Differential velocity vane pump driven by rotating guide-bar-gear mechanism

The rotating guide-bar mechanism has the characteristic of transforming the uniform rotation of the crank to the nonuniform rotation of the guide-bar. Thus, two rotating guide-bar mechanisms and gears mechanisms can be combined to form a driving system of the differential velocity vane pump. The driving system makes two coaxial impellers fixed inside the hull rotate with periodical nonuniform velocity, and the neighboring vanes of the two impellers will open and close periodically, so the volume of the compartments vary, which makes liquid flow in and out. c, the ratio of the distance between the rotating centers of the crank and the guide-bar to the length of the crank, affects the performance of the pump and is a pivotal parameter. The larger c is, the higher the flow of the pump. However, as c increases, the fluctuations of both the flow and resisting torque on the driving shaft are greater, and the performance lowers. In the real design, the feasible value of c is 0.3-0.5.