Internal standard fire extinguishing device for switch cabinet and switch cabinet

Abstract

The utility model belongs to the field of power distribution equipment, and particularly provides an internal standard fire extinguishing device for a switch cabinet and the switch cabinet, the internal standard fire extinguishing device is arranged between a rear cabinet door and an electric appliance element, and the internal standard fire extinguishing device comprises a baffle door arranged on the inner side wall of the switch cabinet, and a fire extinguishing agent storage tank and an induction nozzle which are arranged on the baffle plate, the blocking door is rotationally arranged on the inner side wall of the switch cabinet through the sliding table and comprises an overhauling position and a working position, the blocking door is parallel to the inner side wall of the switch cabinet at the overhauling position, and the blocking door is perpendicular to the inner side wall of the switch cabinet at the working position; the fire extinguishing device is directly arranged in the switch cabinet through the blocking door, when the blocking door is in the working position, the blocking door can provide further protection for electrical components in the cabinet and isolate a fire source from the fire extinguishing agent storage tank, and the fire extinguishing agent storage tank cannot be directly influenced when the electrical components are on fire; the device can be arranged in the middle of an electric appliance cabinet and directly faces the position of an electric appliance element without additional wiring and pipe arrangement, so that the fire extinguishing agent can directly act on the electric appliance element, and fire extinguishing can be carried out more quickly and efficiently.

Description

Technical Field

[0001] This utility model belongs to the field of power distribution equipment, and specifically provides an internal fire extinguishing device and switch cabinet for use in switch cabinets. Background Technology

[0002] Switchgear is a complete set of equipment in an electrical system used to receive and distribute electrical energy. It includes switches, protective devices, measuring instruments, and other auxiliary equipment. Because switchgear contains electrical components such as busbars, circuit breakers, and relays, it is crucial in the application of electrical equipment. Switchgear can catch fire due to various reasons, including aging of internal electrical components, burning of busbar aluminum contacts, loss of RTO fuses, and rainwater intrusion into the cabinet. If not handled promptly, this can lead to serious safety accidents.

[0003] Existing switchgear systems are equipped with automatic fire extinguishing devices, such as fire detection tubes, for automated emergency fire suppression. To prevent the high temperatures during a fire from affecting the high-pressure tanks storing extinguishing materials, the main body of the fire extinguishing device is usually located outside the cabinet. However, in large-scale switchgear systems, multiple cabinets such as incoming line cabinets, feeder cabinets, capacitor cabinets, and busbar cabinets are arranged side by side. There is no spare space outside the middle cabinets to place the fire extinguishing device. The fire extinguishing devices can only be uniformly placed outside the cabinets at the ends of the switchgear system. This results in a certain delay when extinguishing fires in cabinets that are far away, and the extinguishing agent can only be released from a fixed position at the top of the cabinet. Effective extinguishing can only be achieved after the extinguishing agent fills the entire switchgear. The effect is slow, the targeting is poor, and it is easy to delay the fire extinguishing opportunity, which can lead to damage to important parts of the switchgear and cause huge losses. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an internal fire extinguishing device and a switch cabinet for use in switch cabinets. By installing a movable fire extinguishing device inside the cabinet, the fire extinguishing efficiency in the event of a fire is improved.

[0005] The technical solution of this utility model is as follows:

[0006] An internal fire extinguishing device for a switch cabinet is installed between the rear door and electrical components. It includes a stop door on the inner wall of the switch cabinet and a fire extinguishing agent tank and a sensor nozzle on the stop plate. The stop door is rotatably mounted on the inner wall of the switch cabinet via a sliding table. The stop door has a maintenance position and a working position. In the maintenance position, the stop door is parallel to the inner wall of the switch cabinet, and in the working position, the stop door is perpendicular to the inner wall of the switch cabinet.

[0007] In this design, the barrier door provides an installation location for the fire extinguishing agent tank and the sensor-operated sprinkler head inside the cabinet. The fire extinguishing device is directly installed inside the switchgear via the movable barrier door. When the barrier door is in the working position, it provides further protection for the electrical components inside the cabinet while also indirectly isolating the fire source from the fire extinguishing agent tank. A fire in the electrical components will not directly affect the fire extinguishing agent tank. Furthermore, no additional wiring or conduit is required to position the sensor-operated sprinkler head in the middle of the electrical cabinet, directly opposite the electrical components. The extinguishing agent can directly act on the electrical components, resulting in faster and more efficient fire suppression. Additionally, when routine maintenance is required inside the switchgear, rotating the barrier door to the maintenance position allows the fire extinguishing agent tank and sensor-operated sprinkler head to be moved to one side of the switchgear without obstructing maintenance personnel.

