Vibration energy recovery device and vibration source

Abstract

The vibration energy recovery device and the vibration source provided by the embodiments of the present disclosure include: an energy collection mechanism, which is used to collect vibration energy of a vibration source and convert the vibration energy into alternating current power, the energy collection mechanism includes a spacing adjustable assembly; a working frequency band adjusting mechanism, which is used to adjust the relative spacing of components in the spacing adjustable assembly, so as to adjust the working frequency band of the energy collection mechanism; and an energy processing module, which is used to convert the alternating current power collected by the energy collection mechanism into direct current power and output to a load. In the device of the embodiments of the present disclosure, the equivalent stiffness of the spacing adjustable assembly changes with the vibration of the vibration source, so as to realize wide-frequency vibration energy recovery, and the device of the embodiments of the present disclosure has a wide range of applications and can be applied to the recovery of vibration energy of different working frequency bands.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy recovery, and in particular to a vibration energy recovery device and a vibration source having the vibration energy recovery device. Background Art

[0002] At present, most vibration energy recovery devices are fixed-stiffness devices with a constant natural frequency, a narrow operating frequency band and cannot be adjusted. However, the vibration frequency of most vibration sources in daily life changes over time. Therefore, fixed-stiffness vibration energy recovery devices cannot effectively recover the vibration energy of such variable-frequency vibration sources and have poor adaptability. Summary of the Invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the first embodiment of the present disclosure provides a vibration energy recovery device capable of implementing a working frequency band adjustment function, including:

[0005] An energy harvesting mechanism for harvesting vibration energy from a vibration source and converting the vibration energy into AC electrical energy, wherein the energy harvesting mechanism includes a spacing-adjustable component;

[0006] an operating frequency band adjustment mechanism for adjusting the relative spacing of the components within the adjustable spacing assembly, thereby adjusting the operating frequency band of the energy harvesting mechanism; and

[0007] The energy processing module is used to convert the AC power collected by the energy collection mechanism into DC power and output it to the load.

[0008] The vibration energy recovery device provided by the first embodiment of the present disclosure has the following features and beneficial effects:

[0009] The vibration energy recovery device provided in the embodiment of the first aspect of the present disclosure changes the relative spacing of the components in the adjustable spacing assembly and changes the operating frequency band of the energy collection mechanism. It can adjust the operating frequency band of the device according to the vibration frequency band of the vibration source to perform targeted vibration energy recovery. Compared with other vibration energy recovery devices whose operating frequency bands cannot be changed, it has stronger applicability.

[0010] In some embodiments, the equivalent stiffness of the adjustable spacing component varies with the vibration of the vibration source.

[0011] In some embodiments, the energy harvesting mechanism includes a shell connected to the vibration source, a coil wound around the outer wall of the shell, and the adjustable spacing component located inside the shell, wherein the adjustable spacing component includes a permanent magnet, a piezoelectric sheet, and a spring connected between the permanent magnet and the piezoelectric sheet.

[0012] In some embodiments, the spring is a variable rate spring.

[0013] In some embodiments, the housing is made of insulating material.

[0014] In some embodiments, at least one group of the adjustable spacing components is provided in the housing; in each group of the adjustable spacing components, one permanent magnet is provided, and at least one piezoelectric piece is provided only on one side of the permanent magnet, or at least one piezoelectric piece is provided on both sides of the permanent magnet, respectively, and one spring is connected between the permanent magnet and each piezoelectric piece, and all the springs in each group of the adjustable spacing components constitute variable stiffness springs.

[0015] In some embodiments, the working frequency band adjustment mechanism includes at least one bolt, one end of the bolt passes through one end of the shell and is connected to the piezoelectric piece, and the other end of the bolt is located outside the shell. The relative spacing of the components in the adjustable spacing assembly is adjusted by screwing the bolt in or out.

