Insulating pull rod device and circuit breaker equipped with the same

By adding an additional buffer mechanism to the insulating tie rod device, the problem of excessive bounce during vacuum circuit breaker closing was solved, the life of the arc-extinguishing chamber was extended, the reliability of the operating mechanism was improved, contact wear and arc reignition were avoided, and successful closing was ensured.

CN224745642UActive Publication Date: 2026-09-11CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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Patent Information

Application Number
CN202522634390.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-12-12
Publication Date
2026-09-11
Estimated Expiration
2035-12-12

AI Technical Summary

Technical Problem

Existing vacuum circuit breakers have a problem with excessive closing bounce time during the closing process, which leads to a shortened life of the arc-extinguishing chamber and fatigue damage to the contact materials. Furthermore, existing measures such as adjusting the overtravel or replacing the spring configuration are inefficient and unreliable.

Method used

An additional buffer mechanism is added to the insulating tie rod device, including a bushing, an elastic element and an additional buffer mechanism. Through the synergistic effect of the elastic buffer head and the buffer flange, the rebound force during closing is absorbed, and the closing bounce is suppressed.

Benefits of technology

It significantly reduces the severe impact between moving and stationary contacts, extends the life of the arc-extinguishing chamber, ensures the reliability of the operating mechanism, avoids dangers such as arc reignition and contact welding, and improves the success rate of closing.

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Abstract

An insulating pull rod device and a circuit breaker equipped with the insulating pull rod device belong to the field of electrical equipment technology. It includes an insulating housing with a basic buffer mechanism connecting cavity at its left end and a fixed rod connecting hole at its right end; a fixed rod, with its left end connected to the insulating housing at a position corresponding to the fixed rod connecting hole, and its right end extending outside the fixed rod connecting hole and forming the moving contact connecting end of the circuit breaker; a basic buffer mechanism connected to the left end of the insulating housing and extending to the left outside the basic buffer mechanism connecting cavity; and, importantly, an additional buffer mechanism disposed within the basic buffer mechanism connecting cavity and connected to the basic buffer mechanism at the bottom of the cavity. The circuit breaker is equipped with the above-described insulating pull rod device. Advantages: ensures the service life of the arc-extinguishing chamber within a reasonable period; ensures the reliability of the operating mechanism's operation; and ensures successful closing.
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