CN111834173A

CN111834173A - Tripping mechanism of circuit breaker

Info

Publication number: CN111834173A
Application number: CN202010782789.6A
Authority: CN
Inventors: 刘时胜; 王斌; 李阳智; 付志强
Original assignee: Jiangxi Hangtong Electric Technology Co ltd; Shanghai Retel Electric Technology Co ltd
Current assignee: Jiangxi Hangtong Electric Technology Co ltd; Shanghai Retel Electric Technology Co ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2020-10-27

Abstract

The invention relates to the technical field of circuit breaker tripping, in particular to a tripping mechanism of a circuit breaker, which comprises: the magnetic trip assembly and the thermal trip assembly are arranged, the magnetic trip assembly comprises an iron core fixedly arranged in the circuit breaker and a coil wound outside the iron core, a movable armature is movably arranged at one end of the iron core, an energy storage part is fixedly arranged on one side of the movable armature, the thermal trip assembly comprises a bimetal fixedly arranged in the circuit breaker, a fixing plate is arranged between the bimetal and an arc isolating plate, and an adjusting screw used for adjusting the bimetal is arranged on one side of the fixing plate.

Description

Tripping mechanism of circuit breaker

Technical Field

The invention relates to the technical field of circuit breaker tripping, in particular to a tripping mechanism of a circuit breaker.

Background

The low-voltage circuit breaker generally comprises a release, a contact system, an arc-extinguishing device, a transmission mechanism, a pedestal, a shell and the like, wherein when the low-voltage circuit breaker is put into operation, an operating handle closes a main contact, a free release mechanism locks the main contact at a closed position, and various releases enter an operation state;

most of the existing circuit breakers are only provided with a tripping mechanism, when a short-circuit fault occurs in a circuit, the tripping mechanism can play a role of cutting off a power supply, but if only one tripping mechanism is arranged, when the tripping mechanism cannot normally operate due to the fault, the tripping mechanism can possibly cut off the power supply, and finally a circuit is damaged.

Disclosure of Invention

The present invention is directed to a trip mechanism of a circuit breaker, so as to solve the problems mentioned in the background art.

The above object of the present invention is achieved by the following technical solutions:

a trip mechanism for a circuit breaker, comprising: magnetic trip subassembly and hot trip subassembly, the magnetic trip subassembly includes fixed mounting in the inside iron core of circuit breaker and twines in the outside coil of iron core, iron core one end activity is provided with moves armature, it is fixed to be provided with the energy storage piece to move armature one side, the hot trip subassembly includes fixed mounting in the inside bimetallic member of circuit breaker, be provided with the fixed plate between bimetallic member and the flash barrier, fixed plate one side is provided with the adjusting screw who is used for adjusting the bimetallic member.

Furthermore, the movable armature and the energy storage element are connected in a hasp mode.

Furthermore, the energy storage part is integrally provided with two trip rods, one end of one trip rod, which is far away from the energy storage part, is in transmission connection with the supporting part of the moving contact, and the other trip rod is positioned at the bottom of one end of the bimetal.

Furthermore, one ends of the two trip rods, which are far away from the energy storage piece, are arc-shaped.

Furthermore, the bimetallic strip and the fixing plate are fixedly connected by welding or riveting or a combination of the welding and the riveting.

Furthermore, adjusting screw threaded connection is in circuit breaker inside on the flash barrier, the one end that adjusting screw is close to the bimetallic strip is arc.

Compared with the prior art, the invention provides a tripping mechanism of a circuit breaker, which has the following beneficial effects:

1. the invention, through setting up the magnetic trip assembly, bimetallic trip assembly, armature and cooperating use of the energy storage piece, when passing the normal current in the circuit when short circuit takes place in the circuit, the electromagnetic force that the iron core produces is smaller than the reaction, the pulling force of the force spring, the street iron can't be sucked by the iron core, the normal operation of the circuit breaker, at this moment, the heating element heats up and makes the bimetallic strip bend to the definite degree and reach the dynamic equilibrium state, the bimetallic strip no longer continues to bend, when the short circuit fault takes place in the circuit, the current exceeds several times of the normal current, the electromagnetic force that the iron core produces is greater than the effort of the reaction force spring, the armature is sucked by the iron core and impels the free trip gear to release the main contact through the energy storage piece, the main contact separates the cut-off circuit under the function of the opening spring, meanwhile, the bimetallic strip will continue to bend, impel, the main contacts are separated under the action of the opening spring, the cut-off circuit plays a role in overload protection, and the magnetic tripping component and the bimetallic component can push the energy storage component to break the circuit when the current in the circuit is too large, so that the problem that the circuit breaker cannot accurately break the circuit due to the fact that a single tripping mechanism is arranged is avoided;

2. according to the invention, the adjusting screw is arranged, so that the bending degree of the bimetallic strip can be conveniently adjusted, and the bimetallic strip can be pushed to a proper position after being heated;

3. according to the invention, the fixing plate is arranged, so that the bimetallic strip can be stably installed in the circuit breaker, and the working stability of the bimetallic strip is improved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the connection structure of the movable armature and the energy storage member of the invention.

