CN111697878B - Low-frequency collision mode sole energy collector based on piezoelectric stack - Google Patents
Low-frequency collision mode sole energy collector based on piezoelectric stack Download PDFInfo
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- CN111697878B CN111697878B CN202010715139.XA CN202010715139A CN111697878B CN 111697878 B CN111697878 B CN 111697878B CN 202010715139 A CN202010715139 A CN 202010715139A CN 111697878 B CN111697878 B CN 111697878B
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- 229910001369 Brass Inorganic materials 0.000 claims abstract description 48
- 239000010951 brass Substances 0.000 claims abstract description 48
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical group Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims 1
- 238000011089 mechanical engineering Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003306 harvesting Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 241001124569 Lycaenidae Species 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
Abstract
The invention discloses a low-frequency collision mode sole energy collector based on a piezoelectric stack, which relates to the field of mechanical engineering and comprises a bottom plate and an upper plate, wherein the bottom plate and the upper plate are of rectangular structures; a brass vibrator is movably arranged on the bottom plate, one end of the brass vibrator is provided with a first inclined plane inclining downwards, and the other end of the brass vibrator is connected with a piezoelectric energy collecting module through a main spring; the upper plate one end is passed through bolt fixedly connected with brass and is hit the son, and brass hits the son and is located brass oscillator top, and brass hits son one end and has seted up the second inclined plane, and the second inclined plane can cooperate the contact with first inclined plane to be connected. The invention can obtain higher electric energy output by using the low-frequency collision mode to convert the energy of lower frequency in the sole environment on the basis of the piezoelectric stack.
Description
Technical Field
The invention relates to the technical field of mechanical engineering, in particular to a low-frequency collision mode sole energy collector based on a piezoelectric stack.
Background
Piezoelectric Energy Harvesters (PEHs) are an efficient device capable of converting mechanical energy into electrical energy. The piezoelectric material is used as an energy conversion device, and the piezoelectric energy conversion device has the characteristics of high power density and easiness in installation. Furthermore, traditional energy sources (such as chemical batteries) have many drawbacks, such as limited service life, environmental pollution, etc., which are further amplified in today's rapidly evolving industrial environment. To remedy these shortcomings, energy harvesting from the ambient environment has become a leading focus of research and has become popular in recent decades.
Human foot motion is typically low frequency vibrations below 10 hz with a large amount of vibration energy trapped for harvesting. However, at present, the target working range of most energy collectors is a middle-high frequency range from tens of hertz to hundreds of hertz, because the working efficiency of the energy collectors is better in the middle-high frequency range. Therefore, it is an urgent problem to design an energy collector capable of performing frequency modulation to complete the conversion from low frequency vibration to high frequency vibration.
Disclosure of Invention
The invention aims to provide a low-frequency impact mode sole energy collector based on a piezoelectric stack, which is used for solving the problems in the prior art and can obtain higher electric energy output by adopting a low-frequency impact mode to obtain lower-frequency energy in a sole environment based on the piezoelectric stack.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a low-frequency collision mode sole energy collector based on a piezoelectric stack, which comprises a bottom plate and an upper plate, wherein the bottom plate is of a rectangular structure, four support tables are symmetrically and fixedly arranged at four corners of the bottom plate, four screw rods are symmetrically penetrated through the upper plate, the bottoms of the screw rods are fixedly arranged on the support tables, support springs are sleeved on the screw rods, and the support springs are positioned between the upper plate and the support tables; a brass vibrator is movably arranged on the bottom plate, one end of the brass vibrator is provided with a first inclined plane inclining downwards, and the other end of the brass vibrator is connected with a piezoelectric energy collecting module through a main spring; one end of the upper plate is fixedly connected with a brass striker through a bolt, the brass striker is positioned above the brass vibrator, one end of the brass striker is provided with a second inclined surface, and the second inclined surface and the first inclined surface can be in contact connection in a matched mode.
