Intelligent ring main unit

Abstract

The application relates to the technical field of ring network cabinets, in particular to an intelligent ring network cabinet which mainly comprises a power ring network cabinet, a moisture-proof mechanism is arranged in the power ring network cabinet, a ring seal mechanism is arranged in the moisture-proof mechanism, an air seal structure is arranged at the back of the ring seal mechanism, a blowing mechanism and a gas distribution mechanism are arranged at the bottom of the moisture-proof mechanism, the blowing mechanism and the gas distribution mechanism are communicated, and heat dissipation mechanisms are arranged on the left and right sides of the moisture-proof mechanism. The blowing mechanism extracts air from a high place, the humidity of the air extracted from the high place is lower than that of the air extracted from a low place, the humidity of the extracted air is reduced, the extracted air is sent into the moisture-proof mechanism through the gas distribution mechanism, the air is dried by the gas distribution mechanism, the inner cavity of the moisture-proof mechanism is kept dry, power devices can work in a dry environment, various problems caused by condensation are avoided, and the safety performance and practicability of the intelligent ring network cabinet are improved.

Description

Technical Field

[0001] This invention relates to the field of ring main unit technology, specifically to an intelligent ring main unit. Background Technology

[0002] Ring main unit (RNU) is a core medium-voltage switchgear in the ring power supply architecture of a power distribution network. It primarily undertakes functions such as line segmentation, load transfer, fault isolation, and power transfer to non-faulty areas. It is widely used in urban power distribution networks, industrial parks, residential communities, and commercial complexes. It is a key terminal device for improving power supply reliability. Existing intelligent RNUs generally include an outer cabinet, from top to bottom, housing an instrument compartment, a switch compartment, and a cable compartment. The cable compartment has a maintenance opening at the front, fitted with an openable cabinet door. The switch compartment houses switching devices and an electromagnetic lock structure. The top of the cabinet door has a lock hole. The side wall of the cable compartment opening has a vertical sliding groove, inside which a guide component fixed to the cabinet door slides. The electromagnetic lock's latch is inserted into the lock hole of the cabinet door. The vertical opening and closing of the cabinet door is guided by the sliding cooperation of the guide component and the sliding groove. The electromagnetic lock's latch and lock hole provide a safety interlock function, allowing the cabinet door to be locked when powered on and unlocked when powered off.

[0003] The existing intelligent ring main unit's cable compartment has an open cavity structure, with the power components and cable joints inside the cable compartment directly exposed to the environment inside the cabinet. Moisture from the underground cable trench can easily seep into the cable compartment along the cable sheath and its internal capillary channels. In addition, humid air can easily seep in through gaps in the cabinet door and cabinet assembly gaps. Under the influence of day and night temperature differences, moisture inside the cabinet can easily condense on the surfaces of insulation components and live joints, leading to surface flashover, joint oxidation, and decreased insulation performance, seriously threatening the safety of equipment operation and the reliability of power supply. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent ring main unit to solve the problems mentioned in the background art, such as the cable compartment of existing intelligent ring main units easily accumulating moisture, forming condensation, and causing electrical faults such as discharge and oxidation, resulting in insufficient equipment operation safety and power supply reliability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A smart ring main unit includes: a power ring main unit, wherein the power ring main unit is provided with a moisture-proof mechanism inside, a ring sealing mechanism is provided inside the moisture-proof mechanism, an air sealing structure is provided on the rear side of the ring sealing mechanism, an air supply mechanism and an air distribution mechanism are provided at the bottom of the moisture-proof mechanism, the air supply mechanism and the air distribution mechanism are connected, and heat dissipation mechanisms are provided on both the left and right sides of the moisture-proof mechanism.

[0006] Preferably, the power ring network cabinet includes a cabinet body, which has an instrument room, a switch room, and a cable room arranged sequentially from top to bottom. The switch room is equipped with a linkage switch and an electromagnetic lock. The cable room has an opening at the front end, and a cabinet door is installed at the opening. A slot is opened on the front side of the opening side wall, and a locking head is slidably inserted into the slot. The locking head is fixedly connected to the edge of the cabinet door. A lock hole is opened on the top surface of the cabinet door, and the bottom end of the electromagnetic lock is movably inserted into the lock hole. A filler strip is fixedly connected to the top surface of the cable room cavity. A fastening opening is opened at the top of the cabinet door, and the fastening opening fastens to the outside of the filler strip. A first cable hole is opened on the bottom surface of the cable room cavity.

[0007] Preferably, the moisture-proof mechanism includes an isolation plate, which is fixedly connected to the inner wall of the cable compartment. A lower chamber is formed on the lower side of the isolation plate, and an upper chamber is formed on the upper side of the isolation plate. An isolation box is fixedly connected to the top surface of the isolation plate. The front end of the isolation box has an opening. A positioning frame is fixedly connected to the inner wall of the isolation box. A closing plate is slidably inserted into the opening. A mounting boss is fixedly connected to the rear end face of the closing plate. The rear end of the mounting boss is slidably inserted into the positioning frame. A sealing gasket is movably fitted outside the mounting boss. The sealing gasket is clamped between the positioning frame and the closing plate. An end plate is fixedly connected to the front end of the closing plate, which extends out of the opening. A finger groove is opened on the front end face of the end plate. A spring sheet is fixedly connected to the rear end face of the cabinet door. The two ends of the spring sheet are bent away from the cabinet door and abut against the surface of the end plate. A controller, a temperature sensor, and a pressure sensor are fixedly installed on the right side of the inner cavity of the isolation box. A humidity sensor is integrated inside the controller. Electrical components are installed on the inner wall of the isolation box.

[0008] Preferably, the ring sealing mechanism includes a fixed plate, which is fixedly installed in the middle of the bottom surface of the inner cavity of the isolation box. A second cable hole is opened on the top surface of the fixed plate. The bottom end of the second cable hole passes through the fixed plate, the bottom wall of the isolation box, and the isolation plate. A docking ring is fixedly connected to the top surface of the fixed plate. An elastic ring is inserted into the inside of the docking ring. A drive cap is threaded onto the outside of the docking ring. A central column is fixedly connected to the top surface of the inner cavity of the drive cap. The bottom end of the central column is slidably inserted into the docking ring. A frustum-shaped groove is opened on the bottom surface of the central column. A third cable hole is opened on the top surface of the drive cap. The third cable hole communicates with the frustum-shaped groove. The cable harness passes through the first cable hole, the second cable hole, the elastic ring, the frustum-shaped groove, and the third cable hole from bottom to top and enters the isolation box.

