CN214256159U

CN214256159U - Array type piezoelectric power generation equipment for capturing wave energy

Info

Publication number: CN214256159U
Application number: CN202120466749.0U
Authority: CN
Inventors: 李凯
Original assignee: Zhejiang University of Science and Technology ZUST
Current assignee: Zhejiang University of Science and Technology ZUST
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2021-09-21
Anticipated expiration: 2031-03-04

Abstract

The utility model discloses an array piezoelectric power generation equipment for catching wave energy, including hanging arm, support frame and installing two at least piezoelectric power generation devices on the support frame side by side. The piezoelectric power generation device comprises a floater, a swing rod and a power generation box, wherein the swing rod extends out of the power generation box, and one extending end of the swing rod is hinged with the floater. The power generation box comprises a box body, a central shaft supported on the inner wall of the half box body is arranged along the central axis of the box body, and a rotary table and two vibrating piece discs symmetrically arranged along the rotary table are sleeved on the central shaft; the vibrating piece disc is provided with at least two piezoelectric power generation assemblies along the circumferential direction, and the rotating disc is provided with at least two magnets penetrating through the rotating disc along the circumferential direction. The external environment transmits low-frequency vibration to the power generation box through the rocker, and the power generation box uses a plurality of piezoelectric power generation assemblies on the vibrating piece disc to match with a plurality of groups of magnets of the rotary disc, so that high-frequency vibration power generation of the piezoelectric power generation assemblies is realized, and the power generation efficiency is improved.

Description

Array type piezoelectric power generation equipment for capturing wave energy

Technical Field

The utility model belongs to the power generation facility field, concretely relates to array piezoelectricity power generation facility for catching wave energy.

Background

In order to realize self-power supply of a wireless sensor for monitoring the marine environment, numerous scholars at home and abroad propose a method for converting wave energy into electric energy by utilizing an electromagnetic induction law, a piezoelectric effect and a triboelectric effect so as to supply power to the wireless sensor, and design various small power generation devices. Most of the devices adopt a resonance type mechanical structure, for example, an electromagnetic power generation device, and a magnet vibrates in a reciprocating manner under the driving of waves to cut a magnetic induction line so as to generate induced electromotive force in a coil. Such resonant power generation devices achieve maximum output power when the external excitation frequency is equal to their own natural frequency.

The existing resonance type generating device can generate larger output power when the external excitation frequency is equal to the natural frequency of the existing resonance type generating device, namely, the existing resonance type generating device reaches a resonance state. However, the operating frequency range is very narrow, and the resonant power generation device can normally operate only in a narrow frequency range near the natural frequency. For most power generation devices based on environmental vibrations, the natural frequency of the power generation device itself is much higher than the frequency of the environmental vibrations. According to a theoretical formula, the output power of the power generation device is proportional to the third power of the working frequency of the power generation device. This means that the output power of the power plant will drop sharply when the excitation frequency of the external environment decreases. In order to make the output power as large as possible, the natural frequency of the power generation device must be close to the ambient vibration frequency. The environmental vibrations are low frequency vibrations, typically in the frequency range of 1-20Hz, the frequency of the waves is less than 5Hz, and in order to keep the natural frequency of the power plant in its vicinity, the overall size of the power plant must be increased, since, in general, the natural frequency of the power plant is inversely proportional to its overall size. However, the increase in the volume of the power generation device greatly reduces the output power density (the ratio of the output power to the working volume), and also causes a series of problems such as an increase in the manufacturing cost and an increase in the difficulty of installation.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an array piezoelectricity power generation facility for catching wave energy, external environment (for example wave) transmit the low frequency vibration to the power generation box through the rocker, and the power generation box uses a plurality of piezoelectricity power generation subassemblies on the piece dish that shakes to cooperate with the multiunit magnet of carousel, realizes the high frequency vibration electricity generation (piezoelectricity effect) of piezoelectricity power generation subassembly to improve the generating efficiency.

In order to solve the technical problem, the utility model discloses a following technical scheme:

an array piezoelectric power generation device for capturing wave energy comprises a suspension arm, a support frame and at least two piezoelectric power generation devices which are arranged on the support frame in parallel; the piezoelectric power generation device comprises a floater, a swing rod and a power generation box, wherein the swing rod extends out of the power generation box, and the extending end of the swing rod is hinged with the floater; wherein the content of the first and second substances,

