An environmentally friendly gas-insulated ring main unit

Abstract

The present invention discloses an environmentally friendly gas-insulated ring main unit, belonging to the technical field of electrical cabinets. The ring main unit includes an electrical switch installed on the cabinet body. The electrical switch includes a first installation groove and a second installation groove provided at the opening end of the box body. A manipulation mechanism is installed in the first installation groove, and a load switch mechanism is installed in the second installation groove. The manipulation mechanism is used to drive the load switch mechanism to close or open; inside the box body, a C-shaped gas filling chamber is provided on the outer periphery of the first installation groove for insulating and extinguishing the arc generated when the load switch mechanism is closed; the manipulation end of the manipulation mechanism passes through the box door from the manipulation port and is rotated and then clamped in the manipulation port, thereby driving the load switch mechanism to close and pulling the box door reversely against the opening end of the box body, improving the sealing effect of the opening end of the box body and preventing harmful gases in the ring main unit from overflowing from the connection seam, causing environmental pollution.

Description

Technical Field

[0001] The present invention relates to an environmentally friendly gas-insulated ring main unit, belonging to the technical field of electrical cabinets. Background Art

[0002] A ring main unit is a set of power transmission and distribution electrical equipment (high-voltage switchgear) installed in a metal or non-metal insulated cabinet or made into a prefabricated sectionalized ring main power supply unit. Its core part uses a load switch and a fuse, and has the advantages of simple structure, small volume, low price, improved power supply parameters and performance, and power supply safety. During the use of a gas ring main unit, mainly two methods of SF6 gas insulation arc extinguishing and solid insulation vacuum arc extinguishing are adopted.

[0003] Among them, during the use of SF6 gas insulation, harmful gases are easily generated when insulating and extinguishing the arc generated by an electrical switch. At present, the cabinet door of the ring main unit is mainly connected by hinges and lacks a sealing structure, and the harmful gases in the ring main unit are easily spilled from the connection seams, thus causing environmental pollution. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an environmentally friendly gas-insulated ring main unit to solve the technical problems mentioned in the prior art.

[0005] An environmentally friendly gas-insulated ring main unit, the ring main unit includes a cabinet body and an electrical switch installed on the cabinet body. The electrical switch includes a box body with an opening on one side and a box door hingedly installed on the opening side of the box body. An elastic sealing strip is arranged on the box door close to the opening side of the box body. The opening end of the box body is sequentially provided with a first installation groove and a second installation groove from top to bottom. A manipulation mechanism is installed in the first installation groove, and a load switch mechanism is installed in the second installation groove. The driving end of the manipulation mechanism penetrates the bottom end of the first installation groove and extends into the second installation groove to be connected with the load switch mechanism. The manipulation mechanism is used to drive the load switch mechanism to close or open;

[0006] Inside the box body, a C-shaped gas filling chamber is arranged on the outer periphery of the first installation groove. The opening direction of the C-shaped gas filling chamber is the same as the opening direction of the box body. An air outlet is arranged at the bottom of the C-shaped gas filling chamber, and a valve control component is installed on the air outlet. The valve control component is used to control the insulating gas filled in the C-shaped gas filling chamber to flow from the air outlet into the second installation groove to insulate and extinguish the generated arc when the load switch mechanism is closed;

[0007] An operation port is provided on the cabinet door, and the operation end of the operation mechanism passes through the operation port into the cabinet door and is rotationally engaged in the operation port after rotation, so as to drive the load switch mechanism to close and reversely tension the cabinet door against the opening end of the cabinet body, realizing the sealing of the opening end of the cabinet body.

[0008] Optionally, the operation port includes a plug-in part and a clamping part. The plug-in part is arranged on the side of the cabinet door close to the cabinet body, and the clamping part is arranged on the side of the cabinet door away from the cabinet body;

[0009] The central structure of the plug-in part is in the shape of a circular hole, and two strip-shaped through grooves are symmetrically arranged on both sides of the circular hole;

[0010] The structure of the clamping part is a circular through groove, and the circular through groove is coaxially arranged with the plug-in part. An arc-shaped protrusion is arranged on the clamping part and extends outward in a rotating manner from one side of one of the strip-shaped through grooves to the side close to the other strip-shaped through groove, for the operation end of the operation mechanism to pass through the plug-in part and then rotate and engage in the clamping part along the arc-shaped protrusion.

