CN212277090U

CN212277090U - Manual switch and overcurrent protection mechanism of vacuum circuit breaker

Info

Publication number: CN212277090U
Application number: CN202021853744.5U
Authority: CN
Inventors: 陈刚
Original assignee: Sichuan Etherbas Technology Development Co ltd
Current assignee: Sichuan Etherbas Technology Development Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-01-01
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a vacuum circuit breaker's hand switch and overcurrent protection mechanism, the handle is installed on the handle seat, the handle seat is installed on the mount and can be rotatory, handle return spring makes the handle have by the stress of on-state to off-state, it includes first couple and second couple to take off the couple subassembly, can support spacing formation transient stable state structure each other between first couple and the second couple, the through-hole pore wall of ring gear that can rotate is equipped with convex section and is equipped with the internal tooth in this convex section, the fixed suit of arbor gear is in the pivot, the arbor gear is connected through the internal tooth meshing of self external tooth and ring gear, the subassembly that triggers that can rotate is installed on the mount and with first couple swivelling joint. The utility model discloses to have the ring gear of internal tooth and realize associative connection structure as essential element and handle, adopt the pivot as the driving piece, its occupation space is littleer, is favorable to hand switch and overcurrent protection mechanism and whole vacuum circuit breaker's miniaturized design and accurate control.

Description

Manual switch and overcurrent protection mechanism of vacuum circuit breaker

Technical Field

The utility model relates to a vacuum circuit breaker's local structure especially relates to a vacuum circuit breaker's hand switch and overcurrent protection mechanism.

Background

The vacuum circuit breaker is also called as a vacuum switch, is a circuit breaker with a contact arranged in a vacuum cavity, is named because arc extinguishing media and insulating media in a contact gap after arc extinguishing are high vacuum, has the advantages of small volume, light weight, suitability for frequent operation and no need of maintenance for arc extinguishing compared with an air circuit breaker (also called as an air switch), and is widely applied to high-voltage and low-voltage power distribution networks successively.

The basic structure of the vacuum circuit breaker comprises a vacuum switch actuating mechanism (comprising a vacuum cavity, a moving contact, a static contact and the like), a manual switch mechanism, an overcurrent protection unhooking (namely unhooking and hooking) mechanism and an overcurrent trigger mechanism, wherein the manual switch mechanism and the overcurrent protection unhooking mechanism are connected compactly to form a manual switch and an overcurrent protection mechanism with manual switch control and overcurrent protection automatic unhooking functions; with the advanced development of intellectualization, the existing multifunctional vacuum circuit breaker (or called as an intelligent vacuum circuit breaker) can be combined with an automatic motor mechanism such as a motor, a speed reducing mechanism, a controller and the like to realize the purpose of automatically or remotely controlling the circuit breaker to be opened and closed.

The manual switch of the traditional vacuum circuit breaker and the driving piece of the overcurrent protection mechanism are generally push rods which move linearly, and the movement direction of the push rods is axial, so that more space is required to be occupied, and the miniaturization design of the whole circuit breaker is not facilitated; and if the driving piece adopts the rotating shaft and realizes the driving of the moving contact in a rotating mode, the occupied space can be well reduced, and the miniaturization design of the whole circuit breaker is facilitated.

For example, the utility model patent of patent number "ZL 201921873919.6", the utility model discloses a low pressure vacuum circuit breaker trip gear is disclosed, relate to vacuum circuit breaker technical field, including the electro-magnet, vacuum interrupter and tripping device, move in the electro-magnet control vacuum interrupter, static contact or separation and realize closing and separating brake, be equipped with tripping device between electro-magnet and the vacuum interrupter, tripping device includes a link assembly, link assembly has fold condition and relatively straight state, link assembly's fold condition and relatively straight state correspond tripping device's trip condition and lock catch state respectively, when overload or short-circuit fault appear in the circuit, link assembly in time responds to switch into fold condition so that move in the vacuum interrupter by relatively straight state, static contact separation and rapid tripping. The patent utilizes the linear motion of link assembly to drive moving contact rectilinear movement and realizes opening, closing function, has the great defect of volume.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a manual switch and overcurrent protection mechanism for a vacuum circuit breaker using a rotating shaft as a driving member to solve the above problems.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

