally connected with a pivot shaft and a first driving part for driving the pivot shaft to rotate. A horizontal plate is connected above the pivot shaft, and the horizontal plate is provided with a plurality of fixed plates extending vertically upward and a plurality of movable plates slidably connected to the horizontal plate, and the fixed plates and the movable plates are arranged one by one. A limited space for clamping the plug connector is enclosed between the movable plate and the fixed plate, and the movable plate is driven to approach or move away from the fixed plate so that the plug connector is in a clamped state or a relaxed state.

[0076] like Figures 5 and 6As shown, the first driving part adopts a driving motor, which is fixedly connected to the side of the frame, and the power output shaft of the driving motor is key-connected to the pivot shaft. The first driving part rotates 90°, which can drive the plug connector fixed on the horizontal plate to rotate 90°, so as to facilitate drilling the internal threaded hole at the connection position between the plug connector and the electrical connector to adapt to the thread specifications of different electrical connectors and avoid adding adapters.

[0077] In addition, by providing a movable plate, a fixed plate, and a first driving part, it is convenient to fix and loosen the plug connector. The structure is simple to set and easy to implement and install.

[0078] Furthermore, if Figures 5 and 6 As shown, a second driving unit is connected to one side of the horizontal plate, a connecting rod is connected to the power output end of the second driving unit, and the connecting rod is connected to a plurality of movable plates. The horizontal plate is provided with a plurality of long grooves arranged along its own length direction, and the movable plate is provided with a protrusion protruding toward the long groove. The second driving unit drives the movable plate to slide along the length direction of the horizontal plate to expand or reduce the limited space.

[0079] like Figure 5 As shown, the second driving part of this embodiment adopts a telescopic cylinder, the fixed plate is a rectangular plate structure, connected to the horizontal plate by bolts, the movable plate has the same appearance as the fixed plate, the number of fixed plates and movable plates corresponds to the number of plug-in connectors, and the limited space between the fixed plate and the movable plate corresponds to the outlet of the branch pipeline. The protrusion in this embodiment is a rectangular structure, formed under the movable plate, and the long groove (not shown in the figure) is set corresponding to the protrusion. By setting the second driving part, the connecting rod is driven to slide in the direction of the length of the horizontal plate, so as to tighten or loosen the plug-in connector.

[0080] As a specific implementation method, Figures 1 to 6 As shown, the drilling mechanism also includes an auxiliary bracket connected to the frame, and a linear module arranged on the auxiliary bracket; the tapping part is connected to the movable end of the linear module. The tapping part includes a third driving part, a drill clamp arranged on the third driving part, and a drill bit connected to the drill clamp, and the third driving part rotates to drive the drill clamp to drive the drill bit to rotate to drill the plug-in joint.

[0081] As Figures 1 to 6 As shown, the third drive unit uses a rotary motor. Since the electrical connector specifications corresponding to SF6 electrical equipment are mostly the 6 types shown in the figure, electrical connectors with the same thread specifications are placed in adjacent positions to facilitate tapping by the drilling mechanism. When different specifications of thread processing are required, the drill bit can be manually replaced. Alternatively, multiple active ends are set on the linear module, and different tapping parts are set on different active ends to achieve full automatic operation.

[0082] Preferably, if Figures 1 to 7As shown, the driving mechanism and the plug connector are arranged one by one, the driving mechanism includes a fourth driving part, a screw sleeve connected to the power output end of the fourth driving part, the screw sleeve has an inner hole, the inner hole of the screw sleeve is provided with a rotating sleeve for transmission connection, the rotating sleeve and the screw sleeve are both provided with matching spiral grooves, and steel balls are arranged in the spiral grooves. The inner diameter of the rotating sleeve is matched with the outer diameter of one end of the plug connector.

[0083] The fourth driving part adopts a telescopic cylinder, and the driving mechanism is arranged in a one-to-one correspondence with the plug-in connector. The fourth driving part drives the screw sleeve to move in the direction close to the electrical connector, and 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 part continues to push the rotating sleeve to rotate relative to the screw sleeve and displace axially at the same time. The rotating sleeve drives the plug-in connector to rotate and is screwed and fixed with the electrical connector, so that the plug-in connector and the electrical connector are automatically connected, reducing the labor intensity of the staff and improving the installation efficiency.

