Environment-friendly gas insulation ring main unit

Abstract

The invention relates to the technical field of ring main units, in particular to an environment-friendly gas insulation ring main unit. In order to solve the problems that although a ring main unit adopting SF6 gas as an insulating medium becomes the mainstream of the industry due to performance advantages, a large amount of SF6 gas is discharged into the atmosphere during operations such as daily maintenance, troubleshooting or equipment replacement, and long-term serious negative effects are generated on the global climate, the invention provides the following technical scheme: the ring main unit comprises a cabinet body with an opening on one side; two groups of partition plates are fixedly connected in the cabinet body; the cabinet doors are hinged to the two sides of the cabinet body; the insulation box is installed in the cabinet body, and a load switch is installed in the insulation box; and the supplementing mechanism is arranged below the insulation box and used for discharging an insulation medium into the insulation box, and a positioning assembly is installed on the side face of the supplementing mechanism. The SF6 gas is effectively prevented from being directly discharged into the atmosphere, the harm of the SF6 gas to the environment is reduced, and the environment protection concept and the double-carbon target are met.

Description

Technical Field

[0001] The present invention relates to the technical field of ring main unit (RMU), in particular to an environmentally friendly gas-insulated RMU. Background Art

[0002] In modern power distribution systems, gas-insulated ring main units (RMUs) are widely used in urban power grids and industrial power distribution due to their significant advantages, including compact structure, small footprint, long maintenance cycles, and excellent insulation performance. RMUs using sulfur hexafluoride (SF6) gas as the insulating medium have long been the industry's mainstream choice due to their excellent insulation and arc-extinguishing properties. SF6 gas has extremely high chemical stability and electrical insulation strength, effectively ensuring the safe and reliable operation of RMUs under high voltage and high current conditions.

[0003] However, with the increasing attention paid to environmental protection around the world, the environmental problems of SF6 gas have gradually become prominent. When performing routine maintenance, troubleshooting or equipment replacement on ring network cabinets that use SF6 gas insulation, the cabinet body needs to be opened. At this time, a large amount of SF6 gas filled in the cabinet will inevitably be discharged into the atmosphere. SF6 is a potent greenhouse gas with an extremely high global warming potential (GWP), which will have a long-term and serious negative impact on the global climate. At the same time, the emission of SF6 gas also violates the current development concept of energy conservation, emission reduction, and green environmental protection, and is contrary to the requirements for promoting the national "dual carbon" goals. In view of this, the present invention proposes an environmentally friendly gas-insulated ring network cabinet. Summary of the Invention

[0004] The purpose of the present invention is to propose an environmentally friendly gas-insulated ring main unit (RMU) to address the problem in the background technology that although the ring main unit (RMU) using SF6 gas as the insulating medium has become the mainstream in the industry due to its performance advantages, a large amount of SF6 gas is discharged into the atmosphere during daily maintenance, fault repair or equipment replacement, which has a long-term serious negative impact on the global climate.

[0005] The technical solution of the present invention is as follows: an environmentally friendly gas-insulated ring network cabinet, comprising a cabinet body with an opening on one side, wherein two sets of partitions are fixedly connected to the cabinet body; cabinet doors are hinged on both sides of the cabinet body; an insulating box installed in the cabinet body, wherein a load switch is installed in the insulating box; a replenishing mechanism is arranged below the insulating box, wherein the replenishing mechanism is used to discharge insulating medium into the insulating box, and a positioning assembly is installed on the side of the replenishing mechanism; an extraction mechanism is installed on the top of the insulating box, wherein the extraction mechanism is used to suck out the gas in the insulating box and compress it for storage; and a connecting assembly is arranged below the insulating box, wherein the connecting assembly is used to replenish fresh air into the insulating box.

[0006] Optionally, the cabinet door includes a first door panel hinged on one side of the cabinet body, and a group of second door panels and two groups of third door panels are hinged on the other side of the cabinet body, and the second door panel is provided with pressure grooves on both sides, and the third door panel is installed with a pressure block corresponding to the pressure groove on the side close to the second door panel, and multiple groups of lock blocks are fixedly connected between the two groups of partitions, and lock bodies corresponding to the lock blocks are installed on the first door panel, the second door panel and the third door panel.

[0007] Optionally, the insulating box includes an inner box body arranged on the side of a group of partitions away from another group of partitions, an outer box body is arranged on the outside of the inner box body, the outer box body is fixedly connected to a group of partitions and a cabinet body, multiple groups of first fixing columns are fixedly connected between the inner box body and the outer box body, the load switch is installed in the inner box body, and the load switch connection line passes through the inner box body and the outer box body and is sealed by a rubber ring, the inner box body and the outer box body are both provided with openings in the same direction as the cabinet body, a first cover plate is provided on one side of the inner box body opening, a second cover plate is provided on one side of the outer box body opening, the second cover plate is fixedly connected to the second door panel, multiple groups of second fixing columns are fixedly connected between the first cover plate and the second cover plate, and rubber pads are installed on one side of the inner box body and the outer box body openings.

