WO2021142912A1

WO2021142912A1 - Novel mechanical mechanism circuit breaker

Info

Publication number: WO2021142912A1
Application number: PCT/CN2020/079474
Authority: WO
Inventors: 彭苏富; 徐象兵; 旷荣昌
Original assignee: 美高电气科技有限公司
Priority date: 2020-01-15
Filing date: 2020-03-16
Publication date: 2021-07-22
Also published as: CN111243911A

Abstract

The present invention relates to the technical field of circuit breakers, and in particular to a novel mechanical mechanism circuit breaker. An operating mechanism of the circuit breaker comprises an operating handle, a lock catch, and a base provided with a moving contact assembly. The operating handle is provided with a connecting member. The lock catch comprises a lock catch rotating shaft and a lock catch limiting structure. The base comprises a base rotating shaft and a sliding groove provided with a base limiting structure. One part of the connecting member is located in the sliding groove, and a sliding groove limiting structure matched with the lock catch limiting structure is provided at one end in the sliding groove. According to the technical solution, when a circuit is normal, the operating handle is interlocked with the lock catch and the base by means of the connecting member, and opening and closing are performed by means of the operating handle; and when a circuit fault occurs, the interlocking between the connecting member and the base is disintegrated, so that automatic tripping of a product is achieved, and the circuit is protected.

Description

A new type of mechanical mechanism circuit breaker

Technical field

The invention relates to the technical field of circuit breakers, in particular to a new type of mechanical mechanism circuit breaker.

Background technique

Miniature circuit breakers refer to protective electrical appliances installed on terminal power distribution lines. They are mainly used for overload and short-circuit protection of circuits and electrical equipment. Miniature circuit breakers are generally composed of operating mechanisms, electromagnetic tripping mechanisms, thermal tripping mechanisms, arc extinguishing mechanisms, etc. The operating mechanism refers to the components used to open and close the circuit breaker. The operating mechanism must ensure the reliable closure of the circuit breaker and the rapid opening of the circuit breaker in the fault state. The performance of the operating mechanism directly affects the circuit breaker’s performance. Function.

The invention patent application with application publication number CN110459447A and application publication date November 15, 2019 discloses a circuit breaker operating mechanism. Under normal conditions, by turning the U-shaped push rod on the handle to drive the bracket assembly composed of the contact bracket, the jumper, the lock, and the moving contact to move, the moving contact and the static contact are connected or disconnected to achieve the close , Opening. When the line fails, the trip and the lock are separated to realize the free opening of the product and protect the line. Because the transmission mechanism between the operating handle and the moving contact involves many parts and complex structure, it is prone to failure, and the overlap area between the jumper and the lock is small, and it requires high dimensional accuracy and high component strength.

Summary of the invention

technical problem

The solution to the problem

Technical solutions

In order to solve the above technical problems, the present invention provides a circuit breaker operating mechanism, which is characterized in that it includes an operating handle, a lock catch, and a base on which a moving contact assembly is installed; the operating handle is provided with a connector; the lock catch The base includes a lock shaft and a lock stop structure; the base includes a base shaft and a slide groove provided with a base stop structure; a part of the connector is located in the slide groove, and one end of the slide groove A chute limiting structure matched with the lock limiting structure is provided.

In the above technical scheme, when the circuit is normal, the operating handle is interlocked with the lock and the base through its connector, and the opening and closing is performed by the operating handle; when the circuit is faulty, the interlock between the connector and the base is disassembled to realize automatic product tripping , Protect the line.

Preferably, the chute limit structure is a limit step provided at one end of the chute.

Preferably, the sliding groove limiting structure is a recess provided at one end of the sliding groove.

Preferably, the lock catch limiting structure is a limiting opening provided on the lock catch facing the other end of the sliding groove.

Preferably, the lock shaft is provided with a lock reset member, so that the lock has a pre-tightening force that rotates in a positive direction; the base shaft is provided with a base reset member, so that the base has The pre-tightening force that rotates in the opposite direction; the limit step is arranged close to the end of the chute that is located forward in the opposite direction.

Preferably, the lock buckle includes a magnetic tripping action portion.

Preferably, the lock buckle includes a thermal tripping action portion.

Preferably, the connecting piece is a U-shaped connecting rod, one end of the connecting piece is connected with the handle body, and the other end of the connecting piece is located in the sliding groove.

The present invention also provides a new mechanical mechanism circuit breaker, which is characterized in that: a casing, a tripping mechanism and an operating mechanism provided in the casing; the operating mechanism is as described in any one of the above.

Preferably, it also includes an arc extinguishing device arranged in the housing.

