Integrated contact arc extinguishing system with movable fixed contact

Abstract

The invention discloses an integrated contact arc extinguishing system with movable fixed contact, which is used for a moulded case low voltage circuit breaker and comprises a movable fixed contact, a conductive copper bar, an arc extinguishing grid group and insulated casings, wherein the insulated casings are positioned at two sides of the conductive copper bar and between two sides of the movable fixed contact, the movable fixed contact is arranged between two reversed-U-shaped sides of the conductive copper bar, and a pin shaft is connected with the conductive copper bar and the movable fixed contact in a penetrative way; two ends of a spring are fixed to two ends of the pin shaft and placed inside corresponding grooves on the movable fixed contact; the pin shaft is connected with themovable fixed contact in an interval-penetrative way, inner sides of the insulated casings are symmetrically provided with a limit groove respectively and two ends of the pin shaft are positioned inside the limit grooves; with the fixed contact being movable, the integrated contact arc extinguishing system enhances the speed of separating movable moving contact from movable fixed contact and improves the breaking ability of the circuit breaker; and with the arc extinguishing system being modularized, the airtightness of fixed contact arc extinguishing components is raised and the installationfor the arc extinguishing grid group is simplified.

Description

technical field [0001] The invention relates to a molded case low-voltage circuit breaker, in particular to a contact arc extinguishing system of the low-voltage circuit breaker. Background technique [0002] At present, the contact arc extinguishing parts of the molded case low-voltage circuit breaker are mainly composed of static contact parts and arc extinguishing parts. Among them, the static contact parts are all fixed, and the fixed static contacts are repelled by the movable contacts when the circuit breaker is broken. The disadvantages of this structure are: the moving contact is separated from the static contact at a slow speed, and the arc cannot be extinguished quickly, resulting in a low breaking capacity of the switch and a risk of burnout of the circuit breaker. Some movable static contacts are connected by braided wires, that is, soft connections to achieve movement. When the circuit breaker is broken, due to the large breaking current, the heat generated is...

AI Technical Summary

Problems solved by technology

The disadvantage of this structure is that the moving contact is separated from the static contact at a slow speed, and the arc cannot be extinguished quickly, resulting in a low breaking capacity of the switch and the risk of burning the circuit breaker.

[0003] Arc extinguishing parts are generally composed of several arc extinguishing grids and arc extinguishing parts for installing arc extinguishing grids, and the installation of arc extinguishing grids and arc extinguishing parts for installing arc extinguishing grids needs to go through many production processes, which is time-consuming Laborious, difficult to improve production efficiency

[0004] Since the traditional arc extinguishing chamber and contact system are relatively independent, after the installation of the contact arc extinguishing system is completed, the installation gap of the contact arc extinguishing system is large and the airtightness is poor

During the process from arc generation to arc movement to arc extinguishing grid extinguishing, due to the lack of airtightness, the speed of arc movement cannot be greatly improved, resulting in low breaking capacity of the circuit breaker

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