High-voltage environment-friendly cabinet with width of 350 mm

Abstract

The invention discloses a 350mm-wide high-voltage environment-friendly cabinet which comprises a 350mm-wide cabinet body, a mechanism compartment, a switch air chamber, a cable compartment, an environment-friendly isolation mechanism, an environment-friendly circuit breaker mechanism, an air pressure adjusting mechanism, a side edge expansion connector, an environment-friendly upper isolation circuit breaker switch and a wire outlet sleeve. The air pressure adjusting mechanism comprises an air supply structure, an exhaust structure and a switching structure, wherein the air supply structure conveys SF6 / N2 mixed gas in a ratio of 4: 6 through a micro air pump; the exhaust structure realizes toxicant decomposition and SF6 recovery through four-stage filtration; the switching structure adopts the design that a water-drop-shaped partition plate is matched with double air channels, and a servo motor drives a sector gear to accurately control the opening and closing angle; air pressure self-balancing, zero-pollution emission and sealing protection are achieved through the ultra-narrow width, and the device is suitable for upgrading and reconstruction of a high-density urban power distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection cabinets, in particular to a 350mm wide high-voltage environmental protection cabinet. Background Art

[0002] An environmental protection cabinet is an electrical device that consists of a group of high-voltage switchgear installed in a metal or non-metallic insulating cabinet or made into an assembled interval ring network power supply unit. Its core part uses load switches and fuses, which has the advantages of improving power supply parameters and performance as well as power supply safety.

[0003] At present, China's patent application number: CN202022866480.3 discloses an environmental protection cabinet, including an environmental protection cabinet body, a cable room is provided inside the environmental protection cabinet body, and the front, rear and right three sides of the cable room are tightly attached to and fixed to the corresponding side walls of the environmental protection cabinet body by bolts. A "C"-shaped cavity is formed between the cable room and the upper and lower left sides of the environmental protection cabinet body. The upper and lower ends of the "C"-shaped cavity are respectively provided with a heat dissipation outlet and a heat dissipation inlet. An exhaust fan is provided in the heat dissipation outlet, and the heat dissipation inlet includes a controller that controls the exhaust fan, the exhaust fan and the heating wire to turn on by signals from the exhaust fan and the heating wire.

[0004] However, the high-voltage environmental protection cabinets in the existing technology generally have a width of more than 600mm due to their loose structure, which makes them inconvenient to adapt to compact urban distribution rooms. In addition, the control of air pressure usually relies on an external air source and independent exhaust equipment, which has a slow response when replenishing air, and frequent operations can easily cause air pressure fluctuations. During exhaust, purification treatment is usually not performed, and the decomposition products of SF6 are directly leaked, which can easily pollute the environment. Summary of the Invention

[0005] The object of the present invention is to provide a 350mm wide high-voltage environmental protection cabinet to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a 350mm wide high-voltage environmental protection cabinet, comprising a 350mm wide cabinet, a mechanism compartment, a switch gas chamber, a cable compartment, an environmental protection isolation mechanism, an environmental protection circuit breaker mechanism, an air pressure regulating mechanism, a side extension connection, an environmental protection upper isolation circuit breaker switch and an outlet bushing, a mechanism compartment is provided on the right side of the upper layer inside the 350mm wide cabinet, a switch gas chamber is connected to the left side of the mechanism compartment, a cable compartment is provided on the lower layer inside the 350mm wide cabinet, the left and right sides of the top of the cable compartment are respectively connected to the switch gas chamber and the mechanism compartment, and the connection between the cable compartment and the switch gas chamber is stepped, and the environmental protection isolation mechanism and the environmental protection are installed in layers on the upper and lower parts of the mechanism compartment. Circuit breaker mechanism, an air pressure regulating mechanism is installed on the lower rear side wall of the switch air chamber, and a side extension connection, an environmentally friendly upper isolating circuit breaker switch and an outlet bushing are arranged from top to bottom on the middle side of the switch air chamber. The environmentally friendly circuit breaker mechanism drives the moving contact of the environmentally friendly upper isolating circuit breaker switch through the transmission shaft. The outlet bushing passes through the stepped interior on the top side of the cable compartment. The bottom of the air pressure regulating mechanism passes through the top of the cable compartment and then passes out from the rear side wall of the cable compartment. The air pressure regulating mechanism includes an air supply structure fastened to the rear side wall of the switch air chamber, an exhaust structure fastened to the bottom side of the air supply structure, and a switching structure connected to the left sides of the air supply structure and the exhaust structure respectively. The switching structure is located on the lower middle side of the switch air chamber.

