| 摘要 |
PURPOSE:To aim at a substantial reduction in the quantity of leakage gas by inserting a circular-ring shaped sealing ring provided with bellows between a moving blade and a casing at every stage in a gas turbine, and then connecting said ring through a control rod to an actuator in such a manner that it is made movable in the radial direction. CONSTITUTION:A blade ring 11, consisting of a plurality of segments divided in the circumferential directions, is attached to the internal surface of a casing 1, and then, on the peripheral side of said blade ring 11 is provided a stationary blade 2. In addition, on the inside of the blade ring 11 is fixed a circular-ring shaped sealing ring 6, which is provided with projections of labyrinth seal, together with a bellows being movable in the radial direction, and then, the terminal of the bellows is supported by a part of a projection 10 provided on the internal wall of said sealing ring 6. And further, from the casing side wall-surface of the sealing ring 6 is extended a control rod 7, which is supported so that it may be free to move in the radial direction, in the radial direction after penetrating the casing 1, and then, the tip 8 thereof is connected to an actuator 9 which is made movable freely in the radial direction. Said actuator 9 is controlled according to the pressures of fluid, of which the intake and exhaust are controlled by means of a pressure conduit tube 12. |
