Centrifugal pump with hydraulic thrust balance and tandem axial

Details Centrifugal pump with hydraulic thrust balance and tandem axial Centrifugal pump with hydraulic thrust balance and tandem axial

1988-02-18

1989-09-19

Powell, Jr., Everett A.

Rotary kinetic fluid motors or pumps

With shaft connected fluid force subjected thrust balancing...

Fluid force on opposite face of blade or blade support member

415113, 4151701, F01D 1100

Patent

active

048676330

ABSTRACT:
A centrifugal pump with hydraulic thrust balance and tandem axial seals. The centrifugal pump has an impeller with front and rear axial seals operating in unison to either reduce or increase the size of gaps therebetween. The gaps are of a minimal dimension to minimize leakage. The rear axial seal is located at the tip of the impeller with the front axial seat located either at the impeller eye or radially outwardly thereof. Hydraulic thrust balance is achieved and continuously maintained by axial movement of the impeller shaft and impeller to modulate the gap at the rear axial seal and, thus, control the value of an effective pressure acting on the back side of the impeller whereby an outward thrust force resulting therefrom counterbalances an inward thrust force resulting from pressure acting on the front shroud of the impeller. A clearance at the rear of the impeller communicates with suction pressure through a restricted passage. Impeller hydraulic thrust balance forces usually dwarf other thrust forces which are considered to be external thrusts without significant impact on overall thrust balance. Examples of external thrusts are those that arise from suction pressure acting over the process seal area and from helical gears in integral gear driven systems. A normally preferred thrust balance design is appropriate for the majority of pump applications, but design alternatives are offered for inordinate pump applications which provide maximum capacities to handle either outward or inward external thrust loads.

REFERENCES:
patent: 1860817 (1932-05-01), Peterson
patent: 4236867 (1980-12-01), Morris
patent: 4538960 (1985-09-01), Iino et al.
Bulletin 1.4 of Sundstrand Fluid Handling Unit of Sundstrand Corporation and which discloses a canned motor pump known more than a year prior to the filing of the subject application.
A sheet showing six Figures with Figures (a) and (b) being taken from a book entitled Centrifugal and Axial Flow Pumps of A. J. Stepanoff, published in 1957; Figures (c) and (d) being taken from a book entitled Pump Handbook, author I. J. Karassik et al., published 1976 and with supplementing pp. 2-64 through 2-67 also being submitted; and Figure (e) taken from a publication of NASA SP-8109, published 1973, entitled Liquid Rocket Engine Centrifugal Flow Turbo Pumps; and Figure (f) is a Figure from a Book entitled Centrifugal Pumps and Blowers, author A. H. Church, published 1944.
Pp. 80-82, publication entitled Power, vol. 118, No. 6 of Jun. 1974.

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