An omnidirectional breeze energy-gathering power generation device based on flexible piezoelectricity

Abstract

The present invention discloses an omnidirectional breeze energy-gathering power generation device based on flexible piezoelectricity. Each energy-capturing structure is connected in sequence along the vertical direction to form an energy-capturing array; the bottom end of each rotating shaft is fixedly connected to the top end of the rotating shaft of an energy-capturing structure below; each wind guide duct of each energy-capturing structure is connected to the rotating shaft at uniform intervals along the circumferential direction of the middle part of the outer side of the rotating shaft through a connecting rod (8); each flexible piezoelectric sheet is evenly installed in the ventilation duct. The present invention uses a flexible piezoelectric structure to capture the energy of the breeze, reducing the minimum wind speed for wind energy utilization. The wind guide duct and array combination design can collect more wind energy, effectively improving the power generation and wind energy utilization efficiency of the device.

Description

Technical Field

[0001] The invention relates to a wind power generation device, and specifically designs an omnidirectional breeze energy-gathering power generation device based on flexible piezoelectricity, which can generate electricity at a relatively low wind speed. Background Art

[0002] The current energy supply is still dominated by fossil energy, so clean energy is gaining more and more attention. According to existing discoveries and research, piezoelectric materials can transform under the action of mechanical force to achieve the conversion of mechanical energy into electrical energy, and the energy density of the conversion is very high. Piezoelectric materials themselves also have the advantages of low cost, simple structure, and easy processing shape. At present, they have been widely used in life, medical, industrial, military, aerospace and other fields, such as piezoelectric ignition gas stoves, pressure sensors, radar piezoelectric gyroscopes, etc.

[0003] The main way to generate electricity in wind farms is through wind turbines. Traditional wind power systems must generate electricity under the condition that the wind speed is greater than the cut-in wind speed of the wind turbine and less than its cut-out wind speed. Therefore, more than half of the wind energy cannot be fully captured and utilized, and there is still much room for improvement in the utilization rate of wind energy. Summary of the invention

[0004] In response to the problems raised in the background technology, based on the problem that traditional wind turbines cannot operate at low wind speeds, in order to make full use of wind energy resources under low wind speed conditions, the present invention provides an omnidirectional breeze energy-gathering power generation device based on the power generation characteristics of flexible piezoelectric materials, which can effectively extract low wind speed wind energy, and the array combination design can effectively improve the power generation and wind energy utilization efficiency of the device. When piezoelectric materials are subjected to pressure, voltage will be generated on both end surfaces, that is, current can be output, and wind energy as a form of energy can generate wind pressure. Therefore, the idea of ​​using breeze to generate electricity based on the piezoelectric effect is feasible. At the same time, in view of the power generation properties of flexible piezoelectricity, this power generation method using breeze is more flexible, simple in structure, and safer, and has a higher utilization rate of wind energy under low wind speeds.

[0005] The technical solution of the present invention is:

[0006] The omnidirectional breeze energy-gathering power generation device of the present invention comprises a plurality of energy-capturing structures, each of which is connected in sequence along a vertical direction to form an energy-capturing array; each energy-capturing structure comprises a plurality of wind guide ducts, a rotating shaft and a plurality of connecting rods, the rotating shafts are arranged vertically, and the bottom end of each rotating shaft is fixedly connected to the top end of the rotating shaft of a lower energy-capturing structure.

[0007] The air guide ducts of each energy capture structure are connected to the rotating shaft at even intervals along the circumferential direction of the middle part of the outer side of the rotating shaft through a connecting rod, and the air guide ducts do not contact each other.

[0008] The air guide duct comprises a plurality of flexible piezoelectric sheets, a plurality of piezoelectric component fixing structures and a ventilation pipe, wherein each flexible piezoelectric sheet is evenly installed in the ventilation pipe through two corresponding piezoelectric component fixing structures; and each ventilation pipe is arranged horizontally.

[0009] The peripheries of both ends of each ventilation pipe extend toward both sides of the ventilation pipe to form trumpet-shaped air deflectors; the air deflectors can increase the intensity of the airflow passing through the ventilation pipe and improve the energy capture efficiency.

[0010] A connecting hole is provided in the middle of the side surface of each ventilation pipe, one end of each connecting rod is fixedly connected to the connecting hole of a corresponding ventilation pipe, and the other end of the connecting rod is fixedly connected to the outer side wall of the rotating shaft.

