Environment-friendly gas insulation ring main unit

Abstract

The invention relates to the technical field of insulating ring main units, in particular to an environment-friendly gas insulating ring main unit. Comprising a gas supply cabinet fixedly installed on a ring main unit, and a gas supply mechanism, a closed opening and closing mechanism and a gas extraction mechanism which are installed in the gas supply cabinet, and the gas supply mechanism comprises a nitrogen gas supply tank and a gas storage tank which are arranged in a gas supply chamber and used for supplying gas, and a gas exchange assembly and a gas supply pipe which are installed in the gas storage tank; the gas supply pipe is used for communicating the nitrogen gas supply tank and the gas storage tank with the interior of the ring main unit, the gas extraction mechanism comprises a gas extraction assembly, a filter box, and a moisture filter assembly and an oxygen filter assembly which are mounted in the filter box, and the gas extraction assembly comprises a gas extraction pipe, a high-speed gas extraction fan, a first gas guide pipe and a second gas guide pipe. According to the invention, high-voltage insulating gas can be provided for the interior of the ring main unit after gas leakage occurs in the ring main unit, so that the gas pressure in the ring main unit can be maintained, the normal operation of the ring main unit can be ensured in a period of time, and the occurrence of long-term power failure can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of insulated ring main units, and more particularly to an environmentally friendly gas insulated ring main unit. Background Art

[0002] In existing equipment, gas insulated ring main units are generally installed outdoors. After long-term use, there is a certain risk of air leakage, which may lead to a decline in insulation performance, a reduction in arc extinguishing ability, and an impact on the stability of the power grid. Air leakage in gas insulated ring main units is a serious problem that needs to be detected and handled in a timely manner to ensure the safe and reliable operation of the equipment. It is usually more convenient to handle gas insulated ring main units in the city, but when dealing with places where there are relatively few people and inconvenient transportation, such as rural areas, mountainous areas, and wilderness, it takes a long time for maintenance personnel to reach the ring main unit and repair it. In order to prevent power outages caused by long-term power grid outages, there is an urgent need for a device that can still operate stably for a long time when there is a slight air leakage in the ring main unit, maintain the internal insulation gas pressure, and provide a sufficient amount of insulating gas, so as to provide sufficient repair time for operators, and the ring main unit can still operate normally during this process. Summary of the Invention

[0003] Based on this, in view of the problems in the prior art, it is necessary to provide an environmentally friendly gas insulated ring main unit.

[0004] To solve the problems in the prior art, the technical solution adopted by the present invention is as follows: The present invention provides an environmentally friendly gas insulated ring main unit, which includes a gas supply cabinet fixedly installed on the ring main unit, a gas supply mechanism, a closed opening and closing mechanism, and an air extraction mechanism installed in the gas supply cabinet. The gas supply cabinet is provided with a driving chamber, a gas supply chamber, and a storage battery. An air extraction channel for the closed opening and closing mechanism to extract air is provided on the side wall of the gas supply chamber. The gas supply mechanism includes a nitrogen gas supply tank and a storage tank for supplying gas provided in the gas supply chamber, a gas exchange component and a gas supply pipe installed in the storage tank. The gas supply pipe is used to connect the nitrogen gas supply tank and the storage tank with the inside of the ring main unit. An electromagnetic valve is provided on the gas supply pipe. The closed opening and closing mechanism includes a sealed barrier door slidably provided on the side wall of the gas supply cabinet. The air extraction mechanism includes an air extraction component, a filtration box, and a moisture filtration component and an oxygen filtration component installed in the filtration box. The air extraction component includes an air extraction pipe, a high-speed air extraction fan, a first air guide pipe, and a second air guide pipe. The high-speed air extraction fan is provided in the driving chamber. The air extraction pipe is connected to the high-speed air extraction fan. The other end of the air extraction pipe is provided at the air extraction channel. One end of the first air guide pipe is connected to the high-speed air extraction fan. The other end of the first air guide pipe is connected to the air inlet of the filtration box. One end of the second air guide pipe is connected to the air outlet of the filtration box. The other end of the second air guide pipe is connected to the storage tank. The nitrogen gas supply tank and the storage tank are initially filled with nitrogen gas. The gas exchange component is used to separate the initial nitrogen gas in the storage tank from the subsequently filled gas.

[0005] Preferably, the moisture filter components and the oxygen filter components are each provided with several groups, and the several groups of moisture filter components and oxygen filter components are arranged in sequence in the filter box along the horizontal direction. The filter box includes an air separation channel, an air combination channel, an air separation pipe, a pipeline switch and a middle partition. There are several air separation pipes and they correspond one to one with the several groups of moisture filter components and oxygen filter components. A middle partition is provided between every two groups of oxygen filter components. A pipeline switch is provided on each air separation pipe. The air separation channel is fixedly installed at the bottom of the filter box, and the air combination channel is fixedly installed at the top of the filter box.

[0006] Preferably, the moisture filtering component includes an adsorption tower and a detachable interface, the adsorption tower is vertically arranged, both ends of the adsorption tower are connected to the gas distribution pipe through the detachable interface, and the adsorption tower is filled with an adsorbent.

