Segmented Inner Shroud Assembly for Variable Inlet Guide Vanes
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Solution Overview
Problem
The integration of variable stator vane assemblies into the casing of gas turbine engines is complex, and existing assembly methods struggle to accommodate various case design philosophies such as ring-case and split-case arrangements effectively.
Innovation Solution
An inner shroud assembly comprising forward and aft core segments, shroud backing plate segments, fastener retainers, and fasteners, which are designed to securely attach and align the inner trunnion of variable vanes, providing structural support and preventing rotation and gas impingement, while allowing for modular assembly and enhanced production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional integration methods are used for variable stator vane assemblies, then structural support is provided, but assembly complexity increases and adaptability to different case designs is reduced
Solution Approach 1:
The inner shroud assembly is divided into multiple segments (forward core segments, aft core segments, shroud backing plate segments) that can be assembled modularly. Each segment contains integrated mounting features for variable stator vane assemblies, allowing the structure to be built in manageable sections rather than as a single complex piece.
Solution Approach 2:
The inner shroud assembly design incorporates universal mounting features and interfaces that can accommodate different case design philosophies (ring-case, split-case arrangements). The segments are designed with standardized connection points and structural characteristics that provide consistent structural support across various engine configurations.
2Productivity
If modular assembly is implemented, then productivity and ease of manufacture improve, but assembly precision and structural integrity may be compromised
Solution Approach 1:
The assembly is segmented into modular units that can be manufactured and prepared independently, then assembled together. Each segment includes integrated mounting features that ensure precise positioning of variable stator vane assemblies during the modular assembly process.
Solution Approach 2:
Multiple functions are merged into each segment: structural support, alignment features, mounting interfaces, and protection against gas impingement are all integrated into single modular units. This consolidation ensures that precision requirements are met while maintaining assembly efficiency.
3Reliability
If comprehensive protection features are added, then reliability against gas impingement and fastener abrasion improves, but device complexity increases
Solution Approach 1:
Protection features are merged with the primary structural components. The shroud backing plate segments and core segments simultaneously provide structural support and protection against gas impingement, while fastener retainers are integrated into the segment design rather than added as separate components.
Solution Approach 2:
Each segment design incorporates multiple protective functions: gas impingement protection, fastener abrasion protection through integrated retainers, and structural support. These multi-functional segments reduce overall complexity by eliminating the need for separate protection systems.
Data Source
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AI summary
An inner shroud assembly (60) includes an aft core segment (66) mountable to a forward core segment (64) to support a multiple of vanes (44) for rotational movement relative thereto. A shroud backing plate segment (68) is engageable with the aft core segment (66). At least one fastener (72) passes through the shroud backing plate segment (68), to retain the aft core segment (66) to the forward core segment (64).