Ksb Aktiengesellschaft

Christian Haag

Wolfgang Kochanowski

Thomas Pensler

Christoph Jaeger

Rolf Witzel

Peer Springer

A centrifugal pump with an impeller which has a single helically-formed blade and which is not sensitive to sand abrasion or seizing of the impeller is achieved by providing the impeller ( ) with a shielding plate ( ) arranged on the suction side which transitions from an axial course given at the suction inlet of the impeller into a radial course, by providing that the blade entry angle (&bgr; ) in the area which is in danger of cavitation in the event of an abrupt onset of flow is at least 5&deg; smaller than the angle of incident flow (&bgr; ), and thereafter the blade angle &bgr; in the axial region of a meridian section through the impeller ( ) increases at least to the magnitude of the blade exit angle (&bgr; ), and finally a blade angle (&bgr;) exceeding the blade exit angle (&bgr; ) in the radial area of the meridian section decreases back down to the magnitude of the blade exit angle (&bgr; ).

Centrifugal pump

An impeller of a centrifugal pump for transporting dirty liquids has transport elements, for example back-vanes or grooves disposed on the pressure side of a cover disk. The transport elements are arranged asymmetrically and are limited to one arc sector of the cover disk to create a transverse stream that rotates with the impeller. Solids which have penetrated into the space to the side of the wheel are carried out by this stream in the direction of the transport elements.

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Halle/Saale, Germany

Christian Haag