Flat Conductive Element for Helicopter Blade De-icing
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Solution Overview
Problem
Existing conductive elements for de-icing systems in helicopter blades face issues with uncontrolled impregnation and positioning, leading to deformations and reduced effectiveness due to their structure, which affects the blade's design and heating system efficiency.
Innovation Solution
A conductive element with a flat, thin insulating sheath containing parallel and equidistant metal braids, allowing for controlled impregnation and positioning within the blade, and featuring sliding channels to prevent adhesion and facilitate easy removal, maintains the blade's design integrity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple metal braids surrounded by insulating sheaths are used for heating system, then heating function is achieved, but impregnation and positioning in the blade thickness become uncontrolled causing deformations
Solution Approach 1:
Multiple separate metal braids with individual sheaths are merged into a single integrated conductive element where braids are positioned side-by-side within a common flat insulating sheath, enabling controlled impregnation and positioning as one unit
Solution Approach 2:
The insulating sheath is segmented into multiple channels that separately accommodate each metal braid, allowing independent positioning control while maintaining overall structural integrity during impregnation
2Ease of manufacture
If metal braids are embedded in helicopter blade thickness, then de-icing system is produced, but deformations are created inside the blade harming its design
Solution Approach 1:
A flat insulating sheath with a thin, flexible profile is used to contain the metal braids, allowing the assembly to be embedded in the blade thickness without creating protrusions or deformations that would harm the blade's aerodynamic design
3Reliability
If metal braids are surrounded by insulating sheath, then electrical insulation is provided, but adhesion occurs between braid and sheath making stripping difficult
Solution Approach 1:
A lubricating substance is introduced as an intermediary between the metal braid and insulating sheath, preventing direct adhesion and enabling easy stripping of the braid from the sheath while maintaining electrical insulation
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 solution enables a simple, safe, and rational design for the conductive element, ensuring optimal impregnation and positioning without adding thickness, thus enhancing the de-icing system's effectiveness and maintaining the helicopter blade's structural integrity.
Implementation Method 1
The circulation of the electric current along said braids creates a heating by Joules effect
Data Source
Figure 1
Figure 2
AI summary
The element (1) has a flat insulating sheath (2) defining a plane (P). The insulating sheath is made of thermoplastic, and defines two zones (4a, 4b), where each zone includes a flat metal braid (3). The two zones are separated by a neutral zone (5) containing no braids. The braids of the zones are arranged along the length, in parallel with respect to each other and in the plane of the insulating sheath, where the braids extend beyond the insulating sheath to allow the connection of the braids with metal connectors (6).