24 kv gas insulation environment-friendly cabinet

Abstract

The invention discloses a 24kv gas insulation environment-friendly cabinet which comprises a cabinet body, a mechanism compartment, a switch gas chamber and a cable compartment, wherein the mechanism compartment, the switch gas chamber and the cable compartment are arranged in the cabinet body. The switch air chamber takes dry air instead of SF6 as an insulating medium, and a main circuit assembly and a pressure adjusting mechanism are arranged in the switch air chamber. According to the mechanism, the upper space and the lower space are separated through the fixed partition plate, the nested structure of the lower barrel cover, the middle barrel cover and the upper barrel cover is matched with the first spring and the second spring to achieve multi-stage pressure buffering, and gas is automatically discharged to the lower space to form two-stage protection during overpressure. In a drying mode, a first motor drives a gear set to suck bottom moisture, and after the bottom moisture is dehumidified through a molecular sieve, a second motor controls a T-shaped partition plate to switch a passage so that dry gas can return to the gas chamber; heating the molecular sieve in the regeneration mode and switching passages to discharge water vapor. The SF6 greenhouse effect is thoroughly eliminated, and the environmental protection property, the operation stability and the maintenance-free property are remarkably improved through pressure self-adaptive adjustment and a full-automatic drying regeneration system.

Description

Technical Field

[0001] This invention relates to the field of environmental protection cabinet technology, specifically a 24kV gas-insulated environmental protection cabinet. Background Technology

[0002] With the continuous development of society and economy and the gradual improvement of people's living standards, the demand for electricity in the whole society has become increasingly large. As a result, the problem of power loss in power supply lines has become increasingly difficult and prominent, and has attracted more and more attention and importance.

[0003] Currently, Chinese patent application number CN201820234823.4 discloses a 24kV fully insulated and fully sealed SF6 ring main unit, which includes: a cabinet, which is insulated and closed on all four sides, and the cabinet is sealed with inert gas SF6; multiple 24kV load switches, which are arranged side by side at equal intervals inside the cabinet; branch busbars, which are connected to the multiple 24kV load switches, and the ends of the multiple branch busbars are combined to form a main busbar; cable sleeves, which are installed on the cabinet, with one end of the cable sleeve connected to the main busbar and the other end connected to an external cable; an operating mechanism, which is installed on the surface of the cabinet and connected to the 24kV load switches to perform external control functions; and an expansion connector, which is connected to the 24kV load switches for connecting to external loads.

[0004] However, existing environmental protection cabinets generally use SF6 gas as the insulating medium, but its greenhouse effect potential is extremely high, posing a significant environmental hazard. Furthermore, when using alternative gases such as dry air, the low insulation strength of air necessitates continuous dehumidification to maintain dielectric properties, resulting in frequent maintenance and high energy consumption in traditional drying solutions. Moreover, the pressure changes in the gas chamber caused by switching operations and temperature fluctuations are prone to sudden changes, and the single-stage pressure relief device has insufficient response accuracy, which can easily lead to sealing failure or mechanical damage, resulting in poor operational reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a 24kV gas-insulated environmental protection cabinet to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a 24kV gas-insulated environmentally friendly cabinet, comprising a cabinet body, a mechanism compartment, a switch gas compartment, a cable compartment, a 24kV extension bushing, a 24kV circuit breaker switch, a 24kV outgoing bushing, a pressure regulating mechanism, and a self-drying circulation mechanism. The cable compartment is located on the bottom side of the cabinet body. The mechanism compartment and the switch gas compartment are arranged side-by-side on the upper side of the cabinet body, and the bottoms of both the mechanism compartment and the switch gas compartment are connected to the cable compartment. The switch gas compartment is filled with dry air as an insulating medium, and a 24kV extension bushing is arranged sequentially from top to bottom inside the switch gas compartment. The circuit includes a bushing, a 24kV circuit breaker switch, and a 24kV outgoing bushing. The 24kV extension bushing is installed through the top front side of the switch chamber. The bottom of the switch chamber has a stepped structure extending towards the cable compartment, and the 24kV outgoing bushing is installed through this stepped structure into the cable compartment. A pressure regulating mechanism is provided on the lower middle side of the switch chamber to divide the switch chamber into upper and lower spaces. The 24kV outgoing bushing is installed through the pressure regulating mechanism. A self-drying circulation mechanism is installed through the top side of the switch chamber, and the air inlet of the self-drying circulation mechanism is located on the bottom side of the switch chamber.

