Switchgear preventing explosion from hurting people

Abstract

The utility model relates to a switch cabinet technical field especially is concerned about a kind of switch cabinet to prevent explosion injury, including cabinet, the rear cabinet door inboard of cabinet is laid with explosion-proof board, the explosion-proof board is composed of reinforced fibre cement board and galvanized steel sheet, the galvanized steel sheet is attached to the side of reinforced fibre cement board close to the inside of cabinet, and explosion-proof board is fixedly connected with rear cabinet door by self-tapping screw.The utility model is laid with the explosion-proof board composed of reinforced fibre cement board and galvanized steel sheet in the rear cabinet door inboard, forms double protection structure.Reinforced fibre cement board has good compression resistance, impact resistance, can absorb part of energy generated by explosion;Galvanized steel sheet further blocks the penetration of explosion fragments and shock wave by virtue of high-strength characteristics.Avoid direct harm to the operator outside cabinet, greatly improve the safety of switch cabinet operation.

Description

Technical Field

[0001] This utility model relates to the field of switch cabinet technology, and in particular to a switch cabinet that prevents people from being injured by explosions. Background Technology

[0002] Switchgear is an integrated electrical device that mainly integrates circuit breakers, disconnect switches, grounding switches, and other equipment. It is widely used due to its advantages such as high integration, convenient operation, and small footprint. High-voltage switchgear refers to electrical equipment with a voltage level exceeding 1000 volts, with 10 kV and 35 kV being the most common voltage levels.

[0003] Structurally, a switchgear is a box-like structure containing various electrical equipment and wires. During normal operation, to prevent electric shock, the switchgear is in a locked state. The handcart circuit breaker in a conventional switchgear is a vacuum circuit breaker, which relies on the arc-extinguishing chamber under vacuum conditions to complete the switching operation and the arc-extinguishing work in case of fault. Due to the reduced vacuum degree of the arc-extinguishing chamber, the old handcart circuit breaker has a reduced ability to extinguish high-voltage arcs. The continuous arc will generate extremely high heat, causing the surrounding medium (such as air, insulating oil, solid insulating materials) to heat up and expand rapidly. This causes the pressure in the enclosed space to rise sharply in a short period of time. As a result, during fault tripping or normal switching operation, the high-voltage arc may not be extinguished, which may cause the circuit breaker to explode, seriously endangering the personal safety of the operators. Utility Model Content

[0004] The purpose of this utility model is to provide a switch cabinet that prevents injuries from explosions, thereby solving the above-mentioned technical problems.

[0005] This utility model provides a switch cabinet to prevent explosion injuries, including a cabinet body. An explosion-proof plate is laid on the inner side of the rear door of the cabinet body. The explosion-proof plate is composed of reinforced fiber cement board and galvanized steel plate. The galvanized steel plate is attached to the side of the reinforced fiber cement board near the inside of the cabinet body, and the explosion-proof plate is fixedly connected to the rear door by self-tapping screws.

[0006] Furthermore, the thickness of the reinforced fiber cement board is 3-8mm, and the thickness of the galvanized steel plate is 1-3mm.

[0007] Furthermore, the inner wall of the cabinet is provided with multiple hooks, on which fire extinguishing balls are suspended.

[0008] Furthermore, the fire extinguishing ball includes a shell and a fire extinguishing agent encapsulated within the shell, the shell being made of a heat-sensitive material.

[0009] Furthermore, the fire extinguishing balls are distributed inside the cabinet above, to the left and to the right of the corresponding handcart circuit breaker.

[0010] Furthermore, the extinguishing agent is at least one of dry powder extinguishing agent, carbon dioxide, or heptafluoropropane.

[0011] Furthermore, the rear door edge of the cabinet is provided with a sealing strip, which is made of high-temperature resistant silicone rubber material. When the rear door is closed, the sealing strip is tightly fitted to the cabinet frame.

