WO2022033343A1

WO2022033343A1 - Operating mechanism for circuit breaker

Info

Publication number: WO2022033343A1
Application number: PCT/CN2021/109983
Authority: WO
Inventors: 丁国发; 石林勇
Original assignee: 浙江威利坚科技股份有限公司
Priority date: 2020-08-08
Filing date: 2021-08-02
Publication date: 2022-02-17
Also published as: CN111785586A

Abstract

The present invention relates to an operating mechanism for a circuit breaker, comprising a handle, a connecting rod provided as linked to the handle, a lock buckle, a contact frame, a dynamic contact provided as linked to the contact frame, and a torsion spring provided between the lock buckle and the contact frame. A limiting groove is provided on the contact frame; moreover, the limiting groove is provided on either side with a lock buckling area and an unbuckling area. A lock buckling part corresponding to the lock buckling area is provided on the lock buckle. A limiting surface that can be abutted against the lock buckling part is provided on the contact frame. One end of the connecting rod is inserted into the lock buckling area. A locking surface matching the connecting rod is provided on the lock buckling part. When the circuit breaker is closed, a locking cavity used for locking the connecting rod is provided between the locking surface and the lock buckling area; when the circuit breaker is unbuckled and opened, one end of the connecting rod slides from the lock buckling area into the unbuckling area. The present invention has the advantages of a simple structure, steady and reliable performance, convenient assembly, and effectively increased breaking capability of the circuit breaker.

Description

An operating mechanism for a circuit breaker

technical field

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

Background technique

Small circuit breakers, also known as miniature circuit breakers, are mainly used in places with AC 50HZ or 60HZ, rated voltage below 400V, and rated working current below 63A. It is used for overload and short-circuit protection of lighting, distribution lines and equipment in office buildings, residences and similar buildings, and can also be used for infrequent on-off operations and conversions of lines. It is mainly used in various places such as industrial, commercial, high-rise and residential buildings. With the development of society, users have higher and higher requirements for the use of miniature circuit breakers, and miniature circuit breakers are gradually developing in the direction of high breaking and high current. The existing small circuit breaker includes a shell, an operating mechanism, a contact system, a tripping mechanism, an arc extinguishing system, and a conductive system. The design is complex, there are many parts, the assembly is cumbersome, the assembly efficiency is low, and the tripping sensitivity is low, resulting in a slow opening and closing speed and a weak breaking capacity of the existing small circuit breaker. Unable to adapt to the development trend of high segment and current.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the defects of the prior art, and provide a circuit breaker operating mechanism with simple structure, stable and reliable performance, convenient assembly, and can effectively improve the breaking capacity of the circuit breaker.

In order to achieve the above purpose, the present invention adopts an operating mechanism of a circuit breaker, comprising a handle, a connecting rod arranged in linkage with the handle, a lock, a contact frame, a movable contact arranged in linkage with the contact frame, The torsion spring between the contact frames, the contact frame is provided with a limit slot, and the two ends of the limit slot are respectively formed with a lock area and a release area, and the lock is corresponding to the lock area. A locking portion is provided, and the contact frame is provided with a limit surface that can abut against the locking portion, one end of the connecting rod is inserted into the locking area, and the locking portion is provided with a connecting rod. When the circuit breaker is closed, a locking cavity for locking the connecting rod is formed between the locking surface and the locking area. When the circuit breaker is tripped and opened, one end of the connecting rod can be locked. Slide from the latch area to the trip area.

The beneficial effects of the above structure are: the operating mechanism of the traditional small circuit breaker is improved, the structure of the operating mechanism of the traditional small circuit breaker is greatly simplified, the closing speed is faster, and the tripping action is more sensitive, thereby facilitating the improvement of the circuit breaker. The breaking capacity of the operating mechanism is provided with a lock area and a release area on the lock. When closing, one end of the connecting rod is locked between the lock and the lock area, so that the operating mechanism can be reliably closed. When tripping, one end of the connecting rod loses the restriction of the locking surface of the lock, so that the rapid tripping and opening of the operating mechanism can be realized. Therefore, the operating mechanism of the circuit breaker has the advantages of simple structure, stable and reliable performance, convenient assembly, and can effectively improve the breaking capacity of the circuit breaker.

