CN220400426U

CN220400426U - Full-sealed plastic shell operating mechanism of switch cabinet

Info

Publication number: CN220400426U
Application number: CN202122328370.6U
Authority: CN
Inventors: 伍燕生; 廖长寿; 高克勤
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-25
Filing date: 2021-09-25
Publication date: 2024-01-26
Anticipated expiration: 2031-09-25

Abstract

The utility model relates to a full-sealed plastic shell operating mechanism of a switch cabinet, which comprises a back plate and a plastic shell, wherein the shell is fixed on the back plate and is in sealing fit with the back plate, and a sealing installation cavity is formed between the shell and the back plate. By adopting the scheme, the utility model provides the full-sealed plastic shell operating mechanism of the switch cabinet, which reduces the influence of the working environment on the internal elements, so that the operating mechanism can be ensured to run reliably for a long time.

Description

Full-sealed plastic shell operating mechanism of switch cabinet

Technical Field

The utility model relates to the field of switch cabinets, in particular to a full-sealed plastic shell operating mechanism of a switch cabinet.

Background

The main function of the switch cabinet is to open and close, control and protect electric equipment in the process of generating, transmitting, distributing and converting electric energy of the electric power system. The components in the switch cabinet mainly comprise a breaker, a disconnecting switch, a load switch, an operating mechanism, a mutual inductor, various protection devices and the like.

Along with the development of social progress and the improvement of technical strength, the requirements of the switch cabinet are gradually improved, such as reliability, maintenance-free, intelligentization, internet of things, environmental protection and the like, the functions are required to be based on the stable operation of the switch cabinet, the stable operation of the switch cabinet depends on good performance of internal elements, but the operating mechanisms of the switch cabinet in the market are exposed outside, and once the switch cabinet is applied to a wet environment or coastal corrosion environment, the performances of electroplated parts and electric elements are definitely greatly influenced, so that the function operation is hindered and the service period of products is seriously reduced.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model aims to provide the full-sealed plastic shell operating mechanism of the switch cabinet, which reduces the influence of the working environment on internal elements, so as to ensure the long-time and reliable operation of the operating mechanism.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the novel plastic back plate comprises a back plate and a plastic cover shell, wherein the cover shell is fixed on the back plate and is in sealing fit with the back plate, and a sealing installation cavity is formed between the cover shell and the back plate.

Through adopting above-mentioned technical scheme, form sealed installation cavity by housing and backplate, reduce external influence to operating mechanism is inside to make operating mechanism can long-time steady operation, simultaneously, select plastics as the material of housing, relative metal, more easily process complex structure, can reduce the processing degree of difficulty, avoid metal deformation to sealed influence, reduce cost etc. that causes in the course of the work.

The utility model is further provided with: the housing comprises a middle housing and a front housing, wherein the middle housing surrounds the sealing installation cavity and is fixed between the back plate and the front housing, the front end of the middle housing is in sealing fit with the front housing, and the rear end of the middle housing is in sealing fit with the back plate.

Through adopting above-mentioned technical scheme, divide into well shell and front shroud with the housing, reduce the processing degree of difficulty, only need take off the front shroud when assembly and debugging can, reduce assembly and debugging degree of difficulty, improve assembly and debugging efficiency, simultaneously, also reduced the backplate of plastics material and the structure complexity of front shroud, reduced the processing degree of difficulty promptly.

The utility model is further provided with: the sealing installation cavity in rotate and be provided with the transmission shaft, the transmission shaft including be located the transmission main part of front shroud and with front shroud pivoted seal complex transmission rotor, transmission rotor one end be located the sealing installation cavity and with transmission main part grafting linkage, the other end be located the front shroud the place ahead and with transmission main part's torque output or with torque input to transmission main part.

Through adopting above-mentioned technical scheme, set up the transmission rotor of transmission moment of torsion on the front shroud, on the one hand, directly stretch out the front shroud and the activity is sealed relative transmission shaft, and the assembly of this kind of structure is more convenient, on the other hand, by the mode linkage of pegging graft, autosegregation when the front shroud is detached, resumes the linkage when installing the front shroud, makes the debugging process of dismantling the front shroud repeatedly more high-efficient, convenient.

