A leakage-proof ring main unit

Abstract

The application discloses a kind of leak-proof ring network cabinet, relating to switchgear technology field, specifically a kind of leak-proof ring network cabinet, including ring network cabinet body, the front and rear sides of ring network cabinet body are all provided with multiple filter barrels capable of being communicated with it, and filter barrel is fixedly installed with the filter screen of air filtration in the side away from ring network cabinet body, by the setting of ring network cabinet body, filter barrel, filter screen, air suction fan, temperature sensing tube, sealing ring plate, elastic sealing plate, second communication fixed cylinder, extrusion block, press switch and half ball stop block, when temperature rises in ring network cabinet body, air that is purified by filter screen is automatically triggered air suction fan from filter barrel to realize heat dissipation, temperature reduces and automatically stops ventilation and prevents internal air leakage by sealing structure, while only retaining middle filter screen maintains basic natural ventilation, while ensuring clean in cabinet, realize the dynamic balance of heat dissipation and anti-leakage, avoid high temperature to cause damage to electrical components.

Description

Technical Field

[0001] This invention relates to the field of power distribution cabinet technology, and more specifically, to a leak-proof ring main unit. Background Technology

[0002] A ring main unit (RNB) is an electrical device that integrates high-voltage switchgear (including circuit breakers, disconnectors, load switches, etc.) into a metal or non-metal insulated cabinet, or is composed of a modular, interlocking structure. It is widely used in urban power distribution networks, industrial parks, and other scenarios for power distribution and control. Its core components include a current display device for real-time monitoring of circuit current parameters, an observation window for maintenance personnel to observe the operating status of internal components, and the cabinet itself, which provides structural support and external protection. These components work together to ensure the safe and stable operation of the power grid. Based on the technical characteristics of the main insulation medium inside the cabinet, RNBs can be mainly divided into two categories: air-insulated RNBs and SF6 gas-insulated RNBs. Due to the difference in insulation medium, these two types have distinct characteristics in structural design, applicable environments, and performance.

[0003] In actual operation, air-insulated ring main units do not completely isolate the flow of internal and external air. Instead, they achieve "controllable ventilation" through a sophisticated structural design. Specifically, their ventilation system abandons the direct open design and adopts a directional air duct structure. Air inlets are usually set at the bottom or side of the cabinet, and air outlets are set at the top, or air inlets and outlets are set on both sides of the cabinet. By relying on natural convection or forced ventilation, an orderly airflow path is formed, which reduces the direct impact of chaotic external airflow on internal components and guides the air to flow along a preset trajectory. Meanwhile, all air entering the cabinet must be purified by a filter. Furthermore, for core component areas with extremely high insulation requirements, such as the busbar compartment and circuit breaker compartment, the air-insulated ring main unit adopts a partially sealed chamber design. Through sealing strips, precision joints, and other structures, the purified air inside is prevented from leaking out, ensuring a stable insulation environment in the core areas. Other areas of the cabinet (such as the cable compartment and operating mechanism compartment) exchange heat with the outside air through convection, effectively dissipating the heat generated by the equipment operation while meeting insulation requirements, thus forming a balanced design of "insulation and heat dissipation". In existing technologies, such as the external ring main unit for users in windy and sandy areas disclosed in application number 202310871636.2, this device innovatively incorporates a sealing self-inspection mechanism to monitor the sealing performance of the wind-resistant and sand-relief mechanism in real time, specifically addressing the unique characteristics of such environments. When a sealing defect is detected in the wind-resistant and sand-relief mechanism, its built-in leakage warning module promptly issues an alert to staff via audible and visual alarms or remote signal transmission, enabling rapid maintenance and preventing wind and sand intrusion that could affect the pressure relief function. This design is significant for ensuring the basic protection capabilities of equipment in harsh environments with wind, sand, and high dust levels. However, the ring main unit disclosed in this prior art has significant performance shortcomings in practical applications: its overall fully enclosed design, while maximizing the prevention of external wind and sand intrusion, also prevents outside air from entering the cabinet for heat exchange, making it difficult to remove the heat generated during equipment operation through air circulation. Although the device can release high-pressure air inside the cabinet to relieve pressure when the internal temperature rises to the threshold, the pressure relief process only reduces the air pressure and cannot remove heat, so the internal temperature will continue to rise. Prolonged high-temperature environments can have many adverse effects on the electrical components inside the cabinet: for example, the insulation performance of insulating components (such as insulators and bushings) will decrease with increasing temperature, increasing the risk of creepage and breakdown; the contact resistance of metal contacts will increase due to thermal expansion, leading to increased localized heating; and the lifespan of electronic components (such as sensors and control modules) will be significantly shortened due to high temperatures, potentially causing equipment failure and affecting the reliable operation of the power distribution network. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a leak-proof ring main unit, which solves the problems mentioned in the background section.

[0005] The technical solution of this invention is as follows: To achieve the above objectives, the present invention provides the following technical solution: a leak-proof ring main unit, comprising a ring main unit body, wherein multiple filter barrels capable of communicating with the interior are provided on both the front and rear sides of the ring main unit body, and a filter screen for filtering air is fixedly installed on the side of the filter barrel away from the ring main unit body; suction fans capable of drawing air into the ring main unit body from the corresponding filter barrels are provided on the top and bottom of both the front and rear sides of the ring main unit body, respectively; a temperature sensing tube is fixedly installed inside the ring main unit body; a sealing ring plate capable of moving back and forth is provided on the inner circumferential surface of the filter barrel, and a spring is fixedly connected to the center of the sealing ring plate. The filter screen has a rotatable drive barrel located at its center on the side closest to the suction fan. A striking rod, capable of striking the filter screen, is evenly connected to the inner side of the filter barrel. A top block, capable of providing power to the striking rod, is located on the outer circumference of the drive barrel. A mounting ring plate is fixedly connected to the inner circumference of the filter barrel away from the suction fan. A second sealing cylinder, with one end abutting against the sealing ring plate, is fixedly connected to the side of the mounting ring plate closest to the sealing ring plate. An elastic ring plate is fixedly connected to the side of the mounting ring plate away from the second sealing cylinder. Multiple sealing plates, capable of moving towards its axis, are located on the inner circumference of the second sealing cylinder.

