Variable frequency excitation multi-module vibrator piezoelectric wind power generation system

Abstract

The invention provides a variable-frequency excitation multi-module vibrator piezoelectric wind power generation system, and relates to the technical field of piezoelectric vibrators. The variable-frequency excited multi-module vibrator piezoelectric wind power generation system comprises a base, a shell, a rotating shaft, blades, a spacer ring, two groups of wheel discs and a plurality of groups of piezoelectric vibrator modules. According to the invention, when the piezoelectric vibrator module recovers to a straight state from a deformation state, the piezoelectric vibrator module can be completely supported through the side wall of the spacer ring, the piezoelectric plate is prevented from being reversely bent, the side wall of the spacer ring is also provided with the buffer pad, the impact caused when the piezoelectric vibrator module recovers to the straight state can be effectively buffered, and the service life is effectively prolonged; the limiting magnet for limiting and the excitation magnet for excitation can dynamically adjust the position when the blade rotates under wind, and the variable-frequency excitation effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of piezoelectric vibrators, in particular to a variable frequency excited multi-module vibrator piezoelectric wind power generation system. Background Art

[0002] Wind energy is widely present in nature, and wind power generation has become one of the mainstream energy sources in the world today. In the past, people only focused on the research of large-scale wind power generation systems. In recent years, with the increasing maturity of wireless sensor network technology and its popularization in environmental monitoring, health monitoring of large buildings and bridges, industry, military and public safety, the research on micro wind turbines that provide continuous energy supply has attracted widespread attention from scholars at home and abroad. The reason is that the energy of chemical batteries is limited and their service life is far less than the life of wireless sensor monitoring systems, so they need to be replaced frequently, which seriously restricts the promotion and application of wireless sensor network monitoring systems in remote and dangerous environments. The micro wind turbines proposed so far are basically based on electromagnetic principles and piezoelectric principles. Because piezoelectric generators do not generate electromagnetic interference during the power generation process, they are more suitable for wireless systems such as wireless network nodes. There are two main types of wind turbines that use thin-film piezoelectric vibrators: one is the blowing excitation type, that is, the wind is directly used to blow the piezoelectric vibrator to make it bend and deform and generate electricity; the other is the rotational excitation type, that is, the wind is first used to rotate the blades, and then the blades drive the rotating mechanism to bend and deform the piezoelectric vibrator and generate electricity. The common feature of the above-mentioned piezoelectric generators is that they directly use the inertial force of the mass at the end of the piezoelectric vibrator to bend and deform it and generate electricity. The main disadvantages are: the piezoelectric vibrator deforms in both directions, the piezoelectric sheet is subjected to alternating tensile and compressive stresses, and there is a lack of necessary limiting measures;

[0003] In order to solve the above problems, there is a public technology on the market that proposes a rotary piezoelectric wind turbine, which belongs to the field of piezoelectric power generation. The end cover is installed on the end of the cylinder wall of the shell, and the end cover and the bottom wall of the shell are equipped with limiting magnets; two groups of piezoelectric vibrators and a spacer ring are installed on the cylinder wall boss. The piezoelectric vibrator is made of a substrate and a piezoelectric sheet bonded together. The spacer ring is evenly provided with spokes. The two groups of piezoelectric vibrators are symmetrically arranged on the left and right sides of the spacer ring, and the substrate is installed close to the spacer ring; the free end of the piezoelectric vibrator is equipped with an excited magnet, and the like poles of the excited magnets on the two groups of piezoelectric vibrators are installed oppositely. The repulsive force between the two groups of excited magnets causes the piezoelectric vibrators to rotate. The electric vibrator produces bending deformation; the spoke plate is located between two adjacent piezoelectric vibrators on the circumference; the two ends of the main shaft are mounted on the end cover and the bottom wall of the shell, and the wheel of the main shaft is evenly inlaid with excitation magnets, and the wheel and the excitation magnets are located between the piezoelectric vibrators on both sides of the partition ring; the magnetic poles of the excitation magnet are arranged along the axial direction of the main shaft; one end of the main shaft extends out through the bottom wall of the shell and is equipped with blades through screws. In this technology, the piezoelectric vibrator deforms unidirectionally, the piezoelectric sheet is only subjected to compressive stress and the maximum deformation is controllable, so the reliability is high.

