CN219610251U - Locking mechanism of circuit breaker and circuit breaker - Google Patents

Abstract

The utility model discloses a locking mechanism of a circuit breaker and the circuit breaker, wherein the locking mechanism of the circuit breaker comprises a switching-on/off button, an unlocking piece and a locking piece, and the switching-on/off button comprises a locking matching section and an unlocking driving section; the unlocking piece comprises a first boss, the first boss can protrude or retract into the limiting hole, and when the first boss extends out of the limiting hole, the locking matching section is matched with the unlocking piece to lock the opening and closing button; the locking piece comprises a second boss, and the second boss can protrude or retract into the anti-pulling hole; when the opening and closing button is closed, the unlocking driving section is matched with the locking piece, and the second boss is locked at the position protruding out of the anti-pulling hole. The locking mechanism of the circuit breaker improves the working safety and reliability of the circuit breaker, has a simple structure and is suitable for the circuit breaker with smaller volume.

Description

Locking mechanism of circuit breaker and circuit breaker

Technical Field

The utility model relates to the technical field of piezoelectric devices, in particular to a locking mechanism of a circuit breaker and the circuit breaker.

Background

The plug-in circuit breaker can be conveniently installed in or withdrawn from the circuit in a plug-in mode, is simple to operate and small in occupied space while meeting the requirements of different electrical equipment on the power quality, and has been developed into various types. To prevent live operation, existing plug-in circuit breakers are typically provided with corresponding locking mechanisms, but existing locking mechanisms suffer from the following drawbacks: corresponding locking pieces, unlocking pieces, transmission pieces and the like are required to be arranged generally, more parts are involved, more occupied space is occupied, and the miniaturization design requirement of the circuit breaker is difficult to meet; the function is single, only can prevent certain potential safety hazard, if only can prevent that the circuit breaker from inserting the rack under the switch-on state, or only can prevent that the circuit breaker from pulling out etc. in the rack under the switch-on state, can't prevent multiple potential safety hazard simultaneously.

Therefore, it is needed to provide a locking mechanism of a circuit breaker and the circuit breaker to solve the above problems.

Disclosure of Invention

According to one aspect of the utility model, the locking mechanism of the circuit breaker can simultaneously prevent multiple hidden dangers of the circuit breaker, improves the working safety and reliability of the circuit breaker, has a simple structure and is suitable for the circuit breaker with smaller volume.

To achieve the purpose, the utility model adopts the following technical scheme:

the locking mechanical system of circuit breaker for the circuit breaker, the circuit breaker includes the shell and sets up spacing hole and the anti-pulling hole on the shell, the locking mechanical system of circuit breaker includes:

the unlocking piece is assembled on the shell in a direct-acting mode and comprises a first boss, and the first boss can protrude or retract into the limiting hole;

the locking piece is assembled on the shell in a direct-acting mode, and comprises a second boss which can protrude out of or retract into the anti-pulling hole so as to lock or unlock the locking piece and the cabinet;

the opening and closing button is in sliding connection with the shell and comprises a locking matching section and an unlocking driving section; when the first boss protrudes out of the limiting hole, the locking matching section is matched with the unlocking piece to lock the opening and closing button; when the opening and closing button is closed, the unlocking driving section is matched with the locking piece to lock the second boss at the position protruding out of the anti-pulling hole.

Optionally, the unlocking driving section abuts against the lower end face of the locking piece, so that the second boss is locked at a position protruding out of the anti-pulling hole.

Optionally, the unlocking piece further comprises a locking section, and when the first boss extends out of the limiting hole, the locking section is abutted with the locking matching section to lock the opening and closing button.

Optionally, the locking mechanism of the circuit breaker further comprises:

one end of the unlocking rod is rotationally connected with the locking piece, and the other end of the unlocking rod is abutted with the unlocking driving section;

the supporting part is arranged on the shell, the middle part of the unlocking rod is abutted with the supporting part, the opening and closing button is pulled, and the unlocking driving section can enable the unlocking rod to rotate by taking the supporting part as a fulcrum and drive the second boss to retract into the anti-pulling hole.

Optionally, the locking piece further comprises a body, a connecting hole is formed in the first end face of the body, a rotating shaft is arranged at one end of the unlocking rod, and the rotating shaft is rotationally inserted into the connecting hole.

Optionally, the unlocking driving section includes a slope, the slope is abutted with the other end of the unlocking lever, and the slope extends in a direction away from the other end of the unlocking lever.