a manual switch and overcurrent protection mechanism of a vacuum circuit breaker comprises a rotating shaft, a fixing frame, a handle seat, a handle return spring, a hook releasing component, an inner gear ring, a shaft gear and a trigger component, wherein the handle is installed on the handle seat, the handle seat is installed on the fixing frame and can rotate, two ends of the handle return spring are respectively installed on the handle seat and the fixing frame, the handle is enabled to have stress from an on state to an off state, the hook releasing component comprises a first hook and a second hook, the first hook and the second hook can mutually abut against and limit to form a temporary stable structure, a through hole wall of the inner gear ring is provided with an arc-shaped section, inner teeth are arranged on the arc-shaped section, the inner gear ring is installed on the fixing frame through a gear ring shaft and can rotate, the shaft gear is fixedly sleeved on the rotating shaft, the shaft gear is connected with the inner teeth of the inner gear ring in a meshed mode through the outer teeth of the shaft gear, the trigger assembly is installed on the fixing frame and can rotate, and the trigger assembly is connected with the first hook in a rotating mode.

Further, in order to better realize the handle control function, the automatic unhooking function, the automatic resetting function and the driving rotating shaft rotating function, the manual switch and overcurrent protection mechanism of the vacuum circuit breaker further comprises a handle connecting rod, a connecting rod push rod and an unhooking spring, wherein the first end of the handle connecting rod is rotatably connected with the handle seat, the second end of the handle connecting rod is provided with the connecting rod push rod, the axial direction of the connecting rod push rod is mutually vertical to the axial direction of the handle connecting rod, the unhooking component further comprises a hook driving block and a hook rotating frame, the first hook and the hook driving block are fixedly connected and are both arranged on the fixing frame through a hook shaft and can rotate around the hook shaft, the circumferential outer wall of the inner gear ring is provided with a section of circular arc-shaped groove, and the position of the circumferential outer wall of the inner gear ring, which is close to one end of the, the hook rotating frame is arranged on the fixed frame through a rotating frame shaft and can rotate around the rotating frame shaft, the hook rotating frame comprises a section of circular arc strip matched with the inner gear ring, the circular arc strip is arranged in the circular arc groove, the circular arc strip is fixedly connected with the second hook, the circular arc strip is provided with a circular arc strip-shaped through hole, the connecting rod push rod penetrates through the circular arc strip-shaped through hole and is simultaneously arranged in the gap of the inner gear ring and is blocked by the hole wall at one side of the circular arc strip-shaped through hole so as not to be separated from the gap of the inner gear ring, the circumferential outer wall of the inner gear ring and the hook rotating frame are respectively provided with a connecting lug, two ends of the hook releasing spring are respectively connected with the two connecting lugs, and a connecting line between the connecting lug on the inner gear ring and the gap of the inner gear ring is positioned at one, the connecting line between the two connecting lugs is located on one side of the rotating frame shaft and far away from the inner gear ring notch, the trigger assembly comprises a trigger shaft, trigger pieces and a trigger connecting rod, the trigger shaft is installed on the fixed frame and can rotate, one or more of the trigger pieces are fixedly installed on the trigger shaft respectively, and two ends of the trigger connecting rod are connected with one of the trigger pieces and the hook driving block in a rotating mode respectively.

Preferably, in order to facilitate accurate control of the rotation angle of the rotating shaft, the inner teeth on the through holes of the inner gear ring and the hole walls of the circular arc-shaped sections thereof meet the following requirements: when the inner gear ring rotates to enable the shaft gear to reach the other end from one end of the through hole of the inner gear ring, the shaft gear rotates by 160 degrees. The structure ensures that the shaft gear and the rotating shaft can be limited by the through hole of the inner gear ring when rotating at most 160 degrees, and the transitional rotation is prevented; in practical application, the rotating shaft rotates by 135 degrees generally to meet the on-off control requirements, and the rotating shaft rotates by 160 degrees to realize the excellent conductive contact effect between the moving contact and the static contact.

