Dynamoelectric machinery for use in high pressure fluid systems

Claim 1

IN A MOTOR-PUMP UNIT, THE COMBINATION COMPRISING A PUMP CASING, IMPELLER MEANS DISPOSED IN SAID PUMP CASING, A ROTATABLY SHAFT EXTENDING THROUGH AN OPENING IN SAID CASING AND HAVING ONE END THEREOF SECURED TO SAID IMPELLER MEANS WITH A SUBSTANTIAL PORTION OF SAID SHAFT DISPOSED OUTWARDLY OF SAID PUMP CASING, AN ANNULAR PRESSURE BARRIER SECURED TO SAID PUMP CASING ADJACENT SAID OPENING, SAID PRESSURE BARRIER HAVING THE OPENING THEREIN SURROUNDING A PART OF SAID OUTWARDLY DISPOSED SHAFT PORTION, WHEREBY THE OTHER END OF SAID SHAFT PROJECTS OUTWARDLY FROM SAID PRESSURE BARRIER, A FIRST LIMITED LEAKAGE SEALING MEANS COUPLED TO OPPOSED PORTIONS OF SAID SHAFT PORTION AND SAID PRESSURE BARRIER, SAID FIRST SEALING MEANS BEING FORMED TO PASS A RELATIVELY SMALLER LEAKAGE FLOW THERETHROUGH, A SECOND SEALING MEANS DISPOSED INTERMEDIATE SAID FIRST SEALING MEANS AND SAID IMPELLER AND FORMED TO PERMIT THE FLOW OF A RELATIVELY LARGER QUANTITY OF LEAKAGE FLOW THERETHROUGH, SAID SECOND SEALING MEANS FORMING A LEAKAGE FLUID FLOW PATH IN SERIES WITH THE LEAKAGE FLUID FLOW PATH OF SAID SEALING MEANS, A FIRST ANTIFRICTIONAL MEANS MOUNTED ON EITHER SAID PRESSURE BARRIER OR SAID PUMP CASING FOR ENHANCING ROTATION OF SAID SHAFT AND DISPOSED INTERMEDIATE SAID IMPELLER AND SAID SECOND SEALING MEANS, A SECOND ANTIFRICTIONAL MEANS MOUNTED ON SAID PRESSURE BARRIER FOR AN ENHANCING ROTATION OF SAID SHAFT AND INTERPOSED ON SAID PRESSURE BARRIER INTERMEDIATE SAID FIRST AND SAID SECOND SEALING MEANS, A ROTOR SUPPORTING MEANS REMOVABLY SECURED TO SAID SHAFT AND POSITIONED THEREON INTERMEDIATE SAID PRESSURE BARRIER AND SAID OTHER END OF SAID SHAFT, SAID ROTOR SUPPORTING MEANS OVERLYING SAID PRESSURE BARRIER, A ROTOR STRUCTURE OF ANNULAR CONFIGURATION HAVING AN OPENING THEREOF RECEIVING SAID PRESSURE BARRIER THEREIN, MEANS