[0011] Each air duct is 3D printed in one piece.

[0012] Each piezoelectric component fixing structure inside each ventilation pipe is fixed on the inner wall of the ventilation pipe along the length direction of the ventilation pipe, one of the longitudinal sections of the ventilation pipe is used as the symmetry plane, and every two piezoelectric component fixing structures are arranged axially symmetrically to the symmetry plane.

[0013] The symmetrical two sides of each flexible piezoelectric sheet are fixed on the inner wall of the ventilation pipe through two corresponding piezoelectric component fixing structures that are axially symmetrical to the symmetry plane, and the flexible piezoelectric sheets do not contact each other.

[0014] Each ventilation duct can select different symmetry planes for the arrangement of flexible piezoelectric sheets.

[0015] In each of the ventilation pipes, the spacing distances between the plurality of piezoelectric component fixing structures located on the same side of the symmetry plane are equal.

[0016] The length of each piezoelectric component fixing structure is equal to or slightly smaller than the length of the ventilation pipe.

[0017] The distance between the two piezoelectric component fixing structures corresponding to the two symmetrical sides of each flexible piezoelectric sheet is smaller than the piezoelectric sheet length of the flexible piezoelectric sheet between the two symmetrical sides, so that the flexible piezoelectric sheet can vibrate under the action of airflow.

[0018] The number of the flexible piezoelectric sheets in each ventilation pipe is two to four.

[0019] The flexible piezoelectric sheet is made of PVDF material.

[0020] A bearing is installed in the rotating shaft of each energy-capturing structure, and an assembly interface is provided at the bottom end of the rotating shaft. The bottom end of each rotating shaft is fixedly connected to the top end of the bearing in the rotating shaft of a lower energy-capturing structure through the assembly interface. The bottom end of the rotating shaft of the lowest energy-capturing structure of the omnidirectional breeze energy-concentrating power generation device is fixed to the external fixed structure through the assembly interface.

[0021] Each rotating shaft rotates around its own bearing when each wind guide duct is acted upon by wind, thereby achieving omnidirectional wind energy capture by the energy capture array and balancing the wind pressure difference.

[0022] A slip ring is provided inside the bearing of each energy-capturing structure, and an electric wire is led out from each flexible piezoelectric sheet of the energy-capturing structure. The electric wires of each flexible piezoelectric sheet pass through the connection hole and the connecting rod of the rotating shaft in turn, and then pass through the rotating shaft and the bearing inside the rotating shaft, and then pass through a slip ring inside the bearing and several slip rings above it in turn, and pass out from the bottom end of the top energy-capturing structure of the omnidirectional breeze energy-gathering power generation device, and are electrically connected to a rectifier step-up and step-down device provided outside the omnidirectional breeze energy-gathering power generation device, and are electrically connected to an external energy storage device through the rectifier step-up and step-down device, the energy storage device being such as a battery, a supercapacitor, etc.; the electric energy generated by the omnidirectional breeze energy-gathering power generation device after power generation is finally stored in the energy storage device, and the electric energy stored in the energy storage device directly powers some nearby low-power electrical appliances, or is directly connected to the power grid.

[0023] The wires of each flexible piezoelectric sheet of the top energy-harvesting structure directly pass through a top slip ring and out of the omnidirectional breeze energy-gathering power generation device.

[0024] Under the action of breeze, the airflow formed by the breeze in the omnidirectional breeze energy-concentrating power generation device passes through the air guide ducts of each energy-capturing structure, forming eddies on both sides of each flexible piezoelectric sheet, causing each flexible piezoelectric sheet to produce continuous vortex-induced vibration, and then converting the vibration energy into electrical energy through the piezoelectric effect. The electrical energy generated by each flexible piezoelectric sheet is transmitted to an external energy storage device for storage, ultimately realizing the conversion of wind energy into electrical energy.