[0016] In other embodiments, one end of the outer cover is an open end, and the working frequency band adjustment mechanism includes an end cover that is threadedly engaged with one end of the outer shell, and the end cover is in contact with the piezoelectric piece. The relative spacing of the components in the adjustable spacing assembly is adjusted by screwing in or out the end cover.

[0017] The vibration source provided in the embodiment of the second aspect of the present disclosure, the vehicle includes the vibration energy recovery device provided in any embodiment of the first aspect of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An external three-dimensional view of Example 1 of the vibration energy recovery device provided as an embodiment of the first aspect of the present disclosure.

[0019] Figure 2 for Figure 1 Anatomical 3D view of the vibration energy recovery device shown.

[0020] Figure 3 for Figure 1 A cross-sectional view of the vibration energy recovery device shown.

[0021] Figure 4 An external three-dimensional view of Example 2 of the vibration energy recovery device provided in accordance with the first aspect of the present disclosure.

[0022] Figure 5 for Figure 4 A cross-sectional view of the vibration energy recovery device shown.

[0023] In the picture:

[0024] 10—variable stiffness energy harvesting mechanism, 11—housing, 12—coil, 13—spacing-adjustable component, 131—permanent magnet, 132—piezoelectric piece, 133—variable stiffness spring;

[0025] 20—working frequency band adjustment mechanism, 21—bolt, 22—end cover;

[0026] 30—Energy processing module. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0028] On the contrary, this application covers any alternatives, modifications, equivalents, and solutions made within the spirit and scope of this application as defined by the claims. Furthermore, to facilitate a better understanding of this application, certain specific details are described in detail below in the detailed description of this application. Those skilled in the art will be able to fully understand this application without these details.

[0029] The vibration energy recovery device provided by the first embodiment of the present disclosure includes:

[0030] An energy harvesting mechanism, configured to harvest vibration energy generated by a vibration source and convert the vibration energy into AC electrical energy, the energy harvesting mechanism comprising a spacing-adjustable component;

[0031] An operating frequency band adjustment mechanism for adjusting the relative spacing between components within the adjustable spacing assembly within the energy harvesting mechanism, thereby adjusting the operating frequency band of the energy harvesting mechanism; and

[0032] The energy processing module is used to convert the AC power collected by the energy collection mechanism into DC power and then output it to the load.

[0033] Furthermore, the equivalent stiffness of the adjustable spacing component changes with the vibration of the vibration source.

[0034] The following describes Example 1 of a vibration energy recovery device provided by an embodiment of the first aspect of the present disclosure:

[0035] See also Figures 1 to 3 The vibration energy recovery device of this embodiment 1 includes:

[0036] The energy harvesting mechanism 10 includes a housing 11 connected to a vibration source, a coil 12 wound around the outer wall of the housing 11, and an adjustable spacing assembly 13 located within the housing 11. The adjustable spacing assembly 13 includes a permanent magnet 131, a piezoelectric plate 132, and a variable stiffness spring 133 connected between the permanent magnet 131 and the piezoelectric plate 132. The permanent magnet 131 vibrates within the housing 11 in response to the vibration source, generating an electromotive force in the coil 12 and a piezoelectric voltage in the piezoelectric plate 132. Simultaneously, because the elastic force of the variable stiffness spring 133 varies with the position of the permanent magnet 131, the permanent magnet 131 is subjected to the variable elastic force of the variable stiffness spring 133, enabling resonance of the adjustable spacing assembly 13 at multiple excitation frequencies, thereby achieving broadband energy harvesting.

[0037] The operating frequency band adjustment mechanism 20 includes at least one bolt 21. One end of the bolt 21 passes through one end of the housing 11 and is connected to the piezoelectric piece 132. The other end of the bolt 21 is located outside the housing 11. By screwing the bolt 21 in or out, the relative spacing between the components of the adjustable spacing assembly 13 (in this embodiment, the relative spacing refers to the vertical spacing) is adjusted to change the preload of the variable stiffness spring 133, thereby changing the resonant frequency position and bandwidth of the adjustable spacing assembly 13, thereby adjusting the operating frequency band of the energy harvesting mechanism 10; and

[0038] The energy processing module 30 is mounted on the housing 11 and includes a rectifier circuit. The rectifier circuit rectifies the motional electromotive force generated in the coil 12 and the piezoelectric voltage generated by the piezoelectric sheet 132 into a DC voltage and outputs it to supply power to the load.

