CN210380695U - Ultralow-frequency vibration energy harvesting device based on bow-shaped piezoelectric spring structure - Google Patents
Ultralow-frequency vibration energy harvesting device based on bow-shaped piezoelectric spring structure Download PDFInfo
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- CN210380695U CN210380695U CN201921839743.2U CN201921839743U CN210380695U CN 210380695 U CN210380695 U CN 210380695U CN 201921839743 U CN201921839743 U CN 201921839743U CN 210380695 U CN210380695 U CN 210380695U
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Abstract
The utility model discloses an ultralow frequency vibration energy harvesting device based on bow type piezoelectric spring structure, including closed shell, two fixed bases, slip quality piece, guide rail and two bow type piezoelectric spring structures, its characterized in that links to each other two bow type piezoelectric spring's one end with the both sides of slip quality piece respectively, and the other end links to each other and makes and is in tensile state with the base respectively, links to each other with closed shell through fixed base. The bow-shaped piezoelectric spring structure is composed of a nylon nut, a nylon stud and at least two piezoelectric patches, the sliding mass block comprises a rectangular fixing frame, a perforated metal ball and an optical axis, the optical axis penetrates through the perforated metal ball and fixes the perforated metal ball in the rectangular fixing frame, a guide rail is arranged below the perforated metal ball, and the sliding mass block enables the piezoelectric patches to output electric energy by stretching and restoring the bow-shaped piezoelectric spring structure. The device can convert external ultralow frequency vibration energy into electric energy through a piezoelectric effect, and is suitable for collecting water surface wave energy of rivers, lakes, seas and the like.
Description
Technical Field
The utility model belongs to the technical field of the vibration energy is caught, concretely relates to ultralow frequency vibration energy harvesting device based on bow type piezoelectric spring structure.
Background
With the wide application of wireless sensor networks in real life, the power consumption of the wireless sensor networks is lower and lower. The wireless sensor network node can provide energy for the wireless sensor network node by utilizing energy in the environment, and the energy which can be utilized in the environment at present comprises light energy, heat energy, vibration energy and the like, wherein the vibration energy is widely existed in the living environment of people, such as the motion of human bodies, the vibration of vehicles, the fluctuation of water and the like. To this end, researchers have begun studying techniques for harvesting and converting vibrational energy in an environment into electrical energy to provide electrical energy to wireless sensor network nodes.
Currently, the most studied environmental vibration energy collection methods include electromagnetic type and piezoelectric type, and among them, piezoelectric type transducers are favored because of their advantages such as simple structure, no electromagnetic interference, and few moving parts. However, most of the vibration energy collecting systems designed for low frequency are constructed by cantilever beams or springs and mass blocks. In either configuration, the resonant frequency of the spring-mass system is difficult to effectively reduce. The reason for this is that the cantilever beam structure itself cannot be deformed greatly, so the stiffness of the cantilever beam cannot be too small, the mass of the end mass block cannot be too large, otherwise the cantilever beam may be broken or plastically deformed. However, a vibration system with a very low resonant frequency, which is composed of a spring and a mass block, generally faces the problems of an oversized system and an overlong stroke of the mass block. Many researchers have proposed ways to lower the natural frequency of the transducer. Such as the patent: 201210210358.8, there is provided an upconversion vibration energy harvesting device adapted for low frequency vibration energy harvesting, comprising: the system comprises a frame, a torsional spring, a hinge, an articulated arm, a piezoelectric sheet rack, a piezoelectric sheet, a mass block and an elastic structure, wherein the articulated arm and the torsional spring which are regarded as rigid bodies in the moving and collision processes are assembled into a spring-mass second-order system which can convert the energy of low-frequency vibration outside the system into mechanical energy contained between mechanisms inside the system and has low resonant frequency, and then the energy of low-frequency vibration is converted into the energy of high-frequency vibration by using the collision of the hinge arm and the elastic structure, so that the up-conversion is realized; and then the energy of the high-frequency vibration is converted into electric energy through the piezoelectric plate. As another patent: 201810738575.1, a piezoelectric spring structure for ultra low frequency vibration energy conversion is proposed, comprising: the connecting rod and at least 1 piezoelectricity metal clip constitute piezoelectric spring: the piezoelectric metal clip is composed of a metal clip and a piezoelectric ceramic material covering the surface of the metal clip, wherein the metal clip is U-shaped, and at least one surface of the piezoelectric metal clip is covered with the piezoelectric ceramic material. The device is suitable for converting ultralow frequency vibration energy into electric energy and storing the electric energy. Although the above-described device reduces the resonant frequency of the energy harvester to a degree, it does not achieve an efficient harvesting of energy. It can be seen that vibration energy harvesters for low frequency vibrations are not yet mature, and therefore, there is a need in practice for a new vibration energy system that addresses the above-mentioned problems.
