CN113936980A - Arc extinguish chamber of circuit breaker - Google Patents

Abstract

The invention relates to an arc chute of a circuit breaker, comprising: the two arc isolating walls are arranged at intervals, and a plurality of slideways are arranged on the inner side edges of the arc isolating walls; the arc extinguishing grid pieces are embedded into the slide ways of the two arc isolating walls; the arc-extinguishing grid pieces and the two arc-isolating walls are combined to form an arc-extinguishing chamber, and the arc-isolating walls are provided with magnetic conduction plates at one end of the opening of the arc-extinguishing chamber. This explosion chamber is through being equipped with the magnetic conduction board on the flash barrier, carries out the striking to the electric arc that produces to make electric arc can get into in the explosion chamber sooner, electric arc is introduced the arc extinguishing bars piece of the top after, and the even cutting electric arc of arc extinguishing bars piece, a long electric arc is cut apart into the short electric arc of multistage, reaches best arc extinguishing effect, guarantees to extinguish arc rapidly.

Description

Arc extinguish chamber of circuit breaker

Technical Field

The invention relates to the field of low-voltage electrical appliances, in particular to an arc extinguish chamber of a circuit breaker.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition for a predetermined time. The circuit breaker can be used for distributing electric energy, starting an asynchronous motor infrequently, protecting a power supply circuit, a motor and the like, automatically cutting off a circuit when faults such as serious overload, short circuit, undervoltage and the like occur, has the function equivalent to the combination of a fuse type switch, an over-under-heat relay and the like, and generally does not need to change parts after breaking fault current.

In the breaking process of the circuit breaker, the voltage between the contacts causes air dielectric discharge to form electric arcs, so that in a circuit breaker switch, an arc extinguishing chamber is usually used for arc extinguishing so as to ensure the safe operation of an electric appliance. However, the arc striking effect of the existing arc extinguishing chamber is not good, so that the electric arc cannot enter the arc extinguishing chamber structure more quickly, and the better arc extinguishing effect cannot be achieved.

Patent CN107863282B discloses an explosion chamber of circuit breaker, including the relative arc wall that sets up, insulation board and the arc extinguishing bars piece of connecting the arc wall, the arc extinguishing intracavity that the arc wall formed with the insulation board sets up the arc extinguishing bars piece, the explosion chamber of circuit breaker still is provided with the arc extinguishing chamber, form a magnetic field between the arc wall, the arc extinguishing chamber is including setting up the horizontal board above the arc extinguishing chamber and the vertical board of laminating with the arc wall, horizontal board forward position middle part is provided with the boss of protruding arc extinguishing chamber, a recess has been seted up in the boss, be provided with the magnet steel in the recess, vertical board forms first horizontal face and second horizontal face, the part between first horizontal face and the second horizontal face forms the stabilizer blade, however this invention explosion chamber structure still is more complicated, and can't reach the striking effect.

Disclosure of Invention

The invention aims to solve the problems and provide an arc extinguishing chamber of a circuit breaker, and the arc extinguishing chamber structure can introduce electric arcs to arc extinguishing grid pieces through structural design, so that arc extinguishing is conveniently and effectively carried out, and a better arc extinguishing effect is achieved.

The purpose of the invention is realized by the following technical scheme:

an arc chute of a circuit breaker comprising:

the two arc isolating walls are arranged at intervals, and a plurality of slideways are arranged on the inner side edges of the arc isolating walls; and

the arc extinguishing grid pieces are embedded into the slide ways of the two arc isolating walls;

the arc-extinguishing grid pieces and the two arc-isolating walls are combined to form an arc-extinguishing chamber, and the arc-isolating walls are provided with magnetic conduction plates at one end of the opening of the arc-extinguishing chamber.

In the breaking process of the circuit breaker, the voltage between the contacts causes air dielectric discharge to form electric arcs, and the arc extinguishing chamber is used for extinguishing arcs so as to ensure the safe operation of electric appliances. This explosion chamber has the effect of electromagnetic force through being equipped with the magnetic conduction board on the flash barrier, to electric arc to make electric arc can get into in the explosion chamber sooner, after electric arc was introduced the arc extinguishing bars piece of the top, the even cutting electric arc of arc extinguishing bars piece, a long electric arc is cut apart into the short electric arc of multistage, reaches best arc extinguishing effect, guarantees to extinguish the arc rapidly.

Preferably, the magnetic conductive plate is arranged on the arc-isolating wall at a side edge opposite to the insertion end of the arc-extinguishing grid piece.

Preferably, the arc wall is provided with a groove, and the magnetic conduction plate is embedded in the groove.

