CN107359819B - Pipeline flows energy harvester - Google Patents
Pipeline flows energy harvester Download PDFInfo
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- CN107359819B CN107359819B CN201710728641.2A CN201710728641A CN107359819B CN 107359819 B CN107359819 B CN 107359819B CN 201710728641 A CN201710728641 A CN 201710728641A CN 107359819 B CN107359819 B CN 107359819B
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- 210000000883 ear external Anatomy 0.000 claims abstract description 11
- 210000003027 ear inner Anatomy 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 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
- 239000012530 fluid Substances 0.000 abstract description 22
- 238000010248 power generation Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000005452 bending Methods 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
- 239000007789 gas Substances 0.000 description 1
- 238000012423 maintenance 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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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Pipeline Systems (AREA)
Abstract
The invention relates to a pipeline flow energy harvester, and belongs to the field of fluid power generation. The frame bottom plate with the inner ear plate and the outer ear plate is arranged on the cross beam of the pipeline; the left end of the rocker arm of the exciter is provided with a rocker arm ear plate, the right end of the rocker arm is provided with a blunt body, the front side and the rear side of the rocker arm are provided with cams, the shaft hole of the rocker arm is sleeved on a rotating shaft, and the rotating shaft is fixed on the outer ear plate; the inner ear plate and the rocker arm ear plate are provided with pin shafts, and two ends of the spring are connected to the pin shafts; transducers are arranged on the upper side and the lower side of the frame bottom plate, a base plate of each transducer is arranged close to the frame bottom plate, and the free ends of the transducers are propped against the cams; the profile curve of the cam comprises two sections of arc profiles concentric with the shaft hole, and the arc profiles are the shortest distance from the center of the shaft hole on the profile curve of the cam; the transducer is in a straight structure before being installed and in a curved structure after being installed, and the free end of the transducer is in contact with the contour vertex of the cam; the profile apex is the point on the profile curve of the cam that is furthest from the center of the shaft bore, and the amount of deformation of the transducer when in contact with the profile apex is greatest.
Description
Technical Field
The invention belongs to the technical field of pipeline fluid power generation and pipeline monitoring, and particularly relates to a pipeline fluid energy harvester.
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 periodic manual inspection method is often adopted for maintenance, but because the oil and gas pipeline is long in laying distance and 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 the manual periodic 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 a pipeline flow energy harvester, which adopts the following implementation scheme: a cross beam is arranged in the pipeline, a frame bottom plate, two inner ear plates and two outer ear plates are arranged on the frame, and the frame bottom plate is arranged on the cross beam through screws; the left end of the rocker arm of the exciter is provided with two rocker arm ear plates, the right end of the rocker arm is provided with a hollow blunt body, the front side and the rear side of the rocker arm are provided with cams, the shaft hole of the rocker arm is sleeved on a rotating shaft, and the two ends of the rotating shaft are respectively fixed on the two outer ear plates; the inner ear plate and the rocker arm ear plate are provided with pin shafts, and two ends of the spring are respectively connected to the two pin shafts; the upper side and the lower side of the frame bottom plate are provided with transducers through screws and pressing plates, the transducers are formed by bonding a base plate and a piezoelectric film, the base plate is arranged close to the frame bottom plate, and the free ends of the transducers are propped against the cam; the profile curve of the cam comprises two sections of arc profiles concentric with the shaft hole, and the arc profiles are the shortest distance from the center of the shaft hole on the profile curve of the cam; the transducer is in a straight structure before being installed and in a curved structure after being installed, and the free end of the transducer is in contact with the contour vertex of the cam; the profile vertex is positioned at the left side of the shaft hole, the profile vertex is the point with the longest distance from the center of the shaft hole on the profile curve of the cam, the deformation amount is the largest when the transducer is contacted with the profile vertex, and the deformation of the free end of the transducer is reduced when the cam rotates clockwise and anticlockwise around the rotating shaft; when the free end of the transducer is contacted with the arc profile, the transducer is not bent and deformed, and the stress on the piezoelectric film is equal and zero.
When the end of the transducer contacts with the peak of the cam, the maximum compressive stress on the piezoelectric film is smaller than the allowable value, and the deformation of the end of the transducer is smaller 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.
