Piezoelectric power generation device based on wave energy

Abstract

The utility model provides a piezoelectric power generation device based on wave energy. The piezoelectric power generation device comprises a shell, a pin roller, a rotating shaft, a movable magnet, a fixed magnet, a piezoelectric plate and a connecting shaft, the piezoelectric plate is fixed on the inner side wall of the shell, and the fixed magnet is fixed on the piezoelectric plate; the movable magnet is arranged in the middle in the shell and spaced from the fixed magnet, and the polarities of the ends, close to each other, of the movable magnet and the fixed magnet are the same; the rotating shaft is arranged in the shell, one end of the connecting shaft is arranged in the shell, one end of the rotating shaft is fixed to the movable magnet, the other end of the rotating shaft is fixed to the end, in the shell, of the connecting shaft, the peripheral wall of the middle of the connecting shaft is rotationally connected with the side wall of the shell, and the other end of the connecting shaft extends out of the shell and is fixedly connected with the end of the roller. The pin roller is used for generating circumferential rotation through wave energy, and when the pin roller rotates, the rotating shaft and the movable magnet are sequentially driven to rotate. The utility model has the advantages of simple structure, small size and relatively low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore power generation, and in particular to a piezoelectric power generation device based on wave energy. Background Art

[0002] Wave power generation uses the energy of waves as a driving force to produce electricity. Ocean waves contain huge amounts of energy. The power of a sinusoidal wave per meter of crest width is P≈HT kW / m. In the formula, H is the wave height and T is the wave period. The global economically valuable wave energy extraction is estimated to be 100 million to 1 billion kW. The theoretical reserves of wave energy in China are about 70 million kW.

[0003] As my country's use of marine renewable energy has entered a large-scale development stage, it is characterized by being small, simple, and concentrated in coastal areas. Wave energy power generation devices in offshore and even inland rivers are a potential direction for the development of the industry. Most of the existing technologies are traditional wave energy power generation or large-scale construction equipment, which converts the energy of waves into mechanical, pneumatic or hydraulic energy, and then drives the generator to generate electricity through a transmission mechanism, gas turbine, water turbine or hydraulic motor. In the existing technology, there are offshore power generation platforms that integrate wave energy-driven friction generators, wave energy-coordinated wind power generation, and photovoltaic power generation with wind turbine power generation. The energy conversion cost of the device is extremely high, and the size is huge, which is not conducive to some small-scale power generation. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a piezoelectric power generation device based on wave energy, which has a simple structure, is conducive to miniaturization and has a relatively low cost.

[0005] The utility model provides a piezoelectric power generation device based on wave energy, comprising a shell, a roller, a rotating shaft, a moving magnet, a fixed magnet, a piezoelectric sheet and a connecting shaft; the piezoelectric sheet is fixed on the inner side wall of the shell, and the fixed magnet is fixed on the piezoelectric sheet; the moving magnet is arranged in the middle of the shell and is spaced apart from the fixed magnet, and the moving magnet and the fixed magnet have the same polarity at one end close to each other; the rotating shaft is arranged in the shell, one end of the connecting shaft is arranged in the shell, one end of the rotating shaft is fixed to the moving magnet, and the other end is fixed to one end of the connecting shaft in the shell, the outer peripheral wall in the middle of the connecting shaft is rotatably connected to the side wall of the shell, and the other end of the connecting shaft extends out of the shell and is fixedly connected to the end of the roller; the roller is used for circumferential rotation through wave energy, and when the roller rotates, the rotating shaft and the moving magnet are driven to rotate in turn.

[0006] Compared with the prior art, the present application has the following advantages: the roller rotates circumferentially due to the impact of the waves. When the roller rotates, it drives the connecting shaft, the rotating shaft and the moving magnet to rotate in turn. Since the moving magnet and the fixed magnet have the same polarity at one end close to each other, the magnetic field area between the moving magnet and the fixed magnet continuously changes during the rotation of the moving magnet, causing the repulsive force to continuously change, thereby causing the piezoelectric sheet to continuously deform to generate electricity. The structure is simple, conducive to miniaturization, and the cost is relatively low.

