Environment-friendly inflatable high-voltage switch cabinet

Abstract

The invention discloses an environment-friendly inflatable high-voltage switch cabinet, and relates to the technical field of power dispatching supply high-voltage switch cabinets. The high-voltage switch cabinet comprises a high-voltage switch cabinet body, an inner side framework, an adjusting electric control telescopic rod, a horizontal sliding plate, a longitudinal sliding rod, a local electric cylinder, a switch mounting bent frame and a dynamic gas supplementing assembly. Flexible installation of a switch and precise butt joint of a local electric cylinder are realized through an adjustable framework structure in the cabinet body; the gas dynamic supplement assembly utilizes an evaporator, a condenser, an air pump, a return pipe and other structures to achieve dehumidification, drying supplement and circulating heat dissipation of air in the cabinet, and through real-time monitoring and automatic regulation and control of a humidity sensor, it is ensured that the humidity of the air in the cabinet is stabilized at a low level, so that the dielectric property of the air serving as an insulating medium is kept stable. Greenhouse gases such as sulfur hexafluoride do not need to be used, and environmental protection, high-reliability insulation and effective heat dissipation are achieved through cooperative control over humidity adjustment and dielectric properties of an air medium.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear technology for power dispatching and supply, specifically an environmentally friendly gas-insulated high-voltage switchgear. Background Technology

[0002] Existing high-voltage switchgear mostly uses sulfur hexafluoride (SF6) gas as the insulating medium. This gas has extremely high dielectric strength, enabling reliable insulation within a small volume, and is widely used in medium and high-voltage power distribution equipment. However, SF6 is a strong greenhouse gas, with a greenhouse potential tens of thousands of times greater than carbon dioxide. A leak would cause long-term and serious environmental impacts, and its recycling and disposal after use is complex and costly, posing significant environmental risks. Furthermore, traditional gas-filled switchgear has a sealed internal structure, making it difficult to effectively dissipate heat generated by electrical components during operation. This can easily lead to increased internal temperature, affecting insulation performance and equipment lifespan. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: an environmentally friendly gas-filled high-voltage switchgear, comprising a high-voltage switchgear body with an internally fixed frame, wherein horizontal sliding plates are slidably installed at the top and bottom of the internal frame along the horizontal direction, and multiple parallel and vertically arranged longitudinal sliding rods are fixedly installed between the two horizontal sliding plates; multiple switch mounting brackets are fixedly installed inside the internal frame, and multiple switches can be fixed on each switch mounting bracket, wherein each longitudinal sliding rod is rotatably and slidably fitted with the same number of local electric cylinders as the switch mounting brackets, and the local electric cylinders are used to drive the contact head on the switch to move; a gas dynamic replenishment component is also fixedly installed on the side of the high-voltage switchgear body, the gas dynamic replenishment component includes an execution cavity, a partition is fixedly installed in the middle of the inner wall of the execution cavity, the partition divides the inner wall of the execution cavity into two spaces, the bottoms of the two spaces are connected to form a water collection pool, and an evaporator and a condenser are fixedly installed in the two spaces inside the execution cavity respectively; an S-shaped water seal bend pipe is connected to the bottom of the water collection pool, and liquid water is reserved in the S-shaped water seal bend pipe.

[0004] Preferably, a detection chamber is reserved at the top of the space where the condenser is located within the execution chamber, and a temperature sensor and a humidity sensor are installed inside the detection chamber; wherein a vibration generator is fixedly installed on the evaporator to make the evaporator vibrate.

[0005] Preferably, an air pump is fixedly installed on the top of the execution chamber. The air pump's inlet is connected to the inside of the detection chamber, and the air pump's exhaust port is connected to a three-way pipe. The other two ports of the three-way pipe are respectively fixedly connected to a first electric switch valve and a return pipe.