Preferably, the radial section of the rotating shaft is kidney-shaped in order to facilitate better transmission connection with the vacuum switch actuating mechanism.

The beneficial effects of the utility model reside in that:

the utility model discloses realize the associative connection structure with the handle as the essential element ring gear that has the internal tooth, adopt the pivot as the driving piece, and suit the internal tooth meshing of shaft gear and ring gear in the pivot, realize the rotatory rotary drive structure that drives the pivot rotation through the ring gear rotation, thereby with handle control function, automatic unhook function, the automatic reset function is integrated together jointly and with the rotary drive mode looks adaptation of pivot, can realize that the moving contact of one or more vacuum switch actuating mechanism of same pivot drive accomplishes the function of opening, close control, because the pivot realizes the drive function with the rotary mode, compare linear movement's push rod mechanism, its occupation space is littleer, be favorable to hand switch and overcurrent protection mechanism and whole vacuum circuit breaker's miniaturized design and accurate control; the connecting rod push rod, the inner gear ring notch and the arc-shaped strip-shaped through hole are matched with each other to form an important structure of an automatic unhooking structure, the handle drives the inner gear ring to rotate through the connecting rod push rod to realize an opening and closing function in normal work, the connecting rod push rod cannot be separated from the inner gear ring notch due to limitation at the moment, a first hook and a second hook are separated due to short circuit or overload, the hook rotating frame rotates to drive the connecting rod push rod to be separated from the inner gear ring notch, the unhooking spring pulls the inner gear ring to rotate to drive the rotating shaft to rotate to automatically turn off the circuit breaker, an overcurrent protection function is realized, after overcurrent faults are relieved, the handle is pushed, the connecting rod push rod drives the hook rotating frame to rotate to enable the first hook and the second hook to mutually.

Drawings

Fig. 1 is a perspective exploded view of a manual switch and an overcurrent protection mechanism of a vacuum circuit breaker before assembly;

fig. 2 is a perspective view of the vacuum circuit breaker after the connection of the manual switch and the handle of the overcurrent protection mechanism and the associated components such as the inner gear ring, and the view angle is the rear side of fig. 1;

fig. 3 is a three-dimensional exploded view of the vacuum circuit breaker according to the present invention before the manual switch and the overcurrent protection mechanism are applied to the three-way synchronous control multifunctional vacuum circuit breaker;

fig. 4 is a perspective view of the manual switch and the overcurrent protection mechanism of the vacuum circuit breaker according to the present invention, in which an actuator (not labeled in the figure), an overcurrent trigger mechanism and a motor driving device are also shown;

fig. 5 is a second perspective view of the manual switch and the overcurrent protection mechanism of the vacuum circuit breaker according to the present invention, in which an actuator (not labeled), an overcurrent trigger mechanism and a motor driving device of the vacuum circuit breaker are also shown;

fig. 6 is a third perspective view of the operating state of the manual switch and the overcurrent protection mechanism of the vacuum circuit breaker, in which an actuating mechanism (not marked in the figure), an overcurrent trigger mechanism and a motor driving device of the vacuum switch are also shown.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1 and 2, the manual switch and overcurrent protection mechanism of the vacuum circuit breaker of the present invention includes a rotating shaft 503, a fixing frame 502, a handle 501, a handle holder 505, a handle return spring 506, a hook releasing component, an annular gear 504, a shaft gear 515 and a trigger component, wherein the handle 501 is mounted on the handle holder 505, the handle holder 505 is mounted on the fixing frame 502 and can rotate, two ends of the handle return spring 506 are respectively mounted on the handle holder 505 and the fixing frame 502, and the handle 501 has a stress from an open state to a closed state, the hook releasing component includes a first hook 509 and a second hook 508, the hole wall 509 of the first hook and the second hook 508 can abut against each other to limit to form a temporary stable structure, the through hole 510 of the annular gear 504 is provided with an arc-shaped section and the arc-shaped section is provided with internal teeth (not marked in the figure), the annular gear 504 is provided with an annular gear mounting hole 525 and passes through the annular gear mounting hole 525, the inner gear ring 504 can rotate, the shaft gear 515 is fixedly sleeved on the rotating shaft 503, the shaft gear 515 is in meshed connection with the inner gear ring 504 through self outer teeth, the trigger component is installed on the fixing frame 502 and can rotate, and the trigger component is rotatably connected with the first hook 509. The rotary driving structure which drives the rotating shaft 503 to rotate through the rotation of the inner gear ring 504 is matched with the rotary driving mode of the rotating shaft 503, so that the occupied space is reduced as much as possible while the rotary driving requirement is met, and the size of the circuit breaker is reduced.

