A high-efficiency arc burning and pressure releasing device for switch cabinet

Abstract

This invention discloses a high-efficiency arc-induced pressure relief device for switchgear. Installed on the top side of the switchgear, it can receive high-pressure gas guided through a pressure relief channel. The device includes: a cylindrical body with a vertically arranged rectangular cross-section, its lower end connected to the top of the pressure relief channel; multiple sets of deformable energy-absorbing structural components arranged inside the cylindrical body, each with several vent holes; and a pressure relief cover plate connected to the upper end of the cylindrical body via a hinge. When an arc-induced failure occurs inside the switchgear, the generated arc and high-pressure gas enter the cylindrical body through the pressure relief channel, and after being buffered and depressurized through the vent holes on the multiple sets of deformable energy-absorbing structural components, the pressure relief cover plate is opened and discharged outwards. This invention has a simple structure and can effectively buffer and depressurize during the process of high-pressure gas rushing out of the switchgear, effectively preventing excessive pressure and the pressure relief cover plate from flying out directly, causing secondary damage to personnel and surrounding equipment.

Description

Technical Field

[0001] This invention relates to the field of switchgear and related air-insulated electrical equipment, specifically to a high-efficiency arc-relief device for switchgear. Background Technology

[0002] Currently, 10kV and 35kV switchgear and related air-insulated electrical equipment are all designed with pressure relief devices to prevent high-pressure gas from damaging personnel and surrounding equipment in the event of an internal arcing fault. Existing pressure relief devices mainly fall into the following two structural categories:

[0003] The first structure is relatively simple: a pressure relief plate is installed on the pressure relief channel. One end of the plate is fixed to the equipment body with a metal screw, and the other end is fixed with a plastic screw. When an arcing failure occurs, the high-pressure gas forcibly breaks through the plastic screw, thereby releasing the pressure. Although this structure can provide some pressure relief, the rupture threshold of the plastic screw is not easy to control precisely, and the pressure relief plate cannot effectively guide the airflow direction after opening, resulting in incomplete pressure release and low pressure relief efficiency. The protection effect for personnel and surrounding equipment is still not ideal.

[0004] The second structure is more complex: multiple U-shaped supports are installed on the pressure relief channel, and a tower-shaped structure is built using multiple bolts, rivets, and washers to form an arc-inducing cavity; then, inverted U-shaped supports are used to form an arc-generating cavity, and finally, a pressure relief cover plate completes the pressure release. Although this structure can achieve relatively sufficient pressure relief and avoid damage to personnel and surrounding equipment, its large number of parts and complex assembly make the installation process time-consuming and labor-intensive, and it is difficult to ensure process consistency, making it inconvenient for mass production and on-site maintenance.

[0005] Therefore, how to provide a pressure relief device that is simple in structure, highly efficient in pressure relief, easy to manufacture and install, and highly safe is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a high-efficiency arc-induced pressure relief device for switchgear, which can achieve multi-stage buffering of high-pressure gas in the pressure relief channel, effectively preventing excessive pressure and the pressure relief cover from flying out directly, causing secondary damage to personnel and surrounding equipment.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a high-efficiency arc-venting pressure relief device for switchgear, which is installed on the top side of the switchgear and can receive high-pressure gas guided through the pressure relief channel, comprising: The cylinder has a vertically arranged rectangular cross-section structure, and its lower end is connected to the top of the pressure relief channel; Multiple sets of deformable energy-absorbing structural components are arranged on the inner side of the cylinder, and each deformable energy-absorbing structural component is provided with several air vents. The pressure relief cover is connected to the upper end of the cylinder by a hinge. When an arcing fault occurs inside the switch cabinet, the generated arc and high-pressure gas enter the cylinder through the pressure relief channel, and after being buffered and depressurized through the vent holes on multiple sets of deformable energy-absorbing structural components, the pressure relief cover is opened and discharged outward.

