Automatic frequency regulation device for wind-induced vortex-induced vibration generator and method of use

Abstract

The present invention discloses an automatic frequency regulation device for a wind-induced vortex-induced vibration generator and a method for using the device. It includes an energy capture device and a fixed support system; it also includes an energy conversion system, a control system, and a reset system; the energy conversion system converts the gravitational potential energy of the weight into the mechanical energy of the automatic frequency regulation device, thereby enabling the automatic frequency regulation device to operate; the control system converts the mechanical energy into kinetic energy, and adjusts the center of mass position of the energy capture device by controlling the ventilation rate; the reset system plays a reset support role for the entire automatic frequency regulation device. When the pressure difference between the upper and lower ends of the energy capture device decreases, the reset system gives it a restoring force, thereby causing the automatic frequency regulation device to gradually return to its initial position. The device of the present invention has a simple structure, low production and maintenance costs, and can automatically adjust its own structure according to the size and direction of the incoming flow velocity, thereby changing the natural frequency of the device, widening the energy capture range of the energy capture device, and greatly improving the utilization rate of wind energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to an automatic frequency regulation device for a wind-induced vortex-induced vibration generator and a use method thereof. Background Art

[0002] When fluid flows through a bluff body at a constant velocity, alternating vortices are generated downstream of the bluff body. These alternating vortices cause the bluff body to vibrate perpendicular to the incoming flow, a phenomenon known as vortex-induced vibration (VIV). When the vortex shedding frequency approaches the bluff body's natural frequency, VIR (Vortex-Induced Resonance) occurs, often damaging the bluff body structure. Many researchers have extensively discussed how to avoid VIR in areas such as long-span bridges and deep-sea oil exploration. However, wind-induced VIR generators utilize this principle to convert wind energy into other forms of energy. These generators primarily consist of an energy capture device, an energy transfer device, and an energy conversion device.

[0003] The energy capture device of the wind-induced vortex-induced vibration generator uses the principle of vortex-induced vibration to capture wind energy. When the vortex-induced resonance state is reached, the swing amplitude of the energy capture device is the largest, and the wind energy conversion efficiency is the highest at this time. However, the structure of the existing wind-induced vortex-induced vibration generator is fixed, so its natural frequency is a fixed value, resulting in a narrow available wind speed range and low wind energy utilization rate. It can be seen from the conditions for the formation of vortex-induced resonance that there are two ways to put the energy capture device in the vortex-induced resonance state. One is to make the vortex shedding frequency match the natural frequency of the wind-induced vortex-induced vibration generator, and the other is to fit the natural frequency of the wind-induced vortex-induced vibration generator to the vortex shedding frequency. The direction and speed of wind in nature are relatively chaotic and uncontrolled, so the only way to widen the wind energy utilization range is to change the natural frequency. In the paper "Study on the Influence of Counterweight on Widening the Energy Capture Range of Bladeless Wind Turbines" in the Journal of Mechanical Engineering, 2022 (58), Gong Shuguang, Wang Xiang et al. proposed a new idea of ​​adding counterweight blocks to the energy capture column, and verified that the natural frequency of the wind-induced vortex-induced vibration generator is closely related to its center of mass position. The lower the center of mass position, the greater the natural frequency, and the higher the center of mass position, the smaller the natural frequency. However, the invention does not specifically design and implement such a device. Summary of the Invention

[0004] Based on the above background technology, the first objective of the present invention is to provide an automatic frequency regulation device for a wind-induced vortex-induced vibration generator. This device can flexibly adjust its structure based on the magnitude and direction of the incoming flow velocity, thereby automatically adjusting the natural frequency of the wind-induced vortex-induced vibration generator, broadening the energy capture range of the energy capture device and increasing wind energy utilization.

[0005] The first object of the present invention is achieved through the following technical solutions:

[0006] The automatic frequency regulation device for a wind-induced vortex-induced vibration generator includes an energy capture device, a fixed support system, an energy conversion system, a control system, and a reset system. The energy capture device includes an energy capture column housing, a bottom cover fixedly mounted at the lower end of the energy capture column housing, and a mast fixedly mounted on the central axis of the energy capture column housing. The fixed support system includes a generator housing and a base fixed to the generator housing. The lower end of the mast is rotatably mounted within the internal structure of the generator housing via a rotating ball.

