Patent ID: 8864443
Filing Date: 2014-10-21
Classification: F01D,F05D,F16J

Abstract:
1. A sealing device for a steam turbine which includes a rotating region formed by a rotor and a member constructed to rotate integrally with the rotor, and a fixed region formed by a casing containing the rotating region, and by a member fixed to the casing, the sealing device being built into the steam turbine, the sealing device comprising: sealing fins provided in both or either of the rotating region and the fixed region; and spacers provided on the rotating region or fixed region, both facing the sealing fins, the spacers each using a free-cutting metal; wherein when a loading pressure that the steam applies to move the movable region in the axial direction of the rotor is smaller than an urging force that the urging means uses to urge the movable region in the opposite direction, the sealing fin and spacer that face each other are ready to come into contact with each other; and upon the loading pressure exceeding the urging force, the movable region moves to a position at which a clearance between the sealing fin and spacer that face each other reaches a preset value.