Patent ID: 9382911
Filing Date: 2016-07-05
CPC Classification: F04D,F25B

Claim Text:
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.