CN107086484A - Switch cabinet and its pressure relief structure - Google Patents

Abstract

The invention relates to the field of switch equipment, in particular to a switch cabinet and a pressure relief structure thereof. The switch cabinet includes a cabinet body, the cabinet body is provided with a pressure relief port, and the pressure relief port is provided with a pressure relief plate, and the pressure relief plate has a pressure relief connection part and a holding connection part for making the pressure relief plate always connected to the cabinet body, The pressure relief port is provided with a foldable baffle plate on the side of the pressure relief plate facing the pressure relief port to form a shield on the side of the pressure relief port close to the holding connection part; or the pressure relief port is provided with a The guide plate on the side of the pressure relief plate facing the pressure relief port, the guide plate is provided with a guide surface for guiding the arc energy in the cabinet to the pressure relief plate away from the area of the maintaining connection part; or the distance between the pressure relief connection part and the pressure relief port The distance between the connecting part and the pressure relief port is kept less than that so that the pressure relief port is eccentrically arranged relative to the pressure relief plate, which solves the problem of potential safety hazards in the current pressure relief structure.

Description

Switch cabinet and its pressure relief structure

technical field

The invention relates to the field of switch equipment, in particular to a switch cabinet and a pressure relief structure thereof.

Background technique

The arc effects generated during the burning of the arc fault inside the switchgear include pressure effects, thermal effects, radiation and acoustic effects. These arcing effects are powerful and will damage switchgear and cause injury to nearby workers. Various switchgear manufacturers have adopted various measures to strengthen the switchgear to protect the switchgear from arcing faults. In addition to strictly ensuring the manufacturing quality of the switchgear, performing correct maintenance and operating accidents in accordance with relevant regulations, it is also necessary to design and configure fast-acting pressure relief structure, once an internal arcing fault occurs. In addition to strictly ensuring the manufacturing quality of the switchgear and performing correct maintenance and operation in accordance with relevant regulations, it is also necessary to design and configure a fast-acting pressure relief structure. Once an internal arcing fault occurs, it can quickly guide the energy release and maximize the protection of equipment and personnel. Hurt.

At present, in the medium voltage switchgear industry, the following two pressure relief structure modes are usually adopted: the first mode is to open a rectangular pressure relief port on the top plate of the cabinet body, and install a flat pressure relief cover above the pressure relief port. One end is fixed with a metal bolt, and the other end is fixed with a nylon screw. The flat pressure relief cover of this pressure relief mode is fitted and fixed on the pressure relief port. When an arcing fault occurs inside the switchgear, the flat pressure relief cover needs to be forcibly impacted. The pressure relief channel can only be opened if it is deformed, and the area of the opening of the channel is limited, and the arcing fault energy inside the switchgear cannot be discharged to the outside of the switchgear in time, posing a safety hazard.

The second mode is to open a rectangular pressure relief port on the top plate of the cabinet, and a pressure relief plate is provided above the hole. The pressure relief plate is box-shaped. The pressure relief plate includes a maintaining connection part and a pressure relief connection part. It is fixed on the cabinet body to prevent the pressure relief plate from flying out and causing damage to personnel or equipment. The connection part can be hinged on the top plate of the cabinet body through hinges. Release the fixation with the cabinet and open the pressure relief port for pressure relief. Usually, the pressure relief connection part is fixed on the cabinet body through nylon screws and other low-strength connectors. The pressure relief connection part can also be fixed to the pressure relief port through a weak connection part. along. When an arcing fault occurs inside the switchgear of this pressure relief mode, under normal circumstances, the arcing energy can break the nylon screw of the pressure relief connection part, the pressure relief plate rotates around the hinge point of the hinge, and the pressure relief port is fully opened for pressure relief For example, a Chinese patent with the authorization announcement number CN205944772 and the authorization announcement date of 2017.02.08 discloses a switchgear pressure relief mechanism, including a cover plate and a hinge, and the left side of the cover plate is hinged at the window on the top of the cabinet. The right side of the cover plate is fixed to the cabinet body through low-strength connectors, wherein the cover plate constitutes a pressure relief plate, and the part on the left side of the cover plate used to connect with the hinge of the cabinet body constitutes the maintaining connection part of the pressure relief plate, and the right side of the cover plate The part used to connect with the cabinet body through the low-strength connector constitutes the pressure relief connection part of the pressure relief plate. When arcing inside the switchgear, the cover plate of the pressure relief mechanism of the switchgear can be flipped along the hinge to achieve the purpose of pressure relief. However, when the impact force received by the pressure relief plate cover is greater than the fixing strength of the hinge, the hinge will be broken, causing the entire pressure relief plate to fly out before the rotation occurs, posing a safety hazard.

