A switch cabinet top pressure release device

Abstract

This invention discloses a pressure relief device for the top of a switchgear, belonging to the field of switchgear technology. It includes a basic frame, an arc-extinguishing and pressure-reducing structure, an outer baffle, and a top sealing plate. The basic frame includes a frame fixed to the top of the switchgear and a partition vertically fixed within the frame. The arc-extinguishing and pressure-reducing structure includes a Z-shaped arc-extinguishing plate, an arc-extinguishing plate, a grooved arc-extinguishing plate, and an L-shaped arc-extinguishing plate. The outer baffle surrounds the arc-extinguishing and pressure-reducing structure and is fixed to the frame, and the top sealing plate is fixed to the top of the arc-extinguishing and pressure-reducing structure. When an arc is generated inside the switchgear, the arc will sequentially pass through the arc-extinguishing channel formed by the arc-shaped, grooved, Z-shaped, and L-shaped arc-extinguishing plates, undergoing multiple arc-extinguishing and pressure-reducing effects, resulting in more thorough arc weakening. This device has a simple structure and is easy to install. The remaining gas after multiple arc-extinguishing processes is guided upwards to prevent impact on the sides of the switchgear, ensuring the safety of nearby personnel.

Description

Technical Field

[0001] The invention relates to a switch cabinet top pressure release device, belonging to the technical field of switch cabinets. Background Art

[0002] Switchgear is a common electrical equipment. The external line of the switchgear first enters the main control switch inside the cabinet, and then enters the sub-control switch. Each branch is set according to its needs. The main function of the switchgear is to open and close, control and protect electrical equipment during the process of power generation, transmission, distribution and power conversion in the power system.

[0003] Switchgear is widely used in power distribution systems of urban power supply and industrial and mining enterprises. When the switchgear is working, due to various unexpected reasons, there is a risk of short circuit fault inside the switchgear. When a fault occurs, the arc temperature is high and the energy is large. The arc itself is a very light plasma gas. Under the action of electric power and hot gas, the arc will move and expand at high speed in the cabinet, causing the fault range to expand rapidly. The instantaneous pressure and temperature inside the switchgear rise rapidly. Usually, the top plate of the compartment in the cabinet will be opened, and there is also a risk of the front and rear sealing plates or door panels of the switchgear being opened. After the high-energy and high-temperature gas rushes out of the cabinet, it will cause serious burns to people near the equipment, and even endanger their lives. There is also a risk of damage to adjacent electrical equipment. The installation of an arc channel on the top of the switchgear can avoid the above risks, but the arc channel is generally large in size, cumbersome to install, high in cost, and requires a fixed smoke exhaust space.

[0004] Therefore, in order to prevent the danger of explosion caused by arcing inside the switch cabinet, a switch cabinet top pressure relief device is designed. The pressure relief device is installed on the top of the switch cabinet, which can effectively and quickly decompose and eliminate the arcing expansion pressure to ensure the safety of personnel near the equipment. The top pressure relief device has the advantages of easy installation, small size, high safety and reliability, and low cost. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a pressure release device on the top of a switch cabinet, which solves the problem that there is no pressure release device with a simple structure and convenient installation on the current switch cabinet.

[0006] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0007] A switch cabinet top pressure release device comprises a basic frame, an arc extinguishing pressure relief structure, an outer baffle and a top sealing plate;

[0008] The basic frame includes a frame fixed to the top of the switch cabinet, and a partition vertically fixed in the frame, the partition dividing the frame into a plurality of independent arc extinguishing and pressure reducing areas;

[0009] The arc extinguishing and decompression structure comprises a Z-shaped arc extinguishing plate, a bow-shaped arc extinguishing plate, a groove-shaped arc extinguishing plate, and an L-shaped arc extinguishing plate, wherein a plurality of primary arc extinguishing holes are evenly opened on the bow-shaped arc extinguishing plate, a plurality of secondary arc extinguishing holes are evenly opened on the groove-shaped arc extinguishing plate, and a plurality of tertiary arc extinguishing holes are evenly opened on the side of the Z-shaped arc extinguishing plate;

