Annular broadband piezoelectric multi-dimensional vibration energy collector

Abstract

The invention discloses an annular broadband piezoelectric multi-dimensional vibration energy collector. The collector comprises an inner rigid main beam; the outer flexible main beam is coaxially arranged outside the inner rigid main beam in a sleeving manner, and a gap is formed between the outer wall of the inner rigid main beam and the inner wall of the outer flexible main beam; the flexible annular strip is arranged in a gap between the inner rigid main beam and the outer flexible main beam, the flexible annular strip and the gap are each of an annular wave-shaped structure, the wave crest of the outer wall of the flexible annular strip is fixed to the wave crest of the inner wall of the outer flexible main beam, and the wave crest of the inner wall of the flexible annular strip is fixed to the wave crest of the outer wall of the inner rigid main beam; the plurality of groups of piezoelectric acquisition modules are respectively arranged at wave troughs of the inner wall and the outer wall of the flexible annular strip; and a plurality of groups of piezoelectric acquisition rods are axially fixed on the top surface of the inner rigid main beam and the top surface of the outer flexible main beam at equal intervals respectively. According to the invention, an additional acquisition device is not needed, the size of the device is greatly reduced, and the manufacturing cost of the device is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-electromechanical devices, and in particular to an annular broadband piezoelectric multi-dimensional vibration energy harvester. Background Art

[0002] With the widespread deployment of wireless sensor networks in field environments and industrial monitoring, as well as the rapid development of wearable devices and portable medical electronic systems, the power supply of wireless sensor network nodes and micro-electronic devices in special fields has become a key issue to further promote their application. Traditional power supply has some insurmountable defects, such as the large size, short life, environmental pollution of chemical batteries, and the difficulty of connecting wired power supplies. Therefore, collecting energy from the surrounding environment and converting it into electrical energy to meet the self-powered needs of wireless sensor networks or micro-electronic devices in special fields has become a research hotspot. Among them, vibration energy, as the most common form of energy in the environment, is widely present in the natural environment (such as wind-induced vibration, animal movement, etc.) and in the human living and production environment (such as human movement, transportation tools such as cars and trains, bridges, industrial and mining equipment, etc.). Compared with environmental energy forms such as solar energy and wind energy, vibration energy has obvious power supply advantages for wireless sensor networks and micro-electronic devices in special fields. As long as there is vibration in the outside world, energy can be continuously collected and supplemented through energy harvesting devices. Therefore, the collection and utilization of vibration energy has great practical value. At present, the device used to collect vibration energy is called a vibration energy harvester, which generally realizes vibration energy collection in a single direction within a specific frequency range. Therefore, there are problems such as a narrow working frequency band, a high resonant frequency, and a single energy collection direction. At the same time, when the device faces a complex vibration environment when collecting vibration energy, the vibration frequency is random and variable, resulting in extremely low energy collection efficiency and extremely poor output stability and continuity, and insufficient environmental applicability. To address this problem, the application document with publication number CN112769353A discloses an annular broadband piezoelectric multi-dimensional vibration energy harvester. In this scheme, an annular setting is adopted, and energy can be collected in three dimensions. However, in this scheme, eight groups of collection rods are used to collect energy on the horizontal plane. If the collection accuracy needs to be further improved, additional collection rods need to be added. Therefore, the overall device is relatively complicated and not lightweight enough. Based on this, the present invention provides an annular broadband piezoelectric multi-dimensional vibration energy harvester. Summary of the invention

[0003] The purpose of the present invention is to provide a ring-shaped broadband piezoelectric multi-dimensional vibration energy harvester to solve the problems existing in the prior art.