[0011] Optionally, the operation mechanism includes:

[0012] A bidirectional lead screw, one end of the bidirectional lead screw is rotatably installed on the first installation groove, and a knob is arranged at the other end of the bidirectional lead screw. The structure and size of the knob are adapted to the plug-in part, and the knob is used to pass through the plug-in part and then rotate and engage in the clamping part along the arc-shaped protrusion to realize the reverse tension of the cabinet door;

[0013] Two threaded seats are respectively installed on the reverse screw pairs of the bidirectional lead screw;

[0014] A compression spring is sleeved on the bidirectional lead screw, and both ends of the compression spring are respectively connected to the opposite surfaces of the two threaded seats;

[0015] An isolating knife switch is arranged below the bidirectional lead screw. Both sides of the top of the isolating knife switch are respectively hinged to the two threaded seats through cranks, and the tops of the two groups of cranks are inclined towards the mutually separated sides. The bottom of the isolating knife switch penetrates through the bottom of the first installation groove and extends into the second installation groove to be connected to the load switch mechanism.

[0016] Optionally, the load switch mechanism includes:

[0017] An insulating board is arranged in the second installation groove, and the top of the insulating board is connected to the bottom of the isolating knife switch;

[0018] The moving contact is integrally formed on the insulating plate. A connecting portion is provided above the insulating plate by extending the top of the moving contact, and an attracting portion is provided below the insulating plate by extending the bottom of the moving contact.

[0019] The static contact is installed at the bottom of the second installation groove. The top of the static contact and the attracting portion are in a state of mutual attraction or mutual separation. The bottom of the static contact penetrates the bottom of the box body and extends into the cabinet to supply power to several electrical components.

[0020] Optionally, the bottom of the C-shaped gas filling chamber extends into the second installation groove. After the moving contact and the attracting portion are mutually attracted, the periphery of the insulating plate slides to the bottom of the outer periphery of the C-shaped gas filling chamber.

[0021] Optionally, the valve control assembly includes:

[0022] A rotating shaft is embedded and installed at the bottom of the C-shaped gas filling chamber. Rotating wheels are respectively installed at both ends of the rotating shaft. A valve flap is installed on the inner side of the outer periphery of the rotating wheel in the C-shaped gas filling chamber, and a valve plate is installed on the outer side of the outer periphery of the rotating wheel in the C-shaped gas filling chamber. The valve flap blocks above the air outlet, and the valve plate is arranged below the insulating plate and is used to push the valve plate to rotate downward when the insulating plate moves downward, so as to drive the rotating wheel to drive the valve flap to rotate upward to open the air outlet.

[0023] A torsion spring is installed on the rotating shaft and is used to drive the valve plate to reset to block the air outlet after the valve plate loses the downward thrust of the insulating plate.

[0024] Optionally, an arc extinguishing plate is arranged below the air outlet at the bottom of the second installation groove. The arc extinguishing plate is formed by ceramic hollowing to form a honeycomb structure.

[0025] Optionally, at least two layers of arc extinguishing plates are provided, and the two layers of arc extinguishing plates are arranged in a circular structure on the periphery of the static contact.

[0026] Optionally, an air injection port, an exhaust port and a pressure gauge are respectively installed at one end of the C-shaped gas filling chamber located at the opening end of the box body. Through holes for accommodating the air injection port, the exhaust port and the pressure gauge are provided on the box door.

[0027] Optionally, heat dissipation fins are arranged on the top of the C-shaped gas filling chamber. The inside of the heat dissipation fins is a hollow structure, and the inside of the heat dissipation fins is communicated with the C-shaped gas filling chamber.

[0028] The beneficial effects that the present invention can produce include:

[0029] An environmentally friendly gas-insulated ring main unit provided by the present invention optimizes the structure of the ring main unit. When transmitting and distributing electricity to the ring main unit, only the operating end of the operating mechanism needs to be inserted into the cabinet door through the operating port and rotated and then clamped in the operating port, so as to drive the load switch mechanism to close and conduct power transmission for the electrical components in the cabinet body. At the same time, the cabinet door is pulled back tightly at the open end of the cabinet body, so that the gasket arranged between the cabinet body and the cabinet door is pressed tightly, thereby improving the sealing effect of the open end of the cabinet body and preventing harmful gases in the ring main unit from overflowing from the connection seam, causing environmental pollution. And the first installation groove and the second installation groove are separated into two independent chambers, which can avoid the insulating gas in the C-shaped gas filling chamber flowing out to the outside of the ring main unit along the operating port on one side of the first installation groove after the load switch mechanism is closed, causing leakage. And when the load switch mechanism is closed, the valve control component is opened at the same time, so that the insulating gas filled in the C-shaped gas filling chamber flows into the second installation groove from the air outlet to timely insulate and extinguish the generated arc. Description of the Drawings

