Compressor Control Ring Reconditioning via Segmented Interface
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Solution Overview
Problem
High pressure compressor control rings with deformed housings due to friction forces from guide shoes suffer deformation or damage, leading to non-compliance and costly replacement, and increased risk of set screw deformation or breakage.
Innovation Solution
A reconditioning method involving machining of deformed housings to fit an interface part with holding tabs, allowing the interface part to be securely stationary within the control ring, and optionally using an elastic interface part with deformation slits for press-in installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If guide shoes are used to ensure concentricity and limit deformation, then control stability is improved, but friction forces cause housing deformation and damage
Solution Approach 1:
The housing is segmented into a first part and a second part, with the interface part serving as a removable connector between them. This segmentation allows the interface part to absorb friction forces from guide shoes, protecting the main housing structure from deformation while maintaining control ring stability.
Solution Approach 2:
The interface part acts as an intermediary element between the housing and guide shoes. It receives friction forces from guide shoes during operation, preventing these forces from directly deforming the housing. The interface part can be replaced if damaged, while the main housing remains intact.
2Ease of operation
If clearance is provided for guide shoe movement, then operational flexibility is improved, but pressure at the interface increases causing deformation
Solution Approach 1:
The interface part serves as a mediator that absorbs the pressure generated by guide shoe movement within the clearance. It takes the mechanical stress from guide shoe contact with the case, preventing this pressure from being transmitted to and deforming the main housing structure.
3Reliability
If control ring is discarded when housing deforms, then reliability is maintained, but manufacturing cost increases
Solution Approach 1:
By segmenting the housing into replaceable interface parts and a permanent main structure, the system allows partial replacement. Only the damaged interface part needs replacement, not the entire control ring, thereby maintaining reliability while reducing manufacturing costs.
Solution Approach 2:
The interface part is designed as a consumable component that can be discarded when deformed and recovered/replaced independently. This allows the valuable main housing and control ring structure to be recovered and reused, avoiding the need to discard the entire control ring assembly.
4Device complexity
If set screw is used to secure guide shoe, then assembly simplicity is improved, but plastic deformation or breakage risk increases
Solution Approach 1:
The interface part acts as an intermediary that protects the set screw from excessive flexion forces. By providing a compliant interface between the housing and guide shoe, it reduces the mechanical stress transmitted to the set screw, preventing plastic deformation and breakage while maintaining simple assembly.
Data Source
AI summary
An interface member equips a control ring of a high-pressure compressor of an engine. This control ring has at least one housing intended to partially house a guide shoe. This interface member includes a central wall to which two holding tabs are secured, delimiting a through-housing having dimensions substantially identical to the initial dimensions of the housing, and suitable for being inserted into the housing, after it has been machined to receive same following a deformation, until the holding tabs keep it stationary relative to the control ring.