CN112885674A - Closed arc extinguish chamber for single-breakpoint molded case circuit breaker and circuit breaker - Google Patents

Abstract

The invention relates to a closed arc extinguish chamber and a circuit breaker for a single-breakpoint molded case circuit breaker, which comprise a shell, an end cover and a plurality of arc extinguish grating pieces, wherein the shell and the end cover are assembled to form a closed cavity, the arc extinguish grating pieces are installed in the cavity, the end cover is provided with an opening for gas outlet when the circuit breaker is disconnected, the side wall inside the shell is provided with a plurality of groups of groove-shaped structures which are parallel to each other, the arc extinguish grating pieces are inserted into the groove-shaped structures, and the end cover and the shell are buckled with each other. Compared with the prior art, the arc extinguish chamber has the advantages that the structure is simple, the assembly process is simple, the arc extinguish chamber structure can be formed only by simple assembly without riveting, the process cost is greatly reduced, arc extinguish grid pieces in different forms can be conveniently replaced according to actual needs, and the maintenance is convenient.

Description

Closed arc extinguish chamber for single-breakpoint molded case circuit breaker and circuit breaker

Technical Field

The invention relates to the technical field of circuit breakers, in particular to a closed arc extinguish chamber for a single-breakpoint molded case circuit breaker and the 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.

The arc chute is a device surrounding the contacts of the switch for limiting the spatial position of the arc and accelerating the arc extinction. At present, the arc extinguish chamber mainly has a closed structure (as shown in fig. 5) and an open structure (as shown in fig. 6), the arc extinguish chamber with the closed structure is commonly used in the molded case circuit breaker with the double-breakpoint structure, and the arc extinguish chamber with the open structure is commonly used in the molded case circuit breaker with the single-breakpoint structure.

At present, aiming at a small-shell-frame molded case circuit breaker with not particularly high breaking performance requirement and compact size, an arc extinguish chamber with a simple form and structure is needed, and the simple assembly process, the convenient assembly and disassembly and the easy replacement are needed to be ensured so as to reduce the process cost.

Patent CN100337290C discloses an arc extinguishing chamber of a low-voltage circuit breaker, comprising an arc extinguishing device composed of a plurality of metal plates similar to "U", the plurality of metal plates are fixed by at least one pair of tie bars located at both sides; the arc-extinguishing device is packaged in a box-shaped shell made of insulating materials, a fixed electrode which can cooperate with the movable electrode is arranged in the shell, and a terminal of the fixed electrode penetrates out of the shell; the shell is also provided with at least one air outlet and an opening through which the movable electrode can pass. The metal plate and the connecting strip are assembled, the assembly structure is complex, and the requirements of simple assembly, convenient assembly and disassembly and easy replacement cannot be met.

Disclosure of Invention

The invention aims to solve the problems and provide a closed arc extinguish chamber for a single-breakpoint molded case circuit breaker, which ensures simple assembly process, convenient disassembly and assembly and easy replacement, and reduces the process cost.

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

the utility model provides a closed explosion chamber for single-breakpoint moulded case circuit breaker, includes casing, end cover and a plurality of arc extinguishing bars piece, the casing forms confined cavity with the end cover equipment, the arc extinguishing bars piece is installed in the cavity, be equipped with the trompil that is used for giving vent to anger when the circuit breaker divides absolutely on the end cover, the inside lateral wall of casing is equipped with the cell type structure that the multiunit is parallel to each other, the arc extinguishing bars piece inserts in the cell type structure, the mutual lock of end cover and casing.

The arc extinguishing chamber of this structure form simple structure, assembly process is simple, only needs simply to assemble, need not the riveting, just can form the arc extinguishing chamber structure, greatly reduced process cost, and the arc extinguishing bars piece of different forms is conveniently changed according to actual need to this structure, is convenient for maintain.

Further, the shell is a rectangular groove body, and the groove structures are arranged on two sides of the inner wall of the shell, so that arc extinguishing grid pieces can be conveniently and stably installed.