[0039] In some embodiments, the housing 11 is a cylindrical shell made of insulating materials such as acrylic or PVC.

[0040] In some embodiments, at least one set of adjustable spacing components 13 is provided in the housing 11. When multiple sets of adjustable spacing components are provided, the distance between two adjacent adjustable spacing components should be greater than the diameter of the piezoelectric piece and there should be no significant mutual interference. In each set of adjustable spacing components 13, there is a permanent magnet 131. The height and diameter of the permanent magnet 131 need to match the size of the housing 11 and the variable stiffness spring 133, that is, the total height of the permanent magnet 131 and the variable stiffness spring 133 should be less than the height of the housing 11, and the diameter of the permanent magnet 131 should be between 1 and 2 times the diameter of the contact surface between the variable stiffness spring 133 and the permanent magnet 131 to meet the structural strength requirements of the device. The piezoelectric piece 132 can be made of a material having a piezoelectric effect, such as barium titanate or PZT. The number and size of the piezoelectric pieces 132 are determined according to the bottom area and shape of the housing 11. One or more piezoelectric pieces 131 can be provided on one side of the permanent magnet 131. 2. One or more piezoelectric sheets 132 may also be provided on both sides of the permanent magnet 131. When the piezoelectric sheets 132 are provided on both sides of the permanent magnet, the piezoelectric sheet 132 on one side of the permanent magnet 131 is fixedly connected to one end of the housing 11, and the piezoelectric sheet 132 on the other side of the permanent magnet 131 is suspended in the housing 11, and the piezoelectric sheet 132 on the other side is fixedly connected to the end of the bolt 21 located inside the housing 11. A spring is connected between the permanent magnet 131 and each piezoelectric sheet 132. The spring provided between one side of the permanent magnet 131 and the piezoelectric sheet 132 may be a constant stiffness spring and / or a variable stiffness spring, ensuring that all springs in each group of adjustable spacing components 13 constitute variable stiffness springs. Corresponding to a frequency range, during the vibration of the permanent magnet 131, the equivalent stiffness of the adjustable spacing component 13 continuously changes, enabling the energy harvesting mechanism 10 to harvest energy within a larger frequency range. In addition, through the composite vibration energy recovery of piezoelectric and electromagnetic methods, the energy recovery efficiency is improved.

[0041] Furthermore, in each set of adjustable spacing components, each component is coaxially arranged in the initial state (for the case where multiple piezoelectric sheets and / or multiple springs are arranged on the side of the permanent magnet, the multiple piezoelectric sheets and / or multiple springs are evenly arranged on the corresponding sides of the permanent magnet), which can increase the stability of the working frequency band adjustment mechanism 20 and ensure its service life.

[0042] In some embodiments, a bolt 21 or a plurality of evenly distributed bolts 21 are disposed between one end of the housing 11 and one piezoelectric piece 131 .

[0043] The operating process of Example 1 is as follows: the housing 11 is fixedly connected to a vibration source (such as a vehicle body). The vibration of the vibration source causes the entire device of this embodiment to vibrate. The permanent magnet 131 vibrates under the action of the variable-stiffness spring 133, generating an electromotive force on the coil 12. Simultaneously, the piezoelectric plate 132 generates a piezoelectric voltage. These two AC voltages are input via wires into the rectifier circuit of the energy processing module 30, where they are rectified and converted into a DC voltage for output. During the vibration process, because the elastic force of the variable-stiffness spring 133 changes with the position of the permanent magnet 131, the permanent magnet 131 is optimally subjected to the varying elastic force, achieving resonance at multiple excitation frequencies, thereby achieving broadband energy harvesting. By rotating the bolt 21, the spacing between the piezoelectric plate 132 and the permanent magnet 131 is changed, thereby varying the preload of the variable-stiffness spring 133, changing the resonant frequency point and the bandwidth, and thus adjusting the operating frequency band of the energy harvesting mechanism 10.

