CN112117932A - Power generation device and health monitoring equipment using same - Google Patents
Power generation device and health monitoring equipment using same Download PDFInfo
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- CN112117932A CN112117932A CN202010909633.XA CN202010909633A CN112117932A CN 112117932 A CN112117932 A CN 112117932A CN 202010909633 A CN202010909633 A CN 202010909633A CN 112117932 A CN112117932 A CN 112117932A
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- 238000010248 power generation Methods 0.000 title claims abstract description 94
- 238000012544 monitoring process Methods 0.000 title abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 18
- 230000005484 gravity Effects 0.000 claims abstract description 5
- 230000000712 assembly Effects 0.000 claims description 20
- 238000000429 assembly Methods 0.000 claims description 20
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 2
- 230000005284 excitation Effects 0.000 abstract description 7
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
- H02N2/188—Vibration harvesters adapted for resonant operation
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention discloses a power generation device and health monitoring equipment using the same, wherein the power generation device comprises a shell and a power generation assembly, the power generation assembly is arranged in the shell, the power generation assembly comprises a cantilever part, a mass block and an elastic piece, the mass block and the elastic piece are arranged on the cantilever part, one end of the elastic piece is arranged on the top wall or the bottom wall of the shell, and the action directions of the gravity of the mass block and the elasticity of the elastic piece on the cantilever part are opposite; the cantilever part comprises a plurality of cantilever beams, each cantilever beam is arranged along the circumference, one end of each cantilever beam is arranged on the inner wall of the shell, and the cantilever beams are provided with piezoelectric materials. The power generation assembly effectively converts vibration energy of external excitation into electric energy through vibration of the cantilever part, and is used for supplying power, so that the problem of difficulty in power supply is effectively solved. The invention can be widely applied to the technical field of bridge engineering health monitoring.
Description
Technical Field
The invention relates to the technical field of bridge engineering health monitoring, in particular to a power generation device and health monitoring equipment using the same.
Background
Vibration is ubiquitous in nature and life, and particularly, vibration is generated in vehicles or mechanical equipment during operation, and a lot of mechanical energy is contained in the vibration. If the mechanical energy can be converted into the available electric energy and the electric energy is supplied to some electric equipment which is inconvenient to charge or replace the battery, great convenience is brought.
Health monitoring systems are often arranged in modern bridges and high-rise buildings, the health monitoring systems usually need to embed sensors in the buildings, and if wired sensors are used, the problems of high wiring difficulty, high wiring cost and the like exist, and the power supply cost is high; if use wireless sensor, have the difficult problem of battery replacement, be not convenient for supply power. The inevitable vibration always occurs in the building, particularly the bridge, in the operation process, and the sensor used in the health monitoring system generally consumes less energy, so that the power generation device has high engineering practical significance if the power generation device can be used in the sensor.
Disclosure of Invention
In order to solve at least one of the technical problems, effectively utilize vibration energy of a building to be converted into electric energy and solve the problem of difficult power supply, the invention provides a power generation device and health monitoring equipment using the same, and the adopted technical scheme is as follows:
the health monitoring equipment provided by the invention comprises a wireless sensor and a power generation device, wherein the power generation device is used for supplying power to the wireless sensor.
The power generation device provided by the invention comprises a shell and a power generation assembly, wherein the power generation assembly is arranged in the shell, the power generation assembly comprises a cantilever part, a mass block and an elastic piece, the mass block and the elastic piece are arranged on the cantilever part, one end of the elastic piece is arranged on the top wall or the bottom wall of the shell, and the action directions of the gravity of the mass block and the elastic force of the elastic piece on the cantilever part are opposite; the cantilever part comprises a plurality of cantilever beams, each cantilever beam is arranged along the circumference, one end of each cantilever beam is arranged on the inner wall of the shell, and the cantilever beams are provided with piezoelectric materials.
In some embodiments of the present invention, the power generation assembly is provided in plurality, and each of the power generation assemblies is provided in sequence along an axial direction of the housing.
In some embodiments of the invention, between two adjacent power generation assemblies, one end of the elastic element is disposed on the cantilever portion of one of the power generation assemblies, and the other end of the elastic element is disposed on the mass block or the cantilever portion of the other power generation assembly; after the power generation assemblies are stacked, the elastic part positioned at the outermost side is used for being connected with the top wall or the bottom wall of the shell.