[0009] Preferably, the air seal structure includes an annular cavity, which is opened inside the fixed plate and located outside the second cable hole. An air jet hole is opened between the second cable hole and the annular cavity, and the air jet hole connects the second cable hole and the annular cavity. The radial outer end of the air jet hole is higher than the radial inner end. A transfer pipe is fixedly connected to the rear side of the fixed plate. The transfer pipe is connected to the annular cavity. An air supply pipe is connected to the rear end of the transfer pipe. The air supply pipe extends upward along the trajectory of the bottom wall and rear wall of the isolation box to the top of the inner cavity of the isolation box.

[0010] Preferably, a pressure-holding column is provided on the rear side of the adapter pipe, and an installation groove is opened at the front end of the pressure-holding column. The adapter pipe is threadedly installed in the installation groove. A constant pressure hole is opened in the rear wall of the inner cavity of the installation groove. An assembly ring is fixedly connected to the rear end face of the pressure-holding column. A cylindrical groove is opened in the rear end face of the assembly ring. The cylindrical groove extends forward in the assembly ring and the pressure-holding column and communicates with the constant pressure hole. A sealing cap is threaded on the outside of the assembly ring. An alignment ring is fixedly inserted inside the sealing cap. The alignment ring is mated with the assembly ring. The inner wall of the alignment ring is flush with the inner wall of the cylindrical groove. A tapered hole is opened in the rear wall of the inner cavity of the sealing cap. A piston disc is slidably inserted inside the alignment ring. A conical plug is fixedly connected to the rear wall of the piston disc. The conical plug is inserted into the tapered hole. A vent hole is opened on the edge of the piston disc. A spring is fixedly connected to the front end face of the vent hole. The spring is inserted into the cylindrical groove. The front end of the spring abuts against the front wall of the inner cavity of the cylindrical groove.

[0011] Preferably, the air supply mechanism includes an exhaust pipe, the bottom end of which bends to the right and passes through the left side wall of the cabinet to enter the lower chamber and is fixedly connected to a fan. The fan is fixedly installed on the bottom wall of the lower chamber. The top end of the exhaust pipe extends upward beyond the top of the cabinet and then bends and turns around to form a U-turn bend. The right outlet of the fan is fixedly connected to a main pipe. The right end of the main pipe is blocked. A branch pipe is connected to the main pipe. The other end of the branch pipe is connected to the inner cavity of the isolation box.

[0012] Preferably, the gas distribution mechanism includes a gas distribution ring located in the lower chamber. An inner conical tube is fixedly connected to the top surface of the gas distribution ring, and a flange is fixedly connected to the top of the inner conical tube. The flange is bolted to the bottom surface of the isolation plate. An outer conical tube is welded to the top surface of the gas distribution ring, and the top of the outer conical tube abuts against the bottom surface of the isolation plate. An air supply hole is provided at the bottom of the side of the outer conical tube. A sleeve is threaded onto the outside of the gas distribution ring, and the top of the sleeve abuts against the bottom surface of the isolation plate. A pressure ring is fixedly connected to the bottom end of the sleeve, and the top surface of the pressure ring abuts against the bottom surface of the gas distribution ring, with a sealing gap between the two surfaces. The sealing ring has air distribution holes on the bottom surface of the inner cavity of the isolation box. The air distribution holes penetrate downward through the bottom wall and isolation plate of the isolation box and are connected to the drying chamber formed by the surface of the outer cone tube, the top surface of the air distribution ring, the inner wall of the sleeve, and the bottom surface of the isolation plate. The drying chamber is filled with granular desiccant. A connector is installed on the bottom surface of the air distribution ring. The bottom end of the connector is connected to the end of the branch pipe. The top end of the connector penetrates through the air distribution ring and is connected to the buffer air chamber formed by the surface of the inner cone tube, the top surface of the air distribution ring, the inner wall of the outer cone tube, and the bottom surface of the isolation plate. The flange, the top of the outer cone tube, and the top of the sleeve are all equipped with sealing gaskets.

[0013] Preferably, a drying tube is sleeved outside the inner conical tube. The drying tube is located in the buffer gas chamber and extends along the trajectory of a conical spiral. The radius of curvature at the top of the drying tube is smaller than that at the bottom. The free end at the bottom of the drying tube is fixedly connected to the connector, and the free end at the top of the drying tube is connected to the buffer gas chamber. A collection box is fixedly connected to the top surface of the air distribution circle. The collection box is located in the buffer gas chamber. A section of the drying tube near the connector passes through the collection box. A leakage hole is opened at the bottom of the section of the drying tube inside the collection box. An installation tube is fixedly inserted into the inner wall of the inner conical tube. The left end of the installation tube extends into the collection box and is fixedly connected to a level gauge. The inside of the collection box is filled with an oil layer and a water layer. The water layer is located below the oil layer, and the surface of the oil layer is located below the level gauge. A drain hole is fixedly connected to the bottom surface of the collection box. The free end of the drain hole passes downward through the air distribution circle and then bends backward to extend out from the rear wall of the cabinet. A drain valve is fixedly installed on the drain hole pipeline. The cross-section of the drying tube is a right trapezoid with the hypotenuse facing downward and the top of the hypotenuse closer to the surface of the inner conical tube.

[0014] Preferably, the heat dissipation mechanism includes a hollow frame located in the air duct chamber formed by the inner wall of the cable compartment, the outer surface of the isolation box, and the top surface of the isolation plate. A hollow tube is fixedly connected between the upper and lower sides of the inner side of the hollow frame. A lower bent pipe is fixedly connected to the bottom surface of the hollow frame, and an upper bent pipe is fixedly connected to the top surface of the hollow frame. The free ends of the lower and upper bent pipes bend towards the direction of the isolation box and extend into the interior of the isolation box. An internal fan is installed at the free end of the upper bent pipe, and an external fan is installed on the back of the cabinet. The external fan is connected to the air duct chamber.

