A gas-insulated switchgear

Abstract

The application discloses a kind of gas insulated switchgear, belong to gas insulated switchgear field, including front cabinet, protective gas tank, pressure relief chamber and ventilation baffle, switch assembly and ventilation connecting plate are equipped in protective gas tank, first gas tank and second gas tank are equipped in pressure relief chamber, gas hole is equipped in ventilation connecting plate and bottom ventilation baffle of protective gas tank top, and first gas tank and second gas tank with telescopic air bag are set in pressure relief chamber, the telescopic air bag of first gas tank and second gas tank is communicated with ventilation connecting plate and ventilation baffle respectively by connecting pipe, in combination with the design of piston plate in first gas tank and second gas tank and the gas pump of first gas tank and second gas tank, when pumping, two telescopic air bags will be driven by piston plate to expand and pump, one is compressed and exhaust, even if ventilation connecting plate and ventilation baffle realize piston type ventilation process, same pump machine drive can increase synchronism, realize more stable ventilation process, reduce mixed situation.

Description

Technical Field

[0001] This invention belongs to the field of gas-insulated switchgear, and specifically relates to a gas-insulated switchgear. Background Technology

[0002] Gas-insulated switchgear is a fully enclosed gas-insulated electrical device, including circuit breakers, disconnectors, grounding switches, instrument transformers, surge arresters, busbars, connectors, and outgoing terminals. All these components are enclosed in a metal-grounded cabinet filled with a pressurized insulating gas. With the rapid development of science and technology, to enhance environmental protection and reduce the hazards of protective gases, existing switchgear often incorporates environmentally friendly gases such as nitrogen for protection. These switchgear are called gas-insulated environmentally friendly switchgear. To reduce the harm and loss of protective gases when the cabinet is opened, existing technologies include designs for environmentally friendly switchgear with extractable protective gases. However, existing technologies are simple in structure and lack sufficient protective strength. Extraction of the protective gas is simply done using a vacuum pump. Firstly, the negative pressure during extraction can easily damage the components inside the cabinet. Secondly, during the reinjection of the protective gas, if it is a gas with a density similar to air, such as nitrogen, simple reinjection can easily cause it to mix with air, significantly reducing the content of the protective gas and affecting the protective effect in subsequent use. Summary of the Invention

[0003] (a) Technical problems to be solved To overcome the shortcomings of existing technologies, a gas-insulated switchgear is proposed. This addresses the issues of existing technologies, which have simple structures but insufficient protection. The extraction of protective gas is simply done through a vacuum pump, which firstly leads to damage to internal components due to negative pressure during extraction. Secondly, during the reinjection of protective gas, if the gas is nitrogen or similar to air in density, simple reinjection can easily cause it to mix with air, resulting in a significant reduction in the protective gas content and affecting the protective effect in subsequent use.

[0004] (II) Technical Solution This invention is achieved through the following technical solution: This invention proposes a gas-insulated switchgear, the structure of which includes a front cabinet, a protective gas box and a pressure relief chamber, wherein the protective gas box is connected to the front cabinet and the pressure relief chamber respectively; It also includes ventilation partitions; The protective air box is equipped with a switch assembly and a venting plate. The venting plate is used to separate the protective air box and the pressure relief chamber. Both the venting plate and the venting plate are provided with air holes on the side adjacent to the inside of the protective air box. The pressure relief chamber is equipped with a first air storage tank and a second air storage tank. Both the first and second air storage tanks are fitted with piston plates and telescopic air bladders. A piston plate is fixed to the top of the telescopic air bladder, and a three-way valve is connected to the bottom of the telescopic air bladder via a first connecting pipe. The three-way valve connecting the first and second air storage tanks is connected to the inlet and outlet of the air pump, respectively. The three-way valve is also connected to the bottom of the first and second air storage tanks. Both the first and second air storage tanks are equipped with second connecting pipes. The first air storage tank is connected to a ventilated connecting plate via the second and third connecting pipes, and the second air storage tank is connected to a ventilated partition via the second and fourth connecting pipes. Valves are installed between the second, third, and fourth connecting pipes. The telescopic air bladder of the first air storage tank is used for storing protective gas, and the telescopic air bladder of the second air storage tank is used for storing air. The second connecting pipe is used to connect to the bottom of the telescopic air bladder.