Optionally, the circuit breaker further includes a locking spring member, the locking spring member is disposed on the housing, one end of the locking spring member is connected to the unlocking member, the other end of the locking spring member is connected to the locking member, and the locking spring member is used for driving the first boss to extend out of the limiting hole and driving the second boss to extend out of the anti-pulling hole.

Optionally, the locking piece further includes a body, be equipped with spacing portion and butt portion on the second terminal surface of body, spacing portion the butt portion with the body encloses to establish and forms first spacing groove, the one end setting of locking spring piece is in first spacing inslot, and with butt portion butt.

Optionally, the unlocking lever is in a U shape.

Optionally, the switch-on/off button further comprises an indication driving section, an indication part is rotationally connected in the shell, the indication part comprises a switch-on indication part and a switch-off indication part, a display window is arranged on the shell, and the indication driving section can enable the switch-on indication part or the switch-off indication part to be opposite to the display window along with the sliding of the switch-on/off button.

Optionally, a second limiting groove is formed in the unlocking piece, and the other end of the locking spring piece is arranged in the second limiting groove and is abutted to the top wall of the second limiting groove.

Optionally, the opening and closing button further includes:

the first avoiding groove, the locking section can with the first groove sliding connection that dodges, so that divide-shut brake button can move to the closing position.

Optionally, the opening and closing button further includes:

the second dodges the groove, the other end of unlocking lever with the groove sliding connection is dodged to the second, so that the divide-shut brake button can move to separating brake position and closing brake position, the unblock actuating section sets up the second dodges the groove and is close to the one end of locking piece.

According to another aspect of the utility model, the utility model further provides a circuit breaker, which comprises the locking mechanism of the circuit breaker according to any one of the technical schemes.

The utility model has the beneficial effects that:

the utility model provides a locking mechanism of a circuit breaker, which comprises a switching-on/off button, an unlocking piece and a locking piece. The first boss of the unlocking piece can protrude and retract into the limit hole of the circuit breaker shell, when the circuit breaker is not installed in the cabinet, the first boss protrudes out of the limit hole, at the moment, the locking section of the unlocking piece is matched with the locking matching section of the opening and closing button, the opening and closing button is locked, and the opening and closing button cannot be continuously pressed to realize closing of the circuit breaker; after the circuit breaker is installed into the rack, the inner wall of rack is with first boss jack-in spacing downthehole, at this moment, release spacingly between the locking section of unblock piece and the locking cooperation section, can press the closing button and realize the closing of circuit breaker, just can release the spacing that the unblock piece was separated and closed button after the circuit breaker only installs the rack promptly, make the circuit breaker normally close a floodgate, effectively prevented that the circuit breaker from inserting the rack under the state of closing a floodgate to and effectively avoided the switching-on operation of circuit breaker outside the rack, improved the security performance of circuit breaker.

After the circuit breaker is installed into the cabinet, the second boss of locking piece protrudes and prevents pulling out the hole and inserts the cabinet inner wall, and under the state of closing a floodgate, the unlocking driving section butt locking piece terminal surface under the circuit breaker locks the position in protruding and prevents pulling out the hole for under the state of closing a floodgate of circuit breaker, unable pull out the circuit breaker from the cabinet, effectively prevent that the live wire from pulling out the circuit breaker, improved the security performance of circuit breaker.

Through with the unlatching piece direct action assembly on the shell to and with the locking piece direct action assembly on the shell, compare with unlatching piece and locking piece rotation assembly in prior art on the shell, the space that unlatching piece and locking piece's motion track occupy is littleer, is favorable to the miniaturized design of circuit breaker.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic structural view of a locking mechanism of a circuit breaker (the circuit breaker is not inserted into a cabinet) according to an embodiment of the present utility model;

fig. 2 is a schematic diagram II of a locking mechanism of a circuit breaker according to an embodiment of the present utility model (the circuit breaker is in a breaking state);

fig. 3 is a schematic structural diagram III of a locking mechanism of a circuit breaker according to an embodiment of the present utility model (the circuit breaker is in a closed state);

fig. 4 is a schematic structural view of a locking mechanism of a circuit breaker according to an embodiment of the present utility model (the circuit breaker is in a removable state);

FIG. 5 is a schematic view of a locking member according to an embodiment of the present utility model;

FIG. 6 is a schematic structural view of a locking member according to a second embodiment of the present utility model;

fig. 7 is a schematic structural view of an unlocking lever according to an embodiment of the present utility model;

fig. 8 is a schematic structural diagram of an unlocking member according to an embodiment of the present utility model;

FIG. 9 is a schematic view of a locking spring member according to an embodiment of the present utility model;

fig. 10 is a schematic structural diagram of an opening and closing button according to an embodiment of the present utility model;

fig. 11 is a front view of an opening and closing button provided in an embodiment of the present utility model;

fig. 12 is a schematic structural view of an indicator according to an embodiment of the present utility model.

