CN106555727B - An ocean wave energy piezoelectric generator and its working method - Google Patents

Abstract

The invention discloses an ocean wave energy piezoelectric generating device and its working mode. The ocean wave energy piezoelectric generating device comprises a float, a counterweight device and a connecting rod. The inside of the float is provided with a piezoelectric power generation device, the piezoelectric power generation device is connected with the inner wall of the spherical float through the end of the elastic beam, a number of piezoelectric ceramic sheets are arranged on the upper and lower surfaces of the elastic beam, and the connecting rod The upper end is connected with the elastic beam of the piezoelectric generating device through the sealing device, and the lower end of the connecting rod is fixed with the counterweight device. When working, the float, the counterweight device and the connecting rod form a two-degree-of-freedom resonance system, which generates relative motion under the excitation of ocean waves, and converts mechanical energy into electrical energy output through the periodic vibration of the piezoelectric generator. The invention makes full use of ocean wave energy for piezoelectric power generation, has the characteristics of simple and compact structure, easy installation and implementation, and is favorable for popularization and application.

Description

An ocean wave energy piezoelectric generator and its working method

technical field

The invention relates to an ocean wave energy power generation device, in particular to an ocean wave energy piezoelectric power generation device and a working method thereof.

Background technique

As an important marine energy, ocean wave energy has great development and utilization value. With the rapid development of modern technology, various ways to utilize ocean wave energy have been proposed. It mainly includes floating power generation, oscillating water column power generation and pendulum wave power generation. The traditional floating power generation methods mostly use complex floating and power generation mechanisms, and at the same time, the power generation mechanism is complex and the energy utilization rate is low.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an ocean wave energy piezoelectric power generation device and its working mode in view of the defects involved in the background technology.

The present invention adopts the following technical solutions for solving the above-mentioned technical problems:

An ocean wave energy piezoelectric power generation device, comprising a float, a counterweight device and a connecting rod;

The float is provided with a sealed cavity, and a piezoelectric generator is arranged in the cavity;

The connecting rod includes an upper connecting rod, a lower connecting rod and an elastic device. One end of the upper connecting rod is connected to one end of the lower connecting rod through the elastic device, and the other end extends into the float and the piezoelectric generator. The device is fixedly connected, and the other end of the lower connecting rod is fixedly connected to the counterweight device;

The float floats on the water surface, and the counterweight device sinks to the bottom of the water. The float, the counterweight device and the connecting rod form a two-degree-of-freedom resonance system, which can generate relative motion under the excitation of ocean waves.

As a further optimized solution of an ocean wave energy piezoelectric power generation device of the present invention, the elastic device adopts a spring.

As a further optimized solution of an ocean wave energy piezoelectric power generation device of the present invention, the piezoelectric power generation device includes a connecting plate and a plurality of piezoelectric power generation units;

The piezoelectric generating unit includes an elastic beam and a plurality of piezoelectric ceramic sheets arranged on the upper and lower surfaces of the elastic beam. One end of the elastic beam is fixedly connected to the connecting plate, and the other end is fixedly connected to the cavity wall of the float. ;

The elastic beams of each piezoelectric generating unit are located on the same plane;

The upper connecting rod extends into the float and is fixedly connected to the connecting plate.

As a further optimized solution of an ocean wave energy piezoelectric power generation device of the present invention, a sealing device for waterproofing is provided at the joint between the upper connecting rod and the bottom of the float.

As a further optimized solution of an ocean wave energy piezoelectric power generation device of the present invention, the connecting plate is provided with a through hole for the upper connecting rod to pass through, and the upper connecting rod passes through the through hole on the connecting plate One end is provided with a spherical structure for limiting.

As a further optimized solution of the piezoelectric generating device for ocean wave energy of the present invention, the number of the piezoelectric generating units is 8, and the included angles between the elastic beams of each piezoelectric generating unit are equal.

As a further optimized solution of an ocean wave energy piezoelectric power generation device of the present invention, the piezoelectric ceramic sheets are all polarized along the thickness direction.

