Abstract: Aiming at the leakage problem between dynamic and static scroll teeth caused by the meshing error of radial flexible scroll compressor, based on the contact dynamics theory and the meshing principle of dynamic and static scroll teeth, the concept of meshing collision impact between dynamic and static scroll teeth is put forward, and the meshing contact impact dynamic model of the scroll compressor is established. Based on Lankarani-Nikravesh nonlinear spring damping impact force model, a contact impact model of radial clearance between dynamic and static scroll teeth considering meshing error excitation is given. The deformation at the meshing point of the two models is calculated by the finite element numerical calculation method to investigate the impact model of scroll compressor under a radial meshing contact impact force. The results show that the deformation of scroll teeth increases with the increase of spindle rotation angle under meshing impact excitation in a compression period. The deformation trend at the meshing point obtained from the meshing contact impact dynamic model is consistent with that obtained from the radial clearance contact impact model of dynamic and static scroll teeth. Furthermore, the impact recovery coefficient in the radial clearance contact impact model of dynamic and static scroll teeth also has some influence on the impact deformation. Therefore, the initial clearance of the meshing point can be determined by controlling the collision recovery coefficient, and a new idea for controlling the radial leakage of the scroll compressor can be provided.

Key words: radial flexibility, displacement excitation, meshing contact shock, transient dynamics