Zoned Seal Coating Layout for Capillarity-Safe Sliding Contact
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Solution Overview
Problem
Existing seals in propulsion units fail to prevent the passage of flammable fluids through capillarity and do not maintain leak-tightness during frictionless sliding contact, risking damage to equipment in adjacent compartments.
Innovation Solution
A seal with a longitudinal sector composed of elastic material, featuring alternating zones of anti-friction and leak-tight coatings, prevents fluid passage by capillarity and ensures leak-tight, frictionless sliding contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an anti-friction coating is applied over the seal to facilitate sliding contact with the movable cowl, then friction-induced damage is reduced and leak-tightness is maintained, but the seal becomes vulnerable to fluid infiltration through capillarity
Solution Approach 1:
The seal surface is segmented into multiple functional zones along its circumference: anti-friction coating zones for sliding contact and leak-tight coating zones for fluid barrier protection. This segmentation allows each zone to perform its specific function without compromising the other, resolving the contradiction between friction reduction and fluid infiltration prevention.
Solution Approach 2:
Different regions of the seal are assigned different coating properties: anti-friction coating in areas requiring sliding contact and leak-tight coating in areas requiring fluid barrier protection. This local differentiation of material properties enables the seal to simultaneously achieve low friction and fluid tightness against the movable cowl.
2Ease of operation
If a uniform anti-friction coating is applied over the entire seal surface, then sliding contact is facilitated, but fluid can infiltrate through capillarity and damage equipment in adjacent compartments
Solution Approach 1:
The seal surface is segmented into multiple functional zones along its circumference: anti-friction coating zones for sliding contact and leak-tight coating zones for fluid barrier protection. This segmentation allows each zone to perform its specific function without compromising the other, resolving the contradiction between friction reduction and fluid infiltration prevention.
Solution Approach 2:
Different regions of the seal are assigned different coating properties: anti-friction coating in areas requiring sliding contact and leak-tight coating in areas requiring fluid barrier protection. This local differentiation of material properties enables the seal to simultaneously achieve low friction and fluid tightness against the movable cowl.
3Reliability
If the seal material is made highly elastic to maintain leak-tightness during movement, then sealing performance is improved, but friction and wear increase during sliding contact
Solution Approach 1:
The seal incorporates different material properties in different regions: highly elastic leak-tight material in contact zones requiring sealing and anti-friction coating in sliding zones. This local differentiation allows the seal to maintain leak-tightness where needed while minimizing friction and wear during sliding contact with the movable cowl.
Solution Approach 2:
The seal uses a composite structure combining elastic leak-tight material with anti-friction coating materials. This composite approach allows the seal to simultaneously exhibit high elasticity for maintaining sealing pressure and low friction for smooth sliding contact, resolving the contradiction between sealing performance and friction reduction.
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 seal effectively prevents fluid transfer between compartments by capillarity while maintaining leak-tightness and reducing friction-induced damage, enhancing safety and reliability of propulsion units.
Implementation Method 1
an anti-friction coating may be placed over the seal 15, thereby allowing making it slide in contact with the movable cowl 11
Implementation Method 2
By capillarity, the fluids 21 could move along the seal 15 and reach the second compartment 13
Implementation Method 3
a seal (23) configured to be arranged between a first element (17) and a second element (11) in an assembled configuration, the seal comprising a longitudinal sector intended to be in contact with the second element (11), the longitudinal sector being formed of a substantially elastic leak-tight material
Data Source
AI summary
A seal is configured to be arranged between a first element and a second element of a propulsion assembly. The seal includes a longitudinal sector designed to be in contact with the second element, wherein the longitudinal sector is formed of an elastic leak-tight material and includes a first zone having an anti-friction coating, a second zone having a leak-tight coating, and a third zone having an anti-friction coating. The first, second and third zones arranged side by side and extend longitudinally from a first end to a second end of the longitudinal sector.