| CPC F04D 29/444 (2013.01) [F04D 17/122 (2013.01)] | 7 Claims |
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1. A centrifugal compressor comprising:
a rotary shaft;
a plurality of centrifugal impellers mounted on the rotary shaft;
a diffuser in which a fluid flowing from the centrifugal impeller flows in a centrifugal direction away from the rotary shaft;
a return flow path provided on a downstream of the diffuser, wherein the fluid flowing from the diffuser to a subsequent centrifugal impeller flows in the return flow path in a return direction toward the rotary shaft;
a plurality of return vanes arranged in a circular vane row shape around a center line of the rotary shaft as a center, the return vanes being installed in the return flow path such that a turning part outlet is located at a direct upstream of a leading edge; and
a turning part at which a flow of the fluid flowing out of the diffuser turns from the centrifugal direction to an axial direction and turns from the axial direction to the return direction,
wherein the return vanes where a plurality of circular vane rows are provided are disposed in two lines from an upstream side to a downstream side of a flow of the fluid in the return flow path; and
wherein an inlet blade angle (β) of an outlet guide vane provided on the downstream side in the return vanes and an inlet blade angle (α) of an inlet guide vane provided on the upstream side in the return vanes have a relationship β<α,
wherein a maximum camber position of a camber line of the inlet guide vane is located in a latter half of a chord line, wherein the maximum camber position is a position in the chord line at which a distance is maximum, the distance being a distance of a perpendicular line extending in a vertical direction from a given position in the chord line connecting a leading edge and a trailing edge of the inlet guide vane to reach the camber line.
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