US 11,655,822 B1
Multi-stage pump or turbine for controlling fluids with significant variations in gas fraction
Andreas Dreiss, Geestland (DE); Bonnie M. Brezinsky, Bethlehem, PA (US); Gregory Morrison, Nazareth, PA (US); Neil Havrilla, Coplay, PA (US); and Scott C. Judge, Bethlehem, PA (US)
Assigned to Flowserve Pte. Ltd., Singapore (SG)
Filed by Flowserve Management Company, Irving, TX (US)
Filed on Aug. 3, 2022, as Appl. No. 17/880,076.
Int. Cl. F04D 13/12 (2006.01); F01D 13/00 (2006.01); F04D 7/00 (2006.01)
CPC F04D 13/12 (2013.01) [F01D 13/00 (2013.01); F04D 7/00 (2013.01); F05D 2220/30 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A multi-stage hydraulic rotating machine (MSHRM) comprising:
a first stage having a first design, and a second stage having a second design that is different from the first design, said first and second designs comprising respective first and second rotatable impellors, the MSHRM being configured to control a process fluid as the process fluid flows serially through the first stage and through the second stage;
a rotating speed of the first impellor and a rotating speed of the second impellor being independently controllable over a first speed range and a second speed range, respectively;
said first design having a first best efficiency point (BEP) at which the first stage operates at maximal efficiency, said first BEP including a first BEP volumetric flow rate (VFR) that is adjustable over a first VFR range from a first minimum VFR to a first maximum VFR by varying the rotating speed of the first impellor over the first speed range from a first minimum speed to a first maximum speed;
said second design having a second BEP at which the second stage operates at maximal efficiency, said second BEP including a second BEP VFR that is adjustable over a second VFR range from a second minimum VFR to a second maximum VFR by varying the rotating speed of the second impellor over the second speed range from a second minimum speed to a second maximum speed; and
the first minimum VFR is not equal to the second minimum VFR, and/or the first maximum VFR is not equal to the second maximum VFR.