An axially supported piezoelectric wave energy conversion device for bridge piers

Abstract

The present invention provides an axially supported piezoelectric wave energy conversion device for bridge piers, comprising a buoyancy sleeve sleeved outside the bridge pier and a floating body sleeved outside the buoyancy sleeve, wherein piezoelectric films are provided on the inner and outer surfaces of the buoyancy sleeve, and protrusions in the radial direction of the pier are provided at the upper and lower ends of the buoyancy sleeve, and the protrusions face the floating body to prevent the floating body from falling off the buoyancy sleeve, and a plurality of buoyancy balls and a plurality of fixing brackets for fixing the buoyancy balls are provided on the bottom surface of the buoyancy sleeve, and a piezoelectric film is provided on the surface of the floating body, and the piezoelectric film is connected to a rechargeable battery or a lighting lamp or a warning device through a wire; compared with the prior art, the axially supported piezoelectric wave energy conversion device for bridge piers of the present invention has a high wave energy conversion rate, a simple structure, and strong environmental adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of wave energy, in particular to an axially supported piezoelectric wave energy conversion device for bridge piers. Background Art

[0002] Wave energy conversion devices are usually used to convert the kinetic energy generated by various movements of ocean waves into electrical energy. Currently, commonly used wave energy conversion devices are divided into shore, near-shore and offshore wave energy conversion devices according to the installation location. Shore-type wave energy conversion devices have a simple structure, but due to the large amount of sediment, the energy conversion efficiency is low, such as the Limpet wave energy conversion device; offshore wave energy conversion devices are mostly immersed wave energy conversion devices, which are low in cost, but because they are installed on the seabed, the captured energy will change with the change of sea level height and affect the marine ecology, such as the Oyster wave energy conversion device in the UK; offshore wave energy conversion devices are mostly floating wave energy conversion devices, which can obtain more energy, but require high-performance mooring devices. At the same time, the self-protection ability in extreme climate environments is high and the cost is high, such as the Wave dragon wave energy conversion device in the UK.

[0003] Piezoelectric materials are small in size and light in weight. Piezoelectric power generation devices have many advantages, such as high energy density, no electromagnetic interference, easy processing, and easy to achieve miniaturization and integration, and have very broad application prospects. In the prior art, it is rare to apply piezoelectric materials to wave energy conversion devices. The utility model patent with application number CN207010576U discloses a new piezoelectric power generation device that utilizes wave energy. It generates electricity by squeezing piezoelectric ceramic sheets using springs connected to cylindrical rods. It is suitable for underwater ocean currents and is relatively complicated to install. Compared with ocean currents, surface wave energy contains higher energy and generates more electricity, but there are few surface wave energy conversion devices. Summary of the invention

[0004] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides a wave energy conversion device with high wave energy conversion efficiency, simple structure and strong environmental adaptability.

[0005] The present invention provides an axially supported piezoelectric wave energy conversion device for bridge piers, comprising a buoyancy sleeve sleeved outside the bridge pier and a floating body sleeved outside the buoyancy sleeve, wherein piezoelectric films are provided on the inner and outer surfaces of the buoyancy sleeve, and protrusions in the radial direction of the pier are provided at the upper and lower ends of the buoyancy sleeve, and the protrusions face the floating body to prevent the floating body from falling off the buoyancy sleeve, and a plurality of buoyancy balls and a plurality of fixing brackets for fixing the buoyancy balls are provided on the bottom surface of the buoyancy sleeve, and a piezoelectric film is provided on the surface of the floating body, and the piezoelectric film is connected to a rechargeable battery or a lighting lamp or a warning device through a wire.

[0006] Compared with the prior art, the axially supported piezoelectric wave energy conversion device of the present application has the following advantages:

[0007] (1) Compared with the underwater ocean current, the use of buoyancy sleeves and floating bodies can make the wave energy conversion device float on the water surface, and the basic energy of wave energy is higher;

[0008] (2) Since the height of the waves at the seaside varies, the conversion of wave energy is affected to a certain extent. However, the present application provides protrusions at the upper and lower ends of the buoyancy sleeve, which can limit the movement of the floating body within the range of the buoyancy sleeve, so that the floating body always hits the buoyancy sleeve, and has strong environmental adaptability;

[0009] (3) When waves come, the inner surface of the buoyancy sleeve collides with the outer surface of the pier. The inner surface of the buoyancy sleeve is provided with a large area of ​​piezoelectric film, and the wave energy conversion efficiency is high; the outer surface of the buoyancy sleeve collides with the surface of the floating body, which not only squeezes the piezoelectric film on the outer surface of the buoyancy sleeve, but also squeezes the piezoelectric film on the surface of the floating body, further improving the wave energy conversion efficiency;

[0010] (4) A plurality of buoyancy balls are arranged on the bottom surface of the buoyancy sleeve, and the height of the buoyancy sleeve exposed from the horizontal plane can be adjusted, and the environmental adaptability is strong;

[0011] (5) The piezoelectric film transmits the converted electrical energy to the outside through wires, which can charge the battery or operate the lighting or warning device;

[0012] (6) The wave energy conversion device of the present application mainly adopts a buoyancy sleeve, a floating body, and a conductive film, has a simple structure, low material requirements, and is suitable for large-scale use.

