A spiral-tube-type valveless piezoelectric pump with gyroscopic effect

The valveless piezoelectric pump integrates driving and transmitting into one operating element, and characterizes easy micro-miniaturization. But, there is the original sin of low pressure and low flow. Thus, it must avoid weakness to choose applications field. This paper analyzes the flow characteristics in the rotary spiral-tube, which will cause the Coriolis force, and subsequently influence the fluid moving. The principle of the pump is deduced, and the spiral-tube-type valveless piezoelectric pump is invented. The angular velocity variation can be obtained when the pump attitude changes, which theoretically verifies the gyroscopic effect of the pump. A pump is fabricated for experimental testing. Experiments has shown that when Archimedes spiral $ \theta = 4\uppi $ is selected for the tube design, and the rotation speed of the plate is 70 r/min, the pressure differential is 9 mm H₂O, which is 1.5 times that of 0 r/min rotation speed. If introduced the low-cost and miniaturized gyroscope, then this may promise potential application in these areas such as smart cars, robots, and home health care.