Circuit Breaker Linkage Layout for Larger Arc-Extinguishing Chambers
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Solution Overview
Problem
Traditional molded case circuit breakers face challenges in increasing arc voltage and arc-extinguishing performance due to limited space and structural design, which hinders the accommodation of more arc-extinguishing grids and lacks auxiliary structures to accelerate electric arcs.
Innovation Solution
An operating mechanism with a phase-pole shaft and N-pole rotating shaft rotating around different centers, utilizing a four-link structure with synchronized rotation, allowing for independent operation and modular assembly, and a slider for precise parameter adjustment, enabling a more flexible design and layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the operating mechanism uses a traditional four-link or five-link conversion structure with vertically aligned rotation centers, then the structure is compact, but the arc-extinguishing chamber volume cannot be increased significantly and more arc-extinguishing grids cannot be accommodated
Solution Approach 1:
The patent changes the spatial arrangement from vertical alignment to horizontal arrangement of rotation centers. The phase-pole rotating shaft and N-pole rotating shaft are arranged side by side horizontally, allowing the arc-extinguishing chamber to be positioned above the rotating shaft mechanism, thereby increasing the chamber volume and accommodating more arc-extinguishing grids.
2Reliability
If the opening distance between moving contact and static contact is increased, then the breaking performance is improved, but the correlation between links makes it inconvenient to adjust by changing mating sizes
Solution Approach 1:
The patent introduces a movable connection between the first link and the slider, replacing fixed mating sizes with adjustable positioning. The first link can be positioned at different locations on the slider, allowing the opening distance to be adjusted by changing the connection position rather than changing the entire link assembly, thus improving both breaking performance and adjustability.
3Ease of manufacture
If the arc-extinguishing chamber structure is simplified, then manufacturing is easier, but the arc-extinguishing performance deteriorates
Solution Approach 1:
The patent segments the arc-extinguishing chamber into multiple independent grid units arranged in series. Each grid unit is a simple, easy-to-manufacture component, but when combined in sequence, they collectively provide enhanced arc-extinguishing performance through increased surface area and extended arc path length.
4Adaptability or versatility
If the operating mechanism layout is fixed with vertically aligned rotation centers, then the design is straightforward, but auxiliary structures to accelerate electric arcs cannot be added
Solution Approach 1:
The patent transitions from vertical to horizontal arrangement of rotation centers, creating additional spatial dimensions for component placement. This allows auxiliary structures such as arc accelerators and improved arc-extinguishing grids to be integrated into the design without interfering with the operating mechanism's core functionality.
Data Source
AI summary
The present invention relates to the field of low-voltage electrical appliances, and more particularly to an operating mechanism of a circuit breaker. The operating mechanism is provided with two sets of four-link structures. Each set of four-link structures is composed of a second crank, a third link and a third crank. The third crank and the phase-pole rotating shaft have the same rotation center and are in driving connection with each other. The other set of four-link structures is composed of a second crank, a fourth link and an N-pole rotating shaft, so that the phase-pole rotating shaft and the N-pole rotating shaft can be arranged around different rotation centers, so as to provide more convenience for the design of the circuit breaker.