An environmentally friendly air-insulated AC metal-enclosed ring main unit (RMU)

Abstract

The present invention discloses an environment-friendly air-insulated AC metal-enclosed ring main switchgear, belonging to the technical field of switchgear. An environment-friendly air-insulated AC metal-enclosed ring main switchgear includes a cable chamber, and an air tank chamber is fixedly installed at the upper end of the cable chamber. Through the structure of the isolation plate and the separation plate, and the staggered air duct structure of the isolation plate and the separation plate, heat of hot air can be effectively dissipated through the air duct. Through the structure of the isolation frame, while effectively avoiding the generation of electric arcs, the sealed air tank chamber can be effectively cooled. At the same time, the circulating liquid can drive the spoiler to prevent the reverse flow of air, reduce the air backflow, and improve the overall heat dissipation efficiency. Through the structure of the contact sealing strip, the connection position can be sealed, the airtightness of the cable chamber can be increased, air leakage caused by the aging and deformation of the connection sealing strip can be avoided, the overall service life can be prolonged, and the maintenance cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of switch cabinets, and more particularly to an environmentally friendly air-insulated AC metal-enclosed ring network switch cabinet. Background Art

[0002] In the power system, closed ring network switchgear is an important electrical equipment, widely used in urban power grids, industrial enterprises and other places, and undertakes key tasks such as power distribution, control and protection. However, the current closed ring network switchgear faces many severe problems in heat dissipation and moisture resistance.

[0003] There are multiple spaces inside the closed ring network switch cabinet. Generally, the wiring position in the cable room will continue to generate heat during operation. Since the switch cabinet adopts a closed structure, the internal air circulation is not smooth, and the heat is difficult to dissipate effectively, resulting in a continuous increase in the temperature inside the cabinet. Excessive temperature will not only affect the normal performance and service life of electrical components, but may also cause electrical failures and even safety accidents. Traditional heat dissipation methods mostly rely on natural ventilation or simple vent design. The efficiency of natural ventilation is extremely low and cannot meet the heat dissipation requirements when the load is large. Although simple vents can increase air circulation to a certain extent, they are also prone to air reflux, causing hot air to flow back into the machine room. Since the interior of the air box room is a sealed space, the heat dissipation can generally only be assisted by the shell, and the heat dissipation efficiency is low. If the internal metal heat dissipation is increased, it is easy to cause an arc reaction inside, causing an accident. Summary of the invention

[0004] The object of the present invention is to provide an environmentally friendly air-insulated AC metal-enclosed ring network switch cabinet to solve the problems raised in the above-mentioned background technology.

[0005] An environmentally friendly air-insulated AC metal-enclosed ring network switch cabinet comprises a cable room, an air box room is fixedly installed on the upper end of the cable room, a mechanism box is fixedly installed on the front side of the air box room, an instrument box is fixedly installed on the upper end of the mechanism box, an isolation plate is fixedly installed on the bottom of the inner cavity of the cable room, a spoiler device is rotatably arranged on the upper side of the isolation plate, a separation plate is fixedly installed on the rear side of the inner cavity top of the cable room, an arc-shaped base is fixedly installed on the rear side of the inner cavity bottom of the cable room, and a cooling fan is fixedly installed on the upper side of the arc-shaped base on the rear side of the inner cavity of the cable room;

[0006] A pressure relief chamber is fixedly installed on the rear side of the cable chamber, a sealed water tank is fixedly installed on the rear side of the pressure relief chamber, an inner conduit is arranged inside the sealed water tank, a circulation pump is fixedly installed on the lower end of the sealed water tank, a circulation pipe is fixedly installed on one end of the circulation pump, the other end of the circulation pump is fixedly connected to the inner conduit, and a liquid return pipe is fixedly installed on the lower end of the inner conduit;

[0007] A sealed partition is provided between the cable chamber and the gas tank chamber. A current transformer is fixedly installed in the middle of the gas tank chamber. An isolation frame is fixedly installed at the top of the inner cavity of the gas tank chamber. A heat conducting plate is fixedly installed above the isolation frame. A metal liquid pipe is fixedly installed in a folded manner above the heat conducting plate. A seal is fixedly installed at one end of the isolation frame, and a liquid outlet pipe is fixedly installed at the other end of the isolation frame.