The utility model discloses an ultralow frequency vibration energy harvesting device based on bow type piezoelectric spring structure, including closed shell, two fixed bases, slip quality piece, guide rail and two bow type piezoelectric spring structures, its characterized in that links to each other two bow type piezoelectric spring's one end with the both sides of slip quality piece respectively, and the other end links to each other and makes and is in tensile state with the base respectively, links to each other with closed shell through fixed base. The bow-shaped piezoelectric spring structure is composed of a nylon nut, a nylon stud and at least two piezoelectric patches, the sliding mass block comprises a rectangular fixing frame, a perforated metal ball and an optical axis, the optical axis penetrates through the perforated metal ball and is fixed in the rectangular fixing frame, a guide rail is arranged below the perforated metal ball, and the sliding mass block enables the piezoelectric patches to output electric energy by stretching and restoring the bow-shaped piezoelectric spring structure. The device can convert external ultralow frequency vibration energy into electric energy through a piezoelectric effect, and is suitable for collecting water surface wave energy of rivers, lakes, seas and the like.
Disclosure of Invention
The utility model aims at: the ultralow-frequency vibration energy harvesting device based on the bow-shaped piezoelectric spring structure is provided, the response frequency of the device is reduced through the characteristic that the metal ball type sliding mass block is high in sensitivity, and the piezoelectric energy harvesting efficiency is improved by utilizing the spring structure formed by connecting a plurality of piezoelectric plates.
For realizing the utility model discloses, the technical scheme of adoption is: the ultralow frequency vibration energy harvesting device based on the bow-shaped piezoelectric spring structure comprises a closed shell, two fixed bases, a sliding mass block, a guide rail and two bow-shaped piezoelectric spring structures, and is characterized in that one ends of the two bow-shaped piezoelectric springs are respectively connected with two sides of the sliding mass block, the other ends of the two bow-shaped piezoelectric springs are respectively connected with the bases to enable the bases to be in a stretching state, and the two bow-shaped piezoelectric springs are connected with the closed shell through the fixed bases. The bow-shaped piezoelectric spring structure is composed of a nylon nut, a nylon stud and at least two piezoelectric patches, the sliding mass block comprises a rectangular fixing frame, a perforated metal ball and an optical axis, the optical axis penetrates through the perforated metal ball and is fixed in the rectangular fixing frame, a guide rail is arranged below the perforated metal ball, the sliding mass block enables the piezoelectric patches to output electric energy by stretching and restoring the bow-shaped piezoelectric spring structure, the positive electrode and the negative electrode of each piezoelectric patch are led out by a lead, and then the piezoelectric patches are respectively connected with an acquisition interface circuit and overlapped, so that the efficient collection of vibration energy under ultra-low frequency is realized. The device can convert external ultralow frequency vibration energy into electric energy through a piezoelectric effect, and is suitable for collecting water surface wave energy of rivers, lakes, seas and the like.
The invention has the beneficial effects that:
1. the bow-shaped spring type structure is formed by connecting the multiple piezoelectric sheets, and the natural frequency of the energy harvester can be changed by changing the number of the piezoelectric sheets or the connection mode of the piezoelectric sheets.
2. The metal ball is used as the sliding mass block, the friction force is extremely small, the sensitivity is high, and the resonant frequency of the energy harvester is reduced, so that the vibration energy collection under the ultralow frequency is realized.
3. The spring type structure is formed by adopting a plurality of piezoelectric plates, and the piezoelectric plates are deformed successively, so that the effective energy harvesting bandwidth can be widened, more vibration energy can be collected, and the output power can be improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the closure housing of the present invention;
FIG. 3 is a schematic view of the internal structure of the present invention;
fig. 4 is a schematic structural view of the bow-shaped piezoelectric spring of the present invention;
fig. 5 is a schematic structural view of the sliding mass block of the present invention;
wherein: 1: a closed housing; 2: a fixed base; 3: a sliding mass block; 4: a guide rail; 5: a bow-shaped piezoelectric spring structure; 6: a nylon nut; 7: a nylon stud; 8: a piezoelectric sheet; 9: a rectangular fixed frame; 10: a metal ball with a hole; 11: an optical axis.