[0010] The bottoms of two symmetrically arranged Z-shaped arc-extinguishing plates are fixed on both sides of the frame, and multiple arch-shaped arc-extinguishing plates are connected between the two Z-shaped arc-extinguishing plates. The partitions extend upward from the gaps between the arch-shaped arc-extinguishing plates and are fixed to the top sealing plates. The partitions separate the arch-shaped arc-extinguishing plates into independent arc-extinguishing and decompression areas. The tertiary arc-extinguishing holes on the sides of the Z-shaped arc-extinguishing plates are located above the arch-shaped arc-extinguishing plates. A slot-shaped arc-extinguishing plate that seals the tertiary arc-extinguishing holes is fixed on the inner side of the Z-shaped arc-extinguishing plates, and an L-shaped arc-extinguishing plate is fixed on the outer side of the Z-shaped arc-extinguishing plates.

[0011] The outer baffle plate surrounds the arc extinguishing and pressure relief structure and is fixed on the frame, the top sealing plate is fixed on the top of the arc extinguishing and pressure relief structure, two opposite side plates of the top sealing plate seal the two end faces of the Z-shaped arc extinguishing plate and the gap between the end faces and the frame, the other two opposite side plates of the top sealing plate block the outside of the three arc extinguishing holes and leave an exhaust port at the bottom, the L-shaped arc extinguishing plate closes the exhaust port, the L-shaped arc extinguishing plate adopts a mesh plate, and an exhaust channel opening upward is left between the side of the top sealing plate and the outer baffle plate.

[0012] As a preferred example, a reinforcing plate is provided on the inner side of the frame.

[0013] As a preferred example, the Z-shaped arc extinguishing plate is a Z-shaped structure formed by bending a top horizontal plate, a middle side plate and a bottom horizontal plate. The bottom horizontal plate is located on the outside of the middle side plate and fixed on the frame. The upper half of the middle side plate is evenly provided with vertical strips of tertiary arc extinguishing holes. The top horizontal plate is located on the inside of the middle side plate. A groove-shaped arc extinguishing plate that encloses the tertiary arc extinguishing holes is fixed below the top horizontal plate. The top of the top horizontal plate is fixed to the top sealing plate, and the sides of the groove-shaped arc extinguishing plate are also evenly provided with horizontal strips of secondary arc extinguishing holes.

[0014] As a preferred example, the arc-shaped arc-extinguishing plate is an arc-shaped plate or a bent plate with an arc-shaped cross section, and strip-shaped primary arc-extinguishing holes are evenly opened on the arc-shaped plate or the bent plate.

[0015] As a preferred example, the top sealing plate is composed of a top plate, two fixed side plates arranged on the opposite sides, and two exhaust side plates arranged on the opposite sides, wherein an outward folded edge is provided at the bottom of the fixed side plate, the fixed side plate is fixed on the end faces of a pair of Z-shaped arc extinguishing plates, the folded edge is fixed on the frame, the fixed side plate closes the two end faces of the Z-shaped arc extinguishing plates and the gap between the end faces and the frame, an exhaust port is provided at the bottom of the exhaust side plate, the top plate is fixed to the top of the partition, and the partition separates the frame and the inside of the top sealing plate into multiple independent arc extinguishing and decompression areas.

[0016] As a preferred example, four lifting plates with lifting holes are fixed to the four corners of the top of the top sealing plate.

[0017] The beneficial effects of the present invention are:

[0018] (1) The switch cabinet is provided with a trolley room, a busbar room, a cable room and other areas. Arc extinguishing and pressure relief areas corresponding to the trolley room, the busbar room, the cable room and other areas are separated by partitions inside the device. Each arc extinguishing and pressure relief area is independent of each other, so that the device can provide arc extinguishing and pressure relief effects for different areas without affecting each other;

[0019] (2) When an arc is generated inside the switch cabinet, the arc will pass through the compact and efficient arc extinguishing channel composed of the bow-shaped arc extinguishing plate, the groove-shaped arc extinguishing plate, the Z-shaped arc extinguishing plate, and the L-shaped arc extinguishing plate in sequence, and perform multiple arc extinguishing and pressure reduction actions, making the arc weaken more thoroughly;

