Standardized ac metal-enclosed high-voltage switchgear

Abstract

The application relates to a standardized alternating-current metal-enclosed high-voltage switchgear, and relates to the field of high-voltage switchgears, which comprises a cabinet body and a bottom box installed at the bottom of the cabinet body, the bottom box comprises a bottom box side wall, an upper layer bottom plate, a lower layer bottom plate, a one-way drainage valve and the like structures, the upper layer bottom plate is provided with a water leakage hole, a water collecting and draining cavity is formed between the upper layer bottom plate and the lower layer bottom plate, the lower layer bottom plate is inclined and provided with a drainage port, the one-way drainage valve can drain water and prevent backflow, and the bottom box is further provided with a reinforcing rib, a supporting plate, an insect screen, a mounting flange, an inspection window, a cable sealing assembly and the like components. The application achieves the technical effects of effective water drainage, prevention of reverse entry of external fluid, protection of cables, enhancement of structural strength, prevention of entry of insects and rodents and the like.

Description

Technical Field

[0001] This application relates to the field of high-voltage switchgear, and in particular to a standardized AC metal-enclosed high-voltage switchgear. Background Technology

[0002] In power systems, standardized AC metal-enclosed high-voltage switchgear is a key component ensuring the safe and stable operation of the power grid. This type of equipment is widely used in substations, industrial enterprises, and other locations, enabling functions such as circuit switching control, protection, and monitoring. With the continuous development of the power industry, higher requirements are being placed on the performance, reliability, and safety of high-voltage switchgear. Its stable operation is crucial for ensuring the continuity and quality of power supply, directly impacting various sectors including industrial production and residential life.

[0003] In the past, the conventional methods for handling and protecting against water accumulation in the base box of high-voltage switchgear designs have mainly included several approaches. Some systems employ a single base plate structure, relying on external drainage facilities to manage water accumulation. This involves connecting drainage pipes to the outside of the base box to guide the water to a designated drainage area. Others involve installing simple drainage holes in the base box, but this method lacks an effective control mechanism and cannot prevent the backflow of external moisture. Additionally, some equipment uses only simple sealing measures at cable entry and exit points, such as using ordinary rubber rings, which have limited effectiveness in preventing insects and rodents from entering and infiltrating the water.

[0004] However, a single base plate structure cannot effectively separate cables from accumulated water, allowing cables to easily become submerged, thus affecting their insulation performance and increasing safety hazards. Simple drainage holes cannot prevent external humid air, corrosive gases, and insects and rodents from entering the base box through drainage channels, potentially leading to a deterioration of the internal environment and damage to equipment components. Ordinary cable sealing measures are insufficient to effectively prevent the intrusion of external moisture and insects and rodents in the long term; once the seal fails, it can cause serious damage to the equipment. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical problems and provide a standardized AC metal-enclosed high-voltage switchgear.

[0006] A standardized AC metal-enclosed high-voltage switchgear includes a cabinet, with a base box installed at the bottom of the cabinet. The base box includes: The bottom sidewalls enclose and form a frame structure with internal storage space, and the top of the bottom sidewalls is used to connect to the cabinet. The upper bottom plate is installed on the upper inner side of the side wall of the bottom box. Multiple drainage holes are opened on the surface of the upper bottom plate, and the drainage holes penetrate the thickness of the upper bottom plate. The lower bottom plate is installed in the lower inner area of ​​the side wall of the bottom box. A water collection and drainage cavity is formed between the upper bottom plate and the lower bottom plate. The upper surface of the lower bottom plate is constructed as an inclined surface, which gradually decreases in a predetermined direction. A drain outlet is provided at the lowest point of the inclined surface. A one-way drain valve is installed at the drain outlet. The one-way drain valve includes a valve body, a valve core, and a sealing structure. A water flow channel is formed inside the valve body, and the valve core is located inside the water flow channel. The one-way drain valve is configured to allow water in the water collection and drainage chamber to be discharged to the outside of the bottom tank through the water flow channel of the valve body, and to prevent external fluids from entering the water collection and drainage chamber in the reverse direction through the water flow channel. The valve core includes an air bladder with a deformable surface and a water passage hole. The one-way drain valve is further configured such that when external fluid enters the water flow channel in the opposite direction, the air bladder is displaced and / or deformed under the action of the reverse fluid, so that the water passage hole abuts against the sealing surface on the valve body to block the water flow channel.

