CN218447777U

CN218447777U - Arc extinguishing structure applied to circuit breaker

Info

Publication number: CN218447777U
Application number: CN202221939066.3U
Authority: CN
Inventors: 丁国辉; 师建轩; 周建勇; 汪浪; 刘乐斌
Original assignee: Zhejiang Minghui Intelligent Electric Co ltd
Current assignee: Zhejiang Minghui Intelligent Electric Co ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2023-02-03
Anticipated expiration: 2032-07-26

Abstract

The utility model discloses a be applied to arc extinguishing structure of circuit breaker, include: the moving contact, the static contact and the arc extinguishing component; the static contact is positioned at one end of the arc extinguishing component; the moving contact moves between a conducting state of contacting the fixed contact and a disconnecting state of separating from the fixed contact; the arc extinguishing subassembly includes: two arc-isolating walls; a plurality of arc extinguishing grid pieces for lengthening and cutting off the electric arc are arranged between the two arc isolating walls; a plurality of arc extinguishing grid pieces are arranged between the two arc isolating walls at intervals along a straight line; the arc extinguishing component is detachably provided with a protective cover used for preventing high-temperature and high-pressure airflow in the arc extinguishing component from flowing outwards on one side of the arc isolating wall facing the moving contact; the protective cover is provided with a moving guide groove for the moving contact to move; the groove wall of the movable guide groove is provided with a shielding part for preventing high-temperature and high-pressure gas between two adjacent arc extinguishing grid pieces from flowing outside. Be applied to arc extinguishing structure of circuit breaker and can carry out high-efficient arc extinguishing to can protect the components and parts of circuit breaker rear end.

Description

Arc extinguishing structure applied to circuit breaker

Technical Field

The utility model relates to a technical field of circuit breaker arc extinguishing, concretely relates to be applied to arc extinguishing structure of circuit breaker.

Background

Generally, the circuit breaker is provided with an arc extinguishing system, arcs in the short-circuit breaking process are extinguished through the arc extinguishing system, and the temperature around the movable contact and the static contact can be cooled. The existing arc extinguishing system has the following defects: 1. the electric arc can not quickly and effectively enter an arc extinguish chamber of an arc extinguish system, so that the situation that the contact is seriously burnt and damaged due to the overlong dead time of the electric arc on the surface of the contact is caused; 2. the arc is usually sprayed to the rear end, so that the burning loss of components at the rear end of the circuit breaker is serious, the circuit breaker is broken and fails, and a line and a load unit cannot be effectively protected.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The arc extinguishing chamber that can not quick effectual entering arc extinguishing system to the electric arc of above current circuit breaker leads to electric arc to appear the serious condition of contact scaling loss at contact surface dead time overlength to and electric arc can spray to the rear end usually, and the components and parts that lead to the circuit breaker rear end are scaling loss serious, thereby lead to the circuit breaker to divide and break apart the inefficacy, can not effectively protect the problem of circuit and load cell, and this application provides an arc extinguishing structure who is applied to the circuit breaker.

2. Technical scheme

In order to solve the above problem, the utility model provides a technical scheme does:

an arc extinguishing structure applied to a circuit breaker, comprising: the moving contact, the static contact and the arc extinguishing assembly; the static contact is positioned at one end of the arc extinguishing assembly; the moving contact moves between a conducting state of contacting the static contact and a disconnecting state of separating from the static contact; the arc extinguishing assembly includes: two arc-isolating walls; a plurality of arc extinguishing grid pieces for lengthening and cutting off the electric arc are arranged between the two arc isolating walls; a plurality of arc extinguishing grid pieces are arranged between the two arc isolating walls at intervals along a straight line; the arc extinguishing component is detachably provided with a protective cover used for preventing high-temperature and high-pressure airflow in the arc extinguishing component from flowing outwards on one side of the arc isolating wall facing the moving contact; the protective cover is provided with a moving guide groove for the moving contact to move; the groove wall of the movable guide groove is provided with a shielding part for preventing high-temperature and high-pressure gas between two adjacent arc extinguishing grid pieces from flowing outside.

Further, the protection casing passes through the cooperation structure demountable installation of buckle and draw-in groove in the flash barrier wall.

Furthermore, the two arc separating walls are provided with buckles; the protective cover is provided with a clamping groove; the protective cover is clamped into the clamping groove through a buckle and detachably arranged on the arc wall.

Further, the protective cover is formed with a plurality of clamping grooves; a plurality of arc extinguishing grid pieces are provided with buckles; the protective cover is clamped into the clamping groove through a buckle and is detachably arranged between the two arc isolating walls.

Further, the shielding part is provided with an arc-cutting groove for enabling the free arc carried by the movable contact to enter the arc extinguishing component.

Furthermore, the groove wall of the arc-cutting groove is a guide inclined surface capable of guiding the free electric arc into the arc-extinguishing component.

Furthermore, one end of the moving guide groove far away from the fixed contact is provided with a blocking part for limiting the movement of the movable contact.

Further, the stopper is made of an elastic material.