[0015] The beneficial effects that can be achieved by the above embodiments of the present invention include: 1. This invention draws air from a high place using an air supply mechanism. Taking advantage of the fact that the air humidity at a high place is lower than that at a low place, the humidity of the drawn air is reduced. The air supply mechanism then sends the drawn air into the moisture-proof mechanism through an air distribution mechanism. The air distribution mechanism dries the air, thereby keeping the inner cavity of the moisture-proof mechanism dry. This ensures that the power devices operate in a dry environment, avoids various problems caused by condensation, and improves the safety performance and practicality of the intelligent ring main unit.

[0016] 2. This invention seals the gap between the third cable hole and the cable harness through a ring sealing mechanism, preventing moisture from entering the inner cavity of the isolation box. The air-sealing structure maintains a slightly positive pressure in the inner cavity of the isolation box, preventing external air from entering the inner cavity on its own. At the same time, the air-sealing structure slowly blows dry air downwards from all sides of the cable harness. The dry air blows away the moisture rising from the first cable hole, preventing moisture from rising into the inner cavity of the isolation box along the capillary channels inside the cable harness. This ensures that the power devices operate in a dry environment, avoids various problems caused by condensation, and improves the safety performance and practicality of the intelligent ring main unit.

[0017] 3. The gas distribution mechanism of the present invention first uses centrifugal force to reduce the moisture content in the extracted gas, and then uses a desiccant to remove the residual moisture in the extracted gas, thereby reducing the workload of the desiccant and thus reducing the frequency of desiccant replacement. The heat dissipation mechanism draws out the gas inside the isolation box for heat dissipation, achieving heat dissipation while maintaining a dry environment inside the isolation box, so as to maintain the normal operation of the power devices. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 For the present invention Figure 1 A 3D structural diagram of the cabinet door after it has been disassembled; Figure 3 For the present invention Figure 2 A three-dimensional structural diagram of the central moisture barrier mechanism; Figure 4 For the present invention Figure 2 A three-dimensional structural diagram of the cabinet door; Figure 5 For the present invention Figure 2 A three-dimensional structural diagram of the mid-end plate; Figure 6 For the present invention Figure 5 A schematic diagram of the split structure; Figure 7 For the present invention Figure 3 A schematic diagram of the three-dimensional structure from another perspective; Figure 8 For the present invention Figure 3 A three-dimensional structural diagram of the central moisture barrier mechanism; Figure 9 For the present invention Figure 8 A schematic diagram of the disassembled structure of the central ring sealing mechanism; Figure 10 For the present invention Figure 9 A three-dimensional structural diagram of the drive cap; Figure 11 For the present invention Figure 9 A schematic diagram of the three-dimensional structure of the central fixed plate after being cut along the center plane; Figure 12 For the present invention Figure 9 A schematic diagram of the disassembled structure of the gas seal; Figure 13 For the present invention Figure 14 A three-dimensional structural diagram of the central pressure column; Figure 14 For the present invention Figure 8 A schematic diagram of the disassembled structure of the gas distribution mechanism; Figure 15 For the present invention Figure 14 A schematic diagram of the three-dimensional structure from another perspective; Figure 16 For the present invention Figure 14 A three-dimensional structural diagram of the central drying tube; Figure 17 For the present invention Figure 14 A schematic diagram of the three-dimensional structure of the central air-supported ring after it has been cut along the central plane; Figure 18 For the present invention Figure 8 A three-dimensional structural diagram of the heat dissipation mechanism.

[0019] In the picture: 1. Power ring main unit; 101. Cabinet body; 102. Instrument compartment; 103. Switch compartment; 104. Interlocking switch; 105. Electromagnetic lock; 106. Cable compartment; 107. Cabinet door; 108. Card slot; 109. Card head; 110. Lock hole; 111. Filler strip; 112. First cable hole; 2. Moisture-proof mechanism; 201. Isolation plate; 202. Lower chamber; 203. Upper chamber; 204. Isolation box; 205. Positioning frame; 206. Sealing plate; 207. Mounting boss; 208. Sealing gasket; 209. End plate; 210. Finger groove; 211. Spring plate; 212. Controller; 213. Temperature sensor; 214. Pressure sensor; 3. Ring sealing mechanism; 301. Fixed plate; 302. Second cable hole; 303. Connecting ring; 304. Elastic ring; 305. Drive cap; 306. Central column; 307. Frustum-shaped groove; 308. Third cable hole; 4. Air seal structure; 401. Annular cavity; 402. Jet nozzle; 403. Adaptor pipe; 404. Gas delivery pipe; 405. Pressure holding column; 406. Mounting groove; 407. Constant pressure hole; 408. Assembly ring; 409. Cylindrical groove; 410. Sealing cap; 411. Alignment ring; 412. Gradient hole; 413. Piston disc; 414. Vent hole; 415. Spring; 5. Air supply mechanism; 501. Exhaust duct; 502. U-turn bend; 503. Fan; 504. Main pipe; 505. Branch pipe; 6. Air distribution mechanism; 601. Air distribution ring; 602. Inner cone tube; 603. Flange; 604. Outer cone tube; 605. Air inlet; 606. Sleeve; 607. Pressure ring; 608. Air distribution hole; 609. Connector; 610. Drying tube; 611. Collection box; 612. Leakage hole; 613. Mounting tube; 614. Level gauge; 615. Drain hole; 616. Drain valve; 7. Heat dissipation mechanism; 701. Hollow frame; 702. Hollow tube; 703. Lower bend tube; 704. Upper bend tube; 705. Internal fan; 706. External fan. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0022] like Figures 1-18 As shown, this application provides an intelligent ring main unit, including: a power ring main unit 1, a moisture-proof mechanism 2 inside the power ring main unit 1, a ring sealing mechanism 3 inside the moisture-proof mechanism 2, an air sealing structure 4 on the rear side of the ring sealing mechanism 3, an air supply mechanism 5 and an air distribution mechanism 6 at the bottom of the moisture-proof mechanism 2, the air supply mechanism 5 and the air distribution mechanism 6 being connected, and heat dissipation mechanisms 7 on both the left and right sides of the moisture-proof mechanism 2.