Contents of the invention

The purpose of the present invention is to provide a switchgear pressure relief structure to solve the problem of safety hazards in the current pressure relief structure; in addition, the purpose of the present invention is to provide a switchgear using the above pressure relief structure.

In order to achieve the above object, the technical solution of the switchgear of the present invention is: the switchgear includes a cabinet body, the cabinet body is provided with a pressure relief port, the pressure relief port is provided with a pressure relief plate, and the pressure relief plate has a pressure relief connection part and a In order to keep the pressure relief plate always connected to the connection part of the cabinet, the pressure relief port is provided with a turnable cover on the side of the pressure relief plate facing the pressure relief port to block the side of the pressure relief port close to the connection part. or the pressure relief port is provided with a guide plate on the side of the pressure relief plate facing the pressure relief port; or the distance between the pressure relief connecting portion and the pressure relief port is smaller than the distance between the maintaining connection portion and the pressure relief port so that the pressure relief port is arranged eccentrically with respect to the pressure relief plate.

The pressure relief plate includes a body facing the pressure relief port and a bent portion connected to the body. The pressure relief structure also includes a support fixed on the cabinet, and the support and the pressure relief plate enclose an opening facing the pressure relief port. The pressure relief box, the retaining connection part is arranged on the bending part, the pressure relief connection part is arranged on the body, the pressure relief connection part is fixed on the support, and the retaining connection part is connected to the cabinet body.

The connecting part is hinged on the cabinet body.

The baffle plate is suspended from the pressure relief port, or the baffle plate includes a baffle plate holding connection part that is always fixed at the pressure relief port and a baffle plate pressure relief connection part that is released after being impacted by arc energy.

The baffle plate or guide plate is fixed on the edge of the pressure relief opening at a position close to the holding connection part.

The technical solution of the pressure relief structure of the switchgear of the present invention is: the pressure relief structure of the switchgear includes a pressure relief plate arranged at the pressure relief port, the pressure relief plate has a pressure relief connection part and is used to connect the pressure relief plate to the cabinet all the time. The connection part on the body, the pressure relief structure of the switchgear also includes a foldable shielding plate arranged at the pressure relief port to shield the side of the pressure relief port close to the connection part; or the switchgear The pressure relief structure also includes a guide plate for setting at the pressure relief port, and the guide plate is provided with a guide surface for guiding the arc energy in the cabinet to the pressure relief plate away from the area of the holding connection part; the shielding plate or the guide plate is in A pressure relief plate is used on the side facing the pressure relief port.

The pressure relief plate includes a body facing the pressure relief port and a bent portion connected to the body, the pressure relief structure also includes a support for fixing on the cabinet body, and the pressure relief connection part is fixed on the support Above, the support member and the pressure relief plate enclose an opening for the pressure relief box facing the pressure relief port, the holding connection part is arranged on the bending part, and the pressure relief connection part is arranged on the body.

The connecting part is provided with a hinged structure for hinged on the cabinet body.

The pressure relief structure of the switchgear includes the pressure relief port, and the baffle plate is used to hang over the pressure relief port, or the baffle plate includes a baffle plate holding connection part and Shutter pressure relief connection for release after exposure to arcing energy impact.

The pressure relief structure of the switch cabinet includes the pressure relief port, and the shielding plate or guide plate is fixed at a position close to the holding connection part along the pressure relief port.

