一种高分断小型断路器

Abstract

本实用新型属于低压电器领域，具体涉及一种高分断小型断路器，包括壳体、操作机构、动触头、静触头、灭弧室，壳体内设有电弧引导系统，电弧引导系统包括磁吹单元、静侧导引单元、动侧导向单元，磁吹单元用于产生驱动电弧运动的磁场；静侧导引单元用于引导静触头侧的电弧根部；动侧导向单元用于为动触头侧的电弧提供指向灭弧室的平滑路径；磁吹单元与动侧导向单元的空间位置相配合，共同引导动触头侧的电弧弧柱；静侧导引单元独立引导静触头侧的电弧；各单元协同作用，共同实现电弧向灭弧室的导入与熄灭；本实用新型通过电弧引导系统对动、静触头两侧的电弧进行独立且协同的引导，确保电弧被快速、整体地拉长并导入灭弧栅片，实现快速灭弧。

Claims

1. A high breaking miniature circuit breaker comprising a housing, an operating mechanism, a movable contact, a stationary contact and an arc chute, characterized in that: The housing contains a synergistic arc guiding system, which includes a magnetic blow-out unit, a stationary guide unit, and a moving guide unit. The magnetic blow-out unit is located on the moving contact side and generates a magnetic field to drive the arc movement. The stationary guide unit is electrically connected to the stationary contact and is arranged along its arc development path to guide the arc root on the stationary contact side. The moving guide unit is located below the swing path of the moving contact and includes an arc-initiating plate with a guide structure to provide a smooth path for the arc on the moving contact side toward the arc-extinguishing chamber. The spatial positions of the magnetic blow-out unit and the moving guide unit are coordinated to jointly guide the arc column on the moving contact side. The stationary guide unit independently guides the arc on the stationary contact side. All units work together to achieve the introduction and extinguishing of the arc into the arc-extinguishing chamber.

2. The high breaking miniature circuit breaker according to claim 1, characterized in that: The magnetic blowout unit includes a U-shaped gas-generating plate and two magnetic guide plates. The two magnetic guide plates are respectively embedded on the outer walls of both sides of the U-shaped gas-generating plate. The inner cavity of the U-shaped gas-generating plate forms a magnetic blowout groove that matches the movement trajectory of the moving contact.

3. The high breaking miniature circuit breaker according to claim 2, characterized in that: The housing is provided with a limiting groove that matches the shape of the U-shaped gas generating plate, and the U-shaped gas generating plate is engaged and fixed in the limiting groove.

4. The high interrupting miniature circuit breaker of claim 1, wherein: The stationary guide unit includes an arc-starting angle integrally formed with the stationary contact, and a magnetic conductor coupled to the magnetic circuit of the arc-starting angle; the tip of the arc-starting angle extends into the entrance of the outermost arc-extinguishing grid plate of the arc-extinguishing chamber.

5. The high interrupting miniature circuit breaker of claim 4, wherein: One end of the magnetic conductor has a fitting portion that fits against the inner wall of the arc-inducing angle. A punching hole is provided on the stationary contact head below the stationary contact point. An arc-inducing portion protrudes below the stationary contact point inside the punching hole. The tail of the fitting portion passes through the punching hole and abuts against the arc-inducing portion. The other end of the magnetic conductor has an arc-guiding portion extending above the arc-extinguishing chamber.

6. The high breaking capacity miniature circuit breaker according to claim 5, characterized in that: The housing contains A limiting post is provided, and a clamping groove for clamping and fixing the fitting part is formed between the arc-drawing angle and the limiting post.

7. The high interrupting miniature circuit breaker of claim 1, wherein: The guide structure is a series of raised arc-starting strips stamped onto the arc-starting plate.

8. The high breaking miniature circuit breaker according to claim 7, characterized in that: The starting end of the arc-initiating protrusion is adjacent to the initial separation position of the moving and stationary contacts, and its end is smoothly connected to the entrance of the arc-extinguishing chamber, forming a continuous arc-guiding surface.

9. The high breaking miniature circuit breaker according to any of the claims 1-8, characterized in that: The synergistic effect of the arc guiding system is as follows: when the arc is broken, the magnetic force generated by the magnetic blow unit pushes the arc towards the moving side guide unit; the guiding structure of the moving side guide unit receives and guides the arc to move along a smooth path; at the same time, the stationary side guide unit guides the root of the arc on the stationary contact side to the arc extinguishing chamber; the cooperation of each unit ensures that the arc is stretched as a whole and introduced into the arc extinguishing grid of the arc extinguishing chamber.

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