[0007] Preferably, the oxygen filter assembly includes a sealing plate, a second sealing strip, a quick-plug chamber, a limit strip, a mounting plate, a through-tube rack, an exhaust hole, a separation membrane and a connecting pipe. The sealing plate is vertically arranged. The internal space in the filter box is divided into a plurality of deoxygenation cavities by an intermediate partition. The sealing plate is detachably mounted on the filter box. The sealing plate seals the deoxygenation cavity through a plurality of second sealing strips mounted thereon. A plurality of quick-plug chambers are provided. The plurality of quick-plug chambers are arranged in sequence along the vertical direction. A mounting plate, a through-tube rack, an exhaust hole and a separation membrane are installed in each quick-plug chamber. Two mounting plates are provided and are horizontally mounted at the upper and lower ends of the quick-plug chamber, respectively. The through-tube rack is through-arranged It is placed on two mounting plates, and several through-tube racks are provided. A separation membrane is installed on the outside of each through-tube rack. An exhaust hole for discharging oxygen is opened on the side wall of the quick-plug chamber away from the opening of the filter box. The side of the filter box away from the opening is connected with an oxygen exhaust pipe, and the other end of the oxygen exhaust pipe is connected to the outside of the gas supply cabinet. Sliding limit grooves for limiting installation are provided on the mounting plates and the inner walls of the oxygen filter assembly. A limit strip that slides with the sliding limit groove is provided on the outer wall of the quick-plug chamber. A rubber sealing strip is provided on the limit strip. Every two quick-plug chambers are connected through a connecting pipe. The second sealing strip corresponds to the quick-plug chamber one by one, and a pressure switch valve is provided on the connecting pipe.

[0008] Preferably, the closing and opening mechanism further includes a pushing and opening component, a transmission component, a metal barrier mesh cover and a first fixing frame. The first fixing frame is fixedly installed on the inner side wall of the air supply cabinet. The pushing and opening component is vertically installed in the driving chamber. The output end of the pushing and opening component is in transmission connection with the sealing barrier door. The transmission component is in transmission connection with the output end of the pushing and opening component. The metal barrier mesh cover is fixedly installed on the outer side wall of the air supply cabinet. The metal barrier mesh cover is located outside the air extraction channel. The air extraction component further includes a horn-shaped air extraction head and a rubber plug. The horn-shaped air extraction head is fixedly installed on the first fixing frame. The opening of the horn-shaped air extraction head faces the air extraction channel. The horn-shaped air extraction head is communicated with the air extraction pipe. The rubber plug is slidably installed on the horn-shaped air extraction head. The transmission component is in transmission connection with the rubber plug.

[0009] Preferably, the pushing and opening component includes a limit mounting plate, a limit rod, a first linear driver and a first push rod. The first linear driver is fixedly installed on the driving chamber. The sealing barrier door is composed of a first sealing strip, a transmission plate and a sealing sliding plate. The first sealing strip for sealing with the air extraction channel is installed on the sealing sliding plate. The sealing sliding plate is vertically arranged. The transmission plate is horizontally arranged at the bottom of the sealing sliding plate. A limit sliding groove for the sealing sliding plate to slide is arranged on the transmission plate. The first push rod is vertically arranged. The movable end of the first linear driver is fixedly connected with the first push rod. The other end of the first push rod is fixedly connected with the transmission plate. The limit rod is horizontally and fixedly installed on the sealing sliding plate. The limit mounting plate is vertically installed on the outer side wall of the air supply cabinet. A sliding groove and an arc-shaped hook groove are arranged on the limit mounting plate. The sliding groove is communicated with the arc-shaped hook groove. The sliding groove is vertically arranged. The limit rod is slidably arranged on the limit mounting plate through the sliding groove and the arc-shaped hook groove.

[0010] Preferably, the transmission component includes a rack, a driving gear, a collar, an annular mounting frame and a fixing rod. The rack is vertically slidably arranged on the first fixing frame. The rack is fixedly connected with the first push rod. The collar is coaxially arranged with the air extraction pipe and the horn-shaped air extraction head. The inner side wall of the collar is in threaded fit with the outer side walls of the air extraction pipe and the horn-shaped air extraction head. The outer side wall of the annular mounting frame is fixedly connected with the inner side wall of the collar. The annular mounting frame is fixedly connected with the rubber plug. The horn-shaped air extraction head is fixedly connected with the first fixing frame through the fixing rod. The driving gear is fixedly installed on the outer side wall of the collar. The collar is meshed with the driving gear.

[0011] Preferably, the air exchange component includes a second linear driver, a sealing partition, and a second push rod. The second linear driver is vertically and fixedly installed in the driving chamber. The second push rod is vertically arranged and coaxially arranged with the gas storage tank. The sealing partition is arranged inside the gas storage tank. The outer side wall of the sealing partition fits with the inner side wall of the gas storage tank. The bottom end of the second push rod is fixedly connected to the movable end of the second linear driver, and the top end of the second push rod is fixedly connected to the sealing partition. The second push rod is in sealed sliding fit with the gas storage tank. The interface of the second air duct and the gas storage tank is arranged on the side wall of the gas storage tank. An exhaust outlet is arranged at the bottom of the gas storage tank, and a one-way valve is arranged on the exhaust outlet. Two air supply ports are arranged on the gas storage tank, and the two air supply ports are respectively located at the top end and the side wall of the gas storage tank. Solenoid valves are arranged outside the two air supply ports, and the two air supply ports are both communicated with the air supply pipe.

[0012] Preferably, the air extraction component includes a booster pump. The booster pump is installed in the driving chamber and is located at one end of the second air duct close to the gas storage tank. A one-way valve is arranged on the second air duct.

[0013] The beneficial effects of the present invention compared with the prior art are as follows: 1. When it is found that gas leakage occurs inside the ring main unit, high-pressure gas is provided for the inside of the ring main unit through the air supply mechanism to maintain the air pressure inside the ring main unit, which can not only ensure the normal operation of the ring main unit but also prevent external air from flowing back into the ring main unit through the air leakage point after the air pressure decreases, causing potential safety hazards. In the initial stage of air leakage, the gas storage tank is used as the gas source for air supply, and in the later stage, the filtered compressed air is used to replace and fill the internal space of the gas storage tank. After the air supply mechanism supplies air for a period of time, when the nitrogen content in the gas storage tank decreases to a relatively low value, at this time, the air supply is switched to the mixed air supply of the nitrogen gas supply tank and the compressed air inside the gas storage tank. This method can not only ensure sufficient air supply but also further mix the compressed air, that is, reduce the oxygen content, improve the overall air supply time and air supply pressure of the air supply mechanism, increase the continuous use time of the equipment, and as much as possible ensure the normal and stable operation effect of the equipment.

