CN1452204A

CN1452204A - Mechanism for operating small circuit breaker

Info

Publication number: CN1452204A
Application number: CN 02111407
Authority: CN
Inventors: 潘祁阳
Original assignee: ZHENGTAI GROUP CORP
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2002-04-16
Filing date: 2002-04-16
Publication date: 2003-10-29
Anticipated expiration: 2022-04-16
Also published as: CN1215515C

Abstract

A manipulating mechanism for miniature breaker is characterized by that its jumper and contact arm are two-step boosting lever. Regulating their lever ratios can conveniently regulate the moving speed between contacts and the action force between jumper and lock for optimal match. A slotted cam mechansm is used to control the movement tracings of jumper and moving arm with low friction force.

Description

A kind of operating mechanism of miniature circuit breaker

Technical field

The present invention relates to a kind of operating mechanism of miniature circuit breaker.

Background technology

The operating mechanism of existing miniature circuit breaker, disclosed as Chinese patent ZL88103427 " a kind of operating mechanism of miniature circuit breaker ", a pair of fixed contact and moving contact are housed in the enclosure, moving contact links to each other with one four connecting rod operating mechanism by contact arm, closes a floodgate or trips by the handle action.Operating mechanism also is provided with tripgear, and it comprises thermal overload device and/or an electromagnetic trip device that has striker of a band bimetal leaf, produces the tripping operation action when circuit overload or short circuit, plays a protective role.The structure of above-mentioned miniature circuit breaker is well-known, and its advantage also is obvious, has less tripping force and is easy to obtain excellent contact pressure.However, this improvement also is very limited.

Summary of the invention

What the present invention will solve is that the tripping force when improving contact pressure that has the operating mechanism structure of miniature circuit breaker now does not reach enough little problem yet, a kind of operating mechanism of follow-on miniature circuit breaker is provided, makes contact under acquisition excellent contact pressure condition, further improve breaking capacity and reduce tripping force.The technical scheme that addresses the above problem employing is: a kind of operating mechanism of miniature circuit breaker, comprise an operating grip, handle back-moving spring, be oppositely arranged in the enclosure fixed contact and moving contact, described fixed contact is fixed in the described shell by quiet arm, it is characterized in that also being provided with:

----kinematic link, an end is eccentrically set on the described handle, and the other end links to each other with tripping, and described tripping and snap close form a mechanical chain that disconnects that has nothing to do with operating grip;

----trip gear that acts on described snap close comprises that a band thermal release device of bimetal leaf and/or one have push rod and vertically arranged electromagnetic tripping apparatus.

----flute profile cam and a pushing block that is arranged on the described cam, the lower end of described pushing block is hinged by rotating shaft and described tripping;

----swing arm in hinged described pushing block upper end rotating shaft, described swing arm has the first arm and one second arm of fixing described moving contact,

----repulsion torsion spring is arranged between described swing arm and the pushing block, makes described swing arm be subjected to a moment that deviates from described fixed contact direction;

----one makes described swing arm be subjected to an adhesive torsion spring towards the moment of described fixed contact direction; One end of described adhesive torsion spring is fixed on the shell, and the other end is a smooth cantilever, and acts on second arm of described swing arm.

Described tripping and swing arm are designed to the raising speed lever.

Described rotating shaft is provided with roller.

The groove cam constitutes by two sections: it is the circular arc in the center of circle with snap close point A that hypomere is one section; Epimere is a plumb line.

Described tripping bottom is provided with a boss.

Also be provided with the indicating device that shows contact " closure " or " disconnection " state on the described shell, described indicating device is hinged by push pedal and rotating shaft.

The cantilever of described adhesive torsion spring increases gradually near terminal slope.

The cantilever of described adhesive torsion spring is made of two sections straight lines and middle one section circular arc.

When second arm of described swing arm turned to the latter end straight line of described adhesive torsion spring, both maintenances were vertical substantially.

The first arm of described swing arm and quiet arm are substantially parallel when contact closure.

The characteristics of operating mechanism of the present invention are:

Two-stage raising speed lever is made in tripping and contact arm, regulate the lever ratio of two-stage lever, can regulate the movement velocity between the contact very easily and regulate tripping and snap close between active force, make it to reach best fit, make contact under acquisition excellent contact pressure condition, further improve breaking capacity and reduce tripping force.

Utilize the movement locus of control tripping of flute profile cam mechanism and swing arm.The flute profile cam mechanism adopts roller to move in the flute profile cam groove, and frictional resistance is little, the operation light and flexible.

Other advantage of the present invention and characteristic can be seen clearlyer from the embodiment of specification, and this embodiment is just as nonrestrictive example.

Description of drawings

The invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is the structural representation of circuit breaker operating mechanism of the present invention when being in closure state.

Fig. 2 is the structural representation of circuit breaker operating mechanism of the present invention when being in off-state.

