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

A technology for fixing bolts and impeller blades, which is applied in the field of fatigue life prediction of impeller blade fixing bolts of horizontal semi-adjustable axial flow pumps, and can solve the problems of easy fracture of blade fixing bolts and low fatigue life

Inactive Publication Date: 2020-07-24
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0175] Below in conjunction with embodiment, the present invention is further invented:

[0176] A horizontal semi-regulated axial flow pump in a pumping station, with an impeller diameter of 1.45m, a head of 1m, and a flow rate of 5m 3 / s, the speed is 218r / min, the number of blades is 4, and the weight of a single blade is 86.2kg. The stiffness coefficients of the pressure plate, hub, flange and bolts are shown in Table 7; the blades are made of stainless steel 2Cr13, and their material properties are shown in Table 8.

[0177] Table 7 Stiffness coefficient of pressure plate, hub, flange and bolt

[0178]

[0179] Table 8 Material properties of 2Cr13

[0180]

[0181] A. Three-dimensional modeling and grid division of the flow field calculation area of ​​the horizontal semi-regulated axial flow pump;

[0182] The three-dimensional modeling of the calculation area of ​​the pump flow field is carried out through UG, including the water inlet pipe, guide vane, and outl...

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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...

Claims

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Application Information

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IPC IPC(8): G06F30/23G01M13/00G06F111/10G06F119/14
CPCG01M13/00
Inventor 仇宝云苏保铭周钰林张金龙盛林华黄先北董媛媛刘木秀
Owner YANGZHOU UNIV
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