CN219350124U - Circuit breaker structure with high breaking capacity - Google Patents

Abstract

The utility model discloses a circuit breaker structure with high breaking capacity, and belongs to the technical field of circuit breakers. The movable contact assembly and the fixed contact assembly are correspondingly matched, the movable contact assembly and the fixed contact assembly are arranged on the lower side of a contact opening formed by the movable contact assembly and the fixed contact assembly in a corresponding manner, and at least one part of metal arc extinguishing grid sheet in the arc extinguishing chamber stretches into the inner side of the contact opening formed by the movable contact assembly and the fixed contact assembly in a corresponding manner; the length of part of metal arc-extinguishing grid plates in the arc-extinguishing chamber is 30mm-35mm. Compared with the conventional circuit breaker structure, the circuit breaker structure with high breaking capacity has the advantages of long arc striking distance, short arc extinguishing distance and better breaking capacity.

Description

Circuit breaker structure with high breaking capacity

Technical Field

The utility model belongs to the technical field of circuit breakers, and particularly relates to a circuit breaker structure with high breaking capacity.

Background

The circuit breaker is a low-voltage electric appliance for overload, short circuit, overcurrent, voltage loss and undervoltage protection of a circuit, and can cut off and switch on a load circuit. The moving and static contacts of the miniature circuit breaker can generate electric arcs in the breaking process so as to ensure the running safety of the miniature circuit breaker, and an arc extinguishing system is arranged in the miniature circuit breaker to extinguish the electric arcs generated by the moving and static contacts so as to achieve the arc extinguishing effect. The arc extinguishing structure of the conventional circuit breaker is used for extinguishing arc by introducing the arc into the arc extinguishing chamber, and breakdown can be caused inside a product before the arc enters the arc extinguishing chamber, so that the performance of the product is reduced, and the service life is prolonged.

Disclosure of Invention

1. Problems to be solved

Aiming at the problems that in the prior art, arc is directly led into an arc extinguish chamber to extinguish arc, which causes breakdown inside a product, so that the performance of the product is reduced and the service life is reduced, the utility model provides a circuit breaker structure with high breaking capacity.

2. Technical proposal

In order to solve the problems, the utility model adopts the following technical scheme.

The circuit breaker structure with high breaking capacity comprises a moving contact assembly and a fixed contact assembly which are correspondingly matched, and further comprises an arc extinguishing chamber, wherein the arc extinguishing chamber is arranged at the lower side of a contact opening formed by the moving contact assembly and the fixed contact assembly in a relative manner, and at least one part of metal arc extinguishing gate sheets in the arc extinguishing chamber extend into the inner side of the contact opening formed by the moving contact assembly and the fixed contact assembly in a relative manner;

an electromagnetic system is arranged above the arc extinguishing chamber and at least comprises an iron core which can move when driven by magnetic field acting force, and at least one part of the moving contact assembly is positioned on the moving path of the iron core;

if the circuit breaker is in a closing state, when short-circuit current occurs in the arc extinguishing chamber, a magnetic field in the electromagnetic system is enhanced, the iron core moves along a moving path of the iron core and is contacted with the moving contact assembly, the moving contact assembly rotates under the acting force of the iron core, so that the moving contact assembly and the fixed contact assembly are separated, and the circuit breaker is converted from the closing state to the opening state;

the length of part of metal arc-extinguishing grid plates in the arc-extinguishing chamber is 30mm-35mm.

Preferably, the movable contact assembly comprises a first component and a second component which are connected with each other, the first component is rotatably arranged, and the second component is positioned on the moving path of the iron core.

Preferably, the device further comprises a rotatable operating handle, wherein the operating handle is linked with the first component;

when the operating handle rotates, the moving contact assembly rotates under the drive of the operating handle, so that the moving contact assembly and the fixed contact assembly are contacted with or separated from each other, and the circuit breaker structure is switched between a closing state and a breaking state.

Preferably, the device further comprises an inlet wire end and an outlet wire end, wherein the inlet wire end is connected with a wire of the moving contact assembly, and the outlet wire end is connected with the fixed contact assembly.

3. Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

according to the circuit breaker structure with high breaking capacity, if the circuit breaker is in a closing state, when short-circuit current occurs, a magnetic field in an electromagnetic system is increased, an iron core moves under the action of the magnetic field and contacts a moving contact assembly, the moving contact assembly starts to rotate under the action of the iron core, so that a moving contact is separated from a fixed contact assembly, and the circuit breaker is further converted into a breaking state from the closing state; at this time, for the arc generated when the circuit breaker is switched from the closing state to the opening state, as the length of part of the metal arc extinguishing grid sheets in the arc extinguishing chamber is 30mm-35mm, the part of the metal arc extinguishing grid sheets can extend into the inner side of a contact port formed by the moving contact assembly and the fixed contact assembly relatively, at this time, the arc is not led into the arc extinguishing chamber through the fixed contact assembly conventionally, but directly enters the arc extinguishing chamber with a very close arc generating position, and the arc is split after entering the arc extinguishing chamber until the arc is extinguished. Compared with the conventional circuit breaker structure, the circuit breaker structure in the application has the advantages of long arc striking distance, short arc extinguishing distance and better breaking capacity.

Drawings

Fig. 1 is a schematic structural diagram of a circuit breaker with high breaking capacity according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a conventional arc extinguishing chamber;

fig. 3 is a schematic diagram of an arc extinguishing chamber according to an embodiment of the present utility model;

in the figure: 100. a moving contact assembly; 200. a stationary contact assembly; 300. an arc extinguishing chamber; 400. an electromagnetic system; 500. an operation handle; 600. a wire inlet end; 700. a wire outlet end; 800. a circuit breaker housing.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "inner", "outer", "upper", "lower", "horizontal", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. Features of the embodiments described below may be combined with each other without conflict.