Fig. 3 is the structural representation of circuit breaker operating mechanism of the present invention when being in the fault trip state.

Fig. 4 is the structural representation of contact apparatus of the present invention.

Embodiment

With reference to accompanying drawing, operating mechanism of the present invention comprises an operating grip 32 and a handle back-moving spring 34, the fixed contact 5 and the moving contact 6 of the pair of opposing of dress in the shell 31, and fixed contact 5 is fixed in the shell 31 by quiet arm 4.Kinematic link 33 1 ends are eccentrically set on the handle 32, and the other end links to each other with tripping 19, and tripping 19 forms a mechanical chain that disconnects that has nothing to do with operating grip 32 with snap close 27.Groove cam 21 constitutes by two sections: it is the circular arc in the center of circle with snap close point A that hypomere is one section, makes snap close point A position stability in the closed procedure process; Epimere is a plumb line, can guarantee better that moving contact 6 has suitable sliding friction with fixed contact 5 in excess of stroke course of action, improve the contact performance of contact.Flute profile cam 21 is provided with pushing block 20, and the lower end of pushing block 20 is hinged by rotating shaft 22 and tripping 19, and the upper end is hinged by rotating shaft 8 and swing arm 17.Flute profile cam 21 is by the movement locus of pushing block 20 control trippings 19 and swing arm 17.Pushing block 20 moves in flute profile cam 21 by the roller 23 that is installed in above rotating

shaft

22 and 8.

Swing arm 17 has fixedly the first arm 7 and one second arm 16 of moving contact 6, is provided with a repulsion torsion spring 9 between swing arm 17 and pushing block 20, and under the effect of this repulsion torsion spring 9, swing arm 16 is subjected to a moment that deviates from fixed contact 5 directions; Also be provided with an adhesive torsion spring 10 in the shell 31, an end 11 of adhesive torsion spring 10 is fixed on the shell 31, and the other end is a smooth cantilever 12, and acts on second arm 16 of swing arm 17; Under these adhesive torsion spring 10 effects, swing arm 17 is subjected to the moment towards fixed contact 5 directions.Adhesive torsion spring 10 and repulsion torsion spring 9 act on the swing arm 17 simultaneously, and the moment of torsion that adhesive torsion spring 10 acts on the swing arm 17 acts on moment of torsion on the swing arm 17 greater than repulsion torsion spring 9.The cantilever 12 of adhesive torsion spring is made of two sections

straight lines

13,15 and middle one section circular arc 14, and slope ratio leading portion straight line 13 slopes of latter end straight line 15 are much bigger, making swing arm make its second arm 16 of time spent at big electrodynamic repulsion force has an accelerated motion when cantilever 12 moves, reach the effect of rapid break contact.And when second arm 16 of swing arm turned to the latter end straight line 15 of adhesive torsion spring, both maintenances were vertical substantially, make contact be locked in off-state.

The first arm 7 of swing arm 17 and quiet arm 4 are substantially parallel when contact closure, make swing arm can obtain a bigger electric repulsion, the effect of quick break contact when utilizing this electric repulsion to reach short circuit.

The hinged support of kinematic link 33 and tripping 19 is positioned at a side of close pushing block 20 in the tripping, and the first arm 7 length of swing arm 17 are greater than second arm 16, in fact, tripping 19 has constituted one group respectively with connecting rod 33 and the tie point 35 of tripping 19 and the two-stage raising speed leverage that rotating shaft 8 is fulcrum with swing arm 17, makes contact obtain bigger movement velocity.And with regard to the tripping force analysis, tripping 19 be the speed ratio that rises higher subtract the power lever, can obtain less tripping force.

The tripping bottom is provided with a boss C, accelerates the movement velocity of tripping 19 in the fault trip process.

With reference to Fig. 1,2, the closed procedure of operating mechanism:

Clockwise direction turning handle 32 (from Fig. 2 position to Fig. 1 position), the off-centre of handle 32 drive the upwards swing of upper end of kinematic link 33, and kinematic link 33 pulling tripping 19 right-hand member liftings also promote pushing block 20 and move upward.The swing arm 17 that is fixed in the rotating shaft 8 moves upward thereupon, but second arm 16 of swing arm is owing to can't be lifted by the effect of adhesive torsion spring 10 at this moment, force moving contact 6 to do counterclockwise to rotate when rising, moving contact 6 approaches fixed contact 5 fast, realizes circuit breaker " closure ".After the contact closure, pushing block 20 still continues to promote swing arm 17 and moves upward, and impels second arm 16 of swing arm 17 to raise and lifts the cantilever 12 of adhesive torsion spring 10, and generation moves clockwise, and realizes contact " excess of stroke ".The excess of stroke is to suitable requirement, and handle 32 approaches to the right side extreme position, and kinematic link 33 is crossed dead point, operating mechanism self-locking.

