Power electrical switch cabinet with protection function

Abstract

The invention relates to the technical field of electrical equipment, in particular to a power electrical switch cabinet with a protection function, which comprises an electrical box, a mounting plate is detachably mounted at the inner end of the electrical box through bolts, a main switch is fixedly mounted on the outer surface of the mounting plate, and a plurality of air switches are further fixedly mounted on the outer surface of the mounting plate. A plurality of isolation cylinders are fixedly mounted on the outer surface of the mounting plate through hoops, the isolation cylinders are located below the main switch, an air storage tank is fixedly mounted between the mounting plate and the electric box, flame-retardant pop-up devices are arranged between the isolation cylinders and the air storage tank, and when the main switch is overloaded, the temperature of the contact point of the clamping plate and the plug pin rises to trigger the fixed bag to be broken in time; the expansion agent in the liquid storage bag is further released, the expansion agent rapidly covers and isolates a heating part after being sprayed out, contact between conductive parts is effectively cut off, more serious accidents caused by secondary electric shock or continuous short circuit are avoided, carbon dioxide serves as inert gas, the heating area is rapidly cooled, and fire disasters in the electric box can also be avoided.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, specifically to a power electrical switchgear with protective functions. Background Technology

[0002] Electrical switchgear is an important power distribution and control device in the power system. It is widely used in power plants, substations, and power supply and distribution networks of industrial and civil buildings. Its main function is to control, protect and monitor electrical lines to ensure the safe and stable operation of the power system.

[0003] However, during the long-term operation of the switchgear, the internal conductive components or cables are prone to high temperature rise under overload conditions, and electric arcing may occur between the contacts. Although the circuit breakers or fuses commonly used in the prior art can achieve electrical disconnection of the circuit, their protection method is limited to interrupting the current. They cannot effectively cover and isolate the parts that have already heated up or generated electric arcs, which means that the heated points may still be in a live state, posing a risk of secondary electric shock or continuous short circuit. At the same time, the excessive temperature rise at the cable ends or contact points often causes the insulation layer to burn or even the electrical box to catch fire, which seriously affects the safety and reliability of the switchgear. Therefore, this application proposes a power electrical switchgear with protective functions. Summary of the Invention

[0004] The purpose of this invention is to provide a power switchgear with protective functions to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a power switch cabinet with protective functions, comprising an electrical box, an installation plate detachably mounted on the inner end of the electrical box by bolts, a main switch fixedly mounted on the outer surface of the installation plate, and multiple air switches fixedly mounted on the outer surface of the installation plate, multiple isolation cylinders fixedly mounted on the outer surface of the installation plate by clamps, and the isolation cylinders being located below the main switch, a gas storage tank fixedly mounted between the installation plate and the electrical box, a flame-retardant ejection device being provided between the isolation cylinders and the gas storage tank, a shunt sleeve fixedly connected to the bottom end of the gas storage tank, an output pipe fixedly connected to the outer surface of the shunt sleeve, and multiple rectangular sliding holes opened on the outer surface of the installation plate, the rectangular sliding holes being located on the upper and lower sides of the air switches, and multiple movable blocks slidably mounted in the rectangular sliding holes, the number of movable blocks being determined according to the number of ports of the air switches.

[0006] As a further embodiment of the present invention, the flame-retardant ejection device includes a accumulator cylinder, which is fixedly installed on the outer surface of the mounting plate. A locking rod is inserted through the inner end of the accumulator cylinder. A three-way pipe is fixedly connected to the bottom end of the accumulator cylinder. An extension pipe is fixedly connected to the side input end of the three-way pipe, and the extension pipe is fixedly connected to the output pipe. A locking sleeve is fixedly connected to the end of the three-way pipe away from the accumulator cylinder. Through the cooperative structure of the accumulator cylinder, the three-way pipe, and the locking sleeve, the flame-retardant ejection device realizes the rapid release of the flame-retardant medium after triggering, which can act on the heating or arcing parts in time, and achieve the effect of rapid isolation and fire extinguishing.