[0020] (3) The device has a simple structure and is easy to install. The remaining gas after multiple arc extinguishing will be guided to diffuse upward to prevent impact on the side of the switch cabinet, thus ensuring the safety of nearby personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the disassembled structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the appearance structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the basic frame structure;

[0024] Figure 4 It is a schematic diagram of the installation structure of the arc extinguishing pressure relief structure, the peripheral baffle plate and the top sealing plate;

[0025] Figure 5 It is a schematic diagram of the structure of the top sealing plate and the L-shaped arc extinguishing plate;

[0026] Figure 6 It is a schematic diagram of the local structure of the bow-shaped arc-extinguishing plate;

[0027] Figure 7 It is a structural schematic diagram of the arc passing through the primary arc extinguishing hole and the secondary arc extinguishing hole;

[0028] Figure 8 It is a schematic diagram of the arc extinguishing path of the present invention.

[0029] In the figure: basic frame 1, arc extinguishing and decompression structure 2, outer baffle plate 3, top sealing plate 4, frame 101, partition plate 102, reinforcing plate 103, Z-shaped arc extinguishing plate 201, top transverse plate 2011, middle side plate 2012, bottom transverse plate 2013, bow-shaped arc extinguishing plate 202, groove-shaped arc extinguishing plate 203, L-shaped arc extinguishing plate 204, primary arc extinguishing hole 205, secondary arc extinguishing hole 206, tertiary arc extinguishing hole 207, top plate 401, fixed side plate 402, exhaust side plate 403, folded edge 404, exhaust port 405, exhaust channel 406, lifting plate 407. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0031] Example 1

[0032] like Figure 1-Figure 8 As shown, a switch cabinet top pressure release device comprises a basic frame 1, an arc extinguishing pressure relief structure 2, an outer baffle plate 3 and a top sealing plate 4.

[0033] The basic frame 1 includes a frame 101 fixed to the top of the switch cabinet, the frame 101 matches the shape of the top of the switch cabinet and is tightly fixed by screwing, and a partition 102 vertically fixed in the frame 101, the partition 102 divides the frame 101 into multiple independent arc extinguishing and decompression areas; a reinforcing plate 103 is provided on the inner side of the frame of the frame 101.

[0034] The arc extinguishing pressure relief structure 2 comprises a Z-shaped arc extinguishing plate 201, a bow-shaped arc extinguishing plate 202, a groove-shaped arc extinguishing plate 203, and an L-shaped arc extinguishing plate 204, wherein a plurality of primary arc extinguishing holes 205 are evenly provided on the bow-shaped arc extinguishing plate 202, a plurality of secondary arc extinguishing holes 206 are evenly provided on the groove-shaped arc extinguishing plate 203, and a plurality of tertiary arc extinguishing holes 207 are evenly provided on the side of the Z-shaped arc extinguishing plate 201; the primary arc extinguishing holes 205, the secondary arc extinguishing holes 206, and the tertiary arc extinguishing holes 207 are all strip-shaped oblong holes, wherein the secondary arc extinguishing holes 206 and the tertiary arc extinguishing holes 207 are arranged to intersect vertically or to be arranged to be shifted and staggered left and right. The L-shaped arc extinguishing plate 204 adopts a mesh plate structure with IP4X.

[0035] The bottoms of two symmetrically arranged Z-shaped arc-extinguishing plates 201 are fixed on both sides of the frame 101, and a plurality of arched arc-extinguishing plates 202 are connected between the two Z-shaped arc-extinguishing plates 201. The cross-section of the arched arc-extinguishing plates 202 is arched, and the center axis position is arched upward. The two ends of the arched arc-extinguishing plates 202 are fixed to the inner side of the Z-shaped arc-extinguishing plates 201 by screwing. The partition 102 extends upward from the gap between the arched arc-extinguishing plates 202 and is fixed to the top sealing plate 4. The partition 102 divides the arched arc-extinguishing plates 202 into Separated in each independent arc extinguishing and decompression area, the tertiary arc extinguishing holes 207 on the side of the Z-shaped arc extinguishing plate 201 are located above the bow-shaped arc extinguishing plate 202, a groove-shaped arc extinguishing plate 203 is fixed on the inner side of the Z-shaped arc extinguishing plate 201 to enclose the tertiary arc extinguishing holes 207, and an L-shaped arc extinguishing plate 204 is fixed on the outer side of the Z-shaped arc extinguishing plate 201; the bow-shaped arc extinguishing plate 202 adopts an arc-shaped plate or a bent plate with an arc-shaped cross-section, and the arc-shaped plate or the bent plate is evenly provided with strip-shaped primary arc extinguishing holes 205.

