CN211929420U

CN211929420U - Small-size residual current circuit breaker with narrow slit arc extinguishing structure

Info

Publication number: CN211929420U
Application number: CN202020900450.7U
Authority: CN
Inventors: 吴磊
Original assignee: Gret Electric Co ltd
Current assignee: Gret Electric Co ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2020-11-13
Anticipated expiration: 2030-05-26

Abstract

A small-sized leakage circuit breaker with a narrow slit arc extinguishing structure. The problem of current small-size earth leakage circuit breaker N utmost point electric arc extinguish difficulty is solved. The arc spraying device comprises a shell, an arc guiding cavity and an arc guiding channel are arranged in the shell, a static contact piece and a movable contact piece are arranged in the arc guiding cavity, the movable contact piece is provided with a first position separated from the static contact piece and a second position attached to the static contact piece, an arc spraying opening is formed in the side wall of the shell, and the arc guiding cavity is communicated with the arc spraying opening through the arc guiding channel. The beneficial effects of the utility model are that, set up the arc spout on the casing lateral wall, elongate electric arc through leading the arc passageway, and the working distance is longer in the casing, makes electric arc effectively extinguish, avoids the guide rail electrified, and the security is high. The utility model discloses simple structure still has, convenient assembling, and the action is reliable, advantages such as long service life.

Description

Small-size residual current circuit breaker with narrow slit arc extinguishing structure

Technical Field

The utility model relates to a 1PN miniature residual current circuit breaker's N utmost point electric arc extinguishes structure, concretely relates to miniature residual current circuit breaker with narrow slit arc extinguishing structure.

Background

The miniature circuit breaker is a current-limiting type circuit breaker with overload and short-circuit protection, is suitable for overload short-circuit protection of industrial and commercial lighting power distribution systems, and can also be used for infrequent on-off switching of lines under normal conditions. For monopole circuit breaker adds zero line control among the small-size electric leakage circuit breaker of 1PN, wherein monopole circuit breaker possesses the thermomagnetic dropout function, is applicable to single-phase two-wire system return circuit, is used for controlling live wire (phase line) usually, and the N utmost point is zero line control (N line). The structure of the existing small-sized residual current circuit breaker is formed by assembling the circuit breaker and a residual current tripping module, the volume is large, the cost is high, and an N pole does not have a breaking and isolating function. The biggest defect of small-size earth leakage circuit breaker is that the N utmost point space is limited (can't set up the explosion chamber), and electric arc extinguishes the difficulty, leads to electric arc not to discharge, and present way is direct to set up one in the bottom of casing and spouts the arc mouth, should spout the arc mouth and adopt perpendicular direct opening mostly, aims at the installation guide rail, leads to the electric arc stroke short, and the arc extinguishing divides disconnected difficulty, and makes the guide rail electrified easily, interelectrode short circuit, and electric arc reignites, has great potential safety hazard.

SUMMERY OF THE UTILITY MODEL

For solving the problem that the N utmost point electric arc of current small-size earth leakage circuit breaker extinguishes the difficulty among the background art, the utility model provides a small-size earth leakage circuit breaker with narrow slit arc extinguishing structure.

The technical scheme of the utility model is that: the small-sized residual current circuit breaker with the narrow slit arc extinguishing structure comprises a shell, wherein an arc striking cavity and an arc guide channel are arranged in the shell, a static contact piece and a movable contact piece are arranged in the arc striking cavity, the movable contact piece is provided with a first position separated from the static contact piece and a second position attached to the static contact piece, an arc spraying opening is formed in the side wall of the shell, and the arc striking cavity is communicated with the arc spraying opening through the arc guide channel.

As an improvement of the utility model, the arc guide channel is in a long strip shape.

As a further improvement of the utility model, the arc guide channel is arranged at the bottom of the inner wall of the shell.

As a further improvement, the casing in be equipped with first striking and second striking, first striking locate to be close to static contact department and extend to the arc passageway, the second striking locate to be close to movable contact department and extend to the arc passageway.

As a further improvement of the utility model, the first arc striking piece is provided with a convex arc guiding part towards the direction of the movable contact piece.