The beneficial effect of the present invention is: when the pressure relief port of the switchgear body of the present invention is provided with a baffle plate, the baffle plate is located on the side of the pressure relief plate facing the pressure relief port and forms a shield on the side of the pressure relief port close to the holding connection part , when an arcing fault occurs in the cabinet, the arcing energy in the cabinet rushes to the pressure relief port, and the side of the pressure relief port close to the connection part of the pressure relief plate is blocked by the shielding plate, so that the pressure relief port is far away from the connection part One side is impacted first, the pressure relief connection part of the pressure relief plate is unfixed after being impacted by the arc energy, the side of the pressure relief port close to the pressure relief connection part is opened first, and the pressure relief plate opens the pressure relief port under the impact of the arc energy , and at the same time, the foldable baffle plate is folded under the impact of arc energy, so that the pressure relief port is fully opened. Due to the protective effect of the baffle plate, the arc energy first impacts the area of the pressure relief plate away from the connection part, which can reduce the impact force on the connection part of the pressure relief plate and prevent the connection part of the pressure relief plate from being broken, which solves the problem of the current switch There are potential safety hazards in the pressure relief structure of the cabinet.

When a guide plate is provided at the pressure relief port of the switchgear body of the present invention, the guide plate is located on the side of the pressure relief plate facing the pressure relief port. When an arcing fault occurs in the cabinet, the arcing energy in the cabinet rushes towards the pressure relief port. , the guide surface on the guide plate can guide the energy rushing out of the pressure relief port to the area away from the holding connection part, reduce the impact force on the holding connection part, and ensure that the holding connection part will not be broken, which solves the problem of the current switchgear There are potential safety hazards in the pressure relief structure.

The distance between the pressure relief connection part and the pressure relief port of the switch cabinet body of the present invention is smaller than the distance between the connection part and the pressure relief port so that when the pressure relief port is arranged eccentrically with respect to the pressure relief plate, the arc energy acts on the pressure relief plate The force point is far away from the maintaining connection part, and will not have a large impact on the maintaining connection part, which also ensures that the maintaining connection part will not be broken, and solves the safety hazard of the current pressure relief structure of the switchgear question.

Furthermore, the pressure relief connection part is arranged on the body facing the pressure relief port, and the holding connection part is provided on the bending part. After the arc energy rushes out of the pressure relief port, it first impacts the pressure relief connection part on the body. Under the action of other conditions, it is further ensured that the pressure relief connection part is broken first to protect the connection part.

Further, the baffle plate or guide plate is fixed on the edge of the pressure relief opening close to the position of the holding connection part, the baffle plate or guide plate is fixed on the edge of the pressure relief opening to facilitate processing, and it is arranged on the edge of the pressure relief opening close to the holding connection part The location then ensures that the arcing energy is directed away from the retaining connection when the arcing energy impacts the shield or guide plate.

Description of drawings

Fig. 1 is the structural representation of the pressure relief structure of the specific embodiment 1 of switchgear of the present invention;

Fig. 2 is a schematic diagram of the state after the pressure relief port of the specific embodiment 1 of the switchgear of the present invention is opened;

Fig. 3 is the local structure schematic diagram of the specific embodiment 1 of switchgear of the present invention;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is a top view of the top of the cable chamber in Fig. 4 after the pressure relief plate is removed;

Fig. 6 is a top view of the pressure relief plate in Fig. 1;

Fig. 7 is the front view of Fig. 6;

Fig. 8 is a structural schematic diagram of the pressure relief structure of the specific embodiment 2 of the switchgear of the present invention;

Fig. 9 is a top view of the cabinet top plate of the specific embodiment 5 of the switch cabinet of the present invention;

Fig. 10 is a cross-sectional view of the top plate along A-A in Fig. 9;

Fig. 11 is a schematic diagram of the state of the shading plate in Fig. 9 after being folded;

Fig. 12 is a top view of the top plate of the switch cabinet according to Embodiment 6 of the present invention.

detailed description

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

Specific embodiment 1 of the lighting cabinet of the present invention, as shown in Figures 1 to 7, the switch cabinet includes a cabinet body 1, and the cabinet body 1 includes a circuit breaker room 13, a bus room 14, and a cable room 15 arranged front and back, wherein the circuit breaker The tops of the chamber 13, the busbar chamber 14 and the cable chamber 15 are all equipped with pressure relief structures. The pressure relief structure includes a cabinet top plate 1 and a pressure relief port 11 arranged on the top plate 1. The pressure relief structure also includes a pressure relief plate 2 and a support member 3 arranged at the pressure relief port 11. The pressure relief plate 2 has a holding connection portion 21 and Pressure relief connection part 22.

