CN110912449A - Piezoelectric type tunnel airflow generator - Google Patents
Piezoelectric type tunnel airflow generator Download PDFInfo
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- CN110912449A CN110912449A CN201910455601.4A CN201910455601A CN110912449A CN 110912449 A CN110912449 A CN 110912449A CN 201910455601 A CN201910455601 A CN 201910455601A CN 110912449 A CN110912449 A CN 110912449A
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- 239000000758 substrate Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 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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Abstract
The invention relates to a piezoelectric tunnel airflow generator, and belongs to the technical field of new energy. The bracket is composed of an upper beam, a lower beam and a baffle plate connected with the upper beam and the lower beam, and the upper beam and the lower beam are positioned at the same side of the baffle plate and are symmetrically configured; the shape limiting frame consists of a cross beam and shape limiting blocks at two ends of the cross beam, and arc-shaped limiting surfaces are arranged on the shape limiting blocks; the beams of the two shape limiting frames are connected through screws, the shape limiting surfaces of the two shape limiting frames are oppositely arranged, two piezoelectric vibrators and an elastic sheet are pressed between the two beams, and the piezoelectric vibrators are positioned on two sides of the elastic sheet; the piezoelectric vibrator is composed of a substrate and a piezoelectric sheet adhered to one side of the substrate; one side of the substrate is contacted with the elastic sheet, the root part of the other side of the substrate is contacted with the shape limiting surface, and the piezoelectric sheet is not contacted with the shape limiting surface; limiting blocks at two ends of the limiting frame are respectively connected with the upper beam and the lower beam, ear plates of the blunt body are arranged at the free ends of the elastic sheets, and the blunt body is arranged close to the baffle; when the elastic sheet does not work, the symmetrical central layer in the thickness direction of the elastic sheet, the central line of the blunt body and the symmetrical central layer in the width direction of the baffle are positioned in the same vertical plane.
Description
Technical Field
The invention belongs to the technical field of new energy, and particularly relates to a piezoelectric tunnel airflow generator.
Background
Tunnels have become an important component of current road and rail networks. In order to ensure that the automobiles and trains can run in the same way normally and safely and realize the real-time monitoring of the tunnel environment and the running vehicles, various instruments and lighting facilities need to be installed in the tunnel, and therefore, corresponding power supply facilities also need to be arranged in the tunnel. If the traditional cable is adopted for power supply, the difficulty of laying and subsequent maintenance of the cable is high, and the cost is high; if the battery is adopted for power supply, the battery has limited service life and needs to be replaced frequently, so that the use is extremely inconvenient, especially in remote mountainous areas.
Disclosure of Invention
The invention provides a piezoelectric tunnel airflow generator, which adopts the following implementation scheme: the support is composed of an upper beam, a lower beam and a baffle plate connected with the upper beam and the lower beam, supporting legs are arranged at two ends of the lower beam, and the upper beam and the lower beam are positioned at the same side of the baffle plate and are symmetrically arranged; the shape limiting frame consists of a cross beam and shape limiting blocks at two ends of the cross beam, wherein shape limiting surfaces are arranged on the shape limiting blocks, and the shape limiting surfaces are arc surfaces; the beams of the two shape limiting frames are connected through screws, the shape limiting surfaces of the two shape limiting frames are oppositely arranged, two piezoelectric vibrators and an elastic sheet are pressed between the two beams, and the piezoelectric vibrators are positioned on two sides of the elastic sheet; the piezoelectric vibrator is composed of a substrate and a piezoelectric sheet adhered to one side of the substrate; the distance between the two limiting blocks on the same limiting frame is narrower than the width of the substrate and the elastic sheet and wider than the width of the piezoelectric sheet, one side of the substrate is contacted with the elastic sheet, the root of the other side of the substrate is contacted with the limiting surface, and the piezoelectric sheet is not contacted with the limiting surface; the shape limiting blocks at two ends of the shape limiting frame are respectively connected with the upper beam and the lower beam through screws, the ear plate of the blunt body is installed at the free end of the elastic sheet through screws, the blunt body is a hollow cylindrical shell, and the blunt body is installed close to the baffle; when the baffle plate is not in work, the symmetrical central layer in the thickness direction of the elastic sheet, the central line of the blunt body and the symmetrical central layer in the width direction of the baffle plate are positioned in the same vertical plane; the ratio of the width of the baffle to the diameter of the bluff body, namely the width-to-diameter ratio, is 1-3, and the ratio of the minimum distance from the outer surface of the bluff body to the baffle to the diameter of the bluff body, namely the diameter-to-diameter ratio, is 0-3.
