CN111641351B - Vortex vibration piezoelectric power generation device with broadband energy collection function - Google Patents
Vortex vibration piezoelectric power generation device with broadband energy collection function Download PDFInfo
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- CN111641351B CN111641351B CN202010418383.XA CN202010418383A CN111641351B CN 111641351 B CN111641351 B CN 111641351B CN 202010418383 A CN202010418383 A CN 202010418383A CN 111641351 B CN111641351 B CN 111641351B
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- 238000010248 power generation Methods 0.000 title claims abstract description 18
- 239000000919 ceramic Substances 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 238000003306 harvesting Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000008859 change 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
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008569 process Effects 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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Abstract
The invention discloses a broadband energy-collecting vortex vibration piezoelectric power generation device, which comprises a hollow cylinder; a cross beam is arranged in the hollow cylinder; two substrates are respectively arranged on the upper side and the lower side of the cross beam; piezoelectric ceramics are arranged between the two substrates; a conical spring is fixed on the base plate at one side far away from the cross beam; the top of the conical spring is fixed on the inner side wall of the hollow cylinder; linear springs are arranged between the left side and the right side of the cross beam and the inner side wall of the hollow cylinder; the beam is arranged on the central axis of the hollow cylinder. The invention directly converts the vibration energy into the electric energy, has simple structure and small energy loss.
Description
Technical Field
The invention relates to a vortex vibration power generation device, in particular to a vortex vibration piezoelectric power generation device with broadband energy collection characteristics, and belongs to the fields of hydrodynamics, wind engineering and new energy power generation.
Background
In recent years, development and utilization of new energy such as solar energy, wind energy, and water energy have become popular topics for energy development of various countries. Among these many new energy sources, wind energy and water energy generated by fluid flow have the advantages of huge reserves, wide distribution, easy development and the like, and are favored by energy developers of various countries.
Vortex-induced vibration is a common vibration phenomenon, and in a certain Reynolds coefficient range, when stable fluid bypasses a bluff body which is not streamlined, alternate vortex shedding is generated behind two sides of the bluff body, and the vortex shedding from solids has certain frequency. When this frequency is close to the natural frequency of the solid, resonance occurs, i.e., vortex-induced vibration, and energy in the fluid can be captured by the vortex-induced vibration. The vortex-induced vibration is utilized to collect energy, so that larger energy and driving force can be obtained when the fluid has lower flow speed, but an object for collecting the energy has fixed frequency and can only coincide with the vortex shedding frequency generated when the fluid flows through the surface of the object at a certain flow speed, so that the vortex-induced vibration is excited. However, in nature, the flow velocity of fluid such as wind or water is changed at any moment, and the vortex shedding frequency of the fluid flowing through the surface of an object is also changed at any moment, which severely limits the application of various vortex vibration energy collecting devices at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a broadband energy collection vortex vibration piezoelectric power generation device, which aims to solve the problem that the vortex shedding frequency changes constantly in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a broadband energy-collecting vortex vibration piezoelectric power generation device comprises a hollow cylinder; a cross beam is arranged in the hollow cylinder; two substrates are respectively arranged on the upper side and the lower side of the cross beam; piezoelectric ceramics are arranged between the two substrates; a conical spring is fixed on the base plate at one side far away from the cross beam; the top of the conical spring is fixed on the inner side wall of the hollow cylinder; linear springs are arranged between the left side and the right side of the cross beam and the inner side wall of the hollow cylinder; the beam is arranged on the central axis of the hollow cylinder.
Furthermore, a plurality of conical springs are arranged along the upper side and the lower side of the cross beam; the linear springs are arranged on the left side and the right side of the extension beam.
Furthermore, two ends of the conical spring are respectively fixed on the tray; the trays at two ends are respectively fixed on the inner side walls of the base plate and the hollow cylinder.
Furthermore, a first connecting beam is arranged on the tray close to one end of the inner side wall of the hollow cylinder; a second connecting beam is arranged on the inner side wall of the hollow cylinder; the first connecting beam is fixed on the second connecting beam through a positioning bolt.
Furthermore, a third connecting beam is arranged on the left side and the right side of the cross beam; connecting parts are fixed at two ends of the linear spring; one end of the linear spring is connected with the third connecting beam through a connecting part, and the other end of the linear spring is connected with the inner side wall of the hollow cylinder through a connecting part.
Furthermore, end covers are arranged at two ends of the hollow cylinder; a linear bearing is arranged on the outer side of the end cover; the linear bearing is provided with a guide rail; the end cover is arranged on the guide rail through a linear bearing; the end cover is also provided with a hollow chute; the guide rail is fixed on the cross beam through a shaft support; the two ends of the cross beam penetrate through the hollowed-out sliding grooves.
