A kind of arc discharge pressure relief channel protection plate, arc discharge pressure relief channel and switch cabinet assembly

Abstract

This invention belongs to the field of switchgear, specifically referring to a protective plate for an arc-induced pressure relief channel, an arc-induced pressure relief channel, and a switchgear assembly. The arc-induced pressure relief channel includes two or more sealed channel units. The inner and outer sides of the joint ends of every two adjacent channel units are fixedly connected by an inner liner plate and a protective plate extending along the joint of the adjacent channel units. The protective plate and the inner liner plate are each provided with mounting holes for connection to the two channel units. The protective plate is provided with clearance holes to avoid the connecting bolts of the inner liner plate and the channel units; the size of the clearance holes is configured to be larger than the size of the connecting bolts. When one channel unit is removed, the inner liner plate remains connected to the other channel unit. When the removed channel unit is reinstalled, the inner liner plate remains stationary as an installation reference, significantly improving the positioning accuracy and ease of disassembly and reassembly during repeated disassembly and reassembly of the channel units, thereby improving the sealing performance of the arc-induced pressure relief channel during long-term use.

Description

Technical Field

[0001] This invention belongs to the field of switchgear, and in particular relates to a protective plate for an arc-induced pressure relief channel, an arc-induced pressure relief channel, and a switchgear assembly. Background Technology

[0002] Switchgear, as a crucial component of power systems, undertakes key functions such as power distribution, control, and protection. For safety reasons, existing switchgear is equipped with an arc-relief channel. When internal arcing occurs within the switchgear, the high pressure and high-temperature splashes generated by the faulty arc can be rapidly released through this channel, thus ensuring the safety of personnel and the switchgear equipment.

[0003] In the prior art, Chinese invention patent application CN114784692A discloses an arc-induced pressure relief device for switchgear. This device includes a pressure relief frame and a flow-guiding frame installed on the top of the switchgear. The pressure relief frame has a vertical pressure relief channel, and the flow-guiding frame surrounds the pressure relief frame and has a horizontal flow-guiding channel. The flow-guiding frame is assembled from several plates, and its surface has several reinforcing ribs. When an arc occurs inside the switchgear, the high pressure and splashes generated by the arc are first fully relieved by the pressure relief frame, and then flow out of the switchgear cabinet or to a gas recovery device through the flow-guiding channel of the flow-guiding frame, thereby ensuring the safety of personnel and the switchgear equipment.

[0004] When multiple switchgear cabinets are used in parallel, multiple flow guide frames also need to be arranged side by side. However, during installation, the flow guide frames of the aforementioned arc relief device may be difficult to connect due to manufacturing errors. In addition, when the internal components of the flow guide frame need to be disassembled and maintained, the reinforcing ribs, the larger sealing plates that form the flow guide channel, and the inner lining plates connected to the inner peripheral walls of adjacent large sealing plates need to be disassembled and reassembled in sequence, which is quite complicated. Moreover, when the large sealing plates are reinstalled, misalignment may occur between adjacent large sealing plates, causing high-pressure gas and high-temperature splashes to fly out from the flow guide channel, reducing the sealing performance of the arc relief channel of the switchgear and threatening the safety of personnel and the equipment of the switchgear. Summary of the Invention

[0005] The purpose of this invention is to provide a protective plate for an arc-induced pressure relief channel, thereby solving the technical problems of inconvenient disassembly and assembly and easy sealing failure in existing arc-induced pressure relief devices. Another purpose of this invention is to provide an arc-induced pressure relief channel and a switchgear assembly to solve the same technical problems.

[0006] To achieve the above objectives, the technical solution for the arc venting pressure relief channel provided by this invention is as follows: An arc-induced pressure relief channel is provided for connection to the top of a switch cabinet and for communication with the cabinet's pressure relief channel through a bottom opening. The channel comprises two or more sealed channel units. Each channel unit has a connection hole for connecting to the cabinet. The inner and outer sides of the connecting ends of every two adjacent channel units are fixedly connected by an inner lining plate and a protective plate extending along the joint of the adjacent channel units. The protective plate and the inner lining plate each have mounting holes for connection to the two channel units. The protective plate has clearance holes to avoid the connecting bolts of the inner lining plate and the channel units. The size of the clearance holes is configured to be larger than the size of the connecting bolts so that the inner lining plate remains connected to the other channel unit when one channel unit is removed.

