Slurry design law should be noted that similar problems In a similar design , in addition to the above steps should be calculated , you must also pay attention to some of the following questions:
1 question about the performance and efficiency In the introduction of similar design method, we are in the model and real pump efficiency pump under conditions equivalent conversion . In fact, similar to zoom in or out after the pump efficiency is not exactly equal , if the real model pump pump than large ( ie, similar to the zoom ) , the real test of the actual pump head and efficiency is somewhat larger than the calculated value ; If the real smaller than the model pump pump ( ie, similar to the reduction ) , then the real test of the actual pump head and efficiency is slightly smaller than the calculated value , real difference between pump and pump size the bigger model , head and efficiency difference between the calculated and experimental values was also greater. Therefore, in the choice of model pump, select the size difference should be as large Debu pump , Figure 5-1 by 3BA-9 amplified to 8Sh-9 ‘s head and efficiency curves of Figure 5-2 by 14Sh-13 reduced to 8Sh-13 ‘s head and efficiency curves . The figure shows that the performance of a similar law of conversion curve and the performance curve of the actual test out there is a difference .
The main reason for this phenomenon are: enlarged various losses similar proportion of relatively reduced, so the actual efficiency and head representing the calculated value ; slurry pump manufacturer similar to shrink, the relative increase in the proportion of various types of losses , so the actual efficiency and lift smaller than the calculated value . The size difference only under specific circumstances , be corrected by experience . Recommends the following empirical formula to correct the enlargement or reduction factor .
Post time: Jul-13-2021