A fully insulated high-voltage gas-filled cabinet

Abstract

This invention provides a fully insulated high-voltage gas-filled switchgear, belonging to the technical field of high-voltage power equipment. The switchgear includes a cabinet, a gas filling box, a main gas chamber, a zoned gasbag array mechanism, a thermally linked heat exchange mechanism, and a self-cleaning heat exchange component. The zoned gasbag array mechanism dynamically adjusts the SF6 gas distribution through flexible gasbags and a thermosensitive elastic membrane, in conjunction with a pressure-response distribution component, to achieve enhanced insulation in high-temperature areas. The thermally linked heat exchange mechanism utilizes a honeycomb heat dissipation mesh and bimetallic heat sinks to optimize heat balance. The self-cleaning heat exchange component removes byproducts through a vibrating screen and a hydrophobic coating, reducing maintenance frequency. This invention solves the problems of high partial discharge risk, uneven heat distribution, large SF6 gas emissions, and frequent maintenance in traditional gas-filled switchgear, achieving adaptive zoned insulation, efficient heat dissipation, gas recycling, and low-maintenance operation. It is suitable for large-scale applications and significantly improves insulation performance, operational reliability, and environmental friendliness.

Description

Technical Field

[0001] This invention relates to the field of high-voltage power equipment technology, and in particular to a fully insulated high-voltage gas-filled switchgear. Background Technology

[0002] Fully insulated high-voltage gas-filled switchgear is a widely used high-voltage switchgear in power distribution systems, primarily for power distribution, protection, and control in medium- and high-voltage power grids (e.g., 10kV-35kV). This device employs a fully enclosed structure, filled internally with SF6 gas or other insulating gases as the insulating medium, forming insulation protection around key electrical components (such as circuit breakers, busbars, and switches) to prevent interference from electric arcs, partial discharges, and external environmental factors (such as moisture and dust). Gas-filled switchgear offers advantages such as compact structure, reliable operation, high safety, and low maintenance requirements, and is widely used in urban substations, industrial parks, wind farms, and extreme environments (such as coastal and high-altitude areas). Its core components include the gas filling box (including the main gas chamber), electrical components, a sealing system, and a heat dissipation mechanism. Gas circulation, pressure maintenance, and heat management are achieved through mechanical or electrical control methods to ensure long-term stable operation of the equipment.

[0003] Existing fully insulated high-voltage gas-filled switchgear still has several shortcomings in practical applications. First, the pressure distribution of SF6 gas is relatively uniform, making it difficult to dynamically adjust according to differences in temperature or electric field strength in the areas of electrical components. This can lead to partial discharge in high-load areas due to insufficient gas pressure, while low-load areas may experience excessively high gas pressure, increasing sealing stress. Second, uneven internal heat distribution can easily cause localized overheating in areas with high heat generation (such as circuit breakers), affecting component lifespan. Traditional heat dissipation mechanisms (such as fixed heat exchange tubes or external heat sinks) have limited efficiency and are susceptible to external dust or moisture, increasing maintenance burden. Furthermore, during long-term operation, SF6 gas may decompose due to electric arc, producing byproducts (such as SOF2 and HF) that can clog heat exchange channels and reduce heat dissipation efficiency. Existing designs often rely on electrical control systems (such as sensors and solenoid valves) for gas management and heat dissipation, increasing complexity and failure risks. Especially in high-temperature, vibration, or remote unmanned environments, the lack of reliable solutions using purely mechanical structures limits the environmental adaptability and long-term stability of the equipment. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0006] Therefore, this invention achieves adaptive zoned insulation and heat balance of SF6 gas in a fully insulated high-voltage gas-filled cabinet through a purely mechanical structure, solving the problems of single pressure distribution, uneven heat distribution, and complex maintenance.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a fully insulated high-voltage gas-filled switchgear, comprising a cabinet, a partitioned gasbag array mechanism, and a thermal linkage heat exchange mechanism, wherein:

[0008] An air box is fixedly installed at the center of the cabinet, and the air box has a main air chamber inside.

[0009] The partitioned airbag array mechanism includes multiple flexible airbags arrayed on the lower side of the main air chamber. The multiple flexible airbags are fixed to the inner wall of the inflation box by flexible brackets. The bottom ends of the multiple flexible airbags extend to the inner bottom wall of the inflation box and are connected to a first one-way valve assembly through a micro elastic tube. The bottom ends of the multiple first one-way valve assemblies are connected to a manifold. The rear end of the manifold is connected to a guide tube, and the output end of the guide tube extends to the inner top wall of the inflation box and passes through to the upper side of the main air chamber. A pressure response distribution component is provided on one side of each of the multiple flexible brackets.

