CN101447372B

CN101447372B - Tripping mechanism of circuit breaker

Info

Publication number: CN101447372B
Application number: CN2008102079440A
Authority: CN
Inventors: 张晓敏; 张敏海
Original assignee: SHANGHAI ROGY ELECTRICITY CO Ltd
Current assignee: Shanghai Yongji Electrical Holding Co ltd
Priority date: 2008-12-26
Filing date: 2008-12-26
Publication date: 2011-05-11
Anticipated expiration: 2028-12-26
Also published as: CN101447372A

Abstract

The invention discloses a tripping mechanism of a circuit breaker, which comprises a traction rod and a locking piece, wherein, the traction rod comprises at least one rotating arm, a lever part, a first spring, an energy accumulation part and a second spring; wherein, the one end of the lever part leans against the rotating arm on the traction rod, the other end thereof is provided with a stop hook, and the middle part is provided with a first rotating shaft; the first spring acts on the lever part to lead the lever part to lean against the rotating arm on the traction rod; the energy accumulation part is rotatablely installed on a second rotating shaft, a locking arm and a trigger arm are arranged on the energy accumulation part, the end part of the locking arm is connected with the stop hook on the lever part in a hanging way, and the trigger arm can be contacted with the locking piece; the second spring acts on the energy accumulation part to lead the end part of the locking arm to cling to the stop hook. The disengaging force needed by the tripping mechanism is less, and the action of the circuit breaker can be ensured to be reliable.

Description

The tripping mechanism of circuit breaker

Technical field

The present invention relates to circuit breaker, be specifically related to the tripping mechanism of circuit breaker.

Background technology

All be provided with tripping mechanism in the circuit breaker, its effect is when overload current occurring in the circuit, carries out delayed releasing; Or when short circuit current occurring in the circuit, carry out instantaneous trip, make circuit breaker trip, to realize protection to circuit.Comprise in the tripping mechanism that can be rotated a draw bar, the delayed releasing action is generally driven by bimetal leaf, and overload current makes bimetal leaf heating distortion, and its deformation force can promote draw bar and rotate, and then the promotion operating mechanism is threaded off; Instantaneous trip then generally promotes draw bar by electromagnet and rotates.

But in existing circuit breaker, draw bar often directly acts on snap close piece, when draw bar rotates, snap close piece is threaded off.Disclose " break tripping device " so a kind of as Chinese utility model patent ZL200620165140.5, the shortcoming that the release of this structure exists is, the tripping force that needs is bigger, in the less model of electric current, the active force that bimetal leaf or electromagnet produce may be not enough to promote draw bar and rotate, and tripping mechanism is insensitive, the action of circuit breaker is unreliable thereby cause.

Summary of the invention

The technical problem to be solved in the present invention provides the tripping mechanism of the littler circuit breaker of a kind of tripping force.

In order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of tripping mechanism of circuit breaker, comprise draw bar and snap close piece, at least comprise a pivoted arm on the described draw bar, also comprise: lever piece, pivoted arm on one end and the draw bar leans, and the other end is provided with stop hook, and the centre is provided with first rotating shaft; First spring acts on the lever piece, and the pivoted arm on described lever piece and the draw bar is leant; The energy storage part is installed in rotation in second rotating shaft, and the energy storage part is provided with a lockup arm and a trigger arm, and the end of described lockup arm articulates mutually with stop hook on the lever piece, and described trigger arm can contact with snap close piece; Second spring acts on the energy storage part, and the end of lockup arm is abutted against on the stop hook.

The invention has the beneficial effects as follows: the present invention is provided with lever piece and energy storage part between draw bar and snap close piece, bimetal leaf or electromagnet are used on the draw bar with less masterpiece, just can drive the lever piece upset, then can discharge the energy storage part after the lever piece upset, the energy storage part discharges energy stored, and promotes the snap close piece dropout with bigger strength.Therefore, the tripping force that tripping mechanism of the present invention needs is littler, and can guarantee the reliable in action of circuit breaker.

Preferably, described first spring is a stage clip, is pressed on the end of lever piece.

Preferably, described second spring is a torsion spring, is enclosed within second rotating shaft.

Preferably, the back of described lockup arm and stop hook respectively is provided with the inclined-plane.

Description of drawings

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.

Fig. 1 is the tripping mechanism of circuit breaker of the present invention and the annexation schematic diagram of operating mechanism.

