Rotary piezoelectric energy collector

Abstract

The utility model relates to a rotary piezoelectric energy collector, and belongs to the field of energy collection. The collector is composed of a cross-shaped rotating assembly, a piezoelectric power generation assembly and a cylindrical shell. The cross-shaped rotating assembly drives the piezoelectric power generation assembly through non-contact magnetic repulsion, the assembly comprises an outer rotating piece, an inner rotating piece and a rotating shaft, the rotating shaft penetrates through the shell cover plate, the outer rotating piece and the inner rotating piece are arranged at the two ends of the shaft respectively, the inner rotating piece is suspended in the sealing shell, and a first magnet is arranged at the tail end of the inner rotating piece. The piezoelectric power generation assembly is packaged in the cylindrical shell in an annular array mode and is composed of a lever mechanism, a piezoelectric stacking block with an elastic piece and a support. The second magnet at the tail end of the long arm of the lever mechanism is repelled by the first magnet to move towards the shell wall, and the short arm is driven to extrude the piezoelectric stacking block to generate electricity. According to the collector, non-contact magnetic driving force transmission and an annular piezoelectric array-lever gain technology are adopted, and rotating mechanical energy can be efficiently converted into electric energy.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the energy collection field relates to a rotary piezoelectric energy collector. BACKGROUND

[0002] With the extensive promotion and application of wireless device technology, energy supply mode has become the key link restricting its development. The traditional chemical battery power supply mode has many problems in service life, environmental protection and maintenance, etc. Therefore, developing a new type of energy supply mode is crucial to solve the continuous energy supply problem of micro electronic devices.

[0003] In recent years, with the development of renewable energy technology and the continuous growth of energy demand, energy harvesting technology has received extensive attention. Among them, piezoelectric energy harvesting technology converts mechanical energy into electrical energy through piezoelectric materials, which has become one of the research hotspots in the field of energy technology due to its advantages of high efficiency, environmental protection, small size and wide application range, especially in low-power devices, wireless sensor networks and other application scenarios. However, the traditional piezoelectric energy harvesting device is usually based on linear vibration or bending deformation, and the structure is relatively simple, but the energy conversion efficiency is limited, and it is difficult to meet the collection demand of mechanical energy in complex environment. Therefore, developing a high-efficiency, compact structure, and suitable for rotary motion scene piezoelectric energy collector, not only can significantly improve the energy conversion efficiency, but also can promote the application and development of mechanical equipment self-energy supply and wireless sensor network technology, has important practical value and broad application prospect. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a rotary piezoelectric energy collector, which aims at efficiently converting the mechanical energy generated by rotary motion into electrical energy.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A rotary piezoelectric energy collector, comprising a cross rotating assembly, a piezoelectric power generation assembly and a cylindrical shell, the cross rotating assembly drives the piezoelectric power generation assembly to work and generate electricity through non-contact magnetic repulsion;

[0007] The cross rotating assembly comprises an external rotating part, an internal rotating part and a rotating shaft, the rotating shaft penetrates the shell cover plate, the external rotating part and the internal rotating part are fixed at both ends of the rotating shaft respectively, the internal rotating part is suspended in the shell interior, and the shell interior is sealed;The end of the internal rotating part is provided with a first magnet;

[0008] The piezoelectric power generation assembly is packaged in a cylindrical shell and arranged in a ring array, comprising a lever mechanism, a piezoelectric stack with an elastic member, and a bracket for mounting the lever mechanism and the piezoelectric stack, the long arm of the lever mechanism is provided with a second magnet, the second magnet moves towards the inner wall of the cylindrical shell under the magnetic repulsion of the first magnet, and drives the short arm to extrude the piezoelectric stack, so that the piezoelectric stack is deformed and outputs electric energy.

[0009] Preferably, the outer sides of the first magnet and the second magnet are of the same magnetic pole and have the same mounting height, and the inner sides of the first magnet and the second magnet serve as mounting fixing surfaces.

[0010] Preferably, the lever mechanism is at an angle with the inner wall of the cylindrical shell, and the second magnet faces the radial direction of the cylindrical shell when not under stress.

[0011] Preferably, the bracket for mounting the lever mechanism and the piezoelectric stack comprises a side plate and a cylindrical shell body connected perpendicularly to the side plate, a through hole with a diameter smaller than the inner diameter of the cylindrical shell body is arranged at the perpendicular connection position, and the piezoelectric stack with the elastic member is arranged in the cylindrical shell body and is in a pre-compressed state.

[0012] Preferably, the piezoelectric stack with the elastic member comprises a spring, spring support sheets, and a piezoelectric stack, the spring is clamped between the two spring support sheets, one of the spring support sheets is attached to the through hole, and the piezoelectric stack is attached to the other spring support sheet.