[0004] However, in the above-mentioned disclosed technology, during the process that the deformation amount of the piezoelectric vibrator gradually decreases, the piezoelectric vibrator gradually fits against the spacer ring from the fixed end, but there is no limit on the side of the free end of the piezoelectric vibrator facing the spacer ring. When the exciting magnet on the wheel is not aligned with the excited magnet on the free end of the piezoelectric vibrator, when the piezoelectric vibrator recovers from the deformed state to the straight state, the piezoelectric vibrator will bend when it contacts the edge formed by the intersection of the inner wall of the spacer ring and the side wall of the spacer ring, which will still cause the piezoelectric vibrator to deform in both directions. After repeated reciprocating, the part will break due to stress concentration, and the service life is not long. In addition, in the above-mentioned disclosed technology, the excitation frequency of the piezoelectric vibrator does not have the function of dynamic adjustment. In summary, it is necessary to optimize and improve the structure of the multi-module vibrator piezoelectric wind power generation system, in order to develop a multi-module vibrator piezoelectric wind power generation system with variable frequency excitation. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a multi-module vibrator piezoelectric wind power generation system with variable frequency excitation, which solves the problems in the prior art that the piezoelectric vibrators of the multi-module vibrator piezoelectric wind power generation system are prone to reverse bending and breaking, and the excitation frequency cannot be dynamically adjusted.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a variable frequency excited multi-module vibrator piezoelectric wind power generation system, comprising a base, a shell, a rotating shaft, blades, a spacer ring, two groups of wheel discs and multiple groups of piezoelectric vibrator modules, the shell is fixedly connected to the upper wall of the base through a fixing frame, a group of end covers are fixedly connected at both axial ends of the shell, the rotating shaft is rotatably connected between the two groups of end covers through two groups of bearing seats, the front end of the rotating shaft passes through the front group of the two groups of end covers and extends to the front side of the end cover, the blades are fixedly connected to the front end of the rotating shaft, the spacer ring is fixedly connected to the inner wall of the shell and is located in the middle of the axial length, the two groups of wheel discs are slidably connected to the outer wall of the rotating shaft and the two groups of wheel discs are radially opposite to the spacer ring, and the spacer ring is engineering plastic.

[0009] Preferably, a plurality of groups of exciting magnets are fixedly connected to the opposite sides of the two groups of wheel discs, and the plurality of groups of exciting magnets are equally distributed in a circle with the axis of the rotating shaft as the center. A first adjustment structure for adjusting the axial position of the wheel disc on the rotating shaft is arranged between the wheel disc and the rotating shaft. The plurality of groups of piezoelectric vibrator modules are fixedly connected to the inner wall of the shell and are respectively located on the left and right sides of the partition ring. The piezoelectric vibrator modules located on the same side of the partition ring in the plurality of groups are equally distributed in a circle with the axis of the shell as the center. The piezoelectric vibrator module consists of a substrate and a piezoelectric sheet. The substrate in the piezoelectric vibrator module is located on the side close to the partition ring, and the piezoelectric sheet is fixedly connected to the side away from the substrate and at one end facing the axis of the shell with an excited magnet. Buffer structures for buffering are arranged on the front and rear sides of the partition ring. A plurality of groups of limiting devices are arranged on the inner wall of the shell and on the front and rear sides of the partition ring. The plurality of groups of limiting devices are equally distributed in a circle with the axis of the shell as the center, and the limiting device consists of a second adjustment structure and a limiting magnet.

[0010] Preferably, an annular groove is provided on the inner side wall of the spacer ring, and the circumferential outer walls of the two groups of wheel discs extend into the inner side wall of the annular groove.

[0011] Preferably, the length of the piezoelectric sheet is consistent with the length of the substrate, and the inner diameter of the inner side wall of the isolation ring is smaller than the distance between opposite ends of two groups of piezoelectric sheets symmetrically distributed around the axis of the rotating shaft among the multiple groups of piezoelectric sheets.

