Finite element analysis of sealing chambers in a single-screw pump

摘要

Sealing chambers are formed by stator-rotor interference fit contact in a single-screw pump. The contact pressure distribution and the width of sealing tape between the stator and the rotor in the sealing chambers are critical to both sealing performance and transport performance of the singlescrew pump. In this paper, based on the forming mechanisms of the sealing chamber in a single-screw pump, 3D entity models of the stator and the rotor in the single screw pump were built using commercial Pro/E code. In addition, the contact pressure distribution between the stator and the rotor in working chamber of the single-screw pump was studied using finite element method. The relationships between contact pressure and the width of sealing tape with wear and backflow were discussed. The results show that the leakage for the single screw pump in chamber 2 may occur through one end of circular arc segment and spiral segment. It is found that the most serious wear during operation for the single screw pump could occur in circular arc segments or middle areas of spiral segments. The results may be useful in optimal design of singlescrew pumps.