[0005] Furthermore, the protective gas box is provided with a first door panel and a sealing ring. The first door panel is used to open and close the protective gas box, and the sealing ring is used to seal the first door panel and the protective gas box. A first gas monitor is installed on the first door panel, and the first gas monitor is used to detect the concentration of the protective gas in the protective gas box.

[0006] Furthermore, the protective gas box is also equipped with an assembly rack with a hollowed-out groove. The assembly rack is used for the suspended assembly of the switch assembly inside the protective gas box, and the hollowed-out groove is used to increase the contact surface between the switch assembly and the protective gas.

[0007] Furthermore, it also includes an interlocking device, which is used to lock the first door panel after the first gas tank releases protective gas and the second gas tank extracts air, and the interlocking device is used to unlock the first door panel after the first gas tank is filled with protective gas and the second gas tank releases air.

[0008] Furthermore, the interlocking device includes a through groove, a pin, a first push rod, a sliding groove, a lever, a second push rod, a hinge groove, a hinge seat, a torsion spring, a third push rod, a first elastic element, a top-pressing assembly plate, a fourth push rod, and a linkage plate. The through groove is disposed at the junction of the vent partition and the bottom of the first door panel. The hinge seat is fixed to the first air storage box. One end of the first and second push rods is respectively hinged to both ends of the lever through the hinge groove. A sliding groove is provided at the hinge point between the lever and the first and second push rods. The middle part of the lever is hinged to the hinge seat. A torsion spring is assembled at the shaft where the lever is hinged to the hinge seat. The torsion spring is used to make the second push rod side of the lever higher than the first push rod side. The push rod, on the side away from the lever, communicates with the interior of the first air storage box. A pin is sleeved on the side of the second push rod away from the lever, and the pin is slidably assembled in a through groove. The top pressure assembly plate is fixed to the second air storage box. A third push rod is fixed to the bottom of one end of the linkage plate. The third push rod is located in the second air storage box on the side away from the linkage plate. A first elastic element is assembled between the top of the linkage plate and the top pressure assembly plate. The first elastic element is used to make the linkage plate fit against the second air storage box. A fourth push rod is fixed to the upper side of the linkage plate away from the third push rod. A pin is also sleeved on the fourth push rod. The pin of the fourth push rod is slidably assembled in another through groove. The bottom of the first door panel is provided with a pin groove that engages with the pin.

[0009] Furthermore, the interlocking device also includes a second elastic element. The second and fourth push rods are both fitted with the second elastic element between them and the pin. The top of the pin is inclined near the first door panel. The maximum contraction distance of the pin pressing the second elastic element is greater than the distance of the pin extending above the through groove.

[0010] Furthermore, the pressure relief chamber is equipped with a second door panel for opening and closing the chamber. A control panel is mounted on the second door panel for controlling the air pump. The first air storage tank is equipped with a third door panel for opening and closing. The second air storage tank is equipped with a fourth door panel for opening and closing. Both the third and fourth door panels are fitted with glass plates. The telescopic airbags of both the first and second air storage tanks are equipped with second gas monitors for detecting the concentration of protective gas inside the telescopic airbags. The glass plates are used for observing the second gas monitors.

[0011] Furthermore, a sealing sleeve is fitted at the point where the second connecting pipe passes through the first and second gas storage tanks, and sealing sleeves are also fitted at the points where the first push rod passes through the first gas storage tank and the third push rod passes through the second gas storage tank.

[0012] Furthermore, the front cabinet includes an instrument box, a mechanism box, and a cable compartment, which are arranged sequentially from top to bottom, and are all connected to a protective air box.

[0013] Furthermore, the switch assembly includes an outgoing bushing, a grounding switch, a disconnecting switch, a side expansion bushing, and a circuit breaker. The outgoing bushing is used to connect the protective gas box to the cable compartment, and the side expansion bushing is used to connect the protective gas box to the other compartments.

[0014] Furthermore, the protective gas is nitrogen.

[0015] Furthermore, both the first elastic element and the second elastic element are compression springs or elastic materials such as rubber.

[0016] Furthermore, both the sealing ring and the telescopic airbag are made of rubber, and the telescopic airbag is in the shape of a corrugated tube.