[0006] Preferably, a connecting and fixing layer is fixedly installed between the high-voltage switch cabinet and the execution cavity, and a middle channel is opened inside the connecting and fixing layer; a bottom vent hole communicating with the bottom end of the middle channel is opened at the bottom of the high-voltage switch cabinet, wherein the top end of the middle channel is connected to the end of the first electric switch valve away from the three-way pipe; a second electric switch valve is fixedly installed at the top of the high-voltage switch cabinet, and a humidity sensor is provided inside the second electric switch valve; a humidity sensor and a temperature sensor are provided inside the high-voltage switch cabinet.

[0007] Preferably, the top of the execution cavity is also fixedly connected to an exhaust port that communicates with the detection chamber. A one-way switch plate is movably installed at the end of the exhaust port away from the execution cavity via a hinge. The one-way switch plate overlaps with the end face of the exhaust port to form a one-way valve structure to prevent external media from entering the exhaust port.

[0008] Preferably, the end of the return pipe away from the tee pipe is connected to the top of the space where the evaporator is located in the execution chamber, and a sealing ring is fixed in the middle of the return pipe. Three guide centering slide rods arranged along their own axial direction are fixedly installed on the sealing ring. A sealing plate is slidably arranged between the three guide centering slide rods. The sealing plate contacts and seals with the edge of the middle hole of the guide centering slide rod. The two ends of the guide centering slide rods extend to the two sides of the sealing ring. Three elastic ropes are arranged on the side of the sealing ring away from the sealing plate. The two ends of each elastic rope are fixed to the guide centering slide rod and the sealing plate. The sealing plate is pulled tightly against the sealing ring by the elastic ropes.

[0009] Preferably, the execution cavity is provided with an external airflow inlet that communicates with the evaporator in the space where the execution cavity is located. A drive fan is rotatably installed at the external airflow inlet, and a filter screen is sleeved on the outside of the drive fan. The filter screen is fixed on the execution cavity.

[0010] Compared with the prior art, the present invention has the following beneficial effects: (1) It completely abandons high dielectric strength gases such as sulfur hexafluoride and instead uses dry air as the insulating medium. Through the gas dynamic replenishment component, the air is continuously dehumidified and the humidity is precisely controlled, so that the air maintains stable equivalent dielectric properties under various operating conditions. This avoids the strong greenhouse effect and complex recycling and treatment problems caused by traditional gases, significantly reduces the environmental impact of the equipment throughout its entire life cycle, and realizes an environmentally friendly high-voltage switchgear; (2) By setting up an evaporator, condenser, air pump, return pipe and multiple humidity sensors, the humidity of the air inside the cabinet is monitored in real time. When the humidity exceeds the standard, the system automatically starts to replenish dry air until the humidity returns to the qualified level, ensuring that the dielectric constant of the air inside the cabinet is stable for a long time, avoiding the risk of local electric field distortion and partial discharge caused by water vapor polar molecules, and greatly improving the efficiency of the switchgear. The reliability and safety of the air insulation system have been improved; (3) A horizontal sliding plate and a longitudinal sliding rod that can slide synchronously in the horizontal direction are set in the cabinet, and a local electric cylinder that can slide freely on the longitudinal sliding rod is used to make the docking position of the switch and the operating mechanism flexibly adjustable. During installation, the connection can be achieved precisely without fixing the dead position, which greatly improves the installation efficiency and alignment accuracy of the switch and reduces the installation difficulty; (4) When the temperature sensor in the cabinet detects that the temperature exceeds the standard, the system can automatically start the gas dynamic replenishment component, so that the dry air generates directional flow in the cabinet, actively heats the electrical components, and removes the trace amount of moisture that may accumulate. This solves the problem that traditional sealed gas-filled cabinets cannot effectively dissipate heat, avoids the aging acceleration of insulation materials and electrical components caused by high temperature, extends the overall service life of the equipment, and improves the operational reliability under high load or high temperature environment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the high-voltage switch cabinet structure of the present invention.