[0025] The beneficial effects of the present invention are:

[0026] The present invention adopts a flexible piezoelectric energy capture power generation method, avoiding the shortcomings of traditional wind turbines that are complex in structure and cannot operate at lower wind speeds. It can capture and utilize breeze energy under low wind speed conditions, reducing the minimum power generation wind speed for wind energy utilization. The present invention uses a deflector to expand the wind energy collection range, increase power generation and wind energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the overall design diagram of the present invention;

[0028] Figure 2 It is a partial design drawing of the energy-capturing structure of the present invention;

[0029] Figure 3 It is a partial design drawing of the air guide duct of the present invention;

[0030] Figure 4 This is a partial design drawing of the flexible piezoelectric sheet;

[0031] Figure 5 It is the design drawing of the rotating shaft part;

[0032] In the figure, 1. air guide duct, 2. flexible piezoelectric sheet, 3. rotating shaft, 4. ventilation pipe, 5. air guide cover, 6. connecting hole, 7. piezoelectric component fixing structure, 8. connecting rod, 9. bearing, 10. assembly interface. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] like Figure 1 and Figure 2 As shown, the omnidirectional breeze energy-gathering power generation device of the present invention includes a plurality of energy-capturing structures, each of which is connected in sequence along the vertical direction to form an energy-capturing array; each of the energy-capturing structures includes a plurality of air-guiding ducts 1, a rotating shaft 3 and a plurality of connecting rods 8, the rotating shaft 3 is arranged vertically, and the bottom end of each rotating shaft 3 is fixedly connected to the top end of the rotating shaft 3 of a lower energy-capturing structure; each of the air-guiding ducts 1 of each energy-capturing structure is connected to the rotating shaft 3 at even intervals along the circumferential direction of the outer middle part of the rotating shaft 3 through a connecting rod 8, and each of the air-guiding ducts 1 does not contact each other.

[0035] like Figure 3 and Figure 4 As shown, the air guide duct 1 includes a plurality of flexible piezoelectric sheets 2, a plurality of piezoelectric component fixing structures 7 and a ventilation pipe 4, and each flexible piezoelectric sheet 2 is evenly installed in the ventilation pipe 4 through two corresponding piezoelectric component fixing structures; each ventilation pipe 4 is arranged horizontally; the periphery of both ends of each ventilation pipe 4 extends toward both sides of the ventilation pipe 4 to form a trumpet-shaped air guide cover 5; the air guide cover 5 can increase the intensity of the airflow passing through the ventilation pipe 4 and improve the energy capture efficiency.

[0036] Each piezoelectric component fixing structure 7 inside each ventilation pipe 4 is fixed on the inner wall of the ventilation pipe 4 along the length direction of the ventilation pipe 4, and one of the longitudinal sections of the ventilation pipe 4 is used as a symmetry plane, and each two piezoelectric component fixing structures 7 are arranged axially symmetrically to the symmetry plane; the symmetrical two sides of each flexible piezoelectric sheet 2 are fixed on the inner wall of the ventilation pipe 4 through two corresponding piezoelectric component fixing structures 7 axially symmetrical to the symmetry plane, and each flexible piezoelectric sheet 2 does not contact each other. Each ventilation pipe 4 can select different symmetry planes for arranging the flexible piezoelectric sheets 2.

[0037] In each ventilation duct 4, the spacing distances between the several piezoelectric component fixing structures 7 located on the same side of the symmetry plane are equal; the length of each piezoelectric component fixing structure 7 is equal to or slightly less than the length of the ventilation duct 4. The distance between the two piezoelectric component fixing structures 7 corresponding to the two symmetrical sides of each flexible piezoelectric sheet 2 is less than the piezoelectric sheet length of the flexible piezoelectric sheet 2 between the two symmetrical sides, so that the flexible piezoelectric sheet 2 can vibrate under the action of airflow. The number of flexible piezoelectric sheets 2 in each ventilation duct 4 is two to four. The flexible piezoelectric sheet 2 is made of PVDF material.

[0038] A connecting hole 6 is provided in the middle of the side of each ventilation pipe 4, one end of each connecting rod 8 is fixedly connected to the connecting hole 6 of a corresponding ventilation pipe 4, and the other end of the connecting rod 8 is fixedly connected to the outer wall of the rotating shaft 3. Each air guide pipe 1 is integrally printed by 3D printing.