[0007] Preferably, the air supply structure includes a hopper cover fastened to the switch air chamber on the rear side, an inflation tube fixedly connected to the right side of the top of the hopper cover, a first one-way valve arranged on the bottom side of the inflation tube, a mixed gas filled in the hopper cover, an air pressure sensor installed on the upper left side of the interior of the hopper cover, a protective cover embedded in the lower left side of the interior of the hopper cover, and a micro air pump fastened to the bottom side of the interior of the protective cover, the right air inlet of the micro air pump is connected to the interior of the hopper cover, and the left air outlet of the micro air pump is located at the bottom of the left side wall of the hopper cover, and the air outlet is connected to the switching structure.

[0008] Preferably, the mixed gas is a mixture of SF6 and N2 in a ratio of 4:6.

[0009] Preferably, the exhaust structure includes a rectangular seat whose top side is fastened to the air supply structure, a metal sintered filter element, a composite membrane, a molecular sieve recovery membrane and an activated carbon adsorption membrane arranged in sequence inside the rectangular seat from left to right, a connecting pipe embedded in the left side wall of the rectangular seat, a UV lamp embedded in the bottom side of the rectangular seat, an exhaust pipe fixed to the right side of the bottom of the rectangular seat, and a second one-way valve connected to the top side of the exhaust pipe. The left side of the connecting pipe is inserted and connected to the switching structure, and the bottom of the exhaust pipe passes through the top of the cable compartment and then out of the rear wall of the cable compartment. The UV lamp is located below the composite membrane.

[0010] Preferably, the composite membrane is a PTFE / ceramic composite membrane, and the molecular sieve recovery membrane is a graphene-based sieve membrane.

[0011] Preferably, the surface of the composite film is coated with a nano-TiO2 thin film by a sol-gel method.

[0012] Preferably, the switching structure includes a warehouse seat whose upper and lower parts on the right side are respectively connected to the air supply structure and the exhaust structure. The interior of the warehouse seat is hollow, and a pad is fixedly connected to the right side of the interior of the warehouse seat. A first air duct and a second air duct are formed on the upper and lower sides of the pad, respectively. A positioning component is fastened to the rear side of the warehouse seat, and the front side of the positioning component rotates through the rear side wall of the warehouse seat, and a switching partition is connected to the front end of the positioning component. A solenoid valve is embedded in the hollow left side of the interior of the warehouse seat, the right side of the first air duct is connected to the air supply structure, and the right side of the second air duct is connected to the exhaust structure, and the switching partition is arranged on the left side of the pad.

[0013] Preferably, the left side of the pad is arc-shaped, and a sealing plate in contact with the switching partition is provided at the arc shape. The switching partition is in the shape of a water drop. When the switching partition is rotated to the bottom, the left side of the bottom of the switching partition is in contact with the lower inner part of the warehouse seat. When the switching partition is rotated to the top, the left side of the top of the switching partition is in contact with the upper inner part of the warehouse seat.

[0014] Preferably, the positioning assembly includes a sleeve whose front side is fastened to the bin seat, a servo motor locked and fixed to the right side of the top of the sleeve, a cover wrapped around the outside of the servo motor, a screw connected to the bottom output end of the servo motor, an internally threaded gear sleeve threadedly connected to the outer surface of the screw, and a fan gear meshing and transmitting on the left side of the internally threaded gear sleeve, the bottom of the screw is rotatably connected to the bottom side of the sleeve, and the top of the screw rotates through the inside of the top of the sleeve, the middle part of the rear side of the fan gear is rotatably connected to the sleeve, a rotating rod is provided at the front rotating shaft of the fan gear, and the front end of the rotating rod is connected to the switching partition.