[0010] The thermal linkage heat exchange mechanism includes fixed frames that are fixedly installed on the left and right sides of the main air chamber. A honeycomb heat dissipation mesh is provided inside the fixed frame and on the side close to the inner wall of the air filling box. Movable components are symmetrically arranged on the front and rear sides inside the fixed frame, and multiple bimetallic heat dissipation fins are arranged between the two sets of movable components. Self-cleaning heat exchange components are provided on the opposite sides of the two sets of fixed frames.

[0011] As a preferred embodiment of the fully insulated high-voltage gas-filled switchgear of the present invention, wherein: the first one-way valve assembly includes a connecting channel opened directly below the miniature elastic tube, and the connecting channel has a through structure that is narrow at the top and wide at the bottom, and the top end of the connecting channel is connected to the output end of the miniature elastic tube, and its bottom end is connected to the manifold, a first telescopic spring is fixedly connected to the inner top wall of the connecting channel, a sealing plate is fixedly connected to the bottom end of the first telescopic spring, and the sealing plate is movably engaged at the junction of the narrow channel and the wide channel of the connecting channel.

[0012] As a preferred embodiment of the fully insulated high-voltage gas-filled switchgear of the present invention, the pressure response distribution component includes a fixed cylinder fixedly installed on the top wall of the gas-filled box, a telescopic cavity is provided on the lower side of the inside of the fixed cylinder, openings are symmetrically provided on the left and right sides of the telescopic cavity, an expansion spring is fixedly connected to the inner top wall of the telescopic cavity, a hollow float is fixedly connected to the bottom end of the expansion spring, a U-shaped connecting rod is fixedly connected to the bottom end of the hollow float, and the other end of the U-shaped connecting rod passes through the manifold and extends into the connecting channel and is fixedly connected to the bottom end of the sealing sheet.

[0013] As a preferred embodiment of the fully insulated high-voltage gas-filled switchgear of the present invention, wherein: a main valve assembly is provided at the top of the multiple sets of pressure response distribution components, the main valve assembly includes a cavity opened in the top wall of the gas filling box, and the top ends of multiple fixed cylinders are all connected to the cavity, a pressure plate is slidably connected to the middle of the cavity, a bolt is provided at the middle of the top of the pressure plate, and the top of the bolt passes through the top wall of the gas filling box and the switchgear in sequence and extends to the outside of it to be fixedly connected to a knob, and push rods are arrayed at the bottom of the pressure plate, and the bottom ends of multiple push rods extend into the interior of multiple fixed cylinders and are respectively connected to multiple hollow floats.

[0014] As a preferred embodiment of the fully insulated high-voltage gas-filled switchgear of the present invention, wherein: the two sets of movable components respectively include fixed frames fixedly connected to the front and rear walls inside the fixed frame, and sliding plates that can slide up and down are slidably connected inside the two fixed frames. Multiple hinge shafts are arranged equidistantly from top to bottom on the opposite surfaces of the two sliding plates, and multiple bimetallic heat sinks are respectively hinged between every two hinge shafts.

[0015] As a preferred embodiment of the fully insulated high-voltage gas-filled switchgear of the present invention, wherein: the outer surface of each of the plurality of flexible airbags is covered with a layer of thermosensitive elastic film, and a connecting rod is hinged to the outer surface of the flexible airbag near the fixed frame, and the other end of the connecting rod is hinged to the bottom end of the slide plate.

[0016] As a preferred embodiment of the fully insulated high-voltage gas-filled switchgear of the present invention, the self-cleaning heat exchange component includes a connecting frame embedded in the outer walls of the left and right sides of the gas-filled box. A circulation chamber is provided on the outer side inside the connecting frame. The input end of the circulation chamber is connected to multiple heat exchange channels, and the inlet ends of the multiple heat exchange channels are connected to the honeycomb holes of the heat dissipation mesh. A vibrating screen is provided at the connection between the circulation chamber and the multiple heat exchange channels. A collection trough is provided at the bottom of the circulation chamber.

