Method and apparatus for controlling recirculation in a centrifu

Details Method and apparatus for controlling recirculation in a centrifu Method and apparatus for controlling recirculation in a centrifu

1982-09-30

1985-01-08

Favors, Edward G.

Rotary kinetic fluid motors or pumps

With means for re-entry of working fluid to blade set

Cross flow runner

415 53R, 415213T, F01D 112

Patent

active

044925166

ABSTRACT:
S-shaped passageways are provided for reinjecting fluid from the discharge of a centrifugal pump to the impeller inlet of the pump, in order to prevent recirculation and the cavitation damage that results from recirculation. The S-shaped passageways impart a rotation to the reinjected fluid which is opposite to the direction of rotation of the impeller. The S-shaped passageways have intake openings near the discharge tips of the impeller which are adapted to receive fluid so that the momentum of the fluid, as it is expelled from the impeller, will carry the fluid directly into the intake of the S-shaped passageways. The S-shaped passageways are shaped to redirect the flow of the fluid to be reinjected so that the fluid exits the S-shaped passageways at the inlet of the impeller in a direction which is at a generally small angle of attack with respect to the impeller vanes. The S-shaped passageways are arranged in side-by-side relation to form an annular reinjection port.

REFERENCES:
patent: 933906 (1909-09-01), Illy
patent: 2341163 (1944-02-01), Schjolin
patent: 2611241 (1952-09-01), Schulz
patent: 2865297 (1958-12-01), Cliborn et al.
patent: 3751178 (1973-08-01), Paugh et al.
patent: 4027993 (1977-06-01), Wolff

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