Piezoelectric power generation system that recycles gravitational potential energy

Abstract

The present invention discloses a piezoelectric power generation system for recovering gravitational potential energy, including a frame, a motor, a lifting shaft, a ratchet power generation device and a support bearing, wherein the motor, the lifting shaft, the ratchet power generation device and the support bearing are sequentially connected by an axial connection, the lifting shaft is wound with a rope, the motor and the support bearing are fixed on the frame, and both ends of the lifting shaft are provided with a support structure fixed to the frame; the ratchet power generation device includes an inner ring, an outer ring and a piezoelectric power generation group; the sleeve extends from the outer ring to the support bearing to support the ratchet power generation device. The system can be used to recover the gravitational potential energy when the goods are lowered, and convert it from the gravitational potential energy to electrical energy through a special rotary piezoelectric effect. The system can be set on elevators, cranes, and lifts to recycle the gravitational potential energy lost when the lifting objects are lowered, so as to make full use of the energy.

Description

Technical Field

[0001] The invention belongs to the field of power generation devices, and in particular relates to a piezoelectric power generation system for recovering gravitational potential energy. Background Art

[0002] In order to recover the gravitational potential energy generated by elevators, lifts, cranes, etc., many scholars at home and abroad have proposed using the principles of electromagnetic induction, piezoelectric effect, frictional electric effect, etc. to convert gravitational potential energy into electrical energy, and have designed a variety of power generation devices to achieve the effect of energy recovery. At present, the power generation devices are all equipped with magnets on both sides of the transportation channel. When the goods are transported up and down, they cut the magnetic lines of force and generate induced electromotive force, thereby achieving the effect of power generation.

[0003] Most of the existing elevators, cranes, and lifts recycle gravity potential energy to generate electricity. They choose to install magnets directly on both sides of the transportation channel, treating the goods as conductors and using the goods to cut the magnetic flux lines during the rising and falling process to generate electricity. In this way, the electric potential energy generated by reciprocating motion is low, which makes its energy recovery rate low and causes excessive energy waste. Traditional devices can only cut the magnetic flux lines to generate electromotive force when the goods can be used as conductors. When the goods are insulators, they will not be able to generate electricity, and the scope of application is not wide enough. In addition, the size of traditional power generation devices is too large, and the increase in the volume of the power generation device will greatly reduce its output power density (the ratio of output power to its working volume), which will also bring about the defects of increased manufacturing costs, excessive bulkiness, and unsuitability for recycling gravity power generation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a piezoelectric power generation system for recovering gravitational potential energy. The system can be used to recover the gravitational potential energy when the goods are lowered, and convert it into electrical energy through a special rotary piezoelectric effect. The system can be installed on elevators, cranes, and lifts to recover the gravitational potential energy lost when the lifted objects are lowered, making full use of the energy.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A piezoelectric power generation system for recovering gravitational potential energy, the piezoelectric power generation system comprising a frame, a motor, a lifting shaft, a ratchet power generation device and a support bearing, the motor, the lifting shaft and the ratchet power generation device are sequentially connected by an axial connection, the lifting shaft is wound with a rope, the motor and the support bearing are fixed on the frame, and both ends of the lifting shaft are provided with a support structure fixed to the frame; the ratchet power generation device comprises an inner ring, an outer ring and a piezoelectric power generation group; wherein,

[0007] The outer ring is a cylindrical structure with one end open and the other end closed and connected to the lifting shaft in an axial connection manner; an inner column is provided at the center of the inner wall of the closed end of the outer ring, and at least two groups of magnets are evenly arranged on the surface of the inner column along the circumferential direction; a plurality of helical teeth are evenly arranged on the inner surface of the side wall of the outer ring along the circumferential direction, and a group of radially arranged magnets are provided on the surface of each helical tooth facing the inner column;

[0008] The inner ring is cylindrical, and a sleeve is provided inside the inner ring that is concentric with and matched with the inner column, and the sleeve is supported and fixed to the inner ring; a paddle groove is provided on the surface of the inner ring, and a paddle is installed in the paddle groove, and at least two groups of piezoelectric power generation groups are provided in the other areas of the surface of the inner ring along the circumferential direction, and the piezoelectric power generation groups include a piezoelectric component, and the piezoelectric component is fixedly connected to the inner ring, one end of the piezoelectric component faces the inner ring, and the other end faces the inner column; the sleeve extends out of the outer ring to the support bearing to support the ratchet power generation device.

