CN211151849U - Piezoelectric energy collector and mechanical equipment with same - Google Patents
Piezoelectric energy collector and mechanical equipment with same Download PDFInfo
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- CN211151849U CN211151849U CN202020017294.XU CN202020017294U CN211151849U CN 211151849 U CN211151849 U CN 211151849U CN 202020017294 U CN202020017294 U CN 202020017294U CN 211151849 U CN211151849 U CN 211151849U
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Abstract
The utility model provides a mechanical equipment and piezoelectric type energy collector thereof, wherein piezoelectric type energy collector is including being used for collecting the piezoelectric wafer of vibrational energy, can producing the cantilever beam that has damped vibration to and actuating mechanism, the piezoelectric wafer sets up on the cantilever beam, actuating mechanism is used for being connected to rotary mechanism's output shaft is last and rotationally acts on the cantilever beam makes it produce the vibration. The cantilever beam provided with the piezoelectric wafer is periodically shifted by adopting the driving mechanism, so that the energy collector is prevented from being influenced by the rotating speed of the rotating mechanism, the use requirements in a high-speed, uniform and wider rotating speed range are met, and the piezoelectric energy conversion efficiency can be improved.
Description
Technical Field
The utility model relates to an energy harvesting technology field especially relates to a piezoelectric type energy collector and have its mechanical equipment.
Background
Energy harvesting technology is a technology that converts energy that cannot be directly used in the surrounding environment into energy that can be utilized in a specific manner. The utilization mode is mainly used for providing electric energy for small devices. Compared with the traditional battery power supply, the energy collection technology has the following advantages for the power supply of the micro-electromechanical system: the structure is simple, and the occupied volume is small; the service life is long, and toxic or dangerous substances are hardly contained; can stably supply power for a long time without disassembly and replacement. Therefore, the development of energy harvesting technology is of great significance to the development of new energy.
Of the many forms of energy present in the ambient environment, vibrational energy is the most common one, and there is a high energy density. The piezoelectric material has many advantages for collecting vibration energy, such as simple structure, no heat generation, no electromagnetic interference, cleanness, environmental protection and the like.
In the piezoelectric power generation model of the cantilever structure, external vibration is applied to the piezoelectric vibrator to generate a piezoelectric effect, thereby generating an electromotive force on the surface of the piezoelectric vibrator. Compared with other forms of energy collectors, the energy collector with the simple structure is easier to miniaturize and integrate, and therefore has great research value.
However, such energy collectors also present certain problems. For example, such energy harvesters cannot fully utilize the vibrations of various frequencies present in the surrounding environment because they can only harvest higher power electrical energy at a specific frequency of vibration (the natural frequency of the energy harvester), and if the frequency deviates from this frequency, the device's ability to harvest energy is greatly reduced.
SUMMERY OF THE UTILITY MODEL
The primary object of the present invention is to provide a piezoelectric energy collector with wide frequency response.
Another object of the present invention is to provide a mechanical device using the piezoelectric energy collector.
In order to achieve the above object, the present invention provides the following technical solutions:
the piezoelectric energy collector comprises a piezoelectric wafer for collecting vibration energy, a cantilever beam capable of generating damped vibration and a driving mechanism, wherein the piezoelectric wafer is arranged on the cantilever beam, and the driving mechanism is connected to an output shaft of the rotating mechanism and can rotationally act on the cantilever beam to enable the cantilever beam to generate vibration.
Preferably, the driving mechanism comprises an inner gear ring, a sun gear, a planet gear and a toggle beam; the planetary gear is meshed with the sun gear and the inner gear ring, and the poking beam is fixed on the rotating shaft of the planetary gear and can poke the cantilever beam periodically when the planetary gear rotates along with the sun gear.
Furthermore, the planetary gear set further comprises a planetary carrier used for limiting the planetary gears to move along the axial direction of the rotating shaft.
Preferably, the planet carrier abuts against and enables the end faces of the planet wheels and the sun wheel on the same side to be flush, and the cantilever beam and the toggle beam are located on one side, far away from the corresponding gear, of the planet carrier.
Preferably, the pivot of sun gear and planet wheel all is equipped with the installation department, set up the screw hole that is used for installing the cantilever beam or stirring the roof beam on the installation department, the cantilever beam or stir the roof beam with the help of the fix with screw in the installation department of pivot.
