| 摘要 |
PURPOSE:To cool a rotor so effectively even at the time of partial load, by installing each through hole which leads cooling steam into an intermediate gland packing part and a nozzle diaphragm inner ring part, and, in turn, installing an on-off element in these holes. CONSTITUTION:A through hole 19a is formed in an intermediate gland packing part 7 and another through hole 19b in a nozzle diaphragm inner ring part 4, respectively, then cooling steam is led into them. An on-off element consisting of a block 20 and a spring 21 is set up in each of these through holes 19a and 19b. At the time of partial load, this block 20 moves to the upstream side by dint of differential pressure, whereby the cooling steam flows in from a clearance. With this constitution, a rotor can be effectively cooled.
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