BigPatents India

The invention relates to a high temperature shaft seal for gas divertor in a combined cycle power plant comprising a seal housing (1) having a cover plate (2) and a seal element (3) sealing a drive shaft (5) wherein the said element (3) is having a plurality of segments (4) movable readially inward for adjustment of the gap caused by wear between the drive shaft (5) and the seal (3) and between any two adjacent segments (4) can be closed, in inner diameter being bent at an angle (A) upto 450 towards gas pressure (6) side from the air/ bearing side (7) and the inner diameter of the said seal (3) is kept at smaller than the diameter of the drive shaft (5) so that the edge of the seal element (3) site against the drive shaft (5) surface with finite pressure at the contact line to ensure zero gap at all operating temperature and pressure.