Linkage Arc Cover for Air Circuit Breaker Arc Gas Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The insertion/withdrawal type air circuit breakers in existing technologies suffer from a gap between the arc extinguishing part and the arc cover, leading to a risk of secondary short-circuit accidents due to metal gas leakage.
Innovation Solution
An air circuit breaker with an insertion/withdrawal linkage type arc cover is designed such that the main body is separate from the arc extinguishing part before assembly, and is lowered to come into close contact with the arc extinguishing part when assembled, effectively sealing metal gas and preventing secondary short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the arc cover is assembled in the cradle not to interfere with insertion or withdrawal of the main body, then the ease of operation is improved, but the reliability deteriorates due to gap between arc extinguishing part and arc cover causing metal gas leakage
Solution Approach 1:
The arc cover is designed to be movable rather than fixed, allowing it to dynamically adjust its position. During insertion/withdrawal operations, the arc cover can be raised to clear the main body path. During normal operation, it lowers to seal the arc extinguishing part, thus resolving the contradiction between operational ease and sealing reliability
Solution Approach 2:
The arc cover mechanism is segmented into movable and stationary parts, with the arc cover itself being movable while the cradle remains stationary. This segmentation allows the arc cover to independently perform both sealing and non-interference functions at different times
2Reliability
If the arc cover is positioned to be in close contact with the arc extinguishing part, then the reliability is improved by preventing metal gas leakage, but the ease of operation deteriorates due to interference with insertion or withdrawal of the main body
Solution Approach 1:
The arc cover transitions between two dynamic states: raised position during insertion/withdrawal to avoid interference, and lowered position during operation to ensure sealing contact with the arc extinguishing part, thus maintaining both reliability and operational ease
3Manufacturing precision
If the main body is integrated with the arc extinguishing part, then the manufacturing precision is improved, but the ease of repair deteriorates as maintenance requires separation of circuit and control circuits
Solution Approach 1:
The circuit breaker is segmented into a main body and a separate arc extinguishing part housed in the cradle. This segmentation allows the arc extinguishing part to be independently maintained or replaced without disconnecting circuit connections, thus improving ease of repair while maintaining functional integration
Data Source
AI summary
Disclosed is an air circuit breaker having an insertion/withdrawal linkage type arc cover, the circuit breaker having an arc cover coming into close contact with an arc chute when a main body is inserted into a cradle, thereby preventing a secondary shorting accident of a terminal. The air circuit breaker according to one aspect of the present disclosure comprises: a main body having a plurality of contacts and a plurality of terminals; a cradle into/from which the main body is inserted/withdrawn, and which includes a plurality of terminals correspondingly connected to the plurality of terminals of the main body; a control module which is raised on the cradle, and which is coupled to a coupling module provided at the main body during lowering, so as to electrically connect the main body to the cradle; and an insertion/withdrawal linkage type arc cover which is provided at the cradle so as to be raised together with the control module, and which is lowered when the main body is coupled to the cradle, so as to come into close contact with the upper part of an arc extinguishing part of the main body and cover same.