Refrigerant vapor compressor

Claim 1

A COMPRESSOR COMPRISING: A CASING CYLINDER HAVING A BORE FORMED THEREIN, FRONT AND REAR BEARING PLATES ON OPPOSITE SIDES OF SAID CASING CYLINDER, A ROTOR SHAFT JOURNALED IN SAID BEARING PLATES AND EXTENDING THROUGH SAID BORE ON AN AXIS ECCENTRICALLY OFFSET RELATIVE TO THE BORE AXIS, A ROTOR ON SAID SHAFT HAVING A TANGENT SEAL CONTACT WITH THE BORE WALL AND FORMING THEREWITH A CRESCENTSHAPED WORKING CHAMBER, SPLINED COUPLING MEANS BETWEEN SAID SHAFT AND SAID ROTOR AFFORDING SELF-CENTERING MOVEMENT OF SAID ROTOR BETWEEN SAID BEARING PLATES, SAID ROTOR HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED PERIPHERAL VANE SLOTS FORMED THEREIN, A VANE IN EACH SAID SLOT, PINS EXTENDING THROUGH SAID SHAFT BETWEEN OPPOSITELY DISPOSED VANES AND HAVING COIL SPRINGS AROUND SAID PINS AND ENGAGING SAID VANES TO PRESSURE-BIAS SAID VANES OUTWARDLY AGAINST THE ADJOINING BORE WALL, SAID FRONT BEARING PLATE HAVING AN INLET VALVE AND A DISCHARGE VALVE AND BEING FORMED WITH AN INLET KIDNEYSHAPED RECESS ADJACENT ONE SIDE OF SAID WORKING CHAMBER, AT LEAST ONE OF SAID BEARING PLATES HAVING FORMED THEREIN A SCAVENGING GROOVE FORMED AXIALLY OPPOSITE SAID ROTOR AND EXTENDING CIRCUMFERENTIALLY ON THE INLET SIDE OF THE COMPRESSOR AND SPACED RADIALLY INWARDLY OF SAID INLET RECESS, SAID SCAVENING GREOOVE HAVING A DISCHARGE END EXTENDING RADIALLY OUTWARDLY INTO THE WORKING CHAMBER TO MINIMIZE GAS AND LUBRICANT LEAKAGE INTO THE SUCTION SIDE OF THE COMPRESSOR, OUTLET MEANS FOR CONDUCTING PRESSURIZED FLUID FROM THE WORKING CHAMBER TO A POINT OF UTILIZATION, SAID OUTLET MEANS COMPRISING A BOSS FORMED ON SAID CASING CYLINDER ADJACENT SAID TANGENT SEAL CONTACT AND FORMING A FLAT VALVE SEATING SURFACE, AND SAID CASING CYLINDER HAVING A DOUBLE ROW OF PARALLEL CIRCUMFERENTIALLY SPACED OPENINGS FORMING PORTS EXTENDING OUTWARDLY FROM THE OUTLET SIDE OF SAID WORKING CHAMBER THROUGH SAID VALVE SEATING SURFACE,