Preferably, the pivot is the setting of multistage step, includes gear installation section, planet carrier installation section and the roof beam installation section that sets gradually along the axial, the keyway has been seted up in the gear installation section in order with the help of key and sun gear or planet wheel rigid coupling, the diameter of planet carrier installation section is less than gear installation section is used for the installation the planet carrier, the installation department is located roof beam installation section.
Preferably, the rotational axis of the planet wheel is shorter than the rotational axis of the sun wheel.
Preferably, the mounting portion is provided to the beam mounting section in a planar manner, and a width of the plane is equal to a diameter of the rotation shaft.
Preferably, the sum of the lengths of the poking beam and the cantilever beam is larger than the sum of the radiuses of the planet wheel and the sun wheel, and the poking beam can be partially overlapped with the cantilever beam in a rotating mode, so that the cantilever beam is poked to vibrate.
As a second aspect, the utility model discloses still relate to a mechanical equipment, including rotary mechanism, the sensing device who is used for detecting the rotary mechanism performance, and do the power module of sensing device power supply, power module includes piezoelectric type energy collector, wherein, actuating mechanism and rotary mechanism's output shaft is connected and acts on along with the output shaft synchronous rotation the cantilever beam.
Compared with the prior art, the utility model discloses a scheme has following advantage:
in the piezoelectric energy collector of the utility model, the method of using the planetary gear train to stir the cantilever beam with the piezoelectric wafer has the advantages that the energy conversion efficiency is mainly related to the relative rotation of the sun wheel and the planet wheel, is not influenced by the rotation speed of the sun wheel, can improve the piezoelectric energy conversion efficiency in a high-speed, uniform and wide rotation speed range, and has a broadband effect; in addition, the integrated structure can be conveniently installed on the rotating machinery, and has higher practical application value.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a perspective view of a piezoelectric energy collector according to an embodiment of the present invention;
fig. 2 is a perspective view of a rotating shaft according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 1 and 2, the utility model provides a piezoelectric type energy collector 100 adopts cantilever beam 1 to add actuating mechanism's structure, and wherein cantilever beam 1 has elasticity to make its free end can produce the vibration of damping when being touched and pressed, the free end of cantilever beam can be stirred periodically to the actuating structure, and the piezoelectric wafer sets up on cantilever beam 1, and can collect the produced energy when cantilever beam 1 free end vibrates, and then can supply power for outside sensing device.
In one embodiment, the driving mechanism comprises an inner gear ring 5, a sun gear 3, a planet gear 4 and a stirring beam 2, the inner gear ring 5 is provided with a plurality of gear teeth around the inner circumference of the inner gear ring 5, the sun gear 3 and the planet gear 4 are both arranged in the inner gear ring 5, the sun gear 3 is connected to an external rotating mechanism through a rotating shaft 7 of the sun gear 3, and the planet gear 4 is meshed with the sun gear 3 and the inner gear ring 5.
Specifically, one end of the cantilever beam 1 provided with the piezoelectric wafer is fixed on the rotating shaft 7 of the sun gear 3, and the other end is suspended, so that resonance can be generated when the cantilever beam is subjected to external force. The poking beam 2 is fixed on a rotating shaft 7 of the planet wheel 4 and rotationally pokes the free end of the cantilever beam 1 to vibrate. Because the planet wheel 4 is meshed with the inner gear ring 5 and the sun wheel 3, the planet wheel also revolves around the sun wheel 3 during rotation, so that the cantilever beam 1 can be periodically stirred by the stirring beam 2 during revolution of the planet wheel 4, and the cantilever beam 1 can freely vibrate with damping at the inherent frequency after being stirred and released, so that resonance of the cantilever beam 1 is realized, and electric energy is continuously generated. The shifting time interval is related to the transmission ratio of the planetary gear 4 system and the rotating speed of the sun gear 3, and can be set by technicians according to requirements. In the present embodiment, the cantilever beam 1 and the toggle beam 2 are both in the shape of a sheet. The inner gear ring 5 is fixed with an external structure, and the rotating shaft 7 of the sun gear 3 is also fixed on an output shaft of the rotating mechanism to rotate synchronously therewith.
