Centrifugal compressor

A closed cycle drive unit comprising:

• a drive turbine, a centrifugal compressor comprising an impeller located within a casing inlet having a gas intake and an outlet, the impeller having an input drive, and an impulse turbine rotor positioned around the periphery of the impeller adjacent the outlet, the impulse turbine rotor having an output shaft coupled to the input drive of the impeller, the impulse turbine rotor being driven by high velocity gas exiting the impeller whereby the impeller has a plurality of radial impeller blades at a gas exit of the impeller thereby maintaining the high velocity gas exiting the impeller blades wherein the pressure of the gas entering the impulse turbine rotor is maintained at an exit of the impulse turbine rotor, and a stator positioned between the exit of the impeller and the impulse turbine rotor redirects exiting gases to the impulse turbine rotor, the drive turbine having a gas inlet and a gas outlet and a drive turbine output shaft wherein the exhaust gas of the impulse turbine rotor passes through a heat exchanger to be fed to the gas inlet of the drive turbine, the gas outlet of the drive turbine being coupled to the gas intake of the centrifugal compressor and the drive turbine output shaft coupled to the input drive of the impeller of the centrifugal compressor.

A centrifugal compressor comprising a casing including an impeller having a gas intake and an outlet, the impeller having an input drive, and an impulse turbine rotor positioned around the periphery of the impeller adjacent the outlet, the impulse turbine rotor driving an output shaft, the impulse turbine rotor to be driven by high velocity gas exiting the impeller whereby the impeller has a plurality of radial impeller blades at a gas exit of the impeller configured to maintain the high velocity of the gas exiting the impeller blades, wherein the pressure of the gas entering the impulse turbine rotor is maintained at an exit of the impulse turbine rotor and a stator is positioned between the exit of the impeller and the impulse turbine rotor that redirects exiting gases to the impulse turbine rotor.

A closed cycle drive unit comprising:

• a drive turbine, a centrifugal compressor comprising an impeller located within a casing inlet having a gas intake and an outlet, the impeller having an input drive and an impulse turbine rotor positioned around the periphery of the impeller adjacent the outlet, the impulse turbine rotor having an output shaft coupled to the input drive of the impeller, the impulse turbine rotor being driven by high velocity gas exiting the impeller whereby the impeller has a plurality of radial impeller blades at a gas exit of the impeller thereby maintaining the high velocity gas exiting the impeller blades wherein the pressure of the gas entering the impulse turbine rotor is maintained at an exit of the impulse turbine rotor, and a stator positioned between the exit of the impeller and the impulse turbine rotor redirects exiting gases to the impulse turbine rotor, the drive turbine having a gas inlet and a gas outlet and a drive turbine output shaft wherein the exhaust gas of the impulse turbine rotor passes through a heat exchanger to be fed to the gas inlet of the drive turbine, the gas outlet of the drive turbine being coupled to the gas intake of the centrifugal compressor and the drive turbine output shaft coupled to the input drive of the impeller of the centrifugal compressor.