[0006] Preferably, the top end of the temperature sensing tube is fixedly connected to a second connecting fixed cylinder with one end disposed on the inner top surface of the ring main unit. A pressing block is slidably connected to the inner circumference of the second connecting fixed cylinder. A push switch with its trigger end exposed inside the second connecting fixed cylinder is provided on the inner top surface of the ring main unit. A plurality of hemispherical blocks capable of blocking the pressing block are provided at the end of the inner circumference of the second connecting fixed cylinder away from the temperature sensing tube. A first mounting groove is respectively opened at the position corresponding to each hemispherical block on the inner circumference of the second connecting fixed cylinder, and the plurality of hemispherical blocks are slidably connected in the corresponding first mounting groove. A first spring with one end disposed on the inner side of the first mounting groove is fixedly connected to the inner side of the hemispherical block.

[0007] Preferably, a second tension spring is fixedly connected to the upper surface of the temperature sensing tube, with one end extending into the second connecting fixed cylinder. The end of the second tension spring away from the temperature sensing tube is fixedly connected to the extrusion block. A first sealing elastic cylinder with one end disposed on the temperature sensing tube is fixedly connected to the side of the extrusion block near the temperature sensing tube. The second tension spring passes through the first sealing elastic cylinder. The inner top surface of the temperature sensing tube is provided with a plurality of first connecting ports that enable the second connecting fixed cylinder to communicate with the temperature sensing tube.

[0008] Preferably, a first connecting fixed cylinder is fixedly connected to the side of the suction fan near the filter barrel. The end of the first connecting fixed cylinder away from the suction fan is fixedly connected to the inner side of the ring network cabinet body, and the end of the first connecting fixed cylinder away from the suction fan is connected to the filter barrel.

[0009] Preferably, a sealing sliding ring plate is fixedly connected to the outer circumferential surface of the sealing ring plate, and the sealing sliding ring plate is slidably connected to the inner circumferential surface of the filter barrel. An annular sliding groove adapted to the sealing sliding ring plate is opened on the inner circumferential surface of the filter barrel. The sealing sliding ring plate is slidably connected in the annular sliding groove. A plurality of first tension springs are fixedly connected to the side of the sealing sliding ring plate away from the suction fan, and the end of the first tension spring away from the sealing sliding ring plate is fixedly connected to the mounting ring plate.

[0010] Preferably, the end of the first connecting fixed cylinder away from the suction fan is fixedly connected to a plurality of sealing guide rods, each having one end penetrating through the sealing sliding ring plate, and the sealing guide rods and the sealing sliding ring plate are slidably connected. A connecting groove is provided in the middle of the outer circumferential surface of the sealing guide rod. The side of the sealing ring plate away from the suction fan is fixedly connected to a first sealing cylinder. The first sealing cylinder is sleeved on the second sealing cylinder and can slide on the second sealing cylinder. A plurality of second connecting ports are evenly penetrating the outer circumferential surface of the first sealing cylinder.

[0011] Preferably, the mounting ring plate has a third communication port on the side near the suction fan, the inner circumferential surface of the second sealing cylinder has a plurality of second mounting grooves that correspond to the position of the sealing plate, the sealing plate is slidably connected in the second mounting groove, and a plurality of third tension springs, one end of which is set in the second mounting groove, are fixedly connected to one side of the sealing plate, and a fourth communication port is opened at the position corresponding to the plurality of second mounting grooves on the outer circumferential surface of the second sealing cylinder.

[0012] Preferably, a first support plate is fixedly connected to the middle of the filter screen, and a drive barrel is rotatably connected to the center of the first support plate near the suction fan. A drive rod extending out of the drive barrel is slidably connected to the inner circumferential surface of the drive barrel, and the end of the drive rod away from the drive barrel is fixedly connected to an elastic sealing plate.

[0013] Preferably, the inner circumferential surface of the drive barrel is provided with a spiral drive groove, and a drive block with one end engaged in the spiral drive groove is fixedly connected to the end of the drive rod away from the elastic sealing plate. A first limiting rod with one end inserted into the drive rod is fixedly connected to the center of the first support plate near the suction fan, and the first limiting rod and the drive rod are slidably connected.

[0014] Preferably, a plurality of auxiliary pull plates are fixedly connected to one end of the inner circumferential surface of the second sealing cylinder near the sealing ring plate, and a second spring with one end set on the striking rod is fixedly connected to the side of the auxiliary pull plate near the striking rod; One end of the top block is fixedly connected to a connecting sliding block that is inserted into the drive barrel. The outer circumferential surface of the drive barrel is provided with a third mounting groove corresponding to the position of the top block. Multiple connecting sliding blocks are slidably connected in the corresponding third mounting grooves. A fourth tension spring is fixedly connected to the side of the connecting sliding block away from the top block, with one end of the spring set in the third mounting groove.

[0015] Beneficial effects This invention provides a leak-proof ring main unit, which has the following beneficial effects: 1. This leak-proof ring main unit, through the arrangement of the ring main unit body, filter barrel, filter screen, suction fan, temperature sensing tube, sealing ring plate, elastic sealing plate, second connecting fixed cylinder, compression block, push switch and hemispherical stop block, can automatically trigger the suction fan to draw in air purified by the filter screen from the filter barrel to achieve heat dissipation when the temperature inside the ring main unit rises. After the temperature drops, ventilation will automatically stop and internal air leakage will be prevented through the sealing structure. At the same time, only the middle filter screen will be retained to maintain basic natural ventilation. This achieves a dynamic balance between heat dissipation and leakage prevention while ensuring the cleanliness inside the cabinet, and avoids damage to electrical components caused by high temperature.