Preferably, the sum of the lengths of the cantilever beam 1 and the toggle beam 2 is greater than the sum of the radiuses of the planet wheel 4 and the sun wheel 3, and the toggle beam 2 is partially overlapped with the cantilever beam 1 when rotating by a preset angle, so that the free end of the cantilever beam 1 can be pressed when the toggle beam 2 continues to rotate, and the cantilever beam 1 can vibrate freely after the pressing is released. Preferably, the overlap is 1-2mm in length.
Preferably, in order to ensure that the dial beam 2 can sufficiently act on the cantilever beam 1, the dial beam 2 and the cantilever beam 1 are installed at the same height (or approximately the same height) of the rotating shaft 7 of the corresponding gear, and the dial beam 2 and the cantilever beam 1 are approximately located on the same plane when contacting with each other as much as possible.
Preferably, sun gear 3 and planet wheel 4 are respective be equipped with the installation department on the pivot 7, the installation department is worn out the tip of gear by pivot 7 and is formed along the diameter and along the axial cutting (promptly the installation department is the half cylinder), has seted up screw hole 711 on the plane of installation department, stir roof beam 2 and cantilever beam 1 respective one end with the help of the screw install in corresponding pivot 7 on the installation department.
Further, in order to avoid when rotating planet wheel 4 is drunkenness along the axial, actuating mechanism still is equipped with planet carrier 6, planet carrier 6 with planet wheel 4 and sun gear 3 respective pivot 7 are connected to the butt in the terminal surface of two gears homonymies for the terminal surface of two gears is parallel and level each other, can stir smoothly when guaranteeing to dial roof beam 2 at planet wheel 4 and rotate cantilever beam 1, improves the reliability of system.
From the above, the rotating shaft 7 of this embodiment needs to be provided with a gear (the sun gear 3 or the planet gear 4), a planet carrier 6, and a corresponding beam structure (the cantilever beam 1 or the toggle beam 2), so as to facilitate installation of each component, the rotating shaft 7 is arranged in a multi-stage step shape, and includes a gear installation section 72, a planet carrier installation section 73, and a beam installation section 71 that are sequentially arranged, the gear installation section 72 is provided with a key groove 721 to be fixedly connected with the sun gear 3 or the planet gear 4 by means of a key, the diameter of the planet carrier installation section 73 is smaller than that of the gear installation section 72 and is used for installing the planet carrier 6, and the installation section is arranged on the.
Preferably, since the planet wheel 4 does not need to be connected with an external structure, the length of the rotating shaft 7 of the planet wheel 4 is smaller than that of the rotating shaft 7 of the sun wheel 3, so as to reduce the weight of the planet wheel 4, avoid interference from the external structure and reduce the influence on the operation of the rotating mechanism.
In summary, the piezoelectric energy collector of the present invention, which adopts the planetary gear train to stir the cantilever beam 1 with the piezoelectric chip, has energy conversion efficiency mainly related to the relative rotation of the sun gear 3 and the planet gear 4, is not affected by the rotation speed of the sun gear 3, can improve the piezoelectric energy conversion efficiency in a high speed, uniform speed and wide rotation speed range, and has a broadband effect; in addition, the integrated structure can be conveniently installed on the rotating machinery, and has higher practical application value.
In addition, as shown in the following table, the experimental results show that the average output voltage of the piezoelectric beam is about 4.84V, the duty ratio (time interval between two toggles) is 750ms, and the maximum output voltage is 52.8V at a rotation speed of 50r/min and in an open circuit state.
| Rotating speed (r/min) | Average voltage (V) | Maximum voltage (V) | Duty cycle (ms) |
| 50 | 4.84 | 52.8 | 750 |
| 100 | 5.18 | 56 | 380 |
| 150 | 6.04 | 51.33 | 220 |
And the output average voltage of the traditional piezoelectric cantilever beam 1 is about 1.47V under the rotation speed of 50r/min and the open circuit state. Therefore, the voltage generated by poking the cantilever beam 1 provided with the piezoelectric chip by adopting the planetary gear 4 system is far higher than that of the traditional piezoelectric cantilever beam 1.
As a second aspect, the present invention further relates to a mechanical device (not shown), which includes a rotating mechanism, a sensing device for detecting the performance (such as the rotating speed) of the rotating mechanism, and the piezoelectric energy collector 100 for providing energy to the sensing device, wherein the rotating shaft 7 of the sun gear 3 is fixed to the output shaft of the rotating mechanism (such as a motor), and the ring gear 5 is fixed to the mechanical device.