[0012] Figure 2 This is a diagram showing the installation position of the second electric switching valve of the present invention.

[0013] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0014] Figure 4 This is a schematic diagram of the internal structure of the high-voltage switch cabinet of the present invention.

[0015] Figure 5 This is a schematic diagram of the internal structure of the execution cavity of the present invention.

[0016] Figure 6 This is a diagram showing the installation positions of the evaporator and condenser of the present invention.

[0017] Figure 7 This is a schematic diagram of the internal structure of the reflux pipe of the present invention.

[0018] Figure 8 This is a schematic diagram of the intermediate channel structure of the present invention.

[0019] In the diagram: 101-High-voltage switch cabinet; 102-Inner frame; 103-Adjustable electric telescopic rod; 104-Horizontal sliding plate; 105-Switch mounting bracket; 106-Switch; 107-Partial electric cylinder; 108-Longitudinal sliding rod; 109-Sealing door panel; 201-Connecting fixing layer; 202-Intermediate channel; 203-Bottom vent; 204-Air pump; 205-First electric switch valve; 206-T-way pipe; 207-Actuating cavity; 208- 209-Evaporator; 210-External airflow inlet; 211-Drive fan; 212-Filter screen; 213-Baffle plate; 214-Detection chamber; 215-Water collection tank; 216-S-shaped water seal bend; 217-Second electric switch valve; 301-Return pipe; 302-Sealing ring; 303-Guide centering slide bar; 304-Sealing plate; 305-Elastic rope; 401-Exhaust pipe port; 402-One-way switch plate; 403-Hinge. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] Reference Figures 1-8As shown, this invention provides an environmentally friendly gas-insulated high-voltage switchgear, including a high-voltage switchgear body 101 with an internally fixed inner frame 102. Horizontal sliding plates 104 are slidably installed at the top and bottom of the inner frame 102 along the horizontal direction. Multiple parallel and vertically arranged longitudinal sliding rods 108 are fixedly installed between the two horizontal sliding plates 104. Adjustable electrically controlled telescopic rods 103 are movably installed at the edges of the top and bottom of the inner frame 102 facing the opening of the high-voltage switchgear body 101. The telescopic cylinder of the adjustable electrically controlled telescopic rod 103 is movably engaged with the inner frame 102, and the extension of the telescopic rod 103... The end of the telescopic rod is movably connected to the horizontal sliding plate 104. The two horizontal sliding plates 104 are synchronously displaced on the inner frame 102 by adjusting the electrically controlled telescopic rod 103. A sealing door plate 109 is movably installed on the side of the high-voltage switch cabinet 101. Sealing gaskets are provided on the contact surfaces of the sealing door plate 109 with the inner frame 102 and the high-voltage switch cabinet 101. A lock is provided on the sealing door plate 109 to form a fixed closed relationship between the sealing door plate 109 and the high-voltage switch cabinet 101. Multiple switch mounting brackets 105 are fixedly installed on the inner side of the inner frame 102. Each switch mounting bracket 105 can be fixed with [missing information]. Multiple switches 106 are provided, and each longitudinal slide rod 108 is rotatably and slidably fitted with the same number of local electric cylinders 107 as the switch mounting bracket 105. The local electric cylinders 107 are used to drive the contact heads on the switches 106, controlling the on / off state of the circuit where the switch 106 is located. The number of longitudinal slide rods 108 is the same as the number of switches 106 on each switch mounting bracket 105. The telescopic ends of all the local electric cylinders 107 on each longitudinal slide rod 108 are slidably fitted onto the longitudinal slide rod 108, allowing the local electric cylinders 107 to move freely on the longitudinal slide rod 108 for adaptation. The two switch mounting brackets 105 have different spacings; the side of the high-voltage switch cabinet 101 is also fixedly equipped with a gas dynamic replenishment component, which includes an execution chamber 207. A partition 213 is fixedly installed in the middle of the inner wall of the execution chamber 207. The partition 213 divides the inner wall of the execution chamber 207 into two spaces. The bottoms of the two spaces are connected to form a water collection pool 215. An evaporator 208 and a condenser 209 are fixedly installed in the two spaces inside the execution chamber 207, respectively. The bottom of the water collection pool 215 is connected to an S-shaped water seal bend pipe 216, and liquid water is reserved in the S-shaped water seal bend pipe 216. The condenser 209 has a detection chamber 214 reserved at the top of the space inside the execution chamber 207. The detection chamber 214 is equipped with a temperature sensor and a humidity sensor. The evaporator 208 is fixedly installed with a vibration generator to make the evaporator 208 vibrate. The connection between the evaporator 208 and the execution chamber 207 is fixed with elastic rubber.An air pump 204 is fixedly mounted on the top of the execution chamber 207. The air inlet of the air pump 204 is connected to the inside of the detection chamber 214, and the exhaust port of the air pump 204 is connected to a three-way pipe 206. The other two ports of the three-way pipe 206 are fixedly connected to a first electric switch valve 205 and a return pipe 301, respectively. A connecting and fixing layer 201 is fixedly installed between the high-voltage switch cabinet 101 and the execution chamber 207. A middle channel 202 is opened inside the connecting and fixing layer 201. A bottom vent 203 is opened at the bottom of the high-voltage switch cabinet 101, which is connected to the bottom end of the middle channel 202. The top end of the middle channel 202 is connected to the end of the first electric switch valve 205 away from the three-way pipe 206. A second electric switch valve 217 is fixedly installed on the top of the high-voltage switch cabinet 101. A humidity sensor is installed inside the second electric switch valve 217. A humidity sensor and a temperature sensor are installed inside the high-voltage switch cabinet 101.