[0007] This invention is an improved invention, and its beneficial effects are as follows: The inner liner and the protective plate are fixedly connected on the inner and outer sides of the connecting ends of two adjacent channel units in the arc-relieving channel using connecting bolts. By providing clearance holes on the protective plate for the connecting bolts to pass through, when one channel unit and its protective plate are removed, the inner liner remains fixed to the adjacent channel unit. When the channel unit is reinstalled, the installation reference remains unchanged, thereby improving the positioning accuracy and ease of disassembly and reassembly of the channel unit during repeated disassembly and reassembly, and simultaneously improving the sealing performance of the arc-relieving channel during long-term use.

[0008] As a further improvement, the connection holes on each channel unit, the mounting holes on the protective plate and the inner lining plate are all adjustable positioning holes to adaptively compensate for the errors between each channel unit and between each channel unit and the top of the cabinet.

[0009] As a further improvement, each channel unit has an outward-facing side flange at its connecting end, and the surfaces of the side flanges of two adjacent channel units are in contact with each other. The protective plate includes a covering portion covering the outer periphery of the side flange, and connecting portions for connecting two channel units are provided on both sides of the covering portion. The mounting holes are provided on the connecting portions.

[0010] As a further improvement, a reinforcing frame is connected to the top outer side of each channel unit, and the connecting part of the protective plate is provided with a cut. The end of the reinforcing frame is engaged with the cut of two adjacent protective plates along the extension direction of the channel unit.

[0011] As a further improvement, an observation window is provided on one side of each channel unit.

[0012] As a further improvement, a burn-proof plate is fixedly connected to the top inner side of each channel unit.

[0013] As a further improvement, each channel unit includes a front sealing plate and a rear sealing plate that are assembled together, with the top of the front sealing plate overlapping the outer surface of the rear sealing plate, so that the front sealing plate can be disassembled and installed independently.

[0014] To achieve the above objectives, the technical solution for the protective plate for the arc-venting pressure relief channel provided by this invention is as follows: A protective plate for an arc-induced pressure relief channel includes two connecting portions for connecting two adjacent channel units of the arc-induced pressure relief channel. Between the two connecting portions is a cover portion for covering the outside of the joint of the adjacent channel units. The connecting portions are provided with mounting holes for connecting to the two channel units, and also with clearance holes for avoiding connecting bolts of the connecting channel units and the inner lining plate that is attached to their inner surfaces. The diameter of the clearance holes is configured to be larger than the maximum radial dimension of the connecting bolts.

[0015] This invention is a pioneering invention, and its beneficial effects are as follows: The inner liner and the protective plate are fixedly connected on the inner and outer sides of the connecting ends of two adjacent channel units in the arc-relieving channel using connecting bolts. By providing clearance holes on the protective plate for the connecting bolts to pass through, when one channel unit and its protective plate are removed, the inner liner remains fixed to the adjacent channel unit. When the channel unit is reinstalled, the installation reference remains unchanged, thereby improving the positioning accuracy and ease of disassembly and reassembly of the channel unit during repeated disassembly and reassembly, and simultaneously improving the sealing performance of the arc-relieving channel during long-term use.

[0016] As a further improvement, the mounting holes are adjustable positioning holes to adaptively compensate for errors between each channel unit and between each channel unit and the top of the cabinet.

[0017] To achieve the above objectives, the technical solution for the switchgear assembly provided by this invention is as follows: A switch cabinet assembly includes two or more switch cabinets. The top of each switch cabinet is sealed with an arc-induced pressure relief channel, which communicates with a pressure relief channel in the cabinet via a bottom opening. This arc-induced pressure relief channel comprises two or more sealed channel units. Each channel unit has a connection hole for connecting to the cabinet. The inner and outer sides of the connecting ends of every two adjacent channel units are fixedly connected by an inner lining plate and a protective plate extending along the joint of the adjacent channel units. The protective plate and the inner lining plate each have mounting holes for connecting to the two channel units. The protective plate has clearance holes to avoid the connecting bolts that connect the inner lining plate and the channel units. The size of the clearance holes is configured to be larger than the size of the connecting bolts so that the inner lining plate remains connected to the other channel unit when one channel unit is removed.

