Involute Profile Modification Using Multi-Pairs of Circular Arcs in the Starting Part for Scroll Compressors

In order to improve the overall performance of scroll compressors, a profile modification method using multi-pairs of circular arcs in the starting part, which can generate perfect meshing profile, is proposed for the first time. Through the analysis of the modified wrap using twin-pairs of circular arcs, n pairs of circular arcs modified wrap's generating method, general mutual dependence of geometric parameters as well as equations of modification circular arcs are obtained. Compared with the conventional profile modification method using a single pair of circular arcs, this method effectively increases the compression ratio and strength in the starting part of modified wrap at the same time. The investigation results can be used directly in the design of profile modification, and the proposed conditions of taking circular arcs as wrap profile enrich the geometric theory of meshing wraps.