CN112532107B - Human body wearable energy collector based on piezoelectric stack and frequency modulation effect - Google Patents
Human body wearable energy collector based on piezoelectric stack and frequency modulation effect Download PDFInfo
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- CN112532107B CN112532107B CN202011430436.6A CN202011430436A CN112532107B CN 112532107 B CN112532107 B CN 112532107B CN 202011430436 A CN202011430436 A CN 202011430436A CN 112532107 B CN112532107 B CN 112532107B
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- 230000007246 mechanism Effects 0.000 claims abstract description 45
- 230000003321 amplification Effects 0.000 claims abstract description 36
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 36
- 230000000903 blocking effect Effects 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 12
- 230000003044 adaptive effect Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 210000003423 ankle Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 210000002683 foot Anatomy 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
- H02N2/183—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using impacting bodies
Abstract
The invention discloses a human body wearable energy collector based on a piezoelectric stack and a frequency modulation effect, which relates to the technical field of wearable power generation devices and comprises a shell, a mass block, a guide rod, the piezoelectric stack, a force amplification mechanism and a limiting assembly, wherein the shell is of a structure with an opening at the lower end, the force amplification mechanism is arranged in the shell, the upper end of the force amplification mechanism is fixed on the top surface of the shell, the piezoelectric stack is fixed in the force amplification mechanism, the guide rod is fixed at the lower end of the force amplification mechanism, the mass block is slidably sleeved on the upper part of the guide rod, the limiting assembly is fixedly sleeved on the lower part of the guide rod, a spring is arranged between the mass block and the limiting assembly, and the spring is sleeved on the guide rod. The human body wearable energy collector based on the piezoelectric stack and the frequency modulation effect is small in structure, wearable, adaptive to a certain degree, high in power generation quantity, and capable of further expanding the application range of the piezoelectric power generation device.
Description
Technical Field
The invention relates to the technical field of wearable power generation devices, in particular to a human body wearable energy collector based on a piezoelectric stack and a frequency modulation effect.
Background
With the development of the technology level, the market and industry number of integrated circuits, micro electromechanical systems, and particularly wearable devices, is increasing explosively. However, it is difficult for these devices to obtain energy from the host and to charge themselves, and conventional chemical batteries also have more and more disadvantages in terms of life span, use times, environmental pollution, etc., and thus, how to research a wearable portable energy collecting device is also receiving more and more attention.
In terms of the principle of micro vibration energy collection, four types of piezoelectric type, electromagnetic type, triboelectric type and electrostatic type are mainly used. Among them, the piezoelectric energy harvesting device has many advantages in the aspects of volume, power density, cost, etc., and the piezoelectric energy harvesting device utilizes the direct piezoelectric effect: when the external force in a certain fixed direction acts on the surface of the crystal, an electric polarization phenomenon is generated in the crystal, and charges with opposite signs are generated on two surfaces; when the external force is removed, the crystal returns to the uncharged state. The wearable piezoelectric energy collector is a renewable, pollution-free and portable power supply, and has a wide application prospect in providing energy for wearable intelligent electronic equipment.
At present, the main problems facing the use of piezoelectric energy collecting devices to provide electric energy for wearable intelligent electronic devices are as follows: firstly, the piezoelectric energy collector which is traditionally used for collecting vibration energy (such as energy generated when mechanical structures such as automobiles, airplanes and the like run) cannot be used for collecting energy in low-frequency motion of human bodies due to high working frequency; secondly, the cantilever beam type piezoelectric energy collecting device in the traditional sense can only meet the electric quantity requirement of a small range of electronic equipment due to low generated energy; and thirdly, how to use the piezoelectric energy collecting device for human body movement to obtain energy from human body movement and realize the power generation requirement.
Disclosure of Invention
In order to solve the technical problems, the invention provides the human body wearable energy collector based on the piezoelectric stack and the frequency modulation effect, which is small in structure, wearable, adaptive to a certain degree, high in power generation quantity and capable of further expanding the application range of the piezoelectric power generation device.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a human body wearable energy collector based on a piezoelectric stack and a frequency modulation effect, which comprises a shell, a mass block, a guide rod, the piezoelectric stack, a force amplification mechanism and a limiting assembly, wherein the shell is of a structure with an opening at the lower end, the force amplification mechanism is arranged in the shell, the upper end of the force amplification mechanism is fixed on the top surface of the shell, the piezoelectric stack is fixed in the force amplification mechanism, the guide rod is fixed at the lower end of the force amplification mechanism, the mass block is slidably sleeved at the upper part of the guide rod, the limiting assembly is fixedly sleeved at the lower part of the guide rod, a spring is arranged between the mass block and the limiting assembly, and the spring is sleeved on the guide rod.