[0008] The beneficial technical effects of this invention are as follows: This device is arranged on the gas exhaust path corresponding to the pressure relief channel of the switchgear, and uses the cylinder to form a directional pressure relief path, accelerating the gas guidance and discharge based on the chimney effect; it uses deformable energy-absorbing structural components to absorb part of the impact kinetic energy, reducing the pressure peak at the cover plate; the cover plate can be opened without damage, can be reused or automatically reset, avoiding the problem of secondary damage caused by broken plastic screws, thus improving reliability. At the same time, this device, based on multi-stage buffer pressure reduction, effectively prevents excessive pressure from causing the pressure relief cover plate to fly out directly and cause secondary damage to personnel and surrounding equipment.

[0009] Preferably, each deformable energy-absorbing structural component includes a vent plate and a deformable energy-absorbing plate. There are two sets of deformable energy-absorbing plates integrally formed on both sides of the vent plate. The deformable energy-absorbing plate and the vent plate form a trumpet-shaped structure. The deformable energy-absorbing plate is a corrugated bent plate. The vent plate has multiple rows of vent holes. Each deformable energy-absorbing structural component is detachably connected to the inner side of the cylinder through the deformable energy-absorbing plate.

[0010] The resulting technical effect is that the deformable energy-absorbing structure does not completely block the airflow. Instead, when the high-pressure airflow passes through, it absorbs energy by deforming the corrugated plate. At the same time, the trumpet-shaped configuration causes the high-pressure gas to first impact the permeable plate and then diffuse to the corrugated plates on both sides, extending the action path and increasing the buffering effect. The detachable connection facilitates installation and replacement, avoiding the overall scrapping.

[0011] Preferably, the multiple sets of deformable energy-absorbing structural components are arranged in multiple layers along the axial direction of the cylinder. The high-pressure gas entering the cylinder passes through each layer of deformable energy-absorbing structural components in sequence and is then buffered and depressurized step by step.

[0012] The resulting technical effects are: the multi-layer layout can gradually reduce gas pressure, avoiding excessive pressure on a single level; it extends the interaction time between the gas and the energy-absorbing structure, allowing for more efficient energy consumption; and the number of layers can be adjusted to accommodate different arc energy levels.

[0013] Preferably, the multiple sets of deformable energy-absorbing structural components can cover the cross-section of the cylinder.

[0014] The resulting technical effects are: ensuring that each part of the gas undergoes at least one buffering process to prevent crossflow from causing excessive local pressure; improving the overall pressure relief efficiency and safety of the device. In specific implementation, the device can be staggered vertically to reduce pressure step by step, avoiding excessive instantaneous impact pressure.

[0015] Preferably, each deformable energy-absorbing structural component is formed by stamping aluminum-zinc coated sheet.

[0016] The resulting technical advantages are: the material is corrosion-resistant, high-temperature resistant, and has moderate strength; the stamping process is suitable for mass production, has low cost, and provides good buffering and energy absorption.

[0017] Preferably, the inner sidewall of the cylinder is provided with a mounting plate corresponding to the axial direction, and the mounting plate is provided with multiple snap-fit ​​windows. The two ends of the multiple sets of deformable energy-absorbing structural members are mortised and tenoned and installed in the multiple snap-fit ​​windows.

[0018] The resulting technical advantage is that installation and disassembly do not require special tools, thus improving production and maintenance efficiency; To avoid the risk of failure caused by loose or corroded bolts; the snap-fit ​​window (with a concave-convex configuration to match the deformable energy-absorbing plate) is precisely positioned to ensure the alignment of the multi-layer structure.

[0019] Preferably, the pressure relief cover is a double-opening structure, including a left cover and a right cover. The left cover is connected to the left end of the cylinder by a hinge, and the right cover is connected to the right end of the cylinder by a hinge. The left cover and the right cover are joined in the middle and remain closed by gravity when not in operation. Under the action of high-pressure gas, they can open outwards simultaneously.