[0008] Optionally, the replenishing mechanism includes a first air inlet pipe installed at the bottom of the inner box and connected thereto, the first air inlet pipe passes through the outer box and is connected to a gas storage bottle, a first shut-off valve is installed at the air inlet end of the gas storage bottle, a first pressure gauge is also provided on the gas storage bottle, and a first control valve is installed on the first air inlet pipe.

[0009] Optionally, the positioning assembly is used to fix the position of the gas cylinder, and the positioning assembly includes a positioning seat arranged on the side of the gas cylinder away from the cabinet door, a positioning block is provided on the side of the gas cylinder away from the positioning seat, the positioning block is fixedly connected to a connecting plate on the side close to the partition, the connecting plate is rotatably connected to the side of the partition, the positioning block is fixedly connected to a pressure plate at one end away from the connecting plate, an elastic plate is provided on the side of the pressure plate away from the gas cylinder, one end of the elastic plate is rotatably connected to a first fixing seat, and a bolt is installed at the other end of the elastic plate, the bolt passes through the elastic plate and is threadedly connected to a second fixing seat, and the first fixing seat and the second fixing seat are both fixedly connected to the inner wall of the cabinet.

[0010] Optionally, the extraction mechanism includes a first air outlet pipe installed on the top of the inner box body and connected thereto, and the extraction mechanism also includes a second air outlet pipe installed on the top of the outer box body and connected thereto, the first air outlet pipe and the second air outlet pipe are connected to a first connecting pipe via a three-way joint, one end of the first connecting pipe is connected to an air cylinder, the end of the air cylinder away from the partition is fixedly connected to a second connecting pipe, the other end of the second connecting pipe is connected to a waste gas bottle, a second stop valve is installed at the air inlet end of the waste gas bottle, and a second pressure gauge is also provided on the waste gas bottle, and push rod motors are installed in the two groups of partitions, the output end of the push rod motor passes through one side of the air cylinder and is fixedly connected to a piston block, and the piston block is slidably connected in the air cylinder.

[0011] Optionally, a second control valve is installed on the first air outlet pipe, a third control valve is installed on the second air outlet pipe, a first one-way valve is installed on the first connecting pipe, and a second one-way valve is installed on the second connecting pipe.

[0012] Optionally, the connecting component includes a second air inlet pipe installed at the bottom of the inner box and connected thereto, and the connecting component also includes a third air inlet pipe installed through the bottom of the outer box, one end of the third air inlet pipe is located between the inner box and the outer box, and is diagonally distributed with one end connected to the second air outlet pipe and the outer box, a partition frame is fixedly connected to the inner wall of the cabinet, one side of the partition frame is fixedly connected to the cabinet, the other end of the third air inlet pipe and one end of the second air inlet pipe both pass through a side wall of the partition frame, the cabinet and the third door panel are provided with shutters at corresponding positions of the partition frame, and filter cotton is installed at the position of the shutters, a fourth control valve is installed on the second air inlet pipe, and a fifth control valve is installed on the third air inlet pipe.

[0013] Optionally, baffles are provided above the first air intake pipe and the second air intake pipe, the diameter of the baffles is larger than the diameter of the first air intake pipe and the second air intake pipe, and multiple groups of connecting columns are fixedly connected between the baffles and the inner box.

[0014] Optionally, a control box is also installed on the inner wall of the cabinet, and multiple gas detectors are installed on the inner box and the outer box. Flow meters are also provided at both ends of the multiple control valves. The multiple control valves, push rod motors, flow meters and gas detectors are all electrically connected to the control box.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] The present invention adopts a double-layer protective structure design of the inner and outer boxes, and cooperates with rubber pads to form a multi-stage sealing system. When the rubber pad of the inner box is corroded and fails by the decomposition products of sulfur hexafluoride gas, the gas only leaks between the two layers of the box, avoiding direct discharge into the atmosphere. At the same time, the extraction mechanism can extract the gas in the insulation box and store it in a waste gas bottle, realizing the centralized harmless treatment of sulfur hexafluoride gas; the connecting component can replenish fresh air during the extraction to maintain the air pressure balance, effectively reducing the environmental emission of sulfur hexafluoride gas and reducing the harm to the atmospheric environment, which is in line with the green environmental protection concept and the "dual carbon" goal.

