Impeller is complex in shape and suitable for casting.

Wing blades have good aerodynamic characteristics, high efficiency, good strength and high stiffness. Its disadvantage is that the manufacturing process is complex, and the blades are easy to wear when conveying gas with high dust concentration. After the blade is worn, impurities enter the blade, which makes the impeller out of balance and produces vibration. The straight blade is simple to manufacture, but its flow characteristics are poor. Compared with airfoil blades, the efficiency of flat-curved backward blades is lower near the highest efficiency point, and the efficiency of other working points is quite close.