[0008] Preferably, the fire extinguishing agent container is housed within a protective cylinder, which is fixedly positioned on one side of the door. The sensor-operated nozzle is connected to the fire extinguishing agent container and correspondingly positioned on the other side of the door. When the door is in the working position, the protective cylinder is located on the side of the door closest to the rear cabinet door, and the output port of the sensor-operated nozzle faces the electrical components. The protective cylinder further protects the fire extinguishing agent container, preventing it from malfunctioning due to external influences.

[0009] Preferably, the sensing nozzle includes multiple nozzles distributed radially and circumferentially, the multiple nozzles are interconnected, the nozzles are provided with nozzles at the ends, and the nozzles and the outlet of the fire extinguishing agent tank are provided with container valves, the container valves are automatically opened after the sensing device senses the fire source.

[0010] In this scheme, multiple nozzles can be aimed directly at electrical components in the same location. When the sensing device detects a fire, the corresponding container valve automatically opens to extinguish the fire in the target area. When the fire inside the cabinet is large, the fire extinguishing agent tank outputs the fire extinguishing agent from multiple nozzles through multiple nozzles, improving the coverage of the fire extinguishing agent and thus the efficiency of fire extinguishing. When using a vaporized fire extinguishing agent, the speed at which the fire extinguishing agent fills the switch cabinet and extinguishes the fire can also be increased.

[0011] Preferably, the nozzle is a telescopic pipe, comprising a first pipe and a second pipe slidably sleeved within the first pipe. A shaft is provided at the axis of the second pipe, and a fire extinguishing agent delivery pipe spirally surrounds the shaft and connects the nozzle and the fire extinguishing agent storage tank. In this design, by adjusting the nozzle length, the nozzle can cover a wider range of electrical components. Simultaneously, the spiral arrangement of the fire extinguishing agent delivery pipe around the shaft provides a certain degree of extension and retraction capacity within the nozzle, preventing bending or compression of the fire extinguishing agent delivery pipe during nozzle extension and retraction, and preventing blockage or damage to the fire extinguishing agent delivery pipe due to physical reasons.

[0012] To avoid insufficient pressure and flow supply to a single fire extinguishing agent tank due to too many nozzles, and to ensure the reliability of the device and reduce maintenance difficulty, preferably, one induction nozzle includes two nozzles, with the first nozzle of the two nozzles being the same tee pipe.

[0013] Preferably, the slide table is fixedly installed on the inner side wall of the switch cabinet, the slide table is provided with a horizontal slide groove, the horizontal slide groove is provided with a sliding block, and the stop door is rotatably connected to the sliding block.

[0014] Preferably, one end of the barrier door is slidably mounted on two sliding platforms. When the barrier door is in the maintenance position, the fire extinguishing agent tank is located in the cavity formed by the two sliding platforms, the barrier plate, and the inner wall of the switch cabinet.

[0015] In this design, the door can rotate and slide horizontally along the sliding platform. When in the maintenance position, the door, along with the fire extinguishing agent tank and the sensor nozzle, can be neatly stored against the inner wall of the low-voltage cabinet, without being exposed outside the cabinet or obstructing maintenance personnel from inspecting the interior. In the working state, the door slides as close as possible to the rear cabinet door, ensuring that the fire extinguishing agent tank and sensor nozzle do not interfere with or affect the installation of internal components. Furthermore, when switching between the two positions, the door's rotation and sliding can occur simultaneously, preventing it from occupying excessive space within the cabinet or protruding from the cabinet, thus ensuring the fire extinguishing device can be used in low-voltage cabinets placed in confined spaces.