The utility model is further provided with: the socket is characterized by further comprising a socket, wherein the side face of the front cover is provided with a plug-in platform, the plug-in platform is provided with a socket mounting hole, the socket stretches out from the inner side of the front cover, passes through the socket mounting hole to the front of the plug-in platform and is in sealing fit with the socket mounting hole, the socket is electrically connected with an external element through an element in a plug-in sealing mounting cavity, the socket is provided with a fixed disc propped against the inner side of the front cover, the outer side of the front cover is provided with a threaded piece which passes through the front cover and fixes the fixed disc with the front cover, and the front end face of the plug-in platform is positioned behind the front end face of the front cover.

Through adopting above-mentioned technical scheme, be provided with the grafting platform of socket, form totally closed electricity connected environment, reduce the wire and directly stretch out the sealed degree of difficulty that the housing brought, simultaneously, because the socket is connected with the wire of being connected with internal component, rotatory screw thread spare can make its and front shroud separation, avoid hindering assembly and debugging because of the socket, in addition, rational utilization side space and make grafting platform preceding terminal surface be located front shroud preceding terminal surface rear, make the structure compacter.

The utility model is further provided with: the front end and the rear end of the middle shell are respectively provided with a sealing groove consistent with the outline and a sealing ring matched with the shape of the sealing groove.

By adopting the technical scheme, the sealing ring with the same outline as the middle shell has more comprehensive sealing effect.

The utility model is further provided with: the housing is provided with an air charging connector for vacuumizing the sealed installation cavity and introducing dry air or dry nitrogen.

By adopting the technical scheme, the inflatable connector is additionally arranged, a dry environment is formed in the sealing installation cavity, and the occurrence of rusting of internal elements is further avoided.

The utility model is further provided with: the sealing installation cavity in rotate and be provided with the output shaft, the backplate be provided with backplate pivoted seal complex output rotor, output rotor one end be located the sealing installation cavity and peg graft the linkage with the output shaft, the other end is located the backplate outside and exports the moment of torsion of transmission shaft to the gas tank in.

Through adopting above-mentioned technical scheme, output torque output to the gas tank with the output shaft by the output rotor, with the structure that the output shaft components of a whole that can function independently set up make the assembly more convenient.

The utility model is further provided with: still include button buckler, buckler fixed cover and fixation nut, sealed installation chamber be provided with the button that stretches out from the housing front end face, the housing front end be provided with the button hole that supplies the button to stretch out, the button buckler be the elasticity material, the button buckler be located the housing outside and cover in the button hole, the button buckler be provided with the hem of inwards bending, the buckler fixed cover pass in the button hole and encircle the button, the buckler fixed cover be provided with the extrusion piece that extrudees the hem to the housing and form button buckler and housing fixed fit, fixation nut be located the housing and with the fixed cover periphery screw-thread fit of buckler, constitute the fixed cooperation of buckler fixed cover and housing.

Through adopting above-mentioned technical scheme, button buckler can prevent that dust or steam from getting into sealed installation intracavity from the clearance department in button and button hole, simultaneously, form button buckler and the fixed cooperation of housing when the hem by the fixed cover of buckler extrusion button buckler, make the mounting structure of the fixed cover of buckler more stable, in addition, fixation nut is located the housing and constitutes the fixed cooperation of the fixed cover of buckler and housing with the fixed cover periphery screw thread cooperation of the fixed cover of buckler, moreover, when sealing performance reduces, accessible screw fixation nut compensates, the sealed duration in sealed installation chamber of extension.

The utility model is further provided with: the circuit breaker operation mechanism is characterized by further comprising two circuit breaker operation mechanisms and two isolation operation mechanisms, wherein the number of the back plates is one or corresponds to the number of the back plates one by one, and the back plates and the different cover plates form sealing installation cavities for installing the circuit breaker operation mechanisms or the isolation operation mechanisms respectively.

Through adopting above-mentioned technical scheme, the quantity of backplate be one or with the housing one-to-one, can select according to the demand, two independent sealed installation chambeies, guarantee to install circuit breaker operating mechanism or keep apart operating mechanism can not influence performance and seal each other.

