Switch cabinet pressure relief device capable of preventing electric arc from overflowing and switch cabinet

Abstract

The invention relates to the related technical field of switch cabinets, in particular to a switch cabinet pressure relief device capable of preventing arc overflow and a switch cabinet, and the switch cabinet pressure relief device comprises a plurality of pressure relief ports formed at the top of a cabinet body and an opening and closing structure slidably arranged corresponding to the pressure relief ports in the cabinet body; the cylindrical tank is fixedly installed in the cabinet body, a pressure monitoring assembly is arranged in the cylindrical tank, and the pressure monitoring assembly abuts against a trigger mechanism installed in the cabinet body; after the intensity of pressure in the cabinet body exceeds a preset value, elastic force stored by the trigger mechanism instantly bursts out and acts on the telescopic piece arranged in the cabinet body, and the telescopic piece is connected with the opening and closing structure so as to control the opening and closing structure to move relative to the cabinet body. And the arc extinguishing structure is driven and controlled to convey a large amount of cold air into the cabinet body, so that the air pressure in the cabinet body can be rapidly reduced, the electric arc can be effectively cooled, charged particles around the electric arc can be rapidly taken away, and the electric arc is extinguished.

Description

Technical Field

[0001] This invention relates to the technical field of switchgear, specifically to a pressure relief device for switchgear to prevent arc leakage and a switchgear itself. Background Technology

[0002] A switchgear is an electrical device primarily used in power systems for power generation, transmission, distribution, and energy conversion. Its main functions include switching, controlling, and protecting electrical equipment. The switchgear design ensures that external lines first enter the main control switch inside the cabinet, then proceed to the branch control switches. Each branch circuit is configured according to its needs, including instruments, automatic controls, motor magnetic switches, and various AC contactors.

[0003] During operation, switchgear may experience primary circuit short circuits due to various reasons (such as short circuits, insulation aging, and human error). One such fault is an internal arcing fault, which is essentially an explosion. A massive arc of energy is concentrated within a confined space, and the resulting shockwave radiates in all directions at the speed of light. Upon reaching a blocking point, it creates negative pressure, causing a sudden increase in pressure and resulting in devastating damage. The energy needs to be released to reduce the damage; weaker points will be the first to break through, and the pressure will rapidly decrease. This is why metal-enclosed switchgear requires pressure relief covers. If high-temperature, high-pressure gas cannot be effectively released within a confined space in a very short time, it can cause the switchgear to rupture, damaging adjacent switchgear and potentially endangering personnel. Therefore, effective pressure relief measures must be considered during the design of switchgear.

[0004] Existing switchgear pressure relief devices are usually installed on the top or top of the switchgear to meet the requirements of being able to withstand normal pressure changes without leakage and to release pressure when it is too high. However, once the pressure relief channel is opened, the electric arc inside the switchgear can move out of the cabinet through the pressure relief channel in the pressure relief device, thereby damaging surrounding equipment and causing injury to operators. Summary of the Invention

[0005] The purpose of this invention is to provide a switchgear pressure relief device to prevent electric arc overflow, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A pressure relief device for a switch cabinet to prevent electric arc overflow includes multiple pressure relief ports formed on the top of the cabinet and an opening and closing structure that is slidably arranged inside the cabinet corresponding to the pressure relief ports; It also includes a cylindrical tank fixedly installed inside the cabinet. A pressure monitoring component is provided inside the cylindrical tank. The pressure monitoring component abuts against a triggering mechanism installed inside the cabinet. When the pressure inside the cabinet increases, it squeezes the pressure monitoring component to move. When the pressure inside the cabinet exceeds a preset value, the elastic force stored in the triggering mechanism bursts out instantly and acts on the telescopic component installed inside the cabinet. The telescopic component is connected to the opening and closing structure to control the movement of the opening and closing structure relative to the cabinet. An arc-extinguishing structure is installed inside the cabinet and connected to the telescopic component.