[0012] Preferably, the buffer structure is two groups of buffer pads, and the two groups of buffer pads are respectively glued to the front wall and the rear wall of the partition ring, and the front view projections of the two groups of buffer pads coincide with the front view projections of the partition ring.

[0013] Preferably, the first adjustment structure includes two groups of electric telescopic rods, the two groups of electric telescopic rods are fixedly connected to the outer wall of the rotating shaft through fixed sleeves, and the two groups of electric telescopic rods are symmetrically distributed with the axis of the rotating shaft as the center, the wheel plate is fixedly connected to the ends of the extension shafts of the two groups of electric telescopic rods through two groups of connecting rods, the wheel plate is driven to move axially along the outer wall of the rotating shaft by extending and retracting the extension shafts of the two groups of electric telescopic rods, and the two groups of electric telescopic rods are powered by conductive slip rings.

[0014] Preferably, the second adjustment structure includes a sleeve, a slider, a motor and a gear, the sleeve is fixedly connected to the inner wall of the shell, the slider is slidably connected to the inner wall of the sleeve, the end of the slider close to the axis of the shell passes through the inner wall of the sleeve and extends to the outside of the sleeve, the limiting magnet is fixedly connected to the end of the slider extending to the outside of the sleeve, the sleeve and the slider are both arc-shaped and the radius of the arc matches the radius of the arc formed by the bending trajectory of one end of the piezoelectric piece toward the axis of the shell.

[0015] Preferably, a plurality of groups of teeth are provided on one side of the arc-shaped inner surface of the slider, a through groove opposite to the plurality of groups of teeth on the slider is provided on the side of the sleeve facing the spacer ring, the motor is fixedly connected to the side of the sleeve facing the spacer ring and is located beside the through groove, the gear is fixedly connected to the end of the motor output shaft, and the circumferential outer wall of the gear is meshed with the slider through the plurality of groups of teeth.

[0016] (III) Beneficial effects

[0017] The present invention provides a variable frequency excited multi-module vibrator piezoelectric wind power generation system, which has the following beneficial effects:

[0018] 1. Compared with the prior art, in the variable frequency excited multi-module vibrator piezoelectric wind power generation system, when the piezoelectric vibrator module recovers from a deformed state to a straight state, it can be fully supported by the side wall of the spacer ring to avoid reverse bending of the piezoelectric sheet. The side wall of the spacer ring is also provided with a buffer pad, which can effectively buffer the impact caused by the piezoelectric vibrator module recovering to a straight state, thereby effectively improving the service life.

[0019] 2. Compared with the prior art, the variable frequency excited multi-module vibrator piezoelectric wind power generation system, the limiting magnet used for limiting and the exciting magnet used for excitation can dynamically adjust the position when the blades are rotated by the wind, thereby realizing the effect of variable frequency excitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a schematic diagram of a partial cross-section of the internal structure of the housing of the present invention;

[0022] Figure 3 For the present invention Figure 2 A partial enlarged view of the middle A;

[0023] Figure 4 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0024] Figure 5 It is a partial cross-sectional schematic diagram of the side structure of the separator ring of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the sliding sleeve of the present invention;

[0026] Figure 7 It is a schematic diagram of the connection structure of the slider and the limiting magnet of the present invention.

[0027] Among them, 1. base; 2. fixing frame; 3. end cover; 4. shell; 5. rotating shaft; 6. blades; 7. spacer ring; 701, ring groove; 8. fixing sleeve; 9. electric telescopic rod; 10. connecting rod; 11. wheel; 12. exciting magnet; 13. buffer pad; 14. substrate; 15. piezoelectric sheet; 16. excited magnet; 17. sliding sleeve; 1701, through groove; 18. slider; 1801, teeth; 19. limiting magnet; 20. motor; 21. gear. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example:

[0030] like Figures 1 to 7As shown, an embodiment of the present invention provides a variable frequency excited multi-module vibrator piezoelectric wind power generation system, including a base 1, a shell 4, a rotating shaft 5, blades 6, a spacer ring 7, two groups of wheels 11 and multiple groups of piezoelectric vibrator modules, the shell 4 is fixedly connected to the upper wall of the base 1 through a fixing frame 2, a group of end covers 3 are fixedly connected at both axial ends of the shell 4, the rotating shaft 5 is rotatably connected between the two groups of end covers 3 through two groups of bearing seats, the front end of the rotating shaft 5 passes through the front group of the two groups of end covers 3 and extends to the front side of the end cover 3, the blades 6 are fixedly connected to the front end of the rotating shaft 5, and the spacer ring 7 is fixedly connected to the inner wall of the shell 4 and is located at the center of the axial length. The two groups of wheel discs 11 are both slidably connected to the outer wall of the rotating shaft 5 and the two groups of wheel discs 11 are radially opposite to the spacer ring 7. Multiple groups of excitation magnets 12 are fixedly connected to the opposite sides of the two groups of wheel discs 11. The multiple groups of excitation magnets 12 are equally distributed in a circle with the axis of the rotating shaft 5 as the center. Multiple groups of piezoelectric vibrator modules are fixedly connected to the inner wall of the shell 4 and are respectively located on the left and right sides of the spacer ring 7. The piezoelectric vibrator modules located on the same side of the spacer ring 7 in the multiple groups of piezoelectric vibrator modules are equally distributed in a circle with the axis of the shell 4 as the center. The piezoelectric vibrator module is composed of a substrate 14 and a piezoelectric sheet 15. In the piezoelectric vibrator module, the substrate 14 is located on the side close to the spacer ring 7, and the piezoelectric sheet 15 is located on the side close to the spacer ring 7. The side of 15 away from the substrate 14 and the end facing the axis of the shell 4 is fixedly connected with an excited magnet 16. In this embodiment, the working principle of the piezoelectric vibrator module is consistent with the working principle of a rotary piezoelectric wind turbine disclosed in Chinese Patent Publication No. CN107359814B, that is, when wind blows through the environment, the blades 6 rotate under the action of the wind, driving the rotating shaft 5 and the exciting magnet 12 to rotate together, so that the distance and the interaction force between the exciting magnet 12 and its corresponding excited magnet 16 are alternately increased and decreased. When there is a repulsive force between the exciting magnet 12 and the excited magnet 16, the exciting magnet 12 gradually rotates. When the excitation magnet 12 is close to the excited magnet 16, the deformation of the piezoelectric vibrator module and the compressive stress on the piezoelectric sheet 15 increase, and when the excitation magnet 12 gradually moves away, the deformation of the piezoelectric vibrator module and the compressive stress on the piezoelectric sheet 15 decrease; when there is an attractive force between the excitation magnet 12 and the excited magnet 16, the deformation of the piezoelectric vibrator module and the compressive stress on the piezoelectric sheet 15 decrease when the excitation magnet 12 gradually moves close to the excited magnet 16, and the deformation of the piezoelectric vibrator module and the compressive stress on the piezoelectric sheet 15 increase when the excitation magnet 12 gradually moves away; as the rotating shaft 5 rotates continuously, the compressive stress on the piezoelectric sheet 15 increases and decreases alternately, thereby converting mechanical energy into electrical energy;

[0031] In order to accommodate the wheel disc 11, the spacer ring 7 is made of engineering plastic, and the inner wall of the spacer ring 7 is provided with an annular groove 701. The outer circumference walls of the two sets of wheel discs 11 are both extended into the inner wall of the annular groove 701. The engineering plastic has a good impact resistance effect and is not magnetically isolated. By providing the annular groove 701 on the inner wall of the spacer ring 7, the outer circumference wall of the wheel disc 11 can be extended into the inner wall of the annular groove 701, so that the exciting magnet 12 and the excited magnet 16 can be axially opposite to each other;

[0032] In order to prevent the piezoelectric sheet 15 from bending in the opposite direction when it returns to a straight state, the length of the piezoelectric sheet 15 is consistent with the length of the substrate 14, and the inner diameter of the inner wall of the spacer ring 7 is smaller than the distance between the opposite ends of two groups of piezoelectric sheets 15 that are symmetrically distributed around the axis of the rotating shaft 5. By constraining the length of the piezoelectric sheet 15 and the substrate 14 and the inner diameter of the inner wall of the spacer ring 7, the piezoelectric sheet 15 and the substrate 14 can be fully supported when they return to a straight state, effectively avoiding the occurrence of reverse bending.

