Rotary Dual Breakpoint Moving Contact Module for Circuit Breakers
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Solution Overview
Problem
Conventional rotary dual breakpoint moving contact structures in molded case circuit breakers face challenges in balancing contact pressure and preventing rebound, with complex assembly procedures and potential sliding friction issues.
Innovation Solution
A rotary dual breakpoint moving contact module featuring a rod-shaped block rotor with symmetric linkage holes and semicircle slot holes, a contact bridge with centrally symmetric profiles, and connection members that limit rotation, ensuring balanced contact pressure and preventing rebound through electrodynamic repulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a slide block mechanism is used in the rotary dual breakpoint structure, then the moving contact can be actuated, but sliding friction occurs which influences moving flexibility
Solution Approach 1:
The patent replaces the slide block mechanism with a connection member mechanism that eliminates sliding friction. The connection members (including the rod-shaped block rotor) directly connect the moving contact to the actuating mechanism through a different mechanical arrangement that avoids sliding contact, thereby maintaining moving flexibility while eliminating the harmful friction effect.
2Adaptability or versatility
If the rod-shaped block rotor has a plurality of assembly holes, then the structure can accommodate multiple components, but the assemble procedure complexity increases
Solution Approach 1:
The patent consolidates multiple assembly functions into fewer integrated features on the rod-shaped block rotor. Instead of having separate assembly holes for different components, the design merges the positioning and assembly functions into a reduced set of holes that accommodate multiple components simultaneously, thereby reducing assembly procedure complexity while maintaining the ability to accommodate necessary components.
3Reliability
If additional functions are added to prevent contact rebound, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent implements contact rebound prevention through the inherent mechanical characteristics of the connection member mechanism itself, rather than adding separate dedicated rebound prevention components. The electrodynamic repulsion force and the mechanical arrangement of the connection members work together to automatically prevent rebound, allowing the system to serve its own reliability needs without increasing overall structural complexity.
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
Enables quick opening and balanced contact pressure for large current short circuit breaking, preventing moving contact rebound and reducing assembly complexity.
Implementation Method 1
When a contact bridge is opened to a relatively small angle by electrodynamic repulsion force, the apparatus may quickly lock the contact bridge at a limit position of a clearance distance of open contacts.
Data Source
Figure 1a~1e
Figure 2a~2b
Figure 3a~3d
AI summary
The present invention discloses a rotary dual breakpoint moving contact module. The rotary dual breakpoint moving contact module comprises a rod-shaped block rotor, a first connection member, a second connection member and a contact bridge. The rod-shaped block rotor is single phase independent. The rod-shaped block rotor has a first through hole at the center, a first shaft is mounted in the first through hole. The rod-shaped block rotor has a first recess on each axial side face, a contact spring is mounted in each first recess and is able to move within a range defined by the first recess. The first connection member is mounted on the rod-shaped block rotor, a second shaft goes through the first connection member. The second shaft and a third shaft goes through the second connection member respectively. The contact bridge crosses through the rod-shaped block rotor, the outer profile of the contact bridge is centrally symmetric, the first shaft and the third shaft go through the contact bridge respectively. Contacts are welded to the end points on both sides of the contact bridge. The rotary dual breakpoint moving contact module of the present invention may realize large current short circuit breaking of rotary dual breakpoint moving contacts, the moving contacts may open quickly and rebound of the moving contacts is prevented, the contact pressure on two contact points is balanced.