In some embodiments of the invention, the piezoelectric material is disposed on the upper and/or lower side of the cantilever beam.
In some embodiments of the invention, the piezoelectric material is provided as a piezoelectric ceramic or a piezoelectric polymer.
In some embodiments of the invention, the elastic member has a compression elasticity or a tension elasticity.
In some embodiments of the invention, the mass of the mass in each of the power generation assemblies is different and/or the size of the mass in each of the power generation assemblies is different.
In some embodiments of the present invention, the elastic members in each of the power generation modules have different elastic moduli and/or the elastic members in each of the power generation modules have different sizes.
In some embodiments of the invention, the cantilever beam dimensions of different power generation assemblies are different.
The embodiment of the invention has at least the following beneficial effects: the power generation assembly effectively converts vibration energy of external excitation into electric energy through vibration of the cantilever part, and is used for supplying power, so that the problem of difficulty in power supply is effectively solved. The invention can be widely applied to the technical field of bridge engineering health monitoring.
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 schematic structural view of a power generation device, in which a mass block is disposed on an upper side of a cantilever portion, and a housing is shown in a non-closed state for clearly showing structures such as the mass block and the cantilever portion;
FIG. 2 is a cross-sectional view of the power generation device of FIG. 1, showing a mass disposed on an upper side of a cantilever portion, an elastic member disposed on a lower side of the cantilever portion, the elastic member being configured as a compression spring;
fig. 3 is a schematic structural view of the cantilever beam.
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 or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., are used in an orientation or positional relationship indicated based on the drawings, it is merely for convenience of description and simplicity of description, and it is not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore, is not to be considered as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention relates to health monitoring equipment which comprises a wireless sensor and a power generation device, wherein the power generation device is used for supplying power to the wireless sensor. Further, the power generation device is arranged in the wireless sensor, and particularly, the power generation device is arranged in the wireless sensor in an embedded mode. In some examples, the arrangement direction and number of the power generation devices may be adjusted as necessary so that the power generation devices can sufficiently absorb the vibration energy in the main vibration direction.
The power generation device is designed into a spring oscillator system, the health monitoring equipment is installed on the bridge, vibration generated by the bridge provides excitation mainly comprising upper and lower vibration for the power generation device, the power generation device converts vibration energy into electric energy, and the electric energy is supplied to the wireless sensor for use after rectification and voltage stabilization, so that self-driving of the bridge health monitoring equipment is realized.
Other configurations and operations of the health monitoring device are known to those of ordinary skill in the art and will not be described in detail herein, and the structure of the power plant will be described below.
The invention relates to a power generation device which comprises a shell 101 and a power generation assembly, wherein the power generation assembly is arranged in the shell 101, the inner cavity of the shell 101 is cylindrical, and the shell 101 is arranged in a sealing mode. Specifically, the power generation assembly comprises a cantilever part, a mass block 102 and an elastic part 103, the cantilever part comprises a plurality of cantilever beams 104, the power generation benefit is improved during vibration, the cantilever beams 104 are of a steel structure or a brass structure, each cantilever beam 104 is arranged along the circumference, each cantilever beam 104 on the cantilever part is distributed in a radial mode, the cantilever beams 104 have flexibility, one end of each cantilever beam 104 is arranged on the inner wall of the shell 101, and the other end of each cantilever beam 104 is connected to form the middle of the cantilever part. The cantilever beam 104 is provided with a piezoelectric material 105, and in particular, the piezoelectric material 105 is attached to the side of the cantilever beam 104.
The mass block 102 and the elastic element 103 are arranged on the cantilever part, the action directions of the gravity of the mass block 102 and the elastic force of the elastic element 103 on the cantilever part are opposite, when the power generation device is subjected to a vertical direction component from external excitation, the power generation assembly generates vertical reciprocating vibration under the action of the gravity of the mass block 102 and the elastic force of the elastic element 103, and the cantilever beam 104 converts the vibration energy into electric energy by utilizing the piezoelectric effect of the piezoelectric material 105 in the vibration process. In some examples, the mass 102 and the elastic element 103 are respectively disposed at two sides of the cantilever portion, and further, in order to make the cantilever portion uniformly stressed, the mass 102 and the elastic element 103 are respectively disposed at the middle of the side of the cantilever portion. In some examples, the mass 102 and the elastic member 103 are disposed on the same side of the cantilever portion, specifically, the mass 102 is disposed on the side of the cantilever portion, and the elastic member 103 is disposed on the mass 102.