[0014] 2. The present invention can extract air, compress and separate it, separate and remove moisture and oxygen, and introduce the remaining dry air into the gas storage tank for pressurized storage, and mix it with the nitrogen gas in the nitrogen gas supply tank and introduce it into the ring main unit when needed. The membrane separation method has the advantages of low energy consumption and no consumption of chemical reagents. After multiple-stage repeated separation, the oxygen content in the dry gas has been reduced to a relatively low level, thereby improving the isolation and insulation effect.

[0015] 3. The equipment can still keep the inside clean after being placed for a long time, and the equipment can quickly start the air extraction function when air extraction operation is required.

[0016] 4. At this time, the gas in the gas storage tank is the newly filled and filtered compressed air, which can be used as a new gas source to supply auxiliary gas inside the ring main unit, minimizing the impact of air leakage on the inside of the ring main unit to the greatest extent possible.

[0017] 5. The booster pump pressurizes the compressed air in the gas storage tank to increase the gas pressure. The one-way valve prevents backflow. Pressurization can increase the air pressure when the gas storage tank discharges gas, that is, it ensures that high-pressure gas can be introduced into the ring main unit, thereby increasing the air pressure inside the ring main unit. This ensures that in the case of air leakage in the ring main unit, the gas flow direction is from the inside to the outside, and the untreated air outside enters the ring main unit through the leakage point, thus maintaining the insulation environment inside the ring main unit for a long time. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of the gas supply cabinet in an environmentally friendly gas-insulated ring main unit; Figure 2 is an internal three-dimensional structural schematic of the gas supply cabinet in an environmentally friendly gas-insulated ring main unit Figure 1 ; Figure 3 is an internal side view of the gas supply cabinet in an environmentally friendly gas-insulated ring main unit; Figure 4 is an internal three-dimensional structural schematic of the gas supply cabinet in an environmentally friendly gas-insulated ring main unit Figure 2 ; Figure 5 is a partial three-dimensional structural schematic diagram of an environmentally friendly gas-insulated ring main unit; Figure 6 is a three-dimensional structural schematic diagram of the closing and opening mechanism in an environmentally friendly gas-insulated ring main unit; Figure 7 is a cross-sectional view of the air extraction mechanism and transmission components in an environmentally friendly gas-insulated ring main unit; Figure 8 is a front view of the air extraction mechanism in an environmentally friendly gas-insulated ring main unit; Figure 9 is a schematic diagram of the filter box and its internal structure in an environmentally friendly gas-insulated ring main unit; Figure 10 is a three-dimensional exploded view of the oxygen filtration component in an environmentally friendly gas-insulated ring main unit; Figure 11 is a three-dimensional exploded view of the internal structure of the quick plug-in chamber in an environmentally friendly gas-insulated ring main unit; Figure 12 is a cross-sectional view of the gas storage tank and gas exchange components in an environmentally friendly gas-insulated ring main unit.

[0019] The reference numerals in the figure are: 1, gas supply cabinet; 11, drive room; 12, gas supply chamber; 13, air extraction channel; 14, storage battery; 2, gas supply mechanism; 21, nitrogen gas supply tank; 22, gas storage tank; 23, air exchange component; 231, second linear driver; 232, sealing partition; 233, second push rod; 24, gas supply pipe; 3, closed opening and closing mechanism; 31, sealing barrier door; 311, first sealing strip; 312, transmission plate; 313, sealing sliding plate; 32, pushing opening and closing component; 321, limit mounting plate; 322, sliding groove; 323, arc-shaped hook groove; 324, limit rod; 325, first linear driver; 326, first push rod; 33, transmission component; 331, rack; 332, driving gear; 333, collar; 334, annular mounting frame; 335, fixed rod; 34, metal barrier mesh cover; 35, first fixing frame; 4, air extraction mechanism; 41, air extraction component; 411, air extraction pipe; 412, high-speed air extraction fan; 413, horn-shaped air extraction head; 414, rubber plug; 415, first air guide pipe; 416, second air guide pipe; 417, booster pump; 42, filter box; 421, air distribution channel; 422, air combination channel; 423, air distribution pipe; 424, pipeline switch; 425, intermediate partition; 426, sliding limit groove; 427, oxygen discharge pipe; 43, moisture filtering component; 431, adsorption tower; 432, detachable interface; 44, oxygen filtering component; 441, sealing plate; 442, second sealing strip; 443, quick plug-in chamber; 444, limit strip; 445, mounting plate; 446, through barrel frame; 447, exhaust hole; 448, separation membrane; 449, connecting pipe. Detailed implementation manners

[0020] In order to further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation manners.

[0021] As Figures 1 - 12An environmentally friendly gas-insulated ring main unit as shown, which includes a gas supply cabinet 1 fixedly installed on the ring main unit, and a gas supply mechanism 2, a closed opening and closing mechanism 3, and an air extraction mechanism 4 installed in the gas supply cabinet 1. A driving chamber 11, a gas supply chamber 12, and a storage battery 14 are provided in the gas supply cabinet 1. An air extraction channel 13 for the closed opening and closing mechanism 3 to extract air is provided on the side wall of the gas supply chamber 12. The gas supply mechanism 2 includes a nitrogen gas supply tank 21 for gas supply and a storage tank 22 provided in the gas supply chamber 12, a gas exchange component 23 installed in the storage tank 22, and a gas supply pipe 24. The gas supply pipe 24 is used to connect the nitrogen gas supply tank 21 and the storage tank 22 with the inside of the ring main unit. An electromagnetic valve is provided on the gas supply pipe 24. The closed opening and closing mechanism 3 includes a sealing barrier door 31 slidably provided on the side wall of the gas supply cabinet 1. The air extraction mechanism 4 includes an air extraction component 41, a filtration box 42, a moisture filtration component 43 and an oxygen filtration component 44 installed in the filtration box 42. The air extraction component 41 includes an air extraction pipe 411, a high-speed air extraction fan 412, a first air guide pipe 415 and a second air guide pipe 416. The high-speed air extraction fan 412 is provided in the driving chamber 11. The air extraction pipe 411 is communicated with the high-speed air extraction fan 412. The other end of the air extraction pipe 411 is provided at the air extraction channel 13. One end of the first air guide pipe 415 is communicated with the high-speed air extraction fan 412. The other end of the first air guide pipe 415 is communicated with the air inlet of the filtration box 42. One end of the second air guide pipe 416 is communicated with the air outlet of the filtration box 42. The other end of the second air guide pipe 416 is communicated with the storage tank 22. Initially, both the nitrogen gas supply tank 21 and the storage tank 22 are filled with nitrogen gas. The gas exchange component 23 is used to separate the initial nitrogen gas in the storage tank 22 from the subsequently filled gas.