[0008] Connecting sealing strips are fixedly installed at the corner positions of the inner cavity of the gas tank chamber. An elastic groove is provided in the middle of the connecting sealing strips. Contact sealing strips are fixedly installed outside the connecting sealing strips at the corner positions of the inner cavity of the gas tank chamber. A pressure chamber is provided in the middle of the contact sealing strips.

[0009] Furthermore, a device base is fixedly installed at the lower end of the cable chamber. Four cable chambers are arranged side by side at equal intervals on the upper side of the device base. A cable door body is rotatably arranged at the front side of the cable chamber. Heat dissipation holes are provided on the front side of the cable door body.

[0010] By adopting the above technical solution, the heat dissipation holes provided in the middle of the front side of the cable door body can facilitate ventilation. The cable door body and the cable chamber are connected by hinges, which is convenient for installers to carry out maintenance and repair.

[0011] Furthermore, the flow disturbing device includes a flow disturbing plate rotatably arranged above the isolation plate. Driving fan blades are fixedly installed on the side edges of the flow disturbing plate. A circulation pipe is provided in the middle of the driving fan blades. Both the flow disturbing plate and the driving fan blades are made of PVC material components.

[0012] By adopting the above technical solution, a spiral fan blade is provided in the middle of the driving fan blade. The circulation pipe passes through the side edge of the driving fan blade. When the liquid inside the circulation pipe passes through the fan blades of the driving fan blade, the water pressure will drive the spiral fan blade inside the driving fan blade to rotate, thereby driving the flow disturbing plate to rotate synchronously. When the flow disturbing plate flips, the hot air above the cable chamber can be fluctuated to facilitate heat dissipation. Since the flow disturbing plate and the driving fan blades are made of non-conductive materials, the generation of induced electric arcs can be effectively avoided.

[0013] Furthermore, the upper side of the isolation plate is of an arc-shaped structure. The heat dissipation fan is obliquely arranged above the circulation pipe. An air outlet is provided above the rear side of the cable chamber.

[0014] By adopting the above technical solution, the heat dissipation fan blows air towards the upper rear side. When the heat dissipation fan blows upwards, a low-pressure area is formed at the front side of the separation plate. The hot air located above the isolation plate will move towards the bottom of the separation plate, and thus be blown out by the heat dissipation fan towards the rear side, and finally sent into the internal pressure relief chamber through the air outlet above the rear side of the cable chamber.

[0015] Furthermore, the inner conduit is bent and disposed inside the sealed water tank. A vacuum heat insulation groove is fixedly installed in the middle of the sealed water tank. Both the pressure relief chamber and the sealed water tank are made of aluminum material components.

[0016] By adopting the above technical solution, when the internal liquid flows through the inner conduit, the heated liquid will be conductively cooled by the sealed water tank, and the temperature of the sealed water tank will be directly transmitted to the pressure relief chamber, which can effectively expand the heat dissipation area and assist in heat dissipation.

[0017] Furthermore, the upper end of the liquid return pipe is fixedly connected to the liquid outlet pipe, the upper end of the circulation pipe is fixedly connected to the liquid inlet pipe, the liquid outlet pipe and the seal are respectively fixedly connected to both ends of the metal liquid pipe. The isolation frame is made of PVC material component, and the heat conduction plate and the metal liquid pipe are made of aluminum material components.

[0018] By adopting the above technical solution, the internal liquid pumps the liquid into the isolation plate through the circulation pump. The liquid passes through the circulation pipe and the liquid inlet pipe and enters the metal liquid pipe. When the current transformer generates heat, the hot air rises. At this time, the liquid inside the metal liquid pipe will absorb the heat, so that it can directly assist in heat dissipation inside the gas tank chamber. The isolation frame is made of insulating material, which can protect the heat conduction plate on the upper side of the isolation frame and can prevent the current transformer from generating an arc reaction with the heat conduction plate.