The invention also discloses a working mode based on the marine wave energy piezoelectric power generation device, comprising the following steps:

Step 1), the float is impacted by ocean waves and the relative position of the counterweight device changes, causing the connecting rod to vibrate;

Step 2), the axial displacement of the upper end of the upper connecting rod is generated, and the elastic beam and the piezoelectric ceramic sheet of each piezoelectric generating unit are driven to generate bending vibration;

Step 3), the surface of the piezoelectric ceramic sheet along the thickness direction generates charges to realize piezoelectric power generation;

Step 4), the elastic device stores the energy of ocean wave impact;

Step 5), the elastic device transmits energy to the upper connecting rod to drive the elastic beams and piezoelectric ceramic sheets of each piezoelectric generating unit to bend and vibrate, so as to realize piezoelectric power generation.

Compared with the prior art, the present invention adopts the above technical scheme, and has the following technical effects:

The present invention makes full use of the huge kinetic energy of the wave surging on the water surface and converts it into electrical energy, and develops the natural energy of the wave surging into the satellite positioning equipment, wireless communication system, hydrological monitoring and sonar detection device of the present invention. Electric energy is conducive to the utilization and development of clean energy, and is in line with the development trend of human clean and efficient electric energy. The structure of the invention is simple and compact, which is convenient for installation and implementation, and is beneficial to popularization and application.

Description of drawings

Fig. 1 is the structural principle schematic diagram of the marine wave energy piezoelectric power generation device of the present invention;

2 is a schematic structural diagram of an array-type elastic beam of a piezoelectric generating unit of a float of the present invention;

Fig. 3 is the schematic diagram that the piezoelectric generating unit of the float is connected with the connecting rod;

Fig. 4 is the schematic diagram of the connection between the counterweight device and the connecting rod;

FIG. 5 is a schematic diagram of the power generation principle of the piezoelectric power generation unit of the float;

Fig. 6 is the schematic diagram that the satellite positioning system and the communication system are arranged in the float;

Fig. 7 is the schematic diagram of setting detection system and communication system in the counterweight device;

Figure 8 is an application form in which a power generation device is also placed in the counterweight device;

Figure 9 is a form of application using a float array.

In the figure, 1-float, 11-sealing device, 2-counterweight device, 3-connecting rod, 31-spring, 32-upper connecting rod, 33-lower connecting rod, 34-connecting plate, 4-piezoelectric generator , 41-elastic beam, 42-piezoelectric ceramic sheet, 5-detection device, 6-communication device, 7-positioning device, 8-sonar detection device.

Detailed ways

Below in conjunction with accompanying drawing, the technical scheme of the present invention is described in further detail:

As shown in Figure 1, the marine wave energy piezoelectric power generation device of the present invention is applied to the sea surface in the ocean or the water area where fluctuation, surge, and tidal energy are generated, and the energy generated by the wave surge is fully utilized and converted into electrical energy. The sea surface float piezoelectric generating device of the present invention includes a float 1 , a counterweight device 2 , and a connecting rod 3 connecting the float 1 and the counterweight device 2 . The float 1 and the counterweight device 2 of the present invention adopt a sealed structure.

The float 1 is provided with a sealed cavity, and the cavity is provided with a piezoelectric generator 4; the connecting rod 3 includes an upper connecting rod 32, a lower connecting rod 33 and an elastic device 31, and one end of the upper connecting rod 32 passes through the elastic device 31 and the lower connecting rod. One end of 33 is connected, the other end extends into the float 1 and is fixedly connected to the piezoelectric generator 4, and the other end of the lower connecting rod 33 is fixedly connected to the counterweight device 2; the float 1 floats on the water surface, and the counterweight device 2 sinks to the bottom. The float 1, the counterweight device 2 and the connecting rod 3 form a two-degree-of-freedom resonance system, which can generate relative motion under the excitation of ocean waves.

The elastic device 31 preferably adopts a spring.