[0033] In order to buffer the impact force of the piezoelectric vibrator module returning to a straight state, a buffer structure for buffering is provided on both the front and rear sides of the spacer ring 7. The buffer structure is two groups of buffer pads 13. The two groups of buffer pads 13 are respectively glued to the front wall and the rear wall of the spacer ring 7. The front projections of the two groups of buffer pads 13 coincide with the front projections of the spacer ring 7. The buffer pads 13 can effectively buffer the impact force of the piezoelectric vibrator module returning to a straight state.

[0034] In order to dynamically adjust the distance between the exciting magnet 12 and the excited magnet 16, a first adjustment structure for adjusting the axial position of the wheel disc 11 on the rotating shaft 5 is provided between the wheel disc 11 and the rotating shaft 5. The first adjustment structure includes two groups of electric telescopic rods 9. The two groups of electric telescopic rods 9 are fixedly connected to the outer wall of the rotating shaft 5 through a fixing sleeve 8, and the two groups of electric telescopic rods 9 are symmetrically distributed with the axis of the rotating shaft 5 as the center. The wheel disc 11 is fixedly connected to the ends of the extended shafts of the two groups of electric telescopic rods 9 through two groups of connecting rods 10. The wheel disc 11 is driven to move axially along the outer wall of the rotating shaft 5 by extending and retracting the extended shafts of the two groups of electric telescopic rods 9. The two groups of electric telescopic rods 9 are powered by conductive slip rings. The extended shafts of the electric telescopic rods 9 are extended and retracted, which can drive the wheel disc 11 to move axially along the outer wall of the rotating shaft 5, thereby adjusting the distance between the exciting magnet 12 and the excited magnet 16 located on the side wall of the wheel disc 11, adjusting the excitation range, and achieving the purpose of variable frequency excitation.

[0035] In order to adapt to the adjustment action of the first adjustment structure, multiple groups of limit devices are arranged on the inner wall of the shell 4 and on the front and rear sides of the spacer ring 7. The multiple groups of limit devices are equally distributed in a circle with the axis of the shell 4 as the center. The limit device is composed of a second adjustment structure and a limit magnet 19. The second adjustment structure includes a sleeve 17, a slider 18, a motor 20 and a gear 21. The sleeve 17 is fixedly connected to the inner wall of the shell 4, and the slider 18 is slidably connected to the inner wall of the sleeve 17. The end of the slider 18 close to the axis of the shell 4 passes through the inner wall of the sleeve 17 and extends to the outside of the sleeve 17. The limit magnet 19 is fixedly connected to the end of the slider 18 extending to the outside of the sleeve 17. The sleeve 17 and the slider 18 are both arc-shaped, and the radius of the arc coincides with the bending track of the end of the piezoelectric piece 15 toward the axis of the shell 4. The radius of the arc formed by the trace is consistent, a plurality of groups of teeth 1801 are provided on one side of the arc-shaped inner arc surface of the slider 18, and a through groove 1701 opposite to the plurality of groups of teeth 1801 on the slider 18 is provided on the side of the sleeve 17 facing the spacer ring 7. The motor 20 is fixedly connected to the side of the sleeve 17 facing the spacer ring 7 and is located next to the through groove 1701. The gear 21 is fixedly connected to the end of the output shaft of the motor 20. The circumferential outer wall of the gear 21 is meshed with the slider 18 through the plurality of groups of teeth 1801. The rotation of the motor 20 can drive the gear 21 to rotate. When the gear 21 rotates, it drives the slider 18 to slide on the inner wall of the sleeve 17 through the meshing relationship with the plurality of groups of teeth 1801, thereby adjusting the distance between the limiting magnet 19 located at the end of the slider 18 and the excited magnet 16, and adjusting the limiting range.