[0019] Furthermore, the middle part of the contact sealing strip is a triangular component. An arc-shaped groove is formed on the side of the connecting sealing strip. An arc-shaped protrusion corresponding to the connecting sealing strip is arranged on the side of the contact sealing strip. Auxiliary sealing air columns are fixedly installed on both sides of the contact sealing strip.

[0020] By adopting the above technical solution, when the inside of the gas tank chamber is filled with a mixed gas of dry air and nitrogen, as the pressure inside the gas tank chamber increases, the pressure chamber is under pressure and will squeeze the connecting sealing strip, causing the inside of the elastic groove to deform. At this time, the corner positions of the gas tank chamber will be further sealed. The auxiliary sealing air column can play an anti-slip and supporting role, reducing the deformation at the contact position between the contact sealing strip and the connecting sealing strip and increasing the friction force.

[0021] Furthermore, a rear cover plate is fixedly installed on the rear side of the gas tank chamber. A plurality of first pressure relief grooves are equidistantly formed on the rear side of the rear cover plate. A first pressure relief piece is fixedly installed at the position of the sealed partition on the rear side of the rear cover plate. A second pressure relief piece is fixedly installed below the rear side of the rear cover plate. An explosion-proof plate is fixedly installed on the rear side of the cable chamber. A plurality of second pressure relief grooves are formed in the middle of the explosion-proof plate. A third pressure relief piece is fixedly arranged in the middle of the rear side of the cable chamber.

[0022] By adopting the above technical solution, one end of the first pressure relief piece, the second pressure relief piece, and the third pressure relief piece is fixed by a metal bolt, and the other end is respectively connected to the rear cover plate and the explosion-proof plate by a sealed clamping structure. When the internal pressure of the gas chamber and the cable chamber reaches the limit range, the pressure will break through the first pressure relief piece, the second pressure relief piece, and the third pressure relief piece, and effectively relieve pressure from the position of the pressure relief chamber to protect the safety of the operators.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] 1. In the present invention, by providing the structure of the isolation plate and the separation plate, when hot air is generated inside the cable chamber, through the staggered air duct structure of the isolation plate and the separation plate, the hot air can be effectively dissipated through the air duct.

[0025] 2. In the present invention, by providing the structure of the isolation frame, compared with the traditional heat dissipation device, by arranging the heat conduction plate structure in the upward reverse direction, while effectively avoiding the generation of electric arcs, the sealed gas chamber can be effectively cooled. At the same time, the circulating liquid can drive the spoiler to prevent the reverse flow of air, reduce the backflow of air, and improve the overall heat dissipation efficiency.

[0026] 3. In the present invention, by providing the structure of the contact sealing strip, when the internal air pressure of the cable chamber increases, under the action of the pressure, the pressure chamber and the connecting sealing strip will further seal the connecting position, increase the airtightness of the cable chamber, prevent the connecting sealing strip from leaking air due to aging and deformation, extend the overall service life, and reduce the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a schematic diagram of the rear structure of the overall structure of the present invention;

[0029] Figure 3 is a schematic diagram of the structure at the explosion-proof plate position of the present invention;

[0030] Figure 4 is a sectional view of the overall structure of the present invention;

[0031] Figure 5 is a cross-sectional view of the overall structure of the present invention;

[0032] Figure 6 is of the present invention Figure 5 schematic diagram of the structure at position B;

[0033] Figure 7 is of the present invention Figure 5 schematic diagram of the structure at position A;

[0034] Figure 8It is the hot air flow diagram of the present invention;

[0035] Figure 9 It is the structural schematic diagram of the sealed water tank of the present invention;

[0036] Figure 10 It is the structural schematic diagram of the spoiler of the present invention.

