Regulating means for rotary piston compressors

Claim 1

A ROTARY PISTON, POSITIVE DISPLACEMENT, ELASTIC FLUID COMPRESSOR COMPRISING A HOUSING STRUCTURE PROVIDING A BARREL PORTION HAVING INTERESTING BORES WITH COPULAR AXES AND A LOW PRESSURE END WALL FURTHER PROVIDING AN INLET PASSAGE TERMINATING IN A MAIN INLET PORT COMMUNICATING WITH ONE END IF SAID BORES ON ONE SIDE OF SAID PLANE CONSTITUTING THE LOW PRESSURE SIDE OF THE COMPRESSOR AND A HIGH PRESSURE DISCHARGE PORT COMMUNICATING WITH SAID BORES ON THE OPPOSITE SIDE OF SAID PLANE CONSITITUTING THE HIGH PRESSURE SIDE OF THE COMPRESSOR AT A PLACE AXIALLY SPACED FROM SAID LOW 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 CONFRONTING PORTION OF THE HOUSING STRUCTURE ON SAID LOW PRESSURE SIDE, A SERIES OF CHEVRON SHAPED SUCTION CHAMBERS EXPANDING FROM MINIMUM VOLUME AT THE INLET ENDS OF SAID ROTORS TO MIXIMUM 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 A FIXED TRANSVERSE PLANE AXIALLY SPACED FROM SAID INLET ENDS AND AT WHICH PLANE SAID DISCHARGE PORT IS LOCATED, 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 TRANSVERSE PLANE AS THE PLACES TO INTERMESH FORMING THE APEXES OF SAID COMPRESSION CHAMBERS MOVE AXIALLY FROM THE INLET ENDS OF THE ROTORS TO SAID TRANSVERSE PLANE, THE SIZE OF SAID MAIN INLET PORT BEING SO LIMITED PERIPHERY THAT THE INLET ENDS OF THE GROOVES FORMING ANY GIVEN SUCTION CHAMBER PASS OUT OF REGISTRY WITH SAID MAIN INLET PORT TO CLOSE THE CHAMBER BEFORE THE GROOVES FORMING THE CHAMBER MOVE OUT OF MESH AT SAID TRANSVERSE PLANE AND WITH THE ROTORS IN A POSITION SUCH THAT THE VOLUME OF THE CHAMBER IS THAT FRACTION OF THE MINIMUM VOLUME WHICH CORRESPONDS TO THE MINUMIM DESIRES PARTIAL CAPACITY OF THE COMPRESSOR AND REGULATING MEANS FOR CONTROLLING THE CAPACITY OF THE COMPRESSOR BETWEEN SAID MINIMUM PARTIAL CAPACITY AND MAXIMUM CAPACITY COMPRISING AUXILIARY INLET PORT MEANS IN SAID LOW PRESSURE END WALL LOCATED TO REGISTER WITH EACH OF THE GROOVES OF AT LEAST ONE OF SAID ROTORS IN POSITIONS OF THE GROOVES OUT OF COMMUNICATION WITH SAID DISCHARGE PORT FROM THE POSITION AT WHICH THE INLET END OF THE GROOVE HAS JUST PASSED OUT OF REGISTRY WITH SAID MAIN INLET PORT TO THE POSITION AT WHICH THE COOPERATING LAND DETERMINING THE APEX END OF THE SUCTION CHAMBER HAS PASSED OUT OF MESH WITH THE GROOVE, THE AUXILIARY INLET VALVE MEANS CAPABLE OF SELECTIVE ADJUSTMENT DURING OPERATION OF THE COMPRESSOR FOR CONTROLLING SAID AUXILIARY INLET PORT MEANS TO REGULATE THE CAPACITY OF THE COMPRESSOR.