[0084] In addition, if Figures 5 and 6 As shown, a plurality of spaced mounting plates are provided on the frame, and the mounting plates are used to fix a plurality of electrical connectors. Each mounting plate is provided with a pressing plate for fastening the electrical connector. The pressing plate of this embodiment is fixedly connected with the mounting plate by bolts, and mounting holes adapted to the corresponding electrical connectors are formed on the mounting plate. When the electrical connector is set in the mounting hole, the electrical connector is fixed by the pressing plate.

[0085] Preferably, if Figures 1 to 4 As shown, the pipeline assembly includes a plurality of branch roads and a first stop valve disposed on the branch roads. The gas outlet of the gas cylinder is connected to the pipeline assembly through the inflation pipeline, and a second stop valve is disposed on the inflation pipeline. The first stop valve can control the opening and closing of the vacuum pipeline, and the second stop valve can control the opening and closing of the inflation pipeline.

[0086] In addition, a vacuum gauge and a third stop valve are connected to the gas pipe. By controlling the third stop valve, the opening and closing of the gas pipe can be controlled, and the pipeline between the SF6 electrical equipment and the SF6 vacuum filling device can be opened and closed, which is convenient for detection or maintenance.

[0087] It is necessary to point out that if Figures 1 to 7 As shown, the electrical connector 5 mainly includes SF6 charging connector, SF6 adapter, SF6 transition adapter and other types. These connectors are specially used for charging, sampling, recovery, vacuuming and other operations of SF6 electrical equipment to meet the needs of imported and domestic electrical equipment of different voltage levels. They can be applied to various SF6 electrical equipment vacuuming, SF6 recovery and charging connectors, and are suitable for various specifications of imported and domestic SF6 switches, GIS, and SF6 density relay on-site calibration. In addition, these connectors are also suitable for various imported and domestic micro-water test transition connectors to ensure the test accuracy and service life of the equipment.

[0088] SF6 gas filling connector: mainly used as auxiliary accessories for filling, sampling, recycling and vacuuming of SF6 electrical equipment, which can meet the needs of imported and domestic electrical equipment of different voltage levels. The material can be copper or stainless steel, which is suitable for SF6 electrical equipment of various manufacturers.

[0089] SF6 adapter and SF6 transition adapter: suitable for the installation and transfer of various SF6 circuit breakers, simple and convenient operation, suitable for various specifications of imported and domestic SF6 switches, GIS adapters. These connectors can filter out 5 micron granular impurities, purify the gas source, and ensure the test accuracy and service life of the equipment.

[0090] The application of the above connectors not only improves the working efficiency of SF6 electrical equipment, but also ensures the safe operation of the equipment. The products provided by the supplier include but are not limited to copper and aluminum GIS adapters, filter conversion devices, etc., to meet the needs of different users. In addition, these connectors can also be customized as non-standard accessories according to user requirements, further meeting the diverse needs of the market.

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

[0092] The compressor and vacuum pump in the SF6 vacuum charging device play a vital role in power equipment and refrigeration systems. In terms of power equipment, the device can extract the high-pressure SF6 gas through a vacuum pump, and then re-enter the gas into the equipment through a circulation pump for circulation and purification, so that it can meet the purity requirements of high-voltage power equipment. In addition, the device also has equipment such as dryers and filters, which can effectively remove moisture and impurities in SF6, thereby improving the purity and quality of SF6 gas. Finally, the device also has a charging function, which can re-inject the purified SF6 gas into high-voltage power equipment to ensure the stable operation and safety of the power system.

[0093] In terms of refrigeration systems, the functions of SF6 gas vacuum filling devices include removing non-condensable gases and moisture in the system. The presence of non-condensable gases will increase the system condensation pressure and exhaust temperature, affecting the refrigeration effect; and moisture is the main problem in refrigeration systems, which will cause the lubricating oil to react with moisture to generate acid, corrode the system, and cause "copper plating" phenomenon, damaging the compressor. Therefore, the vacuum filling device can further check the air tightness of the system by using a vacuum pump system to perform vacuum operation, and remove air, moisture and other non-condensable gases in the system, preparing for the system to be filled with refrigeration SF6 gas.

[0094] The compressor of the SF6 vacuuming and charging device of this embodiment is mainly used for recovering, charging, discharging, purifying, vacuuming and storing SF6 gas.

[0095] The compressor of the SF6 vacuum filling device plays a key role in the operation. Its specific functions are as follows:

[0096] Recovery function: Utilize the suction and compressibility of the compressor to suck SF6 gas at a certain pressure in SF6 electrical equipment into the compressor and compress it to a higher pressure for liquefaction and storage.