[0017] Furthermore, the cabinet door adopts a combined structure of the first door panel, the second door panel and the third door panel, and cooperates with the lock block and the lock body to facilitate targeted maintenance of different areas inside the cabinet. The gas cylinder of the replenishment mechanism is fixed by a positioning component, and the quick-connect joint design facilitates disassembly and assembly as well as gas replenishment. Each control valve, push rod motor, flow meter and gas detector are electrically connected to the control box to achieve automated control. The gas detector can monitor the gas concentration in real time. Once the rubber pad of the inner box body ages, the control box can promptly remind the staff through the remote transmission module to prevent failures in advance, thereby improving maintenance efficiency and equipment operation safety.

[0018] In summary, the present invention effectively avoids the direct emission of SF6 gas into the atmosphere, reduces its harm to the environment, and complies with the green environmental protection concept and the "dual carbon" goal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structural diagram of environmentally friendly gas insulated ring main unit is given;

[0020] Figure 2 yes Figure 1 A magnified schematic diagram of point A in the middle;

[0021] Figure 3 yes Figure 1 Schematic diagram of the cross-section structure;

[0022] Figure 4 is a cross-sectional schematic diagram of the inner box;

[0023] Figure 5 This is a schematic diagram after the second door panel is opened;

[0024] Figure 6 yes Figure 5 A magnified schematic diagram of point B in the middle;

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of the cylinder.

[0026] Reference numerals:

[0027] 1. Cabinet; 11. Partition;

[0028] 2. Cabinet door; 21. First door panel; 22. Second door panel; 23. Third door panel; 24. Press groove; 25. Press block;

[0029] 3. Lock block; 31. Lock body;

[0030] 4. Insulation box; 41. Inner box; 42. Outer box; 43. First fixing post; 44. First cover; 45. Second cover; 46. Second fixing post; 47. Rubber pad;

[0031] 5. Supplement mechanism; 51. First air inlet pipe; 52. Air storage cylinder; 521. First stop valve; 522. First air pressure gauge; 53. First control valve;

[0032] 6. Positioning assembly; 61. Positioning seat; 62. Positioning block; 63. Connecting plate; 64. Pressing plate; 65. Elastic plate; 66. First fixing seat; 67. Bolt; 68. Second fixing seat;

[0033] 7. Extraction mechanism; 71. First air outlet pipe; 72. Second air outlet pipe; 73. First connecting pipe; 74. Air cylinder; 75. Second connecting pipe; 76. Waste gas bottle; 77. Piston block; 78. Push rod motor; 79. Second control valve; 710. Third control valve; 711. First one-way valve; 712. Second one-way valve; 761. Second stop valve; 762. Second pressure gauge;

[0034] 8. Connecting assembly; 81. Second air inlet pipe; 82. Third air inlet pipe; 83. Partition frame; 84. Shutter; 85. Fourth control valve; 86. Fifth control valve;

[0035] 9. Baffle; 91. Connecting column. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

[0038] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0041] Example

[0042] like Figure 1 and Figure 3 As shown, the environmentally friendly gas-insulated ring main unit proposed in the present invention includes a cabinet body 1 with an opening on one side. Two sets of partitions 11 are fixedly connected in the cabinet body 1 to divide the cabinet body 1 into two areas, which can also be further divided to install basic electrical components of the ring main unit.

[0043] For further information, see Figure 1 、 Figure 2 and Figure 5 The ring main unit (RMC) includes cabinet doors 2 hinged to both sides of a cabinet body 1. The cabinet doors 2 include a first door panel 21 hinged to one side of the cabinet body 1, and a second door panel 22 and two third door panels 23 hinged to the other side of the cabinet body 1. The first, second, and third door panels 21, 22, and 23 seal the open side of the cabinet body 1. A pressing groove 24 is provided on both sides of the second door panel 22. A pressing block 25 corresponding to the pressing groove 24 is installed on the side of the third door panel 23 adjacent to the second door panel 22. After the two sets of third door panels 23 are installed, the tightness of the second door panel 22 and the cabinet body 1 can be further improved, ensuring the sealing of the insulation box 4. Multiple sets of lock blocks 3 are fixedly connected between the two sets of partitions 11. Lock bodies 31 corresponding to the lock blocks 3 are installed on the first, second, and third door panels 21, 22, and 23. The lock blocks 3 cooperate with the lock bodies 31 to achieve the closing and locking of the first, second, and third door panels 21, 22, and 23.

