Study on the performance prediction of screw vacuum pump

Pumping characteristics of the screw vacuum pump were investigated. The aim of this study was to establish a method of the performance prediction and a way to design the pump that satis®es speci®c requirements. The performance was analysed by the balance among geometrical pumping speed, net throughput and leaks. The leaks ¯ow through clearances between a screw rotor and a stator, and clearances between two meshing rotors. These leaks were estimated with the results based on the linearised BGK model and the ¯ows through ideal labyrinthes. Experiments were carried out by rotors of 120 mm diameter, and pumping speed and ultimate pressure were measured. The comparison between the measurements and the predicted values shows that the present method predicts the performance of the screw pump with a suf®cient accuracy for practical applications. # 2001 Elsevier Science B.V. All rights reserved.