CN213583679U

CN213583679U - Moving contact of circuit breaker

Info

Publication number: CN213583679U
Application number: CN202023221787.4U
Authority: CN
Inventors: 马雄杰; 杨鸣霏; 周敏琛
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-06-29
Anticipated expiration: 2030-12-28

Abstract

A moving contact of a circuit breaker belongs to the technical field of low voltage. The moving contact comprises a moving contact piece, a contact spring and a contact support; the contact support swing is arranged in the breaker; the movable contact piece is rotatably arranged on one side of the contact support; one end of the contact spring is abutted against the contact support, and the other end of the contact spring is abutted against the movable contact piece; the method is characterized in that: a spring protection structure is arranged on one side of the contact supporting rotating end and above the contact spring, the spring protection structure comprises a push rod and a push rod spring, one end of the push rod is abutted against one end of the push rod spring, and the other end of the push rod is abutted against the movable contact piece; the contact support is provided with a matching cavity, the ejector rod spring is accommodated in the matching cavity and is abutted against the matching cavity, and the ejector rod is used for protecting the contact spring from being corroded by metal high-temperature particles. The advantages are that: the protection structure has the advantages that the protection structure is provided with the contact spring, the contact spring can be effectively protected from being corroded by metal high-temperature particles, and the protection structure is simple in structure and long in service life.

Description

Moving contact of circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to moving contact of circuit breaker.

Background

The circuit breaker can produce electric arc in the process of breaking, and the electric arc burns the contact and the metal grid sheet in the arc extinguish chamber to generate a large amount of metal particles, and the particles carry a large amount of heat to enter the contact spring in the contact system, so that the contact spring is heated and melted to deform or damage, the contact counter force is increased rapidly when the circuit breaker is closed, the circuit breaker is difficult to close, and the short circuit connection and breaking capacity of the product is influenced.

As shown in fig. 1 to 3, a low-voltage circuit breaker in the prior art at least includes an operating mechanism 1, an insulating housing 2, a movable contact 3, and a stationary contact 4. The operating mechanism 1 is installed outside the insulating shell 2, and can drive the moving contact 3 installed inside the insulating shell 2 to contact with or separate from the static contact 4 also installed inside the insulating shell 2, so as to realize the connection and disconnection of a circuit. The movable contact 3 at least comprises a current bearing component 31, a contact spring 32 and a contact support 33. The current carrying assembly 31 at least comprises a plurality of movable contact pieces 311 which are arranged in parallel and hinged on the contact support 33 and can pivot relatively, two ends of the contact spring 32 respectively abut against the contact support 33 and the movable contact pieces 311, and the contact support 33 can pivot and swing around a self fulcrum shaft O-O, so that the movable contact pieces 311 are driven to be in contact with or separated from the fixed contacts 4, and the on-off of the circuit breaker is realized.

In the process of opening and closing the circuit breaker, the contact spring 32 is eroded by the high-temperature metal particles generated on the moving contact 3 and the fixed contact 4, so that the contact spring 32 fails, and the performance of the circuit breaker is reduced.

In view of the above-mentioned prior art, there is a need for a reasonable improvement of the structure of the movable contact of the existing circuit breaker. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a moving contact of circuit breaker, its protection architecture who has contact spring, this protection architecture can effectively ensure contact spring and avoid the erosion of metal high temperature particle to have simple structure, characteristics that the life-span is high.

The utility model has the task that the moving contact of the breaker comprises a moving contact piece, a contact spring and a contact support; the contact support swing is arranged in the circuit breaker; the movable contact piece is rotatably arranged on one side of the contact support; one end of the contact spring is abutted against the contact support, and the other end of the contact spring is abutted against the movable contact piece; a spring protection structure is arranged on one side of the contact supporting rotating end and above the contact spring, the spring protection structure comprises a push rod and a push rod spring, one end of the push rod is abutted against one end of the push rod spring, and the other end of the push rod is abutted against the movable contact; the contact support is provided with a matching cavity, the ejector rod spring is accommodated in the matching cavity and is abutted against the matching cavity, and the ejector rod is used for protecting the contact spring from being corroded by metal high-temperature particles.

In a specific embodiment of the present invention, the push rod corresponds to a push rod spring, and the push rod includes a first mating end mated with the push rod spring and a second mating end mated with the movable contact piece.

In another specific embodiment of the present invention, the first mating end is a flat surface and the second mating end is a semi-circular surface.

In another specific embodiment of the present invention, the push rod is a wide structure corresponding to at least two movable contacts.

In another specific embodiment of the present invention, the contact support is provided with a spring accommodating cavity for accommodating the contact spring, the spring accommodating cavity and the matching cavity are respectively arranged in rows, and the matching cavity is located at one side of the spring accommodating cavity close to the rotating end of the contact support.

In another specific embodiment of the present invention, the movable contact is provided with a first cavity, the first cavity is a row, and the first cavity is abutted against and matched with the end of the push rod.