[0022] When a gas leakage occurs inside the ring main unit, that is, when the air pressure sensor installed inside the ring main unit detects a decrease in the air pressure inside the ring main unit, at this time, the air supply mechanism 2 needs to provide high-pressure gas for the inside of the ring main unit to maintain the air pressure inside the ring main unit, which can not only ensure the normal operation of the ring main unit, but also prevent the outside air from flowing back into the ring main unit through the leakage point after the air pressure decreases, causing potential safety hazards. By providing a nitrogen gas supply tank 21 and a gas storage tank 22, nitrogen gas supply is achieved. In order to prevent the inability to continue providing insulating gas after the nitrogen gas is consumed, the air extraction mechanism 4 realizes the functions of air extraction, filtration, and compression. The atmosphere is pumped into the equipment for filtration, water vapor and oxygen are filtered from the air, and the filtered dry gas is compressed and stored in the used gas storage tank 22. In order to store as much nitrogen gas as possible in the air supply chamber 12, the inside of the gas storage tank 22 is also filled with nitrogen gas in the initial state. In the initial stage of leakage, the gas storage tank 22 is used as the gas source for air supply, and in the later stage, the filtered compressed air replaces and fills the internal space of the gas storage tank 22. After the air supply mechanism 2 supplies gas for a period of time, when the nitrogen gas volume in the gas storage tank 22 decreases to a lower value, at this time, it is switched to the mixed air supply of the nitrogen gas supply tank 21 and the compressed air inside the gas storage tank 22. This method can not only ensure sufficient gas supply, but also further mix the compressed air, that is, reduce the oxygen content, improve the overall air supply time and air supply pressure of the air supply mechanism 2, increase the continuous use time of the equipment, and ensure the normal and stable operation effect of the equipment as much as possible.

[0023] There are several groups of moisture filtration components 43 and oxygen filtration components 44. Several groups of moisture filtration components 43 and oxygen filtration components 44 are arranged in sequence along the horizontal direction inside the filtration box 42. The filtration box 42 includes a gas distribution channel 421, a gas combination channel 422, a gas distribution pipe 423, a pipeline switch 424, and an intermediate partition 425. There are several gas distribution pipes 423, which correspond one by one to several groups of moisture filtration components 43 and oxygen filtration components 44. An intermediate partition 425 is provided between every two groups of oxygen filtration components 44. A pipeline switch 424 is provided on each gas distribution pipe 423. The gas distribution channel 421 is fixedly installed at the bottom of the filtration box 42, and the gas combination channel 422 is fixedly installed at the top of the filtration box 42.

[0024] After the gas is introduced into the inside of the filtration box 42, the air is evenly introduced into several gas distribution pipes 423, and then introduced into several groups of moisture filtration components 43 and oxygen filtration components 44 for water removal and oxygen removal operations. This method can improve the efficiency of gas treatment, so as to ensure the effect of quickly realizing gas replenishment.

[0025] The moisture filtration component 43 includes an adsorption tower 431 and a detachable interface 432. The adsorption tower 431 is arranged vertically, and both ends of the adsorption tower 431 are connected to the gas distribution pipe 423 through the detachable interface 432. The adsorption tower 431 is filled with an adsorbent.

[0026] The material of the adsorbent is molecular sieve or activated alumina. The entire adsorption tower 431 can be quickly disassembled and replaced. The moisture filter assembly 43 can remove water and dry the relatively humid air to prevent water vapor from entering the ring network cabinet through the air supply to cause safety hazards.

[0027] The oxygen filter assembly 44 includes a sealing plate 441, a second sealing strip 442, a quick-plug chamber 443, a limiting strip 444, a mounting plate 445, a through-tube rack 446, an exhaust hole 447, a separation membrane 448 and a connecting pipe 449. The sealing plate 441 is vertically arranged. The internal space of the filter box 42 is divided into a plurality of deoxygenation cavities by the middle partition 425. The sealing plate 441 is detachably mounted on the filter box 42. The sealing plate 441 seals the deoxygenation cavity through a plurality of second sealing strips 442 mounted thereon. The quick-plug chamber 443 is provided with a plurality of quick-plug chambers 443, and the plurality of quick-plug chambers 443 are arranged in sequence along the vertical direction. Each quick-plug chamber 443 is provided with a mounting plate 445, a through-tube rack 446, an exhaust hole 447 and a separation membrane 448. The mounting plate 445 is provided with two and is horizontally mounted at the upper and lower ends of the quick-plug chamber 443, respectively. 46 is through-set on two mounting plates 445, and a plurality of through-tube racks 446 are provided, and a separation membrane 448 is installed on the outer side of each through-tube rack 446, and an exhaust hole 447 for discharging oxygen is opened on the side wall of the quick-plug chamber 443 away from the opening of the filter box 42, and an oxygen exhaust pipe 427 is connected to the side of the filter box 42 away from the opening, and the other end of the oxygen exhaust pipe 427 is connected to the outside of the gas supply cabinet 1, and a sliding limit groove 426 for limiting installation is provided on the inner side wall of the mounting plate 445 and the oxygen filter assembly 44, and a limit strip 444 that slides with the sliding limit groove 426 is provided on the outer side wall of the quick-plug chamber 443, and a rubber sealing strip is provided on the limit strip 444, and every two quick-plug chambers 443 are connected through a connecting pipe 449, and the second sealing strip 442 corresponds to the quick-plug chamber 443 one by one, and a pressure switch valve is provided on the connecting pipe 449.

