Piezoelectric pump driven by piezoelectric composite beam with adjustable resonant frequency

Abstract

The invention relates to a piezoelectric pump driven by a piezoelectric composite beam with an adjustable resonant frequency, and belongs to the technical field of piezoelectric pumps. The piezoelectric pump comprises a driving mechanism and a single diaphragm pump; the driving mechanism comprises a piezoelectric composite beam mechanism with the adjustable resonant frequency; the piezoelectric composite beam mechanism comprises an elastic straight beam, two pairs of piezoelectric patches and a pair of mass blocks; one pair of piezoelectric patches are arranged on the upper and lower surfaces of the left side of the center of the elastic straight beam, and the other pair of piezoelectric patches are arranged on the upper and lower surfaces of the right side of the center of the elastic straight beam to form a piezoelectric bimorph structure and are symmetrically positioned on the elastic straight beam; all the piezoelectric patches are connected in series or in parallel through wires; and the diaphragm pump is fixedly connected to a central mounting hole of the elastic straight beam through a bolt. According to the piezoelectric pump, the resonant frequency of the piezoelectric composite beam mechanism can be adjusted by changing the size of the mass blocks so that the resonant frequency can be matched with the optimal working frequency of the one-way valve, both the piezoelectric composite beam mechanism and the one-way valve are ensured to work in the optimal state, and therefore the output performance and the working efficiency of the piezoelectric pump are improved.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric pumps, in particular to a piezoelectric pump driven by piezoelectric composite beams with adjustable resonant frequency. Background technique [0002] Piezoelectric pump is a new type of fluid transmission device with piezoelectric vibrator as the power element. It is the most typical type of precision fluid pump. It uses the inverse piezoelectric effect of piezoelectric elements to convert electrical energy into mechanical energy, so that Deformation is generated to drive the volume of the pump chamber to change, or the piezoelectric vibrator is used to generate fluctuations to drive the directional flow of the fluid. The piezoelectric pump integrates the driver, the pump chamber and the one-way valve, which not only overcomes the leakage and friction and wear between the relative moving parts in the traditional pump, but also reduces the energy loss between different parts. Since piezoele...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the piezoelectric driver and the check valve cannot work at the optimal operating frequency at the same time due to the inconsistency of the resonant frequencies of the piezoelectric driver and the check valve in the resonant piezoelectric pump, the present invention provides a pump with resonant frequency adjustable Piezoelectric pumps driven by tuned piezoelectric composite beams

Images