In the figure:

100. a housing; 110. a support part; 200. an opening and closing button; 210. locking the mating section; 220. unlocking the driving section; 230. an indication drive section; 240. a first avoidance groove; 250. a second avoidance groove; 300. an unlocking member; 310. a first boss; 320. a locking section; 330. the second limit groove; 400. a locking member; 410. a second boss; 420. a body; 421. a connection hole; 422. a limit part; 423. an abutting portion; 424. a first limit groove; 500. unlocking the rod; 510. a rotating shaft; 600. a locking spring member; 610. a first driving arm; 620. a second driving arm; 700. an indicator; 710. a closing instruction unit; 720. a brake-off indication part; 730. a first transmission section; 740. and a second transmission section.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The embodiment provides a locking mechanical system of circuit breaker, can prevent the multiple hidden danger of circuit breaker simultaneously, has improved the operational safety and the reliability of circuit breaker to simple structure is applicable to the smaller circuit breaker of volume.

The locking mechanism of the circuit breaker is used in the circuit breaker, as shown in fig. 1-4, the circuit breaker comprises a shell 100, a limiting hole and an anti-pulling hole, wherein the limiting hole and the anti-pulling hole are formed in the shell 100, and specifically, the locking mechanism of the circuit breaker comprises an opening and closing button 200, an unlocking piece 300 and a locking piece 400. The opening and closing button 200 is slidably connected to the housing 100, and the opening and closing button 200 includes a locking mating section 210 and an unlocking driving section 220. The unlocking piece 300 comprises a first boss 310, the first boss 310 can protrude or retract into a limit hole so that the opening and closing button 200 is locked or unlocked, when the first boss 310 extends out of the limit hole, the unlocking piece 300 can limit the locking matching section 210, at the moment, the opening and closing button 200 cannot be pressed to enable the circuit breaker to be closed, and only after the circuit breaker is mounted to a cabinet, the inner wall of the cabinet pushes the first boss 310 into the limit hole, the limit of the unlocking piece 300 to the locking matching section 210 can be released, the circuit breaker can be normally closed, the circuit breaker is effectively prevented from being inserted into the cabinet in a closing state and closing operation outside the cabinet, and the safety performance of the circuit breaker is improved. In this embodiment, the unlocking member 300 further includes a locking section 320, when the first boss 310 protrudes out of the limiting hole, the opening and closing button 200 is pressed, and the locking mating section 210 abuts against the locking section 320, so that the opening and closing button 200 cannot be continuously pressed. In other embodiments, the limiting structure of the locking section 320 to the locking mating section 210 may be set to be other, and may be set according to actual needs. The locking member 400 includes a second boss 410, and the second boss 410 can protrude or retract into the pull-out preventing hole to lock or unlock the locking member 400 from the cabinet. After the circuit breaker is installed into the cabinet, the second boss 410 of the locking piece 400 protrudes out of the anti-pulling hole and is inserted into the inner wall of the cabinet, the unlocking driving section 220 is matched with the locking piece 400 in a closing state of the circuit breaker, the second boss 410 is locked at the position of the protruding anti-pulling hole, the circuit breaker cannot be pulled out of the cabinet in the closing state of the circuit breaker, the circuit breaker is effectively prevented from being pulled out in a live mode, and the safety performance of the circuit breaker is improved. By assembling the unlocking member 300 directly on the housing 100 and assembling the locking member 400 directly on the housing, the space occupied by the motion tracks of the unlocking member 300 and the locking member 400 is smaller compared with the prior art that the unlocking member 300 and the locking member 400 are rotatably assembled on the housing 100, which is beneficial to the miniaturization design of the circuit breaker.

The unlocking member 300 and the locking member 400 are directly assembled to the housing 100, and the direct-acting assembly herein means that the unlocking member 300 and the locking member 400 are linearly moved in the housing 100, not rotated.

Optionally, when the circuit breaker is closed, the unlocking driving section 220 abuts against the lower end surface of the locking piece 400, locks the second boss 410 at the position of the protruding anti-pulling hole, and avoids the second boss 410 from retracting into the anti-pulling hole due to external pressure and other factors, so that the second boss 410 is reliably connected with the cabinet, and further the circuit breaker and the cabinet can be kept in a locking state all the time.

