A wind energy generation device utilizing vortex-induced vibration

Abstract

The present invention discloses a wind energy power generation device utilizing vortex-induced vibration, belonging to the technical field of wind power generation. The device includes a wind energy collection and power generation mechanism and a fixed support mechanism. The fixed support mechanism includes an outer cylinder and a support circular base. The wind energy collection and power generation mechanism includes an energy collection plate, an elastic plate, a motion conversion device, a vertical plate, a connection support, a connection plate, a gear shaft, a large gear, a driving gear, a ratchet wheel, a support plate, a piezoelectric generator, and an electromagnetic generator. The present invention utilizes wind to excite the vibration of the energy collection plate to convert wind energy into mechanical energy, and then uses electromagnetic and piezoelectric energy harvesting methods to convert mechanical energy into electrical energy. The power generation device of the present invention has the characteristics of small volume, low cost, long service life, and convenient later maintenance. Moreover, the power generation device has a short infrastructure period and a flexible installation scale.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a wind power generation device which utilizes Karman vortices to excite the vibration of an energy collecting plate. Background Art

[0002] As people's environmental awareness increases, new energy sources such as wind power and solar energy are gradually gaining attention. The current wind power generation technology mainly relies on the rotation of blades to drive the generator to generate electricity.

[0003] Blades are the most basic and critical components of blade wind turbines. Blade wind turbines need to operate continuously for a long time in harsh environments, which places high demands on the performance of blades. Blades must be light in density and have the best fatigue resistance and mechanical properties. At the same time, blade wind turbines are huge in size, occupy a large area of ​​land, affect bird flight, and have noise pollution and huge maintenance costs. Therefore, other forms of wind power generation technologies have emerged. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention discloses a wind power generation device utilizing vortex-induced vibration, which is a power generation device that collects wind energy by utilizing wind-induced vibration of an energy collection plate in combination with electromagnetic and piezoelectric energy capture methods. The wind power generation device of the present invention has a small size, low cost, long service life, and is also relatively convenient for subsequent maintenance.

[0005] The present invention is achieved in that:

[0006] A wind energy generating device utilizing vortex-induced vibration, the device comprising a wind energy collecting and generating mechanism and a fixed supporting mechanism; the fixed supporting mechanism comprising an outer cylinder and a supporting circular base; the wind energy collecting and generating mechanism comprising an energy collecting plate, an elastic plate, a motion conversion device, a vertical plate, a connecting support, a connecting plate, a gear shaft, a large gear, a driving gear, a ratchet, a supporting plate, a piezoelectric generator and an electromagnetic generator;

[0007] The bottom end of the energy collecting plate is connected to the motion conversion device, and the motion conversion device includes an upper joint, a rotating shaft, a connecting seat, and a lower swing arm from top to bottom; the upper joint is connected to the bottom end of the energy collecting plate, and the rotating shaft is located at both ends of the connecting seat; both ends of the rotating shaft are connected to the vertical plate, and the two ends of the rotating shaft extend into the axial holes of the vertical plate.

[0008] The vertical plate is supported on the connecting support; the connecting support is fixedly connected to the outer cylinder, so the motion conversion device and the energy collecting plate are also indirectly fixed on the outer cylinder; the motion conversion device can rotate around the center line of the shaft; the elastic plate passes through the central square hole of the connecting seat and is perpendicular to the axis of the rotating shaft, and is used to provide a reaction force when the energy collecting plate vibrates. A piezoelectric generator is placed on the upper and lower sides at both ends of the elastic plate. When the piezoelectric material in the piezoelectric generator is subjected to pressure, electricity is generated.

[0009] Further, the lower end of the lower swing arm of the motion conversion device is a circular arc rack, and the gear shaft is internally engaged with the circular arc rack of the lower swing arm. A large gear is connected to the left and right of the gear shaft; both sides of the gear shaft are fixed on the support plate, and the driving gear is also fixed on the support plate; the connecting plate is fixedly connected to the support plate, and the connecting plate is fixed on the connecting support through the vertical plate; the large gear is externally engaged with the driving gear, and the driving gear is coaxially connected to the ratchet wheel. The electromagnetic generator is located beside the ratchet wheel, and the electromagnetic generator is fixed on the connecting plate; the ratchet wheel is connected to the coil of the electromagnetic generator, driving the coil to rotate in the magnetic field to generate electricity.

[0010] Further, the piezoelectric generator is a generator that converts mechanical energy into electrical energy using piezoelectric materials; four piezoelectric generators are provided, which are respectively closely attached to the upper and lower sides at both ends of the elastic plate; the other side of the piezoelectric generator is fixedly connected to the connecting support.