[0023] During operation, the air supply mechanism 5 draws air from above the power ring network cabinet 1 and injects it into the moisture-proof mechanism 2 through the air distribution mechanism 6. The air distribution mechanism 6 dries the air to remove moisture and form dry air. Then, the air pressure inside the moisture-proof mechanism 2 increases. The dry air inside the moisture-proof mechanism 2 then flows to the top of the moisture-proof mechanism 2 and blows downwards around the cable harness through the air seal structure 4, blowing away the moisture rising from the bottom of the cable harness and preventing moisture from entering the moisture-proof mechanism 2, thus fundamentally solving the condensation problem. At the same time, the heat dissipation mechanism 7 guides the dry air inside the moisture-proof mechanism 2 out and avoids heat dissipation, ensuring that the inside of the moisture-proof mechanism 2 is in a dry environment to achieve the purpose of heat dissipation.

[0024] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 The power ring main unit 1 includes a cabinet 101. From top to bottom, the cabinet 101 has an instrument compartment 102, a switch compartment 103, and a cable compartment 106. The switch compartment 103 is equipped with a linkage switch 104 and an electromagnetic lock 105. The cable compartment 106 has an opening at the front end, and a cabinet door 107 is installed at the opening. A slot 108 is opened on the front side of the opening side wall. A locking head 109 is slidably inserted into the slot 108. The locking head 109 is fixedly connected to the edge of the cabinet door 107. A lock hole 110 is opened on the top surface of the cabinet door 107. The bottom end of the electromagnetic lock 105 is movably inserted into the lock hole 110. A filling strip 111 is fixedly connected to the top surface of the inner cavity of the cable compartment 106. A fastening opening is opened at the top of the cabinet door 107 and fastens to the outside of the filling strip 111. A first cable hole 112 is opened on the bottom surface of the inner cavity of the cable compartment 106.

[0025] During maintenance, after the worker operates the linkage switch 104 to cut off the power, the electromagnetic lock 105 automatically shortens and is pulled out from the lock hole 110, unlocking the cabinet door 107. Then, the worker applies an upward pushing force to the cabinet door 107, and the cabinet door 107 moves upward in the slot 108 with the latch 109. After that, a pulling force is applied to the cabinet door 107 towards the front, and the cabinet door 107 pulls the latch 109 out of the slot 108. Then, the cabinet door 107 is disassembled, and the door is opened.

[0026] After maintenance, lift cabinet door 107 and insert the locking head 109 into the locking slot 108. Then move cabinet door 107 downward until the locking head 109 moves to the extreme position in the locking slot 108. Next, operate the linkage switch 104 to close the circuit and turn on the power. Then the electromagnetic lock 105 extends and inserts into the lock hole 110 to fix cabinet door 107 and complete the closing.

[0027] Please see Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 8 The moisture-proof mechanism 2 includes an isolation plate 201, which is fixedly connected to the inner wall of the cable chamber 106. A lower chamber 202 is formed on the lower side of the isolation plate 201, and an upper chamber 203 is formed on the upper side of the isolation plate 201. An isolation box 204 is fixedly connected to the top surface of the isolation plate 201. An opening is provided at the front end of the isolation box 204. A positioning frame 205 is fixedly connected to the inner wall of the isolation box 204. A sealing plate 206 is slidably inserted into the opening. A mounting boss 207 is fixedly connected to the rear end face of the sealing plate 206. The rear end of the mounting boss 207 is slidably inserted into the positioning frame 205. A sealing gasket 208 is movably sleeved on the outside of the mounting boss 207. The sealing gasket 208 is clamped between the positioning frame 205 and the sealing plate 206, so that a sealed chamber is formed inside the isolation box 204.

[0028] The front end of the closed plate 206 extends out and is fixedly connected to the end plate 209. The front end face of the end plate 209 is provided with a finger groove 210. The rear end face of the cabinet door 107 is fixedly connected to a spring sheet 211. The two ends of the spring sheet 211 are bent away from the cabinet door 107 and abut against the surface of the end plate 209. The bending elasticity of the spring sheet 211 applies pressure to the end plate 209, so that the whole consisting of the end plate 209, the closed plate 206, and the mounting boss 207 is firmly fixed.

[0029] A controller 212, a temperature sensor 213, and a pressure sensor 214 are fixedly installed on the right side of the inner cavity of the isolation chamber 204. The controller 212 integrates a humidity sensor, and the electrical components are installed on the inner wall of the isolation chamber 204. The controller 212 monitors the internal temperature of the isolation chamber 204 through the temperature sensor 213 and controls the operation of the heat dissipation mechanism 7 based on the temperature monitoring information. When the monitored temperature exceeds the preset value inside the controller 212, the controller 212 controls the operation of the heat dissipation mechanism 7. The controller 212 monitors the internal air pressure of the isolation chamber 204 through the pressure sensor 214. Based on air pressure monitoring information, the controller controls the operating power of the air supply mechanism 5. When the monitored air pressure exceeds the preset value inside the controller 212, the controller 212 controls the air supply mechanism 5 to reduce its operating power. When the monitored air pressure is lower than the preset value inside the controller 212, the controller 212 controls the air supply mechanism 5 to increase its operating power. The controller 212 monitors the humidity inside the isolation box 204 through a humidity sensor. When the humidity monitoring value exceeds the preset value inside the controller 212, the controller 212 sends a warning message to the terminal to remind people to replace the desiccant inside the air distribution mechanism 6.