[0097] Charging and discharging function: First, use the vacuum pump of the device to evacuate the SF6 electrical equipment (or cylinder) and the connecting pipelines, and then directly use the pressure difference or use the suction capacity of the compressor to create a certain pressure difference to charge the SF6 in the storage container of the device into the SF6 electrical equipment until the required working pressure is reached.

[0098] Purification function: During the recovery and charging and discharging process, the system is equipped with an oil separator and a dry filter to effectively remove the oil and moisture in the SF6 gas. The filter is equipped with a heating regeneration device, which can be heated and regenerated under vacuum, so that the molecular sieve can be used repeatedly to ensure 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 appliances to ensure the airtightness and purity of the system.

[0100] Storage function: Through the compression action of the compressor, the recovered SF6 gas is compressed and stored in the storage container of the device for subsequent use or refilling into electrical equipment.

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

[0102] The SF6 vacuuming and charging device described in this embodiment is provided with a plurality of pipe joints and a tapping portion for drilling plug-in joints, and the plug-in joints of different electrical joints are tapped to make the plug-in joints relatively connected to the different electrical joints. A driving mechanism is also provided to automatically connect the plug-in joints to the electrical joints, thereby avoiding the connection method of adding connecting parts in the prior art, reducing the manual assembly process, improving work efficiency, saving costs, and increasing the connection efficiency and convenience between the SF6 vacuuming and charging device and SF6 electrical equipment.

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

[0104] The vacuuming step includes:

[0105] The first step: driving the plug connector to a drilling state, drilling the plug connector by a drilling mechanism, and then driving the plug connector to an installation state, driving the plug connector to be screwed and fixed with the electrical connector by a driving mechanism;

[0106] Step 2: Connect the pipeline assembly to the assembled pipeline joint through the air pipe, that is, connect the SF6 vacuum filling device and the SF6 electrical equipment together, and close the filling pipeline through the second stop valve;

[0107] Before vacuuming, check whether the oil level of the vacuum pump is at the center of the oil mark. If there is no oil, add the required oil first. Plug in the power supply. The power supply used by this equipment is 380V three-phase 50Hz. After power on, observe whether the green light of the power indicator is on. If it is not on, it means the phase sequence is incorrect. Turn the phase sequence adjustment switch to the "1" or "2" position. The green light of the power indicator is on, indicating that the phase sequence is correct. Then start the vacuum pump to see whether the direction of the vacuum pump is consistent with the direction indicated by the vacuum pump, and confirm again;

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

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

[0110] During the operation of the vacuum pump, the exhaust valve is responsible for discharging or regulating the pressure inside the system. When the pressure inside the system gradually decreases and forms a vacuum state, if the pressure in the system cannot be effectively discharged, it may have a negative impact on the performance of the pump and even damage the internal structure of the pump. The function of the exhaust valve is to automatically open the valve when the pressure reaches a certain value to discharge excess gas to avoid damage to the pump due to excessive pressure. In addition, the exhaust valve can also adjust the pressure. By adjusting the opening of the valve, the exhaust volume and exhaust speed of the system can be controlled, which in turn affects the working efficiency of the pump and the pressure state of the system. This adjustment function can not only improve the working efficiency of the pump, but also flexibly adjust the system pressure according to actual work needs to meet different work requirements.

[0111] Start the vacuum pump to evacuate the air. It is difficult to evacuate all the air in the system. In order to achieve a certain vacuum degree, the vacuuming should be carried out several times with an interval of about 10 minutes to balance the pressure in the system.

[0112] The main function of the vacuum pump's exhaust valve is to regulate the pressure inside the system to ensure 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 achieved;

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

[0115] After vacuuming, the system should be kept for 24 hours, and the pressure rise in the system should not exceed 666.61Pa. If the pressure rises quickly, the cause should be found out and eliminated in time;

[0116] Step 5: After reaching the required final vacuum degree, the equipment enters the automatic state. In this embodiment, it is set to enter the timing state when it is lower than 30Pa. It stops when the timing ends and automatically starts when it rises back to 200Pa.

[0117] This process involves standard operations of evacuating the air chamber and checking its sealing performance. When there is no clear manufacturer's regulations, the usual practice is to evacuate the air chamber to below 133Pa and continue evacuating for 30 minutes. Then, stop evacuating and wait for 30 minutes, and record the vacuum degree (A) at this time. After that, wait for another 5 hours and read the vacuum degree again as (B). If the difference between (B) and (A) is less than 133Pa, the air chamber is considered to be sealed. This process ensures that the air chamber maintains a stable low vacuum state for a long time, thereby verifying whether its sealing performance meets the standards.

