CN211320034U

CN211320034U - Tripping pull rod and overload tripping mechanism of circuit breaker

Info

Publication number: CN211320034U
Application number: CN201922188688.1U
Authority: CN
Inventors: 徐�明; 王慧德
Original assignee: Xiamen Guoyan Technology Co ltd
Current assignee: Xiamen Guoyan Technology Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-08-21
Anticipated expiration: 2029-12-09

Abstract

The utility model discloses an overload tripping device of dropout pull rod and circuit breaker, the one end of this dropout pull rod forms the portion of colluding of buckling, and the other end forms the U-shaped curved portion, forms the actuating arm between the both ends of this dropout pull rod. The utility model provides an overload tripping device of circuit breaker, includes dropout pull rod, bimetallic strip and take off the fastener, the portion of colluding of buckling of dropout pull rod and the kerve of taking off the fastener collude, two arms of the U-shaped bight of dropout pull rod correspond the sliding connection with two guide slots on the circuit breaker casing respectively, and the bimetallic strip is arranged in one side of this actuating arm and can be supported this actuating arm by the deformation top of bimetallic strip, and then drives the dropout pull rod pulling and take off the fastener and carry out the dropout. It has the following advantages: the occupied space is small, the assembly efficiency is improved, and the stability of the performance of the overload tripping mechanism is ensured.

Description

Tripping pull rod and overload tripping mechanism of circuit breaker

Technical Field

The utility model relates to a circuit breaker field especially relates to an overload tripping device of dropout pull rod and circuit breaker.

Background

The overload trip mechanism of the miniature circuit breaker mainly comprises a bimetallic strip, a trip pull rod, a locking piece (a trip piece) of a contact mechanism and a trip piece. The main function is that when the circuit breaker generates overload current, the abnormal heating bending deformation of the bimetallic strip drives the tripping pull rod to pull the locking piece of the mechanism to trip. Therefore, the position consistency and the motion resistance consistency of the tripping pull rod and the position form consistency after the mechanism is switched on each time have great influence on the stability of the overload protection characteristic of the circuit breaker.

Patent application No. 201920392706.5 provides a circuit breaker overload tripping device, the slip joint of the spout of the dropout pull rod among this tripping device and casing only adopts the sliding fit of a pin and a spout, this cooperation structure makes the dropout pull rod still can the slope appear, the condition of rocking, the touching point that leads to bimetallic strip and dropout pull rod and dropout fastener draw-out groove changes, lead to transshipping the dropout characteristic unstable, and be difficult to the lid assembly of closing of circuit breaker, influence assembly efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model provides an overload tripping device of dropout pull rod and circuit breaker, it has overcome in the background art the not enough of prior art.

The utility model provides a technical scheme that its technical problem adopted is:

a tripping pull rod is characterized in that one end of the tripping pull rod is provided with a bent hook part, the other end of the tripping pull rod is provided with a U-shaped bent part, and a driving arm which can be acted by external force to drive the tripping pull rod to have motion orientation is formed between the two ends of the tripping pull rod.

In one embodiment: the plane of the two arms of the U-shaped bending part forms an included angle with the plane of the bending hook part.

In one embodiment: the included angle is a right angle.

In one embodiment: the driving arm is a U-shaped arm, and the U-shaped arm and the bent hook part are in the same plane.

In one embodiment: the tripping pull rod is formed by folding round steel wires.

The utility model provides an overload tripping device of circuit breaker, includes foretell dropout pull rod, bimetallic strip and takes off the fastener, should take off the fastener and have an kerve, the portion of colluding of buckling of this dropout pull rod and the kerve of taking off the fastener collude, be equipped with two guide slots on this circuit breaker casing, two arms of the U-shaped curved portion of this dropout pull rod correspond the sliding connection with these two guide slots respectively, this bimetallic strip arranges one side of this actuating arm in and can be supported this actuating arm by the deformation top of bimetallic strip, and then drive the dropout pull rod pulling take off the fastener and trip.

In one embodiment: the two guide grooves are in a shape of a Chinese character 'shan'.

Compared with the background technology, the technical scheme has the following advantages:

1. the tripping pull rod and the shell are correspondingly in sliding connection with the two sliding grooves of the shell through the two arms of the U-shaped bent part, so that the position stability of the tripping pull rod at a working position is ensured, and the unstable overload tripping characteristic caused by the change of the contact points of the bimetallic strip and the tripping pull rod and the arc-shaped groove of the locking piece due to the inclination of the tripping pull rod can be avoided.

