CN112151338B

CN112151338B - Arc extinguishing device of molded case circuit breaker and molded case circuit breaker

Info

Publication number: CN112151338B
Application number: CN202010919989.1A
Authority: CN
Inventors: 张建楠; 孔国威; 魏杰; 栾元杰; 刘新; 李萍
Original assignee: Jebet Electric Co ltd; Beijing Sojo Electric Co Ltd
Current assignee: Jebet Electric Co ltd; Beijing Sojo Electric Co Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2022-07-12
Anticipated expiration: 2040-09-04
Also published as: CN112151338A

Abstract

The invention discloses an arc-extinguishing device of a molded case circuit breaker and the molded case circuit breaker, wherein the molded arc-extinguishing device comprises an arc-extinguishing chamber, a white steel paperboard and an arc-isolating piece which are sequentially connected, the arc extinguishing chamber comprises arc extinguishing grid sheets and clamping plates on two sides, the arc extinguishing grid sheets comprise U-shaped sheets at the front ends and W-shaped pieces at the rear ends, the U-shaped piece is opened towards the coming direction of the electric arc, the W-shaped piece is provided with uniform small holes, the clamping plates are clamped at two sides of the U-shaped sheet, the bottom surface of the W-shaped piece is vertical to the clamping plates, one side surface of the W-shaped piece is attached to the bottom surface of the U-shaped piece, the white steel paperboard is U-shaped, one side surface of the white steel paperboard is attached to the outer side surface of the W-shaped part, the arc isolating piece is U-shaped, and one side surface of the arc isolating piece is attached to the outer side surface of the white steel paperboard. The arc extinguishing device has the advantages of simple structure, low cost and good arc extinguishing effect.

Description

Arc extinguishing device of molded case circuit breaker and molded case circuit breaker

Technical Field

The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing device of a molded case circuit breaker and the molded case circuit breaker.

Background

Nowadays, people's life can not leave electric energy, and various protectors for protecting circuits are produced by oneself. The molded case circuit breaker is one of common circuit protectors and is used for circuit overload short-circuit protection, namely, when a circuit is short-circuited or overloaded, a tripping mechanism of the molded case circuit breaker automatically cuts off the circuit to protect the circuit. In the process of cutting off the circuit, a large amount of electric arcs can be generated, the generation of the electric arcs is accompanied with high temperature and high voltage, if the electric arcs are evacuated and arc-extinguished in time, the molded case circuit breaker is easy to break down or burn, and the breaking capacity of the molded case circuit breaker is seriously influenced.

The impact wave is generated when a large current or a short circuit is cut off, and unacceptable cut-off explosion noise is generated to influence the use environment of the circuit breaker; in addition, the cracking of the molded case circuit breaker is caused, and the fatigue damage of the parts of the molded case circuit breaker is caused after long-term and repeated discharge work, so that the reliability of the circuit breaker is influenced, and the service life is shortened. And meanwhile, the large current of the molded case circuit breaker is cut off, so that rapid arc extinction is difficult to realize, and the cut-off failure is caused when the molded case circuit breaker is re-struck behind an arc.

Disclosure of Invention

The invention aims to provide an arc extinguishing device of a molded case circuit breaker and the molded case circuit breaker.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a moulded case circuit breaker's arc control device, is including the explosion chamber, white steel cardboard and the arc piece that connect gradually, the explosion chamber include the splint of arc extinguishing bars piece and both sides, the arc extinguishing bars piece include the U type piece of front end and the W type spare of rear end, U type piece opening to the direction that electric arc comes, the W type spare on have even aperture, splint clamp be in U type piece both sides, the bottom surface of W type spare with splint perpendicular, a side of W type spare with the bottom surface laminating of U type piece, white steel cardboard be the U type, a side of white steel cardboard with the lateral surface laminating of W, the arc piece be the U type, a side of arc piece with the lateral surface laminating of white steel cardboard.

Preferably, the number of the U-shaped sheets is multiple, and the U-shaped sheets are arranged at equal intervals.

Preferably, the clamping plate is uniformly provided with small holes.

Preferably, the number of the W-shaped parts is multiple.

