CN214624954U

CN214624954U - Circuit breaker

Info

Publication number: CN214624954U
Application number: CN202121028137.XU
Authority: CN
Inventors: 管瑞良; 林佳; 周敏琛
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-11-05
Anticipated expiration: 2031-05-14

Abstract

A circuit breaker belongs to the technical field of low-voltage electrical appliances. Including casing, operating device, contact system and explosion chamber, the casing include base and bottom plate, base and bottom plate concatenation form the casing, the inside of this casing is hollow cavity, contact system be located the cavity of this casing, the explosion chamber install the opening side of casing top, operating device install in the outside of base and with contact system corresponding, the explosion chamber follow the inboard of bottom plate to operating device's top extends, this explosion chamber covers contact system's top and at least part operating device's top. The advantages are that: the installation volume of the arc extinguish chamber is enlarged, the layout is reasonable, the universal direct current circuit breaker is suitable, and the miniaturization of the circuit breaker is facilitated.

Description

Circuit breaker

Technical Field

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

Background

The low-voltage universal circuit breaker is a component of low-voltage electrical equipment with large capacity, is mainly used in an industrial power system, can ensure the connection and disconnection of a circuit under rated load, and automatically disconnects the circuit under abnormal circuit conditions (such as overload, short circuit, undervoltage and the like), and cuts off the circuit by separating moving contacts and static contacts to completely isolate the load from a power supply.

With the rapid development of new energy industries (wind power, solar energy and the like), communication industries and rail transit industries, direct current technologies and direct current distribution networks are also increasingly widely applied, and therefore more direct current loops are needed to be adopted in a direct current system to protect electric appliances so as to provide comprehensive protection and monitoring for a direct current power grid. The direct current breaker is a very important protection electric appliance in a direct current power grid.

The conventional universal direct-current circuit breaker is usually realized by strengthening an arc extinguish chamber and a contact system and replacing a signal acquisition device for detecting fault current on the basis of an alternating-current circuit breaker, and is not suitable for the demand environment of the direct-current circuit breaker due to the influence of an original alternating-current circuit breaker frame. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

Disclosure of Invention

The utility model aims at providing a circuit breaker, it has enlarged the volume of explosion chamber installation, has rationally distributed, is fit for omnipotent direct current circuit breaker, is favorable to realizing the miniaturization of circuit breaker.

The utility model discloses a task is accomplished like this, a circuit breaker, including casing, operating device, contact system and explosion chamber, the casing include base and bottom plate, base and bottom plate concatenation form the casing, the inside of this casing is hollow cavity, contact system be located the cavity of this casing, the explosion chamber install the opening side of casing top, operating device install in the outside of base and with contact system corresponding, the explosion chamber follow the inboard of bottom plate to operating device's top extends, this explosion chamber covers contact system's top and at least part operating device's top.

In a specific embodiment of the present invention, the arc extinguishing chamber covers directly above the operating mechanism.

In another specific embodiment of the present invention, the cavity of the housing includes an arc-extinguishing chamber located at the upper portion and a contact accommodating chamber located at the lower portion, the contact accommodating chamber communicates with the arc-extinguishing chamber, and the arc-extinguishing chamber has a length greater than the length of the arc-extinguishing chamber in the front-rear direction of the circuit breaker.

In another specific embodiment of the present invention, the arc-extinguishing chamber holds the chamber and the contact holds the chamber and is formed by the base and the bottom plate splicing enclosure, wherein the arc-extinguishing chamber holds the chamber and is used for holding the arc-extinguishing chamber, and the contact holds the chamber and is used for holding the contact system.

In another embodiment of the present invention, the housing has a substantially "" shape.

In still another specific embodiment of the present invention, the arc extinguishing chamber accommodates the chamber and the contact accommodates the chamber to flush at the rear side of the front-rear direction of the circuit breaker.

