Abstract
The permanent increase of operating parameters of modern multistage centrifugal pumps requires more precise modelling for estimation their dynamic reliability and needs to develop new approach and methodology for the related calculations. It is necessary to change the approach assuming empirical coefficients to another one based on the probabilistic design for analysis of reliability for pumps and their nodes. In this case, the probabilistic parameters of the design features and fluid flow are significant for the calculation (e. g. geometry of gap seals, boundary conditions, material properties) and should be considered. The automatic axial-balancing device of the rotor is one of the most important nodes of multi-stage centrifugal pumps. It operates as the balancing disc for the axial force up to 1 MN. This paper presents the methodology for the numerical calculation of the balancing disc and its influence on the reliability of multistage centrifugal pumps. The proposed approach is based on the criterion of the permissible amplitudes of axial oscillations of the rotor with the automatic axial-balancing device considering probabilistic origin of main geometrical, hydromechanical and operating parameters.
Highlights
For balancing of total axial forces in multistage centrifugal pumps, the automatic axial-balancing devices are used
This paper presents the methodology for the numerical calculation of the balancing disc and its influence on the reliability of multistage centrifugal pumps
The amplitude of axial oscillations may exceed the range specified in traditional calculations that leads to the occurrence of dry friction in the axial gap, increases mechanical losses and accelerates wear of rings of the balancing disc
Summary
For balancing of total axial forces in multistage centrifugal pumps, the automatic axial-balancing devices are used. Designing these assemblies requires the possibility of carrying out precise calculations including investigations of their efficiency that affects reliability of the pump. Increasing the reliability of a pumping system is primarily related to the requirements of safety standards following an increase in the operating parameters of these machines. Prevention of unreliability of pumping installations requires raising the standards for the strength, criteria for assessing the dynamic state of machines and their efficiency. The amplitude of axial oscillations may exceed the range specified in traditional calculations that leads to the occurrence of dry friction in the axial gap, increases mechanical losses and accelerates wear of rings of the balancing disc
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