[0017] Furthermore, it also includes side panels, which are used for the overall connection and protection of the side end faces of the front cabinet, protective air box and pressure relief chamber.

[0018] (III) Beneficial Effects One of the above technical solutions has the following advantages or beneficial effects: By providing air vents at the venting connecting plate at the top and the venting partition at the bottom of the protective air box, and by installing a first air storage box and a second air storage box with telescopic airbags in the pressure relief chamber, the telescopic airbags of the first and second air storage boxes are connected to the venting connecting plate and the venting partition respectively through connecting pipes. Combined with the design of the piston plates inside the first and second air storage boxes and the connection of the air pumps of the first and second air storage boxes, when the equipment's air pump is drawing air, the piston plates of the first and second air storage boxes will rise and fall respectively, thereby driving the two telescopic airbags to extend to draw air and compress to exhaust air. Even if the venting connecting plate and the venting partition connected to the two compressed airbags draw air and exhaust air respectively, a piston-type air exchange process of the protective air box is realized. The pump-driven method can increase synchronization, achieve a more stable air exchange process, and reduce mixing. Combined with the characteristic of nitrogen and other sealed gases being slightly lower than air, i.e., air will sink, the design of the protective gas drawing and exhausting gas at the top and the air drawing and exhausting gas at the bottom can make the air exchange smoother and more efficient, further reducing mixing. The design of the three-way valve connecting the pump, the two gas storage tanks, and the two telescopic air bladders gives the equipment more options for gas extraction and exhaust. When the pressure inside the protective gas tank is high, the empty air bladder can be opened, or the protective gas tank and the gas storage tank can be connected for emergency depressurization. The dual air bladder design allows for the control and recovery of the protective gas content during gas exchange. During recovery, the gas can be extracted and replaced by connecting to an external gas tank through the three-way valve, which is convenient and quick. In addition, the equipment adopts dual gas storage protection of air bladders and gas storage tanks, which can further reduce the possibility of gas leakage. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a frontal perspective view of the present invention; Figure 2 This is a three-dimensional structural diagram of the back of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the back panel after removing the back panel of the present invention; Figure 4 For the present invention Figure 3 A magnified structural diagram of A in the middle; Figure 5 This is a three-dimensional structural diagram of the protective gas storage structure on the back of the gas storage tank after the door panel of the gas storage tank is removed according to the present invention. Figure 6 For the present invention Figure 5 A magnified structural diagram of B in the diagram; Figure 7 This is a three-dimensional structural diagram of the back of the protective gas venting structure after removing the gas storage tank door panel according to the present invention. Figure 8 This is a schematic diagram of the rear three-dimensional structure of the present invention after removing one side panel and opening the rear door panel; Figure 9 This is a three-dimensional structural diagram of the first gas storage tank of the present invention; Figure 10 This is a three-dimensional structural diagram of the first gas storage tank after a side section of the present invention; Figure 11 For the present invention Figure 10 A magnified structural diagram of C; Figure 12 This is a three-dimensional structural schematic diagram of the second gas storage tank of the present invention; Figure 13 This is a three-dimensional structural diagram of the first gas storage box pin sleeve on the fourth top rod of the present invention (half-section). In the diagram: Side panel-1, Front cabinet-2, Protective air box-3, Ventilation partition-4, Pressure relief chamber-5, Interlock device-6, Door lock-7, Instrument box-201, Mechanism box-202, Cable compartment-203, First gas monitor-301, Switch assembly-302, Ventilation connecting plate-303, Assembly rack-304, Sealing ring-305, Air vent-306, First door panel-307, Control panel-501, Fourth door panel-502, Glass plate-503, Air pump-504, Third door panel-505, First air tank-506, Piston plate-507, Telescopic airbag-508, Second gas monitor-509, Second air tank-510, First connecting pipe-511, Three-way valve-512. Third connecting pipe - 513, valve - 514, second connecting pipe - 515, sealing sleeve - 516, fourth connecting pipe - 517, second door panel - 518, through groove - 601, pin - 602, first top rod - 603, sliding groove - 604, lever - 605, second top rod - 606, hinge groove - 607, hinge seat - 608, torsion spring - 609, third top rod - 610, first elastic element - 611, top pressure assembly plate - 612, fourth top rod - 613, linkage plate - 614, second elastic element - 615, outgoing sleeve - 30201, grounding switch - 30202, disconnecting switch - 30203, side expansion sleeve - 30204, circuit breaker - 30205, hollow groove - 30401. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0021] Example 1: like Figure 1-12 As shown, the present invention provides a gas-insulated switchgear: its structure includes a front cabinet 2, a protective gas box 3 and a pressure relief chamber 5, wherein the protective gas box 3 is connected to the front cabinet 2 and the pressure relief chamber 5 respectively; It also includes ventilation partition 4; The protective air box 3 is provided with a switch assembly 302 and a venting connecting plate 303. The venting baffle 4 is used to separate the protective air box 3 and the pressure relief chamber 5. The venting baffle 4 and the venting connecting plate 303 are both provided with air holes 306 on the side adjacent to the inside of the protective air box 3. The pressure relief chamber 5 is equipped with a first air storage tank 506 and a second air storage tank 510. Both the first air storage tank 506 and the second air storage tank 510 are fitted with a piston plate 507 and a telescopic airbag 508. The top of the telescopic airbag 508 is fixed with the piston plate 507, and the bottom of the telescopic airbag 508 is connected to a three-way valve 512 via a first connecting pipe 511. The three-way valve 512 connecting the first air storage tank 506 and the second air storage tank 510 is connected to the inlet and outlet ports of the air pump 504, respectively. The three-way valve 512 is also connected to the bottom of the first air storage tank 506 and the second air storage tank 510. Both gas storage tanks 510 are equipped with second connecting pipes 515. The first gas storage tank 506 is connected to the ventilated connecting plate 303 through the second connecting pipe 515 and the third connecting pipe 513. The second gas storage tank 510 is connected to the ventilated partition 4 through the second connecting pipe 515 and the fourth connecting pipe 517. A valve 514 is installed between the second connecting pipe 515, the third connecting pipe 513, and the fourth connecting pipe 517. The telescopic airbag 508 of the first gas storage tank 506 is used for storing protective gas. The telescopic airbag 508 of the second gas storage tank 510 is used for storing air. The second connecting pipe 515 is used to connect to the bottom of the telescopic airbag 508.

