A wind-induced vibration wide-wind-speed omnidirectional energy harvesting device

Abstract

This invention relates to the field of power supply technology, specifically to a wind-induced vibration wide-range omnidirectional energy harvesting device. The wind-induced vibration wide-range omnidirectional energy harvesting device includes: a turntable; at least three sets of guide baffle assemblies arranged circumferentially on the turntable, each guide baffle assembly including two corresponding guide baffles to block wind flow; at least three sets of galloping piezoelectric wind energy harvesting components arranged circumferentially on the turntable, the guide baffle assemblies and the galloping piezoelectric wind energy harvesting components being arranged on the same side, each galloping piezoelectric wind energy harvesting component including a piezoelectric conversion unit; in a blowing state, the guide baffles change the wind flow direction, and the wind drives the piezoelectric conversion unit to vibrate, converting wind energy into electrical energy. This invention solves the problem of existing wind-induced vibration energy harvesting devices having a single wind harvesting direction.

Description

Technical Field

[0001] This invention relates to the field of power supply technology, specifically to a wind-induced vibration wide-speed omnidirectional energy harvesting device. Background Technology

[0002] Wind energy is an easily accessible clean energy source. Wind energy harvesting devices that convert wind energy into electricity have many advantages, such as long lifespan, maintenance-free operation, and no pollution. Using them as a battery alternative can significantly reduce maintenance costs and pollution. Overhead power line towers are equipped with sensors for monitoring tower tilt and micro-meteorological conditions. Currently, their operating power sources are mainly photovoltaic panels and wind turbines. However, photovoltaic panels are prone to dust accumulation and are difficult to adapt to rain and snow, while existing wind-driven rotating wind turbines are generally too large, making them difficult to fit with miniature sensors. In recent years, domestic and international research institutions have proposed novel wind energy harvesting technologies based on wind-induced vibration energy collection. These technologies have the advantage of easy miniaturization and can be integrated with miniature sensors. However, in practice, existing wind-induced vibration energy harvesting devices generally suffer from a single wind direction, making it difficult to adapt to changes in wind direction in the natural environment. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the wind-induced vibration energy harvesting device in the prior art that has a single wind harvesting direction, thereby providing a wind-induced vibration wide wind speed omnidirectional energy harvesting device.

[0004] To address the above problems, the present invention provides a wind-induced vibration wide-range omnidirectional energy harvesting device, comprising:

[0005] Turntable;

[0006] At least three sets of flow deflector assemblies are arranged circumferentially on the turntable. Each flow deflector assembly includes two corresponding flow deflectors, which are used to block the flow of air.

[0007] At least three sets of vibrating piezoelectric wind energy harvesting components are arranged circumferentially on the turntable. The flow guide baffle assembly is arranged on the same side as the vibrating piezoelectric wind energy harvesting components. Each vibrating piezoelectric wind energy harvesting component includes a piezoelectric conversion unit. In the blowing state, the flow guide baffle changes the flow direction of the wind, and the wind drives the piezoelectric conversion unit to vibrate to convert wind energy into electrical energy.

[0008] Optionally, the flow guide baffle assembly is disposed at equal angles along the circumference on the turntable, and the vibrating piezoelectric wind energy harvesting assembly is disposed at equal angles along the circumference on the turntable. The vibrating piezoelectric wind energy harvesting assembly is disposed between adjacent flow guide baffle assemblies. The vibrating piezoelectric wind energy harvesting assembly includes two correspondingly disposed limiting baffles, and the piezoelectric conversion unit is disposed between the limiting baffles.

[0009] Optionally, the distance between the two limiting baffles is greater than the distance between adjacent guide baffles.

[0010] Optionally, the distance from the guide baffle to the center point of the turntable is greater than the distance from the limiting baffle to the center point of the turntable.

[0011] Optionally, the flow guide baffle is arc-shaped and is used to change the direction of airflow, guiding the airflow into the space between the limiting baffle and the piezoelectric conversion unit.

[0012] Optionally, the turntable is circular and has grooves. The grooves correspond one-to-one with the flow guide baffles, and the flow guide baffles are slidably disposed in the extension direction of the grooves.

[0013] Optionally, the flow guide baffle is provided with elastic elements on both sides to abut against it, and the other end of the elastic element is fixedly connected to the side wall of the groove.