[0007] By adopting the above technical solution, the upper bottom plate divides the internal space of the bottom box into a cable installation area and a water collection and drainage area, realizing the physical separation of cables and water accumulation, and eliminating the risk of cable joints being soaked in water. The inclined surface design of the lower bottom plate allows water to flow spontaneously to the drain under the action of gravity, realizing zero-energy consumption and maintenance-free automatic drainage. The one-way drain valve allows the internal water to be discharged, and the airbag structure blocks the water flow channel under the action of reverse fluid, preventing external humid air, corrosive gases and insects and rodents from entering the bottom box in reverse.

[0008] Optionally, a reinforcing rib is welded and fixed to the inner side of the bottom box side wall. The reinforcing rib is arched, and the middle part of the reinforcing rib protrudes towards the lower surface of the upper bottom plate and abuts against the surface of the upper bottom plate.

[0009] By adopting the above technical solution, the arched reinforcing ribs provide multi-point support to the lower surface of the upper base plate, effectively improving the load-bearing capacity and bending stiffness of the upper base plate, preventing denting deformation caused by long-term cable weight and external impact, and extending the service life of the base box structure. The reinforcing ribs are welded and fixed to the inner side wall of the base box, forming an integrated force-bearing system with the side wall, enhancing the lateral stiffness and torsional performance of the entire base box frame, and maintaining structural stability during transportation, installation and long-term operation. The reinforcing ribs are located inside the water collection and drainage cavity, below the upper base plate, without occupying the upper cable installation space, and without affecting cable wiring and fixing, thus maintaining the integrity and usability of the upper space while enhancing structural strength.

[0010] Optionally, a support plate is fixedly connected to the reinforcing rib. The support plate is used to support the cable extending into the water collection and drainage cavity, so that the cable is suspended relative to the upper surface of the lower base plate.

[0011] By adopting the above technical solution, the support plate provides independent load-bearing support for the cable extending into the water collection and drainage cavity, keeping the cable suspended from the inclined surface of the lower base plate. Even if there is temporary water accumulation in the water collection and drainage cavity, the cable will not come into contact with the water, providing double protection for the cable. The suspension of the cable avoids the "dam" effect formed by contact with the inclined surface of the lower base plate, ensuring that the water flows smoothly along the inclined surface to the drainage outlet and does not create local water accumulation dead zones. The suspension of the cable allows the surrounding air to circulate freely, which is conducive to the dissipation of heat during cable operation, reduces the temperature rise of the cable during operation, and delays insulation aging.

[0012] Optionally, the airbag is integrally formed in the central region of the valve core, the airbag protrudes from at least one side surface of the valve core, and the water passage is opened in the edge region of the airbag.

[0013] By adopting the above technical solution, the airbag is integrally molded into the central area of ​​the valve core and protrudes from the valve core surface, making the airbag more sensitive to changes in reverse fluid pressure. It can quickly reverse seal under relatively small reverse water pressure, improving protection reliability. The water passage hole is opened in the edge area of ​​the airbag, balancing water passage efficiency and sealing. Furthermore, the integral molding of the airbag and valve core simplifies the manufacturing process, reduces costs, and improves the overall sealing reliability of the valve core. Optionally, a valve seat is provided inside the valve body, and the valve core is installed on the side of the valve seat near the valve body outlet. When external fluid enters in reverse, the airbag is displaced towards the valve seat under the action of the reverse fluid until the water passage hole abuts against the surface of the valve seat.