[0015] Preferably, a sliding groove is provided on the right inner wall of the sleeve, and the right side of the internally threaded gear sleeve is inserted and slid inside the sliding groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes modular integration of high-voltage components in a limited space through the partition design formed by the mechanism compartment, switch air chamber and cable compartment of the 350mm ultra-narrow cabinet. The stepped connection structure optimizes the connection path between the outlet bushing and the cable compartment. Combined with the integrated air supply and exhaust design of the compact air pressure regulating mechanism, the space utilization rate of the distribution room is significantly improved. The functional divisions inside the cabinet are clear, taking into account both operational convenience and equipment safety.

[0017] The present invention realizes efficient purification of harmful gases and recovery of SF6 and avoids leakage of toxic substances through the four-stage filtration system formed by the metal sintered filter element, photocatalytic composite membrane, molecular sieve recovery membrane and activated carbon adsorption membrane of the air pressure regulating mechanism; the redundant design of the teardrop-shaped switching partition and the solenoid valve greatly reduces the risk of gas leakage through the curved surface sealing structure; the intelligent switching mechanism of the air replenishment and exhaust functions ensures the dynamic balance of pressure in the switch air chamber and guarantees the long-term stable operation of the equipment.

[0018] The edge expansion connection interface of the present invention supports the rapid plug-in expansion of adjacent cabinets, the UV photocatalytic self-cleaning system reduces the need for filter membrane maintenance, and the servo motor-driven switching partition achieves precise angle control. The entire solution significantly reduces the complexity of operation and maintenance through structural innovation and functional collaboration, and is suitable for the upgrade needs of high-density urban power grids. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of the structure of the air pressure regulating mechanism of the present invention; Figure 3 Schematic diagram of the structure of the gas replenishing structure of the present invention; Figure 4 It is a structural schematic diagram of the exhaust structure of the present invention; Figure 5 It is a structural schematic diagram of the switching structure of the present invention; Figure 6 It is a structural schematic diagram of the position adjustment component of the present invention.

[0020] Figure: 350mm wide cabinet 1, mechanism compartment 2, switch air chamber 3, cable compartment 4, environmental isolation mechanism 5, environmental circuit breaker mechanism 6, air pressure regulating mechanism 7, side extension connection 8, environmental upper isolation circuit breaker switch 9, outlet bushing 10, air supply structure 71, exhaust structure 72, switching structure 73, chamber cover 711, charging pipe 712, first non-return valve 713, mixed gas 714, air pressure sensor 715, protective cover 716, micro air pump 717, rectangular seat 721, metal The components include sintered filter element 722, composite membrane 723, molecular sieve recovery membrane 724, activated carbon adsorption membrane 725, connecting pipe 726, UV lamp 727, exhaust pipe 728, second one-way valve 729, chamber seat 731, spacer 732, first air duct 733, second air duct 734, adjustment assembly 735, switching partition 736, solenoid valve 737, sleeve 7351, servo motor 7352, cover 7353, screw 7354, internal threaded gear sleeve 7355, and sector gear 7356. DETAILED DESCRIPTION

[0021] In order to further explain the technical solution of the present invention, specific embodiments are described in detail below.

[0022] See also Figure 1 The present invention provides a 350mm wide high-voltage environmental protection cabinet, comprising a 350mm wide cabinet body 1, a mechanism compartment 2, a switch gas chamber 3, a cable compartment 4, an environmental protection isolation mechanism 5, an environmental protection circuit breaker mechanism 6, an air pressure regulating mechanism 7, a side extension connection 8, an environmental protection upper isolation circuit breaker switch 9 and an outlet bushing 10. The mechanism compartment 2 is arranged on the right side of the upper layer inside the 350mm wide cabinet body 1, and the switch gas chamber 3 is connected to the left side of the mechanism compartment 2. The cable compartment 4 is arranged on the lower layer inside the 350mm wide cabinet body 1. The left and right sides of the top of the cable compartment 4 are respectively connected to the switch gas chamber 3 and the mechanism compartment 2, and the connection between the cable compartment 4 and the switch gas chamber 3 is stepped. The environmental protection isolation mechanism 5 and the environmental protection circuit breaker mechanism 6 are installed in the upper and lower layers inside the mechanism compartment 2. The modular layered design improves the convenience of component maintenance. The switch gas chamber 3 is installed on the lower rear side wall. The air pressure regulating mechanism 7 is installed downwardly to facilitate the layout of the gas pipeline, reduce the number of openings in the high-voltage area to maintain air tightness, and a side extension connection 8, an environmentally friendly upper isolating circuit breaker switch 9 and an outlet bushing 10 are arranged from top to bottom on the middle side of the switch chamber 3. The environmentally friendly circuit breaker mechanism 6 drives the moving contact of the environmentally friendly upper isolating circuit breaker switch 9 through the transmission shaft. The mechanical direct drive structure improves the opening and closing response speed and reduces the complexity of electrical control. The outlet bushing 10 passes through the stepped interior arranged on the top side of the cable compartment 4. The travel path of the high-voltage outlet bushing 10 is shortened through the stepped connection structure, thereby enhancing insulation reliability and saving longitudinal space. The bottom of the air pressure regulating mechanism 7 passes through the top of the cable compartment 4 and then passes out from the rear side wall of the cable compartment 4, so as to realize the integrated function of air supply and exhaust through the air pressure regulating mechanism 7, taking into account the ultra-narrow cabinet space limitation and air pressure control efficiency.