[0030] Figure 1 Is a perspective view of an environmentally friendly gas-insulated ring main unit of the present invention;

[0031] Figure 2 In the present invention Figure 1 The front view of the electrical switch removing the cabinet door;

[0032] Figure 3 In the present invention Figure 1 The sectional view taken along line A-A of the present invention;

[0033] Figure 4 In the present invention Figure 1 The sectional view taken along line B-B of the present invention;

[0034] Figure 5 In the present invention Figure 1 The enlarged view at C of the present invention;

[0035] Figure 6 In the present invention Figure 4 The structural schematic diagram of the valve control component of the present invention;

[0036] In the figure: 1, cabinet body; 2, electrical switch; 3, box body; 4, box door; 5, first installation groove; 6, second installation groove; 7, C-shaped gas filling chamber; 8, air outlet; 9, operation port; 10, insertion part; 11, engaging part; 12, arc-shaped protrusion; 13, bidirectional lead screw; 14, knob; 15, threaded seat; 16, compression spring; 17, isolating knife switch; 18, crank; 19, insulating plate; 20, moving contact; 21, static contact; 22, connecting part; 23, attracting part; 24, rotating shaft; 25, rotating wheel; 26, valve flap; 27, valve plate; 28, torsion spring; 29, arc extinguishing plate; 30, gas injection port; 31, exhaust port; 32, pressure gauge; 33, heat dissipation fin. Detailed implementation manners

[0037] The present invention will be described in detail below in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0038] As Figures 1 - 6 shown, the present invention provides an environmentally friendly gas-insulated ring main unit. The ring main unit includes a cabinet body 1 and an electrical switch 2 installed on the cabinet body 1. The electrical switch 2 includes a box body 3 with an opening on one side and a box door 4 hingedly installed on the opening side of the box body 3. An elastic sealing strip is arranged on the box door 4 close to the opening side of the box body 3. The opening end of the box body 3 is successively provided with a first installation groove 5 and a second installation groove 6 from top to bottom. A manipulation mechanism is installed in the first installation groove 5, and a load switch mechanism is installed in the second installation groove 6. The driving end of the manipulation mechanism penetrates through the bottom end of the first installation groove 5 and extends into the second installation groove 6 to be connected with the load switch mechanism. The manipulation mechanism is used to drive the load switch mechanism to close or disconnect;

[0039] Inside the box body 3, a C-shaped gas filling chamber 7 is arranged on the outer periphery of the first installation groove 5. The opening direction of the C-shaped gas filling chamber 7 is the same as the opening direction of the box body 3. An air outlet 8 is opened at the bottom of the C-shaped gas filling chamber 7, and a valve control component is installed on the air outlet 8. The valve control component is used to control the insulating gas filled in the C-shaped gas filling chamber 7 to flow from the air outlet 8 into the second installation groove 6 to insulate and extinguish the generated arc when the load switch mechanism is closed;

[0040] An operation port 9 is opened on the box door 4. The operation end of the manipulation mechanism penetrates through the box door 4 from the operation port 9 and is rotationally engaged in the operation port 9, so as to drive the load switch mechanism to close and pull the box door 4 reversely against the opening end of the box body 3, realizing the sealing of the opening end of the box body 3.

[0041] In the above, by optimizing the structure of the ring main unit, when transmitting and distributing electricity to the ring main unit, it is only necessary to insert the operating end of the operating mechanism through the operating port 9 into the cabinet door 4 and rotate it to be clamped in the operating port 9, then the load switch mechanism can be driven to close to supply power to the electrical components in the cabinet body 1; at the same time, the cabinet door 4 is pulled tightly in the opposite direction at the open end of the cabinet body 3, so that the gasket provided between the cabinet body 3 and the cabinet door 4 is pressed tightly, thereby improving the sealing effect of the open end of the cabinet body 3 and preventing harmful gases in the ring main unit from overflowing from the connection seam, causing environmental pollution; and the first installation groove 5 and the second installation groove 6 are separated into two independent chambers, which can avoid the insulating gas in the C-shaped gas filling chamber 7 flowing out to the outside of the ring main unit along the operating port 9 on one side of the first installation groove 5 after the load switch mechanism is closed, resulting in leakage, and at the same time, the valve control component is opened when the load switch mechanism is closed, so that the insulating gas filled in the C-shaped gas filling chamber 7 flows into the second installation groove 6 from the air outlet 8 to extinguish the generated arc in time by insulation.