Furthermore, the groove-shaped structure is obliquely arranged on the inner wall of the shell, so that arc extinguishing of the moving contact is facilitated.

Further, the groove-shaped structure is formed by a plurality of convex strips arranged on the inner wall of the shell in parallel.

Further, the arc extinguishing grid pieces are U-shaped metal plates.

Further, a notch is arranged in the middle of the U-shaped metal plate, and the bottom end of the notch is conical or trapezoidal.

Furthermore, the bottom of the shell is provided with a long-strip-shaped opening through which the moving contact passes.

Furthermore, the lower part of the end cover is provided with a flange side plate which is matched with the shell for installation, and the end cover is buckled with the end cover through the flange side plate.

Furthermore, the shell and the end cover are assembled to form a rectangular block-shaped arc extinguish chamber structure, the rectangular block-shaped arc extinguish chamber structure is arranged in each phase of the molded case circuit breaker and is positioned in an area between a moving contact and a fixed contact of the circuit breaker, and the moving contact is positioned in the middle of an arc extinguish grid piece of an arc extinguish chamber cavity.

The closed arc extinguish chamber has the specific working principle that when the breaker breaks current, electric arc can be generated and a large amount of gas is generated, the arc extinguish grid piece is used for breaking the electric arc, the large amount of gas generated in the breaking process mainly flows out of the holes in the end cover, and the closed arc extinguish chamber can protect internal parts of the breaker and reduce the impact of the large amount of gas and metal particles generated in the breaking process when large current is broken.

The arc extinguish chamber with the structure has a simple form and structure and a simple assembly process, only needs simple assembly without riveting, greatly reduces the process cost, and can be used in a small-shell-rack molded case circuit breaker with not particularly high breaking performance requirements and compact volume; the structure can be conveniently replaced according to needs, and is very convenient to maintain; the arc extinguishing grid piece of different forms can be installed according to the design needs to this structure, and whole explosion chamber form is nimble changeable removable.

Drawings

FIG. 1 is a schematic diagram of an explosion structure of an arc extinguishing chamber of the present invention;

FIG. 2 is a schematic diagram of an assembled arc extinguishing chamber according to the present invention;

FIG. 3 is a schematic structural diagram of an arc chute according to the present invention;

fig. 4 is a schematic view of the arc chute of the present invention applied to a circuit breaker;

FIG. 5 is a schematic diagram of a prior art open arc chute;

FIG. 6 is a schematic diagram of a prior art closed arc chute;

in the figure: the device comprises a shell 100, a groove-shaped structure 101, a convex strip block 102 and a long strip-shaped opening 103; end cap 200, opening 201, flange edge plate 202; the arc chute 300.

Detailed Description

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

Examples

Referring to fig. 1, a closed arc-extinguishing chamber for a single-breakpoint molded case circuit breaker includes a housing 100, an end cap 200, and a plurality of arc-extinguishing bars 300, the housing 100 and the end cap 200 are assembled to form a closed cavity, the arc-extinguishing bars 300 are installed in the cavity, the end cap 200 is provided with an opening 201 for gas outlet when the circuit breaker is disconnected, a plurality of sets of groove-shaped structures 101 parallel to each other are disposed on a sidewall inside the housing 100, the housing 100 is a rectangular groove, the groove-shaped structures 101 are disposed on two sides of an inner wall of the housing 100, the groove-shaped structures 101 are formed by a plurality of protruding bars 102 arranged in parallel on the inner wall of the housing 100, the groove-shaped structures 101 are obliquely disposed on the inner wall of the housing 100, the arc-extinguishing bars 300 are inserted into the groove-shaped structures 101, a flange side plate 202 installed.

As shown in fig. 3, the arc-extinguishing grid 300 is a U-shaped metal plate, a gap is provided in the middle of the U-shaped metal plate, the bottom end of the gap is tapered, or the gap is trapezoidal, and the bottom of the housing 100 is provided with a long strip-shaped opening 103 for passing through the moving contact.