Detailed Description
An ultralow-frequency vibration energy harvesting device based on a bow-shaped piezoelectric spring structure comprises a closed shell (1), two fixed bases (2), a sliding mass block (3), a guide rail (4) and two bow-shaped piezoelectric spring structures (5), and is characterized in that one ends of the two bow-shaped piezoelectric spring structures (5) are respectively connected with two sides of the sliding mass block (3), the other ends of the two bow-shaped piezoelectric spring structures are respectively connected with the two fixed bases (2) and are in a stretching state, the two bow-shaped piezoelectric spring structures are connected with the closed shell (1) through the two fixed bases (2), as shown in figure 3, each bow-shaped piezoelectric spring structure (5) comprises a nylon nut (6), a nylon stud (7) and at least two piezoelectric sheets (8), as shown in figure 4, each sliding mass block (3) comprises a rectangular fixed frame (9), a perforated metal ball (10) and an optical axis (11), and the optical axis (11) penetrates through the perforated metal ball (10) and is fixed in the rectangular fixed frame (9), as shown in fig. 5, the guide rail (4) is arranged on the closed shell (1) below the metal ball (10) with the hole, and the piezoelectric spring structure (5) is stretched and extruded by the sliding mass block (3) under the excitation of environmental vibration, so that the piezoelectric sheet (8) outputs electric energy. The device can convert external ultralow frequency vibration energy into electric energy through a piezoelectric effect, and is suitable for collecting water surface wave energy of rivers, lakes, seas and the like.
The working principle is as follows: the device utilizes nylon nut (6), nylon double-screw bolt (7) to connect a plurality of piezoelectric patches (8) into two bow-shaped piezoelectric spring structures (5), because the frictional force that foraminiferous metal ball (10) received is minimum, and sensitivity is high, when taking place the vibration, foraminiferous metal ball (10) are followed guide rail (4) direction motion, stretch respectively and extrude both sides bow-shaped piezoelectric spring structure (5), lead to piezoelectric patches (8) to take place deformation in proper order, realized the expansion of device vibration frequency response bandwidth, draw forth the positive negative pole of each piezoelectric patch (8) with the wire, connect respectively after that and gather interface circuit, stack to realize the high-efficient collection of vibration energy under the ultralow frequency.
Preferably, a plurality of piezoelectric patches (8) can be connected into a bow-shaped piezoelectric spring structure (5) by adopting nylon screw caps (6) and nylon studs (7), when vibration is generated, the sliding mass block (3) slides along the direction of the guide rail (4) and respectively stretches or extrudes the two bow-shaped piezoelectric spring structures (5), so that the piezoelectric patches (8) are deformed, the number of the piezoelectric patches (8) is more, and the deformation range is larger.
Preferably, the perforated metal ball (10) is used as a counterweight and a rolling mechanism of the sliding mass block (3), can be made of stainless steel materials, can also be made of perforated metal balls made of other materials, can be of a spherical structure, can also be of a roller structure, can reduce friction force and ensure sensitivity, and the larger the mass, the lower the response vibration frequency.
Preferably, the optical axis (11) passes through the perforated metal ball (10) as an axis and is connected to the rectangular fixing frame (9), and stainless steel or other materials can be adopted.
Preferably, the bow-shaped piezoelectric spring structure (5) can be fixed on the fixed base (2) or directly fixed on the side wall of the closed shell (1).
Preferably, in order to eliminate voltage phase interference generated among different piezoelectric plates (8) and reduce voltage loss, the multiple piezoelectric plates (8) are connected by nylon screw caps (6) and nylon screw studs (7) or by screw studs and screw caps made of other insulating materials.
Preferably, in order to ensure that the sliding mass block (3) slides linearly, the arranged guide rail (4) is arranged on the bottom plate of the closed shell (1), and a groove can be directly arranged on the bottom plate of the closed shell (1) to ensure that the sliding mass block (3) slides linearly.