In the figure: 1-an iron core; 2-a coil; 3-moving armature; 4-an energy storage member; 401-trip lever; 5-bimetallic strip; 6, fixing a plate; 7-adjusting the screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): referring to fig. 1 to 2, the present invention provides a technical solution: a trip mechanism for a circuit breaker, comprising: the magnetic trip assembly comprises an iron core 1 fixedly arranged in the breaker and a coil 2 wound outside the iron core 1, one end of the iron core 2 is movably provided with a movable armature 3, one side of the movable armature 3 is fixedly provided with an energy storage part 4, the thermal trip assembly comprises a bimetallic part 5 fixedly arranged in the breaker, a fixing plate 6 is arranged between the bimetallic part 5 and an arc baffle, one side of the fixing plate 6 is provided with an adjusting screw 7 for adjusting the bimetallic part 5, the movable armature 3 and the energy storage part 4 are connected in a hasp mode, the energy storage part 4 is integrally provided with two trip rods 401, one end of one trip rod 401, which is far away from the energy storage part 4, is in transmission connection with a support part of the movable contact, the other trip rod 401 is positioned at the bottom of one end of the bimetallic part 5, and one ends of the two trip rods 401, which are far away from the energy storage part 4, are, by arranging the magnetic trip assembly, the bimetallic trip assembly, the armature 3 and the energy storage element 4, when normal current passes through a circuit when short circuit occurs in the circuit, the electromagnetic force generated by the iron core 1 is smaller than the reaction force, the electromagnet 3 cannot be attracted by the iron core 1 by the tension of the force spring, the circuit breaker normally operates, at the moment, the heating element generates heat to bend the bimetallic strip 5 to a certain degree and reach a dynamic balance state, the bimetallic strip 5 is not bent continuously any more, when short circuit fault occurs in the circuit, the current exceeds a plurality of times of the normal current, the electromagnetic force generated by the iron core 1 is larger than the acting force of the reaction force spring, the armature 3 is attracted by the iron core 1, the free trip mechanism is pushed by the energy storage element 4 to release a main contact, the main contact is separated to cut off the circuit under the action of the separating spring, meanwhile, the bimetallic strip 5 is bent continuously, and the free trip mechanism is pushed by the energy, the main contact separates under the effect of separating brake spring, and the circuit breaker plays overload protection's effect, and magnetism trip assembly and bimetal component homoenergetic promote energy storage component 4 when the electric current is too big in the circuit and break off the circuit, have avoided leading to the circuit breaker can not accurate circuit breaker owing to set up when single tripping device goes wrong.

Wherein, adopt welding or riveting or the two carries out fixed connection with the mode between bimetallic strip 5 and the fixed plate 6, through setting up fixed plate 6, can stabilize bimetallic strip 5 and install in the circuit breaker, improved the stability of bimetallic strip 5 work.

Wherein, adjusting screw 7 threaded connection is on the inside flash barrier of circuit breaker, and adjusting screw 7 is arc near the one end of bimetallic strip 5, through setting up adjusting screw 7, is convenient for adjust bimetallic strip 5's crookedness to this guarantees that bimetallic strip 5 is enough to push away energy storage 4 to suitable position after being heated.

The working principle is as follows: in the using process of the invention, when normal current passes through a circuit when short circuit occurs in the circuit, the electromagnetic force generated by the iron core 1 is smaller than the reaction, the iron core 3 can not be attracted by the iron core 1 by the tension of the force spring, the circuit breaker normally operates, at the moment, the heating element heats to bend the bimetallic strip 5 to a certain degree and reach a dynamic balance state, the bimetallic strip 5 can not be bent continuously, when short circuit fault occurs in the circuit, the current exceeds a plurality of times of the normal current, the electromagnetic force generated by the iron core 1 is larger than the acting force of the reaction force spring, the armature 3 is attracted by the iron core 1, the free tripping mechanism is pushed by the energy storage element 4 to release the main contact, the main contact separates to cut off the circuit under the action of the opening spring, meanwhile, the bimetallic strip 5 continuously bends, the free tripping mechanism is pushed by the energy storage element 4 to release the main contact, the main contact separates under, the effect that the cutoff circuit played overload protection, magnetism trip unit and bimetallic assembly homoenergetic promote energy storage component 4 when the circuit current is too big with the circuit disconnection, avoided leading to the circuit breaker can not accurate circuit breaking accurately when setting up single tripping device and going wrong, through setting up fixed plate 6, can install bimetallic strip 5 firm in the circuit breaker, the stability of bimetallic strip 5 work has been improved, through setting up adjusting screw 7, be convenient for adjust bimetallic strip 5 crookedness, guarantee with this that bimetallic strip 5 is enough to push away energy storage component 4 to suitable position after being heated.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A trip mechanism for a circuit breaker, comprising: magnetic tripping subassembly and thermal tripping subassembly, its characterized in that: magnetism trip unit includes iron core (1) of fixed mounting in the inside of circuit breaker and twines in coil (2) of iron core (1) outside, iron core (2) one end activity is provided with moves armature (3), it is fixed in armature (3) one side and is provided with energy storage spare (4), heat trip unit is including fixed mounting in the inside bimetallic member (5) of circuit breaker, be provided with between bimetallic member (5) and the flash barrier fixed plate (6), fixed plate (6) one side is provided with adjusting screw (7) that are used for adjusting bimetallic member (5).

2. The trip mechanism of a circuit breaker of claim 1, wherein: the movable armature (3) and the energy storage element (4) are connected in a hasp mode.

3. The trip mechanism of a circuit breaker of claim 1, wherein: the energy storage part (4) is integrally provided with two trip rods (401), one end of each trip rod (401), which is far away from the energy storage part (4), is in transmission connection with the supporting part of the moving contact, and the other trip rod (401) is positioned at the bottom of one end of the bimetal part (5).

4. A trip mechanism for a circuit breaker as claimed in claim 3, wherein: and one ends of the two trip rods (401) far away from the energy storage piece (4) are arc-shaped.

5. The trip mechanism of a circuit breaker of claim 1, wherein: the bimetallic strip (5) and the fixing plate (6) are fixedly connected by welding or riveting or a combination of the two.

6. The trip mechanism of a circuit breaker of claim 1, wherein: adjusting screw (7) threaded connection is on the inside flash barrier of circuit breaker, adjusting screw (7) are close to the one end of bimetallic strip (5) and are arc.