[0009] In a specific embodiment, the piezoelectric component includes a cantilever beam, a piezoelectric sheet and two magnets. The piezoelectric sheet is attached to the cantilever beam, and the two magnets are respectively fixed at two ends of the cantilever beam.

[0010] In a specific embodiment, a rectangular groove is provided on the inner ring, and the middle position of the cantilever beam of the piezoelectric component is fixedly connected to the rectangular groove.

[0011] In a specific embodiment, the number of piezoelectric sheets of the piezoelectric assembly is 4, and the 4 piezoelectric sheets are symmetrically attached to the upper and lower surfaces of the cantilever beam along the middle position of the cantilever beam.

[0012] In a specific embodiment, the polarities of the end faces of the magnet of the piezoelectric component and the magnet of the outer ring facing each other are the same.

[0013] In a specific embodiment, each of the piezoelectric power generation groups includes three piezoelectric components, and the three piezoelectric components are arranged along the radial direction of the inner ring.

[0014] In one specific embodiment, each set of magnets on the outer ring includes three magnets.

[0015] In a specific embodiment, there are three groups of magnets on the surface of the inner column.

[0016] The present invention has the following beneficial effects:

[0017] 1. Use the gravitational potential energy of heavy objects to drive the piezoelectric generator, and then drive multiple moving electrodes to vibrate and generate electricity.

[0018] 2. Multiple cantilever beam blades are arranged on the inner ring to improve the output power density.

[0019] 3. Piezoelectric sheets are arranged on the upper and lower surfaces of the cantilever beam, and the deformation of the cantilever beam is fully utilized to generate electricity based on the piezoelectric effect.

[0020] 4. Clever use of the ratchet mechanism, using ratchet mechanisms with different load standards, allows power generation when transporting large and small goods. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A diagram showing the structure and working principle of a piezoelectric power generation system for recovering gravitational potential energy according to an embodiment of the present invention;

[0022] Figure 2 This is a working principle diagram of the ratchet power generation device in conjunction with the transportation of cargo;

[0023] Figure 3 This is a schematic diagram of the explosion of the ratchet power generation device;

[0024] Figure 4 It is a schematic diagram of the structure of the outer ring;

[0025] Figure 5 It is the structural diagram and explosion diagram of the piezoelectric component;

[0026] Figure 6 The working principle diagram of the piezoelectric component. DETAILED DESCRIPTION

[0027] 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 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.

[0028] Reference Figures 1 to 6 The present invention discloses a piezoelectric power generation system for recovering gravitational potential energy, the piezoelectric power generation system comprises a frame 10, a motor 11, a lifting shaft 12, a ratchet power generation device 30 and a support bearing 15, wherein the motor 11, the lifting shaft 12 and the ratchet power generation device 30 are sequentially connected by shaft connection. The lifting shaft 12 is wound with a rope 13 (the rope is used to carry goods 14), the motor 11 and the support bearing 15 are fixed to the frame 10 (for example, fixed by a bracket), and both ends of the lifting shaft 12 are provided with a support structure fixed to the frame 10 (for the sake of simplicity in explaining the working principle, the support structure is not shown in the figure, for example, a bracket and a bearing support method can be adopted).

[0029] The ratchet power generation device 30 includes an inner ring 4, an outer ring 3 and a piezoelectric power generation group.

[0030] The outer ring 3 is a cylindrical structure with one end open and the other end closed and connected to the lifting shaft 12 in an axial connection. An inner column 5 is provided at the center of the inner wall of the closed end of the outer ring 3, and at least two groups of magnet groups are evenly arranged on the surface of the inner column 5 along the circumferential direction. For example, in a specific embodiment, 6 groups of magnet groups are evenly distributed on the surface of the inner column 5 at a circumferential interval of 60 degrees, and each group of magnet groups has 3 magnets. A plurality of helical teeth 2 are evenly arranged on the inner surface of the side wall of the outer ring 3 along the circumferential direction, and each helical tooth 2 is provided with a group of radially arranged magnets (for example, 3 magnets) on the surface facing the inner column 5.