[0020] The resulting technical effects are: a small opening angle, which does not occupy too much external space and is suitable for occasions where the top space of the cabinet is limited; the hinge restrains the cover plate, preventing it from flying out and causing secondary damage; the left and right covers are symmetrically stressed, so the opening is smooth; and it can automatically gravity reset after pressure is released.

[0021] Preferably, both the left and right cover plates are provided with a number of vent holes.

[0022] The resulting technical effects are: achieving two-stage pressure relief: pre-venting through the small orifice reduces the peak pressure, and opening the main cover plate serves as the main pressure relief; reducing the pressure drop when the cover plate is opened, protecting the hinge structure; and when the arc energy is low, it is not even necessary to open the cover plate, as pressure can be relieved simply through the venting hole, extending the life of the cover plate.

[0023] Preferably, the bottom outer edge of the cylinder is provided with a perforated seat plate, which is bolted to the top side of the pressure relief channel of the switch cabinet.

[0024] The resulting technical effect is that the perforated seat plate can evenly distribute the bolt force, ensuring a tight fit between the cylinder and the top side of the pressure relief channel, preventing high-pressure gas from leaking from the connection, and facilitating disassembly and connection. Attached Figure Description

[0025] Figure 1 This invention relates to the overall structure of a high-efficiency arc-relief device for switchgear. Figure 1 ; Figure 2 This invention relates to the overall structure of a high-efficiency arc-relief device for switchgear. Figure 2 ; Figure 3 This is a side view of a high-efficiency arc-relief device for switchgear according to the present invention; Figure 4 This is a schematic diagram of the pressure relief cover plate being opened in a high-efficiency arc-relief device for switchgear according to the present invention; Figure 5 This is a schematic diagram of a deformable energy-absorbing structural component of a high-efficiency arc-relief pressure relief device for switchgear according to the present invention; Figure 6 This is a schematic diagram illustrating the application of the high-efficiency arc-relief pressure relief device for switchgear according to the present invention. Figure 1 ; Figure 7 This is a schematic diagram illustrating the application of the high-efficiency arc-relief pressure relief device for switchgear according to the present invention. Figure 2 .

[0026] 1. Cylinder body, 2. Deformable energy-absorbing structural component, 21. Ventilation plate, 211. Ventilation hole, 22. Deformable energy-absorbing plate, 3. Pressure relief cover plate, 31. Left cover plate, 32. Right cover plate, 33. Exhaust hole, 4. Hinge, 5. Mounting base plate, 51. Snap-fit ​​window, 6. Base plate with hole, 7. Switch cabinet. Detailed Implementation

[0027] 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.

[0028] See the appendix of this invention. Figures 1 to 7 According to an embodiment of the present invention, a high-efficiency arc-relief device for switchgear is installed on the top side of switchgear 7 and is capable of receiving high-pressure gas guided through the relief channel. It includes: Cylinder 1 has a vertically arranged rectangular cross-section structure, and its lower end is connected to the top of the pressure relief channel. The specific connection relationship is shown on the switch cabinet. Multiple sets of deformable energy-absorbing structural components are arranged on the inner side of the cylinder 1, and each deformable energy-absorbing structural component 2 is provided with several air vents. The pressure relief cover 3 is connected to the upper end of the cylinder 1 via a hinge 4. When an arcing fault occurs inside the switch cabinet 7, the generated arcing and high-pressure gas enter the cylinder 1 through the pressure relief channel. After passing through the vent holes 211 on multiple sets of deformable energy-absorbing structural components to complete the buffering and pressure relief, the pressure relief cover 3 is opened and discharged outward.

[0029] This invention can buffer and reduce pressure in multiple stages. When high-pressure gas passes through multiple sets of deformable energy-absorbing structural components, it can be buffered and reduced in pressure. Then, during the process of stamping the pressure relief cover, it can be reduced in pressure again, which can effectively prevent excessive pressure and the pressure relief cover from flying out directly, causing secondary damage to personnel and surrounding equipment.

