Sulfur hexafluoride and nitrogen mixed inflating device

Abstract

The utility model provides a sulfur hexafluoride nitrogen mixing and inflating device which comprises a gas mixing assembly, the gas mixing assembly is connected with a vacuumizing assembly used for vacuumizing equipment, the gas mixing assembly comprises a gas mixing tank used for mixing gas, the upper end of the gas mixing tank is connected with the tail end of a second gas mixing pipe set in a sealed mode, and the tail end of the second gas mixing pipe set is connected with the vacuumizing assembly. One end of the gas mixing tank is in sealed connection with the tail end of the gas mixing pipe group I, and a product pipe group for discharging finished products is fixed at the upper end of the right side of the gas mixing tank. The SF6 gas and nitrogen gas mixing device can meet different field operation requirements, provides a highly customized solution for a user, supports intelligent mixing and proportioning of two gases, integrates multifunctional processing modules such as vacuumizing, mixing and filling, gas supply calculation and the like, and can accurately control the inlet amount of SF6 gas and nitrogen gas by arranging a flow meter II and a flow meter I.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas mixing equipment, and specifically relates to a sulfur hexafluoride nitrogen gas mixing and charging device. Background Technology

[0002] In power systems, SF6 gas is a typical potent greenhouse gas, with a greenhouse effect 23,900 times that of an equivalent amount of CO2, posing a significant environmental impact. Furthermore, SF6 decomposes under electric arc conditions, producing highly reactive and harmful substances. When coexisting with moisture and oxygen, it reacts with electrode materials and moisture to form complex compounds. This not only accelerates the aging of organic insulation materials and metal corrosion within the equipment, leading to decreased insulation performance, but also poses a potential threat to operator safety. Existing equipment often employs an integrated design, with the gas mixing module, purification module, and inflation control unit rigidly connected, resulting in bulky equipment that cannot be quickly disassembled and reassembled according to site conditions (such as confined substations or mobile maintenance vehicles). For example, in remote areas, the entire system must be carried when replenishing gas, leading to low operational efficiency. Therefore, we aim to design a novel hybrid inflation device to address this problem. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a sulfur hexafluoride and nitrogen gas mixing and charging device to solve the problems mentioned in the background technology.

[0004] This utility model is achieved through the following technical solution: a sulfur hexafluoride nitrogen gas mixing and charging device, comprising: a gas mixing assembly, the gas mixing assembly being connected to a vacuuming assembly for evacuating the equipment, the gas mixing assembly including a gas mixing tank for gas mixing, the upper end of the gas mixing tank being sealed to two ends of a gas mixing pipe assembly, the end of the gas mixing tank being sealed to one end of the gas mixing pipe assembly, a product pipe assembly for finished product discharge being fixed to the upper right side of the gas mixing tank, and an exhaust pipe assembly for venting being fixed to the lower right side of the gas mixing tank;

[0005] The vacuum assembly includes a vacuum pump for vacuuming. The inlet of the vacuum pump is sealed to the end of the vacuum tube assembly. The starting section of the vacuum tube assembly is sealed to the right side of the product tube assembly. In actual use, the equipment also includes a gas replenishment calculation and processing module. The gas replenishment calculation and processing module performs subsequent gas replenishment operations through detection and calculation, in conjunction with the intelligent control system. The entire equipment uses a fully automatic PLC touch screen for unified safety control and real-time monitoring (the gas replenishment calculation and processing module and the intelligent control system are built into the fully automatic PLC touch screen), realizing unmanned management and fully intelligent one-button operation. The various functional components of the equipment are assembled and installed in a mobile trolley. Valves one to eight have two states: green light and red light, corresponding to the open and closed states of the valves, respectively. The vacuum pump, evaporator one, evaporator two, and compressor have two states: green light and red light, corresponding to the open and closed states, respectively. Flowmeter one and flowmeter two have two states: green light and red light, corresponding to the open and closed states, respectively. Pressure and temperature information are displayed above and below the flowmeters. Pressure sensors one to seven display the pipe pressure of the corresponding pipes.