[0014] Optionally, a ball bearing is provided between the bottom of the groove and the surface of the guide baffle.

[0015] Optionally, the turntable is further provided with a central column, and the piezoelectric conversion unit further includes a piezoelectric beam, which is detachably connected to the central column.

[0016] Piezoelectric sheets are attached to both sides of the piezoelectric beam, and blunt bodies are provided at the end of the piezoelectric beam away from the central column and facing the direction of the limiting baffle.

[0017] The technical solution of this invention has the following advantages:

[0018] 1. The wind-induced vibration wide-speed omnidirectional energy harvesting device provided by the present invention includes: a turntable; at least three sets of guide baffle assemblies arranged circumferentially on the turntable, each guide baffle assembly including two corresponding guide baffles to block the flow of wind; at least three sets of vibrating piezoelectric wind energy harvesting components arranged circumferentially on the turntable, the guide baffle assemblies and the vibrating piezoelectric wind energy harvesting components being arranged on the same side, each vibrating piezoelectric wind energy harvesting component including a piezoelectric conversion unit; in the blowing state, the guide baffles change the flow direction of the wind, and the wind drives the piezoelectric conversion unit to vibrate to convert wind energy into electrical energy. By setting the guide baffle assemblies circumferentially on the turntable, and by using the guide baffles of the guide baffle assemblies to block the flow of wind, and then using the wind to drive the piezoelectric conversion unit to vibrate, the function of harvesting wind circumferentially on the turntable is realized, solving the problem of single wind harvesting direction, and adapting to winds of different directions generated by the natural environment.

[0019] 2. The wind-induced vibration wide-speed omnidirectional energy harvesting device provided by the present invention comprises a flow guide baffle assembly disposed at equal angles along the circumference of the turntable, and a vibration piezoelectric wind energy harvesting assembly disposed at equal angles along the circumference of the turntable, so as to balance the weight borne by the turntable. The vibration piezoelectric wind energy harvesting assembly is disposed between adjacent flow guide baffle assemblies, and includes two correspondingly disposed limiting baffles. The piezoelectric conversion unit is disposed between the limiting baffles, and the limiting baffles limit the vibration range of the piezoelectric conversion unit, thereby ensuring the normal operation of the piezoelectric conversion unit.

[0020] 3. The wind-induced vibration wide wind speed omnidirectional energy harvesting device provided by the present invention has a spacing between two corresponding limiting baffles that is greater than the spacing between adjacent guide baffles, so that the wind guided by the guide baffles can enter between the limiting baffles and the piezoelectric conversion unit, so that the wind drives the piezoelectric conversion unit to swing.

[0021] 4. The wind-induced vibration wide wind speed omnidirectional energy harvesting device provided by the present invention has a greater distance from the guide baffle to the center point of the turntable than the distance from the limiting baffle to the center point of the turntable, so that the guide baffle can contact the wind over a larger range, and can also avoid the piezoelectric conversion unit from colliding with the guide baffle during swing.

[0022] 5. The wind-induced vibration wide-speed omnidirectional energy harvesting device provided by the present invention has an arc-shaped guide baffle, which is used to change the flow direction of the wind and guide the wind into the space between the limiting baffle and the piezoelectric conversion unit.

[0023] 6. The wind-induced vibration wide-speed omnidirectional energy harvesting device provided by the present invention has a circular turntable with grooves on it. The grooves are arranged in a one-to-one correspondence with guide baffles. The guide baffles are slidably arranged in the extension direction of the grooves. By sliding, the guide baffles can adapt to a wider range of wind speeds. That is, when the wind speed is at a certain speed, the guide baffles and the grooves of the turntable are relatively stationary. When the wind speed changes, the guide baffles slide along the grooves due to gravity and wind speed to reach the next relatively stationary state. Thus, the present invention can adapt to a wide range of wind speeds in the natural environment, and the energy harvesting wind speed has a wider range, solving the problem of narrow energy harvesting wind speed range.

[0024] 7. The wind-induced vibration wide wind speed omnidirectional energy harvesting device provided by the present invention has elastic elements on both sides of the guide baffle that are connected and abutted to it. The other end of the elastic element is fixedly connected to the side wall of the groove. The elastic element provides elastic force for the static state of the guide baffle, so that the guide baffle is balanced by wind force, gravity and elastic force.