[0018] This invention is an improved invention, and its beneficial effects are as follows: The inner liner and the protective plate are fixedly connected on the inner and outer sides of the connecting ends of two adjacent channel units in the arc-relieving channel using connecting bolts. By providing clearance holes on the protective plate for the connecting bolts to pass through, when one channel unit and its protective plate are removed, the inner liner remains fixed to the adjacent channel unit. When the channel unit is reinstalled, the installation reference remains unchanged, thereby improving the positioning accuracy and ease of disassembly and reassembly of the channel unit during repeated disassembly and reassembly, and simultaneously improving the sealing performance of the arc-relieving channel during long-term use.

[0019] As a further improvement, the connection holes on each channel unit, the mounting holes on the protective plate and the inner lining plate are all adjustable positioning holes to adaptively compensate for the errors between each channel unit and between each channel unit and the top of the cabinet.

[0020] As a further improvement, each channel unit has an outward-facing side flange at its connecting end, and the surfaces of the side flanges of two adjacent channel units are in contact with each other. The protective plate includes a covering portion covering the outer periphery of the side flange, and connecting portions for connecting two channel units are provided on both sides of the covering portion. The mounting holes are provided on the connecting portions.

[0021] As a further improvement, a reinforcing frame is connected to the top outer side of each channel unit, and the connecting part of the protective plate is provided with a cut. The end of the reinforcing frame is engaged with the cut of two adjacent protective plates along the extension direction of the channel unit.

[0022] As a further improvement, an observation window is provided on one side of each channel unit.

[0023] As a further improvement, a burn-proof plate is fixedly connected to the top inner side of each channel unit.

[0024] As a further improvement, each channel unit includes a front sealing plate and a rear sealing plate that are assembled together, with the top of the front sealing plate overlapping the outer surface of the rear sealing plate, so that the front sealing plate can be disassembled and installed independently. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the switch cabinet assembly in this invention. Figure 2 This is a first-view structural schematic diagram of an embodiment of the arc-relieving channel in this invention; Figure 3 This is a second-view structural schematic diagram of an embodiment of the arc-relieving channel in this invention; Figure 4 This is a third-view structural schematic diagram of an embodiment of the arc-relieving channel in this invention; Figure 5This is a schematic diagram of the front sealing plate of an embodiment of the arc relief channel in this invention; Figure 6 for Figure 5 A magnified view of a portion of region A in the middle; Figure 7 for Figure 5 A magnified view of a portion of region B in the middle; Figure 8 This is a schematic diagram of the protective plate in an embodiment of the arc relief channel of the present invention.

[0026] Explanation of reference numerals in the attached figures: 1. Cabinet; 2. Arc relief channel; 3. Front sealing plate; 4. Rear sealing plate; 5. Channel unit; 6. Protective plate; 7. Inner lining plate; 8. Observation window; 9. Adapter plate; 10. Lower folding edge; 11. Upper folding edge; 12. Clearance hole; 13. Reinforcing frame; 14. End sealing plate; 15. Side folding edge; 16. U-shaped plate; 17. Window; 18. Waist-shaped hole; 19. Connecting part; 20. Covering part. Detailed Implementation

[0027] To address the technical problems of inconvenient disassembly and assembly and easy sealing failure in existing arc-relieving pressure relief devices, the basic technical concept of this invention is as follows: Inner liner plates and protective plates are respectively connected to the inner and outer sides of the connecting ends of two adjacent channel units in the arc-relieving pressure relief channel. Loose holes are provided on the protective plates for the connecting bolts of the channel units and the inner liner plates. This ensures that when the channel units and protective plates are disassembled, the inner liner plates remain fixed to their adjacent channel units, maintaining the installation reference unchanged when the channel units are reassembled. This improves the positioning accuracy and ease of disassembly and assembly during repeated disassembly and assembly of the channel units, while also enhancing the sealing performance of the arc-relieving pressure relief channel during long-term use.

