CN214544152U - Piezoelectric-electromagnetic combined type energy harvester based on wave motion - Google Patents

Abstract

The utility model discloses a piezoelectricity-electromagnetism combined type energy accumulator based on wave motion, which comprises a shell of the piezoelectricity-electromagnetism combined type energy accumulator, and a guide rail component, a piezoelectricity power generation module and an electromagnetism power generation module which are arranged in the shell. The piezoelectric power generation module is characterized in that a piezoelectric sheet is caused to vibrate to generate electric energy under the action of low-frequency motion of sea waves. The electromagnetic power generation module is characterized in that the piezoelectric cantilever beam is triggered by the low-frequency motion of sea waves to vibrate, the magnet is driven to vibrate, and the magnet generates displacement relative to the closed coil, so that magnetic induction lines are cut, and electric energy is generated. The device utilizes the wave motion of arbitrary direction to produce the electric energy, has improved the generating efficiency, and the inside annular of device arranges, has improved the stability of device, has compensatied the not enough of current wave energy collection technique.

Description

Piezoelectric-electromagnetic combined type energy harvester based on wave motion

Technical Field

The utility model relates to an ocean energy collection field specifically is a piezoelectricity-electromagnetism combined type energy accumulator based on wave motion.

Background

In the ocean, sea waves are ubiquitous and contain huge energy, the energy density of the sea waves is higher than that of solar energy and wind energy, and the sea waves can supply energy continuously, so that the sea wave energy generation becomes one of the most potential modes for exploiting ocean energy.

At present, solar energy and chemical batteries are commonly used in an alternating manner to power marine observation telemetry devices, such as marine buoys, marine vehicles, which require long-term, continuous operation. Chemical batteries have a limited life and are not normally powered in extremely harsh environments, and recycling chemical batteries can cause environmental pollution. Although solar energy is a clean new energy, the energy harvesting is limited in the case of night, cloudy days and the like. For ocean equipment, if elements stop working, huge loss is caused, and the development and utilization of the energy harvesting device based on the wave motion have important significance for the monitoring and development of the ocean.

At present, the energy harvesting devices which can be integrated in ocean equipment are relatively few, most of the energy harvesting devices are directly contacted with seawater, and the service life of the energy harvesting devices is shortened due to the corrosivity of the seawater. Traditional low frequency wave energy harvester is mostly single friction, electromagnetism or piezoelectricity electricity generation, and the combined type energy harvesting device is less to the energy harvesting direction is single. Because the frequency of wave motion is lower and unstable, the traditional piezoelectric energy harvester has narrow working frequency, and the energy conversion efficiency is very low.

Disclosure of Invention

Based on the above, it is necessary to provide a piezoelectric-electromagnetic composite energy harvester based on wave motion, so that the wave energy can be continuously, stably and efficiently utilized, the power generation efficiency is improved, and the actual needs are met.

The utility model discloses a following technical scheme realizes.

The piezoelectric-electromagnetic combined type energy harvester based on sea wave motion is characterized in that the energy harvester can convert sea wave energy into electric energy for supplying power to ocean observation telemetering equipment such as ocean buoys and the like. The piezoelectric-electromagnetic combined type energy harvester based on sea wave motion comprises a shell of the piezoelectric-electromagnetic combined type energy harvester, and a guide rail assembly, a piezoelectric power generation module and an electromagnetic power generation module which are arranged in the shell.

The guide rail assembly comprises a guide rail support column arranged on the bottom surface of the shell, and a guide rail annularly connected to the guide rail support column.

The piezoelectric power generation module comprises a support fixed on the bottom surface of the shell, a substrate and a trapezoidal piezoelectric sheet, wherein a piezoelectric cantilever beam on the support is fixed, the free end of the piezoelectric cantilever beam is fixed with a magnet which is positioned on the same plane on the vertical direction of the guide rail, an iron ball in the guide rail is arranged in, and cymbal-shaped transducers on two end surfaces in the guide rail are fixed in a pasting mode.

The piezoelectric power generation module and the electromagnetic power generation module share the support and the magnet.

The trapezoidal piezoelectric pieces are adhered to the upper surface and the lower surface of the substrate, and when the piezoelectric cantilever beam drives the magnet to vibrate, the magnet is not in contact with the closed coil and the guide rail.

