Rotor Balance Adjustment for Large Impellers
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Solution Overview
Problem
Existing rotor balance adjustment methods are inadequate for accurately adjusting the balance of rotors with large-sized impellers, leading to increased vibrations due to the dominant influence of these impellers, even if balance tests show no issues.
Innovation Solution
A rotor balance adjustment method that involves separately adjusting the weight of each impeller before attachment, followed by inclination adjustment of the large-sized impeller, and subsequent adjustment of the rotor's center of gravity without altering the large-sized impeller's weight, by processing other impellers to achieve precise balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large-sized impeller is attached to the rotor, then the rotor can achieve desired output performance, but the balance of the rotor becomes highly sensitive to small changes in the impeller's center of gravity position and inclination
Solution Approach 1:
The patent applies preliminary action by performing balance adjustment on each impeller separately before attaching them to the rotor. This preliminary balancing ensures that when the large-sized impeller is attached, its influence on rotor balance is minimized because other impellers are already balanced individually, reducing the sensitivity to small center of gravity changes during final rotor assembly
Solution Approach 2:
The patent segments the balance adjustment process into distinct stages: individual impeller balance adjustment before attachment, and final rotor balance adjustment after assembly. This segmentation allows each impeller to be balanced independently, isolating the large-sized impeller's influence and enabling more precise control over the overall rotor balance
2Productivity
If conventional balance adjustment methods are used for rotors with large-sized impellers, then the number of processing steps is reduced, but vibrations increase during actual operation due to insufficient balance accuracy
Solution Approach 1:
The patent performs preliminary balance adjustment on each impeller before attachment to the rotor. This preliminary action ensures that when the rotor is assembled, the majority of balance corrections have already been made, reducing the need for extensive post-assembly adjustments and minimizing vibrations during operation
Solution Approach 2:
The patent employs feedback by measuring vibrations during balance tests and using this information to guide further adjustments. The balance adjustment process is iterative, with each measurement providing feedback on whether additional corrections are needed, ensuring vibrations are reduced to acceptable levels before final assembly
Data Source
AI summary
A rotor balance adjustment method includes: an impeller adjustment process of adjusting, with respect to each of the plurality of impellers, a balance of a position of the center of gravity of the impeller by separately adjusting a weight of the impeller before being attached to the rotor main body; a fixing process of fixing the plurality of impellers to the rotor main body after the impeller adjustment process is performed, wherein the plurality of impellers comprises a large-sized impeller that is larger and heavier than the other impellers; an inclination adjustment process of adjusting an inclination of the large-sized impeller with respect to the rotor main body after the fixing process is performed; and a rotor adjustment process of adjusting a balance of a position of the center of gravity of the rotor.