In the invention, the two shape limiting frames, the piezoelectric vibrator and the elastic sheet are installed and fixed by screws, and then the shape limiting blocks are fixed on the upper beam and the lower beam by the screws. During operation, airflow flows from the fixed end of the elastic sheet to the blunt body and the baffle plate, the airflow generates a Karman vortex street after flowing through the blunt body, the alternating generation and falling of the vortex can enable the airflow pressure on the front side and the rear side of the blunt body to change alternately, so as to generate an excitation force which enables the blunt body and the elastic sheet to swing in a reciprocating manner, the piezoelectric vibrator is forced to bend and deform in a direction which enables the piezoelectric sheet to bear pressure stress when the elastic sheet swings, and the airflow energy is converted into electric energy in the reciprocating bending deformation process of the piezoelectric vibrator; when the airflow is blocked by the baffle after passing through the blunt body, the flow direction, the vortex form and the dynamic characteristic of the airflow are changed, so that the amplitude of the exciting force is greatly increased or reduced; when the oscillating amplitude of the bluff body is large enough, the substrate of the piezoelectric vibrator is pressed on the limiting surface through the elastic sheet, and the pressure stress of each point in the length direction of the piezoelectric sheet is equal and smaller than the allowable value, so that the bluff body has larger power generation capacity and higher reliability.
In the invention, the thickness of the substrate is equal to that of the piezoelectric sheet, and the radius of the limiting surface is
Wherein h is the total thickness of the piezoelectric vibrator, β ═ Em/Ep，EmAnd EpThe modulus of elasticity, T, of the substrate and piezoelectric sheet material, respectivelypAnd k31Respectively, the allowable stress and the electromechanical coupling coefficient of the piezoelectric sheet material.
The advantages and characteristics are that the baffle arranged behind the ① blunt body can effectively adjust the coupling vibration response characteristic of the blunt body, the needed vibration amplification ratio, flow rate adaptability and power generation capability of the blunt body can be easily obtained by adjusting parameters such as minimum distance, dimension and the like of the ① blunt body, and the ② piezoelectric vibrator is subjected to unidirectional bending deformation, controllable in deformation amount and uniform in stress distribution, so that the power generation capability is strong and the reliability is high.
Drawings
FIG. 1 is a schematic diagram of a generator according to a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural view of a restraint frame according to a preferred embodiment of the present invention;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic structural view of the shape-limiting frame, the piezoelectric vibrator and the elastic piece after being mounted in a preferred embodiment of the present invention;
FIG. 6 is a schematic view of the bracket and the shape-limiting bracket after being assembled in accordance with a preferred embodiment of the present invention;
fig. 7 is a top view of fig. 6.
Detailed Description
The bracket a is composed of an upper beam a1, a lower beam a2 and a baffle a3 which connects the upper beam a1 and the lower beam a2, two ends of the lower beam a2 are provided with supporting feet a4, and the upper beam a1 and the lower beam a2 are positioned at the same side of the baffle a3 and are symmetrically configured; the shape limiting frame b is composed of a cross beam b1 and shape limiting blocks b2 at two ends of a cross beam b1, shape limiting surfaces b3 are arranged on the shape limiting blocks b2, and shape limiting surfaces b3 are circular arc surfaces; the beams b1 of the two limiting frames b are connected through screws, limiting surfaces b3 are oppositely arranged, two piezoelectric vibrators d and an elastic sheet c are pressed between the two beams b1, and the piezoelectric vibrators d are located on two sides of the elastic sheet c; the piezoelectric vibrator d is composed of a substrate d1 and a piezoelectric sheet d2 bonded to one side of the substrate d 1; the pitch of two limit blocks b2 on the same limit frame b is narrower than the width of the base plate d1 and the elastic sheet c and wider than the width of the piezoelectric sheet d2, one side of the base plate d1 is contacted with the elastic sheet c, the root of the other side is contacted with the limit surface b3, and the piezoelectric sheet d2 is not contacted with the limit surface b 3; limiting blocks b2 at two ends of the limiting frame b are respectively connected with an upper beam a1 and a lower beam a2 through screws, an ear plate e1 of a blunt body e is installed at the free end of the elastic sheet c through screws, the blunt body e is a hollow cylindrical shell, and the blunt body e is installed close to the baffle plate a 3; the symmetrical central layer in the thickness direction of the elastic sheet c, the central line of the blunt body e and the symmetrical central layer in the width direction of the baffle a3 are positioned in the same vertical plane, namely the horizontal plane z in fig. 2 when the elastic sheet is not in work; the ratio of the width H of the baffle a3 to the diameter D of the bluff body e, i.e. the ratio of the width H/D, is 1-3, and the ratio of the minimum distance L from the outer surface of the bluff body e to the baffle a3 to the diameter D of the bluff body e, i.e. the ratio of the diameter L/D, is 0-3.
