| 摘要 |
PROBLEM TO BE SOLVED: To secure the sealing performance of a sealing member even if a fixed side valve plate of a rotary valve of a rotating fluid machine is put in oscillating motion. SOLUTION: A pressure chamber 84 into which high-temperature and high-pressure stream is introduced, is opened to a mating surface 83 of the valve body part 72 of the rotary valve 71 with a fixed side valve plate 73. A leakage of steam to the mating surface 83 is prevented by the V-packing 88 enclosed in the pressure chamber 84, and the fixed side valve plate 73 and a movable side valve plate 74 are brought into close contact at a sliding surface 77 by the pressure applied to the pressure chamber 84. A seal lip S1 of the V-packing 88 and a seat surface 73a of the fixed side valve plate 73 on which the seal lip S1 abuts are formed in spherical surface shape. Consequently, even if the fixed side valve plate 73 supported to float is put in oscillating motion following the movable side valve plate 74 rotated together with a rotor, the seal lip S1 is positively brought into close contact with the seat surface 73a to secure the sealing performance of an abutting part. COPYRIGHT: (C)2005,JPO&NCIPI
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