Preferably, the slide is the multiunit and is parallel to each other the groove type structure of flash barrier inner wall, the parallel insertion of arc extinguishing bars piece interval in proper order in the slide.

Preferably, the inner wall of the arc-isolating wall is provided with an open U-shaped slideway along the upper part of the insertion end of the arc-extinguishing grid plate, and the lower part of the arc-extinguishing grid plate is provided with a mounting cavity.

Preferably, the magnetic conductive plate is a strip-shaped rectangular plate, and the length direction of the magnetic conductive plate is parallel to the arrangement direction of the arc extinguishing grid pieces.

Preferably, the length of the magnetic conduction plate is consistent with the arrangement width of the arc extinguishing grid pieces.

Preferably, the arc extinguishing bars are metal sheets provided with U-shaped arc extinguishing grooves, the U-shaped arc extinguishing grooves are formed by connecting multiple sections of arc lines, and an invaginated notch is formed in the middle of each U-shaped arc extinguishing groove.

Preferably, the side wall of the arc-isolating wall is provided with an air outlet, so that hot air generated during arc extinction can be cooled and diffused in time.

Preferably, the arc extinguishing chamber is installed in the circuit breaker and is located in the area between the moving contact and the fixed contact of the circuit breaker, and the moving contact is located in the middle of the arc extinguishing grid piece of the arc extinguishing chamber.

According to the invention, the magnetic conduction plate is arranged at the bottom of the arc-isolating wall of the arc-extinguishing chamber, electric arcs rapidly enter the arc-extinguishing grid pieces under the action of electromagnetic force, after the electric arcs are introduced into the uppermost arc-extinguishing grid pieces, the arc-extinguishing grid pieces uniformly cut the electric arcs, one long arc is divided into a plurality of sections of short arcs, so that the optimal arc-extinguishing effect is achieved, the air outlets are arranged on the two sides of the arc-isolating wall, so that hot air generated during arc extinguishing can be timely cooled and dispersed, arc extinguishing is convenient and effective, and a better arc-extinguishing effect is achieved.

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

(1) the arc-isolating wall bottom is equipped with the magnetic conduction board, has not only shortened the length of arc extinguishing bars piece, and reduce cost makes simple structure, makes electric arc can get into the explosion chamber more fast under the electromagnetic force effect, and after electric arc was introduced into the arc extinguishing bars piece, the even cutting electric arc of arc extinguishing bars piece, a long electric arc was cut apart into the short electric arc of multistage, reaches best arc extinguishing effect, guarantees to extinguish the arc rapidly.

(2) The arc-extinguishing grid piece is installed on the arc-isolating wall, the sliding grooves are formed in the edges of the sliding grooves and the arc-extinguishing grid pieces, the installation and the disassembly are very convenient, the assembly mode is simple, the maintenance is very convenient, the arc-extinguishing grid pieces in different forms can be installed on the structure according to design requirements, and the whole arc-extinguishing chamber is flexible and changeable.

(3) The side wall of the arc-isolating wall is provided with the air outlet, so that hot air flow generated during arc extinguishing can be timely cooled and diffused, and high-temperature and high-pressure air flow can enter the pneumatic tripping device through the air outlet, so that the breaking speed of the circuit breaker is further increased.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an arc extinguishing chamber;

FIG. 2 is a schematic structural view of the flash barrier;

FIG. 3 is a schematic side view of the arc wall;

FIG. 4 is a schematic structural diagram of an arc chute;

in the figure:

1-arc extinguishing grid sheet; 11-U-shaped arc extinguishing grooves;

2-an arc wall; 21-air outlet; 22-a groove; 23-a slide;

3-magnetic conductive plate.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Referring to fig. 1, an arc chute of a circuit breaker includes two arc chutes 2 and a plurality of arc chute pieces 1. Two arc walls 2 are arranged alternately, as shown in fig. 2, a plurality of slideways 23 are arranged on the inner side edges of the arc walls 2, the slideways 23 are of a plurality of groups of groove-shaped structures which are arranged in parallel on the inner wall of the arc walls 2, and the arc-extinguishing grid pieces 1 are sequentially inserted into the slideways 23 at intervals in parallel. The upper part of the inner wall of the arc-isolating wall 2 along the insertion end of the arc-extinguishing grid sheet 1 is an open U-shaped slideway 23, and the lower part is a mounting cavity.

Referring to fig. 4, the arc chute plate 1 is a metal plate provided with a U-shaped arc chute 11, the U-shaped arc chute 11 is formed by connecting a plurality of arc lines, and an invaginated notch is formed in the middle of the U-shaped arc chute 11. The arc extinguishing grid sheet 1 and the two arc isolating walls 2 are combined to form an arc extinguishing chamber, and the arc isolating walls 2 are provided with magnetic conduction plates 3 at the open ends of the arc extinguishing chamber. The magnetic conduction plate 3 is arranged on the side edge of the arc-isolating wall 2 opposite to the insertion end of the arc-extinguishing grid sheet 1.