The utility model is further provided with: the circuit breaker operating mechanism comprises an electromagnet, a circuit breaker control shaft and a transition plate, wherein the circuit breaker control shaft is rotationally arranged in the sealing installation cavity, the transition plate is rotationally arranged in the sealing installation cavity and located between the electromagnet and the circuit breaker control shaft, the circuit breaker control shaft is provided with a pressure receiving plate which is driven to rotate when being extruded, the electromagnet is electrified to extrude one end of the transition plate, and the other end of the transition plate is extruded to the pressure receiving plate. By adopting the technical proposal, the utility model has the advantages that,

through adopting above-mentioned technical scheme, because the electro-magnet has certain volume, by the driving force transmission of transition board with the electro-magnet to the circuit breaker control axle, adjustable electro-magnet position makes the housing structure more regular more when making the structure more compact to other positions in the sealed installation chamber, easier processing.

Drawings

FIG. 1 is a perspective view of an embodiment of the present utility model;

FIG. 2 is a perspective view of a middle shell in an embodiment of the utility model;

FIG. 3 is a perspective view of a front cover in accordance with an embodiment of the present utility model;

FIG. 4 is an exploded view of the front housing and the receptacle according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a structure of a transmission shaft according to an embodiment of the present utility model;

FIG. 6 is a schematic view of the structure of an output shaft according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a button according to an embodiment of the present utility model;

fig. 8 is a partial schematic view of the interior of the circuit breaker operating mechanism in accordance with an embodiment of the present utility model;

FIG. 9 is a perspective view of a button in accordance with an embodiment of the present utility model;

FIG. 10 is a perspective view of an interlock structure in accordance with an embodiment of the present utility model;

fig. 11 is a schematic structural view of a grounding operation shaft according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1, the utility model discloses a full-sealed plastic shell operating mechanism of a switch cabinet, which comprises a back plate 1 and a shell 2 made of plastic, wherein the back plate 1 is generally fixed on an air box of the switch cabinet, the shell 2 is fixed on the back plate 1 and is in sealing fit with the back plate 1, a sealing installation cavity is formed between the shell 2 and the back plate 1, wherein the shell 2 comprises a middle shell 21 and a front shell 22, the middle shell 21 surrounds the sealing installation cavity and is fixed between the back plate 1 and the front shell 22, the front end of the middle shell 21 is in sealing fit with the front shell 22, the rear end of the middle shell is in sealing fit with the back plate 1, the number of the back plate 1 is one or corresponds to the shell 2 one by one, in particular embodiments, the number of the back plate 1 is two, the back plate 1 and different shells 2 form the sealing installation cavity respectively used for installing a breaker operating mechanism 3 or isolating operating mechanism 4, the shell 2 is provided with a breakable area 23, the mounting part is broken when needed, and in addition, the shell is provided with an air charging joint 13 used for vacuumizing the sealing installation cavity and introducing dry air or dry nitrogen.

As shown in fig. 2, the front end and the rear end of the middle shell 21 are respectively provided with a sealing groove 211 with a consistent contour and a sealing ring 212 with a shape matched with the sealing groove 211, and as shown in fig. 3, the front cover 22 is integrally provided with a convex ring 221 with a shape consistent with the sealing groove 211 and pressing the sealing ring 212.

As shown in fig. 4, the socket 24 is generally an aviation socket and accords with the IP67 grade, the side surface of the front cover 22 is provided with a plugging platform 222, the plugging platform 222 is provided with a socket mounting hole 223, the socket 24 extends from the inner side of the front cover 22 to the front of the plugging platform 222 and is in sealing fit with the socket mounting hole 223, the socket 24 is electrically connected with external elements through elements in a sealing mounting cavity formed by plugs, the socket 24 is provided with a fixing disc 241 propped against the inner side of the front cover 22, the outer side of the front cover 22 is provided with a threaded piece 224 penetrating through the front cover 22 and fixing the fixing disc 241 with the front cover 22, the threaded piece 224 is generally a bolt, and the front end surface of the plugging platform 222 is positioned behind the front end surface of the front cover 22.

