Arc Extinguishing Chamber Reinforcement for Stable Plate Spacing
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Solution Overview
Problem
Existing electrical protection devices, such as circuit breakers, face issues with electric arcs persisting at the entrance of the breaking chamber, leading to premature wear of the flanges and reduced reliability due to deformation or welding of metal separating plates, and the use of metal screws compromising dielectric strength.
Innovation Solution
The arc interruption chamber features reinforcing pieces on the inner faces of flanges to maintain spacing between metallic separating plates, using notches and retaining elements, and a filtration cover with intercalated elements to enhance spacing and insulation, replacing metal screws with elastic snap-fit connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal separating plates are used to extinguish the electric arc, then the arc extinction capability is improved, but the plates deform or weld together due to magnetic field attraction, reducing reliability
Solution Approach 1:
Non-conductive spacers are introduced as intermediary elements between the metal separating plates. These spacers act as mediators that maintain the required spacing between plates while being immune to magnetic field attraction, thereby preventing plate deformation and welding while preserving arc extinction capability
Solution Approach 2:
The material parameter of the spacing maintainers is changed from conductive (metal) to non-conductive (electrically insulating material). This parameter change makes the spacing maintainers insensitive to magnetic field attraction forces, allowing them to maintain stable plate spacing under arc conditions without deforming or welding together
2Strength
If metal screws are used to fix the filtration cover, then the mechanical strength of the connection is improved, but the dielectric strength is reduced
Solution Approach 1:
The fastening system uses a composite approach combining non-conductive spacers for spacing maintenance with non-conductive fastening elements (such as plastic screws or clips) for mechanical attachment. This composite solution provides sufficient mechanical strength while maintaining dielectric integrity, as the non-conductive materials prevent electrical conduction paths through the filtration cover assembly
3Duration of action of moving object
If the electric arc remains at the entrance of the breaking chamber, then the arc extinction process is prolonged, but the flanges suffer premature wear and degradation
Solution Approach 1:
Sacrificial protective elements made from arc-resistant but replaceable materials are positioned at the flange corners where arc erosion occurs most severely. These elements act as disposable protective barriers that absorb arc damage, allowing the main flange structure to remain intact for longer service periods while the sacrificial elements can be replaced during maintenance
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 the durability and reliability of the breaking chamber by maintaining plate spacing and improving dielectric strength, reducing wear and degradation, while optimizing arc extinction and filtration.
Implementation Method 1
the formation of an electric arc at the contacts when they separate, allowing current to pass between them
Implementation Method 2
the arc, which is a plasma or ionized gas
Implementation Method 3
these metal separating plates are subjected to a magnetic field that attracts them together, causing them to deform or twist
Data Source
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AI summary
Electric arc extinction chamber for an electrical protection device and an electrical protection device comprising at least one such extinction chamber. The present invention relates to an electric arc extinction chamber comprising juxtaposed metal separation plates (1) spaced apart from each other and at least two flanges (2) arranged on either side of the plates so as to hold them in position. It further comprises at least one reinforcing part (3) arranged on the inner face (2a) of each flange (2) extending along the juxtaposed metal separation plates, each lateral side (1a) of the separation plates comprising at least one notch (10a) provided with at least one retaining element (100a) projecting out of the notch (10a), each reinforcing part being inserted into the notches and the retaining elements passing through the reinforcing part and the flange so as to reinforce the maintenance of the spacing between the plates. It also relates to an electrical protection device comprising at least one such extinction chamber.