[0007] The energy conversion system includes a sleeve mounted on the upper portion of the mast, which can slide up and down and rotate on the mast, and the sleeve coincides with the center line of the mast; a sleeve connecting rod I and a sleeve connecting rod II, whose axes are parallel to each other, are fixedly connected in the same vertical plane on the same vertical line on the surface of the sleeve, and the sleeve connecting rod I and the sleeve connecting rod II are respectively connected to the center of the escapement wheel and the escapement fork through a limit rod II and a limit rod III; a weight block is fixedly connected to the lower end extension line of the escapement fork center line through a connecting rod, and the escapement fork and the escapement wheel are matched through a tooth groove; a cam-shaped push wheel is fixedly connected to the outer side of the escapement wheel, and the push wheel center line is parallel to the escapement wheel center line;

[0008] The control system includes an air plug rod and an air pump device, and the push wheel slides on the upward extension line of the center line of the air plug rod to constrain the air plug rod; the reset system includes a rotating reset plate, which is elastically connected to the control system through four vertical springs;

[0009] The energy conversion system operates by converting the gravitational potential energy of the weight into mechanical energy of the generator automatic frequency regulation device; the control system abuts against the driving wheel of the energy conversion system through the air plug rod, converts the mechanical energy into kinetic energy, and adjusts the center of mass position of the energy capture device by controlling the ventilation rate; the reset system is elastically connected to the control system, and plays a reset support role for the entire generator automatic frequency regulation device. When the pressure difference between the upper and lower surfaces of the air pump device decreases, the restoring force of the reset system is greater than the pressure difference, thereby causing the generator automatic frequency regulation device to gradually return to its initial position.

[0010] Specifically, the air pump device includes an air pump barrel, an air pump lower cover, and an air pump upper cover; after the air plug rod slides through the center of the air pump lower cover of the air pump barrel, its top end is fixedly connected to the air plug; the outer wall diameter of the air pump barrel is smaller than the inner wall radius of the energy capture column shell, the air pump lower cover is fixedly connected to the bottom of the air pump barrel, the air pump upper cover is sealed and fixedly connected to the top of the air pump barrel, and the air pump upper cover is slidably connected to the inner wall of the energy capture column shell; the bottom center of the air pump upper cover is fixedly connected to the top of the sleeve; the air pump upper cover is provided with three air holes, a pressure relief hole and a U-shaped air guide tube, wherein , air hole one and air hole two are located on the same radial direction on the air pump cover, and air hole three is located on another radial direction on the air pump cover; air hole one and air hole two are also located on the top of the air pump barrel and are respectively provided with air nozzle I and air nozzle II; the U-shaped air guide tube is installed on the upper surface of the air pump cover, one end of which is installed above air hole two, and the other end of the U-shaped air guide tube is installed above air hole three, and no air nozzle is installed in air hole three; the air nozzle I can only discharge the gas in the air pump barrel to the outside of the air pump barrel, and the air nozzle II can only transmit the gas outside the air pump barrel to the air pump barrel.

[0011] Specifically, the rotation reset plate is rotationally connected to the mast through the limit rod I at the top of the mast, and the rotation reset plate is slidingly connected to the inner wall of the energy capture column shell; the mast passes through the center of the air pump cover and is slidingly connected thereto.

[0012] Specifically, the air plug rod is in clearance fit with the air pump lower cover of the air pump barrel; the air plug is in sliding fit with the inner wall of the air pump barrel, and a rubber gasket is installed in the middle to ensure its air tightness.

[0013] Specifically, the mast slides with the center of the air pump cover, a rubber gasket is installed in the middle to ensure its airtightness, and lubricating oil is applied to ensure that they can slide relative to each other; the air pump cover slides with the inner wall of the energy capture column shell, and a rubber gasket is installed in the middle to ensure its airtightness.

[0014] A second object of the present invention is to provide a method for using the above-mentioned automatic frequency regulation device for a wind-induced vortex-induced vibration generator, which is applicable to the following actual working conditions:

[0015] Working condition 1: When the wind of a certain speed blows the energy capture device, the energy capture device swings periodically in the direction perpendicular to the incoming flow; since the weight is only affected by gravity and the tension along the connecting rod, when the energy capture device swings, the gravity of the weight will form an angle with the center line of the energy capture device, thereby driving the weight to do a simple pendulum motion; the moving weight drives the escapement structure to operate, making the escapement wheel rotate stably, and further making the air exchange rate of the air pump structure tend to be stable; the air exchange of the air pump structure causes a pressure difference on the upper cover of the air pump , pressure difference Push the upper cover of the air pump and the device below it to move downward, and at the same time the pressure difference The pressure relief hole will be ventilated until the ventilation rate of the pressure relief hole is consistent with the ventilation rate of the air pump structure. At this time, the automatic frequency regulation device stays at a certain height and operates stably.