[0007] In a possible implementation, the moving magnet includes a cylindrical shell and a plurality of bar magnets, the bar magnets are evenly spaced and distributed on the outer peripheral wall of the cylindrical shell, and the bar magnets are arranged to extend axially along the cylindrical shell.

[0008] Compared with the prior art, the above technical solution can effectively make the magnetic field area between the moving magnet and the fixed magnet change continuously, so that the repulsive force changes continuously, thereby making the piezoelectric sheet continuously deform to generate electricity, and the shape of the cylindrical shell is conducive to uniform rotation in the circumferential direction.

[0009] In a possible implementation, the piezoelectric sheet and the fixed magnet are a pair; the two piezoelectric sheets are respectively fixed on the inner side walls of the shell in the upper and lower directions and are centrally symmetrically distributed, and the two fixed magnets are respectively fixed on the two piezoelectric sheets; the moving magnet is located between the two fixed magnets, and the moving magnet is concentrically arranged with the two fixed magnets.

[0010] Compared with the prior art, the above technical solution can further increase the power generation efficiency and is not likely to increase the weight of the shell due to the provision of too many piezoelectric sheets and fixed magnets.

[0011] In a possible implementation, the roller, the rotating shaft and the connecting shaft are a pair, and the two rollers, the rotating shaft and the connecting shaft are coaxially arranged in the transverse direction; bearings are arranged on the two transverse side walls of the shell, and the outer peripheral walls in the middle of the two connecting shafts are rotatably connected to the side walls of the shell through two bearings respectively; the two axial sides of the moving magnet are respectively fixed to one end of the two rotating shafts, the other ends of the two rotating shafts are respectively fixed to one end of the two connecting shafts, and the other ends of the two connecting shafts are respectively fixed to the ends of the two rollers.

[0012] Compared with the prior art, the above technical solution can effectively fix the moving magnet so that the moving magnet is located in the middle of the shell and can effectively drive the moving magnet to rotate. The bearing facilitates the two shafts to effectively rotate with the shell.

[0013] In a possible implementation, a plurality of blades evenly spaced apart are fixed to the outer peripheral wall of the roller, and the blades are used to contact the waves to drive the roller to rotate circumferentially.

[0014] Compared with the prior art, the blades using the above technical solution can effectively allow the rollers to rotate circumferentially under the force of waves.

[0015] In a possible implementation, the housing, the rollers, the connecting shaft and the blades are all made of stainless steel.

[0016] Compared with the prior art, the above technical solution can effectively prevent corrosion in seawater and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the utility model;

[0018] Description of reference numerals:

[0019] 1-housing, 2-roller, 3-rotating shaft, 4-moving magnet, 5-fixed magnet, 6-piezoelectric sheet, 7-connecting shaft, 11-bearing, 21-blade, 41-cylindrical housing, 42-bar magnet. DETAILED DESCRIPTION

[0020] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0021] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0022] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The present embodiment discloses a piezoelectric power generation device based on wave energy, comprising a shell 1, a roller 2, a rotating shaft 3, a moving magnet 4, a fixed magnet 5, a piezoelectric sheet 6 and a connecting shaft 7; the piezoelectric sheet 6 is fixed on the inner wall of the shell 1, and the fixed magnet 5 is fixed on the piezoelectric sheet 6; the moving magnet 4 is arranged in the middle of the shell 1 and is spaced apart from the fixed magnet 5, and the polarity of the ends of the moving magnet 4 and the fixed magnet 5 that are close to each other is the same; the rotating shaft 3 is arranged in the shell 1, and one end of the connecting shaft 7 is arranged in the shell 1, one end of the rotating shaft 3 is fixed to the moving magnet 4, and the other end is fixed to one end of the connecting shaft 7 in the shell 1, the outer peripheral wall in the middle of the connecting shaft 7 is rotatably connected to the side wall of the shell 1, and the other end of the connecting shaft 7 extends out of the shell 1 and is fixedly connected to the end of the roller 2; the roller 2 is used to rotate circumferentially through wave energy, and when the roller 2 rotates, it drives the connecting shaft 7, the rotating shaft 3 and the moving magnet 4 to rotate in turn.