The pressure relief plate 2 is L-shaped. The pressure relief plate 2 includes a body 23 facing the pressure relief port 11 and a bent portion 24 connected to the body. The retaining connection portion 21 is arranged on the bent portion 24, and the pressure relief connection portion 22 is arranged on the body. , the pressure relief connection part 22 is fixed on the support member 3, and the holding connection part 21 is fixed on the cabinet body. As shown in FIG. 7 , in this embodiment, both the body 23 and the bent portion 22 have flanges that are turned toward the pressure relief port. In this embodiment, the pressure relief port 11 is square. In order to improve the protection level of the switch cabinet, in this embodiment, the support member 3 is composed of three U-shaped plates, and the three U-shaped plates are arranged at the pressure relief port and connected with the pressure relief port. The pressure plate surrounds the pressure relief box with the opening facing the cabinet body, and the opening of the U-shaped plate forming the support 3 faces outside the pressure relief box. Considering the sealing protection level of the switchgear, when the support member 3 is installed in conjunction with the pressure relief plate 2, the support member 3 is located inside the flange of the pressure relief plate 2, and the U-shaped plate connected to the pressure relief connection part of the pressure relief plate through nylon screws is located on the pressure relief plate Below, the pressure relief plate and the support are installed on the top of the switch cabinet to meet the IP4X switch cabinet protection level requirements.

The connecting part 21 is hinged on the top plate 1 of the cabinet through a hinge 4 . The pressure relief connection part 22 is fixed on the support by nylon screws 4, and the support 3 is welded and fixed on the top plate 1 of the cabinet. In this embodiment, the pressure relief plate 2 adopts the form of one-sided overlapping, and nylon screws are arranged on the side of the pressure relief plate 2 opposite to the part that maintains the connection.

In this embodiment, the cabinet body also includes a guide plate 12 arranged on the edge of the pressure relief port 11, and the guide plate 12 is inclined from the edge of the pressure relief port to the center of the pressure relief port in the direction from the inside to the outside of the cabinet body, guiding The plate 12 has a guide surface 121 facing the pressure relief port for guiding the arcing energy in the cabinet to the pressure relief plate away from the connecting part. The guide surface 121 releases pressure from the pressure relief port along the direction from the inside to the outside of the cabinet. Mouth center oblique. The guide plate 12 extends into the inner cavity of the pressure relief box, and the inner cavity of the pressure relief box constitutes an accommodating cavity on the pressure relief structure for accommodating the guide plate protruding from the cabinet. The pressure relief box increases the insulation distance of the main busbar in the busbar room, provides a larger design margin for the cabinet body, and makes the overall performance of the switchgear more superior.

When arcing occurs inside the switchgear of the present invention, the arcing energy is released from the pressure relief port. Under the guidance of the guide plate, the arcing energy is guided to the area on the pressure relief plate away from the holding connection part, and the pressure relief connection part After the nylon screw is punched off, the fixation with the support is released, the pressure relief connection part can rotate around the hinge point on the connection part, and the pressure relief port is opened for pressure relief. In addition, under the impact of arc burning energy, the guide plate deforms , the guide plate is inclined to the radial side of the pressure relief port to fully open the pressure relief port for maximum pressure relief.

The switchgear of the present invention can quickly open the pressure relief passage, and by adopting the hinged pressure relief plate, the opening angle of the pressure relief plate can reach 180 degrees, and the pressure relief passage can be opened in all directions. By setting the guide surface to guide the arcing energy, the force generated by the arcing energy is concentrated on the pressure relief connection part, so that the force on the hinge is very small, which completely guarantees the safety and reliability of the entire pressure relief process, and at the same time ensures The pressure relief plate can start quickly after arcing occurs in the cabinet.