[0031] The inner ring 4 is cylindrical, and a sleeve 21 is provided inside the inner ring 4, which is concentric with and matched with the inner column 5. The sleeve 21 is supported and fixed to the inner ring 4 by the support portion 6. A paddle groove 22 is provided on the surface of the inner ring 4, and a paddle 23 is installed in the paddle groove 22. At least two piezoelectric power generation groups are provided along the circumferential direction in other areas of the surface of the inner ring 4. The piezoelectric power generation group includes a piezoelectric component 8, which is fixedly connected to the inner ring 4, with one end of the piezoelectric component 8 facing the inner ring 4 and the other end facing the inner column 5. The sleeve 21 extends out of the outer ring 3 to the support bearing 15 to support the ratchet power generation device 30.

[0032] In a specific embodiment, five groups of rectangular grooves 7 are evenly arranged along the circumference of the inner ring 4 (at intervals of 60 degrees at the central angle), and each group has three rectangular grooves 7 arranged along the radial direction of the inner ring 4. Correspondingly, three piezoelectric components 8 arranged in the radial direction constitute a group of piezoelectric power generation groups. One piezoelectric component 8 is fixedly connected with the inner ring 4 through the rectangular groove 7, that is, the middle part of the power generation component 8 forms an interference fit with the rectangular groove 7. The piezoelectric components 8 correspond to the rectangular grooves 7 one by one, and a total of five groups, i.e., 15 piezoelectric components 8, are installed on the inner ring 4.

[0033] The piezoelectric assembly 8 includes a cantilever beam 81 (a brass sheet may be used), four piezoelectric sheets 82 and two magnets 83. The cantilever beam 81 is a brass sheet with a thickness of 0.4 mm. The middle of the cantilever beam 81 is fixedly connected to the rectangular groove 7 of the inner ring 4. A magnet 83 is installed on each of the two free ends of the cantilever beam 81. Four piezoelectric sheets 82 are symmetrically attached to the upper and lower surfaces of the cantilever beam 81 along the middle position.

[0034] The working principle of the piezoelectric power generation system described in the present invention ( Figure 2The rope 13 and the cargo 14 are shown together only for the purpose of illustrating the working principle, and it does not mean that there is any assembly relationship between the rope 13 and the cargo 14), as described below. When the motor 11 drives the lifting shaft 12 to rotate so that the cargo 14 carried by the rope 13 rises, the outer ring 3 of the ratchet power generation device 30 moves counterclockwise, and the paddle 23 drives the inner ring 4 to rotate synchronously without generating electricity. When the motor 11 drives the lifting shaft 12 to rotate so that the cargo 14 carried by the rope 13 falls, the outer ring 3 of the ratchet power generation device 30 moves clockwise, and the paddle 23 does not drive the inner ring 4, so that the outer ring 3 and the inner ring 4 rotate relative to each other. There are gaps between the piezoelectric power generation group installed on the inner ring 4 and the helical teeth 2 of the outer ring 3, and between the piezoelectric power generation group and the surface of the inner column 5. When the inner ring 4 and the outer ring 3 rotate relative to each other, the magnets 83 at both ends of the cantilever beam 81 interact with the magnets on the helical teeth 2 of the outer ring 3 and the magnets on the inner column 5 respectively. Under the action of magnetic force, the cantilever beam 81 will deform, thereby causing the piezoelectric sheet 82 attached to the surface of the cantilever beam 81 to deform. According to the positive piezoelectric effect, the piezoelectric sheet under pressure (or tension) will output electrical energy.