The opening operation of operating mechanism:

When counter clockwise direction turning handle 32, (from Fig. 1 position to Fig. 2 position), operating mechanism will be realized above-mentioned opposite motion, i.e. circuit breaker " disconnection ".In the opening operation process, because the effect of handle back-moving spring 34, after handle 32 was operated the dead point, handle 32 can return to extreme position voluntarily.Operating mechanism after the disconnection remains on the mechanical chain state.

With reference to Fig. 3, when circuit overloads, the bimetal leaf 26 of thermal release device is subjected to overheated skew left, drives snap close 27 and does counter-clockwise direction deflection around the B point, makes mechanical chain disconnect the operating mechanism automatic trip.

When serious overload of circuit or short circuit, the push rod 28 of electromagnetic tripping apparatus will promote the horizontal arm of snap close 27 rapidly under the effect of electromagnetic force, and moment disconnects mechanical chain.After the chain disconnection, push rod 28 continues to hit by snap close 27 the boss C of tripping 19, accelerates the movement velocity of tripping 19.This moment, the first arm 7 of swing arm 17 moved down in the acting in conjunction deflect of adhesive torsion spring 10 and repulsion torsion spring 9, and moving contact 6 and fixed contact 5 are disconnected, and realized that operating mechanism trips voluntarily.Handle 32 is made counter-clockwise direction and is rotated under back-moving spring 34 effects, and realizes buckleing by connecting rod 33 drive trippings 19 again, and mechanism has rebulid mechanical chain automatically.

The indicating device 29 that shows the contact service position is hinged by push pedal 30 and rotating shaft 8, is one and fixedlys connected with the contact service position is corresponding.

Claims

1, a kind of operating mechanism of miniature circuit breaker, comprise an operating grip (32), a handle back-moving spring (34), be oppositely arranged in the enclosure fixed contact (5) and moving contact (6), described fixed contact (5) is fixed in the described shell (31) by quiet arm (4), it is characterized in that also being provided with:

A----kinematic link (33), an end are eccentrically set on the described handle (32), and the other end links to each other with tripping (19), and described tripping (19) forms a mechanical chain that disconnects that has nothing to do with operating grip (32) with snap close (27);

----trip gear that acts on described snap close (27) comprises that the thermal release device of a band bimetal leaf (26) and/or one have push rod (28) and vertically arranged electromagnetic tripping apparatus.

A----flute profile cam (21) and a pushing block (20) that is arranged on the described cam (21), the lower end of described pushing block (20) is hinged by rotating shaft (22) and described tripping (19);

----one is hinged on the swing arm (17) in described pushing block (20) the upper end rotating shaft (8), and described swing arm (17) has the first arm (7) and one second arm (16) of fixing described moving contact (6);

A----repulsion torsion spring (9) is arranged between described swing arm (17) and the pushing block (20), makes described swing arm (17) be subjected to a moment that deviates from described fixed contact (5) direction;

----one makes described swing arm (17) be subjected to an adhesive torsion spring (10) towards the moment of described fixed contact (5) direction; One end (11) of described adhesive torsion spring (10) is fixed on the shell (31), and the other end is a smooth cantilever (12), and acts on second arm (16) of described swing arm (17).

2, the operating mechanism of miniature circuit breaker as claimed in claim 1 is characterized in that described tripping (19) and swing arm (17) are designed to the raising speed lever.

3, the operating mechanism of miniature circuit breaker as claimed in claim 2 is characterized in that described rotating shaft (22,8) is provided with roller.

4, the operating mechanism of miniature circuit breaker as claimed in claim 3 is characterized in that described tripping (19) bottom is provided with a boss (C).

5, the operating mechanism of miniature circuit breaker as claimed in claim 4 is characterized in that described groove cam (21) constitutes by two sections: it is the circular arc in the center of circle with snap close point A that hypomere is one section; Epimere is a plumb line.

6, the operating mechanism of miniature circuit breaker as claimed in claim 5 is characterized in that also being provided with on the described shell indicating device (29) that shows contact " closure " or " disconnection " state, and described indicating device (29) is hinged by push pedal (30) and rotating shaft (8).

7,, it is characterized in that ((12) increase gradually near terminal slope for the cantilever of described adhesive torsion spring (10) as the operating mechanism of any one described miniature circuit breaker of claim 1～5.

8, the operating mechanism of miniature circuit breaker as claimed in claim 7 is characterized in that the cantilever (12) of described adhesive torsion spring (10) is made of two sections straight lines (13,15) and middle one section circular arc (14).

9, the operating mechanism of miniature circuit breaker as claimed in claim 8 is characterized in that both maintenances are vertical substantially when second arm (16) of described swing arm (17) turns to the latter end straightway (15) of described adhesive torsion spring (10).

10, the operating mechanism of miniature circuit breaker as claimed in claim 9 is characterized in that described swing arm (17) and second arm (16) and quiet arm (4) are substantially parallel when contact closure.