the power generation box comprises a box body, the box body comprises two cylindrical half box bodies with one open ends, arc-shaped notches are formed in the upper edges of the side walls of the half box bodies, and arc-shaped notches of the two half box bodies are combined into an arc-shaped groove; a central shaft supported on the inner wall of the half box body is arranged along the central axis of the box body, and a rotary table and two vibrating piece discs symmetrically arranged along the rotary table are sleeved on the central shaft; the vibrating piece disc is provided with at least two piezoelectric power generation components along the circumferential direction, and each piezoelectric power generation component comprises a cantilever beam and piezoelectric pieces and magnets which are attached to the upper surface and the lower surface of the cantilever beam and are sequentially arranged along the radial direction; the turntable is provided with at least two magnets penetrating through the turntable along the circumferential direction;

the number of the piezoelectric power generation assemblies arranged in the inner space of each half box body is the same as that of the magnets on the rotary table, and the central lines of the magnets of the corresponding piezoelectric power generation assemblies and the magnets of the rotary table are on the same straight line;

the swing rod and the turntable are of an integrated structure, and the swing rod extends out of the box body from the arc-shaped groove.

In a specific embodiment, a rolling bearing is arranged between the turntable and the central shaft.

In a specific embodiment, sleeves are arranged between the rolling bearing and the two diaphragm plates and between the diaphragm plates and the half box body for axial positioning.

In a specific embodiment, the vibrating plate disc and the central shaft are circumferentially positioned by key connection.

In a specific embodiment, the turntable is provided with an arc-shaped through hole and/or a circular through hole along the circumferential direction.

In a specific embodiment, the magnets of the piezoelectric power generation assembly and the magnets of the turntable are both cylindrical.

In a specific embodiment, the cantilever beam of the piezoelectric power generation component is a brass sheet.

In one embodiment, the central angle of the arc-shaped slot is 100 degrees.

In a specific embodiment, the support frame is provided with a fixing buckle, and the box body of the power generation box is fixed on the support frame through the fixing buckle.

Adopt the utility model discloses following beneficial effect has:

1. the wave motion is converted into the rotary motion of the rotary plate by the floater and the swing rod, and the rotary motion of the rotary plate is converted into the up-and-down vibration of the cantilever beam by the magnets.

2. The cooperation of a plurality of piezoelectricity electricity generation subassemblies on the piece dish that shakes and a plurality of magnets of carousel constitutes the mechanism of raising the frequency, utilizes the mutual acting force between the magnet to drive the cantilever beam free oscillation, and the vibration of the higher frequency of reuse cantilever beam is generated electricity.

3. The output power and the power density are improved by combining the frequency raising mechanism and the piezoelectric power generation mechanism.

Drawings

Fig. 1 is a schematic structural diagram of an array type piezoelectric power generation device for capturing wave energy according to the present invention;

FIG. 2 is a partial structural sectional view of the power generation box;

FIG. 3 is an exploded schematic view of a power generation box;

FIG. 4 is a schematic diagram of a vibrating plate coil structure and a partial structure thereof;

FIG. 5 is an exploded view of the assembled structure of the vibrating plate disk and the central shaft;

fig. 6 is the working principle diagram of the power generation process of the utility model.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 6, the utility model discloses an array piezoelectric power generation device for catching wave energy, including hanging arm 20, support frame 21 and installing two at least piezoelectric power generation device on support frame 21 side by side, there is three piezoelectric power generation device in the embodiment shown in fig. 1, and three piezoelectric power generation device's box is fixed in support frame 21 by fixed knot 5 respectively. The piezoelectric power generation device comprises a floater 1, a swing rod 2 and a power generation box 3, an arc-shaped groove 4 with a central angle of 100 degrees is formed in the box body of the power generation box 3, the swing rod 2 extends out of the box body of the power generation box 3, and one end, extending out of the swing rod, of the swing rod is connected with the floater 1 in a hinged mode. In normal operation, the arm 20 may be suspended from a column at the edge of the offshore platform.

The box of the power generation box 3 is formed by assembling two cylindrical half-boxes 31 with one open ends (which can be connected by bolts or screws), the upper edges of the side walls of the half-boxes 31 are provided with arc-shaped notches, and the arc-shaped notches of the two half-boxes 31 are combined into an arc-shaped groove 4.

Be equipped with the center pin 8 that supports in half box 31 inner wall along the axis of box, the cover is equipped with carousel 6 and two vibrating plate discs 7 along 6 symmetries settings of carousel on the center pin 8. The vibrating piece disc 7 is provided with a plurality of piezoelectric power generation components 10 along the circumferential direction, and each piezoelectric power generation component 10 comprises a cantilever beam 11 (which can be a brass sheet with the thickness of 0.4mm and the tail part of the cantilever beam is fixedly installed) and a piezoelectric piece 12 and a magnet 13 which are attached to the upper surface and the lower surface of the cantilever beam 11 and are sequentially arranged along the radial direction. The turntable 6 is provided with a plurality of magnets 61 penetrating through the turntable 6 along the circumferential direction, and the swing rod 2 and the turntable 6 are of an integrated structure. The number of the piezoelectric power generation assemblies 10 provided in the inner space of each half case 31 is the same as the number of the magnets 61 on the turntable 6, and the center lines of the magnets 13 of the piezoelectric power generation assemblies 10 and the magnets 61 of the turntable 6 which correspond to each other at the time of power generation are aligned on a straight line.