[0028] When the oxygen filter assembly 44 is working, the dry gas that has completed the dehydration operation is introduced into the oxygen filter assembly 44. A plurality of quick-plug chambers 443 are arranged from bottom to top in the oxygen filter assembly 44. Each quick-plug chamber 443 is provided with a mounting plate 445 for separating oxygen. During this separation process, the dry gas can be filtered at multiple stages to maximize the deoxygenation effect. The through-tube rack 446 is used to connect each quick-plug chamber 443. The internal filler of the oxygen filter assembly 44 can be replaced. When the mounting plate 445 in the quick-plug chamber 443 is replaced, the oxygen filter assembly 44 can be replaced. After use, the quick-plug chamber 443 can be pulled out from the filter box 42 by opening the sealing plate 441. The quick-plug chamber 443 and the filter box 42 are detachably connected through the sliding limit groove 426 and the limit strip 444. When the sealing plate 441 is installed, the second sealing strip 442 set on the sealing plate 441 seals each quick-plug chamber 443 with the deoxygenation cavity, so that the dry gas can only be deoxygenated and filtered after passing through the mounting plates 445 inside the quick-plug chambers 443 in the vertical direction before it can be used later. This equipment can be quickly disassembled and maintained. When not in use, it can maintain the internal sealing state and increase the time for the efficient deoxygenation effect to be maintained. It is worth mentioning that the mounting plate 445 is an inorganic membrane, a polymer membrane or a hollow fiber membrane, which has different permeabilities to other gases such as oxygen and nitrogen. The pressure switch valve installed on the connecting pipe 449 can maintain a certain pressure difference between the inside of the quick-plug chamber 443 and the outside, so that the gas inside the quick-plug chamber 443 flows outward from the inside of the barrel rack 446. When the gas flows outward, it is separated by the separation membrane 448. Oxygen passes through the separation membrane 448 and is discharged outward, and is exported to the outside through the exhaust hole 447 and the oxygen discharge pipe 427. After the pressure reaches a certain level, the pressure switch valve opens, and the separated gas passes through the connecting pipe 449 and enters the next quick-plug chamber 443 for re-separation until it is finally exported out after multi-stage separation. Under the action of a certain pressure difference, oxygen is separated by passing through the mounting plate 445 first. The membrane separation method has the advantages of low energy consumption and no consumption of chemical reagents. After multiple stages of repeated separation, the oxygen content in the dry gas has been reduced to a low level, thereby improving the isolation and insulation effect.

[0029] The closed opening and closing mechanism 3 further includes a pushing opening and closing component 32, a transmission component 33, a metal barrier mesh cover 34 and a first fixing bracket 35. The first fixing bracket 35 is fixedly installed on the inner side wall of the air supply cabinet 1. The pushing opening and closing component 32 is vertically installed in the driving chamber 11. The output end of the pushing opening and closing component 32 is in transmission connection with the sealing barrier door 31. The transmission component 33 is in transmission connection with the output end of the pushing opening and closing component 32. The metal barrier mesh cover 34 is fixedly installed on the outer side wall of the air supply cabinet 1. The metal barrier mesh cover 34 is located outside the air extraction channel 13. The air extraction component 41 further includes a horn-shaped air extraction head 413 and a rubber plug 414. The horn-shaped air extraction head 413 is fixedly installed on the first fixing bracket 35. The opening of the horn-shaped air extraction head 413 points to the air extraction channel 13. The horn-shaped air extraction head 413 is communicated with the air extraction pipe 411. The rubber plug 414 is slidably installed on the horn-shaped air extraction head 413. The transmission component 33 is in transmission connection with the rubber plug 414.

[0030] When the closed opening and closing mechanism 3 works, the pushing opening and closing component 32 can push the sealing barrier door 31 to eject upwards. The sealing barrier door 31 releases the sealed connection with the side wall of the air supply cabinet 1 and opens the air extraction channel 13 on the side wall of the air supply cabinet 1, so that the air outside the air supply cabinet 1 can smoothly flow into the air supply cabinet 1. By setting the metal barrier mesh cover 34, larger impurities and the like can be blocked outside the air supply cabinet 1. When the pushing opening and closing component 32 works, it can drive the transmission component 33 to move. When the transmission component 33 moves, it can pull out the rubber plug 414 inside the horn-shaped air extraction head 413 from the horn-shaped air extraction head 413, so that the horn-shaped air extraction head 413 can realize the function of rapid air extraction. The rubber plug 414 ensures that the air extraction pipe 411 can be blocked when the air extraction mechanism 4 is not enabled, so that dust and other impurities cannot enter the inside of the air extraction pipe 411, and the equipment can still keep the inside clean after being placed for a long time.