[0016] 2. This leak-proof ring main unit, through the arrangement of the drive barrel, striking rod, top block, sealing plate, first sealing cylinder, second sealing cylinder, elastic ring plate and drive rod, can form a double backflow by utilizing the backflow airflow of the temporary storage space and the airflow generated by the reset of the elastic sealing plate when the suction fan stops working. At the same time, the drive barrel drives the striking rod to strike the filter screen, effectively removing dust and stubborn impurities attached to the surface of the filter screen, avoiding filter screen blockage, maintaining ventilation efficiency and reducing the frequency of manual maintenance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the ring main unit body of the present invention from the left. Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 This is a partial cross-sectional structural diagram of the ring main unit of the present invention, viewed from the front. Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the cooperative structure of the drive rod, drive barrel and first limiting rod of the present invention; Figure 7 This is a schematic diagram of the cooperative structure of the drive barrel, the connecting sliding block, and the top block of the present invention; Figure 8This is a schematic diagram of the mating structure of the sealing sliding ring plate and the sealing guide rod of the present invention.

[0018] In the diagram: 1. Ring main unit body; 2. Baffle plate; 3. Filter barrel; 4. Filter screen; 5. First support plate; 6. First connecting fixed cylinder; 7. Fan; 9. Temperature sensing tube; 10. Press switch; 11. Second connecting fixed cylinder; 12. First sealing elastic cylinder; 13. Extrusion block; 14. Hemispherical stop block; 15. First spring; 16. Striking rod; 17. Drive barrel; 18. Drive rod; 19. First limit rod; 20. Sealing ring plate; 21. Elastic sealing plate; 22. Mounting ring plate; 23. Second spring; 24. First tension spring; 25. Elastic ring plate; 26. Sealing sliding ring plate; 27. Auxiliary pull plate; 28. First sealing cylinder; 29. ​​Top block; 30. Second tension spring; 31. Sealing plate; 32. Third tension spring; 33. Second sealing cylinder; 34. Connecting sliding block; 35. Fourth tension spring; 36. Sealing guide rod. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 The publicly disclosed ring main unit has significant performance shortcomings in practical applications: its fully enclosed design, while maximally preventing the intrusion of external wind and sand, also prevents outside air from entering the cabinet for heat exchange, making it difficult to remove the heat generated by the equipment through air circulation. Although the device can release high-pressure air inside the cabinet to relieve pressure when the internal temperature rises to a threshold, the depressurization process only reduces the air pressure and cannot remove heat, causing the internal temperature to continue to rise. Prolonged high-temperature environments can have various adverse effects on the electrical components inside the cabinet: for example, the insulation performance of insulating components (such as insulators and bushings) will decrease with increasing temperature, increasing the risk of creepage and breakdown; the contact resistance of metal contacts will increase due to thermal expansion, leading to increased localized heating; and the lifespan of electronic components (such as sensors and control modules) will be significantly shortened due to high-temperature environments, potentially causing equipment failure and affecting the reliable operation of the power distribution network. This embodiment is invented to solve the above problems.

[0021] Please see Figures 1 to 8This invention provides a technical solution: a leak-proof ring main unit, including a ring main unit body 1. Multiple filter barrels 3, which can communicate with the interior of the ring main unit body 1, are provided on both the front and rear sides of the ring main unit body 1. A filter screen 4 for filtering air is fixedly installed on the side of the filter barrel 3 away from the ring main unit body 1. A baffle plate 2 is fixedly connected to the end of the filter barrel 3 away from the ring main unit body 1. The baffle plate 2 effectively reduces the direct dripping of rainwater onto the filter screen 4 during windy and rainy weather. The ring main unit body 1 adopts a mature existing technical solution, and for areas where core components with extremely high insulation performance requirements are located, such as the busbar compartment and circuit breaker compartment, a localized baffle plate is used. The sealed chamber design, utilizing sealing strips and precision joints, effectively prevents the leakage of purified air from the inside. Additionally, a desiccant is placed inside the ring main unit 1 to further ensure the dryness of the internal environment. The specific working principle of the ring main unit 1 will not be elaborated here, but one significant difference between this ring main unit 1 and existing technologies is that outside air can only enter the ring main unit 1 through the filter 4. The front, rear, top, and bottom sides of the ring main unit 1 are equipped with suction fans 7 that draw air into the ring main unit 1 from the corresponding filter barrels 3. These fans are fixedly installed inside the ring main unit 1. A temperature sensing tube 9 is provided, which is filled with inert gas. Therefore, when the temperature inside the ring main unit 1 rises, the inert gas in the temperature sensing tube 9 can rise synchronously with the temperature inside the unit. A sealing ring plate 20 that can move back and forth is provided on the inner circumference of the filter barrel 3, and an elastic sealing plate 21 is fixedly connected to the center of the sealing ring plate 20. A rotatable drive barrel 17 is provided at the center of the filter screen 4 near the suction fan 7, and a striking rod 16 that can strike the filter screen 4 is evenly rotatably connected to the inner side of the filter barrel 3. The end of the striking rod 16 away from the drive barrel 17 is rotatably connected to a U-shaped plate through a rotating shaft. The U-shaped plate is away from the striking rod. One end of the rod 16 is fixedly connected to the inner side of the filter barrel 3, and the outer circumferential surface of the drive barrel 17 is provided with a top block 29 that can provide power to the striking rod 16. There are three top blocks 29 in total, and the included angle between adjacent top blocks 29 is equal. The end of the inner circumferential surface of the filter barrel 3 away from the suction fan 7 is fixedly connected to a mounting ring plate 22. The side of the mounting ring plate 22 near the sealing ring plate 20 is fixedly connected to a second sealing cylinder 33, one end of which abuts against the sealing ring plate 20. The side of the mounting ring plate 22 away from the second sealing cylinder 33 is fixedly connected to an elastic ring plate 25. The inner circumferential surface of the second sealing cylinder 33 is provided with a plurality of sealing plates 31 that can move toward its axis.