[0007] As described above, the switchgear pressure relief device for preventing electric arc overflow includes a pressure monitoring component comprising a first piston slidably disposed within the cylindrical tank, one end of the first piston being provided with an axially arranged extrusion shaft, and the end of the extrusion shaft away from the first piston penetrating the cylindrical tank. It also includes a first spring sleeved on the extrusion shaft, one end of the first spring abutting against the first piston, and the other end abutting against the top of the inner side of the cylindrical can.

[0008] As described above, the switchgear pressure relief device for preventing electric arc overflow has a first push rod and a second push rod fixedly installed on the extrusion shaft, with the first push rod and the second push rod arranged in parallel.

[0009] As described above, the switch cabinet pressure relief device for preventing electric arc overflow includes a triggering mechanism comprising a support plate fixedly installed inside the cabinet, a hinge plate rotatably connected to one end of the support plate away from the inside of the cabinet, and an extension rod perpendicular to the first push rod provided on the side end of the hinge plate. It also includes a second spring symmetrically arranged on both sides of the receiving plate, one end of the second spring being rotatably connected to the receiving plate and the other end being rotatably connected to the hinge plate.

[0010] As described above, the switchgear pressure relief device for preventing electric arc overflow has the following features: the receiving plate is symmetrically provided with limit plates along the rotation direction of the hinge plate.

[0011] As described above, the switch cabinet pressure relief device for preventing electric arc overflow includes a sliding plate that is slidably installed on the top of the cabinet interior, and the sliding plate is provided with a plurality of sealing blocks that are adapted to the pressure relief port.

[0012] As described above, the switch cabinet pressure relief device for preventing electric arc overflow includes a connecting sleeve, which is rotatably installed inside the cabinet via a support plate. A connecting shaft is slidably provided at the end of the connecting sleeve away from the support plate. A connecting rod is rotatably connected to the connecting shaft, and the end of the connecting rod away from the connecting shaft is rotatably connected to the sliding plate. It also includes a third spring, which is disposed inside the connecting sleeve. One end of the third spring abuts against the connecting shaft, and the other end abuts against the top of the inner side of the connecting sleeve.

[0013] The switchgear pressure relief device for preventing electric arc overflow as described above: the arc extinguishing structure includes a gas storage tank fixedly installed inside the cabinet, and a nozzle connected to the gas storage tank and communicating with the inner side; it also includes a pressing member disposed inside the gas storage tank and connected to the connecting sleeve.

[0014] As described above, the switchgear pressure relief device for preventing electric arc overflow includes a screw rod rotatably mounted on the support plate. The screw rod is rotatably connected to the connecting sleeve via a belt. A threaded sleeve is threadedly connected to the screw rod. The end of the threaded sleeve away from the screw rod is fixedly connected to a second piston that is slidably and sealed inside the gas storage tank.

[0015] A switch cabinet includes the switch cabinet pressure relief device for preventing arc leakage as described in any one of the above claims.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by using the pressure difference between the inside and outside of the cabinet, the pressure monitoring component is squeezed to move relative to the cylindrical tank, thereby driving the triggering mechanism to move synchronously. Once an electric arc fault occurs in the cabinet, generating high temperature and high pressure, and the pressure inside the cabinet is greater than the preset value, the elastic potential energy stored in the triggering mechanism itself bursts out instantly and separates from the pressure monitoring component, acting on the telescopic component. This causes the telescopic component to drive the opening and closing structure to contact and seal the pressure relief port when it expands and contracts relative to the telescopic component. At the same time, the arc extinguishing structure is controlled to deliver a large amount of cold air into the cabinet, so that the air pressure inside the cabinet can be reduced rapidly, while effectively cooling the electric arc and quickly removing the charged particles around the electric arc, thus extinguishing the electric arc. Attached Figure Description

[0017] Figure 1 A schematic diagram of the pressure relief device for the switchgear to prevent electric arc leakage.

[0018] Figure 2 A schematic diagram of the internal structure of the pressure relief device in the switchgear to prevent electric arc leakage.