[0007] As a further embodiment of the present invention, a guide tube is fixedly connected to the outer surface of the isolation cylinder, an adjusting screw sleeve is rotatably installed at the end of the guide tube, and the locking sleeve is threaded onto the outer surface of the adjusting screw sleeve. A movable plug is provided inside the accumulator cylinder, the movable plug is fixedly connected to the locking rod, and the movable plug is connected to the accumulator cylinder by a return spring. By setting the guide tube and adjusting screw sleeve on the isolation cylinder, and combining the threaded engagement structure of the locking sleeve, flexible adjustment and positioning of the flame-retardant ejection device can be achieved.

[0008] As a further embodiment of the present invention, a guide tube is fixedly installed at the upper end of the adjusting screw sleeve. The guide tube passes through the inside of the tee pipe, and a guide hole is opened on the outer surface of the guide tube. When the guide tube moves upward, its guide hole enters the inside of the accumulator, so that the accumulator is connected to the locking sleeve. By setting the matching structure between the adjusting screw sleeve and the guide tube, the guide hole can enter the inside of the accumulator when the guide tube moves upward, thereby realizing the connection between the accumulator and the locking sleeve. This design is simple in structure, easy to operate, and can flexibly control the connection and disconnection of the accumulator.

[0009] As a further embodiment of the present invention, an isolation block is fixedly installed at the inner end of the adjusting screw sleeve, a support sleeve is fixedly installed inside the guide tube, and a liquid storage bladder is provided between the support sleeve and the isolation block. A sealing cap is provided through the inner end of the support sleeve, and the sealing cap separates the upper and lower spaces of the support sleeve. By setting an isolation block at the inner end of the adjusting screw sleeve and setting a support sleeve inside the guide tube, arranging a liquid storage bladder between the two, and separating the upper and lower spaces of the support sleeve by the sealing cap, it is possible not only to ensure that the liquid storage bladder is stably stored in an independent sealed environment, avoiding premature contact with the outside world and failure, but also to achieve rapid release through the action of the sealing cap when triggered, thereby improving the sealing performance of the structure and the reliability of the operation.

[0010] As a further embodiment of the present invention, a sealing cap is provided inside the isolation block, and multiple arc-shaped guide grooves are provided at the inner end of the isolation block. Locking springs are provided in each arc-shaped guide groove. The locking springs are arranged in a ring. After the locking springs are inserted into the arc-shaped guide grooves, they deform along the guide grooves and move upwards, so that their tops contact the bottom of the sealing cap. A pad is fixedly installed at the end of each locking spring away from the isolation block. The pad contacts the top of the liquid storage bladder. By setting arc-shaped guide grooves and ring-shaped locking springs inside the isolation block, the locking springs deform along the arc-shaped guide grooves and move upwards when subjected to force, and their tops contact the bottom of the sealing cap, thereby achieving reliable positioning and sealing of the sealing cap.

[0011] As a further embodiment of the present invention, a plurality of clamping plates are fixedly installed at the inner end of the isolation cylinder, and the clamping plates are arranged in a ring. A wiring terminal is provided at the bottom of the isolation cylinder, and a pin is fixedly connected to one end of the wiring terminal near the isolation cylinder. When the pin moves upward and passes through the clamping plate, it forces the clamping plate to elastically deform in all directions. A fixing bladder is sleeved at the inner end of the isolation cylinder, and the fixing bladder wraps around the plurality of clamping plates and is connected to the guide tube.

[0012] As a further embodiment of the present invention, a guide block is rotatably mounted on the inner end of the diverter sleeve, and a guide hole is opened on the outer surface of the guide block. After the guide block is rotated, the guide hole is connected to the output pipe. An adjustment block is rotatably mounted on the outer surface of the mounting plate. A worm wheel is fixedly connected to the bottom end of the guide block, and a worm is fixedly connected to the end of the adjustment block near the diverter sleeve, and the worm meshes with the worm wheel.