[0022] Please see Figures 2 to 3The top end of the temperature sensing tube 9 is fixedly connected to a second connecting fixed cylinder 11, one end of which is located on the top surface inside the ring main unit 1. A pressing block 13 is slidably connected to the inner circumference of the second connecting fixed cylinder 11. A push-button switch 10, with its trigger end exposed inside the second connecting fixed cylinder 11, is located on the top surface inside the ring main unit 1. A controller is located inside the ring main unit 1. The push-button switch 10 and the suction fan 7 are both electrically connected to the controller via wires. When the trigger end of the push-button switch 10 is pressurized, the controller immediately controls the suction fan 7 to start. When the pressure at the trigger end disappears, the controller... The controller will stop the suction fan 7 from running. At the same time, the controller and its control principle are existing technologies and will not be described in detail here. The inner circumferential surface of the second connecting fixed cylinder 11 away from the temperature sensing tube 9 is provided with a plurality of hemispherical blocks 14 that can block the extrusion block 13. The inner circumferential surface of the second connecting fixed cylinder 11 and the position corresponding to each hemispherical block 14 are respectively provided with a first mounting groove, and the plurality of hemispherical blocks 14 are slidably connected in the corresponding first mounting groove. A first spring 15 is fixedly connected to the inner side of the hemispherical block 14, one end of which is provided on the inner side of the first mounting groove. A second tension spring 30 is fixedly connected to the upper surface of the temperature sensing tube 9, with one end extending into the second connecting fixed cylinder 11. The end of the second tension spring 30 away from the temperature sensing tube 9 is fixedly connected to the extrusion block 13. A first sealing elastic cylinder 12 with one end set on the temperature sensing tube 9 is fixedly connected to the side of the extrusion block 13 near the temperature sensing tube 9. The first sealing elastic cylinder 12 is made of rubber, and the second tension spring 30 passes through the first sealing elastic cylinder 12. The inner top surface of the temperature sensing tube 9 is provided with a plurality of first connecting ports that enable the second connecting fixed cylinder 11 to connect with the temperature sensing tube 9. The first sealing elastic cylinder 12 effectively prevents inert gas from leaking between the extrusion block 13 and the second connecting fixed cylinder 11. Initially, both the first sealing elastic cylinder 12 and the temperature sensing tube 9 are filled with inert gas. Based on the basic characteristic of gas thermal expansion and contraction, when the inert gas in the temperature sensing tube 9 is heated due to the increased temperature inside the ring main unit 1, it will expand in volume. Since the end of the first sealing elastic cylinder 12 furthest from the extrusion block 13 completely covers the multiple first connecting ports, the expanded inert gas in the temperature sensing tube 9 will flow into the first sealing elastic cylinder 12. At this time, the thrust generated by the expanding inert gas will overcome the tension of the second tension spring 30 on the extrusion block 13, pushing the extrusion block 13 to slide closer to the push switch 10. The hemispherical stop 14 forms a resistance threshold. Only when the inert gas in the temperature sensing tube 9 expands to a certain extent and the thrust generated is sufficient to overcome the resistance of the hemispherical stop 14 can the extrusion block 13 pass over the hemispherical stop 14. After the extrusion block 13 passes over the hemispherical stop 14, it will extrude on the press switch 10. Meanwhile, as the inert gas inside the temperature sensing tube 9 gradually returns to normal temperature as the temperature inside the ring main unit 1 decreases, the gas volume contracts, reducing the thrust. The hemispherical stop 14 delays the reset, preventing the second tension spring 30 from rapidly pulling the pressing block 13 away from the push switch 10. Only when the temperature of the inert gas inside the temperature sensing tube 9 drops to a certain level, and the gas volume contracts to the point where the tension of the second tension spring 30 is sufficient to overcome the resistance of the hemispherical stop 14, will the second tension spring 30 pull the pressing block 13 past the hemispherical stop 14, causing the pressing block 13 to abruptly disengage from the push switch 10. When the pressing block 13 passes the hemispherical stop 14, it pushes the hemispherical stop 14 to overcome the elastic force of the first spring 15 and slide into the first mounting groove.

[0023] A first connecting cylinder 6 is fixedly connected to the side of the suction fan 7 near the filter cartridge 3. The end of the first connecting cylinder 6 away from the suction fan 7 is fixedly connected to the inner side of the ring main unit 1, and the end of the first connecting cylinder 6 away from the suction fan 7 is connected to the filter cartridge 3. A fifth connecting port is provided on the inner side of the ring main unit 1 at a position corresponding to the filter cartridge 3, enabling it to connect with the first connecting cylinder 6. When the suction fan 7 starts working, the first connecting cylinder 6 guides the suction fan 7 to draw in outside air from the corresponding filter screen 4 and deliver it into the ring main unit 1. Simultaneously, the filter screen 4 effectively filters dust particles in the air, preventing them from entering the ring main unit 1 and ensuring that the air entering the unit remains clean.

[0024] Please see Figures 2 to 8 A sealing sliding ring plate 26 is fixedly connected to the outer circumferential surface of the sealing ring plate 20. The sealing sliding ring plate 26 is slidably connected to the inner circumferential surface of the filter barrel 3. Therefore, by setting the sealing ring plate 20, the sealing sliding ring plate 26 and the elastic sealing plate 21, the internal space of the filter barrel 3 can be divided into two parts. The inner circumferential surface of the filter barrel 3 is provided with an annular sliding groove that is adapted to the sealing sliding ring plate 26. The sealing sliding ring plate 26 is slidably connected in the annular sliding groove. A plurality of first tension springs 24 are fixedly connected to the side of the sealing sliding ring plate 26 away from the suction fan 7, and the end of the first tension spring 24 away from the sealing sliding ring plate 26 is fixedly connected to the mounting ring plate 22. Therefore, when the suction fan 7 is working, it will generate negative pressure inside the filter canister 3. Under the action of negative pressure, the sealing ring plate 20, the elastic sealing plate 21 and the sealing sliding ring plate 26 will move synchronously towards the suction fan 7. During the movement of the sealing sliding ring plate 26, the first tension spring 24 will be stretched. When the suction fan 7 stops working, with the help of the elastic force of the first tension spring 24, the sealing sliding ring plate 26 will reset and drive the sealing ring plate 20 and the elastic sealing plate 21 to reset and move synchronously.

