Star Wheel Tooth Profile Design for Compressor Wear Reduction
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Solution Overview
Problem
Existing methods for designing the profile of star wheel teeth in single-screw compressors independently address the front and back flanks, leading to uneven liquid film bearing performance and increased abrasion on one flank.
Innovation Solution
A collaborative design method for the profile of both flanks of the star wheel tooth, using geometric representations and cylindrical milling cutters to achieve conjugate meshing and optimal oil film thickness, ensuring balanced wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the profile of the front flank and the back flank of the star wheel tooth are designed independently, then the design process is simpler, but the liquid film bearing performance between the two flanks has great difference causing obvious abrasion on one flank
Solution Approach 1:
The patent merges the independent design of front and back flanks into a unified collaborative design system. The construction method establishes mathematical relationships and geometric constraints that link both flanks together, ensuring they are designed simultaneously rather than independently, thus achieving uniform liquid film bearing performance while maintaining design efficiency
Solution Approach 2:
The patent transforms the design approach by changing from independent parameter selection for each flank to a coupled parameter system. By establishing mathematical formulas that relate the parameters of front and back flanks (such as inclination angles, tooth profiles, and meshing conditions), the design ensures balanced performance across both flanks
2Device complexity
If a single-edge line profile is used on the meshing face, then the structure is simple, but the wear-resistance is insufficient
Solution Approach 1:
The patent transitions from a one-dimensional single-edge line profile to a two-dimensional multi-column envelope profile. By introducing multiple columns (typically three) that envelop the tooth flanks, the profile gains additional geometric dimensions and complexity that significantly enhance wear resistance while maintaining reasonable structural simplicity
Solution Approach 2:
The patent creates a composite geometric structure by combining multiple column envelopes to form the tooth profile. This composite approach, where multiple cylindrical surfaces work together to create the final envelope shape, provides superior wear resistance compared to a single-edge profile
3Manufacturing precision
If multi-column envelope profile is designed without collaborative consideration of front and back flanks, then each flank can be optimized individually, but the association condition and mutual restriction between flanks are not established
Solution Approach 1:
The patent segments the tooth profile into distinct front and back flank regions, each optimized by its own column envelope construction. This segmentation allows individual optimization while the overall collaborative design framework ensures proper association between the segments through established geometric relationships
Data Source
AI summary
A method for collaboratively constructing a column envelope profile of two flanks of a star wheel tooth includes steps of: determining a tooth width B of a star wheel according to a diameter of the star wheel and a dimension of a root circle; thereafter, geometrically representing positions and shapes of the two flanks by two base columns having parallel axes and the same diameter; wherein: the axes of the base columns are parallel with a center line of the star wheel tooth; on a section of a tooth top of the star wheel tooth, a local projection of a first base column close to a front flank is projected on a lowermost part of a projection of the front flank; and a local projection of a second base column close to a back flank is projected on an uppermost part of a projection of the back flank.