As shown in fig. 1 and fig. 2, in order to better realize the handle control function, the automatic unhooking function, the automatic reset function and the driving shaft rotation function, the manual switch and the overcurrent protection mechanism of the vacuum circuit breaker of the present invention further includes a handle link 523, a link push rod 522 and an unhooking spring 518, a first end of the handle link 523 is rotatably connected with a bump 507 on the handle holder 505, a second end of the handle link 523 is provided with the link push rod 522, an axial direction of the link push rod 522 is mutually perpendicular to an axial direction of the handle link 523, the unhooking assembly further includes a hook driving block 513 and a hook rotating frame 519, the first hook driving block 513 is fixedly connected with the hook driving block 513 and is all installed on the fixing frame 502 through the hook shaft 511 and can rotate around the hook shaft 511, a section of circular arc groove 524 is provided on a circumferential outer wall of the ring gear 504, a position on the circumferential outer wall of the ring gear 504 near one end, a rotating frame mounting hole 517 is arranged on the hook rotating frame 519, the hook rotating frame 519 penetrates through the rotating frame mounting hole 517 through a rotating frame shaft and is mounted on the fixed frame 502, the hook rotating frame 519 can rotate around the rotating frame shaft, the hook rotating frame 519 comprises a section of circular arc strip (not marked in the figure) matched with the inner gear ring 504, the circular arc strip is arranged in the circular arc groove 524 and is fixedly connected with the second hook 508, a circular arc strip through hole 526 is arranged on the circular arc strip, a connecting rod push rod 522 penetrates through the circular arc strip through hole 526 and is simultaneously arranged in the inner gear ring notch 516 and is blocked by the hole wall at one side of the circular arc strip through hole 526 so as not to be separated from the inner gear ring notch 516, connecting lugs (not marked in the figure) are respectively arranged on the circumferential outer wall of the inner gear ring 504 and the hook rotating frame 519, two ends of the unhooking spring 518 are respectively connected with the two connecting lugs, and a connecting wire Keep away from the swivel mount axle (i.e. keep away from swivel mount mounting hole 517), the line between two the connection lugs is located one side of swivel mount axle (i.e. is located one side of swivel mount mounting hole 517) and keeps away from ring gear breach 516, trigger subassembly includes trigger axle 514, trigger piece 521 and trigger link 520, trigger axle 514 installs on mount 502 and can rotate, one or more (three in the figure) trigger piece 521 respectively fixed mounting is on trigger axle 514, trigger link 520's both ends respectively with one of them trigger piece 521 and couple drive block 513 swivelling joint. In order to facilitate precise control of the rotation angle of the rotating shaft 503, the through hole 510 of the inner gear ring 504 and the inner gear on the hole wall of the circular arc section thereof meet the following requirements: when the ring gear 504 rotates such that the shaft gear 515 reaches the other end from one end of the through hole 510 of the ring gear 504, the shaft gear 515 rotates by 160 °; the through hole 510 of the inner gear ring 504 is a semicircular through hole and the inner gear is arranged on the wall of the semicircular hole; the fixed frame 6 is further provided with a limit shaft 512 for blocking the second hook 508 from limiting the rotation of the hook rotary frame 519.

