Study on the small double rotation screw pump

Centrifugal pumps designed for operation in low flow rate have various application such as medical, food processing, chemicals, and manufacturing. However, the efficiency of the low flow rate pump is lower than the industrial pumps in general. Therefore, a double rotation screw pump that was different from the centrifugal one was developed to improve the pump performance. The stator of this pump passively rotates in the same direction along with the rotation of the rotor. Thus, because the rotational mechanism is simple, this pump is smaller than a general screw pump. In this report, the dependence of pump performance on number of stator stages and their material is investigated. We obtained the following results; the number of the stator stages improved pump pressure and efficiency and the pump efficiency of ABS resin stator was higher than those of titanium stator.