CN107370417B - Indirect excitation piezoelectric pipeline flow energy harvester - Google Patents
Indirect excitation piezoelectric pipeline flow energy harvester Download PDFInfo
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- CN107370417B CN107370417B CN201710729647.1A CN201710729647A CN107370417B CN 107370417 B CN107370417 B CN 107370417B CN 201710729647 A CN201710729647 A CN 201710729647A CN 107370417 B CN107370417 B CN 107370417B
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- 230000005284 excitation Effects 0.000 title claims abstract description 6
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 230000003993 interaction Effects 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 5
- 235000014676 Phragmites communis Nutrition 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative 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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- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
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Abstract
The invention relates to an indirect excitation piezoelectric pipeline flow energy harvester, and belongs to the field of fluid power generation. The inner wall of the pipeline is provided with a square inner cylinder through an ear plate, and the right ends of the upper wall plate and the lower wall plate of the inner cylinder are respectively provided with a rib plate; the rib plate is provided with a bracket, a bracket bottom plate is provided with a square hole, two bracket bosses and two limiting lug plates, the square hole is positioned at the center of the bracket bottom plate, the two bracket bosses are provided with coaxial pin holes, and pin shafts are sleeved in the pin holes; the pin hole of the lever is sleeved on the pin shaft, the left arm of the lever is arranged in the inner cylinder and is longer than the right arm of the lever, and the upper side and the lower side of the end part of the left arm of the lever are provided with jacking blocks; the transducer is arranged on the support boss and is formed by bonding a base plate and a piezoelectric film, the base plate is arranged close to the support boss, the base plate is contacted with the limiting lug plate and a top block on the left arm of the lever but has no interaction force, and the transducer is not bent and deformed; the hollow blunt body is provided with a wing plate, the wing plate is connected with the right arm of the lever, the wing plate is provided with a limiting block and a spring, and the other end of the spring is propped against the bottom plate of the bracket.
Description
Technical Field
The invention belongs to the technical field of pipeline fluid power generation, and particularly relates to an indirect excitation piezoelectric pipeline fluid energy harvester which provides energy for a pipeline monitoring system.
Background
The leakage event of the long-distance pipeline for petroleum, natural gas and other fluids caused by corrosion, natural unresistance, artificial theft and other reasons occurs during the use process, and frequent pipeline leakage not only causes huge economic loss, but also causes serious pollution to the surrounding natural environment. In the past, a periodical manual inspection method is often adopted to maintain the oil and gas pipeline, but because the oil and gas pipeline is long in laying distance and is often located in the places where the trails are rare or inconvenient in traffic, leakage is difficult to discover and maintain in time due to manual periodical inspection. Accordingly, various types of pipe leak monitoring and anti-theft systems have been proposed. Although the proposed method for monitoring and alarming fluid leakage and theft prevention of certain pipelines is mature in technical level, the application of the long-distance pipeline theft prevention monitoring system in China is still in a starting stage at present, and large-area popularization and application are not obtained yet, and one of the main reasons is that the power supply problem of the monitoring system cannot be well solved: (1) the cable is high in cost and is easily cut off by lawless persons to influence the normal operation of the monitoring system; (2) the battery power supply has limited service time and needs to be replaced frequently, and once the battery power is insufficient and the battery power is not replaced in time, remote transmission of monitoring information cannot be completed. In recent years, in order to meet the self-powered requirement of a related wireless sensing monitoring system, various turbine type miniature fluid power generation devices have been proposed, and the biggest problems of the turbine type miniature fluid power generation devices are that the turbine type miniature fluid power generation devices are complex in structure, relatively large in size and not suitable for occasions with smaller pipeline diameters, and the phenomena of electromagnetic interference and the like exist in the power generation devices with certain structures, so that popularization and application are limited to a certain extent. Therefore, in order to make the leakage and theft-proof monitoring system for petroleum and natural gas pipeline practical, the power supply problem still needs to be solved.
Disclosure of Invention
The invention provides an indirect excitation piezoelectric pipeline flow energy harvester, which adopts the following implementation scheme: an inner cylinder is arranged on the inner wall of the pipeline through an ear plate, the cross section of the inner cylinder is square, and the right ends of the upper wall plate and the lower wall plate of the inner cylinder are respectively provided with a rib plate; the rib plate is provided with a bracket through a screw, the bracket bottom plate is provided with a square hole, two bracket bosses and two limiting lug plates, the square hole is positioned at the center of the bracket bottom plate, the two bracket bosses are symmetrically distributed on two sides of the square hole, the two bracket bosses are provided with coaxial pin holes, and pin shafts are sleeved in the pin holes; the pin hole of the lever is sleeved on the pin shaft, the lever passes through a square hole on the bottom plate of the bracket, the left arm of the lever is arranged in the inner cylinder, the left arm of the lever is longer than the right arm of the lever, and the upper side and the lower side of the end part of the left arm of the lever are provided with jacking blocks; the transducer is arranged on the support boss through the screw and the pressing plate, the transducer is of a cantilever beam structure and is formed by bonding a base plate and a piezoelectric film, the base plate is arranged close to the support boss, the base plate is contacted with the limiting lug plate and a top block on the left arm of the lever but has no interaction force, and the transducer is not bent and deformed; the hollow blunt body is provided with a wing plate, the wing plate is connected with the right arm of the lever through a screw, a limiting block and a spring are arranged on the wing plate through the screw, the spring is a reed and is arranged close to the wing plate, and the other end of the spring is propped against the bottom plate of the bracket.