[0019] Figure 3 A schematic diagram of the cylindrical tank and conduit in the pressure relief device of the switchgear to prevent electric arc leakage.

[0020] Figure 4 A schematic diagram of the cylindrical tank and pressure monitoring components in the pressure relief device of the switchgear to prevent electric arc leakage.

[0021] Figure 5 A schematic diagram of the pressure monitoring components and triggering mechanism in a switchgear pressure relief device to prevent electric arc leakage.

[0022] Figure 6A schematic diagram of the triggering mechanism, telescopic components, and opening / closing structure in a switchgear pressure relief device to prevent electric arc leakage.

[0023] Figure 7 A schematic diagram of the expansion joint and arc-extinguishing structure in the pressure relief device of the switchgear to prevent electric arc leakage.

[0024] Figure 8 A schematic diagram of the extrusion and expansion components in the pressure relief device of the switchgear to prevent electric arc leakage.

[0025] Figure 9 A schematic diagram of the connecting shaft and connecting sleeve in a switchgear pressure relief device to prevent electric arc leakage.

[0026] In the diagram: 1. Cabinet; 101. Pressure relief port; 2. Cylindrical tank; 201. Limiting end; 3. Conduit; 4. Extrusion shaft; 401. First push rod; 402. Second push rod; 5. First piston; 6. First spring; 7. Support plate; 701. Limiting plate; 8. Hinge plate; 9. Second spring; 10. Extension rod; 11. Slide plate; 1101. Sealing block; 12. Gas storage tank; 1201. Strip groove; 13. Nozzle; 14. Support plate; 15. Connecting shaft; 1501. Ball bearing; 16. Connecting sleeve; 1601. Limiting groove; 17. Third spring; 18. Belt; 19. Lead screw; 20. Threaded sleeve; 21. Second piston; 2101. Strip block; 22. Connecting rod. Detailed Implementation

[0027] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0028] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0029] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0030] Please see Figures 1-9 In this embodiment of the invention, a switch cabinet pressure relief device for preventing electric arc overflow includes a plurality of pressure relief ports 101 formed on the top of the cabinet body 1 and an opening and closing structure that is slidably arranged inside the cabinet body 1 corresponding to the pressure relief ports 101. It also includes a cylindrical tank 2 fixedly installed inside the cabinet 1. A pressure monitoring component is provided inside the cylindrical tank 2. The pressure monitoring component abuts against a triggering mechanism installed inside the cabinet 1. When the pressure inside the cabinet 1 increases, it squeezes the pressure monitoring component to move. After the pressure inside the cabinet 1 exceeds a preset value, the elastic force stored in the triggering mechanism bursts out instantly and acts on the telescopic component installed inside the cabinet 1. The telescopic component is connected to the opening and closing structure to control the movement of the opening and closing structure relative to the cabinet 1. An arc-extinguishing structure is installed inside the cabinet 1 and connected to the telescopic component.

[0031] The cylindrical tank 2 is connected to the outside world through the conduit 3, so that the pressure inside the cylindrical tank 2 is atmospheric.

[0032] In detail, to address the issue of arcing faults within cabinet 1 leading to arc overflow and severe damage to the power distribution system within cabinet 1, this embodiment employs the arc overflow prevention switchgear pressure relief device described in this invention. During operation, when the pressure inside cabinet 1 increases, the pressure difference between the inside and outside of cabinet 1 causes the pressure monitoring component to move relative to the cylindrical tank 2, thereby driving the triggering mechanism to move synchronously. Once an arc fault occurs within cabinet 1, generating high temperature and pressure, and the pressure inside cabinet 1 exceeds a preset value (to prevent explosion, cabinet 1 must be rapidly depressurized when the pressure exceeds this preset value), the elastic potential energy stored in the triggering mechanism is instantly released and separates from the pressure monitoring component, acting on the telescopic component. This causes the telescopic component to extend and retract relative to the opening and closing structure, sealing the pressure relief port 101. Simultaneously, the arc extinguishing structure delivers a large amount of cold air into cabinet 1, rapidly reducing the air pressure within cabinet 1 while effectively cooling the arc and quickly removing charged particles around it, thus extinguishing the arc.

