CN213635880U

CN213635880U - Arc extinguishing device of low-voltage circuit breaker

Info

Publication number: CN213635880U
Application number: CN202023222924.6U
Authority: CN
Inventors: 管瑞良; 周敏琛; 杨鸣霏
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-07-06
Anticipated expiration: 2030-12-28

Abstract

An arc extinguishing device of a low-voltage circuit breaker belongs to the technical field of low voltage. Including a pair of lateral wall, be located a plurality of arc chute pieces of array between a pair of lateral wall and be located a plurality of the device that disappears of arc chute piece top is freed, the characteristics are: the deionization device comprises an insulating bracket and deionization pieces arranged on the insulating bracket, wherein the deionization pieces are metal wire mesh plates; the insulating support is provided with an accommodating cavity which is communicated up and down and is used for accommodating the deionization pieces, at least two deionization pieces are arranged along the array direction of the arc extinguishing grid pieces, and the deionization pieces are insulated from each other. The advantages are that: the deionization piece has smaller pores, so that arc gas can be fully dissociated, and meanwhile, the deionization pieces which are insulated from each other are adopted, so that short circuit between the deionization pieces is prevented, and short circuit of electric arcs in the deionization layer is prevented.

Description

Arc extinguishing device of low-voltage circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to low-voltage circuit breaker's arc control device.

Background

A low-voltage circuit breaker is a low-voltage electrical appliance for switching on and off a current and providing protection to lines and equipment in case of an overcurrent, and an arc extinguishing device is a very important part of an air circuit breaker, and plays a role in extinguishing an arc and dissociating released gas when a short-circuit current is switched off.

Fig. 1 is an outline of an arc-extinguishing chamber of an air circuit breaker in the prior art, and fig. 2 is an exploded perspective view of the arc-extinguishing chamber shown in fig. 1 in the prior art. The arc extinguishing chamber comprises a pair of side walls 2, an arc extinguishing cover 1 arranged on the upper parts of the side walls 2, and a plurality of flame extinguishing pieces 5, a plurality of arc extinguishing grid pieces 3 and arc guiding pieces 4 arranged in the side walls 2. When the breaker breaks the short-circuit current, the high-temperature and high-pressure metal plasma generated by the electric arc is cut by the arc-extinguishing grid piece 3, the electric arc voltage is rapidly increased, and the electric arc is extinguished favorably. After the electric arc is extinguished, residual free gas enters the arrangement area of the flame extinguishing sheet 5, and is discharged from the vent hole of the arc extinguishing cover 1 after being dissociated by the flame extinguishing sheet 5.

The existing flame-extinguishing sheets 5 cannot achieve better dissociation effect due to larger pores. Meanwhile, if the deionization device arranged on the arc extinguish chamber is an integrated metal body, a short-circuited conductor can be formed, which is not beneficial to arc extinguish of the arc extinguish chamber, so that the technical personnel in the field always seek a method for solving the problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a low-voltage circuit breaker's arc extinguishing device, it disappears and freely has less hole, does benefit to that electric arc gas fully disappears freely, adopts the piece that disappears of mutual insulation simultaneously, prevents to disappear the short circuit between the freely, prevents that electric arc from in the free in situ short circuit that disappears.

The utility model aims at achieving the purpose, the arc extinguishing device of the low-voltage circuit breaker comprises a pair of side walls, a plurality of arc extinguishing grid pieces positioned between the pair of side walls and a deionization device positioned above the arc extinguishing grid pieces, wherein the deionization device comprises an insulating support and deionization pieces arranged on the insulating support, and the deionization pieces are metal wire mesh plates; the insulating support is provided with an accommodating cavity which is communicated up and down and is used for accommodating the deionization pieces, at least two deionization pieces are arranged along the array direction of the arc extinguishing grid pieces, and the deionization pieces are insulated from each other.

In a specific embodiment of the present invention, the deionization unit further comprises a perforated plate, and the perforated plate is located at the bottom of the insulating support.

In another embodiment of the present invention, the deionizing element is a laminated wire mesh sheet.

In another specific embodiment of the present invention, the accommodating cavities are a plurality of accommodating cavities, the plurality of accommodating cavities are arranged along the array direction of the arc-extinguishing grid, and each accommodating cavity accommodates one of the deionizing elements.

In another specific embodiment of the present invention, the accommodating chamber is square.

In yet another specific embodiment of the present invention, the arc extinguishing device further comprises an arc extinguishing cover, the pair of side walls are disposed at a distance, and the arc extinguishing cover is disposed on the top of the arc extinguishing device.

In a more specific embodiment of the present invention, the arc extinguishing device further comprises a flame extinguishing plate assembly located between the deionization device and the plurality of arc extinguishing grids.

