Magnetic levitation composite piezoelectric energy harvester

Abstract

The application discloses a kind of magnetic levitation composite piezoelectric energy harvester and energy capturing method, belong to renewable energy field.Magnetic levitation composite piezoelectric energy harvester includes magnetoelectric mechanism, bottom plate and piezoelectric mechanism, bottom plate middle is fixedly connected with magnetoelectric mechanism by bolt, and bottom plate around is fixedly connected with piezoelectric mechanism by bolt.The application improves the utilization rate of piezoelectric material, increases energy capture efficiency, realizes higher energy output, and it can produce resonance under the vibration excitation of wider frequency range, thereby greatly improving the efficiency of wideband energy collection, solve the existing vibration energy capturing device energy conversion efficiency low, piezoelectric material utilization rate is lower, vibration capture frequency bandwidth range is narrower.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of piezoelectric energy harvesting technology and renewable energy, and particularly relates to a magnetic suspension composite piezoelectric energy harvester. BACKGROUND

[0002] Since the 21st century, in order to solve the problem of reliable and durable power supply of low-power wireless sensor network (WSN) or mobile electronic device, energy harvesting (EH) is becoming a frontier technology field of common concern in academia and industry. Vibration in natural environment is almost everywhere, and it is not limited by use time and service environment like solar energy and electromagnetic energy. Mechanical vibration energy is one of the widely available energy in the environment, so vibration energy is widely studied. Among them, piezoelectric vibration energy harvesting has attracted attention from all walks of life because of its high force-electric coupling effect and energy density, no electromagnetic interference, and easy miniaturization integration.

[0003] In practical application, environmental vibration has instability. When the frequency and vibration direction of the vibration source do not match the energy collection device, the energy collected by the energy collection device will be very low, which will seriously affect the collection efficiency, thereby limiting the effect of the energy collection device. The traditional piezoelectric energy harvesting device has a fixed vibration collection frequency band and a narrow bandwidth range. In addition, the utilization rate of piezoelectric material of the traditional piezoelectric energy harvesting device still needs to be improved. Most of the existing vibration energy collection devices have these problems, so there is an urgent need for a magnetic suspension composite piezoelectric energy harvester to solve the above problems. SUMMARY

[0004] In view of the existing problems, the present application aims to provide a magnetic suspension composite piezoelectric energy harvester to solve the problems in the background art. The present application has reasonable structure and good working effect.

[0005] The present application is a magnetic suspension composite piezoelectric energy harvester, which comprises a magnetoelectric mechanism, a bottom plate and a piezoelectric mechanism, characterized in that the magnetoelectric mechanism is fixedly connected in the middle of the bottom plate by bolts, and the piezoelectric mechanism is fixedly connected around the bottom plate by bolts.

[0006] The magnetoelectric mechanism comprises a big magnet upper chuck, an optical shaft, an intermediate bearing, an upper bearing sleeve, a lower bearing sleeve, a first magnet, a second magnet, a third magnet, a fourth magnet, a big magnet lower chuck, a lower lower chuck, an upper coil and a lower coil, the bottom plate is provided with the optical shaft, the big magnet upper chuck is sleeved on the optical shaft and is fixedly connected by bolts, the upper coil is wound on the big magnet upper chuck, the first magnet is fixedly connected on the big magnet upper chuck by bolts, the intermediate bearing is sleeved on the optical shaft, the upper bearing sleeve is sleeved on the intermediate bearing, the lower bearing sleeve is sleeved on the intermediate bearing, the second magnet is sleeved on the upper bearing sleeve, the third magnet is sleeved on the lower bearing sleeve, the big magnet lower chuck is sleeved on the optical shaft and is fixedly connected on the front surface of the bottom plate by bolts, the lower coil is wound on the big magnet lower chuck, the fourth magnet is fixedly connected on the big magnet lower chuck by bolts, and the lower lower chuck is sleeved on the optical shaft and is fixedly connected on the back surface of the bottom plate by bolts.

[0007] The piezoelectric mechanism is provided with six groups, and comprises a thin pad, a pad, a piezoelectric beam and a piezoelectric sheet, the pad is fixedly connected on the front surface of the bottom plate by bolts, the thin pad is fixedly connected on the pad by bolts, the piezoelectric beam is clamped by the thin pad and the pad, and the piezoelectric sheet is pasted on the piezoelectric beam, so that the frequency band is greatly widened, the power generation is increased, the utilization rate of the piezoelectric material is improved, the energy capture efficiency is increased, and high energy output is realized.