[0033] Please see Figure 4 The pressure monitoring assembly includes a first piston 5 that is slidably disposed inside the cylindrical tank 2. One end of the first piston 5 is provided with a compression shaft 4 along the axial direction, and the end of the compression shaft 4 away from the first piston 5 passes through the cylindrical tank 2. It also includes a first spring 6 sleeved on the extrusion shaft 4, one end of the first spring 6 abutting against the first piston 5, and the other end abutting against the top of the inner side of the cylindrical tank 2.

[0034] Preferably, the cylindrical tank 2 has a limiting end 201 for limiting the pressure monitoring component.

[0035] In detail, initially, the first spring 6 is in a compressed state, mainly to prevent the air pressure changes generated during normal operation of the power distribution equipment in the cabinet 1 from affecting the movement of the first piston 5. When the air pressure in the cabinet 1 is greater than the air pressure range caused by normal operation, the air pressure difference between the cabinet 1 and the cylindrical tank 2 is greater than the elastic potential energy stored in the first spring 6, which compresses the first piston 5, causing the first piston 5 to slide relative to the inner wall of the cylindrical tank 2 and drive the extrusion shaft 4 to move synchronously. When the first piston 5 moves, it compresses the first spring 6, causing the first spring 6 to be compressed again to store elastic potential energy. At this time, the first push rod 401 on the extrusion shaft 4 is in a contact state with the triggering mechanism. Under the action of the first push rod 401, the movement of the triggering mechanism is achieved.

[0036] Preferably, a first push rod 401 and a second push rod 402 are fixedly disposed on the extrusion shaft 4, and the first push rod 401 and the second push rod 402 are arranged in parallel.

[0037] Please see Figure 5 The triggering mechanism includes a support plate 7 fixedly installed inside the cabinet 1. A hinge plate 8 is rotatably connected to one end of the support plate 7 away from the inside of the cabinet 1. An extension rod 10 perpendicular to the first push rod 401 is provided on the side end of the hinge plate 8. It also includes a second spring 9 symmetrically arranged on both sides of the receiving plate 7, one end of the second spring 9 being rotatably connected to the receiving plate 7 and the other end being rotatably connected to the hinge plate 8.

[0038] The receiving plate 7 is symmetrically provided with a limiting plate 701 along the rotation direction of the hinge plate 8.

[0039] Initially, the second spring 9 is in a stretched state, with its stretch at its minimum. The second spring 9 exerts a force on the hinge plate 8, causing it to rotate towards the receiving plate 7. However, the angle of inclination of the hinge plate 8 is limited by the limiting plate 701. When the first push rod 401 moves, it is in contact with the extension rod 10. The movement of the first push rod 401 pushes the extension rod 10 to move synchronously, causing the hinge plate 8 to rotate relative to the receiving plate 7. The second spring 9 is stretched. As the air pressure inside the cabinet 1 gradually increases, the pressing shaft 4 drives the first push rod 401 to move continuously until the hinge plate 8 rotates. When the hinge plate 8 is parallel to the support plate 7, the tension of the second spring 9 is at its maximum. Under the elastic action of the second spring 9, the hinge plate 8 and the support plate 7 are in a state of force balance. At this time, the air pressure inside the cabinet 1 is close to the preset value. When the air pressure inside the cabinet 1 reaches the preset value, the first spring 6 is in a fully compressed state. At this time, the hinge plate 8 continues to rotate. Once the hinge plate 8 and the support plate 7 are no longer parallel, the second spring 9 will generate a force on the hinge plate 8 to rotate towards the support plate 7 under its own reserve elasticity. This causes the hinge plate 8 to rotate instantaneously and squeeze the telescopic component to meet the sliding requirement of the telescopic component driving the opening and closing structure.