[0030] In other embodiments, each deformable energy-absorbing structural component 2 includes a ventilated plate 21 and a deformable energy-absorbing plate 22. There are two sets of deformable energy-absorbing plates 22 integrally formed on both sides of the ventilated plate 21. The deformable energy-absorbing plate 22 and the ventilated plate 21 form a trumpet-shaped structure. The deformable energy-absorbing plate 22 is a corrugated bent plate. The ventilated plate 21 has multiple rows of vent holes 211. Each deformable energy-absorbing structural component 2 is detachably connected to the inner side of the cylinder 1 through the deformable energy-absorbing plate 22. The trumpet-shaped structure can extend the buffering time and better absorb impact energy.

[0031] In other specific embodiments, multiple sets of deformable energy-absorbing structural components are arranged in multiple layers along the axial direction of the cylinder. The high-pressure gas entering the cylinder 1 passes through each layer of deformable energy-absorbing structural components 2 in sequence and is then buffered and depressurized step by step.

[0032] In some other embodiments, multiple sets of deformable energy-absorbing structural members can cover the cross-section of the cylinder 1.

[0033] In some other specific embodiments, each deformable energy-absorbing structural component 2 is formed by stamping 1.5mm aluminum-zinc coated sheet or by mechanical bending, which is efficient, convenient, time-saving and labor-saving.

[0034] In other embodiments, the inner sidewall of the cylinder 1 is provided with a mounting plate 5 corresponding to the axial direction. The mounting plate 5 has multiple snap-fit ​​windows 51. The two ends of multiple sets of deformable energy-absorbing structural members are mortised and tenoned and installed in the multiple snap-fit ​​windows 51. The configuration of the snap-fit ​​windows matches the configuration of the deformable energy-absorbing plate.

[0035] In some other specific embodiments, the pressure relief cover 3 has a double opening structure, including a left cover 31 and a right cover 32. The left cover 31 is connected to the left end of the cylinder 1 by a hinge 4, and the right cover 32 is connected to the right end of the cylinder 1 by a hinge. The left cover 31 and the right cover 32 are joined in the middle and remain closed by gravity when not in operation. Under the action of high pressure gas, they can open outwards at the same time.

[0036] In some other embodiments, both the left cover plate 31 and the right cover plate 32 are provided with a number of vent holes 33. The vent holes can play a role in gradient pressure reduction, further avoiding secondary damage caused by excessive stamping of the cover plate.

[0037] In other embodiments, the bottom outer edge of the cylinder 1 is provided with a perforated seat plate 6, which is bolted to the top side of the pressure relief channel of the switch cabinet 7. Disassembly and connection are convenient.

[0038] The pressure relief channel inside the switch cabinet is pre-set. By installing a high-efficiency arc-induced pressure relief device above the pressure relief channel, the cavity of the (pressure relief channel) can be fully utilized to form a chimney effect, allowing the arc and high-pressure gas to quickly enter the pressure relief channel. When the equipment fails, the generated arc and high-pressure gas will be directed through the reserved channel.

[0039] In case of arcing or high-pressure gas, the pressure relief cover must be opened promptly. Failure to do so may result in the arcing and high pressure impacting other parts of the product. Furthermore, the existing plastic screws are not securely fastened, and the pressure relief cover could fly off, potentially causing secondary injury to personnel or other equipment.

[0040] A high-efficiency arc-venting pressure relief device is installed above the pressure relief channel of the power equipment, forming a cavity with the channel. This cavity creates a chimney effect, allowing the arc and high-pressure gas to quickly enter the pressure relief channel. When equipment malfunctions, the generated arc and high-pressure gas are directed through pre-reserved channels. The trumpet-shaped deformable energy-absorbing structure buffers energy; after buffering, the pressure of the arc and high-pressure gas is significantly reduced when the pressure relief cover is opened. The buffered arc and high-pressure gas then open the pressure relief cover, causing it to flip outwards. The pressure relief cover has a double-opening structure, with hinges on both sides and a smaller opening angle in the middle, effectively preventing excessive pressure from causing the cover to fly out and cause secondary damage to personnel and surrounding equipment.