The piezoelectric generating device 4 arranged inside the float 1 includes a connecting plate 34 and several piezoelectric generating units. The piezoelectric generating unit includes an elastic beam 41 and a plurality of piezoelectric ceramic sheets 42 arranged on the upper and lower surfaces of the elastic beam 41. The elastic beam One end of 41 is fixedly connected to the connecting plate 34, and the other end is fixedly connected to the cavity wall of the float 1; the elastic beams 41 of the piezoelectric generating units are located on the same plane; the upper connecting rod 32 extends into the float 1 and the The connecting plates 34 are fixedly connected. A sealing device 11 for waterproofing is provided at the joint of the upper connecting rod 32 and the bottom of the float 1 . In this embodiment, the float 1 adopts a sealed spherical structure, and can also adopt other types such as a truncated cone, a conical truncated cone, and the like.

2, in a specific embodiment, the piezoelectric power generation device 4 is provided with eight piezoelectric power generation units 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, and the elastic beams 41 of the piezoelectric power generation units are arranged between The included angles are equal. Among them, the piezoelectric generating units 4a and 4b are symmetrical, the piezoelectric generating units 4c and 4d are symmetrical, the piezoelectric generating units 4e and 4f are symmetrical, and the piezoelectric generating units 4g and 4h are symmetrical. Multiple groups of piezoelectric generating units can be integrally formed in mechanism, so that a structure such as a through hole can be provided at the center of the piezoelectric generating device when it is convenient for the fixed connection and cooperation with the connecting rod 3 . When the piezoelectric power generation device of the present invention operates, the force generated by the external impact force on the piezoelectric power generation device can be sufficiently and uniformly converted into the electric charge energy of the efficient piezoelectric effect.

In a specific embodiment, an array of elastic beams 41 is formed by a plurality of piezoelectric generating units, wherein the elastic beams 41 are made of elastic materials, and the piezoelectric ceramic sheets 42 are all polarized along the thickness direction.

Referring to FIG. 3 , the connecting rod 3 includes an upper connecting rod 32 , a lower connecting rod 33 and a spring 31 connecting the middle of the upper and lower connecting rods 32 and 33 . The upper connecting rod 32 protrudes into the interior of the float 1 through the sealing device 11, the connecting plate 34 is provided with a through hole for the upper connecting rod 32 to pass through, and one end of the upper connecting rod 32 passing through the upper through hole of the connecting plate 34 is provided for Limiting spherical structure.

Referring to FIG. 4 , the lower connecting rod 33 of the connecting device is fixedly connected with the counterweight device 2 .

In order to cooperate with the piezoelectric power generation device, the piezoelectric power generation device further includes a voltage conversion circuit device, and the voltage conversion circuit device includes a rectifier circuit, a voltage stabilization charging circuit, a power storage device, a control device and an output device.

In a specific embodiment, the upper and lower connecting rods 32 and 33 of the connecting rod 3 of the present invention can be made of corrosion-resistant materials to increase the service life in water, and the spring 31 can be treated with corrosion resistance to increase the use of life.

The working mode of the ocean wave energy piezoelectric power generation device includes the following steps:

Step 1, the relative position of the float 1 is changed by the impact of the ocean wave and the counterweight device 2, causing the connecting rod 3 to vibrate;

In step 2, the axial displacement of the upper end of the upper connecting rod 32 is generated, and the elastic beam 41 and the piezoelectric ceramic sheet 42 of each piezoelectric generating unit are driven to generate bending vibration;

Step 3, the surface of the piezoelectric ceramic sheet 42 along the thickness direction generates charges to realize piezoelectric power generation;

Step 4, the elastic device 31 stores the energy of the ocean wave impact;

Step 5, the elastic device 31 transmits energy to the upper connecting rod 32 to drive the elastic beam 41 and the piezoelectric ceramic sheet 42 of each piezoelectric generating unit to bend and vibrate, so as to realize piezoelectric power generation.