Preferably, the W-shaped parts are oppositely and crossly stacked in pairs.

A molded case circuit breaker including the arc extinguishing apparatus of the molded case circuit breaker as claimed in claim.

Compared with the prior art, the invention has the beneficial effects that:

on one hand, the invention solves the problem of forming unacceptable cut-off explosion noise and improves the use environment of the circuit breaker. On the other hand, the cracking of the molded case circuit breaker is reduced, the fatigue damage of parts of the molded case circuit breaker caused by long-term and repeated discharge work is improved, the reliability of the circuit breaker is improved, and the service life is prolonged. In addition, for high-current switching, the air arc in the arcing period of the molded case circuit breaker can be effectively divided, and the arc voltage is increased to realize rapid arc extinction. Meanwhile, the plasma can effectively prevent the dissociative residual arc plasma after the arc is cut off, and the failure of the cut-off caused by the re-breakdown after the arc is avoided.

Drawings

Fig. 1 is a schematic view of an overall structure of a molded case circuit breaker with an arc extinguishing device according to the present invention;

FIG. 2 is a schematic diagram of an arc chute of the present invention;

FIG. 3 is a schematic diagram of the arc chute of the present invention;

FIG. 4 is a schematic structural view of a white steel paperboard of the present invention;

fig. 5 is a schematic structural view of the arc-isolating member of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the field of switching appliances, arcing is an inevitable phenomenon during the breaking of a load or short-circuit current. Arcing is essentially a gas discharge that poses a serious threat to the safety of switching electrical equipment and electrical power systems. The low-voltage molded case circuit breaker is one of switching appliances, and mainly draws air arc into an arc extinguishing grid sheet by means of magnetic contraction force in the current breaking process, the air arc is divided into a plurality of short arcs, and then the fault current is reduced by increasing the voltage of the arc to achieve the arc extinguishing effect.

Specifically, when the molded case circuit breaker is used as an air switch, a high-temperature arc with drastically changing temperature and density is formed when a large current or a short circuit is cut off, and air existing inside is expanded and extruded to the arc extinguishing grid piece and the arc running channel at a high speed, so that shock waves are generated, and a state similar to explosion is formed. This arc impact force, on the one hand, creates unacceptable on-off blast noise, which affects the environment in which the circuit breaker is used. On the other hand, the cracking of the molded case circuit breaker may be caused, or the fatigue damage of the molded case circuit breaker component may be caused after the long-term and repeated discharge work, which affects the reliability of the circuit breaker and shortens the service life.

The impact wave is generated when a large current or a short circuit is cut off, and unacceptable cut-off explosion noise is generated to influence the use environment of the circuit breaker; in addition, the cracking of the molded case circuit breaker is caused, and the fatigue damage of the parts of the molded case circuit breaker is caused after long-term and repeated discharge work, so that the reliability of the circuit breaker is influenced, and the service life is shortened. Meanwhile, for the large current breaking of the molded case circuit breaker, rapid arc extinguishing is difficult to realize, and breaking failure is caused when the molded case circuit breaker is re-struck behind an arc.

Please refer to the drawings

The utility model provides a moulded case circuit breaker's arc control device, includes the explosion chamber 1, white steel cardboard 2 and the arc piece 3 that connect gradually, the explosion chamber include the splint 102 of arc extinguishing bars piece 101 and both sides, arc extinguishing bars piece 101 include the U type piece of front end and the W type spare 4 of rear end, the U type piece opening to the direction that electric arc came, W type spare 4 on have even aperture, splint 102 press from both sides U type piece both sides, the bottom surface of W type spare 4 with splint 102 perpendicular, a side of W type spare with the bottom surface laminating of U type piece, white steel cardboard 2 be the U type, a side of white steel cardboard 2 with the lateral surface laminating of W type spare, arc piece 3 be the U type, a side of arc piece 3 with the lateral surface laminating of white steel cardboard 2.