[0044] Furthermore, Figure 3 and Figure 4 As shown, the ring main unit further includes an insulating box 4 installed in the cabinet 1. A load switch is installed in the insulating box 4. When the insulating box 4 is filled with an insulating medium, namely, sulfur hexafluoride gas, insulation is achieved. The insulating box 4 includes an inner box 41 disposed on the side of one set of partitions 11 away from the other set of partitions 11. An outer box 42 is disposed outside the inner box 41. The outer box 42 is fixedly connected to the set of partitions 11 and the cabinet 1. Multiple sets of first fixing columns 43 are fixedly connected between the inner box 41 and the outer box 42, and the positions of the inner box 41 and the outer box 42 are fixed. The load switch is installed in the inner box 41, and the load switch connection circuit passes through the inner box 41 and the outer box 42 and is sealed by a rubber ring. When the inner box 41 is filled with the insulating medium, namely, sulfur hexafluoride gas, insulation is achieved. Both the inner box 41 and the outer box 42 are provided with an opening in the same direction as the cabinet 1. A first cover plate 44 is provided on one side of the opening of the inner box 41, and a second cover plate 45 is provided on the other side of the opening of the outer box 42. The second cover plate 45 is fixedly connected to the second door panel 22. Multiple sets of second fixing columns 46 are fixedly connected between the first cover plate 44 and the second cover plate 45. When the second door panel 22 rotates, the first cover plate 44 and the second cover plate 45 are driven toward the inner box 41 and the outer box 42, sealing the opening side of the inner box 41 and the outer box 42. This creates a sealed space in the inner box 41 and prevents leakage of sulfur hexafluoride gas. Rubber gaskets 47 are installed on the opening side of the inner box 41 and the outer box 42 to improve the sealing performance. Since the decomposition products of sulfur hexafluoride gas produced under the action of the electric arc, such as SOF2, SO, F2, etc., are weakly corrosive, they will gradually erode the rubber molecular chains of the rubber pad 47, causing micro cracks. Through the double-layer protection design of the inner box 41 and the outer box 42, when the rubber pad 47 on the inner box 41 fails, the sulfur hexafluoride gas will only enter between the inner box 41 and the outer box 42 and will not directly enter the atmosphere.

[0045] For details, please refer to Figure 3 、 Figure 5 and Figure 6The ring main unit includes a replenishing mechanism 5 disposed below the insulation box 4. The replenishing mechanism 5 is used to discharge insulating medium into the insulation box 4. The replenishing mechanism 5 includes a first air inlet pipe 51 installed at the bottom of the inner box 41 and in communication therewith. The first air inlet pipe 51 passes through the outer box 42 and is connected to a gas cylinder 52. The first air inlet pipe 51 and the gas cylinder 52 are connected by a quick-connect connector for easy assembly and disassembly. The gas cylinder 52 stores high-pressure sulfur hexafluoride gas. A first shut-off valve 521 is installed at the inlet end of the gas cylinder 52 to control whether the gas cylinder 52 discharges sulfur hexafluoride gas. The gas cylinder 52 is also equipped with a first pressure gauge 522 for monitoring the remaining sulfur hexafluoride gas in the gas cylinder 52. A first control valve 53 is installed on the first air inlet pipe 51. Once activated, the first pressure gauge 522 controls the first control valve 53 to determine whether sulfur hexafluoride gas is discharged into the inner box 41.

[0046] like Figure 6 As shown, a positioning assembly 6 is mounted on the side of the replenishing mechanism 5. The positioning assembly 6 is used to fix the position of the gas cylinder 52. The positioning assembly 6 includes a positioning seat 61 disposed on the side of the gas cylinder 52 away from the cabinet door 2. The position of the positioning seat 61 is fixed. A positioning block 62 is disposed on the side of the gas cylinder 52 away from the positioning seat 61. When the positioning block 62 approaches the positioning seat 61, it squeezes the gas cylinder 52 to fix it. A connecting plate 63 is fixedly connected to the side of the positioning block 62 near the partition 11. The connecting plate 63 is rotatably connected to the side of the partition 11. The arrangement of the connecting plate 63 allows the positioning block 62 to be rotatably connected to the side of the partition 11. The positioning block 62 is fixedly connected to a pressure plate 64 at one end away from the connecting plate 63, and an elastic plate 65 is provided on the side of the pressure plate 64 away from the gas cylinder 52. One end of the elastic plate 65 is rotatably connected to a first fixing seat 66, and a bolt 67 is installed at the other end of the elastic plate 65. The bolt 67 passes through the elastic plate 65 and is threadedly connected to a second fixing seat 68. The first fixing seat 66 and the second fixing seat 68 are both fixedly connected to the inner wall of the cabinet 1. By tightening the bolt 67, the elastic plate 65 is driven to approach the pressure plate 64, and at the same time, the pressure plate 64 is squeezed, and the positioning block 62 is driven to squeeze the gas cylinder 52, thereby fixing the position of the gas cylinder 52.