[0013] As a further embodiment of the present invention, a rubber sleeve is provided at the inner end of the movable block, and a buffer cylinder is fixedly connected to the end of the movable block away from the rubber sleeve. A trigger plug is sleeved inside the buffer cylinder, and a diversion pipe is fixedly connected to the output port of the diversion sleeve. The input end of the buffer cylinder is connected to the diversion pipe. By providing a rubber sleeve at the inner end of the movable block and connecting a buffer cylinder at its far end, and a trigger plug being sleeved inside the buffer cylinder, while the diversion sleeve is connected to the buffer cylinder through the diversion pipe, a stable force can be formed on the trigger plug when gas or liquid enters the buffer cylinder, thereby achieving buffering and delay control of the triggering mechanism.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. When the main switch is overloaded, the temperature at the contact point between the card plate and the pin rises, which can trigger the rupture of the fixing bladder in time, thereby releasing the expansion agent in the reservoir. After the expansion agent is sprayed out, it quickly covers and isolates the heated part, effectively cutting off the contact between conductive parts and avoiding more serious accidents caused by secondary electric shock or continuous short circuit. At the same time, the liquid carbon dioxide in the accumulator rapidly vaporizes and expands after being triggered, and is discharged to the fault point through the guide tube. As an inert gas, carbon dioxide can not only take away a lot of heat during the spraying process and quickly cool the heated area, but also prevent fire in the electrical box. 2. After completing a protection action, this invention only requires replacing components such as the guide tube, fixing bladder, and liquid storage bladder, and reconnecting the accumulator and the gas storage tank by adjusting the screw sleeve. Liquid carbon dioxide can then be refilled and the protection function restored, reducing maintenance costs and increasing the service life of the switchgear. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the electrical box structure; Figure 2 This is a structural diagram of the mounting plate area; Figure 3 This is a structural diagram of the mounting plate and the movable block; Figure 4 This is a schematic diagram of the main switch and the accumulator. Figure 5 This is a schematic diagram of the internal structure of the accumulator cylinder; Figure 6 This is a disassembled diagram of the locking sleeve. Figure 7 This is a schematic diagram of the internal structure of the isolation block; Figure 8 This is a schematic diagram of the internal structure of the isolation cylinder; Figure 9 This is a schematic diagram showing the connection between the gas storage tank and the distribution pipe. Figure 10 This is a schematic diagram of the internal structure of the diversion sleeve; Figure 11 This is a schematic diagram of the internal structure of the buffer cylinder.

[0016] In the diagram: 1. Electrical box; 2. Main switch; 3. Mounting plate; 4. Circuit breaker; 101. Isolation cylinder; 102. Terminal block; 103. Auxiliary spring; 104. Guide tube; 105. Locking sleeve; 106. Extension tube; 107. Accumulator; 108. Locking rod; 109. Pop-out rod; 110. Trigger spring; 111. Fixing sleeve; 112. Movable plug; 113. Conductor tube; 114. T-connector; 115. Adjusting screw sleeve; 116. Fixing bladder; 117. Clamping plate; 118. Pin; 201. Gas storage tank; 202. Output pipe; 203. Diverter sleeve; 204. Adjusting block; 205. Diverter pipe; 206. Guide block; 207. Worm gear; 208. Worm wheel; 301. Isolation block; 302. Liquid reservoir; 303. Support sleeve; 304. Sealing cap; 305. Sealing cap; 306. Locking spring; 401. Movable block; 402. Buffer cylinder; 403. Rubber sleeve; 404. Trigger plug. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: Please refer to Figures 1-4 A power switch cabinet with protective functions includes an electrical box 1. An installation plate 3 is detachably installed on the inner end of the electrical box 1 by bolts. A main switch 2 is fixedly installed on the outer surface of the installation plate 3, and multiple air switches 4 are also fixedly installed on the outer surface of the installation plate 3. The main switch 2 and the multiple air switches 4 are connected by wires (not shown in the figure). Multiple isolation cylinders 101 are fixedly installed on the outer surface of the installation plate 3 by clamps, and the isolation cylinders 101 are located below the main switch 2. The number of isolation cylinders 101 is the same as the number of output ports of the intermediate switch. A gas storage tank 201 is fixedly installed between the installation plate 3 and the electrical box 1, and the gas storage tank 201 is filled with liquid carbon dioxide. To prevent fire in case of overload and short circuit of main switch 2, a flame-retardant ejection device is provided between isolation cylinder 101 and gas tank 201. A diversion sleeve 203 is fixedly connected to the bottom end of gas tank 201, and an output pipe 202 is fixedly connected to the outer surface of diversion sleeve 203. Multiple rectangular sliding holes are opened on the outer surface of mounting plate 3. The rectangular sliding holes are located on the upper and lower sides of air switch 4, and multiple movable blocks 401 are slidably installed in the rectangular sliding holes. The number of movable blocks 401 is determined according to the number of ports of air switch 4.

