Arc extinguishing chamber structure of circuit breaker

Abstract

An arc extinguishing chamber structure of a circuit breaker belongs to the technical field of low-voltage electric appliances. The circuit breaker comprises a contact mechanism. The arc extinguishingchamber structure comprises: a first arc extinguishing grid sheet group which is composed of a plurality of longitudinal arc extinguishing grid sheets which are stacked at intervals in a transverse state; and a second arc extinguishing grid sheet group, wherein the second arc extinguishing grid sheet group is composed of a plurality of transverse arc extinguishing grid sheets which are stacked atintervals in a longitudinal state, one end of the first arc extinguishing grid sheet group and one end of the second arc extinguishing grid sheet group are adjacent to each other and form a font relation. The area of the junction of the first arc extinguishing grid sheet group and the second arc extinguishing grid sheet group forms an adjacent part, an arc striking device is arranged at the position corresponding to the adjacent part, is used for connecting electric arcs entering the first arc extinguishing grid sheet group and the second arc extinguishing grid sheet group and comprises a first arc striking piece and a second arc striking piece which extend towards the direction of the contact mechanism respectively, and the first arc striking piece and the second arc striking piece are arranged at intervals. The good breaking capacity of the circuit breaker is embodied, manufacturing and assembling are facilitated, the ideal reliability of lengthening the arc for cutting the arc extinguishing grid pieces is guaranteed, and the electrical endurance performance is improved.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an arc extinguishing chamber structure of a circuit breaker. Background technique [0002] As known in the industry, a circuit breaker is usually configured in a power supply and distribution network, and the circuit breaker plays a role of limiting or disconnecting a fault current in the power supply and distribution network. For example, when there is a large fault current such as caused by overload or short circuit in the circuit, the metal contacts set as contact pairs (also called contact pairs) in the circuit breaker are separated from each other, and a fault occurs between the two opposite contact pairs. The arc is cut by the arc extinguishing grid set in the structural system of the arc extinguishing chamber in the circuit breaker, so that the arc can be quickly or instantaneously extinguished within the desired time, so as to avoid t...

AI Technical Summary

Problems solved by technology

Although this structure increases the number of arc extinguishing grids, because the junction of the two sets of arc extinguishing grids is relatively far away from the opening track of the moving guide rod, the arc generated during the opening process of the moving guide rod is often difficult. To achieve the purpose of dividing the aforementioned junction by the arc extinguishing grid and increasing the arc voltage, it is not enough to reflect the expected breaking capacity and electrical life performance of the circuit breaker

Images