Preferably, the mass block fixing device further comprises a linear bearing, wherein the linear bearing is sleeved on the guide rod, and the mass block is fixedly sleeved on the linear bearing.
Preferably, the guide rod comprises a first thread section, a cylindrical section and a second thread section which are sequentially connected from top to bottom, the diameter of the cylindrical section is larger than the diameters of the first thread section and the second thread section, the first thread section is in threaded connection with the bottom end of the force amplification mechanism, the cylindrical section is sleeved with the linear bearing, and the limiting assembly is installed on the second thread section.
Preferably, the limiting assembly comprises a blocking piece and a locking nut, the blocking piece and the locking nut are both installed on the second thread section, the upper end of the blocking piece is limited by the bottom surface of the cylindrical section, and the lower end of the blocking piece is limited by the locking nut.
Preferably, mass block lower extreme one side is provided with the semi-annular groove, separation blade upper end middle part is provided with the mounting groove, the upper end and the lower extreme of spring joint respectively in the semi-annular groove with in the mounting groove.
Preferably, a strap is further included, the strap being mounted to the rear side of the housing.
Preferably, the housing comprises a first housing, a second housing and a connecting assembly, the first housing comprises a U-shaped plate, a top plate and two connecting plates, the top plate is fixed on the top of the U-shaped plate, one connecting plate is fixed on each of two sides of the U-shaped plate, and the force amplification mechanism is fixed on the top plate through a fastening screw; the second casing includes the bottom plate, through coupling assembling will two the connecting plate is fixed in on the bottom plate, the U-shaped board is kept away from one side of bottom plate is provided with the rectangle mouth.
Preferably, the second casing still includes two mounting panels, two mounting panel vertical fixation is in the bottom plate is kept away from one side of first casing, be provided with the bar hole on the mounting panel, the mounting panel with the length direction in bar hole all with the length direction in guide bar is unanimous, the bar hole is used for the installation the bandage.
Preferably, the connecting assembly includes a plurality of fastening bolts and a plurality of fastening nuts, a plurality of fastening bolts are provided on each of the connecting plates, and each of the fastening bolts is locked by one of the fastening nuts.
Compared with the prior art, the invention has the following technical effects:
the invention provides a human body wearable energy collector based on a piezoelectric stack and a frequency modulation effect, which comprises a shell, a mass block, a guide rod, the piezoelectric stack, a force amplification mechanism and a limiting assembly. The device provided by the invention is small in structure, can be worn on a human body to collect kinetic energy of a person during movement, has certain self-adaptability, and has the advantages that the higher the human body movement frequency is, the higher the speed is, the better the power generation capacity is, and the application range of the piezoelectric power generation device is further expanded.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed 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 creative efforts.
Fig. 1 is a schematic structural diagram of a human body wearable energy collector based on a piezoelectric stack and a frequency modulation effect according to the present invention;
FIG. 2 is an exploded view of a body-worn energy collector based on a piezo-electric stack and frequency modulation effect according to the present invention;
FIG. 3 is a left side view of a body-worn energy collector based on a piezo stack and frequency modulation effect in accordance with the present invention;
fig. 4 is a schematic view illustrating an installation of a piezoelectric stack and a force amplifying mechanism in the human body wearable energy collector based on the piezoelectric stack and the frequency modulation effect according to the present invention;
fig. 5 is a schematic view of the installation of the linear bearing, the mass block, the limiting assembly and the guide rod in the human body wearable energy collector based on the piezoelectric stack and the frequency modulation effect provided by the invention;
FIG. 6 is a schematic diagram of the movement of a mass block in the human body wearable energy collector based on the piezoelectric stack and the frequency modulation effect provided by the invention;
fig. 7 is a schematic view of the installation of the strap in the human body wearable energy collector based on the piezoelectric stack and the frequency modulation effect.
Description of reference numerals: 1. a first housing; 101. a U-shaped plate; 102. a top plate; 103. a connecting plate; 104. a rectangular opening; 2. a force amplification mechanism; 3. a piezoelectric stack; 4. fastening screws; 5. a mass block; 6. a spring; 7. a baffle plate; 8. a second housing; 801. a base plate; 802. mounting a plate; 803. a strip-shaped hole; 9. a guide bar; 91. a first thread segment; 92. a cylindrical section; 93. a second thread segment; 10. fastening a bolt; 11. a linear bearing; 12. fastening a nut; 13. locking the nut; 14. binding bands; 15. a semi-annular groove; 16. and (4) mounting the groove.
