Contact mechanism in four-breakpoint contactor

Abstract

The invention discloses a contact mechanism in a four-breakpoint contactor. The contact mechanism comprises a moving contact structure, a static contact structure and an arc extinguishing structure; the moving contact structure comprises a first moving contact, a second moving contact, a moving contact support, two overtravel springs, three clamp springs, two guide rods and a connection rod, the moving contact support is arranged on the top of the connection rod in a sleeving mode through one of the clamp springs and provided with a first end and a second end, and the two guide rods are vertically arranged at the first end and the second end of the moving contact support respectively; the static contact structure comprises a first static contact, a second static contact, a third static contact, a fourth static contact, a conducting plate and a ceramic base, four hollow holes are formed in the ceramic base, the bottoms of the first static contact, the second static contact, the third static contact and the fourth static contact are each provided with a static contact point which is exposed out through one hollow hole, and the tops of the first static contact and the second static contact are connected through the conducting plate; and the arc extinguishing structure comprises four permanent magnets and two permanent magnet pressing plates which are each in the shape shown in thespecification and are arranged at the periphery of the ceramic base in an enclosing mode.

Description

technical field [0001] The present invention relates to the technical field of contactors, in particular, to a contact mechanism in a four-breakpoint contactor. Background technique [0002] Contactors are widely used in industrial control systems. In order to ensure long-term and reliable operation of control circuits, it is very important to study the electrical life of contactors. In order to improve the electrical life of the contactor, it is necessary to improve its arc extinguishing ability, shorten the arcing time and reduce the contact ablation. At present, most of the contactors are of ordinary double-breakpoint structure. In the case of a certain contact distance, this contact method forms two arcs in series, that is, there are only four voltage drops near the pole and two voltage drops in the arc column area. , so that the total arc voltage is relatively low, which is not conducive to arc extinguishing. Therefore, the contact method of the double-breakpoint struc...

AI Technical Summary

Problems solved by technology

At present, most of the contactors are ordinary double-break point structure. Under the condition of a certain contact distance, this contact method forms two arcs in series, that is, there are only 4 side voltage drops and 2 arc column voltage drops. , so that the total arc voltage is relatively low, which is not conducive to arc extinguishing. Therefore, the contact method with double breakpoint structure has a longer arcing time, more serious ablation of the contacts, and shorter electrical life.

In addition, the voltage and current level that can be broken by the contact method of the double break point structure is low, and the withstand voltage capacity needs to be improved

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