[0036] Working principle: when there is wind blowing in the environment, the blades 6 rotate under the action of wind force, driving the rotating shaft 5 and the exciting magnet 12 to rotate together, so that the distance and interaction force between the exciting magnet 12 and its corresponding excited magnet 16 are alternately increased and decreased. When there is a repulsive force between the exciting magnet 12 and the excited magnet 16, the deformation of the piezoelectric vibrator module and the compressive stress on the piezoelectric sheet 15 increase when the exciting magnet 12 gradually approaches the excited magnet 16, and the deformation of the piezoelectric vibrator module and the compressive stress on the piezoelectric sheet 15 decrease when the exciting magnet 12 gradually moves away; when there is an attractive force between the exciting magnet 12 and the excited magnet 16, the deformation of the piezoelectric vibrator module and the compressive stress on the piezoelectric sheet 15 decrease when the exciting magnet 12 gradually approaches the excited magnet 16, and the deformation of the piezoelectric vibrator module and the compressive stress on the piezoelectric sheet 15 increase when the exciting magnet 12 gradually moves away; as the rotating shaft 5 rotates continuously, the compressive stress on the piezoelectric sheet 15 alternately increases and decreases, thereby converting mechanical energy into electrical energy. The groove 701 allows the outer circumferential wall of the wheel disc 11 to extend into the annular groove 701, so that the exciting magnet 12 and the excited magnet 16 can be axially opposite to each other. By constraining the length of the piezoelectric sheet 15 and the substrate 14 and the inner diameter of the inner wall of the spacer ring 7, the piezoelectric sheet 15 and the substrate 14 can be fully supported when they are restored to a straight state, effectively avoiding the occurrence of reverse bending. The buffer pad 13 can effectively buffer the impact force of the piezoelectric vibrator module restoring to a straight state. The electric telescopic rod 9 extends and retracts the shaft. The wheel 11 can be driven to move axially along the outer wall of the rotating shaft 5, thereby adjusting the distance between the exciting magnet 12 located on the side wall of the wheel 11 and the excited magnet 16, adjusting the excitation range, and achieving the purpose of variable frequency excitation. The rotation of the motor 20 can drive the gear 21 to rotate. When the gear 21 rotates, it drives the slider 18 to slide on the inner wall of the sleeve 17 through the meshing relationship with the multiple groups of teeth 1801, thereby adjusting the distance between the limiting magnet 19 located at the end of the slider 18 and the excited magnet 16, and adjusting the limiting range.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable frequency excited multi-module vibrator piezoelectric wind power generation system, characterized in that: The invention comprises a base (1), a shell (4), a rotating shaft (5), blades (6), a spacer ring (7), two groups of wheel discs (11) and a plurality of groups of piezoelectric vibrator modules, wherein the shell (4) is fixedly connected to the upper wall of the base (1) via a fixing frame (2), a group of end covers (3) are fixedly connected to the axial ends of the shell (4), the rotating shaft (5) is rotatably connected between the two groups of end covers (3) via two groups of bearing seats, the front end of the rotating shaft (5) passes through the front group of the two groups of end covers (3) and extends to the front side of the end covers (3), the blades (6) are fixedly connected to the front end of the rotating shaft (5), the spacer ring (7) is fixedly connected to the inner wall of the shell (4) and is located at the middle position of the axial length, the two groups of wheel discs (11) are slidably connected to the outer wall of the rotating shaft (5) and the two groups of wheel discs (11) are radially opposite to the spacer ring (7), and the spacer ring (7) is made of engineering plastic.

2. A variable frequency excited multi-module vibrator piezoelectric wind power generation system according to claim 1, characterized in that: A plurality of groups of excitation magnets (12) are fixedly connected to opposite sides of the two groups of wheel discs (11), and the plurality of groups of excitation magnets (12) are equally distributed in a circle with the axis of the rotating shaft (5) as the center. A first adjustment structure for adjusting the axial position of the wheel disc (11) on the rotating shaft (5) is provided between the wheel disc (11) and the rotating shaft (5). The plurality of groups of piezoelectric vibrator modules are fixedly connected to the inner wall of the shell (4) and are respectively located on the left and right sides of the spacer ring (7). The piezoelectric vibrator modules on the same side of the spacer ring (7) in the plurality of groups of piezoelectric vibrator modules are equally distributed in a circle with the axis of the shell (4) as the center. The piezoelectric vibrator modules are composed of The piezoelectric vibrator module is composed of a substrate (14) and a piezoelectric sheet (15). The substrate (14) in the piezoelectric vibrator module is located on a side close to a spacer ring (7). The piezoelectric sheet (15) is located on a side away from the substrate (14) and is fixedly connected to an excited magnet (16) at one end facing the axis of the shell (4). The front and rear sides of the spacer ring (7) are both provided with a buffer structure for buffering. The inner wall of the shell (4) and the front and rear sides of the spacer ring (7) are both provided with a plurality of groups of limiting devices. The plurality of groups of limiting devices are equally distributed in a circle with the axis of the shell (4) as the center. The limiting device is composed of a second adjustment structure and a limiting magnet (19).

