A small circuit breaker with good arc striking effect

Abstract

The utility model provides a small circuit breaker with good arc striking effect. The utility model mainly solves the problem that the effect of the conventional small circuit breaker is not good because the conventional small circuit breaker is provided with only one set of magnetic conductive sheet in the shell for arc guiding. The utility model is characterized in that: the shell is provided with an arc guiding cover (5) inside, the arc guiding cover (5) is provided with an arc guiding groove (51) inside, one end of the arc guiding groove (51) is arranged opposite to the movable contact, and the other end of the arc guiding groove (51) is arranged opposite to the arc extinguishing chamber; two sets of magnetic conductive sheets (6) are arranged, one of the two sets of magnetic conductive sheets (6) is arranged on one side of the outer wall of the arc guiding cover, and the other of the two sets of magnetic conductive sheets (6) is arranged on the other side of the outer wall of the arc guiding cover and opposite to the arc guiding groove. The utility model provides a small circuit breaker with good arc striking effect, and the arc guiding cover is arranged for arc guiding, and the arc guiding is more concentrated. Furthermore, the multiple sets of magnetic conductive sheets are arranged as an optimization, and the arc guiding effect is better.

Description

Technical Field

[0001] This utility model relates to the field of circuit breakers, specifically to a small circuit breaker with good arc ignition effect. Background Technology

[0002] Miniature circuit breakers, also known as micro circuit breakers, are suitable for overload and short-circuit protection of circuits, and can also be used for infrequent switching of circuits under normal conditions. Miniature circuit breakers are mainly used in various places such as industrial, commercial, high-rise buildings, and residential buildings.

[0003] Most conventional miniature circuit breakers only have a set of magnetic plates inside the casing for arc guiding, which is generally ineffective. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a miniature circuit breaker with good arc-initiating effect, which mainly solves the problem that most conventional miniature circuit breakers only set a set of magnetic plates in the housing for arc-initiating purposes, which is not very effective.

[0005] The technical solution of this utility model is as follows:

[0006] A miniature circuit breaker with good arc-initiating effect includes a housing, within which an arc-extinguishing chamber and opposing stationary and moving contacts are provided.

[0007] An arc guide cover is disposed inside the housing, and an arc guide groove is provided inside the arc guide groove. One end of the arc guide groove is disposed opposite to the moving contact, and the other end is disposed opposite to the arc extinguishing chamber.

[0008] Two magnetic conductive sheets are arranged in a group, one on one side of the outer wall of the arc guide cover and the other on the other side of the outer wall of the arc guide cover, and are arranged opposite to the arc guide groove.

[0009] It also includes an arc guide plate, part of which is disposed inside the arc guide cover, with its tail end positioned opposite to the arc extinguishing chamber.

[0010] The magnetic conductive sheet includes a first magnetic conductive sheet and a second magnetic conductive sheet. The first magnetic conductive sheet is disposed opposite to the moving contact, and the second magnetic conductive sheet is disposed in front of the arc-extinguishing chamber.

[0011] The outer wall of the arc guide cover is provided with a locking block, and the first magnetic sheet is provided with a locking groove that cooperates with the locking block.

[0012] The inner wall of the housing is provided with a limiting frame, which contacts the outer wall of the arc guide cover to form a limiting groove, and the second magnetic sheet is disposed in the limiting groove.

[0013] A second arc guide plate is provided on the back of the arc guide plate located inside the arc guide cover.

[0014] The inner wall of the arc guide cover is provided with several arc-guiding ribs.

[0015] The arc guide cover includes an upper cover and a lower cover, and the upper cover and the lower cover are detachably connected.

[0016] The lower cover is provided with a positioning pin, and the upper cover is provided with a positioning hole that cooperates with the positioning pin.

[0017] The beneficial effects of this utility model are: this utility model provides a small circuit breaker with good arc-initiating effect, and sets an arc-guiding cover for arc guiding, which is more concentrated and guided; moreover, as a preferred option, multiple sets of magnetic sheets can better perform the arc guiding function. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0019] Figure 2 This is a partial perspective view of one embodiment of the present invention.

[0020] Figure 3 This is a partial explosion diagram of one embodiment of the present invention.

[0021] Figure 4 This is a partial perspective view of one embodiment of the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings. A miniature circuit breaker with good arc-initiating effect includes a housing 1, an arc-extinguishing chamber 2, and stationary contacts 3 and moving contacts 4 arranged opposite to each other inside the housing. It also includes an arc-guiding cover 5 disposed inside the housing, with an arc-guiding groove 51 inside. One end of the arc-guiding groove is arranged opposite to the moving contact, and the other end is arranged opposite to the arc-extinguishing chamber. Two magnetic conductive sheets 6 are arranged in pairs, one on one outer wall of the arc-guiding cover and the other on the other outer wall of the arc-guiding cover, opposite to the arc-guiding groove. The arc-guiding cover has an opening slot 500 for one end of the moving contact to extend into. Similarly, it also has an opening for the stationary contact to be located inside the arc-guiding cover. The magnetic conductive sheets are arranged in pairs at both ends of the arc-guiding cover, and multiple sets can be arranged.