[0019] like Figures 4-6As shown, the flame-retardant ejection device includes a accumulator 107, which is fixedly installed on the outer surface of the mounting plate 3 (not shown in the figure). A locking rod 108 is inserted through the inner end of the accumulator 107. Multiple fixing sleeves 111 are slidably installed on the upper end of the main switch 2. The fixing sleeves 111 are in contact with the port of the main switch 2. The power supply cable is connected to the fixing sleeves 111. The fixing sleeves 111 are made of metal. An ejection rod 109 is fixedly welded to the outer surface of the fixing sleeves 111. The ejection rod 109 is connected to the mounting plate 3 through a trigger spring 110. In the default state, the trigger spring 110 is in a compressed state. When the trigger spring 110 releases its elastic force, it drives the fixing sleeves 111 to move, so that the power supply cable no longer supplies power to the main switch 2. Specifically, when the fixing sleeves 111 are pushed by the trigger spring 110, they will not detach from the main switch 2, but only disconnect from the port of the main switch 2. The outer surface of the ejector rod 109 has a through hole, and the locking rod 108 on the side away from the accumulator 107 passes through the through hole to prevent the ejector rod 109 from moving. A three-way pipe 114 is fixedly connected to the bottom end of the accumulator 107. An extension pipe 106 is fixedly connected to the side input end of the three-way pipe 114, and the extension pipe 106 is fixedly connected to the output pipe 202. A locking sleeve 105 is fixedly connected to the end of the three-way pipe 114 away from the accumulator 107. A guide pipe 104 is fixedly connected to the outer surface of the isolation cylinder 101. An adjusting screw sleeve 115 is rotatably installed at the end of the guide pipe 104, and the locking sleeve 105 is threaded onto the outer surface of the adjusting screw sleeve 115. The guide pipe 104 is made of soft silicone, which is corrosion resistant and has a certain degree of flexibility. The accumulator 107 has a movable plug 112 inside. The movable plug 112 is fixedly connected to the locking rod 108, and the movable plug 112 is connected to the accumulator 107 through a return spring. In the default state, when the locking rod 108 passes through the through hole on the outer surface of the pop-out rod 109, the return spring is in a compressed state.

[0020] Example 2: Please refer to Figures 4-6 A power switch cabinet with protective function, based on embodiment 1, has a conductor tube 113 fixedly installed at the upper end of the adjusting screw sleeve 115. The conductor tube 113 passes through the inside of the three-way pipe 114. The top end of the conductor tube 113 is sealed. A through hole is opened on the outer surface of the conductor tube 113. When the conductor tube 113 moves upward, its through hole enters the inside of the accumulator 107, so that the accumulator 107 is connected to the locking sleeve 105. When the guide tube 113 moves down and its upper end reaches below the side inlet of the three-way tube 114, the extension tube 106 connects with the inside of the accumulator 107. By rotating the adjusting screw sleeve 115, the guide tube 113 can be moved up or down. An isolation block 301 is fixedly installed on the inner end of the adjusting screw sleeve 115. A support sleeve 303 is fixedly installed inside the guide tube 104, and a liquid reservoir 302 is provided between the support sleeve 303 and the isolation block 301. The liquid reservoir 302 is filled with an expanding agent, which expands rapidly upon contact with air and has excellent insulation properties. The liquid reservoir 302 is made of a soft film, which is easily torn by force or punctured by a sharp object. A sealing cap 304 is provided on the inner end of the support sleeve 303. The sealing cap 304 separates the upper and lower spaces of the support sleeve 303, and the upper end of the sealing cap 304 is fixedly connected to the liquid reservoir 302. If the sealing cap 304 moves downward rapidly, it will tear open the liquid reservoir 302. Specifically, the sealing cap 304 and the support sleeve 303 are connected by a spring clip.

