Arc Extinguishing Chamber Pressure Balancing for Bellows Durability
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Solution Overview
Problem
The durability of the bellows in vacuum circuit breakers is compromised due to repeated extension and contraction caused by large pressure differences between the vacuum container and the bellows, leading to central bulging and reduced durability.
Innovation Solution
The arc extinguishing chamber maintains an air pressure of atmospheric pressure in the closed state and less than atmospheric pressure in the open state within the sealed space surrounded by the bellows, contact case, and movable-side support, reducing the pressure difference and enhancing bellows durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the air pressure in the space inside the bellows is constantly atmospheric pressure, then the bellows can extend and contract smoothly, but the bellows repeats extension and contraction in a centrally bulging state, reducing durability
Solution Approach 1:
The patent applies dynamics by making the air pressure inside the bellows variable rather than constant. The air pressure dynamically changes between atmospheric pressure in the open state and negative pressure in the closed state, allowing the bellows to adapt its internal pressure to match external conditions and prevent central bulging during operation cycles
Solution Approach 2:
The patent changes the physical parameter of air pressure inside the bellows based on the operational state. By transitioning the pressure parameter from atmospheric to negative pressure when the circuit breaker moves from open to closed state, the patent eliminates the pressure differential that causes central bulging, thereby improving bellows durability while maintaining operational functionality
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
This configuration results in improved durability of the bellows by minimizing central bulging and maintaining air pressure within acceptable limits, thereby extending the lifespan of the bellows.
Implementation Method 1
a bellows that connects the vacuum container and the movable lead to each other, extends in a closed state, and contracts in an open state
Implementation Method 2
a seal rod that is connected to the movable lead and moves the movable lead; and a movable-side support having a cylinder shape with a bottom surface in which a hole through which the seal rod passes is formed
Data Source
AI summary
An arc extinguishing chamber includes: a vacuum interrupter including a bellows; a contact case having a tubular shape and made of a conductive material; a contact fixed to an end of a movable lead, disposed inside a tube of the contact case, and electrically connecting the contact case and the movable lead to each other; a seal rod that is connected to the movable lead and moves the movable lead; and a movable-side support having a cylinder shape with a bottom surface in which a hole through which the seal rod passes is formed. An air pressure inside a closed space surrounded and sealed by the bellows, the contact case, and the movable-side support is atmospheric pressure in an open state, and is less than atmospheric pressure in a closed state.