Regulating means for rotary piston compressor

Claim 1

A ROTARY PISTON, POSITIVE DISPLACEMENT, ELASTIC FLUID COMPRESSOR COMPRISING A HOUSING STRUCTURE PROVIDING A BARREL PORTION HAVING INTERSECTING BORES WITH COPLANAR AXES AND A HIGH PRESSURE END WALL AND FURTHER PROVIDING A HIGH PRESSURE DISCHARGE PORT AT SAID END WALL, AT LEAST THE MAJOR PART OF SAID PORT BEING LOCATED ON ONE SIDE OF THE PLANE OF SAID AXES CONSTITUTING THE HIGH PRESSURE SIDE OF THE COMPRESSOR AND AN INLET COMMUNICATING WITH THE ENDS OF SAID BORES REMOTE FROM SAID HIGH PRESSURE END WALL, MALE AND FEMALE ROTORS PROVIDED WITH INTERMESHING HELICAL LANDS AND GROOVES HAVING AN EFFECTIVE WRAP ANGLE OF LESS THAN 360* ROTATABLY MOUNTED IN SAID BORES AND OPERATIVE TO SEQUENTIALLY FORM WITH THE CONFRONTING PORTION OF THE HOUSING STRUCTURE ON THE LOW PRESSURE SIDE OF SAID PLANE A SERIES OF CHEVRON SHAPED SUCTION CHAMBERS EXPANDING FROM MINIMUM VOLUME AT THE INLET ENDS OF THE ROTORS TO MAXIMUM VOLUME AS THE PLACES OF INTERMESH FORMING THE APEXES OF SAID CHAMBERS MOVE AXIALLY AWAY FROM SAID INLET ENDS AS THE ROTORS REVOLVE UNTIL THE LANDS AND GROOVES MOVE OUT OF MESH AT SAID HIGH PRESSURE END WALL, SAID LANDS AND GROOVES SUBSEQUENTLY INTERMESHING AT THE INLET ENDS OF THE ROTORS ON SAID HIGH PRESSURE SIDE AS THE ROTORS REVOLVE TO SEQUENTIALLY FORM WITH THE CONFRONTING PORTION OF THE HOUSING STRUCTURE A SERIES OF CHEVRON SHAPED COMPRESSION CHAMBERS RUNNING OUT TO MINIMUM VOLUME AT SAID HIGH PRESSURE END WALL AS THE PLACES OF INTERMESH FORMING THE APEXES OF SAID COMPRESSION CHAMBERS MOVE AXIALLY AWAY FROM THE INLET ENDS OF THE ROTORS TO SAID HIGH PRESSURE END WALL, AND REGULATING MEANS FOR BLEEDING SAID GROOVES TO A LOW PRESSURE ZONE TO CONTROL THE CAPICITY OF THE COMPRESSOR COMPRISING BLEED PORT MEANS IN SAID HIGH PRESSURE END WALL, SAID PORT MEANS BEING LOCATED TO REGISTER WITH EACH OF THE GROOVES OF AT LEAST ONE OF SAID ROTORS IN POSITIONS OF THE GROOVE OUT OF COMMUNICATION WITH SAID DISCHARGE PORT FROM THE POSITION AT WHICH THE COMPRESSION CHAMBER OF WHICH THE GROOVE FORMS A PART IS AT MIXIMUM VOLUME TO A POSITION AT WHICH THE VOLUME OF THE LAST MENTIONED CHAMBER HAS BEEN REDUCED TO THE EXTENT REQUIRED TO EFFECT THE DESIRED REGULATION AND BLEED VALVE MEANS CAPABLE OF SELECTIVE ADJUSTMENT DURING OPERATION OF THE COMPRESSOR TO CLOSE SAID PORT MEANS TO DETERMINE THE VOLUMES OF SAID COMPRESSION CHAMBERS WHEN COMPRESSION IS INITIATED THEREIN TO THEREBY REGULATE THE CAPACITY OF THE COMPRESSOR.