[0017] In a preferred embodiment of the fully insulated high-voltage gas-filled switchgear of the present invention, a collection box is slidably connected inside the collection trough, and a handle is fixedly installed on the outer wall of the collection box.

[0018] As a preferred embodiment of the fully insulated high-voltage gas-filled switchgear of the present invention, wherein: an exhaust port is provided on the upper side of the switchgear, the output end of the exhaust port is connected to the outside, the input end is connected to the circulation chamber, and a second one-way valve assembly is provided inside the exhaust port.

[0019] As a preferred embodiment of the fully insulated high-voltage gas-filled switchgear of the present invention, the second one-way valve assembly includes a sealing plate sealed at the junction of the wide and narrow channels inside the exhaust port, a second telescopic spring is fixedly connected to the inner side of the sealing plate, and the other end of the second telescopic spring is fixedly connected to the inner wall of the connecting frame.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention uses a flexible airbag and a thermosensitive elastic membrane to sense changes in pressure and temperature in the main gas chamber. Combined with the hollow float and U-shaped connecting rod of the pressure response distribution component, it dynamically adjusts the SF6 gas flow direction. In high-temperature areas, the airbag expands to draw in gas, enhancing the insulation strength of high-load areas such as circuit breakers and busbars, significantly reducing the risk of partial discharge. In low-temperature areas, the airbag contracts to release gas, optimizing airflow distribution, reducing sealing stress, and ensuring stable overall system insulation performance.

[0022] 2. In this invention, the thermal linkage heat exchange mechanism guides SF6 airflow to high-load areas through the synergistic effect of a honeycomb heat dissipation mesh and bimetallic heat sinks, enhancing convective heat transfer and significantly reducing the main air temperature difference. Movable components and connecting rods convert the airbag expansion force into heat sink oscillation, dynamically adjusting the airflow direction and optimizing heat dissipation in high-temperature areas. The self-cleaning heat exchange component's heat exchange channels efficiently transfer heat to the outer wall, preventing overheating of electrical components and extending equipment lifespan.

[0023] 3. This invention uses a manifold and guide pipe to directly introduce SF6 gas from the gas bag into the upper part of the main gas chamber, forming a closed loop and reducing gas loss. The main valve assembly, along with a knob and push rod, allows manual operation during maintenance by driving a hollow float to open a one-way valve, temporarily storing the SF6 gas in the main gas chamber within the gas bag. No external equipment is required, reducing emission risks. The second one-way valve ensures that only a small amount of hot air is emitted from the exhaust port, prioritizing gas circulation by utilizing the high density of SF6 gas, thus meeting environmental standards.

[0024] 4. The self-cleaning heat exchange components automatically remove SF6 decomposition byproducts through the hydrophobic coating on the vibrating screen and heat exchange channels, preventing channel blockage and maintaining efficient heat exchange. The collection tank and removable collection box facilitate regular cleaning of byproducts, and together with the cabinet inspection port, simplify maintenance operations, significantly reduce maintenance frequency, and ensure long-term operational reliability.

[0025] 5. This invention employs a purely mechanical design, uses SF6-resistant materials, requires no electronic components, and is resistant to high temperatures, high humidity, and strong electromagnetic interference, making it suitable for extreme environments such as deserts and high altitudes. The expansion spring optimizes the float sensitivity at high temperatures, enhancing the system's rapid response to pressure and temperature, ensuring operational stability and reliability. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0027] Figure 1 This is a perspective view of the overall structure of the present invention;

[0028] Figure 2 This is a three-dimensional orthographic sectional view of the present invention;

[0029] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A;

[0030] Figure 4 This is a perspective front sectional view of the connection between the connecting frame and the exhaust port of the present invention;

[0031] Figure 5 This is a perspective front sectional view of the connection between the manifold and the air box of the present invention;

[0032] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B;

[0033] Figure 7 This is a perspective front sectional view of the connection between the main valve assembly and the air tank of the present invention;

[0034] Figure 8 This is a perspective enlarged view of the connection between the fixed frame, the movable component, and the bimetallic heat sink of the present invention;

[0035] Figure 9 This is a three-dimensional side sectional view of the present invention;

[0036] Figure 10 This is a three-dimensional cross-sectional view of the connection between the flexible airbag and the movable component of the present invention. Detailed Implementation

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0040] Example

[0041] Reference Figures 1-9 This embodiment provides a fully insulated high-voltage gas-filled switchgear, which is suitable for 12kV high-voltage power systems. It achieves adaptive zone insulation, heat balance, gas circulation and self-cleaning functions of SF6 gas through a purely mechanical structure, making it particularly suitable for high loads and extreme environments (such as deserts and high altitudes).

