CN220233829U - Pressure relief device of high-voltage switch cabinet - Google Patents

Abstract

The utility model discloses a pressure relief device of a high-voltage switch cabinet, which comprises a switch cabinet main body, wherein a pressure relief cavity is formed in the switch cabinet main body, an opening edge is fixedly connected to the outside of the switch cabinet main body, and the pressure relief device further comprises: the shielding mechanism is fixedly connected to the upper end part of the switch cabinet main body; the auxiliary supporting mechanism is fixedly connected to the top of the shielding mechanism and is used for assisting the movement of the shielding mechanism; the magnetic attraction mechanism is arranged in the opening edge and the shielding mechanism. This high tension switchgear pressure relief device makes the explosion-proof apron open and shut more stable through the cooperation motion of first movable rod and second movable rod and spring, can not cause the damage of explosion-proof apron when making atmospheric pressure dash the explosion-proof apron under the effect of spring, has prolonged the life of explosion-proof apron like this, has guaranteed the explosion-proof apron and has met department with the top of mouth edge through the suction of magnetic path when explosion-proof apron and mouth edge contact simultaneously, and need not be spare parts such as copper screw and fix, make things convenient for apron multiple closure use like this.

Description

Pressure relief device of high-voltage switch cabinet

Technical Field

The utility model relates to the field of high-voltage switch cabinets, in particular to a pressure relief device of a high-voltage switch cabinet.

Background

The high-voltage switch cabinet is used for generating, transmitting, distributing, converting and consuming electric energy in a power system, and has the functions of on-off, control or protection, and the like, and in the running process of the switch cabinet, circuit short-circuit faults occur due to various reasons (such as short circuit, insulation aging, manual operation errors, and the like), high-temperature and high-pressure gas is instantaneously generated under the short-circuit current of tens of amperes, and then the pressure is necessarily released through a channel in the pressure release cavity, or the adjacent switch cabinet is possibly damaged;

the prior Chinese patent publication number is: CN203277969U provides a modified high tension switchgear pressure relief device, including the high tension switchgear pressure relief device casing, be provided with the relief vent on the high tension switchgear pressure relief device casing, cover a blasting board on the high tension switchgear pressure relief device casing relief vent, the upper end of blasting board passes through the hinge to be fixed at high tension switchgear pressure relief device casing upside, and the lower extreme of blasting board passes through plastic screw to be fixed at high tension switchgear pressure relief device casing downside. By adopting the device, when the pressure relief device of the high-voltage switch cabinet increases the air pressure due to failure, the rupture disc bears the pressure, the plastic screw at the lower end is firstly broken due to lower strength, the rupture plate rotates along the hinge rotating shaft under the action of the pressure to leak out the pressure relief opening, and the pressure is relieved, because the upper end of the rupture plate is fixed at the upper side of the shell of the pressure relief device of the high-voltage switch cabinet through the hinge, the rupture plate cannot fly out, thereby ensuring the safety of personnel and other equipment; the utility model has simple structure, convenient installation, economy and practicability;

the above-mentioned pressure relief device is when using, though the upper end of blasting board passes through the hinge to be fixed at high tension switchgear pressure relief device casing upside, the blasting board can not fly out to guarantee personnel and other equipment's safety, but still have some problems below when using: the other end of foretell blasting board passes through plastic screw and installs the downside at the pressure relief device casing, can lead to the fact the damage to plastic screw when the pressure of below dashes out like this, leads to the unable closure of explosion-proof board, needs follow-up manual work to change, and is comparatively inconvenient, and can lead to the fact the damage of explosion-proof board because of the collision when the pressure is opened to the explosion-proof board, influences secondary use.

Therefore, it is necessary to invent a pressure relief device for a high voltage switchgear to solve the above-mentioned problems.

