Rotary piston, positive displacement compressors

Claim 1

A ROTARY PISTON, POSITIVE DISPLACEMENT COMPRESSOR HAVING A HOUSING STRUCTURE INCLUDIDNG A BARREL PORTION COMPRISED OF INTERSECTNG BORES WITH CO-PLANAR AXES PROVIDING A WORKING SPACE EXTENDING LONGITUDINALLY OF SAID BARREL PORTION, SUCH STRUCTURE HAVING A LOW PRESSURE PORT COMMUNICATING WITH ONE END OF SAID SPACE TO PROVIDE AN INLET A MAJOR PORTION OF WHICH IS LOCATED AT ONE SIDE OF THE PLANE OF SAID AXES CONSTITUTING THE LOW-PRESSURE SIDE OF THE COMPRESSOR AND A HIGH PRESSURE PORT SPACED FROM SAID LOW PRESSURE PORT TO PROVIDE A DISCHARGE FROM SAID SPACE THE MAJOR PORTION OF WHICH IS LOCATED AT THE OPPOSITE SIDE OF SAID PLANE CONSTITUTING THE HIGH-PRESSURE SIDE OF THE COMPRESSOR, ROTORS PROVIDED WITH HELICAL LANDS AND GROOVES HAVING AN EFFECTIVE WRAP ANGLE OF LESS THAN 360 DEGREES ROTATABLY MOUNTED IN SAID BORES AND COMPRISING A MALE ROTOR HAVING LANDS PROVIDED WITH CONVEXLY CURVED FLANKS AND INTERVENING GROOVES THE MAJOR PORTIONS OF WHICH LIE OUTSIDE THE PITCH CIRCLE OF THE MALE ROTOR AND A FEMALE ROTOR HAVING LANDS PROVIDED WITH CONCAVELY CURVED FLANKS AND INTERVENING GROOVES THE MAJOR PORTINS OF WHICH LIE INSIDE THE PITCH CIRCLE OF THE FEMALE ROTOR, THE LANDS AND THE GROOVES OF SAID ROTORS INTERMESHING TO FORM WITH THE CONFRONTING PORTIONS OF SAID HOUSING STRUCTURE CHEVRON-SHAPED COMPRESSION CHAMBERS EACH COMPRISED OF COMMUNICATING PORTIONS OF A MALE ROTOT GROOVE AND A FEMALE ROTOR GROOVE, SAID CHAMBERS BEING DEFINED AT THEIR BASE ENDS BY AN AXIALLY FIXED TRANSVERSE PLANE AT WHICH SAID HIGH PRESSURE PORT IS LOCATED AND AT THEIR APEX ENDS BY THE LANDS OF THE ROTORS COMING INTO MESH AT THE LOW PRESSURE ENDS THEREOF TO PROVIDE PLACES OF INTERMESH TRAVELING AXIALLY TOWARD SAID TRANSVERSE PLANE AS THE ROTORS REVOLVE TO DECREASE THE VOLUMES OF THE CHAMBERS, THE WALLS OF THOSE PORTIONS OF SAID BORES CONSTITUTED BY THE SAID CONFRONTING PORTIONS OF SAID HOUSING STRUCTURE BEING RADIALLY SPACED FROM THE CRESTS OF THE LANDS OF THE RESPECTIVE ROTORS TO PROVIDE CLOSE RUNNING CLEARANCES BETWEEN THE RELATIVELY MOVABLE PARTS CAPABLE OF BEING CLOSED BY A FILM OF SEALING LIQUID, SUBSTNATIALLY ALL OF THE REMAINING PORTIONS OF THE WALLS OF SAID BORES BEING RELIEVED TO PROVIDE SPACING BETWEEN THE RELIEVED PART OF SAID REMAINING PORTIONS AND THE CRESTS OF SAID ROTORS, SAID SPACING HAVING A RADIAL EXTENT MANY TIMES THAT OF SAID RUNNING CLEARANCES AND SUFFICIENTLY GREAT TO PRECLUDE ANY SEALING EFFECT BETWEEN THE ROTORS AND THE RELIEVED PART OF THE WALLS AND MEANS FOR SUPPLYING LIQUID TO SAID COMPRESSOR FOR SEALING SAID RUNNING CLEARANCES AND COOLING THE CONTENTS OF SAID CHAMBERS.