[0037] Explanation of the reference numerals in the figure: 1. Air box chamber; 2. Pressure relief chamber; 3. Cable chamber; 4. Device base; 5. Cable door body; 6. Heat dissipation hole; 7. Instrument box; 8. Mechanism box; 9. Sealed water tank; 901. Inner conduit; 902. Vacuum heat insulation groove; 10. Circulation pump; 11. First pressure relief piece; 12. Rear cover plate; 1201. First pressure relief groove; 13. Second pressure relief piece; 14. Third pressure relief piece; 1401. Air outlet; 15. Explosion-proof plate; 1501. Second pressure relief groove; 16. Current transformer; 17. Separation plate; 18. Return liquid pipe; 19. Arc base; 20. Isolation plate; 2001. Spoiler; 2002. Driving fan blade; 21. Sealed partition; 22. Liquid inlet pipe; 23. Liquid outlet pipe; 24. Isolation frame; 25. Sealing member; 26. Heat dissipation fan; 27. Circulation pipe; 28. Elastic groove; 29. Connecting sealing strip; 30. Auxiliary sealed air column; 31. Pressure chamber; 32. Contact sealing strip; 33. Metal liquid pipe; 34. Heat conducting plate. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] As Figure 1 - Figure 10 shown, the embodiments of the present invention provide: including a cable chamber 3, an air box chamber 1 is fixedly installed at the upper end of the cable chamber 3, a mechanism box 8 is fixedly installed on the front side of the air box chamber 1, an instrument box 7 is fixedly installed at the upper end of the mechanism box 8, an isolation plate 20 is fixedly installed at the bottom of the inner cavity of the cable chamber 3, a spoiler device is rotatably arranged on the upper side edge of the isolation plate 20, a separation plate 17 is fixedly installed at the rear side of the top of the inner cavity of the cable chamber 3, an arc base 19 is fixedly installed at the rear side of the bottom of the inner cavity of the cable chamber 3, and a heat dissipation fan 26 is fixedly installed on the upper side of the arc base 19 at the rear side of the inner cavity of the cable chamber 3;

[0040] A pressure relief chamber 2 is fixedly installed at the rear side of the cable chamber 3, a sealed water tank 9 is fixedly installed at the rear side of the pressure relief chamber 2, an inner conduit 901 is arranged inside the sealed water tank 9, a circulation pump 10 is fixedly installed at the lower end of the sealed water tank 9, one end of the circulation pump 10 is fixedly installed with a circulation pipe 27, the other end of the circulation pump 10 is fixedly connected to the inner conduit 901, and a liquid return pipe 18 is fixedly installed at the lower end of the inner conduit 901;

[0041] A sealed partition 21 is arranged between the cable chamber 3 and the gas chamber 1. A current transformer 16 is fixedly installed in the middle of the gas chamber 1. An isolation frame 24 is fixedly installed at the top of the inner cavity of the gas chamber 1. A heat conducting plate 34 is fixedly installed on the upper side of the isolation frame 24. A metal liquid pipe 33 is foldedly and fixedly installed on the upper side of the heat conducting plate 34. A seal 25 is fixedly installed at one end of the isolation frame 24, and a liquid outlet pipe 23 is fixedly installed at the other end of the isolation frame 24;

[0042] Connecting sealing strips 29 are fixedly installed at the corner positions of the inner cavity of the gas chamber 1. An elastic groove 28 is arranged in the middle of the connecting sealing strips 29. Contact sealing strips 32 are fixedly installed at the outer sides of the connecting sealing strips 29 at the corners of the inner cavity of the gas chamber 1. A pressure chamber 31 is opened in the middle of the contact sealing strips 32;

[0043] A device base 4 is fixedly installed at the lower end of the cable chamber 3. Four cable chambers 3 are arranged side by side at equal intervals on the upper side of the device base 4. A cable door body 5 is rotatably arranged at the front side of the cable chamber 3. Heat dissipation holes 6 are opened at the front side of the cable door body 5. The heat dissipation holes 6 opened in the middle of the front side of the cable door body 5 can facilitate ventilation. The cable door body 5 and the cable chamber 3 are connected by hinges, which is convenient for installers to carry out maintenance and repair;