[0022] Furthermore, the protective gas box 3 is provided with a first door plate 307 and a sealing ring 305. The first door plate 307 is used to open and close the protective gas box 3, and the sealing ring 305 is used to seal the first door plate 307 and the protective gas box 3. A first gas monitor 301 is installed on the first door plate 307, and the first gas monitor 301 is used to detect the concentration of protective gas in the protective gas box 3.

[0023] Furthermore, the pressure relief chamber 5 is provided with a second door panel 518, which is used to open and close the pressure relief chamber 5. The second door panel 518 is equipped with a control panel 501, which is used to control the air pump 504. The first air storage tank 506 is provided with a third door panel 505, which is used to open and close the first air storage tank 506. The second air storage tank 510 is provided with a fourth door panel 502, which is used to open and close the second air storage tank 510. Both the third door panel 505 and the fourth door panel 502 are equipped with glass plates 503. The telescopic airbags 508 of the first air storage tank 506 and the second air storage tank 510 are both equipped with second gas monitors 509, which are used to detect the concentration of protective gas inside the telescopic airbags 508. The glass plates 503 are used for observation of the second gas monitors 509.

[0024] Furthermore, a sealing sleeve 516 is fitted at the point where the second connecting pipe 515 passes through the first gas storage box 506 and the second gas storage box 510.

[0025] Furthermore, the front cabinet 2 includes an instrument box 201, a mechanism box 202, and a cable compartment 203, which are arranged sequentially from top to bottom. The instrument box 201, mechanism box 202, and cable compartment 203 are all connected to the protective air box 3.

[0026] Furthermore, the switch assembly 302 includes an outgoing bushing 30201, a grounding switch 30202, a disconnecting switch 30203, a side expansion bushing 30204, and a circuit breaker 30205. The outgoing bushing 30201 is used to connect the protective gas box 3 with the cable chamber 203, and the side expansion bushing 30204 is used to connect the protective gas box 3 with the other chambers.