The specific embodiment 2 of the switchgear of the present invention, the difference between the switchgear in this embodiment and the switchgear described in the specific embodiment 1 of the above-mentioned switchgear is only that: as shown in Figure 8, in this embodiment, the leakage The pressing structure includes a guide part 6, the guide part 6 includes a fixed part 61 and a guide plate 62 fixed on the top plate of the cabinet, the fixed part 61 and the hinge 204 are all fixed on the top plate 201 of the cabinet, and the guide surface 2121 is arranged on the guide plate 62 Above, the structure of the guide plate 62 is the same as that of the guide plate described in the specific embodiment of the above-mentioned switchgear, and will not be repeated here.

The specific embodiment 3 of the switchgear of the present invention, the difference between the switchgear in this embodiment and the specific embodiment 2 of the above-mentioned switchgear is only that a hinge shaft is provided on the guide part, and the pressure relief plate is directly hinged on the hinge shaft of the guide part superior.

The specific embodiment 4 of the switch cabinet of the present invention, the difference between the switch cabinet in this embodiment and the specific embodiment 1 of the above-mentioned switch cabinet is only that the pressure relief plate of the pressure relief structure in this embodiment is a flat plate, and the top plate of the cabinet body A groove is provided, the pressure relief port is arranged in the groove, the guide plate is also arranged in the groove, and the pressure relief plate covers the notch of the groove.

The specific embodiment 5 of the switch cabinet of the present invention, the difference between the switch cabinet in this embodiment and the specific embodiment 1 of the above-mentioned switch cabinet is only that: as shown in Figures 9 to 11, the pressure relief port 511 in this embodiment There is a foldable shielding plate 512 on the side of the pressure relief plate facing the pressure relief port to form a shield on the side of the pressure relief port close to the holding connection part. The foldable shielding plate 512 can Fold over. The shielding plate 512 is integrated with the top plate 51 , and the shielding plate 512 is suspended from the pressure relief port 511 . When arcing occurs inside the cabinet, the arcing energy in the cabinet rushes to the pressure relief port, and the side of the pressure relief port close to the holding connection part of the pressure relief plate is blocked by the shielding plate, so that the arcing energy first impacts the pressure relief plate away from the holding On one side of the connecting part, the pressure relief plate is unfixed under the impact of the arcing energy, and then the shielding plate at the pressure relief port is folded under the impact of the arcing energy, and the pressure relief port is fully opened. The shading plate can make the arcing energy impact the area away from the holding connection part at first, so as to prevent the connection holding part from being broken. In other embodiments, the pressure relief plate can be a flat plate. At this time, the shielding plate and the pressure relief plate are arranged adjacent to each other. When the pressure is released, the shielding plate and the pressure relief plate are turned up almost at the same time. Under this concept, the pressure relief plate can be kept close to each other. Nylon screws with slightly stronger strength are arranged in some areas to reduce the impact force on the connection part of the pressure relief plate.

The specific embodiment 6 of the switch cabinet of the present invention, the difference between the switch cabinet in this embodiment and the specific embodiment 5 of the above-mentioned switch cabinet is only that: as shown in Figure 12, the shielding plate 6012 includes The shading plate retains the connecting part 6014 and the shading plate pressure relief connecting part 6015 that is released after being impacted by the arc energy. There is a connecting rib 6013 between the shading pressure relief connecting part 6015 and the top plate 601 of the cabinet body. , the connecting ribs can be broken. In other embodiments, the portion between two adjacent connecting ribs may not be a through hole, but may be a weak connection portion formed by other structures such as grooves.