The beneficial effects of the invention

Beneficial effect

The present invention has the following beneficial effects:

1. There is no need to use jumpers, which reduces material costs and improves production efficiency. The structure is simple and it is convenient for later automated assembly.

2. There is no need to use the trip button, the fault action transmission line is shortened, the action time is shortened, and the breaking performance is also improved.

3. The handle connector is located in the chute and the limit port in the locked or unlocked state, which reduces the dimensional accuracy and strength requirements of the parts and improves the reliability of the protection.

Brief description of the drawings

Description of the drawings

Fig. 1 is a schematic diagram of the internal structure of a circuit breaker according to an embodiment of the present invention.

Figure 2 is a second schematic diagram of the internal structure of the circuit breaker according to the embodiment of the present invention.

Fig. 3 is an assembly schematic diagram of the operating mechanism of the circuit breaker according to the embodiment of the present invention.

Invention embodiment

Embodiments of the present invention

The terms used herein are only used for the purpose of describing specific embodiments, and are not intended to limit the present invention. Unless otherwise defined, all terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. It will be further understood that commonly used terms should be interpreted as having meanings consistent with their meanings in the relevant field and the present disclosure. The present disclosure will be considered as an example of the present invention, and is not intended to limit the present invention to specific embodiments.

A circuit breaker includes a movable contact 11 and a static contact 12, and a first connection screw 111 and a second connection screw 121 provided corresponding to the movable contact 11 and the static contact 12. The first terminal screw 111 and the second terminal screw 121 are the movable terminal and the static terminal. The first connection screw 111 and the second connection screw 121 are respectively connected to a first connection line and a second connection line external to the circuit breaker. The movable contact 11 is connected to the external first connecting wire through the flexible connection 131, the bimetallic strip 2, the connecting strip 133, the wiring board 134, and the first wiring screw 111. The bimetal 2 will bend when heated, and serve as a thermal trip mechanism of the circuit breaker. The bimetal 2 and the static contact 12 are connected to an externally connected second connecting wire through the second connecting screw 121, and an electromagnetic tripping structure 3 for tripping is also connected between the two. When the movable contact 11 and the static contact 12 are in contact with each other, the first connecting wire and the second connecting wire are connected. The circuit in which the second connecting wire, the second connecting screw, the static contact, the moving contact, the first connecting screw and the first connecting wire are conducted is called the main circuit of the circuit breaker. When the movable contact 11 and the static contact 12 are disconnected, an arc will be generated. For this reason, the circuit breaker of this embodiment is also provided with an arc extinguishing device for users to extinguish the arc. The arc extinguishing device is in the prior art, and generally includes a magnetic blowing system and an arc extinguishing chamber 4. The magnetic blowing system is used to blow the arc to the arc extinguishing chamber 4 to achieve rapid arc extinguishing.

The operating mechanism of the circuit breaker is a new type of mechanical structure, which includes an operating handle 51 rotatably installed in the housing, a lock 52, and a base 53 on which a moving contact assembly is installed. The operating handle includes a connecting piece 512 and an operating handle main body 511 made of plastic material. The connecting member 512 in this embodiment is a U-shaped connecting rod, one end of which is fixedly connected to the handle body 511, and the other end is used to cooperate with the lock catch 52 and the base 53 to interlock. As shown in Figures 1-2, the lock 52 includes a lock body made of plastic material. The center of the lock body is rotatably fixed in the housing by the lock shaft 521. One side of the lock body is provided with a corresponding connection The buckle limiting structure 522 of the piece 512. A torsion spring 55 is provided on the lock shaft 521 as a lock reset member, so that the lock has a pre-tightening force toward the positive direction (clockwise as shown in FIGS. 1 and 2). The base 53 is rotatably fixed in the housing by a base shaft 531. The part of the base 53 above the base shaft is provided with a sliding groove 532 corresponding to the connecting piece 512. The part of the base 53 below the base shaft can be The movable contact mounting plate 533 is rotatably installed, and the movable contact 11 can be installed on the movable contact mounting plate 533 by welding, clamping, hot riveting, screw connection, torsion spring connection and other connection methods in the prior art. A torsion spring 55 is provided on the base rotating shaft 531 as a base restoring member, so that the base has a pretension force facing the opposite direction (clockwise as shown in FIGS. 1 and 2). The movable contact mounting plate 533 and the movable contact 11 constitute a movable contact assembly mounted on the base 53. One end of the connecting piece 512 extends into the sliding groove 532. A sliding groove limiting structure 5321 is provided at the end of the sliding groove 532 close to the operating handle, and the sliding groove limiting structure is arranged close to the front end of the sliding groove in the opposite direction. The sliding groove limiting structure may be a limiting step provided in the sliding groove 532 or a groove provided in the sliding groove 532. The locking stop structure 522 may be an opening or a groove that is disposed toward the chute stop structure, or may be a clamping structure for clamping the connecting member 512. The lock catch limiting structure 522 in this embodiment is a limiting opening on the lock facing the chute that is not provided. One end of the connecting piece 512 is located in the sliding groove. Due to the blocking of the edge of the groove or the limiting step, the connecting piece 512 is limited in the groove of the sliding groove or the space between the limiting step of the sliding groove and the end of the sliding groove. At the same time, the connecting piece 512 is also located in the limit opening of the lock, so that it can be linked with the lock, so that the operating handle, the connecting piece of the operating handle, the base, and the lock constitute a four-bar structure, and the circuit breaker can be controlled by the operating handle Open and close.