[0030] Please see Figure 8 , Figure 9 , Figure 10 The sealing mechanism 3 includes a fixed plate 301, which is fixedly installed in the middle of the bottom surface of the inner cavity of the isolation box 204. A second cable hole 302 is provided on the top surface of the fixed plate 301, with its bottom end penetrating downwards through the fixed plate 301, the bottom wall of the isolation box 204, and the isolation plate 201. A docking ring 303 is fixedly connected to the top surface of the fixed plate 301. An elastic ring 304 is inserted inside the docking ring 303, and a drive cap 305 is threaded onto the outside of the docking ring 303. A central column 306 is fixedly connected to the top surface of the inner cavity of 305. The bottom end of the central column 306 is slidably inserted into the docking ring 303. A frustoconical groove 307 is opened on the bottom surface of the central column 306. A third cable hole 308 is opened on the top surface of the drive cap 305. The third cable hole 308 is connected to the frustoconical groove 307. The cable harness passes from bottom to top through the first cable hole 112, the second cable hole 302, the elastic ring 304, the frustoconical groove 307, and the third cable hole 308 into the isolation box 204.

[0031] The rotating drive cap 305 moves downward under the action of the threaded engagement between the drive cap 305 and the mating ring 303. Then, the drive cap 305 moves downward with the center post 306. Next, the center post 306 squeezes the elastic ring 304. Under the constraint of the mating ring 303 and the guiding action of the frustoconical groove 307, the elastic ring 304 is elastically compressed and deformed radially toward the center. Then, the inner wall of the elastic ring 304 adheres to and presses against the surface of the cable harness, sealing the gap between the second cable hole 302 and the cable harness to prevent moisture from rising.

[0032] Please see Figure 9, Figure 11 , Figure 12 , Figure 13 The air seal structure 4 includes an annular cavity 401, which is located inside the fixed plate 301 and outside the second cable hole 302. An air jet hole 402 is provided between the second cable hole 302 and the annular cavity 401, which connects the second cable hole 302 and the annular cavity 401. The radial outer end of the air jet hole 402 is higher than the radial inner end, so that the dry air ejected from the air jet hole 402 is blown downwards at an angle towards the surface of the cable harness, blowing away the moisture that rises through the first cable hole 112.

[0033] A transfer pipe 403 is fixedly connected to the rear side of the fixed plate 301. The transfer pipe 403 is connected to the annular cavity 401. The rear end of the transfer pipe 403 is connected to an air supply pipe 404. The air supply pipe 404 extends upward along the bottom and rear wall of the isolation box 204 to the top of the inner cavity of the isolation box 204. The air distribution mechanism 6 sends dry air into the inner cavity of the isolation box 204 from the bottom of the isolation box 204. Then the dry air flows upward in the inner cavity of the isolation box 204. Then the dry air is blown onto the surface of the cable harness through the air supply pipe 404, the transfer pipe 403, and the air jet hole 402. The flowing dry air will fill the isolation box 204, creating a dry environment. At the same time, it can remove the heat from the power devices and play a role in heat dissipation.

[0034] Please see Figure 9 , Figure 11 , Figure 12 , Figure 13 A pressure-holding column 405 is provided on the rear side of the adapter pipe 403. A mounting groove 406 is provided at the front end of the pressure-holding column 405. The adapter pipe 403 is threadedly installed in the mounting groove 406. A constant pressure hole 407 is provided on the rear wall of the inner cavity of the mounting groove 406. An assembly ring 408 is fixedly connected to the rear end face of the pressure-holding column 405. A cylindrical groove 409 is provided on the rear end face of the assembly ring 408. The cylindrical groove 409 extends forward within the assembly ring 408 and the pressure-holding column 405 and communicates with the constant pressure hole 407. A sealing cap 410 is threaded onto the outside of the assembly ring 408. A sealing cap 410 is fixedly inserted into the inside of the sealing cap 410. Alignment ring 411 is connected to assembly ring 408. The inner wall of alignment ring 411 is flush with the inner wall of cylindrical groove 409. The rear wall of sealing cap 410 has a tapered hole 412. Piston disc 413 is slidably inserted into alignment ring 411. A cone plug is fixedly connected to the rear wall of piston disc 413. The cone plug is inserted into tapered hole 412. Vent hole 414 is opened on the edge of piston disc 413. Spring 415 is fixedly connected to the front end of vent hole 414. Spring 415 is inserted into cylindrical groove 409. The front end of spring 415 abuts against the front wall of cylindrical groove 409.

[0035] As the amount of dry air inside the isolation chamber 204 increases, the internal air pressure gradually increases, followed by an increase in the internal air pressure of the air supply pipe 404. Then, under the action of the pressure difference, the cone plug moves the piston disc 413 closer to the mounting groove 406. After that, the cone plug is pulled out from the converging hole 412. Then, the dry air in the air supply pipe 404 enters the annular cavity 401 through the converging hole 412, the inner cavity of the alignment ring 411, the vent hole 414, the inner cavity of the cylindrical groove 409, the constant pressure hole 407, and the adapter pipe 403. This ensures that a slightly positive pressure is formed inside the isolation chamber 204, creating a pressure difference between the inside and outside of the isolation chamber 204. This ensures that external air cannot enter the inner cavity of the isolation chamber 204 on its own, cutting off the path for air to carry moisture into the inner cavity of the isolation chamber 204, which helps to create a dry environment.

[0036] Please see Figure 3 and Figure 8 The air supply mechanism 5 includes an exhaust pipe 501. The bottom end of the exhaust pipe 501 bends to the right and passes through the left side wall of the cabinet 101 into the lower chamber 202 and is fixedly connected to a fan 503. The fan 503 is fixedly installed on the bottom wall of the inner cavity of the lower chamber 202. The top end of the exhaust pipe 501 extends upward beyond the top end of the cabinet 101 and then bends and turns around to form a U-turn bend pipe 502, so that the opening of the U-turn bend pipe 502 faces downward, reducing the entry of rainwater, dust, foreign objects and the like into the opening of the U-turn bend pipe 502.

[0037] The right outlet of the fan 503 is fixedly connected to the main pipe 504. The right end of the main pipe 504 is blocked. A branch pipe 505 is connected to the main pipe 504. The other end of the branch pipe 505 is connected to the inner cavity of the isolation box 204.