When arcing occurs inside the cabinet, the arcing energy in the cabinet rushes to the pressure relief port, and the side of the pressure relief port close to the holding connection part of the pressure relief plate is blocked by the shielding plate, so that the arcing energy first impacts the pressure relief plate away from the holding On one side of the connecting part, the pressure relief plate is unfixed under the impact of the arcing energy, and then the shielding plate at the pressure relief port is punched off under the impact of the arcing energy to block the The plate is folded toward the outside of the switch cabinet, and the pressure relief port is fully opened. The shading plate can make the arcing energy impact the area away from the holding connection part at first, so as to prevent the connection holding part from being broken.

The specific embodiment 7 of the switchgear of the present invention, the difference between the switchgear in this embodiment and the specific embodiment 1 of the above-mentioned switchgear is only that: in this embodiment, the distance between the pressure relief connection part and the pressure relief port is less than that of the connection The distance between the pressure relief port and the pressure relief port is such that the pressure relief port is arranged eccentrically relative to the pressure relief plate, and the distance between the pressure relief port and the connection part is relatively long. was dashed.

Specific embodiment 1 of the pressure relief structure of the switchgear of the present invention, the pressure relief structure of the switchgear in this embodiment is the same as the structure of the pressure relief structure described in any one of the specific embodiments 1-7 of the above-mentioned switchgear, I won't go into details.

The specific embodiment 2 of the pressure relief structure of the switchgear of the present invention, the difference between the pressure relief structure of the switchgear in this embodiment and the structure described in the specific embodiment 1 of the pressure relief structure of the switchgear above is only that: in this embodiment The pressure relief structure does not include the top plate and the pressure relief port arranged on the top plate.

In other embodiments of the switchgear and its pressure relief structure of the present invention, the above-mentioned pressure relief connection part can also be fixed on the support by other low-strength connectors such as low-strength metal screws, and the above-mentioned connection part may not be provided with a low-strength connector. The connector can be provided with a fixing hole, and the pressure relief connection part can be directly fixed on the support through the fixing bolt, and a fracture groove is provided within the circumference of the fixing hole, so that the pressure relief connection part can break from the fracture groove when it is impacted. After the breakage, the fixing holes and fixing bolts originally on the connecting part are kept on the support, and the remaining part rotates around the hinge point keeping the connecting part.

The above-mentioned supporting member may not be provided. At this time, the pressure relief plate as a whole is in the shape of a box with an opening towards the cabinet body. The connecting parts can all be connected with the cabinet body. At this time, the edge of the pressure relief port on the top surface of the cabinet body is provided with a boss, which is equivalent to the integrated arrangement of the support member and the cabinet body; the above-mentioned pressure relief structure can also be arranged on the cabinet body The specific position can be determined according to the actual use needs of the cabinet; the above-mentioned guide surface can also be a guide arc surface, of course, the guide surface can also be a guide step surface, and the guide step surface can have at least one step; the above-mentioned pressure relief plate When it is an L-shaped plate, the holding connection part and the pressure relief connection part can be arranged on two adjacent surfaces of the cabinet body; the above-mentioned supporting parts can also be other components such as supporting blocks or I-beams.

The above shielding plate may not be integrated with the top plate of the cabinet, and the shielding plate may be fixed on the top plate, and the top plate and the shielding plate are fixed together by bolts or welding, using a similar structure in the specific embodiment 2 of the switch cabinet.

In other embodiments, the connecting part of the above-mentioned pressure relief plate can be fixed on the top plate by stainless steel bolts or the pressure relief plate is integrated with the top plate of the cabinet, and the connecting part and the top plate are integrally structured, and the connecting part of the pressure relief plate can be welded and fixed on top plate.

The above-mentioned pressure relief structure can also be arranged on the rear side or bottom of the cabinet body, and can also be arranged on the left and right sides of the switch cabinet if the requirements are met.

The above-mentioned pressure relief box can be surrounded by the body of the pressure relief plate and the bending part arranged on the body. At this time, there are bending parts around the body of the pressure relief plate, and the bending part and the body form a pressure relief box with an opening facing the pressure relief port. At this time, the holding connection part and the pressure relief connecting part of the pressure relief plate are all arranged on the bending part; The part can be arranged on one side of the support member. At this time, the pressure relief plate can also not be provided with a bending part. The pressure relief plate is a flat plate structure, and the holding connection part and the pressure relief connection part of the pressure relief plate are connected to the support member.