[0118] Table 1 shows the test values ​​of vacuum time and vacuum volume

[0119]

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

[0121] When vacuuming, please note:

[0122] First, before turning on the vacuum pump to evacuate, decide whether to connect the pipeline to discharge to the outside according to the needs;

[0123] Secondly, before starting the vacuum pump to evacuate the device or system, it is necessary to ensure that the pressure of the device or system being evacuated is zero gauge pressure or below;

[0124] The SF6 compressor cannot be started while the vacuum is maintained.

[0125] The inflation steps include:

[0126] Step 1: After ensuring that the SF6 vacuum pumping and filling device is connected to vacuum, close the vacuum pump 2 pipeline;

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

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

[0129] Check the SF6 gas temperature and pressure curve to find the pressure value corresponding to the current temperature;

[0130] Step 3: Open the gas cylinder 3, adjust the pressure of the gas charging pipeline through the pressure reducing valve, connect the gas charging pipeline, and refill the gas;

[0131] Connect the pressure reducing valve on the inflation pipeline, and slowly open the pressure reducing valve to inflate the circuit breaker, taking care to avoid excessive gas pressure;

[0132] When the gas in the circuit breaker is filled to the rated pressure, close the pressure reducing valve, remove the gas charging pipe, and tighten the interface;

[0133] Inflation should be done slowly to avoid sudden temperature drops in the inflation pipeline, joints and inflation devices, frost on the surface and hardening of the rubber tube;

[0134] Step 4: When the required inflation pressure is reached, the gas cylinder 3 is closed again through the second stop valve, and all inflation pipelines are closed to complete the backfilling operation;

[0135] During the inflation process, ensure that the gas replenishment speed is uniform, not too fast or too slow;

[0136] After inflation is complete, excess gas is discharged by using the deflation valve;

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

[0138] Record the temperature, humidity and sulfur hexafluoride pressure values ​​of the day for subsequent observation and comparison.

[0139] The method for using the SF6 vacuuming and inflating device of this embodiment is to tap the plug-in connector 6 through the tapping part 8, and connect and fix the plug-in connector 6 with the electrical connector 5 through the driving mechanism, and then fix the connected pipe connector on the SF6 electrical equipment, and connect the SF6 vacuuming and inflating device and the SF6 electrical equipment together through the air pipe to perform vacuuming and inflating operations. This method can save the manual operation process when assembling the pipeline 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A SF6 vacuum filling device, characterized in that: The invention comprises a frame (1), a vacuum pump (2) for vacuuming arranged on the frame (1), a gas cylinder (3) for inflating, and a pipeline assembly (4) connected to the vacuum pump (2) and the gas cylinder (3) through pipelines; the pipeline assembly (4) is connected to a plurality of pipeline joints through an air pipe, the pipeline joints include an electrical joint (5) connected to SF6 electrical equipment, and a plug joint (6) connected to the air pipe, the electrical joint (5) and the plug joint (6) are arranged in a one-to-one correspondence; a plurality of the plug joints (6) are pivotally connected to each other. The frame (1) is also provided with a drilling mechanism (7) for drilling holes in the plug-in connector (6), the drilling mechanism (7) comprising a tapping portion (8) that moves along the arrangement direction of the plurality of plug-in connectors (6); the plug-in connector (6) is driven to rotate 90° to be in a drilling state and an installation state respectively, and the frame (1) is also provided with a driving mechanism (9) for driving the plug-in connector (6) to rotate in the installation state, the driving mechanism (9) driving the plug-in connector (6) to be screwed onto the electrical connector (5).

2. The SF6 vacuum filling device according to claim 1, characterized in that: The frame (1) is pivotally connected to 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), and the horizontal plate (12) is provided with a plurality of fixed plates (13) extending vertically upward, and a plurality of movable plates (14) slidably connected to the horizontal plate (12), and the fixed plates (13) and the movable plates (14) are arranged in a one-to-one correspondence; A limited space for clamping the plug connector (6) is enclosed between the movable plate (14) and the fixed plate (13), and the movable plate (14) is driven to approach or move away from the fixed plate (13) so that the plug connector (6) is in a clamped state or a relaxed state.