3. A variable frequency excited multi-module vibrator piezoelectric wind power generation system according to claim 2, characterized in that: The inner side wall of the spacer ring (7) is provided with an annular groove (701), and the circumferential outer walls of the two groups of wheel discs (11) both extend into the inner side wall of the annular groove (701).

4. A variable frequency excited multi-module vibrator piezoelectric wind power generation system according to claim 3, characterized in that: The length of the piezoelectric sheet (15) is consistent with the length of the substrate (14), and the inner diameter of the inner wall of the spacer ring (7) is smaller than the distance between opposite ends of two groups of piezoelectric sheets (15) symmetrically distributed around the axis of the rotating shaft (5) among the multiple groups of piezoelectric sheets (15).

5. The variable frequency excited multi-module vibrator piezoelectric wind power generation system according to claim 4, characterized in that: The buffer structure comprises two groups of buffer pads (13), the two groups of buffer pads (13) are respectively glued to the front wall and the rear wall of the partition ring (7), and the front view projections of the two groups of buffer pads (13) coincide with the front view projections of the partition ring (7).

6. A variable frequency excited multi-module vibrator piezoelectric wind power generation system according to claim 5, characterized in that: The first adjustment structure comprises two groups of electric telescopic rods (9), the two groups of electric telescopic rods (9) are fixedly connected to the outer wall of the rotating shaft (5) through a fixing sleeve (8), and the two groups of electric telescopic rods (9) are symmetrically distributed with the axis of the rotating shaft (5) as the center, the wheel disc (11) is fixedly connected to the ends of the extension shafts of the two groups of electric telescopic rods (9) through two groups of connecting rods (10), the wheel disc (11) is driven to move axially along the outer wall of the rotating shaft (5) by the extension and retraction of the extension shafts of the two groups of electric telescopic rods (9), and the two groups of electric telescopic rods (9) are powered by conductive slip rings.

7. A variable frequency excited multi-module vibrator piezoelectric wind power generation system according to claim 6, characterized in that: The second adjustment structure comprises a sleeve (17), a slider (18), a motor (20) and a gear (21); the sleeve (17) is fixedly connected to the inner wall of the housing (4); the slider (18) is slidably connected to the inner wall of the sleeve (17); one end of the slider (18) close to the axis of the housing (4) passes through the inner wall of the sleeve (17) and extends to the outside of the sleeve (17); the limiting magnet (19) is fixedly connected to the end of the slider (18) extending to the outside of the sleeve (17); the sleeve (17) and the slider (18) are both arc-shaped, and the radius of the arc is consistent with the radius of the arc formed by the bending trajectory of one end of the piezoelectric film (15) toward the axis of the housing (4).

8. The variable frequency excited multi-module vibrator piezoelectric wind power generation system according to claim 7, characterized in that: A plurality of groups of teeth (1801) are arranged on one side of the arc-shaped inner arc surface of the slider (18); a through groove (1701) opposite to the plurality of groups of teeth (1801) on the slider (18) is arranged on the side of the sliding sleeve (17) facing the spacer ring (7); the motor (20) is fixedly connected to the side of the sliding sleeve (17) facing the spacer ring (7) and is located beside the through groove (1701); the gear (21) is fixedly connected to the end of the output shaft of the motor (20); and the circumferential outer wall of the gear (21) is meshed with the slider (18) through the plurality of groups of teeth (1801).

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