The swirl impeller is all or part of the impeller is retracted to the flow channel of the pressure chamber, and has good anti-clogging performance. The particles flow in the water pressure chamber is driven by the eddy current 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 with the worn blades, and the blades are slightly worn, and there is no increase in clearance due to abrasion, which is suitable for pumping media containing large particles and long fibers.

The semi-open impeller and open impeller in the vane impeller are easy to cast, and easy to maintain and clean the impurities blocked in the transportation process. However, its disadvantage is that the gap between the wall of the pressurized water chamber and the blade increases under the abrasion of solid particles during the transportation process, which reduces the operation efficiency of the pump, and because the increase of the gap destroys the stability of the flow pattern of the liquid in the flow channel, causing the pump to vibrate. This type of impeller is not easy to transport the medium containing large particles and long fibers.