US 11,808,277 B2
Centrifugal compressor with recirculation passage
Vishnu M. Sishtla, Manlius, NY (US); and William T. Cousins, Glastonbury, CT (US)
Assigned to Carrier Corporation, Palm Beach Gardens, FL (US)
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
Filed on Oct. 5, 2022, as Appl. No. 17/960,401.
Application 17/960,401 is a division of application No. 17/482,526, filed on Sep. 23, 2021, granted, now 11,499,561.
Application 17/482,526 is a division of application No. 16/272,032, filed on Feb. 11, 2019, granted, now 11,156,226, issued on Oct. 26, 2021.
Claims priority of provisional application 62/628,364, filed on Feb. 9, 2018.
Prior Publication US 2023/0025097 A1, Jan. 26, 2023
Int. Cl. F04D 27/02 (2006.01); F04D 29/42 (2006.01); F04D 29/68 (2006.01); F01D 17/16 (2006.01); F04D 17/14 (2006.01); F04D 27/00 (2006.01); F04D 29/28 (2006.01); F25B 31/02 (2006.01)
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
OG exemplary drawing
 
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.