A piezoelectric vibration energy harvester

Abstract

The invention relates to a piezoelectric type vibration energy harvester. The piezoelectric type vibration energy harvester adopts a hollow hexagonal-prism-shaped shell, wherein two layers of beams are arranged on the inner side face of the shell; three beams are distributed in each layer at the equal angle; a piezoelectric patch is arranged on each of the upper surface and the lower surface of each beam separately; a circular table body with a thick upper part and a thin lower part is arranged in the middle of the shell; the bottom end of the circular table body is in threaded connection with the bottom of the hexagonal-prism-shaped shell; and when the circular table body is screwed in the shell at a depth which is equal to half of the length of the screw threads at the bottom of the hexagonal-prism-shaped shell, the beams and the circular table body are just in contact. According to the piezoelectric type vibration energy harvester, the d31 coupling working mode of the piezoelectric patches is utilized; namely, the direction of the acting force is perpendicular to the polarization direction of the piezoelectric patches; the vibration energy of an engine is recycled by the beam structure; the vibration energy is converted into useful electric energy; the piezoelectric type vibration energy harvester has the advantages of relatively wide resonance frequency band and high vibration energy recovery efficiency.

Description

technical field [0001] The invention belongs to the technical field of new energy and power generation, and in particular relates to a piezoelectric vibration energy harvester. Background technique [0002] At present, solving energy shortage and environmental pollution has become the focus of the automobile industry. Energy-saving and emission-reduction technologies have received widespread attention. New energy vehicles have solved the problem of emissions, but energy-saving technologies have not yet made major breakthroughs in the automotive field. [0003] During the driving process of the car, vibration exists in many aspects. The vibration frequency of the engine is several hundred hertz. The vibration energy harvester is used to recover part of the vibration energy and supply it to the micro-electromechanical system, which can reduce energy consumption and environmental pollution. [0004] There are mainly three types of vibration energy recovery: electromagnetic, ele...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a piezoelectric vibration energy harvester, which solves the problem that the vibration energy harvester cannot adjust the resonance frequency band

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