[0013] Preferably, the electrodes of the piezoelectric stack are connected to an electric energy collection circuit, and the electric energy generated by the piezoelectric stack when being extruded and deformed is stored through the electric energy collection circuit.

[0014] Preferably, the lever mechanism is fixed to a fixed hinge seat of the side plate through a shaft pin, and the short arm is further provided with a flexible rubber block.

[0015] Preferably, the outer rotating member and the inner rotating member in the cross rotating assembly are both cross structures, the outer rotating member comprises a cross support frame and a hemispherical shell-shaped blade fixed at the end of the cross support frame, and the inner rotating member comprises a cross support frame and a first magnet fixed at the end of the cross support frame.

[0016] Preferably, the rotating shaft and the cover plate of the shell are connected and fixed through a bearing.

[0017] Preferably, the number of the piezoelectric stacks arranged in a ring array in the cylindrical shell is 6-8.

[0018] The utility model has the beneficial effects that:

[0019] This energy harvester utilizes a rotating shaft to drive the first magnet of the inner rotating component in a cross-shaped rotating assembly. The magnetic force generated during this rotation repels the second magnet at one end of a lever mechanism, driving the other end of the lever to apply force to the piezoelectric power generation components. This force is transmitted, causing deformation of the piezoelectric stack, thus outputting electrical energy and converting mechanical energy into electrical energy. Multiple piezoelectric power generation components are arranged in a ring and work collaboratively. The lever mechanism amplifies the force applied to the piezoelectric stack, causing greater deformation. Combined with non-contact magnetic drive force transmission and ring piezoelectric array-lever gain technology, multiple piezoelectric stacks can be simultaneously excited to generate electricity, effectively improving energy harvesting efficiency. Furthermore, the non-contact magnetic drive design effectively avoids mechanical wear problems, achieving 360° omnidirectional energy capture in a compact structure. Attached Figure Description

[0020] Figure 1 This is an exploded structural diagram of a rotating piezoelectric energy harvester.

[0021] Figure 2 This is a schematic diagram of a rotating piezoelectric energy harvester.

[0022] Figure 3 This is a schematic diagram showing the installation relationship between the cross-shaped rotating assembly and the outer cover plate.

[0023] Figure 4 This is a schematic diagram of the internal support structure of the outer shell;

[0024] Figure 5 This is a schematic diagram showing the installation relationship of the piezoelectric power generation component within the housing;

[0025] Figure 6 This is an optional energy harvesting circuit.

[0026] In the diagram: 1-external rotating component, 2-cover plate, 3-rotating shaft, 4-bearing, 5-flexible rubber block, 6-spring support plate, 7-spring, 8-piezoelectric stacking block, 9-cross support frame, 10-cylindrical outer shell, 11-magnet, 12-shaft pin, 13-lever mechanism, 14-cap. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] like Figure 1 As shown, a rotary piezoelectric energy harvester includes a cross-shaped rotating assembly, a piezoelectric power generation assembly, and a cylindrical shell 10. The cross-shaped rotating assembly drives the piezoelectric power generation assembly to generate electricity through non-contact magnetic repulsion. Figure 2The cylindrical shell 10 and its cover plate 2 are made of transparent material to facilitate the display of the internal structure. In fact, the shell does not need to be transparent. The cylindrical shell 10 is connected to the cover plate 2 by screwing. The cover plate has a bearing hole in the center.

[0029] As shown in Figure 2 and Figure 3 , the cross rotating assembly includes an outer rotating part 1, an inner rotating part, and a rotating shaft 3. The rotating shaft 3 penetrates the cover plate of the shell and is connected and fixed to the cover plate of the shell by a bearing 4. The outer rotating part and the inner rotating part are fixed at the two ends of the rotating shaft, respectively. The inner rotating part is suspended in the shell and the shell is sealed. The end of the inner rotating part is provided with a magnet 11. The piezoelectric power generation assembly is packaged in the cylindrical shell and arranged in a ring array. The number of piezoelectric power generation assemblies is preferably six. Each piezoelectric power generation assembly includes a lever mechanism 13, a piezoelectric stack with an elastic member, and a bracket for mounting the lever mechanism and the piezoelectric stack. The long arm end of the lever mechanism is provided with a magnet 11. The magnet moves towards the inner wall of the shell under the magnetic repulsion of the magnet of the inner rotating part, drives the short arm end to press the piezoelectric stack, makes it deform and output electric energy. For the convenience of description, the magnet installed at the end of the inner rotating part is defined as the first magnet, and the magnet installed at the end of the long arm of the lever mechanism is defined as the second magnet. The outer side of the first magnet and the second magnet is of the same magnetic pole and has the same installation height. The inner side of the first magnet and the second magnet serves as the installation and fixing surface. The installation and fixing surface of the first magnet is pasted in the groove at the end of the cross support frame, and the installation and fixing surface of the second magnet is pasted in the groove at the end of the long arm of the lever mechanism. The two magnets can be circular or other shapes. Under the condition of no force, the second magnet faces the radial direction of the cylindrical shell.