As shown in fig. 1 and 2, in order to precisely control the rotation angle of the rotating shaft 503, the through hole 510 of the ring gear 504 and the internal teeth on the hole wall of the circular arc segment thereof satisfy the following requirements: when the ring gear 504 rotates such that the shaft gear 515 reaches the other end from one end of the through hole 510 of the ring gear 504, the shaft gear 515 rotates by 160 °; the through-hole 510 of the ring gear 504 is a semicircular through-hole and the internal teeth are provided on the semicircular hole wall.

As shown in fig. 1 and 2, the rotating shaft 503 has a kidney-shaped radial cross section for better driving connection with the vacuum switch actuator.

Use below with vacuum circuit breaker's hand switch and overcurrent protection mechanism are applied to three routes synchro control's multi-functional vacuum circuit breaker for the example, it is right the utility model discloses carry out the detailed description of theory of operation.

As shown in fig. 3-6, adopt vacuum circuit breaker's hand switch and overcurrent protection mechanism's three routes synchro control's multi-functional vacuum circuit breaker includes this hand switch and overcurrent protection mechanism 5, three vacuum switch actuating mechanism 2, three trigger mechanism 3, pivot return disk 71, pivot return spring 72, motor drive 8 and circuit breaker mounting bracket that overflows, and vacuum switch actuating mechanism 2 includes the vacuum cavity, install inlet wire end static contact, outlet wire end static contact and moving contact (each contact is not shown in the figure, is conventional contact) in the vacuum cavity, and the outer end of inlet wire end static contact and the outer end of outlet wire end static contact are arranged respectively outside the vacuum cavity, the moving contact of three vacuum switch actuating mechanism 2 is driven through hand switch and overcurrent protection mechanism 5's pivot 503 respectively, and the outer end of three vacuum switch actuating mechanism 2's outlet wire end static contact corresponds with three overcurrent trigger mechanism 3 respectively and is connected the back, and the back Then is connected with an electric appliance (not shown), and the manual switch and the overcurrent protection mechanism 5 are respectively correspondingly connected with the three overcurrent trigger mechanisms 3; the rotating shaft 503 passes through the driven parts of the plurality of vacuum switch actuators 2 and drives the driven parts to rotate; the two side brackets 1 and the two middle brackets 4 are connected together to form a breaker mounting frame of the whole breaker, and the shapes and the sizes of the side brackets 1 and the middle brackets 4 are determined according to requirements; a control circuit board 6 is arranged on one middle bracket 4 and used for realizing automatic control; the rotating shaft return disc 71 is sleeved on the rotating shaft 503 through a through hole of the rotating shaft return disc 71, two ends of a rotating shaft return spring 72 are respectively installed on the rotating shaft return disc 71 and the breaker mounting frame, the rotating shaft 503 is enabled to have stress from an on state to an off state, and a rotating power output end of the motor driving device 8 is connected with one end of the rotating shaft 503, so that the rotating shaft 503 is controlled by a motor to rotate to realize the on-off function, and meanwhile, the rotating shaft return disc and the control circuit board 6 are used for realizing the automatic on-off control and the remote on-off control function; the overcurrent trigger mechanism 3 comprises an overcurrent coil 32 and a trigger moving rod 31, the trigger moving rod 31 is arranged in the trigger coil 32 and can move axially when the trigger coil 32 is overcurrent, the outer ends of the outlet terminal fixed contacts of the three vacuum switch actuating mechanisms 2 are respectively connected with the overcurrent coils 32 of the three overcurrent trigger mechanisms 3 correspondingly and then connected with an electrical appliance (not shown in the figure), the trigger coil 32 and the electrical appliance form a series connection structure, the currents of the two are the same, when the electrical appliance is short-circuited or overloaded, the current of the trigger coil 32 can be suddenly and remarkably increased, so that the trigger moving rod 31 moves axially in the direction far away from the trigger coil 32, and the overcurrent trigger function is realized; three trigger pieces 521 corresponding to the three overcurrent trigger mechanisms 3 one by one are respectively and fixedly installed on the trigger shaft 514, and the three trigger pieces 521 are respectively in contact connection with one ends of the three trigger moving rods 31. Fig. 3 also shows a connecting terminal 9 for connecting the outer end of the inlet terminal fixed contact and the outer end of the outlet terminal fixed contact with external wires, respectively, which is an adaptive conventional structure.