[0014] By adopting the above technical solution, the airbag is integrally molded in the central area of ​​the valve core and protrudes from the valve core surface, while the water passage hole is opened in the edge area of ​​the airbag, which improves the reverse sealing sensitivity, balances water flow efficiency and sealing, and simplifies the manufacturing process. The valve body has an internal valve seat, and the valve core is installed on the valve seat near the valve body outlet. When external fluid enters in reverse, the airbag moves towards the valve seat, causing the water passage hole to abut against the valve seat surface. This achieves adaptive enhancement of sealing force with reverse pressure, zero obstruction of forward drainage, and precise valve core installation positioning.

[0015] Optionally, insect screens are fixedly installed at both the inlet and outlet of the valve body, covering both the inlet and outlet.

[0016] By adopting the above technical solution, the insect-proof net at the outlet can prevent external foreign objects from flowing back into the valve body, protect the integrity of the airbag and the sealing performance, and extend the service life of the one-way drain valve.

[0017] Optionally, mounting flanges are provided at the four edges of the upper base plate, and mounting ears are welded and fixed on the inner side of the bottom box side wall. The mounting flanges and mounting ears are fitted together and fastened by threaded connectors.

[0018] By adopting the above technical solution, a detachable connection between the upper base plate and the side wall of the bottom tank is achieved, which facilitates deep cleaning of the inside of the water collection and drainage chamber or maintenance of the one-way drain valve; the cooperation between the mounting flange and the mounting ear provides a clear horizontal installation reference surface for the upper base plate, ensuring that the upper base plate is at the designed height and level after installation; the mounting flange is set with multiple connection points continuously or at intervals along the circumference of the upper base plate, so that the load of the upper base plate is evenly transferred to the side wall of the bottom tank, avoiding local deformation or connection failure caused by stress concentration.

[0019] Optionally, a sealing strip made of elastic sealing material is sandwiched between the mounting flange and the mounting lug, and the sealing strip extends continuously along the circumference of the upper base plate.

[0020] By adopting the above technical solution, the clamped sealing strip forms a continuous airtight and watertight interface, preventing water leakage from the surface of the upper bottom plate. It can adaptively compensate for changes in sealing pressure, maintain sealing effectiveness for a long time, and also buffer vibration and reduce noise.

[0021] Optionally, an inspection window is provided on the side wall of the bottom box corresponding to the height range of the water collection and drainage chamber. A detachable rodent-proof mesh assembly is installed at the inspection window. The rodent-proof mesh assembly includes a frame and a rodent-proof mesh fixedly covered within the frame.

[0022] By adopting the above technical solutions, visualized inspection is achieved. Maintenance personnel can observe the water accumulation, debris buildup, and one-way drain valve status in the water collection and drainage chamber through the rodent-proof mesh without disassembling components. Physical isolation of rodents is achieved, as the mesh size of the rodent-proof mesh prevents rodents from entering, forming a double defense with the drain outlet and improving the rodent-proof level of the bottom box. Convenient cleaning and maintenance are also achieved. The rodent-proof mesh component is detachable, allowing maintenance personnel to quickly remove it to clean debris, inspect or replace the one-way drain valve. The maintenance process does not require power outages or disassembly of the upper bottom plate, resulting in high maintenance efficiency and safe operation.

[0023] Optionally, the upper area of ​​the side wall of the base box is provided with multiple cable entry and exit holes. Each cable entry and exit hole is equipped with a cable sealing assembly, which is used to wrap the outer surface of the cable passing through the cable entry and exit hole and achieve a sealed contact with the hole wall.