Disclosure of Invention

The utility model aims to provide a pressure relief device for a high-voltage switch cabinet, which is used for solving the problems that the other end of the explosion plate provided in the background art is arranged on the lower side of a shell of the pressure relief device through a plastic screw, so that the plastic screw is damaged when the pressure below the explosion plate is punched out, the explosion plate cannot be closed and needs to be replaced by subsequent manual work, the explosion plate is inconvenient, and the explosion plate is possibly damaged due to collision when the explosion plate is opened by the pressure, and the secondary use is influenced.

In order to achieve the above object, the present utility model provides the following technical solutions: the utility model provides a high tension switchgear pressure relief device, includes the cubical switchboard main part, the pressure release chamber has been seted up to the inside of cubical switchboard main part, and the outside fixedly connected with mouth edge of cubical switchboard main part still includes:

the shielding mechanism is fixedly connected to the upper end part of the switch cabinet main body;

the auxiliary supporting mechanism is fixedly connected to the top of the shielding mechanism and is used for assisting the movement of the shielding mechanism;

the magnetic attraction mechanism is arranged in the opening edge and the shielding mechanism.

Preferably, the pressure release cavity is arranged in the switch cabinet main body;

the guide plates are fixedly connected to the inner walls of the two sides of the pressure release cavity at the left end and the right end, the lower ends of the guide plates are fixedly connected to the bottom of the pressure release cavity, and the two surfaces of the guide plates are arc-shaped and used for shunting air pressure.

Preferably, the shielding mechanism includes:

the bottom ends of the four fixing plates are fixedly connected to the top of the switch cabinet main body, and each two fixing plates are symmetrically arranged on two sides of the opening edge;

the end parts of the first fixed shafts are fixedly connected with the inner walls of the two groups of two symmetrically arranged fixed plates respectively, and the first fixed shafts are positioned above the opening edge;

the anti-explosion cover plates are hinged to two sides of the inner wall of the two fixing plates through the first fixing shaft and are used for moving the anti-explosion cover plates.

Preferably, the auxiliary supporting mechanism includes:

the support is arched, the bottom end of the support is fixedly connected to the top wall of the switch cabinet main body, two groups of supports are symmetrically arranged on the left and right, and the two groups of supports are correspondingly arranged on the outer sides of the two groups of fixing plates;

the two side walls of the fixed block are fixedly connected with the end parts of the two groups of bracket transverse rods respectively;

the sliding groove is square and is arranged in the fixed block;

the two ends of the supporting rod are fixedly connected with the upper side wall and the lower side wall in the sliding groove respectively, and the surface of the supporting rod is smooth;

the connecting block I is internally provided with a through hole for the supporting rod to move and is movably connected with the supporting rod, and a notch is formed in the connecting block I;

two end parts of the second fixed shaft are fixedly connected to the inner walls of two sides of the notch in the first connecting block;

the movable part is hinged to the outer part of the first connecting block through the second fixing shaft and is used for assisting the operation of the movable part.

The bottom end of the second connecting block is fixedly connected to the outer wall of the explosion-proof cover plate, and a notch for the movable part to rotate is formed in the second connecting block;

the fixed shaft III is fixedly connected with two side walls of the notch in the connecting block II at two ends, and the bottom end of the movable part is hinged to the outer part of the connecting block II through the fixed shaft III and used for moving the movable part.

Preferably, the movable part consists of a first movable rod, a second movable rod, a movable groove and a spring;

the inner top end of the first movable rod is provided with a through hole slightly larger than the diameter of the second fixed shaft, and the first movable rod is hinged to the outer part of the first connecting block through the second fixed shaft;

the bottom end of the inner part of the second movable rod is provided with a through hole slightly larger than the diameter of the fixed shaft III, and the second movable rod is hinged to the outer part of the connecting block II through the fixed shaft III;

the movable groove is formed in the second movable rod, and the first movable rod is movably sleeved in the movable groove;

the spring, both ends respectively with the bottom of movable groove and the bottom fixed connection of first movable rod, the inner wall fixedly connected with attenuator of spring, and the bottom of attenuator and the bottom fixed connection of movable groove.