Optionally, the piezoelectric energy collection module includes a force amplifier fixedly arranged on the bottom plate, the force amplifier is of a hollow diamond structure, a piezoelectric stack is embedded in the force amplifier, one end of the force amplifier is fixedly connected with the main spring, and the side wall of one end of the force amplifier, which is connected with the main spring, is of an elastic structure.
Optionally, a baffle is fixedly connected between the two supporting tables at one end of the bottom plate, which is far away from the brass vibrator, one end of the force amplifier is fixedly connected with the baffle, a spring clamping seat is fixedly installed at the other end of the force amplifier, the spring clamping seat is fixedly connected with one end of the main spring, and the other end of the main spring is fixedly connected with the brass vibrator.
Optionally, two slideways are arranged on the bottom plate, two copper balls are movably arranged at the bottom of the brass vibrator and the movable grooves are located in the same vertical plane, and the bottoms of the copper balls are arranged in the slideways in a rolling mode.
Optionally, the piezoelectric stack includes a plurality of piezoelectric sheets stacked in multiple layers, and each layer of the piezoelectric sheets is connected in parallel.
Compared with the prior art, the invention has the following technical effects:
the present invention is used to harvest low frequency vibration energy of foot movements, which is widely available in nature, but few energy harvesters are involved. Through the collision between brass collider and the brass oscillator, convert low frequency vibration into high frequency vibration to the energy harvesting module of being convenient for uses. The impact force of the feet of the human body on the piezoelectric stack is buffered and conducted by using a spring system consisting of 4 supporting springs and 1 main spring, so that the device is protected. The force amplifier structure amplifies the input vibration force, thereby increasing the output voltage of the device. The piezoelectric stack operates in a stressed mode in which the piezoelectric stack is able to withstand greater stress and therefore is able to generate more electrical energy. By utilizing the design structure of the piezoelectric stack, a plurality of piezoelectric sheets can be stressed to work simultaneously, and the output energy is greatly improved. The circuit structure of the piezoelectric stack with the multiple piezoelectric sheets connected in parallel is utilized, so that the internal resistance of the piezoelectric material is reduced, and the loading capacity of the piezoelectric element is greatly improved. The longitudinal motion of the foot is converted into the transverse motion of the vibrator by using the inclined plane design of the rotor and the vibrator, so that the structure of the device is greatly simplified.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of the working principle of the present invention;
FIG. 2 is a schematic diagram of a force amplifier force analysis of the present invention;
FIG. 3 is a schematic diagram of the operating principle of the piezoelectric stack of the present invention;
FIG. 4 is a schematic view of the overall structure of the present invention;
FIG. 5 is an exploded view of the present invention of FIG. 4;
FIG. 6 is a view showing the connection between the brass vibrator and the main spring according to the present invention;
FIG. 7 is a schematic view of the connection of a brass vibrator, main spring, force amplifier and piezoelectric stack in accordance with the present invention;
FIG. 8 is a bottom view of the brass vibrator, main spring, force amplifier and piezoelectric stack attachment of the present invention;
wherein, 1 is brass collider, 2 is brass oscillator, 3 is main spring, 4 is piezoelectric energy collection module, 5 is the piezoelectric stack, 6 is the power amplifier, 7 is the upper plate, 8 is supporting spring, 9 is the bottom plate, 10 is the spring cassette, 11 is the fixed plate, 12 is the set screw, 13 is the copper ball.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a low-frequency impact mode sole energy collector based on a piezoelectric stack, which is used for solving the problems in the prior art and can obtain higher electric energy output by adopting a low-frequency impact mode to obtain lower-frequency energy in a sole environment based on the piezoelectric stack.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The collision is a common upward frequency modulation mode, and a low-frequency vibrator collides with a collider in a high-rigidity environment to generate high-frequency vibration so as to achieve the frequency modulation effect. Because the internal resistance of the piezoelectric element has a direct relation with the vibration frequency (the higher the frequency is, the smaller the internal resistance is), the impact frequency modulation can effectively reduce the internal resistance of the piezoelectric element and improve the loading capacity of the piezoelectric element. The piezoelectric stack is a piezoelectric element formed by firing and stacking a plurality of piezoelectric sheets. Compared with the traditional piezoelectric block, the stack has the characteristics of relatively small internal resistance, large bearable pressure and the like. Therefore, under the condition of large pressure, larger output energy can be obtained, and the device is an ideal element for collecting the energy of the heel of the human body.
