Dynamic Analysis of the Asynchronous Compression Cycle for the Rotor in Single Screw Compressor

Aiming at the problems of large resistance torque fluctuation and high noise in the working process of traditional single screw compressor (SSC) with large displacement or large pressure difference, this work proposed an odd-groove structure of screw rotor. Based on the basic principle of mechanics and the working characteristics of SSC, the stress state of screw rotor with odd grooves was analyzed, and the dynamic model was established. The model was used to study the dynamic characteristics of screw rotor with odd grooves in the process of asynchronous compression cycle. The results show that the screw rotor of SSC in the process of asynchronous compression cycle is mainly affected by the radial gas force. The force changes in magnitude, its direction varies continuously along the radial direction of the screw rotor, and the change period is half of the time required to turn the angle between two star-wheel teeth. The equivalent position of the force changes periodically between the center surface of the screw rotor and the exhaust end face, and mutation occurs at the beginning of exhaust. This research may provide a reference for the design and further development of SSC with asynchronous compression. © 2021, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.