Further, the locking mechanism of the circuit breaker further comprises an unlocking lever 500, wherein one end of the unlocking lever 500 is rotatably connected with the locking piece 400, and the other end of the unlocking lever is abutted with the unlocking driving section 220; the supporting portion 110 is arranged on the shell 100, the middle portion of the unlocking rod (500) is in butt joint with the supporting portion 110, after the breaker is opened, the opening and closing button 200 is pulled continuously, the unlocking driving section 220 can drive the unlocking rod 500 to rotate by taking the supporting portion 110 as a fulcrum, the unlocking rod 500 enables the second boss 410 to be pulled into the anti-pulling hole, at the moment, the second boss 410 is unlocked from the cabinet, and the shell 100 can be pulled to take the breaker off the cabinet. The unlocking driving section 220 is connected with the locking piece 400 in a transmission manner through the unlocking rod 500, so that the circuit breaker is simple in structure and reliable in transmission, and is beneficial to meeting the miniaturization design requirement of the circuit breaker.

Optionally, the locking mechanism of the circuit breaker further includes a locking spring piece 600, the locking spring piece 600 is disposed on the housing 100, one end of the locking spring piece 600 is connected with the unlocking piece 300, the other end is connected with the locking piece 400, by disposing the locking spring piece 600, the first boss 310 can always keep the state of the protruding limiting hole under the condition that the first boss 310 is not subjected to other external forces, and the second boss 410 can always keep the state of the protruding anti-pulling hole under the condition that the second boss 410 is not subjected to external forces, so that the reliability of the operation of the first boss 310 and the second boss 410 is ensured, and the locking spring piece 600 is simple in structure and small in occupied space, and by disposing one locking spring piece 600, the reset of the unlocking piece 300 and the locking piece 400 can be realized, so that parts are saved, the structure inside the circuit breaker is more compact, and the design requirement of miniaturization of the circuit breaker is facilitated to be satisfied.

For easy understanding, the operation of the locking mechanism of the circuit breaker will be briefly described:

as shown in fig. 1, at this time, the circuit breaker is not inserted into the cabinet, at this time, under the action of the locking spring member 600, the first boss 310 protrudes out of the limiting hole, and when the opening and closing button 200 is pressed, the locking matching section 210 will abut against the locking section 320, so that the opening and closing button 200 cannot be pressed in place, and closing of the circuit breaker is achieved, that is, if the circuit breaker is not inserted into the cabinet, closing cannot be achieved, and thus, live operation can be effectively prevented, and safety performance is high.

As shown in fig. 2, the circuit breaker is inserted into the cabinet at this time, the second boss 410 protrudes out of the anti-pulling hole to be plugged into the cabinet, and the circuit breaker cannot be pulled out of the cabinet by external force. The inner wall of the cabinet pushes the first boss 310 into the limiting hole, the locking section 320 releases the limit of the locking matching section 210, and at this time, as shown in fig. 3, the opening and closing button 200 is pressed, so that the circuit breaker can be closed; pulling the opening and closing button 200 can realize opening of the circuit breaker.

As shown in fig. 4, in the opening state of the circuit breaker, the opening and closing button 200 is continuously pulled, the unlocking driving section 220 pulls the other end of the unlocking lever 500, so that the unlocking lever 500 rotates with the supporting portion as a fulcrum, the unlocking lever 500 rotates to drive the locking piece 400 connected with one end of the unlocking lever 500 to slide relative to the housing 100 and enter the anti-pulling hole, at this time, the second boss 410 is disconnected with the cabinet, and the circuit breaker can be taken out through external force.

Alternatively, as shown in fig. 5 to 9, the locking member 400 further includes a body 420, a limiting portion 422 and an abutting portion 423 are disposed on a second end surface of the body 420, the limiting portion 422, the abutting portion 423 and the body 420 enclose to form a first limiting groove 424, and one end of the locking spring member 600 is disposed in the first limiting groove 424 and abuts against the abutting portion 423. By providing the limiting portion 422, the locking spring 600 can be stopped, the locking spring 600 is prevented from being separated from the abutting portion 423, the reliability of the locking spring 600 is improved, and meanwhile, the reliability of the circuit breaker locking by the second boss 410 is also improved. In the present embodiment, the second boss 410 is disposed above the body 420. Optionally, the unlocking member 300 is provided with a second limiting groove 330, the other end of the locking spring member 600 is disposed in the second limiting groove 330 and is abutted against the top wall of the second limiting groove 330, so that the unlocking member 300 is simple in structure and convenient to assemble between the locking spring member 600 and the unlocking member 300. In this example, the locking spring member 600 is a torsion spring, which includes a first driving arm 610 and a second driving arm 620, where the first driving arm 610 is mounted in the first limiting slot 424, and the second driving arm 620 is mounted in the second limiting slot 330.

