Compressor Housing Bearing Support Structure for Axial Seal Retention
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Solution Overview
Problem
Conventional aircraft environmental control systems face challenges in efficiently supporting the axial movement and sealing of components within air cycle machines, leading to potential misalignment and reduced performance due to the lack of effective bearing support structures and seal retention mechanisms.
Innovation Solution
The design incorporates a compressor housing with a bearing support structure featuring a bearing groove, O-ring grooves, and a non-uniform surface for seal retention, including a flat central portion and inclined ends, to securely position and limit the axial movement of bearings and seals, enhancing the rotational stability and sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bearing support structure is used, then the axial movement of bearings and seals is not effectively limited, but this leads to misalignment and reduced performance
Solution Approach 1:
The bearing support structure is segmented into multiple functional features: a bearing groove for radial support, O-ring grooves for sealing, and a non-uniform surface with a flat central portion and inclined ends for axial retention of the seal. This segmentation allows each feature to perform its specific function while collectively providing comprehensive support and alignment stability.
Solution Approach 2:
The non-uniform surface acts as an intermediary mechanism between the seal and the bearing support structure. The flat central portion provides a bearing surface for axial positioning, while the inclined ends guide and limit axial movement, effectively mediating the interaction between the seal and housing without requiring additional complex retention mechanisms.
2Reliability
If simple seal retention is used, then the device complexity is reduced, but sealing efficiency and rotational stability are compromised
Solution Approach 1:
The bearing support structure employs local quality by creating a non-uniform surface with distinct regions: a flat central portion for primary seal contact and axial positioning, and inclined ends for secondary contact and axial limitation. Each region has optimized local properties tailored to its specific function, enhancing sealing efficiency without requiring a completely separate retention mechanism.
3Reliability
If multiple separate components are used for bearing and seal support, then the retention function is improved, but the device complexity and assembly difficulty increase
Solution Approach 1:
The patent merges multiple retention functions into a single integrated bearing support structure. The bearing groove, O-ring grooves, and non-uniform surface with inclined ends are all combined in one housing feature, eliminating the need for separate retention components and reducing assembly complexity while maintaining reliable component retention.
Solution Approach 2:
The bearing support structure is designed as a multi-functional element that simultaneously provides radial bearing support, axial seal retention, sealing surfaces, and alignment guidance. This universal structure performs multiple functions that would traditionally require separate components, simplifying the overall device while improving reliability.
Data Source
AI summary
A compressor housing for an air cycle machine includes an inlet and an outlet. The compressor housing additionally includes a plurality of ribs that extend generally perpendicularly from a surface of the compressor housing. Formed within an internal region of the compressor housing is a bearing support structure. The bearing support structure receives and limits the axial movement of a bearing, seal and at least one O-ring.