Three-Layer Gas Diffuser for Arc Current Loop-Back Prevention
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Solution Overview
Problem
Existing electrical apparatuses with high breaking capacity face risks of arc current loop-back due to inadequate gas diffusers, leading to potential short-circuits and hazards, especially in industrially rated devices with high short-circuit breaking currents.
Innovation Solution
A three-layered gas diffuser with a central layer and outer layers of electrically insulating materials, featuring misaligned through holes, is interposed between the arc-extinguishing chamber exhaust orifice and the filter, elongating the gas trajectory and enhancing mechanical rigidity to prevent arc current loop-back while maintaining compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas diffuser is used to prevent arc current loop-back, then safety is improved, but the device complexity increases
Solution Approach 1:
The gas diffuser is segmented into three distinct layers (first layer, second layer, third layer) with each layer containing through-holes at specific positions. This segmentation allows the diffuser to provide comprehensive arc current prevention while maintaining a compact structure that integrates smoothly into the electrical apparatus.
Solution Approach 2:
The gas diffuser acts as an intermediary component positioned between the arc-extinguishing chamber and the filter. It mediates the flow of extinguishing gases while blocking arc current paths, thereby protecting the filter and external components without requiring complex additional protection systems.
2Reliability
If the gas diffuser length is increased to improve arc current prevention, then safety is improved, but the volume of the device increases
Solution Approach 1:
Instead of increasing the length of the gas diffuser in the axial direction, the invention uses a multi-layer structure that increases the effective trajectory length in the radial dimension. The three layers with misaligned through-holes create a longer arc current path without proportionally increasing the overall device volume.
Solution Approach 2:
The three-layer structure of the gas diffuser is nested within the existing housing structure of the electrical apparatus. The layers are arranged concentrically with the exhaust orifice, allowing the extended arc prevention trajectory to be contained within the existing volume constraints of the device.
3Reliability
If a filter is used to cool and deionize extinguishing gases, then safety is improved, but the risk of arc current loop-back via the filter increases
Solution Approach 1:
The gas diffuser serves as an intermediary protective layer between the arc-extinguishing chamber and the filter. It blocks direct arc current paths to the filter while allowing extinguishing gases to pass through, thereby protecting the filter from arc current loop-back without compromising its cooling and deionization functions.
Solution Approach 2:
The gas diffuser provides localized electrical insulation specifically at the interface between the arc-extinguishing chamber and the filter. The through-holes are positioned to allow gas flow while the solid portions between holes provide localized blocking of arc current paths, creating a selective function that addresses the specific hazard without affecting overall filter performance.
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 arc current loop-back and ensures mechanical stability, reducing the risk of short-circuits and hazards, even at high breaking currents, while maintaining a compact and rigid structure compatible with industrial constraints.
Implementation Method 1
the gas diffuser is interposed between the exhaust orifice and the filter... elongating the gas trajectory
Implementation Method 2
an electrical arc can be generated between these two electrical contacts. This electrical arc ionizes the ambient air in the device, thereby generating gases, described as extinguishing gases
Implementation Method 3
Extinguishing gases must therefore be cooled and deionized, using a dedicated filtration system on the device
Data Source
AI summary
An electrical apparatus for breaking an electric current includes an electrical arc extinguishing chamber, for extinguishing an electrical arc formed on the separation of electric contacts, provided with an extinguishing gas exhaust orifice and an extinguishing gas filtration system, placed at the output of the exhaust orifice and including a filter and a gas diffusor. The gas diffuser includes, superposed between them, a central layer and two outer layers arranged on either side of the central layer. The central layer is provided with first through holes. Each outer layer is provided with second through holes. The first holes are misaligned relative to the second holes so that each of the second holes emerges on a solid portion of the central layer without any first hole.