Circuit breaker of N-pole arc extinguishing mechanism

Abstract

The utility model discloses a circuit breaker of an N-pole arc extinguishing mechanism. The circuit breaker mainly solves the problem that a conventional circuit breaker does not have good arc extinguishing and discharging functions at an N pole. The device is characterized by further comprising a support (21) which is rotatably arranged in the N-pole chamber; the movable contact piece (22) is arranged on the bracket; the static contact piece (23) is arranged in the N-pole chamber and is arranged opposite to the movable contact piece; and the arc discharge channel (24) is arranged in the N-pole chamber, one end of the arc discharge channel is arranged opposite to the static contact piece, the other end of the arc discharge channel is communicated with the outside, and the arc discharge channel is of a circumferentially closed channel structure. According to the circuit breaker of the N-pole arc extinguishing mechanism provided by the utility model, flashover of the N pole can be discharged through the arc discharge channel, so that the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to a circuit breaker with an N-pole arc extinguishing mechanism. Background Art

[0002] A circuit breaker is a switching device that can close, carry and interrupt current under normal circuit conditions and can close, carry and interrupt current under abnormal circuit conditions within a specified time.

[0003] At present, some circuit breakers are provided with an action mechanism at the L pole to realize disconnection, and an action structure is also provided at the N pole to cooperate with the disconnection of the N pole. However, the disconnection structure provided at the N pole does not have a good function of discharging and extinguishing the arc. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the utility model provides a leakage protection switch with a terminal isolation protection structure, which mainly solves the problem that conventional circuit breakers do not have a good arc extinguishing and arc discharge function at the N pole.

[0005] The technical solution of the utility model is:

[0006] A circuit breaker with an N-pole arc extinguishing mechanism comprises a shell, wherein an N-pole chamber and an L-pole chamber are arranged in the shell, a first action mechanism is arranged in the L-pole chamber, and further comprises a bracket rotatably arranged in the N-pole chamber; a moving contact piece arranged on the bracket; a stationary contact piece arranged in the N-pole chamber and arranged opposite to the moving contact piece; an arc discharge channel arranged in the N-pole chamber, which is a circumferentially closed channel structure with one end arranged opposite to the stationary contact piece and the other end connected to the outside.

[0007] The inner wall of the N-pole chamber is provided with two convex ridges, and also includes a top cover, which is arranged on the upper end surface of the convex ridge, and the top cover and the inner wall of the convex ridge form the arc discharge channel.

[0008] The outer wall of the bottom of the shell is provided with an arc discharge hole communicated with the arc discharge channel.

[0009] A detachably connected partition cover is provided in the N-pole chamber, and the partition cover is used to separate the static contact piece and the circuit board from the bottom and the top.

[0010] A plurality of retaining walls are arranged in the N-pole chamber, a plurality of latches are arranged on the retaining walls, and a latching groove cooperating with the latches is arranged on the partition cover.

[0011] At least a portion of the bottom end surface of the partition cover contacts the top end surface of the barrier wall.

[0012] At least one of the retaining walls is provided with a recessed groove, and the stationary contact piece is installed in the recessed groove.

[0013] A pressing block is provided at the bottom of the partition cover, and the pressing block is pressed against the upper end surface inside the static contact piece.

[0014] The beneficial effects of the utility model are as follows: the utility model provides a circuit breaker with an N-pole arc extinguishing mechanism, the arc at the N-pole can be discharged through an arc discharge channel, thereby increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is an exploded schematic diagram of an embodiment of the utility model.

[0016] Figure 2 It is a partial three-dimensional schematic diagram of an embodiment of the utility model.

[0017] Figure 3 It is a partial three-dimensional schematic diagram of an embodiment of the utility model.

[0018] Figure 4 It is a partial cross-sectional schematic diagram of an embodiment of the utility model.

[0019] Figure 5 The figure is a three-dimensional schematic diagram of a protective cover according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings: As shown in the figure, a circuit breaker with an N-pole arc extinguishing mechanism includes a housing 1, wherein an N-pole chamber 2 and an L-pole chamber 3 are provided in the housing, wherein a first action mechanism 31 is provided in the L-pole chamber, and further includes a bracket 21, which is rotatably provided in the N-pole chamber; a moving contact piece 22, which is provided on the bracket; a stationary contact piece 23, which is provided in the N-pole chamber and is arranged opposite to the moving contact piece; and an arc discharge channel 24, which is provided in the N-pole chamber and is a circumferentially closed channel structure, which is arranged opposite to the stationary contact piece at one end and connected to the outside at the other end. The first action mechanism is a conventional technology, including a first bracket, a first moving contact, etc. In addition, a bracket is also provided in the N-pole, and the bracket and the first bracket can rotate synchronously or can be linked to the first action mechanism and the second action structure (N-pole) through a transmission needle. It is an existing technology and will not be repeated. The arc discharge channel discharges the high-pressure arc-carrying gas in the N-pole chamber to play the role of arc extinguishing.