[0042] Specifically, the gas-filled switchgear includes a cabinet 100, with a gas filling box 101 fixedly installed at the center of the cabinet 100. The gas filling box 101 has a main gas chamber 102 inside. The cabinet 100 is made of stainless steel, with a front access door and top wiring terminals for easy maintenance, providing high-strength and corrosion-resistant external protection to ensure long-term operational stability. The gas filling box 101 has a stainless steel shell, fixed by an internal frame. Its main gas chamber 102 is filled with SF6 gas (pressure 1.0-1.5 bar, molecular weight 146 g / mol), providing a high-dielectric-strength insulating environment for electrical components such as circuit breakers, busbars, and switches. The main gas chamber 102 uses a silicone gasket to ensure no SF6 gas leakage, supports dynamic gas distribution, optimizes local insulation performance, reduces the risk of partial discharge, and maintains pressure balance to extend equipment life.

[0043] The partitioned airbag array mechanism 200 includes multiple flexible airbags 201 arrayed on the lower side of the main air chamber 102. The multiple flexible airbags 201 are fixed to the inner wall of the inflation box 101 by flexible brackets 202. The bottom ends of the multiple flexible airbags 201 extend to the inner bottom wall of the inflation box 101 and are connected to a first one-way valve assembly 204 through a micro elastic tube 203. The bottom ends of the multiple first one-way valve assemblies 204 are connected to a manifold 205. The rear end of the manifold 205 is connected to a guide tube 206, and the output end of the guide tube 206 extends to the inner top wall of the inflation box 101 and passes through to the upper side of the main air chamber 102. A pressure response distribution assembly 207 is provided on one side of each of the multiple flexible brackets 202. The flexible airbag 201 is made of silicone rubber reinforced aramid fiber, resistant to SF6 corrosion. Its volume is adjusted through thermal response; at high temperatures (>40℃), it expands to draw in SF6 gas, increasing the local pressure to 1.5 bar, enhancing the insulation strength of high-load areas (such as circuit breakers or busbars); at low temperatures (<20℃), it contracts to release gas, optimizing airflow distribution and reducing sealing stress in low-load areas. The flexible support 202 is made of silicone and is bolted to the inner wall of the inflation box, maintaining an appropriate distance from electrical components to ensure airbag stability and avoid interfering with the electric field distribution. The miniature elastic tube 203 is also made of silicone, resistant to SF6 corrosion, and remains flexible to adapt to changes in airbag volume. It connects the airbag to the manifold, supporting unidirectional gas flow. The manifold 205 is made of stainless steel, collecting the gas flow from each airbag pipe and delivering it to the guide tube 206 to ensure smooth airflow in the system. The guide tube 206 is made of stainless steel and runs along the inner wall, directly introducing SF6 gas from the manifold to the upper side of the main air chamber 102, promoting gas circulation and maintaining pressure balance in the main air chamber. The pressure response distribution component 207 senses the pressure change in the main air chamber and controls the opening of the first one-way valve component 204 to adjust the gas flow direction between the airbag and the manifold, supporting gas storage during maintenance and reducing SF6 emissions.

[0044] The first one-way valve assembly 204 includes a connecting channel 204a located directly below the miniature elastic tube 203. The connecting channel 204a has a through-type structure, narrower at the top and wider at the bottom. The top end of the connecting channel 204a is connected to the output end of the miniature elastic tube 203, and its bottom end is connected to the manifold 205. A first telescopic spring 204b is fixedly connected to the inner top wall of the connecting channel 204a, and a sealing plate 204c is fixedly connected to the bottom end of the first telescopic spring 204b. The sealing plate 204c is movably engaged at the junction of the narrow and wide channels of the connecting channel 204a. The connecting channel 204a is made of stainless steel and is airtightly connected to the pipe and manifold via a silicone sealing gasket. Its narrow-at-the-top, wide-at-the-bottom structure optimizes airflow control, reduces pressure loss, and improves one-way flow efficiency. The first telescopic spring 204b, also made of stainless steel, provides constant tension (0.1-0.2 bar) to ensure that the sealing plate 204c normally closes the junction, preventing gas backflow. The sealing disc 204c is made of stainless steel and opens under pressure when the pipeline pressure exceeds the manifold by 0.1 bar, allowing SF6 gas to flow unidirectionally from the miniature elastic tube 203 into the manifold 205 through a precise snap-fit. Under reverse pressure, the spring resets and drives the sealing disc to close the channel, maintaining pressure balance between the airbag and the main air chamber. The first one-way valve assembly 204, with its low-pressure-difference, high-sensitivity design, ensures precise control of the airbag's intake and exhaust, enhances local insulation, and reduces the risk of overvoltage or undervoltage.

