Pump device

Claim 1

IN COMBINATION, A LIQUID RING COMPRESSOR HAVING A RING OF LIQUID CIRCULATING THEREIN AND A RECIRCULATING SEAL LIQUID SUPPLY SYSTEM, SAID COMPRESSOR INCLUDING; A CASING, AND ANNULAR ROTOR HAVING A PLURALITY OF RADIALLY EXTENDING DISPLACEMENT CHAMBERS ROTATABLY MOUNTED WITHIN SAID CASING TO FORM AT LEAST ONE PUMPING LOBE THEREBETWEEN AND A STATIONARY CENTRAL PORT MEMBER HAVING INLET AND DISCHARGE PASSAGEWAYS COOPERATIVE WITH THE INSIDE DIAMETER OF SAID ROTOR, SAID RECIRCULATING SEAL LIQUID SUPPLY SYSTEM COMPRISING; A SEAL LIQUID BLEED CHAMBER IN SAID CASING IN DIRECT COMMUNICATION WITH EACH LOBE AND CONDUIT MEANS CONNECTING EACH CHAMBER WITH A RADIALLY INWARD PORTION OF SAID CASING ADJACENT THE END OF SAID ROTOR FOR RECIRCULATING SEAL LIQUID FROM THE LOBE TO THE AREA ADJACENT THE ROTOR ENDS TO SEAL THE OPERATING CLEARANCES BETWEEN SAID ROTOR AND SAID CASING AND BETWEEN SAID ROTOR AND SAID CENTRAL PORT MEMBER, SAID CONDUIT MEANS HAVING A TERMINAL PORTION ADAPTED TO COMMUNICATE SAID COMPRESSOR WITH A PRESSURE RESPONSIVE MEANS FOR SUPPLYING EXCESSIVE COOLING LIQUID TO SAID COMPRESSOR WHEN SAID COMPRESSOR OPERATES ABOVE THE NORMAL OPERATING DISCHARGE PRESSURE THEREOF AND FOR PERMITTING EGRESS OF COOLING LIQUID WHEN SAID COMPRESSOR IS OPERATING AT PRESSURES BELOW SAID NORMAL DISCHARGE PRESSURES THEREOF.