CN201514908U

CN201514908U - Electromagnetic tripping device of low-voltage circuit breaker

Info

Publication number: CN201514908U
Application number: CN200920048505XU
Authority: CN
Inventors: 朱未东; 江长生; 张海燕; 宗伟光
Original assignee: JIANGSU HUINENG ELECTRIC CO Ltd
Current assignee: JIANGSU HUINENG ELECTRIC CO Ltd
Priority date: 2009-10-23
Filing date: 2009-10-23
Publication date: 2010-06-23
Anticipated expiration: 2019-10-23

Abstract

The utility model discloses an electromagnetic tripping device of a low-voltage circuit breaker, which comprises a bimetallic strip, a magnetic yoke and a current carrying part which are respectively fixed on a bracket, wherein the magnetic yoke has a U-shaped structure, is positioned at the upper part of the bracket and envelopes part of the bimetallic strip and the current carrying part; an armature is arranged in front of the opening of the U-shaped structure of the magnetic yoke; two legs extending out from the lower part of the armature are connected with the bracket in a pivoting way; the bracket is provided with a slot on the longitudinal front wall; the leg of the armature is provided with at least one groove in an extending way; and one end of a spring is fixed at the slot, and the other end thereof is fixed at the groove. The electromagnetic tripping device is integrally exquisite, saves the inner space of the low-voltage circuit breaker, and has easy processing and simple assembly of all parts.

Description

A kind of electromagnetic tripping apparatus of low-voltage circuit breaker

Technical field

The utility model relates to a kind of low-voltage circuit breaker, relates in particular to its electromagnetic tripping apparatus, is the tripping operation execution unit of low-voltage circuit breaker.

Background technology

Low-voltage circuit breaker is a kind of protection electrical equipment of main circuit, when detecting the overcurrent of main circuit system, makes its trip unit produce the action of threading off, and plays effects such as Circuits System in the protection main circuit and each parts are not impaired.Trip unit comprises the magnetic tripping mechanism, and the magnetic tripping mechanism is made up of armature, yoke, spring, support, current-carrying part etc., and existing armature is offered through hole usually with the both sides bending symmetrically at two bending parts, and the top is provided with upwardly extending actuator lever.Add man-hour, support bilateral symmetry at the metal material of processing and forming is offered through hole, the support both sides are simultaneously with armature two bending envelopes, and the through hole in armature two bendings is all corresponding with through hole on the support both sides, join armature is compatible with support thereby be convenient to through hole that through hole that bolster offers by the support both sides respectively and armature bending offer, make armature to be bearing on the support rotatably around bolster.In the electromagnetic tripping apparatus of this structure, the armature both sides need bending, also need offer through hole, are not easy to the processes of armature, and support needs the through hole of folding surface both sides correspondingly with the through hole of armature two bending parts to pass to hold bolster, make assembling loaded down with trivial details, time-consuming.

Summary of the invention

The purpose of this utility model be to provide a kind of simple in structure, part processing convenient and armature and support between the two can be quick, the electromagnetic tripping apparatus of the low-voltage circuit breaker of easy reliable assembling.

The technical solution adopted in the utility model is, comprises that bimetal leaf, yoke and current-carrying part are separately fixed on the support, and yoke is a U type structure, is positioned at the top of support, and the part of envelope bimetal leaf and current-carrying part; Before the U of yoke type structural openings, an armature is set, two pin that extend armature bottom connection support that can pivot; Support is having a groove on the antetheca longitudinally, extends at least one groove is set on the pin of armature, and spring one end is fixed on the groove position, and the other end is fixed on the groove location place.

The utility model is whole exquisite, has saved the space in low-voltage circuit breaker; Each part is easily processed and is assembled simple.

Description of drawings

Fig. 1 is a stereogram of the present utility model.

Fig. 2 is the structure chart of Fig. 1 medium-height trestle 11.

Fig. 3 is the structure chart of armature 14 among Fig. 1.

