Electrically driven circulating pump

Claim 1

AN ELECTRICALLY DRIVEN CIRCULATING PUMP COMPRISING THE UNITARY ASSEMBLY OF A SEPARATELY FORMED SELF-CONTAINED ELECTRIC MOTOR UNIT AND A SEPARATELY FORMED PIPELINE CONNECTION UNIT, SAID SEPARATELY FORMED SELF-CONTAINED ELECTRIC MOTOR UNIT INCORPORATING A BODY CONSISTING OF AN ENCASEMENT OF A SYNTHETIC PLASTICS MATERIAL POSSESING GOOD ELECTRICAL INSULATING PROPERTIES, GOOD HEAT CONDUCTIVITY AND STRENGTH, A STATOR UNIT EMBEDED IN THE ENCASEMENT , A ROTOR CHAMBER IN THE MASS OF THE ENCASEMENT, A THIN METAL SLEEVE BOUNDING THE ROTOR CHAMBER, ROTOR DISPOSED WITHIN THE ROTOR CHAMBER, A SPINDLE FOR SAID ROTOR, A BEARING FOR THE INNER END OF SAID SPINDLE MOUNTED WITHIN THE ENCASEMENT WHICH ON REMOVAL FOR CLOSING ONE END OF THE ENCASEMENT WHICH ON REMOVAL PERMITS OF ACCESS BEING GAINED TO THE ROTOR CHAMBER FOR EFFECTING THE INSERTION OF AND THE REMOVAL OF THE ROTOR AS REQUIRED, A PUMP IMPELLER FIXED ON THE INNER END OF THE SPINDLE WHICH PROJECTS FROM THE ENCASEMENT BEARING, SAID SEPARATELY FORMED PIPELINE CONNECTION UNIT INCORPORATING LIQUID INLET AND OUTLETS, A PUMP CHAMBER INTERMEDIATE SAID INLET AND OUTLET, MEANS FOR ATTACHING THE SEPARATELY FORMED PIPE CONNECTION UNIT TO T HE SAID SEPARATELY FORMED SELF-CONTAINED ELECTRIC MOTOR UNIT SO THAT THE THE HIGH PRESSURE SIDE OF THE PUMP CHAMBER OF THE IMPELLER THEN BECOMES LOCATED WITHIN THE PUMP CHAMBER, A PASSAGE THROUGH THE ENCASEMENT WHICH LEADS FROM THE HIGH PRESSURE SIDE OF THE PUMP CHAMBER OF THE ASSEMBLY INTO A SPACE AROUND THE OUTER BEARING OF THE SPINDLE AND THENCE INTO THE ROTOR CHAMBER AND A PASSAGE THROUGH THE ENCASEMENT LEADING FROM THE ROTRO CHAMBER TO THE LOW PRESSURE SIDE OF THE PUMP CHAMBER OF THE ASSEMBLY, SAID PASSAGES IN ADDITION TO SERVING TO CONDUCT COOLANT TO AND FROM THE ROTOR CHAMBER AND OUTER SPINDLE BEARING SERVE ALSO TO CIRCULATE COOLANT THROUGH THE MASS OF THE ENCASEMENT.