Low-frequency multidirectional vibration energy recovery device

Abstract

The invention discloses a low-frequency multidirectional vibration energy recovery device, which comprises a mass block and an outer frame, wherein the mass block is positioned in the outer frame; the mass block is connected with the outer frame by foldable elastic beams; each foldable elastic beam is provided with a piezoelectric sheet; the periphery of the mass block is provided with the foldable elastic beams with the same folding mode; and the folding mode of the foldable elastic beams is characterized by folding by layers from outside to inside and decreasing the folding length progressively. The device can be used for low-frequency vibration energy recovery in various large machine engine bases or vibration elements, automobile engines, blenders, washing machines and various micro-structures, and can provide electric power for various types of portable equipment, wireless sensors and micro electro mechanical systems.

Description

technical field [0001] The invention belongs to the technical field of resonance energy recovery devices, and relates to a low-frequency multi-directional vibration energy recovery device. Background technique [0002] Energy recovery refers to the process of obtaining external energy and converting it into usable electrical energy. In the past decade, with the rapid development of portable devices, wireless sensors, and microelectromechanical systems (MEMS), materials and structures with energy recovery capabilities have received extensive attention and research. For these devices that need to be self-powered, energy recovery from the vibration of the surrounding environment is undoubtedly the most convenient and potential way. At present, countries such as the United States, Japan, the Netherlands, and the United Kingdom have begun research on clean, reliable, and cheap micro-energy devices, and have begun to develop micro-energy devices based on piezoelectric principles ...

AI Technical Summary

Problems solved by technology

But there are three big disadvantages: first, the structure is huge. If the resonant frequency of such a structure is to reach the low frequency stage of 50-250 Hz, one cycle of the structure needs to reach more than 0.7 meters, which is far from practical application; Single frequency, for the determined phononic crystal structure, the introduced defects can only resonate at a single frequency to form a resonant cavity; the third is the design difficulty, for resonance at one frequency, it is necessary to design a piezoelectric sheet with the same resonant frequency match it

The disadvantage of this device is that the piezoelectric material is difficult to implant into the soft rubber coating, and even if a new type of piezoelectric material is used as the coating, the efficiency of energy recovery is very low due to the limitation of the vibration amount in the solid

[0012] To sum up, for the recovery of low-frequency vibration energy distributed in the 50-250Hz frequency band in the environment, the existing recovery devices either cannot meet the low-frequency requirements of environmental vibration energy recovery; or can meet the low-frequency requirements but have a large structure that is not conducive to the device or the device is only effective for a single frequency or a narrow frequency band; or it does not have a multi-directional recovery function; or there is a certain degree of difficulty in design, or the recovery efficiency is low

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