[0021] like Figures 6-8 As shown, a sealing cap 305 is inserted inside the isolation block 301. Multiple arc-shaped guide grooves are opened at the inner end of the isolation block 301. Locking springs 306 are inserted into each arc-shaped guide groove. The locking springs 306 are arranged in a ring (the locking springs 306 are initially in a vertical state). After the locking springs 306 are inserted into the arc-shaped guide grooves, they deform along the guide and move upward, so that the top end contacts the bottom end of the sealing cap 305. A pad is fixedly installed at the end of each locking spring 306 away from the isolation block 301. The pad contacts the top of the liquid storage bladder 302. Multiple clamping plates 117 are fixedly installed at the inner end of the isolation cylinder 101. The clamping plates 117 are connected to the output port of the main switch 2 and are arranged in a ring. A terminal block 102 is provided at the bottom of the isolation cylinder 101. A pin 118 is fixedly connected to one end of the terminal block 102 near the isolation cylinder 101. The pin 118 is connected to the isolation cylinder 101 through an auxiliary spring 103. When the pin 118 moves upward and passes through the clamping plate 117, it forces the clamping plate 117 to undergo elastic deformation in all directions.

[0022] The inner end of the isolation cylinder 101 is fitted with a fixing bladder 116, which wraps around multiple clamping plates 117 and is connected to the guide tube 104. Specifically, when a short circuit or overload occurs in the line, the current generates concentrated heat at the contact point. This heat continues to accumulate until it reaches the melting point of the fixing bladder 116 made of soft rubber, causing it to melt. More specifically, the fixation bladder 116 is filled with air. When the pin 118 passes through the multiple clamping plates 117, the clamping plates 117 deform in all directions and compress the fixation bladder 116. Subsequently, after the fixation bladder 116 is compressed, the internal air transmits the pressure to the sealing cover 304 through the guide tube 104. The sealing cover 304 moves upward, compressing the spring between the sealing cover and the support sleeve 303. At the same time, the sealing cover 304 moves upward and compresses the liquid reservoir 302. The liquid reservoir 302 transmits the pressure to the locking spring 306, driving the locking spring 306 to move and limit the sealing cover 305. It is worth noting that when the pin 118 is inserted into the locking plate 117, it will be simultaneously subjected to the rebound resistance of the locking plate 117 and the pressure resistance of the fixing bladder 116. The combined effect of the two resistances causes the locking plate 117 to tightly clamp the pin 118. At this time, the friction between the two is greater than the reset force of the auxiliary spring 103, so that the mechanism is stably locked.

[0023] Example 3: Please refer to Figure 2 , Figure 4 , Figure 9 , Figure 10 As shown, a power switch cabinet with protective function, based on embodiments 1 and 2, is connected to the gas storage tank 201 via a valve (not shown in the figure). A guide block 206 is rotatably installed on the inner end of the diverter sleeve 203. A guide hole is opened on the outer surface of the guide block 206. After the guide block 206 is rotated, the guide hole is connected to the output pipe 202. At this time, the carbon dioxide inside the gas storage tank 201 will flow into the interior of the output pipe 202 through the diverter sleeve 203. It is worth noting that the position of the gas storage tank 201 is higher than that of the accumulator 107, and the carbon dioxide liquid will flow into the interior of the accumulator 107 under the action of gravity. An adjusting block 204 is rotatably mounted on the outer surface of the mounting plate 3. A worm gear 208 is fixedly connected to the bottom end of the flow guide block 206. A worm 207 is fixedly connected to one end of the adjusting block 204 near the flow divider sleeve 203, and the worm 207 meshes with the worm gear 208. By rotating the adjusting block 204 with a wrench, the worm 207 drives the worm gear 208 to rotate, and finally the flow guide block 206 rotates.

[0024] like Figure 3 , Figure 9 , Figure 11 As shown, a rubber sleeve 403 is inserted through the inner end of the movable block 401. The rubber sleeve 403 is stuck inside the movable block 401 and cannot be pushed out. The end away from the movable block 401 is sleeved on the outer surface of the output cable of the air switch 4. After the rubber sleeve 403 is heated and melted, it can be detached from the interior of the movable block 401. A buffer cylinder 402 is fixedly connected to the end of the movable block 401 away from the rubber sleeve 403. The interior of the buffer cylinder 402 is also filled with an expanding agent. A trigger plug 404 is sleeved inside the buffer cylinder 402. The output port of the diverter sleeve 203 is fixedly connected to the diverter pipe 205, and the input end of the buffer cylinder 402 is connected to the diverter pipe 205. The pressure inside the gas storage tank 201 is directly applied to the trigger plug 404 through the diverter pipe 205.

