Operating mechanism of circuit breaker

Abstract

Provided is an operating mechanism of a circuit breaker. Mainly solves the problem that a magnet yoke and a contact torsion spring of a conventional circuit breaker release are easy to cause interphase short circuit under the action of an electric arc. The circuit breaker is characterized in that the circuit breaker also comprises a mounting shaft (31) which is arranged on the support and is used for mounting the moving contact; the torsional spring (5) is sleeved on the mounting shaft and is used for providing pretightening force for the moving contact to rotate towards the closing direction; the partition plate (32) is arranged on the edge of the support and comprises a first section (321) and a second section (322) which are connected with each other, and the first section is arranged between the release and the torsional spring; and the second section is correspondingly arranged below the torsion spring and above the static contact. The utility model provides an operating mechanism of a circuit breaker, which is isolated by the partition plates, prevents interphase short circuit, and can be used for blocking upwards running electric arcs during opening.

Description

Technical Field

[0001] This utility model relates to the field of switchgear, specifically to an operating mechanism for a circuit breaker. Background Technology

[0002] Miniature circuit breakers are characterized by advanced structure, reliable performance, strong breaking capacity, and compact and aesthetically pleasing design. They can be used for overload and short-circuit protection of lighting, power distribution lines and equipment in office buildings, residences, and similar buildings, and can also be used for infrequent switching and connection operations. They are mainly used in various places such as industrial, commercial, high-rise, and residential buildings.

[0003] Currently, the (L-pole) magnetic yoke and (N-pole) contact torsion spring of the circuit breaker trip unit are prone to phase-to-phase short circuits under the action of electric arc. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides an operating mechanism for a circuit breaker, which mainly solves the problem that the magnetic yoke and contact torsion spring of a conventional circuit breaker trip unit are prone to phase-to-phase short circuits under the action of an electric arc.

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

[0006] An operating mechanism for a circuit breaker includes a housing, within which a trip unit, a stationary contact, and a rotatably mounted bracket are disposed. A rotatably mounted moving contact is also disposed on the bracket.

[0007] A mounting shaft is provided on the bracket for mounting the moving contact.

[0008] A torsion spring, sleeved on the mounting shaft, is used to provide a preload force for the moving contact to rotate in the closing direction;

[0009] A partition, located at the edge of the bracket, includes a first section and a second section connected to each other. The first section is located between the trip unit and the torsion spring; the second section is located below the torsion spring and above the stationary contact.

[0010] The height of the partition is not lower than the height of the mounting shaft.

[0011] The bracket is provided with a stop block, the torsion spring includes a pin, the side of the stop block facing away from the trip unit is provided with a mounting groove, and one of the pins is provided in the mounting groove.

[0012] The bracket is provided with a rotatably mounted cam, and the moving contact is provided with a boss, which contacts the cam.

[0013] The boss has a contact surface in its circumference for contacting the cam.

[0014] The bracket is provided with a rotating shaft, and the cam is provided with a shaft hole that engages with the rotating shaft.

[0015] The cam is located on the opposite side of the partition.

[0016] The first segment is an arc-shaped plate.

[0017] The first and second segments are made as a single piece.

[0018] The beneficial effects of this utility model are: This utility model provides an operating mechanism for a circuit breaker, which prevents phase-to-phase short circuits by isolating the circuit with a partition, and can also be used to block upward-running electric arcs when the circuit is opened. Attached Figure Description

[0019] Figure 1 This is a perspective view of one embodiment of the present invention.

[0020] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0021] Figure 3 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. An operating mechanism for a circuit breaker includes a housing 1, within which a trip unit 2, a stationary contact 6, and a rotatably mounted bracket 3 are provided. A rotatably mounted moving contact 4 is mounted on the bracket. The mechanism also includes a mounting shaft 31 mounted on the bracket for mounting the moving contact; a torsion spring 5 sleeved on the mounting shaft for providing preload force to the moving contact in the closing direction; and a partition 32 located at the edge of the bracket, comprising a first section 321 and a second section 322 connected to each other. The first section is located between the trip unit and the torsion spring; the second section is located below the torsion spring and above the stationary contact. The partition isolates the trip unit, preventing phase-to-phase short circuits. Furthermore, during opening, the second section can block the upward arc at the stationary contact, preventing short circuits and enhancing safety.