As shown in fig. 1, the transmission shaft of the circuit breaker operating mechanism 3 includes a circuit breaker indicating shaft 31, an energy storage shaft 32, a gear shaft 33, and the like, the transmission shaft of the isolation operating mechanism 4 includes an isolation indicating shaft 41, an isolation operating shaft 42, and a grounding operating shaft 43, as shown in fig. 5, with the circuit breaker indicating shaft 31 being exemplified, the transmission shaft includes a transmission main body 311 located in the front cover 22 and a transmission rotating body 312 in rotary sealing fit with the front cover 22, one end of the transmission rotating body 312 is located in the sealing installation cavity and is in plug-in linkage with the transmission main body 311, the other end is located in front of the front cover and outputs torque of the transmission main body 311 or inputs torque to the transmission main body 311, and the rotary sealing is generally realized by a skeleton seal ring.

The circuit breaker operating mechanism 3 and the isolation operating mechanism 4 are both provided with an output shaft 34 which is output to the air box, the output shaft 34 comprises an output rotating body 342 which is positioned in the backboard 1 and is in rotary sealing fit with the backboard 1, one end of the output rotating body 342 is positioned in a sealing installation cavity and is in plug-in linkage with the output main body 341, the other end of the output rotating body 342 is positioned outside the backboard 1 and outputs torque of the output main body 341 to the air box, the rotary sealing is generally realized by a framework sealing ring, in addition, the backboard 1 is further provided with a rotating seat 11 for installing the output rotating body 342, the rotating seat 11 is in sealing fit with the inner side wall of the backboard 1, the rotating seat 11 is provided with a rotating sleeve 111, and in order to enable the output shaft 34 to be accurately aligned with the air box, and a positioning ring 12 surrounding the output shaft 34 is fixedly arranged outside the backboard 1.

The button of the circuit breaker operating mechanism 3 includes a closing button 35 and an opening button 36, as shown in fig. 7, taking the closing button 35 as an example, and further includes a button waterproof cover 351, a waterproof cover fixing sleeve 352 and a fixing nut 353, wherein the front end of the housing 2 is provided with a button hole 225 for the closing button 35 to extend out, the button waterproof cover 351 is made of elastic material, the button waterproof cover 351 is located at the outer side of the housing 2 and covers the button hole 25, the button waterproof cover 351 is provided with a folded edge 3511 bent inwards, the waterproof cover fixing sleeve 352 penetrates through the button hole 25 and surrounds the closing button 35, the waterproof cover fixing sleeve 352 is provided with an extrusion block 3521 for extruding the folded edge 3511 towards the housing 2 to form the button waterproof cover 351 to be fixedly matched with the housing 2, and the fixing nut 353 is located in the housing 2 and is in threaded fit with the outer periphery of the waterproof cover fixing sleeve 352 to form the fixing sleeve 352 to be fixedly matched with the housing 2.

The waterproof and dustproof structure is combined, so that the operating mechanism accords with the IP65 level.

As shown in fig. 8, in order to make the structure more compact, the circuit breaker operating mechanism 3 includes a closing electromagnet 37, a circuit breaker control shaft 32 and a transition plate 38, the circuit breaker control shaft 32 is rotatably disposed in a seal mounting cavity, the transition plate 38 is rotatably disposed in the seal mounting cavity and between the closing electromagnet 37 and the circuit breaker control shaft 32, the circuit breaker control shaft 32 is provided with a pressure receiving plate 321 which drives the circuit breaker control shaft to rotate when being pressed, one end of the closing electromagnet 37 is electrically pressed to press the transition plate 38, the other end of the transition plate 38 presses the pressure receiving plate 321, meanwhile, the seal mounting cavity is slidably provided with a sliding plate 39 disposed behind the transition plate 38, the closing button 35 is provided with an operation protrusion 351, the sliding plate 39 is provided with a roller 391 which abuts against the operation protrusion 351, the arc surface of the operation protrusion 351 presses the roller 391, so that the sliding plate 39 slides to press the pressure receiving plate 321, the function of driving the circuit breaker control shaft 32 to rotate is also realized, and the structure is more compact, in addition, the other end of the pressure receiving plate 321 extends to the interlocking plate 352 is limited by the interlocking electromagnet 30, and the interlocking plate 352 is released from the interlocking plate 30 only when the other circuit breaker operating mechanism of the operating mechanism is disconnected from the operation mechanism. In order to make the wire arrangement in the housing 2 more regular, a wire guide plate 26 for guiding and fixing the guide is provided, a middle plate 27 and a front plate 28 for mounting components are provided in the housing 2, the wire guide plate 26 is positioned in the middle plate 27, and a closing electromagnet 37 and a transition plate 38 are positioned in the front plate 28.