Through adopting foretell piezoelectric type energy collector, the utility model discloses a mechanical equipment can collect the vibration energy that rotary mechanism produced when rotatory conveniently to turn into the electric energy with it and supply power for sensing device. Because the method of using the planet wheel 4 system to stir the cantilever beam 1 with the piezoelectric chip is adopted, the energy conversion efficiency is mainly related to the relative rotation of the sun wheel 3 and the planet wheel 4, is not influenced by the rotation speed of the sun wheel 3 (namely the rotation speed of the motor), and has stronger system stability.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The piezoelectric type energy collector is suitable for collecting the rotary vibration energy generated by a mechanical equipment rotating mechanism and is characterized by comprising a piezoelectric wafer for collecting the vibration energy, a cantilever beam capable of generating damped vibration and a driving mechanism, wherein the piezoelectric wafer is arranged on the cantilever beam, and the driving mechanism is connected to an output shaft of the rotating mechanism and can rotationally act on the cantilever beam to enable the cantilever beam to generate vibration.
2. The piezoelectric energy harvester of claim 1, wherein the drive mechanism comprises an inner gear ring, a sun gear, a planet gear, and a toggle beam; the planetary gear is meshed with the sun gear and the inner gear ring, and the poking beam is fixed on the rotating shaft of the planetary gear and can poke the cantilever beam periodically when the planetary gear rotates along with the sun gear.
3. The piezoelectric energy harvester of claim 2, further comprising a planet carrier for limiting axial movement of the planet along the axis of rotation.
4. The piezoelectric energy collector according to claim 3 wherein the planet carrier abuts and aligns the end surfaces of the planet and sun on the same side of the planet and sun, and the cantilever beam and the toggle beam are located on the side of the planet carrier away from the corresponding gear.
5. The piezoelectric energy collector according to claim 4, wherein the rotating shafts of the sun wheel and the planet wheel are provided with mounting portions, the mounting portions are provided with screw holes for mounting the cantilever beams or the toggle beams, and the cantilever beams or the toggle beams are fixed on the mounting portions of the rotating shafts by screws.
6. The piezoelectric energy collector according to claim 5, wherein the rotating shaft is arranged in a multi-step manner and comprises a gear mounting section, a planet carrier mounting section and a beam mounting section which are sequentially arranged along an axial direction, the gear mounting section is provided with a key groove to be fixedly connected with a sun gear or a planet gear by a key, the planet carrier mounting section is smaller in diameter than the gear mounting section and is used for mounting the planet carrier, and the mounting section is arranged on the beam mounting section.
7. The piezoelectric energy harvester of claim 6, wherein the planet has an axis of rotation that is shorter than an axis of rotation of the sun.
8. The piezoelectric energy harvester of claim 6, wherein the mount is disposed in the beam mount section in a planar manner, the planar width being equal to the diameter of the pivot.
9. The piezoelectric energy harvester of claim 2, wherein the length of the toggle beam plus the cantilever beam is greater than the radius of the planet and sun, and wherein the toggle beam rotatably overlaps the cantilever beam partially, thereby toggling the cantilever beam into vibration.
10. Mechanical equipment, comprising a rotating structure, a sensing device for detecting the performance of the rotating structure, and a power supply module for supplying power to the sensing device, wherein the power supply module comprises the piezoelectric energy collector of any one of claims 1 to 9, and wherein the driving mechanism is connected with an output shaft of the rotating structure and acts on the cantilever beam in a manner of synchronous rotation with the output shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020017294.XU CN211151849U (en) | 2020-01-03 | 2020-01-03 | Piezoelectric energy collector and mechanical equipment with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020017294.XU CN211151849U (en) | 2020-01-03 | 2020-01-03 | Piezoelectric energy collector and mechanical equipment with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211151849U true CN211151849U (en) | 2020-07-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020017294.XU Expired - Fee Related CN211151849U (en) | 2020-01-03 | 2020-01-03 | Piezoelectric energy collector and mechanical equipment with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211151849U (en) |
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2020
- 2020-01-03 CN CN202020017294.XU patent/CN211151849U/en not_active Expired - Fee Related
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Granted publication date: 20200731 Termination date: 20210103 |
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| CF01 | Termination of patent right due to non-payment of annual fee |