[0025] The first connecting fixed cylinder 6 is fixedly connected to a plurality of sealing guide rods 36, one end of which passes through the sealing sliding ring plate 26. The sealing guide rods 36 and the sealing sliding ring plate 26 are slidably connected. A connecting groove is opened in the middle of the outer peripheral surface of the sealing guide rods 36. The first sealing cylinder 28 is fixedly connected to the side of the sealing ring plate 20 away from the suction fan 7. The first sealing cylinder 28 is sleeved on the second sealing cylinder 33 and can slide on the second sealing cylinder 33. A plurality of second connecting ports are evenly penetrated on the outer peripheral surface of the first sealing cylinder 28. When the sealing ring plate 20 moves toward the suction fan 7 under negative pressure, it will drive the first sealing cylinder 28 to slide synchronously. At this time, the mounting ring plate 22, the elastic ring plate 25, the second sealing cylinder 33, the first sealing cylinder 28 and the sealing sliding ring plate 26 together form an annular temporary storage space. As the first sealing cylinder 28 slides along the second sealing cylinder 33, the second connecting port on the first sealing cylinder 28 is gradually exposed. After being filtered by the filter screen 4, the outside air enters the temporary storage space through the second connecting port. At the same time, the movement of the sealing sliding ring plate 26 makes the connecting groove on the sealing guide rod 36 connect with the temporary storage space. The air finally enters the first connecting fixed cylinder 6 through the connecting groove and is sent into the ring network cabinet body 1 by the suction fan 7, thereby cooling the ring network cabinet body 1. When the electrical components inside the ring main unit 1 are working normally and the temperature has not reached the threshold, the suction fan 7 is in a stopped state. At this time, the restoring force of the first tension spring 24 causes the sealing sliding ring plate 26, the sealing ring plate 20 and the elastic sealing plate 21 to completely seal the filter screens 4 at the top and bottom of the front and rear sides, leaving only the filter screens 4 in the middle of the front and rear sides to maintain natural ventilation. While meeting the basic heat dissipation requirements, it minimizes the path of sand and dust intrusion, especially in windy and sandy environments. Meanwhile, when natural ventilation cannot effectively reduce the temperature inside the ring main unit 1, the suction fan 7 will be activated by the squeezing block 13 pressing the button switch 10. It will forcefully draw in outside air to cool down the ring main unit 1. At the same time, it can continuously block sand and dust during the suction process by relying on the filter screen 4 and sealing components, so as to maximize the cleanliness of the ring main unit 1. It can also regulate the temperature inside the cabinet in a timely manner to prevent electrical components from being damaged or burned due to high temperature, thus forming a dynamic balance between protection performance and heat dissipation requirements.

[0026] Example 2 In the above embodiments, although the cleanliness inside the ring main unit 1 can be guaranteed to the maximum extent, and the temperature inside the cabinet can be controlled in a timely manner to effectively prevent electrical components from being damaged or burned due to high temperature, and a dynamic balance is formed between protection performance and heat dissipation requirements, there are still certain limitations in long-term use: the filter screen 4, as a barrier for outside air to enter the cabinet, will continuously adsorb dust particles, suspended impurities and even fine sand particles in the windy and sandy environment on the side away from the suction fan 7. As the usage time increases, these pollutants will gradually accumulate on the surface of the filter screen 4. Initially, it may only cause slight air permeability resistance, but as the accumulation increases, the pores of the filter screen 4 will be gradually blocked, and the air permeability will continue to decline.

[0027] The decrease in this air permeability directly affects the working efficiency of the suction fan 7. When the suction fan 7 starts, due to the weakened ventilation capacity of the filter screen 4, the airflow drawn in from the outside will gradually decrease. This will not only reduce the air replacement efficiency inside the cabinet and affect the heat dissipation effect, but may even cause the suction fan 7 to operate under high load for a long time. More importantly, if it is not cleaned in time, the degree of blockage of the filter screen 4 will continue to increase, which may eventually make the actual air intake of the suction fan 7 unable to meet the cooling requirements. This increases the frequency and difficulty of equipment maintenance and also brings potential hidden dangers to the stable operation of the ring main unit 1. This embodiment is invented to solve the above problems.

[0028] Please see Figures 1 to 8 Based on the above embodiments, the technical solution adopted includes a third communication port on the side of the mounting ring plate 22 near the suction fan 7. At the same time, the elastic ring plate 25 can communicate with the temporary storage space through the setting of the third communication port. The inner circumferential surface of the second sealing cylinder 33 is provided with multiple second mounting grooves that correspond to the positions of the sealing plate 31. The sealing plate 31 is slidably connected in the second mounting grooves, and multiple third tension springs 32 with one end set in the second mounting grooves are fixedly connected to one side of the sealing plate 31. The outer circumferential surface of the second sealing cylinder 33 is provided with fourth communication ports at the positions corresponding to the multiple second mounting grooves. Therefore, by setting the fourth communication port and the second communication port, the temporary storage space and the second mounting groove can be effectively connected. Therefore, when the suction fan 7 stops working, the reset force of the first tension spring 24 will drive the sealing sliding ring plate 26, the sealing ring plate 20 and the first sealing cylinder 28 to reset synchronously. During this reset process, the volume of the temporary storage space shrinks rapidly due to the movement of the components. The air remaining inside is compressed due to the space compression, which in turn squeezes the elastic ring plate 25. The elastic ring plate 25 expands and deforms under the action of air pressure. At the same time, with the help of the through structure of the second and fourth connecting ports, the compressed air will flow into the second mounting groove along the channel. As the air pressure in the second mounting groove increases, the sealing plate 31 inside is pushed to detach from the mounting groove, breaking the closed state of the temporary storage space. At this time, the compressed air in the space will flow back to the filter barrel 3 along the connecting path. The backflowing air forms a strong backflow, which directly acts on the side of the filter screen 4 away from the suction fan 7, which can effectively disperse and peel off the dust, debris and other pollutants attached to the filter screen 4. Furthermore, the elastic sealing plate 21 further enhances the backwash effect: when the suction fan 7 is working, the negative pressure inside the filter canister 3 causes the elastic sealing plate 21 to deform in the direction of the suction fan 7, naturally retaining some air in the recessed area; when the suction fan 7 stops running, the elastic sealing plate 21 quickly returns to its original position due to its elasticity, and the air in the recessed area is quickly squeezed out, forming a double backwash airflow. This airflow generated by the return of the elastic sealing plate 21, together with the air returning from the temporary storage space, works synergistically to significantly improve the self-cleaning efficiency of the filter screen 4 and effectively avoid the problem of mesh clogging caused by long-term use.