Preferably, the magnetic attraction mechanism includes:

the placement grooves are square and are formed in the two sides of the opening edge;

the two ends of the fixing shaft IV are fixedly connected to the inner walls of the two sides of the mounting groove, the outer part of the fixing shaft IV is sleeved with a torsion spring, and the two ends of the torsion spring are respectively fixedly connected with the inner wall of the mounting groove and the clamping block;

the cambered surface of the outer surface of the clamping block is combined with the straight surface, a through hole with the diameter slightly larger than that of the fourth fixed shaft is formed in the clamping block, and the clamping block can rotate around the fourth fixed shaft;

the poking groove is arranged at the top end of the inside of the clamping block in a round hole shape and is used for poking the clamping block;

the magnetic blocks are detachably arranged in the mounting grooves, the end faces of the two sides of the magnetic blocks are contacted with the outer walls of the two clamping blocks in the clamping state, and friction force larger than the suction force between the two magnetic blocks exists between the clamping blocks and the magnetic blocks;

the ejector rod is fixedly connected to the bottom of the clamping block, the outer end of the ejector rod is fixedly connected with a protruding block, and the protruding block can be contacted with the bottom of the magnetic block.

In the technical scheme, the utility model has the technical effects and advantages that:

1. the explosion-proof cover plate is more stable in opening and closing through the cooperation movement of the first movable rod, the second movable rod and the spring, the explosion-proof cover plate cannot be damaged due to collision between sudden stress and an external object when the explosion-proof cover plate is opened by air pressure under the action of the spring, the service life of the explosion-proof cover plate is prolonged, meanwhile, the connection position of the explosion-proof cover plate and the top of the opening edge is guaranteed through the suction force of the magnetic block when the explosion-proof cover plate is contacted with the opening edge, the opening edge is fully closed, the pressure release cavity is prevented from being exposed to the outside, and parts such as copper screws are not required to be used for fixing, so that the cover plate is conveniently closed for multiple times, and meanwhile, the plastic screws are not required to be used for manual replacement, so that the explosion-proof cover plate is more convenient;

2. the first movable rod and the second movable rod are driven to prop against the upper portion of the explosion-proof cover plate under the action of the spring pushing force and the action of the first connecting block, so that the opening and closing angle of the explosion-proof cover plate can be controlled, and meanwhile, the closing and opening movement of the explosion-proof cover plate is buffered under the action of the spring, the damper inside the spring and the like, so that the service life of the cover plate is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

FIG. 1 is a schematic view of the appearance structure provided by the present utility model;

FIG. 2 is a schematic view of a front view of a cross-section structure according to the present utility model;

FIG. 3 is a schematic diagram of an explosion-proof cover plate opening and closing structure provided by the utility model;

FIG. 4 is a schematic view of the internal structure of the edge and the pressure relief chamber according to the present utility model;

fig. 5 is a schematic diagram of the disassembly and assembly structure of the mouth rim and the magnetic attraction mechanism provided by the utility model.

Reference numerals illustrate:

1. a switch cabinet body; 2. a pressure relief cavity; 3. a deflector; 4. an opening edge; 5. a shielding mechanism; 501. a fixing plate; 502. a first fixed shaft; 503. an explosion-proof cover plate; 6. an auxiliary supporting mechanism; 601. a bracket; 602. a fixed block; 603. a chute; 604. a support rod; 605. a first connecting block; 606. a second fixed shaft; 607. a first movable lever; 608. a second movable rod; 609. a movable groove; 610. a spring; 611. a third fixed shaft; 612. a second connecting block; 7. a magnetic attraction mechanism; 701. a placement groove; 702. a fourth fixed shaft; 703. a clamping block; 704. a toggle groove; 705. a magnetic block; 706. and an ejector rod.

Detailed Description

In order to make the technical scheme of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings.