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 human body wearable energy collector based on a piezoelectric stack and a frequency modulation effect, which is small in structure, wearable, adaptive to a certain degree, high in power generation quantity and capable of further expanding the application range of a piezoelectric power generation device.
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.
As shown in fig. 1-3, the present embodiment provides a human body wearable energy collector based on piezoelectric stack and frequency modulation effect, which includes a housing, a mass block 5, a guide rod 9, a piezoelectric stack 3, a force amplification mechanism 2 and a limit component, wherein the housing has a lower end opening structure, the force amplification mechanism 2 is disposed in the housing, the upper end of the force amplifying mechanism 2 is fixed on the top surface of the shell, the piezoelectric stack 3 is fixed in the force amplifying mechanism 2, the piezoelectric stack 3 and the force amplifying mechanism 2 form an energy conversion unit, by adopting the piezoelectric stacks 3, on one hand, the resistance of the piezoelectric stacks 3 is reduced and the output power is increased by adopting a parallel connection mode among the piezoelectric sheets, on the other hand, the piezoelectric stacks 3 are placed in the middle of the force amplifying mechanism 2, when the mass block 5 impacts the force amplifying mechanism 2, higher force can be output to the piezoelectric stack 3, so that the piezoelectric stack 3 is sufficiently acted by the output force to generate higher electric quantity. The guide rod 9 is fixed at the lower end of the force amplifying mechanism 2, the mass block 5 is slidably sleeved at the upper part of the guide rod 9, the limiting component is fixedly sleeved at the lower part of the guide rod 9, a spring 6 is arranged between the mass block 5 and the limiting component, and the spring 6 is sleeved on the guide rod 9. The mass block 5 is adopted to convert the mechanical energy of the human body during movement into the mechanical energy of the movement of the mass block 5, and then the mechanical energy is converted into electric energy through the force amplification mechanism 2 and the piezoelectric stack 3, when the human body moves, the swinging of the legs causes the mass block 5 to move along the direction of the guide rod 9, and primary conversion of energy is realized. A spring 6 is designed between the mass block 5 and the limiting component, when the mass block 5 reciprocates, a part of mechanical energy of the motion of the mass block 5 is converted into spring elastic potential energy to play a role of buffering, on the other hand, when the mass block 5 impacts the force amplification mechanism 2, the force amplification mechanism 2 generates high-frequency vibration, so that low-frequency vibration of the mass block 5 is converted into high-frequency vibration of the force amplification mechanism 2, and the spring 6 and the mass block 5 determine the vibration frequency of the force amplification mechanism 2 to play a role of frequency modulation.
As shown in fig. 4, the force amplification mechanism 2 in this embodiment is a diamond-shaped force amplification mechanism, the piezoelectric stack 3 is horizontally disposed in the middle of the force amplification mechanism 2, and the piezoelectric stack 3 and the force amplification mechanism 2 are bonded by solid glue.
As shown in fig. 5, the present embodiment further includes a linear bearing 11, the linear bearing 11 is sleeved on the guide rod 9, the mass block 5 is fixedly sleeved on the linear bearing 11, and friction can be reduced by the arrangement of the linear bearing 11, so that the mass block 5 moves more smoothly, and energy conversion efficiency is improved. The mass block 5 adopts a structure with a middle through hole, the matching mode of the linear bearing 11 and the through hole on the mass block 5 is interference fit, and the assembling mode adopts hot assembly, so that the purpose of fixing the linear bearing 11 and the mass block 5 is achieved.
The guide rod 9 comprises a first thread section 91, a cylindrical section 92 and a second thread section 93 which are sequentially connected from top to bottom, the diameter of the cylindrical section 92 is larger than the diameters of the first thread section 91 and the second thread section 93, the first thread section 91 is in threaded connection with the bottom end of the force amplification mechanism 2, the cylindrical section is sleeved with the linear bearing 11, and the limiting assembly is installed on the second thread section 93.
Specifically, the limiting assembly comprises a blocking piece 7 and a locking nut 13, the blocking piece 7 and the locking nut 13 are both mounted on the second thread section 93, the upper end of the blocking piece 7 is limited by the bottom surface of the cylindrical section, and the lower end of the blocking piece 7 is limited by the locking nut 13. During the use, the first screw thread section 91 threaded connection of guide bar 9 is in the bottom of power amplification mechanism 2, locates cylinder section 92 with linear bearing 11 and quality piece 5 cover, installs spring 6 in quality piece 5 lower extreme again, installs separation blade 7 and lock nut 13 in proper order in second screw thread section 93 for separation blade 7 upper end butt is in cylinder section 92 bottom, and screws up lock nut 13 and realizes the fixed of separation blade 7.