[0025] In this embodiment, the piezoelectric sheet 6 needs to be electrically connected to an external power storage device or directly electrically connected to an external electrical device for collecting electrical energy. When the piezoelectric sheet 6 itself is in a stationary state, the piezoelectric material's positive piezoelectric effect is used to convert the mechanical strain applied by the outside into an internal potential. When the piezoelectric material is subjected to an external force in a specific direction, the material will deform, thereby causing polarization inside the material. This polarization will generate an equal amount of polarized charges on the surface of the piezoelectric material. By collecting these charges, the mechanical energy can be converted into electrical energy, thereby realizing power generation. The housing 1 needs to be sealed to prevent external water from infiltrating and affecting power generation; the roller 2 rotates circumferentially through the impact of the wave. When the roller 2 rotates, it drives the connecting shaft 7, the rotating shaft 3 and the moving magnet 4 to rotate in turn. Since the polarity of the end of the moving magnet 4 and the fixed magnet 5 that are close to each other is the same, during the rotation of the moving magnet 4, the magnetic field area between the moving magnet 4 and the fixed magnet 5 is constantly changing, so that the repulsive force is constantly changing, so that the piezoelectric sheet 6 is constantly deformed to generate electricity. The structure is simple, which is conducive to miniaturization and the cost is relatively low.

[0026] In some embodiments, the moving magnet 4 includes a cylindrical shell 41 and a plurality of bar magnets 42 . The bar magnets 42 are evenly spaced and distributed on the outer peripheral wall of the cylindrical shell 41 , and the bar magnets 42 are axially extended along the cylindrical shell 41 .

[0027] In this embodiment, each bar magnet 42 has the same polarity as the end close to the fixed magnet 5. When the cylindrical shell 41 rotates circumferentially, the bar magnets 42 are evenly spaced on the outer wall of the cylindrical shell 41, so the magnetic field area between the bar magnets 42 and the fixed magnet 5 keeps changing, causing the repulsive force to keep changing, thereby causing the piezoelectric sheet 6 to keep deforming to generate electricity, and the shape of the cylindrical shell 41 is conducive to uniform rotation in the circumferential direction.

[0028] In some embodiments, the piezoelectric sheet 6 and the fixed magnet 5 are a pair; the two piezoelectric sheets 6 are respectively fixed on the inner side walls of the shell 1 in the up and down directions and are centrally symmetrically distributed, and the two fixed magnets 5 are respectively fixed on the two piezoelectric sheets 6; the moving magnet 4 is located between the two fixed magnets 5, and the moving magnet 4 is concentrically arranged with the two fixed magnets 5.

[0029] In the present embodiment, it should be noted that the piezoelectric sheet 6 and the fixed magnet 5 are a pair, which can further increase the power generation efficiency and is not easy to increase the weight of the shell due to the arrangement of too many piezoelectric sheets and fixed magnets; it should be noted that those skilled in the art can completely set the shell 1 to a rectangular structure, and set piezoelectric sheets 6 and fixed magnets 5 on the four inner side walls of the shell 1, upper and lower, front and back. Although this will increase the power generation efficiency, it will also increase the weight of the shell 1, which is not conducive to lightweight and miniaturization.

[0030] In some embodiments, the roller 2, the rotating shaft 3 and the connecting shaft 7 are a pair, and the two rollers 2, the rotating shaft 3 and the connecting shaft 7 are coaxially arranged in the transverse direction; bearings 11 are arranged on the two transverse side walls of the shell 1, and the outer peripheral walls in the middle of the two connecting shafts 7 are rotatably connected to the side walls of the shell 1 through two bearings 11 respectively; the two axial sides of the moving magnet 4 are respectively fixed to one end of the two rotating shafts 3, and the other ends of the two rotating shafts 3 are respectively fixed to one end of the two connecting shafts 7, and the other ends of the two connecting shafts 7 are respectively fixed to the ends of the two rollers 2. The moving magnet 4 can be effectively fixed so that the moving magnet 4 is located in the middle of the shell 1, and can effectively drive the moving magnet 4 to rotate. The bearings 11 facilitate the two rotating shafts 3 to effectively rotate with the matching shell 1

[0031] In some embodiments, a plurality of blades 21 evenly spaced are fixed on the outer peripheral wall of the roller 2, and the blades 21 are used to contact with the waves to drive the roller 2 to rotate circumferentially. In this way, the roller 2 can be effectively subjected to force in the waves, thereby effectively rotating.