[0028] The present invention will be further described in detail below with reference to the embodiments.

[0029] Specific embodiments of the switchgear assembly provided by the present invention: like Figure 1 As shown, the switchgear assembly includes two or more switchgear cabinets. The top of the cabinet body 1 of each switchgear cabinet is sealed with an arc-induced pressure relief channel 2, which communicates with a pressure relief channel inside the cabinet body 1 through a bottom opening. One end of the arc-induced pressure relief channel 2 connected to the top of the cabinet body 1 is sealed, while the other end is open. The arc-induced pressure relief channel 2 is formed by two or more channel units 5 sequentially and sealed together. Each channel unit 5 has a connection hole for connecting to the top of the cabinet body. Each channel unit 5 includes a detachably connected front sealing plate 3 and a rear sealing plate 4, which are sealed together. The channel unit 5 located near the end of the cabinet body 1 also includes an end sealing plate 14 that is simultaneously sealed to both the front sealing plate 3 and the rear sealing plate 4.

[0030] like Figures 2-4 As shown, the cross-section of the rear sealing plate 4 is L-shaped, and the front sealing plate 3 is connected to the top side of the rear sealing plate 4, so that the bottom of the channel unit 5 connected to the top of the cabinet body 1 is communicated with the inside of the cabinet body 1 of the switchgear. At the connection position of two adjacent channel units 5, the inner and outer surfaces are respectively fixedly connected with a lining plate 7 and a protection plate 6 through connecting bolts. The protection plate 6 and the lining plate 7 are provided with mounting holes respectively connected to two adjacent channel units 5. Both the protection plate 6 and the lining plate 7 extend along the joint of the adjacent front sealing plate 3 and the adjacent rear sealing plate 4 to enhance the connection strength between the channel units 5, and at the same time form a seal on both the inner and outer sides of the joint of the adjacent channel units 5 to prevent the high-pressure gas or splashes of the arc from escaping from the joint, and ensure the sealing performance of the arc-suppressing and pressure-relieving channel 2.

[0031] Among them, the axial ends of the front sealing plate 3 and the rear sealing plate 4 are respectively provided with outward side flips 15. The side flips 15 of the adjacent front sealing plates 3 are fitted together, and the side flips 15 of the adjacent rear sealing plates 4 are fitted together. As Figure 8 shown, the protection plate 6 is in a "U" shape. The middle convex part of the protection plate 6 is a covering part 20 covering the outer periphery of the side flips 15 of two adjacent channel units 5. The two sides of the covering part 20 are respectively connecting parts 19 for connecting two adjacent channel units 5. Two rows of kidney-shaped holes 18 are respectively provided on the two connecting parts 19. The two rows of kidney-shaped holes 18 are respectively fixedly connected to two adjacent front sealing plates 3 and two adjacent rear sealing plates 4 to enhance the structural strength of the connection position of two adjacent channel units 5. The lining plate 7 is in a flat plate shape, and two rows of kidney-shaped holes 18 are provided on the lining plate 7. The lining plate 7 is respectively connected to two adjacent front sealing plates 3 and two adjacent rear sealing plates 4 through two rows of mounting holes. The lining plate 7 can effectively prevent the high-pressure gas or splashes of the arc from escaping along the joint of two adjacent channel units 5, and ensure the sealing performance of the arc-suppressing and pressure-relieving channel 2.

[0032] In this embodiment, the "U"-shaped protection plate 6 can significantly enhance the structural strength of the connection position of two adjacent channel units 5, thereby significantly suppressing local vibration and deformation caused by pressure or other factors, and improving the overall stability and anti-fatigue performance of the arc-suppressing and pressure-relieving channel 2 during use. Of course, in other embodiments, the side flips of the channel unit can be cancelled, and at this time, the protection plate can be directly set into a flat plate structure, and the protection plate directly covers the joint of two adjacent channel units.

