| 摘要 |
<p>PURPOSE:To always smoothly turn a drive ring of a nozzle blade by providing a support of the drive ring pressed by a spring between the periphery of a casing and the internal periphery of the drive ring of the nozzle blade and inserted possible to advance/reverse in a wedge shape. CONSTITUTION:A plurality of nozzle blades 5 are annularly turnably arranged in a gas flow path 4 of a gas inlet casing 8. The nozzle blade 5 is turned through a drive shaft 7, drive lever 6 and a pin 13 by turning a drive ring 21, to adjust a flow amount of gas flowing in a turbine moving blade 1. A support 22, coming into slide contact with the drive ring 21 to turnably support it, is inserted in a wedge shape between the internal periphery of the drive ring 21 and the external periphery of a gas outlet casing 9 of fitting this drive ring 21. In this way, even when the gas outlet casing 9 is expanded by heat, no excessive pressure acts on a slide contact surface of the support 22 with the drive ring 21, and the drive ring 21 can be always smoothly turned.</p> |