In yet another specific embodiment of the present invention, the movable contact is provided with a second cavity, the second cavity is a row, and the second cavity abuts against and fits with the end of the contact spring.

In a more specific embodiment of the present invention, one row of the first cavity and one row of the second cavity are spaced apart, and one row of the first cavity is located on one side of one row of the second cavity close to the rotating end supported by the contact.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: in the circuit breaker, one side of the contact spring close to the contact supporting rotating end is provided with a spring protection structure, the protection structure can effectively ensure that the contact spring is prevented from being corroded by metal high-temperature particles, and the circuit breaker has the characteristics of simple structure and long service life.

Drawings

Fig. 1 is an exploded view of a circuit breaker according to the prior art.

Fig. 2 is a schematic perspective view of a movable contact of a circuit breaker according to the prior art.

Fig. 3 is a schematic side view of a movable contact of a circuit breaker according to the prior art.

Fig. 4 is an exploded view of the circuit breaker of the present invention.

Fig. 5 is a schematic perspective view of the moving contact of the circuit breaker of the present invention.

Fig. 6 is a side partial sectional view of a moving contact of the circuit breaker.

Fig. 7 is a schematic view of an embodiment of the lift pin of the present invention.

Fig. 8 is a schematic view of another embodiment of the lift pin of the present invention.

Fig. 9 is a schematic perspective view of the contact support of the present invention.

In the figure: 1. an operating mechanism; 2. an insulating housing; 3. the contact terminal comprises a movable contact terminal, a current bearing assembly, a contact spring holder, a movable contact piece, a 3111, a first cavity, a 3112, a second cavity, a contact spring, a 33 contact support, a 331 spring accommodating cavity, a 332 partition plate, a 333 installation cavity, a 334 matching cavity, a 34 ejector rod spring, a 35 ejector rod, a 351, a first matching end and a 352 second matching end; 4. and (7) carrying out static contact.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept relating to the directions or orientations of up, down, left, right, front, and rear is based on the position shown in the corresponding drawings, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 4 to 6, the present invention relates to a moving contact of a circuit breaker, the circuit breaker includes an operating mechanism 1, an insulating housing 2, a moving contact 3, and a stationary contact 4. The insulating housing 2 generally comprises a base and a bottom plate. The base and the bottom plate are mutually spliced to form an inner cavity. In which are mounted a moving contact 3, a stationary contact 4 and an arc extinguishing chamber (not shown). The moving contact 3 and the static contact 4 are oppositely arranged, and the moving contact 3 is contacted with or separated from the static contact 4 after swinging, so that the circuit is switched on or off. The operating mechanism 1 is an energy component of the circuit breaker and is used for providing energy for the moving contact 3 to act.

As shown in fig. 5 and 6, the movable contact 3 includes a current carrying assembly 31, a contact spring 32 and a contact support 33. The current-carrying component 31 is a conductive component, i.e. a current flowing channel. The current carrying assembly 31 includes a moving contact busbar, a flexible connection and a moving contact piece 311. One end of the flexible connection is electrically connected with the moving contact piece 311, and the other end is electrically connected with the moving contact busbar. Generally, the moving contact piece 311 is formed by arranging a plurality of pieces side by side, each piece is connected with one flexible connection, and a plurality of flexible connections are connected to one moving contact busbar. The movable contact piece 311 is rotatably disposed at one side of the contact holder 33.

The contact spring 32 is a resilient member, typically a coil spring. One end of the contact spring 32 abuts against the contact holder 33, and the other end abuts against the movable contact piece 311.

The contact support 33 is an insulative housing, typically made of a thermoset material. The contact support 33 is arranged inside the insulating housing 2 in a pivotable manner. The contact support 33 mounts the current carrying assembly 31. The contact support 33 is pivoted in the insulating housing 2.

The contact holder 33 is provided with the spring receiving cavity 331, and the spring receiving cavity 331 is used for receiving the contact spring 32, that is, the contact spring 32 is disposed in the spring receiving cavity 331.

The utility model discloses an innovation part lies in: a spring protection structure is arranged on one side of the rotating end of the contact support 33 and above the contact spring 32, the spring protection structure comprises a push rod 35 and a push rod spring 34, one end of the push rod 35 is contacted with one end of the push rod spring 34, and the other end of the push rod 35 is contacted with the movable contact piece 311. Due to the presence of the plunger 35, the plunger 35 is located on the rotating end side of the contact spring 32 close to the contact support 33, i.e., above the contact spring 32. Therefore, the metal high-temperature particles generated by the moving contact 3 and the static contact 4 in the working process are shielded by the ejector rod 35 and cannot approach the contact spring 32 positioned on the inner side of the contact support 33, so that the contact spring 32 is protected, and the service life of the contact spring 32 is prolonged.