[0045] The pressure response distribution assembly 207 includes a fixed cylinder 207a fixedly installed on the top wall of the inflation chamber 101. A telescopic cavity 207b is formed on the lower side of the fixed cylinder 207a. Openings 207c are symmetrically formed on the left and right sides of the telescopic cavity 207b. An expansion spring 207d is fixedly connected to the top wall of the telescopic cavity 207b. A hollow float 207e is fixedly connected to the bottom end of the expansion spring 207d. A U-shaped connecting rod 207f is fixedly connected to the bottom end of the hollow float 207e. The other end of the U-shaped connecting rod 207f passes through the manifold 205 and extends into the connecting channel 204a, where it is fixedly connected to the bottom end of the sealing plate 204c. The fixed cylinder 207a is made of stainless steel and is bolted to the top of the inflation chamber, housing the float and spring and protecting the internal mechanism from SF6 gas corrosion. The telescopic cavity 207b connects to the main gas chamber through the opening 207c, allowing SF6 gas to flow into and drive the float, ensuring real-time pressure sensing. The expansion spring 207d is made of nickel-titanium alloy (shape memory alloy), which elongates at high temperatures (>40℃), reducing float guiding friction, improving sensitivity to minute pressure changes (0.05 bar), and optimizing gas distribution in high-temperature regions. The hollow float 207e is made of aluminum alloy, utilizing buoyancy (SF6 density 6-9 kg / m³). 3The system senses changes in the main gas chamber pressure (1.0-1.5 bar), causing it to float up and down, driving the U-shaped connecting rod 207f. The U-shaped connecting rod 207f, made of stainless steel, extends through the sealing interface (silicone sealing ring) of the manifold to the connecting channel 204a, pulling the sealing plate 204c to control the opening of the first one-way valve assembly 204, regulating the flow of SF6 gas from the miniature elastic tube 203 into the manifold 205. The pressure response distribution assembly 207, through the cooperation of buoyancy and a spring, dynamically controls the opening of the one-way valve, prioritizing gas delivery to the high-temperature gas chamber, enhancing insulation performance, and simultaneously supporting manual maintenance operations.

[0046] A main valve assembly 208 is provided at the top of the multiple pressure response distribution components 207. The main valve assembly 208 includes a cavity 208a formed in the top wall of the inflation chamber 101, and the tops of multiple fixed cylinders 207a are connected to the cavity 208a. A pressure plate 208b is slidably connected to the middle of the cavity 208a. A bolt 208c is provided at the middle of the top of the pressure plate 208b, and the top of the bolt 208c passes through the top walls of the inflation chamber 101 and the cabinet 100 and extends to the outside to be fixedly connected to a knob 208d. Push rods 208e are arrayed at the bottom of the pressure plate 208b, and the bottoms of multiple push rods 208e extend into the interior of multiple fixed cylinders 207a and are respectively connected to multiple hollow floats 207e. The cavity 208a is made of stainless steel and is connected to the fixed cylinders through a silicone sealing gasket to ensure the airtightness of SF6 gas. The pressure plate 208b, made of stainless steel, slides within the cavity, evenly distributing the thrust of the knob. The bolt 208c, also made of stainless steel, is driven by the knob 208d (aluminum alloy), located at the top of the cabinet's access panel for easy manual operation. The push rod 208e connects to the hollow float 207e via a sliding seal (silicone sealing ring), synchronously transmitting downward pressure. The main valve assembly 208, by rotating the knob 208d, drives the bolt and pressure plate downwards. Simultaneously, the push rod 208e pushes multiple hollow floats 207e downwards, pulling the U-shaped connecting rod 207f, opening all first one-way valve assemblies 204, and introducing SF6 gas from the main gas chamber into the gas bag for temporary storage, enabling leak-free maintenance and reducing SF6 emissions and maintenance costs.