[0006] In a preferred embodiment, the exhaust pipe assembly is equipped with a vent valve for controlling the switch, and a pressure sensor four is installed on the side of the product pipe assembly near the mixing tank. A compressor and a valve five are installed between the pressure sensor four and the starting end of the vacuum pipe assembly.

[0007] In a preferred embodiment, valve five is located on the right side of the compressor, pressure sensor five is installed on the right side of the product pipe assembly, and a product interface is provided at the right end of the product pipe assembly.

[0008] In a preferred embodiment, a flow meter is installed at one end of the gas mixing pipe assembly near the gas mixing tank. An evaporator, a pressure sensor 7, a valve 4, and a pressure sensor 3 are sequentially installed on the left side of the gas mixing pipe assembly. The pressure sensor 7 is installed on the left side of the evaporator, and the pressure sensor 7 is located to the right of the valve 4. The pressure sensor 3 is located to the left of the valve 4. An SF6 interface is provided at the left end of the gas mixing pipe assembly.

[0009] In a preferred embodiment, a flow meter 2 is installed on the side of the mixing pipe assembly 2 near the upper end of the mixing tank. A branch pipe is installed on the left side of the mixing pipe assembly 2. From right to left, an evaporator 2, a pressure sensor 6, a valve 2, and a pressure sensor 1 are installed on the main pipe of the mixing pipe assembly 2. The pressure sensor 6 is located on the left side of the evaporator 2 and on the right side of the connection between the branch pipe and the main pipe of the mixing pipe assembly 2. A valve 2 is installed on the left side of the pressure sensor 6. The air intake ratio of the flow meter 2 to the flow meter 1 is 7:3. The flow meter 2 and the flow meter 1 can accurately control the intake of SF6 gas and nitrogen gas. The ratio is the N2:SF6 ratio of 7:3.

[0010] In a preferred embodiment, the pressure sensor is located to the left of the valve, and the main pipe of the gas mixing pipe group 2 is provided with an N2 interface 1 at its left end. A valve 3 is installed on the right side of the branch pipe, a pressure sensor 3 is installed on the left side of the branch pipe, and an N2 interface 2 is provided at the left end of the branch pipe. In actual use, the equipment can output a mixed gas concentration that can be arbitrarily set, and can be configured with any two gases of known concentrations, such as SF6 / N2, C4F7N / CO2, C5F10O / CO2, C4F7N / Air, C5F10O / Air, etc.

[0011] In a preferred embodiment, the vacuum assembly further includes a third vacuum tube group and a fourth vacuum tube group. The third vacuum tube group and the fourth vacuum tube group are respectively arranged on the right side of the first vacuum tube group, and the third vacuum tube group is located on the left side of the fourth vacuum tube group.

[0012] The lower end of vacuum tube group three is partially sealed to mixing tube group one between evaporator one and flow meter one via valve six. The lower end of vacuum tube group four is partially sealed to mixing tube group two between evaporator two and flow meter two. In actual use, the final inflation pressure is: during the mixing process, the pressure P5 at the product interface gradually increases. When the pressure P5 reaches the set final inflation pressure, the mixing automatically stops.

[0013] N2 inflation pressure: Before starting the gas mixing, ensure that the N2 interface pressures P1 and P2 are greater than the N2 inflation pressure. If the pressure display is less than the inflation pressure, it means that the gas pressure at the interface is insufficient, and the gas mixing cannot be started at this time.

[0014] SF6 inflation pressure: Before starting the gas mixing, ensure that the SF6 interface pressure P3 is greater than the SF6 inflation pressure. If the pressure display is less than the inflation pressure, it means that the gas pressure at the interface is insufficient, and the gas mixing cannot be started at this time.

[0015] N2 pipeline pressure difference: When the difference between the pipeline pressure P6 of the N2 filling pipeline and the pressure P4 at the outlet of the gas storage tank is less than the set pipeline pressure difference, it indicates that the N2 filling pipeline pressure is too low and the mixing function is terminated.

[0016] SF6 pipeline pressure difference: When the difference between the pipeline pressure P7 of the SF6 filling pipeline and the pressure P4 at the outlet of the gas storage tank is less than the set pipeline pressure difference, it indicates that the SF6 filling pipeline pressure is too low and the mixing function is terminated.