[0022] The top of the execution chamber 207 is also fixedly connected to an exhaust port 401 that communicates with the detection chamber 214. At the end of the exhaust port 401 away from the execution chamber 207, a one-way switch plate 402 is movably installed via a hinge 403. The one-way switch plate 402 overlaps with the end face of the exhaust port 401 to form a one-way valve structure, preventing external media from entering the exhaust port 401. One end of the return pipe 301 away from the three-way pipe 206 is connected to the top of the space where the evaporator 208 is located in the execution chamber 207. A sealing ring 302 is fixed in the middle of the interior of the return pipe 301. Three guide centering slide rods 303 arranged along their own axial direction are fixedly installed on the sealing ring 302. A sealing plate 304 is slidably arranged between the three guide centering slide rods 303. The sealing plate 304 contacts and seals with the edge of the middle hole of the guide centering slide rod 303. The two ends of the guide centering slide rod 303 extend to the two sides of the sealing ring 302. Three elastic ropes 305 are arranged on the side of the sealing ring 302 away from the sealing plate 304. The two ends of each elastic rope 305 are fixed to the guide centering slide rod 303 and the sealing plate 304. The elastic ropes 305 pull the sealing plate 304 to fit tightly against the sealing ring 302. An external airflow inlet 210 is provided on the execution chamber 207, which communicates with the evaporator 208 in the space where the execution chamber 207 is located. A drive fan 211 is rotatably installed at the external airflow inlet 210. A filter screen 212 is sleeved on the outside of the drive fan 211 and is fixed on the execution chamber 207.

