Centrifugal pump

Details Centrifugal pump Centrifugal pump

1986-09-11

1987-12-22

Garrett, Robert E.

Rotary kinetic fluid motors or pumps

Including means for handling portion separated from working...

415176, 417366, F01D 2532

Patent

active

047144050

ABSTRACT:
A centrifugal pump has a casing with an impeller cavity in which a shrouded impeller is mounted and with front and rear labyrinth seals associated one with each of the front and rear shrouds of the impeller and located near the inner ends of the shrouds. An additional seal is positioned inwardly of the rear labyrinth seal to substantially seal a space behind the innermost part of the rear shroud and a pump structure is mounted on the impeller to the rear of the rear shroud for pumping fluid from the substantially sealed space to the entrance of a volute surrounding the impeller. The impeller shaft has a front thrust bearing coacting with a bearing surface, with fluid passing therebetween for lubrication and with the flow of the fluid being controlled to a minimal amount by a force imbalance on the impeller shaft created by location of the front and rear labyrinth seals at different distances from the axis of rotation of the impeller whereby pressure forces acting at the rear of the impeller urge the impeller shaft in a forward direction.

REFERENCES:
patent: 1853973 (1932-04-01), Hoffmann
patent: 2704516 (1955-03-01), Mock et al.
patent: 2835203 (1958-05-01), Cliborn
patent: 3031973 (1962-05-01), Kramer
patent: 3128713 (1964-04-01), Nechine
patent: 3146635 (1964-09-01), Brose
patent: 3288073 (1962-11-01), Pezzillo
patent: 3402671 (1968-09-01), Wilfley et al.
patent: 3652186 (1972-03-01), Carter
patent: 3677659 (1972-07-01), Williams
patent: 3734649 (1973-05-01), Sandy, Jr.
patent: 4034560 (1977-07-01), Chute et al.

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