Among the figure: 11. supports; 12. current-carrying part; 13. spring; 14. armature; 15. yoke; 16. bimetal leaf; 17. adjustment screw; 18. air gap; 111,112. holes; 113. projection; 114 grooves; 115 holes; 141,142 pin; 143 grooves.

Embodiment

As Fig. 1-3, bimetal leaf 16, yoke 15 and 12 3 parts of current-carrying part are separately fixed on the support 11, and yoke 15 is U type structure and the top that is positioned at support 11, the part of yoke 15 envelope bimetal leafs 16 and current-carrying part 12.Before the U of yoke 15 type structural openings, an armature 14 is set, form the air gap 18 between armature 14 and the yoke 15.Armature 14 bottoms are extended with two pin 141,142, pin 141,142 respectively with support 11 on two holes having of lateral symmetry 111,112 cooperate, promptly armature 14 is bearing on the support 11 with the axle at pin 141,142 places, and armature 14 can freely be pivoted.

Support 11 horizontal sidewalls are provided with a projection 113 that adjustment screw 17 can be installed, and support 11 has the hole 115 of yoke of being used for fixing 15 on its rear wall, and support 11 is having a groove 114 on the antetheca longitudinally.On the pin 141 of armature 14, extend at least one groove 143 is set, spring 13 1 ends fixedly hang on the groove 143, the other end is fixed on groove 114 places of support 11, also can be fixed on other relative position place, as on other position of support 11 or the current-carrying part 12 or the like.Adjustment screw 17 is in the maximal clearance that can limit under the effect of spring 13 between armature 14 and the yoke 15.When spring 13 hangs over different grooves 143, can produce different spring tensions, have only when electromagnetic attraction could adhesive armature 14 during greater than spring tension, armature 14 is rotated to the yoke direction, armature 14 can hit actuator near the one side of yoke 15 in the rotation process, operating mechanism is threaded off, realize the tripping operation of circuit breaker, the size of electromagnetic attraction is decided by to flow through the size of current of this electromagnetic tripping apparatus, so, corresponding different drop-away current when spring 13 connects with different groove 143, the electromagnetic attraction of generation makes the operating mechanism dropout, therefore, different grooves 143 connects and can realize that the circuit breaker tripping current value is adjustable on spring 13 and the armature 14.

Armature 14 is variable-air-gaps that produce electromagnetic attraction with the air gap 18 of yoke 15, in the process of armature 13 adhesives, diminish gradually, by the same current size time, air gap is big more, electromagnetic attraction is more little, so, when circuit breaker current one timing, for guaranteeing that electromagnetic attraction can should be provided with this air gap 18 with armature 14 and yoke 15 reliable adhesives.The utility model is by installing adjustment screw 17 on the projection on the support 11 113, and match initial air gap between incompatible restriction armature 14 and the yoke 15 of spring 13, and simultaneously, adjustment screw 17 is adjustable, the air gap between scalable armature 14 and the yoke 15.

Claims

1. the electromagnetic tripping apparatus of a low-voltage circuit breaker, comprise that bimetal leaf (16), yoke (15) and current-carrying part (12) are separately fixed on the support (11), it is characterized in that: yoke (15) is a U type structure, be positioned at the top of support (11), and the part of envelope bimetal leaf (16) and current-carrying part (12); Before the U type structural openings of yoke (15) armature (14) is set, two pin (141,142) that extend armature (14) bottom can pivot and connect support (11); Support (11) is having a groove (114) on the antetheca longitudinally, goes up to extend at the pin (141) of armature (14) at least one groove (143) is set, and spring (13) one ends are fixed on groove (114) position, and the other end is fixed on groove (143) position.

2. the electromagnetic tripping apparatus of a kind of low-voltage circuit breaker according to claim 1, it is characterized in that: the horizontal sidewall of support (11) is provided with the projection (113) that adjustment screw (17) can be installed.