[0021] In this embodiment, as shown in the figure, the inner wall of the N-pole chamber is provided with two convex ridges 241, and also includes a top cover 242, the top cover is provided on the upper end surface of the convex ridge, and the top cover and the inner wall of the convex ridge form the arc discharge channel. The top cover is provided on the convex ridge, and the inner walls of the two form the above-mentioned arc discharge channel.

[0022] In this embodiment, as shown in the figure, the outer wall of the bottom of the housing is provided with an arc discharge hole 10 communicating with the arc discharge channel, so as to better discharge the arc.

[0023] In this embodiment, as shown in the figure, a detachable shield 4 is provided in the N-pole chamber, and the shield is used to separate the static contact piece from the bottom and top of the circuit board, and plays the role of arc isolation. The circuit board can be punched and installed on the pin 43 on the shield.

[0024] In this embodiment, as shown in the figure, a plurality of retaining walls 25 are provided in the N-pole chamber, a plurality of latches 251 are provided on the retaining walls, and a latching groove 41 cooperating with the latches is provided on the partition cover.

[0025] In this embodiment, as shown in the figure, at least a portion of the bottom end surface of the partition cover contacts the top end surface of the barrier wall.

[0026] In this embodiment, as shown in the figure, at least one of the retaining walls is provided with a sink 252, and the stationary contact piece is installed in the sink, making installation more convenient.

[0027] In this embodiment, as shown in the figure, a pressing block 42 is provided at the bottom of the partition cover, and the pressing block presses against the upper end surface of the static contact piece. After the partition cover is installed, the pressing block can be pressed on the static contact piece, and the installation is more stable. The partition cover is made of one piece with the top cover.

[0028] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and 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 therefore cannot be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] The embodiments described with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention. The embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A circuit breaker with an N-pole arc extinguishing mechanism, comprising a housing (1), wherein an N-pole chamber (2) and an L-pole chamber (3) are provided in the housing, wherein a first actuating mechanism (31) is provided in the L-pole chamber, characterized in that: Also includes A bracket (21) is rotatably disposed in the N-pole chamber; A movable contact piece (22) is arranged on the bracket; A stationary contact piece (23) is arranged in the N-pole chamber and is arranged opposite to the moving contact piece; The arc discharge channel (24) is arranged in the N-pole chamber and is a circumferentially closed channel structure with one end arranged opposite to the static contact piece and the other end communicating with the outside.

2. A circuit breaker with an N-pole arc extinguishing mechanism according to claim 1, characterized in that: The inner wall of the N-pole chamber is provided with two convex ridges (241), and also includes a top cover (242), the top cover is arranged on the upper end surface of the convex ridge, and the top cover and the inner wall of the convex ridge form the arc discharge channel.

3. A circuit breaker with an N-pole arc extinguishing mechanism according to claim 2, characterized in that: An arc discharge hole (10) communicating with the arc discharge channel is provided on the outer wall of the bottom of the shell.

4. A circuit breaker with an N-pole arc extinguishing mechanism according to claim 3, characterized in that: A detachably connected partition cover (4) is provided in the N-pole chamber, and the partition cover is used to separate the static contact piece and the circuit board from the bottom and the top.

5. A circuit breaker with an N-pole arc extinguishing mechanism according to claim 4, characterized in that: A plurality of retaining walls (25) are provided in the N-pole chamber, a plurality of latching pins (251) are provided on the retaining walls, and a latching groove (41) matching with the latching pins is provided on the partition cover.

6. A circuit breaker with an N-pole arc extinguishing mechanism according to claim 5, characterized in that: At least a portion of the bottom end surface of the partition cover contacts the top end surface of the barrier wall.

7. A circuit breaker with an N-pole arc extinguishing mechanism according to claim 6, characterized in that: At least one of the retaining walls is provided with a sink groove (252), and the stationary contact piece is installed in the sink groove.

8. A circuit breaker with an N-pole arc extinguishing mechanism according to claim 7, characterized in that: A pressing block (42) is provided at the bottom of the partition cover, and the pressing block presses against the upper end surface inside the stationary contact piece.

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