[0017] Opening inflation pressure: When the pressure P4 at the outlet of the gas tank is greater than the opening inflation pressure, the compressor and valve V5 will open automatically. Under the action of the compressor, the mixed gas in the gas tank will be sent out of the product interface.

[0018] Closing the filling pressure: When the pressure P4 at the outlet of the gas tank is less than the closing filling pressure, the compressor and valve V5 will automatically close. After the gas tank is filled with enough gas, they will automatically open and continue to work.

[0019] In a preferred embodiment, a valve is provided on the left side of the first vacuum tube assembly, which is located between the connection between the first and second vacuum tube assemblies and the vacuum pump. A valve is installed on the right side of the second vacuum tube assembly, a vacuum gauge is installed on the left end of the second vacuum tube assembly, and a valve is installed in the middle of the fourth vacuum tube assembly. In actual use, the pipe diameter in the equipment is DN20, and the pipe length is 5 meters or 10 meters, which can be freely combined.

[0020] After adopting the above technical solution, the beneficial effects of this utility model are as follows: 1. By setting up a gas mixing component, the device adopts a modular design, and multiple functional modules can be flexibly combined to meet different on-site operation needs, providing users with highly customized solutions. It supports intelligent mixing and proportioning of two gases, and integrates multi-functional processing modules such as vacuuming, mixing and filling, and gas replenishment calculation. The entire operation process is uniformly controlled and monitored in real time through a fully automatic PLC touch screen, realizing unmanned management and fully intelligent one-button operation, significantly improving work efficiency and safety, while reducing the risks and complexity of manual operation. With its high efficiency, intelligence, and environmental protection features, this device provides reliable technical support for gas management of power equipment. By setting up flow meter two and flow meter one, the amount of SF6 gas and nitrogen entering can be accurately controlled.

[0021] 2. The gas mixing assembly, combined with a vacuum assembly, enables the entire device to automatically pressurize the mixed gas. Through pressure detection and intelligent control, it achieves rapid, accurate, and stable filling of electrical equipment. When the mixed gas concentration inside the electrical equipment deviates from the rated value and adjustment is required, the device automatically calculates the necessary replenishment gas concentration based on the current and target concentrations and pressures within the gas chamber, automatically mixes the gas, and performs the replenishment operation. The device's working pipelines are then vacuumed. The entire device employs a mass flow rate control principle. SF6 and N2 or CF4 gases connected to the system interface enter the corresponding pipe group of the gas mixing assembly through an external pressure reducing device. Controlled by a precision mass flow meter according to the set flow rate, the two gases are mixed in the mixing tank. After passing the mixing analyzer's test, the compressor compresses the mixed gas and delivers it to an external post-stage buffer tank, simultaneously entering the GIS gas chamber until the set pressure is reached, at which point it automatically stops. Built-in sensors and an intelligent monitoring system automatically suspend operation in case of abnormalities and promptly alert the user for inspection and handling, ensuring the safety and successful completion of the filling process. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of a sulfur hexafluoride-nitrogen mixing and charging device according to the present invention.

[0024] In the diagram, 100 is the mixing assembly, 110 is the exhaust pipe assembly, 120 is the product pipe assembly, 130 is the first mixing pipe assembly, and 140 is the second mixing pipe assembly.

[0025] 200 - Vacuum assembly, 210 - Vacuum pump, 220 - Vacuum tube assembly 1, 230 - Vacuum tube assembly 2, 240 - Vacuum tube assembly 3, 250 - Vacuum tube assembly 4. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] As the first embodiment of this utility model:

[0028] Please see Figure 1 A sulfur hexafluoride-nitrogen gas mixing and charging device includes: a gas mixing assembly 100, which is connected to a vacuum assembly 200 for evacuating the equipment. The gas mixing assembly 100 includes a gas mixing tank 150 for gas mixing. The upper end of the gas mixing tank 150 is sealed to the end of a second gas mixing pipe assembly 140, and the end of the gas mixing tank 150 is sealed to the end of a first gas mixing pipe assembly 130. A product pipe assembly 120 for discharging finished products is fixed to the upper right side of the gas mixing tank 150, and an exhaust pipe assembly 110 for venting is fixed to the lower right side of the gas mixing tank.

