Rotary compressors

Claim 1

A ROTARY PISTON, POSITIVE DISPLACEMENT, ELASTIC FLUID COMPRESSOR HAVING A HOUSING STRUCTURE INCLUDING A BARREL PORTION COMPRISED OF INTERSECTING BORES WITH COPLANAR AXES PROVIDING A WORKING SPACE EXTENDING LONGITUDINALLY OF SAID BARREL PORTION, SAID 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 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, ROTORS PROVIDED WITH HELICAL LANDS AND GROOVES HAVING AN EFFECTIVE WRAP ANGLE OF LESS THAN 360* 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 PORTIONS OF WHICH LIE INSIDE THE PITCH CIRCLE OF THE FEMALE ROTOR, THE LANDS AND 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 ROTOR 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 INTERMESHING LANDS OF THE ROTORS AND SAID APEX ENDS MOVING AXIALLY TOWARD SAID FIXED PLANE AND SAID CHAMBERS COMING INTO COMMUNICATION WITH SAID HIGH PRESSURE PORT AS THE ROTORS REVOLVE TO CAUSE SAID CHAMBERS TO RUN OUT TO ZERO VOLUME AT SAID FIXED PLANE, AND MEANS FOR SUPPLYING LIQUID TO SAID WORKING SPACE FOR SEALING THE PERIMETERS OF SAID CHAMBERS AND COOLING THE CONTENTS THEREOF AT A RATE SUCH THAT THE RATIO OF MASS FLOW OF SAID LIQUID TO THE MASS FLOW OF THE ELASTIC FLUID BEING COMPRESSED LIES WITHIN A RANGE OF WHICH THE LOWER LIMIT IS SUBSTANTIALLY 1.5 TO 1 AND THE UPPER LIMIT IS SUBSTANTIALLY 10 TO 1.