GAS TURBINE FIRST-STAGE STATOR BLADE SEALING STRUCTURE

摘要

A sealing structure for a first stage stator blade of a gas turbine (1), capable of preventing the leakage of sealing air from the interior of the blade even when the stator blade inclines due to thermal stress occurring therein, comprising an arcuately formed rear flange (12) of a first stage stator blade (31), a linear rib (10) provided on the rear flange, and a stat or blade support ring (13) in contact with the rib to form a sealing surface. When the rear flange (12) and the stator blade support ring (13) are incline d relatively to each other as shown by 13a, 13b, an upper or lower end of the horizontal rib (10) and a surface of the circular stator blade support ring (13) are brought into linear contact with each other, so that there arises n o clearance that prevents the leakage of the sealing air. When a stator blade support ring (13) of a conventional gas turbine is inclined, an arcuate clearance occurs between the support ring and a rear flange (12) since no horizontal rib (10) is provided, so that the sealing air leaks from the interior of the gas turbine into a gas passage. The present invention can prevent this inconvenience.