Abstract
At present, there are theoretical and experimental studies of such bearings without taking into account the elastic deformation of the bearing segments. The rotor bearings of powerful turbines at nuclear power plants are subjected to loads as high as tens of tons. One of the important issues in designing segmental bearings operating under these conditions consists in taking into account elastic deformations of the segments. A schematic diagram of a segmental hydrostatic bearing was presented and the principle of its operation was described. When determining the deformation of spherical support, a formula of change in volume of a solid steel ball subjected to uniform pressure was applied. To determine the segment deformation in the axial direction, differential equation of bending of the strip beam as the initial one. The basic equation of deformation of rods with a curved axis acting in the plane of curvature was taken as a starting point of determining the segment deformation in the circumferential direction. It was found in the studies that the maximum deformation of the segment is 4.5 % of radial clearance at a feed pressure of 5 MPa and can affect the bearing characteristics. A substantially nonlinear character of deformations along the segment axis was revealed. It was found that the pressure of the working fluid significantly affects the segment thickness. With an increase in feeding pressure from 1 MPa to 10 MPa, the thickness of the steel segment increased more than 2 times and the thickness of the bronze segment increased more than 3 times. It was established that the pressure of the working fluid exceeding 10 MPa substantially affects the deformation of the spherical support and the bearing clearance. The study results will make it possible to determine more accurately the main characteristics of the segmental bearing and design it more efficiently.
Highlights
High reliability and durability in all operating modes are some of the main requirements for bearings
It was found in the studies that the maximum deformation of the seg ment is 4.5 % of radial clearance at a feed pressure of 5 MPa and can affect the bearing characteristics
As a result of the analysis of deformation of the segment and its spherical support, it can be noted that total clearance between the shaft and the bearing increases significantly because of segment deformation at certain pressures of the working fluid feed
Summary
High reliability and durability in all operating modes are some of the main requirements for bearings. Non-stationarity of loading, high rotational speeds of rotors, the possibility of the appearance of elastic deformations in segments, and the use of low-viscosity liquids as a lubricant are the main operating features of rotor bearings in power plant units. Taking into account peculiarities of operation of rotor bearings in presentday power plant units, a bearing with self-aligning segments is the most reliable type of bearing that counteracts the excitation of vibrations. 4/7 ( 112 ) 2021 segmental bearings operating in such conditions It is especially important in designing large-diameter segmental bearings. The need to use segmental hydrostatic bearings for rotors of high-capacity plants and the lack of information on determining deformation of segments and their supports makes relevant the study on this problem
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