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The working process of an oil‐free claw vacuum pump
Author(s) -
Raykov A.,
Salikeev S.,
Burmistrov A.,
Alyayev V.,
Fomina M.
Publication year - 2017
Publication title -
vakuum in forschung und praxis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.213
H-Index - 13
eISSN - 1522-2454
pISSN - 0947-076X
DOI - 10.1002/vipr.201700643
Subject(s) - mechanics , claw , vacuum pump , inlet , suction , rotational speed , rotor (electric) , progressive cavity pump , centrifugal pump , mechanical engineering , control theory (sociology) , variable displacement pump , engineering , physics , reciprocating pump , impeller , control (management) , management , economics
Mathematical model of oil free claw vacuum pump is presented. The model is based on energy balance differential equations of thermodynamic system of variable mass working body. Using the equations of coordinates transformation and contact line of rotors continuity condition, equations for geometry of claw pump working chamber on condition of rotors point connection are obtained. To evaluate the leakage through the rotor mechanism channels, their existence graphs are plotted and geometric parameters of the channels depending on rotors position are determined. As a result of modeling, dependence of pressure and temperature in suction and compression‐discharge chambers on rotation angle at different rotary speeds and on different inlet pressures and relationship between pumping speed and inlet pressure are obtained. The comparison between calculated values and experimental data obtained for one‐stage claw pump with identical rotors is carried out. The maximal difference between the calculated and experimental values does not exceed 15 %. The developed mathematical model is recommended for analysis of influence of rotors geometry on the working process parameters and pumping characteristics of an oil free claw pump.