[0044] The flow disturbance device includes a flow disturbance plate 2001 rotatably arranged on the upper side of the isolation plate 20. A driving fan blade 2002 is fixedly installed on the side of the flow disturbance plate 2001. A circulation pipe 27 is arranged in the middle of the driving fan blade 2002. The flow disturbance plate 2001 and the driving fan blade 2002 are both made of PVC material. A spiral fan blade is arranged in the middle of the driving fan blade 2002. The circulation pipe 27 passes through the side of the driving fan blade 2002. When the liquid inside the circulation pipe 27 passes through the fan blades of the driving fan blade 2002, the water pressure will drive the spiral fan blade inside the driving fan blade 2002 to rotate, thereby driving the flow disturbance plate 2001 to rotate synchronously. When the flow disturbance plate 2001 flips, it can cause the hot air on the upper side of the cable chamber 3 to fluctuate, which is beneficial to heat dissipation. Since the flow disturbance plate 2001 and the driving fan blade 2002 are made of non-conductive materials, it can effectively avoid the generation of induced electric arcs;

[0045] The upper side of the partition board 20 is of an arc structure. The cooling fan 26 is inclined and arranged above the circulation pipe 27. An air outlet 1401 is opened above the rear side of the cable chamber 3. The cooling fan 26 blows air upward and backward. When the cooling fan 26 blows air upward, a low-pressure area is formed at the front side of the separation board 17. The hot air located above the partition board 20 will move towards the bottom of the separation board 17, and thus be blown out backward by the cooling fan 26 and finally sent into the interior of the pressure relief chamber 2 through the air outlet 1401 above the rear side of the cable chamber 3.

[0046] The inner conduit 901 is bent and arranged inside the sealed water tank 9. A vacuum heat insulation groove 902 is fixedly installed in the middle of the sealed water tank 9. Both the pressure relief chamber 2 and the sealed water tank 9 are made of aluminum-type materials. When the internal liquid flows through the inner conduit 901, the heated liquid will be conductively cooled by the sealed water tank 9, and the temperature of the sealed water tank 9 will be directly transmitted to the pressure relief chamber 2, which can effectively expand the heat dissipation area and assist in heat dissipation.

[0047] The upper end of the liquid return pipe 18 is fixedly connected to the liquid outlet pipe 23, and the upper end of the circulation pipe 27 is fixedly connected to the liquid inlet pipe 22. The liquid outlet pipe 23 and the seal 25 are respectively fixedly connected to both ends of the metal liquid pipe 33. The isolation frame 24 is made of PVC material, and the heat conduction plate 34 and the metal liquid pipe 33 are made of aluminum-type materials. The internal liquid pumps the liquid into the partition board 20 through the circulation pump 10. The liquid passes through the circulation pipe 27 and the liquid inlet pipe 22 and enters the metal liquid pipe 33. When the current transformer 16 generates heat, the hot air rises. At this time, the liquid inside the metal liquid pipe 33 will absorb heat, so as to directly assist in heat dissipation inside the gas tank chamber 1. The isolation frame 24 is made of insulating material, which can protect the heat conduction plate 34 above the isolation frame 24 and avoid the arc reaction between the current transformer 16 and the heat conduction plate 34.

[0048] The middle part of the contact sealing strip 32 is a triangular component. An arc-shaped groove is opened on the side of the connecting sealing strip 29. An arc-shaped protrusion corresponding to the connecting sealing strip 29 is arranged on the side of the contact sealing strip 32. Auxiliary sealing air columns 30 are fixedly installed on both sides of the contact sealing strip 32. When the interior of the gas tank chamber 1 is filled with a mixed gas of dry air and nitrogen, as the pressure inside the gas tank chamber 1 increases, the pressure chamber 31 is under pressure and will squeeze the connecting sealing strip 29, causing the interior of the elastic groove 28 to deform. At this time, the corner positions of the gas tank chamber 1 will be further sealed. The auxiliary sealing air columns 30 can play an anti-slip support role, reduce the deformation at the contact position between the contact sealing strip 32 and the connecting sealing strip 29, and increase the friction force.