[0027] Furthermore, both the sealing ring 305 and the telescopic airbag 508 are made of rubber, and the telescopic airbag 508 is in the shape of a corrugated tube.

[0028] Furthermore, it also includes a side guard plate 1, which is used for the overall connection and protection of the side end faces of the front cabinet 2, the protective air box 3 and the pressure relief chamber 5.

[0029] Furthermore, both the three-way valve 512 and the valve 514 are electrically controlled valves.

[0030] During use, when the protective air chamber 3 needs to be opened, the air pump 504 is controlled via the control panel 501 to store protective gas in the protective air chamber 3. During evacuation, the second connecting pipe 515, the third connecting pipe 513, and the fourth connecting pipe 517 are opened via valve 514. Then, the first air chamber 506 and the second air chamber 510 are connected via the three-way valve 512. After the air pump 504 evacuates, the air inside the second air chamber 510 but outside the telescopic air bladder 508 is drawn to the outside of the telescopic air bladder 508 of the first air chamber 506. This causes the piston plate 507 inside the second air chamber 510 to descend, while the piston plate 507 of the first air chamber 506 rises steadily and synchronously. This causes the two telescopic air bladders 508 connected to the piston plate 507 to compress and extend, allowing the air inside the telescopic air bladders 508 of the second air chamber 510 to pass through... The protective gas enters the bottom of the protective gas box 3 through the air hole 306 of the ventilation baffle 4 via the second connecting pipe 515 and the fourth connecting pipe 517. The protective gas originally in the protective gas box 3 will be drawn into the telescopic air bag 508 from the ventilation baffle 303 via the third connecting pipe 513 and the second connecting pipe 515 due to the extension of the telescopic air bag 508 of the first storage air box 506. Due to the synchronous control of the single air pump 504, the extraction and exhaust are stable, realizing the piston-type air exchange process of the protective gas box 3, reducing the mixing situation. Combined with the characteristics of nitrogen and other sealed gas that are slightly lower than air, i.e., air will sink, the design of the protective gas extraction and exhaust is at the top and the air extraction and exhaust is at the bottom, which can make the air exchange smoother and more efficient, further reducing the mixing. When it is necessary to fill the gas for protection, the pump can be controlled to extract in reverse. The equipment adopts dual gas storage protection of air bag and storage air box, which can further reduce the leakage of stored gas. Meanwhile, when there is high pressure inside the protective air box 3, the three-way valve 512 can be opened to open the telescopic air bag 508 of the first air storage box 506 separately to release pressure, or the two air bags can be connected through the three-way valve 512 to release pressure, or the air bag or the inside of the protective box can be connected to release pressure, so as to facilitate emergency pressure release. When the gases in the first gas storage tank 506 and the second gas storage tank 510 do not meet the protection requirements, the first gas storage tank 506 and the second gas storage tank 510 can be opened, and the three-way valve 512 can be used to connect the connectors inside the first gas storage tank 506 and the second gas storage tank 510 to the external storage tank for gas exchange. This facilitates the recovery and treatment of protective gases that do not meet the required concentration, reducing waste and environmental pollution caused by random emissions.

[0031] Example 2: like Figure 3 , 5As shown in Figures 7 and 8, compared to Embodiment 1, the protective gas box 3 in this embodiment is further provided with an assembly frame 304. The assembly frame 304 is provided with a hollow groove 30401. The assembly frame 304 is used for the suspended assembly of the switch assembly 302 in the protective gas box 3. The hollow groove 30401 is used to increase the contact surface between the switch assembly 302 and the protective gas, so that the switch assembly 302 is not directly assembled on the box body, increasing the contact and coverage surface of the protective gas, and further improving the protective performance. The rest of the structure and effect remain unchanged.

[0032] Example 3: like Figure 4 As shown, compared to the previous embodiment, this embodiment also includes an interlocking device 6. The interlocking device 6 is used to lock the first door panel 307 after the first gas storage tank 506 releases protective gas and the second gas storage tank 510 extracts air. The interlocking device 6 is also used to unlock the first door panel 307 after the first gas storage tank 506 is filled with protective gas and the second gas storage tank 510 releases air. Through the linkage locking of the interlocking device 6, the door panel of the protective gas tank 3 can be further prevented from being opened at will, causing leakage and high concentration of gas causing harm to personnel, thus improving the safety of equipment use. The rest of the structure and effect remain unchanged.