As a further improvement of the utility model, one end of the second arc striking piece is inserted into the arc guiding channel and extends towards the arc spraying opening.

As a further improvement of the utility model, the shell inner wall be equipped with a plurality of baffles in striking chamber department, form the striking passageway between two adjacent baffles.

As a further improvement of the utility model, the partition board is in an arc shape.

As a further improvement, the arc guiding channel and the arc spraying port are provided with a separation cavity, the separation cavity is internally provided with a plurality of separation plates, and the separation plates separate the arc spraying port into a plurality of parts.

As a further improvement of the utility model, the division board have two, the division board on be equipped with the opening that makes the compartment communicate each other, the spout arc mouth have threely.

The beneficial effects of the utility model are that, set up the arc spout on the casing lateral wall, elongate electric arc through leading the arc passageway, and the working distance is longer in the casing, makes electric arc effectively extinguish, avoids the guide rail electrified, and the security is high. The utility model discloses simple structure still has, convenient assembling, and the action is reliable, advantages such as long service life.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of the housing 1 according to the embodiment of the present invention.

Fig. 3 is a schematic structural view in the other direction of fig. 2.

Fig. 4 is a schematic structural diagram of the housing 1 according to the embodiment of the present invention.

In the figure, 1, a housing; 11. an arc ignition cavity; 12. an arc guide channel; 13. spraying an arc opening; 14. a partition plate; 15. an arc striking channel; 16. a separation chamber; 17. a partition plate; 171. an opening; 2. a static contact piece; 3. a movable contact spring; 4. a first arc striking plate; 41. an arc guide part; 5. a second arc striking plate; 6. an arc is simulated.

Detailed Description

The embodiments of the present invention will be further explained with reference to the accompanying drawings:

referring to fig. 2-4 in conjunction with fig. 1, a small residual current circuit breaker with a narrow slit arc extinguishing structure includes a housing 1, in the present invention, the housing generally includes an upper cover, a middle cover and a lower cover, and fig. 4 is a schematic structural view of the middle cover. An arc leading cavity 11 and an arc leading channel 12 are arranged in the shell 1, a static contact piece 2 and a movable contact piece 3 are arranged in the arc leading cavity 11, the movable contact piece 3 is provided with a first position separated from the static contact piece 2 and a second position attached to the static contact piece 2, an arc spraying opening 13 is formed in the side wall of the shell 1, and the arc leading cavity 11 is communicated with the arc spraying opening 13 through the arc leading channel 12. The beneficial effects of the utility model are that, set up the arc spout on the casing lateral wall, elongate electric arc through leading the arc passageway, and the working distance is longer in the casing, makes electric arc effectively extinguish, avoids the guide rail electrified, and the security is high. The utility model discloses simple structure still has, convenient assembling, and the action is reliable, advantages such as long service life. When a short-circuit fault occurs to a circuit, the static contact and the moving contact are separated to generate an electric arc, the electric arc rapidly passes through the arc striking plate by the magnetic field force F when the static contact and the moving contact are separated, then passes through the slender narrow slit arc channel (arc guide channel) of the shell to elongate the electric arc, the residual electric arc passes through the separation cavity and is separated by the separation plate, the residual electric arc is absorbed through space amplification, and the electric arc is ensured to be rapidly cooled and extinguished.

The arc guide channel 12 is in a strip shape. Specifically, the arc guide channel 12 is arranged at the bottom of the inner wall of the shell 1. The structure is convenient for rapid and reliable arc striking and arc extinguishing, and the electric arc can not influence other parts of the N level.

The shell 1 is internally provided with a first arc striking piece 4 and a second arc striking piece 5, the first arc striking piece 4 is arranged at a position close to the static contact piece 2 and extends to the arc guiding channel 12, and the second arc striking piece 5 is arranged at a position close to the movable contact piece 3 and extends to the arc guiding channel 12. Specifically, the first arc striking piece 4 is provided with an arc guiding part 41 protruding towards the moving contact piece 3. Specifically, the first arc striking piece (cathode arc striking piece) is connected with the static contact piece, the second arc striking piece (anode arc striking piece) is connected with the double-metal piece, and the arc part is arranged to enable the arc to move stably and facilitate reliable arc striking.

