EFFECTS OF MANUFACTURING DEVIATION ON THE PRESSURE PULSATION OF THREE SCREW PUMPS
Keywords:screw pump, pulsation, manufacturing deviation, RALA
When both, a low operating pressure and an extremely low pulsation is required screw pumps can be better than other machines. Due to their low pulsation, low noise level, good suction ability and high reliability, screw pumps are often the best solution. It is shown in this paper that pumps can vary in pressure pulsation very much depending on manufacturing deviations. Therefore this paper deals with a simulation model, which was verified by experimental tests. Then the calculated pressure pulsation according to cylindrical, conical and eccentric deviation in dimension of the manufactured parts from the design is presented. Precisely, each difference in pulsation characteristic can be explained with manufacturing deviations. Three screw pumps are very sensitive to eccentricity and pressure pulsation can be reduced by using the optimal length of the drive spindle. Additionally, the positive impact of a conical spindle is shown.
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