[0016] Working condition 2 based on working condition 1: When the incoming flow velocity increases, the vortex-induced vibration frequency of the energy capture device increases, the swing frequency of the weight accelerates, the escapement wheel accelerates, and the air exchange rate of the air pump structure accelerates; assuming that the position of the air pump cover remains unchanged, the pressure difference between the upper and lower surfaces of the air pump cover due to the accelerated air exchange rate of the air pump structure If the pressure increases, the structure becomes unstable, which is inconsistent with the assumption. The air pump cover and the structure below it move downward, and the ventilation rate of the pressure relief hole increases until the air pump cover reaches the next stable state. Since part of the structure moves downward, the center of mass of the entire device moves downward, thereby increasing the natural frequency of the wind-induced vortex-induced vibration generator.

[0017] Working condition 3 based on working condition 1: When the incoming flow velocity decreases, the vortex-induced vibration frequency of the energy capture device decreases, the swing frequency of the weight slows down, the escapement wheel slows down, and the ventilation rate of the air pump structure slows down; assuming that the position of the air pump cover remains unchanged, the pressure difference between the upper and lower surfaces of the air pump cover due to the slow ventilation rate of the air pump structure If the pressure decreases, the structure becomes unstable, which is inconsistent with the assumption. The air pump cover and the structure below it move upward, and the ventilation rate of the pressure relief hole slows down until the air pump cover reaches the next stable state. Since part of the structure moves upward, the center of mass of the entire device moves upward, thereby reducing the natural frequency of the wind-induced vortex-induced vibration generator.

[0018] Working condition 4 based on working condition 1: When the direction of the incoming wind changes, the energy capture device will experience a short period of instability. Assuming that the impact on the energy capture device shell during this period is negligible, it can be considered that the swing direction of the energy capture device is always perpendicular to the incoming flow direction. At this time, the swing direction of the weight in the automatic frequency regulation device has a certain angle with the incoming flow direction, but due to gravity and inertia, the weight will drive the entire device to swing in a partial circle centered on the swing center of the energy capture device, and gradually recover until it stabilizes.

[0019] The working principle of the present invention is as follows:

[0020] The weight, connecting rod, escapement fork and escapement wheel in the device of the present invention constitute an escapement mechanism; the escapement wheel is fixedly connected to the driving wheel, so that the driving wheel and the escapement mechanism have the same rotation rate; the escapement fork, weight and connecting rod form a fixed structure, and the escapement mechanism is driven to work by the inertia force and gravity of the weight; the incoming flow passes through the energy capture device to capture wind energy to generate vortex-induced vibration, and the energy capture device swings left and right to drive the weight to swing, and the weight drives the escapement fork to swing left and right through the connecting rod, thereby causing the escapement wheel to rotate; that is, the swing frequency of the energy capture device directly affects the rotation rate of the escapement mechanism.

[0021] The air pump structure of the present invention is comprised of an air pump lower cover, an air pump barrel, an air plug, air nozzles I and II, an air pump upper cover, and an air guide tube. The air plug's reciprocating motion up and down drives air extraction and inhalation. Specifically, when the air plug moves downward, air nozzle I closes and air nozzle II opens, allowing the air pump barrel to extract air from below the energy capture device. When the air plug moves upward, air nozzle I opens and air nozzle II closes, allowing the air plug to push air from the air pump barrel to above the energy capture device. The rotation of the escape wheel is equivalent to the rotation of the push wheel, which pushes the air plug rod up and down, resulting in the escape wheel's rotational frequency being consistent with the air exchange frequency of the air pump mechanism.

[0022] The pressure relief hole in the device of the present invention is located on the air pump cover. When the incoming air velocity decreases, the air pump structure's ventilation rate slows, and the pressure differential decreases, causing the pressure relief hole's ventilation rate to decrease. Simultaneously, the spring force is greater than the combined force of the pressure differential and gravity, causing the air pump cover to become unstable. The air pump cover and the underlying device move upward, shifting the center of mass upward. Therefore, the reset system acts as a restorative support within the entire device.