[0004] To achieve the above object, the present invention provides the following solution: The present invention provides a ring-shaped broadband piezoelectric multi-dimensional vibration energy harvester, comprising:

[0005] An inner rigid main beam, wherein the inner rigid main beam is a ring structure;

[0006] An outer flexible main beam, the outer flexible main beam is an annular structure, the outer flexible main beam is coaxially sleeved outside the inner rigid main beam, and a gap is provided between the outer wall of the inner rigid main beam and the inner wall of the outer flexible main beam;

[0007] A flexible annular strip, wherein the flexible annular strip is arranged in the interval between the inner rigid main beam and the outer flexible main beam, the flexible annular strip and the interval are both annular wave-shaped structures, and the wave crest of the outer wall of the flexible annular strip is fixed to the wave crest of the inner wall of the outer flexible main beam, and the wave crest of the inner wall is fixed to the wave crest of the outer wall of the inner rigid main beam;

[0008] Piezoelectric collection modules, wherein the piezoelectric collection modules are provided in a plurality of groups, and the plurality of groups of the piezoelectric collection modules are respectively arranged at the troughs of the inner wall and the outer wall of the flexible annular strip;

[0009] Piezoelectric collection rods, a plurality of groups of piezoelectric collection rods are fixed axially at equal intervals on the top surface of the inner rigid main beam and the top surface of the outer flexible main beam, and the piezoelectric collection rods on the inner rigid main beam and the outer flexible main beam are staggered.

[0010] According to the annular broadband piezoelectric multi-dimensional vibration energy harvester provided by the present invention, the piezoelectric harvesting module includes a flexible piezoelectric sheet and a flexible conductive sheet, the flexible conductive sheets are respectively attached to the inner wall and the outer wall of the flexible annular strip, and the flexible piezoelectric sheet is attached to the flexible conductive sheet.

[0011] According to the annular broadband piezoelectric multi-dimensional vibration energy harvester provided by the present invention, the piezoelectric harvesting rod includes a main core rod, a flexible piezoelectric layer and a flexible conductive layer, the main core rod is vertically fixed to the top surface of the inner rigid main beam and the top surface of the outer flexible main beam respectively, the flexible piezoelectric layer is coated on the outer wall of the main core rod, and the flexible conductive layer is arranged between the main core rod and the flexible piezoelectric layer.

[0012] According to the annular broadband piezoelectric multi-dimensional vibration energy harvester provided by the present invention, the inner diameter of the inner rigid main beam is 30 mm, the outer diameter of the outer flexible main beam is 100 mm, and the thickness of the inner rigid main beam and the outer flexible main beam are both 5 mm.

[0013] According to the annular broadband piezoelectric multi-dimensional vibration energy harvester provided by the present invention, the material of the outer flexible main beam is one or two of PDMS, polymethyl methacrylate and natural rubber.

[0014] According to the annular broadband piezoelectric multi-dimensional vibration energy harvester provided by the present invention, the material of the main core rod is one of PDMS, polymethyl methacrylate and natural rubber.

[0015] According to the annular broadband piezoelectric multi-dimensional vibration energy harvester provided by the present invention, the material of the flexible piezoelectric sheet and the flexible piezoelectric layer is one or more of PVDF, PZT, and ZnO.

[0016] According to the annular broadband piezoelectric multi-dimensional vibration energy harvester provided by the present invention, the material of the flexible conductive sheet and the flexible conductive layer is one or more of thin aluminum foil and copper foil.

[0017] The present invention discloses the following technical effects:

[0018] In the present invention, the outer flexible main beam transmits vibration energy to the piezoelectric collection rod and the flexible annular strip under the action of external vibration. The piezoelectric collection rod is deformed by vibration to generate an electrical signal. The deformation of the flexible annular strip causes some of the trough positions therein to produce different degrees of compression and stretching, and the overall deformation is interrelated. The deformation of a single waveform structure is directly related to the synchronous deformation of the surrounding area. At the same time, when the system operating frequency band needs to be widened, it can be achieved by simply increasing the density of the waveform structure of the flexible annular strip, without the need for additional collection devices, which greatly reduces the volume of the device and reduces the manufacturing cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the annular broadband piezoelectric multi-dimensional vibration energy harvester of the present invention;

[0021] Figure 2 It is a schematic diagram of the arrangement structure of the piezoelectric collection rods of the present invention on the inner rigid main beam and the outer flexible main beam;

[0022] Figure 3 It is a schematic structural diagram of the piezoelectric collection rod of the present invention.

