CN216849821U

CN216849821U - Short circuit unlocking structure

Info

Publication number: CN216849821U
Application number: CN202122367915.4U
Authority: CN
Inventors: 薛建虎; 陈佳超; 徐勉
Original assignee: Wuxi Sahat Electrical Co Ltd
Current assignee: Wuxi Sahat Electrical Co Ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-06-28
Anticipated expiration: 2031-09-28

Abstract

The utility model discloses a short circuit unlocking structure, including fixed casing, the static contact, the moving contact, the push rod, traction lever and circuit breaker hasp, the moving contact rotates through first location axle to set up on fixed casing, the moving contact is connected with the extension spring, the traction lever rotates to set up on fixed casing, it has the driving lever to stretch out on the traction lever, the middle part of push rod sets up on fixed casing through second location axle, and the first end of push rod links firmly with the moving contact, the second end is provided with the top hook, the top hook leans on with the driving lever, and then drive the traction lever and rotate, the circuit breaker hasp rotates through third location axle and sets up on fixed casing, be provided with the groove of stepping down on the traction lever, under the first state, the moving contact leans on the static contact by extension spring elastic force effect, the circuit breaker hasp is spacing locking by the traction lever; under the second state, the moving contact is repelled under the action of electric repulsion, and the circuit breaker lock catch enters the abdicating groove to realize unlocking. The short circuit unlocking structure can realize quick breaking, is convenient and quick to install and has reliable functions.

Description

Short circuit unlocking structure

Technical Field

The utility model relates to a low-voltage circuit breaker technical field especially relates to a short circuit unblock structure.

Background

The product of current low-voltage circuit breaker mainly leans on coil ejector pin to push open the hasp and realizes the circuit breaker dropout during the short circuit, and the concrete expression makes moving iron core and coil spring motion for heavy current produces the magnetic field, and the spring gives ejector pin top-opening hasp with energy transfer for operating device unblock circuit breaker disconnection. In the tripping structure of the existing circuit breaker, although the contact and the lock catch move relatively when the short circuit is tripped, the contact cannot jack the lock catch accelerating mechanism to unlock, and quick breaking cannot be realized, so that fusion welding phenomenon easily occurs between a moving contact and a fixed contact when breaking test is carried out on the structure, and the performance of the circuit breaker is not favorably improved.

SUMMERY OF THE UTILITY MODEL

Based on current structure not enough, the utility model aims to provide a short circuit unlocking structure that simple structure, unblock are quick, the function is reliable.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a short circuit unlocking structure comprises a fixed shell, a fixed contact, a movable contact, a push rod, a draw rod and a breaker lock catch, wherein the movable contact is rotatably arranged on the fixed shell through a first positioning shaft and is connected with a tension spring; under the second state, the moving contact is repelled under the action of electric repulsion, and the circuit breaker lock catch enters the abdicating groove to realize unlocking.

Particularly, the deflector rod is always abutted against the top hook, and in a first state, the deflector rod is abutted against the hook groove of the top hook; in the second state, the deflector rod is abutted against the hook end of the top hook and reaches the maximum rotation angle of the traction rod.

Particularly, the middle part of the push rod is provided with a long circular hole, and the second positioning shaft penetrates through the long circular hole.

Particularly, the first end of the push rod is provided with a hook, and a hinge hole is formed in the movable contact corresponding to the hook.

Particularly, the bottom surface of the breaker lock catch is arranged to be an arc surface with the axis of the third positioning shaft as the center.

To sum up, the beneficial effects of the utility model are that, compare with prior art, short circuit unblock structure triggers the moving contact action according to the unusual situation of operating current, and then the linkage traction lever rotates to promote the unblock of circuit breaker hasp, realize dividing fast branch, simple structure, it is convenient to install, and the function is reliable.

Drawings

Fig. 1 is a schematic diagram of a short circuit unlocking structure provided in an embodiment of the present invention;

fig. 2 is a schematic diagram of a short circuit unlocking structure provided in the embodiment of the present invention in a normal closing state;

fig. 3 is a schematic diagram of a short circuit unlocking structure provided by the embodiment of the present invention in a short circuit state.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts throughout, or parts having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and can include, for example, fixed or removable connections, mechanical or electrical connections, indirect connections through intervening media, connections between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include both the first and second features being in direct contact, and may also include the first and second features being in contact, not in direct contact, but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 3, the preferred embodiment provides a short circuit unlocking structure, which includes a fixed housing, a fixed contact 1, a movable contact 2, a push rod 3, a pull rod 4, and a breaker latch 5.