Claims (10)

1. switch cubicle, including cabinet, cabinet, which is provided with pressure relief opening, pressure relief opening, is provided with pressure relief plate, and the pressure relief plate, which has, to be let out Press coupling part and the holding coupling part for making pressure relief plate be connected to all the time on cabinet, it is characterised in that：The pressure relief opening Place be provided with pressure relief plate towards pressure relief opening side be used for pressure relief opening close to keep coupling part side formed block can The shutter of turnover；Or be provided with the pressure relief opening in directing plate of the pressure relief plate towards pressure relief opening side, the directing plate Being provided with is used to keep the subregional guide surface of connecting portion by remote on arcing energy drag pressure relief plate in cabinet；Or pressure release connects Socket part point and the distance of pressure relief opening are less than the distance for keeping coupling part and pressure relief opening so that pressure relief opening is relative to pressure relief plate bias Arrangement.

2. switch cubicle according to claim 1, it is characterised in that：The pressure relief plate include towards pressure relief opening body and with The kink of body connection, the pressure relief also includes the support member being fixed on cabinet, and the support member encloses with pressure relief plate Into opening towards the pressure release box of pressure relief opening, the holding coupling part is arranged on kink, and the pressure release coupling part is set On body, pressure release coupling part is fixed on support member, keeps coupling part to be connected on cabinet.

3. switch cubicle according to claim 1 or 2, it is characterised in that：The holding coupling part is hinged on cabinet.

4. switch cubicle according to claim 1 or 2, it is characterised in that：The shutter overhangs at pressure relief opening, Huo Zhesuo The shutter that stating shutter includes being fixed on all the time at pressure relief opening keeps connecting portion and releases solid after being impacted by arcing energy Fixed shutter pressure release connecting portion.

5. switch cubicle according to claim 1 or 2, it is characterised in that：The shutter or directing plate are fixed on pressure release Close to the position for keeping coupling part in mouth opening's edge.

6. pressure release structure for switch cabinet, including the pressure relief plate for being arranged at pressure relief opening, the pressure relief plate have pressure release connecting portion Divide and the holding coupling part for making pressure relief plate be connected to all the time on cabinet, it is characterised in that：The pressure release structure for switch cabinet Also include being used to be arranged on and pressure relief opening foldable is blocked close to keep the side of coupling part to be formed blocking at pressure relief opening Plate；Or the pressure release structure for switch cabinet also includes being used for being arranged on directing plate at pressure relief opening, directing plate is provided with that be used for will Away from the holding subregional guide surface of connecting portion on arcing energy drag pressure relief plate in cabinet；At the shutter or directing plate It is used in pressure relief plate towards the side of pressure relief opening.

7. pressure release structure for switch cabinet according to claim 6, it is characterised in that：The pressure relief plate includes being used for towards pressure relief opening Body and the kink that is connected with body, the pressure relief also includes the support member for being used to be fixed on cabinet, described to let out Pressure coupling part is fixed on support member, and the support member surrounds opening with pressure relief plate is used for the pressure release box towards pressure relief opening, institute State holding coupling part to be arranged on kink, the pressure release coupling part is arranged on body.

8. the pressure release structure for switch cabinet according to claim 6 or 7, it is characterised in that：The holding coupling part is provided with use In the articulated structure being hinged on cabinet.

9. the pressure release structure for switch cabinet according to claim 6 or 7, it is characterised in that：The pressure release structure for switch cabinet includes institute Pressure relief opening is stated, the shutter is used to overhang at pressure relief opening, or the shutter includes being used to be fixed on pressure relief opening all the time The shutter at place keeps connecting portion and for releasing fixed shutter pressure release connecting portion after being impacted by arcing energy.

10. the pressure release structure for switch cabinet according to claim 6 or 7, it is characterised in that：The pressure release structure for switch cabinet includes institute Pressure relief opening is stated, the shutter or directing plate are fixed on pressure relief opening opening's edge close to the position for keeping coupling part.