CN107317518B - Self-powered device for river monitoring system - Google Patents
Self-powered device for river monitoring system Download PDFInfo
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- CN107317518B CN107317518B CN201710728549.6A CN201710728549A CN107317518B CN 107317518 B CN107317518 B CN 107317518B CN 201710728549 A CN201710728549 A CN 201710728549A CN 107317518 B CN107317518 B CN 107317518B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- 230000005284 excitation Effects 0.000 claims abstract description 33
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 31
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 abstract description 8
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000005452 bending Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000003903 river water pollution Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil 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
- H02N2/185—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using fluid streams
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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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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The invention relates to a self-powered device for a river monitoring system, and belongs to the technical field of power generation. The end part of the shell is provided with an end cover, the inner side of the bottom wall of the shell is provided with a limiting magnet, the outer side of the bottom wall of the shell is provided with 4 lug plates, and the end parts of the 4 lug plates are connected in pairs through cross beams; the end cover boss is provided with a piezoelectric vibrator and an excitation reed, and gaskets are pressed between the excitation reed and the fixed ends of the adjacent piezoelectric vibrators and between the fixed ends of the two adjacent piezoelectric vibrators; the piezoelectric vibrator is formed by bonding a substrate and a piezoelectric wafer, the free end of the piezoelectric vibrator is provided with a top block, the top block abuts against an excitation reed, and the free end of the excitation reed is provided with a mass block and excited magnets; two ends of a pin shaft are respectively fixed on two parallel cross beams, the pin shaft is sequentially sleeved with a balance spring, a bluff body and a limiting spring from bottom to top, and an excitation magnet is arranged on the bluff body. The advantages are that: the energy harvester is a 3-degree-of-freedom system, and the inherent frequency of each subsystem is easy to adjust and the frequency band is wide; the piezoelectric vibrator is not contacted with the fluid, the piezoelectric wafer is only stressed by pressure, and the reliability is high.
Description
Technical Field
The invention belongs to the technical field of power generation, and particularly relates to a self-powered device for a river monitoring system, which is used for providing energy for the river monitoring system.
Background
There are thousands of rivers in China. In recent years, most rivers have a certain pollution problem due to insufficient treatment power of industrial waste and sewage, water and soil loss, improper use of pesticides and chemical fertilizers and the like, and nearly 1/4 of the rivers or river sections cannot meet basic irrigation requirements due to pollution. In addition, because the flood control facilities of small and medium rivers in many areas are imperfect at present, or even no flood control facilities are provided, the danger of bank breaking or bank overflowing can be caused when the flood season comes, and the safety of lives and property of people along the bank is threatened directly. Therefore, river monitoring is highly regarded by relevant departments of the state, and the water conservancy department plans to realize full coverage of monitoring of more than five thousand rivers determined in the special plans of medium and small river treatment and medium and small reservoir risk removal and reinforcement during twelve and five periods; meanwhile, experts and scholars in China also put forward corresponding monitoring methods and means in succession, including a water quality monitoring technology aiming at river water pollution, a rainfall and water level and river water flow speed monitoring technology aiming at natural disasters such as flood control and debris flow. Although some of the currently proposed monitoring methods are mature in the technical aspect, they have not been widely popularized and applied yet, and one of the main reasons is that the problem of power supply of the monitoring system is not solved well.
Disclosure of Invention
The invention provides a self-powered device for a river monitoring system, which adopts the following implementation scheme: an end cover is arranged at the end part of the side wall of the shell through a screw, the outer side of the bottom wall of the shell is an arc surface, a limiting magnet is arranged at the inner side of the bottom wall of the shell, 4 lug plates are arranged at the outer side of the bottom wall of the shell, and the end parts of the 4 lug plates are connected in pairs through cross beams; the piezoelectric vibrators and the excitation reed are arranged on a boss of the end cover through screws and a pressing plate, the number of the piezoelectric vibrators on two sides of the excitation reed is equal, and gaskets are pressed between the excitation reed and fixed ends of the adjacent piezoelectric vibrators and between the fixed ends of the two adjacent piezoelectric vibrators; the piezoelectric vibrator is formed by bonding a substrate and a piezoelectric wafer, the free end of the piezoelectric vibrator is provided with a top block through a screw, the top block is positioned on one side of the substrate and abuts against an excitation reed, and the free end of the excitation reed is provided with a mass block and excited magnets through screws; two ends of a pin shaft are respectively fixed on two parallel cross beams, the pin shaft is sequentially sleeved with a balance spring, a blunt body and a limiting spring from bottom to top, the blunt body is of a hollow structure, and an excitation magnet is mounted on the blunt body through a screw and is attracted by the excitation magnet and repelled by the limiting magnet.