[0047] For further information, see Figure 3 、 Figure 5 and Figure 7The above-mentioned ring network cabinet includes an extraction mechanism 7 installed on the top of the insulation box 4. The extraction mechanism 7 is used to suck out the gas in the insulation box 4 and compress it for storage. The extraction mechanism 7 includes a first gas outlet pipe 71 installed on the top of the inner box body 41 and connected thereto. The first gas outlet pipe 71 is used to discharge the gas in the inner box body 41. The extraction mechanism 7 also includes a second gas outlet pipe 72 installed on the top of the outer box body 42 and connected thereto. The second gas outlet pipe 72 is used to discharge the gas in the inner box body 41 and the second gas outlet pipe 72. The first gas outlet pipe 71 and the second gas outlet pipe 72 are connected to a first connecting pipe 73 through a three-way joint. One end of the first connecting pipe 73 is connected to an air cylinder 74. The first gas outlet pipe 71 and the second gas outlet pipe 72 are both connected to the air cylinder 74 through the first connecting pipe 73. A push rod motor 78 is installed in the two sets of partitions 11. The output end of the push rod motor 78 passes through one side of the gas cylinder 74 and is fixedly connected to a piston block 77. The piston block 77 is slidably connected to the gas cylinder 74. After starting, the push rod motor 78 drives the piston block 77 to slide in the gas cylinder 74, thereby pushing the gas therein. A second connecting pipe 75 is fixedly connected to the end of the gas cylinder 74 away from the partition 11. The other end of the second connecting pipe 75 is connected to a waste gas bottle 76. The waste gas bottle 76 is used to store gas containing sulfur hexafluoride for centralized harmless treatment. A second shut-off valve 761 is installed at the air inlet end of the waste gas bottle 76 for sealing the waste gas bottle 76 to prevent gas leakage when the waste gas bottle 76 is removed. A second barometer 762 is also provided on the waste gas bottle 76 for monitoring the pressure in the waste gas bottle 76. A second control valve 79 is installed on the first outlet pipe 71, a third control valve 710 is installed on the second outlet pipe 72, a first check valve 711 is installed on the first connecting pipe 73, and a second check valve 712 is installed on the second connecting pipe 75. When sucking gas out of the inner box 41, the second control valve 79 opens, the third control valve 710 closes, and the push rod motor 78 is activated to drive the piston block 77 away from the second connecting pipe 75. The second check valve 712 prevents the gas in the second connecting pipe 75 from flowing back, and the gas in the inner box 41 is sucked into the gas cylinder 74 through the first connecting pipe 73 and the first outlet pipe 71. The push rod motor 78 then drives the piston block 77 toward the second connecting pipe 75, pushing the gas in the gas cylinder 74 to move. The first check valve 711 prevents the gas from entering the first connecting pipe 73, and the gas enters the waste gas bottle 76 through the second connecting pipe 75 for storage. When the gas in the outer box body 42 is sucked out, the second control valve 79 is closed, the third control valve 710 is opened, and the push rod motor 78 is started to drive the piston block 77 to reciprocate and send the gas between the inner box body 41 and the outer box body 42 into the waste gas bottle 76 for storage.

[0048] Furthermore, Figure 3As shown, the ring main unit also includes a connecting assembly 8 disposed below the insulating box 4, which is used to replenish fresh air into the insulating box 4. The connecting assembly 8 includes a second air inlet pipe 81 installed at the bottom of the inner box 41 and connected thereto. The connecting assembly 8 also includes a third air inlet pipe 82 extending through the bottom of the outer box 42. The second and third air inlet pipes 81 and 82 facilitate the replenishment of air into the inner and outer boxes 41 and 42 when the gas is extracted by the extraction mechanism 7, thereby preventing the pressure from being too low. One end of the third air inlet pipe 82 is located between the inner and outer boxes 41 and 42, and is diagonally connected to the second air outlet pipe 72 and the outer box 42. This allows the air introduced by the third air inlet pipe 82 to more efficiently replace the gas between the inner and outer boxes 41 and 42 when the second air outlet pipe 72 extracts gas. A partition frame 83 is fixedly connected to the inner wall of the cabinet 1. One side of the partition frame 83 is fixedly connected to the cabinet 1. The other end of the third air inlet pipe 82 and one end of the second air inlet pipe 81 both extend through a side wall of the partition frame 83. Louvers 84 are installed at positions corresponding to the cabinet 1 and the third door panel 23 relative to the partition frame 83. Filter cotton is installed at the position of the louvers 84 to facilitate the entry of air into the second and third air inlet pipes 81, 82. This effectively filters dust from the air, preventing it from contacting internal electrical equipment and causing malfunctions. A fourth control valve 85 is installed on the second air inlet pipe 81, and a fifth control valve 86 is installed on the third air inlet pipe 82. These valves facilitate separation when air is not being supplied, preventing sulfur hexafluoride gas from venting from the insulation box 4 through the second and third air inlet pipes 81, 82.

