CN114285323A

CN114285323A - Vibration energy collector device

Info

Publication number: CN114285323A
Application number: CN202111653129.9A
Authority: CN
Inventors: 王海; 孙航; 杨春来; 张子豪; 徐罡; 许建洲
Original assignee: Anhui Polytechnic University
Current assignee: Anhui Polytechnic University
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-04-05

Abstract

The invention provides a vibration energy collector device, which comprises a main body (1), wherein a cantilever (2) is arranged on the main body (1), and the vibration energy collector device is characterized in that: the cantilever structure is characterized in that a groove body (3) is arranged at one end of the cantilever (2), a piezoelectric sheet (4) is arranged on the cantilever (2), a texture layer (5) is arranged on the outer peripheral surface of the main body (1), and a lead is arranged on the piezoelectric sheet (4). The invention has simple structure and convenient use, effectively improves the pneumatic performance of the system, further improves the energy acquisition efficiency and improves the response capability of the system in a low-frequency state.

Description

Vibration energy collector device

The technical field is as follows:

the invention relates to the field of energy collection, in particular to a vibration energy collector device.

Background art:

with the advance of sustainable development and green development and the large-scale application of wireless sensor networks in production life, the collection of wind energy to power wireless sensor nodes or low-power devices is gradually receiving attention. When fluid reaching a certain flow velocity is affected by turbulent fluid, a karman vortex street phenomenon can be generated, the vortex street periodically falls off along with the increase of the flow velocity, and at the moment, if the vortex street which falls off by fixing the cantilever beam behind the turbulent fluid, the cantilever beam can be hit to excite the cantilever beam to generate vibration. The piezoelectric sheet is adhered to the cantilever beam, so that the vibration energy can be converted into electric energy to achieve the effect of collecting wind energy. The wind energy is collected through the flow-induced vibration, and the wind energy collecting device has the advantages of cleanness, high energy conversion efficiency, high voltage, high output power and the like.

The conventional flow induced vibration energy collection mainly has the following problems that firstly, a common blunt body with a smooth surface is adopted in the conventional flow induced vibration energy collector, the critical wind speed is high, the pneumatic performance is not ideal, secondly, a common cantilever beam is used as a vibrator, and the characteristic frequency is high, so that the low-frequency energy is not favorably collected. The wind speed existing in nature is not always high, and the wind energy with low frequency and low wind speed (below 10 m/s) is ubiquitous. The common energy collector has low energy collecting efficiency in low wind speed and low frequency states, and cannot well utilize low wind speed wind energy and low frequency energy widely existing in the nature. Finally, most of the existing turbulent fluids are solid turbulent fluids, the beam strength requirement is relatively high due to the large self weight, and the processing cost is relatively high.

The invention content is as follows:

the invention provides a vibration energy collector device for overcoming the defects in the prior art.

The application provides the following technical scheme:

the utility model provides a vibration energy harvester device, it includes the main part, is equipped with the cantilever in the main part, its characterized in that: the cantilever is provided with a piezoelectric sheet, the peripheral surface of the main body is provided with a texture layer, and the piezoelectric sheet is provided with a lead which is matched with the rectifier in an electric signal connection way.

On the basis of the technical scheme, the following further technical scheme can be provided:

the main body is a tubular structure, and the section of the main body is circular, square, triangular, semicircular, T-shaped, K-shaped or Y-shaped.

The texture patterns of the texture layer are a group of hexagons or a group of diamonds or a group of trapezoids.

The groove body is a through groove, and the end part of the groove wall is connected with a fixed object.

Two groove bodies are arranged at one end part of the cantilever.

The invention has the advantages that:

the invention has simple structure and convenient use, effectively improves the pneumatic performance of the system, further improves the energy acquisition efficiency, improves the response capability of the system in a low-frequency state, and simultaneously reduces the vibration of the base caused by the action of fluid.

Description of the drawings:

FIG. 1 is a schematic structural view of embodiment 1 of the present invention;

FIG. 2 is a schematic structural view of embodiment 1 of the present invention after installation;

FIG. 3 is a schematic structural view of embodiment 2 of the present invention;

FIG. 4 is a schematic view of a turbulent flow of different cross-sections;

FIG. 5 is a schematic view of a different shape of the sub-cantilever;

fig. 6 is a velocity profile of the bulk vortex-induced response characteristic in example 2;

fig. 7 is a pressure distribution diagram of the main body vortex response characteristic in embodiment 2.