[0011] Further, the wind energy collection and power generation mechanism is connected to the connecting support (7). The wind energy power generation mechanism is connected to the fixing mechanism through the connecting support. The connecting support is fixed to the outer cylinder by bolts; the main body of the supporting circular base is a cylinder, which increases the height of the entire device, and the bottom is connected to the ground to fix the entire device; the outer cylinder is connected to the supporting circular base, and the outer cylinder can rotate 360°, so that the direction of the energy collecting plate is always parallel to the wind direction.

[0012] The working process of the wind energy power generation device using vortex-induced vibration of the present invention is as follows:

[0013] In the wind field, when the wind blows through the energy collecting plate, due to the Karman vortex street effect, shedding vortices are formed on the energy collecting plate. When the frequency of the shedding vortices is consistent with the natural frequency of the energy collecting plate, it will induce the energy collecting plate to resonate and swing around the axis. In this way, using the principle of vortex-induced vibration, the energy collecting plate receives wind energy and converts it into mechanical energy. The energy collecting plate is connected to the motion conversion device, and the swing of the energy collecting plate is transmitted to the motion conversion device, causing the entire motion conversion device to start swinging back and forth around the center line of the shaft, and at the same time driving the lower swing arm to swing back and forth and the elastic plate to vibrate. A piezoelectric generator is placed on the upper and lower sides at both ends of the elastic plate. When the elastic plate vibrates and the piezoelectric material in the piezoelectric generators at both ends is subjected to pressure, positive and negative charges with opposite polarities appear on its two opposite surfaces, and electricity is generated.

[0014] When the energy - collecting plate vibrates, it drives the lower swing arm of the motion conversion device. The lower end of the swing arm is an arc - shaped rack, which meshes internally with the large gear shaft. A large gear is connected to each side of the large gear shaft. The large gear shaft is fixed on the support plate, and the drive gear is also fixed on the support plate. The connecting plate is fixedly connected to the support plate and is fixed on the connecting support through the vertical plate. The large gear meshes externally with the drive gear, and the drive gear is coaxially connected to the ratchet. Next to the ratchet is the electromagnetic generator. What the ratchet connects is the coil of the electromagnetic generator, driving the coil to rotate in the magnetic field to generate electricity.

[0015] The entire motion conversion device will swing back and forth around the center of the shaft due to the vortex - induced vibration of the energy - collecting plate, thus driving the lower swing arm to swing back and forth. The gear shaft meshing with the lower swing arm rotates back and forth accordingly, and the large gear also rotates, then transmitting to the drive gear and the ratchet. The ratchet drives the coil located in the magnetic field of the electromagnetic generator to rotate, and the coil cuts the magnetic induction line to generate electricity.

[0016] The main purposes of the lower swing arm and other components of the motion conversion device are: amplifying the swing amplitude to increase the coil rotation speed; converting the continuously reciprocating swing into an intermittent single - direction rotation.

[0017] First, by adjusting the transmission ratios between the swing arm and the gear shaft, the large gear and the drive gear, the rotation speed of the coil can be increased. Second, since the motion of the lower swing arm is reciprocating, the rotation of the entire mechanism is also reciprocating. Therefore, the characteristics of the ratchet are used to drive the coil of the electromagnetic generator to rotate, and two power - generating devices are set on each side (left and right) to ensure that the mechanical energy brought by the reciprocating swing of the swing arm can be collected. That is, when the swing arm swings forward, the ratchet on the left half rotates to generate electricity, while the ratchet on the right half remains stationary and does not generate electricity; when the swing arm swings backward, the ratchet on the left half remains stationary and does not generate electricity, while the ratchet on the right half rotates to generate electricity. In this way, the continuously reciprocating swing is converted into an intermittent single - direction rotation.

[0018] The device of the wind - energy collection and power - generation part is connected to the connecting support, and the connecting support is fixed on the outer cylinder through bolts. The supporting circular base body is a cylinder, which raises the height of the entire device, and the bottom is connected to the ground to fix the entire device. The cylinder is connected to the supporting circular base, and it can rotate 360°, making the direction of the energy - collecting plate always parallel to the wind direction, collecting wind energy for power generation and improving the utilization rate of wind energy.

[0019] The beneficial effects of the present invention compared with the prior art are as follows:

[0020] The present invention is a wind energy power generation device utilizing vortex-induced vibration. This power generation device converts wind energy into mechanical energy by exciting the vibration of an energy-collecting plate by wind, and then converts the mechanical energy into electrical energy using electromagnetic and piezoelectric energy harvesting methods. The power generation device of the present invention has the characteristics of being relatively small in volume, low in cost, long in service life, and relatively convenient for later maintenance. Moreover, this power generation device has a short infrastructure cycle and a flexible installed capacity scale.