In yet another specific embodiment of the present invention, the flame-extinguishing sheet assembly includes a flame-extinguishing sheet support and a plurality of flame-extinguishing sheets, and the plurality of flame-extinguishing sheets are disposed inside the flame-extinguishing sheet support and are in a spaced-apart stacked arrangement.

The utility model adopts the above structure, beneficial effect who has: firstly, because the laminated metal wire mesh plate is adopted as the deionization part, the deionization part has smaller pores, which is beneficial to fully deionizing the arc gas; secondly, the accommodating cavities which are insulated from each other on the insulating support are adopted to accommodate a corresponding number of deionization pieces, so that the insulation among the deionization pieces is ensured, and the short circuit of the electric arc in the deionization layer is effectively prevented; third, the wire mesh sheet is cheap, easy to purchase, and low in manufacturing cost.

Drawings

Fig. 1 is a schematic view of an arc extinguishing chamber of a conventional circuit breaker.

Fig. 2 is an exploded perspective view of an arc extinguishing chamber of a conventional circuit breaker.

Fig. 3 is an exploded view of the arc extinguishing device according to the present invention.

Fig. 4 is a schematic structural diagram of the first step of the folding process of the wire mesh plate of the present invention.

Fig. 5 is a schematic structural diagram of the second step of the folding process of the wire mesh plate of the present invention.

Fig. 6 is a schematic structural diagram of the third step in the folding process of the metal wire mesh plate of the present invention.

Fig. 7 is a schematic structural view of the bracket of the present invention.

Fig. 8 is a schematic structural diagram of the deionization device of the present invention.

In the figure: 1. arc extinguishing cover, 11, vent hole; 2. a side wall; 3. arc extinguishing grid pieces; 4. an arc guide sheet; 5. a flame-extinguishing sheet; 6. the flame-out piece assembly comprises 61 flame-out piece brackets and 62 flame-out pieces; 7. the device comprises a deionization device, 71, an insulating bracket, 711, an accommodating cavity, 72, a deionization part and 73, an orifice plate.

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, any concept relating to the directions or orientations of up, down, left, right, front, and rear is based on the position shown in the corresponding drawings, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

The utility model relates to an arc control device of low-voltage circuit breaker. The arc extinguishing device (arc extinguishing chamber for short) is an important component of the circuit breaker and is used for extinguishing electric arcs generated on a contact system of the circuit breaker. When the circuit breaker is connected to a circuit, if fault current is generated, the arc extinguishing chamber extinguishes electric arc, so that the circuit is blocked, and a subordinate load is protected.

Referring to fig. 3, the arc chute includes an arc chute cover 1, a pair of sidewalls 2, a plurality of arc chute plates 3, a flame plate assembly 6, and a deionization apparatus 7. The pair of side walls 2 are located on both sides of the arc extinguishing chamber. The pair of side walls 2 are spaced apart. And the arc extinguishing cover 1 is positioned at the top of the arc extinguishing chamber. The arc extinguishing cover 1 is fixedly connected with the pair of side walls 2 to form the appearance shape of the arc extinguishing chamber.

The arc extinguishing cover 1 is made of insulating materials, a vent hole 11 is formed in the arc extinguishing cover, and the vent hole 11 is used for exhausting gas in an arc extinguishing chamber. The side walls 2 are made of an insulating material, and the space between a pair of side walls 2 is used for installing the arc chute 3, the flame-extinguishing sheet assembly 6 and the deionization device 7. The number of the arc extinguishing grid pieces 3 is multiple and is arranged in an array. The arrays are arranged in spaced array arrangement. Preferably, the arrangement is at equal intervals. The arc extinguishing grid pieces 3 are made of metal materials, and the array direction of the arc extinguishing grid pieces is along the front-back direction of the arc extinguishing chamber, namely perpendicular to the opposite direction of the pair of side walls 2.

The flame-extinguishing sheet assembly 6 is positioned above the arrayed arc-extinguishing grid plates 3, namely, between the deionization device 7 and a plurality of arc-extinguishing grid plates 3. The flame-extinguishing sheet assembly 6 comprises a flame-extinguishing sheet support 61 and a plurality of flame-extinguishing sheets 62, the flame-extinguishing sheet support 61 is preferably a square frame, and the plurality of flame-extinguishing sheets 62 are arranged inside the flame-extinguishing sheet support 61. The flame-extinguishing sheet support 61 is made of an insulating material. And the flame-extinguishing sheet 62 is a perforated plate. The plurality of flame extinguishing plates 62 are stacked up and down at intervals.

Please refer to fig. 3, the innovation of the present invention is: and a deionization device 7. The deionization device 7 is used for deionizing the arc gas. The deionization apparatus 7 comprises an insulating support 71 and a deionization member 72 mounted on the insulating support 71. The deionization part 72 is a wire mesh plate. Because the wire mesh plate is used as the dissociation eliminating piece, the pores of the wire mesh are very small, and the arc gas can be fully dissociated. And the metal wire mesh plate has low cost, so that the manufacturing cost of the arc extinguish chamber is reduced.

