Sewage pump belongs to the scope of centrifugal pump. Its structure and principle are the same as that of general centrifugal pump. Sewage pump also has its own structural characteristics, the head of the sewage pump is not high, because there are more impurities in the sewage, the clearance of impeller is larger than that of clean water pump. Sewage pump is prone to failure, and the general centrifugal pump is similar, because the sewage pumping, so the impeller wear faster.
Pipeline water pump is designed to achieve the highest efficiency, that is to say, the hydraulic structure parameters of the water pump is the best combination to achieve the highest efficiency. The efficiencies of sewage pumps and pumps with special requirements can not exceed the efficiencies of clean water pumps in the same period.
The main reason why sewage pumps are less efficient than clean water pumps is that their passages are widened. The decrease of efficiency is mainly related to the extent of broadening. The sewage pump runner is widened to prevent blockage.
The impeller of the sewage pump is simpler than that of the clean water pump and has no guard ring, so it will not be used as dirt grass. There is also a saw-tooth blade under the impeller, which can be adjusted up and down to grind the thread head and cloth pieces and pull them out.