[0016] Since the fire extinguishing gate is mounted on the inner wall of the low-voltage switchgear, an excessively large turning angle could cause the gate to collide with the electrical components inside the switchgear. Therefore, preferably, a vertical bending plate is provided at the connection between the gate and the sliding table, making the gate "L"-shaped. This vertical bending plate limits the gate's rotation angle. When the vertical bending plate is parallel to the inner wall of the low-voltage switchgear, the gate body is perpendicular to the inner wall and parallel to the mounting surface of the electrical components inside the switchgear, allowing the nozzle to spray the extinguishing agent directly onto the electrical components. Furthermore, due to the restriction of the vertical bending plate, the gate can only rotate a maximum of 90°, preventing excessive rotation and potential collision with the electrical components.

[0017] Preferably, the horizontal slide groove is provided with an elastic member, which provides a force to the sliding block to slide towards the rear cabinet door, and the door stop is provided with a limit unit to maintain the door stop in the maintenance position and the working position.

[0018] A switch cabinet includes the aforementioned internal fire extinguishing device for the switch cabinet, and also includes a cabinet body. The internal fire extinguishing device for the switch cabinet is disposed on one side of the inner side wall of the cabinet body or symmetrically disposed on the two inner side walls of the cabinet body.

[0019] In this design, the fire extinguishing device is directly installed inside the switchgear cabinet. Instead of conventionally placing the device on a baffle near the rear door, this design isolates the fire extinguishing agent tank while ensuring the nozzles of the device are directly aimed at the electrical components inside the cabinet. The device can also be moved away by rotating the baffle, avoiding disruption to switchgear maintenance. For narrower switchgear cabinets, only one internal fire extinguishing device can be installed. For wider cabinets, to prevent excessively large or long doors from interfering with other structures and electrical components during repositioning, two such fire extinguishing devices are symmetrically installed. This reduces the size of individual doors and avoids insufficient fire coverage and speed from a single device.

[0020] The beneficial effects of this utility model are:

[0021] 1. The door of this utility model provides an installation position for the fire extinguishing agent tank and the sensor nozzle inside the cabinet. The fire extinguishing device is directly installed inside the switch cabinet through the door. When the door is in the working position, it can provide further protection for the electrical components inside the cabinet, while also indirectly isolating the fire source from the fire extinguishing agent tank. When the electrical components catch fire, it will not directly affect the fire extinguishing agent tank. The device can be installed in the middle of the electrical cabinet, directly opposite the electrical components, without the need for additional wiring and piping. This allows the fire extinguishing agent to act directly on the electrical components, enabling more rapid and efficient fire extinguishing.

[0022] 2. When routine maintenance is required inside the switchgear, the fire extinguishing agent tank and the sensor nozzle can be rotated to the side of the switchgear by rotating the stop door to the maintenance position, which will not affect the maintenance personnel from carrying out maintenance inside the cabinet. Attached Figure Description

[0023] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional schematic diagram of the device of this utility model;

[0025] Figure 2 This is a front view of the working position of this utility model;

[0026] Figure 3 This is a side view of the storage location of this utility model;

[0027] Figure 4 This is a perspective view of another embodiment of the present utility model;

[0028] Figure 5 This is a cross-sectional view of the low-voltage switchgear of this utility model.

[0029] In the above figures, the corresponding reference numerals are as follows:

[0030] 1-Block door, 11-Vertical curved plate, 12-Limiting unit, 121-U-shaped buckle, 122-Limiting groove, 123-Limiting curved column, 13-Cable hole, 2-Fire extinguishing agent storage tank, 3-Induction nozzle, 31-Spray pipe, 311-No. 1 pipe, 312-No. 2 pipe, 313-Shaft, 314-Fire extinguishing agent delivery pipe, 32-Nozzle, 33-Container valve, 4-Slide table, 41-Horizontal slide groove, 42-Sliding block, 43-Elastic component, 5-Cabinet, 51-Inner wall of switch cabinet, 52-Rear cabinet door, 6-Electrical components, 7-Protective cylinder. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings and through specific implementation methods of the embodiments of the present invention.

[0032] Example 1:

[0033] like Figure 1 The diagram shows an internal fire extinguishing device for a switch cabinet, installed between the rear cabinet door 52 and the electrical components 6. It includes a stop door 1 set on the inner wall 51 of the switch cabinet, a fire extinguishing agent tank 2 and a sensor nozzle 3 set on the baffle. The stop door 1 is rotatably mounted on the inner wall 51 of the switch cabinet via a slide table 4. The stop door 1 includes a maintenance position and a working position. In the maintenance position, the stop door 1 is parallel to the inner wall 51 of the switch cabinet, and in the working position, the stop door 1 is perpendicular to the inner wall 51 of the switch cabinet.