[0049] A rear cover plate 12 is fixedly installed at the rear side of the air box chamber 1. A number of first pressure relief grooves 1201 are equidistantly formed at the rear side of the rear cover plate 12. A first pressure relief piece 11 is fixedly installed at the position of the rear side of the rear cover plate 12 corresponding to the sealing partition 21. A second pressure relief piece 13 is fixedly installed at the lower part of the rear side of the rear cover plate 12. An explosion-proof plate 15 is fixedly installed at the rear side of the cable chamber 3. A number of second pressure relief grooves 1501 are formed in the middle of the explosion-proof plate 15. A third pressure relief piece 14 is fixedly arranged in the middle of the rear side of the cable chamber 3. One ends of the first pressure relief piece 11, the second pressure relief piece 13 and the third pressure relief piece 14 are fixed by metal bolts, and the other ends are respectively connected to the rear cover plate 12 and the explosion-proof plate 15 by a sealed clamping structure. When the internal pressure of the air box chamber 1 and the cable chamber 3 reaches the limit range, the pressure will break through the first pressure relief piece 11, the second pressure relief piece 13 and the third pressure relief piece 14, and effective pressure relief will be carried out from the position of the pressure relief chamber 2 to protect the safety of the operators.

[0050] The working principle of the present invention: After starting the machine, heat will be generated at the internal wiring position and the current transformer 16 in the cable chamber 3 after a certain period of operation. In the internal space of the cable chamber 3, the heat generated by the components will rise and gather at the top of the cable chamber 3. After the circulation pump 10 is started, the liquid in the circulation pipe 27 flows. When the liquid in the circulation pipe 27 passes through the blades of the driving fan blade 2002, the water pressure will drive the spiral fan blade inside the driving fan blade 2002 to rotate, so as to drive the spoiler 2001 to rotate synchronously. When the spoiler 2001 flips, the hot air on the upper side of the cable chamber 3 can be fluctuated to facilitate heat dissipation. And when the spoiler 2001 flips, after the heat dissipation fan 26 is started, it will blow air to the rear side position of the separation plate 17. At this time, the front side of the separation plate 17 is in a low-pressure area. The heat gathered at the top of the cable chamber 3 will be blown into the lower part behind the isolation plate 20 along with the clockwise rotation of the spoiler 2001, and finally be sent into the pressure relief chamber 2 by the heat dissipation fan 26 through the air outlet 1401. Then, because the heat dissipation air duct connected to the pressure relief chamber 2 discharges the hot air to the outside, and the spoiler 2001 and the driving fan blade 2002 are made of non-conductive materials, it can effectively avoid generating induced electric arcs with the internal components, reduce the risk of internal faults, and during the heat dissipation process, the rotation of the spoiler 2001 can generate a continuous downward wind pressure on the upper side of the isolation plate 20, effectively avoiding the reverse air injection of the U-shaped air duct formed by the separation plate 17 and the isolation plate 20 into the cable chamber 3, so that the air path is unidirectional, that is, it enters from the heat dissipation hole 6 and is discharged from the upper end of the pressure relief chamber 2, avoiding the accumulation of hot air inside the computer room;

[0051] After the circulation pump 10 is started, the liquid inside the device can be circulated. The liquid enters the metal liquid pipe 33 through the isolation plate 20 and the liquid inlet pipe 22. Since the inside of the air box chamber 1 is a sealed space filled with a mixed gas of dry air and nitrogen to reduce arc reaction and debris interference, the internal heat is not easily dissipated. The upper end of the cable chamber 3 is fixedly installed with an isolation frame 24, and a heat conduction plate 34 is fixedly installed on the upper side of the isolation frame 24. When the hot air rises, the heat will heat the heat conduction plate 34 and the metal liquid pipe 33. When the cold liquid passes through the metal liquid pipe 33, a large amount of heat will be carried out. And since the isolation frame 24 is made of insulating material, the isolation frame 24 can effectively isolate the heat conduction plate 34 and the current transformer 16, avoiding the high-voltage electricity from breaking down the internal gas and causing arc reaction. At the same time, since the inside of the device is a mixture of dry air and nitrogen, no water droplets will condense during the heat exchange of the metal liquid pipe 33. When the liquid inside the metal liquid pipe 33 absorbs heat and warms up, it will pass through the liquid outlet pipe 23 and the liquid return pipe 18 and enter the inside of the sealed water tank 9. Since both the sealed water tank 9 and the pressure relief chamber 2 are made of aluminum with high heat conduction performance, the liquid can be effectively circulated and cooled;