The natural frequency of the piezoelectric cantilever beam is changed by changing the mass of the magnet, so that the energy harvesting efficiency of the piezoelectric cantilever beam is improved, and the area of a coil cutting magnetic field is increased by changing the shape of the magnet, so that the energy harvesting efficiency of the electromagnetic power generation module is improved.

The guide rail with the guide rail pillar is threaded connection, all have from top to bottom the guide rail the piezoelectricity cantilever beam.

The number of the guide rails is 8 in the horizontal direction, and wave energy in any direction can be captured.

The utility model has the advantages that: the utility model moves the iron ball through the wave motion, thereby changing the magnetic force between the magnet and the iron ball, leading the piezoelectric cantilever beam to freely vibrate at the natural frequency thereof, and compared with the wave frequency, the vibration frequency of the piezoelectric cantilever beam is improved, and the piezoelectric efficiency of the trapezoidal piezoelectric sheet is increased; collecting kinetic energy and potential energy of the iron ball generated by sea waves through the cymbal-shaped piezoelectric transducer; the piezoelectric cantilever beam drives the magnet to vibrate, the magnet and the closed coil generate relative displacement to perform cutting magnetic induction line motion, and the closed coil generates current to realize piezoelectric-electromagnetic combined energy harvesting; the inner part of the device is annularly arranged, the stability of the device is improved, the energy harvesting can be carried out in multiple directions, and the utilization rate of wave energy is improved; the guide rail and the guide rail support are in threaded connection, so that the installation and the maintenance of the energy harvester are facilitated.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic diagram of piezoelectric cantilever beam power generation and electromagnetic power generation.

Figure 3 is a front view of a piezoelectric cantilever.

Fig. 4 is a schematic diagram of the power generation of a piezoelectric transducer in cymbal form.

Fig. 5 a schematic view of a guide rail pillar.

FIG. 1-housing; 2-a support; 3-piezoelectric cantilever beam; 4-a magnet; 5-a guide rail; 6-guide rail support; 7-cymbal piezoelectric transducer; 8-iron ball; 9-a closed coil; 10-a substrate; 11-trapezoidal piezoelectric sheet.

Detailed Description

The present embodiment will be described below with reference to fig. 1 to 5.

A piezoelectric-electromagnetic combined type energy harvester based on sea wave motion is characterized by comprising a shell 1, a track assembly, a piezoelectric power generation module and an electromagnetic power generation module.

The shell 1 is integrated in equipment such as ocean buoys, so that the space of the equipment such as the ocean buoys can be effectively utilized, the corrosion resistance of the energy harvester is not considered, and the economical efficiency is better.

The guide rail assembly comprises a guide rail support 6 arranged on the bottom surface of the shell 1 and a guide rail 5 annularly connected on the guide rail support 6.

The piezoelectric power generation module comprises a support 2 fixed on the bottom surface of a shell 1, a piezoelectric cantilever beam 3 fixed on the support 2, a magnet 4 fixed at the free end of the piezoelectric cantilever beam 3 and positioned on the same plane with a guide rail 5 in the vertical direction, an iron ball 8 arranged in the guide rail 5, and cymbal-shaped transducers 7 fixed on two end surfaces in the guide rail 5 in a sticking mode.

The electromagnetic power generation module comprises a support 2, a magnet 4 and a closed coil 9, wherein the closed coil 9 is fixed on the support 2 and arranged around the magnet 4, and the piezoelectric power generation module and the electromagnetic power generation module share the support 2 and the magnet 4.

The piezoelectric cantilever 3 is composed of a substrate 10 and trapezoidal piezoelectric sheets 11, and the trapezoidal piezoelectric sheets 11 are adhered to the upper surface and the lower surface of the substrate 10.

The piezoelectric power generation module is characterized in that a piezoelectric sheet is caused to vibrate to generate electric energy under the action of low-frequency motion of sea waves. The electromagnetic power generation module is characterized in that the piezoelectric cantilever beam 3 is triggered by the low-frequency motion of sea waves to vibrate, the magnet 4 is driven to vibrate, and the magnet 4 generates displacement relative to the closed coil 9, so that magnetic induction lines are cut, and current is generated.

When the piezoelectric cantilever beam drives the magnet 4 to vibrate up and down, the magnet 4 is not in contact with the guide rail 5 and the closed coil 9.

