CN108695119B

CN108695119B - Electric operating mechanism of miniature circuit breaker

Info

Publication number: CN108695119B
Application number: CN201710225427.5A
Authority: CN
Inventors: 何云成; 张紫成
Original assignee: Si Qi Science And Technology Ltd
Current assignee: Si Qi Science And Technology Ltd
Priority date: 2017-04-07
Filing date: 2017-04-07
Publication date: 2020-03-31
Anticipated expiration: 2037-04-07
Also published as: CN108695119A

Abstract

The invention relates to an electric operating mechanism of a miniature circuit breaker, which comprises a shell, a circuit board, a transmission group and a tripping group, wherein the transmission group comprises a motor, a worm, a gear set and a rotating shaft, the gear set comprises a primary gear meshed with the worm, a secondary gear meshed with the primary gear and a tertiary gear meshed with the secondary gear, a transmission sleeve is movably arranged on the front surface of the tertiary gear, a connecting part is arranged on the rotating shaft corresponding to the transmission sleeve, the connecting part is connected with the transmission sleeve through a pull rod, a shifting block matched with the transmission sleeve is arranged on one side of the front surface of the tertiary gear corresponding to the transmission sleeve, when the tertiary gear rotates towards the closing direction of the circuit breaker, the tertiary gear is in linkage fit with the transmission sleeve, and when the tertiary gear rotates towards the opening direction of the circuit breaker, the tertiary gear is freely matched with the transmission sleeve; the invention has the advantages of simple structure, stable and reliable performance, low manufacturing cost and capability of reliably realizing the opening and closing of the breaker.

Description

Electric operating mechanism of miniature circuit breaker

Technical Field

The invention relates to the technical field of circuit breakers, in particular to an electric operating mechanism of a miniature circuit breaker.

Background

At present, small circuit breakers are widely used in low-voltage distribution networks, mainly in various places such as industrial, commercial, high-rise and residential houses, and can perform overcurrent protection and leakage protection on electric devices such as motors, distribution lines and lighting circuits. With the development of intelligent power grids in China, on the premise of requiring safe operation of the power grids, the realization of intellectualization of control of electric appliances is more and more urgent. In order to cope with new situation changes, the existing miniature circuit breaker should be provided with an automatic reclosing function. The electric operating mechanism of the miniature circuit breaker is an accessory used for a remote electric opening and closing circuit breaker, is matched with the miniature circuit breaker special for the prepayment electric meter for use, and can realize reclosing after payment. However, the electric operating mechanism of the conventional small circuit breaker has the defects of complex structure, unstable performance and high manufacturing cost due to unreasonable structural design.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an electric operating mechanism of a small circuit breaker, which has the advantages of simple structure, stable and reliable performance, low manufacturing cost and capability of reliably realizing the opening and closing of the circuit breaker.

In order to achieve the purpose, the invention adopts an electric operating mechanism of a miniature circuit breaker, which comprises a shell, a circuit board, a transmission set and a tripping set, wherein the shell comprises a base and an upper cover, an accommodating cavity is formed between the base and the upper cover, the circuit board, the transmission set and the tripping set are respectively arranged in the accommodating cavity, the transmission set comprises a motor, a worm arranged on the motor, a gear set and a rotating shaft which is used for driving a handle of the circuit breaker and is matched with the gear set in a linkage manner, the gear set comprises a primary gear meshed with the worm, a secondary gear meshed with the primary gear and a tertiary gear meshed with the secondary gear, a transmission sleeve is movably arranged on the front surface of the tertiary gear, a connecting part is arranged on the rotating shaft corresponding to the transmission sleeve, the connecting part is connected with the transmission sleeve through a pull rod, and a shifting block matched with the transmission sleeve is arranged on one side of the front surface of the tertiary gear corresponding to the transmission sleeve, when the third-stage gear rotates towards the switching-on direction of the circuit breaker, the third-stage gear is in linkage fit with the transmission sleeve, and when the third-stage gear rotates towards the switching-off direction of the circuit breaker, the third-stage gear is freely matched with the transmission sleeve; the circuit board controls the motor to rotate forwards, reversely and stop, and the motor drives the transmission set to act and realize the reclosing action of the circuit breaker; the shell on be provided with a hand/automatic reclosing switch mechanism, this hand/automatic reclosing switch mechanism including set up conductive spring, the activity setting on the circuit board switch over the plectrum in the shell, conductive spring's first connecting portion clamp on the circuit board, conductive spring's second connecting portion activity sets up in the electrically conductive hole on the circuit board, be provided with the contact with second connecting portion matched with in the electrically conductive hole, conductive spring and switching over the plectrum linkage cooperation, and conductive spring's second connecting portion along with switching over the plectrum action and can break off or put through with the contact, realize closing or putting through of circuit board power.