In order to realize the clamping connection of the spring 6, the mass block 5 and the separation blade 7, a semi-annular groove 15 is formed in one side of the lower end of the mass block 5, a mounting groove 16 is formed in the middle of the upper end of the separation blade 7, and the upper end and the lower end of the spring 6 are clamped in the semi-annular groove 15 and the mounting groove 16 respectively.
To facilitate the wearing of the device in this embodiment on the leg or ankle, the present embodiment further comprises a strap 14, as shown in fig. 7, the strap 14 being mounted to the rear side of the housing. The straps 14 in this embodiment are foot loop straps or other flexible straps.
As shown in fig. 2, the housing includes a first housing 1, a second housing 8 and a connecting assembly, the first housing 1 includes a U-shaped plate 101, a top plate 102 and two connecting plates 103, the top of the U-shaped plate 101 is fixed with the top plate 102, two sides of the U-shaped plate 101 are respectively fixed with one connecting plate 103, and the force amplification mechanism 2 is fixed on the top plate 102 by fastening screws 4; the second housing 8 comprises a bottom plate 801, two connecting plates 103 are fixed on the bottom plate 801 through a connecting assembly, and a rectangular opening 104 is formed in one side of the U-shaped plate 101 away from the bottom plate 801.
As shown in fig. 3, the second housing 8 further includes two mounting plates 802, the two mounting plates 802 are perpendicularly fixed to the side of the bottom plate 801 away from the first housing 1, a strip-shaped hole 803 is formed in the mounting plate 802, the length directions of the mounting plates 802 and the strip-shaped hole 803 are both consistent with the length direction of the guide bar 9, and the strip-shaped hole 803 is used for mounting the binding band 14.
Specifically, the connecting assembly includes a plurality of fastening bolts 10 and a plurality of fastening nuts 12, a plurality of fastening bolts 10 are provided on each connecting plate 103, and each fastening bolt 10 is fastened by one fastening nut 12, thereby achieving the fixation of the first and second housings 1 and 8.
The specific using process is as follows: the device in this embodiment is strapped to the leg or ankle by means of straps 14 passing through two strip holes 803, when the human body walks or runs, as shown in fig. 6, the motion of the legs will drive the mass 5 to move up and down along the guide rods 9, when the mass 5 moves, a part of the mechanical energy of the mass 5 is converted into the elastic potential energy of the spring 6, meanwhile, due to the existence of the spring 6, the mass block 5 has a buffer effect on the impact of the force amplifying mechanism 2, when the mass block 5 rises to the highest point and impacts the force amplifying mechanism 2, by the amplification action of the force amplification mechanism 2, the force acting on the piezoelectric stack 3 is amplified, higher voltage output can be generated at the output end of the piezoelectric stack 3 according to the piezoelectric effect, so that the energy of human body movement is converted into electric energy to be utilized, the collection of the human body movement energy is realized, and the electric energy meeting the load requirement can be obtained after the output voltage is processed by a processing circuit.
Therefore, the energy collector based on the piezoelectric stack and the frequency modulation effect provided by the embodiment is small in structure, can be worn on a human body to collect kinetic energy of a person during movement, and further expands the application field of the piezoelectric power generation equipment. The device has structurally realized the conversion from the mechanical energy of human motion to the electric energy, can provide the electric energy for the work of intelligent electronic equipment such as small-size wearable electronic equipment such as intelligent wrist-watch, portable medical treatment detection sensor, locator, can realize this type of small-size wearable intelligent electronic equipment's self-power requirement completely. Meanwhile, the device has certain adaptability, when the human body moves at a higher speed and a higher frequency, the electromechanical conversion capability of the device is stronger, and the electric energy output to the small electronic equipment for working is more.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present 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 (7)
1. The human body wearable energy collector based on the piezoelectric stack and the frequency modulation effect is characterized by comprising a shell, a mass block, a guide rod, the piezoelectric stack, a force amplification mechanism, a linear bearing and a limiting assembly, wherein the shell is of a lower end opening structure, the force amplification mechanism is arranged in the shell, the upper end of the force amplification mechanism is fixed on the top surface of the shell, the piezoelectric stack is fixed in the force amplification mechanism, the guide rod is fixed at the lower end of the force amplification mechanism, the mass block is slidably sleeved on the upper portion of the guide rod, the limiting assembly is fixedly sleeved on the lower portion of the guide rod, a spring is arranged between the mass block and the limiting assembly, and the spring is sleeved on the guide rod; the linear bearing is sleeved on the guide rod, and the mass block is fixedly sleeved on the linear bearing; the guide rod comprises a first thread section, a cylindrical section and a second thread section which are sequentially connected from top to bottom, the diameter of the cylindrical section is larger than that of the first thread section and that of the second thread section, the first thread section is in threaded connection with the bottom end of the force amplification mechanism, the linear bearing is sleeved on the cylindrical section, and the limiting assembly is installed on the second thread section.