[0021] The power generation device of the present invention is small in volume, will not occupy too much land resources, and will not affect the activities of birds. The manufacturing cost and later maintenance cost of the power generation device of the present invention are low, and the construction time is shortened a lot, the installed capacity scale is more flexible, and the service life is extended. The power generation device of the present invention can be used in remote and inaccessible places to supply power to small-power electrical appliances and instruments. Brief Description of the Drawings

[0022] Figure 1 is the overall appearance of a wind energy power generation device utilizing vortex-induced vibration according to the present invention; 1(a) is the front view of the device of the present invention; 1(b) is a schematic diagram of the shedding of von Kármán vortices in a wind field;

[0023] Figure 2 is a schematic diagram of the positional relationship among an elastic plate, a motion conversion device, and a piezoelectric generator in a wind energy power generation device utilizing vortex-induced vibration according to the present invention;

[0024] Figure 3 is a schematic diagram of an electromagnetic power generation mechanism in a wind energy power generation device utilizing vortex-induced vibration according to the present invention; 3(a) is the front view of the electromagnetic power generation mechanism in the present invention; 3(b) is a schematic diagram of the meshing relationship between the large pendulum wheel and the gear shaft of the electromagnetic power generation mechanism in the present invention; 3(c) is a schematic diagram of the ratchet of the electromagnetic power generation mechanism in the present invention.

[0025] Among them, 1 - energy-collecting plate, 2 - outer cylinder, 3 - supporting circular base, 4 - motion conversion device, 4.1 - upper joint, 4.2 - rotating shaft, 4.3 - connecting seat, 4.4 - lower swing arm, 5 - elastic plate, 6 - piezoelectric generator, 7 - connecting support, 8 - vertical plate, 9 - connecting plate, 10 - ratchet, 11 - driving gear, 12 - support plate, 13 - gear shaft, 14 - large gear, 15 - coil of the electromagnetic generator. Detailed Embodiments

[0026] To make the purpose, technical solutions, and effects of the present invention clearer and more definite, the following examples are listed to further elaborate on the present invention in detail. It should be noted that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] As Figures 1 to 3As shown in the figure, the device of the present invention includes a wind energy collection and power generation mechanism and a fixed support mechanism; the fixed support mechanism includes an outer cylinder 2 and a support circular base 3; the wind energy collection and power generation mechanism includes an energy collection plate 1, an elastic plate 5, a motion conversion device 4, a vertical plate 8, a connection support 7, a connection plate 9, a gear shaft 13, a large gear 14, a driving gear 11, a ratchet 10, a support plate 12, a piezoelectric generator 6 and an electromagnetic generator.

[0028] The bottom end of the energy collection plate 1 is connected to the motion conversion device 4. The motion conversion device 4 includes, from top to bottom, an upper joint 4.1, a rotating shaft 4.2, a connection seat 4.3, and a lower swing arm 4.4. The upper joint 4.1 is connected to the bottom end of the energy collection plate 1. The rotating shaft 4.2 is located at both ends of the connection seat 4.3. Both ends of the rotating shaft 4.2 are connected to the vertical plate 8, and both ends of the rotating shaft 4.2 extend into the shaft holes of the vertical plate 8. The vertical plate 8 is supported on the connection support 7. The connection support 7 is fixedly connected to the outer cylinder 2, and the motion conversion device 4 and the energy collection plate 1 are indirectly fixed on the outer cylinder 2. The motion conversion device 4 can rotate around the center line of the shaft. The elastic plate 5 passes through the central square hole of the connection seat 4.3 and is perpendicular to the axis of the rotating shaft 4.2, and is used to provide a reaction force when the energy collection plate 1 vibrates. Piezoelectric generators 6 are placed on the upper and lower sides at both ends thereof.

[0029] The lower end of the lower swing arm 4.4 of the motion conversion device 4 is a circular arc rack. The gear shaft 13 is internally meshed with the circular arc rack of the lower swing arm 4.4. A large gear 14 is connected to the left and right of the gear shaft 13. The gear shaft 13 is fixed to the support plate 12 on both sides, and the driving gear 11 is also fixed to the support plate. The connection plate 9 is fixedly connected to the support plate 12, and the connection plate 9 is fixed to the connection support 7 through the vertical plate 8. The large gear 14 is externally meshed with the driving gear 11. The driving gear 11 is coaxially connected to the ratchet 10. The electromagnetic generator is located beside the ratchet 10, and the electromagnetic generator is fixed to the connection plate 9. The ratchet 10 is connected to the coil 15 of the electromagnetic generator, driving the coil to rotate in the magnetic field to generate electricity in this way.