[0047] The thermal linkage heat exchange mechanism 300 includes fixed frames 301 fixedly installed on the left and right sides of the main gas chamber 102. A honeycomb-shaped heat dissipation mesh 302 is provided inside the fixed frame 301 and on the side close to the inner wall of the gas filling box 101. Movable components 303 are symmetrically arranged on the front and rear sides inside the fixed frame 301, and multiple bimetallic heat sinks 304 are arranged between the two sets of movable components 303. Self-cleaning heat exchange components 305 are provided on the opposite sides of both sets of fixed frames 301. The fixed frame 301 is made of stainless steel and welded to the inner wall of the gas filling box, covering the left and right sides of the main gas chamber, supporting the heat dissipation mesh and movable components, and ensuring structural stability. The honeycomb-shaped heat dissipation mesh 302 is made of copper-aluminum alloy (thermal conductivity >200W / m·K), providing a large heat exchange surface through its honeycomb structure, guiding the flow of SF6 gas, and transferring heat from high-load areas such as circuit breakers or busbars to the self-cleaning heat exchange components, reducing the temperature difference of the main gas chamber (<10℃). The movable component 303 drives the heat sink to swing via a sliding plate motion, dynamically adjusting the airflow direction and enhancing convective heat transfer in high-temperature areas. The bimetallic heat sink 304, made of copper-steel composite material, bends at high temperatures (>50°C) to guide SF6 airflow to high-load areas, balancing heat distribution, preventing overheating of electrical components, and extending equipment lifespan. The thermal linkage heat exchange mechanism 300 optimizes heat distribution in the main air chamber through the synergistic effect of the heat dissipation mesh and heat sink, ensuring long-term operational stability.

[0048] The two sets of movable components 303 each include a fixed frame 303a fixedly connected to the front and rear walls inside the fixed frame 301. Sliding slides 303b are slidably connected inside each of the two fixed frames 303a. Multiple hinge pins 303c are equidistantly arranged on the opposite surfaces of the two slides 303b from top to bottom. Multiple bimetallic heat sinks 304 are hinged between each pair of hinge pins 303c. The fixed frames 303a are fixed to the inner wall of the fixed frame, supporting the movement of the slides and ensuring structural rigidity. The slides 303b slide through a low-friction coating (PTFE), responding to the airbag's movement and transmitting mechanical force. The equidistant hinge pins 303c fix the heat sinks, allowing them to swing flexibly. The movable components 303 are linked to the airbag linkage via the slides, converting the mechanical force of the airbag expansion into the swinging of the heat sinks, dynamically adjusting the airflow direction, enhancing heat exchange efficiency in high-temperature areas, and working in conjunction with the airbag to achieve dual optimization of temperature and insulation.

[0049] Multiple flexible airbags 201 have an outer surface covered with a thermosensitive elastic membrane 201a. A connecting rod 201b is hinged to the outer surface of the flexible airbag 201 closest to the fixed frame 301, with the other end of the connecting rod 201b hinged to the bottom end of the sliding plate 303b. The thermosensitive elastic membrane 201a is made of silicon-based elastomer (embedded with shape memory fibers). It expands at high temperatures (>40℃), driving the airbag to draw in SF6 gas and enhancing local insulation; it contracts at low temperatures (<20℃), releasing gas, promoting airflow circulation, and optimizing the pressure distribution in the main air chamber. The connecting rod 201b is made of aluminum alloy and connects the airbag and the sliding plate via a hinge, transmitting the expansion force of the thermosensitive membrane to the sliding plate 303b, driving the heat sink 304 to swing and enhancing airflow guidance in high-temperature areas. The thermosensitive elastic membrane 201a and the connecting rod 201b, by coupling the airbag and the heat dissipation mechanism, achieve coordinated control of temperature response and heat exchange, improving the system's adaptability to high-load environments.