[0036] The outer baffle plate 3 surrounds the arc extinguishing and decompression structure 2 and is fixed on the frame 101. The top sealing plate 4 is fixed on the top of the arc extinguishing and decompression structure 2. Two opposite side plates of the top sealing plate 4 seal the two end faces of the Z-shaped arc extinguishing plate 201 and the gap between the end faces and the frame 101. The other two opposite side plates of the top sealing plate 4 block the outside of the tertiary arc extinguishing hole 207 and leave an exhaust port 405 below. The L-shaped arc extinguishing plate 204 closes the exhaust port 405. The L-shaped arc extinguishing plate 204 adopts a mesh plate, and an upward-opening exhaust channel 406 is left between the side of the top sealing plate 4 and the outer baffle plate 3.

[0037] Working principle:

[0038] When a short circuit occurs, an arc is generated inside the switch cabinet, and the pressure and temperature inside the switch cabinet rise rapidly. The high-temperature and high-pressure gas and particles in the cabinet rush upward into the device.

[0039] When high-temperature, high-pressure gas and particles reach this arc-extinguishing pressure relief device:

[0040] (1) First, the arc-shaped arc-extinguishing plate 202 has the function of blocking, weakening and cooling the arc. In particular, the curved surface of the arc-shaped arc-extinguishing plate 202 and the densely distributed primary arc-extinguishing holes 205 on the plate have the function of decomposing the arc.

[0041] (2) Then, after the high-temperature, high-pressure gas and particles pass through the bow-shaped arc-extinguishing plate 202, they pass through the independent flow diversion design of each area formed by the partition plate 102 and the top sealing plate 4, and the arc will pass laterally through the groove-shaped arc-extinguishing plate 203. The groove-shaped arc-extinguishing plate 203 is densely covered with transverse secondary arc-extinguishing holes 206, which also have the effect of blocking, dispersing and weakening the high-temperature, high-pressure gas and particles generated by the arc;

[0042] (3) Then, after passing through the secondary arc-extinguishing holes 206 of the slot-shaped arc-extinguishing plate 203, the energy generated by the arc has been weakened, and the remaining high-temperature, high-pressure gas and particles pass through the guide channel to the tertiary arc-extinguishing holes 207 of the Z-shaped arc-extinguishing plate 201. The Z-shaped arc-extinguishing plate 201 is densely covered with vertical tertiary arc-extinguishing holes 207, which further divide and block the high-temperature, high-pressure gas and particles generated by the arc.

[0043] (4) Finally, the arc pressure has weakened and the energy has dropped rapidly. The remaining high-temperature, high-pressure gas and particles reach the L-shaped arc extinguishing plate 204 from the exhaust ports 405 on both sides of the top sealing plate 4. The L-shaped arc extinguishing plate 204 is a mesh structure with IP4X, which will prevent larger particles from rushing out of the cabinet. At the same time, the energy generated by the arc is further weakened, and the remaining gas and tiny particles will be discharged out of the cabinet. At this time, the outer baffle 3 will guide the remaining gas to diffuse upward, ensuring the safety of nearby personnel.

