Importance

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Abstract

A centrifugal compressor is able to cause air to efficiently flow to an impeller thereof, and enables improvement of operating efficiency. The centrifugal compressor has: a casing having an inlet flow channel and a connection flow channel formed therein, the inlet flow channel having a suction port provided at one place thereof, the connection flow channel being connected to the inlet flow channel; a main shaft inserted in the casing; an impeller fixed to the main shaft and arranged in the inlet flow channel; and an inlet guide vane unit having a plurality of inlet guide vanes arranged upstream of the impeller of the inlet flow channel. In the inlet guide vane unit, an arrangement interval between inlet guide vanes at a suction port side is narrower than an arrangement interval of inlet guide vanes at a side opposite to the suction port side.

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First Claim