[0023] In this embodiment, as shown in the figure, the height of the partition is not lower than the height of the mounting shaft. Increasing the height of the barrier prevents short circuits.

[0024] In this embodiment, as shown in the figure, the bracket is provided with a stop block 33, and the torsion spring includes a lead 51. The side of the stop block facing away from the trip unit has a mounting groove 331, and one of the leads is disposed in the mounting groove. The front of the stop block faces the trip unit, and the mounting groove is provided inside. Inserting the lead into the mounting groove can also increase the protection effect.

[0025] In this embodiment, as shown in the figure, the bracket is provided with a rotatably mounted cam 34, and the moving contact is provided with a boss 41, which contacts the cam. The maximum opening distance of the moving contact can be adjusted by rotating the cam. Specifically, the maximum rotation angle of the moving contact is determined by the position of the cam and the contact surface, and can be adjusted by adjusting the rotation angle of the cam.

[0026] In this embodiment, as shown in the figure, the boss has a contact surface 411 circumferentially for contacting the cam. This contact surface can be an inclined surface or an arc-shaped surface.

[0027] In this embodiment, as shown in the figure, the bracket is provided with a rotating shaft 35, and the cam is provided with a shaft hole 342 that engages with the rotating shaft. The shaft hole and the rotating shaft can be connected together by an interference fit.

[0028] In this embodiment, as shown in the figure, the cam is located on the side facing away from the partition. The facing side is the direction where the trip unit is located.

[0029] In this embodiment, as shown in the figure, the first segment is an arc-shaped plate.

[0030] In this embodiment, as shown in the figure, the first segment and the second segment are integrally manufactured.

[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. An operating mechanism for a circuit breaker, comprising a housing (1), wherein a trip unit (2), a stationary contact (6), and a rotatably mounted bracket (3) are disposed within the housing, and a rotatably mounted moving contact (4) is disposed on the bracket, characterized in that: Also includes Mounting shaft (31) is provided on the bracket for mounting the moving contact; A torsion spring (5) is sleeved on the mounting shaft to provide a preload force for the moving contact to rotate in the closing direction; The partition (32) is located at the edge of the bracket and includes a first section (321) and a second section (322) connected to each other. The first section is located between the trip unit and the torsion spring; the second section is located below the torsion spring and above the stationary contact.

2. The operating mechanism of a circuit breaker according to claim 1, characterized in that: The height of the partition is not lower than the height of the mounting shaft.

3. The operating mechanism of a circuit breaker according to claim 1, characterized in that: The bracket is provided with a stop (33), the torsion spring includes a pin (51), the side of the stop facing away from the trip unit is provided with a mounting groove (331), and one of the pins is located in the mounting groove.

4. The operating mechanism of a circuit breaker according to claim 3, characterized in that: The bracket is provided with a rotatably mounted cam (34), and the moving contact is provided with a boss (41), which contacts the cam.

5. The operating mechanism of a circuit breaker according to claim 4, characterized in that: The boss has a contact surface (411) in its circumferential direction for contacting the cam.

6. The operating mechanism of a circuit breaker according to claim 5, characterized in that: The bracket is provided with a rotating shaft (35), and the cam is provided with a shaft hole (342) that engages with the rotating shaft.

7. The operating mechanism of a circuit breaker according to claim 6, characterized in that: The cam is located on the opposite side of the partition.

8. The operating mechanism of a circuit breaker according to claim 7, characterized in that: The first segment is an arc-shaped plate.

9. The operating mechanism of a circuit breaker according to claim 8, characterized in that: The first and second segments are made as a single piece.

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