Turbine Harness Entry Assembly Heat Extraction
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Solution Overview
Problem
Heat-conduction phenomena in metal end pieces of electrical harnesses passing through turbine engine casings can lead to significant temperature increases in heat-shrinkable sleeves, risking auto-ignition due to higher temperatures in inter-duct spaces compared to secondary air ducts.
Innovation Solution
Incorporating heat-extraction means, such as a tubular metal end piece with an annular collar and a covering metal sheath with higher thermal conductivity, to redirect heat conduction away from the heat-shrinkable sleeve, while also limiting oxygen exposure to prevent auto-ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat-shrinkable sleeves are used to protect electrical harnesses in metal end pieces, then mechanical protection is improved, but temperature resistance deteriorates due to heat conduction from the metal end piece
Solution Approach 1:
A heat-extraction element is introduced as an intermediary component between the metal end piece and the heat-shrinkable sleeve. This element acts as a thermal mediator that intercepts heat conduction paths from the hot metal end piece, preventing excessive heat transfer to the temperature-sensitive heat-shrinkable sleeve material.
Solution Approach 2:
The heat-extraction element is integrated into the metal end piece structure, specifically positioned to extract heat away from the interface with the heat-shrinkable sleeve. This extraction of thermal energy at the critical interface prevents the temperature buildup that would otherwise compromise the sleeve material.
2Strength
If metal end pieces are used to pass electrical harnesses through turbine engine casings, then structural strength is improved, but heat conduction to heat-shrinkable sleeves increases
Solution Approach 1:
The heat-extraction element is strategically positioned at the local interface between the metal end piece and the heat-shrinkable sleeve, where heat conduction is most problematic. This localized heat extraction approach maintains the overall structural integrity of the metal end piece while addressing the specific thermal issue at the critical interface region.
3Temperature
If heat-extraction means are added to the tubular end piece, then temperature control is improved, but device complexity increases
Solution Approach 1:
The heat-extraction element is merged with the existing metal end piece structure, forming an integrated component rather than a separate assembly. This merging approach allows the heat extraction function to be achieved while minimizing additional complexity, as the heat-extraction element becomes part of the end piece's overall structural design.
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
Effectively prevents auto-ignition of heat-shrinkable sleeves by dissipating heat away from the sleeve and reducing oxygen availability, ensuring safe operation of electrical harnesses in turbine engine casings.
Implementation Method 1
Heat-conduction phenomena in the metal end piece may lead to a significant increase in the temperature of the heat-shrinkable sleeve
Implementation Method 2
the covering metal sheath with higher thermal conductivity, to redirect heat conduction away from the heat-shrinkable sleeve
Data Source
AI summary
An assembly for passing an electrical harness through a wall includes a tubular metal end piece passing right through the wall and housing the electrical harness. The assembly further includes a sleeve made from heat-shrinkable material extending around an end part of the tubular end piece and of the electrical harness. The assembly further includes structures for extracting heat from the tubular end piece that are arranged on the side of the end piece surrounded by the heat-shrinkable sleeve.