[0013] Furthermore, the floating body may be annular or in other shapes, the internal structure may be a cavity or other structure that can float on the water surface, the material may be rubber or other materials, and the axial cross-section of the pier may be circular or in other shapes.

[0014] Furthermore, the height of the protrusions at the upper and lower ends of the buoyancy sleeve is greater than twice the distance from the piezoelectric film on the surface of the floating body to the piezoelectric film on the outer surface of the buoyancy sleeve. This is to prevent the other side of the floating body from falling off from the other side of the buoyancy sleeve when the piezoelectric film on one side of the floating body contacts the piezoelectric film on the outer surface of one side of the buoyancy sleeve in extreme cases, thereby increasing the stability of the wave energy conversion device.

[0015] Furthermore, a plurality of piezoelectric elements are disposed in the piezoelectric film, and the plurality of piezoelectric elements can further improve the energy conversion efficiency of the piezoelectric film.

[0016] Furthermore, a signal electrode and a ground electrode are provided on the piezoelectric film, the signal electrode is connected to the wire, and the ground electrode is connected to the bridge pier.

[0017] Furthermore, the fixing bracket is fixed to the bottom surface of the buoyancy sleeve by means of fastening screws, thereby enhancing the stability of the fixing bracket.

[0018] Furthermore, the plurality of buoyancy balls are arranged circumferentially along the inner surface of the buoyancy sleeve, so that the position of the buoyancy sleeve on the water surface is more stable, the inner surface of the buoyancy sleeve is in more complete contact with the outer surface of the pier, and the stability of the conversion efficiency is enhanced.

[0019] Furthermore, the buoyancy ball is an elastic hollow sphere, and the height of the buoyancy sleeve exposed to the horizontal plane can be adjusted by increasing or decreasing the number of the buoyancy balls, which provides greater flexibility.

[0020] Furthermore, the piezoelectric wave energy conversion device can be used in other underwater buildings or shore buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0022] Figure 1 A schematic side perspective view of an axially supported piezoelectric wave energy conversion device for a bridge pier in an embodiment;

[0023] Figure 2 is a schematic top view of an axially supported piezoelectric wave energy conversion device for a bridge pier in an embodiment;

[0024] Among them, 1. bridge pier, 2. buoyancy sleeve, 21. protrusion, 22. fixed bracket, 23. fastening screw, 3. annular floating body, 4. piezoelectric film, 41. signal electrode, 42. ground electrode, 5. buoyancy ball, 6. wire. DETAILED DESCRIPTION

[0025] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0026] In the present invention, the orientation or position relationship indicated by terms such as "outer surface", "inner surface", "axial", "radial", "circumferential", "upper end", "lower end", etc. is based on the orientation or position relationship shown in the accompanying drawings, and is only used to illustrate the relative position relationship between the components or components, and does not particularly limit the specific installation orientation of the components or components.

[0027] The terms "housing", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] An axially supported piezoelectric wave energy conversion device for a bridge pier 1, such as Figure 1 , 2 As shown, it includes a buoyancy sleeve 2 sleeved outside the bridge pier 1 and an annular floating body 3 sleeved outside the buoyancy sleeve 2, wherein the inner and outer surfaces of the buoyancy sleeve 2 are provided with a piezoelectric film 4, and the upper and lower ends of the buoyancy sleeve 2 are provided with protrusions 21 radial to the bridge pier 1, and the protrusions 21 face the annular floating body 3 to prevent the annular floating body 3 from falling off the buoyancy sleeve 2.

[0029] Twelve buoyancy balls 5 are arranged on the bottom surface of the buoyancy sleeve 2. The buoyancy balls 5 are elastic hollow spheres and are evenly arranged in the circumferential direction of the inner surface of the buoyancy sleeve 2. Each buoyancy ball 5 is fixed to a fixing bracket 22 on the bottom surface of the buoyancy sleeve 2, and the fixing bracket 22 is fixed to the bottom surface of the buoyancy sleeve 2 by a fastening screw 23.

[0030] A piezoelectric film 4 is provided on the surface of the annular floating body 3 .

[0031] The piezoelectric film 4 is connected to a rechargeable battery or a lighting lamp or a warning device through a wire 6 .

[0032] A signal electrode 41 and a ground electrode 42 are provided on the piezoelectric film 4 . The signal electrode 41 is connected to the wire 6 , and the ground electrode 42 is connected to the bridge pier 1 .