As shown in fig. 9, taking the closing button 35 as an example, a guide rod 354 matched with the sliding button is arranged below the closing button 35, a U-shaped guide block 355 is arranged on the lateral side of the button in an outward extending mode, a bolt 356 matched with the guide rod 354 is arranged in the U-shaped guide block 355, the head of the bolt 356 slides in the U-shaped guide block 355, and the assembly structure is simplified and meanwhile the sliding is stable.

As shown in fig. 1, in order to clearly express the operating state of the circuit breaker operating mechanism 3, the circuit breaker indicating shaft 31 and the isolation indicating shaft 41 are disposed outside the housing 2, and the outer side wall of the housing 2 is provided with a scale 226 corresponding to the pointer and disposed on the housing 22.

In order to ensure the safety of the isolation operation and avoid electric starting during manual operation, when the handle is sleeved on the isolation operation shaft 42, the micro switch 421 close to the isolation operation shaft 42 is triggered by the handle in a squeezing way, so that the electric driving part is powered off.

As shown in fig. 10, in order to secure the safety of the overall operation, there is also an interlock structure, i.e., a first interlock lever 51 and a second interlock lever 52, the first interlock lever 51 and the second interlock lever 52 move linearly between the two housings 2, the circuit breaker indication shaft 31 is provided with a circuit breaker cam 314 rotating synchronously, the isolation operation shaft 42 is provided with an isolation cam 422 rotating synchronously, the first interlock lever 51 is provided with a first tension spring 511 for resetting it toward the circuit breaker cam 314, the housing 2 is provided with a first guide post 512 for guiding the first interlock lever 51, the first tension spring 511 is fixed between the first guide post 512 and the first interlock lever 51, the second interlock lever 52 is provided with a second tension spring 521 for resetting it toward the circuit breaker cam 314, the housing 2 is provided with a second guide post 522 for guiding the second interlock lever 52, the second tension spring 521 is fixed between the first guide post 522 and the first interlock lever 51, when the circuit breaker is in the off state, the small radius position of the circuit breaker cam 314 is abutted against the first interlock lever 51, the first interlock lever 51 is made to be in the large radius position of the isolation operation shaft 42 is abutted against the second interlock button 52, and the second interlock button 52 is made to be located against the second interlock button 52; when the isolating operation shaft 42 is rotated to close the isolating switch, the small radius position of the isolating cam 422 is abutted against the second interlocking lever 52, so that the second interlocking lever 52 is staggered at the position of the closing button 35; when the closing button 35 is pressed, the large radius position of the circuit breaker cam 314 is abutted against the first interlocking rod 51 when the circuit breaker is closed, so that the first interlocking rod 51 is blocked on the isolation operation shaft 42; when the release button 36 is pressed, the small radius position of the breaker cam 314 abuts against the first interlock lever 51, causing the first interlock lever 51 to be misplaced from the isolation operation shaft 42.

As shown in fig. 11, the lock case 2 is provided with a spring support shaft 29, the ground operation shaft 43 is provided with a ground driving plate 431 which swings when rotating, the ground driving plate 431 is eccentrically provided with a driving shaft 432, a driving spring 291 is arranged between the spring support shaft 29 and the driving shaft 432, the spring support shaft 29 is provided with a first matching plate 292 extending into the driving spring 291, the ground driving plate 431 is provided with two second matching plates 433 extending into the driving spring 291, a guide cavity 434 which is matched with the first matching plate 292 in shape and is used for the first matching plate 292 to stretch is arranged between the two second matching plates 433, when the ground operation shaft 43 is operated to the middle position, the total length of the first matching plate 292 and the second matching plate 433 is shortest, the compression degree of the driving spring 291 is the greatest, and a matching plate which is matched with the spring support shaft 29 in a sliding way is arranged relative to the spring support shaft 29.

