The modelling of movement of mechanical impurities during flow in pump and 1st separation in a pump separator of impurities

The paper deals with the results of investigations concerning the design of a pump separator of mechanical impurities contained in the pumped liquid. A mathematical model of the movement of solid bodies has been developed, which leave the centrifugal pump together with the liquid. The applied method of calculations makes it possible to determine the path and parameters of the moving solid. Assuming the given shape of the discharge channel, the results of calculations have been analysed. Test-stand investigations were carried out on a multi-stage centrifugal pump, in which a separator of mechanical impurities had been installed. The impurities, which were precipitated in the pump, were removed from the casing of the pump through a sink. It has been found the relation of degree of purification to volume fraction of the liquid discharged through the sink. Such investigations have been run at various deliveries of the pump.