[0007] Preferably, a 24kV circuit breaker mechanism and a 24kV isolation mechanism are respectively provided on the upper and lower sides of the compartment. The 24kV circuit breaker mechanism and the 24kV isolation mechanism are mechanically independent and control the 24kV circuit breaker switch and the isolating switch in the switch chamber respectively.

[0008] Preferably, a pressure gauge is installed on the side of the cabinet, and the pressure gauge is connected to the inside of the switch air chamber through a pipeline to monitor the dry air pressure value in real time.

[0009] Preferably, the pressure regulating mechanism includes a partition fixed to the lower center of the switch chamber. A circular opening is provided on the front side of the partition. A lower cylinder cover is fixedly connected to the upper center of the partition. A first spring is provided inside the lower cylinder cover near the inner wall. A middle cylinder cover is connected to the top of the first spring, and the bottom outer side of the middle cylinder cover is slidably connected to the inner wall of the lower cylinder cover. A second spring is provided inside the middle cylinder cover near the inner wall. An upper cylinder cover is connected to the top of the second spring, and the bottom outer side of the upper cylinder cover is slidably connected to the inner wall of the middle cylinder cover. A pressure regulating structure is embedded in the top side of the upper cylinder cover.

[0010] Preferably, the inner middle side of the lower cylinder cover is hollow, and the position of the inner middle side of the lower cylinder cover corresponds to the position of the circular opening of the partition.

[0011] Preferably, the pressure regulating structure includes a cover seat embedded in the middle of the upper cylinder cover and having a round opening at the top, a pad fixed to the bottom of the cover seat, a sliding column that slides through the middle of the pad, a sealing head disposed at the top of the sliding column, and a compression spring connected to the bottom of the sealing head. The pad is hollow inside, a sealing ring is disposed in the middle of the outer surface of the sealing head, and the bottom of the compression spring is connected to the pad.

[0012] Preferably, the self-drying circulation mechanism includes a rectangular base fixed through the top of the switch air chamber, a door hinged to the lower right side of the front part of the rectangular base, an air inlet pipe connected to the bottom right side of the door, an air inlet valve connected to the bottom end of the air inlet pipe, a mesh seat locked and fixed inside the right side of the rectangular base, a molecular sieve filled inside the mesh seat, a reversing structure connected to the middle left side of the mesh seat, an exhaust valve installed on the top left side of the reversing structure, and an air supply valve fastened to the bottom of the reversing structure. The air inlet valve is disposed through the bottom side of the switch air chamber, the reversing structure is disposed inside the left side of the rectangular base, and the exhaust valve is located above the switch air chamber.

[0013] Preferably, the rear part of the mesh base is provided with an electric heating element for heating the molecular sieve, the right air inlet of the mesh base is connected to the air inlet pipe, and the left air outlet of the mesh base is connected to the reversing structure.

[0014] Preferably, the reversing structure includes a rectangular compartment fixed to the left side inside the rectangular base, a first motor locked and fixed to the upper rear part of the rectangular compartment, a first gear connected to the front output shaft of the first motor, a second gear meshing with the bottom side of the first gear, a horizontal tube passing through and fixed to the middle left side of the rectangular compartment, a disc base welded and fixed to the left end of the horizontal tube, a second motor locked and fixed to the middle rear part of the disc base, a T-shaped partition connected to the front output shaft of the second motor, and a first air outlet pipe and a second air outlet pipe respectively fixedly connected to the upper and lower sides of the disc base. The first gear and the second gear are rotatably connected to the upper and lower sides inside the rectangular compartment, the T-shaped partition is rotatably connected to the inside of the disc base, the left end of the first air outlet pipe is connected to an exhaust valve, and the bottom end of the second air outlet pipe is connected to an air supply valve.

