Sealing structure in steam turbine

摘要

According to an embodiment, a rotor blade cover section (5) is integrated with the rotor blades (1) at leading ends thereof. A plurality of sealing fins (6) is disposed at the rotor blade cover section (5), the sealing fins (6) forming a predetermined clearance relative to an inner peripheral portion of the nozzle outer ring (3). An annular solid particle trapping space (8) is disposed at the inner peripheral portion of the nozzle outer ring (3), the solid particle trapping space (8) communicating with an inlet (15) of a steam leak (16) and trapping solid particles (20) that flow in with steam. In the sealing structure, the nozzle outer ring (3) has a through hole (12) through which the solid particles (20) are to be discharged from the solid particle trapping space (8) toward a downstream stage of the steam turbine.