[0024] By adopting the above technical solution, the cable sealing assembly forms the first line of defense at the cable inlet and outlet, effectively preventing external moisture, humid air and insects and rodents from entering the bottom box through the cable inlet and outlet under normal conditions, forming a coordinated protection with the internal double-layer drainage system.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The upper bottom plate divides the internal space of the bottom box into a cable installation area and a water collection and drainage area, which physically separates the cables from the water and prevents the cable joints from being soaked in water. 2. The inclined surface design of the lower base plate allows accumulated water to flow automatically to the drain under the action of gravity, achieving zero-energy consumption and maintenance-free automatic drainage; 3. The one-way drain valve uses an airbag structure to prevent external fluid from entering the bottom box in reverse, achieving one-way sealing protection of "only out, no in"; 4. Arched reinforcing ribs enhance the load-bearing capacity and bending stiffness of the upper base plate, and strengthen the lateral stiffness and torsional resistance of the bottom box frame; 5. The support plate suspends the cable, preventing it from coming into contact with water, ensuring smooth water flow, and improving cable heat dissipation; 6. Insect-proof netting prevents insects and other small organisms from entering the bottom tank, preventing drainage channel blockage and protecting the valve core; 7. The upper bottom plate is removable, making it easy to clean and maintain the water collection and drainage chamber; 8. The sealing strip forms an airtight and watertight interface, preventing water leakage and also adaptively compensating for thickness changes, buffering vibration and reducing noise; 9. The inspection window allows maintenance personnel to easily observe the water collection and drainage chamber, and the rodent-proof mesh component can effectively block rodents and is easy to clean and maintain; 10. The cable sealing assembly prevents external moisture and insects from entering the bottom box. Even if the seal fails, the seeping water can be directed into the water collection and drainage chamber for discharge. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is an exploded structural diagram of the present application, mainly showing the water collection and drainage cavity; Figure 3 This is an exploded structural diagram of this application, mainly showing the lower base plate; Figure 4 This is a cross-sectional structural diagram of the present application, mainly showing the one-way drain valve; Figure 5 yes Figure 4 A magnified view of part A in the diagram.

[0027] Explanation of reference numerals in the attached drawings: 1. Cabinet body; 2. Upper bottom plate; 3. Lower bottom plate; 4. Side wall of the bottom box; 5. One-way drain valve; 51. Valve body; 52. Insect screen; 53. Valve seat; 54. Valve core; 541. Air bladder; 542. Water passage hole; 6. Rodent screen assembly; 7. Water collection and drainage chamber; 8. Mounting flange; 9. Mounting lug; 10. Sealing strip; 11. Cable fixing hole; 12. Reinforcing rib; 13. Support plate; 14. Cable sealing assembly. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0029] A standardized AC metal-enclosed high-voltage switchgear, reference Figure 1 , Figure 2 The system includes a cabinet 1 and a self-draining, water-proof double-layer bottom box installed at the bottom of the cabinet 1, which is used to support the cabinet 1 of the ring main unit and its internal electrical components. The self-draining, water-proof double-layer bottom box includes an upper bottom plate 2, a lower bottom plate 3, bottom box side walls 4, a one-way drain valve 5, and a detachable rodent-proof mesh assembly 6. Through the coordinated operation of the above parts, the double-layer bottom box structure of this embodiment can achieve active collection of water in the bottom box, gravity diversion, one-way discharge, and isolation and protection against external insects and rodents under zero energy consumption conditions.

[0030] The bottom sidewall 4 encloses a rectangular frame structure with internal accommodating space. The top of this frame structure is used to connect to the ring main unit 1, and the bottom is used to fix it to the mounting foundation. The upper bottom plate 2 and the lower bottom plate 3 are arranged vertically at intervals and are both installed inside the bottom sidewall 4. The upper bottom plate 2 connects to the upper area of ​​the bottom sidewall 4, and the lower bottom plate 3 connects to the lower area of ​​the bottom sidewall 4. The upper surface of the upper bottom plate 2 abuts against the bottom plate of the unit 1. A water collection and drainage chamber 7 is formed between the upper bottom plate 2 and the lower bottom plate 3, which collects water falling from the upper bottom plate 2 and guides it to the drainage position. A one-way drain valve 5 is installed at the lowest position of the lower bottom plate 3 and is connected to the water collection and drainage chamber 7. A detachable rodent-proof mesh assembly 6 is installed on the sidewall 4 corresponding to the lateral opening of the water collection and drainage chamber 7.