In a non-working state, namely when fluid in the pipeline does not flow, the blunt body and the lever do not swing, the base plate is contacted with the top block and the limiting lug plate without interaction force, and the transducer does not bend and deform; when in operation, namely when fluid flows through the blunt body, the blunt body can bear the alternating acting force exerted by the fluid, so that the lever swings reciprocally around the pin shaft, the top block on the left arm of the lever forces the transducer to bend and deform, and the compressive stress on the piezoelectric film is gradually increased; when the lever is reset, the transducer is reset under the action of the self elastic force; in the resetting process of the transducer, the substrate is gradually contacted with the limiting lug plate from the fixed end, the deformation of the transducer is gradually reduced, but the reverse deformation of the piezoelectric film for bearing tensile stress does not occur; the alternating increase and decrease of the compressive stress on the piezoelectric film converts mechanical energy into electrical energy.
In the invention, when the blunt body swings around the pin shaft under the action of fluid and the limiting block is contacted with the spring or the bracket bottom plate, the maximum compressive stress on the piezoelectric film is smaller than the allowable compressive stress, and the bending deformation of the end part of the transducer is not larger than the allowable value
Wherein: b=1- α+αβ, 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 For the thickness of the substrate, H is the total thickness of the transducer, E m And E is p Young's modulus, k of substrate and piezoelectric film material respectively 31 And->
The electromechanical coupling coefficient and allowable compressive stress of the piezoelectric material, respectively, and L is the length of the transducer.
Advantages and features: (1) the fluid lifting force borne by the blunt body is utilized to generate self-excited vibration, the exciting force and the exciting frequency can be adjusted through the scale of the turbulent body, the fluid adaptability is strong, and the structure is simple; (2) the deformation of the energy converter is controllable, and the piezoelectric film only bears the compressive stress in working, so that the reliability is high; (3) the lever has an amplitude amplifying function, which is beneficial to improving the power generation capacity.
Drawings
FIG. 1 is a schematic diagram of an energy harvester according to a preferred embodiment of the invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic view of a pipeline in accordance with a preferred embodiment of the present invention;
FIG. 4 is a left side view of FIG. 3;
FIG. 5 is a schematic structural view of a bracket;
FIG. 6 is a left side view of FIG. 5;
fig. 7 is a schematic structural view of the lever.
Detailed Description
An inner cylinder a2 is arranged on the inner wall of the pipeline a through an ear plate a1, the cross section of the inner cylinder a2 is square, a rib plate a3 is arranged at the right end of an upper wall plate and a lower wall plate of the inner cylinder a2 respectively, a bracket b is arranged on the rib plate a3 through screws, a square hole b2, two bracket bosses b3 and two limiting ear plates b4 are arranged on the bracket base plate b1, the square hole b2 is positioned at the center of the bracket base plate b1, the two bracket bosses b3 are symmetrically distributed on two sides of the square hole b2, coaxial pin holes b5 are arranged on the two bracket bosses b3, and pin shafts c are sleeved in the pin holes b 5; the pin hole d1 of the lever d is sleeved on the pin shaft c, the lever d passes through the square hole b2 on the bracket bottom plate b1, the lever left arm d2 is arranged in the inner cylinder a2, the lever left arm d2 is longer than the lever right arm d3, and the upper side and the lower side of the end part of the lever left arm d2 are provided with jacking blocks d4; the transducer f is mounted on the support boss b3 through a screw and a pressing plate e, the transducer f is of a cantilever beam structure, the transducer f is formed by bonding a substrate f1 and a piezoelectric film f2, the substrate f1 is mounted close to the support boss b3, the substrate f1 is in contact with the limiting lug plate b4 and the top block d4 of the lever left arm d2, no interaction force exists between the substrate f1 and the limiting lug plate b4 and between the substrate f1 and the top block d4 of the lever left arm d2, and the transducer f does not generate bending deformation; the hollow blunt body g is provided with a wing plate g1, the wing plate g1 is connected with the right arm d3 of the lever through a screw, the wing plate g1 is provided with a limiting block h and a spring i through a screw, the spring i is a reed and is installed close to the wing plate g1, and the other end of the spring i is propped against the bottom plate b1 of the bracket.
