CN107786122B - Collision frequency-increasing type piezoelectric energy harvester for collecting human body swing energy and energy harvesting method thereof - Google Patents
Collision frequency-increasing type piezoelectric energy harvester for collecting human body swing energy and energy harvesting method thereof Download PDFInfo
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- CN107786122B CN107786122B CN201711190664.9A CN201711190664A CN107786122B CN 107786122 B CN107786122 B CN 107786122B CN 201711190664 A CN201711190664 A CN 201711190664A CN 107786122 B CN107786122 B CN 107786122B
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- 238000003306 harvesting Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005381 potential energy Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Classifications
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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
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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
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention discloses a collision frequency-increasing piezoelectric energy harvester for collecting human body swing energy and an energy harvesting method thereof. The human motion frequency is low, and the existing piezoelectric energy harvester is difficult to be in an effective energy harvesting frequency band, so that the output power of the piezoelectric energy harvester is low. The circular shell base comprises a circular shell and a circular base; the rotating shaft and the circular base form a revolute pair; the pendulum weight is fixed on the rotating shaft, two ends of the plane of the pendulum weight are respectively provided with a round hole, and a magnet is embedded in each round hole; n piezoelectric beams are uniformly distributed and fixed on the rotating shaft along the circumferential direction; n poking sheets uniformly distributed along the circumferential direction are fixed on the inner side wall of the annular shell; two bosses are fixedly arranged on the inner side wall of the annular shell, and magnets are fixedly arranged on the opposite surfaces of the bosses and the plane of the pendulum weight. According to the invention, the pendulum weight swings around the rotating shaft under the human body swinging frequency, so that the piezoelectric beam is driven to collide with the poking piece through the rotating shaft, the piezoelectric beam is caused to vibrate at high frequency to generate electric energy, the frequency-up conversion is realized, the nonlinear rigidity is introduced through the magnet, and the energy capturing frequency band is widened.
Description
Technical Field
The invention relates to an energy collecting device and an energy collecting method, in particular to a collision frequency-increasing piezoelectric energy harvester for collecting swing energy of a human body and an energy harvesting method thereof.
Background
There is a great deal of movement energy during the movement of the human body, such as swinging of the arms and legs. The vibration energy harvester can convert the motion energy in the form of oscillation into electric energy to power the wearable electronic product. In order not to affect the normal motion of the human body, the energy harvester preferably captures the motion energy of the human body by utilizing the inertia of the mass block, and does not apply the driving force artificially and actively. The piezoelectric material can achieve higher energy conversion efficiency due to high electromechanical coupling coefficient, so the piezoelectric material is widely used for vibration energy collection. However, due to low human motion frequency, the existing piezoelectric energy harvester is difficult to be in an effective energy harvesting frequency band, so that the output power of the piezoelectric energy harvester is low.
Disclosure of Invention
The invention aims to solve the problems of low output power and low efficiency of a piezoelectric energy harvester in a low-frequency environment, and provides a collision frequency-increasing piezoelectric energy harvester with high efficiency and high output power and an energy harvesting method thereof.
The technical scheme adopted for solving the technical problems is as follows:
the invention relates to a collision frequency-increasing piezoelectric energy harvester for collecting human body swing energy, which consists of a poking plate, a piezoelectric beam, a swinging weight, a rotating shaft, a magnet, a circular shell base and a boss; the circular shell base comprises an integrally formed circular shell and a circular base; the rotating shaft and the circular base are coaxially arranged, and the rotating shaft and the circular base form a revolute pair. The pendulum weight comprises a first semi-cylinder and a second semi-cylinder which are integrally formed, the radius of the first semi-cylinder is 2-4 mm larger than the radius of the rotating shaft, and the radius of the second semi-cylinder is 4-6 mm smaller than the inner diameter of the annular shell; one half of the center hole formed in the pendulum weight is positioned on the first semi-cylinder, and the other half of the center hole is positioned on the second semi-cylinder; the central hole of the pendulum weight is fixed on the rotating shaft, two ends of the plane of the second semi-cylinder are respectively provided with a round hole, and a magnet is embedded in each round hole. n piezoelectric beams are uniformly distributed and fixed on the rotating shaft along the circumferential direction of the rotating shaft, and n is more than or equal to 4 and less than or equal to 8. N poking sheets uniformly distributed along the circumferential direction are fixed on the inner side wall of the annular shell; in the axial direction of the rotating shaft, the poking piece is aligned with the piezoelectric beam; in the radial direction of the rotating shaft, the distance between the shifting piece and the axis of the rotating shaft is smaller than the distance between the end face of the outer end of the piezoelectric beam and the axis of the rotating shaft; two bosses are fixedly arranged on the inner side wall of the annular shell, the two bosses are respectively arranged at two ends of the plane of the second semi-cylinder, and the distance between the central axis of the rotating shaft and the two bosses is equal; in the axial direction of the rotating shaft, the lug boss is arranged at intervals with the piezoelectric beam; magnets are fixed on the opposite surfaces of the boss and the second semi-cylindrical plane. And in a state that the plane of the second semi-cylinder is parallel to the plane of the boss fixing magnet, the magnet on the second semi-cylinder and the magnet on the boss at the corresponding end are coaxially arranged, and the magnetic poles at the opposite ends are the same.