2. The body-worn energy collector based on a piezoelectric stack and frequency modulation effect according to claim 1, wherein the limiting component comprises a blocking piece and a locking nut, the blocking piece and the locking nut are both mounted on the second thread section, the upper end of the blocking piece is limited by the bottom surface of the cylindrical section, and the lower end of the blocking piece is limited by the locking nut.
3. The human body wearable energy collector based on the piezoelectric stack and frequency modulation effect as claimed in claim 2, wherein a semi-annular groove is formed on one side of the lower end of the mass block, a mounting groove is formed in the middle of the upper end of the baffle, and the upper end and the lower end of the spring are respectively clamped in the semi-annular groove and the mounting groove.
4. The piezo-electric stack and frequency modulation effect based body worn energy collector of claim 1, further comprising a strap mounted to a rear side of the housing.
5. The human body wearable energy collector based on the piezoelectric stack and frequency modulation effect as claimed in claim 4, wherein the housing comprises a first housing, a second housing and a connecting component, the first housing comprises a U-shaped plate, a top plate and two connecting plates, the top plate is fixed on the top of the U-shaped plate, one connecting plate is fixed on each side of the U-shaped plate, and the force amplifying mechanism is fixed on the top plate through a fastening screw; the second casing includes the bottom plate, through coupling assembling will two the connecting plate is fixed in on the bottom plate, the U-shaped board is kept away from one side of bottom plate is provided with the rectangle mouth.
6. The human body wearable energy collector based on the piezoelectric stack and the frequency modulation effect according to claim 5, wherein the second casing further comprises two mounting plates, the two mounting plates are perpendicularly fixed on one side of the bottom plate away from the first casing, a strip-shaped hole is formed in the mounting plates, the length directions of the mounting plates and the strip-shaped hole are consistent with the length direction of the guide rod, and the strip-shaped hole is used for mounting the binding band.
7. The body-worn energy harvester based on a piezoelectric stack and a frequency modulation effect according to claim 5, wherein the connecting assembly comprises a plurality of fastening bolts and a plurality of fastening nuts, a plurality of fastening bolts are arranged on each connecting plate, and each fastening bolt is locked by one fastening nut.
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| CN110418680A (en) * | 2017-03-15 | 2019-11-05 | Tdk电子股份有限公司 | The application of element with may be worn on and the element with may be worn on |
| CN111355355A (en) * | 2020-04-07 | 2020-06-30 | 南京邮电大学 | Wearable piezoelectric-electromagnetic composite energy harvesting vibration device |
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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 |
| US20170133953A1 (en) * | 2015-11-05 | 2017-05-11 | TekCapital LLC | Low frequency dual mode energy harvesting methods, systems, and portable devices |
| CN205657479U (en) * | 2016-05-05 | 2016-10-19 | 西南交通大学 | Wearable motion electricity generation energy memory |
| CN107093963B (en) * | 2017-02-23 | 2019-04-19 | 南京航空航天大学 | A kind of multi-direction superlow frequency vibrating energy harvester |
| CN110829895A (en) * | 2019-12-12 | 2020-02-21 | 西南交通大学 | Buckling self-adjusting piezoelectric energy recovery device |
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| CN104283460A (en) * | 2014-10-11 | 2015-01-14 | 北京工业大学 | High-efficiency multidirectional vibration energy collection device |
| CN106602931A (en) * | 2017-02-28 | 2017-04-26 | 武汉大学 | Piezoelectric material-based vibration energy recuperation apparatus |
| CN110418680A (en) * | 2017-03-15 | 2019-11-05 | Tdk电子股份有限公司 | The application of element with may be worn on and the element with may be worn on |
| CN110353432A (en) * | 2019-06-11 | 2019-10-22 | 杭州电子科技大学 | A kind of sitting posture detection seat of piezoelectric type power generation and its power generation, detection method |
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