| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a seal structure capable of improving sealability, and capable of improving reliability, by actively controlling operation of a movable seal ring. <P>SOLUTION: This seal structure 41 is provide for partitioning a high-pressure part and a low-pressure part, and has a spring-back seal ring 51 on its high-pressure side, and has an ACC seal ring 49 and a fin 71 on its low-pressure side. A part of the ACC seal ring 49 is a movable seal ring 73 movable in the substantially radial direction, and has the movable seal ring 73 capable of partitioning and adjusting a part between a high-pressure side steam chamber 43 and an intermediate-pressure side steam chamber 45 by the fin 71 and a peripheral surface 83, and has an equalizing pipe 47 to be connected to a high pressure outlet part 25 on the low pressure-side of the adjustable movable seal ring 73, and has an adjustment pipe 55 for connecting a high-pressure dummy 39 to the high pressure outlet part 25 in the same as the intermediate-pressure side steam chamber 45, and an open/close valve 57 arranged in the adjustment pipe 55, in a position on the high-pressure side steam chamber 43 side of the ACC seal ring 49. <P>COPYRIGHT: (C)2010,JPO&INPIT |