In a non-working state, namely when fluid in the pipeline does not flow, the exciter is in a balanced state under the action of gravity, fluid buoyancy and spring elasticity of the exciter, transducers on the upper side and the lower side of the bottom plate of the frame are contacted with the top points of the cams, and the deformation and stress distribution states of the two transducers are the same respectively; when the device works, namely when fluid flows through the disturbing fluid, the disturbing fluid can bear the up-down alternating acting force exerted by the fluid, so that the rocker arm and the cam swing back and forth around the rotating shaft, when the cam rotates around the rotating shaft clockwise and anticlockwise, the deformation of the end part of the transducer and the compressive stress on the piezoelectric film are gradually reduced, and when the transducer contacts with the circular arc profile, the deformation of the transducer is zero; in contrast, in the cam resetting process, the deformation of the end part of the energy converter and the compressive stress on the piezoelectric film are gradually increased, and when the free end of the energy converter is in contact with the contour vertex of the cam, the deformation of the energy converter and the compressive stress on the piezoelectric film are maximum; the alternating increase and decrease of the compressive stress on the piezoelectric film converts mechanical energy into electrical energy.
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 piezoelectric film only bears the compressive stress in the working process, so that the reliability is high; (3) the deformation of the transducer is determined by the profile curve of the actuator cam, further improving reliability.
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 diagram of the structure of an actuator in accordance with 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 frame.
Detailed Description
A cross beam a1 is arranged in the pipeline a, a frame bottom plate b1, two inner ear plates b2 and two outer ear plates b3 are arranged on the frame b, and the frame bottom plate b1 is arranged on the cross beam a1 through screws; the left end of a rocker arm c1 of the exciter c is provided with two rocker arm ear plates c2, the right end of the rocker arm c is provided with a hollow blunt body c3, the front side and the rear side of the rocker arm are provided with cams c4, a shaft hole c5 of the rocker arm c1 is sleeved on a rotating shaft d, and two ends of the rotating shaft d are respectively fixed on the two outer ear plates b 3; the inner ear plate b2 and the rocker arm ear plate c2 are provided with pin shafts d ', and two ends of a spring e are respectively connected to the two pin shafts d'; the upper side and the lower side of the frame bottom plate b1 are provided with a transducer h through a screw and a pressing plate f, the transducer h is formed by bonding a base plate h1 and a piezoelectric film h2, the base plate h1 is arranged close to the frame bottom plate b1, and the free end of the transducer h is propped against a cam c 4; the profile curve of the cam c4 comprises two sections of arc profiles c6 and c7 concentric with the shaft hole c5, and the arc profiles c6 and c7 are the shortest distance from the center of the shaft hole c5 on the profile curve of the cam c 4; the transducer h is of a straight structure before installation and of a curved structure after installation, and the free end of the transducer h is in contact with the contour vertex T of the cam c 4; the profile vertex T is positioned at the left side of the shaft hole c5, the profile vertex T is the point with the longest distance from the center of the shaft hole c5 on the profile curve of the cam c4, the deformation amount of the transducer h is the largest when the transducer h contacts with the profile vertex T, and the deformation of the free end of the transducer h is reduced when the cam c4 rotates clockwise and anticlockwise around the rotating shaft d; when the free end of the transducer h is contacted with the circular arc profiles c6 and c7, the transducer h does not bend and deform (theoretically, the transducer h can interfere with an exciter and cannot contact with the circular arc profiles), and the stress on the piezoelectric film h2 is equal and zero.
When the free end of the transducer h contacts with the contour vertex T of the cam c4, the maximum compressive stress on the piezoelectric film h2 is smaller than the allowable compressive stress, and the bending deformation of the end part of the transducer h 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 H1, H is the total thickness of the transducer H, E m And E is p Young's modulus, k of the material of the substrate h1 and the piezoelectric film h2, respectively 31 And->
The electromechanical coupling coefficient and allowable compressive stress of the piezoelectric material, respectively, L is the length of the transducer h.
In a non-working state, namely when fluid in the pipeline a does not flow, the exciter c is in a balanced state under the action of gravity of the exciter c, buoyancy of the fluid and elasticity of the spring e, transducers h on the upper side and the lower side of the bottom plate b1 of the frame are in contact with the top point T of the cam, and deformation and stress distribution states of the two transducers h are the same respectively; when the device works, namely when fluid flows through the disturbing fluid c3, the disturbing fluid c3 is subjected to alternating acting force exerted by the fluid, so that the rocker arm c1 and the cam c4 swing reciprocally around the rotating shaft d, when the cam c4 rotates clockwise and anticlockwise around the rotating shaft d, the deformation of the end part of the transducer h and the compressive stress on the piezoelectric film h2 are gradually reduced, and when the transducer h contacts with the arc profile c6 or c7, the deformation of the transducer h is zero; in contrast, in the resetting process of the cam c4, the deformation of the end part of the transducer h and the compressive stress on the piezoelectric film h2 are gradually increased, and when the free end of the transducer h is in contact with the contour vertex T of the cam c4, the deformation of the transducer h and the compressive stress on the piezoelectric film h2 are maximized; the mechanical energy is converted into electric energy in the process of alternately increasing and decreasing the compressive stress on the piezoelectric film h 2.
