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Rotary piezoelectric generator

A piezoelectric power generation and rotary technology, which is applied to generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, etc., can solve the problems of low conversion efficiency of piezoelectric energy harvesting devices, etc. Achieve the effect of improving energy collection efficiency, high energy collection efficiency, and increasing excitation frequency

Inactive Publication Date: 2014-10-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of low conversion efficiency of the existing piezoelectric energy harvesting device based on low-frequency vibration, and proposes a high-efficiency rotary piezoelectric power generation device

Method used

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  • Rotary piezoelectric generator
  • Rotary piezoelectric generator
  • Rotary piezoelectric generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] combine figure 1 Describing the present embodiment, the present embodiment includes a plurality of blades 1, a shaft 2, a plurality of piezoelectric resonators 4, and a circular casing 3, and the plurality of blades 1, the shaft 2, and the plurality of piezoelectric resonators 4 are mounted on the circular casing The interior of 3 is characterized in that: a plurality of blades 1 are rigidly connected to the shaft 2 along the circumference of the shaft 2, and a plurality of piezoelectric resonators 4 are rigidly connected to the inner wall of the circular casing 3 along the circumference of the inner wall of the casing 3. It is coaxial with the casing 3; during the relative movement of the blade 1 and the circular casing 3, the rotating blade 1 strikes the piezoelectric resonator 4 several times to make it vibrate and deform at its natural frequency, so as to make the piezoelectric resonator 4 vibrate and deform. Shock loads acting on it are converted into electrical en...

Embodiment 2

[0023] combine figure 2 As shown, the piezoelectric resonator 4 includes an indenter 5, a peripheral sleeve 6, a mass 7, a piezoelectric stack 8, a spring 9 and a cable 10. The indenter 5 is located at the top of the peripheral sleeve 6 and is connected to the top of the peripheral sleeve 6. The hole wall has no frictional contact, the lower end of the indenter 5 passes through the top of the peripheral sleeve 6 and is connected to the mass block 7 inside the peripheral sleeve 6, the mass block 7 is connected to the piezoelectric stack 8, and one end of the spring 9 is fixed to the piezoelectric stack 8. At the bottom end, the other end of the spring 9 is fixed to the bottom end of the peripheral sleeve 6; the upper and lower end surfaces of the piezoelectric stack 8 are electrically connected to the two terminals of the cable 10 respectively, and the connection is insulated and protected by epoxy resin; Each terminal is electrically connected to the external circuit through ...

Embodiment 3

[0030] combine Figure 4 Illustrating the composition of the piezoelectric stack structure, the piezoelectric sheets 11 and the electrodes 12 are alternately arranged to form the piezoelectric stack 8, wherein the polarization directions of the two adjacent piezoelectric sheets are opposite, so that the piezoelectric sheets 11 are mechanically connected in series. Electrically, it is a parallel structure, so that the generated voltage value is low, which is convenient for management in the circuit.

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Abstract

The invention relates to a rotary piezoelectric power generator which comprises a plurality of blades 1, a shaft 2, a plurality of piezoresonators 4 and a circular shell 3, wherein the blades 1, the shaft 2 and the piezoresonators 4 are installed inside the circular shell 3; the blades 1 are rigidly connected with the shaft 2 into an integral body along the circumference of the shaft 2; the piezoresonators 4 are rigidly connected with the inner wall of the circular shell 3 along the circumference of the inner wall of the shell 3; the shaft 2 and the shell 3 are coaxial; and while the blades 1 and the circular shell 3 generate a relative movement, the blades 1 generate pulse-type excitation onto the piezoresonators 4, thereby generating electric power in the impact and damped vibration process of the piezoresonators 4. The excitation is applied to the resonators through the rotating blades in the form of a pulse-type impact load to obtain high initial instantaneous power; and by the aid of the interval excitation of the rotating blades, the excitation frequency of the resonators can be multiplied as compared with the original external excitation frequency, so the excitation frequency of the piezoresonators is greatly enhanced, and the energy collection efficiency is high.

Description

technical field [0001] The invention relates to an energy collection device, in particular to a rotary piezoelectric generator. Background technique [0002] Due to the excessive use of fossil energy on the earth, resulting in many problems such as energy shortage, climate change and greenhouse effect, countries have begun to look for non-polluting alternative energy sources, such as solar energy, hydropower, geothermal energy, wind energy, tidal energy, ocean temperature difference and mechanical vibration energy. Because vibration energy is not affected by weather factors and seasons, it is very common in the living environment, and can be converted into electrical energy with an appropriate extraction device. It has become a new energy harvesting research hotspot. There are three main forms of vibration energy harvesting: electromagnetic, electrostatic and piezoelectric. Compared with the first two conversion devices, the piezoelectric power generation device has the adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/18
Inventor 关新春黄永虎李惠欧进萍
Owner HARBIN INST OF TECH