[0033] In addition, the connecting part 19 of the protective plate 6 connecting the adjacent front sealing plate 3 is also provided with clearance holes 12 for avoiding the bolts connecting the inner liner plate 7 and the two adjacent front sealing plates 3. The size of the clearance holes 12 is larger than the size of the connecting bolts connecting the inner liner plate 7 and the two adjacent front sealing plates 3, so that when the protective plate 6 needs to be removed, the inner liner plate 7 can still be reliably connected to the front sealing plate 3. The connecting part 19 of the protective plate 6 connecting the adjacent rear sealing plate 4 is also provided with clearance holes 12 for avoiding the bolts connecting the inner liner plate 7 and the two adjacent rear sealing plates 4, so that when the protective plate 6 needs to be removed, the inner liner plate 7 can still be reliably connected to the rear sealing plate 4.

[0034] like Figures 5-7 As shown, the front sealing plate 3 has an outward-facing side-flipping edge 15 at its top, with a waist-shaped hole 18 on the side-flipping edge 15. An upward-facing upward-flipping edge 11 is also provided outside the side-flipping edge 15. The front sealing plate 3 is connected to the rear sealing plate 4 via the side-flipping edge 15, allowing the front sealing plate 3 to overlap the outer surface of the rear sealing plate 4. The bottom of the front sealing plate 3 has an outward-facing downward-flipping edge 10, with a waist-shaped hole 18 on the downward-flipping edge 10. Bolts are used to pass through the waist-shaped hole 18 on the downward-flipping edge 10 and the mounting hole at the top of the cabinet 1, fixing the front sealing plate 3 to the top of the cabinet 1. The bottom of the rear sealing plate 4 is connected to a transition plate 9, which has waist-shaped holes 18. All waist-shaped holes 18 extend axially along the arc-relieving channel 2. Bolts are used to pass through the waist-shaped holes 18 on the transition plate 9 and the mounting hole at the top of the cabinet 1, fixing the rear sealing plate 4 to the top of the cabinet 1.

[0035] When connecting the arc relief channel 2 and the cabinet 1, the bolts pass through each channel unit 5 and the top of the cabinet 1 from top to bottom, realizing a one-way connection from the arc relief channel 2 to the switch cabinet 1. The advantage of this setting is that when the arc relief channel 2 needs to be removed, there is no need to operate the switch cabinet, thus avoiding interference with the components inside the switch cabinet.

[0036] When maintenance and repair of the internal structure of the arc flaming pressure relief channel 2 are required, the front sealing plate 3 and its connected protective plate 6 can be removed directly from the location requiring maintenance. Furthermore, the upward-curving edge 11 protrudes from the top of the rear sealing plate 4, making it easier to remove the front sealing plate 3. Compared to the existing method of attaching the rear sealing plate to the outer surface of the front sealing plate, the existing arc flaming pressure relief channel requires the removal of more screws during maintenance due to the larger size of the rear sealing plate, making the operation more cumbersome.

[0037] In this embodiment, except for the clearance hole 12 on the protective plate 6, the mounting holes connecting adjacent channel units 5 are all oblong holes 18. The connecting hole at the bottom of the channel unit 5 is also an oblong hole 18. The oblong hole 18 has a certain length in the extension direction of the channel unit 5, forming a certain axially adjustable dimension between the mounting hole position of the arc relief channel 2 and the mounting hole position on the top of the switchgear. When the arc relief channel 2 is matched with the switchgear in parallel, even if there is a certain axial machining error in the mounting hole position of the switchgear, or the cumulative dimensional deviation after multiple switchgears are paralleled, axial adjustment can still be made through the oblong hole 18 of the channel unit 5 to match the mounting hole position of the arc relief channel 2 with the mounting hole position on the top of the switchgear, so as to achieve smooth installation of the arc relief channel 2 and the top of the switchgear, and significantly improve the adaptability of the arc relief channel 2.

[0038] In other embodiments, the upturned edge of the front cover plate can be omitted, and the oblong hole 18 may be an adjustable positioning hole of other shapes, such as a strip hole. In fact, it is sufficient as long as the connecting holes on the channel unit, the mounting holes on the protective plate and the inner lining plate can adaptively compensate for the assembly errors between the channel units 5 and between the channel units 5 and the top of the cabinet 1 in the extension direction of the channel unit 5.