In a non-working state, namely when fluid in the pipeline a does not flow, the blunt body g and the lever d do not swing, the base plate f1 is in contact with the top block d4 and the limiting lug plate b4 but has no interaction force, and the transducer f does not generate bending deformation; when in operation, namely when fluid flows through the blunt body g, the blunt body g can bear the alternating acting force exerted by the fluid, so that the lever d swings reciprocally around the pin shaft c, the top block d4 on the left arm d2 of the lever forces the transducer f to bend and deform, and the compressive stress on the piezoelectric film f2 is gradually increased; when the lever d is reset, the transducer f is reset under the action of the self elastic force; in the resetting process of the transducer f, the substrate f1 gradually contacts with the limiting lug plate b4 from the fixed end, the deformation of the transducer f gradually decreases, but the reverse deformation of the piezoelectric film f2 bearing the tensile stress does not occur; the mechanical energy is converted into electric energy in the process of alternately increasing and decreasing the compressive stress on the piezoelectric film f 2.
In the invention, when the blunt body g swings around the pin shaft c under the action of fluid and the limiting block h contacts the spring i or the bracket bottom plate b1, the maximum compressive stress on the piezoelectric film f2 is smaller than the allowable compressive stress, and the bending deformation of the end part of the transducer f is not larger than the allowable value
Wherein: b=1- α+αβ, 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 For the thickness of the substrate f1, H is the total thickness of the transducer f, E m And E is p Young's modulus, k of the material of the substrate f1 and the piezoelectric film f2, respectively 31 And->
The electromechanical coupling coefficient and allowable compressive stress of the piezoelectric material, respectively, L being the length of the transducer f.
Claims (1)
1. An indirect excitation piezoelectric pipeline flow energy harvester is characterized in that: an inner cylinder is arranged on the inner wall of the pipeline through an ear plate, two ends of the ear plate are respectively connected with the inner wall of the pipeline and the outer wall of the inner cylinder, the cross section of the inner cylinder is square, and the right ends of an upper wall plate and a lower wall plate of the inner cylinder are respectively provided with a rib plate; the rib plate is provided with a bracket through a screw, the bracket bottom plate is provided with a square hole, two bracket bosses and two limiting lug plates, the square hole is positioned at the center of the bracket bottom plate, the two bracket bosses and the two limiting lug plates are respectively and symmetrically distributed on two sides of the square hole, and the two bracket bosses are provided with coaxial pin holes; the lever passes through a square hole on the bottom plate of the bracket, and the pin shaft is inserted into a boss of the bracket and a pin hole of the lever; the left arm of the lever is arranged in the inner cylinder and is longer than the right arm of the lever, and the leverThe upper side and the lower side of the end part of the left arm are provided with jacking blocks; the transducer is arranged on the support boss through a screw and a pressing plate, the transducer is of a cantilever beam structure and is formed by bonding a base plate and a piezoelectric film on one side of the base plate, the base plate is arranged close to the support boss, the base plate is contacted with the limiting lug plate and a top block on the left arm of the lever but has no interaction force, and the transducer is not bent and deformed; the hollow blunt body is provided with a wing plate, the wing plate is connected with the right arm of the lever through a screw, a limiting block and a spring are arranged on the wing plate through the screw, the spring is a reed and is arranged close to the wing plate, and the other end of the spring is propped against the bottom plate of the bracket; when the blunt body arranged on the right arm of the lever swings around the pin shaft under the action of fluid and the limiting block is contacted with the spring or the bracket bottom plate, the maximum compressive stress on the piezoelectric film is smaller than the allowable compressive stress, and the bending deformation of the end part of the transducer is not larger than the allowable value
Wherein: b=1- α+αβ, 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 For the thickness of the substrate, H is the total thickness of the transducer, E m And E is p Young's modulus, k of substrate and piezoelectric film material respectively 31 And->
The electromechanical coupling coefficient and allowable compressive stress of the piezoelectric material, respectively, and L is the length of the transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710729647.1A CN107370417B (en) | 2017-08-17 | 2017-08-17 | Indirect excitation piezoelectric pipeline flow energy harvester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710729647.1A CN107370417B (en) | 2017-08-17 | 2017-08-17 | Indirect excitation piezoelectric pipeline flow energy harvester |
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| CN107370417A CN107370417A (en) | 2017-11-21 |
| CN107370417B true CN107370417B (en) | 2023-06-16 |
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| CN110932599B (en) * | 2019-05-18 | 2021-11-12 | 浙江师范大学 | Driving vibration-induced wind driven generator |
| CN112202363B (en) * | 2020-09-29 | 2022-06-17 | 长春工业大学 | Pendulum multi-vibrator series piezoelectric energy harvester |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205679601U (en) * | 2016-06-15 | 2016-11-09 | 浙江师范大学 | A kind of river monitoring device based on piezoelectric stack |
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| EP1106882A3 (en) * | 1999-12-09 | 2002-11-13 | Drei-S-Werk Präzisionswerkzeuge GmbH & Co. Fertigungs-KG | Piezo electrically actuated fluid valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205679601U (en) * | 2016-06-15 | 2016-11-09 | 浙江师范大学 | A kind of river monitoring device based on piezoelectric stack |
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