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Piezoelectric type energy harvester

An energy harvester, piezoelectric technology, applied in the field of mechanical vibration energy recovery device, to achieve the effect of easy replacement, improve piezoelectric conversion efficiency, and reduce pulsation rate

Inactive Publication Date: 2015-04-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no device in the prior art that utilizes piezoelectric energy harvesters to recover the vibration energy of diesel engines

Method used

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Such as Figure 1~5 As shown, the improved piezoelectric energy harvester of the present invention includes a barrel-shaped base 4 for accommodating the piezoelectric energy harvester 3 and fixing it on the base 2 of the diesel engine 1 . The barrel-shaped base 4 is provided with a piezoelectric unit 5, the piezoelectric unit 5 includes an annular shell 6, three stages 7 are evenly arranged on the inner surface of the annular shell 6, and the supporting surface 8 of each stage 7 on the same level. Each stage 7 is respectively provided with a piezoelectric ceramic stack 9 and a limit baffle 15 for limiting the position of the piezoelectric ceramic stack 9. The limit baffle 15 surrounds the periphery of the piezoelectric ceramic stack 9, and its inner surface is tight. Paste the side of piezoelectric ceramic stack 9. The piezo...

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Abstract

The invention discloses a piezoelectric type energy harvester used for recycling the vibration energy of a diesel engine. The piezoelectric type energy harvester comprises a barrel pedestal, wherein piezoelectric units are arranged on the barrel pedestal; each piezoelectric unit comprises an annular outer casing; three or five objective tables are uniformly arranged at equal angles on the inner side face of each annular outer casing; a piezoelectric ceramic stack and a limiting baffle plate are arranged on each of the objective tables; the piezoelectric ceramic stacks are respectively of a layered structure formed by stacking piezoelectric ceramic wafers; glands are respectively arranged above the piezoelectric ceramic stacks; the top parts of the glands are respectively provided with a support rod; cantilever beams are respectively arranged above the support rods; the cantilever beams are respectively connected with mass blocks at the centres of the annular outer casings. According to the piezoelectric type energy harvester, the direct piezoelectric effect of piezoelectric ceramic is utilized; as a cantilever beam structure is adopted to harvest the vibration energy of the diesel engine, the harmful vibration is changed into usable electric energy; therefore low-energy-consumption electric appliances on a ship can be supplied with power, and the consumption of fossil fuel is reduced.

Description

technical field [0001] The invention relates to a mechanical vibration energy recovery device, in particular to a piezoelectric energy harvester. Background technique [0002] As early as the late 19th century, the problem of ship vibration has attracted people's attention. Diesel engines are the models with the highest thermal efficiency, the highest energy utilization rate, and the most energy-saving models in power machinery. They are widely used in the ship industry. Since diesel engines use crank connecting rods The mechanism, with the high-speed operation of the diesel engine, will inevitably produce periodically changing unbalanced forces and moments, and vibration will also be generated, and the long-term vibration energy will be directly dissipated into the air. [0003] There are generally three methods used to convert mechanical vibration into electrical energy: electromagnetic, electrostatic, and piezoelectric. Piezoelectric energy harvesters have attracted much...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/18
Inventor 杨琨胡迪尚冉刘丹谢良涛饶响
Owner WUHAN UNIV OF TECH
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