[0038] The operating power of the fan 503 is controlled by the controller 212. The cables and cable bundles between the two are combined and pass through the ring sealing mechanism 3. The fan 503 draws in external air through the exhaust pipe 501 and the U-turn bend 502, and sends the formed dry air into the isolation box 204 through the main pipe 504, the branch pipe 505 and the air distribution mechanism 6. Please see Figure 8 , Figure 14 , Figure 15The gas distribution mechanism 6 includes a gas distribution ring 601 located within the lower chamber 202. An inner conical tube 602 is fixedly connected to the top surface of the gas distribution ring 601, and a flange 603 is fixedly connected to the top of the inner conical tube 602. The flange 603 is bolted to the bottom surface of the isolation plate 201. An outer conical tube 604 is welded to the top surface of the gas distribution ring 601, with its top abutting against the bottom surface of the isolation plate 201. An air inlet 605 is provided at the bottom of the side of the outer conical tube 604. A sleeve 606 is threaded onto the outside of the gas distribution ring 601, with its top abutting against the bottom surface of the isolation plate 201. A pressure ring 607 is fixedly connected to the bottom of the sleeve 606, with its top surface abutting against the bottom surface of the gas distribution ring 601 and a sealing ring between the two surfaces. The bottom surface of the inner cavity of the isolation box 204 is... An air distribution hole 608 is provided, which penetrates downward through the bottom wall of the isolation box 204 and the isolation plate 201, and communicates with the drying chamber formed by the surface of the outer cone tube 604, the top surface of the air distribution circle 601, the inner wall of the sleeve 606, and the bottom surface of the isolation plate 201. The drying chamber is filled with granular desiccant. A connector 609 is installed on the bottom surface of the air distribution circle 601. The bottom end of the connector 609 is connected to the end of the branch pipe 505, and the top end of the connector 609 penetrates through the air distribution circle 601 and communicates with the buffer air chamber formed by the surface of the inner cone tube 602, the top surface of the air distribution circle 601, the inner wall of the outer cone tube 604, and the bottom surface of the isolation plate 201. The flange 603, the outer cone tube 604, and the top of the sleeve 606 are all equipped with sealing gaskets. Desiccant can also be filled in the buffer air chamber to extend the drying process and improve the drying effect.

[0039] Please see Figure 14 , Figure 15 , Figure 16 , Figure 17A drying tube 610 is fitted outside the inner conical tube 602. The drying tube 610 is located in the buffer gas chamber and extends along the trajectory of a conical spiral. The radius of curvature of the top of the drying tube 610 is smaller than that of the bottom. The free end of the bottom of the drying tube 610 is fixedly connected to the connector 609, and the free end of the top of the drying tube 610 is connected to the buffer gas chamber. A collection box 611 is fixedly connected to the top surface of the air distribution circle 601. The collection box 611 is located in the buffer gas chamber. A section of the drying tube 610 near the connector 609 passes through the collection box 611. A leakage hole 612 is opened at the bottom of the section of the drying tube 610 inside the collection box 611. An installation tube 613 is fixedly inserted into the inner wall of the inner conical tube 602. The left end of the installation tube 613 extends into the collection box 611 and is fixedly connected to a level gauge. 614. The collection box 611 is filled with an oil layer and a water layer. The water layer is located below the oil layer, and the surface of the oil layer is located below the level gauge 614. The bottom surface of the collection box 611 is fixedly connected to a drain hole 615. The free end of the drain hole 615 passes downward through the air distribution ring 601 and then bends backward to extend out from the rear wall of the cabinet 101. A drain valve 616 is fixedly installed on the drain hole 615 pipeline. The cross-section of the drying tube 610 is a right trapezoid with the hypotenuse facing downward. The top of the hypotenuse is closer to the surface of the inner cone tube 602, which is used to form a sharp corner at the bottom of the drying tube 610. A V-shaped flow channel can be formed inside the sharp corner, which helps to gather a very small amount of liquid water together to form a water flow, reduce the influence of airflow on the water flow, allow the water flow to flow smoothly downward, and at the same time reduce the exposed area of ​​the water flow, reduce the evaporation rate, and thus reduce the air humidity.

[0040] Air inside branch pipe 505 enters drying pipe 610 through connector 609 and spirals upward along the trajectory of drying pipe 610. Simultaneously, moisture in the air moves outward under centrifugal force until it is intercepted on the outer surface of the inner cavity of drying pipe 610. The moisture then accumulates on the outer surface of the inner cavity of drying pipe 610, forming liquid water. This liquid water then flows downward along the trajectory of drying pipe 610 under gravity and enters the mixed liquid inside collection tank 611 through leakage hole 612. Next, the liquid water passes through the oil layer and enters the water layer. The oil layer seals the water layer, preventing moisture from re-entering the airflow. Afterward, controller 212 monitors the oil layer level using level gauge 614. When the oil level exceeds the maximum value of the preset range inside the controller 212, the controller 212 controls the drain valve 616 to open, and then the water layer is discharged through the drain hole 615 until the oil level reaches the minimum value of the preset range inside the controller 212. Then the controller 212 controls the drain valve 616 to close. During this process, no oil layer is discharged. Then the air inside the drying tube 610 is discharged from the top of the drying tube 610 into the buffer air chamber and from the air supply hole 605 into the drying chamber. After that, the air passes through the gap between the desiccant in the drying chamber. The desiccant removes the moisture in the air and forms dry air. Then the dry air enters the isolation box 204 through the air distribution hole 608.

[0041] Please see Figure 8 and Figure 18 The heat dissipation mechanism 7 includes a hollow frame 701, which is located in the air duct chamber formed by the inner wall of the cable chamber 106, the outer surface of the isolation box 204, and the top surface of the isolation plate 201. A hollow tube 702 is fixedly connected between the upper and lower sides of the inner side of the hollow frame 701. A lower bend tube 703 is fixedly connected to the bottom surface of the hollow frame 701, and an upper bend tube 704 is fixedly connected to the top surface of the hollow frame 701. The free ends of the lower bend tube 703 and the upper bend tube 704 bend towards the direction of the isolation box 204 and extend into the interior of the isolation box 204. An internal fan 705 is installed at the free end of the upper bend tube 704, and an external fan 706 is installed on the back of the cabinet 101. The external fan 706 is connected to the air duct chamber.