The annular shell is provided with an adjusting hole group at the position close to the two bosses; the adjusting hole group comprises three adjusting holes circumferentially distributed along the annular shell, and the included angles of central axes of every two adjusting holes are equal; the boss is connected with one of the adjusting holes through a screw.
The magnet is a cylinder.
The collision frequency-rising type piezoelectric energy harvester energy harvesting method for collecting the swing energy of the human body comprises the following specific steps:
when the electric bicycle is carried, the pendulum weight is horizontally placed, and swings around the rotating shaft under the human body swinging frequency, so that the piezoelectric beam is driven to collide with the poking piece through the rotating shaft, and the piezoelectric beam is vibrated at high frequency to generate electric energy. When the pendulum weight swings, the magnets at the two ends of the second semi-cylinder and the magnets on the bosses at the corresponding ends repel each other to act on magnetic force, nonlinear rigidity is introduced to the pendulum weight, the effective energy capturing frequency band of the pendulum weight is widened, when the human body swinging frequency is within the effective energy capturing frequency band of the pendulum weight, the swing amplitude of the pendulum weight is increased, and the collision force of the piezoelectric beam and the plectrum is increased, so that more human body swinging energy is collected. And the magnets at the two ends of the second semi-cylinder and the magnets on the bosses at the corresponding ends mutually repel and magnetically act, so that kinetic energy which cannot be timely converted is stored in a magnetic potential energy form, and more human body swing energy is collected.
The invention has the beneficial effects that:
by introducing nonlinear rigidity, the energy harvesting frequency band is widened, low-frequency swing is converted into high-frequency vibration in a collision mode, up-conversion is realized, and the human body swing energy is converted into electric energy by utilizing a piezoelectric effect.
Drawings
FIG. 1 is a schematic plan view of the present invention;
FIG. 2 is a perspective view of the present invention;
FIG. 3 is a perspective view of a pendulum according to the present invention;
fig. 4 is a schematic view of the present invention when the table position is adjusted to be closest to the weight.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, 2 and 3, the collision frequency-increasing piezoelectric energy harvester for collecting the swing energy of a human body provided by the invention consists of a poking plate 1, a piezoelectric beam 2, a swinging weight 3, a rotating shaft 4, a magnet 5, a circular shell base 6 and a boss; the circular shell base 6 comprises an integrally formed circular shell and a circular base; the rotating shaft 4 and the circular base are coaxially arranged, and the rotating shaft 4 and the circular base form a revolute pair. The pendulum weight 3 comprises a first semi-cylinder and a second semi-cylinder which are integrally formed, the radius of the first semi-cylinder is 2mm larger than that of the rotating shaft 4, and the radius of the second semi-cylinder is 4mm smaller than that of the annular shell; one half of the center hole formed in the pendulum weight 3 is positioned on the first semi-cylinder, and the other half of the center hole is positioned on the second semi-cylinder; the central hole of the pendulum weight 3 is fixed on the rotating shaft 4, two ends of the plane of the second semi-cylinder are respectively provided with a round hole, and a magnet 5 is embedded in each round hole. Six piezoelectric beams 2 are uniformly distributed and fixed on the rotating shaft 4 along the circumferential direction of the rotating shaft 4. Six poking sheets 1 uniformly distributed along the circumferential direction are fixed on the inner side wall of the annular shell; the axial position of the poking plate 1 relative to the rotating shaft 4 corresponds to the axial position of the piezoelectric beam 2 relative to the rotating shaft 4; in the radial direction of the rotating shaft 4, the distance between the poking plate 1 and the axis of the rotating shaft 4 is smaller than the distance between the end face of the outer end of the piezoelectric beam 2 and the axis of the rotating shaft 4; two bosses are fixedly arranged on the