[0012] Furthermore, the cabinet is equipped with a temperature sensor and an arc sensor. The temperature sensor is used to detect the temperature inside the cabinet, and the arc sensor is used to detect whether an arc is generated inside the cabinet. Both the temperature sensor and the arc sensor are electrically connected to an alarm device via a controller. The alarm device is located on the outer wall of the cabinet.

[0013] Furthermore, the alarm device includes a buzzer and a warning light. When the temperature detected by the temperature sensor exceeds a preset threshold or the arc sensor detects an abnormal arc, the buzzer emits an audible alarm and the warning light emits a visual alarm.

[0014] Furthermore, the cabinet is also equipped with a pressure sensor, and the top of the cabinet is equipped with a pressure relief channel. The pressure relief channel is connected to a vacuum tank, and the vacuum tank is connected to a vacuum pump through a pipe. Solenoid valves are installed on the pressure relief channel and the pipe between the vacuum tank and the vacuum pump. The output end of the pressure sensor is electrically connected to the controller, and the output end of the controller is electrically connected to the solenoid valve and the vacuum pump.

[0015] Beneficial effects:

[0016] This invention creates a double-protection structure by laying an explosion-proof plate composed of reinforced fiber cement board and galvanized steel plate on the inside of the rear cabinet door. The reinforced fiber cement board has excellent compressive and impact resistance, absorbing some of the energy generated by an explosion; the galvanized steel plate, with its high strength, further blocks the penetration of explosion fragments and shock waves. The combination of the two significantly improves the explosion-proof capability of the rear cabinet door. In the event of an explosion caused by arc-extinguishing chamber problems in an old handcart circuit breaker, it effectively blocks the fragments and impact force generated by the explosion, avoiding direct injury to operators outside the cabinet and greatly improving the safety of switchgear operation. Simultaneously, the explosion-proof plate is fixedly connected to the rear cabinet door with self-tapping screws, a simple and reliable fixing method that facilitates installation and maintenance without causing excessive alteration to the original overall structure of the switchgear. It is suitable for the renovation and upgrading of various conventional high-voltage switchgear. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a side view of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the explosion-proof plate installation in this utility model;

[0020] Figure 3 This is a schematic diagram showing the connection relationship of some components in this utility model;

[0021] Figure 4 This is a schematic diagram showing the distribution of the vacuum tank and cabinet in this utility model.

[0022] Explanation of reference numerals in the attached diagram: 1-cabinet, 2-explosion-proof plate, 3-self-tapping screw, 4-hook, 5-temperature sensor, 6-arc sensor, 701-buzzer, 702-warning light, 8-pressure sensor, 9-pressure relief channel, 10-vacuum tank, 11-air pump, 12-solenoid valve, 13-controller. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1

[0027] A switch cabinet designed to prevent explosions and injuries, such as Figure 1-3 As shown, the cabinet includes a cabinet body 1. An explosion-proof plate 2 is installed on the inner side of the rear door of cabinet body 1. The explosion-proof plate is composed of reinforced fiber cement board and galvanized steel plate. The galvanized steel plate is attached to the side of the reinforced fiber cement board closest to the interior of the cabinet, and the explosion-proof plate is fixedly connected to the rear door by self-tapping screws 3. Specifically, the rear door of the cabinet body, as a critical part facing the impact of an explosion, is specially equipped with an explosion-proof plate on its inner side. This explosion-proof plate adopts a composite structure design, composed of reinforced fiber cement board and galvanized steel plate. The reinforced fiber cement board has excellent compressive and impact resistance, effectively absorbing part of the impact force generated by an explosion, while the galvanized steel plate, with its high strength characteristics, further enhances the overall structural strength of the explosion-proof plate. The galvanized steel plate is specifically attached to the side of the reinforced fiber cement board closest to the interior of the cabinet, forming double protection from both inside and outside. To ensure a stable connection between the explosion-proof plate and the rear door, the two are fixedly connected by self-tapping screws. This connection method is not only convenient to install but also ensures that it is not easily detached in the event of an impact, providing a reliable explosion-proof barrier for the rear door. Explosion-proof panels are installed on the rear doors of switchgear cabinets because they face the highest risk of explosion (fault energy is easily released backwards, and personnel movement is frequent). Explosion-proof panels can specifically block energy and reduce injury. Other cabinet doors, due to their functional requirements (ease of operation, observation needs) and lower risks, usually do not require explosion-proof panels.

