Control of steam turbine shaft thrust loads

Details Control of steam turbine shaft thrust loads Control of steam turbine shaft thrust loads

F - Mech Eng,Light,Heat,Weapons

01

D

277/17

F01D 3/04 (2006.01) F01D 25/16 (2006.01)

Patent

CA 1327376

ABSTRACT OF THE DISCLOSURE An overhung steam turbine is described which features a seal assembly and a bearing assembly to minimize axial shaft movement. The seal assembly forms a pressure barrier between a relatively low vacuum exhaust region and an exhaust cavity disposed at one end of the rotor shaft to minimize the pressure differential across the ends of the shaft and the resultant thrust force of the rotor shaft against the turbine casing. A bearing assembly-is provided which includes a pair of journal bearings and a pair of oppositely disposed thrust bearings. In one embodiment one thrust bearing is con- nected by an adapter ring which is mounted to a horizon- tally split bearing casing. In another embodiment, the thrust bearing is carried by one of the journal bearings. The journal bearings are preferrably connected by horizontally split ring bearings to facilitate insertion and removal of the bearings without removing the overhung shaft.

452033

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