[0023] See also Figure 1 and Figure 2 The present invention provides a 350mm wide high-voltage environmental protection cabinet. The air pressure regulating mechanism 7 includes an air supply structure 71 fastened to the rear side wall of the switch air chamber 3, an exhaust structure 72 fastened to the bottom side of the air supply structure 71, and a switching structure 73 connected to the left sides of the air supply structure 71 and the exhaust structure 72 respectively. The switching structure 73 is located in the lower middle side of the switch air chamber 3. The three-module integrated design realizes the integration of air supply / exhaust functions and reduces the risk of leakage at external connection nodes.

[0024] See also Figure 2 and Figure 3The present invention provides a 350mm wide high-voltage environmental protection cabinet, the gas supply structure 71 includes a hopper cover 711 fastened to the switch gas chamber 3 at the rear side, an air filling pipe 712 fixedly connected to the top right side of the hopper cover 711, a first one-way valve 713 arranged on the bottom side of the air filling pipe 712, and gas can be added to the hopper cover 711 through the air filling pipe 712, a mixed gas 714 filled in the hopper cover 711, an air pressure sensor 715 installed on the upper left side of the hopper cover 711, a protective cover 716 embedded in the lower left side of the hopper cover 711, and a valve 713 fastened to the protective cover 716. The micro air pump 717 on the bottom side and the compact chamber cover 711 integrate gas storage, monitoring and pumping functions to meet the space limitations of the ultra-narrow cabinet. The right air inlet of the micro air pump 717 is connected to the inside of the chamber cover 711, and the left air outlet of the micro air pump 717 is located at the bottom of the left side wall of the chamber cover 711. The air outlet is connected to the switching structure 73. The short-distance gas path connection reduces gas transmission loss and improves gas replenishment efficiency. The mixed gas 714 is a mixture of SF6 and N2 in a ratio of 4:6, which optimizes the balance between insulation strength and environmental protection and reduces the use of greenhouse gases.

[0025] See also Figure 2 and Figure 4 The present invention provides a 350mm wide high-voltage environmental protection cabinet. The exhaust structure 72 includes a rectangular seat 721 whose top side is fastened to the air supply structure 71. From left to right, a metal sintered filter element 722, a composite membrane 723, a molecular sieve recovery membrane 724, and an activated carbon adsorption membrane 725 are sequentially arranged inside the rectangular seat 721. The four-stage filtration system realizes the full-process purification of solid particle interception, toxic substance decomposition, SF6 recovery, and residual adsorption. The exhaust structure 722 includes a pipe 726 embedded in the left wall of the rectangular seat 721, a UV lamp 727 embedded in the bottom side of the rectangular seat 721, an exhaust pipe 728 fixed to the right side of the bottom of the rectangular seat 721, and a second one-way valve 729 connected to the top side of the exhaust pipe 728. The UV lamp 727 triggers photocatalytic self-cleaning and prevents external pollutants from flowing back through the second one-way valve 729. The left side of the connecting pipe 726 is inserted and connected to the inside of the switching structure 73. The bottom of the exhaust pipe 728 passes through the top of the cable compartment 4 and then passes through the rear side wall of the cable compartment 4 to discharge the gas to the outside. The UV lamp 727 is located below the composite membrane 723. The composite membrane 723 is a PTFE / ceramic composite membrane. The molecular sieve recovery membrane 724 is a graphene-based sieve membrane. The surface of the composite membrane 723 is coated with a nano-TiO2 film using a sol-gel method. The TiO2 film decomposes toxic gases into harmless salts under the irradiation of the UV lamp 727. The molecular sieve recovery membrane 724 realizes high-precision recovery of SF6.