Optionally, in this embodiment, the first boss 310 and the locking section 320 are enclosed to form an L shape, which has a simple structure and occupies a small space.

Further, with continued reference to fig. 6 and 7, the second end surface of the body 420 is provided with a connection hole 421, one end of the unlocking lever 500 is provided with a rotating shaft 510, and the rotating shaft 510 is inserted into the connection hole 421 and can rotate relative to the connection hole 421, so that the unlocking lever 500 is simple in structure and convenient to mount and dismount from the locking member 400.

Alternatively, in the present embodiment, the unlocking lever 500 has a U shape, so that one end is connected to the locking member 400 and the other end is in driving connection with the unlocking driving section 220. In other embodiments, the unlocking lever 500 may be shaped otherwise, and may be configured according to actual needs.

Further, with continued reference to fig. 1, 2, 3, 10 and 11, the opening and closing button 200 further includes a first avoidance slot 240, and the locking segment 320 can be slidably connected to the first avoidance slot 240, so that the opening and closing button 200 can move to the closing position. That is, after the lock section 320 and the lock matching section 210 are released from the limit, the lock section enters the first avoidance groove 240, and at this time, the opening and closing button 200 is pressed, so that the opening and closing button 200 can be moved to a closing position, and closing of the circuit breaker is realized. By providing the first avoidance groove 240, the reliability of the closing operation of the opening and closing button 200 can be ensured.

Further, the opening and closing button 200 further includes a second avoidance groove 250, the other end of the unlocking lever 500 is slidably connected with the second avoidance groove 250, and when the opening and closing button 200 is pressed to move to the closing position and the opening and closing button 200 is pulled to move to the opening and closing position, one end of the unlocking lever 500, which is not connected with the locking piece 400, is slidably connected with the second avoidance groove 250, so that the reliability of the operation of the opening and closing button 200 is ensured. The unlocking driving section 220 is disposed at one end of the second avoidance groove 250 near the locking member 400, so that when the opening and closing button 200 is in the opening and closing position, and the opening and closing button 200 is continuously pulled, the unlocking driving section 220 can contact with the other end of the unlocking lever 500 and drive it to rotate.

Preferably, with continued reference to fig. 10 and 11, the unlocking drive section 220 includes a ramp that abuts the other end of the unlocking lever 500. Through setting up inclined plane and unlocking lever 500 butt to the inclined plane extends to the direction of the other end of the remote unlocking lever 500, at the in-process of drawing divide-shut brake button 200, can avoid unlocking drive section 220 and unlocking lever 500's the other end card to die and can't draw divide-shut brake button 200 in place, guarantees the reliability of divide-shut brake button 200 work.

Further, as shown in fig. 1 and 12, the opening and closing button 200 further includes an indication driving section 230, the circuit breaker further includes an indicator 700, the indicator 700 is rotatably connected with the housing 100, the indicator 700 includes a closing indication portion 710 and an opening indication portion 720, a display window (not shown in the drawing) is disposed on the housing 100, the opening and closing button 200 is pressed, the indication driving section 230 can drive the indicator 700 to rotate to a limit position along a first direction, and at this time, the closing indication portion 710 faces the display window, and the circuit breaker is displayed to close; the switch-off and switch-on button 200 is pulled, the indication driving section 230 can drive the indication member 700 to rotate to the limit position along the second direction, and at this time, the switch-off indication portion 720 is opposite to the display window, and the switch-off of the circuit breaker is displayed. By arranging the opening and closing button 200 to drive the indicating piece 700 to work, a user can intuitively know the working state of the circuit breaker, and the experience of the user is improved.

Optionally, in this embodiment, the indicator 700 further includes a first transmission section 730 and a second transmission section 740, the indication driving section 230 is disposed between the first transmission section 730 and the second transmission section 740, and the opening/closing button 200 is pressed, so that the indication driving section 230 pushes the first transmission section 730 to rotate, thereby realizing the rotation of the indicator 700 along the first direction; the switch-on/off button 200 is pulled, and the indication driving section 230 pushes the second transmission section 740 to rotate, so that the indication member 700 rotates along the second direction. In other embodiments, the transmission structure between the indication driving section 230 and the indication member 700 may be other, and may be set according to actual needs.