[0015] Preferably, the angle between the horizontal tube and the first and second air outlets is 90 degrees, and sealing strips are provided at the three ends of the T-shaped partition, with the sealing strips in contact with the inner wall of the disc seat.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention fundamentally eliminates the risk of greenhouse gas emissions by using dry air to completely replace traditional SF6 gas as the insulating medium for the switch chamber, significantly reducing the environmental impact throughout the equipment's life cycle. At the same time, by combining a self-drying circulation mechanism with molecular sieve adsorption of moisture and thermal regeneration technology, it effectively maintains the long-term insulation strength of the dry air in the chamber, ensuring the electrical reliability of the environmentally friendly insulating medium.

[0017] The pressure regulating mechanism of this invention achieves precise absorption and compensation of pressure fluctuations inside the switching chamber through multi-stage spring buffering and a retractable cavity structure. The graded regulation mechanism can smoothly cope with instantaneous gas pressure shocks caused by temperature changes or switching operations, significantly reducing mechanical stress damage to key components. The pressure regulating structure integrated at the top serves as the last line of defense for overpressure protection, automatically releasing high-pressure gas to the lower buffer space of the chamber in case of abnormal pressure, avoiding structural damage to the equipment, and forming a two-level pressure safety guarantee.

[0018] The self-drying circulation mechanism of this invention achieves fully automatic switching between drying and regeneration modes through a motor-driven reversing structure. In drying mode, the motor-driven gear set forces convection to efficiently extract high-humidity gas from the bottom of the switching chamber for deep dehumidification. In regeneration mode, the heating element heats the molecular sieve and, in conjunction with directional airflow, discharges water vapor, restoring the desiccant's activity without manual intervention. This closed-loop system can continuously maintain the dryness of the gas inside the switching chamber, significantly extending the maintenance cycle. At the same time, the modularly designed mesh base and openable / closable door facilitate quick replacement of the molecular sieve, further reducing the complexity and cost of later operation and maintenance. Attached Figure Description

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the pressure regulating mechanism of the present invention; Figure 3 This is a schematic diagram of the voltage regulating structure of the present invention; Figure 4 This is a schematic diagram of the self-drying circulation mechanism of the present invention; Figure 5 This is a schematic diagram of the internal structure of the rectangular base of the present invention.

[0020] In the diagram: Cabinet-1, Mechanism compartment-2, Switch chamber-3, Cable compartment-4, 24kV extension bushing-5, 24kV circuit breaker switch-6, 24kV outgoing bushing-7, Pressure regulating mechanism-8, Self-drying circulation mechanism-9, 24kV circuit breaker mechanism-10, 24kV isolation mechanism-11, Pressure gauge-12, Partition plate-81, Lower cylinder cover-82, First spring-83, Middle cylinder cover-84, Second spring-85, Upper cylinder cover-86, Pressure regulating structure-87, Cover base-871, Pad block-87 2. Sliding column - 873, Sealing head - 874, Compression spring - 875, Rectangular seat - 91, Chamber door - 92, Air inlet pipe - 93, Air inlet valve - 94, Mesh seat - 95, Molecular sieve - 96, Reversing structure - 97, Exhaust valve - 98, Gas delivery valve - 99, Rectangular chamber - 971, First motor - 972, First gear - 973, Second gear - 974, Horizontal tube - 975, Disc seat - 976, Second motor - 977, T-shaped partition - 978, First exhaust pipe - 979, Second exhaust pipe - 9710. Detailed Implementation

[0021] To further explain the technical solution of the present invention, a detailed description is provided below through specific embodiments.

