| 摘要 |
PROBLEM TO BE SOLVED: To reduce a quantity of seal gas for shaft sealing while keeping thrust balance in a multiple stage centrifugal compressor. SOLUTION: In the multiple stage centrifugal compressor 80, many centrifugal impellers 1 to 7 are mounted to a rotary shaft 11 and the centrifugal impellers are stored in a casing. Cylindrical balance drums 21, 22 are provided at the suction side of the first stage impeller 1 mounted to the rotary shaft and at the delivery side of the final stage impeller 7 mounted to the rotary shaft, respectively, and balance spaces 31, 32 are formed at the shaft end side of each balance drum. Means 91, 92 communicating with delivery sides of the impellers 3, 5 of intermediate stages excluding a first stage and a final stage in the impellers formed in multiple stages are connected to the balance spaces. COPYRIGHT: (C)2008,JPO&INPIT
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