CN211183831U - Piezoelectric type multi-direction broadband vibration energy collecting device - Google Patents
Piezoelectric type multi-direction broadband vibration energy collecting device Download PDFInfo
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- CN211183831U CN211183831U CN202020083803.9U CN202020083803U CN211183831U CN 211183831 U CN211183831 U CN 211183831U CN 202020083803 U CN202020083803 U CN 202020083803U CN 211183831 U CN211183831 U CN 211183831U
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Abstract
The utility model discloses a piezoelectric multidirectional broadband vibration energy collecting device, which comprises a base, a cantilever beam, a piezoelectric ceramic piece and a permanent magnet, wherein the base consists of 4 horizontal beams distributed along the direction of an axis of a space rectangular coordinate system X, Y and 1 vertical beam along the direction of a Z axis; the root parts of the fixed ends of all the cantilever beams are adhered with piezoelectric ceramic plates, the free ends of all the cantilever beams are fixed with permanent magnets, the piezoelectric ceramic plates and the permanent magnets are sequentially arranged according to the inherent frequency, the piezoelectric ceramic plates and the permanent magnets are respectively arranged on the upper surfaces of 4 horizontal beams and four side surfaces of vertical beams, the permanent magnets at the free ends of the cantilever beams fixed on the horizontal beams are opposite to the permanent magnets at the free ends of the cantilever beams corresponding to the vertical beams, the inherent frequency of the permanent magnets is the same as that of the permanent magnets at the free ends of the cantilever beams, the inherent frequency of the permanent magnets is the same as that of the permanent. The utility model discloses can be the vibration energy of the arbitrary direction in efficient collection space, wide band scope, space utilization is high, and the practicality is strong.
Description
Technical Field
The utility model relates to a vibration energy collects the field, mainly relates to a multi-direction, broadband vibration energy collection device of piezoelectric type.
Technical Field
In daily life, a plurality of systems or devices generate vibration with different frequencies, the vibration is energy, and the vibration energy has higher energy density and certain utilization value. However, these vibrational energies tend to be overlooked and forgotten. In order to collect vibration energy in the surrounding environment, various piezoelectric vibration energy collecting techniques have been proposed.
The piezoelectric vibration energy collecting technology utilizes the positive piezoelectric effect of the piezoelectric material, that is, when the piezoelectric material is deformed to a certain degree by applying physical pressure, the electric dipole moment in the material body is shortened due to compression, and the piezoelectric material can generate equal positive and negative charges on the opposite surfaces of the material for resisting the change. In order to better apply the effect in a vibration environment, people combine a piezoelectric material with the cantilever beam type structure, stick the piezoelectric material to the position near the root of the clamping end of the cantilever beam structure, and cause the cantilever beam to generate a resonance effect through the surrounding vibration environment, so that the piezoelectric material near the root of the clamping end is deformed to generate electric energy, and the stress of the root of the clamping end of the cantilever beam structure is maximum at the moment, and the positive piezoelectric effect at the position is optimal.
Based on this, researchers have devised many different forms of piezoelectric cantilever vibration energy harvesting devices. However, most of the existing piezoelectric cantilever vibration energy collecting devices can only collect vibration energy in a single direction, and the energy collecting efficiency is limited. In addition, most piezoelectric cantilever vibration energy harvesting devices have narrow pass bands and can only harvest vibration energy in a small frequency range. For example, chinese patent publication No. CN 110282593 discloses a bidirectional vibration piezoelectric energy harvesting device, in which piezoelectric materials are distributed in the horizontal and vertical directions of a base, and the piezoelectric materials are deformed to generate electric energy by means of the deformation of the base under stress in the horizontal direction, so that the device can only harvest vibration energy in a single direction, and only when the vibration frequency of external excitation is close to or equal to the natural frequency of the beam, the cantilever beam can be caused to generate power by resonance; for example, chinese patent publication No. CN 107317511 a discloses a bistable piezoelectric energy collecting device that easily crosses a potential barrier, in which one end of a cantilever beam is fixed on a first fixing rod and a permanent magnet is disposed at a free end of the cantilever beam, and another permanent magnet is fixed on a second fixing rod and the two magnets repel each other, so that the device is only sensitive to vibration in a vertical direction, and therefore, only can collect vibration energy in the direction, and the collection frequency domain range is narrow, and the collection efficiency is not high.