[0042] In the above, the insulating gas filled in the C-shaped gas filling chamber 7 can adopt SF6 gas.

[0043] In the above, currently, a sealing strip is usually arranged on one side of the cabinet door 4 of the electrical switch 2, so that after the cabinet door 4 and the cabinet body 3 are closed, the sealing strip is pressed tightly on the cabinet body 3. The existing electrical switch 2 has a hinged structure on one side of the door body and a lock structure on the other side. When the cabinet door 4 is locked on the cabinet body 3 through the lock structure, the hinged end side usually warps due to uneven force, resulting in the sealing strip losing its sealing effect, so that harmful gases in the cabinet body 3 are easily spilled from the hinged end side; in this embodiment, in order to solve the drawbacks existing in the prior art, the sealing strip is preferably an elastic sealing strip, so that after the cabinet door 4 is pulled tightly in the opposite direction, the whole sealing strip is pressed on the open end of the cabinet body 3 by the cabinet door 4 in the transverse direction, and through the elastic deformation of the sealing strip, the sealing strip fits more tightly between the cabinet body 3 and the cabinet door 4, further improving the sealing effect.

[0044] Further, the operating port 9 includes a plug-in part 10 and a clamping part 11. The plug-in part 10 is arranged on the side of the cabinet door 4 close to the cabinet body 3, and the clamping part 11 is arranged on the side of the cabinet door 4 far from the cabinet body 3; among them, the central structure of the plug-in part 10 is in the shape of a round hole, and two strip-shaped through grooves are symmetrically opened on both sides of the round hole; the structure of the clamping part 11 is a circular through groove, the circular through groove is coaxially arranged with the plug-in part 10, and an arc-shaped protrusion 12 is arranged on the clamping part 11 and extends outward in a rotating manner from one side of one strip-shaped through groove to the side close to the other strip-shaped through groove, for the operating end of the operating mechanism to pass through the plug-in part 10 and then rotate and be clamped in the clamping part 11 along the arc-shaped protrusion 12.

[0045] Further, the operating mechanism includes:

[0046] Bidirectional lead screw 13, one end of the bidirectional lead screw 13 is rotatably installed on the first installation groove 5 through a bearing, and a knob 14 is fixedly installed at the other end of the bidirectional lead screw 13. The knob 14 is made of a non-metallic insulating material, and the structure and size of the knob 14 are adapted to the insertion part 10, and is used to pass the knob 14 through the insertion part 10 and then rotate and engage it in the engaging part 11 along the arc-shaped protrusion 12 to realize the reverse tensioning of the box door 4;

[0047] Two threaded seats 15, the two threaded seats 15 are respectively threadedly installed on the reverse screw pairs of the bidirectional lead screw 13;

[0048] Compression spring 16, the compression spring 16 is sleeved on the bidirectional lead screw 13, and the two ends of the compression spring 16 are respectively fixedly connected to the opposite surfaces of the two threaded seats 15;

[0049] Isolating knife switch 17, the isolating knife switch 17 is arranged below the bidirectional lead screw 13. The two sides of the top of the isolating knife switch 17 are respectively hinged to the two threaded seats 15 through cranks 18, and the tops of the two groups of cranks 18 are inclined towards the mutually separated sides. The bottom of the isolating knife switch 17 penetrates the bottom of the first installation groove 5 and extends into the second installation groove 6 to be connected with the load switch mechanism.

[0050] In the above, in order to ensure that the first installation groove 5 and the second installation groove 6 are not connected to each other after the load switch mechanism is closed, a high-temperature resistant sealing ring is installed in the communication hole between the first installation groove 5 and the second installation groove 6, and the sealing ring is sleeved on the bottom of the isolating knife switch 17.