[0049] Baffles 9 are provided above the first air inlet pipe 51 and the second air inlet pipe 81. The diameter of the baffle 9 is larger than the diameter of the first air inlet pipe 51 and the second air inlet pipe 81. Multiple sets of connecting columns 91 are fixedly connected between the baffle 9 and the inner box body 41, so that when the gas enters the inner box body 41, it impacts the baffle 9 and then disperses, so that the gas is injected into the inner box body 41 from bottom to top, so as to improve the replacement efficiency of the gas in the inner box body 41.

[0050] A control box is also mounted on the inner wall of cabinet 1. Multiple gas detectors are installed on both the inner and outer boxes 41, 42. Flowmeters are also installed at both ends of the aforementioned control valves. The aforementioned control valves, push rod motor 78, flowmeters, and gas detectors are all electrically connected to the control box, facilitating automated control. Furthermore, the gas detectors allow the detection of sulfur hexafluoride gas when the rubber pads 47 on the sides of inner box 41 age and sulfur hexafluoride gas enters the space between inner and outer boxes 41, 42. This allows the control box to control the remote transmission module to alert personnel to perform maintenance.

[0051] In this embodiment, the cabinet body 1 is divided into spaces by two groups of partitions 11 for installing basic electrical components. The cabinet door 2 is composed of a first door panel 21 hinged on one side of the cabinet body 1, a group of second door panels 22 hinged on the other side, and two groups of third door panels 23. The closing and locking are achieved by the lock block 3 cooperating with the lock body 31. The pressure grooves 24 on both sides of the second door panel 22 cooperate with the pressure blocks 25 of the third door panel 23 to ensure that the opening of the cabinet body 1 is well sealed after the cabinet door 2 is closed. The insulating box 4 is composed of an inner box body 41 and an outer box body 42. The inner box body 41 is used to install the load switch and is filled with sulfur hexafluoride gas to achieve insulation of the electrical components. The outer box body 42 and the inner box body 41 are fixed in position by a first fixing column 43. The openings of the inner box body 41 and the outer box body 42 are sealed by a first cover plate 44 and a second cover plate 45 respectively, and a rubber pad 47 is provided at the opening. The two-layer protective structure can effectively prevent the leakage of sulfur hexafluoride gas. When the rubber pad 47 is corroded and becomes ineffective due to the decomposition products of the sulfur hexafluoride gas, the gas will only leak into the space between the inner box 41 and the outer box 42, and will not be directly discharged into the atmosphere.

[0052] Positioning base 61 is fixed to the side of gas cylinder 52 away from cabinet door 2 and serves as a reference for support and positioning. To secure gas cylinder 52, positioning block 62, which is rotatably connected to partition 11 via connecting plate 63, is rotated to bring it closer to gas cylinder 52. Simultaneously, bolt 67 is tightened, driving elastic plate 65 toward pressure plate 64. This compresses pressure plate 64, causing positioning block 62 to apply firm pressure to gas cylinder 52, firmly securing it in place. This prevents loosening of the connection due to shaking during refilling, which could affect the stability and safety of refilling.

[0053] When sulfur hexafluoride gas is injected into the inner housing 41, the control box controls the opening of the first control valve 53 and the second control valve 79. The sulfur hexafluoride gas in the gas cylinder 52 then enters the inner housing 41 through the first inlet pipe 51. The push rod motor 78 then activates, driving the piston block 77 away from the second connecting pipe 75. The second one-way valve 712 prevents air from flowing back into the second connecting pipe 75, and the air in the inner housing 41 is drawn into the gas cylinder 74 through the first connecting pipe 73 and the first outlet pipe 71. The push rod motor 78 then drives the piston block 77 toward the second connecting pipe 75, pushing the gas in the gas cylinder 74 to move. The first one-way valve 711 prevents air from entering the first connecting pipe 73, allowing the air to pass through the second connecting pipe 75 and enter the waste gas cylinder 76 for storage. As the sulfur hexafluoride gas enters the inner box 41, it is dispersed by the baffle 9. Since the sulfur hexafluoride gas has a greater mass than air, it slowly fills the space within the inner box 41. The sulfur hexafluoride gas concentration is monitored by a gas detector within the inner box 41. The first control valve 53 and the second control valve 79 are then closed, and the sulfur hexafluoride gas remains within the inner box 41, providing insulation protection for the electrical equipment within.