Therefore, the design of the high-efficiency piezoelectric multidirectional broadband vibration energy collecting device has great research and application values.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a multi-direction, broadband vibration energy collection device of piezoelectric type can realize the high efficiency collection of the vibration energy of multi-direction, wide band territory.
In order to achieve the above object, the present invention is achieved by the following technical solutions:
The utility model provides a multidirectional, broadband vibration energy collection device of piezoelectric type which characterized in that: the device includes base, cantilever beam, piezoceramics piece, permanent magnet, the base constitute by 4 horizontal beams and 1 vertical roof beam that distribute along space rectangular coordinate system X, Y, Z axle direction, the upper surface vertical distribution of four horizontal beams that distribute along X, Y direction is a set of width thickness the same, the cantilever beam that the length is different (the cantilever beam that natural frequency is different promptly), four sides of the vertical roof beam of edge Z direction all vertical distribution are a set of width thickness the same, the cantilever beam that the length is different to corresponding with the cantilever beam on other four horizontal beams, and every group cantilever beam is arranged from inside to outside in proper order according to natural frequency's height. The root parts of the fixed support ends of all the cantilever beams are adhered with piezoelectric ceramic plates, and the free ends of all the cantilever beams are fixed with permanent magnets. The permanent magnets fixed at the free ends of the cantilever beams on the horizontal beams are opposite to the permanent magnets at the free ends of the cantilever beams on the vertical beams in pairs, the pair of magnets are used for realizing the linkage of the horizontal beams and the vertical beams, and the other pair of permanent magnets is fixed at the same height position on the opposite surfaces of every two adjacent cantilever beams on the horizontal beams. The same-name magnetic pole faces of the pair of permanent magnets are opposite to each other in pairs, and the function of the pair of permanent magnets is to realize mutual linkage between the horizontal beams.
Furthermore, the cross sections of the horizontal beams and the vertical beams are quadrilateral, the cross sections of the 4 horizontal beams are respectively fixed on the four side surfaces of the vertical beam, and the lower surfaces of the horizontal beams are superposed with the lower surfaces of the vertical beams.
Furthermore, every group cantilever beam is three, every group cantilever beam width thickness is the same, length is different, and all install perpendicularly on the rectangular beam who constitutes the base to arrange from inside to outside along the axle center in proper order according to the natural frequency height, and guarantee cantilever beam width direction perpendicular to with the length direction of place rectangular beam.
The basic principle of the device is that the vibration environment around the device is utilized to cause the cantilever beam in the device to resonate, the cantilever beam deforms due to vibration, the piezoelectric ceramic piece pasted on the cantilever beam also deforms, the piezoelectric ceramic piece deforms to generate electric energy, the generated electric energy is output and collected through the conducting wire, and then the conversion and collection of the vibration energy are completed. The device is fixed with the cantilever beam of arranging in proper order according to the magnitude of the natural frequency of cantilever beam in X, Y, Z three directions to realize installing the mutual linkage of the adjacent cantilever beam on the horizontal beam through the permanent magnet, still utilize the permanent magnet to realize installing the mutual linkage of cantilever beam on the horizontal beam and the cantilever beam of installing on vertical roof beam simultaneously. When vibration energy with any vibration frequency in any direction acts on the device, all the piezoelectric cantilever beams in two directions can be at least caused to generate electric energy due to linkage among the cantilever beams, so that the energy collection efficiency is greatly improved.