[0042] The controller 212 controls the operation of the internal fan 705 and the external fan 706. Driven by the internal fan 705, the dry air inside the isolation box 204 flows back to the isolation box 204 through the internal fan 705, the upper bend pipe 704, the inner cavity of the hollow frame 701, the inner cavity of the hollow pipe 702, and the lower bend pipe 703, forming a circulation. Then, driven by the external fan 706, the external air enters the air duct chamber through various gaps on the power ring network cabinet 1 and carries away the heat through the surfaces of the hollow frame 701 and the hollow pipe 702. After that, it is discharged from the external fan 706, thus achieving heat dissipation. Air holes can be opened on the cabinet door 107 to increase the speed at which air enters the air duct chamber, thereby increasing the heat dissipation speed.

[0043] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0044] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An intelligent ring main unit, comprising: The power ring network cabinet (1) is characterized in that the power ring network cabinet (1) is provided with a moisture-proof mechanism (2) inside, a ring sealing mechanism (3) is provided inside the moisture-proof mechanism (2), an air sealing structure (4) is provided on the rear side of the ring sealing mechanism (3), an air supply mechanism (5) and an air distribution mechanism (6) are provided at the bottom of the moisture-proof mechanism (2), the air supply mechanism (5) and the air distribution mechanism (6) are connected, and a heat dissipation mechanism (7) is provided on both the left and right sides of the moisture-proof mechanism (2).

2. The intelligent ring main unit according to claim 1, characterized in that, The power ring main unit (1) includes a cabinet (101). The cabinet (101) is provided with an instrument room (102), a switch room (103), and a cable room (106) from top to bottom. The switch room (103) is equipped with a linkage switch (104) and an electromagnetic lock (105). The cable room (106) has an opening at the front end, and a cabinet door (107) is installed at the opening. A slot (108) is opened on the front side of the side wall of the opening, and a card head is slidably inserted into the slot (108). (109) The card head (109) is fixedly connected to the edge of the cabinet door (107). The top surface of the cabinet door (107) is provided with a lock hole (110). The bottom end of the electromagnetic lock (105) is movably inserted into the lock hole (110). The top surface of the inner cavity of the cable chamber (106) is fixedly connected with a filler strip (111). The top of the cabinet door (107) is provided with a fastening opening, which is fastened to the outside of the filler strip (111). The bottom surface of the inner cavity of the cable chamber (106) is provided with a first cable hole (112).

3. The intelligent ring main unit according to claim 2, characterized in that, The moisture-proof mechanism (2) includes an isolation plate (201), which is fixedly connected to the inner wall of the cable chamber (106). A lower chamber (202) is formed on the lower side of the isolation plate (201), and an upper chamber (203) is formed on the upper side of the isolation plate (201). An isolation box (204) is fixedly connected to the top surface of the isolation plate (201). An opening is provided at the front end of the isolation box (204). A positioning frame (205) is fixedly connected to the inner wall of the isolation box (204). A closing plate (206) is slidably inserted into the opening. A mounting boss (207) is fixedly connected to the rear end face of the closing plate (206). The rear end of the mounting boss (207) is slidably inserted into the positioning frame (205). A sealing gasket is movably fitted on the outside of the mounting boss (207). The sealing gasket (208) is clamped between the positioning frame (205) and the closing plate (206). The front end of the closing plate (206) extends out and is fixedly connected to the end plate (209). The front end face of the end plate (209) is provided with the finger groove (210). The rear end face of the cabinet door (107) is fixedly connected to the spring sheet (211). The two ends of the spring sheet (211) are bent away from the cabinet door (107) and abut against the surface of the end plate (209). The right side of the inner cavity of the isolation box (204) is fixedly installed with the controller (212), the temperature sensor (213), and the pressure sensor (214). The controller (212) integrates a humidity sensor. The power devices are installed on the inner wall of the isolation box (204).

4. The intelligent ring main unit according to claim 3, characterized in that, The ring sealing mechanism (3) includes a fixed plate (301), which is fixedly installed in the middle of the bottom surface of the inner cavity of the isolation box (204). A second cable hole (302) is opened on the top surface of the fixed plate (301). The bottom end of the second cable hole (302) passes through the fixed plate (301), the bottom wall of the isolation box (204), and the isolation plate (201). A docking ring (303) is fixedly connected to the top surface of the fixed plate (301). An elastic ring (304) is inserted inside the docking ring (303). A drive cap (305) is threaded onto the outside of the docking ring (303). A central column (306) is fixedly connected to the top surface of the inner cavity of the cap (305). The bottom end of the central column (306) is slidably inserted into the docking ring (303). A frustum-shaped groove (307) is opened on the bottom surface of the central column (306). A third cable hole (308) is opened on the top surface of the drive cap (305). The third cable hole (308) is connected to the frustum-shaped groove (307). The cable harness passes through the first cable hole (112), the second cable hole (302), the elastic ring (304), the frustum-shaped groove (307), and the third cable hole (308) from bottom to top and enters the isolation box (204).

5. The intelligent ring main unit according to claim 4, characterized in that, The air seal structure (4) includes an annular cavity (401), which is located inside the fixed plate (301) and outside the second cable hole (302). An air jet hole (402) is provided between the second cable hole (302) and the annular cavity (401). The air jet hole (402) connects the second cable hole (302) and the annular cavity (401). The radial outer end of the air jet hole (402) is higher than the radial inner end. A connecting pipe (403) is fixedly connected to the rear side of the fixed plate (301). The connecting pipe (403) is connected to the annular cavity (401). The rear end of the connecting pipe (403) is connected to an air supply pipe (404). The air supply pipe (404) extends upward along the bottom and rear wall of the isolation box (204) to the top of the inner cavity of the isolation box (204).