[0054] When the insulation box 4 needs to be maintained, or the gas detector installed on the outer box 42 detects sulfur hexafluoride gas, and the gas detector installed on the inner box 41 monitors that the sulfur hexafluoride gas concentration has become low, and detects that the rubber pad 47 of the inner box 41 has failed, causing gas to leak between the inner box 41 and the outer box 42. First, the control box sends a signal to remind the staff to replace it before opening the cabinet door 2. First, the second control valve 79 and the fourth control valve 85 are controlled to open, and the push rod motor 78 is started to drive the piston block 77 to reciprocate, so that the sulfur hexafluoride gas in the inner box 41 is extracted, and at the same time, fresh air enters the inner box 41 through the second air inlet pipe 81. At the same time, the setting of the baffle 9 prevents fresh air from directly impacting the inner box 41, making it difficult for sulfur hexafluoride gas to be discharged. When the gas detector installed on the inner box 41 monitors that the sulfur hexafluoride concentration has dropped to an extremely low state, the push rod motor 78 is stopped. Then, the second control valve 79 and the fourth control valve 85 are closed, and the third control valve 710 and the fifth control valve 86 are opened. The push rod motor 78 is started to drive the piston block 77 to reciprocate, so that the gas containing sulfur hexafluoride between the inner box body 41 and the outer box body 42 is extracted. At the same time, one end of the third air inlet pipe 82 is connected to the second air outlet pipe 72 and the outer box body 42 at one end and is diagonally distributed, so that air can replace the gas between the inner box body 41 and the outer box body 42 with higher efficiency, until the gas detector installed on the outer box body 42 detects that the concentration of sulfur hexafluoride has dropped to an extremely low state, and then the push rod motor 78 is stopped.

[0055] The above specific embodiment is merely an optional embodiment of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above embodiment, those skilled in the art can make various alternative improvements and combinations to the above specific embodiment.

Claims

1. Environmentally friendly gas insulated ring main unit, characterized by: include: A cabinet (1) with an opening on one side, wherein two sets of partitions (11) are fixedly connected to the cabinet (1); Cabinet doors (2) hinged to both sides of the cabinet body (1); An insulation box (4) installed in the cabinet (1), wherein a load switch is installed in the insulation box (4); a supplementary mechanism (5) disposed below the insulating box (4), the supplementary mechanism (5) being used to discharge the insulating medium into the insulating box (4), and a positioning assembly (6) being installed on a side of the supplementary mechanism (5); an extraction mechanism (7) installed on the top of the insulation box (4), the extraction mechanism (7) being used to suck out the gas in the insulation box (4) and compress and store it; A connecting component (8) is arranged below the insulating box (4), and the connecting component (8) is used to replenish fresh air into the insulating box (4).

2. The environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that: The cabinet door (2) comprises a first door panel (21) hinged to one side of the cabinet body (1); a group of second door panels (22) and two groups of third door panels (23) are hinged to the other side of the cabinet body (1); both sides of the second door panel (22) are provided with pressing grooves (24); a pressing block (25) corresponding to the pressing groove (24) is installed on the side of the third door panel (23) close to the second door panel (22); a plurality of lock blocks (3) are fixedly connected between the two groups of partitions (11); and lock bodies (31) corresponding to the lock blocks (3) are installed on the first door panel (21), the second door panel (22) and the third door panel (23).

3. The environmentally friendly gas-insulated ring main unit according to claim 2, characterized in that: The insulating box (4) comprises an inner box (41) arranged on a side of a group of partitions (11) away from another group of partitions (11); an outer box (42) is arranged outside the inner box (41); the outer box (42) is fixedly connected to the group of partitions (11) and the cabinet (1); a plurality of groups of first fixing columns (43) are fixedly connected between the inner box (41) and the outer box (42); a load switch is installed in the inner box (41), and a load switch connection line passes through the inner box (41) and the outer box (42) and is connected by a rubber The inner box (41) and the outer box (42) are both provided with openings in the same direction as the cabinet (1); a first cover plate (44) is provided on one side of the opening of the inner box (41); a second cover plate (45) is provided on one side of the opening of the outer box (42); the second cover plate (45) is fixedly connected to the second door panel (22); a plurality of groups of second fixing columns (46) are fixedly connected between the first cover plate (44) and the second cover plate (45); and a rubber pad (47) is installed on one side of the opening of the inner box (41) and the outer box (42).