[0031] The push opening and closing assembly 32 includes a limiting mounting plate 321, a limiting rod 324, a first linear driver 325 and a first push rod 326. The first linear driver 325 is fixedly mounted on the driving chamber 11. The sealing barrier door 31 is composed of a first sealing strip 311, a transmission plate 312 and a sealing sliding plate 313. The first sealing strip 311 for sealing with the exhaust channel 13 is mounted on the sealing sliding plate 313. The sealing sliding plate 313 is vertically arranged, and the transmission plate 312 is horizontally arranged at the bottom of the sealing sliding plate 313. The transmission plate 312 is provided with a limiting sliding groove for the sealing sliding plate 313 to slide. A push rod 326 is vertically arranged, the movable end of the first linear actuator 325 is fixedly connected to the first push rod 326, the other end of the first push rod 326 is fixedly connected to the transmission plate 312, the limit rod 324 is horizontally fixedly installed on the sealing sliding plate 313, the limit mounting plate 321 is vertically installed on the outer wall of the gas supply cabinet 1, the limit mounting plate 321 is provided with a sliding groove 322 and an arc hook groove 323, the sliding groove 322 is connected to the arc hook groove 323, the sliding groove 322 is vertically arranged, and the limit rod 324 is slidably arranged on the limit mounting plate 321 through the sliding groove 322 and the arc hook groove 323. In this embodiment, the first linear actuator 325 is an electric cylinder.

[0032] When the push-opening and closing assembly 32 is working, the first push rod 326 is pushed upward by the first linear driver 325. The upward movement of the first push rod 326 drives the transmission plate 312 to move upward. When the transmission plate 312 moves, it drives the sealing sliding plate 313 to move upward synchronously. The limiting mounting plate 321 and the limiting rod 324 guide and limit the movement of the sealing sliding plate 313. The limiting rod 324 can be slidably set in the sliding groove 322 and the arc hook groove 323, so that the sealing sliding plate 313 moves outward to the outside of the gas supply cabinet 1 while moving upward, and then moves vertically upward until it avoids the exhaust channel 13. When resetting, it first descends to a certain height, and then retracts into the gas supply cabinet 1, so that the first sealing strip 311 can fit and seal with the exhaust channel 13.

[0033] The transmission assembly 33 includes a rack 331, a driving gear 332, a collar 333, an annular mounting frame 334 and a fixing rod 335. The rack 331 is vertically slidably arranged on the first fixing frame 35. The rack 331 is fixedly connected to the first push rod 326. The collar 333 is coaxially arranged with the exhaust pipe 411 and the trumpet-shaped exhaust head 413. The inner wall of the collar 333 is threadedly engaged with the outer wall of the exhaust pipe 411 and the trumpet-shaped exhaust head 413. The outer wall of the annular mounting frame 334 is fixedly connected to the inner wall of the collar 333. The annular mounting frame 334 is fixedly connected to the rubber plug 414. The trumpet-shaped exhaust head 413 is fixedly connected to the first fixing frame 35 through the fixing rod 335. The driving gear 332 is fixedly installed on the outer wall of the collar 333. The collar 333 is meshed with the driving gear 332.

[0034] When the pushing and opening / closing assembly 32 works, the first push rod 326 moves to drive the rack 331 fixedly connected thereto to move up and down in the vertical direction. When the rack 331 is displaced, it drives the driving gear 332 meshed therewith to rotate, and then drives the collar 333 fixedly connected to the driving gear 332 to rotate synchronously. Since the collar 333 is threadedly connected to the outer side walls of the trumpet-shaped air extraction head 413 and the air extraction pipe 411, it can be displaced in the horizontal direction when the collar 333 rotates. Thus, the rubber plug 414 can be driven to displace synchronously through the horizontal movement of the collar 333, and the rubber plug 414 is pulled out from the trumpet-shaped air extraction head 413, realizing the communication between the trumpet-shaped air extraction head 413 and the outside air.

[0035] The air exchange assembly 23 includes a second linear driver 231, a sealing partition 232 and a second push rod 233. The second linear driver 231 is vertically and fixedly installed in the driving chamber 11. The second push rod 233 is vertically arranged and coaxially arranged with the gas storage tank 22. The sealing partition 232 is arranged inside the gas storage tank 22. The outer side wall of the sealing partition 232 fits with the inner side wall of the gas storage tank 22. The bottom end of the second push rod 233 is fixedly connected to the movable end of the second linear driver 231, and the top end of the second push rod 233 is fixedly connected to the sealing partition 232. The second push rod 233 is in sealed sliding fit with the gas storage tank 22. The interface of the second air duct 416 with the gas storage tank 22 is arranged on the side wall of the gas storage tank 22. An exhaust outlet is provided at the bottom of the gas storage tank 22, and a one-way valve is provided on the exhaust outlet. Two air supply ports are provided on the gas storage tank 22, and the two air supply ports are respectively located at the top end and the side wall of the gas storage tank 22. Solenoid valves are provided outside the two air supply ports, and the two air supply ports are both communicated with the air supply pipe 24. In this embodiment, the second linear driver 231 is also an electric cylinder.

[0036] While the gas storage tank 22 supplies gas, the air exchange assembly 23 works to compress the air inside the gas storage tank 22 upward, and fills the vacated space with the compressed air extracted and filtered by the air extraction mechanism 4. During this process, the sealing partition 232 gradually moves upward under the push of the second push rod 233, so that the nitrogen gas originally stored in the gas storage tank 22 continuously gathers upward and finally supplies gas to the air supply pipe 24 through the air supply port at the top end of the gas storage tank 22, and the other air supply port is in a closed state. When the second push rod 233 in the gas storage tank 22 is pushed to the top end, the gas in the gas storage tank 22 at this time is the newly filled and filtered compressed air, which can be used as a new gas source to supply auxiliary gas to the inside of the ring main unit, minimizing the impact of air leakage on the inside of the ring main unit.

[0037] The air extraction assembly 41 includes a booster pump 417. The booster pump 417 is installed in the driving chamber 11 and is located at one end of the second air duct 416 close to the gas storage tank 22. A one-way valve is provided on the second air duct 416.