It should be noted that the above technical features are continuously combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; moreover, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. An ultralow-frequency vibration energy harvesting device based on a bow-shaped piezoelectric spring structure comprises a closed shell (1), two fixed bases (2), a sliding mass block (3), a guide rail (4) and two bow-shaped piezoelectric spring structures (5), and is characterized in that one ends of the two bow-shaped piezoelectric spring structures (5) are respectively connected with two sides of the sliding mass block (3), the other ends of the two bow-shaped piezoelectric spring structures are respectively connected with the two fixed bases (2) and are in a stretching state, the two bow-shaped piezoelectric spring structures are connected with the closed shell (1) through the two fixed bases (2), each bow-shaped piezoelectric spring structure (5) comprises a nylon nut (6), a nylon stud (7) and at least two piezoelectric sheets (8), each sliding mass block (3) comprises a rectangular fixed frame (9), a perforated metal ball (10) and an optical axis (11), and the optical axis (11) penetrates through the perforated metal ball (10) and is fixed in the rectangular fixed frame (9), the guide rail (4) is arranged on the closed shell (1) below the metal ball (10) with the hole, the bow-shaped piezoelectric spring structure (5) is stretched and extruded through the sliding mass block (3) under the excitation of environmental vibration, so that the piezoelectric sheet (8) outputs electric energy, and the device can convert external ultralow-frequency vibration into electric energy through the piezoelectric effect, and is suitable for collecting water surface wave energy of rivers, lakes, sea and the like.
2. The ultralow-frequency vibration energy harvesting device based on the bow-shaped piezoelectric spring structure is characterized in that a plurality of piezoelectric sheets (8) can be connected into the bow-shaped piezoelectric spring structure (5) through nylon nuts (6) and nylon studs (7), when vibration is generated, the sliding mass block (3) slides along the direction of the guide rail (4) and respectively stretches or extrudes the two bow-shaped piezoelectric spring structures (5), so that the piezoelectric sheets (8) are deformed, and the larger the number of the piezoelectric sheets (8) is, the larger the deformation range is.
3. The ultralow frequency vibration energy harvesting device based on the bow-shaped piezoelectric spring structure is characterized in that the metal balls (10) with holes are used as a counterweight and a rolling mechanism of the sliding mass block (3), can be made of stainless steel materials, can be made of other materials, can be made of spherical structures, can be made of roller structures, can reduce friction force and ensure sensitivity, and the larger the mass, the lower the response vibration frequency.
4. The ultralow frequency vibration energy harvesting device based on the bow-shaped piezoelectric spring structure is characterized in that an optical axis (11) is used as an axis to penetrate through a metal ball (10) with a hole and is connected to a rectangular fixing frame (9), and the optical axis (11) can be made of stainless steel or other materials.
5. The ultralow frequency vibration energy harvesting device based on the bow-shaped piezoelectric spring structure is characterized in that the bow-shaped piezoelectric spring structure (5) can be fixed on a fixed base (2) or directly fixed on the side wall of a closed shell (1).
6. The ultralow frequency vibration energy harvesting device based on the bow-shaped piezoelectric spring structure is characterized in that in order to eliminate voltage phase interference generated among different piezoelectric sheets (8) and reduce voltage loss, nylon nuts (6) and nylon studs (7) are adopted for connecting the piezoelectric sheets (8), and studs and nuts made of other insulating materials can also be adopted for connecting.
7. The ultralow frequency vibration energy harvesting device based on the bow-shaped piezoelectric spring structure is characterized in that guide rails (4) are arranged on a bottom plate of the closed shell (1) for ensuring the linear sliding of the sliding mass block (3), and grooves can be directly arranged on the bottom plate of the closed shell (1) for ensuring the linear sliding of the sliding mass block (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921839743.2U CN210380695U (en) | 2019-10-30 | 2019-10-30 | Ultralow-frequency vibration energy harvesting device based on bow-shaped piezoelectric spring structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921839743.2U CN210380695U (en) | 2019-10-30 | 2019-10-30 | Ultralow-frequency vibration energy harvesting device based on bow-shaped piezoelectric spring structure |
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| CN201921839743.2U Expired - Fee Related CN210380695U (en) | 2019-10-30 | 2019-10-30 | Ultralow-frequency vibration energy harvesting device based on bow-shaped piezoelectric spring structure |
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Granted publication date: 20200421 |