[0044] The following describes Example 2 of the vibration energy recovery device provided by the first embodiment of the present disclosure:

[0045] See also Figure 4 、 Figure 5 The difference between the vibration energy recovery device of this embodiment 2 and the vibration energy recovery device of embodiment 1 is that the implementation method of the working frequency band adjustment mechanism 20 is different. Specifically, the working frequency band adjustment mechanism 20 of this embodiment 2 adopts an end cap 22 with an external thread, and an internal thread matching the external thread is provided on the inner side wall of one end of the shell 11. The end cap 22 is in contact with the piezoelectric piece 132 on one side of the permanent magnet 131, and the distance between the piezoelectric piece 132 on one side of the permanent magnet 131 and the permanent magnet 131 is changed by screwing in or out the end cap 22. The rest of this embodiment is the same as that of embodiment 1 and will not be repeated here.

[0046] The vibration source provided in the second aspect embodiment of the present disclosure has the vibration energy recovery device provided in the first aspect embodiment of the present disclosure, and the outer shell of the vibration energy recovery device is fixed to the vibration source, so as to realize the collection of vibration energy during the vibration process of the vibration source, and convert the vibration energy into stable electrical energy output for use by the load.

[0047] The vibration source may be a vehicle, mechanical equipment, a bridge, a building structure, or other vibrating structures.

[0048] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0049] Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A vibration energy recovery device, characterized in that: include: An energy harvesting mechanism for harvesting vibration energy from a vibration source and converting the vibration energy into AC electrical energy, wherein the energy harvesting mechanism includes a spacing-adjustable component; An operating frequency band adjustment mechanism, used to adjust the relative spacing of the components in the adjustable spacing assembly, thereby adjusting the operating frequency band of the energy harvesting mechanism; and An energy processing module, configured to convert the AC power collected by the energy collection mechanism into DC power and output the DC power to a load; The energy harvesting mechanism includes a housing connected to the vibration source, a coil wound around an outer wall of the housing, and the adjustable spacing component located within the housing, wherein the adjustable spacing component includes a permanent magnet, a piezoelectric sheet, and a spring connected between the permanent magnet and the piezoelectric sheet; The working frequency band adjustment mechanism includes at least one bolt, one end of the bolt passes through one end of the shell and is connected to the piezoelectric piece, and the other end of the bolt is located outside the shell. The relative spacing of the components in the adjustable spacing assembly is adjusted by screwing the bolt in or out.

2. The vibration energy recovery device according to claim 1, characterized in that: The equivalent stiffness of the adjustable spacing component varies with the vibration of the vibration source.

3. The vibration energy recovery device according to claim 1, characterized in that: The spring is a variable stiffness spring.

4. The vibration energy recovery device according to claim 1, characterized in that: The shell is made of insulating material.

5. The vibration energy recovery device according to claim 1, characterized in that: At least one group of the adjustable-distance components is provided in the housing; in each group of the adjustable-distance components, one permanent magnet is provided, and at least one piezoelectric sheet is provided only on one side of the permanent magnet, or at least one piezoelectric sheet is provided on both sides of the permanent magnet, respectively; one spring is connected between the permanent magnet and each piezoelectric sheet, and all the springs in each group of the adjustable-distance components constitute variable-stiffness springs.

6. The vibration energy recovery device according to claim 1, characterized in that: One end of the shell is an open end, and the working frequency band adjustment mechanism includes an end cover that is threadedly engaged with one end of the shell. The end cover is in contact with the piezoelectric sheet, and the relative spacing of the components in the adjustable spacing assembly is adjusted by screwing in or out the end cover.

7. A vibration source, characterized in that: It comprises the vibration energy recovery device according to any one of claims 1 to 6.

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