[0029] The vacuum assembly 200 includes a vacuum pump 210 for vacuuming. The inlet of the vacuum pump 210 is sealed to the end of the vacuum tube assembly 220, and the starting section of the vacuum tube assembly 220 is sealed to the right side of the product tube assembly 120. In actual use, the equipment also includes a gas replenishment calculation and processing module. The gas replenishment calculation and processing module performs subsequent gas replenishment operations through detection and calculation, in conjunction with the intelligent control system. The entire equipment is uniformly controlled and monitored in real time using a fully automatic PLC touch screen (the gas replenishment calculation and processing module and the intelligent control system are built into the fully automatic PLC touch screen). It achieves unmanned management and fully intelligent one-button operation. The various functional components of the equipment are assembled and installed in a mobile handcart. Valves one to eight have two states: green light and red light, corresponding to the open and closed states of the valves, respectively. Vacuum pump 210, evaporator one, evaporator two and compressor have two states: green light and red light, corresponding to the open and closed states, respectively. Flow meter one and flow meter two have two states: green light and red light, corresponding to the open and closed states, respectively. Pressure and temperature information are displayed above and below the flow meters. Pressure sensors one to seven display the pipe pressure of the corresponding pipe.

[0030] Specifically, by setting up the gas mixing component 100, the equipment can automatically pressurize the SF6 / N2 / CF4 mixed gas in actual use. The device adopts a modular design, and multiple functional modules can be flexibly combined to meet different on-site operation needs, providing users with highly customized solutions. It supports intelligent mixing and proportioning of the two gases and integrates multi-functional processing modules such as vacuuming, mixing and filling, and gas replenishment calculation. The entire operation process is uniformly controlled and monitored in real time through a fully automatic PLC touch screen, realizing unmanned management and fully intelligent one-button operation, significantly improving operation efficiency and safety, while reducing the risks and complexity of manual operation. With its high efficiency, intelligence, and environmental protection features, the device provides reliable technical support for gas management of power equipment. By setting up flow meter 2 and flow meter 1, the amount of SF6 gas and nitrogen entering can be accurately controlled.

[0031] As a second embodiment of this utility model:

[0032] Please see Figure 1 The exhaust pipe assembly 110 is equipped with a vent valve for controlling the switch. The product pipe assembly 120 is equipped with a pressure sensor four on the side near the mixing tank 150. A compressor and valve five are installed between the pressure sensor four and the starting end of the vacuum pipe assembly 220.

[0033] Valve 5 is located on the right side of the compressor, pressure sensor 5 is installed on the right side of product pipe assembly 120, and a product interface is provided at the right end of product pipe assembly 120.

[0034] A flow meter is installed at one end of the mixing pipe assembly 130 near the mixing tank 150. On the left side of the mixing pipe assembly 130, an evaporator 1, a pressure sensor 7, a valve 4, and a pressure sensor 3 are installed in sequence. The pressure sensor 7 is installed on the left side of the evaporator 1 and is located to the right of the valve 4. The pressure sensor 3 is located to the left of the valve 4. An SF6 interface is provided at the left end of the mixing pipe assembly 130.

[0035] A flow meter 2 is installed on the side of the mixing pipe assembly 2 140 near the upper end of the mixing tank 150. A branch pipe is installed on the left side of the mixing pipe assembly 2 140. From right to left, the main pipe of the mixing pipe assembly 2 140 is equipped with an evaporator 2, a pressure sensor 6, a valve 2, and a pressure sensor 1. The pressure sensor 6 is located on the left side of the evaporator 2 and on the right side of the connection between the branch pipe and the main pipe of the mixing pipe assembly 2 140. A valve 2 is located on the left side of the pressure sensor 6. The air intake ratio of flow meter 2 to flow meter 1 is 7:3. Flow meter 2 and flow meter 1 can accurately control the intake of SF6 gas and nitrogen gas. The ratio is the N2:SF6 ratio of 7:3.