Furthermore, the device also comprises a rotating base and a bracket; the bracket is arranged on the rotating base; the cross beam is fixed on the bracket.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through the arrangement of the conical spring and the linear spring, the conical spring and the linear spring form a spring group with pure cubic nonlinearity, the frequency band of a hollow cylinder connected with the conical spring is widened, the problem of moment change of vortex shedding frequency is weakened, vortex-induced vibration can be generated in a wider flow velocity range, and the vibration energy generated by the vortex-induced vibration is converted into electric energy by utilizing piezoelectric ceramics, so that power generation is carried out; the invention directly converts the vibration energy into the electric energy, has simple structure and small energy loss.
Drawings
FIG. 1 is a front view of a vortex piezoelectric power generation device with broadband energy harvesting characteristics;
FIG. 2 is a disassembled schematic view of the overall structure of a vortex piezoelectric power generation device with broadband energy collection characteristics;
FIG. 3 is a front view of the interior of a hollow cylinder of a vortex piezoelectric power generation device having broadband energy harvesting characteristics;
figure 4 is a side view of the interior of a hollow cylinder of a vortex piezoelectric power generation device having broadband energy harvesting characteristics.
Reference numerals: the method comprises the following steps of 1-rotating base, 2-bracket, 3-beam, 4-shaft support, 5-guide rail, 6-linear bearing, 7-end cover, 8-hollow cylinder, 9-base plate, 10-piezoelectric ceramic, 11-cubic nonlinear spring group, 11-1-tray, 11-2-conical spring, 11-3-connecting part, 11-4-linear spring, 12-first connecting beam, 13-positioning bolt, 14-second connecting beam and 15-third connecting beam.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 4, a vortex vibration piezoelectric power generation device with broadband energy collection characteristics includes a rotating base 1, a bracket 2, a cross beam 3, a shaft support 4, a guide rail 5, a linear bearing 6, an end cover 7, a hollow cylinder 8, a substrate 9, piezoelectric ceramics 10, a cubic nonlinear spring set 11, a first connecting beam 12, a positioning bolt 13, a second connecting beam 14, and a third connecting beam 15. The cubic nonlinear spring group 11 comprises a tray 11-1, a conical spring 11-2, a connecting part 11-3 and a linear spring 11-4.
The support 2 is fixed on the rotating base 1, the support and the rotating base 1 are fixed through bolts, the rotating base 1 can rotate according to the flow velocity condition, and the device is always in the direction opposite to the incoming flow. A square cross beam 3 is arranged in a square hole at the upper end of the bracket 2 and is fixed by a fastening bolt; the power generation unit is arranged on the upper surface and the lower surface of the beam and consists of two substrates 9 and piezoelectric ceramics 10, the piezoelectric ceramics 10 is positioned between the two substrates 9 and is connected into a whole through screws, the power generation unit is fixed on the upper surface and the lower surface of the beam through screws, trays 11-1 are arranged above the power generation unit at intervals of a plurality of distances and are fastened and connected through screws; a conical spring 11-2 is welded on the tray 11-1, the other end of the conical spring 11-2 is also welded with a tray, and the tray is fixed on the connecting beam I12 through screws; the first connecting beam 12 is connected with the second connecting beam 14 through a positioning bolt 13, the distance between the two connecting beams can be changed by adjusting the positioning bolt 13, and the second connecting beam 14 is fixed on the inner wall of the hollow cylinder through a screw; two sides of the beam 3 are connected with a third connecting beam 15 which are fastened and connected through screws, two ends of the linear spring 11-4 are welded with connecting parts 11-3, one of the connecting parts 11-3 welded with two ends of the linear spring 11-4 is connected to connecting columns of the third connecting beams 15 through pins, the connecting part 11-3 can rotate around the connecting columns, and the other connecting part is fixed on a second connecting beam 14 on the inner side wall of the hollow cylinder 8 through a first connecting beam 12.
The precompression lengths of the conical spring 11-2 and the linear spring 11-4 are adjusted by adjusting the positioning bolt 3, so that the cubic nonlinear spring set 11 has pure cubic nonlinearity. Wherein the conical spring 11-2, the linear spring 11-4, the tray 11-1 and the connecting part 11-3 form a cubic nonlinear spring group, and the frequency band of the hollow cylinder connected with the cubic nonlinear spring group is widened.
The working process of the invention is as follows:
before the device is started, the positioning nut 13 is adjusted to enable the conical spring 11-2 and the linear spring 11-4 in the device to reach the set precompression length, so that the cubic nonlinear spring group in the device has pure cubic nonlinear stiffness. The rotary base 1 of the device can automatically rotate under the control of the controller according to the flow velocity condition of the outside, so that the hollow cylinder 8 of the device is just opposite to the incoming flow direction.
