CN217822644U - Static contact assembly and circuit breaker - Google Patents

Abstract

The utility model discloses a static contact subassembly, a serial communication port, including connection board, the reverse portion of bending and run-on arc piece reverse be equipped with the stationary contact in the portion of bending, the run-on arc piece includes connecting portion, the portion of bending and leads the arc portion, connecting portion set firmly in the below of the reverse portion of bending, the portion of bending upwards protruding to with the roughly parallel and level of stationary contact is bent downwards again to the top of connection board, lead the arc portion with the connection board is roughly parallel. The utility model discloses can effectively promote the arcing voltage when the circuit breaker divides absolutely, make electric arc extinguish fast, promote the circuit breaker breaking capacity, the space of stationary contact to between the static contact connection board can obtain make full use of.

Description

Static contact assembly and circuit breaker

Technical Field

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

Background

The low-voltage circuit breaker plays a main role in protecting a circuit system when a circuit has a short-circuit fault, and mainly comprises a shell, a static contact, a moving contact, an arc extinguish chamber, an operating mechanism and the like. When the circuit has short-circuit fault, the circuit breaker is tripped to separate the moving contact and the fixed contact so as to generate electric arc between the moving contact and the fixed contact, and the electric arc enters the arc extinguish chamber under the action of the magnetic field and is cut into a plurality of short arcs by the grid sheet of the arc extinguish chamber. Because of the near-pole voltage drop of each short arc, the arc voltage is rapidly increased, the more the grid sheets are, the more the short arcs are formed, the higher the arc voltage is, the increased arc voltage can rapidly reduce the arc current, and finally, the arc is extinguished to cut off a fault circuit. Therefore, it is important to arrange as many arc-extinguishing grids as possible in the limited space of the circuit breaker and arrange the arc striking plates so that each grid can be fully utilized.

Fig. 1 is a structural diagram of a fixed contact in patent CN 204155889U, which mainly includes an arc striking plate integrally formed from a ferromagnetic material and a fixed contact fixed to the arc striking plate; the arc striking plate is located the tip of static contact, including hugging closely the magnetic induction portion of static contact tip downside, connect the magnetic induction portion and upwards buckle and hug closely the kink of static contact tip to and connect the kink and to the arc striking portion that circuit breaker explosion chamber one side extended. The drawbacks of this structure are as follows:

1) And the static contact arc striking plate horizontally extends forwards to the bottom of the arc extinguish chamber, namely, the arc extinguish chamber grid plate is arranged above the arc striking plate, so that the space between the static contact and the static contact connecting plate in the height direction is not fully utilized.

2) The static contact is separated between the static contact arc striking piece and the static contact of the circuit breaker in the prior art, the static contact arc striking piece is far away from the static contact, the magnetic field enhancement effect of the static contact arc striking piece on the position of the static contact is not obvious, in the breaking process of the circuit breaker, electric arc is firstly generated between the contacts of the driven static contact, electric arc roots are respectively arranged on the static contact and the static contact, if the magnetic field intensity of driving electric arc is not enough, the electric arc roots cannot be transferred to the arc striking piece from the static contact, the burning loss of the static contact is serious, and even the bad consequence that the circuit breaker cannot be switched on after breaking occurs.

Disclosure of Invention

To sum up, the utility model aims at providing a static contact subassembly can effectively customer service above-mentioned problem.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a static contact component comprises a connecting plate, a reverse bending portion and an arc striking piece, wherein a static contact is arranged on the reverse bending portion, the arc striking piece comprises a connecting portion, a bending portion and an arc guiding portion, the connecting portion is fixedly arranged below the reverse bending portion, the bending portion protrudes upwards to be approximately flush with the static contact, and then the bending portion bends downwards to be above the connecting plate.

In a preferred embodiment, the arc guide portion is substantially parallel to the coupling plate.

In a preferred embodiment, a magnetism increasing part is arranged on the connecting part of the arc striking piece, and the magnetism increasing part protrudes out of the connecting part.

In a preferred embodiment, the height of the magnetism increasing part is flush with the static contact.

In a preferred embodiment, the number of the magnetism increasing portions is 2, and the magnetism increasing portions are respectively arranged on two sides of the fixed contact.

In a preferred embodiment, the connecting portion, the bending portion and the arc guiding portion are integrally formed.

In a preferred embodiment, the arc striking plate is made of ferromagnetic material.

In a preferred embodiment, an insulating plate is disposed between the arc guide portion and the coupling plate.

On the other hand, the utility model also discloses a circuit breaker, including shell, arc extinguishing system, as above static contact subassembly, moving contact subassembly and operating device, arc extinguishing system, static contact subassembly, moving contact subassembly and operating device locate in the shell.

