Moving Contact Spring Mechanism to Prevent Breaker Rebound
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Solution Overview
Problem
Existing circuit breakers face issues with unreliable contact connection due to varying electric repulsion forces, leading to rapid current decrease and potential secondary switching-on, which can cause damage.
Innovation Solution
A moving contact mechanism with a contact spring that rotates around a third axis, using an electric repulsion force to maintain the moving contact in a locked position, ensuring reliable breaking and preventing rebound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamping block with positioning shaft is used to lock the contact body, then the contact can be prevented from rebounding, but the structure becomes complex and the reliability decreases due to secondary switching-on
Solution Approach 1:
The invention extracts the essential locking function from the complex clamping block and positioning shaft mechanism, replacing it with a simplified contact spring system that achieves reliable contact maintenance without the need for separate locking components
Solution Approach 2:
The contact spring is designed to automatically maintain contact pressure and provide self-locking functionality through its elastic deformation characteristics, eliminating the need for external locking mechanisms and achieving self-service operation
2Speed
If the moving contact is allowed to rotate freely under electric repulsion force, then the contact can separate quickly to break the circuit, but the contact may fall back and cause secondary switching-on
Solution Approach 1:
The contact spring applies preliminary counteracting force to the electric repulsion force, creating a controlled separation process that prevents the moving contact from falling back while maintaining fast breaking speed through the balance of elastic and electric forces
3Reliability
If the contact pressure is increased to ensure reliable connection, then the contact connection is more stable, but the electric repulsion force can more easily overcome it causing contact separation
Solution Approach 1:
The contact spring provides dynamic contact pressure that automatically adjusts during operation - maintaining high pressure for stable connection while allowing controlled release when electric repulsion force exceeds the threshold, achieving both stability and responsiveness to fault conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mechanism ensures reliable release and locking of the moving contact, preventing rebound and ensuring stable contact breaking, thus preventing secondary switching-on and reducing damage.
Implementation Method 1
both ends of the spring are a third end of the spring and a fourth end of the spring, respectively, the third end of the spring being rotatably connected to the moving contact, the fourth end of the spring being rotatably connected to the contact support
Implementation Method 2
the moving contact rotates relative to the contact support when the moving contact is repelled by an electric repulsion force generated by a short-circuit current
Data Source
AI summary
A moving contact mechanism with a contact support that rotates around a third axis, a moving contact pivotable around a contact axis, and both ends of the contact spring are a third end of the spring and a fourth end of the spring, respectively, which are rotatably connected to the moving contact and the contact support respectively. A geometric axis of the contact spring is a second axis line located on one side of the third axis when the moving contact is normally on or off. The contact spring keeps the moving contact in an on or off state. The moving contact rotates relative to the contact support when repelled, drives the contact spring to rotate around the fourth end of the spring, so that the second axis line swings to the other side of the third axis, and remains in a temporary breaking position.