Compared to centrifugal pumps
The delivery flow of rotor pumps can be controlled more precisely. The output flow rate of centrifugal pumps cannot be precisely controlled and decreases with the increase of resistance. The rotor pump has a strong self-priming capability, while the centrifugal pump must be filled with liquid before it can be rotated.
Centrifugal pumps decrease in flow and increase in power as viscosity increases; while for rotor pumps, on the one hand, as viscosity increases, internal leakage decreases, volumetric efficiency increases, and flow increases, resulting in higher pump efficiency and lower power, on the other hand, the increase in viscosity increases the frictional resistance of the liquid, which correspondingly decreases pump efficiency and slightly increases power consumption, but overall, conveying larger On the other hand, the increase in viscosity increases the frictional resistance of the liquid, which in turn reduces the efficiency of the pump and slightly increases the power consumption.
The rotor pump speed is generally low, generally between 200r/min and 400r/min, the material being conveyed is smoothly output without damage to its composition; while the centrifugal pump has the best efficiency at a specific speed, and the material being conveyed is subject to strong impact and centrifugal force, so the centrifugal pump in the transport of mixtures often produce the phenomenon of inconsistent composition of the material The quality of the finished product is reduced. Rotor pump is the best choice to solve this problem, so it is particularly suitable for conveying mixed materials and even materials containing solid particles, rotor pump pump can be used to transport very high viscosity material. And centrifugal pumps do not have this feature. Rotor pumps can be easily made into varieties with higher output pressure, suitable for long distance or high resistance quantitative transfer.
Comparison with screw pumps
They are both volumetric pumps, so their performance is basically similar. It can steadily convey high-viscosity substances and has a high conveying pressure. But the screw pump has one of the biggest drawbacks to determine its unsuitability: by the non-streamlined surface of the screw pump, numerous defects in the chamber, direct contact between the screw and the bushing determines the short life of its use, the rotor pump between the rotor and the pump casing there is a gap between the rotor and the rotor and the pump casing, the streamlined structure of the rotor and the rotor chamber in the basic absence of dead spots and non-metallic parts, for high viscosity media easier to convey, with a longer Longer service life.