Fig. 2 is the tripping mechanism schematic diagram of circuit breaker of the present invention.

Embodiment

As shown in Figure 1 and Figure 2, tripping mechanism of the present invention comprises a draw bar 1, and draw bar 1 can rotate protruding two pivoted

arms

11,12 on the draw bar 1 around axle 9.

The middle part of lever piece 5 is installed in rotation in first rotating shaft 8, one end 51 of lever piece 5 is resisted against on the pivoted arm 11 of draw bar, first spring 2 be pressed in lever piece 5 above, the end 51 of lever piece and the pivoted arm 11 on the draw bar are kept in touch, pivoted arm 11 is held lever piece 5 from below, makes it keep balance.First spring 2 is a stage clip in the present embodiment, if obviously first spring 2 is that a torsion spring that is installed in first rotating shaft 8 also can reach same effect.The other end of lever piece 5 is provided with stop hook 52.

Energy storage part 3 is installed in rotation in second rotating shaft 7, and energy storage part 3 is provided with a lockup arm 31 and a trigger arm 32, and the end of this lockup arm 31 articulates mutually with stop hook 52 on the lever piece.Second spring 6 is torsion springs, be enclosed within second rotating shaft 7, and energy storage part 3 applied clockwise torque, the lockup arm 31 of energy storage part 3 is abutted against on the stop hook 52, stop hook 52 can apply counterclockwise torque to energy storage part 3 by lockup arm 31, therefore, under the breaker closing state, energy storage part 3 keeps the poised state of energy storage.The trigger arm 32 of energy storage part 3 contacts with snap close piece 4.

When overload current occurring in the circuit, the bimetal leaf (not shown) in the circuit breaker occurs bending and deformation, and can promote pivoted arm 11 draw bar 1 is clockwise rotated; Perhaps when short circuit current occurring in the circuit, the electromagnet (not shown) action in the circuit breaker can promote pivoted arm 12 draw bar 1 is clockwise rotated.

When draw bar 1 clockwise rotates, can promote lever piece 5 overturns counterclockwise, the lockup arm 31 of energy storage part 3 is deviate from from stop hook 52, second spring, 6 energy stored discharge, energy storage part 3 is clockwise rotated, the trigger arm 32 of energy storage part 3 can bigger thrust make snap close piece 4 rotate dropout, thereby circuit breaker trip is disconnected.

When pulling handle and make breaker closing, can drive snap close piece 4 and reset, also drive energy storage part 3 simultaneously and rotate counterclockwise, the inclined-plane 33 at lockup arm 31 backs and inclined-plane 53 slide relative at stop hook 52 backs, and lockup arm 31 and stop hook 52 are formed again articulate locking, the tripping mechanism realization resets.

Claims

1. the tripping mechanism of a circuit breaker comprises draw bar (1) and snap close piece (4), comprises a pivoted arm (11) on the described draw bar (1) at least, it is characterized in that also comprising with the lower part:

Lever piece (5), the pivoted arm (11) on one end (51) and the draw bar leans, and the other end is provided with stop hook (52), and the centre is provided with first rotating shaft (8);

First spring (2) acts on the lever piece (5), and the pivoted arm (11) on described lever piece (5) and the draw bar is leant; Energy storage part (3), be installed in rotation in second rotating shaft (7), energy storage part (3) is provided with a lockup arm (31) and a trigger arm (32), and the end of described lockup arm (31) articulates mutually with stop hook (52) on the lever piece, and described trigger arm (32) can contact with snap close piece (4);

Second spring (6) acts on the energy storage part (3), and the end of lockup arm (31) is abutted against on the stop hook (52).

2. the tripping mechanism of circuit breaker according to claim 1, it is characterized in that: described first spring (2) is a stage clip, is pressed on the end of lever piece (5).

3. the tripping mechanism of circuit breaker according to claim 1, it is characterized in that: described second spring (6) is a torsion spring, is enclosed within second rotating shaft (7).

4. the tripping mechanism of circuit breaker according to claim 1, it is characterized in that: the back of described lockup arm (31) and stop hook (52) respectively is provided with the inclined-plane, when pulling handle and make breaker closing, inclined-plane (53) slide relative at the inclined-plane (33) at lockup arm (31) back and stop hook (52) back, and lockup arm (31) and stop hook (52) are formed again articulate locking.