inner side wall of the annular shell, the two bosses are respectively arranged at two ends of the plane of the second semi-cylinder, and the distance between the central axis of the rotating shaft 4 and the two bosses is equal; in the axial direction of the rotating shaft, the boss is arranged at intervals with the piezoelectric beam 2; the opposite surface of the boss to the second semi-cylindrical plane is fixed with a magnet 5. In a state that the plane of the second semi-cylinder is parallel to the plane of the boss fixing magnet 5, the magnet 5 on the second semi-cylinder and the magnet 5 on the boss at the corresponding end are coaxially arranged, and the magnetic poles at the opposite ends are the same. When the energy harvester does not move, the magnets 5 at the two ends of the second semi-cylinder are subjected to the repulsive magnetic force from the magnets 5 on the bosses at the two ends, which are equal in size, and can be in the balance position without swinging.
Referring to fig. 1 and 4, an adjusting hole group is formed in the annular shell at positions close to the two bosses; the adjusting hole group comprises three adjusting holes which are circumferentially distributed along the annular shell, and the included angles of central axes of every two adjusting holes are equal; the boss is connected with one of the adjusting holes through a screw, and the boss can be connected with the adjusting hole at different positions, so that the upper position and the lower position of the annular shell are adjustable, the initial distance between the magnet 5 on the second semi-cylinder and the magnet 5 on the boss is changed, the nonlinear rigidity of the pendulum weight 3 is finally changed, and the purpose of widening the effective energy capturing frequency band of the pendulum weight 3 is achieved. Therefore, the working frequency of the pendulum weight 3 can be more easily matched with the swinging frequency of a human body by adjusting the position of the boss.
In this embodiment, the magnets are cylindrical, and other shapes may be used.
The collision frequency-rising type piezoelectric energy harvester energy harvesting method for collecting the swing energy of the human body comprises the following specific steps:
when a human body carries the energy harvester, the swinging weight 3 is horizontally placed, and the swinging weight 3 swings around the rotating shaft 4 under the swinging frequency (less than 10 Hz) of the human body, so that the rotating shaft 4 drives the piezoelectric beam 2 to collide with the plectrum 1, the piezoelectric beam 2 vibrates at high frequency, and the conversion from low frequency to high frequency (50-500 Hz) is realized; the piezoelectric beam 2 generates high-frequency vibration energy to generate electric energy, so that the purpose of energy harvesting is achieved. The piezoelectric beams 2 and the poking sheets 1 are combined to collide, so that the output power is effectively improved. When the pendulum weight 3 swings, the magnets at the two ends of the second semi-cylinder and the magnets on the bosses at the corresponding ends repel each other to act on magnetic force, so that nonlinear rigidity is introduced to the pendulum weight 3, therefore, the effective energy capturing frequency band of the pendulum weight 3 is widened, when the human body swinging frequency is within the effective energy capturing frequency band of the pendulum weight 3, the swing amplitude of the pendulum weight 3 is obvious, the collision force between the piezoelectric beam 2 and the plectrum 1 is increased, more swinging energy can be collected by the energy capturing device, and the energy capturing device can generate electricity efficiently on a wider frequency band. And the magnets at the two ends of the second semi-cylinder and the magnets on the bosses at the corresponding ends mutually repel each other to realize magnetic force action, so that kinetic energy which cannot be converted in time can be stored in a magnetic potential energy mode, and more swing energy can be collected.
The collision frequency-increasing piezoelectric energy harvester for collecting the human body swing energy can broaden the energy harvesting frequency band by introducing nonlinear rigidity under a low-frequency environment, convert low-frequency swing into high-frequency vibration in a collision mode, realize frequency-increasing conversion and convert human body swing energy into electric energy by utilizing a piezoelectric effect.
