CPC F04D 27/0207 (2013.01) [F01D 17/162 (2013.01); F04D 17/14 (2013.01); F04D 27/001 (2013.01); F04D 27/009 (2013.01); F04D 27/0238 (2013.01); F04D 27/0246 (2013.01); F04D 29/284 (2013.01); F04D 29/4213 (2013.01); F04D 29/685 (2013.01); F25B 31/026 (2013.01)] | 10 Claims |
1. A centrifugal compressor, comprising:
a housing defining an inlet chamber and including at least one first opening and at least one second opening, the at least one first opening and at least one second opening defining a recirculation passage in fluid communication with the inlet chamber;
an impeller within the housing and rotatable about a longitudinal axis to draw fluid into the inlet chamber;
a first ring including at least one ring opening;
a plurality of radial inlet guide vanes that are situated in the inlet chamber and are rotatable about respective axes from an open position to a closed position, wherein the plurality of radial inlet guide vanes restrict a flow of the fluid from the inlet chamber to the outlet passage more in the closed position than in the open position;
a second ring; and
a controller configured to:
rotate the first ring about the longitudinal axis between a first position and a second position to control a flow of fluid through the recirculation passage, wherein the first ring obstructs at least one of the first and second openings more in the second position than in the first position; and
rotate the plurality of radial inlet guide vanes about their respective axes based on rotation of the second ring about the longitudinal axis.
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