The utility model provides a high-voltage switch cabinet pressure relief device as shown in figures 1-5, which comprises a switch cabinet main body 1, wherein a pressure relief cavity 2 is formed in the switch cabinet main body 1, an opening edge 4 is fixedly connected to the outside of the switch cabinet main body 1, and the high-voltage switch cabinet pressure relief device further comprises:

the shielding mechanism 5 is fixedly connected to the upper end part of the switch cabinet main body 1;

the auxiliary supporting mechanism 6 is fixedly connected to the top of the shielding mechanism 5 and is used for assisting the movement of the shielding mechanism 5;

the magnetic attraction mechanism 7 is arranged inside the mouth edge 4 and the shielding mechanism 5.

The pressure release cavity 2 is arranged in the switch cabinet main body 1;

the guide plate 3, both ends fixed connection is in the both sides inner wall of pressure release chamber 2 about, and lower extreme fixed connection is in the bottom of pressure release chamber 2, and the both surfaces of guide plate 3 are the arc, and are used for the reposition of redundant personnel of atmospheric pressure.

The shielding mechanism 5 includes:

the bottom ends of the four fixing plates 501 are fixedly connected to the top of the switch cabinet main body 1, and each two fixing plates 501 are symmetrically arranged on two sides of the opening edge 4;

the end parts of the first fixing shafts 502 are fixedly connected with the inner walls of two groups of two symmetrically arranged fixing plates 501 respectively, and the first fixing shafts 502 are positioned above the opening edge 4;

the two explosion-proof cover plates 503 are internally provided with through holes for the first fixed shaft 502 to pass through, the two explosion-proof cover plates 503 are symmetrically distributed, and the explosion-proof cover plates 503 are hinged on two sides of the inner walls of the two fixed plates 501 through the first fixed shaft 502 and are used for moving the explosion-proof cover plates 503.

The auxiliary supporting mechanism 6 includes:

the brackets 601 are arched, the bottom ends of the brackets are fixedly connected to the top wall of the switch cabinet main body 1, two groups of brackets 601 are symmetrically arranged on the left and right, and the two groups of brackets 601 are correspondingly arranged on the outer sides of the two groups of fixing plates 501;

the two side walls of the fixed block 602 are fixedly connected with the end parts of the transverse rods of the two groups of brackets 601 respectively;

a square slide groove 603, which is formed inside the fixed block 602;

the two ends of the supporting rod 604 are fixedly connected with the upper side wall and the lower side wall inside the sliding groove 603 respectively, and the surface of the supporting rod 604 is smooth;

the first connecting block 605 is internally provided with a through hole for the supporting rod 604 to move and is movably connected with the supporting rod 604, and the first connecting block 605 is internally provided with a notch;

the second fixing shaft 606, the two ends of which are fixedly connected with the inner walls of the two sides of the notch in the first connecting block 605;

the movable part is hinged to the outer part of the first connecting block 605 through a second fixing shaft 606 and is used for assisting the operation of the movable part.

The second connecting block 612, the bottom end of which is fixedly connected to the outer wall of the explosion-proof cover plate 503, and a notch for the movable part to rotate is formed in the second connecting block 612;

the third fixing shaft 611 is fixedly connected to two side walls of the notch in the second connecting block 612 at two ends, and the bottom end of the movable part is hinged to the outer part of the second connecting block 612 through the third fixing shaft 611 and is used for moving the movable part.

The movable part consists of a first movable rod 607, a second movable rod 608, a movable groove 609 and a spring 610;

the first movable rod 607, the inner top end of which is provided with a through hole slightly larger than the diameter of the second fixed shaft 606, the first movable rod 607 is hinged to the outer part of the first connecting block 605 through the second fixed shaft 606;

the second movable rod 608 is provided with a through hole slightly larger than the diameter of the third fixed shaft 611 at the bottom end of the inner part, and the second movable rod 608 is hinged to the outer part of the second connecting block 612 through the third fixed shaft 611;

the movable slot 609 is arranged inside the second movable rod 608, and the first movable rod 607 is movably sleeved inside the movable slot 609;

the bottom of the movable slot 609 and the bottom of the first movable rod 607 are fixedly connected with two ends of the spring 610 respectively, the inner wall of the spring 610 is fixedly connected with a damper, and the bottom of the damper is fixedly connected with the bottom of the movable slot 609, so that the following movement of the spring 610 is stable.