A fitting cavity 334 is further provided in the contact holder 33, and the fitting cavity 334 is located on the rotating end side of the spring accommodating cavity 331 close to the contact holder 33, that is, above the contact spring 32. The ejector spring 34 is disposed in the matching cavity 334 and abuts against the matching cavity 334.

Referring to fig. 7, in an embodiment of the push rod 35, the push rod 35 is a cylinder corresponding to a push rod spring 34 and a movable contact piece 311. The plunger 35 includes a first mating end 351 that mates with the plunger spring 34 and a second mating end 352 that mates with the movable contact 311.

Preferably, the first mating end 351 is planar so that one end of the push rod spring 34 abuts the first mating end 351. Preferably, the second mating end 352 is a semi-circular surface. At this time, the abutting fit between the mating end 352 and the movable contact piece 311 has smaller friction force, and the abutting is more flexible and reliable.

Referring to fig. 8, in another embodiment of the push rod 35, the push rod 35 is a wide structure corresponding to at least two movable contacts 311. The push rod 35 comprises at least two first mating ends 351, and each first mating end 351 can be abutted and matched with one push rod spring 34; likewise, the top bar 35 includes at least two second mating ends 352. Each second mating end 352 abuttingly mates with a movable contact piece 311.

Fig. 6 and 9 are schematic views of the contact holder 33. The contact holder 33 includes a spring receiving cavity 331 and a mating cavity 334 for receiving the contact spring 32, the mating cavity 334 and the spring receiving cavity 331 are respectively aligned in a row, and the mating cavity 334 is located on one side of the spring receiving cavity 331 near the rotating end of the contact holder 33.

The rows of the ejector springs 34 are all received in the matching cavity 334 in the working process, and cannot be corroded by external high-temperature metal particles.

The contact support 33 is provided with a partition 332. The contact support 33 is further provided with a mounting cavity 333 for mounting the partition 332.

The movable contact piece 311 is provided with a first cavity 3111, the first cavities 3111 are arranged in a row, and the first cavity 3111 is abutted and matched with the end of the push rod 35. Preferably, the movable contact piece 311 is further provided with a second cavity 3112, the second cavities 3112 are arranged in a row, a row of the first cavities 3111 and a row of the second cavities 3112 are arranged at intervals, and a row of the first cavities 3111 is positioned on one side of a row of the second cavities 3112 close to the rotating end of the contact holder 33. The second cavity 3112 is fitted against the end of the contact spring 32.

Claims

1. A moving contact of a circuit breaker, the moving contact (3) comprises a moving contact piece (311), a contact spring (32) and a contact support (33); the contact support (33) is arranged inside the circuit breaker in a swinging mode; the movable contact piece (311) is rotatably arranged on one side of the contact support (33); one end of the contact spring (32) is abutted against the contact support (33), and the other end is abutted against the movable contact piece (311); the method is characterized in that: a spring protection structure is arranged on one side of the rotating end of the contact support (33) and above the contact spring (32), the spring protection structure comprises a push rod (35) and a push rod spring (34), one end of the push rod (35) is abutted against one end of the push rod spring (34), and the other end of the push rod (35) is abutted against the movable contact (311); the contact support (33) is provided with a matching cavity (334), the ejector spring (34) is accommodated in the matching cavity (334) and is abutted against the matching cavity (334), and the ejector rod (35) is used for protecting the contact spring (32) from being corroded by metal high-temperature particles.

2. A movable contact for a circuit breaker as claimed in claim 1, wherein said plunger (35) corresponds to a plunger spring (34), said plunger (35) comprising a first mating end (351) for mating with said plunger spring (34) and a second mating end (352) for mating with said movable contact (311).

3. A movable contact for a circuit breaker as claimed in claim 2 wherein said first mating end (351) is planar and said second mating end (352) is semi-circular.

4. A movable contact for a circuit breaker as claimed in claim 1, wherein said plunger (35) is a wide body structure corresponding to at least two movable contacts (311).

5. A movable contact for a circuit breaker as claimed in claim 1, wherein said contact support (33) is provided with a spring receiving cavity (331) for receiving said contact spring (32), said spring receiving cavity (331) and said mating cavity (334) are respectively aligned in a row, and said mating cavity (334) is located at a side of said spring receiving cavity (331) close to a rotation end of said contact support (33).

6. A movable contact for a circuit breaker as claimed in claim 1, wherein said movable contact (311) is provided with a first cavity (3111), said first cavity (3111) is arranged in a row, and said first cavity (3111) is in abutting engagement with an end of said push rod (35).

7. A movable contact for a circuit breaker as claimed in claim 6, wherein said movable contact (311) is provided with a second cavity (3112), said second cavities (3112) are arranged in a row, and said second cavities (3112) are in abutting engagement with an end portion of said contact spring (32).

8. A movable contact for circuit breakers according to claim 7, characterized in that said row of said first cavities (3111) and said row of said second cavities (3112) are spaced apart and said row of said first cavities (3111) is located on a side of said row of said second cavities (3112) adjacent to a rotation end of said contact support (33).