Steam turbine thrust bearing and radial bearings how to define?

Steam turbine thrust bearing and radial bearings how to define? 2019 - 05 - 05 mainly undertakes the thrust bearing of turbine rotor axial thrust, determine the axial position of the rotor in the cylinder. Radial bearing the rotor rotating generated when the oil film, the quality of the main rotor and centrifugal force caused by the unbalance of the rotor quality, and determine the radial position of the rotor. Thrust bearing is used to bear axial force of the bearing, axis is parallel to the direction of the force bearing, also known as the thrust bearing. Separated type thrust ball bearing is a bearing, shaft ring, can seat and cage, ball component separation. Shaft is made to match the shaft ring, a circle is to match the bearing hole of the ring, and there are gaps between shaft; Thrust ball bearings can only carry axial load, one-way thrust ball bearing is can only carry axial load in one direction, two-way thrust ball bearings can withstand axial load in two directions; Thrust ball bearing can't limit shaft radial displacement, limit rotational speed is low, one-way thrust ball bearing can limit the one direction of the axis and shell of axial displacement, two-way bearing can limit the axial displacement of two direction. Thrust roller bearing is used to carry axial load of axial, radial joint load, the radial load shall not exceed 55% of the axial load. Compared with other thrust roller bearings, the bearing friction factor is low, high speed, and has a self-aligning performance. Type 29000 type roller for asymmetric spherical roller bearings, roller and raceway can reduce the relative sliding in the work, and roller is long, large diameter, roller number, high load capacity, usually adopt oil lubrication, the individual is lubricated by grease at low speed. While selecting a design, should first selection; 80000 type thrust cylindrical roller bearings, the type 90000 type thrust tapered roller bearing and AXK thrust needle roller bearing, can bear the axial load of one-way, it is bigger than thrust ball bearing axial load capacity is much, and large rigidity, axial space is little. Thrust cylindrical roller bearings, thrust needle roller bearing is suitable for low speed, speed slightly higher than the thrust tapered roller bearing thrust cylindrical roller bearings. Radial bearing is mainly bear radial force of the bearing. The bearing parts of the shaft are called journal, and shaft neck matching parts called bush, make the whole cylindrical shell called a collar. Some general shell casting bearing shell, its top called bearing cover, the bottom half is called the bearing seat. Cover and seat with screw connection, both the faying surface by check or pin positioning, and different thickness of cushion can be placed to adjust bearing clearance. Most of the bearing joint face is horizontal, and there are also tilted, close to the vertical direction to adapt to the load on the joint surface requirements. For convenience of lubricating oil into the friction between the surface, open with filling holes on the bearing cover, bearing on the distribution of axial groove of lubricating oil. Bearing cover and seat are made of cast iron, the load bearing is made of cast iron or steel plate welded structure.