[0033] Example 4: like Figure 4 , 5As shown in Figures 7, 8, 11, and 12, compared to the previous embodiments, the interlocking device 6 in this embodiment includes a through groove 601, a pin 602, a first push rod 603, a sliding groove 604, a lever 605, a second push rod 606, a hinge groove 607, a hinge seat 608, a torsion spring 609, a third push rod 610, a first elastic element 611, a top-pressing assembly plate 612, a fourth push rod 613, and a linkage plate 614. The through groove 601 is disposed at the junction of the ventilation partition 4 and the bottom of the first door panel 307. The hinge seat 608 is fixed to the first air storage box 506. One end of the first push rod 603 and the second push rod 606 are respectively hinged to both ends of the lever 605 through the hinge groove 607. The hinge joint between the lever 605 and the first push rod 603 and the second push rod 606 is provided with a sliding groove 604. The middle part of the lever 605 is hinged to the hinge seat 608. A torsion spring 609 is installed at the shaft where the lever 605 is hinged to the hinge seat 608. The torsion spring 609 is used to make the second push rod 606 side of the lever 605 higher than the first push rod 606 side. On the side of the first push rod 603, the side of the first push rod 603 away from the lever 605 communicates with the interior of the first air storage box 506. A pin 602 is sleeved on the side of the second push rod 606 away from the lever 605. The pin 602 is slidably fitted into the through groove 601. The top pressure mounting plate 612 is fixed to the second air storage box 510. A third push rod 610 is fixed to the bottom of one end of the linkage plate 614. The side of the third push rod 610 away from the linkage plate 614 is located inside the second air storage box 510. The linkage plate 61... A first elastic element 611 is assembled between the top and the top pressure assembly plate 612. The first elastic element 611 is used to make the linkage plate 614 fit against the second air storage box 510. A fourth top rod 613 is fixed on the upper side of the linkage plate 614 away from the third top rod 610. A pin 602 is also sleeved on the fourth top rod 613. The pin 602 of the fourth top rod 613 is slidably assembled in another through groove 601. The bottom of the first door panel 307 is provided with a pin groove (not shown in the figure) that engages with the pin 602.

[0034] like Figure 13 As shown, in one embodiment, the interlocking device 6 further includes a second elastic element 615. The second push rod 606 and the fourth push rod 613 are both fitted with the second elastic element 615 between them and the pin 602. The top of the pin 602 is inclined near the first door panel 307. The maximum contraction distance of the pin 602 pressing the second elastic element 615 is greater than the distance of the pin 602 above the through groove 601, which facilitates the direct closing of the first door panel 307.

[0035] Furthermore, the protective gas is nitrogen.

[0036] Furthermore, both the first elastic element 611 and the second elastic element 615 are compression springs or elastic materials such as rubber.

[0037] Furthermore, sealing sleeves 516 are also fitted at the points where the first push rod 603 penetrates the first gas storage box 506 and the third push rod 610 penetrates the second gas storage box 510.

[0038] In use, after the protective air box 3 is filled with gas, the telescopic airbag 508 of the first air storage box 506 is in a compressed state, meaning the piston plate 507 is also in a low position inside the first air storage box 506. This causes the first push rod 603 to be in a non-pressurized state. At this time, the lever 605 will cause the first push rod 603 to descend due to the action of the torsion spring 609, and cause the second push rod 606 to rise. This causes the pin 602 at the top of the second push rod 606 to enter the pin groove at the bottom of the first door panel 307 to lock the first door panel 307. Meanwhile, the second air storage box 510 is in a stretched state because the telescopic airbag 508 is in an extended state, meaning the piston plate 507 is also in a high position inside the second air storage box 510. This causes the piston plate 507 of the second air storage box 510 to press against the third push rod 610, causing the linkage plate 614 to compress the first elastic element. After 611 rises, the fourth push rod 613 at the other end of the linkage plate 614 also rises, so that the pin 602 at the top of the fourth push rod 613 will also enter the pin groove at the bottom of the first door plate 307 to lock the first door plate 307, realizing the mechanical linkage door plate locking, which is more reliable and avoids the situation where the first door plate 307 is insufficiently protected due to electronic failure. When it is necessary to open the first door plate 307, the piston plate 507 of the first gas storage box 506 needs to rise to a high position, or even be set to the top or near the top, so that the piston plate 507 presses the first push rod 603 to rise. The second push rod 606 is driven down by the lever 605 before it can be unlocked. This ensures that the door plate cannot be opened if the protective gas inside the protective gas box 3 is not completely evacuated, avoiding the situation where high concentration of protective gas will injure people and leak when the door is opened at will. The first door panel 307 can be additionally fitted with a door lock 7, which is used to lock the door to protect its opening and closing. The pin 602 is used to ensure the safety of opening and closing the door. The rest of the structure and effect are the same as those in the previous embodiment.