In a preferred embodiment, the arc extinguishing system is arranged above the arc guide part, and the arc guide part is approximately parallel to the bottom grid of the arc extinguishing system.

The utility model adopts the above scheme, compare prior art and have following advantage:

when a short-circuit fault exists in a circuit, the circuit breaker is tripped to separate movable contacts and static contacts, electric arcs are generated between the movable contacts and the static contacts, arc roots, close to the static contacts, of the electric arcs are transferred to the arc striking plates from the static contacts under the action of electromagnetic force generated by conductors such as the static contact connecting plates, along with downward bending of the arc striking plates, arc roots, close to the static contacts, of the electric arcs are transferred to the arc guiding portions at the tail ends of the arc striking plates along the bending portions, grid pieces arranged below an arc extinguishing system at the positions from the static contacts to the static contact connecting plates smoothly participate in cutting the electric arcs, arc burning voltage when the circuit breaker is broken is improved, the electric arcs are extinguished quickly, breaking capacity of the circuit breaker is improved, and space between the static contacts and the static contact connecting plates can be fully utilized.

The striking piece sets up in the stationary contact both sides and increases magnetism portion, and its height flushes or tends to flush with the stationary contact, and its benefit is the magnetic field of increase stationary contact position, makes the breaker divide the disconnected in-process, and the arc root can be followed the stationary contact fast and shifted to on the striking piece to alleviate the stationary contact scaling loss, avoid appearing dividing the bad consequence that the back circuit breaker combined floodgate can't switch on of dividing.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art stationary contact structure.

Fig. 2 is the schematic diagram of the internal structure of the circuit breaker of the present invention.

Fig. 3 is a schematic view of the static contact structure of the present invention.

Fig. 4 is a schematic view of the arc striking plate of the present invention.

Detailed Description

The following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, enables the advantages and features of the invention to be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.

Referring to fig. 2 to 4, the present invention discloses a circuit breaker, which mainly includes: the arc extinguishing system 200, the static contact assembly 300, the movable contact assembly 400 and the operating mechanism 500 are arranged in the shell 100, the static contact assembly 300, the movable contact assembly 400 and the operating mechanism 500 are fixed on the static contact assembly 300, the movable contact assembly 400 is provided with the movable contact 410, the movable contact 410 of the movable contact assembly 400 is in contact with or separated from the static contact 321 of the static contact assembly 300 under the driving of the operating mechanism 500, so that the connection or disconnection of a circuit is realized, and the arc extinguishing system 200 is used for extinguishing electric arcs generated when the movable contact assembly 400 and the static contact assembly 300 are disconnected, so that the safety of an electric appliance is ensured.

Specifically, the static contact assembly 300 includes a connection plate 310 and a reverse bending portion 320, the connection plate 310 is fixedly connected to an external conductive copper bar through a screw, the static contact 321 is disposed on the reverse bending portion 320, when a circuit is connected, a current is transmitted to the static contact assembly 300 through the conductive copper bar, and the static contact 321 contacts with the movable contact 410 of the movable contact assembly 400, so as to achieve the conduction of the circuit.

The arc striking plate 330 is disposed on the static contact component 300, the arc striking plate 320 is fixedly connected to the static contact component 300, and an arc generated when the moving contact component 400 and the static contact component 300 are disconnected can enter the arc extinguishing system 200 along the arc striking plate 320, so as to achieve a better arc extinguishing effect. Specifically, the arc striking plate 330 includes a connecting portion 331, a bending portion 332, and an arc guiding portion 333, which are integrally formed, and the bending portion 332 is disposed between the connecting portion 331 and the arc guiding portion 333. The connecting portion 331 is disposed below the fixed contact 321, and is fixedly connected to the reverse bending portion 320 through a screw, and through holes for accommodating the screws to pass through are correspondingly disposed on the reverse bending portion 320 and the connecting portion 331, so that the arc striking plate 330 is fixed. The bending portion 332 is disposed at the front end of the reverse bending portion 320, protrudes upward to be substantially flush with the stationary contact 321, and is bent downward to be above the coupling plate 310, and the arc guiding portion 333 sinks to be parallel or nearly parallel to the coupling plate 310, that is: the angle between the arc guiding part 333 and the coupling plate 310 may be 0-5 degrees, preferably 0 degree. The arc extinguishing system 200 is disposed above the arc guiding portion 333. It should be noted that the arc guiding portion 333 is not in contact with the coupling plate 310, and a gap is provided therebetween, and in a preferred embodiment, an insulating plate may be provided between the arc striking plate 330 and the coupling plate 310 to separate them. The bending part 332 is arranged to be a downward bending structure, so that more installation spaces can be provided for the grids of the arc extinguishing system 200, the number of the grids is increased, the arc extinguishing capacity and the space utilization rate of the arc extinguishing system 200 are improved, the arc guide part 333 is arranged below the bottom grids of the arc extinguishing system 200 and is parallel to the bottom grids, electric arcs can be quickly introduced into the arc extinguishing system 200 to be extinguished, and the arc burning effect is improved.