The beneficial effect of above-mentioned structure is: this electric operating mechanism's transmission group passes through motor drive gear group, the gear train passes through the pull rod and drives the pivot rotation, the pivot drives the action of circuit breaker handle, realize the reclosing of circuit breaker, and the tertiary gear of gear train adopts separation and reunion structure setting with the transmission cover, thereby this transmission group is after the reclosing, can not influence the separating brake of circuit breaker, thereby the reliability of this electric operating mechanism work has been improved, and this electric operating mechanism has simple structure, low in manufacturing cost's advantage, and can realize the branch of circuit breaker reliably, combined floodgate. And the electric operating mechanism is provided with a manual/automatic reclosing switching mechanism, an operator pushes the conductive spring to act by poking the switching poking piece, the second connecting part of the conductive spring is disconnected or connected with the contact in the conductive hole, and the power supply of the circuit board can be turned off or connected, so that the switching between the manual reclosing function and the automatic reclosing function is realized.

Particularly, the base on be provided with a sliding groove, the switching plectrum setting in sliding groove, the both sides of switching plectrum on be provided with a joint piece respectively, and all be provided with a joint boss on each joint piece, the sliding groove of upper cover, base in be provided with two spacing draw-in grooves with each joint boss looks adaptation respectively, each joint boss along with switching plectrum action and with corresponding spacing draw-in groove looks joint, the up end of switching plectrum on be provided with the groove of dialling of exposing outside the casing. The switching plectrum adopts the mode of joint to be connected with the shell to be convenient for switch the equipment of plectrum and shell, and all be provided with on base, the upper cover with joint boss matched with two spacing draw-in grooves, operating personnel promotes the switching plectrum through dialling the groove, the joint boss on the joint piece can be along with switching plectrum action and can be reciprocal switching between two spacing draw-in grooves, thereby realize switching the plectrum between manual reclosing station operating position and automatic reclosing station operating position.

Particularly, a driving part is arranged on the lower end face of the switching poking piece, an arc-shaped protruding part matched with the driving part is arranged in the middle of the conductive spring, an arc-shaped groove sleeved on the arc-shaped protruding part of the conductive spring is arranged on the driving part, the driving part can push the second connecting part of the conductive spring to reciprocate in the conductive hole, and the second connecting part and a contact in the conductive hole can be connected or disconnected. The arc-shaped groove sleeved on the arc-shaped protruding portion of the conductive spring is arranged on the switching shifting piece, so that the arc-shaped groove can prevent the conductive spring from deviating when the conductive spring acts, the second connecting portion of the conductive spring is guaranteed to be in reliable contact with a contact in the conductive hole, and the working reliability of the manual/automatic reclosing switching mechanism is improved.

Especially, the dropout group including rotate the jump that sets up in the base detain, correspond jump and detain the department setting in the base and with jump and detain matched with torsional spring, the one end of torsional spring contradict on the spacing post in the base, the other end of torsional spring is contradicted on jumping the gag lever post of detaining, jump detain and be provided with the trip bar that is connected with circuit breaker tripping device, tertiary gear's reverse side on have one with jump and detain matched with boss, tertiary gear when rotating toward circuit breaker closing direction, tertiary gear and the free cooperation of jumping the knot, tertiary gear when rotating toward circuit breaker separating brake direction, boss on the tertiary gear drives the trip and detains the rotation and can realize the tripping action of a mouthful group. When the tripping group is tripped, the tertiary gear rotates towards the opening direction of the breaker towards the tertiary gear, the boss on the tertiary gear drives the tripping buckle to rotate, the tripping buckle drives the tripping rod to act, and the tripping rod drives the tripping mechanism of the breaker to act, so that the tripping of the breaker is realized.

