초록 ▼

The pump of the present invention has a housing which accommodates an axial impeller set on the pump drive shaft. The impeller has a hub which carries a number of the helical impeller blades held in position thereto and defining a plurality of blade channels for the liquid being handled to pass. An

The pump of the present invention has a housing which accommodates an axial impeller set on the pump drive shaft. The impeller has a hub which carries a number of the helical impeller blades held in position thereto and defining a plurality of blade channels for the liquid being handled to pass. An additional intake axial impeller with the helical impeller blades is set on the pump drive shaft before the axial impeller as viewed in the direction of liquid flow, said additional intake axial impeller having its outside diameter smaller than the outside diameter of the axial impeller, and the lead of helix of the impeller blades thereof is lower than the lead of helix of the impeller blades of the axial impeller at the entry thereof, while the ratio between the outside diameter of the additional intake axial impeller and the outside diameter of the axial impeller, and the ratio between the lead of helix of the impeller blades of the additional intake axial impeller and the lead of helix of the impeller blades of the axial impeller across the outside diameter of both respective impellers are selected so as to provide for high pump suction capacity.

대표청구항 ▼

An axial or worm type centrifugal impeller pump, comprising: a housing; a drive shaft running through said housing; bearings in which said drive shaft is rotatably journalled; an axial impeller mounted on said drive shaft; a hub of said axial impeller; helical blades of said axial impeller fixed on

An axial or worm type centrifugal impeller pump, comprising: a housing; a drive shaft running through said housing; bearings in which said drive shaft is rotatably journalled; an axial impeller mounted on said drive shaft; a hub of said axial impeller; helical blades of said axial impeller fixed on said hub, said blades defining a plurality of blade channels for the liquid being handled to pass; an additional intake axial impeller mounted on said drive shaft forwardly of said axial impeller as viewed along the flow of liquid; a hub of said additional intake axial impeller; helical impeller blades fixed on said hub of said additional intake axial impeller; the outer diameter and the lead of the helix of said helical impeller blades of said additional intake axial impeller being synchronously and correspondingly smaller than the outside diameter and the lead of helix of said helical impeller blades of said axial impeller at the entry thereof; the ratio between the outside diameters of said additional intake axial impeller and said axial impeller as well as the ratio between the leads of helix of said impeller blades of said additional intake axial impeller and said axial impeller across the outside diameters of said respective impellers being selected so as to provide for high pump suction capacity.