[0022] Please see Figure 1This invention provides a 24kV gas-insulated environmentally friendly cabinet, comprising a cabinet body 1, a mechanism compartment 2, a switch gas chamber 3, a cable compartment 4, a 24kV expansion bushing 5, a 24kV circuit breaker switch 6, a 24kV outgoing bushing 7, a pressure regulating mechanism 8, and a self-drying circulation mechanism 9. The cable compartment 4 is located on the bottom side of the cabinet body 1, providing a dedicated and safe space for cable connections and incoming / outgoing lines. The mechanism compartment 2 and the switch gas chamber 3 are arranged side-by-side on the upper side of the cabinet body 1, and their bottoms are connected to the cable compartment 4. The switch gas chamber 3 is filled with dry air as the insulating medium, using environmentally friendly gas instead of SF6, significantly reducing environmental impact and meeting environmental protection requirements. The 24kV expansion bushing 5, the 24kV circuit breaker switch 6, and the 24kV outgoing bushing 7 are arranged sequentially from top to bottom inside the switch gas chamber 3, forming a clear and compact main circuit path, ensuring reliable connection and disconnection of high-voltage electrical components. The 24kV expansion bushing 5 is installed through the cabinet body. The switch chamber 3 is located at the top front and provides a high-voltage busbar access port for easy connection and expansion with other cabinets or equipment. The bottom of the switch chamber 3 has a stepped structure extending to the cable compartment 4, and the 24kV outgoing bushing 7 is installed through the stepped structure into the cable compartment 4 to achieve a safe and reliable connection between the main circuit in the switch chamber 3 and the cable in the cable compartment 4. The switch chamber 3 is equipped with a pressure regulating mechanism 8 in the lower middle part to divide the interior of the switch chamber 3 into upper and lower spaces to establish a pressure buffer area, which facilitates independent adjustment of the pressure in key areas and enhances stability. The 24kV outgoing bushing 7 is installed through the pressure regulating mechanism 8 to ensure the sealing and insulation reliability of the main circuit conductor when it passes through the pressure regulating area. The switch chamber 3 is equipped with a self-drying circulation mechanism 9 through the top side, and the air inlet of the self-drying circulation mechanism 9 is located at the bottom side of the switch chamber 3 to establish a gas circulation drying path, drawing in heavy humid gas from the bottom for drying. The internal compartment 2 is equipped with a 24kV circuit breaker mechanism 10 and a 24kV isolation mechanism 11 on its upper and lower sides, respectively. The 24kV circuit breaker mechanism 10 and the 24kV isolation mechanism 11 are mechanically independent and control the 24kV circuit breaker switch 6 and the isolating switch in the switch chamber 3, respectively. This enables independent control of opening / closing operations and isolation operations, improving operational flexibility and safety. A pressure gauge 12 is installed on the side of the cabinet 1. The pressure gauge 12 is connected to the inside of the switch chamber 3 through a pipeline to monitor the dry air pressure value in real time. This ensures that the operator can keep track of the pressure status of the insulating gas in the switch chamber 3 at any time, guaranteeing insulation performance and safe operation of the equipment.

[0023] Please see Figure 1 , Figure 2 and Figure 3This invention provides a 24kV gas-insulated environmental protection cabinet. The pressure regulating mechanism 8 includes a partition 81 fixed in the lower middle part of the switch chamber 3, which forms the basic support for pressure regulation and the separation of the upper and lower spaces. A circular opening is provided on the front side of the partition 81. A lower cylinder cover 82 is fixedly connected to the upper middle side of the partition 81, forming the basic outer cover of the pressure regulating cavity. A first spring 83 is provided near the inner wall of the lower cylinder cover 82. A middle cylinder cover 84 is connected to the top side of the first spring 83, and the bottom outer side of the middle cylinder cover 84 is slidably connected to the inner wall of the lower cylinder cover 82. The first spring 83 provides primary pressure buffering and reset capability, allowing the middle cylinder cover 84 to slide. The upper cylinder cover 86 slides up and down when the pressure changes, thus changing the volume. A second spring 85 is provided inside the middle cylinder cover 84 near the inner wall to provide secondary pressure buffering and reset capability, enabling multi-level adjustment. The top side of the second spring 85 is connected to the upper cylinder cover 86, and the bottom outer side of the upper cylinder cover 86 is slidably connected to the inner wall of the middle cylinder cover 84, allowing the upper cylinder cover 86 to slide up and down when the pressure changes, further realizing the volume change. A pressure regulating structure 87 is embedded in the top side of the upper cylinder cover 86. The middle side of the lower cylinder cover 82 is hollow, and the middle side of the lower cylinder cover 82 corresponds to the circular opening of the partition 81. The pressure regulating structure 87 achieves the final pressure relief and sealing function.

