Patent ID: 8469671

Claim:
Impeller, made of plastics, having a closed construction form, for a centrifugal pump in a motor vehicle cooling system, wherein the impeller is a one-piece plastic part, whose width of the blade channel, in the meridian section, continuously increases from the flow entry into the impeller to the flow exit out of the impeller, in such a manner that the ratio of the exit width (b 2 ) to the entry width (b 1 ) lies in the range between 1.01 and 1.2, wherein the impeller has simply curved blades or spatially curved blades, which are arranged between a bottom and a top, and whereat the bottom, the blades and the top form the one-piece impeller; and wherein a degree of hydraulic effectiveness of up to 87% can be achieved with closed (rapid-running) impellers having spatially curved blades.