[0028] Furthermore, the thickness of the reinforced fiber cement board is 3-8mm, and the thickness of the galvanized steel sheet is 1-3mm. This thickness range meets the basic structural support and impact absorption requirements without excessively increasing the weight of the rear cabinet door; the thickness of the galvanized steel sheet is 1-3mm, which, by matching the thickness of the reinforced fiber cement board, achieves a balance between protective performance and economy.

[0029] The inner wall of the cabinet is equipped with multiple hooks 4, on which fire extinguishing balls are suspended. Each fire extinguishing ball consists of a shell and a fire extinguishing agent (dry powder) encapsulated within. The shell is made of a heat-sensitive material; when the ambient temperature reaches a certain threshold, the shell rapidly ruptures, releasing the internal fire extinguishing agent to extinguish the fire source promptly and effectively curb its spread. Alternatively, the fire extinguishing ball may have a heat-sensitive wire; when the ambient temperature rises to a certain level, the wire ignites, igniting the gas-generating agent and causing the fire extinguishing ball shell to burst, releasing the fire extinguishing agent. The presence of fire extinguishing balls allows for a rapid response in the event of a fire, buying valuable time to prevent its spread and serving as a crucial active fire prevention measure within the cabinet. The fire extinguishing balls are distributed inside the cabinet above, to the left, and to the right of the corresponding circuit breaker. The circuit breaker is a core component of the high-voltage switchgear; a fault in it can easily ignite a fire. Placing fire extinguishing balls around it allows for rapid action on the fault point as soon as a fire occurs, minimizing the damage caused by the fire.

[0030] The rear door edge of the cabinet is equipped with a sealing strip made of high-temperature resistant silicone rubber. When the rear door is closed, the sealing strip fits tightly against the cabinet frame.

[0031] The cabinet is equipped with a temperature sensor 5 and an arc sensor 6. The temperature sensor detects the internal temperature of the cabinet, and the arc sensor detects whether an electric arc has occurred inside the cabinet. Both temperature sensor 5 and arc sensor 6 are electrically connected to an alarm device via controller 13, which is located on the outer wall of the cabinet. The alarm device includes a buzzer 701 and a warning light 702. When the temperature detected by the temperature sensor exceeds a preset threshold or the arc sensor detects an abnormal arc, the buzzer sounds an audible alarm, and the warning light emits a visual alarm. When the temperature detected by the temperature sensor exceeds the preset threshold, or the arc sensor detects an arc, the controller immediately triggers the alarm device. At this time, the buzzer emits a loud audible alarm, which can quickly attract the attention of surrounding personnel; the warning light emits a conspicuous visual alarm, which can clearly transmit the alarm signal even in noisy environments, thereby reminding staff to take timely countermeasures.