[0039] like Figure 5 As shown, a bearing 9 is installed in the rotating shaft 3 of each energy capture structure, and an assembly interface 10 is provided at the bottom end of the rotating shaft 3. The bottom end of each rotating shaft 3 is fixedly connected to the top end of the bearing 9 in the rotating shaft 3 of a lower energy capture structure through the assembly interface 10. The bottom end of the rotating shaft 3 of the lowermost energy capture structure of the omnidirectional breeze energy-gathering power generation device is fixed to the external fixed structure through the assembly interface 10. Each rotating shaft 3 rotates around its own bearing 9 when each wind duct 1 is acted upon by wind, thereby realizing omnidirectional wind energy capture of the energy capture array and achieving a balance of wind pressure difference.

[0040] Each bearing 9 of the energy-capturing structure is provided with a slip ring inside, and each flexible piezoelectric sheet 2 of the energy-capturing structure leads out an electric wire. The electric wires of each flexible piezoelectric sheet 2 sequentially pass through the connection hole 6 and the connecting rod 8 of the rotating shaft 3, and then pass through the rotating shaft 3 and the bearing 9 inside the rotating shaft 3, and then sequentially pass through a slip ring inside the bearing 9 and several slip rings above it, and pass out from the bottom end of the top energy-capturing structure of the omnidirectional breeze energy-gathering power generation device, and are electrically connected to the rectifier step-up and step-down device provided outside the omnidirectional breeze energy-gathering power generation device, and are electrically connected to the external energy storage device through the rectifier step-up and step-down device, such as a battery, a supercapacitor, etc.; the electric energy generated by the omnidirectional breeze energy-gathering power generation device after power generation is finally stored in the energy storage device, and the electric energy stored in the energy storage device directly supplies power to some nearby low-power electrical appliances, or is directly connected to the power grid. The electric wires of each flexible piezoelectric sheet 2 of the top energy-capturing structure directly pass through the top slip ring and pass out of the omnidirectional breeze energy-gathering power generation device.

[0041] Under the action of breeze, the airflow formed by the breeze passes through the air guide duct 1 of each energy-capturing structure of the omnidirectional breeze energy-concentrating power generation device, forming eddy currents on both sides of each flexible piezoelectric sheet 2, causing each flexible piezoelectric sheet 2 to produce continuous vortex-induced vibration, and then converting the vibration energy into electrical energy through the piezoelectric effect. The electrical energy generated by each flexible piezoelectric sheet 2 is transmitted to an external energy storage device for storage, ultimately realizing the conversion of wind energy into electrical energy.

[0042] The specific implementation process of the present invention is as follows:

[0043] In a specific implementation, when a breeze blows, the deflector 5 collects the airflow, increases the strength of the airflow, and causes the airflow to drive the flexible piezoelectric sheet 2 to vibrate in the ventilation pipe 4. The flexible piezoelectric sheet 2 converts the mechanical energy of vibration into electrical energy based on the piezoelectric effect. At the same time, when the energy capture array is in a rotating state, under the action of time-varying wind, the uneven wind causes the flexible piezoelectric sheet 2 to oscillate back and forth and deform, which also promotes the generation of electrical energy.

[0044] The present invention adopts a flexible piezoelectric energy capture power generation method, and uses the deflector 5 to expand the wind energy collection range, increase the power generation and wind energy utilization efficiency, and avoids the shortcomings of traditional wind turbines with complex structures and inability to operate at lower wind speeds. It can capture and utilize breeze energy under low wind speed conditions, reducing the minimum power generation wind speed for wind energy utilization.