[0029] Example 3 In the above embodiments, although air backflushing can clean some of the debris attached to the surface of the filter screen 4 to a certain extent, there are still obvious limitations in actual use: the filter screen 4 is exposed to a complex environment for a long time, and in addition to adsorbing ordinary dust particles, some debris with strong adhesion may also accumulate on its surface. For example, sticky dust mixed with water vapor will form hard clumps, or pollutants that have been accumulated for a long time will form a firm adhesion layer under the action of gravity and static electricity. For such stubborn deposits, it is often difficult to completely remove them by air backflushing alone. This embodiment is invented to solve the above problems.

[0030] Please see Figures 1 to 8 Based on the above embodiments, the technical solution adopted includes a first support plate 5 fixedly connected to the middle of the filter screen 4, and a drive barrel 17 rotatably connected to the center of the first support plate 5 near the suction fan 7, and a drive rod 18 extending to the outside of the drive barrel 17 is slidably connected to the inner circumferential surface of the drive barrel 17, and the end of the drive rod 18 away from the drive barrel 17 is fixedly connected to the elastic sealing plate 21. Therefore, during the deformation and recovery process of the elastic sealing plate 21, the drive rod 18 can be driven to move synchronously, so that the drive rod 18 will move inside the drive barrel 17.

[0031] The inner circumferential surface of the drive barrel 17 is provided with a spiral drive groove. The end of the drive rod 18 away from the elastic sealing plate 21 is fixedly connected to a drive block that is locked in the spiral drive groove. The center of the first support plate 5 near the suction fan 7 is fixedly connected to a first limiting rod 19 that is inserted into the drive rod 18. The first limiting rod 19 and the drive rod 18 are slidably connected. The first limiting rod 19 limits the drive rod 18, allowing it to slide axially within the drive barrel 17 without rotating. When the drive rod 18 slides towards the suction fan 7 along the drive barrel 17, the axial movement of the drive rod can be converted into the rotational motion of the drive barrel 17 by means of the meshing of the drive block and the spiral drive groove, thereby causing the drive barrel 17 to rotate in the forward direction. When the drive rod 18 moves away from the suction fan 7, the drive barrel 17 will rotate in the reverse direction under the opposite action of the drive block and the spiral drive groove, thus realizing the linkage between the axial displacement of the drive rod and the rotation direction of the drive barrel. Multiple auxiliary pull plates 27 are fixedly connected to one end of the inner circumferential surface of the second sealing cylinder 33 near the sealing ring plate 20. A second spring 23 with one end set on the striking rod 16 is fixedly connected to the side of the auxiliary pull plate 27 near the striking rod 16. The number of the second spring 23, the auxiliary pull plate 27 and the striking rod 16 are consistent, and they correspond one-to-one in installation position. When the drive barrel 17 starts to rotate, the top block 29 installed on its outer side will contact the free end of the striking rod 16 as it rotates with the drive barrel 17 through the setting of its inclined surface. The top block 29 will gradually lift it up through the guiding effect of the inclined surface. During this process, as the striking rod 16 is lifted, the second spring 23 connected to it will be compressed synchronously. This process actually converts mechanical energy into the elastic potential energy of the spring, storing energy for the subsequent reset action. Once the top block 29 has completely passed through the striking rod 16, the unsupported striking rod 16 will gain a powerful force the instant the second spring 23 releases its elastic potential energy, thus striking the filter screen 4 at a relatively high speed. From a physical perspective, the impact force generated by this instantaneous impact will be converted into vibration waves that propagate on the filter screen 4. Since the filter screen 4 and the debris adsorbed on it have different natural frequencies, the vibration will disrupt the balance of the adsorption forces between the two, causing those debris with stronger adhesion to tend to separate from the filter screen surface. Meanwhile, the dimensions of the fourth connecting port and the second mounting slot were differentiated. The diameter of the fourth connecting port is relatively small, which can effectively slow down the flow rate of air in the temporary storage space entering the second mounting slot through the fourth connecting port. More importantly, during the reset process of the elastic sealing plate 21, it needs to drive the drive barrel 17 to rotate in the opposite direction at the same time, and cause one end of the striking rod 16 to be raised through the top block 29. Therefore, this series of compound actions will create a certain resistance to the reset of the elastic sealing plate 21, making its reset process non-instantaneous. Therefore, the striking action of the striking rod 16 on the filter screen 4 and the air backflushing process can be superimposed in time. When the striking occurs, the slowly flowing air will form a continuous backflushing force on the surface of the filter screen. This fluid impact force and the mechanical vibration generated by the striking form a synergistic effect. The vibration breaks the adsorption and binding of impurities to the filter screen, while the air backflushing uses the shearing force of the airflow to further peel off and carry away the loosened impurities. The dual combined effect of the two creates a composite cleaning mechanism from a mechanical point of view, which significantly improves the removal effect of stubborn impurities on the filter screen 4. Compared with a single cleaning method, this synergistic effect can more comprehensively cover the surface of the filter screen, especially effectively cleaning those small impurities hidden in the pores of the filter screen. One end of the top block 29 that is in contact with the drive barrel 17 is fixedly connected to a connecting sliding block 34 that is inserted into the drive barrel 17. The outer circumferential surface of the drive barrel 17 is provided with a third mounting groove corresponding to the position of the top block 29. Multiple connecting sliding blocks 34 are slidably connected in the corresponding third mounting grooves. A fourth tension spring 35 with one end set in the third mounting groove is fixedly connected to the side of the connecting sliding block 34 away from the top block 29. When the drive barrel 17 rotates in the forward direction, since the side of the top block 29 that contacts the sealing sliding ring plate 26 is also designed as an inclined surface, the striking rod 16 will naturally push the top block 29 away from the drive barrel 17, thus creating conditions for the top block 29 to pass over the striking rod 16. As the striking rod 16 pushes up the top block 29, the top block 29 drives the connecting sliding block 34 to move synchronously. At this time, the connecting sliding block 34 slides along the third mounting groove, thereby stretching the fourth tension spring 35. After the top block 29 successfully passes the striking rod 16, the stretched fourth tension spring 35 quickly releases its elastic potential energy and rapidly pulls the connecting sliding block 34 through its own contraction force, causing the connecting sliding block 34 to drive the top block 29 to quickly return to its initial position, preparing for the next action.

