In order to improve the poor separation performance of a conical hydrocyclone during the startup time of a pump unit,taking the DN50 type hydrocyclone as a model,the experimental investigations into the effects of the pump startup time on the separation performance were carried out using the working liquids with three sand mass fractions by means of the frequency variable control technology.The startup times 5,15,30,90 and 120 s for the liquids with 0.451% sand mass fraction,15,30,60 and 90 s for those with 0.266% and 0.124% fractions were applied,respectively.The experimental results showed that the shorter the start up time,the poorer the separation performance for larger size particles; while the longer the start up time,the poorer the performance for smaller size particles.During the start up period,both the total separation efficiency and the classification performance of hydrocyclone are deteriorated initially,and then get better,eventually reach constant levels.At a certain time instance of the same startup time,the classification performance presents a regular wavy variation with increasing size of particles.The particles larger than 0.2 mm in size achieve the best classification performance.It is recommended that the optimal start up time is 30 s when the pump works with the hydrocyclone at the flow rate of 15 m /h.
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