Segmented Compressor Inner Band for Variable Vane Assembly
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Solution Overview
Problem
Conventional methods for assembling variable pitch vane assemblies in gas turbine engines often damage or deform the inner band due to the need to compress it during vane installation, which complicates the assembly process and can lead to permanent deformation.
Innovation Solution
A compressor assembly design featuring an outer band, a plurality of variable pitch vanes, and an inner band with vane mount segments and an inner ring segment that allows the vanes to be assembled without compressing the inner band, using a tongue-and-groove interface and seal members to interlock the vane mount segments with the inner ring segment, facilitating easier assembly and minimizing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional compression methods are used to install vanes, then the vanes can be secured to the inner band, but the inner band becomes deformed or damaged
Solution Approach 1:
The inner band is divided into multiple independent segments that can move relative to each other. This segmentation allows the vanes to be installed without compressing the entire inner band, eliminating the deformation problem while maintaining secure vane attachment through the segmented structure's inherent flexibility.
Solution Approach 2:
The inner band transitions from a static, rigid structure to a dynamic, flexible structure where segments can move independently. This dynamic capability allows the inner band to accommodate vane installation without permanent deformation, as the segments can flex and return to their original positions.
2Ease of operation
If the inner band is compressed during assembly, then the vanes can be installed, but the assembly process becomes more complex and time-consuming
Solution Approach 1:
By segmenting the inner band, the assembly process no longer requires compression operations. Each segment can be independently positioned and secured, simplifying the installation procedure and reducing assembly time compared to traditional compression methods that require specialized tools and multiple steps.
Solution Approach 2:
The inner band segments are pre-configured with attachment features that enable direct vane installation without prior compression. This preliminary preparation of the segmented structure eliminates the need for time-consuming compression operations during assembly.
3Strength
If a rigid inner band structure is used, then structural integrity is maintained, but assembly deformation occurs
Solution Approach 1:
The inner band is segmented into multiple rigid sections that maintain individual structural integrity while allowing relative movement between segments. This segmentation enables the overall structure to remain strong while accommodating assembly operations without deformation.
Solution Approach 2:
Multiple rigid segments are combined to form the complete inner band structure. Individually, each segment maintains its structural integrity, and collectively they provide the necessary strength while allowing flexible assembly through their interconnections.
Data Source
AI summary
A compressor assembly for a gas turbine engine includes an outer band, a plurality of variable pitch vanes, and an inner band. The plurality of variable pitch vanes extend radially between the outer band and the inner band. The inner band extends circumferentially partway about an axis and includes an inner ring segment formed to define a channel and a plurality of vane mount segments interlocked with the inner ring segment in the channel.