Pump

Claim 1

A WET MOTOR PUMP COMPRISING A PUMP CASING HAVING AN IMPELLER CHAMBER AND AN INLET AND OUTLET COMMUNICATING WITH THE IMPELLER CHAMBER, AN ELECTRIC MOTOR HAVING A HOUSING WITH A ROTOR THEREIN AND A SHAFT ROTATABLY DRIVEN BY SAID ROTOR WITH SAID SHAFT PROJECTING FROM ONE END OF THE HOUSING, BEARING MEANS WITHIN SAID HOUSING FOR ROTATABLY JOURNALING SAID ROTOR, MEANS FOR SEALINGLY CONNECTING THE MOTOR HOUSING AND PUMP CASING TOGETHER WITH SAID SHAFT EXTENDING INTO SAID IMPELLER CHAMBER, AN IMPELLER POSITIONED WITHIN THE IMPELLER CHAMBER AND DRIVINGLY CONNECTED TO SAID SHAFT, AND SEAL MEANS FOR PROVIDING A SEAL AROUND SAID SHAFT ADJACENT TO SAID ONE END OF THE MOTOR HOUSING TO COMPLETELY SEAL SAID HOUSING AGAINST FLUID CIRCULATING INTO THE INTERIOR OF THE MOTOR HOUSING, SAID SHAFT HAVING PASSAGEWAY MEANS THEREIN COMMUNICATING A CHAMBER WITHIN THE MOTOR HOUSING WITH THE IMPELLER CHAMBER, SAID BEARING MEANS COMMUNICATING WITH SAID MOTOR CHAMBER WHICH CAN BE FILLED WITH THE FLUID BEING PUMPED FOR LUBRICATING AND COOLING SAID BEARING MEANS AND WHEREIN THE FLUID WITHIN SAID MOTOR CHAMBER CAN COMMUNICATE WITH THE FLUID IN THE IMPELLER CHAMBER IN A MANNER TO COMPENSATE FOR CHANGES IN VOLUME OF THE FLUID WITHIN SAID MOTOR CHAMBER.