As shown in Figure 5, in order to facilitate the understanding of the power generation process of the power generation device of the present invention, the following brief description is made:

In the float 1 of the present invention, under the action of the upward surge of the waves on the sea surface, after the upper connecting rod 32 of the connecting rod 3 transmits the force of the sea wave to the piezoelectric generating device 4, the piezoelectric ceramic sheet on the piezoelectric generating device 4 Deformation is generated to generate and store electrical energy. Under the force of the first cycle of the ocean wave, the elastic beam 41 deforms upward from the first initial period t=nT, which drives the piezoelectric ceramic sheet 42 to also bend upward to generate deformation and then generate electric charges. Change and accumulate electric energy in the state of t=T/4+nT in the 1/4th cycle. When the upper connecting rod 32 of the connecting rod 3 is no longer subjected to the force of the sea wave, the elastic beam 41 and the piezoelectric ceramic sheet 42 are in the first /2 cycle t=T/2+nT state, the state returns to normal and the state is horizontal, and the downward fluctuation of the 3/4 cycle of the ocean wave pushes the upper connecting rod 32 of the connecting rod 3 to act on the elastic beam 41, and the elastic The beam 41 drives the piezoelectric ceramic sheet 42 to bend downward in the 3rd/4th cycle t=3T/4+nT state to generate deformation, thereby generating charge changes and accumulating electrical energy. When the waves no longer act on the upper connecting rod 32 of the connecting rod 3 , it is defined that the elastic beam 41 and the piezoelectric ceramic sheet 42 return to the level of the initial period t=nT. Repeating this, the upper connecting rod 32 of the connecting rod 3 pushes the elastic beam 41 and the piezoelectric ceramic sheet 42 to deform under the surging force of the ocean waves and then stores electric energy. When the piezoelectric ceramic sheet 42 returns to the horizontal state, the elastic beam 41 drives the piezoelectric ceramic sheet 42 to periodically and continuously accumulate electric energy, thereby realizing electric energy accumulation and converting bit electric energy through the generating piezoelectric device 4 to supply it to the electrical equipment.

The float 1 in this embodiment adopts a sealed spherical structure, and in other embodiments, other types such as ellipsoid, cylindrical, or cone-bottom platform can also be used.

The weight device 2 in this embodiment adopts a sealed spherical structure, and in other embodiments, other types such as ellipsoid, cylindrical, or cone-bottom platform can also be used.

The working principle of the marine wave energy piezoelectric power generation device according to an embodiment of the present invention is briefly described as follows:

When the marine wave energy piezoelectric generating device of the present invention is placed on the sea surface or other water surface where waves are generated, the spherical float 1 floats on the sea surface, the counterweight device 2 is located under the sea surface, the float 1, the connecting rod 3, The counterweight device 2 forms a two-degree-of-freedom vibration system, which generates relative motion under the excitation of ocean waves. Part of the energy is bent and deformed to form charges through the connecting rod 3 of the piezoelectric ceramic sheet of the piezoelectric generator device of the float. Piezoelectric power generation is realized by collecting and converting the charges on the surface of the piezoelectric ceramic sheets distributed in the array, and the other part of the energy is stored. In a vibrating system, it is gradually released in subsequent vibrations.

As shown in FIG. 6 , in a specific embodiment, a detection device 5 , a communication device 6 and a positioning device 78 connected to the piezoelectric generator 4 are also provided inside the float 1 , and the detection device 5 receives the power supply of the piezoelectric generator 4 to realize the sea surface The positioning device 7 is used to realize the maritime position positioning of the present invention, and the communication device 6 is connected to other communication equipment such as communication satellites, ground communication base stations or sea communication base stations to realize data communication.

As shown in FIG. 7 , in a specific embodiment, a hydrological monitoring and sonar detection device 8 is also installed in the counterweight device, which can perform underwater detection and transmit data to a remote base station through a wireless communication device 7 in the float.

In practical applications, as shown in Figure 8, in order to improve the power generation efficiency, a power generation device can also be installed in the counterweight device. The power generation principle of the power generation device is the same as that of the power generation device in the float. The device provides power.

In practical applications, in order to improve the power generation efficiency, the method shown in FIG. 9 can also be used, and several floats with the same structure are used to form an array to maximize the utilization of wave energy.

