Plastic Variable Inlet Guide Vane for Gas Turbine
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Solution Overview
Problem
Existing variable inlet guide vane systems in gas turbine engines face issues with gear binding and aerodynamic distortion due to misalignment, leading to inefficiencies and reduced ability to dynamically adjust airflow, especially under high load and debris conditions.
Innovation Solution
A plastic variable inlet guide vane system is introduced, featuring an airfoil, outer trunnion, and sector gear made from plastic materials, eliminating the need for a bushing and using a plastic screw for sector gear retention, which reduces friction and wear by utilizing self-lubricating plastic teeth and allowing for easier deformation under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal gears and bushings are used in the variable inlet guide vane system, then structural strength is improved, but friction and wear increase leading to gear binding
Solution Approach 1:
The patent changes the material parameter from metal to plastic for the sector gear and bushing components. This material substitution reduces the coefficient of friction between meshing surfaces, preventing gear binding while maintaining sufficient structural strength through careful selection of plastic materials with appropriate mechanical properties.
Solution Approach 2:
The patent employs composite plastic materials that combine lubricating properties with structural integrity. The plastic sector gear and bushing form a composite system that reduces friction and wear compared to traditional metal-on-metal contact, while still providing the necessary load-bearing capacity.
2Strength
If traditional metal components with bushings are used, then load-bearing capacity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple components (sector gear, bushing, and retaining features) into a single integrated plastic part manufactured by injection molding. This eliminates the need for separate metal bushings and assembly operations, reducing manufacturing complexity while maintaining load-bearing capacity through the plastic material's inherent properties.
Solution Approach 2:
The patent replaces the traditional mechanical assembly of metal components with bushings and fasteners with a monolithic plastic component formed by injection molding. This substitution eliminates complex assembly steps and reduces the number of parts, simplifying manufacturing while preserving structural functionality.
3Reliability
If plastic materials are used for the sector gear and bushing, then friction and wear are reduced, but structural strength decreases
Solution Approach 1:
The patent carefully selects plastic materials with optimized mechanical parameters to achieve the right balance between friction resistance and structural strength. By adjusting material composition, molecular weight, and crystallinity, the plastic components provide sufficient load-bearing capacity while maintaining low friction coefficients for reliable operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design minimizes friction and wear, maintains better gear contact, and enhances the dynamic adjustment of airflow, improving efficiency and preventing distortion, while also simplifying manufacturing through injection molding and other plastic technologies.
Implementation Method 1
a plastic screw that threadingly engages a passage formed through the sector gear and the outer trunnion
Implementation Method 2
reduces friction and wear by utilizing self-lubricating plastic teeth
Data Source
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AI summary
The present disclosure relates generally to the field of variable geometry guide vanes for gas turbine engines. More specifically, the present disclosure relates to a plastic variable inlet guide vane for a gas turbine engine.