Particularly, jump and detain and have a portion of colluding on one side towards the boss, the boss on have one with colluding portion matched with circular arc fitting surface, tertiary gear when toward circuit breaker opening direction rotation, the circular arc fitting surface of boss is contradicted on the portion of colluding that jumps and detains, and circular arc fitting surface and the line contact of the portion of colluding that jumps and detain. The jump buckle and the boss are matched in a line contact mode, so that the jump buckle can be prevented from being clamped by the boss, and the working reliability of the jump buckle group is improved.

Drawings

Fig. 1 is a perspective view of the embodiment of the present invention with the upper cover removed.

Fig. 2 is a perspective view of the embodiment of the present invention with the base removed.

Fig. 3 is an enlarged view of a portion a in fig. 1.

Fig. 4 is an assembly structure view of the base and the trip unit of the present invention.

Fig. 5 is a perspective view of the upper cover of the present invention.

Fig. 6 is a perspective view of the switching paddle of the present invention.

Detailed Description

As shown in fig. 1 to 6, an embodiment of the present invention is an electric operating mechanism of a miniature circuit breaker, including a housing 10, a circuit board 20, a transmission set 30, and a trip set 40, where the housing 10 includes a base 11 and an upper cover 12, an accommodating cavity is formed between the base 11 and the upper cover 12, the circuit board 20, the transmission set 30, and the trip set 40 are respectively disposed in the accommodating cavity, the transmission set 30 includes a motor 31, a worm 32 disposed on the motor 31, a gear set 33, and a rotating shaft 34 for driving a handle of the circuit breaker and cooperating with the gear set 33, the gear set 33 includes a first-stage gear 331 engaged with the worm 32, a second-stage gear 332 engaged with the first-stage gear 331, and a third-stage gear 333 engaged with the second-stage gear 332, a transmission sleeve 35 is movably disposed on a front surface of the third-stage gear 333, a connecting portion 341 is disposed on the rotating shaft 34 corresponding to the transmission sleeve 35, the connecting part 341 is connected with the transmission sleeve 35 through a pull rod 36, a toggle block 3331 matched with the transmission sleeve 35 is arranged on one side of the front surface of the tertiary gear 333 corresponding to the transmission sleeve 35, when the tertiary gear 333 rotates towards the closing direction of the circuit breaker, the tertiary gear 333 is in linkage fit with the transmission sleeve 35, and when the tertiary gear 333 rotates towards the opening direction of the circuit breaker, the tertiary gear 333 is freely matched with the transmission sleeve 35; the circuit board 20 controls the motor 31 to rotate forward, reversely and stop, and the motor 31 drives the transmission set 30 to act and realize the reclosing action of the circuit breaker; the shell 10 is provided with a manual/automatic reclosing switching mechanism 50, the manual/automatic reclosing switching mechanism 50 comprises a conductive spring 51 and a switching poking piece 52, the conductive spring 51 is arranged on a circuit board 20, the switching poking piece 52 is movably arranged in the shell 10, a first connecting part 511 of the conductive spring 51 is clamped on the circuit board, a second connecting part 512 of the conductive spring 51 is movably arranged in a conductive hole 21 in the circuit board 20, a contact 22 matched with the second connecting part 512 is arranged in the conductive hole 21, the conductive spring 51 is in linkage fit with the switching poking piece 52, and the second connecting part 512 of the conductive spring 51 acts along with the switching poking piece 52 and can be disconnected or connected with the contact 22, so that the power supply of the circuit board 20 is turned off or connected. The manual/automatic reclosing switching mechanism is used for switching between a manual reclosing function and an automatic reclosing function by switching off or on a power supply of a circuit board.

