A vacuum interrupter with moving main contacts and moving arc contacts

Abstract

The invention relates to a vacuum arc-extinguishing chamber with a movable main contact and a movable arc contact. The vacuum arc-extinguishing chamber comprises a shell, a shielding case arranged inside the shell, a fixed contact assembly and a movable contact assembly, wherein the fixed contact assembly and the movable contact assembly are arranged oppositely; the fixed contact assembly comprises a fixed conductive rod and a fixed contact, wherein the fixed conductive rod is inserted into the shell, the bottom end of the fixed conductive rod is located inside the shielding case, and the fixed contact is arranged at the bottom end of the fixed conductive rod; the movable contact assembly comprises a movable conductive rod, the movable main contact and the movable arc contact, wherein the movable conductive rod is inserted into the shell, the top end of the movable conductive rod is located inside the shielding case, the movable main contact is arranged at the top end of the movable conductive rod, the movable conductive rod and the movable main contact are sleeved with the movable arc contact, the movable arc contact can reciprocate in the axial direction of the movable conductive rod, and the movable arc contact is in sliding connection with the movable conductive rod through a watchband contact finger. Compared with the prior art, the movable main contact and the fixed contact jointly undertake a task for carrying rated current, the movable arc contact and the fixed contact jointly undertake a task for disconnecting short-circuit current, the contact resistance between the movable arc contact and the movable conductive rod is decreased through the watchband contact finger, and the comprehensive performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of electrical components and relates to a vacuum interrupter with a moving main contact and a moving arc contact. Background technique [0002] Vacuum circuit breaker is named for its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are high vacuum. It has the advantages of small size, light weight, suitable for frequent operation, and no maintenance for arc extinguishing. It is used in distribution network The application is universal. Most of the vacuum interrupters of existing vacuum circuit breakers are provided with a moving contact and a static contact, and the breaking of the short-circuit current and the bearing of the rated current are both completed by the pair of contacts. The biggest disadvantage of the vacuum interrupter with this structure is that it cannot have both the breaking capacity of large short-circuit current and the carrying capacity of l...

AI Technical Summary

Problems solved by technology

The technical solution disclosed in the above patent has a good ability to break current, but its structure is complex and difficult to process, and there are many parts in the radial direction of the circuit breaker, which increases the radial size of the circuit breaker and makes the outer diameter of the circuit breaker larger , which limits the scope of application of the circuit breaker

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