Study of volute cutwater diameter on the structural strength of pump rotor

Abstract

Based on the Workbench platform, temperature and pressure loads are applied to the rotor system (impeller, pump shaft and impeller nut) in high temperature hot water circulating pump when the medium temperature is 150 ° C. The corresponding boundary conditions are defined, and steady-state thermal analysis and static analysis are carried out. The temperature distribution, the equivalent stress and the total deformation of the rotor system is discussed in detail when the volute cutwater diameter is 214mm, 216mm and 218mm. The results show that the deformation of impeller, pump shaft and impeller nut has the maximum value when cutwater diameter is 216mm. With the increasing of cutwater diameter, the minimum temperature and maximum equivalent stress of the impeller decreases gradually. There is an obvious stress concentration in the shaft shoulder which is from bearing fitting section to the maximum shaft diameter.