[0050] The self-cleaning heat exchange component 305 includes a connecting frame 305a embedded in the outer walls of the left and right sides of the inflation chamber 101. A circulation chamber 305b is formed on the outer side of the connecting frame 305a. The input end of the circulation chamber 305b connects to multiple heat exchange channels 305c, and the inlet ends of the multiple heat exchange channels 305c are connected to the honeycomb holes of the heat dissipation mesh. A vibrating screen 305d is provided at the connection points between the circulation chamber 305b and the multiple heat exchange channels 305c. A collection groove 305e is formed at the bottom of the circulation chamber 305b. The connecting frame 305a is made of stainless steel and embedded in the outer wall of the inflation chamber, supporting the heat exchange channels and the circulation chamber to ensure structural airtightness. The circulation chamber 305b transfers heat from the heat dissipation mesh 302 to the outer wall through the heat exchange channels 305c (made of aluminum alloy with a hydrophobic fluoropolymer coating on the inner wall), reducing the temperature of the main air chamber. The vibrating screen 305d vibrates driven by airflow to remove SF6 decomposition byproducts (such as SOF2), preventing channel blockage and maintaining efficient heat exchange. The collection tank 305e collects byproducts, facilitating regular cleaning and reducing maintenance frequency. The self-cleaning heat exchange assembly 305, through the synergistic effect of a hydrophobic coating and a vibrating screen, ensures long-term heat dissipation efficiency and extends equipment life.

[0051] The collection tank 305e has a sliding connection to a collection box 305f, and a handle 305g is fixedly installed on the outer wall of the collection box 305f. The collection box 305f is made of stainless steel and its sliding design allows for easy removal from the inspection port at the bottom of the cabinet to collect byproducts, simplifying cleaning operations. The handle 305g facilitates operator access and, in conjunction with the inspection port design (equipped with a silicone sealing gasket), ensures no SF6 leakage during cleaning. The collection tank 305e and collection box 305f are detachable, supporting low-maintenance operation and reducing the impact of byproducts on system performance.

[0052] An exhaust port 103 is provided on the upper side of the cabinet 100. The output end of the exhaust port 103 is connected to the outside, and the input end is connected to the circulation chamber 305b. A second one-way valve assembly 104 is provided inside the exhaust port 103. The exhaust port 103 (with a weatherproof cover) is located at the top of the cabinet and discharges a small amount of hot air (<0.01% / hour) to maintain a stable temperature in the main air chamber while preventing outside air from entering and protecting the SF6 gas environment. The second one-way valve assembly 104 includes a sealing plate 104a that seals the junction of the wide and narrow channels inside the exhaust port 103. A second telescopic spring 104b is fixedly connected to the inner side of the sealing plate 104a, and the other end of the second telescopic spring 104b is fixedly connected to the inner wall of the connecting frame 305a. The sealing plate 104a is made of stainless steel and is normally closed under the tension of the second telescopic spring 104b (stainless steel, tension 0.05-0.1 bar) to prevent SF6 gas leakage. When the hot air pressure in the circulation chamber exceeds 0.05 bar, the sealing plate opens, releasing the hot air. Due to its high molecular weight (146 g / mol), the SF6 gas is deposited at the bottom of the circulation chamber and preferentially circulates back to the main gas chamber. The second one-way valve assembly 104 optimizes system operating efficiency by balancing heat dissipation and gas retention through precise pressure control.

[0053] It should be noted that the molecular weight of SF6 gas (146 g / mol) is much larger than that of air (29 g / mol). Therefore, it tends to deposit within the circulation chamber 305b rather than flowing out through the upper exhaust port 103. The second one-way valve design ensures that only a small amount of hot air is discharged, while the SF6 gas remains in the channel for circulation due to pressure and density differences. This design effectively reduces SF6 emissions, meeting environmental protection requirements, and simultaneously maintains thermal balance in the main gas chamber through the synergistic effect of the circulation chamber and heat exchange channel.

