Abstract: In order to improve the accuracy and reliability of the scroll compressor rotor system, the multi-rigid body and rigid-flexible coupling model of rotor for scroll compressor with joint clearances were established by means of software ADAMS and ANSYS. Effects of the flexible drive bearing and joint clearances on the dynamic performance of the rotor system with overturn of orbiting scroll was simulated and analyzed, and on the basis of which the bearing eccentric worn area is analyzed by finite element method. Results from the finite element analyses show that under the clearance of the moving pair, the flexibility of the bearing has little influence on the displacement and speed of the bearing, but has a great influence on the acceleration and collision force of the bearing. The maximum acceleration is about 13.34 times that of the multi-rigid body model, and the maximum collision force increases by 2.9 times. The bearing has partial wear area in the range of 31.29° behind the exhaust angle, and the maximum stress occurs at 2/7 of the needle roller. The simulation results provide analytical method and theoretical guidance for design and dynamic behavior prediction of scroll compressor.

Key words: scroll compressor, rigid-flexible coupling, drive bearing, joint clearance, overturn of orbiting scroll, dynamic simulation