IMPELLER PUMP Russian patent published in 2012 - IPC F04D29/58 

FIELD: engines and pumps.

SUBSTANCE: impeller pump with side supply of working fluid includes inlet branch pipe 1, annular inlet header 2, shaft 3 passing through header 2, and blade wheel 4, screw pump 5, bearing 6 and impeller 7, which are installed in series on the shaft. In header 2 there made are holes 8 for connection of cavity of header 2 to cavities 9 and 10 of bearing and impeller. In addition, the pump is equipped with chamber 11 of high reduced pressure above chamber of impeller 7 and mixing chamber 12 between bearing 6 and impeller 7. Chamber 11 is interconnected with cavity 10 by means of tangential divergent holes 13 and with mixing chamber 12 by means of radial convergent holes - injectors 14. Besides, chamber 12 is interconnected through holes 8 with inlet header 2 and through gap 15 along the shaft with cavities 9 and 10 of bearing 6 and impeller 7. With such design, the fluid pressure before the bearing rises, and as a result, fluid pressure rises on both sides of screw pump; suction capacity of impeller pumps also increases at higher revolutions of the shaft.

EFFECT: enlarging the application area and increasing the economy of the pump.

4 dwg