As shown in fig. 3, 4, 5, and 6, the base 11 is provided with a sliding groove 111, the switching dial 52 is disposed in the sliding groove 111, two sides of the switching dial 52 are respectively provided with a locking piece 521, each locking piece 521 is provided with a locking boss 522, the sliding grooves 111 of the upper cover 12 and the base 11 are respectively provided with two limit locking grooves 112 adapted to the locking bosses 522, each locking boss 522 moves along with the switching dial 52 and is locked with the corresponding limit locking groove 112, and the upper end surface of the switching dial 52 is provided with a dial groove 525 exposed outside the housing 10. The switching plectrum adopts the mode of joint to be connected with the shell to be convenient for switch the equipment of plectrum and shell, and all be provided with on base, the upper cover with joint boss matched with two spacing draw-in grooves, operating personnel promotes the switching plectrum through dialling the groove, the joint boss on the joint piece can be along with switching plectrum action and can be reciprocal switching between two spacing draw-in grooves, thereby realize switching the plectrum between manual reclosing station operating position and automatic reclosing station operating position. As shown in fig. 1, 2, 3, and 6, a driving portion 523 is disposed on a lower end surface of the switching paddle 52, an arc-shaped protrusion 513 matched with the driving portion 523 is disposed in a middle portion of the conductive spring 51, an arc-shaped groove 524 sleeved on the arc-shaped protrusion 513 of the conductive spring 51 is disposed on the driving portion 523, the driving portion 523 can push the second connecting portion 512 of the conductive spring 51 to reciprocate in the conductive hole 21, and the second connecting portion 512 can be connected with or disconnected from the contact 22 in the conductive hole 21. The arc-shaped groove sleeved on the arc-shaped protruding portion of the conductive spring is arranged on the switching shifting piece, so that the arc-shaped groove can prevent the conductive spring from deviating when the conductive spring acts, the second connecting portion of the conductive spring is guaranteed to be in reliable contact with a contact in the conductive hole, and the working reliability of the manual/automatic reclosing switching mechanism is improved.

As shown in fig. 2 and 4, the trip set 40 includes a trip buckle 41 rotatably disposed in the base 11, a torsion spring 42 disposed in the base 11 and corresponding to the trip buckle 41, one end of the torsion spring 42 abuts against a limit post 113 disposed in the base 11, the other end of the torsion spring 42 abuts against a limit rod 411 disposed on the trip buckle 41, the trip buckle 41 is provided with a trip rod 43 connected to a trip mechanism of the circuit breaker, a boss 3332 disposed on the reverse side of the tertiary gear 333 and engaged with the trip buckle 41, when the tertiary gear 333 rotates in a closing direction of the circuit breaker, the tertiary gear 333 freely cooperates with the trip buckle 41, and when the tertiary gear 333 rotates in a opening direction of the circuit breaker, the boss 3332 disposed on the tertiary gear 333 drives the trip buckle 41 to rotate and can release the trip action of the trip set 40. When the tripping group is tripped, the tertiary gear rotates towards the opening direction of the breaker towards the tertiary gear, the boss on the tertiary gear drives the tripping buckle to rotate, the tripping buckle drives the tripping rod to act, and the tripping rod drives the tripping mechanism of the breaker to act, so that the tripping of the breaker is realized. As shown in fig. 2, a hook 412 is disposed on a side of the trip buckle 41 facing the boss 3332, the boss 3332 has an arc engaging surface 3333 engaged with the hook 412, when the tertiary gear 333 rotates in the opening direction of the circuit breaker, the arc engaging surface 3333 of the boss 3332 abuts against the hook 412 of the trip buckle 41, and the arc engaging surface 3333 is in line contact with the hook 412 of the trip buckle 41. The jump buckle and the boss are matched in a line contact mode, so that the jump buckle can be prevented from being clamped by the boss, and the working reliability of the jump buckle group is improved.

This electric operating mechanism's transmission group passes through motor drive gear group, the gear train passes through the pull rod and drives the pivot rotation, the pivot drives the action of circuit breaker handle, realize the reclosing of circuit breaker, and the tertiary gear of gear train adopts separation and reunion structure setting with the transmission cover, thereby this transmission group is after the reclosing, can not influence the separating brake of circuit breaker, thereby the reliability of this electric operating mechanism work has been improved, and this electric operating mechanism has simple structure, low in manufacturing cost's advantage, and can realize the branch of circuit breaker reliably, combined floodgate. And the electric operating mechanism is provided with a manual/automatic reclosing switching mechanism, an operator pushes the conductive spring to act by poking the switching poking piece, the second connecting part of the conductive spring is disconnected or connected with the contact in the conductive hole, and the power supply of the circuit board can be turned off or connected, so that the switching between the manual reclosing function and the automatic reclosing function is realized.

