Two-Part IDC Housing for Nichrome Wire Test Compliance
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Solution Overview
Problem
Conventional insulation displacement connectors often fail to meet safety standards, such as the Nichrome Wire Test, due to flammability issues, leading to the need for fireproof designs that increase production costs and complexity.
Innovation Solution
A connector with a housing composed of two mechanically coupled portions made of different materials, where the first portion is made of high flammability-resistant materials like polyamide with glass fiber, and the second portion is made of less resistant materials, allowing for targeted thermal stress management and cost reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire connector housing is made of high flammability-resistant materials, then the connector can pass safety tests like the Nichrome Wire Test, but the production cost increases
Solution Approach 1:
The connector housing is divided into two portions: a first portion made of high flammability-resistant material (polyamide with 30% glass fiber) and a second portion made of less resistant material. This local differentiation applies fireproof properties only where thermal stress occurs during safety tests, reducing overall material cost while maintaining test passability.
Solution Approach 2:
The housing is segmented into two distinct portions that can be manufactured separately and then assembled. The first portion requires high-temperature resistant material for safety test compliance, while the second portion uses standard materials, allowing independent optimization of each segment's material properties based on functional requirements.
2Reliability
If high flammability-resistant materials are used throughout the connector, then safety test compliance is achieved, but production efficiency decreases due to higher processing requirements
Solution Approach 1:
High-performance material processing (injection molding with 30% glass fiber) is applied only to the first portion requiring fireproof properties, while the second portion uses standard processing methods. This localized approach maintains safety compliance while improving overall production efficiency by reducing the scope of complex material processing.
3Strength
If uniform high-performance material is used for the entire housing, then thermal stress resistance is maximized, but material costs and processing complexity increase
Solution Approach 1:
The housing structure implements different material properties in different regions: the first portion uses polyamide with 30% glass fiber for high thermal stress resistance, while the second portion uses less resistant material. This eliminates the need for uniform high-performance materials throughout, simplifying manufacturing while maintaining adequate thermal resistance where needed.
Data Source
AI summary
An insulation displacement connector connecting to a sheathed insulated cable has a housing including a first portion and a second portion mechanically engaging the first portion. The first portion is made of a different material than the second portion.