One end of the second arc striking piece 5 is inserted into the arc guiding channel 12 and extends towards the arc spraying opening 13. The structure enables electric arcs to rapidly and reliably enter the arc guide channel, so that arc striking and arc extinguishing of products are reliable.

A plurality of partition plates 14 are arranged on the inner wall of the shell 1 at the arc striking cavity 11, and an arc striking channel 15 is formed between every two adjacent partition plates 14. Specifically, the partition 14 is arc-shaped. The structure is convenient for cutting electric arcs and striking the arcs.

A separation cavity 16 is arranged between the arc guiding channel 12 and the arc spraying opening 13, a plurality of separation plates 17 are arranged in the separation cavity 16, and the arc spraying opening 13 is separated into a plurality of separation plates 17. Specifically, there are two partition plates 17, the partition plates 17 are provided with openings 171 for communicating the partitioned chambers 16 with each other, and there are three arc spraying ports 13. The structure is convenient for cutting electric arc, and is convenient for arc striking and arc extinguishing. The residual electric arc passes through the separation cavity and is divided by the partition plate, and the residual electric arc is absorbed through space amplification, so that the electric arc is ensured to be rapidly cooled and extinguished.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the 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" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, 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. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the present invention has been described in accordance with the above embodiments, the inventive concept is not limited to this embodiment, and any modification of the inventive concept will be included in the scope of the patent claims.

Claims

1. A small-sized residual current circuit breaker with a narrow slit arc extinguishing structure comprises a shell (1) and is characterized in that an arc leading cavity (11) and an arc guiding channel (12) are arranged in the shell (1), a static contact piece (2) and a movable contact piece (3) are arranged in the arc leading cavity (11), the movable contact piece (3) is provided with a first position separated from the static contact piece (2) and a second position attached to the static contact piece (2), an arc spraying opening (13) is formed in the side wall of the shell (1), and the arc leading cavity (11) is communicated with the arc spraying opening (13) through the arc guiding channel (12).

2. A miniature residual current circuit breaker provided with a narrow slit arc extinguishing structure according to claim 1, characterized in that said arc guiding channel (12) is elongated.

3. A miniature residual current circuit breaker provided with a narrow slit arc extinguishing structure according to claim 1, characterized in that said arc guiding channel (12) is provided at the bottom of the inner wall of the case (1).

4. A miniature residual current circuit breaker with a narrow slit arc extinguishing structure according to claim 1, characterized in that said housing (1) is provided with a first arc striking plate (4) and a second arc striking plate (5), said first arc striking plate (4) being disposed near said stationary contact (2) and extending to said arc guiding channel (12), said second arc striking plate (5) being disposed near said movable contact (3) and extending to said arc guiding channel (12).

5. A miniature residual current circuit breaker with narrow slit arc extinguishing structure according to claim 4, characterized in that the first arc striking plate (4) is provided with an arc guiding part (41) protruding towards the moving contact plate (3).

6. A miniature residual current circuit breaker with narrow slit arc extinguishing structure according to claim 4, characterized in that one end of the second arc striking plate (5) is inserted into the arc guiding channel (12) and extends towards the arc spraying opening (13).

7. A miniature residual current circuit breaker provided with a narrow slit arc extinguishing structure according to claim 1, characterized in that the inner wall of the housing (1) is provided with a plurality of partitions (14) at the arc striking chamber (11), and an arc striking channel (15) is formed between two adjacent partitions (14).

8. A miniature residual current circuit breaker with narrow slit arc extinguishing structure according to claim 7, characterized in that said partition (14) is arc-shaped.

9. A miniature residual current circuit breaker with narrow slit arc extinguishing structure according to claim 1, wherein a separation chamber (16) is provided between the arc guiding channel (12) and the arc spraying opening (13), a plurality of partition plates (17) are provided in the separation chamber (16), and the partition plates (17) divide the arc spraying opening (13) into a plurality of parts.

10. A small-sized residual current circuit breaker provided with a narrow slit arc extinguishing structure according to claim 9, wherein there are two of said partition plates (17), said partition plates (17) are provided with openings (171) for communicating the partitioned chambers (16) with each other, and there are three of said arc spraying openings (13).