Stress analysis of screw connection of key structural components in pump turbine

Abstract

Abstract In the structure of water pump turbine unit, the top cover and the seat ring structure are the key structural components, and the high-strength bolts distributed in the circumferential direction are usually used to connect. With the increase of the unit capacity and size, the number of connecting bolts is increasing gradually, so as to ensure the effective connection of key structural components. Taking a mixed flow pump turbine of a pumped storage power station as an example, the finite element calculation of the joint screw pair structure of the head cover and the seat ring is carried out under different working conditions. The stress distribution law of the screw pair is studied in this paper, which provides important theoretical basis and design reference for the practical engineering application of the head cover ring connection of the pump turbine.