The utility model discloses because will the explosion chamber from the inboard of bottom plate to operating device's top is extended, this explosion chamber covers contact system's top and at least part operating device's top has enlarged the volume of explosion chamber installation like this, makes the explosion chamber can hold more permutation's bars piece to this satisfies direct current circuit breaker's arc extinguishing demand.

Drawings

Fig. 1 shows a schematic front view of a circuit breaker according to the present invention.

Fig. 2 shows a cross-sectional view of a side of a circuit breaker according to the present invention.

Fig. 3 shows a schematic back view of a circuit breaker according to the present invention.

In the figure: 1. an operating mechanism; 2. the contact system comprises a contact system, 21 moving contacts, 211 moving contact rows and 22 fixed contacts; 3. an arc extinguishing chamber; 100. the contact-making device comprises a shell, 1001, a base, 1002, a bottom plate, 1003, an arc extinguish chamber accommodating cavity and 1004, a contact accommodating cavity; 200. and (4) discharging the wire.

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, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position shown in fig. 1, and thus, should not be interpreted as a specific limitation to the technical solution provided by the present invention.

Fig. 1, a front schematic view of the circuit breaker. The circuit breaker comprises a shell 100, and an operating mechanism 1 is installed outside the shell 100.

The housing 100 generally includes a base 1001 and a bottom plate 1002, and the base 1001 and the bottom plate 1002 are joined together to form the housing 100. The interior of the housing 100 is a hollow cavity. Typically, the base 1001 and the bottom plate 1002 are made of a thermosetting material, such as DMC, BMC, etc.

The operating mechanism 1 is a driving part of the circuit breaker, and the operating mechanism 1 drives the contact system 2 to act. The operating mechanism 1 is mounted on the outside of the base 1001.

As shown in fig. 1, 2 and 3, a contact system 2 is installed in a cavity inside the housing 100, and the contact system 2 is an important component of the circuit breaker. The contact system 2 comprises a movable contact 21 and a stationary contact 22. The movable contact 21 is arranged on the base 1001 in a swinging manner, and the fixed contact 22 is fixedly arranged on the bottom plate 1002. The movable contact 21 and the fixed contact 22 are closed or separated. The arc extinguishing chamber 3 is installed on the opening side above the housing 100, and the operating mechanism 1 is installed on the outer side of the base 1001 and corresponds to the contact system 2.

As the technical scheme provided by the utility model: the arc chute 3 extends from the inner side of the bottom plate 1002 to the upper side of the operating mechanism 1, and the arc chute 3 covers the upper side of the contact system 2 and at least a part of the upper side of the operating mechanism 1. Preferably, the arc extinguishing chamber 3 covers the operating mechanism 1 directly above.

The movable contact 21 is extended through the bottom plate 1002, and the movable contact bar 211 of the movable contact 21 extended through the bottom plate 1002 is used as a connecting bar for a circuit breaker and an external connection. The static contact row of the static contact 22 is embedded into the corresponding through cavity on the bottom plate 1002, and an outlet row 200 is installed outside the bottom plate 1002 and electrically connected with the static contact row. Thus, the outlet line bank 200, the fixed contact 22 and the movable contact 21 form a current path inside the circuit breaker.

An arc extinguish chamber 3 is arranged above the contact system 2, and in the technical scheme, the length of the arc extinguish chamber is larger than the length of the shell corresponding to the front and back directions of the shell of the contact system 2. Since the circuit breaker described in this embodiment includes three isolated pole contact systems 2, each contact system 2 includes a moving contact 21 and a stationary contact 22. An arc extinguishing chamber 3 is arranged above each group of moving contacts 21 and static contacts 22. In order to meet the requirements of a dc circuit breaker, the arc chute 3 has a longer length in the front-rear direction than the arc chute of an ac circuit breaker. Therefore, the arc extinguishing chamber 3 can accommodate more columns of grids, so as to meet the arc extinguishing requirement of the direct current circuit breaker.

