Multi-stage ring type centrifugal pumps with inducer means

Details Multi-stage ring type centrifugal pumps with inducer means Multi-stage ring type centrifugal pumps with inducer means

1976-11-18

1978-06-27

Croyle, Carlton R.

Rotary kinetic fluid motors or pumps

Plural runners having different type flow paths

4151996, 415DIG3, 416177, 416183, F04D 2944, F01D 522

Patent

active

040971864

ABSTRACT:
Multi-Stage ring type centrifugal pumps for pumping fluids are adapted to receive an inducer shaped and sized generally but not necessarily to replace the impeller and diffuser of the first pumping stage of the given centrifugal pump. The preferred type of inducer for this use has an enlarged inlet diameter, at least two inducer vanes; an outlet diameter less than the inlet diameter to provide generally convergent flow passages, and the selected inlet vane angle for the inducer vanes will provide a positive incidence angle to increase the pressure at the suction inlet of the associated stage impeller into which the fluid being pumped is delivered.
The inductor is shown in various forms. One embodiment includes an integral hub, inducer vanes and outer shroud. A second male type embodiment includes an integral hub and inducer vanes, and an operatively associated fixed outer shroud matched to the outer periphery of the inducer vanes. A third female type embodiment includes an integral outer shroud and inducer vanes, and an operatively associated separate shaft sleeve matched to the inner periphery of the inducer vanes. Where the outer shroud is rotatable as in the first and second embodiment the inducer is provided with a wearing ring sealing assembly to retain the pressure developed by the inducer.

REFERENCES:
patent: 1080655 (1913-12-01), Richardson
patent: 3221661 (1965-12-01), Swearingen
patent: 3522997 (1970-08-01), Rylewski

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