[0036] Pressure sensor 1 is located on the left side of valve 2, and N2 interface 1 is provided on the left end of the main pipe of mixing pipe group 2 140. Valve 3 is installed on the right side of the branch pipe, pressure sensor 3 is installed on the left side of the branch pipe, and N2 interface 2 is provided on the left end of the branch pipe. In actual use, the equipment can output mixed gas concentration that can be set arbitrarily. It can be configured with any two gases of known concentration, such as SF6 / N2, C4F7N / CO2, C5F10O / CO2, C4F7N / Air, C5F10O / Air and other mixed gases.

[0037] The vacuum assembly 200 also includes a third vacuum tube group 240 and a fourth vacuum tube group 250. The third vacuum tube group 240 and the fourth vacuum tube group 250 are respectively arranged on the right side of the first vacuum tube group 220, and the third vacuum tube group 240 is placed on the left side of the fourth vacuum tube group 250.

[0038] The lower end of vacuum tube assembly 3 240 is partially sealed to mixing tube assembly 1 130 between evaporator 1 and flow meter 1 via valve 6. The lower end of vacuum tube assembly 4 250 is partially sealed to mixing tube assembly 2 140 between evaporator 2 and flow meter 2. In actual use, the final charging pressure is: during the mixing process, the pressure P5 at the product interface gradually increases. When the P5 pressure reaches the set final charging pressure, the mixing automatically stops.

[0039] N2 inflation pressure: Before starting the gas mixing, ensure that the N2 interface pressures P1 and P2 are greater than the N2 inflation pressure. If the pressure display is less than the inflation pressure, it means that the gas pressure at the interface is insufficient, and the gas mixing cannot be started at this time.

[0040] SF6 inflation pressure: Before starting the gas mixing, ensure that the SF6 interface pressure P3 is greater than the SF6 inflation pressure. If the pressure display is less than the inflation pressure, it means that the gas pressure at the interface is insufficient, and the gas mixing cannot be started at this time.

[0041] N2 pipeline pressure difference: When the difference between the pipeline pressure P6 of the N2 filling pipeline and the pressure P4 at the outlet of the gas storage tank is less than the set pipeline pressure difference, it indicates that the N2 filling pipeline pressure is too low and the mixing function is terminated.

[0042] SF6 pipeline pressure difference: When the difference between the pipeline pressure P7 of the SF6 filling pipeline and the pressure P4 at the outlet of the gas storage tank is less than the set pipeline pressure difference, it indicates that the SF6 filling pipeline pressure is too low and the mixing function is terminated.

[0043] Opening inflation pressure: When the pressure P4 at the outlet of the gas tank is greater than the opening inflation pressure, the compressor and valve V5 will open automatically. Under the action of the compressor, the mixed gas in the gas tank will be sent out of the product interface.

[0044] Closing the filling pressure: When the pressure P4 at the outlet of the gas tank is less than the closing filling pressure, the compressor and valve V5 will automatically close. After the gas tank is filled with enough gas, they will automatically open and continue to work.

[0045] Vacuum tube assembly 220 has valve 1 on its left side. Valve 1 is located between the connection between vacuum tube assembly 220 and vacuum tube assembly 230 and vacuum pump 210. Vacuum tube assembly 230 has valve 8 on its right side. Vacuum gauge is installed at the left end of vacuum tube assembly 230. Vacuum tube assembly 250 has valve 7 in its middle section. In actual use, the pipe diameter in the equipment is DN20 and the pipe length is 5 meters or 10 meters, which can be freely matched.

[0046] Based on the first embodiment described above, further, the gas mixing component 100 is paired with the vacuuming component 200. In actual use, when performing a vacuuming operation on the equipment (pressure sensors one to seven are hereinafter referred to as P1 to P7, and valves one to eight are hereinafter referred to as V1 to V8), the interface pressures P1, P2, P3, and P5 are observed to ensure that the interface pressure does not exceed 0.05 MPa. If the pressure reading is greater than 0.05 MPa, the pressure in the pipe at the interface is first emptied before performing the vacuuming operation. When the interface pressure meets the requirements, the start button in the PLC touch screen system is clicked, and the system begins to perform the equipment vacuuming operation: valves V2, V3, V4, V6, V7, V5, V1, V8 and vacuum pump 210 are opened in sequence, and the system begins to perform the equipment vacuuming function. After clicking the stop button, the equipment vacuuming function can be stopped, and valves V2, V3, V4, V6, V7, V5, V1, V8 and vacuum pump 210 are automatically closed.

