ROTATING MACHINE

摘要

Provided is a rotating machine that is provided with: a rotating shaft (2); a plurality of impellers (3) that are affixed to the rotating shaft (2) and that rotate with the rotating shaft (2); and a casing (5) that surrounds the rotating shaft (2) and the impellers (3), and that forms diffuser channels (19) through which is circulated a fluid (G) that is discharged from the impellers (3) in the radial direction toward the outside and return channels (20) that guide the fluid (G) circulated in the diffuser channels (19) in the radial direction toward the inside and lead the fluid (G) to downstream impellers (3). As regards the plurality of impellers (3), the further downstream the arrangement thereof, the smaller the cross-sectional areas of the fluid (G) flow paths are formed to be, and among the diffuser channels (19) that correspond to each pair of neighboring impellers (3), the diffuser channel (19) arranged on the upstream side is a vaneless diffuser, and the diffuser channel (19) arranged on the downstream side is a vaned diffuser.

主权项

1. A rotating machine comprising:
a rotating shaft; multiple impellers fixed to the rotating shaft, and rotating together with the rotating shaft; and a casing configured to surround the rotating shaft and the impellers, and to form diffuser channels allowing the flowing through of a fluid which is discharged from the impellers to an outward side in a radial direction, and return channels by which the fluid flowing through the diffuser channels is guided to an inward side in the radial direction, and is introduced into the impellers of downstream stages, wherein the multiple impellers are formed such that the sectional area of a flow path of the impeller for the fluid is smaller when the impeller is disposed at a further downstream stage, and wherein the diffuser channel of an upstream stage of the diffuser channels respectively corresponding to a pair of adjacent impellers is a vaneless diffuser, and the diffuser channel of a downstream stage is a vaned diffuser.