[0023] According to the power distribution requirements, a corresponding number of switches 106 are installed in the high-voltage switch cabinet 101. Then, the electric telescopic rod 103 is controlled and adjusted. The telescopic rod of the electric telescopic rod 103 moves the longitudinal slide rod 108 on the horizontal sliding plate 104 to a position close to the switch 106. Then, the end of the telescopic rod of the local electric cylinder 107 is movably connected to the contact head of the switch 106 (both have through holes and are connected by pins). Since the local electric cylinder 107 can move freely on the longitudinal slide rod 108, the position of the local electric cylinder 107 can be adjusted arbitrarily to facilitate the connection between the contact head of the switch 106 and the local electric cylinder 107. After the switches 106 and the local electric cylinder 107 are installed, the sealing door 109 is closed and locked to the high-voltage switch cabinet 101. At this time, the inside of the high-voltage switch cabinet 101 is a sealed space (the second electric switch valve 217 and the first electric switch valve 205 are both in the closed state). Before use, the first electric switch valve 205, the drive fan 211, and the second electric switch valve 217 need to be activated simultaneously. The drive fan 211 rotates, driving external air through the filter screen 212 and the external airflow inlet 210 into the space within the evaporator 208 and the execution chamber 207. The filter screen 212 is activated to filter impurities in the air. When the air enters the evaporator 208 (the evaporator 208 and condenser 209 are connected to the compressor, and the compressor is in operation), the evaporator 208 will have sufficient contact with the air, thereby condensing the moisture in the air onto the surface of the evaporator 208. With the help of the vibration generator, the condensate adhering to the surface of the evaporator 208 will fall into the water collection tank 215. After passing through the evaporator 208, the air will have reduced moisture content, thereby improving the dryness of the air. (It should be noted that: the larger the dielectric constant, the easier it is to form a reverse electric field inside the medium; the more the electric field is weakened in the medium; similarly...) Under voltage, the electric field strength is lower; that is, a low dielectric constant results in a sharp, easily concentrated electric field, leading to easy breakdown; a high dielectric constant results in a more uniform electric field distribution, leading to more stable insulation. Therefore, by increasing or stabilizing the equivalent dielectric constant of the insulating medium, the degree of local electric field distortion can be reduced. Air humidity is essentially the volume fraction or partial pressure of water vapor molecules in the air. Water molecules (H2O) have a very important characteristic: they are strongly polar molecules. Dry air's main components are: N2 and O2 – nonpolar molecules; water vapor: H2O – strongly dipole moment polar molecules. In an electric field: nonpolar molecules can only undergo very weak induced polarization; polar molecules undergo oriented polarization, rapidly rotating and aligning along the electric field direction. This means that even a low water vapor content can significantly alter the overall polarization behavior of the air. The relationship between humidity and air dielectric constant is: increased air humidity – increased number of water vapor molecules – enhanced polarization ability – increased equivalent dielectric constant of air; dry air: ε r ≈1.0005; Moist air: ε r=1.0005+Δε (Δε is related to the partial pressure of water vapor). Although the numerical change is small, the non-uniformity of its spatial distribution in high-voltage equipment has a significant impact on the electric field. The humidity of the air inside the high-voltage switchgear 101 is not uniform, and the temperature, electric field, and gas flow are also uneven. This leads to localized enrichment of water vapor, especially on the cold walls, in areas of electric field distortion, and near the pointed electrodes of the high-voltage switchgear 101. When the local dielectric constant increases, the electric field lines are bent and attracted, and the electric field strength in adjacent areas is actually increased. The result is an exacerbation of electric field distortion, rather than a reduction. This is why humid air is not safer; on the contrary, it is more likely to induce partial discharge, surface discharge, and micro-arcs. More importantly, the ionization-promoting effect of water molecules: under a high-voltage electric field, water molecules are easily ionized, dissociated, and participate in electron collision processes. As a result, the electron free path is shortened, electron multiplication is more likely to occur, and the breakdown voltage is significantly reduced. Therefore, the insulation performance of humid air is far lower than that of dry air at the same pressure. Because in a high-voltage switchgear cabinet 101 where air is used as the insulating medium, air humidity not only affects the magnitude of the dielectric constant but also causes electric field distortion and partial discharge risks due to uneven spatial distribution and differences in polarization behavior. Therefore, this invention does not simply reduce air humidity but uses a humidity control device to maintain the long-term stability of the air's dielectric properties, thereby ensuring the reliability of the insulation performance inside the high-voltage switchgear cabinet 101. Increased air humidity, due to the participation of polar water vapor molecules, causes changes in the air's dielectric constant, leading to dielectric performance degradation and partial discharge risks in a high-voltage non-uniform electric field. Therefore, it is necessary to regulate air humidity with the goal of stabilizing dielectric performance.