[0008] Preferably, the piezoelectric mechanism is provided with six groups and is arranged in a ring array with an interval of 60°.

[0009] Preferably, the first magnet and the second magnet of the magnetoelectric mechanism are of the same polarity, the second magnet and the third magnet of the magnetoelectric mechanism are of different polarities, the third magnet and the fourth magnet of the magnetoelectric mechanism are of the same polarity, the first magnet and the fourth magnet are fixed magnets, and the second magnet and the third magnet are moving magnets.

[0010] Preferably, the second magnet and the third magnet are gap-fitted, and the second magnet and the third magnet clamp the piezoelectric beam.

[0011] Preferably, the piezoelectric beam is made of brass, and the piezoelectric sheet is made of piezoelectric ceramic.

[0012] The preferable specific energy capturing method comprises the following steps: firstly, installing the base plate on a platform which can collect vibration, when the platform starts to vibrate up and down and left and right, the base plate vibrates under the drive of the platform, the thin cushion block on the base plate also vibrates, so that the piezoelectric beam clamped generates vibration, the piezoelectric sheet on the piezoelectric beam is forced to deform to generate electric energy, at the same time of vibration, the second magnet and the third magnet are moving magnets, the first magnet and the fourth magnet are fixed magnets, the moving magnets are opposite to the fixed magnets with the same polarity, the first magnet is fixedly connected on the upper chuck of the big magnet through bolts, the fourth magnet is fixedly connected on the lower chuck of the big magnet through bolts, the second magnet is sleeved on the middle bearing through the upper bearing sleeve, the third magnet is sleeved on the middle bearing through the lower bearing sleeve, when the moving magnets are excited by the vibration in the external environment, the magnetic force of the moving magnets changes, the moving magnets reciprocate along the optical axis to drive the piezoelectric beam to deform.

[0013] Compared with the prior art, the application has the following beneficial effects:

[0014] 1、The piezoelectric beam and the piezoelectric sheet are matched to realize the conversion of vibration energy in the environment into electric energy through the positive piezoelectric effect, the coil and the movable magnet are matched to realize the conversion of vibration energy in the environment into electric energy through electromagnetic induction, the non-linear magnetic force of the magnet, the induced electric potential of the coil and the induced current in the piezoelectric sheet form the multi-stable state of the energy capturing device, the collection frequency band of the energy capturing device is widened, the collection efficiency of the energy capturing device is improved, the installation is simple, stable and reliable, and the energy capturing device is not easily disturbed by the external environment.

[0015] 2、The piezoelectric mechanism adopts a ring array, so the power generation capacity is large, and the mass block is replaced by the magnetoelectric mechanism, so that the piezoelectric mechanism is not limited by the inertia of the mass block and deforms rapidly, and the output voltage of the piezoelectric sheet is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a structural schematic view of the present application;

[0018] Figure 2 It is a top view of the present application;

[0019] Figure 3 It is a bottom view of the present application;

[0020] Figure 4 It is a schematic view of the magnetoelectric mechanism of the present application;

[0021] Figure 5 A schematic view of a magnetoelectric mechanism of the present application;

[0022] Figure 6 A schematic view of a piezoelectric mechanism of the present application.

[0023] In the figure: 1 upper chuck of large magnet, 2 optical shaft, 3 intermediate bearing, 4 upper bearing sleeve, 5 lower bearing sleeve, 6