Claims

1. An omnidirectional breeze energy-gathering power generation device based on flexible piezoelectricity, characterized in that: It comprises a plurality of energy capture structures, each of which is connected in sequence in a vertical direction to form an energy capture array; each energy capture structure comprises a plurality of air guide ducts (1), a rotating shaft (3) and a plurality of connecting rods (8); the rotating shaft (3) is arranged vertically, and the bottom end of each rotating shaft (3) is fixedly connected to the top end of the rotating shaft (3) of a lower energy capture structure; The air guide ducts (1) of each energy capture structure are connected to the rotating shaft (3) at even intervals along the circumferential direction of the middle part of the outer side of the rotating shaft (3) via a connecting rod (8), and the air guide ducts (1) do not contact each other. The air guide duct (1) comprises a plurality of flexible piezoelectric sheets (2), a plurality of piezoelectric component fixing structures (7) and a ventilation pipe (4); each flexible piezoelectric sheet (2) is evenly spaced and installed in the ventilation pipe (4) via two corresponding piezoelectric component fixing structures; each ventilation pipe (4) is arranged horizontally; The peripheries of both ends of each ventilation pipe (4) extend towards both sides of the ventilation pipe (4) to form trumpet-shaped air guide covers (5); A connecting hole (6) is provided in the middle of the side surface of each ventilation pipe (4); one end of each connecting rod (8) is fixedly connected to the connecting hole (6) of a corresponding ventilation pipe (4); and the other end of the connecting rod (8) is fixedly connected to the outer wall of the rotating shaft (3); Each piezoelectric component fixing structure (7) inside each ventilation pipe (4) is fixed to the inner wall of the ventilation pipe (4) along the length direction of the ventilation pipe (4), one of the longitudinal sections of the ventilation pipe (4) is used as a symmetry plane, and each two piezoelectric component fixing structures (7) are arranged axially symmetrically with respect to the symmetry plane; The symmetrical two sides of each flexible piezoelectric sheet (2) are fixed to the inner wall of the ventilation pipe (4) via two corresponding piezoelectric component fixing structures (7) that are axially symmetrical to the symmetry plane, and the flexible piezoelectric sheets (2) are not in contact with each other; The distance between the two piezoelectric component fixing structures (7) connected to the symmetrical two sides of each flexible piezoelectric sheet (2) is smaller than the piezoelectric sheet length of the flexible piezoelectric sheet (2) between the two symmetrical two sides; A bearing (9) is mounted inside the rotating shaft (3) of each energy-capturing structure, and an assembly interface (10) is provided at the bottom end of the rotating shaft (3). The bottom end of each rotating shaft (3) is fixedly connected to the top end of the bearing (9) inside the rotating shaft (3) of a lower energy-capturing structure via the assembly interface (10). The bottom end of the rotating shaft (3) of the lowermost energy-capturing structure of the omnidirectional breeze energy-gathering power generation device is fixed to the external fixed structure via the assembly interface (10); Each rotating shaft (3) rotates around its own bearing (9) when each air guide duct (1) is acted upon by wind force; In the omnidirectional breeze energy-gathering power generation device, under the action of breeze, the airflow formed by the breeze passes through the interior of the wind guide duct (1) of each energy-capturing structure, forming eddies on both sides of each flexible piezoelectric sheet (2), so that each flexible piezoelectric sheet (2) generates continuous vortex-induced vibration, and then converts the vibration energy into electrical energy through the piezoelectric effect. The electrical energy generated by each flexible piezoelectric sheet (2) is transmitted to an external energy storage device for storage, thereby finally realizing the conversion of wind energy into electrical energy.

2. According to claim 1, a flexible piezoelectric omnidirectional breeze energy-gathering power generation device is characterized in that: In each of the ventilation pipes (4), the spacing distances between the plurality of piezoelectric component fixing structures (7) located on the same side of the symmetry plane are equal; The length of each piezoelectric component fixing structure (7) is equal to or less than the length of the ventilation pipe (4).

3. According to claim 1, the flexible piezoelectric omnidirectional breeze energy-gathering power generation device is characterized in that: The number of the flexible piezoelectric sheets (2) in each ventilation pipe (4) is two to four.

4. According to claim 1, the flexible piezoelectric omnidirectional breeze energy-gathering power generation device is characterized in that: The flexible piezoelectric sheet (2) is made of PVDF material.

5. According to claim 1, the flexible piezoelectric omnidirectional breeze energy-gathering power generation device is characterized in that: A slip ring is provided inside the bearing (9) of each energy-capturing structure, and an electric wire is led out of each flexible piezoelectric sheet (2) of the energy-capturing structure. The electric wire of each flexible piezoelectric sheet (2) sequentially passes through the connection hole (6) and the connecting rod (8) of the rotating shaft (3) where it is located, then passes through the rotating shaft (3) and the bearing (9) inside the rotating shaft (3), and then sequentially passes through a slip ring inside the bearing (9) and a plurality of slip rings above it, and then passes out from the bottom end of an energy-capturing structure at the top of the omnidirectional breeze energy-gathering power generation device, and is electrically connected to a rectifier step-up and step-down device provided outside the omnidirectional breeze energy-gathering power generation device, and is electrically connected to an external energy storage device through the rectifier step-up and step-down device.

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