[0024] Air passes through evaporator 208, and then the dry, cool air passes through condenser 209, thus dissipating heat from condenser 209. The dry air then enters detection chamber 214. Air pump 204 is activated, drawing air from detection chamber 214 through its inlet. Before air pump 204 starts, air is discharged through exhaust port 401. One-way switch plate 402 on exhaust port 401 is pushed open by air pressure (the hinge 403 is located at the top of exhaust port 401, so that under gravity, one-way switch plate 402 will naturally close on the end face of exhaust port 401; the end face of exhaust port 401 must be vertically oriented). Air pump 204 draws in gas and discharges it into three-way pipe 206. With both the first electric switch valve 205 and the second electric switch valve 217 open, the gas preferentially flows through three-way pipe 206 and passes through the first electric switch valve 205. It then enters the bottom of the high-voltage switch cabinet 101 through the intermediate channel 202 and the bottom vent 203, finally exiting through the second electric switch valve 217. When both the humidity sensor in the second electric switch valve 217 and the humidity sensor in the high-voltage switch cabinet 101 detect acceptable humidity levels, the first electric switch valve 205 and the second electric switch valve 217 are closed, creating a dry, sealed space inside the high-voltage switch cabinet 101. Air treated by evaporator 208 enters the high-voltage switch cabinet 101, acting as an insulating medium surrounding the switch 106 and other electrical control devices. Finally, it enters a standby detection state (only the humidity and temperature sensors are operational).

[0025] During this process, the humidity sensor installed in the detection chamber 214 continuously monitors the humidity of the air passing through the first electric switch valve 205. When the humidity is below the standard, the first electric switch valve 205 closes (the second electric switch valve 217 closes simultaneously). After the first electric switch valve 205 closes, the air pressure inside the three-way pipe 206 increases. At this time, the gas pushes the sealing plate 304 and the sealing ring 302 to separate, and the elastic rope 305 is stretched. This gas then flows through the return pipe 301 to the space in the execution chamber 207 where the evaporator 208 is located, and is dried and condensed again by the evaporator 208 until the humidity sensor in a single detection chamber 214 detects that the humidity is within the standard range. Then, the first electric switch valve 205 and the second electric switch valve 217 open simultaneously again. In addition, when the temperature sensor installed in the high-voltage switch cabinet 101 detects that the temperature inside the high-voltage switch cabinet 101 exceeds the standard, the above process is also initiated to generate flowing air inside the high-voltage switch cabinet 101, thereby dissipating heat from the inside of the high-voltage switch cabinet 101. This solves the problem of heat dissipation in traditional equipment, and uses dry air instead of high dielectric strength gases such as sulfur hexafluoride (whose insulation performance mainly depends on the physical properties of the gas itself, resulting in a strong greenhouse effect and complex recycling and processing). This eliminates reliance on the high dielectric gas itself, and instead, through the coordinated control of air humidity and dielectric properties, maintains a stable equivalent dielectric safety margin under different operating conditions, fundamentally changing the way insulation systems are constructed.

