Heat-Shield Panel Fastening for Quick Mat Removal
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Solution Overview
Problem
Existing fastening systems for heat-shield mats in turbojet engine nacelles are cumbersome, requiring disassembly for maintenance, are not thermally efficient, and risk damaging the mats during removal.
Innovation Solution
A fastening device with a removable element and gripping element projecting outwardly from the mat, allowing for easy detachment by tension force, utilizing self-gripping adhesive tapes or flexible hooks and loops for secure yet easy installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake wire systems with hooking structures are used to fasten heat-shield mats, then the mats are securely retained on the inner fixed structure, but the system requires disassembly for maintenance and has long intervention time
Solution Approach 1:
The fastening system is divided into separate modular components: a fastening element with gripping element that can be independently removed from the heat-shield mat, and a retaining element fixed to the inner fixed structure. This segmentation allows the fastening element to be quickly detached and replaced without affecting other components, significantly reducing maintenance time while maintaining secure retention during operation.
Solution Approach 2:
The fastening system transitions from a static, permanently fixed brake wire system to a dynamic, removable system. The fastening element can be easily attached and detached from the heat-shield mat through simple manual operations, enabling quick maintenance interventions without requiring complex disassembly procedures, thus reducing maintenance time while ensuring reliable retention when installed.
2Reliability
If brake wire systems are used to fasten heat-shield mats, then the mats are securely retained on the inner fixed structure, but the system is cumbersome and requires dismounting for wire replacement
Solution Approach 1:
The fastening system is divided into separate modular components: a fastening element with gripping element that can be independently removed from the heat-shield mat, and a retaining element fixed to the inner fixed structure. This segmentation allows the fastening element to be quickly detached and replaced without affecting other components, significantly reducing maintenance time while maintaining secure retention during operation.
Solution Approach 2:
The fastening element is designed as a simple, inexpensive component that can be quickly replaced rather than repaired. The gripping element and fastening element can be manually attached and detached without specialized tools or complex procedures, making maintenance operations simple and straightforward while ensuring reliable retention when installed.
3Ease of manufacture
If adhesive mechanical fastening systems with flexible hooks and loops are used, then installation is simplified, but the heat-shield mats are regularly deteriorated by being torn during dismount
Solution Approach 1:
The gripping element is extracted as a separate component that concentrates the mechanical stress during removal operations. Instead of the adhesive tape directly anchoring the mat to the structure, the gripping element serves as an intermediate component that absorbs the extraction forces, preventing these forces from being transmitted to and damaging the heat-shield mat material.
Solution Approach 2:
The gripping element acts as an intermediary component between the adhesive mechanical fastening system and the heat-shield mat. During removal operations, the gripping element absorbs and concentrates the extraction forces, preventing these forces from being transmitted to and damaging the heat-shield mat material, thus preserving mat integrity while enabling simple installation and removal.
4Reliability
If threaded or tapped hooking structures are used to replace brake wire systems, then the fastening is more secure, but the system becomes heavier and more expensive
Solution Approach 1:
The system replaces complex threaded or tapped mechanical fastening structures with a simpler adhesive mechanical fastening system combined with a gripping element. The adhesive tape provides secure anchoring to the inner fixed structure, while the gripping element enables reliable retention through friction and mechanical interlocking, achieving fastening security without the weight and complexity of threaded components.
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
Facilitates quick and easy installation and maintenance of heat-shield mats while reducing the risk of damage, providing improved integrity and thermal efficiency.
Implementation Method 1
The fastening element includes a first portion joined to the inner fixed structure by an adhesive tape and a second portion connected to the gripping element, the first and second portions cooperating with each other in a removable manner
Implementation Method 2
In one form, the fastening element includes flexible hooks and loops, for example textile or metallic, such as the Velcro® brand
Implementation Method 3
the gripping element is arranged so as to sandwich the heat-shield mat against the inner fixed structure
Data Source
AI summary
A device for securing at least one thermal protection mat to an internal fixed structure of a nacelle includes at least one removable fastening element for securing the at least one thermal protection mat to the internal fixed structure designed to be arranged between the mat and the internal fixed structure. The device includes at least one gripping element connected to the removable fastening element to project relative to the mat on the opposite side to the internal fixed structure, the removable fastening element being intended to be detached from the internal fixed structure by a pulling force exerted on the gripping element.