Claims (2)
1. Collect collision frequency-raising type piezoelectric energy harvester of human body swing energy, its characterized in that: consists of a poking piece, a piezoelectric beam, a swinging weight, a rotating shaft, a magnet, a circular shell base and a boss; the circular shell base comprises an integrally formed circular shell and a circular base; the rotating shaft and the circular base are coaxially arranged, and form a revolute pair; the pendulum weight comprises a first semi-cylinder and a second semi-cylinder which are integrally formed, the radius of the first semi-cylinder is 2-4 mm larger than the radius of the rotating shaft, and the radius of the second semi-cylinder is 4-6 mm smaller than the inner diameter of the annular shell; one half of the center hole formed in the pendulum weight is positioned on the first semi-cylinder, and the other half of the center hole is positioned on the second semi-cylinder; the central hole of the pendulum weight is fixed on the rotating shaft, two ends of the plane of the second semi-cylinder are respectively provided with a round hole, and a magnet is embedded in each round hole; n piezoelectric beams are uniformly distributed and fixed on the rotating shaft along the circumferential direction of the rotating shaft, wherein n is more than or equal to 4 and less than or equal to 8; n poking sheets uniformly distributed along the circumferential direction are fixed on the inner side wall of the annular shell; in the axial direction of the rotating shaft, the poking piece is aligned with the piezoelectric beam; in the radial direction of the rotating shaft, the distance between the shifting piece and the axis of the rotating shaft is smaller than the distance between the end face of the outer end of the piezoelectric beam and the axis of the rotating shaft;
two bosses are fixedly arranged on the inner side wall of the annular shell, the two bosses are respectively arranged at two ends of the plane of the second semi-cylinder, and the distance between the central axis of the rotating shaft and the two bosses is equal; in the axial direction of the rotating shaft, the lug boss is arranged at intervals with the piezoelectric beam; a magnet is fixed on the opposite surface of the boss and the second semi-cylindrical plane; in a state that the plane of the second semi-cylinder is parallel to the plane of the boss fixing magnet, the magnet on the second semi-cylinder and the magnet on the boss at the corresponding end are coaxially arranged, and the magnetic poles at the opposite ends are the same;
the annular shell is provided with an adjusting hole group at the position close to the two bosses; the adjusting hole group comprises three adjusting holes circumferentially distributed along the annular shell, and the included angles of central axes of every two adjusting holes are equal; the boss is connected with one of the adjusting holes through a screw; the magnet is a cylinder.
2. The energy harvesting method of the collision frequency-increasing piezoelectric energy harvester for collecting human body swing energy according to claim 1, wherein the energy harvesting method is characterized by comprising the following steps of: the method comprises the following steps: when the electric bicycle is carried, the pendulum weight is horizontally placed, and swings around the rotating shaft under the human body swinging frequency, so that the piezoelectric beam is driven to collide with the poking piece through the rotating shaft, and the piezoelectric beam is vibrated at high frequency to generate electric energy; when the pendulum weight swings, the magnets at the two ends of the second semi-cylinder and the magnets on the bosses at the corresponding ends repel each other to act, nonlinear rigidity is introduced to the pendulum weight, the effective energy capturing frequency band of the pendulum weight is widened, when the human body swinging frequency is within the effective energy capturing frequency band of the pendulum weight, the swing amplitude of the pendulum weight is increased, and the collision force between the piezoelectric beam and the plectrum is increased, so that more human body swinging energy is collected; and the magnets at the two ends of the second semi-cylinder and the magnets on the bosses at the corresponding ends mutually repel and magnetically act, so that kinetic energy which cannot be timely converted is stored in a magnetic potential energy form, and more human body swing energy is collected.
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| CN109185086B (en) * | 2018-10-18 | 2020-03-31 | 洛阳理工学院 | Frequency-rising human body pendulum energy collecting device with adjustable gravity pendulum period |
| CN109672363B (en) * | 2018-11-29 | 2021-07-02 | 东北林业大学 | Joint type portable wearable energy collection device and method |
| CN114123843B (en) * | 2021-11-26 | 2023-06-06 | 浙江师范大学 | Vortex vibration type river monitoring system power supply device |
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