To sum up, the present invention makes full use of the tidal kinetic energy generated by the surging waves of the ocean to excite a two-degree-of-freedom resonance system composed of a float, a counterweight and a connecting rod to generate relative motion, and convert the mechanical energy through the piezoelectric ceramic sheet of the power generating device. for electrical energy. The structure of the invention is simple and compact, convenient for installation and implementation, and favorable for popularization and application. At the same time, a satellite positioning system, a detection system, and a wireless communication system can be set up in the float, and a detection system can be set up in the counterweight device. The detection data and position information can be uploaded to the remote base station through the wireless communication system, and the control instructions of the remote base station can be received. , to realize the integrated function of sea surface monitoring and power generation.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as herein, are not to be taken in an idealized or overly formal sense. explain.

The specific embodiments described above further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. An ocean wave energy piezoelectric power generation device, characterized in that it comprises a float (1), a counterweight device (2) and a connecting rod (3); The float (1) is provided with a sealed cavity, and a piezoelectric generator (4) is arranged in the cavity; The connecting rod (3) includes an upper connecting rod (32), a lower connecting rod (33) and an elastic device (31), and one end of the upper connecting rod (32) is connected with the lower connecting rod (31) through the elastic device (31). One end of the rod (33) is connected, the other end extends into the float (1) and is fixedly connected to the piezoelectric generator (4), and the other end of the lower connecting rod (33) is connected to the counterweight device (2) ) is fixedly connected; The float (1) floats on the water surface, the counterweight device (2) sinks to the bottom of the water, and the float (1), the counterweight device (2) and the connecting rod (3) form a two-degree-of-freedom resonance system, which can be used in the ocean. Relative motion is generated under the excitation of waves; The elastic device (31) adopts a spring; The piezoelectric generating device (4) includes a connecting plate (34) and several piezoelectric generating units; The piezoelectric generating unit comprises an elastic beam (41) and a plurality of piezoelectric ceramic sheets (42) arranged on the upper and lower surfaces of the elastic beam (41), one end of the elastic beam (41) and the connecting plate (34) fixedly connected, and the other end is fixedly connected to the cavity wall of the float (1); The elastic beams (41) of each piezoelectric generating unit are located on the same plane; The upper connecting rod (32) extends into the float (1) and is fixedly connected to the connecting plate (34). 2. The marine wave energy piezoelectric power generation device according to claim 1, characterized in that, a sealing device (11) for waterproofing is provided at the joint of the bottom of the upper connecting rod (32) and the float (1). . 3 . The piezoelectric power generation device for ocean wave energy according to claim 1 , wherein the connecting plate ( 34 ) is provided with a through hole through which the upper connecting rod ( 32 ) passes, and the upper connecting rod ( 32 ) passes through. One end of the rod (32) passing through the through hole on the connecting plate (34) is provided with a spherical structure for limiting. 4 . The piezoelectric generating device for ocean wave energy according to claim 1 , wherein the number of the piezoelectric generating units is 8, and the included angles between the elastic beams of each piezoelectric generating unit are equal. 5 . 5 . The piezoelectric power generation device for ocean wave energy according to claim 1 , wherein the piezoelectric ceramic sheets ( 42 ) are all polarized along the thickness direction. 6 . 6. The working mode of the marine wave energy piezoelectric power generation device according to claim 1, characterized in that, comprising the following steps: Step 1), the relative position of the float (1) under the impact of ocean waves and the counterweight device (2) changes, causing the connecting rod (3) to vibrate; Step 2), the axial displacement of the upper end of the upper connecting rod (32) drives the elastic beam (41) and the piezoelectric ceramic sheet (42) of each piezoelectric generating unit to generate bending vibration; Step 3), the surface of the piezoelectric ceramic sheet (42) along the thickness direction generates charges to realize piezoelectric power generation; Step 4), the elastic device (31) stores the energy of ocean wave impact; Step 5), the elastic device (31) transmits energy to the upper connecting rod (32) to drive the elastic beam (41) and the piezoelectric ceramic sheet (42) of each piezoelectric generating unit to bend and vibrate to realize piezoelectric power generation.

Images