In this embodiment, the connecting portion 331 is further provided with a magnetism increasing portion 334, the magnetism increasing portion 334 protrudes from the connecting portion 331, is disposed on two sides of the stationary contact 321, and has a height flush with or close to the stationary contact 321. The magnetizing unit 334 and the connecting unit 331 are integrally formed, and the arc striking plate 320 is made of a ferromagnetic material. The number of the magnetization portions 334 may be one or more, and in this embodiment, the number of the magnetization portions 334 is 2, and the magnetization portions are respectively disposed on two sides of the stationary contact 321.

When a short-circuit fault exists in a line, the circuit breaker is tripped to separate movable contacts and static contacts, meanwhile, electric arcs are generated between the movable contacts and the static contacts, under the action of electromagnetic force generated by conductors such as a static contact connecting plate 310, arc roots of the electric arcs close to the static contact 300 side are transferred to the arc striking plates 330 from the static contacts 321, along with downward bending of the arc striking plates 330, the arc roots of the electric arcs close to the static contact 300 side are transferred to the arc guide portions 333 at the tail ends of the arc striking plates 330 along the bending portions 332, at the moment, grid pieces below the arc extinguishing system 200 arranged from the static contacts 321 to the static contact connecting plate 310 smoothly participate in arc cutting, arc burning voltage when the circuit breaker is disconnected is improved, the electric arcs are rapidly extinguished, the circuit breaker breaking capacity is improved, and the space between the static contacts and the static contact connecting plate can be fully utilized.

The arc striking piece 330 is provided with the magnetism increasing parts 334 at two sides of the fixed contact 321, the height of the magnetism increasing parts is flush with or tends to be flush with the fixed contact 321, and the magnetic field at the position of the fixed contact 321 is increased, so that in the breaking process of the circuit breaker, an arc root can be quickly transferred to the arc striking piece 330 from the fixed contact 321, the burning loss of the fixed contact 321 is reduced, and the adverse effect that the circuit breaker cannot be switched on after breaking is avoided.

As used in this specification and the appended claims, the terms "comprises" and "comprising" are intended to only encompass the explicitly identified steps and elements, which do not constitute an exclusive list, and that a method or apparatus may include other steps or elements. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.

It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the description of the upper, lower, left, right, etc. used in the present invention is only relative to the mutual positional relationship of the components of the present invention in the drawings.

It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous.

The above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and are a preferred embodiment, which aims to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and can not limit the protection scope of the present invention. All equivalent changes or modifications made according to the principles of the present invention are intended to be covered by the scope of the present invention.

Claims (10)

1. A static contact assembly is characterized by comprising a connecting plate, a reverse bending portion and an arc striking piece, wherein a static contact is arranged on the reverse bending portion, the arc striking piece comprises a connecting portion, a bending portion and an arc guiding portion, the connecting portion is fixedly arranged below the reverse bending portion, the bending portion protrudes upwards to be approximately flush with the static contact, and then the bending portion bends downwards to be arranged above the connecting plate.

2. The static contact assembly as claimed in claim 1, wherein the arc-guiding portion is substantially parallel to the connecting plate.

3. The static contact assembly as claimed in claim 1, wherein a magnetism increasing portion is disposed on the connecting portion of the arc striking plate, and the magnetism increasing portion protrudes from the connecting portion.

4. The static contact assembly as claimed in claim 3, wherein the height of the magnetism increasing portion is flush with the static contact.

5. The static contact assembly as claimed in claim 3 or 4, wherein the number of the magnetization portions is 2, and the magnetization portions are respectively disposed on two sides of the static contact.

6. The static contact assembly as claimed in claim 1, wherein the connecting portion, the bending portion and the arc guiding portion are integrally formed.

7. The static contact assembly as set forth in claim 1 wherein said arc runner is made of a ferromagnetic material.

8. The static contact assembly as claimed in claim 1, wherein an insulating plate is disposed between the arc-guiding portion and the connecting plate.

9. A circuit breaker comprising a housing, an arc quenching system, the stationary contact assembly of any of claims 1 to 7, the movable contact assembly and an operating mechanism, the arc quenching system, the stationary contact assembly, the movable contact assembly and the operating mechanism being disposed within the housing.

10. The circuit breaker of claim 9, wherein the arc quenching system is disposed above the arc guiding portion, and the arc guiding portion is substantially parallel to a bottom grid of the arc quenching system.

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