[0023] Among them, 1. inner rigid main beam; 2. outer flexible main beam; 3. spacer; 4. flexible annular strip; 5. flexible piezoelectric sheet; 6. flexible conductive sheet; 7. main core rod; 8. flexible piezoelectric layer; 9. flexible conductive layer. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Reference Figure 1-Figure 3 The present invention provides a ring-shaped broadband piezoelectric multi-dimensional vibration energy harvester, comprising:

[0027] The inner rigid main beam 1 is a ring structure;

[0028] An outer flexible main beam 2, which is a ring-shaped structure, is coaxially sleeved outside the inner rigid main beam 1, and a gap 3 is provided between the outer wall of the inner rigid main beam 1 and the inner wall of the outer flexible main beam 2;

[0029] A flexible annular strip 4, the flexible annular strip 4 is arranged in the interval 3 between the inner rigid main beam 1 and the outer flexible main beam 2, the flexible annular strip 4 and the interval 3 are both annular wave-shaped structures, and the wave crest of the outer wall of the flexible annular strip 4 is fixed to the wave crest of the inner wall of the outer flexible main beam 2, and the wave crest of the inner wall is fixed to the wave crest of the outer wall of the inner rigid main beam 1;

[0030] Piezoelectric collection modules, the piezoelectric collection modules are provided in several groups, and the several groups of piezoelectric collection modules are respectively arranged at the troughs of the inner wall and the outer wall of the flexible annular strip 4;

[0031] Piezoelectric collection rods: a plurality of groups of piezoelectric collection rods are fixed axially at equal intervals on the top surfaces of the inner rigid main beam 1 and the outer flexible main beam 2, and the piezoelectric collection rods on the inner rigid main beam 1 and the outer flexible main beam 2 are staggered.

[0032] In the present invention, the outer flexible main beam 2 transmits vibration energy to the piezoelectric collection rod and the flexible annular strip 4 under the action of external vibration. The piezoelectric collection rod is deformed by vibration to generate an electrical signal. The deformation of the flexible annular strip 4 causes some of the trough positions to produce different degrees of compression and stretching, and the overall deformation is interrelated. The deformation of a single waveform structure will directly relate to the synchronous deformation of the surrounding. At the same time, when it is necessary to broaden the operating frequency band of the system, it is only necessary to increase the density of the waveform structure of the flexible annular strip 4. No additional collection device is required, which greatly reduces the volume of the device and reduces the manufacturing cost of the device. The flexible annular strip 4 and the piezoelectric collection rod can cooperate to collect energy in two vertical spaces, realize multi-dimensional energy collection, and ensure the range of energy collection.

[0033] According to a further optimized solution, the piezoelectric collection module includes a flexible piezoelectric sheet 5 and a flexible conductive sheet 6 . The flexible conductive sheet 6 is respectively attached to the inner wall and the outer wall of the flexible annular strip 4 , and the flexible piezoelectric sheet 5 is attached to the flexible conductive sheet 6 .

[0034] A further optimized solution is that the piezoelectric collection rod includes a main core rod 7, a flexible piezoelectric layer 8 and a flexible conductive layer 9. The main core rod 7 is vertically fixed on the top surface of the inner rigid main beam 1 and the top surface of the outer flexible main beam 2, respectively. The flexible piezoelectric layer 8 is coated on the outer wall of the main core rod 7, and the flexible conductive layer 9 is arranged between the main core rod 7 and the flexible piezoelectric layer 8.

[0035] According to the further optimization scheme, the inner diameter of the inner rigid main beam 1 is 30 mm, the outer diameter of the outer flexible main beam 2 is 100 mm, and the thickness of the inner rigid main beam 1 and the outer flexible main beam 2 are both 5 mm.

[0036] According to a further optimization scheme, the material of the outer flexible main beam 2 is one or two of PDMS, polymethyl methacrylate and natural rubber.

[0037] According to a further optimization scheme, the material of the main core rod 7 is one of PDMS, polymethyl methacrylate and natural rubber.

