Dynamic modeling and characteristics analysis of sliding vane in a high-speed rotary compressor considering groove distribution and multi-body coupling

Abstract

As one significant component in high-speed rotary compressors, sliding vane undergoes complex motions within the vane slot. The requirements for high-performance compressors result in the applications of low-viscosity lubrication techniques and high working frequency, thus worsening the operation conditions of the vane. To investigate the service performance of the sliding vane, a new tribo-dynamic model considering groove distribution and multi-body coupling is established in this study. Based on the solution with the modified extended backward differentiation formulae (MEBDF), the tribo-dynamic behaviors of the vane-related friction pairs are revealed. After comparison, the optimal scheme of the vane width is determined as 3.188 mm, with which the maximum wear load of the vane slot on the suction side is reduced obviously and the wear volume changes little. With the conical structure scheme of Lcs=1.5mm and hcs=1μm, the maximum wear load of the vane slot can be greatly reduced, thus increasing the wear uniformity. To improve the operation performance of the vane-slot conjunction, the lower suction pressure is suggested. This work provides comprehensive information for manufacturers to understand the working state of the sliding vane and conduct the optimal design.