[0041] The apparatus and methods disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the method section.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-efficiency arc-induced pressure relief device for switchgear, which is installed on the top side of the switchgear (7) and can receive high-pressure gas guided through the pressure relief channel, characterized in that, include: The cylinder (1) has a vertically arranged rectangular cross-section structure, and its lower end is connected to the top of the pressure relief channel; Multiple sets of deformable energy-absorbing structural components are arranged on the inner side of the cylinder (1), and each deformable energy-absorbing structural component (2) has several air vents. The pressure relief cover (3) is connected to the upper end of the cylinder (1) by a hinge (4). When an arc fault occurs inside the switch cabinet (7), the generated arc and high-pressure gas enter the cylinder (1) through the pressure relief channel, and after passing through the vent holes (211) on multiple sets of deformable energy-absorbing structural parts to complete the buffer pressure relief, the pressure relief cover (3) is opened and discharged outward.

2. The high-efficiency arc-relief device for switchgear according to claim 1, characterized in that, Each deformable energy-absorbing structural component (2) includes a ventilated plate (21) and a deformable energy-absorbing plate (22). The deformable energy-absorbing plate (22) has two sets and is integrally formed on both sides of the ventilated plate (21). The deformable energy-absorbing plate (22) and the ventilated plate (21) form a trumpet-shaped structure. The deformable energy-absorbing plate (22) is a wave-shaped bent plate. The ventilated plate (21) has multiple rows of vent holes (211). Each deformable energy-absorbing structural component (2) is detachably connected to the inner side of the cylinder (1) through the deformable energy-absorbing plate (22).

3. The high-efficiency arc-relief device for switchgear according to claim 1, characterized in that, The multiple sets of deformable energy-absorbing structural components are arranged in multiple layers along the axial direction of the cylinder. The high-pressure gas entering the cylinder (1) passes through each layer of deformable energy-absorbing structural components (2) in sequence and is then buffered and depressurized step by step.

4. The high-efficiency arc-relief device for switchgear according to claim 1, characterized in that, The multiple sets of deformable energy-absorbing structural components can cover the cross-section of the cylinder (1).

5. The high-efficiency arc-relief device for switchgear according to claim 1, characterized in that, Each deformable energy-absorbing structural component (2) is formed by stamping aluminum-zinc coated sheet.

6. The high-efficiency arc-relief device for switchgear according to claim 1, characterized in that, The inner sidewall of the cylinder (1) is provided with a mounting plate (5) corresponding to the axial direction. The mounting plate (5) is provided with multiple snap-fit ​​windows (51). The two ends of the multiple sets of deformable energy-absorbing structural members are mortised and tenoned and installed in the multiple snap-fit ​​windows (51).

7. The high-efficiency arc-relief device for switchgear according to claim 1, characterized in that, The pressure relief cover (3) is a double-opening structure, including a left cover (31) and a right cover (32). The left cover (31) is connected to the left end of the cylinder (1) by a hinge (4), and the right cover (32) is connected to the right end of the cylinder (1) by a hinge. The left cover (31) and the right cover (32) are joined in the middle and remain closed by gravity when not in operation. Under the action of high pressure gas, they can open outwards at the same time.

8. The high-efficiency arc-relief device for switchgear according to claim 7, characterized in that, Both the left cover plate (31) and the right cover plate (32) are provided with several exhaust holes (33).

9. The high-efficiency arc-relief device for switchgear according to claim 1, characterized in that, The bottom outer edge of the cylinder (1) is provided with a perforated seat plate (6), which is bolted to the top side of the pressure relief channel of the switch cabinet (7).

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