[0031] refer to Figure 2 , Figure 3 The upper base plate 2 is a flat plate with a predetermined thickness, and its planar outline matches the internal cross-sectional shape enclosed by the side wall 4 of the base box. In this embodiment, the upper base plate 2 is rectangular. Mounting flanges 8 are provided at the four edges of the upper base plate 2, formed by bending the periphery of the upper base plate 2. Multiple through holes for connecting parts are provided on the mounting flanges 8. Correspondingly, multiple mounting ears 9 are welded and fixed at a predetermined height on the side of the side wall 4 of the base box. The mounting ears 9 also have through holes. In the assembled state, the mounting flanges 8 of the upper base plate 2 and the mounting ears 9 on the side wall 4 are fitted together and fastened by threaded fasteners such as bolts inserted into the through holes of both, thereby reliably fixing the upper base plate 2 to the side wall 4 of the base box.

[0032] A sealing strip 10 made of elastic sealing material is also sandwiched between the mounting flange 8 and the mounting ear 9, or between the mounting flange 8 and the inner side of the bottom box side wall 4. The sealing strip 10 extends continuously along the circumference of the upper bottom plate 2 and undergoes elastic deformation after being tightened by bolts, thereby filling the tiny gaps at the connection interface and preventing water from leaking from the connection to areas other than the water collection and drainage chamber 7 below.

[0033] Multiple drainage holes are provided on the surface of the upper base plate 2. These drainage holes are arranged in an array on the surface of the upper base plate 2, and their distribution area basically covers the entire effective load-bearing plane of the upper base plate 2 except for the area where the edge mounting flange 8 is located. Each drainage hole is a through hole that penetrates the thickness of the upper base plate 2, and its opening shape can be circular, square, or other geometric shapes. The function of the drainage holes is to allow water to accumulate on the upper surface of the upper base plate 2, so that the water can flow directly into the water collection and drainage chamber 7 below under the action of gravity through the nearest drainage hole, thus preventing water from stagnating on the upper surface of the upper base plate 2.

[0034] Multiple cable fixing holes 11 are provided on the surface of the upper base plate 2. These holes are threaded or through holes, used to install cable clamps, cable brackets, and other cable fixing accessories to orderly secure the cables entering the bottom box to the upper base plate 2. The distribution of the cable fixing holes 11 is staggered from the distribution of the drainage holes to ensure that the two functions do not interfere with each other. Multiple reinforcing ribs 12 are welded and fixed to the inner wall of the bottom box. These ribs 12 are arched, with their central portion protruding towards the bottom surface of the upper base plate and abutting against the surface of the upper base plate 2 to provide support. Support plates 13 are fixedly connected to the reinforcing ribs 12. The support plates 13 support the cables extending into the water collection and drainage chamber 7, allowing the cables to be suspended between the cables and the lower base plate 3, preventing the cables from being submerged in water.

[0035] The lower base plate 3 is also a plate-shaped component with a preset thickness, and its outer contour shape matches the inner cross-sectional shape of the lower part of the bottom tank side wall 4. The four edges of the lower base plate 3 are fixed and sealed to the inner wall surface of the bottom tank side wall 4 by continuous welding, so that the lower base plate 3 and the lower part of the bottom tank side wall 4 together form an upward-opening and bottom-impermeable water collection container.

[0036] The upper surface of the lower base plate 3 is constructed as an inclined surface relative to the horizontal plane. The inclination direction of this inclined surface is defined, gradually decreasing towards the side of the bottom tank side wall 4 where the one-way drain valve 5 is to be installed. The lower base plate 3 has a higher height on the side away from the installation position of the one-way drain valve 5, and a lower height on the side closer to the installation position of the one-way drain valve 5. This inclined configuration allows water falling on the upper surface of the lower base plate 3 to spontaneously flow towards the lower side and converge under the influence of its own gravity along the inclined plane component.

[0037] At the lowest point of the inclined surface of the lower base plate 3, a drain outlet penetrating the plate is provided. This drain outlet is used to install a one-way drain valve 5. The edge area of ​​the drain outlet is recessed downward to form a stepped surface. The size and shape of this stepped surface are adapted to the mounting mating part of the one-way drain valve 5 to facilitate the positioning and sealing installation of the one-way drain valve 5.