[0039] When maintenance and repair of the internal structure of the arc-relief channel 2 are required, simply remove the front sealing plate 3 and the protective plate 6 connected to it at the location requiring maintenance. Specifically, remove the bolts connecting the protective plate 6 to the front sealing plate 3, the bolts connecting the front sealing plate 3 and the rear sealing plate 4, and the bolts connecting the front sealing plate 3 and the top of the cabinet 1 in sequence. It is not necessary to remove the inner lining plate 7 connecting the front sealing plate 3 and its adjacent front sealing plate 3, allowing the inner lining plate 7 to maintain its connection with other channel units 5, thus maintaining the installation reference for reconnecting the front sealing plate 3 with its adjacent front sealing plates 3. After maintenance and repair of the internal structure of the arc-relief channel 2 corresponding to the front sealing plate 3, the front sealing plate 3 does not need to be repositioned or the inner lining plate 7 readjusted to maintain the seal at the joint between the front sealing plate 3 and the adjacent front sealing plate 3. This significantly improves the positioning accuracy and ease of operation of the front sealing plate 3 during repeated installation, while effectively ensuring the assembly efficiency of the channel unit 5 and the sealing reliability before and after disassembly, thereby improving the reliability of the arc-relief channel 2.

[0040] In other embodiments, the channel unit may be composed of a single, semi-circular channel. In this case, when maintenance of components within the arc-venting pressure relief channel is required, the entire channel unit must be removed. Alternatively, in other embodiments, it is possible to overlap the rear sealing plate with the outer surface of the front sealing plate. For example, the flow guide channel disclosed in Chinese invention patent application CN114784692A cited in the background art allows the entire pressure relief frame located within the flow guide channel to be exposed after removing the large rear sealing plate, facilitating large-area maintenance.

[0041] Based on the above embodiment, a reinforcing frame 13 is connected to the top of the rear sealing plate 4. For the protective plate 6 connecting the rear sealing plate 4 and its adjacent rear sealing plates 4, cutouts are provided on the two connecting portions 19 of the protective plate 6. The two ends of the reinforcing frame 13 are respectively engaged within the cutouts of the two adjacent protective plates 6. The protective plate 6 and the reinforcing frame 13 form a cross structure on the outer surface of the rear sealing plate 4, which helps to further strengthen the top of the rear sealing plate 4 and the connection strength at the joint of adjacent rear sealing plates 4, thereby improving the reliability of the arc relief channel 2 during use.

[0042] Based on the above implementation methods, such as Figure 3 and Figure 4 As shown, each channel unit 5 has an observation window 8 on one side, preferably located on the rear sealing plate 4 of each channel unit 5. In the event of an arcing failure, the observation window 8 allows for easy observation of the internal condition of the arcing pressure relief channel 2, enabling appropriate countermeasures to be taken. Specifically, the rear sealing plate 4 has a window 17, and the observation window 8 is fixedly connected to the outside of the window 17 by bolts. The bolts are arranged around the outer perimeter of the window 17 to prevent the arc from escaping from the window 17 and to strengthen the connection between the observation window 8 and the rear sealing plate 4. Furthermore, in some simple maintenance scenarios, the observation window 8 can be moved to facilitate quick maintenance of the arcing pressure relief channel.

[0043] Preferably, a U-shaped plate 16 is also connected to the outside of the observation window 8, and the two ends of the U-shaped plate 16 along the axial direction are fixedly connected to the main structure of the observation window 8. The cross-section of the U-shaped plate 16 can effectively enhance the deformation resistance of the observation window 8, and the U-shaped structure can facilitate hand grip and force application, and can be used as a handle for pushing, pulling or rotating the observation window 8.

[0044] Based on the above implementation methods, such as Figure 3 As shown, each channel unit 5 has an anti-burn plate connected to its top inner wall. The anti-burn plate and the rear sealing plate 4 are connected by bolts, and the installation area of ​​the anti-burn plate covers the part of the arc relief channel 2 most susceptible to high temperature when an arc occurs. Furthermore, the flame resistance and strength of the anti-burn plate are higher than those of the rear sealing plate 4. When a high-temperature flame or arc is generated inside the switch cabinet or inside the arc relief channel 2 due to a short circuit or other fault, the anti-burn plate, as the first line of protection, can directly withstand and resist the thermal shock and high-temperature ablation generated by the high-temperature flame and arc, significantly reducing the risk of burn-through, deformation, or structural failure of each channel unit 5 of the arc relief channel 2, and improving the reliability of the arc relief channel 2 during use.