[0025] 8. The wind-induced vibration wide wind speed omnidirectional energy harvesting device provided by the present invention has a ball bearing between the bottom of the groove and the surface of the guide baffle. The ball bearing reduces the friction between the groove and the guide baffle, thereby ensuring that the guide baffle slides stably and reliably in the groove.

[0026] 9. The wind-induced vibration wide wind speed omnidirectional energy harvesting device provided by the present invention has a turntable with a central column, and the vibrating piezoelectric wind energy harvesting component also includes a piezoelectric beam, which is detachably connected to the central column, and the central column provides support for the installation of the piezoelectric wind energy harvesting component.

[0027] 10. The wind-induced vibration wide-speed omnidirectional energy harvesting device provided by the present invention has piezoelectric sheets attached to both sides of the piezoelectric beam. The end of the piezoelectric beam away from the central column is provided with a blunt body in the direction of the limiting baffle. When the wind speed exceeds a certain specific threshold, that is, the critical wind speed, the linear aerodynamic negative damping causes the total damping of the system to be negative. The blunt body generates a single degree of freedom divergent vibration of bending in the crosswind direction, resulting in a large and stable vibration of the blunt body. When the piezoelectric beam swings left and right and hits the limiting baffle on both sides, it has the advantages of higher output voltage and more stored energy compared with other energy harvesting devices. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the wind-induced vibration wide-speed omnidirectional energy harvesting device provided in an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the connection between the flow guide baffle and the groove provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the piezoelectric wind power harvesting component provided in the embodiments of the present invention;

[0032] Figure 4 This is a schematic diagram of a structure in which balls are arranged in a groove according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached diagram: 1. Turntable; 2. Flow guide baffle; 3. Piezoelectric beam; 4. Limiting baffle; 5. Groove; 6. Central column; 7. Elastic element; 8. Ball bearing; 9. Blunt body. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 - Figure 4 One specific embodiment of the wind-induced vibration wide-speed omnidirectional energy harvesting device shown includes: a circular turntable 1, a central column 6 arranged on the same side of the turntable 1, six sets of guide baffle assemblies, and six sets of vibration piezoelectric wind energy harvesting assemblies. Specifically, the diameter of the turntable is 120mm.

[0039] like Figure 1 As shown, a central column 6 is provided at the center point of the turntable 1. Six sets of flow guide baffle assemblies are set at equal angles along the circumference of the turntable 1. Six sets of chirping piezoelectric wind energy harvesting assemblies are set at equal angles along the circumference of the turntable 1. One chirping piezoelectric wind energy harvesting assembly is located between two adjacent flow guide baffle assemblies. The flow guide baffle assemblies and the chirping piezoelectric wind energy harvesting assemblies are set in a one-to-one correspondence.

[0040] like Figure 1 , Figure 3 As shown, each piezoelectric wind power harvesting component includes a pair of corresponding limiting baffles 4 and a piezoelectric conversion unit disposed between the limiting baffles 4. The piezoelectric conversion unit is detachably connected to the central column 6. Specifically, the piezoelectric conversion unit is plugged into the central column 6. Figure 3As shown, the piezoelectric conversion unit includes a piezoelectric beam 3. One end of the piezoelectric beam 3 is detachably connected to the central column 6, and the other end has a blunt body 9 facing the limiting baffle 4. The piezoelectric beam 3 and the blunt body 9 are bonded together with epoxy AB adhesive. Specifically, the piezoelectric beam 3 is made of 100mm thick 65Mn spring steel, with a length of 26mm and a width of 6mm. The blunt body is made of low-density foam with a cross-sectional length of 6mm, a width of 6mm, and a thickness of 2.5mm. Piezoelectric sheets are bonded to both sides of the piezoelectric beam 3 with AB adhesive. A thin metal layer is covered on the upper and lower surfaces of the piezoelectric sheets as electrodes. The piezoelectric beam 3 with double-layer piezoelectric sheets is connected in series, with the series electrodes connected together using copper foil. Positive and negative electrodes are led out from the other ends of both sides and connected to the energy storage capacitor. Specifically, the piezoelectric sheet material is lead zirconate titanate (PZT).