[0052] The inner cavity corner position of the air box chamber 1 is fixedly installed with a connection sealing strip 29. An elastic groove 28 is arranged in the middle of the connection sealing strip 29. The inner cavity corner of the air box chamber 1 is fixedly installed with a contact sealing strip 32 outside the connection sealing strip 29. A pressure chamber 31 is opened in the middle of the contact sealing strip 32. As the pressure inside the air box chamber 1 increases, the internal gas will squeeze the connection sealing strip 29, causing the inside of the elastic groove 28 to deform. Since the side of the contact sealing strip 32 is provided with an arc-shaped protrusion corresponding to the connection sealing strip 29, the arc-shaped protrusion position where the contact sealing strip 32 contacts the connection sealing strip 29 will deform, making the contact between the contact sealing strip 32 and the connection sealing strip 29 closer. When the arc-shaped position of the contact sealing strip 32 contacts the connection sealing strip 29, it will squeeze the elastic groove 28, making the corner position of the connection sealing strip 29 and the sealing partition 21 fit more closely, greatly increasing the sealing performance of the connection position. When the pressure of the contact sealing strip 32 increases, the auxiliary sealing air columns 30 arranged on both sides of the contact sealing strip 32 will be stuck on both sides of the arc-shaped slot of the connection sealing strip 29, preventing the contact sealing strip 32 and the connection sealing strip 29 from sliding. Even after long-term use, when the side of the connection sealing strip 29 ages and deforms, the continuous pressure of the contact sealing strip 32 can still make the connection sealing strip 29 have a certain sealing performance, extending the overall service life and reducing the maintenance cost.

[0053] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present invention, and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. An environmentally friendly air-insulated AC metal-enclosed ring main unit switchgear, comprising a cable chamber (3), characterized in that: The upper end of the cable chamber (3) is fixedly installed with an air tank chamber (1). The front side of the air tank chamber (1) is fixedly installed with a mechanism box (8). The upper end of the mechanism box (8) is fixedly installed with an instrument box (7). The bottom of the inner cavity of the cable chamber (3) is fixedly installed with a partition plate (20). A flow disturbing device is rotatably arranged on the upper side edge of the partition plate (20). The rear side of the top of the inner cavity of the cable chamber (3) is fixedly installed with a separation plate (17). The rear side of the bottom of the inner cavity of the cable chamber (3) is fixedly installed with an arc-shaped base (19). A heat dissipation fan (26) is fixedly installed on the upper side of the arc-shaped base (19) at the rear side of the inner cavity of the cable chamber (3); The rear side of the cable chamber (3) is fixedly installed with a pressure relief chamber (2). The rear side of the pressure relief chamber (2) is fixedly installed with a sealed water tank (9). An inner conduit (901) is arranged inside the sealed water tank (9). The lower end of the sealed water tank (9) is fixedly installed with a circulation pump (10). One end of the circulation pump (10) is fixedly installed with a circulation pipe (27). The other end of the circulation pump (10) is fixedly connected to the inner conduit (901). The lower end of the inner conduit (901) is fixedly installed with a liquid return pipe (18); A sealed partition (21) is arranged between the cable chamber (3) and the air tank chamber (1). A current transformer (16) is fixedly installed in the middle of the air tank chamber (1). An isolation frame (24) is fixedly installed at the top of the inner cavity of the air tank chamber (1). A heat conducting plate (34) is fixedly installed above the isolation frame (24). A metal liquid pipe (33) is fixedly installed in a folded manner above the heat conducting plate (34). A seal (25) is fixedly installed at one end of the isolation frame (24). A liquid outlet pipe (23) is fixedly installed at the other end of the isolation frame (24); Connection sealing strips (29) are fixedly installed at the corner positions of the inner cavity of the air tank chamber (1). An elastic groove (28) is arranged in the middle of the connection sealing strips (29). Contact sealing strips (32) are fixedly installed outside the connection sealing strips (29) at the corner positions of the inner cavity of the air tank chamber (1). A pressure chamber (31) is opened in the middle of the contact sealing strips (32).