The natural frequency of the piezoelectric cantilever beam 3 is changed by changing the mass of the magnet 4, so that the energy harvesting efficiency of the piezoelectric cantilever beam is improved, and the area of a coil cutting magnetic field is increased by changing the shape of the magnet 4, so that the energy harvesting efficiency of the electromagnetic power generation module is improved.

The guide rail 5 is in threaded connection with the guide rail pillar 6, so that the energy harvester is convenient to install and maintain. Compared with a welding connection mode, the threaded connection has the advantages of simple operation, convenient assembly and disassembly and low cost, and compared with a riveting connection mode, the threaded connection has high strength and high rigidity.

The number of the guide rails 5 is 8 in the horizontal direction, on one hand, the energy harvester can capture wave energy in any direction, the utilization rate of the wave energy is improved, and on the other hand, the internal parts are annularly arranged around the guide rail support 6, so that the stability of the energy harvester is improved.

The working state is that the power generation device is integrated in equipment such as an ocean buoy, the equipment such as the ocean buoy is inclined under the impact of sea waves, the energy harvester inclines along with the equipment such as the ocean buoy, the iron ball 8 rolls in the guide rail 5 and gradually approaches to the magnet 4 along with the rolling of the iron ball 8, the magnetic force between the magnet 4 and the iron ball 8 is gradually increased, so that the piezoelectric cantilever beam 3 bends towards the cylindrical rail 5, when the iron ball 8 further rolls and is far away from the magnet 4, the magnetic force is rapidly reduced, the magnetic force between the iron ball 8 and the magnet 4 is not enough to bend the piezoelectric cantilever beam 3, the piezoelectric cantilever beam 3 is released to freely vibrate at the natural frequency, and the trapezoidal piezoelectric sheet 11 on the substrate 10 deforms to generate power. When the iron balls 8 in the guide rail 5 roll to both ends of the guide rail, they collide with cymbal-shaped piezoelectric transducers 7 provided on both end surfaces in the guide rail, and the cymbal-shaped piezoelectric transducers 7 generate electric power. When the piezoelectric cantilever beam 3 drives the magnet 4 to vibrate, the magnet 4 generates displacement relative to the closed coil 9, so that magnetic induction lines are cut, and current is generated.

The above embodiments are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (4)

1. A piezoelectric-electromagnetic combined type energy harvester based on sea wave motion is characterized by comprising a shell of the piezoelectric-electromagnetic combined type energy harvester, a guide rail assembly, a piezoelectric power generation module and an electromagnetic power generation module, wherein the guide rail assembly, the piezoelectric power generation module and the electromagnetic power generation module are arranged in the shell, the guide rail assembly comprises a guide rail support arranged on the bottom surface of the shell and a guide rail annularly connected to the guide rail support, the piezoelectric power generation module comprises a support fixed on the bottom surface of the shell, a piezoelectric cantilever beam fixed on the support, a magnet fixed at the free end of the piezoelectric cantilever beam and positioned on the same plane with the guide rail in the vertical direction, an iron ball arranged in the guide rail and a cymbal-shaped energy converter fixed on two end surfaces in the guide rail in a sticking mode, the electromagnetic power generation module comprises a support, a magnet and a closed coil, the piezoelectric power generation module and the electromagnetic power generation module share the support and the magnet.

2. The piezoelectric-electromagnetic composite energy harvester based on wave motion of claim 1, wherein the trapezoidal piezoelectric pieces are adhered to the upper surface and the lower surface of the substrate, and when the piezoelectric cantilever beam drives the magnet to vibrate, the magnet is not in contact with the closed coil and the guide rail.

3. The piezoelectric-electromagnetic composite energy harvester based on wave motion of claim 1, wherein the natural frequency of the piezoelectric cantilever beam is changed by changing the mass of the magnet, so that the energy harvesting efficiency of the piezoelectric power generation module is improved, and the energy harvesting efficiency of the electromagnetic power generation module is improved by changing the shape of the magnet, so that the area of a coil cutting magnetic field is increased.

4. The piezoelectric-electromagnetic composite energy harvester based on wave motion of claim 1, wherein the guide rail is in threaded connection with the guide rail support, and the piezoelectric cantilever beam is arranged above and below the guide rail.

Images