Fluid seal for compressor

Claim 1

A COMPRESSOR OF THE SCREW ROTOR TYPE FOR COMPRESSING ELASTIC FLUID COMPRISING A CASING STRUCTURE PROVIDING A BARREL PORTION HAVING INTERSECTING BORES WITH COPLANAR AXES AND CONFINED BY END WALL PORTIONS AND FURTHER PROVIDING MAINLY DIAGONALLY LOCATED LOW PRESSURE AND HIGH PRESSURE PORTS COMMUNICATING WITH SAID BORES, MALE AND FEMALE ROTORS PROVIDED WITH HELICAL LANDS AND INTERVENING GROOVES ROTATABLY MOUNTED IN SAID BORES, THE LANDS OF THE MALE ROTOR HAVING CONVEXLY CURVED FLANKS THE MAJOR PORTIONS OF WHICH LIE OUTSIDE THE PITCH CIRCLE OF THE MALE ROTOR AND THE GROOVES OF THE FEMALE ROTOR HAVING CONCAVELY CURVED FLANKS THE MAJOR PORTIONS OF WHICH LIE INSIDE THE PITCH CIRCLE OF THE FEMALE ROTOR, THE LANDS AND GROOVES OF SAID ROTORS INTERMESHING TO FORM WITH THE CASING STRUCTURE CHEVRON SHAPED WORKING CHAMBERS EACH COMPOSED OF COMMUNICATING PORTIONS OF A MALE ROTOR GROOVE AND A FEMALE GROOVE JOINING AT THE APEX END OF THE CHAMBER AND SAID APEX END MOVING AXIALLY TOWARD SAID HIGH PRESSURE PORT AS THE ROTORS REVOLVE TO DECREASE THE VOLUME OF THE CHAMBER AND EFFECT COMPRESSION OF THE FLUID CONTENTS THEREOF, AND MEANS FOR INJECTING LIQUID UNDER PRESSURE INTO THE WORKING SPACE PROVIDED BY SAID BORES, SAID MEANS COMPRISING PASSAGES EXTENDING THROUGH SAID CASING STRUCTURE ON THE HIGH PRESSURE SIDE OF THE PLANE OF SAID AXES AND TERMINATING AT THEIR INNER ENDS IN OPENINGS FOR DISCHARGING LIQUID INTO SAID WORKING SPACE, SAID PASSAGES AND OPENINGS BEING CONSTRUCTED AND ARRANGED SO THAT THE LIQUID IS DISCHARGED FROM SAID OPENINGS OBLIQUELY WITH RESPECT TO A TRANSVERSE PLANE NORMAL TO THE AXES OF SAID ROTORS IN A DIRECTION GIVING THE LIQUID DISCHARGE FROM SAID OPENINGS A VELOCITY COMPONENT DIRECTED TOWARDS SAID HIGH PRESSURE PORT.