[0040] Simultaneously, under the restriction of the limiting plate 701, the hinge plate 8 has a limited rotation angle and is in contact with the second push rod 402. When the air pressure inside the cabinet 1 decreases, the second push rod 402 can push the hinge plate 8 to reset under the action of the first spring 6. When it resets to be parallel with the support plate 7 again, the second push rod 402 is about to disengage from the hinge plate 8. When the hinge plate 8 rotates to the point where it is no longer parallel with the support plate 7, the hinge plate 8 quickly disengages from the second push rod 402 under the action of the second spring 9. After the hinge plate 8 is fully reset, it is in contact with the first push rod 401. This ensures that when the air pressure inside the cabinet 1 changes beyond the normal air pressure range, the first push rod 401 and the second push rod 402 can quickly drive the hinge plate 8 to rotate.

[0041] Among them, the second spring 9 is always in a stretched state.

[0042] Please see Figure 6 The opening and closing structure includes a sliding plate 11 that is slidably installed on the top of the inner side of the cabinet 1, and the sliding plate 11 is provided with a plurality of sealing blocks 1101 that are adapted to the pressure relief port 101.

[0043] The telescopic component includes a connecting sleeve 16, which is rotatably mounted on the inner side of the cabinet 1 via a support plate 14. A connecting shaft 15 is slidably disposed at the end of the connecting sleeve 16 away from the support plate 14. A connecting rod 22 is rotatably connected to the connecting shaft 15, and the end of the connecting rod 22 away from the connecting shaft 15 is rotatably connected to the slide plate 11. It also includes a third spring 17, which is disposed inside the connecting sleeve 16. One end of the third spring 17 abuts against the connecting shaft 15, and the other end abuts against the top of the inner side of the connecting sleeve 16.

[0044] Preferably, a ball bearing 1501 is movably disposed on the connecting shaft 15, and a limiting groove 1601 is formed on the inner wall of the connecting sleeve 16 to slide with the ball bearing 1501. The limiting groove 1601 is configured as a threaded groove. When the connecting shaft 15 moves relative to the connecting sleeve 16, it drives the ball bearing 1501 to move synchronously. The ball bearing 1501 squeezes the limiting groove 1601. The movement trajectory of the ball bearing 1501 is always in a straight line, so that the connecting sleeve 16 rotates to ensure that the ball bearing 1501 always moves within the limiting groove 1601, thereby meeting the requirement that the connecting sleeve 16 rotates when the connecting shaft 15 moves relative to the connecting sleeve 16.

[0045] Furthermore, when the hinge plate 8 bursts out instantaneously, it squeezes the connecting shaft 15, causing the connecting shaft 15 to move relative to the connecting sleeve 16. Under the cooperation of the ball bearing 1501 and the limiting groove 1601, the connecting sleeve 16 rotates. The rotation of the connecting sleeve 16 does not affect the connecting shaft 15. When the connecting shaft 15 moves, the sliding plate 11 moves synchronously under the action of the connecting rod 22. When the sliding plate 11 moves, the sealing block 1101 on it releases the sealing state of the pressure relief port 101, so that the air pressure inside the cabinet 1 can be discharged to the outside through the pressure relief port 101, so that the air pressure inside the cabinet 1 can be quickly dissipated, thereby preventing the cabinet 1 from exploding due to excessive air pressure.

[0046] It should be noted that the distance between two adjacent pressure relief ports 101 should not exceed the width of the sealing block 1101. This is mainly to avoid the situation where the sealing block 1101 overlaps with the adjacent pressure relief port 101 when the distance the sealing block 1101 moves is equal to the width of the sealing block 1101 itself, which would prevent the pressure relief port 101 from being completely unblocked.

[0047] Please see Figure 7 and Figure 8 The arc extinguishing structure includes an air tank 12 fixedly installed inside the cabinet 1, and a nozzle 13 connected to the air tank 12 and communicating with the inner side; it also includes a pressing member disposed inside the air tank 12 and connected to the connecting sleeve 16.