The magnetic attraction mechanism 7 includes:

the placement groove 701 is square and is arranged in the two sides of the opening edge 4;

the fourth fixed shaft 702 is fixedly connected with the inner walls of the two sides of the mounting groove 701 at the two ends, the torsion spring is sleeved outside the fourth fixed shaft 702, and the two ends of the torsion spring are fixedly connected with the inner wall of the mounting groove 701 and the clamping block 703 respectively, so that the clamping block 703 can move conveniently;

the clamping block 703, the cambered surface of the outer surface is combined with the straight surface, a through hole with the diameter slightly larger than that of the fourth fixed shaft 702 is formed in the clamping block 703, and the clamping block 703 can rotate around the fourth fixed shaft 702;

the poking groove 704 is formed in a round hole shape at the top end of the inside of the clamping block 703 and is used for poking the clamping block 703, and a notch is formed so as to facilitate subsequent poking;

the magnetic blocks 705 are detachably arranged in the mounting grooves 701, the end surfaces of the two sides of the magnetic blocks 705 are contacted with the outer walls of the two clamping blocks 703 in the clamping state, and a friction force larger than the suction force between the two magnetic blocks 705 exists between the clamping blocks 703 and the magnetic blocks 705;

the ejector rod 706 is fixedly connected to the bottom of the clamping block 703, a bump is fixedly connected to the outer end of the ejector rod 706, and the bump can be contacted with the bottom of the magnetic block 705, so that convenience is brought to the process of taking out the magnetic block 705.

Working principle: when the pressure release device of the high-voltage switch cabinet is used, firstly, when the pressure release is needed, the air pressure is released through the inside of the pressure release cavity 2, the air pressure is divided into two parts by the guide plate 3, the air pressure is released from the cavity openings of the pressure release cavities 2 on the left side and the right side respectively, at the moment, the left explosion-proof cover plate 503 and the right explosion-proof cover plate 503 are pushed to rotate around the first fixed shaft 502 respectively, when the explosion-proof cover plate 503 rotates, the connecting block two 612 fixedly connected with the top wall of the explosion-proof cover plate 503 is driven to move, and the bottom end of the second movable rod 608 is hinged to the outside of the connecting block two 612 through the third fixed shaft 611, so that when the connecting block two 612 rotates, the second movable rod 608 is driven to rotate around the third fixed shaft 611 and move upwards, at the moment, a spring 610 connected in the movable groove 609 connected with the inside of the second movable rod 608 is pushed by the upward force, the first movable rod 607 is pushed to move upwards in the movable groove 609 through the second fixed shaft 606, the top end of the first movable rod 607 is hinged to the outside of the connecting block one 605, at the same time, the first 605 can slide outside of the supporting rod 605 can slide on the outside of the supporting rod 604 through the second fixed shaft 606, the inside of the connecting rod 605 can move in the sliding groove 603, the inside the sliding groove 603 is pushed by the first movable rod 605, the pressure is pushed to move upwards, and the pressure of the inner wall of the first movable rod 605 is pushed to move inside the inner wall of the connecting rod 605 is pushed to move upwards, and the pressure is pressed on the inside the inner side of the connecting rod 605 is pressed, and the pressure release device is pressed, and the pressure release device is pressed and the pressure is pressed down in the inside the pressure release device is pressed, and is released. When the spring 610 loses the action force from bottom to top after the release is finished, the reset motion starts at this moment, because the action of the damper in the spring 610 makes the movement of the spring 610 more stable, and meanwhile, the explosion-proof cover plate 503, the first movable rod 607 and the second movable rod 608 are the same as the above operation steps, the reset motion starts, and further the explosion-proof cover plate 503 is driven to turn over the top of the opening edge 4, at the moment, the first connecting block 605 slides downwards outside the supporting rod 604, and the initial state is restored, so that the second movable rod 608 is pushed by the pushing force of the spring 610 to push the upper end of the explosion-proof cover plate 503, the explosion-proof cover plate 503 is tightly attached to the top of the opening edge 4, the pressure release cavity 2 is closed, meanwhile, the magnetic block 705 in the explosion-proof cover plate 503 is attracted with the magnetic block 705 in the opening edge 4, the closing of the explosion-proof cover plate 503 is ensured more, the magnetic force of the magnetic block 705 is not good after the service time is longer, and the replacement may be needed, at this time, only the fingers are placed in the poking grooves 704 and poke the two clamping blocks 703 towards opposite directions respectively, so that the clamping blocks 703 are driven to rotate and simultaneously force the torsion springs sleeved on the outer platforms of the four fixed shafts 702 to deform, meanwhile, in the moving process of the clamping blocks 703, the ejector rods 706 connected with the clamping blocks 703 are also driven to move, and further, the protruding blocks fixedly connected with the outer parts of the ejector rods 706 eject the magnetic blocks 705, so that the magnetic blocks 705 can be replaced, the service life of the closing mechanism is prolonged, when the magnetic blocks 705 are required to be installed, the magnetic blocks 705 are only required to be poked after the clamping blocks 703 are arranged in the middle of the two clamping blocks 703, the clamping blocks 703 are released, at this time, the two sides of the magnetic blocks 705 are clamped by the fact that the torsion springs start to reset after losing the force, and the friction force between the magnetic blocks 705 and the clamping blocks 705 is larger than the magnetic attraction between the two magnetic blocks 705, therefore, the magnet 705 is attached to and separated from the inside of the placement groove 701, and the stability of magnetic attraction and closing is ensured.