[0034] Specifically, the fire extinguishing agent storage tank 2 preferably uses perfluorohexanone fire extinguishing agent. The fire extinguishing agent storage tank 2 is set in the protective cylinder 7. An isolation layer, including but not limited to heat insulation cotton, aerogel felt, etc., is provided between the protective cylinder 7 and the fire extinguishing agent storage tank 2. The protective cylinder 7 consists of a placement seat and a limiting shell. One end of the limiting shell is rotatably connected to the placement seat, and the other end is detachably connected to the placement seat by a buckle, so as to facilitate the loading and unloading of the fire extinguishing agent storage tank 2. The protective cylinder 7 further protects the fire extinguishing agent storage tank 2 and prevents it from failing due to external influences.

[0035] Furthermore, the protective cylinder 7 is fixedly installed on one side of the barrier door 1, and the sensing nozzle 3 is connected to the fire extinguishing agent tank 2 and correspondingly installed on the other side of the barrier door 1. When the barrier door 1 is in the working position, the protective cylinder 7 is located on the side of the barrier door 1 closest to the rear cabinet door 52, and the output port of the sensing nozzle 3 faces the electrical component 6. The sensing nozzle 3 includes multiple nozzles 31 radially circumferentially distributed, which are interconnected. The nozzles 31 are provided with nozzles 32 at their ends, and both the nozzles 32 and the outlet of the fire extinguishing agent tank 2 are provided with container valves 33. The container valve 33 automatically opens after the sensing device detects a fire source. The sensing device on the sensing nozzle 3 that controls the opening of the container valve 33 is preferably a flexible fire detection tube. Furthermore, the nozzle 31 is a telescopic pipe, including a first pipe 311 and a second pipe 312 slidably sleeved in the first pipe 311. A shaft 313 is provided at the pipe shaft of the second pipe 312. The extinguishing agent delivery pipe 314 is spirally arranged around the shaft 313 and connects the nozzle 32 and the extinguishing agent storage tank 2.

[0036] In this embodiment, to avoid insufficient pressure and flow supply to a single fire extinguishing agent tank 2 due to too many nozzles 31, and to ensure the reliability of the device and reduce maintenance difficulty, a sensing nozzle 3 is provided, including two nozzles 31, with the first nozzle 311 of the two nozzles being the same three-way pipe. Specifically, as shown... Figures 2 to 4 As shown, by controlling the length of the nozzles 31, one nozzle 31 is positioned upwards and the other downwards, respectively serving the upper and lower halves of the switchgear. Furthermore, the fire detection tubes can run from the container valve 33 along the inner wall of the switchgear, and are respectively installed on the upper and lower halves of the mounting surface of the electrical components 6. Since the fire detection tubes are filled with pressurized gas, when a nearby electrical component 6 catches fire, the corresponding fire detection tube will rupture due to heat, causing the corresponding container valve 33 to activate, allowing the nozzle 32 to output the extinguishing agent. Of course, to avoid accidental activation, a container valve 33 can also be installed at the outlet of the extinguishing agent storage tank 2. This container valve 33 can also be controlled by the fire detection tube, but the fire detection tube at the outlet of the extinguishing agent storage tank 2 needs to be installed on the entire mounting surface of the electrical components 6.

[0037] It should be noted that in this embodiment, the nozzle 31 is not a pipeline for directly delivering the extinguishing agent, but rather serves as a protective outer shell for the extinguishing agent delivery pipe 314, which is responsible for delivering the extinguishing agent. The extinguishing agent delivery pipe 314 spirally wraps around the shaft 313, giving the extinguishing agent delivery pipe 314 within the nozzle 31 a certain degree of extension and retraction capacity. This prevents the extinguishing agent delivery pipe 314 from bending or being squeezed during the extension and retraction of the nozzle 31, and prevents blockage or damage to the extinguishing agent delivery pipe 314 due to physical reasons.