[0038] According to a further optimization scheme, the material of the flexible piezoelectric sheet 5 and the flexible piezoelectric layer 8 is one or more of PVDF, PZT, and ZnO.

[0039] In a further optimized solution, the material of the flexible conductive sheet 6 and the flexible conductive layer 9 is one or more of thin aluminum foil and copper foil.

[0040] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A ring-shaped broadband piezoelectric multi-dimensional vibration energy harvester, characterized in that: include: An inner rigid main beam (1), wherein the inner rigid main beam (1) is a ring-shaped structure; An outer flexible main beam (2), the outer flexible main beam (2) is an annular structure, the outer flexible main beam (2) is coaxially sleeved outside the inner rigid main beam (1), and a spacer (3) is provided between the outer wall of the inner rigid main beam (1) and the inner wall of the outer flexible main beam (2); A flexible annular strip (4), wherein the flexible annular strip (4) is arranged in the interval (3) between the inner rigid main beam (1) and the outer flexible main beam (2), the flexible annular strip (4) and the interval (3) are both annular wave-shaped structures, and the wave crests of the outer wall of the flexible annular strip (4) are fixed to the wave crests of the inner wall of the outer flexible main beam (2), and the wave crests of the inner wall are fixed to the wave crests of the outer wall of the inner rigid main beam (1); Piezoelectric collection modules, wherein the piezoelectric collection modules are provided in a plurality of groups, and the plurality of groups of piezoelectric collection modules are respectively arranged at the troughs of the inner wall and the outer wall of the flexible annular strip (4); Piezoelectric collection rods, a plurality of groups of piezoelectric collection rods are fixed axially at equal intervals on the top surface of the inner rigid main beam (1) and the top surface of the outer flexible main beam (2), and the piezoelectric collection rods on the inner rigid main beam (1) and the outer flexible main beam (2) are staggered.

2. The annular broadband piezoelectric multi-dimensional vibration energy harvester according to claim 1, characterized in that: The piezoelectric acquisition module comprises a flexible piezoelectric sheet (5) and a flexible conductive sheet (6), wherein the flexible conductive sheet (6) is respectively attached to the inner wall and the outer wall of the flexible annular strip (4), and the flexible piezoelectric sheet (5) is attached to the flexible conductive sheet (6).

3. The annular broadband piezoelectric multi-dimensional vibration energy harvester according to claim 2, characterized in that: The piezoelectric collection rod comprises a main core rod (7), a flexible piezoelectric layer (8) and a flexible conductive layer (9); the main core rod (7) is vertically fixed to the top surface of the inner rigid main beam (1) and the top surface of the outer flexible main beam (2), respectively; the flexible piezoelectric layer (8) is coated on the outer wall of the main core rod (7); and the flexible conductive layer (9) is arranged between the main core rod (7) and the flexible piezoelectric layer (8).

4. The annular broadband piezoelectric multi-dimensional vibration energy harvester according to claim 1, characterized in that: The inner diameter of the inner rigid main beam (1) is 30 mm, the outer diameter of the outer flexible main beam (2) is 100 mm, and the thickness of the inner rigid main beam (1) and the outer flexible main beam (2) are both 5 mm.

5. The annular broadband piezoelectric multi-dimensional vibration energy harvester according to claim 1, characterized in that: The material of the outer flexible main beam (2) is one or two of PDMS, polymethyl methacrylate and natural rubber.

6. The annular broadband piezoelectric multi-dimensional vibration energy harvester according to claim 1, characterized in that: The material of the main core rod (7) is one of PDMS, polymethyl methacrylate and natural rubber.

7. The annular broadband piezoelectric multi-dimensional vibration energy harvester according to claim 3, characterized in that: The material of the flexible piezoelectric sheet (5) and the flexible piezoelectric layer (8) is one or more of PVDF, PZT, and ZnO.

8. The annular broadband piezoelectric multi-dimensional vibration energy harvester according to claim 3, characterized in that: The material of the flexible conductive sheet (6) and the flexible conductive layer (9) is one or more of thin aluminum foil and copper foil.

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