When the flow velocity of the outside fluid reaches a certain range, the hollow cylinder 8 can generate vortex-induced vibration, and the slide way formed by the shaft support 4, the guide rail 5 and the linear bearing 6 limits the hollow cylinder to move only up and down. The up-and-down vibration of the hollow cylinder 8 can enable the conical spring 11-2 in the device to be stressed and deformed, the conical spring 11-2 can transmit force to the piezoelectric ceramic 10 between the two substrates 9, the piezoelectric ceramic 10 is made to deform periodically, and the piezoelectric ceramic 10 deforms periodically to generate continuous and stable current.
The invention utilizes the spring group with pure cubic nonlinearity to widen the frequency band of the hollow cylinder connected with the spring group, generates vortex-induced vibration in a wider flow velocity range, and utilizes the piezoelectric ceramics to convert the vibration energy generated by the vortex-induced vibration into electric energy so as to generate electricity.
The invention connects a spring group with pure cubic nonlinear stiffness on the surface of an object, so that the frequency band of the object can be widened. Two pre-compressed conical springs and two pre-compressed linear springs are used to form a spring set that has a pure cubic non-linearity when the conical springs and linear springs are compressed to a certain value. The spring assembly is attached to the surface of the object to enable vortex-induced vibration to occur over a wide range of flow rates.
The piezoelectric ceramic is an information functional ceramic material capable of converting mechanical energy and electric energy into each other. Bound charges can appear at two ends of the polarized piezoelectric ceramic piece, a layer of free charges from the outside is adsorbed on the surface of the electrode, when the ceramic piece is deformed and compressed by external pressure, the bound charges are repelled by the charges with the same attribute in the piezoelectric ceramic piece, discharge is formed, and when the ceramic piece is deformed by tensile force, a layer of free charges from the outside can be adsorbed again. The piezoelectric ceramic has larger piezoelectric constant, elastic coefficient and electromechanical coupling coefficient, has excellent performance, and can obtain large voltage by tiny deformation.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (6)
1. A broadband energy collection vortex vibration piezoelectric power generation device is characterized by comprising a hollow cylinder; a cross beam is arranged in the hollow cylinder; two substrates are respectively arranged on the upper side and the lower side of the cross beam; piezoelectric ceramics are arranged between the two substrates; a conical spring is fixed on the base plate at one side far away from the cross beam; the top of the conical spring is fixed on the inner side wall of the hollow cylinder; linear springs are arranged between the left side and the right side of the cross beam and the inner side wall of the hollow cylinder; the cross beam is arranged on the central axis of the hollow cylinder;
end covers are arranged at two ends of the hollow cylinder; a linear bearing is arranged on the outer side of the end cover; the linear bearing is provided with a guide rail; the end cover is arranged on the guide rail through a linear bearing; the end cover is also provided with a hollow chute; the guide rail is fixed on the cross beam through a shaft support; the two ends of the cross beam penetrate through the hollowed-out sliding grooves.
2. The broadband energy harvesting piezoelectric vortex generator according to claim 1, wherein a plurality of conical springs are arranged along the upper and lower sides of the beam; the linear springs are arranged on the left side and the right side of the extension beam.
3. The broadband energy harvesting piezoelectric vortex generator according to claim 1, wherein two ends of the conical spring are fixed to the tray respectively; the trays at two ends are respectively fixed on the inner side walls of the base plate and the hollow cylinder.
4. The broadband energy harvesting piezoelectric vortex generator according to claim 3, wherein the tray near one end of the inner side wall of the hollow cylinder is provided with a first connecting beam; a second connecting beam is arranged on the inner side wall of the hollow cylinder; the first connecting beam is fixed on the second connecting beam through a positioning bolt.
5. The broadband energy harvesting piezoelectric vortex generator according to claim 1, wherein a third connecting beam is mounted on each of the left and right sides of the cross beam; connecting parts are fixed at two ends of the linear spring; one end of the linear spring is connected with the third connecting beam through a connecting part, and the other end of the linear spring is connected with the inner side wall of the hollow cylinder through a connecting part.
6. The broadband energy harvesting piezoelectric vortex generator according to claim 1, further comprising a rotating base, a support; the bracket is arranged on the rotating base; the cross beam is fixed on the bracket.
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| CN202010418383.XA CN111641351B (en) | 2020-05-18 | 2020-05-18 | Vortex vibration piezoelectric power generation device with broadband energy collection function |
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| CN113364351B (en) * | 2021-07-05 | 2022-12-20 | 浙江师范大学 | Device and method for collecting electric energy by using double-cone streaming vortex-induced vibration |
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| CN103516257A (en) * | 2012-06-21 | 2014-01-15 | 通用电气公司 | Tunable vibration energy harvester and method |
| CN203009151U (en) * | 2012-12-12 | 2013-06-19 | 山东科技大学 | Small piezoelectric type wave power generation device |
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