[0051] Further, the load switch mechanism includes:

[0052] Insulating plate 19, the insulating plate 19 is arranged in the second installation groove 6, and the top of the insulating plate 19 is fixedly connected to the bottom of the isolating knife switch 17;

[0053] Moving contact 20, the moving contact 20 is integrally formed on the insulating plate 19. The top of the moving contact 20 extends above the insulating plate 19 and is provided with a connecting part 22 for installing an external cable, and the bottom of the moving contact 20 extends below the insulating plate 19 and is provided with an attracting part 23;

[0054] Static contact 21, the static contact 21 is fixedly installed at the bottom of the second installation groove 6, the top of the static contact 21 and the attracting part 23 are in a mutually attracted or mutually separated state, and the bottom of the static contact 21 penetrates the bottom of the box body 3 and extends into the cabinet body 1 to supply power to a number of electrical components.

[0055] In the above, when it is necessary to drive the load switch mechanism to close, the knob 14 is passed through the insertion part 10 and then rotated along the arc-shaped protrusion 12 and snapped into the engaging part 11, so that the knob 14 drives the bidirectional lead screw 13 to rotate and drives the two threaded seats 15 to move towards each other, and then the isolating knife 17 is pressed downward through the crank 18, so that the isolating knife 17 drives the insulating plate 19 to move downward to suck the moving contact 20 and the static contact 21 together, thus completing the closing action of the load switch mechanism.

[0056] In the above, when it is necessary to drive the load switch mechanism to open, the knob 14 is rotated in the reverse direction until the knob 14 can slide out of the operating port 9 to the outside of the cabinet door 4, and the opening action of the load switch mechanism can be completed.

[0057] Furthermore, the bottom of the C-shaped gas filling chamber 7 extends into the second installation groove 6. After the moving contact 20 and the attracting part 23 are attracted to each other, the peripheral side of the insulating plate 19 slides to the bottom of the outer peripheral side of the C-shaped gas filling chamber 7, which can play a role in guiding and fixing the insulating plate 19.

[0058] Furthermore, the valve control assembly includes:

[0059] A rotating shaft 24, the rotating shaft 24 is embedded and installed at the bottom of the C-shaped gas filling chamber 7. Rotating wheels 25 are respectively fixedly installed at both ends of the rotating shaft 24. A valve flap 26 is integrally formed on the outer periphery of the rotating wheel 25 inside the C-shaped gas filling chamber 7, and a valve plate 27 is integrally formed on the outer periphery of the rotating wheel 25 outside the C-shaped gas filling chamber 7. The valve flap 26 blocks above the air outlet 8, and the valve plate 27 is arranged below the insulating plate 19, and is used to push the valve plate 27 to rotate downward when the insulating plate 19 moves downward, so as to drive the rotating wheel 25 to drive the valve flap 26 to rotate upward to open the air outlet 8;

[0060] A torsion spring 28, the torsion spring 28 is installed on the rotating shaft 24, and is used to drive the valve plate 27 to reset to block the air outlet 8 after the valve plate 27 loses the downward thrust of the insulating plate 19.

[0061] Furthermore, an arc extinguishing plate 29 is fixedly installed at the bottom of the second installation groove 6 below the air outlet 8. The arc extinguishing plate 29 is formed by ceramic hollowing to form a honeycomb structure, so that the insulating gas is filled into the arc extinguishing plate 29 to form a gas insulation isolation belt for arc insulation and extinguishing.

[0062] Furthermore, at least two layers of arc extinguishing plates 29 are provided, and the two layers of arc extinguishing plates 29 are arranged in a circular structure around the static contact 21, so that a multi-layer gas insulation isolation belt is formed around the static contact 21 to improve the arc extinguishing effect.

[0063] Furthermore, an air injection port 30, an exhaust port 31, and a pressure gauge 32 are respectively installed at one end of the C-shaped gas filling chamber 7 located at the open end of the box body 3. Through holes for accommodating the air injection port 30, the exhaust port 31, and the pressure gauge 32 are provided on the box door 4.

[0064] In the above, the air injection port 30 is used to fill the C-shaped gas filling chamber 7 with insulating gas. The exhaust port 31 is used to discharge the harmful gases generated after arc extinguishing treatment in the C-shaped gas filling chamber 7, and to relieve pressure when the air pressure in the C-shaped gas filling chamber 7 is too high. The pressure gauge 32 is used to detect the pressure value in the C-shaped gas filling chamber 7.

[0065] It should be noted that: when the load switch mechanism is disconnected, the valve control component blocks the air outlet 8, resulting in the ineffective collection of harmful gases in the second installation groove 6, causing some harmful gases to leak when the box door 4 is opened. Therefore, an exhaust port 31 can be added on one side of the bottom of the second installation groove 6 to effectively collect the harmful gases generated in the second installation groove 6.

