Multistage canned motor pump having a thrust balancing disk

Details Multistage canned motor pump having a thrust balancing disk Multistage canned motor pump having a thrust balancing disk

1994-11-30

1997-01-07

Thorpe, Timothy S.

Pumps

Motor driven

Axial thrust balancing means for rotary pump and motor

417370, 417366, 415104, F04B 1700

Patent

active

055910165

ABSTRACT:
A multistage canned motor pump comprising a pump section including a plurality of pump chambers and a motor section behind the pump section, both the sections having in common a single rotation shaft, and further a balance disk between the pump and motor sections, wherein an external circulation system is provided so that a part of a treating liquid discharged from a last stage pump chamber is circulated from a front rotor chamber through a pressure chamber accommodating the balance disk to a rear rotor chamber while the remaining part of the treating liquid is supplied to a rear bearing section for lubrication of the bearing section and further circulated through an external pipe to a pump section port for cooling of the motor section, and wherein an annular balance sheet is provided a verge at a high pressure side of the balance disk in the pressure chamber to control a flow rate of the treating liquid to thereby reduce a pressure of a circulation flow of the treating liquid toward the motor section.

REFERENCES:
patent: 2809590 (1957-10-01), Brown
patent: 3220349 (1965-11-01), White
patent: 3288073 (1966-11-01), Pezillo
patent: 3664758 (1972-05-01), Sato
patent: 3746461 (1973-07-01), Yokota
patent: 4115038 (1978-09-01), Litaenberg
patent: 5009578 (1991-04-01), Hyland
patent: 5340272 (1994-08-01), Fehlau

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