As shown in fig. 3, the arc-isolating wall 2 is provided with a groove 22, the magnetic conductive plate 3 is embedded in the groove 22, the magnetic conductive plate 3 is a strip-shaped rectangular plate, the length direction of the strip-shaped rectangular plate is parallel to the arrangement direction of the arc-extinguishing grid pieces 1, and the length of the magnetic conductive plate 3 is consistent with the arrangement width of the arc-extinguishing grid pieces 1.

In addition, the side wall of the arc-isolating wall 2 is provided with an air outlet 21, so that hot air generated during arc extinction can be cooled and diffused in time.

The arc extinguishing chamber is arranged in the circuit breaker and is positioned in the area between the moving contact and the fixed contact of the circuit breaker, and the moving contact is positioned in the middle of the arc extinguishing grid piece 1 of the arc extinguishing chamber. In the breaking process of the circuit breaker, the voltage between the contacts causes air dielectric discharge to form electric arcs, and the arc extinguishing chamber is used for extinguishing arcs so as to ensure the safe operation of electric appliances. This explosion chamber is through being equipped with magnetic conduction plate 3 on arc wall 2, there is the effect of electromagnetic force to electric arc, make electric arc can get into in the explosion chamber sooner, electric arc is introduced into the arc extinguishing bars piece 1 back of the top, arc extinguishing bars piece 1 evenly cuts electric arc, a long electric arc is cut apart into the short electric arc of multistage, reach best arc extinguishing effect, be equipped with gas outlet 21 on the lateral wall of arc wall, guarantee that the hot gas flow that produces can in time cool off and disperse when the arc extinguishing, and gas outlet 21 can blow the system cooperation with the magnetism of circuit breaker, strengthen the magnetic blow effect greatly.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (10)

1. An arc chute for a circuit breaker, comprising:

the two arc isolating walls (2) are arranged at intervals, and a plurality of slideways (23) are arranged on the inner side edges of the arc isolating walls (2); and

the arc extinguishing grid pieces (1) are embedded into the slide ways (23) of the two arc isolating walls (2);

a plurality of arc extinguishing bars piece (1) with two arc wall (2) make up and form arc extinguishing chamber, arc wall (2) set up magnetic conduction board (3) in the uncovered one end of arc extinguishing chamber.

2. Arc chute of a circuit breaker according to claim 1, characterized in that said magnetically conductive plate (3) is arranged on the side of said arc-chute wall (2) opposite to the insertion end of said arc chute (1).

3. Arc chute of a circuit breaker according to claim 2, characterized in that said arc-isolating wall (2) is provided with a groove (22), said magnetic conducting plate (3) being embedded in said groove (22).

4. The arc extinguish chamber of the circuit breaker as claimed in claim 1, wherein the slide (23) is a plurality of sets of groove-shaped structures which are arranged in parallel on the inner wall of the arc isolating wall (2), and the arc extinguishing bars (1) are inserted into the slide (23) at intervals in parallel in sequence.

5. The arc extinguish chamber of the circuit breaker according to claim 4, wherein the inner wall of the arc isolating wall (2) is provided with an open U-shaped slideway (23) at the upper part along the insertion end of the arc extinguishing grid piece (1) and a mounting cavity at the lower part.

6. The arc extinguish chamber of the circuit breaker according to claim 4, wherein the magnetic conducting plate (3) is a strip-shaped rectangular plate, and the length direction of the magnetic conducting plate is parallel to the arrangement direction of the arc extinguish grid pieces (1).

7. Arc chute of a circuit breaker according to claim 6, characterized in that the length of said magnetically conductive plate (3) corresponds to the width of the arrangement of said arc chute (1).

8. The arc extinguish chamber of the circuit breaker according to claim 1, wherein the arc extinguish grid sheet (1) is a metal sheet provided with a U-shaped arc extinguish groove (11), the U-shaped arc extinguish groove (11) is formed by connecting a plurality of arc lines, and an inwards concave notch is formed in the middle of the U-shaped arc extinguish groove (11).

9. Arc chute of a circuit breaker according to any of claims 1-8, characterized in that the side walls of the arc-chute wall (2) are provided with gas outlets (21).

10. Arc chute of a circuit breaker according to claim 9, characterized in that it is incorporated in the circuit breaker in the area between the moving and stationary contacts of the circuit breaker, the moving contact being located in the middle of the arc chute (1) of the arc chute.

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