[0066] In the above, check valves are respectively installed at the exhaust port 31 and the air injection port 30. The flow direction of the check valve at the exhaust port 31 is from the inside of the box body 3 to the outside of the box body 3, so that negative pressure is formed by the suction component outside the box body 3 to lead the harmful gases inside the box body 3 out of the box body 3. Among them, the suction component can be composed of suction equipment such as a suction fan and a connecting pipe; the flow direction of the check valve at the air injection port 30 is from the outside of the box body 3 to the inside of the box body 3, and insulating gas can be introduced into the C-shaped gas filling chamber 7 through a high-pressure gas storage tank.

[0067] Furthermore, a plurality of heat dissipation fins 33 are installed on the top of the C-shaped gas filling chamber 7. The inside of the heat dissipation fins 33 is a hollow structure, and the inside of the heat dissipation fins 33 is communicated with the C-shaped gas filling chamber 7 to accelerate the heat dissipation effect of the electrical switch 2 inside. Among them, since the gas flow direction is from bottom to top, and the heat transfer direction of temperature is from the heat medium to the cold medium, therefore, in this embodiment, the high-temperature gas generated after the insulating gas in the second installation groove 6 undergoes insulating arc extinguishing will flow to one side of the heat dissipation fins 33 through the air outlet 8, and the heat dissipation fins 33 are designed to protrude outward on the top of the box body 3, which can increase the heat exchange rate between the external cold air flow and the heat dissipation fins 33, thereby improving the heat dissipation effect.

[0068] The above are only several embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the relevant art can make some changes or modifications within the scope of the technical solution of the present invention by using the disclosed technical content, which is equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. An environmentally friendly gas-insulated ring main unit, the ring main unit comprising a cabinet body (1) and an electrical switch (2) installed on the cabinet body (1), the electrical switch (2) comprising a box body (3) with an opening on one side and a box door (4) hingedly installed on the opening side of the box body (3), characterized in that, An elastic sealing strip is provided on the opening side of the box door (4) close to the box body (3). The opening end of the box body (3) is successively provided with a first installation groove (5) and a second installation groove (6) from top to bottom. A control mechanism is installed in the first installation groove (5), and a load switch mechanism is installed in the second installation groove (6). The driving end of the control mechanism penetrates through the bottom end of the first installation groove (5) and extends into the second installation groove (6) to be connected with the load switch mechanism. The control mechanism is used to drive the load switch mechanism to close or open; Inside the box body (3) and outside the circumference of the first installation groove (5), a C-shaped gas filling chamber (7) is provided. The opening direction of the C-shaped gas filling chamber (7) is the same as the opening direction of the box body (3). An air outlet (8) is provided at the bottom of the C-shaped gas filling chamber (7). A valve control component is installed on the air outlet (8). The valve control component is used to control the insulating gas filled in the C-shaped gas filling chamber to flow from the air outlet (8) into the second installation groove (6) to insulate and extinguish the generated electric arc when the load switch mechanism is closed; A control port (9) is provided on the box door (4). The control end of the control mechanism passes through the control port (9) into the box door (4) and is rotationally engaged in the control port (9) after rotation, so as to drive the load switch mechanism to close and pull the box door (4) reversely against the opening end of the box body (3) to realize the sealing of the opening end of the box body (3).

2. The environmentally friendly gas-insulated ring main unit according to claim 1, wherein The control port (9) includes a plug-in part (10) and a clamping part (11). The plug-in part (10) is provided on the side of the box door (4) close to the box body (3), and the clamping part (11) is provided on the side of the box door (4) far from the box body (3); The central structure of the plug-in part (10) is in the shape of a round hole, and two strip-shaped through grooves are symmetrically arranged on both sides of the round hole; The structure of the clamping part (11) is a circular through groove. The circular through groove is coaxially arranged with the plug-in part (10). An arc-shaped protrusion (12) is rotatably extended outward from one side of one of the strip-shaped through grooves to the side close to the other strip-shaped through groove on the clamping part (11) for the control end of the control mechanism to pass through the plug-in part (10) and then be rotationally engaged in the clamping part (11) along the arc-shaped protrusion (12).

