Abstract
Screw centrifugal pumps are of non-clog type and they are used to transport slurries, rainwater and sewage as well as solids. The impeller has a three-dimensional spiral blade. The pump combines the characteristics of both positive displacement pump by screw action in suction cover and a centrifugal pump by centrifugal action in volute casing. The radial thrust of the impeller was measured and the followings were proved ; (1) The time-averaged component of the radial thrust is much influenced by pressure distribution in volute casing, so that the three-dimensional effect of screw part is small. (2) The time-varying component is caused by the peripheral unbalance of the blade area in volute casing. (3) The radial thrust could be estimated easily by measuring the pressure at the surface of volute casing.
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