Estimation of the Reliability of Automatic Axial-balancing Devices for Multistage Centrifugal Pumps

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.

Devising a method for ensuring the reliability of fire centrifugal pumps while reducing their weight and dimension characteristics by optimizing their structural elements

“…The reliability of individual elements was considered in work [9]. In particular, its authors assessed the reliability of automated axial balancing for multistage centrifugal pumps.…”

Reduction Gearbox Motion Transmission Using a Crankshaft and Bellows

“…One end of the bellows (6) is firmly attached to the rolling wheel (2) with external toothing, in a coaxial arrangement, while the other end of the bellows (6) is firmly attached to the output wheel (7) in a coaxial arrangement. The output shaft (8) is firmly inserted into the output wheel, in the rotary position inside the output bearing (9) [12], [14].…”

Ensuring the Vibration Reliability of Rotors Connected by Spline Joints

“…In research papers [4][5][6][7], examples of the introduction of neural network technology in computer calculation in solving problems of increasing vibration reliability are described for various rotary machines. Methods of nonlinear identification of stiffness characteristics of bearing supports were also developed in the works [8,9,10]. Upto-date trends in the field of rotor dynamics analysis are discovered in the research papers [11,12,13].…”

“…, (7) where the arbitrary coefficient of the matrix W is defined by the formula: (8) The complex matrix equation 4corresponds to the real matrix equation: (9) where the columns of vectors Y and D are determined by equations (5), (6). The linear regression formula can be implemented in the resulting equation (8).…”