[0024] The pressure regulating structure 87 includes a cover seat 871 embedded in the middle of the upper cylinder cover 86 and having a round opening at the top, a pad 872 fixed to the bottom of the cover seat 871, a sliding column 873 that slides through the middle of the pad 872, a sealing head 874 located at the top of the sliding column 873, and a compression spring 875 connected to the bottom of the sealing head 874. The compression spring 875 sets the pressure relief threshold. The pad 872 is hollow inside. A sealing ring is provided in the middle of the outer surface of the sealing head 874. The bottom of the compression spring 875 is connected to the pad 872. The cover seat 871 provides a mounting base and a pressure relief channel. Under normal pressure, the sealing head 874 contacts and seals with the round opening of the cover seat 871. When there is overpressure, the pressure relief is opened.

[0025] Please see Figure 1 , Figure 4 and Figure 5This invention provides a 24kV gas-insulated environmental protection cabinet. The self-drying circulation mechanism 9 includes a rectangular base 91 fixed to the top of the switch chamber 3, a door 92 hinged to the lower right side of the front of the rectangular base 91, an air inlet pipe 93 connected to the bottom right side of the door 92, an air inlet valve 94 connected to the bottom end of the air inlet pipe 93, a mesh seat 95 locked and fixed inside the rectangular base 91 on the right side, a molecular sieve 96 filled inside the mesh seat 95 for adsorbing moisture in the gas, the ability to maintain or replace the molecular sieve 96 by opening the door 92, a reversing structure 97 connected to the middle left side of the mesh seat 95, an exhaust valve 98 installed on the top left side of the reversing structure 97 for discharging water vapor, and a fastener... The bottom of the reversing structure 97 has a gas supply valve 99 for transporting the dried gas back to the switching gas chamber 3. The inlet valve 94 is installed inside the bottom side of the switching gas chamber 3. The reversing structure 97 is located inside the rectangular base 91 on the left side for reasonable layout, connecting the drying, exhaust and return functions. The exhaust valve 98 is located above the switching gas chamber 3 to facilitate the discharge of moisture from the cabinet 1. The rear of the mesh base 95 is equipped with an electric heating element for heating the molecular sieve 96 to provide heat energy for regenerating the molecular sieve and restoring its drying capacity. The right air inlet of the mesh base 95 is connected to the air inlet pipe 93, and the left air outlet of the mesh base 95 is connected to the reversing structure 97 to ensure that the dried gas or regenerated waste gas is selectively discharged.

[0026] The reversing structure 97 includes a rectangular compartment 971 fixed to the left side inside the rectangular base 91, a first motor 972 locked and fixed to the upper rear part of the rectangular compartment 971, a first gear 973 connected to the front output shaft of the first motor 972, and a second gear 974 meshing with the bottom side of the first gear 973. The first motor 972 serves as the power source, driving the first gear 973 and the second gear 974 to mesh and drive the airflow. The airflow passes through a horizontal pipe 975 fixed to the middle left side of the rectangular compartment 971, a disc base 976 welded and fixed to the left end of the horizontal pipe 975, a second motor 977 locked and fixed to the middle rear part of the disc base 976, a T-shaped partition 978 connected to the front output shaft of the second motor 977, and a first air outlet pipe 979 and a second air outlet pipe 9710 respectively fixedly connected to the upper and lower sides of the disc base 976. The second motor 977 serves as the power source, causing the T-shaped partition 978 to move within the disc base. The internal rotation position of 976 changes the gas flow direction, switching between different gas flow paths. The first gear 973 and the second gear 974 are rotatably connected to the upper and lower sides of the rectangular chamber 971, respectively. The T-shaped partition 978 is rotatably connected to the inside of the disc seat 976. The left end of the first exhaust pipe 979 is connected to the exhaust valve 98 to guide the gas to be discharged to the exhaust valve 98. The bottom end of the second exhaust pipe 9710 is connected to the gas supply valve 99 to guide the dried gas to the gas supply valve 99 to return to the switch gas chamber 3. The angle between the horizontal pipe 975 and the first exhaust pipe 979 and the second exhaust pipe 9710 is 90 degrees, optimizing the spatial layout, facilitating pipeline connection, and cooperating with the T-shaped partition 978 to realize flow path switching. Sealing strips are provided at the three ends of the T-shaped partition 978, and the sealing strips are in contact with the inner wall of the disc seat 976 to ensure airtightness in different working modes and prevent gas cross-flow or leakage.

