초록

A high speed liquid vortex pump is fitted with a flexible tube in the discharge throat. The flow area of the flexible tube, and thus the pump output flow rate, is varied by surrounding the tube with a pressure modulated stream of the working fluid.

대표청구항 ▼

A rotary fluid pump comprising in combination: a housing forming a generally cylindrical pump bowl therein; said housing having a fluid inlet aligned with the longitudinal axis of said generally cylindrical pump bowl and in communication therewith; an impeller located within, and rotatable about the

A rotary fluid pump comprising in combination: a housing forming a generally cylindrical pump bowl therein; said housing having a fluid inlet aligned with the longitudinal axis of said generally cylindrical pump bowl and in communication therewith; an impeller located within, and rotatable about the longitudinal axis of, said bowl; said impeller having a plurality of radially extending blades; a fluid outlet in said housing extending tangentially from the periphery of said pump bowl and having a first, generally tubular, throat section, in communication with said bowl, and a second outwardly diverging conical section downstream of said first section; a flexible tube making up at least a portion of said throat section; a pressure chamber within said housing and surrounding at least a portion of said flexible tube; a control passage within said housing and in flow communication between said pressure chamber and said pump bowl; and valve means within the flow path of said control passage for adjusting the pressure of fluid in said pressure chamber whereby the cross-sectional flow area of said flexible tube may be reduced by increasing the fluid pressure in said chamber sufficiently to partially collapse said tube.