2. The environmentally friendly air-insulated AC metal-enclosed ring main unit switchgear according to claim 1, wherein: The lower end of the cable chamber (3) is fixedly installed with a device base (4). Four cable chambers (3) are arranged side by side at equal intervals on the upper side of the device base (4). A cable door body (5) is rotatably arranged on the front side of the cable chamber (3). Heat dissipation holes (6) are opened on the front side of the cable door body (5).

3. An environment-friendly air-insulated AC metal-enclosed ring main unit switchgear according to claim 1, characterized in that: The flow disturbing device includes a flow disturbing plate (2001) rotatably arranged on the upper side of the partition plate (20). Driving fan blades (2002) are fixedly installed on the side edges of the flow disturbing plate (2001). A circulation pipe (27) is arranged in the middle of the driving fan blades (2002). The flow disturbing plate (2001) and the driving fan blades (2002) are both components made of PVC material.

4. An environmentally friendly air-insulated AC metal-enclosed ring main unit switchgear according to claim 1, characterized in that: The upper side of the partition plate (20) is of an arc-shaped structure. The heat dissipation fan (26) is inclined and arranged above the circulation pipe (27). An air outlet (1401) is opened above the rear side of the cable chamber (3).

5. An environment-friendly air-insulated AC metal-enclosed ring main unit switchgear according to claim 1, characterized in that: The inner conduit (901) is bent and disposed inside the sealed water tank (9). A vacuum heat insulation groove (902) is fixedly installed in the middle of the sealed water tank (9). Both the pressure relief chamber (2) and the sealed water tank (9) are aluminum-type material components.

6. An environmentally friendly air-insulated AC metal-enclosed ring main unit switchgear according to claim 1, characterized in that: The upper end of the liquid return pipe (18) is fixedly connected to the liquid outlet pipe (23). The upper end of the circulation pipe (27) is fixedly connected to the liquid inlet pipe (22). The liquid outlet pipe (23) and the seal (25) are respectively fixedly connected to both ends of the metal liquid pipe (33). The isolation frame (24) is a PVC-type material component. The heat conduction plate (34) and the metal liquid pipe (33) are aluminum-type material components.

7. An environmentally friendly air-insulated AC metal-enclosed ring main unit switchgear according to claim 1, characterized in that: The middle part of the contact sealing strip (32) is a triangular component. An arc-shaped groove is formed on the side of the connecting sealing strip (29). An arc-shaped protrusion corresponding to the connecting sealing strip (29) is provided on the side of the contact sealing strip (32). Auxiliary sealing air columns (30) are fixedly installed on both sides of the contact sealing strip (32).

8. An environment-friendly air-insulated AC metal-enclosed ring main unit switchgear according to claim 1, characterized in that: A rear cover plate (12) is fixedly installed at the rear side of the air box chamber (1). A plurality of first pressure relief grooves (1201) are equidistantly formed on the rear side of the rear cover plate (12). A first pressure relief piece (11) is fixedly installed at the position of the sealing partition (21) on the rear side of the rear cover plate (12). A second pressure relief piece (13) is fixedly installed below the rear side of the rear cover plate (12). An explosion-proof plate (15) is fixedly installed at the rear side of the cable chamber (3). A plurality of second pressure relief grooves (1501) are formed in the middle of the explosion-proof plate (15). A third pressure relief piece (14) is fixedly arranged in the middle of the rear side of the cable chamber (3).

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