6. The intelligent ring main unit according to claim 5, characterized in that, The adapter pipe (403) is provided with a pressure-holding column (405) on its rear side. The pressure-holding column (405) has an installation groove (406) at its front end. The adapter pipe (403) is threadedly installed in the installation groove (406). A constant pressure hole (407) is provided in the rear wall of the inner cavity of the installation groove (406). An assembly ring (408) is fixedly connected to the rear end face of the pressure-holding column (405). A cylindrical groove (409) is provided in the rear end face of the assembly ring (408). The cylindrical groove (409) extends forward in the assembly ring (408) and the pressure-holding column (405) and communicates with the constant pressure hole (407). A sealing cap (410) is threadedly installed on the outside of the assembly ring (408). A sealing cap (410) is fixedly inserted inside the sealing cap (410). Alignment ring (411) is connected to assembly ring (408). The inner wall of alignment ring (411) is flush with the inner wall of cylindrical groove (409). A tapered hole (412) is provided on the rear wall of the inner cavity of sealing cap (410). A piston disc (413) is slidably inserted inside alignment ring (411). A cone plug is fixedly connected to the rear wall of piston disc (413). The cone plug is inserted into the tapered hole (412). A vent hole (414) is provided on the edge of piston disc (413). A spring (415) is fixedly connected to the front end of vent hole (414). The spring (415) is inserted into cylindrical groove (409). The front end of spring (415) abuts against the front wall of inner cavity of cylindrical groove (409).

7. The intelligent ring main unit according to claim 3, characterized in that, The air supply mechanism (5) includes an exhaust pipe (501). The bottom end of the exhaust pipe (501) bends to the right and passes through the left side wall of the cabinet (101) into the lower chamber (202) and is fixedly connected to a fan (503). The fan (503) is fixedly installed on the bottom wall of the inner cavity of the lower chamber (202). The top end of the exhaust pipe (501) extends upward beyond the top end of the cabinet (101) and then bends and turns around to form a bend pipe (502). The right outlet of the fan (503) is fixedly connected to a main pipe (504). The right end of the main pipe (504) is blocked. A branch pipe (505) is connected to the main pipe (504). The other end of the branch pipe (505) is connected to the inner cavity of the isolation box (204).

8. The intelligent ring main unit according to claim 7, characterized in that, The gas distribution mechanism (6) includes a gas distribution ring (601), which is located in the lower chamber (202). The top surface of the gas distribution ring (601) is fixedly connected to an inner conical tube (602), and the top end of the inner conical tube (602) is fixedly connected to a flange (603). The flange (603) is bolted to the bottom surface of the isolation plate (201). An outer conical tube (604) is welded to the top surface of the gas distribution ring (601), and the top end of the outer conical tube (604) abuts against the bottom surface of the isolation plate (201). An air supply hole (605) is opened at the bottom side of the outer conical tube (604). A sleeve (606) is threadedly fitted onto the outside of the gas distribution ring (601), and the top end of the sleeve (606) abuts against the bottom surface of the isolation plate (201). A pressure ring (607) is fixedly connected to the bottom end of the sleeve (606), and the top surface of the pressure ring (607) abuts against the bottom surface of the isolation plate (201). A sealing ring is provided on the bottom surface of the air distribution ring (601) and between the two sides. An air distribution hole (608) is provided on the bottom surface of the inner cavity of the isolation box (204). The air distribution hole (608) penetrates downward through the bottom wall of the isolation box (204) and the isolation plate (201) and communicates with the drying chamber formed by the surface of the outer cone tube (604), the top surface of the air distribution ring (601), the inner wall of the sleeve (606), and the bottom surface of the isolation plate (201). The drying chamber is filled with granular desiccant. A connector (609) is installed on the bottom surface of the air distribution ring (601). The bottom end of the connector (609) is connected to the end of the branch pipe (505). The top end of the connector (609) penetrates through the air distribution ring (601) and communicates with the buffer air chamber formed by the surface of the inner cone tube (602), the top surface of the air distribution ring (601), the inner wall of the outer cone tube (604), and the bottom surface of the isolation plate (201).

9. The intelligent ring main unit according to claim 8, characterized in that, A drying tube (610) is sleeved on the outside of the inner conical tube (602). The drying tube (610) is located in the buffer gas chamber. The drying tube (610) extends along the trajectory of a conical spiral. The radius of curvature of the top of the drying tube (610) is smaller than the radius of curvature of the bottom of the drying tube (610). The free end of the bottom of the drying tube (610) is fixedly connected to the connector (609). The free end of the top of the drying tube (610) is connected to the buffer gas chamber. A collection box (611) is fixedly connected to the top surface of the air distribution circle (601). The collection box (611) is located in the buffer gas chamber. A section of the drying tube (610) near the connector (609) passes through the collection box (611). A leakage hole (6) is opened at the bottom of the section of the drying tube (610) inside the collection box (611). 12) An installation tube (613) is fixedly inserted into the inner wall of the inner cone tube (602). The left end of the installation tube (613) extends into the collection box (611) and is fixedly connected to a level gauge (614). The collection box (611) is filled with an oil layer and a water layer. The water layer is located below the oil layer, and the surface of the oil layer is located below the level gauge (614). The bottom surface of the collection box (611) is fixedly connected to a drain hole (615). The free end of the drain hole (615) passes through the air distribution circle (601) downward and then bends backward to extend out from the rear wall of the cabinet (101). A drain valve (616) is fixedly installed on the drain hole (615) pipeline. The cross section of the drying tube (610) is a right trapezoid. The hypotenuse of the right trapezoid faces downward, and the top of the hypotenuse is closer to the surface of the inner cone tube (602).

10. The intelligent ring main unit according to claim 3, characterized in that, The heat dissipation mechanism (7) includes a hollow frame (701). The hollow frame (701) is located in the air duct chamber formed by the inner wall of the cable chamber (106), the outer surface of the isolation box (204), and the top surface of the isolation plate (201). A hollow tube (702) is fixedly connected between the upper and lower sides of the inner side of the hollow frame (701). A lower bend tube (703) is fixedly connected to the bottom surface of the hollow frame (701). An upper bend tube (704) is fixedly connected to the top surface of the hollow frame (701). The free ends of the lower bend tube (703) and the upper bend tube (704) bend towards the direction of the isolation box (204) and extend into the interior of the isolation box (204). An internal fan (705) is installed at the free end of the upper bend tube (704). An external fan (706) is installed on the back of the cabinet (101). The external fan (706) is connected to the air duct chamber.

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