Based on the above, the invention provides a piezoelectric stack-based low-frequency impact mode sole energy collector, as shown in fig. 1-8, comprising a brass striker 1, a brass vibrator 2, a main spring 3 and a piezoelectric energy collecting module 4, wherein the piezoelectric energy collecting module 4 comprises a piezoelectric stack 5 and a force amplifier 6, when the invention is in use, the brass striker 1 moves downwards due to the treading of the foot, so as to collide with the brass vibrator 2, so that the low-frequency vibration is converted into high-frequency vibration, and then through the conduction of the main spring 3, the vibration signal is transmitted into the piezoelectric energy collecting module 4, so as to generate electric energy.
Fig. 2 shows a force analysis diagram of the operation of the force amplifier. According to the geometrical relationship, the relationship between the input force and the output force of the force amplifier is as follows:
the piezoelectric stack 5 is formed by stacking a plurality of piezoelectric sheets, each of which is connected in parallel. When the piezoelectric stack is subjected to a compressive force, the plates of the piezoelectric patch experience a voltage change. When the piezoelectric stack 5 is subjected to tensile forces, the voltage change of the piezoelectric plates will be opposite to that in compression.
Assuming that the number of the parallel piezoelectric sheets is n, the output voltage when the piezoelectric stack is stressed is:
the internal resistance of the piezoelectric stack is reduced by the parallel multilayer piezoelectric sheets, so that the loading capacity of the stack can be improved, and the internal resistance of the piezoelectric stack is as follows:
from the expression of the output voltage and the internal resistance, the output voltage of the piezoelectric stack is higher than that of the single chip, and the internal resistance of the piezoelectric stack is lower than that of the single chip, so that higher output power and better loading capacity are obtained.
Specifically, the invention comprises an upper plate 7 made of stainless steel, a brass striker 1, a supporting spring 8, a bottom plate 9, a brass vibrator 2, a main spring 3, a spring clamping seat 10, a piezoelectric stack 5, a force amplifier 6, a fixing plate 11, a fixing screw 12 and a copper ball 13. There are two fixed slots on upper plate 7, hit son 1 fixedly through bolt and brass, and there are four location unthreaded holes in upper plate 7 four corners, and every unthreaded hole passes through fixing screw 12 and restricts its longitudinal movement's height, and fixing screw 12 is fixed through the brace table of screw hole with bottom plate 9, and the four corners of upper plate 7 is supported by four supporting spring 8. The piezoelectric stack 5 is embedded in the force amplifier 6, one side of the force amplifier 6 is fixed with the bottom plate 9 through a bolt, and the other side of the force amplifier 6 is fixed with the spring clamping seat 10 through a bolt structure. One end of the main spring 3 is embedded into the spring clamping seat 10, and the other end of the main spring is fixed with the brass vibrator 2 through the fixing plate 11 and the bolt. The brass vibrator 2 is placed on the bottom plate 9 and can do reciprocating motion with single degree of freedom in the transverse direction. The copper ball 13 is arranged in a ball pit at the bottom of the brass vibrator 2, and a roller at the bottom of the copper ball 13 is arranged in a slide way of the bottom plate 9 and used for reducing the friction force during reciprocating motion.
