Rotary compressor injection cooling arrangement

Claim 1

A HERMETICALLY SEALED REFRIGERANT COMPRESSOR ADAPTED FOR USE IN A REFRIGERATION SYSTEM COMPRISING A HERMETIC CASING ADAPTED TO CONTAIN A HIGH PRESSURE REFRIGERANT GAS, A COMPRESSOR UNIT IN SAID CASING INCLUDING A CYLINDER HAVING AN ANNULAR COMPRESSION CHAMBER AND END WALLS ENCLOSING THE ENDS OF SAID ANNULAR CHAMBER, A ROTOR ECCENTRICALLY ROTATABLE WITIN SAID CHAMBER, MEANS WITHIN SAID CHAMBER BETWEEN THE OUTER PERIPHERY OF SAID ROTOR AND THE SURFACE OF SAID ANNULAR CHAMBER FOR DIVIDING SAID CHAMBER INTO HIGH AND LOW PRESSURE SIDES, MEANS INCLUDING A SUCTION INLET OPENING COMMUNICATING WITH SAID ANNULAR CHAMBER AT SAID LOW PRESSURE SIDE OF SAID DIVIDING MEANS FOR INTRODUCING LOW PRESSURE REFRIGERANT GAS INTO SAID ANNULAR CHAMBER, MEANS INCLUDING A GAS DISCHARGE OPENING COMMUNICATING WITH SAID ANNULAR CHAMBER ON SAID HIGH PRESSURE SIDE OF SAID DIVIDING MEANS FOR CONDUCTING HOT COMPRESSED REFRIGERANT GAS FROM SAID CHAMBER INTO SAID HERMETIC CASING, A DRIVE MOTOR MOUNTED WITHIN SAID HERMETIC CASING, SAID MOTOR HAVING A SHAFT EXTENDING FROM SAID MOTOR THROUGH ONE OF SAID END WALLS OF SAID CYLINDER FOR ECCENTRICALLY DRIVING SAID ROTOR AROUND SAID CHAMBER SO THAT THE PERIPHERAL SURFACE OF SAID ROTOR MOVES PROGRESSIVELY INTO SEALING RELATION WITH SUCCESSIVE PORTIONS OF SAID ANNULAR CHAMBER FROM SAID SUCTION INLET OPENING TOWARD SAID GAS DISCHARGE OPENING THEREBY TO DRIVE REFRIGERANT GAS AROUND SAID CHAMBER TO COMPRESS SAID GAS THEREIN TOWARD SAID DIVIDING MEANS, MEANS FOR INJECTING CONDENSED LIQUID REFRIGERANT INTO SAID ANNULAR CHAMBER INCLUDING A LIQUID REFRIGERANT INJECTION PORT IN ONE END WALL OF SAID CYLINDER COMMUNICATING WITH SAID CHAMBER ON THE HIGH PRESSURE SIDE OF SAID DIVIDING MEANS, SAID LIQUID REFRIGERANT INJECTION PORT BEING SO CONSTRUCTED AND ARRANGED THAT ITS DISCHARGE IS COVERED AND UNCOVERED BY THE ENDS OF SAID ROTOR DURING THE ECCENTRIC ROTATION THEREOF AROUND SAID CHAMBER, SAID INJECTION PORT HAVING ITS DISCHARGE AXIS SLANTED CIRCUMFERENTIALLY IN A DIRECTION TO DISCHARGE SAID LIQUID REFRIGERANT CIRCUMFERENTIALLY IN A DIRECTION AWAY FROM SAID DIVIDING MEANS TOWARD THE ADVANCING SURFACE OF SAID ROTOR AS IT COMPRESSES SAID GAS THEREBY TO DIRECT SAID LIQUID REFRIGERANT TOWARD SAID SEMICOMPRESSED GAS AS IT IS FORCED BY SAID ROTOR AROUND SAID CHAMBER TOWARD SAID DIVIDING MEANS WHENEVER SAID ROTOR UNCOVERS SAID INJECTION PORT SO THAT SAID LIQUID REFRIGERANT IS THOROUGHLY MIXED WITH SAID GAS PRIOR TO BEING DISCHARGED FROM SAID CHAMBER.