[0032] In some embodiments, the housing 1, the roller 2, the connecting shaft 7 and the blades 21 are all made of stainless steel, which effectively prevents corrosion in seawater and increases the service life.

[0033] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0034] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A piezoelectric power generation device based on wave energy, characterized in that: The invention comprises a housing (1), a roller (2), a rotating shaft (3), a moving magnet (4), a fixed magnet (5), a piezoelectric sheet (6) and a connecting shaft (7); the piezoelectric sheet (6) is fixed to the inner wall of the housing (1), and the fixed magnet (5) is fixed to the piezoelectric sheet (6); the moving magnet (4) is arranged in the middle of the housing (1) and is spaced apart from the fixed magnet (5), and the polarity of the ends of the moving magnet (4) and the fixed magnet (5) that are close to each other are the same; the rotating shaft (3) is arranged in the housing (1), and the connecting shaft (7) is fixed to the inner wall of the housing (1), and the fixed magnet (5) is fixed to the piezoelectric sheet (6); the moving magnet (4) is arranged in the middle of the housing (1) and is spaced apart from the fixed magnet (5), and the polarity of the ends of the moving magnet (4) and the fixed magnet (5) that are close to each other are the same; ) is arranged in the shell (1), one end of the rotating shaft (3) is fixed to the moving magnet (4), and the other end is fixed to one end of the connecting shaft (7) in the shell (1), the outer peripheral wall of the middle part of the connecting shaft (7) is rotatably connected to the side wall of the shell (1), and the other end of the connecting shaft (7) extends out of the shell (1) and is fixedly connected to the end of the roller (2); the roller (2) is used to rotate circumferentially through wave energy, and when the roller (2) rotates, it drives the rotating shaft (3) and the moving magnet (4) to rotate in turn.

2. The piezoelectric power generation device based on wave energy according to claim 1, characterized in that: The moving magnet (4) comprises a cylindrical shell (41) and a plurality of bar magnets (42), wherein the bar magnets (42) are evenly spaced and distributed on the outer peripheral wall of the cylindrical shell (41), and each bar magnet (42) is arranged to extend axially along the cylindrical shell (41).

3. The piezoelectric power generation device based on wave energy according to claim 2, characterized in that: The piezoelectric sheet (6) and the fixed magnet (5) are each a pair; the two piezoelectric sheets (6) are respectively fixed on the inner side walls of the shell (1) in the upper and lower directions and are centrally symmetrically distributed; the two fixed magnets (5) are respectively fixed on the two piezoelectric sheets (6); the moving magnet (4) is located between the two fixed magnets (5), and the moving magnet (4) and the two fixed magnets (5) are concentrically arranged.

4. The piezoelectric power generation device based on wave energy according to claim 3, characterized in that: The roller (2), the rotating shaft (3) and the connecting shaft (7) are each a pair, and the two rollers (2), the rotating shaft (3) and the connecting shaft (7) are coaxially arranged in the transverse direction; bearings (11) are arranged on the two transverse side walls of the housing (1), and the outer peripheral walls in the middle of the two connecting shafts (7) are rotatably connected to the side walls of the housing (1) through the two bearings (11); the two axial sides of the moving magnet (4) are respectively fixed to one end of the two rotating shafts (3), the other ends of the two rotating shafts (3) are respectively fixed to one end of the two connecting shafts (7), and the other ends of the two connecting shafts (7) are respectively fixed to the ends of the two rollers (2).

5. The piezoelectric power generation device based on wave energy according to claim 1, 2, 3 or 4, characterized in that: A plurality of blades (21) evenly spaced and distributed are fixed on the outer peripheral wall of the roller (2), and the blades (21) are used to contact with waves to drive the roller (2) to rotate in a circumferential direction.

6. The piezoelectric power generation device based on wave energy according to claim 5, characterized in that: The housing (1), roller (2), connecting shaft (7) and blade (21) are all made of stainless steel.

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