At present, the basic types of pump impeller are runner type (single runner, double runner), vane type (closed, open), spiral centrifugal type, rotary flow four. The performance structure of various impeller is described in detail as follows. Centrifugal pump impeller is generally a closed impeller.

1. Runner impeller:

Channel impeller is a curved channel from the inlet to the outlet. This type of impeller is suitable for conveying liquids containing large particles of impurities or long fibers. Because this type of impeller has excellent anti - clogging performance. But its disadvantage is that the cavitation resistance is weaker than other forms.

2. Blade impeller:

The semi-open impeller and the open impeller in the blade impeller are easy to cast, and easy to maintain and clean up the impurities blocked in the conveying process. But his malpractice lies in the solid particles in the process of transportation between the water bearing abrasion on interior wall and blade clearance increased, decreased the efficiency of the pump, and because of the increase of clearance has resulted in a liquid flow channel the flow of the stability of the damage, make the pump produces vibration, this type of impeller is not easy to transport with large particles medium and long fibers. The enclosed impeller has high operation efficiency and can run smoothly for a long time. The axial thrust of the pump is small, but the enclosed impeller is easy to be wound and is not easy to transport sewage media containing large particles or long fibers.

3. Spiral centrifugal impeller:

The spiral centrifugal impeller is a twisted blade, which extends axially from the suction inlet on the cone hub body. When the conveying liquid flows through the blade, it will not hit any part of the pump, so there is no damage to the pump, and there is no damage to the conveying liquid due to the propelling effect of the screw, the passing of suspended particles is strong, so the pump using this type of impeller is suitable for pumping medium containing large particles and long fibers.

4. Swirling impeller:

The impeller of swirling flow is all or part of the impeller is shrunk to the passage of the pressurized chamber, which has good anti-blocking performance. The particles flow in the water pressure room under the promotion of the eddy current generated by the impeller rotation, suspended particle movement itself does not generate energy, flow channel and liquid exchange energy. In the process of flow, suspended particles or long fibers do not contact with the worn blade, the case of more wear of the blade is light, there is no gap due to abrasion and increase, suitable for pumping medium containing large particles and long fibers.