[0038] refer to Figure 3 , Figure 4 , Figure 5 The one-way drain valve 5, as an integral component, is installed at the drain outlet of the lower base plate 3 to control the one-way outflow of water accumulated in the water collection and drainage chamber 7. The one-way drain valve 5 includes a valve body 51, which is a hollow tubular structure with a stepped shape and an internal through-flow water channel. Its outer surface is fixedly connected to the lower base plate 3 by screws. The valve body 51 is mounted on the stepped surface, and the contact surface between the valve body 51 and the stepped surface is coated with sealant to achieve a watertight connection between the valve body 51 and the lower base plate 3. The lower end of the valve body 51 penetrates the side wall 4 of the bottom tank, so that the outlet of the valve body 51 is located outside the bottom tank.

[0039] The inlet of valve body 51 is flush with the surface of the lower bottom plate 3, and its outlet is located below the inlet. There is a height difference between the two, so that water can flow to the outlet by its own weight after entering valve body 51 through the inlet.

[0040] Insect-proof nets 52 are fixed at both the outlet and inlet of the valve body 51. The insect-proof nets 52 cover the outlet and inlet of the valve body 51. The mesh size of the insect-proof nets 52 is large enough to allow water to flow smoothly, but it can prevent insects and other small organisms from crawling back into the bottom box through the drainage channel. It also allows water to flow smoothly from the lower bottom plate 3 into the inlet of the valve body 51 and out of the outlet of the valve body 51.

[0041] A valve seat 53 is integrally formed in the middle of the valve body 51. A valve core 54 is fixed to the valve seat 53 by screws, and the valve core 54 is installed on the side of the valve seat 53 near the outlet. The valve core 54 is made of a flexible and elastic material, such as silicone. An air bladder 541 is integrally formed in the center of the valve core 54. The air bladder 541 protrudes from the upper and lower surfaces of the valve core 54, and there is a water flow gap between the outer surface of the air bladder 541 and the valve seat 53. A water passage hole 542 is opened at the edge of the air bladder 541 in the valve core 54. Water from the inlet of the valve body 51 can be discharged from the outlet of the valve body 51 through the water passage hole 542. When the lower bottom plate 3 drains, the water can enter the valve core 54 and flow along the surface of the air bladder 541 to the water passage hole 542, and then flow out from the drain outlet, thus forming a drainage channel. When external water flows in from the drain outlet, the water flow below can push the valve core 54 air bladder 541 to float upward until the water passage 542 abuts against the surface of the valve seat 53 and the valve seat 53 squeezes the air bladder 541, thereby completely isolating the water inlet and drain outlet of the valve body 51.

[0042] refer to Figure 2 , Figure 3 A maintenance window is provided on the side wall 4 of the base tank, corresponding to the height range of the water collection and drainage chamber 7. This maintenance window is an opening penetrating the wall thickness of the side wall 4, and its size and shape should facilitate maintenance personnel to observe the water accumulation on the lower base plate 3 or perform simple cleaning operations. A removable rodent-proof mesh assembly 6 is installed at the maintenance window. The rodent-proof mesh assembly 6 includes a frame adapted to the outline of the maintenance window, which can be made of bent metal sheets or spliced ​​profiles. A layer of rodent-proof mesh, woven from metal wire, is fixedly covered inside the frame. The mesh size is designed to effectively prevent rodents from entering while maintaining good ventilation and visibility.

[0043] The side wall 4 of the base box has multiple cable inlet and outlet holes. Each cable inlet and outlet hole is equipped with a cable sealing assembly 14. The cable sealing assembly 14 can be a tower-shaped rubber sealing ring, a fireproof sealing putty filling structure, or other forms of variable diameter sealing device. The cable sealing assembly 14 tightly wraps around the outer surface of the cable passing through the hole and achieves a sealing contact with the hole wall, thereby preventing external moisture and insects from entering the interior of the base box under normal conditions.

[0044] The implementation principle of this embodiment is as follows: This embodiment achieves zero-energy automatic discharge of water accumulated in the bottom tank by combining double-layer space isolation with gravity self-guiding.