[0039] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0040] The control method of this invention is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this invention is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gas-insulated switchgear, the structure of which includes a front cabinet (2), a protective gas box (3) and a pressure relief chamber (5), wherein the protective gas box (3) is connected to the front cabinet (2) and the pressure relief chamber (5) respectively; Its features are: It also includes a ventilation partition (4); The protective air box (3) is provided with a switch assembly (302) and a venting connecting plate (303). The venting partition (4) is used to separate the protective air box (3) and the pressure relief chamber (5). The venting partition (4) and the venting connecting plate (303) are provided with air holes (306) on the side adjacent to the inside of the protective air box (3). The pressure relief chamber (5) is equipped with a first air storage tank (506) and a second air storage tank (510). Both the first air storage tank (506) and the second air storage tank (510) are equipped with a piston plate (507) and a telescopic airbag (508). The top of the telescopic airbag (508) is fixed with the piston plate (507), and the bottom of the telescopic airbag (508) is connected to a three-way valve (512) via a first connecting pipe (511). The three-way valve (512) connecting the first air storage tank (506) and the second air storage tank (510) is connected to the inlet and outlet ports of the air pump (504), respectively. The three-way valve (512) is also connected to the bottom of the first air storage tank (506) and the second air storage tank (510). The first air storage tank (506) and the second air storage tank (510) are connected to the first air storage tank (506) and the second air storage tank (510). Both gas storage tanks (510) are equipped with a second connecting pipe (515). The first gas storage tank (506) is connected to the ventilation connecting plate (303) through the second connecting pipe (515) and the third connecting pipe (513). The second gas storage tank (510) is connected to the ventilation partition (4) through the second connecting pipe (515) and the fourth connecting pipe (517). A valve (514) is installed between the second connecting pipe (515), the third connecting pipe (513), and the fourth connecting pipe (517). The telescopic airbag (508) of the first gas storage tank (506) is used for storing protective gas. The telescopic airbag (508) of the second gas storage tank (510) is used for storing air. The second connecting pipe (515) is used to connect to the bottom of the telescopic airbag (508).

2. The gas-insulated switchgear according to claim 1, characterized in that: The protective gas box (3) is provided with a first door plate (307) and a sealing ring (305). The first door plate (307) is used to open and close the protective gas box (3), and the sealing ring (305) is used to seal the first door plate (307) and the protective gas box (3). The first door plate (307) is equipped with a first gas monitor (301), which is used to detect the concentration of protective gas in the protective gas box (3).

3. A gas-insulated switchgear according to claim 1 or 2, characterized in that: The protective gas box (3) is also provided with an assembly frame (304), and the assembly frame (304) is provided with a hollow groove (30401). The assembly frame (304) is used for the suspended assembly of the switch assembly (302) in the protective gas box (3), and the hollow groove (30401) is used to increase the contact surface between the switch assembly (302) and the protective gas.

4. A gas-insulated switchgear according to claim 2, characterized in that: It also includes an interlocking device (6), which is used to lock the first door panel (307) after the first gas storage box (506) releases protective gas and the second gas storage box (510) extracts air, and the interlocking device (6) is used to unlock the first door panel (307) after the first gas storage box (506) is filled with protective gas and the second gas storage box (510) releases air.