The utility model has the advantages that: the device compact structure, space utilization is high, and the practicality is strong, can the high efficiency collect the vibration energy of space arbitrary direction, frequency domain broad. The mutual linkage of the cantilever beams with different natural frequencies installed on the horizontal beam is realized, the frequency domain range of the device for collecting vibration energy is widened, the energy collecting efficiency is improved, meanwhile, the mutual linkage of the cantilever beam installed on the horizontal beam and the cantilever beam installed on the vertical beam is realized, the aim of collecting multi-direction vibration energy is realized, the energy collecting efficiency of the device is further improved, and particularly, the collecting efficiency of the vibration energy in the vertical direction is greatly improved. In addition, the device converts vibration energy in the environment into electric energy, can realize that some components and parts or equipment of low-power consumption supply energy for a long time, is pollution-free clean energy, has certain great research and using value.
Drawings
Fig. 1 is an overall schematic view of the present invention;
FIG. 2 is a schematic structural view of the base of the present invention;
Fig. 3 is a schematic diagram of the structure of a plane where a horizontal beam and a vertical beam are located (piezoelectric ceramics on the cantilever beam are not shown, S, N represents the magnetic pole direction);
Fig. 4 is a diagram of the magnetic force acting on the cantilever beam on the vertical beam of the present invention (the piezoelectric ceramic on the cantilever beam is not shown);
Fig. 5 is a simplified diagram of the magnetic force acting on the cantilever beam on the horizontal beam of the present invention (the piezoelectric ceramic on the cantilever beam is not shown);
FIG. 6 is a flow chart of the energy collection embodiment of the present invention;
In the attached figure, 1-base, 1.1-horizontal beam, 1.2-vertical beam, 2-piezoelectric ceramic plate, 3-permanent magnet, 4.1-cantilever beam on the horizontal beam and 4.2-cantilever beam on the vertical beam.
Detailed Description
The structure of the present invention will be described in detail with reference to the accompanying drawings:
As shown in fig. 1-3, the base is composed of 4 horizontal beams 1.1 and 1 vertical beam 1.2, the cross sections of the horizontal beams are quadrilateral, two horizontal beams 1.1 are respectively arranged along the X-axis direction and the Y-axis direction, a vertical beam 1.2 is arranged along the Z-axis direction, the cross sections of the 4 horizontal beams are respectively fixed on four side surfaces of the vertical beam, and the lower surface of the horizontal beam 1.1 is overlapped with the lower surface of the vertical beam 1.2. Cantilever beams 4.1 with different lengths are uniformly and vertically distributed on the upper surface of each horizontal beam 1.1, cantilever beams 4.2 with different lengths are uniformly and vertically distributed on four side surfaces of each vertical beam 1.2, the distribution rules of the cantilever beams are sequentially arranged according to the inherent frequency of the cantilever beams, piezoelectric ceramic plates 2 are adhered near the root part of the fixed end of each cantilever beam, a permanent magnet 3 is fixed at each free end, a pair of magnets 3 is arranged between every two adjacent cantilever beams 4.2 fixed on the horizontal beam 1.1 and the same-name magnetic pole surfaces of the permanent magnets 3 corresponding to the free ends of the cantilever beams 4.2 with the same inherent frequency on the vertical beam 1.2, and the magnets are also the same-name magnetic pole surfaces which are opposite to each other. The direction of the magnetic force applied to each cantilever beam is shown in the attached figures 4 and 5, and only the magnetic force between two magnets with opposite magnetic pole faces is considered here.