Furthermore, an installation groove for clamping and installing a static contact is formed at the end part of the protective cover; the mounting structure of static contact laminates the cell wall of mounting groove.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

the utility model provides a be applied to arc extinguishing structure of circuit breaker is through setting up the protection casing, when sound contact open circuit, the electric arc and the high temperature high-pressure gas that form the air current under the slot effect of the removal guide slot of protection casing, this air current blows the electric arc to the direction of keeping away from the contact, at this moment, electric arc quick travel gets into the interval between the arc extinguishing bars piece of arc extinguishing subassembly rapidly, cut apart and lengthen and extinguish under the effect of arc extinguishing bars piece fast, high-efficient completion arc extinguishing operation. Through such structure, can extinguish electric arc fast, reduce the temperature around the sound contact, avoid electric arc to appear the serious condition of contact scaling loss at sound contact surface dead time overlength, simultaneously, the protection casing can also prevent electric arc to spray to the circuit breaker rear end to avoid the components and parts scaling loss of circuit breaker rear end serious, guarantee that the circuit breaker operation is stable.

Drawings

Fig. 1 is a schematic diagram of an arc extinguishing structure applied to a circuit breaker according to an embodiment of the present invention;

fig. 2 is a schematic diagram of another embodiment of an arc extinguishing structure applied to a circuit breaker according to an embodiment of the present invention;

the arc extinguishing structure 10 applied to the circuit breaker, the movable contact 11, the fixed contact 12, the arc extinguishing component 13, the arc barrier 131, the arc extinguishing grid 132, the protective cover (133, 133a), the moving guide groove 1331, the shielding part 1332, the blocking part 1333, the mounting groove 1334, the buckle (13, 13a), the clamping groove (14, 14a), the arc intercepting groove 15a and the guide inclined plane 16a.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The utility model discloses in words such as first, second, be for the description the utility model discloses a technical scheme is convenient and set up, and does not have specific limiting action, is general finger, right the technical scheme of the utility model does not constitute limiting action. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. A plurality of technical schemes in the same embodiment and a plurality of technical schemes in different embodiments can be arranged and combined to form a new technical scheme without contradiction or conflict, which is all in the scope of the utility model.

Example 1

As shown in fig. 1, an arc extinguishing structure 10 applied to a circuit breaker includes: a moving contact 11, a fixed contact 12 and an arc extinguishing component 13. The fixed contact 12 is located at one end of the arc extinguishing assembly 13, and the movable contact 11 moves between a conducting state contacting the fixed contact 12 and a disconnecting state separating from the fixed contact 12, so that circuit breaking operation is realized. Specifically, the arc extinguishing assembly 13 includes: the arc extinguishing bars 132 are arranged between the two arc isolating walls 131, and are used for lengthening and isolating electric arcs, and the arc extinguishing bars 132 are arranged between the two arc isolating walls 131 at intervals along a straight line, so that the arc extinguishing is realized by breaking. The arc-extinguishing component 13 is detachably provided with a protective cover 133 on one side of the arc-isolating wall 131 facing the movable contact 11, and the protective cover 133 is used for preventing high-temperature and high-pressure airflow in the arc-extinguishing component 13 from flowing outwards. Meanwhile, the protective cover 133 is formed with a moving guide groove 1331, the moving guide groove 1331 is used for moving the moving contact 11 between a conducting state and a disconnecting state, the moving guide groove 1331 is located at the opening of the arc extinguishing component 13 and is long and narrow, thus when the moving contact 12 and the fixed contact 12 are separated to form electric arc and high-temperature high-pressure gas, due to the long and thin moving guide groove 1331, air flow can be formed, the air flow drives the electric arc and the high-temperature high-pressure gas to rapidly move in the arc extinguishing chamber, thereby accelerating the electric arc breaking and cooling the periphery of the moving contact 12, meanwhile, the protective cover 133 can prevent the electric arc and the high-temperature high-pressure gas from flowing to the rear end of the circuit breaker, and thus avoiding burning components and parts at the rear end of the circuit breaker. The groove wall of the moving guide groove 1331 is formed with a shielding portion 1332, and the shielding portion 1332 is used for preventing high-temperature and high-pressure gas between two adjacent arc-extinguishing grids 132 from flowing outside, so as to further protect components at the rear end of the circuit breaker.

The arc extinguishing structure 10 applied to the circuit breaker is provided with the protective cover 133, when the movable and static contacts 12 break a circuit, formed electric arcs and high-temperature and high-pressure gas form airflow under the action of the narrow slits of the moving guide grooves 1331 of the protective cover 133, the airflow blows the electric arcs to the direction far away from the contacts, at the moment, the electric arcs move rapidly and enter the intervals between the arc extinguishing bars 132 of the arc extinguishing component 13 rapidly, the arc extinguishing is rapidly extinguished under the division and elongation actions of the arc extinguishing bars 132, and the arc extinguishing operation is efficiently completed. Through such structure, can extinguish electric arc fast, reduce the temperature around the sound contact 12, avoid electric arc to appear the serious condition of contact scaling loss at the 12 surperficial dead time overlengths of sound contact, simultaneously, protection casing 133 can also prevent electric arc to spray to the circuit breaker rear end to avoid the components and parts scaling loss of circuit breaker rear end serious, guarantee that the circuit breaker operation is stable.

