CN1020827C - Circuit breaker auxiliary switch assembly - Google Patents

Abstract

A circuit breaker auxiliary switch structure characterized by a contact arm carrying a first contact movable between open and closed positions. An auxiliary switch is disposed in the path of movement of the contact arm and operable to open or close an auxiliary circuit associated with a circuit breaker.

Description

Circuit breaker auxiliary switch assembly

The auxiliary switch structure that the present invention relates to circuit breaker with and special internal mechanism.

Auxiliary switch comprises and is installed in the circuit breaker and driven " often opening " and/or " normally closed " contact when circuit breaker is opened or be closed, common switch is with little one pole, double-throw, the form of quick-action switch, it has " often opening " and " normally closed " contact in Shell of circuit breaker.When needs showed whether circuit breaker is opened or be closed, auxiliary switch was connected in the control circuit.For example, the vision indication to provide to show circuit supply on the distribution board often is provided indicator light.Fashionable when circuit breaker closing, indicator light will be lighted.Perhaps, in practice, it is bright that the fashionable indicator light of circuit breaker closing (red) is worked as in hope, and another indicator light (green) is bright when circuit breaker is opened.

The existing structure of auxiliary switch is because too much parts relate to the frequent high tolerance of regulating of requirement and the comparison costliness.

The present invention includes an auxiliary switch for circuit breaker structure, it comprises the shell of an electric insulation, a circuit breaker in the enclosure; And first and second contacts that can between the open and close position, move, one at initial position and removable so that the relieving mechanism that contact is opened when the dropout position is got back in release, the first contact transmission arm moves between the open and close position of contact, auxiliary switchgear is used for opening when arm is driven or closed auxiliary circuit on the motion path of arm.

Useful is that this switching device comprises a framework, a plunger that is slidably mounted on the framework; One on framework and with the plunger engage switch; When arm moves to when opening contact position, switch is driven.

The advantage of auxiliary switch of the present invention is that it not only comprises the parts of minimum number and does not need adjusting.And the switch assembling adopts plug-in type to install.

Now by way of example, present invention is described with reference to accompanying drawing, wherein:

Fig. 1 is a partial section that the circuit breaker of auxiliary switch has been installed in expression;

Fig. 2 is a front view of another embodiment of the present invention.

Such circuit breaker is in US Patent No 4,713, and is open in 504 the specification, and comprises that a plurality of utmost points, every utmost point comprise the electric arc and the main contact arm of a plurality of parallel spaced apart, for for simplicity, only describe the situation of electric arc and main contact arm at this.

Fig. 1 represents a molded case circuit breaker 10, and it comprises an outer casing base 12 and a lid 14.Base and lid are assembled on the cut-off rule 16 and constitute an inner room that breaker apparatus is installed, and this circuit breaker comprises decides main contact 18 and moving main contact 20.Fixed and moving arcing contact 19 and 21 also are set respectively simultaneously.Decide contact 18 and 19 be installed in one can with conductor 22 that bus or terminal link to each other on.

Moving main contact 20 is installed on the contact transmission arm 26 and moving arc contact 21 is installed on the arc contact transmission arm 26a.These arms are installed on the contact arm support 28 rotationally at rotating shaft 27 places.At rotating shaft 49 places, the contact arm support is loaded on the underframe 30 rotationally.Elastic conductor or 32 extend on the conductor 34 that links to each other with conductor 36 from arm 26 along separate routes, conductor 36 can link to each other with a terminal (not shown).Though circuit extends to the load end (not shown) from the line scan pickup coil side (not shown) by several parts 22,18,20,26,32,34 and 36, circuit breaker also can move under the situation of current opposite in direction.In order more intactly to describe the operation of circuit breaker, can be with reference to US Patent No 4,656,444 specification.

An operating mechanism (ordinary representation is at 40 places) is by adopting conventional toggle device open and close contact, and this toggle device comprises that rotation is interconnected in following elbow connection rod 42 and the last elbow connection rod 44 in the rotating shaft 48.This time elbow connection rod is a fulcrum with 27 on rotary bracket 50, and carriage 50 is a fulcrum with 49 then.