In particular, the contact frame is provided with a raised portion, and the raised portion is provided with a contact spring, one end of the contact spring is clamped in the positioning groove on the contact frame, and the other end of the contact spring is clamped on the limit piece on the moving contact. A contact spring is arranged between the contact frame and the movable contact, and the contact spring can enhance the contact pressure of the movable contact, which is beneficial to improve the working reliability of the operating mechanism.

In particular, one end of the contact frame is provided with an opening and closing indicating part, and the opening and closing indicating part is respectively provided with a closing indicating sign and an opening indicating sign. An opening and closing indication part is arranged on the contact frame, so that the opening and closing indication function of the operating mechanism can be realized.

In particular, a boss is provided on the lock corresponding to the torsion spring, the torsion spring is sleeved on the boss, and one end of the torsion spring is engaged in the slot of the contact frame. The other end of the torsion spring is engaged in the positioning groove of the lock. The torsion spring is clamped between the contact frame and the lock, so that the assembly of the contact frame, the lock and the torsion spring is facilitated, and the assembly efficiency of the operating mechanism is improved.

In particular, the lock is provided with a pull rod, one end of the pull rod has a hook body, the hook body is engaged with the bimetallic sheet of the circuit breaker, and constitutes the interlocking cooperation between the lock catch and the bimetallic sheet. The lock is provided with a pull rod that is linked with the bimetallic sheet. When the line fails, the bimetallic sheet drives the lock to perform a tripping action, thereby protecting the circuit.

Description of drawings

FIG. 1 is a perspective view of an embodiment of the present invention from a first perspective.

FIG. 2 is a perspective view of an embodiment of the present invention from a second perspective.

FIG. 3 is a perspective view of a contact bracket according to an embodiment of the present invention.

4 is a perspective view of a lock according to an embodiment of the present invention.

detailed description

As shown in FIGS. 1 to 4 , the embodiment of the present invention is an operating mechanism of a circuit breaker, including a handle 10 , a connecting rod 11 linked with the handle 10 , a lock 12 , a contact frame 13 , and a linkage with the contact frame 13 . The movable contact 14 is provided, and the torsion spring 15 is provided between the lock catch 12 and the contact frame 13. The contact frame 13 is provided with a limit slot 131, and the two ends of the limit slot 131 are respectively formed with locks. The latching area 132 and the tripping area 133 are provided with a latching portion 121 corresponding to the latching area 133 on the latching latch 12 , and the contact frame 13 is provided with a limiting surface 130 that can abut against the latching portion 121 . , one end of the connecting rod 11 is inserted into the locking area 132, and the locking surface 122 is provided on the locking portion 121 to cooperate with the connecting rod 11. When the circuit breaker is closed, the locking surface 122 A locking cavity 134 for locking the connecting rod 11 is formed between it and the locking region 132 . When the circuit breaker trips and opens, one end of the connecting rod 11 can slide from the locking region 132 to the tripping region 133 . The contact frame 13 is provided with a groove 139 , the middle of the lock 12 is engaged in the groove 139 , and the middle of the lock 12 is provided with a rotating shaft 17 connected to the contact frame 13 . The locking surface 122 is an arc surface.

