Hermetic motor-pump construction

• US 3,225,698 A
• Filed: 11/29/1963
• Issued: 12/28/1965
• Est. Priority Date: 11/29/1963
• Status: Expired due to Term

• Current Assignee: Buffalo Forge Company
• Original Assignee: Daniel R. Spisiak
• Inventors: Spisiak, Daniel R.
• Application Number:
  US04/326,685
• Time in Patent Office: 760 Days
• US Class Current: 417/369
• CPC Class Codes: F04D 13/0613 Special connection between the rotor compartments
• CPC Class Codes: F04D 29/0416 balancing pistons

Claims

1. A HERMETIC MOTOR-PUMP UNIT COMPRISING A HOUSING, A MOTOR INCLUDING A ROTOR AND A STATOR IN SAID HOUSING, A PUMP INCLUDING AN IMPELLER IN SAID HOUSING, A SHAFT HAVING FIRST AND SECOND ENDS, SAID ROTOR BEING MOUNTED ON SAID SHAFT BETWEEN SAID FIRST AND SECOND ENDS, SAID IMPELLER BEING MOUNTED OT ONE SIDE OF SAID ROTOR PROXIMATE SAID FIRST END OF SAID SHAFT, FIRST AND SECOND BEARING MEANS FRO MOUNTING SAID SHAFT ON SAID HOUSING, SAID FIRST BEARING MEANS BEING LOCATED TO ONE SIDE OF SAID ROTOR PROXIMATE SAID IMPELLER AND SAID SECOND BEARING MEANS BEING LOCATED ON THE OPPOSITE SIDE OF SAID ROTOR FROM SAID IMPELLER PROXIMATE SAID SECOND END OF SAID SHAFT, CIRCUIT MEANS FOR CONDUCTING A PORTIONOF FLUID WHICH IS PUMPED BY SAID IMPELLER ACROSS SAID ROTOR, ORIFICE MEANS IN SAID HOUSING LOCTED PROXIMATE SAID SECOND END OF SAID SHAFT, SAID ORIFICE MEANS BEING AXIALLY SPACED ON THE OPPOSITE SIDE OF SAID SECOND BEARING MEANS FROM SAID ROTOR, AND A TAPER FORMED RELATIVE TO SAID SECOND END OF SAID SHAFT AND AXIALLY SPACED BETWEEN SAID SECOND BEARING MEANS AND SAID ORIFICE MEANS FOR VARYING THE EFFECTIVE OPENING OF SAID ORIFICE MEANS IN RESPONSE TO AXIAL MOVEMENT OF SAID SHAFT RELATIVE TO SAID ORIFICE MEANS TO THEREBY VARY THE RATE OF FLUID FLOW THROUGH SAID ORIFICE MEANS AND THEREBY CAUSE SAID SHAFT TO CEASE AXIAL MOVEMENT WHEN A FIRST AXIAL THRUST FORCE IS PRODUCED ON SAID ROTOR DUE TO THE PRESSURE DROP OF FLUID THEREACROSS WHICH IS EQUAL AND OPPOSITE TO A SECOND AXIAL THRUST FORCE WHICH IS DUE TO ROTATION OF SAID IMPELLER, THE LOCATION OF SAID TAPER AND SAID ORIFICE MEANS CONTRIBUTING TO THE EXISTENCE OF FLUID AT SAID SECOND BEARING MEANS REGARDLESS OF THE FLOW THROUGH SAID ORIFICE MEANS.