The length of the clamping plate 102 and the longitudinal length of the integral arrangement of the U-shaped pieces are slightly longer, so that the whole arc extinguish chamber is ensured to be a firm whole, the number and the size of the U-shaped pieces are designed according to the size of the molded case circuit breaker and the required arc extinguish strength, the U-shaped pieces are not limited, the W-shaped piece 4 is a key structure of the arc extinguish chamber 1, arc extinguish and noise reduction can be realized at the tail of the arc extinguish chamber, the number and the size of the W-shaped piece 4 are not limited, the integral material, the size and the number of all parts of the arc extinguish device are not limited, and the arc extinguish device can be designed according to requirements, such as the number, the size, the intervals and the like of the holes on the white steel paperboard 2 are not limited.

Specifically, the number of the U-shaped sheets is multiple, and the U-shaped sheets are arranged at equal intervals.

Specifically, the clamping plate 102 is uniformly provided with small holes. The apertures contribute to noise reduction.

Specifically, the W-shaped members 4 are plural. The quantity of a plurality of W type spares designs as required, if the quantity is less, then the area of W type spare is great, and vibrations are stronger, and the arc extinguishing effect is not good, if too much, then the rigidity can be too strong, also can raise the cost simultaneously.

Specifically, the W-shaped members 4 are stacked in pairs in an opposite crossing manner. The cross lamination can increase the number of arc extinguishing structure layers, thereby enhancing the arc extinguishing effect.

The molded case circuit breaker comprises the arc extinguishing device of the molded case circuit breaker.

The circuit breaker generally comprises contact system, arc extinguishing system, operating device, release, shell etc. and the circuit breaker arc extinguishing structure in this application is applicable to various moulded case circuit breakers, does not do specifically limit here to other structures of circuit breaker.

The working principle is as follows: when the moulded case circuit breaker meets with heavy current or short circuit and cuts off, can form the high temperature electric arc that temperature and density acutely changed, magnetic field force between the sound contact shifts electric arc extremely fast to arc extinguishing bars piece toward explosion chamber 1, cut into several sections little electric arcs through arc extinguishing bars piece, the voltage that increases electric arc extinguishes electric arc, and form to the inside air that exists of the expansion extrusion of runway arc passageway, special construction (W type spare 4) through explosion chamber 1 rear end, 2 white steel cardboard, 3 separate arc spare, block the arc extinguishing with electric arc, and block the reduction with the break explosion noise that will form.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The arc extinguishing device of the molded case circuit breaker is characterized by comprising an arc extinguishing chamber (1), a white steel paperboard (2) and arc isolating pieces (3) which are sequentially connected, wherein the arc extinguishing chamber comprises an arc extinguishing grid piece (101) and clamping plates (102) on two sides, the arc extinguishing grid piece (101) comprises a U-shaped piece at the front end and W-shaped pieces (4) at the rear end, the opening of the U-shaped piece is towards the direction of an electric arc, uniform small holes are formed in the W-shaped pieces (4), the clamping plates (102) are clamped on two sides of the U-shaped piece, the bottom surface of the W-shaped piece (4) is perpendicular to the clamping plates (102), one side surface of the W-shaped piece is attached to the bottom surface of the U-shaped piece, the white steel paperboard (2) is in a U shape, one side surface of the white steel paperboard (2) is attached to the outer side surface of the W-shaped piece, the arc isolating pieces (3) are in a U shape, one side surface of the arc isolating piece (3) is attached to the outer side surface of the white steel paperboard (2).

2. The arc extinguishing apparatus of the molded case circuit breaker according to claim 1, wherein the number of the U-shaped pieces is plural, and the plural U-shaped pieces are arranged at equal intervals.

3. The arc extinguishing apparatus for a molded case circuit breaker according to claim 1, wherein the clamping plate (102) is uniformly provided with small holes.

4. The arc extinguishing apparatus of the molded case circuit breaker according to claim 1, wherein the W-shaped member (4) is plural.

5. The arc extinguishing apparatus of the molded case circuit breaker according to claim 4, wherein the W-shaped members (4) are alternately laminated in pairs.

6. A molded case circuit breaker, characterized in that the molded case circuit breaker includes an arc extinguishing apparatus of the molded case circuit breaker of any one of claims 1 to 5.