[0023] In this embodiment, as shown in the figure, an arc guide plate 7 is also included. Part of the arc guide plate is disposed inside the arc guide cover, with its tail end opposite to the arc extinguishing chamber. The arc guide cover has a through groove for the arc guide plate to pass through, and the placement of part of the arc guide plate inside the arc guide cover enhances the arc guiding effect.

[0024] In this embodiment, as shown in the figure, the magnetic conductive sheet includes a first magnetic conductive sheet 61 and a second magnetic conductive sheet 62. The first magnetic conductive sheet is disposed opposite to the moving contact, and the second magnetic conductive sheet is disposed in front of the arc-extinguishing chamber. This enables better arc extinguishing.

[0025] In this embodiment, as shown in the figure, the outer wall of the arc guide cover is provided with a locking block 53, and the first magnetic sheet is provided with a locking groove that cooperates with the locking block. This facilitates easy assembly and disassembly.

[0026] In this embodiment, as shown in the figure, a limiting frame 11 is provided on the inner wall of the housing. The limiting frame contacts the outer wall of the arc guide cover to form a limiting groove, and the second magnetic sheet is disposed in the limiting groove. Disassembly and assembly are convenient.

[0027] In this embodiment, as shown in the figure, a second arc guide plate 71 is provided on the back of the arc guide plate located inside the arc guide cover. To enhance the effect, the two can be connected together by welding.

[0028] In this embodiment, as shown in the figure, the inner wall of the arc guide cover is provided with a plurality of arc-guiding ribs 55.

[0029] In this embodiment, as shown in the figure, the arc guide cover includes an upper cover 501 and a lower cover 502, which are detachably connected. Quick assembly can be achieved through methods such as plugging or snapping.

[0030] In this embodiment, as shown in the figure, the lower cover is provided with a positioning pin 503, and the upper cover is provided with a positioning hole that cooperates with the positioning pin. Disassembly and assembly are relatively convenient.

[0031] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The embodiments should not be considered as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A miniature circuit breaker with good arc-initiating effect, comprising a housing (1), wherein an arc-extinguishing chamber (2) and stationary contacts (3) and moving contacts (4) arranged opposite to each other are provided in the housing, characterized in that: Also includes An arc guide cover (5) is provided inside the housing, and an arc guide groove (51) is provided inside it. One end of the arc guide groove is opposite to the moving contact, and the other end is opposite to the arc extinguishing chamber. Two magnetic conductive sheets (6) are arranged in a group, one on one side of the outer wall of the arc guide cover and the other on the other side of the outer wall of the arc guide cover, and are arranged opposite to the arc guide groove.

2. A miniature circuit breaker with good arc-initiating effect according to claim 1, characterized in that: It also includes an arc guide plate (7), part of which is located inside the arc guide cover, with its tail end positioned opposite to the arc extinguishing chamber.

3. A miniature circuit breaker with good arc-initiating effect according to claim 1, characterized in that: The magnetic conductive sheet includes a first magnetic conductive sheet (61) and a second magnetic conductive sheet (62). The first magnetic conductive sheet is disposed opposite to the moving contact, and the second magnetic conductive sheet is disposed in front of the arc-extinguishing chamber.

4. A miniature circuit breaker with good arc-initiating effect according to claim 3, characterized in that: The outer wall of the arc guide cover is provided with a locking block (53), and the first magnetic sheet is provided with a slot that cooperates with the locking block.

5. A miniature circuit breaker with good arc-initiating effect according to claim 4, characterized in that: The inner wall of the housing is provided with a limiting frame (11), which contacts the outer wall of the arc guide cover to form a limiting groove, and the second magnetic sheet is disposed in the limiting groove.

6. A miniature circuit breaker with good arc-initiating effect according to claim 2, characterized in that: A second arc plate (71) is provided on the back of the arc plate located inside the arc cover.

7. A miniature circuit breaker with good arc-initiating effect according to claim 1, characterized in that: The inner wall of the arc guide cover is provided with several arc-guiding ribs (55).

8. A miniature circuit breaker with good arc-initiating effect according to any one of claims 1-7, characterized in that: The arc guide cover includes an upper cover (501) and a lower cover (502), and the upper cover and the lower cover are detachably connected.

9. A miniature circuit breaker with good arc-initiating effect according to claim 8, characterized in that: The lower cover is provided with a positioning pin (503), and the upper cover is provided with a positioning hole that cooperates with the positioning pin.

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