Switch Pole Arc Chamber Cover for Uniform Arc Quenching
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Solution Overview
Problem
Existing low-voltage switching devices suffer from uneven distribution of electric arcs among arc-breaking elements, leading to inefficient arc-quenching, high mechanical and thermal stresses, and potential damage to non-designated components due to arcs jumping outside the arc-extinguishing region, exacerbated by higher energy arcs at modern operating voltages.
Innovation Solution
A switch pole design featuring an insulating casing with a contact region and arc-extinguishing region, including a terminal arc-breaking element with aligned through-holes and a cover to direct arcs efficiently through all arc-breaking plates, improving fluid dynamics and cooling, while an insulating wall separates the regions to prevent arc deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional arc chambers without covers are used, then the structure is simple and manufacturing is easy, but electric arcs are not uniformly distributed among arc-breaking elements and may jump to other conductive parts
Solution Approach 1:
The arc chamber is segmented into multiple regions by introducing partition walls that divide the internal space. This segmentation creates distinct arc extinguishing zones, ensuring that electric arcs are distributed uniformly across multiple arc-breaking elements rather than concentrating in one area, thereby improving reliability and uniform arc distribution.
Solution Approach 2:
Partition walls act as intermediary structures between the electric arcs and the arc-breaking elements. These walls guide and direct the arcs toward designated breaking points, preventing arcs from jumping to unauthorized conductive parts while maintaining a relatively simple overall structure.
2Speed
If arc-breaking elements are positioned close to contacts for efficient arc quenching, then arc extinction speed improves, but mechanical and thermal stresses on the arc chamber increase
Solution Approach 1:
The arc chamber is divided into multiple segmented zones using partition walls, with each zone containing arc-breaking elements positioned at optimized distances from the contacts. This segmentation allows arcs to be extinguished efficiently in each zone while distributing the mechanical and thermal stresses across multiple separated regions rather than concentrating them in one location.
Solution Approach 2:
Different regions of the arc chamber are designed with locally optimized properties: partition walls are positioned to create zones where arc-breaking elements are close to contacts for rapid extinction in high-stress areas, while other regions provide buffer zones that reduce overall mechanical and thermal stress on the chamber structure.
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
Ensures uniform and efficient arc-quenching, reduces mechanical and thermal stresses, prolongs device lifetime, and prevents arcs from striking external components, with a simple and cost-effective manufacturing process.
Implementation Method 1
The cover has a through-hole in fluid-dynamic communication with the through-hole of the plate portion in such a way that hot gases can pass through the plate portion and the cover, during operation, of the switching device
Data Source
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AI summary
A switch pole for a low voltage switching device comprising: - an insulating casing defining an internal space with a contact region and an arc extinguishing region of said switch pole; - a fixed contact assembly and a movable contact assembly positioned in said contact region and including, respectively, one or more fixed contacts and one or more movable contacts, which can be mutually coupled or uncoupled; - an arc chamber positioned in said arc extinguishing region and comprising a plurality of parallel arc-breaking plates and a terminal arc-breaking element, which comprises a plate portion arranged in parallel to said arc-breaking plates and a cover of electrically insulating material coating, at least partially, a surface of said plate portion.