Ceramic-Coated Arc Guide for Circuit Breaker Insulation
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Solution Overview
Problem
Conventional circuit breakers with arc guides made of fiber-reinforced plastic experience weakened insulation performance due to ionization of glass fibers when an arc is generated, leading to potential damage and reduced heat resistance.
Innovation Solution
The arc extinguishing assembly uses a polyamide resin or ceramic material for the arc guide, which is designed with extension portions and coated with a ceramic layer to enhance heat resistance and prevent insulation deterioration, ensuring stable performance even under high-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If glass fiber is included as the material of the arc guide, then heat resistance and strength are improved, but insulation performance is weakened due to ionization of glass fibers
Solution Approach 1:
The patent removes glass fibers from the arc guide material composition to eliminate the ionization problem. The arc guide is made of pure plastic material without glass fiber reinforcement, thereby preventing insulation deterioration while maintaining structural integrity through alternative design approaches.
Solution Approach 2:
The patent changes the material composition parameter by eliminating glass fiber content from the arc guide. This parameter change resolves the contradiction by removing the source of ionization while maintaining heat resistance through the plastic material's inherent properties and appropriate geometric design.
2Strength
If a plastic composite material with glass fiber is used for the arc guide, then mechanical strength is improved, but insulation performance deteriorates when arc is generated
Solution Approach 1:
The patent extracts and removes the glass fiber component from the composite material. The arc guide is manufactured using pure plastic material without any glass fiber reinforcement, thereby eliminating the ionization issue while maintaining adequate mechanical strength through the plastic material selection and structural design.
3Temperature
If the arc guide is exposed to high-temperature environment continuously, then heat resistance is tested, but insulation performance becomes unstable
Solution Approach 1:
The patent removes glass fibers from the arc guide material to prevent ionization under continuous high-temperature exposure. This extraction eliminates the source of performance instability while the pure plastic material maintains stable insulation properties even in high-temperature environments.
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 increases the arc's extension speed and ensures reliable insulation, reducing arc duration and improving current breaking performance, while maintaining mechanical properties and durability.
Implementation Method 1
the arc generated when the current is blocked causes a phenomenon in which the glass fiber is ionized between the arc guide
Implementation Method 2
the arc guide may be made of a material having heat resistance
Data Source
AI summary
The present disclosure relates to an arc extinguishing assembly, including side members which are spaced apart by a certain distance and disposed to face each other; an exhaust which is installed at an upper part of the side member; a plurality of grids which are installed between the side members and having both ends fixed to each of the side members; and an arc guide whose one side is coupled to the side member and which is installed at a lower part of the plurality of grids, wherein the arc guide is made of a material having heat resistance, and a circuit breaker including the same.