Radial sliding bearing

Abstract

The invention relates to a radial sliding bearing, which comprises a main shaft, an upper bearing liner and a lower bearing liner, and is characterized in that the inner wall of the lower bearing liner of the radial sliding bearing is formed by jointing three arcs, radiuses of the three arc are set to be equal or unequal; opposite to the bearing center and along a main shaft rotation direction, a preset eccentric distance of the first arc is more than preset eccentric distances of the second arc and the third arc; the preset eccentric distances of the second arc and the third arc are the same; the circle center of the second arc is positioned on a vertical direction of the bearing; after pressure distribution characteristics and thickness distribution characteristics of design requirements are defined, an included angle formed by a connection line of the first arc circle center and the bearing center with the bearing vertical line and an included angle formed by a connection line of the third arc circle center and the bearing center with the bearing vertical line can be calculated according to an oil film thickness formula (1) and a Reynolds equation (2); after the included angles of every arc are defined, the preset eccentric distances of the arcs can be calculated according to the thickness calculation formula and oil film wedge shape requirements, such that the three non-concentric arcs form three continuous wedge oil films having similar shapes and the same oil film thickness during the operation process so as to achieve a multi-oil wedge bearing effect, such that the original elliptical or cylindrical sliding bearing can be lowered.

Description

technical field [0001] The invention relates to a radial sliding bearing for a horizontal water turbine generator set, in particular to a radial sliding bearing used in a heavy load and low-speed unit. [0002] Background technique [0003] The radial sliding bearing is a dynamic pressure sliding bearing. When the main shaft is running, the wedge-shaped oil film formed on the outer surface of the main shaft and the inner surface of the bearing bush generates dynamic pressure, so that the resultant force of the dynamic pressure is balanced with the bearing load. This type of bearing has the advantages of large load capacity and wide application range, and is widely used in hydroelectric generators, steam turbine generators, ships and other industries. [0004] There are many structural types of radial sliding bearings, including cylindrical sliding bearings, elliptical sliding bearings, fixed multi-oil wedge sliding bearings, segmented tilting sliding bearings, etc. [0005...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the shortcomings of the original cylindrical sliding bearing, such as small load-bearing area and high peak oil film pressure, and the difficulty of installing the segmented tiltable guide bearing, the present invention designs a bearing area that can greatly increase the load-bearing area of ​​the sliding bearing and reduce the peak pressure. , increase the thickness of the oil film, reduce the minimum critical safe speed and facilitate the installation of a new type of radial sliding bearing

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