| 摘要 |
<p>In order to reduce leakage from the seal part of a centrifugal compressor and to improve the damping characteristic at the seal part, this centrifugal compressor is equipped with: a casing; a rotor which is held in this casing in a rotatable manner and to which an impeller is attached; and a labyrinth seal which is attached to the casing and is arranged opposing the rotor. A gas is compressed as the impeller rotates. The labyrinth seal is provided on at least the intake part of the final-stage of the impeller or a balance piston that balances the thrust of the rotor. The diameter of the rotor opposing the labyrinth seal increases or decreases in a stepwise manner. Furthermore, the labyrinth seal is formed from multiple grooves in the axial direction, and multiple pockets are formed in the circumferential direction in each groove.</p> |
