1) The closed blade impeller designed according to the clear water pump has the highest efficiency, but because of the large number of blades, the blade is distorted, and the impeller exit width is narrow, so it is easy to produce winding and clogging when pumping sewage dirt, And it is prone to overload, it is generally not in engineering practice.
2) According to the design of the sewage pump closed impeller blade number is relatively small, generally 2-3, the impeller exit width is larger.The blade is cylindrical, and the blade head column diameter larger. Thicker, and thus has a certain anti-winding, anti-clogging performance, in a long period of time before the often used for various types of sewage pump impeller, but the efficiency is relatively low and there is danger of overload.
3) The width of the double channel impeller is larger than the maximum value of the maximum diameter of the solid particle in the standard.It is two curved flow passages from the inlet to the outlet, so it is anti-entangling and non-clogging. .
4) The efficiency of the dual-channel impeller is high, and the efficiency of the rated working point pump is 13.04% higher than the specified value of CJ / T3038-1995 standard.
5) The power curve of the dual-channel impeller is relatively flat, and the maximum shaft power is far less than the rated power in the whole head range from zero head to the dead head without overload performance and safe operation in the whole lift range.
6) As the flow channel impeller has obvious advantages, so the use of flow-type impeller instead of the usual sewage pump design used in the closed blade impeller is a development trend. In addition, from the anti-winding, non-clogging performance, through the ability, efficiency, process, economy, reliability, advanced integrated analysis and comparison of flow impeller is also better than several other impeller structure type, which has A strong promotion and application value.
