Design, Analysis, and Fabrication of a Differential Pump Driven by Whitworth Mechanisms

摘要

A new differential pump is presented in this paper. A pump of this type is mainly composed of a motor, two trains of gearings, two speed-transforming mechanisms of the same type and a pump body. The pump body is composed of two impellers and a pump case. The operating principle is: the motor indirectly drives two speed transforming mechanisms, which in turn drive their corresponding impellers separately but cooperatively, so that the volumes of the four compartments separated by the two impellers vary periodically. Consequently liquid can be drawn in and discharged through two inlets and two outlets of the pump case, respectively. The function of the speed transforming mechanism is to transform uniform rotation into nonuniform rotation. Whitworth mechanisms are used as the speed transforming mechanisms. The operation principle is presented, the kinematics is analyzed, and the performance indexes are discussed. Finally, the experimental result is described.