3. The environmentally friendly gas-insulated ring main unit according to claim 2, wherein The control mechanism includes: A bidirectional lead screw (13), one end of the bidirectional lead screw (13) is rotatably installed on the first installation groove (5), and the other end of the bidirectional lead screw (13) is provided with a knob (14). The structure and size of the knob (14) are adapted to the plug-in part (10) for passing the knob (14) through the plug-in part (10) and then rotationally engaging it in the clamping part (11) along the arc-shaped protrusion (12) to realize the reverse tension of the box door (4); Two threaded seats (15), and the two threaded seats (15) are respectively installed on the reverse screw pairs of the bidirectional lead screw (13); A compression spring (16) is sleeved on the bidirectional lead screw (13), and two opposite faces of the two threaded seats (15) are respectively connected to two ends of the compression spring (16). An isolating knife switch (17) is arranged below the bidirectional lead screw (13). Two sides of the top of the isolating knife switch (17) are respectively hinged to the two threaded seats (15) through cranks (18), and tops of the two groups of cranks (18) are inclined towards the mutually away sides. The bottom of the isolating knife switch (17) penetrates through the bottom of the first installation groove (5) and extends into the second installation groove (6) to be connected with the load switch mechanism.

4. The environmentally friendly gas-insulated ring main unit according to claim 3, characterized in that, The load switch mechanism includes: An insulating board (19) is arranged in the second installation groove (6), and the top of the insulating board (19) is connected to the bottom of the isolating knife switch (17). A moving contact (20) is integrally formed on the insulating board (19). A connecting portion (22) is arranged above the insulating board (19) at the top of the moving contact (20), and an attracting portion (23) is arranged below the insulating board (19) at the bottom of the moving contact (20). A static contact (21) is installed at the bottom of the second installation groove (6). The top of the static contact (21) and the attracting portion (23) are in a mutually attracting or mutually separating state. The bottom of the static contact (21) penetrates through the bottom of the box body (3) and extends into the cabinet body (1) to conduct power transmission to several electrical components.

5. The environmentally friendly gas-insulated ring main unit according to claim 4, characterized in that The bottom of the C-shaped gas filling chamber (7) extends into the second installation groove (6). After the moving contact (20) and the attracting portion (23) are mutually attracted, the periphery of the insulating board (19) slides to the outer peripheral bottom of the C-shaped gas filling chamber (7).

6. The environmentally friendly gas-insulated ring main unit according to claim 5, characterized in that, The valve control assembly includes: A rotating shaft (24) is embedded and installed at the bottom of the C-shaped gas filling chamber (7). Rotating wheels (25) are respectively installed at two ends of the rotating shaft (24). A valve flap (26) is installed on the inner side of the C-shaped gas filling chamber (7) at the outer periphery of the rotating wheel (25), and a valve plate (27) is installed on the outer side of the C-shaped gas filling chamber (7) at the outer periphery of the rotating wheel (25). The valve flap (26) blocks above the air outlet (8), and the valve plate (27) is arranged below the insulating board (19) and is used for pushing the valve plate (27) to rotate downward when the insulating board (19) moves downward, so as to drive the rotating wheel (25) to drive the valve flap (26) to rotate upward to open the air outlet (8). A torsion spring (28) is installed on the rotating shaft (24) and is used for driving the valve plate (27) to reset to block the air outlet (8) after the valve plate (27) loses the downward thrust of the insulating board (19).

7. The environmentally friendly gas-insulated ring main unit according to claim 4, characterized in that, A arc extinguishing plate (29) is arranged below the bottom of the second installation groove (6) and located below the air outlet (8), and the arc extinguishing plate (29) is formed into a honeycomb structure by ceramic hollowing.

8. An environmentally friendly gas-insulated ring main unit according to claim 7, characterized in that, At least two layers of the arc extinguishing plates (29) are provided, and the two layers of arc extinguishing plates (29) are arranged in a circular structure on the periphery of the static contact (21).

9. The environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that, An air injection port (30), an exhaust port (31) and a pressure gauge (32) are respectively installed at one end of the C-shaped gas filling chamber (7) located at the opening end of the box body (3), and through holes for accommodating the air injection port (30), the exhaust port (31) and the pressure gauge (32) are provided on the box door (4).

10. The environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that, Radiating fins (33) are arranged on the top of the C-shaped gas filling chamber (7), the inside of the radiating fins (33) is a hollow structure, and the inside of the radiating fins (33) is communicated with the C-shaped gas filling chamber (7).

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