In a specific embodiment, the protective cover 133 is detachably mounted on the arc-isolating wall 131 through the matching structure of the buckle 13 and the clamping groove 14. In this embodiment, two arc separating walls 131 are formed with buckles 13, and protection casing 133 is formed with draw-in groove 14, and protection casing 133 passes through buckle 13 and goes into demountable installation in draw-in groove 14 in the flash separating wall 131, and mounting structure is simple, easy dismantlement.

Further, a blocking portion 1333 is formed at one end of the moving guide slot 1331 away from the stationary contact 12. The stop 1333 can limit the movement of the movable contact 11. The stop portion 1333 is made of an elastic material, so as to protect the movable contact 11 to a certain extent.

As a specific embodiment, the end of the shield 133 is formed with a mounting groove 1334. The mounting groove 1334 is used for clamping and mounting the static contact 12, and the mounting structure of the static contact 12 is attached to the groove wall of the mounting groove 1334, so that electric arcs and high-temperature and high-pressure gas can be further prevented from escaping from the gap.

The present embodiment also provides another embodiment, as shown in fig. 2, which is different from the arc extinguishing structure 10 applied to the circuit breaker in the above embodiment in that: the protective cover 133a is formed with a plurality of clamping grooves 14a, a plurality of the arc-extinguishing bars are formed with buckles 13a, and the protective cover 133a is clamped into the clamping grooves 14a through the buckles 13a and detachably mounted between the two arc-isolating walls. An arc-cutting groove 15a is formed at the shielding part of the protective cover 133a, and the arc-cutting groove 15a is used for enabling free arcs carried by the movable contact to enter the arc extinguishing assembly, so that the effectiveness and the efficiency of arc extinguishing can be further improved. In addition, the groove wall of the arc-extinguishing groove 15a is a guide inclined surface 16a, so that the free arc can be guided into the arc-extinguishing component, and the structural reliability is higher.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art should understand that without departing from the spirit of the present invention, the person skilled in the art should not inventively design the similar structural modes and embodiments to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. An arc extinguishing structure applied to a circuit breaker, comprising: the moving contact, the static contact and the arc extinguishing component; the static contact is positioned at one end of the arc extinguishing assembly; the moving contact moves between a conducting state of contacting the static contact and a disconnecting state of separating from the static contact; characterized in that, the arc extinguishing subassembly includes: two arc-isolating walls; a plurality of arc extinguishing grid pieces for lengthening and cutting off the electric arc are arranged between the two arc isolating walls; the arc extinguishing grid pieces are arranged between the two arc isolating walls at intervals along a straight line; the arc extinguishing component is detachably provided with a protective cover used for preventing high-temperature and high-pressure airflow in the arc extinguishing component from flowing outwards on one side of the arc isolating wall facing the moving contact; the protective cover is provided with a moving guide groove for the moving contact to move; and a blocking part for preventing high-temperature and high-pressure gas between two adjacent arc extinguishing bars from flowing outside is formed on the groove wall of the movable guide groove.

2. The arc extinguishing structure applied to the circuit breaker according to claim 1,

the protective cover is detachably mounted on the arc-isolating wall through a matching structure of the buckle and the clamping groove.

3. The arc extinguishing structure applied to the circuit breaker according to claim 2,

the two arc isolating walls are provided with the buckles; the protective cover is provided with the clamping groove; the protective cover is clamped into the clamping groove through the buckle and is detachably mounted on the arc-isolating wall.

4. The arc extinguishing structure applied to the circuit breaker according to claim 2,

the protective cover is provided with a plurality of clamping grooves; the buckles are formed on a plurality of arc extinguishing grid pieces; the protective cover is clamped into the clamping grooves through the buckles and is detachably mounted between the two arc-isolating walls.

5. The arc extinguishing structure applied to the circuit breaker according to claim 4,

the blocking portion is provided with an arc-cutting groove for enabling free electric arcs carried by the moving contact to enter the arc extinguishing assembly.

6. The arc extinguishing structure applied to the circuit breaker according to claim 5,

the groove wall of the arc-cutting groove is a guide inclined plane capable of guiding the free electric arc to enter the arc-extinguishing component.

7. The arc extinguishing structure applied to the circuit breaker according to claim 1,

and a blocking part used for limiting the movement of the movable contact is formed at one end of the moving guide groove far away from the fixed contact.

8. The arc extinguishing structure applied to the circuit breaker according to claim 7,

the blocking part is made of elastic material.

9. The arc extinguishing structure applied to the circuit breaker according to claim 1,

an installation groove for clamping and installing the static contact is formed at the end part of the protective cover; the mounting structure of the static contact is attached to the groove wall of the mounting groove.