[0027] The working principle of the 24kV gas-insulated environmental protection cabinet of the present invention is as follows: First, environmentally friendly insulation and structural layout: Using dry air instead of traditional SF6 gas as the insulating medium for switch chamber 3 significantly reduces environmental impact and meets environmental protection requirements. Furthermore, the cabinet 1 employs a functional zoning design: inside switch chamber 3, from top to bottom, are arranged a 24kV extension bushing 5 for busbar expansion connections, a 24kV circuit breaker switch 6 for circuit opening and closing, and a 24kV outgoing bushing 7 connected to cable compartment 4. The mechanism compartment 2 has two independently installed upper and lower layers of a 24kV circuit breaker mechanism 10 and a 24kV isolation mechanism 11, which mechanically and independently control the circuit breaker switch 6 and the isolating switch within switch chamber 3, improving operational flexibility and safety. Additionally, a pressure gauge 12 is connected to switch chamber 3 via pipeline to monitor the dry air pressure in real time, ensuring equipment insulation performance and operational safety. Second, pressure buffering and graded regulation: To address pressure fluctuations inside the switching chamber 3 caused by temperature changes or operation, a pressure regulating mechanism 8 is installed on the lower side, dividing the switching chamber 3 into upper and lower spaces to establish a pressure buffer zone. When the air pressure in the upper space of the switching chamber 3 increases due to the electric arc, the gas pressure acts on the upper cylinder cover 86, overcoming the resistance of the first spring 83 and the second spring 85, and pushing the middle cylinder cover 84 and the upper cylinder cover 86 downward in sequence to increase the buffer cavity volume to absorb pressure. Conversely, when the pressure decreases, the restoring force of the spring pushes the cylinder cover upward to reduce the cavity volume to maintain pressure stability. The graded spring structure provides a more refined and smooth pressure regulation capability, effectively enhancing system stability. Third, overpressure relief protection: The pressure regulating structure 87 at the top of the pressure regulating mechanism 8 serves as the final safety line, responsible for relieving pressure when the pressure rises abnormally and exceeds the set threshold. When the pressure in the switch chamber 3 rises abnormally and the force acting on the sealing head 874 exceeds the set value of the compression spring 875, the sealing head is pushed upward and disengaged from the pressure relief port. At this time, the high-pressure gas is quickly discharged into the lower space of the switch chamber 3 through the hollow channel inside the pad block 872 and the open pressure relief port, protecting the equipment from overpressure damage. Once the pressure drops back to the safe range, the restoring force of the compression spring 875 causes the sealing head 874 to move upward again, closing the pressure relief port and restoring the sealing state. Fourth, self-drying cycle and regeneration: To ensure the long-term insulation performance of the dry air inside the switch chamber 3, a self-drying circulation mechanism 9 is installed at the top of the chamber, which has two working modes: drying and regeneration. In the drying mode, the inlet valve 94 is opened, and airflow is generated by the first motor 972 driving the first gear 973 and the second gear 974. The gas with higher moisture content at the bottom of the switch chamber 3 is drawn into the mesh seat 95 through the inlet pipe 93. The moisture in the gas is efficiently adsorbed by the molecular sieve 96. The dried gas enters the reversing structure 97 through the outlet on the left side of the mesh seat. At this time, driven by the second motor 977, the T-shaped partition 978 of the reversing structure 97 rotates to the position where the horizontal pipe 975 and the second outlet pipe 9710 are connected. The dried gas is then transported back to the switch chamber through the gas delivery valve 99. The drying cycle is completed at the top of the air-closing chamber 3. When the molecular sieve 96 is saturated with adsorbed moisture, it needs to be switched to the regeneration mode. At this time, the inlet valve 94 and the outlet valve 99 are closed, and the exhaust valve 98 is opened. The second motor 977 of the reversing structure 97 drives the T-shaped partition 978 to rotate to the position where the horizontal pipe 975 is connected to the first outlet pipe 979. At the same time, the electric heating element at the rear of the mesh base 95 is activated to heat the molecular sieve 96. Under the action of the airflow generated by the first gear 973 and the second gear 974, the heated molecular sieve 96 releases the adsorbed moisture, forming humid and hot exhaust gas. The exhaust gas is guided to the exhaust valve 98 after passing through the horizontal pipe 975 and the first outlet pipe 979, and is finally discharged outside the cabinet 1. After regeneration is completed, the system can automatically switch back to the drying mode.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A 24kV gas-insulated environmental protection cabinet, comprising a cabinet body (1), wherein a cable compartment (4) is provided on the bottom side of the cabinet body (1), and a mechanism compartment (2) and a switch gas compartment (3) are arranged side by side on the upper side of the cabinet body (1), and the bottom of both the mechanism compartment (2) and the switch gas compartment (3) are connected to the cable compartment (4), characterized in that: The switch chamber (3) is filled with dry air as an insulating medium. The switch chamber (3) is provided with a 24kV extension bushing (5), a 24kV circuit breaker switch (6) and a 24kV outgoing bushing (7) from top to bottom. The 24kV extension bushing (5) is installed through the top front side of the switch chamber (3). The bottom of the switch chamber (3) is provided with a stepped structure extending to the cable compartment (4). The 24kV outgoing bushing (7) is installed through the stepped structure to the inside of the cable compartment (4). The lower middle side of the switch chamber (3) is provided with a pressure regulating mechanism (8) to divide the inside of the switch chamber (3) into two spaces, the 24kV outgoing bushing (7) is installed through the pressure regulating mechanism (8). The top side of the switch chamber (3) is provided with a self-drying circulation mechanism (9). The air inlet of the self-drying circulation mechanism (9) is located on the bottom side of the switch chamber (3).