3. The SF6 vacuum filling device according to claim 2 is characterized in that: A second driving part (15) is connected to one side of the horizontal plate (12); a power output end of the second driving part (15) is connected to a connecting rod (16); and the connecting rod (16) is connected to a plurality of movable plates (14); The horizontal plate (12) is provided with a plurality of long grooves arranged along its own length direction, and the movable plate (14) is provided with protrusions protruding toward the long grooves. The second driving part (15) drives the movable plate (14) to slide along the length direction of the horizontal plate (12) to expand or shrink the limited space.

4. The SF6 vacuum filling device according to claim 3 is characterized in that: The drilling mechanism (7) further comprises an auxiliary bracket (701) connected to the frame (1), and a linear module (702) arranged on the auxiliary bracket (701); 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 clamp (802) arranged on the third driving part (801), and a drill bit (803) connected to the drill clamp (802); the third driving part (801) rotates to drive the drill clamp (802) to drive the drill bit (803) to rotate and drill the plug connector (6).

5. The SF6 vacuum filling device according to claim 4 is characterized in that: The driving mechanism (9) is arranged in a one-to-one correspondence with the plug connector (6), and the driving mechanism (9) comprises a fourth driving part (901), a screw sleeve (902) connected to the power output end of the fourth driving part (901), the screw sleeve (902) having an inner hole, the inner hole of the screw sleeve (902) is provided with a rotating sleeve (903) for transmission connection, the rotating sleeve (903) and the screw sleeve (902) are both provided with matching spiral grooves (904), and a steel ball (905) is provided in the spiral groove (904); The inner diameter of the rotating sleeve (903) is matched with the outer diameter of one end of the plug connector (6).

6. The SF6 vacuum filling device according to claim 5, characterized in that: The frame (1) is provided with a plurality of installation plates (17) arranged at intervals, and the installation plates (17) are used to fix a plurality of the electrical connectors (5); Each of the mounting plates (17) is provided with a pressing plate (18) for fastening the electrical connector (5).

7. The SF6 vacuum filling device according to claim 1, characterized in that: The pipeline assembly (4) comprises a plurality of branch roads (401) and a first stop valve (19) arranged on the branch roads (401); The gas outlet of the gas cylinder (3) is connected to the pipeline assembly (4) via a gas charging pipeline, and a second stop valve is provided on the gas charging pipeline.

8. The SF6 vacuum filling device according to claim 1, characterized in that: The air pipe is connected with a vacuum gauge and a third stop valve.

9. A method for using a SF6 vacuum filling device, characterized in that: The SF6 vacuuming and gas filling device according to any one of claims 2 to 8 comprises a vacuuming step and a gas filling step: Wherein, the vacuuming step comprises: Step 1: The first driving unit (11) drives the plug connector (6) to a drilling state, drills the plug connector (6) through the drilling mechanism (7), and then drives the plug connector (6) to a mounting state, and drives the plug connector (6) to be screwed and fixed to the electrical connector (5) through the driving mechanism (9); Step 2: Connect the pipeline assembly (4) to the assembled pipeline joint through the air pipe, that is, connect the SF6 vacuum filling device and the SF6 electrical equipment together, and close the filling pipeline; Before vacuuming, first check whether the oil level of the vacuum pump is at the center of the oil mark. If there is no oil, add the required oil first. Plug in the power supply. The power supply used by the equipment is 380V three-phase 50Hz. After power on, observe whether the green light of the power indicator is on. If it is not on, it means the phase sequence is incorrect. Turn the phase sequence adjustment switch to the "1" or "2" position. The green light of the power indicator is on, indicating that the phase sequence is correct. Then start the vacuum pump to see whether the direction of the vacuum pump is consistent with the direction indicated by the vacuum pump, and confirm again; Step 3: Press the green vacuum button on the control panel to start the vacuum function; Step 4: Evacuate the SF6 electrical equipment until a stable vacuum is achieved; Step 5: After reaching the required final vacuum degree, the equipment enters automatic state.

10. The method for using the SF6 vacuum filling device according to claim 9, characterized in that: The inflation step comprises: Step 1: After ensuring that the SF6 vacuum filling device is connected to vacuum, close the vacuum pump (2) pipeline; Step 2: Connect the gas cylinder (3) to the pipeline assembly (4); Step 3: Open the gas cylinder (3), adjust the pipeline pressure, connect the gas charging pipeline, and refill the gas; Step 4: When the required inflation pressure is reached, close the gas cylinder (3) again, close all inflation pipelines, and complete the backfilling operation.

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