With the rapid development of rotor pump technology, there are more and more types and better performance. From single-vane to multi-vane, from straight vane to twisted vane. According to the number of impeller vanes can be divided into single-lobe rotor pump, two-lobe rotor pump, three-lobe rotor pump and four-lobe rotor pump. But as the number of vanes increases, the worse the performance of its transport medium, especially the foamy mass containing gas with particles of multi-clock liquid and larger viscous medium; fewer vanes, lower crushing of particles in the medium and larger pulsation.
Two lobe rotors are straight, and three lobe have straight and twisted lobe, of which twisted lobe rotor pump can effectively improve the unevenness of the fluid transport.
At present, domestic and foreign research on rotor pumps mainly focuses on the following aspects: the design of the rotor end profile rotor pump is a volumetric pump, the rotor is the core component of the pump, its good or bad directly affects the efficiency and performance of the rotor pump. At present, scholars at home and abroad on the rotor shape of the rotor pump research more and more. The design of the rotor is mainly the design of the rotor cross-sectional profile. Commonly used rotor pump section lines are involute, cycloid and circular arc. The involute rotor cavity has a high volume utilization factor and is used more often in blower rotors and also in lobe pumps.
Twisted lobe rotor pumps have been increasingly researched in recent years due to their better performance than straight lobe. Twisted lobe rotors are low-noise structural designs with much less pulsation than straight lobe and are now very widely used.