Gas Turbine Filter Assembly Non-Concentric Housing
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Solution Overview
Problem
Existing gas turbine engine lubricant filtration systems face challenges in maintaining effective contamination removal and ease of filter replacement, particularly in configurations where space constraints prevent downward movement of the filter cartridge, leading to risks of debris entering the clean lubricant outlet during maintenance.
Innovation Solution
A filter assembly design featuring a housing with non-concentric sections creating a shoulder for secure cartridge placement, a keyway engagement for locking, and a sealing mechanism to prevent debris from entering the lubricant outlet, allowing for easy replacement and maintenance by removing the filter cartridge and cover as a single unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the filter cartridge is designed to be removable for maintenance, then ease of repair is improved, but the risk of debris entering the clean lubricant outlet during maintenance increases
Solution Approach 1:
The filter assembly is divided into separable components: the housing, the filter cartridge, and the cover. This segmentation allows the filter cartridge to be removed independently for maintenance while the housing and cover remain in place, enabling easy replacement without exposing the clean lubricant outlet to debris.
Solution Approach 2:
The cover acts as an intermediary component that seals the housing opening and protects the clean lubricant outlet during maintenance operations. When the filter cartridge is removed, the cover remains in place to prevent debris from entering the outlet, thus mediating between the need for filter replacement and the need to protect the clean lubricant pathway.
2Stability of the object's composition
If the housing is designed with non-concentric sections creating a shoulder, then the stability of cartridge placement is improved, but the device complexity increases
Solution Approach 1:
The housing incorporates non-concentric sections with a shoulder that is offset from the central axis, creating an asymmetric structure. This asymmetry provides a positive stop that guides the filter cartridge into its correct position and prevents improper installation, thereby enhancing placement stability without requiring complex locking mechanisms.
Solution Approach 2:
The shoulder structure creates a uniform positioning reference surface that ensures the filter cartridge is installed at the correct axial position. By providing a consistent mechanical stop around the cartridge, the design ensures stable placement without requiring multiple alignment features or complex adjustment mechanisms.
3Reliability
If the sealing member is positioned between the housing and cartridge assembly, then the purity of lubricant is improved, but the ease of operation during maintenance decreases
Solution Approach 1:
The sealing member is integrated into the cover component, merging the sealing function with the protective cover. This integration ensures that the sealing member remains in place during maintenance operations, maintaining lubricant purity while the cover itself provides the ease of operation by being a single removable unit that protects the outlet during filter replacement.
Data Source
AI summary
A filter assembly for an engine, has: a housing having a longitudinal axis and defining an internal volume, the housing having an open end and defining an oil inlet and an oil outlet, the internal volume having a first zone and a second zone, the first zone in fluid communication with the oil inlet, the second zone in fluid communication with the oil outlet; a cartridge assembly having a filter cartridge, and a cover sealingly engageable to the housing to close the open end of the housing, the filter cartridge axially locked in the housing by the cover, the cover removably securable to the housing; and a sealing member between the housing and the cartridge assembly, the sealing member separating the first zone from the second zone such that the first zone communicates with the second zone through the filter cartridge.