| 摘要 |
PURPOSE:To keep a stationary-time gap in the minimum as preventing any contact between an inner casing and a moving blade at the time of starting from occurring by forming a casing into an inner-outer double structure, and deforming the inner casing according to a gap between the inner casing and the moving blade. CONSTITUTION:A casing housing a rotor 1 and a moving blade 2 is divided into each of inner and outer casings 4, 3, while these casings are coupled with each other by a support spring 7. On an outer circumference of the inner casing 4, there is provided with a heater 5 deforming this casing. In addition, a gap sensor 6 is set up in space between an inner circumference of the inner casing 4 and a tip of the moving blade 2, and a gap between these elements is always measured. A current for the heater 5 is controlled via a comparator 9 and a servoamplifier 10 so as to cause the detected value of the gap sensor 6 to become the desired value 8. With this constitution, proper gap control is performed to any starting pattern. |
