Patent ID: 11898561
Assignee: CARRIER CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A direct-drive refrigerant screw compressor, comprising:
a housing;
a compression chamber in the housing;
a motor in the housing;
a pair of rotors disposed in the compression chamber, the pair of rotors including a first rotor and a second rotor, the second rotor having respective first and second axial shaft portions, the first axial shaft portion being driven by the motor, each rotor of the pair of rotors being rotationally disposed in the compression chamber and including an outer surface with a screw-geared profile to define alternating peaks and troughs axially along the outer surface;
a working fluid being disposed in the compression chamber for providing lubrication to each rotor, wherein the working fluid is refrigerant;
a first port extending through the housing and configured for directing the working fluid toward the compression chamber;
wherein:
for each rotor, the compressor includes a plurality of bearing packs disposed within a respective plurality of bearing chambers;
the first port is fluidly connected to a passage only in the second shaft portion and in the second rotor of the pair of rotors that directs the working fluid to the compression chamber;
the passage extends between an axial aft port of the second rotor passing through the second axial shaft portion and into the second rotor to end at the outer surface of the second rotor;
the axial aft port extends through one of the plurality of bearing chambers; and
the passage includes an axial segment forming a blind hole and a plurality of radial segments that are axially spaced apart from each other and fluidly connected between the axial segment and a respective plurality of surface ports that are axially spaced apart from each other on the outer surface of the second rotor, and the passage includes a flow control orifice located aft of the plurality of radial segments,
wherein the plurality of surface ports are axially spaced apart at regular intervals along the outer surface of only the second rotor of the pair of rotors, wherein at least one first surface port of the plurality of surface ports is positioned at or proximate a peak of the alternating peaks and troughs and at least one second surface port of the plurality of surface ports is disposed at or proximate a trough of the alternating peaks and troughs;
wherein the plurality of surface ports are configured to distribute the working fluid provided through the passage along the outer surface of the second rotor, so that when the motor operates to rotate the second rotor, the second rotor rotates the first rotor and disperses the distributed working fluid on the outer surface of the second rotor to provide the lubrication to the first rotor and the second rotor.