[0023] The realization principle of the automatic frequency regulation of the wind-induced vortex-induced vibration generator of the present invention is: assuming the mass of the air pump cover and the device below is ; The pressure at the top of the energy capture device is ; The air pressure at the lower end of the energy capture device is ; The spring force is, , is the elastic constant of the spring, is the displacement of the air pump cover; the upper and lower surface areas of the air pump cover are ;The pressure on the upper surface of the air pump cover is, ; The pressure on the lower surface of the air pump cover is, ; The net force on the air pump cover in addition to the pressure is, , is the local acceleration of gravity; the ventilation rate of the pressure relief hole is ;The pressure difference between the upper and lower surfaces of the air pump cover is .

[0024] When the entire device is in a stable state, the force on the air pump cover is balanced At this time, the air exchange rate of the air pump and the air exchange rate of the pressure relief hole same, . Air exchange rate of pressure relief hole The pressure difference between the upper and lower surfaces of the air pump cover is Proportional, , is the ventilation coefficient. That is, when stable, the ventilation rate of the pressure relief hole is proportional to the displacement of the air pump cover and the device below it. .

[0025] When the incoming flow velocity increases, the vortex-induced vibration frequency of the energy capture device increases, the swing frequency of the weight accelerates, the escapement wheel accelerates, and the air exchange rate of the air pump structure accelerates. Assuming that the position of the air pump cover remains unchanged, the pressure difference between the upper and lower surfaces of the air pump cover due to the accelerated air exchange rate of the air pump structure If the pressure increases, the structure becomes unstable, which contradicts the assumption. The air pump cover and the structure below it move downward, and the ventilation rate of the pressure relief hole increases until the air pump cover reaches the next stable state. The downward movement of part of the structure causes the center of mass of the entire device to move downward, thereby increasing the natural frequency of the wind-induced vortex vibration generator.

[0026] When the incoming flow velocity decreases, the vortex-induced vibration frequency of the energy capture device decreases, the swing frequency of the weight slows down, the escapement wheel slows down, and the air exchange rate of the air pump structure slows down. Assuming that the position of the air pump cover remains unchanged, the pressure difference between the upper and lower surfaces of the air pump cover due to the slow air exchange rate of the air pump structure If the pressure decreases, the structure becomes unstable, which contradicts the assumption. The air pump cover and the structure below it move upward, and the ventilation rate of the pressure relief hole slows down until the air pump cover reaches the next stable state. Because part of the structure moves upward, the center of mass of the entire device moves upward, thereby reducing the natural frequency of the wind-induced vortex vibration generator.

[0027] The present invention improves a fixed-structure wind-induced vortex-induced vibration generator into one that automatically adjusts according to the magnitude and direction of incoming flow velocity. This means the generator's natural frequency can be adjusted based on wind speed. This invention offers a simple structure, low production and maintenance costs, and eliminates the need for an additional controller. It also broadens the range of wind energy utilization and increases wind energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the internal structure of the device of the present invention.

[0029] Figure 2 for Figure 1 Schematic diagram of the installation of the air pump cover.

[0030] Figure 3 for Figure 1 Schematic diagram of the air pump mechanism installation.

[0031] Figure 4 for Figure 1 Schematic diagram of the installation of the escapement mechanism.

[0032] Figure 5 for Figure 1 Schematic diagram of the top of the midmast.

[0033] Figure 6 for Figure 1 Schematic diagram of force analysis of the upper cover of the air pump.

[0034] Figure 7 for Figure 1 A partial schematic diagram of the connection between the middle sleeve and the escapement mechanism.

[0035] Figure 8 Schematic diagram of the movement of the energy capture device in the device of the present invention.

[0036] Figure 9 This is a working diagram of the automatic frequency regulation device of the present invention when the wind speed is changed.

[0037] Figure 10 This is a working diagram of the automatic frequency modulation device of the present invention when the wind direction changes. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0039] See also Figures 1 to 7 The automatic frequency regulation device for a wind-induced vortex-induced vibration generator according to an embodiment of the present invention includes an energy capture device, a fixed support system, an energy conversion system, a control system, and a reset system. The energy capture device includes an energy capture column housing 10, an energy capture column bottom cover 13 fixedly mounted at the lower end of the energy capture column housing 10, and a mast 9 fixedly mounted on the central axis of the energy capture column housing 10. The fixed support system includes a generator housing 11 and a base 12 fixed to the generator housing 11. The lower end of the mast 9 is rotatably mounted within the internal structure of the generator housing 11 via a rotating ball.