[0038] The booster pump 417 boosts the compressed air in the gas storage tank 22 to increase the pressure of the gas. The one-way valve prevents backflow. Boosting can increase the air pressure when the gas storage tank 22 discharges gas, that is, it ensures that high-pressure gas can be introduced into the ring main unit, thereby increasing the air pressure inside the ring main unit. To ensure that in the case of air leakage in the ring main unit, the gas flow direction is from the inside to the outside, and the untreated external air enters the ring main unit through the leakage point, so as to maintain the insulation environment inside the ring main unit for a long time.

[0039] The above embodiments only represent one or several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. An environmentally friendly gas insulated ring main unit, characterized in that: The invention comprises a gas supply cabinet (1) fixedly mounted on a ring main unit, and a gas supply mechanism (2), a closing and opening mechanism (3) and a gas extraction mechanism (4) mounted in the gas supply cabinet (1). The gas supply cabinet (1) is provided with a driving chamber (11), a gas supply chamber (12) and a storage battery (14). A gas extraction passage (13) for extracting gas from the closing and opening mechanism (3) is provided on a side wall of the gas supply chamber (12). The gas supply mechanism (2) comprises a nitrogen gas supply tank (21) for supplying gas and arranged in the gas supply chamber (12). ) and a gas storage tank (22), and a ventilation assembly (23) and a gas supply pipe (24) installed in the gas storage tank (22), the gas supply pipe (24) is used to connect the nitrogen gas supply tank (21) and the gas storage tank (22) with the inside of the ring network cabinet, a solenoid valve is provided on the gas supply pipe (24), the closing and opening mechanism (3) includes a sealing barrier door (31) slidably arranged on the side wall of the gas supply cabinet (1), and the exhaust mechanism (4) includes an exhaust assembly (41) and a filter box (42) and an exhaust pipe (44) installed in the filter box ( The invention relates to a moisture filter component (43) and an oxygen filter component (44) in a driving chamber (11), wherein the air extraction component (41) comprises an air extraction pipe (411), a high-speed air extraction fan (412), a first air guide pipe (415) and a second air guide pipe (416), wherein the high-speed air extraction fan (412) is arranged in the driving chamber (11), the air extraction pipe (411) is connected to the high-speed air extraction fan (412), the other end of the air extraction pipe (411) is arranged at the air extraction channel (13), and the first air guide pipe (415) is connected to the second air guide pipe (416). ) is connected to a high-speed exhaust fan (412), the other end of the first air guide pipe (415) is connected to an air inlet of the filter box (42), one end of the second air guide pipe (416) is connected to an air outlet of the filter box (42), the other end of the second air guide pipe (416) is connected to an air storage tank (22), the nitrogen supply tank (21) and the air storage tank (22) are initially filled with nitrogen, and the ventilation component (23) is used to separate the initial nitrogen in the air storage tank (22) from the gas subsequently filled.

2. The environmentally friendly gas insulated ring main unit according to claim 1, characterized in that: The moisture filter components (43) and the oxygen filter components (44) are each provided with a plurality of groups. The plurality of groups of moisture filter components (43) and oxygen filter components (44) are each arranged in sequence in the filter box (42) along the horizontal direction. The filter box (42) comprises an air distribution channel (421), an air combination channel (422), an air distribution pipe (423), a pipeline switch (424) and a middle partition (425). The air distribution pipe (423) is provided with a plurality of groups corresponding to the plurality of moisture filter components (43) and oxygen filter components (44). A middle partition (425) is provided between every two groups of oxygen filter components (44). Each air distribution pipe (423) is provided with a pipeline switch (424). The air distribution channel (421) is fixedly mounted on the bottom of the filter box (42), and the air combination channel (422) is fixedly mounted on the top of the filter box (42).

3. The environmentally friendly gas insulated ring main unit according to claim 2, characterized in that: The moisture filtering component (43) comprises an adsorption tower (431) and a detachable interface (432); the adsorption tower (431) is arranged vertically; both ends of the adsorption tower (431) are connected to the gas distribution pipe (423) via the detachable interface (432); and the adsorption tower (431) is filled with an adsorbent.

4. The environmentally friendly gas insulated ring main unit according to claim 3, characterized in that: The oxygen filter assembly (44) comprises a sealing plate (441), a second sealing strip (442), a quick plug-in chamber (443), a limit strip (444), a mounting plate (445), a through-tube frame (446), an exhaust hole (447), a separation membrane (448) and a connecting pipe (449). The sealing plate (441) is arranged vertically. The internal space of the filter box (42) is divided into a plurality of deoxygenation cavities by a middle partition (425). The sealing plate (441) is detachably mounted on the filter box (42). The sealing plate (441) seals the deoxidation cavity through a plurality of second sealing strips (442) installed thereon. A plurality of quick-plug chambers (443) are provided. The plurality of quick-plug chambers (443) are arranged in sequence along the vertical direction. Each quick-plug chamber (443) is provided with a mounting plate (445), a through-tube frame (446), an exhaust hole (447) and a separation membrane (448). Two mounting plates (445) are provided and are respectively installed horizontally at the upper and lower ends of the quick-plug chamber (443). The rack (446) is arranged through the two mounting plates (445), and a plurality of through-tube racks (446) are provided. A separation membrane (448) is installed on the outer side of each through-tube rack (446). An exhaust hole (447) for exhausting oxygen is provided on the side wall of the quick plug-in chamber (443) away from the opening of the filter box (42). The side of the filter box (42) away from the opening is connected to an oxygen exhaust pipe (427). The other end of the oxygen exhaust pipe (427) is connected to the outside of the gas supply cabinet (1). The mounting plate (445) is provided with a plurality of through-tube racks (446). A separation membrane (448) is installed on the outer side of each through-tube rack (446). An exhaust hole (447) for exhausting oxygen is provided on the side wall of the quick plug-in chamber (443) away from the opening of the filter box (42). The side of the filter box (42) away from the opening is connected to an oxygen exhaust pipe (427). The other end of the oxygen exhaust pipe (427) is connected to the outside of the gas supply cabinet (1). 45) and the oxygen filter assembly (44) are provided on the inner side walls thereof with a sliding limit groove (426) for limiting installation, the outer side wall of the quick plug-in chamber (443) is provided with a limit strip (444) that slidably cooperates with the sliding limit groove (426), the limit strip (444) is provided with a rubber sealing strip, every two quick plug-in chambers (443) are connected via a connecting pipe (449), the second sealing strip (442) corresponds to the quick plug-in chamber (443) one by one, and the connecting pipe (449) is provided with a pressure switch valve.