[0044] Example 2

[0045] like Figure 7 , Figure 8 As shown, the Z-shaped arc-extinguishing plate 201 is a Z-shaped structure formed by bending the top horizontal plate 2011, the middle side plate 2012, and the bottom horizontal plate 2013. The bottom horizontal plate 2013 is located outside the middle side plate 2012 and fixed on the frame 101. The upper half of the middle side plate 2012 is evenly provided with vertical strip-shaped tertiary arc-extinguishing holes 207. The top horizontal plate 2011 is located inside the middle side plate 2012. A slot-shaped arc-extinguishing plate 203 is fixed below the top horizontal plate 2011 to enclose the tertiary arc-extinguishing holes 207. The top of the top horizontal plate 2011 is fixed to the top sealing plate 4. The side of the slot-shaped arc-extinguishing plate 203 is also evenly provided with horizontal strip-shaped secondary arc-extinguishing holes 206. Other structures are the same as those in Example 1.

[0046] The Z-shaped arc extinguishing plate 201 can be used to install the bow-shaped arc extinguishing plate 202, the groove-shaped arc extinguishing plate 203, and the L-shaped arc extinguishing plate 204. It is easy to assemble. The top of the Z-shaped arc extinguishing plate 201 is fixed to the top sealing plate 4 to play a supporting role, further improving the overall impact resistance.

[0047] Example 3

[0048] like Figure 5As shown, the top sealing plate 4 is composed of a top plate 401, two fixed side plates 402 arranged on the opposite sides, and two exhaust side plates 403 arranged on the opposite sides, wherein the bottom of the fixed side plate 402 is provided with an outward folding edge 404, the fixed side plate 402 is fixed on the end faces of a pair of Z-shaped arc-extinguishing plates 201, the folding edge 404 is fixed on the frame 101, the fixed side plate 402 seals the two end faces of the Z-shaped arc-extinguishing plate 201 and the gap between the end faces and the frame 101, the bottom of the exhaust side plate 403 is provided with an exhaust port 405, the top plate 401 is fixed to the top of the partition 102, and the partition 102 divides the frame 101 and the interior of the top sealing plate 4 into multiple independent arc-extinguishing pressure relief areas. The other structures are the same as those in Example 1.

[0049] The top sealing plate 4 seals both ends of the Z-shaped arc extinguishing plate 201 through two fixed side plates 402, and discharges the remaining gas through the exhaust port 405 reserved in the exhaust side plate 403, forming a labyrinth-like drainage channel. After three arc extinguishings, the gas is discharged through the mesh structure of the L-shaped arc extinguishing plate 204, and exhausts upward through the exhaust channel 406 with an upward opening left between the side of the top sealing plate 4 and the outer baffle plate 3, which is safer.

[0050] Example 4

[0051] like Figure 5 As shown, four lifting plates 407 with lifting holes are fixed at the four corners of the top of the top sealing plate 4. Other structures are the same as those in the first embodiment.

[0052] The lifting plate 407 can facilitate the lifting operation of the switch cabinet.

[0053] Based on the above embodiments, it has the following advantages:

[0054] (1) The switch cabinet is provided with a trolley room, a busbar room, a cable room and other areas. Arc extinguishing and pressure relief areas corresponding to the trolley room, the busbar room, the cable room and other areas are separated in the device by a partition 102. Each arc extinguishing and pressure relief area is independent of each other, so that the device can provide arc extinguishing and pressure relief effects for different areas without affecting each other;

[0055] (2) When an arc is generated inside the switch cabinet, the arc will sequentially pass through a compact and efficient arc extinguishing channel formed by the bow-shaped arc extinguishing plate 202, the groove-shaped arc extinguishing plate 203, the Z-shaped arc extinguishing plate 201, and the L-shaped arc extinguishing plate 204, and perform multiple arc extinguishing and pressure reduction actions, so that the arc is weakened more thoroughly;

[0056] (3) The device has a simple structure and is easy to install. The remaining gas after multiple arc extinguishing will be guided to diffuse upward to prevent impact on the side of the switch cabinet, thus ensuring the safety of nearby personnel.