[0025] The working principle of this invention is: During operation, if the main switch 2 is overloaded, the contact point between the card plate 117 and the pin 118 will heat up. When the temperature reaches the melting temperature of the fixing bladder 116, the fixing bladder 116 will break open. Then, during the reset process, the spring quickly pushes the sealing cover 304 away from the support sleeve 303. During the movement, the sealing cover 304 tears open the liquid reservoir 302, allowing the internal expansion agent to flow out. At the same time, the locking spring 306 is no longer squeezed by the liquid reservoir 302 and no longer limits the sealing cover 305 during the recovery process. At this time, the liquid carbon dioxide inside the accumulator 107 rapidly vaporizes and expands. Under the action of pressure, the expansion agent is pushed out of the guide tube 104 and then adheres to the outer surface of the card plate 117 and the pin 118. After the pin 118 is driven by the auxiliary spring 103 to disengage from the card plate 117, the expansion agent rapidly expands and seals and isolates the card plate 117, effectively avoiding the risk of secondary electric shock and short circuit. Subsequently, the movable plug 112 moves downward under the elastic force of the return spring. When the locking rod 108 is removed, the pop-out rod 109 is released, and the fixed sleeve 111, driven by the trigger spring 110, drives the power cable to disconnect from the main switch 2, thus completing the power cut-off. After inspecting the leakage fault, the staff cleaned the expansion agent and replaced the guide tube 104, the fixing bladder 116 and the liquid storage bladder 302. They then rotated the adjusting screw sleeve 115 to move the connecting tube 113 downward. When the upper end of the connecting tube 113 reached below the side inlet of the three-way tube 114, the extension tube 106 connected with the inside of the accumulator 107. At this time, the liquid carbon dioxide inside the gas storage tank 201 flowed back into the accumulator 107 under the action of gravity. Then, under the action of pressure, the locking rod 108 was pushed upward and the ejector rod 109 was locked again. The adjusting screw sleeve 115 was then reset so that the connecting hole on the outer surface of the connecting tube 113 was exposed inside the accumulator 107 again. If the cable at air switch 4 is overloaded and ignites, the rubber sleeve 403 will melt due to heat. At this time, the trigger plug 404 will quickly squeeze out the expansion agent inside the buffer cylinder 402 and spray it onto the outer surface of the cable end through the movable block 401. Then, the air switch 4 will trip and cut off the power. Subsequently, the trigger plug 404 will move down and misalign with the output port of the movable block 401 to form a gap, so that the carbon dioxide in the gas tank 201 will continue to flow out to prevent reignition. Finally, it awaits repair or replacement by staff.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A power switchgear with protective functions, comprising an electrical box (1), characterized in that: The inner end of the electrical box (1) is detachably equipped with an installation plate (3). The outer surface of the installation plate (3) is fixedly equipped with a main switch (2). The outer surface of the installation plate (3) is also fixedly equipped with multiple air switches (4). The outer surface of the installation plate (3) is fixedly equipped with multiple isolation cylinders (101). The isolation cylinders (101) are located below the main switch (2). A gas storage tank (201) is fixedly installed between the installation plate (3) and the electrical box (1). A flame-retardant ejection device is provided between the isolation cylinder (101) and the gas storage tank (201). A diversion sleeve (203) is fixedly connected to the bottom end of the gas storage tank (201). An output pipe (202) is fixedly connected to the outer surface of the diversion sleeve (203). Multiple rectangular sliding holes are opened on the outer surface of the installation plate (3). The rectangular sliding holes are located on the upper and lower sides of the air switch (4). Multiple movable blocks (401) are slidably installed in the rectangular sliding holes. The number of movable blocks (401) is determined according to the number of ports of the air switch (4).