While certain exemplary embodiments of the present utility model have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the utility model, which is defined by the appended claims.

Claims (6)

1. The utility model provides a high tension switchgear pressure relief device, includes switch cabinet main part (1), pressure release chamber (2) have been seted up to the inside of switch cabinet main part (1), and the outside fixedly connected with mouth edge (4) of switch cabinet main part (1), its characterized in that: further comprises:

the shielding mechanism (5) is fixedly connected to the upper end part of the switch cabinet main body (1);

the auxiliary supporting mechanism (6) is fixedly connected to the top of the shielding mechanism (5) and is used for assisting the movement of the shielding mechanism (5);

the magnetic attraction mechanism (7) is arranged in the opening edge (4) and the shielding mechanism (5).

2. The high voltage switchgear pressure relief device of claim 1 wherein: the pressure release cavity (2) is arranged in the switch cabinet main body (1);

the left end and the right end of the guide plate (3) are fixedly connected to the inner walls of the two sides of the pressure release cavity (2), the lower end of the guide plate is fixedly connected to the bottom of the pressure release cavity (2), and the two surfaces of the guide plate (3) are arc-shaped and used for air pressure split.

3. The high voltage switchgear pressure relief device of claim 1 wherein: the shielding mechanism (5) comprises:

the bottom ends of the four fixing plates (501) are fixedly connected to the top of the switch cabinet main body (1), and each two fixing plates (501) are symmetrically arranged on two sides of the opening edge (4);

the end parts of the first fixing shafts (502) are fixedly connected with the inner walls of two groups of two symmetrically arranged fixing plates (501) respectively, and the first fixing shafts (502) are positioned above the opening edge (4);

the two explosion-proof cover plates (503) are internally provided with through holes for the first fixed shaft (502) to pass through, the two explosion-proof cover plates (503) are symmetrically distributed, and the explosion-proof cover plates (503) are hinged to the two sides of the inner wall of the two fixed plates (501) through the first fixed shaft (502) and are used for the movement of the explosion-proof cover plates (503).