Claims

1. An environmentally friendly gas-insulated high-voltage switchgear, characterized in that: The high voltage switch cabinet (101) includes an inner frame (102) fixedly installed inside. The top and bottom of the inner frame (102) are both slidably installed with horizontal sliding plates (104) in the horizontal direction. Multiple parallel and vertically arranged longitudinal sliding rods (108) are fixedly installed between the two horizontal sliding plates (104). Multiple switch mounting brackets (105) are fixedly installed on the inner side of the inner frame (102). Multiple switches (106) can be fixed on each switch mounting bracket (105). Each longitudinal slide bar (108) is rotatably and slidably fitted with the same number of local electric cylinders (107) as the switch mounting bracket (105). The local electric cylinders (107) are used to drive the contact head on the switch (106) to move. The side of the high-voltage switch cabinet (101) is also fixedly equipped with a gas dynamic replenishment component. The gas dynamic replenishment component includes an execution chamber (207). A partition (213) is fixedly installed in the middle of the inner wall of the execution chamber (207). The partition (213) divides the inner wall of the execution chamber (207) into two spaces. The bottom of the two spaces are connected to form a water collection pool (215). An evaporator (208) and a condenser (209) are fixedly installed in the two spaces inside the execution chamber (207). The bottom of the water collection pool (215) is connected to an S-shaped water seal bend pipe (216). Liquid water is reserved in the S-shaped water seal bend pipe (216).

2. The environmentally friendly gas-insulated high-voltage switchgear according to claim 1, characterized in that: The condenser (209) has a detection chamber (214) reserved at the top of the space inside the execution chamber (207). The detection chamber (214) is equipped with a temperature sensor and a humidity sensor. A vibration generator is fixedly installed on the evaporator (208) to make the evaporator (208) vibrate.

3. The environmentally friendly gas-insulated high-voltage switchgear according to claim 2, characterized in that: An air pump (204) is fixedly installed on the top of the execution chamber (207). The air inlet of the air pump (204) is connected to the inside of the detection chamber (214). The exhaust port of the air pump (204) is connected to a three-way pipe (206). The other two ports of the three-way pipe (206) are fixedly connected to the first electric switch valve (205) and the return pipe (301), respectively.

4. The environmentally friendly gas-insulated high-voltage switchgear according to claim 3, characterized in that: A connecting and fixing layer (201) is fixedly installed between the high-voltage switch cabinet (101) and the execution cavity (207), and an intermediate channel (202) is opened inside the connecting and fixing layer (201); a bottom vent hole (203) is opened at the bottom of the high-voltage switch cabinet (101) and communicates with the bottom end of the intermediate channel (202), wherein the top end of the intermediate channel (202) is connected to the end of the first electric switch valve (205) away from the three-way pipe (206); a second electric switch valve (217) is fixedly installed at the top of the high-voltage switch cabinet (101).

5. The environmentally friendly gas-insulated high-voltage switchgear according to claim 4, characterized in that: The top of the execution cavity (207) is also fixedly connected to an exhaust port (401) that communicates with the detection chamber (214). A one-way switch plate (402) is movably installed at the end of the exhaust port (401) away from the execution cavity (207) via a hinge (403). The one-way switch plate (402) overlaps and cooperates with the end face of the exhaust port (401).

6. The environmentally friendly gas-insulated high-voltage switchgear according to claim 5, characterized in that: The end of the return pipe (301) away from the three-way pipe (206) is connected to the top of the space where the evaporator (208) is located in the execution chamber (207). A sealing ring (302) is fixed in the middle of the return pipe (301). Three guide centering slides (303) arranged along their own axial direction are fixedly installed on the sealing ring (302). A sealing plate (304) is slidably arranged between the three guide centering slides (303). The sealing plate (304) contacts and seals with the edge of the middle hole of the guide centering slide (303). The two ends of the guide centering slide (303) extend to the two sides of the sealing ring (302). Three elastic ropes (305) are arranged on the side of the sealing ring (302) away from the sealing plate (304). The two ends of each elastic rope (305) are fixed to the guide centering slide (303) and the sealing plate (304).

7. The environmentally friendly gas-insulated high-voltage switchgear according to claim 6, characterized in that: An external airflow inlet (210) is provided on the execution cavity (207) and communicates with the evaporator (208) in the space where the execution cavity (207) is located. A drive fan (211) is rotatably installed at the external airflow inlet (210). A filter screen (212) is sleeved on the outside of the drive fan (211) and the filter screen (212) is fixed on the execution cavity (207).

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