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Oct. 21, 2020
At present, the basic types of customized impellers include flow channel type (single flow channel, double flow channel), blade type (closed type, open type), spiral centrifugal type, and swirl type. The performance structure of various impellers is described in detail as follows. The sewage pump impeller is generally a closed impeller.
The runner type impeller is a curved flow path from the inlet to the outlet. This type of impeller is suitable for transporting liquids containing large particles of impurities or long fibers. Because this type of impeller has the excellent anti-clogging performance. But his disadvantage is that the anti-cavitation performance is weaker than other forms.
The semi-open and open impellers of the blade impeller are convenient for casting and easy to maintain and clean up the impurities that are blocked during the conveying process. However, its drawback is that the gap between the inner wall of the pressurized water chamber and the blades is enlarged during the abrasion of the solid particles during transportation, which reduces the operating efficiency of the pump, and the increase in the gap makes the stability of the liquid flow in the flow channel damaged. , Make the pump vibrate, this type of impeller is not easy to transport medium containing large particles and long fibers. The closed impeller has high operating efficiency and can run smoothly for a long time. The axial thrust of the pump is small, but the closed impeller is easy to be entangled and is not easy to transport sewage media containing large particles or long fibers.
Sewage pump Impeller
Spiral centrifugal impeller
The spiral centrifugal impeller has twisted blades and extends axially from the suction port on the conical hub body. The conveyed liquid will not hit any part of the pump when it flows through the blades, so there is no damage to the pump, and it is not destructive to the conveyed liquid. Due to the propulsion of the screw, the suspended particles can pass through, so this type is adopted. The impeller pump is suitable for pumping media containing large particles and long fibers.
The swirling impeller is that all or part of the impeller is retracted to the flow channel of the pressurized water chamber, which has a good anti-blocking performance. The particles flowing in the water pressure chamber are driven by the vortex generated by the rotation of the impeller. The movement of the suspended particles does not generate energy and the flow channel exchanges energy with the liquid. In the flow process, suspended particles or long fibers do not contact the worn blades, and the blades are more abraded. There is no increase in the gap due to abrasion. It is suitable for pumping media containing large particles and long fibers.
In summary, no matter any series of sewage pumps are just a combination of different types of cast iron impellers and different types of pressurized water chambers according to the requirements of the conveying medium and installation, as long as the impeller and pressurized water chamber can be optimized Configuration. The various performances of the pump will be guaranteed.