Turbo-Engine Stator Blading Mounting via Machined Receptacles
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Solution Overview
Problem
Existing stator blading systems in turbo-engines are difficult to mount accurately due to the need for perfectly contiguous blade platforms and varying blade orientations, which complicates the assembly process and can lead to errors and reduced leak-tightness and rigidity.
Innovation Solution
A stator blading system with individual machined receptacles on the ring that are complementary to the blade platforms, allowing for simple and accurate mounting of identical blades with varying orientations, ensuring precise positioning and orientation without human error, and reducing the risk of fretting corrosion through recessed surface portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If blade platforms are used to delimit the flow section and are fastened to the ring, then the blading can be assembled, but the mounting becomes difficult and error-prone when blades have different orientations
Solution Approach 1:
The ring is segmented into multiple individual receptacles, each designed to receive a specific blade platform. This segmentation allows each receptacle to be independently machined with precise geometry complementary to its corresponding platform, enabling accurate mounting of blades with different orientations without requiring complex manual alignment procedures
Solution Approach 2:
The receptacles are created as precise copies or negative impressions of the blade platforms through machining operations. Each receptacle is machined to have a form that is exactly complementary to its corresponding platform, ensuring perfect fit and accurate positioning. This copying approach eliminates mounting errors by making the receptacle-platform interface self-aligning
2Adaptability or versatility
If multiple different blades with varying orientations are used, then the aerodynamic constraints can be met, but the mounting complexity increases significantly
Solution Approach 1:
Each receptacle is given a unique local quality or specific geometry that is complementary to its corresponding blade platform. This local customization of receptacle shapes allows blades with different orientations and configurations to be accurately mounted in their specific positions around the ring, while the overall system remains manageable through standardized receptacle manufacturing processes
3Strength
If blade platforms are made thicker or with bosses for external screw insertion, then the fastening is stronger, but the weight and dimensions of the blading increase
Solution Approach 1:
Instead of inserting screws from the outside of the ring through bosses on the platforms, the fastening approach is inverted: threaded rods are inserted from inside the ring through receptacles, and nuts are fastened on the outer surface. This inversion eliminates the need for thick platforms with bosses, reducing the weight and dimensions of the moving blading components while maintaining strong fastening capability through the internal threaded rod-nut connection
Data Source
AI summary
A turbo-engine stator blading is disclosed. The turbo-engine stator blading includes a crown of fixed blades mounted on a ring. Each blade includes a platform and each blade is fastened to the ring. The ring includes a plurality of individual receptacles for the each of the platforms, the receptacles being machined in the thickness of the ring, the form of each receptacle being complementary to that of the corresponding platform. By means of the receptacles, the mounting of the blades within the blading is both simple and accurate.