Rotary kinetic fluid motors or pumps – Selectively adjustable vane or working fluid control means – Upstream of runner
Patent
1987-12-23
1989-02-07
Garrett, Robert E.
Rotary kinetic fluid motors or pumps
Selectively adjustable vane or working fluid control means
Upstream of runner
415 49, F01D 1708
Patent
active
048028177
ABSTRACT:
A centrifugal pump having a self-regulating impeller discharge shutter which controls the size of flow passages from the pump impeller to the volute according to the flow demand on the pump. When the pump is operating at the design flow rate, the flow passages can be nearly fully open and, when there is a lesser demand, the area of the flow passages can be correspondingly reduced to improve stability and minimize the temperature rise within the pump. The position of the impeller discharge shutter is automatically controlled by exposure to the static pressure at the tip of the impeller and the pressure in the volute which exert oppositely-acting forces on the impeller discharge shutter.
REFERENCES:
patent: 2846185 (1958-08-01), Widmer
patent: 3784318 (1974-01-01), Davis
patent: 4643639 (1987-02-01), Caine
Garrett Robert E.
Kwon John T.
Sundstrand Corporation
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