[0047] When vacuuming the product is required, connect the product to be vacuumed to the product interface and observe the interface pressure P5. Ensure that the interface pressure does not exceed 0.05 MPa. If the pressure reading is greater than 0.05 MPa, the pressure should be released before vacuuming. When the interface pressure meets the requirements, click the start button, and the system will begin to perform the interface vacuuming operation: valves V1 and V8 and vacuum pump 210 will open in sequence, and the system will begin to perform the product vacuuming function. Click the stop button to stop the product vacuuming function, and valves V1, V8 and vacuum pump 210 will automatically close.

[0048] During automatic gas mixing, in the automatic gas mixing window of the PLC touch screen, click the clear button to reset the total accumulated amount of N2 and SF6 gas. Then, the amount of N2 and SF6 gas charged in this round will be displayed in the middle of the window. When a new round of gas charging begins, the charging amount of this round will start from 0. Connect nitrogen and sulfur hexafluoride gas to the N2 interface and SF6 interface, respectively, and observe the gas interface pressures P1, P2, and P3. Make sure that the interface pressure is greater than the lower limit of the charging pressure (which can be set in the system parameter setting window). If the pressure display is less than the lower limit of the charging pressure, it means that the gas pressure at the interface is insufficient. The corresponding gas should be connected to the interface first before the gas mixing operation is performed. When the interface pressure meets the requirements, click the start button, and the system will start to execute the automatic gas mixing operation: valves V2 (or V3), V4, evaporator one, evaporator two, flow meter one, and flow meter two will open automatically, and the system will start to execute the automatic gas mixing function.

[0049] During the gas mixing process, the pressure P4 at the outlet of the gas storage tank gradually increases. When the pressure P4 is greater than the opening charging pressure (which can be set in the parameter setting window), the compressor and valve V5 automatically open. Under the action of the compressor, the mixed gas in the mixing tank 150 is sent out of the product interface. At this time, the pressure P4 at the outlet of the mixing tank 150 begins to decrease. When the pressure P4 is less than the closing charging pressure (which can be set in the parameter setting window), the compressor and valve V5 automatically close. After the mixing tank 150 is filled with enough gas, it will automatically open again to continue working.

[0050] During the gas mixing process, the interface pressure P1 at N2 interface 1 gradually decreases. When P1 is less than the lower limit of the charging pressure (which can be set in the parameter setting window), valve V2 automatically closes, and then valve V3 automatically opens to continue charging N2 gas.

[0051] The entire device can automatically pressurize the mixed gas, achieving rapid, accurate, and stable filling operations for electrical equipment through pressure detection and intelligent control. When the mixed gas concentration inside the electrical equipment deviates from the rated value and adjustment is required, it can automatically calculate the required replenishment gas concentration based on the current concentration and pressure in the gas chamber, as well as the target concentration and pressure, and automatically perform the replenishment operation. The device's working pipelines are evacuated. The entire device adopts the mass flow method control principle. SF6 and N2 or CF4 gases connected to the system interface enter the corresponding pipe group of the mixing component 100 through an external pressure reducing device. The precision mass flow meter controls the flow rate according to the set flow rate. After the two gases are mixed in the mixing tank 150 (pre-stage buffer tank) and pass the test by the mixing analyzer (the mixing analyzer can be an existing commercial product, and the mixing analyzer is connected to the mixing tank 150 for gas mixing detection), the compressor is started to compress the mixed gas and deliver it to the external post-stage buffer tank, and simultaneously enter the GIS gas chamber. It will automatically stop when the set pressure is reached. It has built-in various sensors and intelligent monitoring system, which will automatically stop the operation in case of abnormality and promptly remind the user to check and deal with it, so as to ensure the safety and smooth completion of the filling process.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sulfur hexafluoride / nitrogen gas mixing and charging device comprising: The gas mixing assembly (100) is characterized in that the gas mixing assembly (100) is connected with a vacuum pumping assembly (200) for pumping the device, the gas mixing assembly (100) comprises a gas mixing tank for mixing gas, the upper end of the gas mixing tank is sealingly connected with the end of a gas mixing pipe group two (140), the end of the gas mixing tank is sealingly connected with the end of a gas mixing pipe group one (130), the right upper end of the gas mixing tank is fixed with a product pipe group (120) for discharging finished products, and the right lower end of the gas mixing tank is fixed with an exhaust pipe group (110) for discharging gas. The vacuum pumping assembly (200) comprises a vacuum pump (210) for pumping, and the gas inlet of the vacuum pump (210) is sealingly connected with the end of a vacuum pipe group one (220), and the initial section of the vacuum pipe group one (220) is sealingly connected with the right side of the product pipe group (120).