As seen from the side of the circuit breaker in fig. 2, the operating mechanism 1 is at least partially located below the arc chute 3. That is, the arc extinguishing chamber 3 is located above the contact system 2 and the operating mechanism 1.

In order to satisfy the installation requirement of the arc extinguish chamber 3, the housing 100 is substantially "" shaped, and the length of the upper portion of the housing 100 is larger than the length of the lower portion thereof in the front-rear direction. The cavity of the housing 100 includes an arc extinguishing chamber accommodating cavity 1003 at an upper portion and a contact accommodating cavity 1004 at a lower portion, and the length of the arc extinguishing chamber accommodating cavity 1003 in the front-rear direction of the circuit breaker is greater than that of the contact accommodating cavity 1004 in the front-rear direction of the circuit breaker. Preferably, the arc extinguishing chamber accommodating cavity 1003 and the contact accommodating cavity 1004 are flush with each other at the rear side in the front-rear direction of the circuit breaker. The arc chute receiving cavity 1003 is in communication with the contact receiving cavity 1004, so that the arc generated in the contact system 2 can enter the grid array in the arc chute 3 located in the arc chute receiving cavity 1003.

Preferably, the arc extinguishing chamber accommodating cavity 1003 and the contact accommodating cavity 1004 are spliced, that is, spliced and enclosed by the base 1001 and the bottom plate 1002. Of course, other forms are possible, such as the arc chamber housing 1003 being integrally formed by a separate mold, and covering the lower base 1001 and bottom 1002, and being fixed as one body.

In fig. 1, the operating mechanism 1 is mounted on the front surface of the housing 100, specifically, on the outer side of the base 1001. Because the explosion chamber that holds explosion chamber 3 holds chamber 1003 and can lean out forward, be fit for holding the bigger explosion chamber 3 of length, be fit for direct current circuit breaker's demand.

Claims

1. The utility model provides a circuit breaker, includes casing (100), operating device (1), contact system (2) and explosion chamber (3), casing (100) include base (1001) and bottom plate (1002), base (1001) and bottom plate (1002) concatenation form casing (100), the inside of this casing (100) is hollow cavity, contact system (2) be located the cavity of this casing (100), explosion chamber (3) install the opening side of casing (100) top, operating device (1) install in the outside of base (1001) and with contact system (2) corresponding, its characterized in that: the arc-extinguishing chamber (3) extends from the inner side of the bottom plate (1002) to the upper part of the operating mechanism (1), and the arc-extinguishing chamber (3) covers the upper part of the contact system (2) and at least part of the upper part of the operating mechanism (1).

2. A circuit breaker according to claim 1, characterized in that said arc extinguishing chamber (3) covers directly above said operating mechanism (1).

3. A circuit breaker according to claim 1, wherein the chamber of said housing (100) comprises an arc extinguishing chamber accommodating chamber (1003) at an upper portion and a contact accommodating chamber (1004) at a lower portion, said contact accommodating chamber (1004) and said arc extinguishing chamber accommodating chamber (1003) communicate with each other, and a length of said arc extinguishing chamber accommodating chamber (1003) in a front-rear direction of the circuit breaker is greater than a length of said contact accommodating chamber (1004) in the front-rear direction of the circuit breaker.

4. A circuit breaker according to claim 3, wherein said arc chute receiving chamber (1003) and said contact receiving chamber (1004) are formed by splicing and enclosing said base (1001) and said bottom plate (1002), wherein said arc chute receiving chamber (1003) is used for receiving said arc chute (3), and said contact receiving chamber (1004) is used for receiving said contact system (2).

5. The circuit breaker as claimed in claim 1, wherein said housing (100) is substantially "l" -shaped.

6. A circuit breaker according to claim 3, characterized in that said arc extinguishing chamber accommodating chamber (1003) and said contact accommodating chamber (1004) are flush with each other at the rear side in the front-rear direction of the circuit breaker.