[0032] Example 2

[0033] The basic structure is the same as in Example 1, such as... Figure 4As shown, the difference lies in the following: a pressure sensor 8 is also installed inside the cabinet, and a pressure relief channel 9 is located at the top of the cabinet. The pressure relief channel 9 is connected to a vacuum tank 10, and the negative pressure value of the vacuum tank is designed according to its capacity. The vacuum tank is connected to a vacuum pump 11 via a pipe. Solenoid valves 12 are installed on both the pressure relief channel 9 and the pipes between the vacuum tank 10 and the vacuum pump 11. The output of the pressure sensor 8 is electrically connected to a controller 13, and the output of the controller 13 is electrically connected to the solenoid valves 12 and the vacuum pump 11. When high pressure occurs inside the cabinet for some reason, the pressure sensor will quickly capture this abnormal signal and transmit it to the controller. Upon receiving the signal, the controller will immediately instruct the solenoid valves on the pressure relief channel and the pipes between the vacuum tank and the vacuum pump to open. Because the vacuum tank is under vacuum, the high-pressure gas inside the cabinet rushes into the vacuum tank through the pressure relief channel the instant the solenoid valve opens, due to the huge pressure difference. This instantly releases the high-pressure gas inside the cabinet, effectively preventing potential safety hazards or equipment damage caused by excessive internal pressure due to delayed vacuum pump startup. After the instantaneous pressure relief is complete, the vacuum pump is ready to start. At this point, the vacuum pump begins to work, extracting the temporarily stored high-pressure gas from the vacuum tank and discharging it to the outside of the cabinet through the pipeline.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A switch cabinet designed to prevent injury from explosions, characterized in that, The cabinet includes a cabinet body, and the inside of the rear door of the cabinet body is covered with an explosion-proof plate. The explosion-proof plate is composed of reinforced fiber cement board and galvanized steel plate. The galvanized steel plate is attached to the side of the reinforced fiber cement board near the inside of the cabinet body, and the explosion-proof plate is fixedly connected to the rear door by self-tapping screws.

2. The switchgear for preventing explosion-induced injuries according to claim 1, characterized in that, The thickness of the reinforced fiber cement board is 3-8mm, and the thickness of the galvanized steel sheet is 1-3mm.

3. The switchgear for preventing explosion-induced injuries according to claim 1, characterized in that, The cabinet has multiple hooks on its inner side wall, and fire extinguishing balls are suspended from the hooks.

4. The switch cabinet for preventing explosion-induced injuries according to claim 3, characterized in that, The fire extinguishing ball includes a shell and a fire extinguishing agent encapsulated within the shell, the shell being made of a heat-sensitive material.

5. The switchgear for preventing explosion-induced injuries according to claim 3, characterized in that, The fire extinguishing balls are distributed inside the cabinet above, to the left and to the right of the corresponding handcart circuit breaker.

6. The switch cabinet for preventing explosion-induced injuries according to claim 4, characterized in that, The extinguishing agent is at least one of dry powder extinguishing agent, carbon dioxide, or heptafluoropropane.

7. The switch cabinet for preventing explosion-induced injuries according to claim 1, characterized in that, The cabinet has a sealing strip on the edge of the rear door. The sealing strip is made of high-temperature resistant silicone rubber. When the rear door is closed, the sealing strip is tightly attached to the cabinet frame.

8. The switch cabinet for preventing explosion-induced injuries according to claim 1, characterized in that, The cabinet is equipped with a temperature sensor and an arc sensor. The temperature sensor is used to detect the temperature inside the cabinet, and the arc sensor is used to detect whether an arc is generated inside the cabinet. Both the temperature sensor and the arc sensor are electrically connected to an alarm device via a controller. The alarm device is located on the outer wall of the cabinet.

9. The switch cabinet for preventing explosion-induced injuries according to claim 8, characterized in that, The alarm device includes a buzzer and a warning light. When the temperature detected by the temperature sensor exceeds a preset threshold or the arc sensor detects an arc, the buzzer sounds an audible alarm and the warning light emits a visual alarm.

10. The switchgear for preventing explosion-induced injuries according to claim 9, characterized in that, The cabinet is also equipped with a pressure sensor. The top of the cabinet is equipped with a pressure relief channel, which is connected to a vacuum tank. The vacuum tank is connected to a vacuum pump via a pipe. Solenoid valves are installed on the pressure relief channel and the pipe between the vacuum tank and the vacuum pump. The output end of the pressure sensor is electrically connected to the controller. The output end of the controller is electrically connected to the solenoid valve and the vacuum pump.

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