2. The 24kV gas-insulated environmental protection cabinet according to claim 1, characterized in that: The upper and lower sides of the compartment (2) of the mechanism are respectively provided with a 24kV circuit breaker mechanism (10) and a 24kV isolation mechanism (11). The 24kV circuit breaker mechanism (10) and the 24kV isolation mechanism (11) are mechanically independent and control the 24kV circuit breaker switch (6) and the isolation switch in the switch chamber (3) respectively.

3. The 24kV gas-insulated environmental protection cabinet according to claim 1, characterized in that: A pressure gauge (12) is installed on the side of the cabinet (1). The pressure gauge (12) is connected to the inside of the switch air chamber (3) through a pipeline to monitor the pressure value of dry air in real time.

4. The 24kV gas-insulated environmental protection cabinet according to claim 1, characterized in that: The pressure regulating mechanism (8) includes a partition (81) fixed in the lower middle part of the switch chamber (3). A circular opening is provided on the front side of the partition (81). A lower cylinder cover (82) is fixedly connected to the upper middle side of the partition (81). A first spring (83) is provided in the lower cylinder cover (82) near the inner wall. A middle cylinder cover (84) is connected to the top side of the first spring (83). The bottom outer side of the middle cylinder cover (84) is slidably connected to the inner wall of the lower cylinder cover (82). A second spring (85) is provided in the middle cylinder cover (84) near the inner wall. An upper cylinder cover (86) is connected to the top side of the second spring (85). The bottom outer side of the upper cylinder cover (86) is slidably connected to the inner wall of the middle cylinder cover (84). A pressure regulating structure (87) is embedded in the top side of the upper cylinder cover (86).