[0024] First magnet, 7 second magnet, 8 third magnet, 9 fourth magnet, 10 lower chuck of large magnet, 11 lower lower chuck, 12 upper coil, 13 lower coil, 14 magnetoelectric mechanism, 15 bottom plate, 16 thin pad, 17 pad, 18 piezoelectric beam, 19 piezoelectric sheet, 20 piezoelectric mechanism. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0026] Please refer to Figures 1-6 A magnetic suspension composite piezoelectric energy harvester, comprising a magnetoelectric mechanism 14, a bottom plate 15 and a piezoelectric mechanism 20, characterized in that the magnetoelectric mechanism 14 is fixedly connected in the middle of the bottom plate 15 by bolts, and the piezoelectric mechanism 20 is fixedly connected around the bottom plate 15 by bolts; the magnetoelectric mechanism 14 comprises an upper chuck 1 of large magnet, an optical shaft 2, an intermediate bearing 3, an upper bearing sleeve 4, a lower bearing sleeve 5, a first magnet 6, a second magnet 7, a third magnet 8, a fourth magnet 9, a lower chuck 10 of large magnet, a lower lower chuck 11, an upper coil 12 and a lower coil 13, an optical shaft 2 is inserted in the middle of the bottom plate 15, the upper chuck 1 of large magnet is sleeved on the optical shaft 2 and fixedly connected by bolts, the upper coil 12 is wound on the upper chuck 1 of large magnet, the first magnet 6 is fixedly connected on the upper chuck 1 of large magnet by bolts, the intermediate bearing 3 is sleeved on the optical shaft 2, the intermediate bearing 3 is sleeved with the upper bearing sleeve 4, the intermediate bearing 3 is sleeved with the lower bearing sleeve 5, the second magnet 7 is sleeved with the upper bearing sleeve 4, the third magnet 8 is sleeved with the lower bearing sleeve 5, the lower chuck 10 of large magnet is sleeved on the optical shaft 2 and fixedly connected on the front surface of the bottom plate 15 by bolts, the lower coil 13 is wound on the lower chuck 10 of large magnet, the fourth magnet 9 is fixedly connected on the lower chuck 10 of large magnet by bolts, and the lower lower chuck 11 is sleeved on the optical shaft 2 and fixedly connected on the back surface of the bottom plate 15 by bolts; the piezoelectric mechanism 20 is provided with six groups of the same structure, comprising a thin pad 16, a pad 17, a piezoelectric beam 18 and a piezoelectric sheet 19, the pad 17 is fixedly connected on the front surface of the bottom plate 15 by bolts, the thin pad 16 is fixedly connected on the pad 17 by bolts, the piezoelectric beam 18 is clamped by the thin pad 16 and the pad 17, and the piezoelectric sheet 19 is pasted on the piezoelectric beam 18, which greatly widens the frequency band and increases the power generation. Because the upper coil is wound on the upper chuck of large magnet and the lower coil is wound on the lower chuck of large magnet, the utilization rate of piezoelectric material is improved, the energy harvesting efficiency is increased, and high energy output is achieved.

[0027] The piezoelectric mechanism 20 is provided with six groups in the same way, and is arranged in a ring array with an interval of 60°.

[0028] The first magnet 6 and the fourth magnet 9 are fixed magnets, and the second magnet 7 and the third magnet 8 are moving magnets.

[0029] The second magnet 7 and the third magnet 8 are gap fitted, and the second magnet 7 and the third magnet 8 clamp the piezoelectric beam 18.

[0030] The piezoelectric beam 18 is made of brass, and the piezoelectric sheet 19 is made of piezoelectric ceramic.

[0031] The specific energy trapping method comprises the following steps: first, the base plate 15 is installed on a platform that can collect vibration from the outside world; when the platform starts to vibrate up and down and left and right, the base plate 15 vibrates under the drive of the platform, and the thin pad 16 and the pad 17 on the base plate 15 also vibrate, so that the clamped piezoelectric beam 18 vibrates, forcing the piezoelectric sheet 19 on the piezoelectric beam 18 to deform and generate electric energy; at the same time of vibration, the other end of the piezoelectric beam 18 is placed between the second magnet 7 and the third magnet 8, the second magnet 7 and the third magnet 8 are moving magnets, the first magnet 6 and the fourth magnet 9 are fixed magnets, the moving magnets are opposite to the fixed magnets, the first magnet 6 is fixedly connected to the upper chuck 1 of the large magnet through a bolt, the fourth magnet 9 is fixedly connected to the lower chuck 10 of the large magnet through a bolt, the second magnet 7 is sleeved on the middle bearing 3 through the upper bearing sleeve 4, and the third magnet 8 is sleeved on the middle bearing 3 through the lower bearing sleeve 5; when excited by vibration from the outside environment, the magnetic force acting on the moving magnets changes, and the moving magnets reciprocate up and down along the optical axis 2, driving the piezoelectric beam 18 to deform.

[0032] In summary: the magnetic suspension composite piezoelectric energy trapping device solves the problem of narrow working frequency band in general vibration energy collection through the cooperation of the upper chuck of the large magnet, the optical axis, the middle bearing, the upper bearing sleeve, the lower bearing sleeve, the first magnet, the second magnet, the third magnet, the fourth magnet, the lower chuck of the large magnet, the lower lower chuck, the upper coil, the lower coil, the magnetoelectric mechanism, the base plate, the thin pad, the pad, the piezoelectric beam, the piezoelectric sheet, and the piezoelectric mechanism, improves the energy collection efficiency, increases the power generation capacity, and improves the stability of energy recovery.