2. The overload tripping mechanism of the tripping pull rod occupies small space, and more available space is made for a main loop.

3. The assembly is good, and dropout pull rod one end is spacing by the kerve of taking off the fastener, and the other end is spacing by the two guide slots of casing, and easy counterpoint when the casing upper cover can not take place to incline, rotatory etc. because of the dropout pull rod and lead to closing the lid difficulty to improve assembly efficiency.

4. The tripping pull rod is ingenious and novel in structural design, and is particularly suitable for the overload tripping mechanism of the circuit breaker.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a trip rod.

Fig. 2 is a schematic structural diagram of an overload trip mechanism of a circuit breaker.

Detailed Description

Referring to fig. 1, in a trip rod, one end of the trip rod 1 forms a bent hook 10, and the other end forms a U-shaped bent portion 20, and a driving arm 30, which can be acted by an external force to drive the trip rod to have a motion orientation, is formed between two ends of the trip rod 1. In this embodiment, the bending angle of the bending hook 10 is 90 degrees.

The plane of the two arms of the U-shaped bent portion 20 and the plane of the bent hook portion 10 form an included angle. In this embodiment, the included angle is a right angle.

In this embodiment, the driving arm 30 is a U-shaped arm, and the U-shaped arm and the bent hook 10 are in the same plane.

Referring to fig. 2, an overload trip mechanism of a circuit breaker includes the above-mentioned trip rod 1, a bimetal 2 and a trip piece 3, the trip piece 3 has a slot 31, a bent hook 10 of the trip rod 1 is hooked with the slot 31 of the trip piece 3, two guide slots 101 are provided on a casing of the circuit breaker, two arms of a U-shaped bent portion 20 of the trip rod 1 are respectively in sliding connection with the two guide slots 101, the bimetal 2 is disposed at one side of the driving arm 30 and can be pushed against the driving arm 30 by an overload deformation of the bimetal 2 to drive the trip rod 1 to pull the trip piece 3 to trip.

Preferably, the tripping rod 1 is formed by folding a round steel wire, and the friction force between the round steel wire and the guide groove 101 is small, so that the sliding resistance of the tripping rod 1 is small, and the sliding is smooth.

The two guide grooves 101 are shaped like a Chinese character 'shan', and two arms of the U-shaped bent portion 20 are seated in grooves at both sides of the Chinese character 'shan'.

Two arms of the U-shaped bent part 20 of the tripping pull rod 1 are limited in the two sliding grooves 101, so that the tripping pull rod 1 is not easy to turn over, incline and the like, and is ensured to be in a stable and difficult-to-shake state all the time, thereby ensuring the tripping performance of the tripping pull rod 1.

The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims

1. A tripping pull rod is characterized in that: one end of the tripping pull rod forms a bent hook part, the other end forms a U-shaped bent part, and a driving arm which can be acted by external force to drive the tripping pull rod to have motion orientation is formed between the two ends of the tripping pull rod.

2. The trip bar of claim 1, wherein: the plane of the two arms of the U-shaped bending part forms an included angle with the plane of the bending hook part.

3. The trip bar of claim 2, wherein: the included angle is a right angle.

4. The trip bar of claim 1, wherein: the driving arm is a U-shaped arm, and the U-shaped arm and the bent hook part are in the same plane.

5. A trip bar according to any one of claims 1 to 4, wherein: the tripping pull rod is formed by folding round steel wires.

6. An overload trip mechanism of a circuit breaker, comprising the trip rod, the bimetallic strip and the trip piece according to any one of claims 1 to 5, wherein the trip piece has a slot, the bent hook portion of the trip rod is hooked with the slot of the trip piece, two guide slots are provided on the circuit breaker housing, two arms of the U-shaped bent portion of the trip rod are respectively in sliding contact with the two guide slots, the bimetallic strip is disposed on one side of the driving arm and can be abutted against the driving arm by the deformation of the bimetallic strip, thereby driving the trip rod to pull the trip piece to trip.

7. The overload trip mechanism of a circuit breaker of claim 6, wherein: the two guide grooves are in a shape of a Chinese character 'shan'.