Motor driven pump

• US 3,220,349 A
• Filed: 09/09/1964
• Issued: 11/30/1965
• Est. Priority Date: 09/09/1964
• Status: Expired due to Term

• Current Assignee: Howard T. White
• Original Assignee: Howard T. White
• Inventors: White, Howard T.
• Application Number:
  US04/395,136
• Time in Patent Office: 447 Days
• US Class Current: 417/357
• CPC Class Codes: F04D 13/0613 Special connection between the rotor compartments
• CPC Class Codes: F04D 29/0416 balancing pistons

Claims

1. IN A MOTOR DRIVEN PUMP, A PUMP HOUSING HAVING AN IMPELLER CHAMBER WITH AN IMPELLER THEREIN, A MOTOR HOUSING EXTENDING FROM SAID PUMP HOUSING AND HAVING AN INTERIOR SLEEVE PROVIDING A MOTOR STATOR CHAMBER, A MOTOR STATOR IN SAID MOTOR STATOR CAMBER, THE INTERIOR OF SAID SLEEVE PROVIDING A MOTOR ROTOR CHAMBER, A MOTOR ROTOR IN SAID MOTOR ROTOR CHAMBER HAVING A PERIPHERAL PORTION WITH CLEARANCE WITH RESPECT TO SAID SLEEVE TO PROVIDE A FIXED ORIFICE AND HAVING AN END FACE PORTION AT ITS END REMOTE FROM THE IMPELER, A SHAFT IN SAID MOTOR AND PUMP HOUSINGS ON WHICH SAID MOOTR ROTOR AND SAID IMPELLER ARE MOUNTED, END MEMBERS IN SAID SLEEVE AT THE ENDS THEREOF, SAID MOTOR ROTOR CHAMBER AT ONE END BEING IN COMMUNICATION WITH SAID IMPELLER CHAMBER FOR THE DELIVERY OF FLUID TO SAID MOTOR ROTOR CHAMBER, SAID END MEMBERS HAVING A BEARING FOR SAID SHAFT, THE SPACE BETWEEN ONE OF SAID END MEMBERS AND SAID END FACE PORTION PROVIDING A PRESSURE BALANCING CHAMBER WITH A FORCE EXERTED ON SAID END FACE BY THE PRESSURE IN SAID CHAMBER IN OPPOSITION TO AN AXIAL FORCE EXERTED BY SAID IMPELLER, SAID PRESSURE BALANCING CHAMBER HAVING SAID FIXED ORIFICE IN COMMUNICATION THEREWITH, SAID SHAFT HAVING A FLUID PASSAGEWAY THERALONG IN COMMUNICATION AT ONE END WITH SAID PRESSURE BALANCING CHAMBER, SAID SHAFT HAVING A DISCHARGE OPENING CONNECTED TO SAID FLUID PASSAGEWAY, AND RELATIVELY MOVABLE PORTIONS ON SAID IMPELLER AND IN SAID PUMP HOUSING PROVIDING THERE BETWEEN A VARIABLE ORIFICE FOR CONTROLLING THE PRESSURE CONDITIONS IN SAID PRESSURE BALANCING CHAMBER, SAID IMPELLER HAVING A RETURN PASSAGEWAY WITH WHICH SAID VARIABLE ORIFICE IS IN COMMUNICATION.