Rotary gas compressor

Claim 1

IN A "GEROTOR" COMPRESSOR OF THE TYPE HAVING A LOBED FEMALE ROTOR, A LOBED MALE ROTOR HAVING ONE LESS LOBE THAN SAID FEMALE ROTOR, A HOUSING MEMBER HAVING A BORE IN WHICH SAID FEMALE ROTOR IS ROTATABLY MOUNTED, CLOSURE MEMBERS AT THE SIDES OF SAID HOUSING MEMBER, SAID CLOSURE MEMBERS CARRYING A SHAFT ON WHICH SAID MALE ROTOR IS MOUNTED, SAID BORE AND SAID MALE ROTOR SHAFT MOUNTING BEING ECCENTRIC WITH RESPECT TO EACH OTHER, THE CENTER OF ONE OF SAID ROTORS BEING CONCENTRIC TO SAID SHAFT AND THE CENTER OF THE OTHER ROTOR BEING ECCENTRIC TO SAID SHAFT, ALL LOBES OF ONE OF SAID ROTORS BEING IN SEALING CONTACT WITH THE LOBES OF THE OTHER OF SAID ROTORS AT LEAST ONE OF SAID CLOSURE MEMBERS HAVING AN INLET PORT OF USUAL KIDNEY SHAPE; THE IMPROVEMENT WHICH COMPRISES PROVIDING A DISCHARGE PORT IN AT LEAST ONE OF SAID CLOSURE MEMBERS WHICH IS SUBSTANTIALLY THE PROJECTION OF A FIGURE BOUNDED BY A LINE EXTENDING FROM A POINT LYING ON A CIRCLE ARC HAVING THE ROOT RADIUS OF SAID FEMALE ROTOR, LAID OFF ABOUT A CENTER COINCIDING WITH THE CENTER OF THE CONCENTRICALLY MOUNTED ROTOR, SAID POINT BEING REMOVED IN THE DIRECTION OF ROTATION FROM A DIAMETER EXTENDING THROUGH THE CENTER OF THE MALE AND FEMALE ROTOR LOBE SPACE WHICH IS FILLED AT THE START OF COMPRESSION, AND THROUGH THE CENTERS OF SAID MALE AND FEMALE ROTORS AT THAT POSITION, BY AN ARC COMPRISING THE ARC SUBTENDED BY AN ANGLE MEASURED ABOUT THE CENTER OF SAID ECCENTRICALLY MOUNTED ROTOR WHICH ANGLE IS EQUAL TO THE RATIO OF THE NUMBER OF LOBES IN THE MALE ROTOR TO THE NUMBER OF LOBES IN THE FEMALE ROTOR MULTIPLIED BY THE ANGLE MEASURED ABOUT THE CENTER OF THE CONCENTRICALLY MOUNTED ROTOR AT WHICH THE DESIRED COMPRESSION RATIO OCCURS, AND THE ARC OF SAID ROOT RADIUS CIRCLE SUBTENDED BY A CHORD EQUAL TO THE ECCENTRIC DISTANCE; THENCE INWARDLY ALONG A LINE PARALLEL TO THE RADIAL LINE DEFINING SAID FIRST MENTIONED ANGLE TO A POINT ON A SECOND CIRCLE ARC HAVING A RADIUS EQUAL TO THE OUTER RADIUS OF THE MALE ROTOR, SAID ARC BEING STRUCK ABOUT THE CENTER OF THE CONCENTRICALLY MOUNTED ROTOR; THENCE IN THE DIRECTION OF ROTATION ALONG SAID SECOND CIRCLE ARC TO A POINT AT WHICH THAT ARC IS INTERSECTED BY AN ARC OF THE MALE ROTOR LOBE RADIUS STRUCK FROM THE POINT ON SAID FIRST CIRCLE ARC ANGULARLY SPACED FROM SAID CENTER LINE BY SAID DESIRED COMPRESSION RATIO ANGLE; THENCE ALONG SAID MALE ROTOR LOBE RADIUS ARC IN A DIRECTION GENERALLY COUNTER TO THE DIRECTION OF ROTATION TO THE INTERSECTION OF SAID ARC WITH THE RADIAL LINE EXTENDING TO THE CENTER OF SAID CONCENTRICALLY MOUNTED ROTOR FROM THE POINT FROM WHICH SAID ARC WAS STRUCK; THENCE THROUGH A POINT AT WHICH THE FEMALE LOBE AND MALE LOBE SPACE ARE IN SUBSTANTIALLY COMPLETE ENGAGEMENT TO A POINT ON SAID FIRST CIRCLE ARC REMOVED SUBSTANTIALLY 180* IN THE DIRECTION OF ROTATION FROM THE CENTER LINE OF SAID FILLED ROTOR LOBES; AND THENCE ALONG SAID FIRST CIRCLE ARC TO THE PLACE OF BEGINNING.