Claims (1)
1. The utility model provides a pipeline flows energy harvester which characterized in that: a cross beam is arranged in the pipeline, the cross beam is positioned at the outlet end of the pipeline, and two ends of the cross beam are directly machined from the inner wall of the pipeline; the frame is provided with a frame bottom plate, two inner ear plates and two outer ear plates, the inner ear plates and the outer ear plates are positioned on the same side of the frame bottom plate, and twoThe inner ear plate is positioned between the two outer ear plates and is shorter than the outer ear plates; the frame bottom plate is arranged on one side of the cross beam, which is close to the pipeline inlet, through screws; the left end of the rocker arm of the exciter is provided with two rocker arm ear plates, the right end of the rocker arm is provided with a hollow blunt body, the front side and the rear side of the rocker arm are provided with cams, the shaft hole of the rocker arm is sleeved on the rotating shaft, the shaft hole of the rocker arm is positioned between the rocker arm ear plates and the blunt body, and the two ends of the rotating shaft are respectively fixed at the free ends of the two outer ear plates; the inner ear plate and the rocker arm ear plate are provided with pin shafts, and two ends of the spring are respectively connected to the two pin shafts; the upper side and the lower side of the frame bottom plate are provided with transducers through screws and pressing plates, the transducers are formed by bonding a substrate and a piezoelectric film on one side of the transducers, the substrate at the fixed end of each transducer is contacted with the frame bottom plate, the piezoelectric film is contacted with the pressing plates, and the free ends of the transducers are propped against the cams; the profile curve of the cam comprises two sections of arc profiles concentric with the shaft hole, and the arc profiles are the shortest distance from the center of the shaft hole on the profile curve of the cam; the transducer is in a straight structure before installation and in a bent structure after installation, the free end of the transducer is in contact with the contour vertex of the cam, the maximum compressive stress on the piezoelectric film is smaller than the allowable value of the piezoelectric film, and the deformation of the end part of the transducer is smaller than the allowable value of the piezoelectric film
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 are respectively, and L is the length of the transducer; in the length direction of the rocker arm, the contour peak is positioned at the left side of the shaft hole, and the contour peak is the distance on the contour curve of the camThe deformation amount is the largest when the transducer contacts with the top point of the profile at the point with the longest center distance of the shaft hole, and the deformation of the free end of the transducer is reduced when the cam rotates clockwise and anticlockwise around the rotating shaft; when the free end of the transducer is contacted with the arc profile, the transducer is not bent and deformed, and the stress on the piezoelectric film is equal and zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710728641.2A CN107359819B (en) | 2017-08-17 | 2017-08-17 | Pipeline flows energy harvester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710728641.2A CN107359819B (en) | 2017-08-17 | 2017-08-17 | Pipeline flows energy harvester |
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| Publication Number | Publication Date |
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| CN107359819A CN107359819A (en) | 2017-11-17 |
| CN107359819B true CN107359819B (en) | 2023-06-16 |
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| CN201710728641.2A Active CN107359819B (en) | 2017-08-17 | 2017-08-17 | Pipeline flows energy harvester |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110808692B (en) * | 2019-05-18 | 2021-10-08 | 浙江师范大学 | Vortex-induced vibration type piezoelectric generator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801360A (en) * | 2012-09-01 | 2012-11-28 | 浙江师范大学 | Disk cam excited and limited high-power rotary piezoelectric wind generator |
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| FR3029241B1 (en) * | 2014-12-01 | 2019-05-03 | Gilles Grosso | APPARATUS FOR CONVERTING HOT ENERGY IN ELECTRICAL ENERGY |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801360A (en) * | 2012-09-01 | 2012-11-28 | 浙江师范大学 | Disk cam excited and limited high-power rotary piezoelectric wind generator |
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| CN107359819A (en) | 2017-11-17 |
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