Magnetic pumps for use in refrigeration systems

Claim 1

IN A MAGNETIC DRIVE PUMP UTILIZING A PORTION OF THE PUMPED FLUID AS A COOLANT AND A LUBRICANT FOR USE IN A LOCATION IN WHICH THE PUMPED FLUID MAY BE CONTAMINATED WITH FOREIGN MATERIALS SUCH AS AN ABSORPTION REFRIGERATION SYSTEM, THE COMBINATION OF A PUMP CASING, SAID CASING HAVING AN INLET AND AN OUTLET AND A CENTRAL PARTITION THEREIN, A BEARING MOUNTED IN THE CENTRAL PARTITION OF SAID CASING, AN IMPELLER SHAFT OPERATIVELY ASSOCIATED WITH SAID BEARING, SAID SHAFT HAVING A RADIALLY EXTENDING FLANGE ON ONE END THEREOF, AN IMPELLER WHEEL SUITABLY AFFIXED TO THE OTHER END OF SAID SHAFT, FIRST MAGNETIC MEANS MOUNTED ON THE RADIALLY EXTENDING PORTION OF SAID SHAFT, A DIAPHRAGM MOUNTED ON SAID CASING SERVING AS AN END CLOSURE THEREFOR AND FORMING WITH SAID PARTITION AN ENCLOSURE, SAID FIRST MAGNETIC MEANS BEING IN CLOSE PROXIMITY THERETO, A MOTOR, SECOND MAGNETIC MEANS MOUNTED ON ONE END OF SAID MOTOR MAGNETICALLY COUPLED TO SAID FIRST MAGNETIC MEANS FOR DRIVING SAID SHAFT, SAID SHAFT HAVING FLUID PASSAGES THEREIN COMMUNICATING BETWEEN THE CASING INLET AND THE ENCLOSURE FORMED BETWEEN THE CENTRAL PARTITION OF SAID CASING AND SAID DIAPHRAGM SO THAT A PORTION OF THE FLUID BEING PUMPED MAY FLOW THROUGH THE CLEARANCE BETWEEN SAID BEARING AND SAID SHAFT INTO THE AFOREMENTIONED ENCLOSURE AND THEN THROUGH THE SHAFT PASSAGES TO THE CASING INLET.