2. A sulfur hexafluoride / nitrogen gas mixing and charging device according to claim 1, characterized in that: The exhaust pipe group (110) is provided with a gas discharge valve for controlling the switch, the product pipe group (120) is provided with a pressure sensor four near the side of the gas mixing tank, and the pressure sensor four and the initial end of the vacuum pipe group one (220) are provided with a compressor and a valve five.

3. A sulfur hexafluoride / nitrogen gas mixing and charging device as claimed in claim 2, characterized in that: The valve five is arranged on the right side of the compressor, the right side of the product pipe group (120) is provided with a pressure sensor five, and the right end of the product pipe group (120) is provided with a product interface.

4. A sulfur hexafluoride / nitrogen gas mixing and charging device as set forth in claim 1, wherein: The gas mixing pipe group one (130) is provided with a flowmeter one near the end of the gas mixing tank, the left side of the gas mixing pipe group one (130) is sequentially provided with an evaporator one, a pressure sensor seven, a valve four and a pressure sensor three, the left side of the evaporator one is provided with the pressure sensor seven, the pressure sensor seven is arranged on the right side of the valve four, the pressure sensor three is arranged on the left side of the valve four, and the left end of the gas mixing pipe group one (130) is provided with an SF6 interface.

5. A sulfur hexafluoride / nitrogen gas mixing and charging device as claimed in claim 4, characterized in that: The gas mixing pipe group two (140) is provided with a flowmeter two near the upper end of the gas mixing tank, the left side of the gas mixing pipe group two (140) is provided with a branch pipe, and the main pipe part of the gas mixing pipe group two (140) is sequentially provided with an evaporator two, a pressure sensor six, a valve two and a pressure sensor one from right to left, the pressure sensor six is arranged on the left side of the evaporator two, the pressure sensor six is arranged on the right side of the connection between the branch pipe and the main pipe part of the gas mixing pipe group two (140), the left side of the pressure sensor six is provided with the valve two, and the gas inlet proportion of the flowmeter two and the flowmeter one is 7:

3.

6. A sulfur hexafluoride / nitrogen gas mixing and charging device as claimed in claim 5, characterized in that: The pressure sensor one is arranged on the left side of the valve two, and the left end of the main pipe part of the gas mixing pipe group two (140) is provided with an N2 interface one, the right side of the branch pipe is provided with a valve three, the left side of the branch pipe is provided with a pressure sensor three, and the left end of the branch pipe is provided with an N2 interface two.

7. A sulfur hexafluoride / nitrogen gas mixing and charging device as claimed in claim 6, characterized in that: The vacuum pumping assembly (200) further comprises a vacuum pipe group three (240) and a vacuum pipe group four (250), the right side of the vacuum pipe group one (220) is respectively provided with the vacuum pipe group three (240) and the vacuum pipe group four (250), and the vacuum pipe group three (240) is arranged on the left side of the vacuum pipe group four (250). The lower end of the vacuum pipe group three (240) is connected with the mixed gas pipe group one (130) through valve six, and the lower end of the vacuum pipe group four (250) is connected with the mixed gas pipe group two (140) between evaporator two and flow meter two.

8. A sulfur hexafluoride / nitrogen gas mixing and charging device as claimed in claim 7, characterized in that: The left side of the vacuum pipe group one (220) is provided with valve one, which is arranged between the connection of the vacuum pipe group one (220) and the vacuum pipe group two (230) and the vacuum pump (210). The right side of the vacuum pipe group two (230) is provided with valve eight, and the left end of the vacuum pipe group two (230) is provided with a vacuum gauge. The middle part of the vacuum pipe group four (250) is provided with valve seven.

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