For sewage pump is the most critical problem is the reliability problem, because the use of sewage pump occasions in the liquid; transport medium is some mixed liquid containing solid materials; the close proximity of the pump and motor; pump for the vertical layout, turning parts weight and impeller to withstand water pressure in the same direction. These issues have made the sewage pump in the seal, motor bearing capacity, bearing arrangement and selection and other aspects of the requirements than the general sewage pump to high.
In view of the problem of submersible sewage pump, some domestic manufacturers to focus on the development of pump protection system: automatic alarm or cut off the power supply when the pump running. While this approach can play a certain effect, and this protection is necessary, but this and not to solve the problem of the fundamental methods to put focus on improve the pump's performance and the problem is fundamentally solved.