[0041] like Figure 1 As shown, each baffle assembly includes two corresponding baffles 2. The baffles 2 are arc-shaped and used to change the direction of airflow. The distance between the two corresponding limiting baffles 4 is greater than the distance between adjacent baffles 2. The distance from the baffle 2 to the center point of the turntable 1 is greater than the distance from the limiting baffle 4 to the center point of the turntable 1. The height of the baffle 2 is lower than the height of the limiting baffle 4. Specifically, the height of the baffle 2 is 13mm, and the height of the limiting baffle 4 is 14mm. To accommodate different wind speeds, the turntable 1 has grooves 5, each corresponding to a baffle 2. The baffle 2 slides along the extension direction of the groove 5. Figure 2 , Figure 4 As shown, elastic elements 7 are respectively provided on both sides of the flow guide baffle 2 to abut against it. The other end of the elastic element 7 is fixedly connected to the side wall of the groove 5. A ball bearing 8 is provided between the bottom of the groove 5 and the bottom surface of the flow guide baffle 2. Specifically, the elastic element 7 is a spring with an outer diameter of 10 mm, a wire diameter of 1 mm, and a shear modulus of elasticity of 7200 MPa.

[0042] In the specific implementation process, when the wind blows across the guide baffle 2, it changes the nearby flow field, disturbing the flow field and increasing the dynamic wind load on the piezoelectric beam 3. When the wind speed increases to a specified critical value (critical wind speed), the frequency of the dynamic wind load approaches the first natural frequency of the piezoelectric beam 3, causing the piezoelectric beam 3 to vibrate violently. When wind loads from different directions act on the piezoelectric beam 3 through the air inlet channel, the piezoelectric beam 3 drives the blunt body 9 mass block to swing left and right, impacting the baffles on both sides. At this time, the blunt body 9 mass block will transfer the impact force to the piezoelectric sheet. Due to the piezoelectric effect, the crystal surface of the piezoelectric sheet generates charge. The greater the applied force, the more charge is generated on the surface. When the piezoelectric sheet is subjected to a force perpendicular to the piezoelectric beam 3, a potential difference is generated on the surface of the piezoelectric sheet. After rectifying this potential difference, it can charge the capacitor. The electrical energy stored in the capacitor can power wireless sensing nodes and other electrical devices.

[0043] It should be noted that the baffle 2 in this application adjusts its position within the groove 5 according to changes in wind speed, thereby adaptively adjusting the size of the air intake channel. When the wind speed is high, the baffle 2 slides inward, forming a smaller air intake channel, thus reducing the wind load acting on the piezoelectric conversion unit and preventing the piezoelectric beam 3 from exceeding its elastic limit and breaking due to excessive wind speed, thus providing protection and support to adapt to higher wind speeds. When the wind speed is low, the baffle 2 slides outward, forming a larger air intake channel, resulting in a greater airflow convergence effect, which increases the wind load acting on the piezoelectric energy conversion unit, causing the piezoelectric beam 3 to vibrate more violently. Therefore, compared to wind energy harvesting devices without the baffle 2 or with the baffle 2 fixed, this device adapts to lower wind speeds while having a larger electrical output.

[0044] The working principle of this application utilizes galloping, a typical aeroelastic instability phenomenon with self-excitation properties. Under the action of wind, the total damping of the elastic system consists of two parts: linear damping and nonlinear damping. The former is composed of structural damping and linear aerodynamic negative damping, while the latter is nonlinear aerodynamic negative damping. When the wind speed exceeds a certain threshold (critical wind speed), the linear aerodynamic negative damping causes the total damping of the system to become negative, and the blunt body 9 generates a single-degree-of-freedom divergent vibration with crosswind bending, while the nonlinear aerodynamic negative damping causes it to produce amplitude-limited motion. The galloping piezoelectric wind energy harvesting component mainly consists of the blunt body 9 and the piezoelectric beam 3, with the blunt body 9 being the mass block at the end of the piezoelectric beam 3. Based on the characteristics of galloping, it can cause the blunt body 9 to generate large-amplitude stable vibration. When the piezoelectric beam 3 swings left and right and strikes the limiting baffles 4 on both sides, it has the advantages of high output voltage and large stored energy.

[0045] The wind-induced vibration wide-speed omnidirectional energy harvesting device provided in this application has the following advantages:

[0046] (1) The piezoelectric effect principle is used to complete the conversion of wind energy to mechanical energy and then to electrical energy. When the piezoelectric beam 3 vibrates in the resonant state, it strikes the limit baffles 4 on both sides, causing the piezoelectric sheet to deform and generate voltage. It has the advantages of simple structure and high energy conversion density.

