Multi-field coupling analysis and comparative testing of miniature involute scroll plates with varied base circles

Miniature scroll compressors are the key devices for portable oxygen generation, micro-refrigeration, and surgical applications, etc. The scroll plate working as the core component, directly determines the compressor’s sizes and performances. However, limited research on it constrains the development of high-end miniature scroll compressors. In this study, the traditional involute scroll plate S0 serves as the baseline for constructing two optimized scroll plates S1 and S2 with varied base circle. S1 is designed to increase flow rate while maintaining the same size and S2 is designed to reduce size while maintaining the same flow rate. To explore how this optimization affects the stiffness of the scroll plates and the compressor’s volumetric efficiency, multi-field coupling analyses on S0, S1, and S2 have been conducted based on the finite element method. Scroll wraps deformation and von-Mises stress levels are used as stiffness indicators to compare the three structures. Then, corresponding prototypes are fabricated, and experimental tests are conducted to compare the actual flow rates and volumetric efficiencies of the three plates. The results indicate that using the involute with varied base circle as the scroll profile allows for both size reduction and flow rate enhancement, while also improving the stiffness of the scroll plates and its volumetric efficiency. It will significantly enhance the overall performance of the miniature compressor.