4. The environmentally friendly gas-insulated ring main unit according to claim 3, characterized in that: The replenishing mechanism (5) comprises a first air inlet pipe (51) installed at the bottom of the inner box (41) and in communication therewith, the first air inlet pipe (51) passing through the outer box (42) and connected to a gas storage bottle (52), a first stop valve (521) being installed at the air inlet end of the gas storage bottle (52), a first air pressure gauge (522) being further provided on the gas storage bottle (52), and a first control valve (53) being installed on the first air inlet pipe (51).

5. The environmentally friendly gas-insulated ring main unit according to claim 4, characterized in that: The positioning assembly (6) is used to fix the position of the gas cylinder (52). The positioning assembly (6) includes a positioning seat (61) provided on the side of the gas cylinder (52) away from the cabinet door (2). A positioning block (62) is provided on the side of the gas cylinder (52) away from the positioning seat (61). The positioning block (62) is fixedly connected to a connecting plate (63) on the side close to the partition (11). The connecting plate (63) is rotatably connected to the side of the partition (11). The positioning block (62) is away from the connecting plate ( 63) is fixedly connected to a pressure plate (64) at one end, and an elastic plate (65) is provided on the side of the pressure plate (64) away from the gas cylinder (52), and one end of the elastic plate (65) is rotatably connected to a first fixing seat (66), and a bolt (67) is installed at the other end of the elastic plate (65), and the bolt (67) passes through the elastic plate (65) and is threadedly connected to a second fixing seat (68), and the first fixing seat (66) and the second fixing seat (68) are both fixedly connected to the inner wall of the cabinet (1).

6. The environmentally friendly gas-insulated ring main unit according to claim 5, characterized in that: The extraction mechanism (7) comprises a first air outlet pipe (71) installed on the top of the inner box (41) and in communication therewith, and the extraction mechanism (7) further comprises a second air outlet pipe (72) installed on the top of the outer box (42) and in communication therewith, the first air outlet pipe (71) and the second air outlet pipe (72) are connected to a first connecting pipe (73) via a three-way joint, one end of the first connecting pipe (73) is connected to an air cylinder (74), and the end of the air cylinder (74) away from the partition (11) is fixedly connected to a second A connecting pipe (75) is provided, the other end of the second connecting pipe (75) is connected to a waste gas bottle (76), a second stop valve (761) is installed at the air inlet end of the waste gas bottle (76), and a second air pressure gauge (762) is also provided on the waste gas bottle (76). A push rod motor (78) is installed in the two groups of the partitions (11), and the output end of the push rod motor (78) passes through one side of the gas cylinder (74) and is fixedly connected to a piston block (77), and the piston block (77) is slidably connected to the gas cylinder (74).

7. The environmentally friendly gas-insulated ring main unit according to claim 6, characterized in that: A second control valve (79) is installed on the first air outlet pipe (71), a third control valve (710) is installed on the second air outlet pipe (72), a first one-way valve (711) is installed on the first connecting pipe (73), and a second one-way valve (712) is installed on the second connecting pipe (75).

8. The environmentally friendly gas-insulated ring main unit according to claim 7, characterized in that: The connecting assembly (8) includes a second air inlet pipe (81) installed at the bottom of the inner box (41) and connected thereto, and the connecting assembly (8) also includes a third air inlet pipe (82) penetrating the bottom of the outer box (42), one end of the third air inlet pipe (82) is located between the inner box (41) and the outer box (42), and is diagonally connected to the second air outlet pipe (72) and the outer box (42). A partition frame (83) is fixedly connected to the inner wall of the cabinet (1), and the partition frame (83) is fixedly connected to the inner wall of the cabinet (1). 3) one side is fixedly connected to the cabinet (1), the other end of the third air inlet pipe (82) and one end of the second air inlet pipe (81) both pass through a side wall of the partition frame (83), the cabinet (1) and the third door panel (23) and the partition frame (83) are all provided with shutters (84) at corresponding positions, and filter cotton is installed at the position of the shutters (84), the second air inlet pipe (81) is installed with a fourth control valve (85), and the third air inlet pipe (82) is installed with a fifth control valve (86).

9. The environmentally friendly gas-insulated ring main unit according to claim 8, characterized in that: A baffle (9) is provided above the first air intake pipe (51) and the second air intake pipe (81). The diameter of the baffle (9) is larger than the diameter of the first air intake pipe (51) and the second air intake pipe (81). Multiple groups of connecting columns (91) are fixedly connected between the baffle (9) and the inner box (41).

10. The environmentally friendly gas-insulated ring main unit according to claim 8, characterized in that: A control box is also installed on the inner wall of the cabinet (1), and multiple gas detectors are installed on the inner box (41) and the outer box (42). Flow meters are also provided at both ends of the multiple control valves. The multiple control valves, the push rod motor (78), the flow meter and the gas detector are all electrically connected to the control box.

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