[0030] The technical solutions in the embodiments of the present invention will be further described in detail below with reference to the drawings and data.

[0031] Place the power generation device of the present invention in a place with constant wind all year round. No matter which direction the wind blows from, the power generation device can rotate through the support circular base at the bottom, making the energy collection plate parallel to the wind direction, so as to better make the energy collection plate undergo vortex-induced vibration.

[0032] The average wind speed in a certain place is 4.8 m / s. According to the empirical formula for the shedding frequency of Karman vortices (where V is the wind speed, d is the thickness of the energy collection plate, and Sr is the Strouhal number, which is a constant when the Reynolds number is greater than 1000, and Sr = 0.21). The initial design of the thickness of the energy collection plate is 60 mm, and the shedding frequency of the Karman vortex of the energy collection plate in the wind field can be obtained to be approximately 16.8 Hz. Then, an energy collection plate is designed such that the second-order bending frequency of the energy collection plate is approximately equal to the shedding frequency of the Karman vortex. When the bending frequency of the energy collection plate is equivalent to the shedding frequency of the Karman vortex, the energy collection plate is prone to resonance and generates vortex-induced vibration.

[0033] The entire motion conversion device starts to swing back and forth around the center line of the shaft, simultaneously driving the swing arm at the lower part of the motion conversion device to swing back and forth and the elastic plate at the shaft center to vibrate. The vibration of the elastic plate generates pressure at the end of the elastic plate, pressing on the piezoelectric generator (as Figure 2 shown). The piezoelectric generator is subjected to the pressure of the elastic plate, and positive and negative charges with opposite polarities appear on its two opposite surfaces due to the pressure, thereby generating electricity.

[0034] The back-and-forth rotation of the motion conversion device drives the swing arm to swing back and forth (as Figure 3 (a)), the swing angle of the swing arm is ±10°, and the arm length is 250 mm. The radius of the gear that meshes internally with the swing arm is 100 mm, and it rotates back and forth by 50° along with the back-and-forth swing of the swing arm (as Figure 3 (b)), and the large gears on both sides of the gear shaft also rotate back and forth by 50°. The driving gear meshes externally with the large gear and is coaxial with the external ratchet (as Figure 3 (c)). The radius of the large gear is 200 mm, and the radius of the driving gear is 40 mm. Therefore, the driving gear rotates back and forth by 250°, and the ratchet can rotate by 250° accordingly. The coil of the electromagnetic generator connected to the ratchet starts to rotate and cuts the magnetic induction lines in the magnetic field to generate electricity.

[0035] For the power generation device of the present invention, first, the energy collection plate utilizes the Karman vortex street effect to convert wind energy into mechanical energy, then uses piezoelectric and electromagnetic energy harvesting methods to convert mechanical energy into electrical energy, and combined with the rotation of the support round seat at the bottom of the device with the wind direction, efficient collection of wind energy is achieved.

[0036] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements can be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. A wind energy power generation device utilizing vortex-induced vibration, characterized in that, The described device includes a wind energy collection and power generation mechanism and a fixed support mechanism; the fixed support mechanism includes an outer cylinder (2) and a support circular base (3); The wind energy collection and power generation mechanism includes an energy collection plate (1), an elastic plate (5), a motion conversion device (4), a vertical plate (8), a connection support (7), a connection plate (9), a gear shaft (13), a large gear (14), a driving gear (11), a ratchet (10), a support plate (12), a piezoelectric generator (6), and an electromagnetic generator; The bottom end of the energy collection plate (1) is connected to the motion conversion device (4). The motion conversion device (4) successively includes an upper joint (4.1), a rotating shaft (4.2), a connection seat (4.3), and a lower swing arm (4.4) from top to bottom. The upper joint (4.1) is connected to the bottom end of the energy collection plate (1). The rotating shaft (4.2) is located at both ends of the connection seat (4.3). Both ends of the rotating shaft (4.2) are connected to the vertical plate (8), and both ends of the rotating shaft (4.2) extend into the shaft holes of the vertical plate (8); The vertical plate (8) is supported on the connection support (7). The connection support (7) is fixedly connected to the outer cylinder (2). The motion conversion device (4) and the energy collection plate (1) are indirectly fixed on the outer cylinder (2). The motion conversion device (4) can rotate around the center line of the shaft; The elastic plate (5) passes through the central square hole of the connection seat (4.3) and is perpendicular to the axis of the rotating shaft (4.2), and is used to provide a reaction force when the energy collection plate (1) vibrates. A piezoelectric generator (6) is placed on each of the upper and lower sides at both ends of the elastic plate. The piezoelectric material in the piezoelectric generator generates electricity when it is under pressure.

