Turbomachine Drum Positioning Device Prevents Blade Malposition
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Solution Overview
Problem
Guide blade groups in turbomachines often malposition due to recesses on the inner circumference of the drum, leading to undetected faulty positions and potential damage during operation.
Innovation Solution
A device with depth-reduced inner circumferential sections between receptacles prevents malpositioning by ensuring guide blade groups are aligned correctly, meeting lightweight construction and structural mechanics requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If recesses are provided on the inner circumference side of the drum to reduce weight and optimize structural mechanics, then weight reduction and structural optimization are achieved, but guide blade groups may malposition by immersing holding elements into the recesses, feigning setpoint positions
Solution Approach 1:
The patent applies local quality by creating depth-reduced inner circumferential sections at specific locations between receptacles, while maintaining recesses at other locations. This localized modification provides positioning prevention exactly where needed without compromising the overall weight reduction and structural optimization benefits of the recesses throughout the drum structure.
Solution Approach 2:
The depth-reduced inner circumferential sections serve as preliminary anti-action measures by pre-preventing malpositioning before it can occur. These sections create physical barriers that stop holding elements from immersing into recesses, thereby preventing faulty positioning feints before they can cause damage during turbomachine operation.
2Manufacturing precision
If depth-reduced inner circumferential sections are added to prevent malpositioning, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
Rather than making the entire drum structure complex, the patent applies local quality by introducing depth-reduced sections only at specific strategic locations between receptacles. This localized approach improves positioning precision without requiring complex modifications throughout the entire drum structure, maintaining relative simplicity while achieving the positioning prevention goal.
3Strength
If recesses are provided between axial grooves to optimize the drum structurally, then structural mechanics are optimized, but faulty positioning goes undetected leading to considerable damage during operation
Solution Approach 1:
The patent maintains recesses in locations where they provide structural benefits while applying local quality by adding depth-reduced inner circumferential sections at specific locations between receptacles. This selective modification preserves structural strength where recesses are needed while preventing malpositioning at critical locations, thereby maintaining structural integrity while improving operational reliability.
Solution Approach 2:
The depth-reduced sections provide preliminary anti-action by preventing malpositioning before it can lead to undetected faulty positions and subsequent damage. This proactive measure ensures that even though recesses remain in the structure for mechanical optimization, they cannot be exploited for malpositioning, thus protecting turbomachine reliability.
Data Source
AI summary
A device such as a drum for positioning at least one guide blade row from a plurality of guide blade groups in a turbomachine, the device on the outer circumferential side including at least one flange for attachment to a housing section of the turbomachine and on the inner circumferential side including a plurality of uniformly distributed receptacles for accommodating holding elements of the guide blade groups and a plurality of recesses, the device having a depth-reduced inner circumferential section, relative to the accommodating grooves, between at least two adjoining receptacles, which extends in each case from the one receptacle to the other receptacle; a blade-device combination; a method for assembling such a blade-device combination; and a turbomachine.