Claims

1. The utility model provides a miniature circuit breaker's electric operating mechanism, includes shell, circuit board, transmission group, dropout group, the shell include base and upper cover, constitute between base and the upper cover and have a holding chamber, circuit board, transmission group, dropout group do not set up at the holding intracavity, its characterized in that: the transmission set comprises a motor, a worm arranged on the motor, a gear set and a rotating shaft which is used for driving a breaker handle and is in linkage fit with the gear set, the gear set comprises a primary gear meshed with the worm, a secondary gear meshed with the primary gear and a tertiary gear meshed with the secondary gear, a transmission sleeve is movably arranged on the front face of the tertiary gear, a connecting part is arranged on the rotating shaft corresponding to the transmission sleeve and connected with the transmission sleeve through a pull rod, a shifting block matched with the transmission sleeve is arranged on one side of the front face of the tertiary gear corresponding to the transmission sleeve, when the tertiary gear rotates towards the closing direction of the breaker, the tertiary gear is in linkage fit with the transmission sleeve, and when the tertiary gear rotates towards the opening direction of the breaker, the tertiary gear is freely matched with the transmission sleeve; the circuit board controls the motor to rotate forwards, reversely and stop, and the motor drives the transmission set to act and realize the reclosing action of the circuit breaker; the shell is provided with a manual/automatic reclosing switching mechanism, the manual/automatic reclosing switching mechanism comprises a conductive spring and a switching shifting piece, the conductive spring is arranged on a circuit board, the switching shifting piece is movably arranged in the shell, a first connecting part of the conductive spring is clamped on the circuit board, a second connecting part of the conductive spring is movably arranged in a conductive hole in the circuit board, a contact matched with the second connecting part is arranged in the conductive hole, the conductive hole is triangular, the contact is arranged at a sharp corner on one side of the triangle, the conductive spring is in linkage fit with the switching shifting piece, the second connecting part of the conductive spring acts along with the switching shifting piece and can be disconnected or connected with the contact, and the power supply of the circuit board is turned off or connected; the base is provided with a sliding groove, the switching shifting piece is arranged in the sliding groove, two sides of the switching shifting piece are respectively provided with a clamping piece, each clamping piece is provided with a clamping boss, the sliding grooves of the upper cover and the base are respectively provided with two limiting clamping grooves matched with the clamping bosses, each clamping boss acts along with the switching shifting piece and is clamped with the corresponding limiting clamping groove, and the upper end surface of the switching shifting piece is provided with a shifting groove exposed outside the shell; the lower end face of the switching shifting piece is provided with a driving part, the middle part of the conductive spring is provided with an arc-shaped protruding part matched with the driving part, the driving part is provided with an arc-shaped groove sleeved on the arc-shaped protruding part of the conductive spring, the driving part can push the second connecting part of the conductive spring to reciprocate in the conductive hole, and the second connecting part can be connected with or disconnected from a contact in the conductive hole; the tripping set comprises a tripping buckle which is rotatably arranged in the base, and a torsion spring which is arranged in the base corresponding to the tripping buckle and is matched with the tripping buckle, wherein one end of the torsion spring is abutted on a limiting column in the base, the other end of the torsion spring is abutted on a limiting rod on the tripping buckle, a tripping rod connected with a tripping mechanism of the circuit breaker is arranged on the tripping buckle, a boss matched with the tripping buckle is arranged on the reverse side of the tertiary gear, when the tertiary gear rotates towards the closing direction of the circuit breaker, the tertiary gear is freely matched with the tripping buckle, and when the tertiary gear rotates towards the opening direction of the circuit breaker, the boss on the tertiary gear drives the tripping buckle to rotate and can realize the tripping action of the tripping set; jump and detain and have a portion of colluding on one side of boss towards the boss, the boss on have one with collude portion matched with circular arc fitting surface, tertiary gear when toward circuit breaker separating brake direction rotation, the circular arc fitting surface of boss is contradicted on the portion of colluding that jumps and detains, and the circular arc fitting surface with jump the portion of colluding line contact that detains.