Electrical Housing Test Passageway for Sealed Nature Verification
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Solution Overview
Problem
The existing methods for testing the sealed nature of electrical housings, particularly in the automotive industry, are not sufficiently reliable or repeatable due to the difficulty in controlling the dimensions of the open space between the insulation and metal conductor of electrical cables, which affects the accuracy of air injection tests for hermetic sealing.
Innovation Solution
An electrical housing design that includes a test passageway with specific dimensions and positioning to prevent access to live elements, combined with a sealing plug that ensures a sealed closure, allowing for reliable testing of the housing's sealed nature using a controlled fluid injection method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air is injected into the open space between cable insulation and metal conductor for testing sealed nature, then the test can be performed, but the test reliability and repeatability are insufficient due to uncontrolled dimensions
Solution Approach 1:
The patent introduces a test passageway as an intermediary element with precisely controlled dimensions (e.g., 1mm diameter hole) that replaces the uncontrolled open space between cable insulation and conductor. This intermediary provides a standardized, reproducible path for air injection testing while maintaining electrical isolation through positioning away from live conductors.
Solution Approach 2:
The patent segments the testing function from the cable structure itself by creating a separate test passageway in the housing wall. This segmentation allows the test dimensions to be independently controlled and standardized, decoupling the test reliability from the manufacturing variability of cable assembly tolerances.
2Reliability
If test passageway is created in housing wall, then reliable testing is enabled, but access to live elements must be impeded
Solution Approach 1:
The test passageway serves as an intermediary channel that allows air injection for sealing tests while maintaining physical and electrical isolation from live conductors. The passageway is positioned and dimensioned to provide testing capability without creating a hazard pathway to electrified parts.
Solution Approach 2:
The housing is designed with the test passageway and positioning features (such as ribs or stops) built in during manufacturing, establishing the safe geometry before any testing occurs. This preliminary design ensures that subsequent testing operations cannot inadvertently access live elements.
Data Source
AI summary
An electrical housing comprises an opening adapted to receive an electrical cable and/or an electrical connector, a housing wall delimiting an internal volume of the electrical housing, and a test passageway. The test passageway has a dimension and a position in the housing wall adapted to permit testing of a sealed nature of the electrical housing while impeding access to an electrically live element in the internal volume of the electrical housing.