As shown in fig. 3-6, the working principle of the present manual switch and overcurrent protection mechanism 5 in the three-way synchronously controlled multifunctional vacuum circuit breaker is as follows:

the principle of manual control of opening and closing through the handle 501: as shown in fig. 6, when the handle 501 is at the off position, the inner gear ring 504, the shaft gear 515 and the rotating shaft 503 are in the corresponding association state to disconnect the moving contact from the inlet terminal fixed contact and the outlet terminal fixed contact, and the circuit breaker is in the off state; when the circuit breaker needs to be in an open state, as shown in fig. 4, the handle 501 is pushed, the inner gear ring 504 is driven to rotate by the handle connecting rod 523 and the connecting rod push rod 522, at this time, the connecting rod push rod 522 is clamped in the inner gear ring notch 516, is limited by the hook rotating frame 519 and simultaneously moves in the arc-shaped strip-shaped through hole 526, the inner gear ring 504 rotates to drive the moving shaft gear 515 and the rotating shaft 503 to synchronously rotate until the rotating shaft 130 and the rotating shaft 160 rotate, the moving contact is driven to move towards the direction close to the fixed contact of the inlet end and the fixed contact of the outlet end, and the circuit breaker is in the open state until.

Overcurrent triggers the principle of automatic unhooking: as shown in fig. 4, when the handle 501 is in the open position, the inner gear ring 504 has rotated a certain angle (clockwise rotation in fig. 4), so that the unhooking spring 518 is in a stretched state, and has a contraction stress, and the contraction stress makes the hooking rotating frame 519 have a tendency of clockwise rotation, but since the second hook 508 and the first hook 509 are buckled with each other, the second hook 508 and the hooking rotating frame 519 are blocked from rotating, and a transient state structure of the open state is maintained; when an electrical appliance is short-circuited or overloaded, the current of one or more trigger coils 32 is instantly and significantly increased, which causes the corresponding trigger rod 31 to move away from the trigger coil 32, so that the trigger piece 521 rotates, the hook driving block 513 and the first hook 509 synchronously rotate through the trigger link 520, the first hook 509 and the second hook 508 are separated from each other, the second hook 508 and the hook rotating frame 519 lose the blocking of the first hook 509, under the action of the shrinkage stress of the unhooking spring 518, the hook rotating frame 519 rotates clockwise, and the link push rod 522 is brought out of the inner gear ring notch 516, as shown in fig. 5, due to the loss of the limitation of the link push rod 522, under the action of the shrinkage stress of the unhooking spring 518, the inner gear ring 504 rotates counterclockwise, the shaft gear 515 and the rotating shaft 503 correspondingly rotate, the movable contact is disconnected from the stationary contact at the inlet end and the stationary contact at the outlet end, and the circuit breaker is in an off, the overcurrent protection function of overcurrent triggering automatic unhooking is realized.

The principle of the handle 501 self-return: after automatic unhooking, under the action of the handle return spring 506, the handle 501 rotates to return to the closed position automatically, the hook rotating frame 519 and the second hook 508 are driven to rotate anticlockwise through the handle connecting rod 523 and the connecting rod push rod 522 until the connecting rod push rod 522 slides into the inner gear ring notch 516, and at the moment, the handle 501 finishes automatic returning; meanwhile, if the overcurrent fault is relieved, the current of the trigger coil 32 returns to normal, the trigger rod 31 resets, the trigger piece 521 rotates reversely and resets (can reset under the self-weight, and can also be additionally provided with a reset spring to reset, both the trigger rod and the reset spring are of a conventional structure), the trigger connecting rod 520 enables the hook driving block 513 and the first hook 509 to synchronously rotate reversely, the first hook 509 and the second hook 508 are correspondingly buckled with each other, the automatic hook function is realized, as shown in fig. 6, the whole circuit breaker returns to the initial state of the closed state, and preparation is made for next circuit breaker opening.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.