[0030] The outer rotating part and the inner rotating part of the cross rotating assembly are both cross structures. The outer rotating part includes a cross support frame and a hemispherical shell-shaped blade fixed at the end of the cross support frame. The inner rotating part includes a cross support frame 9 and a first magnet fixed at the end of the cross support frame.

[0031] As shown in Figure 4 and Figure 5As shown, the bracket for mounting the lever mechanism and piezoelectric stack includes a side plate and a cylindrical housing vertically connected to the side plate. A through hole with a diameter smaller than the inner diameter of the cylindrical housing is provided at the vertical connection. The piezoelectric stack with an elastic element is located inside the cylindrical housing and is in a pre-compressed state. The piezoelectric stack with an elastic element includes a spring 7, a spring support plate 6, and a piezoelectric stack 8. The spring is sandwiched between two spring support plates, one of which is in contact with the through hole, and the piezoelectric stack 8 is in contact with the other spring support plate. It is confined within the cylindrical housing by a cap 14. The lever mechanism is fixed to the fixed hinge seat of the side plate by a pin 12. A flexible rubber block 5 is also installed at the end of the short arm. The flexible rubber block and the pre-compressed spring effectively suppress impact and reduce the risk of the piezoelectric stack brittlely breaking.

[0032] Piezoelectric stacks are typically composed of multiple piezoelectric ceramic sheets stacked together. Each piezoelectric ceramic sheet is thin and has electrodes on its surface to draw out electrical charges. Piezoelectric ceramic materials have a unique crystal structure; when no external force is applied, the centers of positive and negative charges coincide, making the material electrically neutral. When subjected to external pressure, the crystal structure deforms, causing a relative displacement of the centers of positive and negative charges, thus generating charges on the surface of the material. The charge and voltage generated by a single piezoelectric ceramic sheet are typically small. By stacking multiple piezoelectric ceramic sheets, when an external force is applied to the entire stack, each sheet produces a piezoelectric effect, and the charges and voltages generated are superimposed, resulting in a larger charge and higher output voltage. This improves the piezoelectric conversion efficiency and meets the power output requirements of practical applications. The electrodes of the piezoelectric stack are connected to an energy harvesting circuit, and the electrical energy generated as the piezoelectric stack is deformed by pressure is stored through this circuit.

[0033] like Figure 6 The diagram shows an optional energy harvesting circuit. The electrical energy generated by the six piezoelectric generators is converted into DC power through a rectifier and voltage regulator circuit. The rectifier and voltage regulator circuit mainly includes a bridge rectifier circuit (rectifier module), a filter capacitor, a voltage regulator, and a load.

[0034] A bridge rectifier circuit converts alternating current (AC) generated by piezoelectric stacks into direct current (DC). The polarity of the charge generated by the piezoelectric stacks due to external forces changes over time, resulting in an AC output signal, while most loads require DC power. The bridge rectifier circuit utilizes the unidirectional conductivity of four diodes to ensure that current flows through the load in the same direction regardless of the polarity of the input AC voltage, thus achieving rectification.

[0035] Filter capacitors are used to smooth the rectified DC voltage, reducing voltage ripple and storing electrical energy. Although a bridge rectifier circuit can convert AC to DC, the output DC voltage will fluctuate, exhibiting ripple. Filter capacitors reduce voltage fluctuations by storing charge when the voltage rises and releasing charge when the voltage falls, resulting in a more stable output voltage. The principle of a filter capacitor is as follows: when the rectified voltage is higher than the voltage across the capacitor, the capacitor is charged, storing electrical energy; when the rectified voltage is lower than the voltage across the capacitor, the capacitor discharges, providing current to the load, thus smoothing the voltage. The larger the capacitor's capacitance, the better the filtering effect, and the closer the output DC voltage will be to an ideal smooth DC voltage.

[0036] Voltage regulators are used to stabilize the output voltage, making it unaffected by input voltage fluctuations, load changes, or environmental factors, thus providing a stable power supply to the load. Although the filtered DC voltage is smoothed out, it may still fluctuate due to factors such as the instability of the piezoelectric stack output and load changes. Voltage regulators can limit such fluctuations to a very small range, ensuring that the output voltage remains at a fixed value or within a very small allowable range.

