Galley insert motor having dynamic seal on exterior of motor housing
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Solution Overview
Problem
Dynamic seals in aircraft galley insert motors often become misaligned due to shaft deflection, leading to rapid wear, motor failure, and pressure leaks, making replacement difficult and time-consuming.
Innovation Solution
The dynamic seal is mounted on the exterior of the motor housing, allowing for improved alignment and easier installation, replacement, and servicing, with a configuration that reduces the number of parts and maintains alignment during service and removal, and positioning it closer to the bearing point to minimize deflection and stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the dynamic seal is mounted inside the motor housing, then the motor structure is compact, but the dynamic seal becomes difficult and time-consuming to replace requiring motor disassembly
Solution Approach 1:
The dynamic seal is extracted from the interior of the motor housing and mounted on the exterior surface. This allows the seal to be accessed and replaced independently without disassembling the motor housing, resolving the contradiction between compact structure and ease of repair.
Solution Approach 2:
A seal retainer component serves as an intermediary element that secures the dynamic seal to the motor housing exterior. This mediator allows for easy seal replacement while maintaining a compact integrated structure.
2Ease of operation
If the dynamic seal is positioned far from the bearing point, then the seal is easier to install, but shaft deflection causes misalignment and rapid seal wear
Solution Approach 1:
The seal retainer is designed with flexible or adjustable characteristics that allow it to accommodate shaft deflection and turbulence. This dynamic capability maintains seal alignment despite shaft movement, resolving the contradiction between installation ease and alignment reliability.
Solution Approach 2:
The seal mounting position and retainer characteristics are optimized to balance the competing requirements. The seal is positioned at an optimal distance from the bearing point that allows adequate installation access while minimizing the negative effects of shaft deflection through adjusted geometric parameters.
3Ease of repair
If the dynamic seal is mounted on the exterior of the motor housing, then the seal is easily accessible for replacement, but the seal is exposed to more environmental stress
Solution Approach 1:
The dynamic seal itself acts as a flexible barrier that is specifically designed to resist environmental factors such as heat, moisture, and contamination. By using high-quality flexible sealing materials, the seal can be positioned externally while still protecting the motor interior from harmful environmental exposure.
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
This configuration extends the dynamic seal's life, reduces the need for realignment, and simplifies maintenance by allowing for external dynamic seal replacement without opening the motor housing, while minimizing deflection and stress on the seal, thus enhancing motor and seal durability.
Implementation Method 1
a dynamic seal installed within the dynamic seal seat and on the exterior of the motor housing, the dynamic seal preventing matter from the inner cavity from entering an interior of the motor housing
Implementation Method 2
the shaft is driven and as the shaft is deflected at least by gravity effects
Implementation Method 3
the shaft is driven and as the shaft is deflected at least by gravity effects, turbulence
Implementation Method 4
the shaft is driven and as the shaft is deflected at least by gravity effects, turbulence, and vibrations
Data Source
AI summary
A system may include an aircraft galley insert; an aircraft galley insert motor mount; and an aircraft galley insert motor. The aircraft galley insert motor may include: a motor housing; a dynamic seal seat extending from an exterior of the motor housing toward the aircraft galley insert motor mount; a dynamic seal installed within the dynamic seal seat and on the exterior of the motor housing, the dynamic seal preventing matter from an inner cavity from entering an interior of the motor housing; and a shaft driven by the aircraft galley insert motor, the shaft extending from within the aircraft galley insert motor, through the motor housing, through the dynamic seal, and into the inner cavity of the aircraft galley insert, wherein the dynamic seal forms a seal around the shaft as the shaft is driven and as the shaft is deflected at least by gravity effects, turbulence, and vibrations.