Claims

1. The utility model provides a vacuum circuit breaker's hand switch and overcurrent protection mechanism which characterized in that: the handle is installed on the handle seat, the handle seat is installed on the fixing frame and can rotate, two ends of the handle return spring are respectively installed on the handle seat and the fixing frame and enable the handle to have stress from an on state to an off state, the hook releasing assembly comprises a first hook and a second hook, the first hook and the second hook can mutually abut against each other and limit to form a temporary stable structure, a through hole wall of the inner gear ring is provided with a circular arc section, inner teeth are arranged on the circular arc section, the inner gear ring is installed on the fixing frame through a gear ring shaft and can rotate, the shaft gear is fixedly sleeved on the rotating shaft, and the shaft gear is meshed with the inner teeth of the inner gear ring through self outer teeth, the trigger assembly is installed on the fixing frame and can rotate, and the trigger assembly is connected with the first hook in a rotating mode.

2. The manual switch and overcurrent protection mechanism of the vacuum circuit breaker according to claim 1, wherein: the manual switch and overcurrent protection mechanism of the vacuum circuit breaker further comprises a handle connecting rod, a connecting rod push rod and a unhooking spring, wherein the first end of the handle connecting rod is rotatably connected with the handle seat, the second end of the handle connecting rod is provided with the connecting rod push rod, the axial direction of the connecting rod push rod is mutually perpendicular to the axial direction of the handle connecting rod, the unhooking component further comprises a hook driving block and a hook rotating frame, the first hook is fixedly connected with the hook driving block, the first hook and the hook driving block are both installed on the fixed frame through a hook shaft and can rotate around the hook shaft, a section of circular arc-shaped groove is arranged on the circumferential outer wall of the inner gear ring, an inner gear ring notch is arranged on the circumferential outer wall of the inner gear ring, the position of the circumferential outer wall of the inner gear ring is close to one end of the circular arc-shaped groove, the hook rotating frame comprises a section of circular arc strip matched with the inner gear ring, the circular arc strip is arranged in the circular arc groove and fixedly connected with the second hook, a circular arc strip-shaped through hole is formed in the circular arc strip, the connecting rod push rod penetrates through the circular arc strip-shaped through hole and is simultaneously arranged in the gap of the inner gear ring and is blocked by the hole wall on one side of the circular arc strip-shaped through hole so that the connecting rod push rod cannot fall off the gap of the inner gear ring, connecting lugs are respectively arranged on the circumferential outer wall of the inner gear ring and the hook rotating frame, two ends of the hook-releasing spring are respectively connected with the two connecting lugs, the connecting lug on the inner gear ring and the gap of the inner gear ring are positioned on one side of the gear ring shaft and far away from the rotating frame shaft, and the connecting wire between the two connecting lugs is positioned on one side of, the trigger assembly comprises a trigger shaft, trigger pieces and a trigger connecting rod, the trigger shaft is installed on the fixing frame and can rotate, one or more trigger pieces are fixedly installed on the trigger shaft respectively, and two ends of the trigger connecting rod are connected with one of the trigger pieces and the hook driving block in a rotating mode respectively.

3. The manual switch and overcurrent protection mechanism of the vacuum circuit breaker according to claim 1 or 2, characterized in that: the through holes of the inner gear ring and the inner gears on the hole walls of the circular arc sections of the through holes meet the following requirements: when the inner gear ring rotates to enable the shaft gear to reach the other end from one end of the through hole of the inner gear ring, the shaft gear rotates by 160 degrees.

4. The manual switch and overcurrent protection mechanism of the vacuum circuit breaker according to claim 1 or 2, characterized in that: the radial section of the rotating shaft is waist-shaped.