The vibration energy principle of the present invention is described below with reference to fig. 1, 2 and 6 as follows:
1. When no external excitation is applied, the cantilever beams are in a balanced state under the action of magnetic force, gravity and elastic force generated by elastic deformation of the cantilever beams. When the device is subjected to vibration excitation of a certain frequency along the X or Y direction, the cantilever beam 4.1 with the natural frequency close to or equal to the vibration frequency on the horizontal beam 1.1 fixed on the X or Y direction generates resonance, and the piezoelectric ceramic plate 2 at the root of the free end of the cantilever beam is deformed accordingly, so that electric energy is generated. At this moment, because the cantilever beam 4.1 vibrates, the distance between the magnets on the adjacent cantilever beams 4.1 distributed in the same direction is changed, and the magnetic force between the magnets 3 is changed, so that the balance state of the adjacent cantilever beams 4.1 in the same direction can be broken, the adjacent cantilever beams 4.1 are deformed, and finally the piezoelectric ceramic pieces 2 on all the cantilever beams 4.1 in the same direction have electric energy output, thereby widening the frequency domain range of the collecting device for collecting the vibration energy and improving the energy collecting efficiency. Meanwhile, the distance between the magnets on each horizontal beam 1.1 and the cantilever beams on the vertical beam 1.2 is changed, so that the magnetic force between the horizontal beams and the cantilever beams is changed, and therefore the cantilever beams 4.2 on the vertical beam 1.2 are also deformed under the vibration excitation in the X or Y direction, the electric energy output of the whole device is finally increased, and the energy collection efficiency of the whole device is further improved. It has thus been found that when vibrational energy at any frequency in either the X or Y direction is applied to the device, it causes all piezoelectric cantilevers in that direction to generate electrical energy, and at the same time, causes the piezoelectric cantilevers mounted on the vertical beams to generate electrical energy in a coordinated manner with that direction, greatly increasing the efficiency of energy harvesting.
2. In the same way, when the device is subjected to vibration excitation with a certain frequency along the Z direction, the cantilever beam 4.2 which is fixed on the vertical beam 1.2 and has the natural frequency close to or equal to the vibration frequency generates resonance, the cantilever beam 4.2 generates deformation due to vibration, and the distance between the magnet 3 on the cantilever beam and the magnet on the corresponding cantilever beam 4.1 fixed on the horizontal beam 1.1 is changed due to the deformation, thereby causing the magnetic force acting on the cantilever beam to change, destroying the original balance, finally causing the corresponding cantilever beam 4.1 on the horizontal beam 1.1 to be linked, when the corresponding cantilever beam 4.1 on the horizontal beam 1.1 is deformed due to linkage, the cantilever beams 4.1 at other positions on the horizontal beam 1.1 are linked, and when the cantilever beams 4.1 at other positions on the horizontal beam 1.1 are deformed due to linkage, the corresponding cantilever beams 4.2 on the vertical beam 1.2 are further linked. Therefore, vibration excitation at a certain frequency along the Z direction can cause deformation of all cantilever beams on the whole device, so that deformation of all piezoelectric ceramic plates 2 in the device is caused, and the energy collection efficiency is greatly improved.
In summary, the energy collecting device can collect vibration energy in any direction and at any vibration frequency through the linkage action caused by the change of the magnetic force, has high energy collecting efficiency, and has the best vibration energy collecting effect along the Z-axis direction.
Claims (3)
1. The utility model provides a multidirectional, broadband vibration energy collection device of piezoelectric type which characterized in that: the piezoelectric ceramic plate type cantilever beam vibration absorber comprises a base, cantilever beams, piezoelectric ceramic plates and permanent magnets, wherein the base consists of 4 horizontal beams and 1 vertical beam which are distributed along the direction of an X, Y, Z axis of a space rectangular coordinate system, a group of cantilever beams which are sequentially arranged according to the height of natural frequency are vertically arranged on the upper surfaces of the 4 horizontal beams which are distributed along the direction X, Y, a group of cantilever beams which are sequentially arranged according to the height of natural frequency are vertically arranged on four side surfaces of the vertical beam along the direction Z axis, the installation positions of the cantilever beams on the vertical beam correspond to the installation positions of the cantilever beams with the same natural frequency on the other four horizontal beams, the piezoelectric ceramic plates are adhered on the root parts of the fixed ends of all the cantilever beams, the permanent magnets are fixed on the free ends of the cantilever beams, the permanent magnets at the free ends of the cantilever beams which are arranged on the horizontal beams are opposite to the permanent magnets at the free ends, and permanent magnets with two opposite magnetic pole faces of the same name are fixed at the same height position on the opposite faces of every two adjacent cantilever beams on the horizontal beam.
