Patent ID: 11859621
Assignee: TRANE INTERNATIONAL INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 12:
13. A method of operating a centrifugal compressor, the centrifugal compressor including a first stage impeller, a second stage impeller, and a plurality of guide vanes and a side stream injection port each respectively located between the first stage impeller and the second stage impeller, and the method comprising:
compressing a fluid with the first stage impeller;
directing, via channels formed by the plurality of guide vanes, an interstage flow of the fluid discharged from the first stage impeller to an inlet of the second stage impeller; and
actuating a throttle ring to adjust a flow of the fluid in the interstage flow into the second stage impeller, the centrifugal compressor including the throttle ring and a drive ring, the throttle ring including slots, the drive ring including radial shafts, the radial shafts of the drive ring extending through the slots in the throttle ring to form drive linkages that connect the drive ring to the throttle ring, and the actuating of the throttle ring including:
moving the throttle ring in an axial direction between a retracted position and an extended position by a rotation of the drive ring, the rotation of the drive ring causing the throttle ring to move in the axial direction, wherein

in the extended position, flow of the side stream of the fluid through the side stream injection port is obstructed by the throttle ring and the interstage flow of the fluid through the channels is obstructed by the throttle ring, and
in the retracted position, the side stream of the fluid flows through the side stream injection port and into the inlet of the second stage impeller.