[0033] The above merely illustrates the embodiments of the present application but should not be taken as limitations. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A magnetically levitated composite piezoelectric energy harvester, comprising a magnetoelectric mechanism (14), a base plate (15), and a piezoelectric mechanism (20), characterized in that: A magnetoelectric mechanism (14) is fixedly connected to the middle of the base plate (15) by bolts, and a piezoelectric mechanism (20) is fixedly connected to the periphery of the base plate (15) by bolts. The magnetoelectric mechanism (14) includes a large magnet upper chuck (1), an optical shaft (2), an intermediate bearing (3), an upper bearing sleeve (4), a lower bearing sleeve (5), a first magnet (6), a second magnet (7), a third magnet (8), a fourth magnet (9), a large magnet lower chuck (10), a lower lower chuck (11), an upper coil (12), and a lower coil (13). An optical shaft (2) is inserted into the middle of the base plate (15). A large magnet upper chuck (1) is fitted onto the optical shaft (2) and fixedly connected to it with bolts. An upper coil (12) is wound around the large magnet upper chuck (1). The first magnet (6) is fixedly connected to the large magnet upper chuck (1) with bolts. An intermediate bearing (3) is fitted on the optical axis (2), an upper bearing sleeve (4) is fitted on the intermediate bearing (3), a lower bearing sleeve (5) is fitted on the intermediate bearing (3), a second magnet (7) is fitted on the upper bearing sleeve (4), a third magnet (8) is fitted on the lower bearing sleeve (5), a large magnet lower chuck (10) is fitted on the optical axis (2) and fixed to the front of the base plate (15) by bolts, a lower coil (13) is wound on the large magnet lower chuck (10), a fourth magnet (9) is fixed to the large magnet lower chuck (10) by bolts, and a lower lower chuck (11) is fitted on the optical axis (2) and fixed to the back of the base plate (15) by bolts; The piezoelectric mechanism (20) is provided with six sets of equal components, including thin pads (16), pads (17), piezoelectric beams (18) and piezoelectric sheets (19). The pads (17) are fixedly connected to the front of the base plate (15) by bolts. The pads (17) are fixedly connected to the thin pads (16) by bolts. The thin pads (16) and pads (17) clamp the piezoelectric beams (18). The piezoelectric sheets (19) are attached to the piezoelectric beams (18). The specific energy harvesting method includes the following steps: First, the base plate (15) is installed on an external platform where vibration can be collected. When the platform begins to vibrate up and down and left and right, the base plate (15) vibrates under the influence of the platform. The thin pads (16) and pads (17) on the base plate (15) also vibrate, thereby causing the piezoelectric beam (18) to vibrate. This forces the piezoelectric sheet (19) on the piezoelectric beam (18) to deform and generate electrical energy. At the same time as the vibration, since the other end of the piezoelectric beam (18) is placed between the second magnet (7) and the third magnet (8), the second magnet (7) and the third magnet (8) are moving The magnets, the first magnet (6) and the fourth magnet (9) are fixed magnets, the movable magnet is opposite to the fixed magnet with the same pole, the first magnet (6) is fixedly connected to the upper chuck (1) of the large magnet by bolts, the fourth magnet (9) is fixedly connected to the lower chuck (10) of the large magnet by bolts, the second magnet (7) is sleeved on the intermediate bearing (3) through the upper bearing sleeve (4), and the third magnet (8) is sleeved on the intermediate bearing (3) through the lower bearing sleeve (5). When subjected to vibration excitation in the external environment, the magnetic force on the movable magnet changes, and it moves up and down along the optical axis (2), causing the piezoelectric beam (18) to deform.

2. The magnetic levitation composite piezoelectric energy trap according to claim 1, characterized in that: The piezoelectric mechanism (20) is provided in six equal groups, arranged in a ring array with a 60° interval between each other.

3. The magnetic levitation composite piezoelectric energy trap according to claim 1, characterized in that: In the magnetoelectric mechanism (14), the first magnet (6) and the second magnet (7) are opposite to each other, the second magnet (7) and the third magnet (8) are opposite to each other, and the third magnet (8) and the fourth magnet (9) are opposite to each other. The first magnet (6) and the fourth magnet (9) are fixed magnets, and the second magnet (7) and the third magnet (8) are movable magnets.

4. The magnetic levitation composite piezoelectric energy trap according to claim 1, characterized in that: The second magnet (7) and the third magnet (8) are in a clearance fit, and the second magnet (7) and the third magnet (8) clamp the piezoelectric beam (18).

5. The magnetically levitated composite piezoelectric energy trap according to claim 1, characterized in that: The piezoelectric beam (18) is made of brass, and the piezoelectric sheet (19) is made of piezoelectric ceramic.

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