2. The wind energy power generation device utilizing vortex-induced vibration according to claim 1, characterized in that, The lower end of the lower swing arm (4.4) of the motion conversion device (4) is an arc-shaped rack. The gear shaft (13) is internally engaged with the arc-shaped rack of the lower swing arm (4.4). A large gear (14) is connected to the left and right of the gear shaft (13). The gear shaft (13) is fixed to the support plate (12) on both sides. The driving gear (11) is also fixed to the support plate. The connection plate (9) is fixedly connected to the support plate (12), and the connection plate (9) is fixed to the connection support (7) through the vertical plate (8); The large gear (14) is externally engaged with the driving gear (11). The driving gear (11) is coaxially connected to the ratchet (10). The electromagnetic generator is located beside the ratchet (10). The electromagnetic generator is fixed to the connection plate (9). The ratchet (10) is connected to the coil (15) of the electromagnetic generator and drives the coil to rotate in the magnetic field to generate electricity in this way.

3. The wind energy power generation device utilizing vortex-induced vibration according to claim 1, characterized in that, The piezoelectric generator (6) is a generator that converts mechanical energy into electrical energy using piezoelectric materials. Four piezoelectric generators (6) are provided, which are respectively closely attached to the upper and lower sides at both ends of the elastic plate. The other side of the piezoelectric generator is fixedly connected to the connection support (7).

4. The wind energy power generation device utilizing vortex-induced vibration according to claim 1, characterized in that, The described wind energy collection and power generation mechanism is connected to the connecting support (7), and the connecting support is fixed to the outer cylinder (2) by bolts; the support circular base body is a cylinder, which increases the height of the entire device and is connected to the ground at the bottom to fix the entire device; the outer cylinder (2) is connected to the support circular base (3), and the outer cylinder (2) can rotate 360°, so that the direction of the energy collection plate (1) is always parallel to the wind direction.

5. A wind energy power generation device utilizing vortex-induced vibration as claimed in claim 1, characterized in that, The working process of the described device is as follows: In the wind field, when the wind blows over the energy collection plate (1), due to the Karman vortex street effect, shedding vortices are formed on the energy collection plate (1). When the frequency of the shedding vortices is consistent with the natural frequency of the energy collection plate (1), it will induce the energy collection plate (1) to resonate and swing around its axis; the energy collection plate (1) receives wind energy and converts it into mechanical energy. The energy collection plate (1) is connected to the motion conversion device (4), and the swing of the energy collection plate (1) is transmitted to the motion conversion device (4), causing the entire motion conversion device to start swinging back and forth around the center line of the axis, and at the same time driving the lower swing arm (4.4) to swing back and forth and the elastic plate (5) to vibrate. When the elastic plate (5) vibrates, when the piezoelectric materials in the piezoelectric generators at both ends are subjected to pressure, opposite charges appear on its two opposite surfaces, generating electricity.

6. The wind energy power generation device utilizing vortex-induced vibration according to claim 5, characterized in that, The described motion conversion device (4) swings back and forth around the center of the axis due to the vortex-induced vibration of the energy collection plate, thereby driving the lower swing arm (4.4) to swing back and forth; the gear shaft (13) engaged with the lower swing arm (4.4) rotates back and forth accordingly, and the large gear (14) also rotates, and then it is transmitted to the driving gear (11) and the ratchet (10); the ratchet (10) drives the coil (15) located in the magnetic field in the electromagnetic generator to rotate, and the coil cuts the magnetic induction line to generate electricity.

7. The wind energy power generation device utilizing vortex-induced vibration according to claim 6, characterized in that, The movement of the lower swing arm (4.4) is reciprocating, and thus the rotation of the entire wind energy collection and power generation mechanism is also reciprocating. The ratchet (10) is used to drive the rotation of the coil of the electromagnetic generator, and two power generation devices are provided on each of the left and right sides to ensure that the mechanical energy brought by the reciprocating swing of the lower swing arm (4.4) can be collected. When the lower swing arm (4.4) swings forward, the ratchet on the left half rotates and can generate electricity, while the ratchet on the right half remains stationary and does not generate electricity; when the lower swing arm (4.4) swings backward, the ratchet on the left half remains stationary and does not generate electricity, while the ratchet on the right half rotates and generates electricity; in this way, the continuously reciprocating swing is converted into an intermittent single-direction rotation.

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