[0026] See also Figure 2 、 Figure 5 and Figure 6The present invention provides a 350mm wide high-pressure environmental protection cabinet. The switching structure 73 includes a warehouse seat 731 connected to the air supply structure 71 and the exhaust structure 72 at the upper and lower parts of the right side respectively. The interior of the warehouse seat 731 is hollow, and a pad 732 is fixedly connected to the right side of the interior of the warehouse seat 731. The hollow warehouse body reduces the air flow resistance, and the pad 732 provides a sealing support surface. A first air channel 733 and a second air channel 734 are formed on the upper and lower sides of the pad 732 respectively. The dual air channel design realizes the physical isolation of the air supply / exhaust path to prevent gas cross contamination. A positioning component 735 is fastened to the rear side of the warehouse seat 731. The front side of the positioning component 735 rotates through the rear side wall of the warehouse seat 731, and a switching partition 736 is connected to the front end of the positioning component 735 to switch and adjust the state of the switching partition 736 through the positioning component 735. The solenoid valve 737 is embedded on the left side of the shape. The solenoid valve 737 is used to forcibly cut off the air path and serves as the first-stage switch of the air flow channel to improve the sealing effect when the air pressure is not adjusted. The right side of the first air channel 733 is connected to the air supply structure 71, and the right side of the second air channel 734 is connected to the exhaust structure 72. The switching partition 736 is arranged on the left side of the pad 732. The left side of the pad 732 is arc-shaped, and a sealing sheet in contact with the switching partition 736 is provided at the arc shape. The curved sealing structure enhances airtightness. The switching partition 736 is in the shape of a water drop. When the switching partition 736 rotates to the bottom, the left side of the bottom of the switching partition 736 contacts the lower inner part of the warehouse seat 731. When the switching partition 736 rotates to the top, the left side of the top of the switching partition 736 contacts the upper inner part of the warehouse seat 731. The water drop-shaped contour realizes full-angle fitting sealing, reducing the gas leakage rate.

[0027] Among them, the positioning component 735 includes a sleeve 7351 fastened to the warehouse seat 731 on the front side, a servo motor 7352 locked and fixed to the top right side of the sleeve 7351, and a cover 7353 wrapped around the outside of the servo motor 7352. The fully enclosed cover 7353 protects against electromagnetic interference of the switch arc on the servo motor 7352, a screw 7354 connected to the output end at the bottom of the servo motor 7352, an internally threaded gear sleeve 7355 threadedly connected to the outer surface of the screw 7354, and a fan gear 7356 meshing with the left side of the internally threaded gear sleeve 7355. The secondary transmission of the screw 7354 and the fan gear 7356 converts rotational motion into precise angle control. The bottom of the rod 7354 is rotatably connected to the bottom side of the sleeve 7351, and the top of the screw 7354 passes through and rotates on the inside of the top of the sleeve 7351 to ensure the stability of the rotation of the screw 7354. The middle part of the rear side of the fan gear 7356 is rotatably connected to the sleeve 7351. A rotating rod is provided at the front rotating shaft of the fan gear 7356. The front end of the rotating rod is connected to the switching partition 736 to rotate the switching partition 736 through the rotating rod, thereby realizing the control of the angle of the switching partition 736. A sliding groove is opened on the right wall of the sleeve 7351, and the right side of the internal threaded gear sleeve 7355 is inserted and slides inside the sliding groove to ensure the stability of the sliding position of the internal threaded gear sleeve 7355.

