Removable Electrical Cut-off Element Sealing and Gas Evacuation
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Solution Overview
Problem
Existing removable electrical cut-off elements in electrical devices suffer from insufficient tightness, leading to gas leaks and increased risk of restrikes, compromising safety due to incomplete evacuation of breaking gases.
Innovation Solution
A removable electrical cut-off element with improved sealing, featuring a housing with integrally formed protective walls and insulating walls that enhance gas containment, and a separate casing design with complementary fastening members, along with a gas evacuation channel to efficiently cool and discharge cut-off gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If removable cut-off elements are made with separable housing parts for ease of assembly and maintenance, then ease of operation is improved, but tightness against cutting gases deteriorates
Solution Approach 1:
The housing is divided into two separable parts: a first housing part and a second housing part. This segmentation allows easy assembly and disassembly for maintenance while maintaining functional integrity. The separable design enables independent access to different components without requiring complete disassembly.
Solution Approach 2:
The sealing element is integrated into the second housing part, merging the sealing function with the structural component. This combination ensures that the sealing capability is inherent to the housing structure itself, providing reliable gas containment while maintaining the separable design for ease of assembly.
2Ease of manufacture
If conventional sealing methods are used in separable housings, then ease of manufacture is improved, but tightness against cutting gases deteriorates
Solution Approach 1:
A flexible sealing element is employed to bridge the interface between the two separable housing parts. This flexible component deforms to accommodate manufacturing tolerances and assembly variations while maintaining effective sealing, thus preserving both ease of manufacture and reliable tightness against cutting gases.
3Reliability
If gas evacuation channels are added to improve gas evacuation, then reliability is improved, but device complexity increases
Solution Approach 1:
The second housing part serves multiple functions: it provides structural support, integrates the sealing element, and incorporates the gas evacuation channel. This multi-functionality reduces the need for additional separate components, thereby improving gas evacuation capability while minimizing increases in device complexity.
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 improved sealing reduces gas leaks and the risk of electric current recirculation, enhancing the safety and reliability of the electrical switching device by effectively evacuating and cooling cut-off gases.
Implementation Method 1
when the electrical contacts are separated while an electric current is flowing, an electric arc appears between these contacts. The electric arc ionizes the ambient air and generates breaking gases
Implementation Method 2
the breaking gases are cooled and evacuated from the breaking element, via evacuation channels specially provided for this purpose
Data Source
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AI summary
This removable current-interrupting element (6) comprises a housing with a first base plate and a second base plate (50) positioned opposite each other. The housing includes insulating walls (80) extending around the electrically movable contacts (36) from the second base plate (50) in a direction (X, X') perpendicular to the second base plate (50). The housing further includes protective walls (84) that at least partially cover the inner faces of the insulating walls (80), these protective walls (84) being formed as a single unit with the second base plate (50).