In the invention, the two shape limiting frames b, the piezoelectric vibrator d and the elastic sheet c are fixedly installed by screws, and then the shape limiting block b2 is fixed on the upper beam a1 and the lower beam a2 by screws. In operation, airflow flows to the blunt body e and the baffle plate a3 from the fixed end of the elastic sheet c, the airflow generates a Karman vortex street after flowing through the blunt body e, the vortex is alternately generated and falls off to enable the airflow pressure on the front side and the rear side of the blunt body e to be alternately changed, so as to generate an excitation force for enabling the blunt body e and the elastic sheet c to swing in a reciprocating way, when the elastic sheet c swings, the piezoelectric vibrator d is forced to bend and deform in a direction that enables the piezoelectric sheet d2 to bear compressive stress, and the airflow energy is converted into electric energy in the reciprocating bending deformation process of the piezoelectric vibrator d; when the airflow is blocked by the baffle plate a3 after passing through the bluff body e, the flow direction, the vortex form and the dynamic characteristic of the airflow are changed, so that the amplitude of the exciting force is greatly increased or reduced; when the oscillating amplitude of the blunt body e is large enough, the substrate d1 of the piezoelectric vibrator d is pressed against the limit surface b3 through the elastic sheet c, and the compressive stress of each point in the length direction of the piezoelectric sheet d2 is equal to and smaller than the allowable value, so that the piezoelectric vibrator has large power generation capacity and high reliability.
In the invention, the thickness of the substrate d1 is equal to that of the piezoelectric sheet d2, and the radius of the shape limiting surface b3 is
Wherein h is the total thickness of the piezoelectric vibrator d, and β ═ Em/Ep，EmAnd EpThe elastic moduli, T, of the materials of the substrate d1 and the piezoelectric sheet d2pAnd k31The allowable stress and electromechanical coupling coefficient of the piezoelectric sheet d2 material, respectively.
Claims (1)
1. The utility model provides a piezoelectric type tunnel air current generator which characterized in that: the support is composed of an upper beam, a lower beam and a baffle plate connected with the upper beam and the lower beam, supporting legs are arranged at two ends of the lower beam, and the upper beam and the lower beam are positioned at the same side of the baffle plate and are symmetrically arranged; the shape limiting frame consists of a cross beam and shape limiting blocks at two ends of the cross beam, wherein shape limiting surfaces are arranged on the shape limiting blocks, and the shape limiting surfaces are arc surfaces; the beams of the two shape limiting frames are connected through screws, the shape limiting surfaces of the two shape limiting frames are oppositely arranged, two piezoelectric vibrators and an elastic sheet are pressed between the two beams, and the piezoelectric vibrators are positioned on two sides of the elastic sheet; the piezoelectric vibrator is composed of a substrate and a piezoelectric sheet adhered to one side of the substrate; the distance between the two limiting blocks on the same limiting frame is narrower than the width of the substrate and the elastic sheet and wider than the width of the piezoelectric sheet, one side of the substrate is contacted with the elastic sheet, the root of the other side of the substrate is contacted with the limiting surface, and the piezoelectric sheet is not contacted with the limiting surface; the shape limiting blocks at two ends of the shape limiting frame are respectively connected with the upper beam and the lower beam, the ear plate of the blunt body is arranged at the free end of the elastic sheet, the blunt body is a hollow cylindrical shell, and the blunt body is