[0032] In summary, when the electrical components inside the ring main unit 1 are working normally and the temperature has not reached the threshold, the suction fan 7 is in a stopped state. At this time, the restoring force of the first tension spring 24 causes the sealing sliding ring plate 26, the sealing ring plate 20 and the elastic sealing plate 21 to completely seal the filter screens 4 at the top and bottom of the front and rear sides of the ring main unit 1, leaving only the filter screens 4 in the middle of the front and rear sides to maintain natural ventilation. The shielding plate 2 can reduce the situation where rainwater drips directly onto the filter screens 4 in windy and rainy weather. The desiccant inside the ring main unit 1 further ensures the dryness of the internal environment. In addition, the local sealed cavities of core component areas such as the busbar compartment and the circuit breaker compartment prevent leakage of internal purified air through the sealing strips, precision joints and other structures. When the temperature inside the ring main unit 1 rises, the inert gas in the temperature sensing tube 9 expands with the temperature increase. The expanded gas flows into the first sealing elastic cylinder 12, pushing the extrusion block 13 to overcome the tension of the second tension spring 30 and the resistance of the hemispherical stop block 14. After passing the hemispherical stop block 14, it extrudes the press switch 10, and the controller then controls the suction fan 7 to start. The suction fan 7 draws outside air from the corresponding filter barrel 3 through the first connecting fixed cylinder 6. The negative pressure generated in the filter barrel 3 causes the sealing ring plate 20, the elastic sealing plate 21 and the sealing sliding ring plate 26 to move synchronously towards the suction fan 7 and stretch the first tension spring 24. The first sealing cylinder 28 slides along the second sealing cylinder 33 to expose the second connecting port. After being filtered by the filter screen 4, the outside air enters the temporary storage space through the second connecting port, enters the first connecting fixed cylinder 6 through the connecting groove of the sealing guide rod 36, and is finally sent into the ring main unit 1 by the suction fan 7 to achieve cooling. During this process, the elastic sealing plate 21 is deformed due to negative pressure, which drives the drive rod 18 to slide inside the drive barrel 17. With the cooperation of the drive block and the spiral drive groove, the drive barrel 17 rotates in the forward direction. When the top block 29 passes the striking rod 16, the connecting sliding block 34 slides along the third mounting groove and stretches the fourth tension spring 35. After the top block 29 passes, the fourth tension spring 35 pulls the connecting sliding block 34 and the top block 29 to reset.

[0033] When the temperature inside the ring main unit 1 drops, the inert gas inside the temperature sensing tube 9 contracts, and the tension of the second tension spring 30 overcomes the resistance of the hemispherical stop block 14, pulling the squeezing block 13 away from the press switch 10. The controller then controls the suction fan 7 to stop running. The first tension spring 24 drives the sealing sliding ring plate 26, the sealing ring plate 20, and the first sealing cylinder 28 to reset. The volume of the temporary storage space shrinks, causing the internal air to be compressed. The air flows into the second mounting groove through the second and fourth connecting ports, opening the sealing plate 31 and forming a backflow airflow to flush the filter screen 4. At the same time, the airflow generated by the reset of the elastic sealing plate 21 works synergistically with the backflow airflow. The reset of the elastic sealing plate 21 drives the drive rod 18 to move, causing the drive barrel 17 to rotate in the opposite direction. Through the top block 29, the striking rod 16 strikes the filter screen 4, achieving a dual cleaning effect of backflow and striking. This ensures that the filter screen 4 is clean to maintain ventilation efficiency and ensures the stable operation of the ring main unit 1.

[0034] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A leak-proof ring main unit, comprising a ring main unit body (1), characterized in that: The front and rear sides of the ring main unit (1) are provided with multiple filter barrels (3) that can communicate with them. A filter screen (4) for filtering air is fixedly installed on the side of the filter barrel (3) away from the ring main unit (1). The top and bottom of the front and rear sides of the ring main unit (1) are provided with suction fans (7) that can draw air into the ring main unit (1) from the corresponding filter barrels (3). A temperature sensing tube (9) is fixedly installed inside the ring main unit (1). A sealing ring plate (20) that can move back and forth is provided on the inner circumferential surface of the filter barrel (3). An elastic sealing plate (21) is fixedly connected to the center of the sealing ring plate (20). A rotating drive is provided at the center of the side of the filter screen (4) near the suction fan (7). The filter barrel (3) is uniformly rotatably connected to a striking rod (16) that can strike the filter screen (4), and the outer circumferential surface of the drive barrel (17) is provided with a top block (29) that can provide power to the striking rod (16). The end of the inner circumferential surface of the filter barrel (3) away from the suction fan (7) is fixedly connected to a mounting ring plate (22). The side of the mounting ring plate (22) near the sealing ring plate (20) is fixedly connected to a second sealing cylinder (33) with one end abutting against the sealing ring plate (20). The side of the mounting ring plate (22) away from the second sealing cylinder (33) is fixedly connected to an elastic ring plate (25). The inner circumferential surface of the second sealing cylinder (33) is provided with a plurality of sealing plates (31) that can move toward its axis. The top end of the temperature sensing tube (9) is fixedly connected to a second connecting fixed cylinder (11) with one end set on the inner top surface of the ring main body (1). The inner circumference of the second connecting fixed cylinder (11) is slidably connected to a squeezing block (13). The inner top surface of the ring main body (1) is provided with a push switch (10) with the trigger end exposed in the second connecting fixed cylinder (11). The inner circumference of the second connecting fixed cylinder (11) away from the temperature sensing tube (9) is provided with a plurality of hemispherical blocks (14) that can block the squeezing block (13). The inner circumference of the second connecting fixed cylinder (11) and the position corresponding to each hemispherical block (14) are respectively provided with a first mounting groove, and the plurality of hemispherical blocks (14) are slidably connected in the corresponding first mounting groove. The inner side of the hemispherical block (14) is fixedly connected with a first spring (15) with one end set on the inner side of the first mounting groove.