[0040] like Figure 1 、 Figure 4 、 Figure 5 、 Figure 7 As shown, the energy conversion system includes a sleeve 4 mounted on the upper part of the mast 9, which can slide up and down and rotate on the mast 9, and the center line of the sleeve 4 coincides with the center line of the mast 9; a sleeve connecting rod I 23 and a sleeve connecting rod II 24 with parallel axes are fixedly connected in the same vertical plane of the same vertical line on the surface of the sleeve 4, and the sleeve connecting rod I 23 and the sleeve connecting rod II 24 are respectively connected to the center rotation of the escapement wheel 5 and the escapement fork 6 through the limit rod II 27 and the limit rod III 26; a weight block 8 is fixedly connected to the lower end extension line of the center line of the escapement fork 6 through the connecting rod 7, and the escapement fork 6 and the escapement wheel 5 are matched through the tooth groove; a cam-shaped push wheel 14 is fixedly connected to the outside of the escapement wheel 5, and the center line of the push wheel 14 is parallel to the center line of the escapement wheel 5; the escapement fork 6 drives the escapement wheel 5 to rotate, which is equivalent to driving the push wheel 14 to work.

[0041] like Figure 1 、 Figure 2 、 Figure 3As shown, the control system includes an air plug rod 15 and an air pump device, and the push wheel 14 slides on the upward extension line of its center line to constrain the air plug rod 15; the reset system includes a rotating reset plate 1, which is elastically connected to the control system through four vertical springs 18.

[0042] The energy conversion system operates by converting the gravitational potential energy of the weight 8 into mechanical energy of the generator automatic frequency regulation device; the control system abuts against the push wheel 14 of the energy conversion system through the air plug rod 15, converts the mechanical energy into kinetic energy, and adjusts the center of mass position of the energy capture device by controlling the ventilation rate; the reset system is elastically connected to the control system, and plays a reset support role for the entire generator automatic frequency regulation device. When the pressure difference between the upper and lower surfaces of the air pump device decreases, the restoring force of the reset system is greater than the pressure difference, so that the generator automatic frequency regulation device gradually returns to its initial position.

[0043] like Figure 1 、 Figure 2 、 Figure 3 As shown, the air pump device includes an air pump barrel 3, an air pump lower cover 21, and an air pump upper cover 2; after the air plug rod 15 slides through the center of the air pump lower cover 21 of the air pump barrel 3, its top end is fixedly connected to the air plug 22; the outer wall diameter of the air pump barrel 3 is smaller than the inner wall radius of the energy capture column shell 10, the air pump lower cover 21 is fixedly connected to the bottom of the air pump barrel 3, and the top of the air pump barrel 3 is sealed and fixedly connected with the air pump upper cover 2, and the air pump upper cover 2 is slidably connected to the inner wall of the energy capture column shell 10; the bottom center of the air pump upper cover 2 is fixedly connected to the top of the sleeve 4; the air pump upper cover 2 is provided with three air holes, a pressure relief hole 19 and a U-shaped air guide tube 17, among which the air hole 1 and the air hole 2 are located at the air pump In the same radial direction on the upper cover 2, air hole three is located in another radial direction on the air pump upper cover 2; air hole one and air hole two are also located on the upper side of the air pump barrel 3 and are respectively provided with an air nozzle I 16 and an air nozzle II 20; a U-shaped air guide tube 17 is installed on the upper surface of the air pump upper cover 2, one end of which is installed above air hole two, and the other end of the U-shaped air guide tube 17 is installed above air hole three, and no air nozzle is installed in air hole three; the air nozzle I 16 can only discharge the gas in the air pump barrel 3 to the outside of the air pump barrel 3, and the air nozzle II 20 can only transmit the gas outside the air pump barrel 3 to the air pump barrel 3, and the air guide tube 17 is mainly used to transmit the gas at the lower end of the energy capture device to the air pump mechanism.

[0044] like Figure 1 、 Figure 2 、 Figure 3 As shown, the rotary reset plate 1 is rotatably connected to the mast 9 through the limit rod Ⅰ25 at the top of the mast 9, and the rotary reset plate 1 is slidably connected to the inner wall of the energy capture column shell 10; the mast 9 passes through the center of the air pump upper cover 2 and is slidably connected thereto; when the automatic frequency regulation mechanism is operating stably, the pressure relief hole 19 has the same ventilation rate as the air pump device.

[0045] In this embodiment, the air plug rod 15 is clearance-matched with the air pump lower cover 21 of the air pump barrel 3; the air plug 22 is slidingly matched with the inner wall of the air pump barrel 3, and a rubber gasket is installed in the middle to ensure its air tightness.