The moving contact 2 is rotatably arranged on the fixed shell through a first positioning shaft 6, the moving contact 2 is connected with a tension spring 7, the traction rod 4 is rotatably arranged on the fixed shell, and a driving lever 8 extends out of the traction rod 4.

The middle part of the push rod 3 is arranged on the fixed shell through a second positioning shaft 9, the first end of the push rod 3 is fixedly connected with the moving contact 2, the second end of the push rod 3 is provided with a top hook 10, and the top hook 10 is abutted against the shifting lever 8 so as to drive the traction rod 4 to rotate. Specifically, the middle of the push rod 3 is provided with an oblong hole 11, the second positioning shaft 9 penetrates through the oblong hole 11, the first end of the push rod 3 is provided with a hook 12, and the movable contact 2 is provided with a hinge hole corresponding to the hook 12.

The breaker lock catch 5 is rotatably arranged on the fixed shell through the third positioning shaft 13, the draw bar 4 is provided with the abdicating groove 14, and particularly, the bottom surface of the breaker lock catch 5 is arranged to be a cambered surface taking the axis of the third positioning shaft 13 as the center, so that the breaker lock catch 5 can be conveniently drawn into the abdicating groove 14.

In a first state, namely a normal closing state, the moving contact 2 is attached to the static contact 1 under the elastic action of the tension spring 7, and the breaker lock catch 5 is limited and locked by the traction rod 4.

In a second state, namely, in a state that a short circuit is subjected to fault current, the movable contact 2 is repelled under the action of electric repulsion, the movable contact 2 acts to link the push rod 3, the draw rod 4 is further driven to rotate by a certain angle, and at the moment, the circuit breaker lock catch 5 enters the abdicating groove 14 to realize unlocking.

It should be noted that the shift lever 8 and the top hook 10 are always abutted to ensure reliable operation of the mechanism, and in the first state, the shift lever 8 is abutted to the hook groove of the top hook 10; in the second state, the shift lever 8 abuts against the hook end of the top hook 10 and reaches the maximum rotation angle of the traction rod 4, namely the position of the abdicating groove 14 facing the breaker lock catch 5.

In conclusion, the short circuit unlocking structure triggers the moving contact to act according to the abnormal working current condition, and then the linkage traction rod rotates, so that the circuit breaker is pushed to be unlocked, quick breaking is realized, the structure is simple, the installation is convenient, and the function is reliable.

The above embodiments have been merely illustrative of the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and does not depart from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A short circuit unlocking structure is characterized by comprising a fixed shell, a fixed contact, a moving contact, a push rod, a draw rod and a breaker lock catch, wherein the moving contact is rotatably arranged on the fixed shell through a first positioning shaft, the moving contact is connected with a tension spring, the draw rod is rotatably arranged on the fixed shell, the draw rod is extended out of the draw rod, the middle part of the push rod is arranged on the fixed shell through a second positioning shaft, the first end of the push rod is fixedly connected with the moving contact, the second end of the push rod is provided with a top hook, the top hook is abutted against the draw rod to drive the draw rod to rotate, the breaker lock catch is rotatably arranged on the fixed shell through a third positioning shaft, the draw rod is provided with a abdicating groove,

in the first state, the movable contact is attached to the fixed contact under the elastic action of the tension spring, and the circuit breaker lock catch is limited and locked by the traction rod; under the second state, the moving contact is repelled under the action of electric repulsion, and the circuit breaker lock catch enters the abdicating groove to realize unlocking.

2. The short circuit unlocking structure according to claim 1, wherein: the deflector rod is always abutted against the top hook, and in a first state, the deflector rod is abutted against the hook groove of the top hook; in the second state, the deflector rod is abutted against the hook end of the top hook and reaches the maximum rotation angle of the traction rod.

3. The short circuit unlocking structure according to claim 1, wherein: the middle part of the push rod is provided with a long circular hole, and the second positioning shaft penetrates through the long circular hole.

4. The short circuit unlocking structure according to claim 1, wherein: the first end of the push rod is provided with a hook, and the movable contact is provided with a hinge hole corresponding to the hook.

5. The short circuit unlocking structure according to claim 1, wherein: the bottom surface of the breaker lock catch is arranged to be an arc surface taking the axis of the third positioning shaft as the center.