Opening of contact 18,20 is that handle 54 by operating mechanism 40 is finished, or the overcurrent situations that response occurs in circuit is finished by automatic trip.In the contact closure position, contact arm support 28 places solid line position (Fig. 1), and at trip position, support 28 is in dotted line position 28a.Carriage 50 links to each other with cross bar 56.Thereby the contact arm support in the consecutive roots unit of this cross bar and multipole circuit breaker interconnection open and close simultaneously is similar to the respective contacts of contact 18,20.Therefore, dividing or closing when moving between the position when operating mechanism 40 drives contact arm 26, the contact arm in the consecutive roots of circuit breaker is also correspondingly moved by operating mechanism.

According to the present invention, auxiliary switch 60 is installed on the casing frame parts (not shown) in extremely of one of contact arm support 28 top.This auxiliary switch comprises 62, one driving mechanisms of a framework or inserted link 64, and one or more microswitch 66,68.Framework 62 comprises a pair of claw shaped element 70, and this claw shaped element is used for being meshed with the framework 72 of outer casing base 12.

Microswitch 66,68 is contained on the framework 62 regularly, and each switch has a shift knob 74 and driving mechanism or bar 76, and this driving mechanism or bar 76 are loaded on 78 and extend to the top of the shift knob 74 that can depress rotationally.Inserted link 64 is contained on the framework 62 and by a pair of similar notch 79 slidably to be formed, and the outer end of bar 76 is arranged in this notch.

The bottom of inserted link 64 comprises a claw shaped element with end 80, this end 80 under its normal condition with respect to the direction of motion horizontally set of inserted link.Open when contact 18,20, contact arm support 28 moves to dotted line position 28a, and the end 80 of contact arm support bump inserted link is upwards slided inserted link there, and the upper part of inserted link moves to dotted line position 64a place thereupon.Simultaneously, the bar 76 depress switch button 74 that also moves upward is in Chang Kai or normally closed microswitch 66,68 energisings or outage to give.

More specifically be, the end portion that comprises end 80 of inserted link 64 is partly flexible, thereby it can be deformed to dotted line position 28a during switch arm 28 motions.An advantage of the slight flexibility of end 80 is its its any stroke of crossing when can compensating switch arm 28 opening at first.

An alternative embodiment of the invention is shown in Fig. 2, and wherein identical parts are represented with same numeral.In Fig. 2, auxiliary switch 60 comprises a lengthening inserted link 82, and inserted link 82 has the notch 84 that separates, and the outer end portion of bar 76 just inserts in the notch.The end portion of inserted link 82 has a semispherical surface 86 and is used for engaging when position shown in switch arm 28 rises to, bar 76 motions thereby inserted link 82 rises.Therefore, with inserted link 64(Fig. 1) bottom 80 different, inserted link 82(Fig. 2) have an inflexible end, and upper and lower simply motion in response to the motion of switch arm 28.

Therefore, device of the present invention provides a kind of auxiliary switchgear with minimal components quantity, it does not require high tolerance and the time does not need to regulate in assembling, and Chang Kai or normally closed microswitch are for handling red light on the distribution board or green light to show that circuit breaker is to be in to open or closed position is useful.

Claims (4)

1, a circuit breaker comprises an electric insulation shell, first and second contacts that can between the open and close position, operate, a relieving mechanism moves when being discharged into the dropout position to open contact, one first contact transmission arm can move between the open and close position of contact, and comprise that further auxiliary switchgear is used for opening or closed auxiliary circuit when arm is driven, it is characterized in that: auxiliary switchgear comprises a microswitch, this microswitch has a drive rod and an inserted link and the engagement of above-mentioned arm, this inserted link has a notch makes drive rod and its engagement, wherein microswitch is installed on the framework, and inserted link is to be installed on the framework movably.

2, circuit breaker according to claim 1 is characterized in that above-mentioned inserted link can install slidably.

3, circuit breaker according to claim 2 is characterized in that: when arm moves to driving switch when opening contact position.

4, circuit breaker according to claim 3 is characterized in that: above-mentioned inserted link comprises the flexible portion of a bending when arm is crossed stroke.

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