Conical Balance Weight Assembly for Rotor Positioning
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Solution Overview
Problem
Existing rotor balancing methods face inaccuracies due to uncertainties in weight positioning and are unsuitable for rotors with small diameters, leading to potential stress concentrations and reduced service life.
Innovation Solution
A balance weight assembly featuring a pre-fixing screw with a conical head that passes through a conical counterbore in the flange, ensuring precise positioning and secure fixation, even in tight spaces, using threaded studs with clamping nuts and scalloped flanges to alleviate stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If weights are fixed using conventional methods, then the rotor can be assembled, but the position of the weight is inaccurate
Solution Approach 1:
The conical counterbore is prepared in advance in the flange, and the conical head of the fixing screw is designed to fit into it. This preliminary preparation of the seating surface ensures that when the screw is tightened, the weight is positioned with high precision relative to the rotor element, eliminating positioning inaccuracies of conventional flat-head screws.
2Volume of moving object
If the rotor elements have small diameter, then the rotor size is reduced, but the overall dimension of the weight becomes unacceptable
Solution Approach 1:
The conical head of the fixing screw is nested within the conical counterbore of the flange. This nesting arrangement allows the screw head to be received within a recess rather than protruding outward, enabling the weight to be positioned closer to the rotor surface and reducing the overall radial dimension of the rotor assembly.
3Device complexity
If conventional fixing screws are used, then the assembly is simple, but stress concentrations occur at the drilling locations
Solution Approach 1:
The conical counterbore is prepared in advance in the flange at the drilling location. This preliminary preparation allows the conical head of the screw to be received within the counterbore, distributing the stress over a larger area and avoiding stress concentrations at the drilling location, while still maintaining a relatively simple fixing mechanism.
Data Source
AI summary
The balance weight is fixed to the flange of a rotor element by a pre-fixing screw with a conical head engaged into a conical counterbore having a shape complementary to the flange, which places the weight at a very accurate position before permanently fixing it by a clamping stud.