2. The piezoelectric multidirectional, broadband vibration energy harvesting device of claim 1, wherein: the cross sections of the horizontal beams and the vertical beams are quadrilateral, the cross sections of the 4 horizontal beams are respectively fixed on the four side surfaces of the vertical beam, and the lower surfaces of the horizontal beams and the vertical beam are overlapped.
3. The piezoelectric multidirectional, broadband vibration energy harvesting device of claim 1 or 2, wherein: each group of cantilever beams are three, the width and the thickness of each group of cantilever beams are the same, the length of each group of cantilever beams is different, the cantilever beams are vertically arranged on the rectangular beams forming the base and are sequentially arranged from inside to outside along the axis according to the inherent frequency, and the width direction of each cantilever beam is ensured to be vertical to the length direction of the rectangular beam where the cantilever beam is located.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020083803.9U CN211183831U (en) | 2020-01-15 | 2020-01-15 | Piezoelectric type multi-direction broadband vibration energy collecting device |
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| CN202020083803.9U CN211183831U (en) | 2020-01-15 | 2020-01-15 | Piezoelectric type multi-direction broadband vibration energy collecting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049426A (en) * | 2020-01-15 | 2020-04-21 | 南昌航空大学 | Piezoelectric type multi-direction broadband vibration energy collecting device |
| CN112737405A (en) * | 2020-12-31 | 2021-04-30 | 山西大学 | Multi-direction vibration energy collection structure based on three-dimensional flexible main beam |
| CN112751505A (en) * | 2020-12-31 | 2021-05-04 | 山西大学 | Multi-direction wide band vibration energy collector based on square girder alternately |
| CN112769353A (en) * | 2020-12-31 | 2021-05-07 | 山西大学 | Annular broadband piezoelectric multidimensional vibration energy collector |
| CN112769354A (en) * | 2020-12-31 | 2021-05-07 | 山西大学 | Three-dimensional annular broadband piezoelectric vibration energy acquisition structure based on flexible main beam |
| CN112787545A (en) * | 2020-12-31 | 2021-05-11 | 山西大学 | Vibration pickup structure of vertical-crossing multi-direction broadband piezoelectric vibration energy collector |
-
2020
- 2020-01-15 CN CN202020083803.9U patent/CN211183831U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049426A (en) * | 2020-01-15 | 2020-04-21 | 南昌航空大学 | Piezoelectric type multi-direction broadband vibration energy collecting device |
| CN111049426B (en) * | 2020-01-15 | 2024-05-03 | 南昌航空大学 | Piezoelectric multidirectional and broadband vibration energy collecting device |
| CN112737405A (en) * | 2020-12-31 | 2021-04-30 | 山西大学 | Multi-direction vibration energy collection structure based on three-dimensional flexible main beam |
| CN112751505A (en) * | 2020-12-31 | 2021-05-04 | 山西大学 | Multi-direction wide band vibration energy collector based on square girder alternately |
| CN112769353A (en) * | 2020-12-31 | 2021-05-07 | 山西大学 | Annular broadband piezoelectric multidimensional vibration energy collector |
| CN112769354A (en) * | 2020-12-31 | 2021-05-07 | 山西大学 | Three-dimensional annular broadband piezoelectric vibration energy acquisition structure based on flexible main beam |
| CN112787545A (en) * | 2020-12-31 | 2021-05-11 | 山西大学 | Vibration pickup structure of vertical-crossing multi-direction broadband piezoelectric vibration energy collector |
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