[0033] The working process of the axially supported piezoelectric wave energy conversion device of this embodiment is as follows: when waves come, the buoyancy sleeve 2 moves axially and radially on the bridge pier 1. Since the buoyancy sleeve 2 is sleeved on the outside of the bridge pier 1, one side of the inner surface of the buoyancy sleeve 2 will collide with the outside of the bridge pier 1 at this time, and the piezoelectric film 4 on the inner surface of the buoyancy sleeve 2 is deformed by force to generate voltage, and the rechargeable battery is charged or the lighting lamp and warning device are lit through the wire 6; when the waves change, the other side of the inner surface of the buoyancy sleeve 2 will collide with the outside of the bridge pier 1, converting the wave energy into electrical energy; at the same time, the annular floating body 3 will also When the buoyancy sleeve 2 collides, the piezoelectric film 4 on the surface of the annular floating body 3 and the piezoelectric film 4 on the outer surface of the buoyancy sleeve 2 are deformed by force to generate voltage, and the rechargeable battery is charged or the lighting lamp and the warning device are lit through the wire 6; furthermore, the buoyancy ball 5 supports the buoyancy sleeve 2 to move up and down, when the piezoelectric film 4 on one side of the inner surface of the annular floating body 3 contacts the piezoelectric film 4 on one side of the outer surface of the buoyancy sleeve 2, the distance from the piezoelectric film 4 on the other side of the annular floating body 3 to the piezoelectric film 4 on the outer surface of the buoyancy sleeve 2 will not exceed the height of the protrusion 21, thereby increasing the stability of the wave energy conversion device.

Claims

1. An axially supported piezoelectric wave energy conversion device for a bridge pier, comprising a buoyancy sleeve sleeved outside the bridge pier and a floating body sleeved outside the buoyancy sleeve, characterized in that: The inner and outer surfaces of the buoyancy sleeve are provided with piezoelectric films, and the upper and lower ends of the buoyancy sleeve are provided with radial protrusions of the pier, which face the floating body. The heights of the protrusions at the upper and lower ends of the buoyancy sleeve are greater than twice the distance from the piezoelectric film on the surface of the floating body to the piezoelectric film on the outer surface of the buoyancy sleeve. A plurality of buoyancy balls and a plurality of fixing brackets for fixing the buoyancy balls are provided on the bottom surface of the buoyancy sleeve. A piezoelectric film is provided on the surface of the floating body, and the piezoelectric film is connected to a rechargeable battery or a lighting lamp or a warning device through a wire. When waves come, the buoyancy sleeve moves axially and radially on the pier. Since the buoyancy sleeve is sleeved on the outside of the pier, one side of the inner surface of the buoyancy sleeve will hit the outside of the pier at this time, and the piezoelectric film on the inner surface of the buoyancy sleeve will be deformed by force to generate voltage and charge the rechargeable battery or light up the lighting and warning device through the wire; when the waves change, the other side of the inner surface of the buoyancy sleeve will collide with the outer side of the bridge pier, converting the wave energy into electrical energy; at the same time, the annular floating body will also collide with the buoyancy sleeve, and the piezoelectric film on the surface of the annular floating body and the piezoelectric film on the outer surface of the buoyancy sleeve will be deformed by force to generate voltage, and charge the rechargeable battery or light up the lighting and warning device through the wire; furthermore, the buoyancy ball supports the buoyancy sleeve to move up and down, when the piezoelectric film on one side of the inner surface of the annular floating body contacts the piezoelectric film on one side of the outer surface of the buoyancy sleeve, the distance from the piezoelectric film on the other side of the annular floating body to the piezoelectric film on the outer surface of the buoyancy sleeve will not exceed the height of the protrusion, thereby increasing the stability of the wave energy conversion device.

2. An axially supported piezoelectric wave energy conversion device for a bridge pier according to claim 1, characterized in that: The floating body may be annular in shape or in other shapes, and its internal structure may be a cavity or other structure that can float on the water surface. The material may be rubber or other materials, and the axial cross-section of the bridge pier may be circular or in other shapes.

3. An axially supported piezoelectric wave energy conversion device for a bridge pier according to claim 1, characterized in that: A plurality of piezoelectric elements are arranged in the piezoelectric film.

4. An axially supported piezoelectric wave energy conversion device for a bridge pier according to claim 1, characterized in that: A signal electrode and a ground electrode are arranged on the piezoelectric film. The signal electrode is connected to the wire, and the ground electrode is connected to the bridge pier.

5. An axially supported piezoelectric wave energy conversion device for a bridge pier according to claim 1, characterized in that: The fixing bracket is fixed on the bottom surface of the buoyancy sleeve by fastening screws.

6. An axially supported piezoelectric wave energy conversion device for a bridge pier according to claim 1, characterized in that: The plurality of buoyancy balls are arranged circumferentially along the inner surface of the buoyancy sleeve.

7. An axially supported piezoelectric wave energy conversion device for a bridge pier according to claim 1, characterized in that: The buoyancy balls are elastic hollow spheres, and the height of the buoyancy sleeve exposed above the horizontal plane can be adjusted by increasing or decreasing the number of the buoyancy balls.

8. An axially supported piezoelectric wave energy conversion device for a bridge pier according to claim 1, characterized in that: The piezoelectric wave energy conversion device can be used for other underwater buildings or shore buildings.

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