2. The leak-proof ring main unit according to claim 1, characterized in that: A second tension spring (30) is fixedly connected to the upper surface of the temperature sensing tube (9), with one end extending into the second connecting fixed cylinder (11). The end of the second tension spring (30) away from the temperature sensing tube (9) is fixedly connected to the extrusion block (13). A first sealing elastic cylinder (12) with one end set on the temperature sensing tube (9) is fixedly connected to the side of the extrusion block (13) near the temperature sensing tube (9). The second tension spring (30) passes through the first sealing elastic cylinder (12). The inner top surface of the temperature sensing tube (9) is provided with a plurality of first connecting ports that can cause the second connecting fixed cylinder (11) to connect with the temperature sensing tube (9).

3. A leak-proof ring main unit according to claim 2, characterized in that: The suction fan (7) is fixedly connected to a first connecting fixed cylinder (6) on the side near the filter barrel (3). The end of the first connecting fixed cylinder (6) away from the suction fan (7) is fixedly connected to the inner side of the ring network cabinet body (1), and the end of the first connecting fixed cylinder (6) away from the suction fan (7) is connected to the filter barrel (3).

4. A leak-proof ring main unit according to claim 3, characterized in that: A sealing sliding ring plate (26) is fixedly connected to the outer circumferential surface of the sealing ring plate (20). The sealing sliding ring plate (26) is slidably connected to the inner circumferential surface of the filter barrel (3). The inner circumferential surface of the filter barrel (3) is provided with an annular sliding groove that is adapted to the sealing sliding ring plate (26). The sealing sliding ring plate (26) is slidably connected in the annular sliding groove. A plurality of first tension springs (24) are fixedly connected to the side of the sealing sliding ring plate (26) away from the suction fan (7). The end of the first tension spring (24) away from the sealing sliding ring plate (26) is fixedly connected to the mounting ring plate (22).

5. A leak-proof ring main unit according to claim 4, characterized in that: The first connecting fixed cylinder (6) is fixedly connected to a plurality of sealing guide rods (36) at one end of which are all through the sealing sliding ring plate (26), and the sealing guide rods (36) and the sealing sliding ring plate (26) are slidably connected. A connecting groove is provided in the middle of the outer peripheral surface of the sealing guide rod (36). The first sealing cylinder (28) is fixedly connected to the side of the sealing ring plate (20) away from the suction fan (7). The first sealing cylinder (28) is sleeved on the second sealing cylinder (33), and the first sealing cylinder (28) can slide on the second sealing cylinder (33). A plurality of second connecting ports are evenly penetrated on the outer peripheral surface of the first sealing cylinder (28).

6. A leak-proof ring main unit according to claim 5, characterized in that: The mounting ring plate (22) has a third communication port on the side near the suction fan (7). The inner circumferential surface of the second sealing cylinder (33) has multiple second mounting grooves that correspond to the positions of the sealing plate (31). The sealing plate (31) is slidably connected in the second mounting groove, and multiple third tension springs (32) with one end set in the second mounting groove are fixedly connected to one side of the sealing plate (31). The outer circumferential surface of the second sealing cylinder (33) has a fourth communication port at the position corresponding to the multiple second mounting grooves.

7. A leak-proof ring main unit according to claim 6, characterized in that: The filter screen (4) is fixedly connected to the middle of a first support plate (5), and the center of the first support plate (5) near the suction fan (7) is rotatably connected to a drive barrel (17), and a drive rod (18) extending out of the drive barrel (17) is slidably connected to the inner circumferential surface of the drive barrel (17), and the end of the drive rod (18) away from the drive barrel (17) is fixedly connected to an elastic sealing plate (21).

8. A leak-proof ring main unit according to claim 7, characterized in that: The inner circumferential surface of the drive barrel (17) is provided with a spiral drive groove. The end of the drive rod (18) away from the elastic sealing plate (21) is fixedly connected to a drive block that is locked in the spiral drive groove. The center of the first support plate (5) near the suction fan (7) is fixedly connected to a first limiting rod (19) that is inserted into the drive rod (18). The first limiting rod (19) and the drive rod (18) are slidably connected.

9. A leak-proof ring main unit according to claim 8, characterized in that: A plurality of auxiliary pull plates (27) are fixedly connected to one end of the inner circumferential surface of the second sealing cylinder (33) near the sealing ring plate (20). A second spring (23) with one end set on the striking rod (16) is fixedly connected to one side of the auxiliary pull plate (27). The top block (29) is fixedly connected to a connecting sliding block (34) with one end inserted into the drive barrel (17) at one end. The drive barrel (17) has a third mounting groove on its outer circumferential surface corresponding to the position of the top block (29). Multiple connecting sliding blocks (34) are slidably connected in the corresponding third mounting grooves. A fourth tension spring (35) with one end set in the third mounting groove is fixedly connected to the side of the connecting sliding block (34) away from the top block (29).

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