[0045] When external moisture enters the bottom chamber through weak points in the cable inlet / outlet sealing assembly, gaps in the cabinet 1 connection, or condensation of moisture in the foundation, the moisture first falls onto the upper surface of the upper base plate 2. Because the upper base plate 2 is equipped with an array of drainage holes covering its surface, regardless of the direction from which moisture enters, it will fall vertically into the lower water collection and drainage chamber 7 under the influence of gravity, preventing water accumulation on the upper surface of the upper base plate 2. During this process, cable connectors and cable fixing accessories are all installed on the upper surface of the upper base plate 2, away from water accumulation channels, fundamentally avoiding the risk of water immersion.

[0046] After entering the water collection and drainage chamber 7, the water falls onto the upper surface of the lower base plate 3. Because the upper surface of the lower base plate 3 is constructed as an inclined surface, the water, driven by the component of gravity along the inclined surface, spontaneously flows towards the drain outlet at the lowest point of the inclined surface and converges. Even if the water volume is small, the surface tension of the water is insufficient to prevent its directional flow on the inclined surface.

[0047] As water accumulates, the water level at the drain outlet gradually rises, applying water pressure to the inside of the valve core 54 of the one-way drain valve 5. Under the action of water pressure, water enters the water flow channel inside the valve body 51 through the inlet, and flows through the water passage 542 on the valve core 54 to the outlet of the valve body 51, and is finally discharged outside the bottom box.

[0048] When there is reverse water pressure outside the bottom tank (such as backflow of external water), the reverse fluid enters the water flow channel from the outlet of valve body 51, exerting a thrust on the air bladder 541 on valve core 54. Under the action of the reverse fluid, air bladder 541 moves towards valve seat 53, causing the surface of air bladder 541 to fit tightly against the sealing surface of valve seat 53. The water passage hole 542 is blocked by valve seat 53, and the water flow channel is completely blocked, thus achieving reverse sealing. In this state, external humid air, corrosive gases, and insects cannot enter the bottom tank through the drainage channel.

[0049] Meanwhile, the arched reinforcing ribs 12 welded and fixed inside the water collection and drainage cavity 7 provide support for the upper base plate 2, enhancing its load-bearing capacity and preventing deformation due to the weight of the cabinet 1 and cables. The support plates 13 fixedly connected to the reinforcing ribs 12 support the cables extending into the water collection and drainage cavity 7, keeping the cables suspended relative to the upper surface of the lower base plate 3. Even if temporary water accumulates in the water collection and drainage cavity 7, the cables will not come into contact with the water.

[0050] The removable rodent-proof mesh assembly 6 on the side wall 4 of the base box ensures ventilation and visibility of the drainage channel while effectively preventing rodents and other organisms from entering the base box through the maintenance window. The insect-proof mesh 52 at the inlet and outlet of the one-way drain valve 5 further prevents the intrusion of insects and other small organisms. The cable sealing assembly 14 at the cable inlet and outlet forms the first physical barrier against external moisture and rodents.

[0051] Through the coordinated operation of the above structures, this embodiment achieves zero-energy treatment of the entire process of "passive collection - gravity diversion - unidirectional discharge - reverse isolation - harmful organism protection" for water accumulation in the bottom tank, effectively eliminating the safety hazards of water accumulation at the bottom of the ring main unit.

