As the study of the theory of continuous improvement and test conclusion deepening and accumulation, especially the application of the theory of two-phase flow, sewage pump, slurry pump efficiency and constantly improve the level of inevitable.
1. Ordinary water pump is designed to obtain the highest efficiency, that is to say, the hydraulic structure of the water pump is the best combination of the highest efficiency. The water pump efficiency of sewage pump, slurry pump of this kind of special requirements of the pump efficiency can not be more than the same period. This comparison refers to the advanced level of the same time rather than the design level of a person.
2. Sewage pump, slurry pump clean water pump is lower than the efficiency of the main reason is that they have widened the channel flow. The value of the efficiency decrease is mainly related to the extent of the broadening. So, if there is no capacity constraints, for two different sewage pumps, slurry pump (Q, H, n) for the efficiency of comparison is meaningless.
3. Sewage pump flow is widened to prevent the obstruction, so the efficiency of the original sewage pump is usually lower than the secondary sewage pump.
According to the statistical results of the sewage pump efficiency of 0.8 and Q<600m³/h of the /DS=0.6 to give, under this condition the efficiency formula of [1]>
=0.78- (6.74Q) -0.32-0.29 (0.32-lg0.013ns) 2 - Q - flow, m³/h.
Phi - pump allows the size of mm.
4. The widening of the slurry pump is mainly to reduce the flow velocity of the two phase flow in the runner to reduce the wear and tear. So, the efficiency of strong abrasive slurry is usually lower than the efficiency of mud pump. Such as Zigong industrial pump production of Limited by Share Ltd NG, ND type pump is used to strong abrasion of the slurry, NQ type pump is used for pumping light mud.
5. Suggestions on efficiency given the sewage pump, slurry pump, and is given through the smallest size, to facilitate the comparison to the level of pump design.
Recommended the establishment of ETA =f test (Q, NS, phi) between sewage pump, slurry pump.
