DOI 10.21440/2307-2091-2017-2-75-77 Publication Date 11.07.2017
Evaluation of the stress-strain state of shafts of mine section pumps pdf
S. A. Timukhin, E. O. Churakov, A. O. Islent'ev
The authors consider mine sectional centrifugal pumps, in particular, features of the stress-strain state of the shafts of two-flow and single-flow pumps. Due to the development of mine sectional dual-flow pumps, there is a need for a comparative evaluation of the stress-strain state of the shafts. Such an assessment should precede the development and construction of a pump design of any series, since sufficient strength and stiffness of the shaft ensure a stable operation of the pump rotor, and consequently the entire pump unit as a whole. The article presents the stresses of three components: the stresses from bending, torsion and axial force. The authors separately consider the stresses from the axial force for two variants of the pump impellers being fit on the shaft. With loose fit, the stresses from the axial force are distributed evenly over the entire length of the shaft, and with interference fit tensions increase stepwise depending on the number of impellers. In double-flow pumps, the axial force will be half that in comparison with similar single-flow pumps. For interference fit, the nature of tension stresses differs significantly. The authors present equivalent shaft stresses of the pump types under consideration. The authors carried out a comparative evaluation of the equivalent stresses of single-flow and double-flow centrifugal section pumps on the example of CNS-300-600 and CNSD-600-300 pumps. Estimates show that equivalent stresses are lower in CNSD pumps than in CNS pumps, which indicates more favorable operating conditions for their shafts and that the design of dual-flow pumps is more perfect.
Keywords: centrifugal pumps; shaft; stress-strain state; comparative evaluation; equivalent stresses.
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