[0052] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A standardized AC metal-enclosed high-voltage switchgear, comprising a cabinet (1), wherein a base box is installed at the bottom of the cabinet (1), characterized in that, The bottom box includes: The bottom box side wall (4) encloses and forms a frame structure with an internal storage space, and the top of the bottom box side wall (4) is used to connect with the cabinet (1); The upper bottom plate (2) is installed on the upper inner side of the side wall (4) of the bottom box. Multiple drainage holes are provided on the surface of the upper bottom plate (2), and the drainage holes penetrate the thickness of the upper bottom plate (2). The lower bottom plate (3) is installed in the lower inner area of ​​the side wall (4) of the bottom box. A water collection and drainage cavity (7) is formed between the upper bottom plate (2) and the lower bottom plate (3). The upper surface of the lower bottom plate (3) is constructed as an inclined surface. The inclined surface gradually decreases in a predetermined direction. A drain outlet is provided at the lowest position of the inclined surface. A one-way drain valve (5) is installed at the drain outlet. The one-way drain valve (5) includes a valve body (51), a valve core (54), and a sealing structure. A water flow channel is formed inside the valve body (51), and the valve core (54) is disposed in the water flow channel. The one-way drain valve (5) is configured to allow water in the water collection and drainage chamber (7) to be discharged to the outside of the bottom tank through the water flow channel of the valve body (51), and to prevent external fluid from entering the water collection and drainage chamber (7) in reverse through the water flow channel. The valve core (54) includes an air bladder (541) having a deformable surface, and a water passage hole (542) is provided on the valve core (54); the one-way drain valve (5) is further configured such that when external fluid enters the water flow channel in the opposite direction, the air bladder (541) is displaced and / or deformed under the action of the reverse fluid, so that the water passage hole (542) abuts against the sealing surface on the valve body (51) to block the water flow channel.

2. The standardized AC metal-enclosed high-voltage switchgear according to claim 1, characterized in that, A reinforcing rib (12) is welded and fixed on the inner side of the bottom box side wall (4). The reinforcing rib (12) is arched, and the middle part of the reinforcing rib (12) protrudes towards the lower plate surface of the upper bottom plate (2) and abuts against the plate surface of the upper bottom plate (2).

3. The standardized AC metal-enclosed high-voltage switchgear according to claim 2, characterized in that, A support plate (13) is fixedly connected to the reinforcing rib (12). The support plate (13) is used to support the cable extending into the water collection and drainage cavity (7) so that the cable is suspended relative to the upper surface of the lower bottom plate (3).

4. The standardized AC metal-enclosed high-voltage switchgear according to claim 1, characterized in that, The airbag (541) is integrally formed in the central region of the valve core (54), the airbag (541) protrudes from at least one side surface of the valve core (54), and the water passage (542) is opened in the edge region of the airbag (541).

5. The standardized AC metal-enclosed high-voltage switchgear according to claim 4, characterized in that, The valve body (51) is provided with a valve seat (53) inside, and the valve core (54) is installed on the side of the valve seat (53) near the outlet of the valve body (51); when the external fluid enters in the opposite direction, the air bag (541) is displaced towards the valve seat (53) under the action of the reverse fluid until the water passage (542) abuts against the surface of the valve seat (53).

6. The standardized AC metal-enclosed high-voltage switchgear according to claim 1, characterized in that, Insect-proof nets (52) are fixedly installed at the inlet and outlet of the valve body (51), and the insect-proof nets (52) cover the inlet and outlet.

7. The standardized AC metal-enclosed high-voltage switchgear according to claim 1, characterized in that, The upper base plate (2) is provided with mounting flanges (8) at its four edges, and mounting ears (9) are welded and fixed on the inner side of the bottom box side wall (4). The mounting flanges (8) and mounting ears (9) are fitted together and fastened by threaded connectors.

8. The standardized AC metal-enclosed high-voltage switchgear according to claim 7, characterized in that, A sealing strip (10) made of elastic sealing material is sandwiched between the mounting flange (8) and the mounting lug (9), and the sealing strip (10) extends continuously along the circumference of the upper base plate (2).

9. The standardized AC metal-enclosed high-voltage switchgear according to claim 1, characterized in that, The bottom box side wall (4) has an inspection window on the wall surface corresponding to the height range of the water collection and drainage cavity (7). A detachable rodent-proof net assembly (6) is installed at the inspection window. The rodent-proof net assembly (6) includes a frame and a rodent-proof net fixedly covering the frame.

10. The standardized AC metal-enclosed high-voltage switchgear according to claim 9, characterized in that, The upper part of the side wall (4) of the bottom box is also provided with multiple cable inlet and outlet holes. Each cable inlet and outlet hole is equipped with a cable sealing assembly (14). The cable sealing assembly (14) is used to wrap the outer surface of the cable passing through the cable inlet and outlet hole and achieve a sealed contact with the hole wall.

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