arranged close to the baffle; when the baffle plate is not in work, the symmetrical central layer in the thickness direction of the elastic sheet, the central line of the blunt body and the symmetrical central layer in the width direction of the baffle plate are positioned in the same vertical plane; the ratio of the width of the baffle to the diameter of the blunt body is 1-3, and the ratio of the minimum distance from the outer surface of the blunt body to the baffle to the diameter of the blunt body is 0-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910455601.4A CN110912449B (en) | 2019-05-18 | 2019-05-18 | Piezoelectric type tunnel airflow generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910455601.4A CN110912449B (en) | 2019-05-18 | 2019-05-18 | Piezoelectric type tunnel airflow generator |
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| Publication Number | Publication Date |
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| CN110912449A true CN110912449A (en) | 2020-03-24 |
| CN110912449B CN110912449B (en) | 2022-02-25 |
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| CN201910455601.4A Active CN110912449B (en) | 2019-05-18 | 2019-05-18 | Piezoelectric type tunnel airflow generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113364338A (en) * | 2021-07-05 | 2021-09-07 | 浙江师范大学 | High-power low-flow-rate generator |
Citations (8)
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|---|---|---|---|---|
| US5127273A (en) * | 1990-12-31 | 1992-07-07 | Lew Hyok S | Vortex generator with torsional vortex sensor |
| CN202524327U (en) * | 2012-04-23 | 2012-11-07 | 北京邮电大学 | Hand piezoelectric power generation device for remote control |
| CN104218848A (en) * | 2014-10-09 | 2014-12-17 | 吉林大学 | Self-adaptive piezoelectric generation cantilever beam |
| CN106160573A (en) * | 2016-06-15 | 2016-11-23 | 浙江师范大学 | A kind of self-excitation piezoelectric harvester for river monitoring |
| CN107332466A (en) * | 2017-08-17 | 2017-11-07 | 浙江师范大学 | A kind of many oscillator piezoelectricity Wind energy extraction devices |
| CN107359813A (en) * | 2017-08-17 | 2017-11-17 | 浙江师范大学 | A kind of tunnel driving air-flow causes the energy accumulator that shakes |
| CN107769612A (en) * | 2017-10-31 | 2018-03-06 | 长春工业大学 | A kind of raising frequency piezoelectricity electromagnetism combined generating device under vortex street excitation |
| CN207234694U (en) * | 2017-09-03 | 2018-04-13 | 朱慨迅 | One kind is without battery environmental protection remote controler |
-
2019
- 2019-05-18 CN CN201910455601.4A patent/CN110912449B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5127273A (en) * | 1990-12-31 | 1992-07-07 | Lew Hyok S | Vortex generator with torsional vortex sensor |
| CN202524327U (en) * | 2012-04-23 | 2012-11-07 | 北京邮电大学 | Hand piezoelectric power generation device for remote control |
| CN104218848A (en) * | 2014-10-09 | 2014-12-17 | 吉林大学 | Self-adaptive piezoelectric generation cantilever beam |
| CN106160573A (en) * | 2016-06-15 | 2016-11-23 | 浙江师范大学 | A kind of self-excitation piezoelectric harvester for river monitoring |
| CN107332466A (en) * | 2017-08-17 | 2017-11-07 | 浙江师范大学 | A kind of many oscillator piezoelectricity Wind energy extraction devices |
| CN107359813A (en) * | 2017-08-17 | 2017-11-17 | 浙江师范大学 | A kind of tunnel driving air-flow causes the energy accumulator that shakes |
| CN207234694U (en) * | 2017-09-03 | 2018-04-13 | 朱慨迅 | One kind is without battery environmental protection remote controler |
| CN107769612A (en) * | 2017-10-31 | 2018-03-06 | 长春工业大学 | A kind of raising frequency piezoelectricity electromagnetism combined generating device under vortex street excitation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113364338A (en) * | 2021-07-05 | 2021-09-07 | 浙江师范大学 | High-power low-flow-rate generator |
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| CN110912449B (en) | 2022-02-25 |
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