Method for predicting fatigue life of horizontal semi-adjusting axial flow pump impeller blade fixing bolt

Abstract

The invention discloses a method for predicting the fatigue life of a horizontal semi-adjusting axial flow pump impeller blade fixing bolt, belongs to the technical field of reliability and durabilityof power mechanical equipment, and aims to predict the fatigue life of a fixing bolt of a blade and a hub under the combined action of circumferential resistance, radial centrifugal force, axial water pressure and gravity of water when the horizontal semi-adjusting axial flow pump operates. The method comprises the steps of flow field numerical simulation in a pump device and impeller blade stress calculation. According to deformation coordination conditions of the blade fixing bolt, the blade root flange, the impeller hub and the pressing plate, the dangerous section stress of the blade fixing bolt is calculated, and a fatigue load spectrum is determined; and finally the fatigue life of each fixing bolt is calculated and determined. The fatigue life of the horizontal semi-adjusting axialflow pump impeller blade fixing bolt can be accurately predicted, and the method has important theoretical significance and practical application value for improving the blade root structure and connection fixing design, reasonably determining the replacement period of the fixing bolt and improving the operation reliability of a water pump.

Description

technical field [0001] The invention belongs to the technical field of reliability and durability of power mechanical equipment, and relates to a method for predicting the fatigue life of a horizontal semi-adjustable axial flow pump impeller blade fixing bolt, in particular to a water pump when the horizontal semi-adjustable axial flow pump is running. The impeller blade is subjected to the combined action of water circumferential resistance, radial centrifugal force, axial water pressure and blade gravity, and the prediction method of the fatigue life of the fixing bolts between the blade and the hub. Background technique [0002] Axial flow pumps have the characteristics of low head and large flow, and are widely used in many fields such as farmland irrigation, drainage, urban water supply and drainage, and flood control. Small and medium-sized axial flow pumps and some large axial flow pumps use semi-regulating impellers. The blades of the impeller are inserted into the p...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems that the blade fixing bolts of the semi-regulating axial flow pump are easy to break and the actual fatigue life is lower than the design life, the present invention proposes a method for predicting the fatigue life of the impeller blade fixing bolts of the horizontal semi-regulating axial flow pump

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