Helicopter Rotor Mast Labyrinth Seal for Water Intrusion
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Solution Overview
Problem
Current helicopter rotor seal systems are ineffective in preventing water intrusion, particularly around the mast area, which can lead to structural damage and operational issues.
Innovation Solution
A novel protective labyrinth seal system is introduced, comprising a rotor mast with an annular horizontal seal and an upper annular rotor mast seal made from composite materials like polymers, rubbers, or metals, which forms a labyrinthine path to prevent water penetration. The system includes a sleeve and an annular mast cover to create a fluid-tight connection and reduce water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional rotor seal system is used, then the structure is simple, but water penetration occurs leading to structural damage
Solution Approach 1:
The seal system is divided into multiple independent components: an annular seal positioned at the rotor-mast interface, a labyrinthine pathway structure with alternating solid and gaps, and a mast cover. This segmentation allows each component to perform its specific function while collectively providing comprehensive water protection without requiring a completely complex redesign of the entire rotor system.
Solution Approach 2:
The patent introduces an intermediary labyrinthine structure between the rotor seal and the external environment. This intermediary pathway with controlled gaps and solid sections acts as a mediator that allows necessary rotor movement while blocking water penetration, resolving the contradiction between maintaining simple structure and preventing water intrusion.
2Reliability
If a fluid-tight seal is created to prevent water intrusion, then water penetration is reduced, but rotor movement may be constrained
Solution Approach 1:
The seal system incorporates dynamic elements including the labyrinthine pathway that accommodates rotor rotation, flexible sealing components that adapt to movement, and a design where the annular seal and mast cover maintain sealing effectiveness during operational movements. This dynamic design ensures water protection is maintained while allowing full rotor operational freedom.
Solution Approach 2:
The patent applies different sealing qualities at different locations: the annular seal provides tight sealing at the rotor-mast interface where water intrusion is most critical, while the labyrinthine pathway with controlled gaps provides protection in other areas without constraining movement. This localized quality differentiation resolves the contradiction between fluid-tight sealing and movement freedom.
3Reliability
If multiple seal components are added to improve water protection, then water penetration prevention is enhanced, but manufacturing complexity increases
Solution Approach 1:
The seal system is segmented into distinct manufacturable components (annular seal, labyrinthine structure, mast cover) that can be manufactured separately using standard processes and then assembled. This segmentation reduces manufacturing complexity compared to creating a single complex integrated seal, as each component can be optimized and produced independently.
Solution Approach 2:
The patent employs a nested arrangement where the annular seal is positioned within the mast cover structure, and the labyrinthine pathway is integrated within the existing rotor assembly. This nesting allows multiple seal components to be incorporated without proportionally increasing assembly complexity, as they fit within existing structural spaces.
Data Source
AI summary
The present invention includes a helicopter rotor seal assembly comprising: a rotor mast having a longitudinal axis and an outer surface; a sleeve aligned longitudinally with the axis and surrounding a portion of the rotor mast, the sleeve having an outer surface, and an inner surface; an annular horizontal seal between the inner surface of the sleeve and the outer surface of the rotor mast; and an upper annular rotor mast seal affixed to the outer surface of the rotor mast and extending outwardly sufficient to cover the annular horizontal seal.