[0047] (2) By evenly arranging three or more identical piezoelectric conversion units along the circumference of the base, wind energy from different directions can be efficiently collected, which has the advantage of good adaptability to wind direction.

[0048] (3) The baffle 2 of this application can adaptively adjust the size of the air inlet channel according to the wind speed, which expands the working wind speed range of the device and improves the service life of the piezoelectric beam 3. At the same time, the vibration amplitude of the piezoelectric beam 3 can be adjusted by the distance between the limiting baffles 4, which achieves the purpose of suppressing the deformation and damage of the piezoelectric beam 3 due to severe vibration.

[0049] As an alternative implementation, the piezoelectric beam 3 can also be made of PET material (polyterephthalic acid plastic).

[0050] As an alternative implementation, the piezoelectric element can also be made of piezoelectric materials such as polyvinylidene fluoride (PVDF) or aluminum nitride (AlN).

[0051] As an alternative implementation, the number of flow guide baffle assemblies and the Chizhen piezoelectric wind energy harvesting assemblies can be 3, 4, 5, 7 or even more.

[0052] As an alternative implementation, the elastic element 7 can also be other elastomers such as a rubber rod.

[0053] As an alternative implementation, the turntable 1, piezoelectric beam 3, flow guide baffle 2, limit baffle 4, and elastic element 7 can be designed to their respective dimensions and specifications according to the site conditions.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A wind-induced vibration wide wind speed omnidirectional power taking device, characterized in that, The utility model relates to a wind energy conversion device, including: A rotating disc (1); At least three groups of flow guide baffle assemblies are arranged circumferentially on the rotating disc (1), each flow guide baffle assembly includes two corresponding flow guide baffles (2), and the flow guide baffles (2) block the flow of wind; At least three groups of galloping piezoelectric wind energy conversion assemblies are arranged circumferentially on the rotating disc (1), the flow guide baffle assemblies and the galloping piezoelectric wind energy conversion assemblies are arranged on the same side, each galloping piezoelectric wind energy conversion assembly includes a piezoelectric conversion unit, in the blowing state, the flow guide baffles (2) change the flow direction of wind, and the piezoelectric conversion unit is driven by wind to generate vibration to convert wind energy into electric energy; The flow guide baffle assemblies are arranged at equal angles circumferentially on the rotating disc (1), the galloping piezoelectric wind energy conversion assemblies are arranged at equal angles circumferentially on the rotating disc (1), the galloping piezoelectric wind energy conversion assemblies are arranged between adjacent flow guide baffle assemblies, the galloping piezoelectric wind energy conversion assemblies include two corresponding limiting baffles (4), and the piezoelectric conversion unit is arranged between the limiting baffles (4); The distance between the two corresponding limiting baffles (4) is greater than the distance between adjacent flow guide baffles (2); The distance from the flow guide baffles (2) to the center point of the rotating disc (1) is greater than the distance from the limiting baffles (4) to the center point of the rotating disc (1); The flow guide baffles (2) are arc-shaped, the flow guide baffles (2) are used for changing the flow direction of wind and guiding wind into the space between the limiting baffles (4) and the piezoelectric conversion unit; The rotating disc (1) is circular, the rotating disc (1) is provided with grooves (5), the grooves (5) are arranged in one-to-one correspondence with the flow guide baffles (2), and the flow guide baffles (2) are arranged in the extension direction of the grooves (5) in a sliding mode; Both sides of the flow guide baffles (2) are respectively provided with elastic members (7) in abutment connection with the flow guide baffles (2), and the other end of the elastic members (7) is fixedly connected with the side wall of the groove (5); The bottom of the groove (5) and the surface of the flow guide baffles (2) are provided with balls (8); The rotating disc (1) is also provided with a center column (6), the piezoelectric conversion unit further includes a piezoelectric beam (3), and the piezoelectric beam (3) is detachably connected with the center column (6).

2. The wind-induced vibration wide wind speed omnidirectional power taking device according to claim 1, characterized in that, Piezoelectric sheets are attached to both side surfaces of the piezoelectric beam (3), and one end of the piezoelectric beam (3) away from the center column (6) is provided with blunt bodies (9) in the direction in which the limiting baffles (4) are arranged.

Images