[0028] The present invention provides a 350mm wide high-voltage environmental protection cabinet, the working principle of which is as follows: First, safety interlock and operation control: When the high-voltage live display detects that the switch chamber 3 or the outlet bushing 10 is energized, the passive electromagnetic lock on the 350mm wide cabinet 1 is triggered to lock the grounding operation hole. At the same time, the gas pressure sensor in the switch chamber 3 monitors the pressure of the switch chamber 3 in real time. In the event of an abnormality, the locking system is linked, and the environmental protection circuit breaker mechanism 6 drives the moving contact of the environmental protection upper isolation circuit breaker switch 9 through the transmission shaft to complete the opening and closing operations; Second, dynamic regulation of air pressure: When the air pressure in the switch air chamber 3 is insufficient, the teardrop-shaped switching baffle 736 of the switching structure 73 is driven and controlled by the servo motor 7352 to rotate the switching baffle 736 to the bottom side and contact the lower inner part of the storage seat 731, and then the solenoid valve 737 is opened to connect the first air channel 733 with the interior of the switch air chamber 3, and the SF6 / N2 mixed gas 714 is pumped into the switch air chamber 3 through the micro air pump 717 of the air supply structure 71; when the air pressure is too high, the teardrop-shaped switching baffle 736 of the switching structure 73 rotates to the top side and contacts the upper inner part of the storage seat 731, so that the second air channel 734 is connected with the interior of the switch air chamber 3. The gas in the switch air chamber 3 passes through the metal sintered filter element 722 to intercept particles, the TiO2 photocatalytic composite membrane 723 to decompose toxic substances, the molecular sieve recovery membrane 724 to recover SF6, and the activated carbon adsorption membrane 725 to purify residues, and is finally safely discharged through the exhaust pipe 728.

[0029] 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 aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A 350mm wide high-voltage environmental protection cabinet, characterized by: The invention comprises a 350mm wide cabinet (1), wherein a mechanism compartment (2) is provided on the right side of the upper layer inside the 350mm wide cabinet (1), and a switch air chamber (3) is connected to the left side of the mechanism compartment (2), and a cable compartment (4) is provided on the lower layer inside the 350mm wide cabinet (1), and the left and right sides of the top of the cable compartment (4) are respectively connected to the switch air chamber (3) and the mechanism compartment (2), and the connection between the cable compartment (4) and the switch air chamber (3) is in a stepped shape, and an environmental protection isolation mechanism (5) and an environmental protection circuit breaker mechanism (6) are installed in the upper and lower layers inside the mechanism compartment (2), and an air pressure regulating mechanism (7) is installed on the rear lower side wall inside the switch air chamber (3), and a side expansion connection (8), a ring connection (9) and a pressure regulating mechanism (10) are provided on the middle side of the switch air chamber (3) from top to bottom. The upper isolating circuit breaker switch (9) and the outlet bushing (10) are provided. The environmental protection circuit breaker mechanism (6) drives the movable contact of the upper isolating circuit breaker switch (9) through the transmission shaft. The outlet bushing (10) passes through the stepped interior of the top side of the cable compartment (4). The bottom of the air pressure regulating mechanism (7) passes through the top of the cable compartment (4) and then passes through the rear side wall of the cable compartment (4). The air pressure regulating mechanism (7) includes an air supply structure (71) fastened to the rear side wall of the switch air chamber (3), an exhaust structure (72) fastened to the bottom side of the air supply structure (71), and a switching structure (73) connected to the left sides of the air supply structure (71) and the exhaust structure (72), respectively. The switching structure (73) is located in the lower middle side of the switch air chamber (3).

2. The 350mm wide high-voltage environmental protection cabinet according to claim 1, characterized in that: The air supply structure (71) includes a hopper cover (711) fastened to the switch air chamber (3) at the rear side, an air filling tube (712) fixedly connected to the top right side of the hopper cover (711), a first one-way valve (713) arranged at the bottom side of the air filling tube (712), a mixed gas (714) filled in the hopper cover (711), an air pressure sensor (715) installed on the upper left side of the hopper cover (711), a protective cover (716) embedded in the lower left side of the hopper cover (711), and a micro air pump (717) fastened to the bottom side of the protective cover (716), wherein the right air inlet of the micro air pump (717) is connected to the inside of the hopper cover (711), and the left air outlet of the micro air pump (717) is located at the bottom of the left wall of the hopper cover (711), and the air outlet is connected to the switching structure (73).

3. The 350mm wide high-voltage environmental protection cabinet according to claim 2, characterized in that: The mixed gas (714) is a mixture of SF6 and N2 in a ratio of 4:

6.

