Turbine Engine Outer Shroud Segmented Ferrule Design
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Solution Overview
Problem
Existing axial turbomachine designs with adjustable stator blades are often bulky and complex, making assembly and activation mechanisms cumbersome and inefficient, particularly in compressors with fewer stages.
Innovation Solution
A compact design featuring a cylindrical ferrule with a 'T' profile tubular wall and bridles, allowing for direct or indirect contact with a ring, and utilizing screws and sleeves for assembly, along with titanium, aluminum, or magnesium alloy and composite materials for enhanced rigidity and weight optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bulky external ferrule extending over several compression stages is used, then the mechanism can support multiple variable-pitch compression stages, but the device becomes unnecessarily cumbersome in compressors with fewer stages
Solution Approach 1:
The external ferrule is divided into two separate sections: a first section with a cylindrical surface for mounting the actuation device, and a second section extending over the compression stages. This segmentation allows the ferrule to be adapted to compressors with fewer stages by using only the necessary portion, reducing complexity while maintaining versatility.
Solution Approach 2:
The ferrule design extends in the axial dimension to cover multiple compression stages, allowing the same structure to accommodate variable-pitch blades at different axial positions. This dimensional approach enables a single ferrule design to support compressors with different numbers of stages.
2Reliability
If a traditional actuation device mounting approach is used, then the mechanism can function, but the overall assembly becomes bulkier and less compact
Solution Approach 1:
The actuation device is merged with the external ferrule structure itself. The cylindrical surface of the first ferrule section serves directly as the mounting surface for the actuation device, eliminating the need for separate mounting structures and reducing overall assembly volume.
3Strength
If conventional materials are used for the ferrule and actuation device, then manufacturing is simpler, but the assembly lacks sufficient rigidity and weight efficiency
Solution Approach 1:
The patent specifies using titanium, aluminum, or magnesium alloys and/or composite materials for the ferrule and actuation device components. These materials provide high strength-to-weight ratios, ensuring sufficient rigidity while minimizing weight compared to conventional materials.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
The invention relates to a turbine engine (2) compressor shroud, comprising: first and second sections (130, 230) and respective flanges (131, 231), the flanges (131, 231) making it possible to hold the two sections (130, 230) together, the first section (130) comprising a cylindrical surface (137) forming a seat for an actuating device (136, 140, 166, 168, 170) for orienting stator blades (126), characterised in that the first shroud (130) comprises a tubular wall (132) axially overlapping both flanges (131, 231) and said cylindrical surface (137) is an outer surface of the tubular wall (132). The invention also relates to an assembly with the shroud (130, 230), the blade (126) and means (140) for actuating the orientation of the blade (126), the shroud being produced using the kit described above. The invention finally relates to a method for assembling a compressor with such an assembly.