As shown in FIGS. 1 and 2 , the contact frame 13 is provided with a raised portion 135 , the raised portion 135 is provided with a contact spring 16 , and one end of the contact spring 16 is engaged with the contact frame 13 . In the positioning groove 136 , the other end of the contact spring 16 is engaged with the limiting piece 141 on the movable contact 14 . A contact spring is arranged between the contact frame and the movable contact, and the contact spring can enhance the contact pressure of the movable contact, which is beneficial to improve the working reliability of the operating mechanism. One end of the contact frame 13 has an opening and closing indication portion 137 , and a closing indication sign 1371 and an opening indication sign 1372 are respectively provided on the opening and closing indication portion 137 . An opening and closing indication part is arranged on the contact frame, so that the opening and closing indication function of the operating mechanism can be realized. The locking buckle 12 is provided with a boss 123 corresponding to the torsion spring 15 , the torsion spring 15 is sleeved on the boss 123 , and one end of the torsion spring 15 is engaged with the slot 138 of the contact frame 13 . Inside, the other end of the torsion spring 15 is engaged in the positioning groove 124 of the lock catch 12 . The torsion spring is clamped between the contact frame and the lock, so that the assembly of the contact frame, the lock and the torsion spring is facilitated, and the assembly efficiency of the operating mechanism is improved. The lock 12 is provided with a pull rod 125, one end of the pull rod 125 has a hook body 126, the hook body 126 is engaged with the bimetal of the circuit breaker, and constitutes the interlocking cooperation between the lock 12 and the bimetal. . The lock is provided with a pull rod that is linked with the bimetallic sheet. When the line fails, the bimetallic sheet drives the lock to perform a tripping action, thereby protecting the circuit.

The operating mechanism of the traditional small circuit breaker is improved, which greatly simplifies the structure of the operating mechanism of the traditional small circuit breaker, the closing speed is faster, and the tripping action is more sensitive, thereby helping to improve the breaking capacity of the circuit breaker operating mechanism. The lock is provided with a lock area and a release area. When closing, one end of the connecting rod is locked between the lock and the lock area, so that the operating mechanism can be reliably closed. One end of the lock loses the restriction of the locking surface of the lock, so that the quick release and opening of the operating mechanism can be realized. Therefore, the operating mechanism of the circuit breaker has the advantages of simple structure, stable and reliable performance, convenient assembly, and can effectively improve the breaking capacity of the circuit breaker.

Claims

An operating mechanism of a circuit breaker, characterized in that the operating mechanism comprises a handle, a connecting rod arranged in linkage with the handle, a lock, a contact frame, a movable contact arranged in linkage with the contact frame, The torsion spring between the contact frame and the contact frame, the contact frame is provided with a limit groove, and the two ends of the limit groove are respectively formed with a lock area and a release area, and the lock button corresponds to the lock area. A locking portion is arranged at the contact frame, and a limit surface that can abut against the locking portion is arranged on the contact frame, one end of the connecting rod is inserted into the locking region, and the locking portion is provided with a The locking surface matched with the connecting rod. When the circuit breaker is closed, a locking cavity for locking the connecting rod is formed between the locking surface and the locking area. When the circuit breaker is tripped and opened, one end of the connecting rod is closed. It can be slid from the latch area to the trip area.
The operating mechanism of the circuit breaker according to claim 1, wherein the contact frame is provided with a convex portion, a contact spring is provided on the convex portion, and one end of the contact spring is engaged with the contact In the positioning groove on the frame, the other end of the contact spring is clamped on the limit piece on the movable contact.
The operating mechanism of the circuit breaker according to claim 1 or 2, characterized in that: one end of the contact frame is provided with an opening and closing indicating part, and the opening and closing indicating part is respectively provided with closing indicating signs, opening and closing indicating signs, opening and closing indicating parts. Gate indicator sign.
The operating mechanism of the circuit breaker according to claim 1 or 2, wherein a boss is provided on the lock corresponding to the torsion spring, the torsion spring is sleeved on the boss, and the torsion spring is One end of the torsion spring is engaged in the slot of the contact frame, and the other end of the torsion spring is engaged in the positioning slot of the contact lock.
The operating mechanism of the circuit breaker according to claim 1 or 2, characterized in that: the lock is provided with a pull rod, one end of the pull rod has a hook-shaped body, and the hook-shaped body is engaged with the bimetal of the circuit breaker on the sheet, and constitutes the interlocking cooperation between the lock and the bimetal sheet.