TURBINE THRUST BEARING AND IT’S FUNCTION
The thrust bearing consists of Babbitt metal lined, stationary shoes that run against the rotor thrust runner. Shoes on both sides of the runner prevent movement in either axial direction. Journal bearing are used to take radial load of the shaft. But it can’t take axial load. Shaft is permitted to float to both axial directions. but the axial float is restricted to certain limit. Excessive axial shift may damage rotation and fixed parts. For this thrust bearing are provided.
Thrust bearing consists of series of sector- shaped shoes or pads fixed on pivots and arranged in a circle around the shaft collar. Each shoe is free to tilt about a pivot. Normally, the pivot takes the form of a hardened spherical surface inserted behind each shoe. The shoe is free to tip in both circumferential and radial directions. This allows accommodation of any misalignment that may exist between the shoes and the thrust runner. When the runner is stationary, the shoes are parallel to the runner Oil pressure causes the pad to tilts slightly, building a wedge of pressurized fluid between the shoe and the collar surface. This tilting pad tilts and remains in a particular position depending upon the bearing load and speed. Wedge -shaped regions of oil are created inside the bearing between the pads and rotating collar. Which supports the applied thrust and eliminate metal-on-metal contact .
Each pad is free to tilt so that it creates a self sustaining hydrodynamic oil film. Like journal film like journal bearing. The face of these pads is babbitted. Pads are arranged around the protected collar of the shaft. Lubrication oil supplied to created oil film between shaft collar and bearing pad. The pads are fitted with temperature sensors (RTD’s)
normally two sets of thrust bearing are provided in front bearing pedestal at both side of the shaft collar. The tilting-shoe type of thrust bearing is capable of carrying the greater load of the two thrust-bearing types.
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