Rotary pump

Claim 1

A ROTARY SLIDING VANE PUMP HAVING AN AXIS OF ROTATION COMPRISING A ROTOR HAVING AN AXIAL LENGTH AND A RIGHT CIRCULAR CYLINDRICAL EXTERIOR SURFACE CONCENTRIC OF SAID AXIS AND A SMALL DIAMETER INTERIOR CYLINDRICAL SURFACE COMPRISING A CONCENTRIC HOLLOW BEARING EXTENDING THE WHOLE LENGTH OF THE ROTOR, NON-RADIAL VANE SLOTS PARALLEL WITH SAID AXIS AND OPENING THROUGH SAID EXTERIOR SURFACE AND LYING APPROXIMATELY TANGENT TO SAID BEARING SURFACE AND HAVING THEIR ROOTS PROXIMATE SAID BEARING, VANES SLIDABLE IN SAID SLOTS, SAID ROTOR ALSO HAVING AXIALLY EXTENDING HOLES SYMMETRICALLY DISPOSED ABOUT SAID AXIS AND SPACED ABOUT MIDWAY BETWEEN SAID CYLINDRICAL BEARING SURFACES AND ABOUT MID-WAY BETWEEN ADJACENT VANE SLOTS, A RING SURROUNDING SAID ROTOR COAXIALLY AND SYMMETRICALLY AND OF APPROXIMATELY THE SAME LENGTH AS SAID ROTOR AND HAVING A NONCIRCULAR BORE DESCRIBING TWO LOBES WITH SAID ROTOR AND TWO DIAMETRICALLY INTERPOSED ARCUATE SEALING ZONES IN SLIDING CONTACT WITH SAID ROTOR AND HAVING DIAMETRICALLY OPPOSITE INLET AND OUTLET PORTS RESPECTIVELY OPENING THROUGH SAID BORE ADJACENT SAID ZONES AND ALSO OPENING AT LONGITUDINALLY OPPOSITE ENDS OF SAID RING ADJACENT SAID ZONES, SAID RING HAVING AN IMPERFORATE EXTERIOR OF APPROXIMATELY COAXIAL CYLINDRICAL FORM AND WITH GREATER WALL THICKNESS COMPRISING SAID PORTS, INLET AND OUTLET PLATES SLIDABLY ENGAGING THE OPPOSITE ENDS OF SAID RING AND HAVING PORTS SELECTIVELY CORRESPONDING TO THE INLET AND OUTLET PORTS IN THE ENDS OF SAID RING RESPECTIVELY AND CLOSING ADJACENT PORTS OF OPPOSITE EFFECT RESPECTIVELY, SAID INTAKE PLATE HAVING AUXILIARY PORTS OPENING TO THE SAID LOBES RESPECTIVELY ADJACENT SAID INTAKE PORTS OF SAID RING, SAID PLATES EACH HAVING AN INNER CENTRAL OPENING SMALLER THAN THE EXTERIOR OF SAID ROTOR, INTAKE AND EXHAUST HOUSINGS CLOSING THE LONGITUDINAL ENDS OF SAID PUMP AND HAVING AIR-TIGHT ENGAGEMENT WITH SAID PLATES AND EACH HAVING AN ANNULAR CHAMBER COMMUNICATING WITH THE PORTS IN SAID PLATES RESPECTIVELY AND HAVING EXTERNAL INLET AND OUTLET CONNECTIONS FOR SAID CHAMBERS RESPECTIVELY DISPOSED WITHIN APPROXIMATELY THE ENVELOPE OF THE EXTERIOR OF SAID RING, SAID EXHAUST HOUSING HAVING AN INTEGRAL AXIAL JOURNAL FOR ROTATABLY SUPPORTING SAID ROTOR FOR ROTATION ABOUT SAID AXIS AND DISPOSED IN AND FOR SUBSTANTIALLY THE FULL LENGTH OF SAID INTERNAL BEARING IN THE ROTOR, THE SAID CENTRAL OPENING IN THE EXHAUST PLATE CLEARING SAID JOURNAL AND OPENING TO SAID EXHAUST CHAMBER TO THE ROOTS OF SAID SLOTS AND TO SAID BEARING, SAID INLET HOUSING HAVING AN INTERNAL BEARING ALIGNED ON SAID AXIS AND SEALED-OFF FROM THE SAID INLET CHAMBER IN SAID HOUSING, A DRIVING DISC ADJACENT THE CENTRAL OPENING OF SAID EXHAUST PLATE AND HAVING AN AXIALLY EXTENDING HOLLOW JOURNAL ROTATABLY SUPPORTED IN SAID HOUSING BEARING AND HAVING SYMMETRICALLY SPACED PINTLES EXTENDING INTO SAID HOLES INTO SAID ROTOR AND IN DRIVING ENGAGEMENT WITH SAID ROTOR, SAID HOLLOW JOURNAL HAVING INTERNAL SPLINES, AND A DRIVING COUPLING HAVING SPLINED ENGAGEMENT THEREWITH, THE CONTOUR OF THE INTERIOR OF SAID BORE COMPRISING SEQUENTIAL SEGMENTS DESCRIBED BY A PLURALITY OF EQUATIONS OF THE FOLLOWING GENERAL FORM;