[0038] Example 2:

[0039] Based on Example 1, to ensure that the fire extinguishing device is installed in the switch cabinet without affecting other components inside the cabinet and without occupying excessive space, such as... Figure 3 As shown, the slide table 4 is fixedly installed on the inner side wall 51 of the switch cabinet. The slide table 4 is provided with a horizontal slide groove 41, and a sliding block 42 is provided in the horizontal slide groove 41. The stop door 1 is rotatably connected to the sliding block 42.

[0040] Specifically, one end of the barrier door 1 is slidably mounted on two sliding tables 4. When the barrier door 1 is in the maintenance position, the fire extinguishing agent tank 2 is located in the cavity formed by the two sliding tables 4, the baffle, and the inner wall 51 of the switch cabinet.

[0041] Furthermore, since the stop door 1 is rotatably mounted on the inner wall of the low-voltage cabinet, an excessively large turning angle could cause the stop door 1 to collide with the electrical components 6 inside the switch cabinet. Therefore, preferably, a vertical bending plate 11 is provided at the connection between the stop door 1 and the slide table 4, making the stop door 1 "L"-shaped. The vertical bending plate 11 is used to limit the rotation angle of the stop door 1. When the vertical bending plate 11 is parallel to the inner wall of the low-voltage cabinet, the main body of the stop door 1 can be perpendicular to the inner wall of the low-voltage cabinet and parallel to the mounting surface of the electrical components 6 inside the cabinet, allowing the nozzle to spray the extinguishing agent directly onto the electrical components 6. Due to the restriction of the vertical bending plate 11, the stop door 1 can only rotate a maximum of 90°, preventing excessive rotation and collision with the electrical components 6. It should be noted that, to facilitate the wiring of the fire detection tube in this embodiment, a wiring hole 13 is provided on the vertical bending plate 11.

[0042] Furthermore, in order to maintain the door stop 1 in the maintenance position and the working position, an elastic member 43 is provided in the horizontal slide 41. The elastic member 43 gives the sliding block 42 a force to slide towards the rear cabinet door 52. A limit unit 12 is provided on the door stop 1.

[0043] Specifically, as shown in the figure Figures 1 to 3 As shown, a limiting groove 122 is provided at one end of the slide table 4 near the rear cabinet door 52. A limiting bent post 123 is slidably inserted into the limiting groove 122. The stop door 1 is provided with a U-shaped buckle 121 that matches the limiting groove 122. When the stop door 1 is in the maintenance position, the U-shaped buckle 121 is inserted into the limiting groove 122, and the limiting bent post 123 can be inserted into the U-shaped groove of the U-shaped buckle 121, locking the U-shaped buckle 121 in the limiting groove 122. Preferably, the opening of the U-shaped buckle 121 is set upward, so that the limiting bent post 123 can be inserted downward into the U-shaped groove of the U-shaped buckle 121 by its own weight, while restricting the sliding of the sliding block 42 and the rotation of the stop door 1.

[0044] When the stop door 1 is in the working position, the movement of the sliding block 42 and the rotation of the stop door 1 must also be restricted. To this end, a pull rope spring is provided between the sliding block 42 and the horizontal slide groove 41. The pull rope spring applies a force to the sliding block 42 towards the rear cabinet door 52, ensuring that the sliding block 42 remains at the end of the horizontal slide groove 41 closest to the rear cabinet door 52 unless subjected to external forces other than gravity. For the rotation of the stop door 1, a magnetic attraction unit is provided on the U-shaped buckle 121 on the stop door 1, and a corresponding magnetic attraction unit is provided on the side wall of the other side of the low-voltage cabinet. The two magnetic attraction units attract each other, requiring the stop door 1 to overcome the attractive force of the magnetic attraction units to rotate.

[0045] Example 3:

[0046] Based on the above embodiments, a switch cabinet, such as Figure 5 As shown, the device includes the aforementioned internal fire extinguishing device for a switch cabinet, and also includes a cabinet body 5. The internal fire extinguishing device for the switch cabinet is installed on one side of the inner wall of the cabinet body 5 or symmetrically installed on both inner walls of the cabinet body 5.