Claims

1. A full-sealed plastic shell operating mechanism of a switch cabinet is characterized in that: including backplate and plastics material's housing, the housing be fixed in the backplate and with backplate sealing fit, housing and backplate between form sealed installation cavity, the housing include well shell and front shroud, well shell around sealed installation cavity and be fixed in between backplate and the front shroud, well shell front end and front shroud sealing fit, rear end and backplate sealing fit, sealed installation cavity in rotate and be provided with the transmission shaft, the transmission shaft including be located the front shroud the transmission main part and with front shroud rotation sealing fit's transmission rotor, transmission rotor one end be located sealed installation cavity and with transmission main part grafting linkage, the other end be located the front shroud the place ahead and with transmission main part's torque output or with torque input to transmission main part.

2. The switch cabinet fully-sealed plastic-housing operating mechanism according to claim 1, wherein: the socket is characterized by further comprising a socket, wherein the side face of the front cover is provided with a plug-in platform, the plug-in platform is provided with a socket mounting hole, the socket stretches out from the inner side of the front cover, passes through the socket mounting hole to the front of the plug-in platform and is in sealing fit with the socket mounting hole, the socket is electrically connected with an external element through an element in a plug-in sealing mounting cavity, the socket is provided with a fixed disc propped against the inner side of the front cover, the outer side of the front cover is provided with a threaded piece which passes through the front cover and fixes the fixed disc with the front cover, and the front end face of the plug-in platform is positioned behind the front end face of the front cover.

3. The switch cabinet fully-sealed plastic-housing operating mechanism according to claim 1, wherein: the front end and the rear end of the middle shell are respectively provided with a sealing groove consistent with the outline and a sealing ring matched with the shape of the sealing groove.

4. The switch cabinet fully-sealed plastic-housing operating mechanism according to claim 1, wherein: the housing is provided with an air charging connector for vacuumizing the sealed installation cavity and introducing dry air or dry nitrogen.

5. The switch cabinet fully-sealed plastic-housing operating mechanism according to claim 1, wherein: the output shaft comprises an output main body positioned in the back plate and an output rotating body in rotary sealing fit with the back plate, one end of the output rotating body is positioned in the sealing mounting cavity and is in splicing linkage with the output main body, and the other end of the output rotating body is positioned outside the back plate and outputs torque of the output main body into the air box.

6. The switch cabinet fully-sealed plastic-housing operating mechanism according to claim 1, wherein: still include button buckler, buckler fixed cover and fixation nut, sealed installation chamber be provided with the button that stretches out from the housing front end face, the housing front end be provided with the button hole that supplies the button to stretch out, the button buckler be the elasticity material, the button buckler be located the housing outside and cover in the button hole, the button buckler be provided with the hem of inwards bending, the buckler fixed cover pass in the button hole and encircle the button, the buckler fixed cover be provided with the extrusion piece that extrudees the hem to the housing and form button buckler and housing fixed fit, fixation nut be located the housing and with the fixed cover periphery screw-thread fit of buckler, constitute the fixed cooperation of buckler fixed cover and housing.

7. The switch cabinet fully-sealed plastic-housing operating mechanism according to claim 1, wherein: the circuit breaker operation mechanism is characterized by further comprising two circuit breaker operation mechanisms and two isolation operation mechanisms, wherein the number of the back plates is one or corresponds to the number of the back plates one by one, and the back plates and the different cover plates form sealing installation cavities for installing the circuit breaker operation mechanisms or the isolation operation mechanisms respectively.

8. The switch cabinet fully-sealed plastic-housing operating mechanism of claim 7, wherein: the circuit breaker operating mechanism comprises an electromagnet, a circuit breaker control shaft and a transition plate, wherein the circuit breaker control shaft is rotationally arranged in the sealing installation cavity, the transition plate is rotationally arranged in the sealing installation cavity and located between the electromagnet and the circuit breaker control shaft, the circuit breaker control shaft is provided with a pressure receiving plate which is driven to rotate when being extruded, the electromagnet is electrified to extrude one end of the transition plate, and the other end of the transition plate is extruded to the pressure receiving plate.