[0048] The extrusion component includes a lead screw 19 rotatably mounted on the support plate 14. The lead screw 19 is rotatably connected to the connecting sleeve 16 via a belt 18. A threaded sleeve 20 is threadedly connected to the lead screw 19. One end of the threaded sleeve 20 away from the lead screw 19 is fixedly connected to a second piston 21 that is slidably and sealed within the gas storage tank 12.

[0049] Preferably, the first piston 5 and the second piston 21 are made of rubber, which can adapt to different working conditions and pressure changes and maintain sealing performance.

[0050] The gas storage tank 12 is equipped with an air outlet and an air inlet, and a first one-way valve and a second one-way valve are respectively installed in the air outlet and the air inlet. A nozzle 13 is connected to the air outlet. When the second piston 21 moves down, it compresses the gas in the gas storage tank 12, so that a large amount of cold air is delivered to the nozzle 13 through the first one-way valve on the air outlet. At this time, the second one-way valve on the air inlet is not affected. When the second piston 21 moves up, the prepared cold air can be delivered into the gas storage tank 12 through the second one-way valve on the air inlet, preparing for the next arc extinguishing operation.

[0051] Preferably, the gas storage tank 12 is provided with at least one set of strip grooves 1201, and the second piston 21 is formed with a strip block 2101 that slides in cooperation with the strip grooves 1201.

[0052] When the connecting sleeve 16 rotates, the belt 18 drives the lead screw 19 to rotate synchronously. When the lead screw 19 rotates, it drives the threaded sleeve 20 to move linearly along the axial direction of the lead screw 19. When the threaded sleeve 20 moves, it can drive the second piston 21 to move synchronously. Under the cooperation of the strip groove 1201 and the strip block 2101, the second piston 21 can only slide relative to the inner wall of the gas storage tank 12, and the rotation of the lead screw 19 does not affect the threaded sleeve 20. When the second piston 21 moves down, it can transport the gas stored in the gas storage tank 12 to the nozzle 13. Under the action of the nozzle 13, a large amount of cold air is blown into the space around the electric arc, effectively cooling the electric arc and quickly carrying away the charged particles around the electric arc, so that the electric arc is extinguished.

[0053] It should also be noted that the instantaneous force of the hinge plate 8 causes the distance the connecting shaft 15 moves to be insufficient to support the rotational speed of the lead screw 19. Therefore, the pitch setting of the threaded groove on the limiting groove 1601 can change the rotational speed of the connecting sleeve 16. The connecting sleeve 16 and the lead screw 19 are respectively fitted with pulleys. By using two pulleys of different sizes, the transmission ratio between the connecting sleeve 16 and the lead screw 19 is changed, so that the rotational speed of the lead screw 19 is greater than that of the connecting sleeve 16, so as to meet the requirement of the second piston 21 to quickly compress the cold air in the air tank 12.

[0054] When the cabinet 1 is working normally, the internal power distribution system will generate heat. However, the air tank 12 is made of a special material so that the temperature of the air inside the air tank 12 will not be affected when the temperature inside the cabinet 1 changes.

[0055] A switch cabinet includes the switch cabinet pressure relief device for preventing arc leakage as described in any one of the above claims.

[0056] 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 in all respects as exemplary and non-limiting, 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.

[0057] 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 pressure relief device for a switchgear to prevent electric arc overflow, comprising a plurality of pressure relief ports (101) formed on the top of the cabinet (1) and an opening and closing structure slidably disposed inside the cabinet (1) corresponding to the pressure relief ports (101), characterized in that ； It also includes a cylindrical tank (2) fixedly installed inside the cabinet (1). A pressure monitoring component is provided inside the cylindrical tank (2). The pressure monitoring component abuts against a triggering mechanism installed inside the cabinet (1). When the pressure inside the cabinet (1) increases, it squeezes the pressure monitoring component to move. After the pressure inside the cabinet (1) exceeds a preset value, the elastic force stored in the triggering mechanism bursts out instantly and acts on the telescopic component installed inside the cabinet (1). The telescopic component is connected to the opening and closing structure to control the opening and closing structure to move relative to the cabinet (1). An arc-extinguishing structure is installed inside the cabinet (1) and connected to the telescopic component.