[0047] Specifically, the fire extinguishing device is directly installed inside the switchgear cabinet. The baffle near the rear door 52 is not a conventional placement of the fire extinguishing device on the baffle. This isolates the fire extinguishing agent tank 2 while ensuring the nozzle of the fire extinguishing device can be directly aimed at the electrical components 6 inside the switchgear. The fire extinguishing device can also be moved away by rotating the storage baffle, avoiding interference with switchgear maintenance. For narrower switchgear, only one internal fire extinguishing device can be installed. For wider switchgear, to avoid the door 1 being too large or too long, causing interference with other structures and electrical components 6 during position changes, such as... Figure 4 As shown, two of these fire extinguishing devices can be symmetrically installed to reduce the size of a single barrier door 1 and avoid the problem of insufficient fire extinguishing coverage and speed of a single fire extinguishing device.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An internal fire extinguishing device for switchgear, characterized in that: Installed between the rear cabinet door (52) and electrical components (6), it includes a stop door (1) set on the inner wall (51) of the switch cabinet and a fire extinguishing agent tank (2) and a sensor nozzle (3) set on the baffle. The stop door (1) is rotatably set on the inner wall (51) of the switch cabinet via a slide (4). The stop door (1) includes a maintenance position and a working position. In the maintenance position, the stop door (1) is parallel to the inner wall (51) of the switch cabinet, and in the working position, the stop door (1) is perpendicular to the inner wall (51) of the switch cabinet.

2. The internal fire extinguishing device for switchgear according to claim 1, characterized in that: The fire extinguishing agent container (2) is installed in the protective cylinder (7). The protective cylinder (7) is fixedly installed on one side of the door (1). The sensor nozzle (3) is connected to the fire extinguishing agent container (2) and is correspondingly installed on the other side of the door (1). When the door (1) is in the working position, the protective cylinder (7) is on the side of the door (1) close to the rear cabinet door (52). The output port of the sensor nozzle (3) is facing the electrical component (6).

3. The internal fire extinguishing device for switchgear according to claim 2, characterized in that: The sensing nozzle (3) includes multiple nozzles (31) arranged radially and circumferentially. The multiple nozzles (31) are interconnected. A nozzle (32) is provided at the end of the nozzle (31). A container valve (33) is provided at the outlet of the nozzle (32) and the fire extinguishing agent tank (2). The container valve (33) automatically opens after the sensing device senses the fire source.

4. The internal fire extinguishing device for switchgear according to claim 3, characterized in that: The nozzle (31) is a telescopic pipe, including a first pipe (311) and a second pipe (312) slidably sleeved in the first pipe (311). A shaft (313) is provided at the pipe axis of the second pipe (312). The extinguishing agent delivery pipe (314) is spirally arranged around the shaft (313) and connects the nozzle (32) and the extinguishing agent storage tank (2).

5. The internal fire extinguishing device for switchgear according to claim 4, characterized in that: A sensor nozzle (3) includes two nozzles (31), and the first nozzle (311) of the two nozzles is the same three-way pipe.

6. The internal fire extinguishing device for switchgear according to claim 2, characterized in that: The slide (4) is fixedly installed on the inner side wall (51) of the switch cabinet. A horizontal slide groove (41) is provided in the slide (4). A sliding block (42) is provided in the horizontal slide groove (41). The stop door (1) is rotatably connected to the sliding block (42).

7. The internal fire extinguishing device for switchgear according to claim 6, characterized in that: One end of the gate (1) is slidably mounted on two slides (4). When the gate (1) is in the maintenance position, the fire extinguishing agent tank (2) is located in the cavity formed by the two slides (4), the baffle and the inner wall (51) of the switch cabinet.

8. The internal fire extinguishing device for switchgear according to claim 1, characterized in that: A vertical bending plate (11) is provided at the connection between the gate (1) and the slide (4) to make the gate (1) "L" shaped. The vertical bending plate (11) is used to limit the rotation angle of the gate (1).

9. A built-in fire extinguishing device for switchgear according to claim 6, characterized in that: An elastic member (43) is provided in the horizontal slide groove (41). The elastic member (43) provides a force to the sliding block (42) to slide towards the rear cabinet door (52). A limit unit (12) is provided on the door stop (1) to maintain the door stop (1) in the maintenance position and the working position.

10. A switch cabinet, characterized in that: The device includes an internal fire extinguishing device for a switch cabinet as described in any one of claims 1 to 9, and also includes a cabinet body (5). The internal fire extinguishing device for the switch cabinet is disposed on one side of the inner wall of the cabinet body (5) or symmetrically disposed on both inner walls of the cabinet body (5).

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