| 摘要 |
PURPOSE:To prevent increase of turbine vibration due to resonance of the turbine blade in the final stage when a large-sized steam turbine is operated at low load and small flow. CONSTITUTION:This vibrationproofing device of a steam turbine blade is constituted of a pressure sensor 6 to detect pressure variation on the tip part of a turbine blade 1, processing devices (7,8,9) to obtain the vibration component comformed to the blade frequency from the detected vibration variation, a seal ring 5 which is circumferentially provided inside a turbine casing 2, opposite to the tip part of the turbine blade and movable in the radial direction, and an actuator 10 to move the seal ring 5 in the radial direction according to magnitude of the vibration component. |