The magnet 61 on the rotary table 6 can be installed in a through hole formed in the rotary table 6, and the magnet 61 transmits the kinetic energy of the oscillating bar 2 to the piezoelectric power generation assembly 10 in a magnetic coupling mode. The rotating disk 6 may be provided with an arc or circular hole along the circumferential direction to reduce the mass and the moment of inertia. The turntable 6 is mounted on the center shaft 8 via a rolling bearing 81, and separates a moving member (the turntable 6) from a fixed member (the center shaft 8) to rotate the turntable 6 relative to the center shaft 8 and the diaphragm plate 7. Sleeves 82 are arranged between the rolling bearing 81 and the two diaphragm discs 7 and between the diaphragm discs 7 and the half-box 31 for axial positioning, and the diaphragm discs 7 and the central shaft 8 are connected through keys 83 for circumferential positioning.

The power generation process of the piezoelectric power generation device is shown in fig. 6, and the principle is as follows: when the floater 1 swings up and down along with waves, the swing rod 2 swings up and down along with the waves, so that the rotating disc 6 rotates back and forth at a certain frequency. When the rotary disc 6 and the vibrating piece disc 7 rotate relatively, the magnet 13 on the cantilever beam 11 is subjected to the periodic magnetic force of the magnet 61 on the rotary disc 6, so that the cantilever beam 11 generates bending vibration. The piezoelectric sheet 12 adhered to the cantilever beam 11 is deformed, and according to the piezoelectric effect, the piezoelectric sheet deformed by an external force is polarized, and then generates electric energy.

In the above process, the cantilever 11 freely vibrates at its natural frequency, resulting in high frequency vibration. The swinging frequency of the rocker 2 is equal to the frequency of wave motion, the frequency is usually very low (<5Hz), but in the swinging process of the rocker 2, after the cantilever beam 11 is pulled by the magnet each time, the cantilever beam can freely vibrate at the natural frequency which is far higher than the frequency of waves and can reach 100-500 HZ. Therefore, the frequency is improved, and finally the output power and the energy conversion efficiency of the power generation device can be improved.

The utility model discloses to the problem of the wave energy electricity generation difficulty of the big amplitude of low frequency, combine together the mechanism of raising the frequency with the electromechanical conversion mechanism based on piezoelectric effect, improved the conversion efficiency of electric energy, also improved output density. In the aspect of realizing self-power for marine electronic devices such as wireless sensor that is used for marine environment monitoring, the utility model discloses very big application potential has.

It is to be understood that the exemplary embodiments described herein are illustrative and not restrictive. While one or more embodiments of the present invention have been illustrated in the accompanying drawings, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The array piezoelectric power generation equipment for capturing wave energy is characterized by comprising a suspension arm, a support frame and at least two piezoelectric power generation devices which are arranged on the support frame in parallel; the piezoelectric power generation device comprises a floater, a swing rod and a power generation box, wherein the swing rod extends out of the power generation box, and the extending end of the swing rod is hinged with the floater; wherein the content of the first and second substances,

2. The array piezoelectric power generating apparatus for capturing wave energy as claimed in claim 1, wherein a rolling bearing is provided between the turntable and the central shaft.

3. The array piezoelectric power generating apparatus for capturing wave energy as claimed in claim 2, wherein a sleeve is provided between the rolling bearing and the two diaphragm plates and between the diaphragm plates and the half case for axial positioning.

4. The array piezoelectric wave power generation apparatus of claim 3, wherein the diaphragm plate is circumferentially positioned with respect to the central shaft by a keyed connection.

5. The array piezoelectric power generating apparatus for capturing wave energy as claimed in claim 1, wherein the turntable is provided with arc-shaped through holes and/or circular through holes in a circumferential direction.

6. The array piezoelectric power generating apparatus for capturing wave energy according to claim 1, wherein the magnets of the piezoelectric power generating assembly and the magnets of the turntable are cylindrical.

7. The array piezoelectric power generating apparatus for capturing wave energy according to claim 1, wherein the cantilever beam of the piezoelectric power generating assembly is a brass sheet.

8. The array piezoelectric power generating apparatus for capturing wave energy according to claim 1, wherein the arc-shaped groove has a central angle of 100 degrees.

9. The array piezoelectric power generation device for capturing wave energy as claimed in claim 1, wherein a fixing buckle is provided on the support frame, and the box body of the power generation box is fixed on the support frame through the fixing buckle.