5. A gas-insulated switchgear according to claim 2 or 4, characterized in that: It also includes an interlocking device (6), which includes a through groove (601), a pin (602), a first push rod (603), a slide groove (604), a lever (605), a second push rod (606), a hinge groove (607), a hinge seat (608), a torsion spring (609), a third push rod (610), a first elastic element (611), a top pressure assembly plate (612), a fourth push rod (613), and a linkage plate (614). The through groove (601) is provided at the junction of the ventilation partition (4) and the bottom of the first door panel (307). The hinge seat (608) The lever (605) is fixed to the first gas storage box (506). One end of the first push rod (603) and the second push rod (606) are respectively hinged to the two ends of the lever (605) through the hinge groove (607). The lever (605) is provided with a sliding groove (604) at the hinge point between the first push rod (603) and the second push rod (606). The middle part of the lever (605) is hinged to the hinge seat (608). A torsion spring (609) is installed at the shaft where the lever (605) is hinged to the hinge seat (608). The torsion spring (609) is used to make the second push rod (606) of the lever (605) laterally higher. On the side of the first push rod (603), the side of the first push rod (603) away from the lever (605) communicates with the interior of the first air storage box (506). A pin (602) is sleeved on the side of the second push rod (606) away from the lever (605). The pin (602) is slidably fitted into the through groove (601). The top pressure mounting plate (612) is fixed to the second air storage box (510). A third push rod (610) is fixed to the bottom of one end of the linkage plate (614). The side of the third push rod (610) away from the linkage plate (614) is located inside the second air storage box (510). A first elastic element (611) is assembled between the top of the moving plate (614) and the top pressure assembly plate (612). The first elastic element (611) is used to make the linkage plate (614) fit against the second air storage box (510). A fourth top rod (613) is fixed on the upper side of the linkage plate (614) away from the third top rod (610). A pin rod (602) is also sleeved on the fourth top rod (613). The pin rod (602) of the fourth top rod (613) is slidably assembled in another through groove (601). The bottom of the first door plate (307) is provided with a pin groove that engages with the pin rod (602).

6. A gas-insulated switchgear according to claim 5, characterized in that: The interlocking device (6) also includes a second elastic element (615). The second push rod (606) and the fourth push rod (613) are both equipped with the second elastic element (615) between them and the pin (602). The top of the pin (602) is inclined near the first door panel (307). The maximum contraction distance of the pin (602) pressing the second elastic element (615) is greater than the distance of the pin (602) above the through groove (601).

7. A gas-insulated switchgear according to claim 1, characterized in that: The pressure relief chamber (5) is provided with a second door panel (518), which is used to open and close the pressure relief chamber (5). The second door panel (518) is equipped with a control panel (501), which is used to control the air pump (504). The first air storage tank (506) is provided with a third door panel (505), which is used to open and close the first air storage tank (506). The second air storage tank (510) is provided with a fourth door panel (502). The four door panels (502) are used to open and close the second gas storage box (510). The third door panel (505) and the fourth door panel (502) are both equipped with glass plates (503). The telescopic airbags (508) of the first gas storage box (506) and the second gas storage box (510) are both equipped with second gas monitors (509). The second gas monitors (509) are used to detect the concentration of protective gas in the telescopic airbags (508). The glass plates (503) are used for observation of the second gas monitors (509).

8. A gas-insulated switchgear according to claim 5, characterized in that: The second connecting pipe (515) is fitted with a sealing sleeve (516) at the point where it passes through the first gas storage box (506) and the second gas storage box (510). The first push rod (603) is also fitted with a sealing sleeve (516) at the point where it passes through the first gas storage box (506) and the third push rod (610) is fitted with a sealing sleeve (516) at the point where it passes through the second gas storage box (510).

9. A gas-insulated switchgear according to claim 1, characterized in that: The front cabinet (2) includes an instrument box (201), a mechanism box (202) and a cable compartment (203). The instrument box (201), mechanism box (202) and cable compartment (203) are arranged from top to bottom. The instrument box (201), mechanism box (202) and cable compartment (203) are all connected to the protective air box (3).

10. A gas-insulated switchgear according to claim 9, characterized in that: The switch assembly (302) includes an outgoing bushing (30201), a grounding switch (30202), a disconnecting switch (30203), a side expansion bushing (30204), and a circuit breaker (30205). The outgoing bushing (30201) is used to connect the protective gas box (3) with the cable compartment (203), and the side expansion bushing (30204) is used to connect the protective gas box (3) with the other compartments.

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