The specific implementation mode is as follows:

example 1:

as shown in fig. 1 to 2, a vibration energy harvester device includes a square tubular body 1 as a turbulent fluid, a mount 1a fixedly attached to a side wall of one side, cantilevers 2 inserted into the mount 1a, the cantilevers 2 being vertically distributed to the side.

The one end tip of cantilever 2 is equipped with the cell body 3 of a rectangle, cell body 3 for leading to the groove and run through cantilever 2 upper and lower surface, the cell wall thickness of cell body 3 both sides is the same, installs piezoelectric patch 4 on the arm body of cantilever 2 in cell body 3 one side.

A group of hexagonal grooves are uniformly distributed on the other three surfaces of the main body 1, so that texture layers 5 are formed on the three side walls of the main body 1. A lead wire not shown in the figure is connected to the piezoelectric plate 4 and is in connection fit with a rectifier not shown in the figure through the lead wire, so that the generated alternating current is converted into direct current.

The end part of the groove body 3 is fixedly connected with the base 6.

Example 2:

as shown in fig. 3, a vibration energy harvester device comprises a circular main body 1 as a turbulent flow body, a mounting base 1a fixedly connected to a side wall of one side, cantilevers 2 inserted into the mounting base 1a, and the cantilevers 2 vertically distributed to the side.

A group of grooves formed by triangular edges are uniformly distributed on the outer circular surface of the main body 1, so that texture layers 5 are formed on the three side walls of the main body 1. A lead wire not shown in the figure is connected to the piezoelectric plate 4 and is in connection fit with a rectifier not shown in the figure through the lead wire, so that the generated alternating current is converted into direct current.

The end part of the groove body 3 is fixedly connected with the base 6.

Example 3:

as shown in fig. 5, a vibration energy harvester device comprises a square tubular main body 1 as a turbulent flow body, a mounting base 1a fixedly connected to a side wall of one side, cantilevers 2 inserted into the mounting base 1a, and the cantilevers 2 vertically distributed to the side surface.

The end part of one end of the cantilever 2 can be provided with two groove bodies 3 except the rectangular groove body 3, the two groove bodies 3 are distributed side by side, and the thicknesses of the three groove walls are the same, so that the end part of one end of the cantilever 2 is in a fork shape. The groove body 3 is a through groove penetrating through the upper surface and the lower surface of the cantilever 2, the thicknesses of the groove walls on two sides of the groove body 3 are the same, and the piezoelectric plate 4 is arranged on the arm body of the cantilever 2 on one side of the groove body 3.

The end part of the groove body 3 is fixedly connected with the base 6.

As shown in fig. 4, the body 1 may be a columnar structure having a triangular or semicircular or T-shaped or K-shaped or Y-shaped cross section as a turbulent flow in addition to the tubular body 1 of the above-described outer shape.

As shown in fig. 6 and 7, the texture on the spoiler can be regarded as a second-order spoiler, which can interfere the fluid again, and the flow characteristic of the interfered fluid changes, so that the vortex-induced response characteristic of the system is influenced, the speed required by the cantilever beam to vibrate when acting on the spoiler is further reduced, the vibration response of the cantilever at low wind speed is further ensured, and the power generation effect of the piezoelectric patch is enhanced.

The prior art cantilever, example 1 and example 3 were tested and under the same conditions, the prior art generated a vibration frequency of 52.76HZ, example 1 generated a vibration frequency of 30.98 HZ, and example 3 generated a vibration frequency of 45.286 HZ. It can be seen that the base of example 1 produced the lowest frequency of vibration.

Claims

1. The utility model provides a vibration energy harvester device, it includes main part (1), is equipped with cantilever (2) on main part (1), its characterized in that: the cantilever (2) one end tip is equipped with at least one cell body (3), is equipped with piezoelectric patches (4) on cantilever (2), is equipped with texture layer (5) on the outer peripheral face of main part (1), is equipped with the wire on piezoelectric patches (4) and forms the cooperation of being connected of electric signal with the rectifier.

2. A vibration energy harvester device according to claim 1 wherein: the main body (1) is of a tubular structure, and the section of the main body is circular, square, triangular, semicircular, T-shaped, K-shaped or Y-shaped.

3. A vibration energy harvester device according to claim 1 wherein: the texture pattern of the texture layer (5) is a group of hexagons or a group of rhombuses or a group of trapezoids.

4. A vibration energy harvester device according to claim 1 wherein: the groove body (3) is a through groove, and the end part of the groove wall is connected with a fixed object.

5. A vibration energy harvester device according to claim 1 wherein: two groove bodies (3) are arranged at one end part of the cantilever (2).