[0046] In this embodiment, the mast 9 is slidably fitted with the center of the air pump cover 2, a rubber gasket is installed in the middle to ensure its airtightness, and lubricating oil is applied to ensure that they can slide relative to each other; the air pump cover 2 is slidably fitted with the inner wall of the energy capture column shell 10, and a rubber gasket is installed in the middle to ensure its airtightness.

[0047] See also Figures 8 to 10 The method for using the automatic frequency regulation device of the wind-induced vortex-induced vibration generator of the present invention is applicable to the following actual working conditions:

[0048] Working condition 1: When the wind of a certain speed blows the energy capture device, the energy capture device swings periodically in the direction perpendicular to the incoming flow; since the weight block 8 is only affected by gravity and the tension along the connecting rod 7, when the energy capture device swings, the gravity of the weight block 8 will form an angle with the center line of the energy capture device, thereby driving the weight block 8 to do a simple pendulum motion; the moving weight block 8 drives the escapement structure to operate, so that the escapement wheel 5 rotates stably, and further makes the air exchange rate of the air pump structure tend to be stable; the air exchange of the air pump structure causes a pressure difference on the air pump cover 2 , pressure difference Push the air pump cover 2 and the device below it to move downward, and the pressure difference The pressure relief hole 19 will be ventilated until the ventilation rate of the pressure relief hole 19 is consistent with the ventilation rate of the air pump structure, at which time the automatic frequency regulation device stays at a certain height and operates stably;

[0049] Working condition 2 based on working condition 1: When the incoming flow velocity increases, the vortex-induced vibration frequency of the energy capture device increases, the swing frequency of the weight 8 accelerates, the escape wheel 5 accelerates, and the ventilation rate of the air pump structure accelerates; assuming that the position of the air pump cover 2 remains unchanged, the pressure difference between the upper and lower surfaces of the air pump cover 2 due to the accelerated ventilation rate of the air pump structure If the pressure increases, the structure becomes unstable, which is inconsistent with the assumption. The air pump cover 2 and the structure below it move downward, and the ventilation rate of the pressure relief hole 19 increases until the air pump cover 2 reaches the next stable state. Since part of the structure moves downward, the center of mass of the entire device moves downward, thereby increasing the natural frequency of the wind-induced vortex-induced vibration generator.

[0050] Working condition 3 based on working condition 1: When the incoming flow velocity decreases, the vortex-induced vibration frequency of the energy capture device decreases, the swing frequency of the weight 8 slows down, the escape wheel 5 slows down, and the ventilation rate of the air pump structure slows down; assuming that the position of the air pump cover 2 remains unchanged, the pressure difference between the upper and lower surfaces of the air pump cover 2 due to the slow ventilation rate of the air pump structure If it decreases, the structure becomes unstable, which is inconsistent with the assumption. The air pump cover 2 and the structure below it move upward, and the ventilation rate of the pressure relief hole 19 slows down until the air pump cover 2 reaches the next stable state. Since part of the structure moves upward, the center of mass of the entire device moves upward, thereby reducing the natural frequency of the wind-induced vortex-induced vibration generator.

[0051] Working condition 4 based on working condition 1: When the direction of the incoming wind changes, the energy capture device will experience a short period of instability. Assuming that the impact on the energy capture device shell during this period is negligible, it can be considered that the swing direction of the energy capture device is always perpendicular to the incoming flow direction. At this time, the swing direction of the weight block 8 in the automatic frequency modulation device has a certain angle with the incoming flow direction. However, due to gravity and inertia, the weight block will drive the entire device to swing in a partial circle centered on the swing center of the energy capture device, and gradually recover until it stabilizes.

[0052] The method for using the above-mentioned automatic frequency regulation device of the wind-induced vortex-induced vibration generator is specifically implemented as follows:

[0053] Step 1: When the wind of a certain speed blows the energy capture device, the energy capture device swings periodically in a direction perpendicular to the incoming flow;

[0054] Step 2: When the energy capture device swings, since the weight block 8 is only affected by gravity and the pulling force along the connecting rod 7, the gravity of the weight block 8 will form an angle with the center line of the energy capture device, thereby driving the weight block 8 to do a simple pendulum motion;

[0055] Step 3: Determine whether the direction of the incoming flow has changed. If so, the energy capture device will experience a short period of instability. Assuming that the impact on the energy capture device housing during this period is negligible, it can be considered that the swing direction of the energy capture device is always perpendicular to the incoming flow direction. At this time, the swing direction of the weight block 8 in the automatic frequency modulation device is at a certain angle to the incoming flow direction. However, due to gravity, inertia, etc., the weight block 8 will drive the entire device to swing in a partial circle centered on the swing center of the energy capture device, gradually recovering until it stabilizes. If not, proceed to the next step.