5. A 24kV gas-insulated environmental protection cabinet according to claim 4, characterized in that: The inner middle side of the lower cylinder cover (82) is hollow, and the inner middle side of the lower cylinder cover (82) corresponds to the position of the circular opening of the partition (81).

6. A 24kV gas-insulated environmental protection cabinet according to claim 4, characterized in that: The pressure regulating structure (87) includes a cover seat (871) embedded in the middle of the upper cylinder cover (86) and having a round opening at the top, a pad (872) fixed to the bottom of the cover seat (871), a sliding column (873) that slides through the middle of the pad (872), a sealing head (874) set at the top of the sliding column (873), and a compression spring (875) connected to the bottom of the sealing head (874). The pad (872) is hollow inside, and a sealing ring is provided in the middle of the outer surface of the sealing head (874). The bottom of the compression spring (875) is connected to the pad (872).

7. A 24kV gas-insulated environmental protection cabinet according to claim 1, characterized in that: The self-drying circulation mechanism (9) includes a rectangular seat (91) fixed through the top of the switch air chamber (3), a door (92) hinged to the lower right side of the front part of the rectangular seat (91), an air inlet pipe (93) connected to the bottom right side of the door (92), an air inlet valve (94) connected to the bottom end of the air inlet pipe (93), a mesh seat (95) locked and fixed inside the right side of the rectangular seat (91), a molecular sieve (96) filled inside the mesh seat (95), a reversing structure (97) connected to the middle left side of the mesh seat (95), an exhaust valve (98) installed on the top left side of the reversing structure (97), and an air supply valve (99) fastened to the bottom of the reversing structure (97). The air inlet valve (94) is disposed through the bottom side inside the switch air chamber (3), the reversing structure (97) is disposed inside the left side of the rectangular seat (91), and the exhaust valve (98) is located above the switch air chamber (3).

8. A 24kV gas-insulated environmental protection cabinet according to claim 7, characterized in that: The rear part of the mesh base (95) is provided with an electric heating element for heating the molecular sieve (96). The air inlet on the right side of the mesh base (95) is connected to the air inlet pipe (93), and the air outlet on the left side of the mesh base (95) is connected to the reversing structure (97).

9. A 24kV gas-insulated environmental protection cabinet according to claim 7, characterized in that: The reversing structure (97) includes a rectangular compartment (971) fixed inside the left side of the rectangular base (91), a first motor (972) locked and fixed above the rear of the rectangular compartment (971), a first gear (973) connected to the front output shaft of the first motor (972), a second gear (974) meshing with the bottom side of the first gear (973), a horizontal tube (975) passing through and fixed in the middle of the left side of the rectangular compartment (971), a disc seat (976) welded and fixed to the left end of the horizontal tube (975), and a second motor (977) locked and fixed in the middle of the rear of the disc seat (976). The T-shaped partition (978) is connected to the front output shaft of the second motor (977), and the first air outlet pipe (979) and the second air outlet pipe (9710) are respectively fixedly connected to the upper and lower sides of the disc seat (976). The first gear (973) and the second gear (974) are respectively rotatably connected to the upper and lower sides inside the rectangular compartment (971). The T-shaped partition (978) is rotatably connected to the inside of the disc seat (976). The left end of the first air outlet pipe (979) is connected to the exhaust valve (98), and the bottom end of the second air outlet pipe (9710) is connected to the air supply valve (99).

10. A 24kV gas-insulated environmental protection cabinet according to claim 9, characterized in that: The included angle between the horizontal tube (975) and the first air outlet tube (979) and the second air outlet tube (9710) is 90 degrees. The three ends of the T-shaped partition (978) are provided with sealing strips, and the sealing strips are in contact with the inner wall of the disc seat (976).

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