Abstract
SummaryA mathematical model of oil free scroll machine working in vacuum conditions is considered. Differential equations and main assumptions in the model are presented. Four types of control volumes are specified. The model takes into consideration heat exchange between the pump working elements, change of clearances due to thermal deformations, and mobility of the scroll element wall in calculation of leakage. The comparison of the calculated values of the pumping speed with experimental values obtained at different rotation speed of the driveshaft is carried out.
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