[0056] Step 4: The weight 8 performs a simple pendulum motion, causing the pallet fork 6 to rotate the escape wheel 5. The swing rate of the energy capture device is linearly related to the rotation frequency of the escape wheel 5.

[0057] Step 5: The escape wheel 5 is fixedly connected to the push wheel 14, and the escape wheel 5 drives the push wheel 14 to rotate, thereby making the air pump structure stable for ventilation;

[0058] Step 6: Ventilate the air pump structure to create a pressure difference between the upper and lower surfaces of the air pump cover 2 , pressure difference Push the air pump cover 2 and the device below it to move, and at the same time the pressure difference It will directly affect the ventilation rate of the pressure relief hole 19;

[0059] Step 7: Determine whether the incoming flow velocity has changed. If so, repeat step 2; otherwise, proceed to the next step.

[0060] Step 8: until the air exchange rate of the pressure relief hole 19 is consistent with the air exchange rate of the air pump structure, the automatic frequency regulation device stays at a certain height and operates stably.

Claims

1. An automatic frequency regulation device for a wind-induced vortex-induced vibration generator, comprising an energy capture device, a fixed support system, an energy conversion system, a control system, and a reset system; the energy capture device comprises an energy capture column housing, a column bottom cover fixedly mounted at the lower end of the energy capture column housing, and a mast fixedly mounted on the central axis of the energy capture column housing; the fixed support system comprises a generator housing and a base fixed to the generator housing, the lower end of the mast being rotatably mounted within the internal structure of the generator housing via a rotating ball; and characterized in that: The energy conversion system includes a sleeve mounted on the upper portion of the mast, which can slide up and down and rotate on the mast, and the sleeve coincides with the center line of the mast; a sleeve connecting rod I and a sleeve connecting rod II, whose axes are parallel to each other, are fixedly connected in the same vertical plane on the same vertical line on the surface of the sleeve, and the sleeve connecting rod I and the sleeve connecting rod II are respectively connected to the center of the escapement wheel and the escapement fork through a limit rod II and a limit rod III; a weight block is fixedly connected to the lower end extension line of the escapement fork center line through a connecting rod, and the escapement fork and the escapement wheel are matched through a tooth groove; a cam-shaped push wheel is fixedly connected to the outer side of the escapement wheel, and the push wheel center line is parallel to the escapement wheel center line; The control system includes an air plug rod and an air pump device, and the push wheel slides on the upward extension line of the center line of the air plug rod to constrain the air plug rod; the reset system includes a rotating reset plate, which is elastically connected to the control system through four vertical springs; The energy conversion system operates by converting the gravitational potential energy of the weight into mechanical energy of the generator automatic frequency regulation device; the control system abuts against the driving wheel of the energy conversion system through the air plug rod, converts the mechanical energy into kinetic energy, and adjusts the center of mass position of the energy capture device by controlling the ventilation rate; the reset system is elastically connected to the control system, and plays a reset support role for the entire generator automatic frequency regulation device. When the pressure difference between the upper and lower surfaces of the air pump device decreases, the restoring force of the reset system is greater than the pressure difference, thereby causing the generator automatic frequency regulation device to gradually return to its initial position.

2. The automatic frequency regulation device for a wind-induced vortex-induced vibration generator according to claim 1, characterized in that: The air pump device comprises an air pump barrel, an air pump lower cover and an air pump upper cover; after the air plug rod slides through the center of the air pump lower cover of the air pump barrel, its top end is fixedly connected to the air plug; the outer wall diameter of the air pump barrel is smaller than the inner wall radius of the energy capture column shell, the air pump lower cover is fixedly connected to the bottom of the air pump barrel, the air pump upper cover is sealed and fixedly connected to the top of the air pump barrel, and the air pump upper cover is slidably connected to the inner wall of the energy capture column shell; the bottom center of the air pump upper cover is fixedly connected to the top of the sleeve; the air pump upper cover is provided with three air holes, a pressure relief hole and a U-shaped air guide tube, wherein the air Hole 1 and air hole 2 are located on the same radial direction on the air pump cover, and air hole 3 is located on another radial direction on the air pump cover; air hole 1 and air hole 2 are also located on the top of the air pump barrel and are respectively provided with air nozzle Ⅰ and air nozzle Ⅱ; the U-shaped air guide tube is installed on the upper surface of the air pump cover, one end of which is installed above air hole 2, and the other end of the U-shaped air guide tube is installed above air hole 3, and no air nozzle is installed in air hole 3; the air nozzle Ⅰ can only discharge the gas in the air pump barrel to the outside of the air pump barrel, and the air nozzle Ⅱ can only transmit the gas outside the air pump barrel to the air pump barrel.