For the thickness of the deionised piece 72 of wire mesh sheet to meet the designer's requirements, the wire mesh sheet can be folded in a folding fashion.

Referring to fig. 4, 5 and 6, a process for folding the wire mesh sheet is shown. The metal wire mesh plate is in a strip shape, the two ends of the metal wire mesh plate are firstly folded towards the middle to form a double-layer metal wire mesh plate, and then the double-layer metal wire mesh plate is folded in half to form a four-layer metal wire mesh plate. By adopting the folding mode, the two ends of the strip-shaped metal wire mesh plate are folded in the middle of the four layers of metal wire mesh plates, so that the two ends are not easy to scatter, and the shape stability after folding can be kept.

Referring to fig. 7 and 8, the insulating support 71 is provided with at least two accommodating cavities 711 which are communicated up and down, and the accommodating cavities 711 are insulated from each other because the insulating support 71 is made of insulating material. The receiving cavity 711 is used for receiving a corresponding number of the deionizing elements 72. I.e. each stacked wire mesh sheet is placed in one of said receiving cavities 711. The accommodating cavities 711 are multiple, the accommodating cavities 711 are arranged along the direction of the multiple arc extinguishing grid pieces 3 in an array, and each accommodating cavity 711 is used for accommodating one deionization piece 72.

Preferably, in order to allow the deionizing element 72 to be placed in the containing cavity 711 without sinking. The deionization device 7 also comprises an orifice plate 73, and the orifice plate 73 is positioned at the bottom of the insulating bracket 71. Not only can the deionization piece 72 not sink, but also the arc gas can pass through the deionization device 7 conveniently.

Preferably, the receiving cavity 711 has a square shape. More preferably, the receiving cavities 711 are five for receiving five separate deionizing elements 72, i.e., five stacked expanded metal sheets.

The utility model discloses owing to adopted range upon range of wire mesh board as disappearing piece 72 for wire mesh board's aperture can exert, has improved the disappearing ability of explosion chamber, simultaneously, wire mesh board cheap, easy purchase. More importantly, the accommodating cavities 711 in the insulating support 71, which are insulated from each other, are used for accommodating a corresponding number of deionizing elements 72, so that the insulation between the deionizing elements 72 is ensured, the short circuit between the deionizing elements 72 is prevented, and the short circuit of the electric arc in the deionizing layers is prevented.

Claims

1. An arc extinguishing device of a low-voltage circuit breaker, comprising a pair of side walls (2), a plurality of arc-extinguishing grids (3) of the array located between a pair of side walls (2) and a deionization device (7) located a plurality of above the arc-extinguishing grids (3), characterized in that: the deionization device (7) comprises an insulating bracket (71) and an deionization part (72) arranged on the insulating bracket (71), wherein the deionization part (72) is a wire mesh plate; the insulating support (71) is provided with an accommodating cavity (711) which is communicated up and down and is used for accommodating the deionization pieces (72), at least two deionization pieces (72) are arranged along the array direction of the arc extinguishing grid pieces (3), and the deionization pieces (72) are mutually insulated.

2. An arc extinguishing device for low-voltage circuit breakers according to claim 1, characterized in that said deionization means (7) also comprise a perforated plate (73), said perforated plate (73) being positioned at the bottom of said insulating support (71).

3. An arc extinguishing device for low-voltage circuit breakers according to claim 1, characterized in that said deionizing element (72) is a laminated sheet of expanded metal.

4. An arc extinguishing device for low-voltage circuit breakers according to claim 1, characterized in that said housing (711) is a plurality of housings (711), a plurality of housings (711) being arranged along the array of said arc-extinguishing grids (3), each housing (711) housing one of said extinguishing members (72).

5. An arc extinguishing device for low-voltage circuit breakers according to claim 4, characterized in that said housing chamber (711) is square.

6. An arc extinguishing device for low-voltage circuit breakers according to claim 1, characterized in that it further comprises an arc extinguishing cover (1), said pair of side walls (2) being spaced apart, said arc extinguishing cover (1) being located at the top of the arc extinguishing device.

7. An arc extinguishing device for low-voltage circuit breakers according to claim 1, characterized in that it further comprises a flame quenching sheet assembly (6), the flame quenching sheet assembly (6) being located between said deionization means (7) and a plurality of said arc chute plates (3).

8. An arc extinguishing device for low-voltage circuit breakers according to claim 7, characterized in that said extinguishing plate assembly (6) comprises a extinguishing plate holder (61) and a plurality of extinguishing plates (62), said extinguishing plates (62) being arranged inside said extinguishing plate holder (61) in a spaced-apart stacked arrangement.