[0057] The above shows and describes the basic principles, main technical features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A switch cabinet top pressure relief device, characterized in that: It includes a basic frame, an arc-extinguishing pressure relief structure, an outer baffle and a top sealing plate; The basic frame includes a frame fixed to the top of the switch cabinet, and a partition vertically fixed in the frame, the partition dividing the frame into a plurality of independent arc extinguishing and pressure reducing areas; The arc extinguishing and decompression structure comprises a Z-shaped arc extinguishing plate, a bow-shaped arc extinguishing plate, a groove-shaped arc extinguishing plate, and an L-shaped arc extinguishing plate, wherein a plurality of primary arc extinguishing holes are evenly opened on the bow-shaped arc extinguishing plate, a plurality of secondary arc extinguishing holes are evenly opened on the groove-shaped arc extinguishing plate, and a plurality of tertiary arc extinguishing holes are evenly opened on the side of the Z-shaped arc extinguishing plate; The bottoms of two symmetrically arranged Z-shaped arc-extinguishing plates are fixed on both sides of the frame, and multiple arch-shaped arc-extinguishing plates are connected between the two Z-shaped arc-extinguishing plates. The partitions extend upward from the gaps between the arch-shaped arc-extinguishing plates and are fixed to the top sealing plates. The partitions separate the arch-shaped arc-extinguishing plates into independent arc-extinguishing and decompression areas. The tertiary arc-extinguishing holes on the sides of the Z-shaped arc-extinguishing plates are located above the arch-shaped arc-extinguishing plates. A slot-shaped arc-extinguishing plate that seals the tertiary arc-extinguishing holes is fixed on the inner side of the Z-shaped arc-extinguishing plates, and an L-shaped arc-extinguishing plate is fixed on the outer side of the Z-shaped arc-extinguishing plates. The outer baffle plate surrounds the arc extinguishing and pressure relief structure and is fixed on the frame, the top sealing plate is fixed on the top of the arc extinguishing and pressure relief structure, two opposite side plates of the top sealing plate seal the two end faces of the Z-shaped arc extinguishing plate and the gap between the end faces and the frame, the other two opposite side plates of the top sealing plate block the outside of the three arc extinguishing holes and leave an exhaust port at the bottom, the L-shaped arc extinguishing plate closes the exhaust port, the L-shaped arc extinguishing plate adopts a mesh plate, and an exhaust channel opening upward is left between the side of the top sealing plate and the outer baffle plate.

2. A switch cabinet top pressure relief device according to claim 1, characterized in that: A reinforcing plate is arranged on the inner side of the frame.

3. The switch cabinet top pressure release device according to claim 1, characterized in that: The Z-shaped arc extinguishing plate is a Z-shaped structure formed by bending a top horizontal plate, a middle side plate and a bottom horizontal plate. The bottom horizontal plate is located on the outside of the middle side plate and fixed on the frame. The upper half of the middle side plate is evenly provided with vertical strips of tertiary arc extinguishing holes. The top horizontal plate is located on the inside of the middle side plate. A groove-shaped arc extinguishing plate that encloses the tertiary arc extinguishing holes is fixed below the top horizontal plate. The top of the top horizontal plate is fixed to the top sealing plate, and the side of the groove-shaped arc extinguishing plate is also evenly provided with horizontal strips of secondary arc extinguishing holes.

4. The switch cabinet top pressure release device according to claim 1, characterized in that: The arc-shaped arc-extinguishing plate is an arc-shaped plate or a bent plate with an arc-shaped cross section, and strip-shaped primary arc-extinguishing holes are evenly opened on the arc-shaped plate or the bent plate.

5. The switch cabinet top pressure release device according to claim 1, characterized in that: The top sealing plate is composed of a top plate, two fixed side plates arranged on the opposite sides, and two exhaust side plates arranged on the opposite sides, wherein an outward folded edge is provided at the bottom of the fixed side plate, the fixed side plate is fixed on the end faces of a pair of Z-shaped arc extinguishing plates, the folded edge is fixed on the frame, the fixed side plate closes the two end faces of the Z-shaped arc extinguishing plates and the gap between the end faces and the frame, an exhaust port is provided at the bottom of the exhaust side plate, the top plate is fixed to the top of the partition, and the partition separates the frame and the inside of the top sealing plate into multiple independent arc extinguishing and decompression areas.

6. A switch cabinet top pressure relief device according to claim 1, characterized in that: Four lifting plates with lifting holes are fixed at the four corners of the top of the top sealing plate.

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