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US 5,348,444 AGranted
Single-blade impeller for centrifugal pumps
AssigneeKSB Aktiengesellschaft
InventorsWolfgang Metzinger, Rolf Witzel
Life of this patent
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AssigneeKSB Aktiengesellschaft
InventorsWolfgang Metzinger, Rolf Witzel
Estimating the term…
A centrifugal pump for conveying fluids with suspended solids has a single-blade impeller. The blade angle, as measured at the meridian line of the blade, is positive at the rear end of the blade and less than 0 degrees along a portion of the blade which extends from the front end towards the rear end of the blade through an angle of at least 90 degrees. The inner side of the blade defines a segment of a circle which is coextensive with this portion of the blade. The front end of the blade has a surface which bridges the inner and outer sides of the blade, and such surface is either flat or forms an arc having a radius of curvature substantially greater than half the blade thickness.
An impeller, particularly for use in a centrifugal pump designed to convey solids-containing fluids, comprising a rotational axis, an arcuate guiding blade for fluid which rotates about said rotational axis, said blade having a front cover plate, a rear cover plate, a suction side, and a pressure side which define a channel having an intake and an outlet, said channel having a cross-sectional area that decreases from said intake to said outlet, and said blade further having a median line, and a blade angle, as measured at said median line, which is positive adjacent to said outlet and is less than 0 degrees adjacent to said inlet.
Dependencies are inferred from the claim text.