1) The double-channel impeller has a steeper drop H-Q curve; and P-Q curve is relatively flat, the slope is small, and in the whole lift range shaft power has a maximum value of 6.29kW, less than the rated power of 7.5kW; Z- The Q curve has a high peak and a high efficiency area. The performance curve of the double-channel impeller submersible sewage pump is shown in Fig.

 

2) According to the clean pump design of the closed blade impeller despite the highest efficiency, but because of the larger number of leaves, leaves twisted, and the impeller outlet width is narrow, so when pumping sewage dirt prone to winding and clogging, or even work, And it is prone to overload, so in engineering practice generally do not.