4. The high voltage switchgear pressure relief device of claim 1 wherein: the auxiliary support mechanism (6) comprises:

the brackets (601) are arched, the bottom ends of the brackets are fixedly connected to the top wall of the switch cabinet main body (1), two groups of brackets are symmetrically arranged on the left and right, and the two groups of brackets (601) are correspondingly arranged on the outer sides of the two groups of fixing plates (501);

the two side walls of the fixed block (602) are fixedly connected with the end parts of the transverse rods of the two groups of brackets (601) respectively;

the sliding groove (603) is square and is arranged in the fixed block (602);

the two ends of the supporting rod (604) are fixedly connected with the upper side wall and the lower side wall in the sliding groove (603) respectively, and the surface of the supporting rod (604) is smooth;

the first connecting block (605) is internally provided with a through hole for the supporting rod (604) to move and is movably connected with the supporting rod (604), and the first connecting block (605) is internally provided with a notch;

the second fixed shaft (606) is fixedly connected with the inner walls of the two sides of the inner notch of the first connecting block (605) at the two ends;

the movable part is hinged to the outside of the first connecting block (605) through a second fixed shaft (606) and is used for assisting the operation of the movable part;

the bottom end of the second connecting block (612) is fixedly connected to the outer wall of the explosion-proof cover plate (503), and a notch for the movable part to rotate is formed in the second connecting block (612);

the fixed shaft III (611) is fixedly connected with two end parts of the fixed shaft III (611) at two side walls of the notch in the connecting block II (612), and the bottom end of the movable part is hinged to the outer part of the connecting block II (612) through the fixed shaft III (611) and is used for the movement of the movable part.

5. The high voltage switchgear pressure relief device according to claim 4, wherein: the movable part consists of a first movable rod (607), a second movable rod (608), a movable groove (609) and a spring (610);

the first movable rod (607) is provided with a through hole with the diameter slightly larger than that of the second fixed shaft (606), and the first movable rod (607) is hinged to the outer part of the first connecting block (605) through the second fixed shaft (606);

the bottom end of the inner part of the second movable rod (608) is provided with a through hole slightly larger than the diameter of the third fixed shaft (611), and the second movable rod (608) is hinged to the outer part of the second connecting block (612) through the third fixed shaft (611);

the movable groove (609) is formed in the second movable rod (608), and the first movable rod (607) is movably sleeved in the movable groove (609);

the spring (610), both ends respectively with the bottom of movable groove (609) and the bottom fixed connection of first movable rod (607), the inner wall fixedly connected with attenuator of spring (610), and the bottom of attenuator and the bottom fixed connection of movable groove (609).

6. The high voltage switchgear pressure relief device of claim 1 wherein: the magnetic attraction mechanism (7) comprises:

the placement groove (701) is square and is arranged in the two sides of the opening edge (4);

the four fixing shafts (702) are fixedly connected to the inner walls of the two sides of the mounting groove (701), the torsion springs are sleeved outside the four fixing shafts (702), and the two ends of the torsion springs are respectively fixedly connected with the inner wall of the mounting groove (701) and the clamping blocks (703);

the clamping block (703), the cambered surface of the outer surface is combined with the straight surface, a through hole with the diameter slightly larger than that of the fourth fixed shaft (702) is formed in the clamping block (703), and the clamping block (703) can rotate around the fourth fixed shaft (702);

the poking groove (704) is formed in a round hole shape at the inner top end of the clamping block (703) and is used for poking the clamping block (703);

the magnetic blocks (705) are detachably arranged in the mounting grooves (701), two side end surfaces of the magnetic blocks (705) are contacted with the outer walls of the two clamping blocks (703) in a clamping state, and a friction force larger than the suction force between the two magnetic blocks (705) exists between the clamping blocks (703) and the magnetic blocks (705);

the ejector rod (706) is fixedly connected to the bottom of the clamping block (703), the outer end of the ejector rod (706) is fixedly connected with a bump, and the bump can be contacted with the bottom of the magnetic block (705).