Breaking Unit Arc Shield Layout for Screwless Gas Discharge
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Solution Overview
Problem
Traditional arc extinguishing chambers in electrical devices face issues with complex connections between the face cover and arc extinguishing shield, which can fail under high-pressure gas conditions, leading to potential short circuits and personal injury, and require materials with high insulation and temperature resistance.
Innovation Solution
A breaking unit design featuring a stationary contact, moving contact, arc extinguishing grids, and an arc extinguishing shield with integrated sections forming a gas passage, allowing gas to be cooled and discharged without direct exposure, and a detachable face cover that does not need to be securely fastened.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the face cover and arc extinguishing shield are connected through screws to strengthen connection, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The face cover is integrated with the arc extinguishing shield to form an integral structure, eliminating the need for separate connection components like screws. This merging of parts simplifies the connection structure while maintaining reliability, as the integrated design ensures proper alignment and connection without additional fastening elements.
2Reliability
If the face cover is made with high insulation and high temperature resistance materials to block gas, then safety is improved, but manufacturing cost increases
Solution Approach 1:
The gas-blocking function is extracted from the face cover and assigned to the arc extinguishing shield and arc extinguishing grid structure. This allows the face cover to be made from lower-cost materials without compromising safety, as the specialized high-performance materials are only used where they are strictly necessary for arc containment and gas blocking.
Solution Approach 2:
High insulation and temperature resistance materials are applied only to specific critical areas (the arc extinguishing shield and grid) rather than the entire face cover. This localized application of premium materials maintains safety in high-risk zones while reducing overall manufacturing costs for non-critical components.
3Reliability
If the face cover is securely fastened to block gas, then gas blocking performance is improved, but assembly complexity increases
Solution Approach 1:
The face cover and arc extinguishing shield are designed as an integral structure where the connection is built into the design itself rather than requiring separate fastening operations. This integration eliminates complex assembly steps while maintaining effective gas blocking, as the unified structure ensures proper sealing and positioning automatically.
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
Enhances product reliability by simplifying connections, reducing assembly complexity, and ensuring safe gas discharge without the need for high-insulation materials, while maintaining functionality even if the face cover is missing.
Implementation Method 1
the moving path of the gas is lengthened, so that the gas can be fully cooled and discharged from the arc extinguishing chamber directly
Data Source
AI summary
The disclosure provides a breaking unit including a stationary contact with a contact surface facing a second direction perpendicular to the first direction; a moving contact arranged at the first side of the stationary contact in the second direction and configured to move relative to the stationary contact; a plurality of arc extinguishing grids arranged at the first side of the stationary contact and at intervals along the first direction; an arc extinguishing shield including a first section and a second section, wherein the first section and the second section are connected to partially surround the arc extinguishing grid, with gaps provided between the first section and the arc extinguishing grid, as well as between the second section and the arc extinguishing grid.