5. The environmentally friendly gas insulated ring main unit according to claim 4, characterized in that: The closed opening and closing mechanism (3) further comprises a push opening and closing assembly (32), a transmission assembly (33), a metal barrier mesh cover (34) and a first fixed frame (35), wherein the first fixed frame (35) is fixedly mounted on the inner side wall of the gas supply cabinet (1), the push opening and closing assembly (32) is vertically mounted in the drive chamber (11), the output end of the push opening and closing assembly (32) is transmission-connected to the sealed barrier door (31), the transmission assembly (33) is transmission-connected to the output end of the push opening and closing assembly (32), and the metal barrier mesh cover (34) is fixedly mounted on the inner side wall of the gas supply cabinet (1). On the outer wall, a metal barrier mesh cover (34) is located outside the exhaust passage (13). The exhaust assembly (41) further comprises a trumpet-shaped exhaust head (413) and a rubber plug (414). The trumpet-shaped exhaust head (413) is fixedly mounted on the first fixing frame (35). The opening of the trumpet-shaped exhaust head (413) points to the exhaust passage (13). The trumpet-shaped exhaust head (413) is connected to the exhaust pipe (411). The rubber plug (414) is slidably mounted on the trumpet-shaped exhaust head (413). The transmission assembly (33) is in transmission connection with the rubber plug (414).

6. The environmentally friendly gas insulated ring main unit according to claim 5, characterized in that: The push opening and closing assembly (32) comprises a limit mounting plate (321), a limit rod (324), a first linear driver (325) and a first push rod (326); the first linear driver (325) is fixedly mounted on the driving chamber (11); the sealing barrier door (31) is composed of a first sealing strip (311), a transmission plate (312) and a sealing sliding plate (313); the first sealing strip (311) for sealing with the air extraction channel (13) is mounted on the sealing sliding plate (313); the sealing sliding plate (313) is vertically arranged; the transmission plate (312) is horizontally arranged at the bottom of the sealing sliding plate (313); the transmission plate (312) is provided with a limit sliding groove for the sealing sliding plate (313) to slide; A push rod (326) is vertically arranged, the movable end of the first linear drive (325) is fixedly connected to the first push rod (326), the other end of the first push rod (326) is fixedly connected to the transmission plate (312), the limit rod (324) is horizontally fixedly installed on the sealing sliding plate (313), the limit mounting plate (321) is vertically installed on the outer wall of the gas supply cabinet (1), the limit mounting plate (321) is provided with a sliding groove (322) and an arc-shaped hook groove (323), the sliding groove (322) is connected to the arc-shaped hook groove (323), the sliding groove (322) is vertically arranged, and the limit rod (324) is slidably arranged on the limit mounting plate (321) through the sliding groove (322) and the arc-shaped hook groove (323).

7. The environmentally friendly gas insulated ring main unit according to claim 6, characterized in that: The transmission assembly (33) comprises a rack (331), a driving gear (332), a collar (333), an annular mounting frame (334) and a fixing rod (335); the rack (331) is vertically slidably arranged on the first fixing frame (35); the rack (331) is fixedly connected to the first push rod (326); the collar (333) is coaxially arranged with the exhaust pipe (411) and the trumpet-shaped exhaust head (413); the inner side wall of the collar (333) is in contact with the exhaust pipe (411) and the trumpet-shaped exhaust head (413); The outer side walls of the trumpet-shaped exhaust head (413) are threadedly engaged, the outer side wall of the annular mounting frame (334) is fixedly connected to the inner side wall of the collar (333), the annular mounting frame (334) is fixedly connected to the rubber plug (414), the trumpet-shaped exhaust head (413) is fixedly connected to the first fixing frame (35) via a fixing rod (335), the driving gear (332) is fixedly mounted on the outer side wall of the collar (333), and the collar (333) is meshed with the driving gear (332).

8. The environmentally friendly gas insulated ring main unit according to claim 7, characterized in that: The ventilation assembly (23) comprises a second linear drive (231), a sealing baffle (232) and a second push rod (233); the second linear drive (231) is vertically fixedly installed in the drive chamber (11); the second push rod (233) is vertically arranged; the second push rod (233) is coaxially arranged with the gas storage tank (22); the sealing baffle (232) is arranged inside the gas storage tank (22); the outer side wall of the sealing baffle (232) is in contact with the inner side wall of the gas storage tank (22); the bottom end of the second push rod (233) is fixedly connected to the movable end of the second linear drive (231); The top end of the second push rod (233) is fixedly connected to the sealing partition (232), the second push rod (233) and the gas storage tank (22) are sealingly slidably matched, the interface between the second air guide pipe (416) and the gas storage tank (22) is arranged on the side wall of the gas storage tank (22), the bottom of the gas storage tank (22) is provided with an exhaust outlet, the exhaust outlet is provided with a one-way valve, the gas storage tank (22) is provided with two gas supply ports, the two gas supply ports are respectively located at the top end of the gas storage tank (22) and on the side wall of the gas storage tank (22), solenoid valves are provided outside the two gas supply ports, and the two gas supply ports are communicated with the gas supply pipe (24).

9. The environmentally friendly gas insulated ring main unit according to claim 8, characterized in that: The air extraction assembly (41) comprises a booster pump (417), which is installed in the drive chamber (11) and located at one end of the second air guide pipe (416) close to the air storage tank (22), and a one-way valve is provided on the second air guide pipe (416).

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