Piezoelectric pump based on resonance differential displacement amplification

Abstract

The invention discloses a piezoelectric pump based on resonance differential displacement amplification. The pump comprises a shell. The two ends of the shell are sealed through a front end cover anda rear end cover. Fluid flows in from one side of the front end cover and flows out from one side of the rear end cover. In a space defined by the shell and the two end covers, a first piezoelectric actuator, a piston, a spring and a piston cylinder form a first spring mass damping system, and the first spring mass damping system is forced to generate resonance under driving of the first piezoelectric actuator. A second piezoelectric actuator, an energy converter, the piston cylinder and the piston form a second spring mass damping system, the energy converter is forced to generate resonance under the driving of the second piezoelectric actuator, and the energy converter drives the piston cylinder embedded in the energy converter to do reciprocating motion. The driving voltage frequency ofthe first piezoelectric actuator and the driving voltage frequency of the second piezoelectric actuator are consistent, the driving voltage phase difference is zero, the vibration frequency of the piston and the vibration frequency of the piston cylinder are consistent, and resonance differential displacement amplification is generated. The pump is compact in structure, suitable for high-frequency working occasions, high in output pressure, large in flow and low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric pumps, in particular to a piezoelectric pump based on resonance differential displacement amplification. Background technique [0002] With the rapid development of piezoelectric smart materials, piezoelectric pumps, as key components in the fluid delivery process, have attracted increasing attention since the 1970s. The piezoelectric pump is a new type of fluid pump that uses the inverse piezoelectric effect of piezoelectric ceramics to deform the piezoelectric vibrator, and then the volume change of the pump chamber is generated by the deformation to achieve fluid output. Because the piezoelectric pump has no motor and no rotating parts in the working process, and only uses piezoelectric ceramics as its power drive source, it has the advantages of small size, simple structure, high efficiency, convenient control, no electromagnetic interference, and low energy consumption. , has been more...

AI Technical Summary

Problems solved by technology

However, due to the small deformation of a single piezoelectric ceramic piece, and the ordinary check valve will lag behind when the piezoelectric pump is working at high frequency, and cannot be completely closed to generate backflow. The flow bottleneck problem has been unable to meet the occasions that require fast response, large flow, high precision and high pressure

Images