[0054] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0055] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0056] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A fully insulated high-voltage gas-filled switchgear, characterized in that: include, The cabinet has an air box fixedly installed at the center of its interior, and the air box has a main air chamber inside. A partitioned airbag array mechanism includes multiple flexible airbags arrayed below the main air chamber. The multiple flexible airbags are fixed to the inner wall of the inflation chamber by flexible supports. The bottom ends of each flexible airbag extend to the inner bottom wall of the inflation chamber and are connected to a first one-way valve assembly via micro-elastic tubes. The bottom ends of the multiple first one-way valve assemblies are connected to a manifold. The rear end of the manifold is connected to a guide tube, and the output end of the guide tube extends to the inner top wall of the inflation chamber and exits to the upper side of the main air chamber. A pressure response distribution component is provided on one side of each of the multiple flexible supports; and... The thermal linkage heat exchange mechanism includes fixed frames that are fixedly installed on the left and right sides of the main air chamber. A honeycomb heat dissipation mesh is provided inside the fixed frame and on the side close to the inner wall of the air box. Movable components are symmetrically arranged on the front and rear sides inside the fixed frame, and multiple bimetallic heat dissipation fins are arranged between the two sets of movable components. Self-cleaning heat exchange components are provided on the opposite sides of the two sets of fixed frames. The first one-way valve assembly includes a connecting channel opened directly below the miniature elastic tube. The connecting channel has a through structure that is narrow at the top and wide at the bottom. The top end of the connecting channel is connected to the output end of the miniature elastic tube, and its bottom end is connected to the manifold. A first telescopic spring is fixedly connected to the inner top wall of the connecting channel. A sealing plate is fixedly connected to the bottom end of the first telescopic spring, and the sealing plate is movably engaged at the junction of the narrow channel and the wide channel of the connecting channel. The pressure response distribution assembly includes a fixed cylinder fixedly installed on the top wall of the air box. A telescopic cavity is opened on the lower side inside the fixed cylinder. Openings are symmetrically opened on the left and right sides of the telescopic cavity. An expansion spring is fixedly connected to the top wall of the telescopic cavity. A hollow float is fixedly connected to the bottom end of the expansion spring. A shaped connecting rod is fixedly connected to the bottom end of the hollow float. The other end of the shaped connecting rod passes through the manifold and extends into the connecting channel, where it is fixedly connected to the bottom end of the sealing sheet. A master valve assembly is provided at the top of the multiple pressure response distribution components. The master valve assembly includes a cavity formed in the top wall of the inflation box, and the tops of the multiple fixed cylinders are connected to the cavity. A pressure plate is slidably connected to the middle of the cavity. A bolt is provided at the middle of the top of the pressure plate, and the top of the bolt passes through the top wall of the inflation box and the cabinet in sequence and extends to the outside to be fixedly connected to a knob. Push rods are arrayed at the bottom of the pressure plate, and the bottom ends of the multiple push rods extend into the interior of the multiple fixed cylinders and are respectively connected to the multiple hollow floats.

2. The fully insulated high-voltage gas-filled switchgear as described in claim 1, characterized in that: The two sets of movable components each include a fixed frame fixedly connected to the front and rear walls inside the fixed frame. The interior of each fixed frame is slidably connected to a sliding plate that can slide up and down. Multiple hinge pins are arranged equidistantly from top to bottom on the opposite surfaces of the two sliding plates. Multiple bimetallic heat sinks are respectively hinged between every two hinge pins.

3. The fully insulated high-voltage gas-filled switchgear as described in claim 2, characterized in that: The outer surface of each of the flexible airbags is covered with a layer of thermosensitive elastic film. A connecting rod is hinged to the outer surface of the flexible airbag near the fixing frame, and the other end of the connecting rod is hinged to the bottom end of the slide plate.

4. The fully insulated high-voltage gas-filled switchgear as described in claim 3, characterized in that: The self-cleaning heat exchange component includes a connecting frame embedded in the outer walls of the left and right sides of the air-filled box. A circulation chamber is provided on the outer side inside the connecting frame. The input end of the circulation chamber is connected to multiple heat exchange channels, and the inlet ends of the multiple heat exchange channels are connected to the honeycomb holes of the heat dissipation mesh. A vibrating screen is provided at the connection between the circulation chamber and the multiple heat exchange channels. A collection trough is provided at the bottom of the circulation chamber.

5. The fully insulated high-voltage gas-filled switchgear as described in claim 4, characterized in that: The collection trough is slidably connected to a collection box, and a handle is fixedly installed on the outer wall of the collection box.

6. The fully insulated high-voltage gas-filled switchgear as described in claim 5, characterized in that: The cabinet has an exhaust port on its upper side. The output end of the exhaust port is connected to the outside, and the input end is connected to the circulation chamber. A second one-way valve assembly is installed inside the exhaust port.

7. The fully insulated high-voltage gas-filled switchgear as described in claim 6, characterized in that: The second one-way valve assembly includes a sealing plate that seals the junction of the wide and narrow channels inside the exhaust port. A second telescopic spring is fixedly connected to the inner side of the sealing plate, and the other end of the second telescopic spring is fixedly connected to the inner wall of the connecting frame.

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