Multistage centrifugal pump with an upstream (booster) DEVICE

摘要

The invention relates to the field of gidromashinostroeniya and can be used for supplying the feedwater to the power units of thermal and nuclear power plants. Casing Multistage Centrifugal Pump - section design with guide vanes and impellers. Upstream apparatus includes an upstream axial impeller and the guide vane unit and installed on the pump inlet in the inlet cover. The supply of fluid pump apparatus formed axial. The sliding bearing cap side inlet formed in the pumped fluid and is placed in the sleeve the guide apparatus. The variant in which the wheel predklyuchennogo axial sleeve is shaped with increasing from the inlet to the outlet diameter, and blade system upstream of the axial blade wheel has a density grating in the outer diameter in the range 2.0-4.0. In addition, paddle wheel system upstream axial multi-row can be performed, and the blade guide vane system - multistage. The technical result - an increase of the suction capacity and the possibility of operating without the additional pump upstream of the pump. ZP 3, 6 yl.