2. The switchgear pressure relief device for preventing electric arc overflow according to claim 1, characterized in that, The pressure monitoring assembly includes a first piston (5) that is slidably disposed inside the cylindrical tank (2). One end of the first piston (5) is provided with a compression shaft (4) along the axial direction. The end of the compression shaft (4) away from the first piston (5) passes through the cylindrical tank (2). It also includes a first spring (6) sleeved on the extrusion shaft (4), one end of the first spring (6) abutting against the first piston (5), and the other end abutting against the top of the inner side of the cylindrical tank (2).

3. The switchgear pressure relief device for preventing electric arc overflow according to claim 2, characterized in that, The extrusion shaft (4) is fixedly provided with a first push rod (401) and a second push rod (402), which are arranged in parallel.

4. The switchgear pressure relief device for preventing electric arc overflow according to claim 3, characterized in that, The triggering mechanism includes a support plate (7) fixedly installed inside the cabinet (1), a hinge plate (8) rotatably connected to one end of the support plate (7) away from the inside of the cabinet (1), and an extension rod (10) perpendicular to the first push rod (401) is provided on the side end of the hinge plate (8); it also includes a second spring (9) symmetrically arranged on both sides of the support plate (7), one end of the second spring (9) rotatably connected to the support plate (7), and the other end rotatably connected to the hinge plate (8).

5. A switchgear pressure relief device for preventing electric arc overflow according to claim 4, characterized in that, The receiving plate (7) is symmetrically provided with a limiting plate (701) along the rotation direction of the hinge plate (8).

6. A switchgear pressure relief device for preventing electric arc overflow according to claim 1, characterized in that, The opening and closing structure includes a sliding plate (11) that is slidably installed on the top of the inner side of the cabinet (1), and the sliding plate (11) is provided with a plurality of sealing blocks (1101) that are adapted to the pressure relief port (101).

7. A switchgear pressure relief device for preventing electric arc overflow according to claim 6, characterized in that, The telescopic component includes a connecting sleeve (16), which is rotatably mounted on the inside of the cabinet (1) via a support plate (14). A connecting shaft (15) is slidably disposed at one end of the connecting sleeve (16) away from the support plate (14). A connecting rod (22) is rotatably connected to the connecting shaft (15), and one end of the connecting rod (22) away from the connecting shaft (15) is rotatably connected to the slide plate (11). It also includes a third spring (17), which is disposed inside the connecting sleeve (16). One end of the third spring (17) abuts against the connecting shaft (15), and the other end abuts against the top of the inner side of the connecting sleeve (16).

8. A switchgear pressure relief device for preventing electric arc overflow according to claim 7, characterized in that, The arc-extinguishing structure includes an air tank (12) fixedly installed inside the cabinet (1), and a nozzle (13) connected to the air tank (12) and communicating with the inner side; it also includes an extrusion member disposed inside the air tank (12) and connected to the connecting sleeve (16).

9. A switchgear pressure relief device for preventing electric arc overflow according to claim 8, characterized in that, The extrusion component includes a lead screw (19) rotatably mounted on the support plate (14), the lead screw (19) being rotatably connected to the connecting sleeve (16) via a belt (18), and a threaded sleeve (20) being threadedly connected to the lead screw (19). The end of the threaded sleeve (20) away from the lead screw (19) is fixedly connected to a second piston (21) that is sealed and slidably disposed in the gas storage tank (12).

10. A switch cabinet, characterized in that, The switchgear pressure relief device for preventing electric arc overflow as described in any one of claims 1-9.

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