2. A power switchgear with protective function according to claim 1, characterized in that: The flame-retardant ejection device includes a power storage cylinder (107), which is fixedly installed on the outer surface of the mounting plate (3). A locking rod (108) is provided through the inner end of the power storage cylinder (107). A three-way pipe (114) is fixedly connected to the bottom end of the power storage cylinder (107). An extension pipe (106) is fixedly connected to the side input end of the three-way pipe (114), and the extension pipe (106) is fixedly connected to the output pipe (202). A locking sleeve (105) is fixedly connected to the end of the three-way pipe (114) away from the power storage cylinder (107).

3. A power switchgear with protective function according to claim 2, characterized in that: The outer surface of the isolation cylinder (101) is fixedly connected to a guide tube (104), and an adjusting sleeve (115) is rotatably installed at the end of the guide tube (104). The locking sleeve (105) is threaded onto the outer surface of the adjusting sleeve (115). The inside of the accumulator (107) is provided with a movable plug (112). The movable plug (112) is fixedly connected to the locking rod (108), and the movable plug (112) is connected to the accumulator (107) through a return spring.

4. A power switchgear with protective function according to claim 3, characterized in that: The upper end of the adjusting screw sleeve (115) is fixedly installed with a guide tube (113). The guide tube (113) passes through the inside of the three-way pipe (114). The outer surface of the guide tube (113) is provided with a guide hole. When the guide tube (113) moves upward, its guide hole enters the inside of the accumulator (107), thereby connecting the accumulator (107) with the locking sleeve (105).

5. A power switchgear with protective function according to claim 4, characterized in that: An isolation block (301) is fixedly installed on the inner end of the adjusting screw sleeve (115), a support sleeve (303) is fixedly installed inside the guide tube (104), and a liquid storage bladder (302) is provided between the support sleeve (303) and the isolation block (301). A sealing cap (304) is provided on the inner end of the support sleeve (303), and the sealing cap (304) separates the space on the upper and lower sides of the support sleeve (303).

6. A power switchgear with protective function according to claim 5, characterized in that: The isolation block (301) is provided with a sealing cap (305) inside. The inner end of the isolation block (301) is provided with multiple arc-shaped guide grooves. Each arc-shaped guide groove is provided with a locking spring (306). The locking spring (306) is arranged in a ring. After the locking spring (306) enters the arc-shaped guide groove, it deforms along the guide and moves upward so that the top end contacts the bottom end of the sealing cap (305). The ends of the multiple locking springs (306) away from the isolation block (301) are all fixedly installed with pads. The pads are in contact with the top of the liquid storage bladder (302).

7. A power switchgear with protective function according to claim 1, characterized in that: Multiple clamping plates (117) are fixedly installed at the inner end of the isolation cylinder (101), and the clamping plates (117) are arranged in a ring. A wiring terminal (102) is provided at the bottom of the isolation cylinder (101). A pin (118) is fixedly connected to one end of the wiring terminal (102) near the isolation cylinder (101). When the pin (118) moves upward and passes through the clamping plate (117), it forces the clamping plate (117) to undergo elastic deformation in all directions. A fixing bladder (116) is sleeved at the inner end of the isolation cylinder (101). The fixing bladder (116) wraps the multiple clamping plates (117), and the fixing bladder (116) is connected to the guide tube (104).

8. A power switchgear with protective function according to claim 1, characterized in that: A guide block (206) is rotatably installed on the inner end of the diverting sleeve (203). A guide hole is opened on the outer surface of the guide block (206). After the guide block (206) is rotated, the guide hole is connected to the output pipe (202). An adjusting block (204) is rotatably installed on the outer surface of the mounting plate (3). A worm wheel (208) is fixedly connected to the bottom end of the guide block (206). A worm (207) is fixedly connected to the end of the adjusting block (204) near the diverting sleeve (203), and the worm (207) meshes with the worm wheel (208).

9. A power switchgear with protective function according to claim 8, characterized in that: The inner end of the movable block (401) is provided with a rubber sleeve (403), and the end of the movable block (401) away from the rubber sleeve (403) is fixedly connected to a buffer cylinder (402). The inside of the buffer cylinder (402) is provided with a trigger plug (404). The output port of the diverter sleeve (203) is fixedly connected to a diverter pipe (205), and the input end of the buffer cylinder (402) is connected to the diverter pipe (205).

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