[0037] The load can be various sensors that operate at the circuit's input voltage.

[0038] The working process and working principle of this utility model are as follows:

[0039] When the energy harvester is placed in water or wind, and the water is still or there is no wind, the external rotating parts do not rotate, the device remains stationary, and the energy harvester does not generate electricity.

[0040] If there is water flow or wind, the water flow or wind will drive the external rotating component 1 to rotate. The rotating shaft 3 will rotate under the drive of the external rotating component 1, causing the cross support frame 9 and the magnet 11 on it to rotate around the axis. When the magnet 11 approaches the magnet at one end of the lever 13, a magnetic repulsion will be generated, driving the lever 131 to move. Through the leverage effect, the force is effectively amplified, and the flexible rubber block 5 at the other end of the lever 13 applies a force to the spring support frame 6, which is transmitted to the piezoelectric stack 8, causing it to deform and output electrical energy.

[0041] The energy harvester provided by this invention utilizes non-contact magnetic drive force transmission and ring piezoelectric array-lever gain technology to efficiently convert rotating mechanical energy into electrical energy, and is suitable for powering wind power, hydropower generation, and wireless sensor networks.

[0042] The above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A rotary piezoelectric energy harvester, characterized in that, It includes a cross-shaped rotating assembly, a piezoelectric power generation assembly, and a cylindrical outer shell. The cross-shaped rotating assembly drives the piezoelectric power generation assembly to generate electricity through non-contact magnetic repulsion. The cross-rotation assembly includes an outer rotating component, an inner rotating component, and a rotating shaft. The rotating shaft passes through the outer shell cover plate. The outer rotating component and the inner rotating component are respectively fixed at both ends of the rotating shaft. The inner rotating component is suspended inside the outer shell, and the inner shell is sealed. A first magnet is provided at the end of the inner rotating component. The piezoelectric power generation component is encapsulated in a cylindrical shell and arranged in a ring array. It includes a lever mechanism, piezoelectric stack blocks with elastic elements, and a bracket for mounting the lever mechanism and piezoelectric stack blocks. The long arm of the lever mechanism is provided with a second magnet. Under the magnetic repulsion of the first magnet, the second magnet moves towards the inner wall of the shell, causing the short arm to squeeze the piezoelectric stack blocks, causing them to deform and output electrical energy.

2. A rotary piezoelectric energy harvester according to claim 1, characterized in that, The outer surfaces of the first and second magnets have the same magnetic poles and are installed at the same height, while the inner surfaces of the first and second magnets serve as the mounting and fixing surfaces.

3. A rotary piezoelectric energy harvester according to claim 1, characterized in that, The lever mechanism is at a certain angle to the inner wall of the cylindrical shell, and when no force is applied, the second magnet is directed toward the radial direction of the cylindrical shell.

4. A rotary piezoelectric energy harvester according to claim 1, characterized in that, The bracket for mounting the lever mechanism and piezoelectric stack includes a side plate and a cylindrical housing vertically connected to the side plate. The vertical connection has a through hole with a diameter smaller than the inner diameter of the cylindrical housing. The piezoelectric stack with elastic elements is located inside the cylindrical housing and is in a pre-compressed state.

5. A rotary piezoelectric energy harvester according to claim 4, characterized in that, The piezoelectric stack with attached elastic element includes a spring, a spring support plate, and a piezoelectric stack. The spring is sandwiched between two spring support plates, one of which is in contact with the through hole, and the piezoelectric stack is in contact with the other spring support plate.

6. A rotary piezoelectric energy harvester according to claim 5, characterized in that, The electrodes of the piezoelectric stack are connected to an energy harvesting circuit, and the electrical energy generated as the piezoelectric stack is squeezed and deformed is stored through the energy harvesting circuit.

7. A rotary piezoelectric energy harvester according to claim 4, characterized in that, The lever mechanism is fixed to the fixed hinge seat on the side plate by a pivot pin, and a flexible rubber block is also installed at the end of the short arm.

8. A rotary piezoelectric energy harvester according to claim 1, characterized in that, Both the outer and inner rotating components of the cross rotating assembly are cross-shaped. The outer rotating component includes a cross support frame and a hemispherical shell-shaped blade fixed to the end of the cross support frame. The inner rotating component includes a cross support frame and a first magnet fixed to the end of the cross support frame.

9. A rotary piezoelectric energy harvester according to claim 1, characterized in that, The rotating shaft is fixed to the outer casing cover plate by bearings.

10. A rotary piezoelectric energy harvester according to claim 1, characterized in that, The number of piezoelectric stack blocks arranged in a ring array inside the cylindrical shell is 6-8.

Images