On the other side of the buckle body opposite to the buckle limiting structure is provided with a magnetic tripping action portion 523 and a thermal tripping action portion 524. The magnetic tripping action portion 523 corresponds to the iron core of the magnetic tripping structure, and the thermal tripping structure corresponds to the bimetallic setting of the thermal tripping structure. When the overload current of the main circuit of the circuit breaker is generated, the bimetallic sheet is heated and bent to push the lock buckle to overcome the pre-tightening force and rotate in the positive direction (that is, the counterclockwise direction in Figures 1 and 2), so that the connector, the lock buckle, and the base When the base is unlocked, the base rotates in a clockwise direction under the action of the pre-tightening force, and the sliding groove of the base reserves space for the connecting piece when the base rotates to prevent interference with the rotation of the base. The rotation of the base 53 further drives the movable contact mounted on it to separate from the static contact. When the main circuit is short-circuited and the short-circuit current is generated, the electromagnetic attraction force generated by the current flowing through the coil of the magnetic tripping mechanism is greater than the reverse elastic force of the magnetic tripping mechanism, and the iron core acts on the magnetic tripping part to push the lock to overcome the pre-tightening force Rotate in the positive direction (that is, the counterclockwise direction in Figures 1 and 2) to unlock the connector, the lock and the base. The base rotates in the clockwise direction under the action of the pre-tightening force, and the base slides. When the base rotates, the groove reserves space for the connecting piece to prevent interference with the rotation of the base.

The invention has the following beneficial effects: it does not need to use jumpers, reduces material costs, improves production efficiency, has a simple structure, and is convenient for later automated assembly; fault action transmission lines are shortened, action time is shortened, and breaking performance is also improved; handle connection The parts are located in the chute and the limit opening in the locked or unlocked state, which reduces the dimensional accuracy and strength requirements of the parts and improves the reliability of the protection.

Although the embodiments of the present invention have been described, those of ordinary skill in the art can make various variations or modifications within the scope of the appended claims.

Claims

A circuit breaker operating mechanism, which is characterized in:

Including the operating handle, the lock catch, and the base on which the moving contact assembly is installed;

The operating handle is provided with a connecting piece;

The lock buckle includes a lock buckle shaft and a lock buckle limit structure;

The base includes a base rotating shaft and a sliding groove provided with a base limiting structure;

A part of the connecting piece is located in the chute, and one end of the chute is provided with a chute limiting structure that matches with the lock buckle limiting structure.
A circuit breaker operating mechanism according to claim 1, characterized in that:

The chute limit structure is a limit step provided at one end of the chute.
A circuit breaker operating mechanism according to claim 1, characterized in that:

The sliding groove limiting structure is a recess provided at one end of the sliding groove.
A circuit breaker operating mechanism according to claim 2 or 3, characterized in that:

The lock catch limiting structure is a limiting opening provided on the lock catch facing the other end of the sliding groove.
A circuit breaker operating mechanism according to claim 4, characterized in that:

The lock shaft is provided with a lock reset member, so that the lock has a pre-tightening force that rotates in the positive direction; the base shaft is provided with a base reset member, so that the base has a reverse direction Pre-tightening force of rotation;

The limit step is arranged close to the front end of the sliding groove in the opposite direction.
A circuit breaker operating mechanism according to claim 5, characterized in that:

The lock includes a magnetic tripping action portion.
A circuit breaker operating mechanism according to claim 5, characterized in that:

The buckle includes a thermal tripping action portion.
A circuit breaker operating mechanism according to claim 1, characterized in that:

The connecting piece is a U-shaped connecting rod, one end of the connecting piece is connected with the handle body, and the other end of the connecting piece is located in the sliding groove.
A new type of mechanical mechanism circuit breaker, which is characterized by:

A housing and a tripping mechanism and an operating mechanism provided in the housing;

The operating mechanism is as described in any one of claims 1-8.
A new type of mechanical mechanism circuit breaker according to claim 9, characterized in that:

It also includes an arc extinguishing device arranged in the housing.