The embodiment also provides a circuit breaker, comprising the locking mechanism of the circuit breaker, and the circuit breaker is higher in working safety and reliability and smaller in size due to the adoption of the locking mechanism of the circuit breaker.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a locking mechanical system of circuit breaker for the circuit breaker, the circuit breaker includes shell (100) and sets up spacing hole and anti-pulling hole on shell (100), its characterized in that, locking mechanical system of circuit breaker includes:

the unlocking piece (300) is assembled on the shell (100) in a direct-acting mode, the unlocking piece (300) comprises a first boss (310), and the first boss (310) can protrude or retract into the limit hole;

the locking piece (400) is assembled on the shell (100) in a direct-acting mode, the locking piece (400) comprises a second boss (410), and the second boss (410) can protrude or retract into the anti-pulling hole so as to lock or unlock the locking piece (400) and the cabinet;

the opening and closing button (200) is in sliding connection with the shell (100), and the opening and closing button (200) comprises a locking matching section (210) and an unlocking driving section (220); when the first boss (310) protrudes out of the limiting hole, the locking matching section (210) is matched with the unlocking piece (300) to lock the opening and closing button (200); when the opening and closing button (200) is closed, the unlocking driving section (220) is matched with the locking piece (400) to lock the second boss (410) at the position protruding out of the anti-pulling hole.

2. The locking mechanism of the circuit breaker according to claim 1, wherein the unlocking driving section (220) abuts against a lower end surface of the locking member (400) to lock the second boss (410) in a position protruding the pull-out preventing hole.

3. The locking mechanism of the circuit breaker according to claim 1, wherein the unlocking member (300) further comprises a locking section (320), the locking section (320) abutting against the locking engagement section (210) to lock the opening and closing button (200) when the first boss (310) protrudes out of the limit hole.

4. The locking mechanism of a circuit breaker of claim 1, wherein the locking mechanism of a circuit breaker further comprises:

the unlocking rod (500), one end of the unlocking rod (500) is rotationally connected with the locking piece (400), and the other end of the unlocking rod is abutted with the unlocking driving section (220);

the supporting part (110) is arranged on the shell (100), the middle part of the unlocking rod (500) is in butt joint with the supporting part (110), the opening and closing button (200) is pulled, the unlocking driving section (220) can enable the unlocking rod (500) to rotate by taking the supporting part (110) as a fulcrum and drive the second boss (410) to retract into the anti-pulling hole.

5. The locking mechanism of a circuit breaker according to claim 4, wherein the locking member (400) further comprises a body (420), a first end surface of the body (420) is provided with a connection hole (421), one end of the unlocking lever (500) is provided with a rotating shaft (510), and the rotating shaft (510) is rotatably inserted into the connection hole (421).

6. The locking mechanism of a circuit breaker according to claim 4, wherein the unlocking driving section (220) includes a slope abutting against the other end of the unlocking lever (500), the slope extending in a direction away from the other end of the unlocking lever (500).

7. The locking mechanism of a circuit breaker according to claim 1, further comprising a locking spring member (600), wherein the locking spring member (600) is disposed on the housing (100), one end of the locking spring member (600) is connected to the unlocking member (300), the other end is connected to the locking member (400), and the locking spring member (600) is configured to drive the first boss (310) to extend out of the limiting hole and drive the second boss (410) to extend out of the anti-pull hole.

8. The locking mechanism of a circuit breaker according to claim 7, wherein the locking member (400) further comprises a body (420), a limiting portion (422) and an abutting portion (423) are disposed on a second end surface of the body (420), a first limiting groove (424) is formed by surrounding the limiting portion (422), the abutting portion (423) and the body (420), and one end of the locking spring member (600) is disposed in the first limiting groove (424) and abuts against the abutting portion (423).

9. The locking mechanism of any one of claims 1-8, wherein the opening and closing button (200) further comprises an indication driving section (230), an indicator (700) is rotationally connected to the housing (100), the indicator (700) comprises a closing indicator (710) and an opening indicator (720), a display window is provided on the housing (100), and the indication driving section (230) can enable the closing indicator (710) or the opening indicator (720) to face the display window along with sliding of the opening and closing button (200).

10. Circuit breaker, characterized in that it comprises a locking mechanism of the circuit breaker according to any of claims 1-9.