[0035] The specific vibration power generation process of the piezoelectric component 8 is as follows. When the inner ring 4 and the outer ring 3 rotate relative to each other, the magnet 84 on the outer ring 3 vibrates up and down relative to the magnet 83 of the piezoelectric component 8. When the magnet 84 on the outer ring 3 approaches the magnet 83 on the cantilever beam 81, an interaction force is generated between the magnets, and this force drives the cantilever beam 81 to bend. When the magnet 83 continues to move relative to the cantilever beam and gradually moves away from the cantilever beam, the force weakens and the cantilever beam 81 is released. After being released, the cantilever beam 81 will vibrate freely at its natural frequency. The rotation frequency of the lifting shaft 12 is usually low, but during the rotation of the lifting shaft 12, the cantilever beam 81 will vibrate freely at its natural frequency every time it is moved by the magnet 84 on the outer ring 3, and this natural frequency is much higher than the rotation frequency of the lifting shaft 12. This achieves an increase in frequency, and ultimately can achieve an increase in the output power and energy conversion efficiency of the piezoelectric power generation device.

[0036] There are not many applications of piezoelectric technology that can be truly utilized in my country, so in-depth research and development of devices suitable for gravitational potential energy piezoelectric power generation can effectively utilize the piezoelectric effect to generate electricity and achieve more reasonable and effective use of resources.

[0037] It should be understood that the exemplary embodiments described herein are illustrative rather than restrictive. Although one or more embodiments of the present invention have been described in conjunction with the accompanying drawings, it should be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A piezoelectric power generation system for recovering gravitational potential energy, characterized in that: The piezoelectric power generation system comprises a frame, a motor, a lifting shaft, a ratchet power generation device and a support bearing, wherein the motor, the lifting shaft and the ratchet power generation device are sequentially connected by an axial connection, a rope is wound around the lifting shaft, the motor and the support bearing are fixed on the frame, and support structures fixed to the frame are provided at both ends of the lifting shaft; the ratchet power generation device comprises an inner ring, an outer ring and a piezoelectric power generation group; in, The outer ring is a cylindrical structure with one end open and the other end closed and connected to the lifting shaft in an axial connection manner; an inner column is provided at the center of the inner wall of the closed end of the outer ring, and at least two groups of magnets are evenly arranged on the surface of the inner column along the circumferential direction; a plurality of helical teeth are evenly arranged on the inner surface of the side wall of the outer ring along the circumferential direction, and a group of radially arranged magnets are provided on the surface of each helical tooth facing the inner column; The inner ring is cylindrical, and a sleeve is provided inside the inner ring that is concentric with and matched with the inner column, and the sleeve is supported and fixed to the inner ring; a paddle groove is provided on the surface of the inner ring, and a paddle is installed in the paddle groove; at least two groups of piezoelectric power generation groups are provided in the other areas of the surface of the inner ring along the circumferential direction, and the piezoelectric power generation groups include a piezoelectric component, and the piezoelectric component is fixedly connected to the inner ring, with one end of the piezoelectric component facing the inner ring and the other end facing the inner column; the sleeve extends out of the outer ring to the support bearing to support the ratchet power generation device; The piezoelectric component includes a cantilever beam, a piezoelectric sheet and two magnets, the piezoelectric sheet is attached to the cantilever beam, and the two magnets are respectively fixed at both ends of the cantilever beam; Each of the piezoelectric power generation groups includes three piezoelectric components, and the three piezoelectric components are arranged along the radial direction of the inner ring.

2. The piezoelectric power generation system for recovering gravitational potential energy according to claim 1, characterized in that: A rectangular groove is provided on the inner ring, and the middle position of the cantilever beam of the piezoelectric component is fixedly connected to the rectangular groove.

3. The piezoelectric power generation system for recovering gravitational potential energy according to claim 2, characterized in that: The number of piezoelectric sheets of the piezoelectric assembly is 4, and the 4 piezoelectric sheets are symmetrically attached to the upper and lower surfaces of the cantilever beam along the middle position of the cantilever beam.

4. The piezoelectric power generation system for recovering gravitational potential energy according to claim 3, characterized in that: The polarities of the end faces of the magnet of the piezoelectric component and the magnet of the outer ring facing each other are the same.

5. The piezoelectric power generation system for recovering gravitational potential energy according to claim 1, characterized in that: Each set of magnets on the outer ring includes three magnets.

6. The piezoelectric power generation system for recovering gravitational potential energy according to claim 1, characterized in that: There are three groups of magnets on the surface of the inner column.

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