In the invention, the piezoelectric vibrator is of a straight structure before installation and a bending structure after installation, the piezoelectric wafer bears compressive stress, and the maximum compressive stress on the piezoelectric wafer is 50% of the allowable compressive stress when the piezoelectric vibrator is not in work; the height of the top block is
Wherein: b =1- α + α β, a = α 4 (1-β) 2 -4α 3 (1-β)+6α 2 (1-β)-4α(1-β)+1，
α＝h m /H，β＝E m /E p ，h m H is the thickness of the substrate and the total thickness of the piezoelectric vibrator, respectively, E m And E p Young's modulus, k, of the substrate and the piezoelectric wafer, respectively 31 And
the electromechanical coupling coefficient and the allowable compressive stress of the piezoelectric ceramic material are respectively, and L is the length of the piezoelectric vibrator.
Under the non-working state, the excitation reed does not bend and deform, and the deformation and the stress state of the piezoelectric vibrators symmetrically arranged on the two sides of the excitation reed are respectively the same. In a working state, namely when fluid flows through the blunt body from right to left, the blunt body can be subjected to an up-and-down alternating acting force exerted by the fluid, so that the blunt body can swing up and down in a reciprocating manner, and then the exciting reed is driven to swing in a reciprocating manner by the mutual attraction between the exciting magnet and the excited magnet; the exciting reed forces the piezoelectric vibrator to generate unidirectional bending deformation through the jacking block; when the bending deformation of the piezoelectric vibrator on one side of the excitation reed and the pressure stress borne by the piezoelectric wafer are gradually increased, the deformation of the piezoelectric vibrator on the other side and the pressure stress borne by the piezoelectric wafer are gradually reduced; the mechanical energy is converted into electric energy in the process of alternately increasing and decreasing the compressive stress applied to the piezoelectric wafer, and the generated electric energy is used for a monitoring system after conversion treatment; when the excited magnet contacts with one of the limiting magnets, the pressure stress on the piezoelectric chip is not greater than the allowable pressure stress.
In the invention, the piezoelectric vibrator and the top block form a spring mass system, the exciting reed, the excited magnet and the mass block form a spring mass system, and the exciting magnet, the blunt body, the balance spring and the limit spring form a spring mass system, so the energy harvester is a three-degree-of-freedom system.
Advantages and features: (1) the energy harvester is a 3-degree-of-freedom system, the inherent frequency of the energy harvester is easily adjusted through the mass and rigidity of each subsystem, the frequency band is wide, and the fluid environment adaptability is strong; (2) the piezoelectric vibrator does not directly act with the fluid, and the piezoelectric wafer only bears uniformly distributed and controllable pressure stress in work, so that the reliability is high and the power generation capacity is large; (3) self-excited vibration is generated by utilizing the fluid lift force borne by the blunt body, and the excitation effect is better at low speed.
Drawings
FIG. 1 is a schematic diagram of a self-powered device in accordance with a preferred embodiment of the present invention;
fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 1.
Detailed Description
An end cover b is installed at the end part of the side wall of the shell a through a screw, the outer side of the bottom wall a1 of the shell is an arc surface, a limiting magnet x is installed at the inner side of the bottom wall a1 of the shell, 4 lug plates a2 are arranged at the outer side of the bottom wall a1 of the shell, and the end parts of the 4 lug plates a2 are connected in pairs through a cross beam a 3; the boss b1 of the end cover b is provided with a piezoelectric vibrator d and an excitation reed e through a screw and a pressing plate c, the number of the piezoelectric vibrators d on two sides of the excitation reed e is equal, and gaskets f are pressed between the excitation reed e and the fixed ends of the adjacent piezoelectric vibrators d and between the fixed ends of the two adjacent piezoelectric vibrators d; the piezoelectric vibrator d is formed by bonding a substrate d1 and a piezoelectric wafer d2, the free end of the piezoelectric vibrator d is provided with a top block g through a screw, the top block g is positioned on one side of the substrate d1 and abuts against an excitation reed e, and the free end of the excitation reed e is provided with a mass block h and an excited iron i through a screw; two ends of a pin shaft j are respectively fixed on two parallel cross beams a3, the pin shaft j is sequentially sleeved with a balance spring k, a blunt body p and a limit spring m from bottom to top, the blunt body p is of a hollow structure, an exciting magnet q is mounted on the blunt body p through a screw, the interaction force between the excited magnet i and the exciting magnet q is attractive force, and the interaction force between the excited magnet i and the limit magnet x is repulsive force.
In the invention, the piezoelectric vibrator d is in a straight structure before installation and in a bent structure after installation, the piezoelectric wafer d2 bears compressive stress, and the maximum compressive stress on the piezoelectric wafer d2 is 50% of the allowable compressive stress when the piezoelectric vibrator is not in work; the height of the top block is
Wherein: b =1- α + α β, a = α 4 (1-β) 2 -4α 3 (1-β)+6α 2 (1-β)-4α(1-β)+1，
α＝h m /H，β＝E m /E p ，h m And H is the thickness of the substrate d1 and the total thickness of the piezoelectric vibrator d, respectively, E m And E p Young's moduli, k, of the substrate d1 and the piezoelectric wafer d2, respectively 31 And
respectively, the electromechanical coupling coefficient and the allowable compressive stress of the piezoelectric ceramic material, and L is the length of the piezoelectric vibrator d.
