Piezoelectric pump driven by piezoelectric composite beam with adjustable resonant frequency

A piezoelectric compound, resonant frequency technology, applied to pumps with flexible working elements, piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, etc., can solve piezoelectric actuators and one-way valves Unable to work at the same time, the resonance frequency of the piezoelectric driver and the check valve are inconsistent, etc., to achieve the effect of high mechanical quality factor, large vibration deformation and simple structure

CN113162462APending Publication Date: 2021-07-23HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-07-23

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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.
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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...

Examples

Embodiment 1

[0038] see figure 1 , a piezoelectric pump driven by a piezoelectric composite beam with adjustable resonant frequency includes a driving mechanism and a diaphragm pump 7, and the diaphragm pump 7 is a laminated diaphragm pump.

[0039] see figure 2 , the drive mechanism includes a piezoelectric composite beam mechanism 1 with adjustable resonant frequency, and the piezoelectric composite beam mechanism 1 includes an elastic straight beam 2 , two pairs of piezoelectric sheets 3 and a pair of mass blocks 5 .

[0040] The material of the elastic straight beam 2 is metal material, and the surface of the elastic straight beam 2 except the piezoelectric sheet 3 is coated with insulating varnish. The elastic straight beam 2 has a width of 15 mm, a thickness of 0.5 mm, and a length of 40 mm.

[0041] A pair of piezoelectric sheets 3 are fixed and pasted on the upper and lower surfaces of the center side of the elastic straight beam 2 through epoxy resin glue to form a first piezoe...