Gas Circuit Breaker Link Mechanism Angle Optimization
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Solution Overview
Problem
Conventional gas circuit breakers face issues with low operating speed due to component forces and bending stresses in the rods, leading to increased weight and costs, as a result of using large-scaled operating mechanisms to amplify displacement and transfer operating forces.
Innovation Solution
The design incorporates a support link initial angle between 2 degrees to 0 degrees, reducing the vertical force and bending stress on the seal rod, allowing for a compact and lightweight structure with a smaller sectional area, and optionally using a guide roller to minimize frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a large-scaled operating mechanism is used to amplify displacement and transfer operating forces, then the operating speed of the rods is improved, but the weight and cost of the entire gas circuit breaker increase
Solution Approach 1:
The patent changes the geometric parameters of the link mechanism, specifically setting the initial angle of the support link between -2 degrees to 0 degrees relative to the operating axial line. This parameter optimization reduces the vertical component force from 40-60% to less than 10% of the operating force, thereby reducing bending stresses and allowing for lighter rod sections while maintaining operating speed
Solution Approach 2:
The patent introduces a guide roller mechanism that converts the sliding support of the rod into a rolling contact system. This dynamic change reduces frictional forces during rod movement, improving operating speed without requiring heavier rods or a larger operating mechanism
2Strength
If the sectional area of the rods is increased to avoid deformation, then the mechanical strength is improved, but the weight increases and operating speed decreases
Solution Approach 1:
By optimizing the initial angle parameter of the support link, the patent reduces bending stresses to less than 10% of the operating force. This allows the use of rods with smaller sectional areas that have lower weight, thereby improving operating speed while maintaining sufficient mechanical strength through stress reduction rather than size increase
3Length of moving object
If the combination of rotatable links and linearly movable rods is used to transfer operating force, then the displacement amplification is achieved, but component forces generate frictional forces that reduce operating speed
Solution Approach 1:
The patent optimizes the initial angle parameter of the support link to minimize the vertical component force. By setting the angle between -2 degrees to 0 degrees, the vertical force component is reduced to less than 10% of the operating force, significantly reducing frictional forces at the sliding interface and improving operating speed while maintaining displacement amplification
Solution Approach 2:
The patent introduces a guide roller that transforms the sliding contact into a rolling contact system. This dynamic modification reduces frictional forces during rod movement, enabling faster operation while maintaining the displacement amplification function of the link mechanism
Data Source
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AI summary
A gas circuit breaker includes movable and fixed electrode parts arranged to face each other and engaging/separating manner in a container filled with an insulating gas, an operating mechanism attached to a partition of the container and configured to output an operating force to the movable electrode part, an operating rod attached to the movable electrode part, a first link rotatably attached to the operating rod, a lever rotatably attached to the first link, a support bearing fixed to the partition of the container via an insulating spacer, a second link rotatably attached to the lever and also rotatably attached to the support bearing, a seal bearing connected through the partition of the container, a seal rod rotatably attached to the center of the lever and slidably supported to the seal bearing, and a third link rotatably attached to the seal rod and also attached to the operating mechanism.