As shown in fig. 2, the housing 100 and the end cap 200 are assembled to form a rectangular arc-extinguishing chamber structure, as shown in fig. 4, the arc-extinguishing chamber can be installed in each phase of the molded case circuit breaker, and is located between the moving and fixed contacts of the circuit breaker, the narrow slot in the front of the housing can pass through the moving contact bridge of the circuit breaker, and when the arc-extinguishing chamber is assembled in place, the moving contact is located in the arc-extinguishing chamber. The hole of the end cover is used for discharging air when the breaker is in breaking, when the breaker breaks current, electric arc can be generated and a large amount of gas is generated, the arc extinguishing grid piece is used for breaking the electric arc, and the large amount of gas generated in the breaking process mainly flows out of the hole in the end cover. The closed arc extinguish chamber can protect internal parts of the circuit breaker when a large current is cut off, and impact of a large amount of gas and metal particles generated in the cutting process is reduced.

The arc extinguish chamber is simple in form and structure, simple in assembly process, simple to assemble and free of riveting, greatly reduces process cost, can be used in a small-shell rack molded case circuit breaker with breaking performance requirements not particularly high and compact in size, can be conveniently replaced according to needs, is convenient to maintain, and can be provided with arc extinguish grid pieces in different forms according to design needs as shown in figure 3, and the whole arc extinguish chamber is flexible and changeable in form.

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. The utility model provides a closed explosion chamber for single-break moulded case circuit breaker, includes casing (100), end cover (200) and a plurality of arc extinguishing bars piece (300), casing (100) and end cover (200) equipment form the confined cavity, install arc extinguishing bars piece (300) in the cavity, be equipped with trompil (201) that are used for giving vent to anger when the circuit breaker divides on end cover (200), its characterized in that, the inside lateral wall of casing (100) is equipped with the cell type structure (101) that the multiunit is parallel to each other, insert arc extinguishing bars piece (300) in cell type structure (101), end cover (200) and casing (100) lock each other.

2. The closed arc-extinguishing chamber for the single-break molded case circuit breaker according to claim 1, wherein the case (100) is a rectangular groove body, and the groove structure (101) is provided at both sides of the inner wall of the case (100).

3. The closed arc chute for a single break molded case circuit breaker according to claim 2, characterized in that the slot type structure (101) is obliquely disposed on the inner wall of the case (100).

4. The closed arc chute for a single break molded case circuit breaker according to claim 2, characterized in that the slot-like structure (101) is formed by a plurality of cam blocks (102) arranged in parallel on the inner wall of the housing (100).

5. The closed arc chute for a single break molded case circuit breaker according to claim 1, wherein the arc chute pieces (300) are U-shaped metal plates.

6. The closed arc extinguish chamber for the single-breakpoint molded case circuit breaker according to claim 5, wherein a notch is formed in the middle of the U-shaped metal plate, and the bottom end of the notch is tapered or the notch is trapezoidal.

7. The closed arc chute for a single break molded case circuit breaker according to claim 5, characterized in that the bottom of the housing (100) is provided with an elongated opening (103) for passing the moving contact.

8. The closed arc chute for the single break molded case circuit breaker according to claim 1, wherein a lower portion of the end cap (200) is provided with a flange side plate (202) installed to be fitted with the case (100), and the end cap (200) is snap-fitted with the end cap (200) by means of the flange side plate (202).

9. The closed arc-extinguishing chamber for the single-breakpoint molded case circuit breaker according to claim 8, wherein the housing (100) and the end cap (200) are assembled to form a rectangular block-shaped arc-extinguishing chamber structure, and are installed in each phase of the molded case circuit breaker and located in a region between a moving contact and a stationary contact of the circuit breaker, and the moving contact is located in the middle of an arc-extinguishing grid (300) of an arc-extinguishing chamber.

10. A circuit breaker with a closed arc chute as claimed in any one of claims 1-9.

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