[0045] Specific embodiments of the protective plate for the arc-venting pressure relief channel provided by the present invention: Specifically, the implementation method of the protective plate for the arc relief channel is the same as the protective plate described in any of the above-mentioned implementation methods of the switchgear, and will not be described in detail here.

[0046] Specific implementation of the arc-relieving channel provided by the present invention: Specifically, the implementation method of the arc-induced pressure relief channel is the arc-induced pressure relief channel described in any of the above-mentioned implementation methods of the switchgear, and will not be further described here.

[0047] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An arc-induced pressure relief channel, used to connect to the top of a switchgear cabinet and capable of communicating with the cabinet's pressure relief channel through a bottom opening, characterized in that, The arc-induced pressure relief channel includes two or more sealed channel units. Each channel unit has a connection hole for connecting to the cabinet. The inner and outer sides of the joint of every two adjacent channel units are fixedly connected by an inner lining plate and a protective plate extending along the joint of the adjacent channel units. The protective plate and the inner lining plate are respectively provided with mounting holes to connect to the two channel units through the mounting holes. The protective plate is provided with clearance holes to avoid the connecting bolts connecting the inner lining plate and the channel unit. The size of the clearance holes is configured to be larger than the size of the connecting bolts so that the inner lining plate can remain connected to the other channel unit when one channel unit is removed.

2. The arc-relieving pressure channel according to claim 1, characterized in that, The connection holes on each channel unit, as well as the mounting holes on the protective plate and inner lining plate, are all adjustable positioning holes to adaptively compensate for errors between each channel unit and between each channel unit and the top of the cabinet.

3. The arc-relieving channel according to claim 1 or 2, characterized in that, Each channel unit has an outward-facing side flange at its connecting end. The surfaces of the side flanges of two adjacent channel units are in contact with each other. The protective plate includes a covering portion that covers the outer periphery of the side flange. The two sides of the covering portion are respectively provided with connecting portions for connecting two channel units. The mounting holes are provided on the connecting portions.

4. The arc-relieving channel according to claim 3, characterized in that, Each channel unit has a reinforcing frame connected to its top outer side. The connecting part of the protective plate has a cutout, and the end of the reinforcing frame is engaged with the cutouts of two adjacent protective plates along the extension direction of the channel unit.

5. The arc-relieving pressure channel according to claim 1 or 2, characterized in that, Each channel unit has an observation window on one side.

6. The arc relief channel according to claim 1 or 2, characterized in that, Each channel unit has a burn-proof plate fixedly connected to the top inner side.

7. The arc-relieving pressure channel according to claim 1 or 2, characterized in that, Each channel unit includes a front sealing plate and a rear sealing plate that are assembled and connected, with the top of the front sealing plate overlapping the outer surface of the rear sealing plate so that the front sealing plate can be disassembled and installed independently.

8. A protective plate for an arc-induced pressure relief channel, characterized in that, It includes two connecting parts for connecting two adjacent channel units of the arc venting channel, and a cover part between the two connecting parts for covering the outside of the joint of the adjacent channel units. The connecting parts are provided with mounting holes for connecting to the two channel units, and also with clearance holes for avoiding the connecting bolts of the connecting channel units and the inner liner plate that fits on their inner surface. The diameter of the clearance holes is configured to be larger than the maximum radial dimension of the connecting bolts.

9. The protective plate for the arc-venting pressure relief channel according to claim 8, characterized in that, The mounting holes are adjustable positioning holes to adaptively compensate for errors between each channel unit and between each channel unit and the top of the cabinet.

10. A switchgear assembly comprising two or more switchgear cabinets, wherein the top of the switchgear cabinet is sealed with an arc relief channel, characterized in that, The arc venting channel is the arc venting channel as described in any one of claims 1-7.

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