Multi-part Guide Vane Adjusting Device for Turbomachines
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Solution Overview
Problem
Existing guide vane adjusting devices for turbo machines face challenges in rotating multi-part guide vanes with minimal friction and torsional loading, which affects efficiency and flow pressure losses.
Innovation Solution
A guide vane adjusting device where each guide vane comprises a front and rear vane part rotatable about a common axis, with a driveshaft directly coupled to one vane part and indirectly coupled to others via a control ring, using drive levers and a coupling device to enable synchronous rotation with low friction and torsional loading, and a control ring that is displaceable in circumferential and axial directions to avoid parasitic forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-part guide vanes are used to reduce flow pressure losses and increase efficiency, then the efficiency is improved, but the friction and torsional loading increase when rotating the guide vanes
Solution Approach 1:
The guide vane is divided into multiple parts (front vane part and rear vane part) that can rotate independently about a common axis. This segmentation allows each part to be optimized for its specific function while reducing overall friction and torsional loading during rotation, thereby maintaining high efficiency with lower energy losses.
Solution Approach 2:
A control ring is introduced as an intermediary element between the driveshaft and the guide vane parts. The control ring transmits rotational motion while distributing and reducing the torsional loading on individual components, enabling smooth rotation with minimal friction and energy loss.
2Ease of operation
If a control ring is used to transmit rotation to all guide vanes, then the guide vanes can be adjusted, but parasitic forces and additional friction are introduced
Solution Approach 1:
The control ring is designed to be displaceable in circumferential and axial directions rather than being rigidly fixed. This dynamic design allows the control ring to adapt to rotational movements and distribute forces more evenly, minimizing parasitic forces and friction during guide vane adjustment while maintaining ease of operation.
3Device complexity
If guide vanes are embodied in one piece, then the structure is simple, but flow pressure losses increase and efficiency decreases
Solution Approach 1:
The guide vane is segmented into multiple parts (front vane part and rear vane part) that rotate about a common axis. This segmentation improves flow characteristics and reduces pressure losses, enhancing efficiency while maintaining a relatively simple overall structure through the use of a common rotation axis and control mechanism.
Data Source
AI summary
A guide vane adjusting device for rotating guide vanes in a guide vane assembly having a driveshaft and a control ring that transmits a driveshaft rotation of the driveshaft to rotate the guide vanes. Each guide vane has a front and a rear vane part, which can be rotatable relative to each other about a respective guide vane rotational axis. The driveshaft is directly coupled to one of the guide vanes such that the vane parts are directly rotated without the interposition of the control ring. The driveshaft is indirectly coupled to the other guide vanes such that the guide vane parts are rotated indirectly with the interposition of the control ring. A respective drive lever acts on a bearing pin of the front vane part and a bearing pin of the rear vane part of the guide vane. The drive lever are coupled together via a respective coupling device.