Two-stage centrifugal compressor with extended range and capacity control features

摘要

One exemplary embodiment of this disclosure relates to a centrifugal refrigerant compressor system. The system includes a condenser, an evaporator, and an economizer between the condenser and the evaporator. The system further includes a centrifugal compressor having a first impeller and a second impeller downstream of the first impeller. The compressor includes at least one port. Fluid from a recirculation flow path and an economizer flow path is introduced into a main flow path of the compressor by way of the at least one port.

主权项

1. A centrifugal refrigerant compressor system, comprising:
a condenser; an evaporator; an economizer between the condenser and the evaporator; and a centrifugal compressor including a first impeller and a second impeller downstream of the first impeller, the compressor including at least one port provided at a location downstream of the first impeller, wherein fluid from a recirculation flow path and an economizer flow path is introduced into a main flow path of the compressor by way of the at least one port, wherein the recirculation flow path is provided directly between an outlet of the compressor and the at least one port, wherein the at least one port is a single port provided downstream of the first impeller and upstream of the second impeller, and wherein the port is provided adjacent a return channel between the first and second impellers.