3. The automatic frequency regulation device for a wind-induced vortex-induced vibration generator according to claim 2, characterized in that: The rotation reset piece is rotationally connected to the mast through the limit rod I at the top of the mast, and the rotation reset piece is slidingly connected to the inner wall of the energy capture column shell; the mast passes through the center of the air pump upper cover and is slidingly connected thereto.

4. The automatic frequency regulation device for a wind-induced vortex-induced vibration generator according to claim 2, characterized in that: The air plug rod is in clearance fit with the air pump lower cover of the air pump barrel; the air plug is in sliding fit with the inner wall of the air pump barrel, and a rubber gasket is installed in the middle to ensure its air tightness.

5. The automatic frequency regulation device for a wind-induced vortex-induced vibration generator according to claim 3 is characterized in that: The mast is slidably matched with the center of the air pump cover, a rubber gasket is installed in the middle to ensure its air tightness, and lubricating oil is applied to ensure that they can slide relative to each other; the air pump cover is slidably matched with the inner wall of the energy capture column shell, and a rubber gasket is installed in the middle to ensure its air tightness.

6. A method for using the automatic frequency regulation device of a wind-induced vortex-induced vibration generator according to any one of claims 1 to 5, characterized in that Applicable to the following actual working conditions: Working condition 1: When the wind of a certain speed blows the energy capture device, the energy capture device swings periodically in the direction perpendicular to the incoming flow; since the weight is only affected by gravity and the tension along the connecting rod, when the energy capture device swings, the gravity of the weight will form an angle with the center line of the energy capture device, thereby driving the weight to do a simple pendulum motion; the moving weight drives the escapement structure to operate, making the escapement wheel rotate stably, and further making the air exchange rate of the air pump structure tend to be stable; the air exchange of the air pump structure causes a pressure difference on the upper cover of the air pump , pressure difference Push the upper cover of the air pump and the device below it to move downward, and at the same time the pressure difference The pressure relief hole will be ventilated until the ventilation rate of the pressure relief hole is consistent with the ventilation rate of the air pump structure. At this time, the automatic frequency regulation device stays at a certain height and operates stably. Working condition 2 based on working condition 1: When the incoming flow velocity increases, the vortex-induced vibration frequency of the energy capture device increases, the swing frequency of the weight accelerates, the escapement wheel accelerates, and the air exchange rate of the air pump structure accelerates; assuming that the position of the air pump cover remains unchanged, the pressure difference between the upper and lower surfaces of the air pump cover due to the accelerated air exchange rate of the air pump structure If the pressure increases, the structure becomes unstable, which is inconsistent with the assumption. The air pump cover and the structure below it move downward, and the ventilation rate of the pressure relief hole increases until the air pump cover reaches the next stable state. Since part of the structure moves downward, the center of mass of the entire device moves downward, thereby increasing the natural frequency of the wind-induced vortex-induced vibration generator. Working condition 3 based on working condition 1: When the incoming flow velocity decreases, the vortex-induced vibration frequency of the energy capture device decreases, the swing frequency of the weight slows down, the escapement wheel slows down, and the ventilation rate of the air pump structure slows down; assuming that the position of the air pump cover remains unchanged, the pressure difference between the upper and lower surfaces of the air pump cover due to the slow ventilation rate of the air pump structure If the pressure decreases, the structure becomes unstable, which is inconsistent with the assumption. The air pump cover and the structure below it move upward, and the ventilation rate of the pressure relief hole slows down until the air pump cover reaches the next stable state. Since part of the structure moves upward, the center of mass of the entire device moves upward, thereby reducing the natural frequency of the wind-induced vortex-induced vibration generator. Working condition 4 based on working condition 1: When the direction of the incoming wind changes, the energy capture device will experience a short period of instability. Assuming that the impact on the energy capture device shell during this period is negligible, it can be considered that the swing direction of the energy capture device is always perpendicular to the incoming flow direction. At this time, the swing direction of the weight in the automatic frequency regulation device has a certain angle with the incoming flow direction, but due to gravity and inertia, the weight will drive the entire device to swing in a partial circle centered on the swing center of the energy capture device, and gradually recover until it stabilizes.

Images