Arc-extinguishing device with gas-evolving hoods for short-circuit current
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Solution Overview
Problem
Existing circuit breakers often fail to effectively extinguish electric arcs during short-circuiting due to the lack of cooperation between the arc-extinguishing system and the contact system, leading to potential burnout from strong short-circuit currents.
Innovation Solution
An arc-extinguishing device with an arc-extinguishing chamber featuring arc-extinguishing grid sheets, gas-evolving hoods, and a magnetic conducting block, which gathers and increases arc voltage by creating a magnetic blow force and gas blow force to direct electric arcs into the arc-extinguishing chamber, enhancing the circuit breaker's ability to disconnect short-circuit currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arc-extinguishing system and contact system work independently in existing circuit breakers, then the structure is simpler, but the arc-extinguishing performance deteriorates under short-circuit conditions
Solution Approach 1:
The patent combines the arc-extinguishing system and contact system into an integrated arc-extinguishing device where the contact point is positioned within the arc-extinguishing chamber. The extension legs of the arc-extinguishing grid sheet cooperate with the moving contact to guide and extinguish arcs, creating a unified system that improves arc-extinguishing performance without requiring separate independent mechanisms.
2Reliability
If the front edge of the wrapping surface is aligned with or beyond the front end of the moving contact, then the gas-evolving function is enhanced and arc voltage increases, but the device structure becomes more complex
Solution Approach 1:
The gas-evolving hood is designed with a specific local configuration where the front edge of the wrapping surface is positioned to align with or extend beyond the front end of the moving contact. This localized structural feature creates an effective gas-evolving function that increases arc voltage and improves disconnection capability, while the rest of the structure remains relatively simple.
3Reliability
If arc-extinguishing grid sheets have extension legs wrapped by gas-evolving hoods, then electric arcs are better gathered and extinguished, but the manufacturing complexity increases
Solution Approach 1:
The arc-extinguishing grid sheet is segmented into extension legs that can be separately wrapped by the gas-evolving hood. This segmentation allows the extension legs to be positioned to effectively gather electric arcs, while the modular structure facilitates assembly and manufacturing by allowing components to be prepared and assembled in stages.
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 gathers and extinguishes electric arcs, increasing arc voltage to facilitate successful disconnection of short-circuit currents, thereby improving the circuit breaker's performance and preventing burnout.
Implementation Method 1
a first gas-evolving hood, and a second gas-evolving hood; an end and an inner side of the first extension leg are wrapped by the first gas-evolving hood, and an end and an inner side of the second extension leg are wrapped by the second gas-evolving hood
Implementation Method 2
which gathers and increases arc voltage by creating a magnetic blow force and gas blow force to direct electric arcs into the arc-extinguishing chamber
Implementation Method 3
in a case of short-circuiting, electric arcs can be gathered to increase an arc voltage, thereby helping the circuit breaker to disconnect a short circuit current
Data Source
AI summary
The present invention provides an arc-extinguishing device, including an arc-extinguishing chamber, where the arc-extinguishing chamber includes a support, a plurality of arc-extinguishing grid sheets, a first gas-evolving hood, and a second gas-evolving hood; the plurality of arc-extinguishing grid sheets are mounted on the supports, the arc-extinguishing grid sheet has a groove to form a moving track for a moving contact, both sides of the groove extend toward the moving contact respectively to form a first extension leg and a second extension leg, an end and an inner side of the first extension leg are wrapped by the first gas-evolving hood, and an end and an inner side of the second extension leg are wrapped by the second gas-evolving hood; a surface of the gas-evolving hood extending along the inner side of the extension leg toward the groove is referred to as a wrapping surface.