4. The 350mm wide high-voltage environmental protection cabinet according to claim 1, characterized in that: The exhaust structure (72) includes a rectangular seat (721) whose top side is fastened to the air supply structure (71), a metal sintered filter element (722), a composite membrane (723), a molecular sieve recovery membrane (724) and an activated carbon adsorption membrane (725) arranged in sequence from left to right inside the rectangular seat (721), a connecting pipe (726) embedded in the left side wall of the rectangular seat (721), a UV lamp (727) embedded in the bottom side of the rectangular seat (721), an exhaust pipe (728) fixed to the right side of the bottom of the rectangular seat (721), and a second one-way valve (729) connected to the top side of the exhaust pipe (728). The left side of the connecting pipe (726) is inserted into the switching structure (73). The bottom of the exhaust pipe (728) passes through the top of the cable compartment (4) and then passes through the rear side wall of the cable compartment (4). The UV lamp (727) is located below the composite membrane (723).

5. The 350mm wide high-voltage environmental protection cabinet according to claim 4, characterized in that: The composite membrane (723) is a PTFE / ceramic composite membrane, and the molecular sieve recovery membrane (724) is a graphene-based sieve membrane.

6. The 350mm wide high-voltage environmental protection cabinet according to claim 4, characterized in that: The surface of the composite film (723) is coated with a nano-TiO2 thin film using a sol-gel method.

7. The 350mm wide high-voltage environmental protection cabinet according to claim 1, characterized in that: The switching structure (73) includes a bin seat (731) connected to the air supply structure (71) and the exhaust structure (72) at the upper and lower parts on the right side, the interior of the bin seat (731) is hollow, and a cushion block (732) is fixedly connected to the right side of the bin seat (731), and a first air channel (733) and a second air channel (734) are formed on the upper and lower sides of the cushion block (732), respectively. A positioning assembly (735) is fastened to the rear side of the bin seat (731), and the positioning assembly (735) is fixed to the rear side of the bin seat (731). The front side of the component (735) is rotated through the rear side wall of the storage seat (731), and the front end of the adjustment component (735) is connected to the switching partition (736). The left side of the hollow inside the storage seat (731) is embedded with a solenoid valve (737). The right side of the first air channel (733) is connected to the air supply structure (71), and the right side of the second air channel (734) is connected to the exhaust structure (72). The switching partition (736) is set on the left side of the cushion block (732).

8. The 350mm wide high-voltage environmental protection cabinet according to claim 7, characterized in that: The left side of the pad (732) is in an arc shape, and a sealing sheet in contact with the switching partition (736) is provided at the arc shape. The switching partition (736) is in a teardrop shape. When the switching partition (736) rotates to the bottommost side, the left side of the bottom of the switching partition (736) contacts the lower inner side of the warehouse seat (731). When the switching partition (736) rotates to the topmost side, the left side of the top of the switching partition (736) contacts the upper inner side of the warehouse seat (731).

9. The 350mm wide high-voltage environmental protection cabinet according to claim 7, characterized in that: The positioning assembly (735) includes a sleeve (7351) fastened to the storage seat (731) at the front side, a servo motor (7352) locked and fixed to the right side of the top of the sleeve (7351), a cover (7353) wrapped around the outside of the servo motor (7352), a screw (7354) connected to the output end at the bottom of the servo motor (7352), an internal threaded gear sleeve (7355) threadedly connected to the outer surface of the screw (7354), and a gear engaged with the inner thread. The fan gear (7356) on the left side of the threaded sleeve (7355) is connected to the bottom of the screw (7354) for rotation and the bottom side of the sleeve (7351), and the top of the screw (7354) is connected to the top of the sleeve (7351) for rotation. The middle part of the rear side of the fan gear (7356) is connected to the sleeve (7351) for rotation. A rotating rod is provided at the front shaft of the fan gear (7356), and the front end of the rotating rod is connected to the switching partition (736).

10. The 350mm wide high-voltage environmental protection cabinet according to claim 9, characterized in that: A sliding groove is provided on the right inner wall of the sleeve (7351), and the right side of the internal threaded tooth sleeve (7355) is inserted and slid inside the sliding groove.

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