ROTOR PLATFORM MODIFICATION AND METHODS USING BRUSH SEALS IN DIAPHRAGM PACKING AREA OF STEAM TURBINES TO ELIMINATE ROTOR BOWING

摘要

in a steam turbine , between the diaphragm web (web) and the wheels are adjacent in the axial direction on the rotor radially outwardly projecting the combined brush and labyrinth seal between the platform is provided. The brush seal is located upstream teeth of the labyrinth seal . The platform at least one projecting radially outwardly adjacent the opposite axial ends of the platform , and preferably includes a pair of flanges or fins . And the bristles of the brush seal , a non-uniform heat distribution , which is caused by frictional contact between the sealing surface on the platform along the rotor surface affecting rotor dynamics are eliminated or minimized .