Referring to fig. 1 to 3, the present embodiment provides a circuit breaker structure with high breaking capacity, which includes a moving contact assembly 100 and a fixed contact assembly 200, an arc extinguishing chamber 300, an electromagnetic system 400, a rotatable operating handle 500, a wire inlet end 600 and a wire outlet end 700 which are correspondingly matched, wherein the moving contact assembly 100 and the fixed contact assembly 200, the arc extinguishing chamber 300, the electromagnetic system 400, the wire inlet end 600 and the wire outlet end 700 are disposed in a circuit breaker housing 800, the operating handle 500 is fixed in the circuit breaker housing 800 and can rotate relative to the housing, the wire inlet end 600 is connected with a wire of the moving contact assembly 100, and the wire outlet end 700 is connected with the fixed contact assembly 200.

The moving contact assembly 100 includes a first component and a second component that are connected to each other, the first component and the second component being structural members, the first component being rotatable relative to the circuit breaker housing 800.

The operation handle 500 is coupled to the first member. When the operation handle 500 rotates, the moving contact assembly 100 rotates under the driving of the operation handle 500, so that the moving contact assembly 100 and the fixed contact assembly 200 contact each other or are far away from each other, and the circuit breaker structure completes the switching between the switching-on state and the switching-off state.

The length of the metal arc extinguishing bars in the conventional arc extinguishing chamber is generally about 25 mm. In this embodiment, the arc extinguishing chamber 300 is disposed at a lower side of a contact opening formed by the moving contact assembly 100 and the fixed contact assembly 200, and the length of a part of metal arc extinguishing gate sheets in the arc extinguishing chamber is 30mm-35mm, so that the part of metal arc extinguishing gate sheets can extend into an inner side of the contact opening formed by the moving contact assembly 100 and the fixed contact assembly 200.

The electromagnetic system 400 includes at least a core that is movable when driven by a magnetic field force, and at least a portion of the moving contact assembly 100 is positioned in a path of movement of the core, and more particularly, the second component is positioned in the path of movement of the core.

If the circuit breaker is in a closing state, when a short-circuit current occurs in the arc extinguishing chamber 300, the magnetic field in the electromagnetic system 400 is enhanced, the iron core moves along the moving path thereof and contacts the moving contact assembly 100, the moving contact assembly 100 rotates under the acting force of the iron core, so that the moving contact assembly 100 and the fixed contact assembly 200 are separated from each other, and the circuit breaker is converted from a closing state to a separating state.

In the circuit breaker structure with high breaking capacity in this embodiment, if the circuit breaker is in a closing state, when a short-circuit current occurs, a magnetic field in the electromagnetic system 400 increases, the iron core moves under the action of the magnetic field and contacts the moving contact assembly 100, and the moving contact assembly 100 starts to rotate under the action of the iron core, so that the moving contact is separated from the fixed contact assembly 200, and the circuit breaker is further converted from the closing state to the opening state; at this time, for the arc generated when the circuit breaker is switched from the closing state to the opening state, in the present application, the length of a part of metal arc extinguishing gate sheets in the arc extinguishing chamber is 30mm-35mm, and the part of metal arc extinguishing gate sheets can extend into a contact opening formed by the moving contact assembly and the fixed contact assembly relatively, at this time, the arc is not led into the arc extinguishing chamber 300 through the fixed contact assembly 200 in a conventional manner, but directly enters the arc extinguishing chamber 300 close to the arc generating position, and the arc is split after entering the arc extinguishing chamber 300 until the arc is extinguished. Compared with the conventional circuit breaker structure, the circuit breaker structure in the application has the advantages of long arc striking distance, short arc extinguishing distance and better breaking capacity.

The examples of the present utility model are merely for describing the preferred embodiments of the present utility model, and are not intended to limit the spirit and scope of the present utility model, and those skilled in the art should make various changes and modifications to the technical solution of the present utility model without departing from the spirit of the present utility model.

Claims (4)

1. The circuit breaker structure with high breaking capacity comprises a moving contact assembly and a fixed contact assembly which are correspondingly matched, and is characterized in that: the metal arc extinguishing grid plate is arranged on the inner side of the contact opening formed by the moving contact assembly and the fixed contact assembly in a corresponding manner;

an electromagnetic system is arranged above the arc extinguishing chamber and at least comprises an iron core which can move when driven by magnetic field acting force, and at least one part of the moving contact assembly is positioned on the moving path of the iron core;

if the circuit breaker is in a closing state, when short-circuit current occurs in the arc extinguishing chamber, a magnetic field in the electromagnetic system is enhanced, the iron core moves along a moving path of the iron core and is contacted with the moving contact assembly, the moving contact assembly rotates under the acting force of the iron core, so that the moving contact assembly and the fixed contact assembly are separated, and the circuit breaker is converted from the closing state to the opening state;

the length of part of metal arc-extinguishing grid plates in the arc-extinguishing chamber is 30mm-35mm.

2. A circuit breaker structure with high breaking capacity according to claim 1, characterized in that the moving contact assembly comprises a first part and a second part connected to each other, the first part being rotatably arranged and the second part being located in the movement path of the iron core.

3. The circuit breaker structure with high breaking capacity according to claim 2, further comprising a rotatable operating handle, said operating handle being interlocked with said first component;

when the operating handle rotates, the moving contact assembly rotates under the drive of the operating handle, so that the moving contact assembly and the fixed contact assembly are contacted with or separated from each other, and the circuit breaker structure is switched between a closing state and a breaking state.

4. The circuit breaker structure with high breaking capacity according to claim 1, further comprising an incoming line end and an outgoing line end, wherein the incoming line end is connected with a moving contact assembly wire, and the outgoing line end is connected with the fixed contact assembly.

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