Gas Circuit Breaker Insulation Rod Cover Hot Gas Blocking
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Solution Overview
Problem
Gas circuit breakers face insulation performance degradation due to high-temperature hot gases contaminating the insulating rod and cylinder, leading to potential ground faults and reduced circuit-breaking efficiency, especially with existing designs requiring significant size and rigidity for effective hot gas blocking.
Innovation Solution
A gas circuit breaker design incorporating a hot gas blocking member at the joint between the puffer shaft and insulation rod, utilizing a PTFE insulation rod cover to prevent hot gas infiltration and particle sticking, ensuring smooth operation and improved insulation and circuit-breaking performance with a lighter structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a piston ring is used to completely block the gap between the exhaust cylinder and shaft guide, then hot gas blocking performance is improved, but sliding resistance increases and structure becomes more complex
Solution Approach 1:
The invention extracts the hot gas blocking function from the piston ring-sealed gap blocking approach and relocates it to a dedicated hot gas blocking member positioned at the joint between the puffer shaft and insulation rod. This separates the blocking function from the sliding seal function, allowing the piston ring to only seal the gap without needing to completely block hot gas, thereby reducing sliding resistance and structural complexity.
Solution Approach 2:
The invention introduces a dedicated hot gas blocking member as an intermediary component between the puffer shaft and insulation rod. This blocking member acts as a barrier that prevents hot gas from reaching the insulation rod, while the piston ring continues to seal the gap between the shaft guide and exhaust cylinder without bearing the additional burden of complete hot gas blocking, thus reducing friction and complexity.
2Object-affected harmful factors
If the shaft guide has an outer diameter approximately equal to the inner diameter of the exhaust cylinder, then hot gas blocking is improved, but size and rigidity requirements increase
Solution Approach 1:
The invention segments the hot gas blocking function from the structural support function. By introducing a dedicated hot gas blocking member at the joint between the puffer shaft and insulation rod, the shaft guide no longer needs to be tightly fitted to the exhaust cylinder to block hot gas. This allows the shaft guide to have a larger clearance from the exhaust cylinder, reducing its size and rigidity requirements while still effectively blocking hot gas through the separate blocking member.
3Object-affected harmful factors
If the piston ring directly contacts the inner surface of the exhaust cylinder, then hot gas blocking is improved, but sliding resistance and wear increase
Solution Approach 1:
The invention extracts the hot gas blocking function from the piston ring's contact surface and transfers it to a dedicated hot gas blocking member. The piston ring is now only responsible for sealing the radial gap between the shaft guide and exhaust cylinder, which significantly reduces its sliding resistance and wear compared to simultaneously blocking hot gas and sealing the gap.
Solution Approach 2:
The hot gas blocking member serves as an intermediary barrier that prevents hot gas from contacting the piston ring's sliding surface. This allows the piston ring to slide against the exhaust cylinder inner surface with reduced thermal exposure and lower sliding resistance, while the blocking member absorbs the thermal and chemical exposure from the hot gas.
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 solution effectively prevents hot gas contamination and particle sticking, enhancing insulation and circuit-breaking performance while maintaining a simpler and lighter structure, thereby improving reliability and reducing the risk of ground faults.
Implementation Method 1
a hot gas blocking member at a joint between the puffer shaft and the insulation rod
Implementation Method 2
utilizing a PTFE insulation rod cover to prevent hot gas infiltration and particle sticking
Implementation Method 3
The extinguishing gas passing through the gas passage of the puffer shaft is heated by the arc
Data Source
AI summary
An insulation rod cover is fitted to an end portion of a puffer shaft and the insulation rod cover is fitted to a circuit-breaker side coupling pin coupling between a puffer shaft and an insulation rod, thereby allowing the insulation rod cover to be held at a joint between the puffer shaft and the insulation rod. In a first half of a circuit-breaking operation, the insulation rod cover is positioned in the exhaust cylinder and the exhaust of the hot gas from the puffer shaft is suppressed to increase the pressure of an extinguishing gas to be sprayed onto the arc. In a last half of the circuit-breaking operation, the insulation rod cover is positioned in a guard cylinder to promote the exhaust of the hot gas from the puffer shaft as well as to suppress the flow of the hot gas into the insulation cylinder.