Under the non-working state, the excitation reed e does not generate bending deformation, and the deformation and the stress state of the piezoelectric vibrators d symmetrically arranged on the two sides of the excitation reed e are respectively the same. In a working state, namely when fluid flows through the bluff body p from right to left, the bluff body p can receive the action force which is applied by the fluid and is alternated up and down, so that the bluff body p swings up and down in a reciprocating manner, and then the excitation reed e swings in a reciprocating manner under the driving of the mutual attraction between the excitation magnet q and the excited magnet i; the exciting reed e forces the piezoelectric vibrator d to generate unidirectional bending deformation through the jacking block g; when the bending deformation of the piezoelectric vibrator d on one side of the excitation reed e and the compressive stress borne by the piezoelectric wafer d2 are gradually increased, the deformation of the piezoelectric vibrator d on the other side and the compressive stress borne by the piezoelectric wafer d2 are gradually reduced; the mechanical energy is converted into electric energy in the process of alternately increasing and decreasing the compressive stress on the piezoelectric wafer d2, and the generated electric energy is used for a monitoring system after conversion treatment; when the excited magnet i contacts with a certain limiting magnet x, the pressure stress borne by the piezoelectric wafer d2 is not more than the allowable pressure stress.
In the invention, the piezoelectric vibrator d and the top block g form a spring mass system, the exciting reed e, the excited magnet i and the mass block h form a spring mass system, and the exciting magnet q, the blunt body p, the balance spring k and the limit spring m form a spring mass system, so the energy harvester is a three-degree-of-freedom system as a whole.
Claims (1)
1. The utility model provides a river is self-power supply unit for monitoring system which characterized in that: an end cover is arranged at the end part of the side wall of the shell through a screw, the outer side of the bottom wall of the shell is an arc surface, a limiting magnet is arranged at the inner side of the bottom wall of the shell, 4 lug plates are arranged at the outer side of the bottom wall of the shell, and the end parts of the 4 lug plates are connected in pairs through cross beams; the piezoelectric vibrators and the excitation reed are arranged on a boss of the end cover through screws and a pressing plate, the number of the piezoelectric vibrators on two sides of the excitation reed is equal, and gaskets are pressed between the excitation reed and fixed ends of the adjacent piezoelectric vibrators and between the fixed ends of the two adjacent piezoelectric vibrators; the piezoelectric vibrator is formed by bonding a substrate and a piezoelectric wafer, the free end of the piezoelectric vibrator is provided with a top block through a screw, the top block is positioned on one side of the substrate and abuts against an excitation reed, and the free end of the excitation reed is provided with a mass block and excited magnets through screws; the two ends of the pin shaft are respectively fixed on two parallel cross beams, the pin shaft is sequentially sleeved with a balance spring, a blunt body and a limiting spring from bottom to top, the blunt body is of a hollow structure, and an excitation magnet is mounted on the blunt body through a screw and is attracted to the excitation magnet and repelled to the limiting magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710728549.6A CN107317518B (en) | 2017-08-17 | 2017-08-17 | Self-powered device for river monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710728549.6A CN107317518B (en) | 2017-08-17 | 2017-08-17 | Self-powered device for river monitoring system |
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| CN107317518A CN107317518A (en) | 2017-11-03 |
| CN107317518B true CN107317518B (en) | 2023-03-21 |
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| CN201710728549.6A Active CN107317518B (en) | 2017-08-17 | 2017-08-17 | Self-powered device for river monitoring system |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880886B (en) * | 2019-05-18 | 2021-11-12 | 浙江师范大学 | Wind-induced vibration piezoelectric energy harvester |
| CN110880885B (en) * | 2019-05-18 | 2021-11-12 | 浙江师范大学 | Vortex-induced vibration energy harvester |
| CN112202364B (en) * | 2020-09-29 | 2022-11-01 | 长春工业大学 | Piezoelectric energy harvester for river monitoring |
| CN112234790B (en) * | 2020-10-04 | 2022-06-17 | 长春工业大学 | Water flow vibration piezoelectric electromagnetic combined type energy collecting device |
| CN114123843B (en) * | 2021-11-26 | 2023-06-06 | 浙江师范大学 | Vortex vibration type river monitoring system power supply device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205681347U (en) * | 2016-06-15 | 2016-11-09 | 浙江师范大学 | A kind of radial telescopic type piezoelectric generator of gyromagnet excitation |
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| EP1803168A4 (en) * | 2004-10-21 | 2009-05-20 | Michelin Soc Tech | A miniaturized piezoelectric based vibrational energy harvester |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205681347U (en) * | 2016-06-15 | 2016-11-09 | 浙江师范大学 | A kind of radial telescopic type piezoelectric generator of gyromagnet excitation |
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Effective date of registration: 20231213 Address after: 230000 Room 203, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Hefei Jiuzhou Longteng scientific and technological achievement transformation Co.,Ltd. Address before: 321004 Zhejiang Normal University, 688 Yingbin Avenue, Wucheng District, Jinhua City, Zhejiang Province Patentee before: ZHEJIANG NORMAL University |
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