When the invention is subjected to low-frequency vibration of the sole of a foot, the upper plate 7 is extruded by the foot to drive the brass striker 1 to move downwards. The brass striker 1 strikes the brass vibrator 2, generating high-frequency vibration, the brass vibrator 2 moves horizontally on the bottom plate 9, transmitting the high-frequency vibration to the main spring 3, and the main spring 3 transmits the high-frequency vibration to the force amplifier 6. The force amplifier 6 converts the axial vibration force into an amplified compression force and an amplified tension force by a force amplification process, and applies the amplified compression force and tension force to the piezoelectric stack 5. The piezoelectric stack 5 is stressed, and each piezoelectric layer generates electric energy which is output to a circuit load through a parallel circuit, so that the energy conversion is completed.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (3)
1. A piezoelectric stack based low frequency collision mode plantar energy harvester, characterized by: the supporting device comprises a bottom plate and an upper plate which are of a rectangular structure, wherein four supporting tables are symmetrically and fixedly arranged at four corners of the bottom plate, four screw rods symmetrically penetrate through the upper plate, the bottoms of the screw rods are fixedly arranged on the supporting tables, supporting springs are sleeved on the screw rods, and the supporting springs are positioned between the upper plate and the supporting tables; a brass vibrator is movably arranged on the bottom plate, one end of the brass vibrator is provided with a first inclined plane inclining downwards, and the other end of the brass vibrator is connected with a piezoelectric energy collecting module through a main spring; one end of the upper plate is fixedly connected with a brass striker through a bolt, the brass striker is positioned above the brass vibrator, one end of the brass striker is provided with a second inclined surface, and the second inclined surface and the first inclined surface can be in contact connection in a matching manner; the piezoelectric energy collection module comprises a piezoelectric stack and a force amplifier fixedly arranged on a bottom plate, the force amplifier is of a rhombic structure with a hollow interior, the piezoelectric stack is embedded in the force amplifier, one end of the force amplifier is fixedly connected with the main spring, and the side wall of the end, connected with the main spring, of the force amplifier is of an elastic structure; two slides have been seted up on the bottom plate, brass oscillator bottom movable mounting have two with the slide is located the copper ball in same vertical plane, the copper ball bottom roll set up in the slide.
2. A piezoelectric stack based low frequency collision mode plantar energy harvester according to claim 1 wherein: the bottom plate is far away from the baffle fixedly connected between the two supporting tables at one end of the brass vibrator, one end of the force amplifier is fixedly connected with the baffle, the other end of the force amplifier is fixedly provided with a spring clamping seat, the spring clamping seat is fixedly connected with one end of the main spring, and the other end of the main spring is fixedly connected with the brass vibrator.
3. A piezoelectric stack based low frequency collision mode plantar energy harvester according to claim 1 wherein: the piezoelectric stack comprises a plurality of layers of stacked piezoelectric sheets, and the piezoelectric sheets of each layer are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010715139.XA CN111697878B (en) | 2020-07-23 | 2020-07-23 | Low-frequency collision mode sole energy collector based on piezoelectric stack |
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| CN202010715139.XA CN111697878B (en) | 2020-07-23 | 2020-07-23 | Low-frequency collision mode sole energy collector based on piezoelectric stack |
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| CN111697878A CN111697878A (en) | 2020-09-22 |
| CN111697878B true CN111697878B (en) | 2021-05-25 |
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| CN102739107B (en) * | 2012-05-22 | 2015-01-14 | 哈尔滨工业大学深圳研究生院 | Collision type piezoelectric micro-energy collector |
| EP2983287A1 (en) * | 2014-08-07 | 2016-02-10 | Ostbayerische Technische Hochschule Regensburg | Energy harvester |
| CN106803726B (en) * | 2015-11-26 | 2019-05-10 | 清华大学 | Low-frequency vibration electromagnetic energy collector |
| CN107040166A (en) * | 2017-06-07 | 2017-08-11 | 张曦予 | Override type volt for corridor wall guide lamp including same can device |
| CN108111057B (en) * | 2017-12-29 | 2023-10-31 | 浙江理工大学 | Multifunctional three-direction piezoelectric-electromagnetic coupling transducer |
| CN108718161B (en) * | 2018-05-31 | 2019-07-12 | 北京工业大学 | A kind of piezo-electric generating floor |
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