In some embodiments of the present invention, the elastic member 103 has compression elasticity and is used for supporting the cantilever portion, for example, and is configured as a compression spring, and in this case, in the power generation assembly, the elastic member 103 should be configured on the lower side of the cantilever portion. In some examples, the elastic member 103 has tensile elasticity for suspending the cantilever portion, for example, is provided as a tension spring, and in this case, in the power generation module, the elastic member 103 should be provided on the upper side of the cantilever portion.
In some embodiments of the present invention, the number of the power generation assemblies is multiple, for example, three, and each power generation assembly is sequentially arranged along the axial direction of the housing 101 and stacked to form a spring oscillator system with multiple layers, so as to improve the power generation efficiency. In addition, the power generation device which is arranged in a stacked mode is compact in structure, can be used as a small-sized power generator and embedded into portable electronic equipment or a wireless sensor, achieves self-driving of the equipment, and can get rid of magnetic field interference of a traditional electromagnetic power generation device on precise electronic equipment. Further, between two adjacent power generation assemblies, one end of the elastic element 103 is arranged on the cantilever part of one of the power generation assemblies, and the other end of the elastic element 103 is arranged on the mass block 102 or the cantilever part of the other power generation assembly, so that each power generation assembly forms a whole, when one part of the two power generation assemblies is subjected to external excitation to generate vibration, the other part of the two power generation assemblies is driven to generate vibration, the vibration is generated integrally, and the power generation benefit is improved. After the power generation modules are stacked, the elastic member 103 located at the outermost side is used to connect with the top wall or the bottom wall of the housing 101, for example: if the elastic member 103 is provided as a compression spring, the elastic member 103 in the power generation module at the bottom should be provided to be connected with the bottom wall of the housing 101; if the elastic member 103 is provided as a tension spring, the elastic member 103 in the power generation module located at the top should be provided to be connected with the top wall of the case 101.
In some embodiments of the present invention, it may be alternatively designed that the number of the power generating assemblies is set to one, wherein one end of the elastic member 103 is disposed on the top wall or the bottom wall of the housing 101, and the other end of the elastic member 103 is used for applying an elastic force to the cantilever beam 104, so as to form a spring oscillator system. For example: if the elastic member 103 is provided as a compression spring, the elastic member 103 should be provided on the bottom wall of the housing 101; if the elastic member 103 is provided as a tension spring, the elastic member 103 should be provided on the top wall of the housing 101.
In some embodiments of the present invention, piezoelectric material 105 is disposed on the upper and/or lower sides of the cantilever beam 104. In some examples, the piezoelectric material 105 is disposed on the upper or lower side of the cantilever beam 104, and the cantilever beam 104 constitutes a single crystal piezoelectric cantilever. In some examples, the piezoelectric material 105 is disposed on both the upper and lower sides of the cantilever beam 104, and the cantilever beam 104 constitutes a bimorph piezoelectric cantilever.
In some embodiments of the present invention, the piezoelectric material 105 is provided as a piezoelectric ceramic or a piezoelectric polymer. In some examples, the piezoelectric material 105 may also be a combination of piezoelectric ceramic and piezoelectric polymer materials. The choice of piezoelectric material 105 should be selected based on the vibration mode parameter information of the monitored object and cost considerations.
In some embodiments of the present invention, the mass of the mass 102 in each power generation assembly is different and/or the size of the mass 102 in each power generation assembly is different, and is selected according to the vibration mode characteristics of the usage scenario.
In some embodiments of the present invention, the elastic modulus of the elastic member 103 in each power generation assembly is different and/or the size of the elastic member 103 in each power generation assembly is different, and is selected according to the vibration mode characteristics of the usage scenario.
In some embodiments of the present invention, different mass blocks 102 and different elastic members 103 form a multi-layer spring oscillator system with different dynamic characteristics, so that different layers of the power generation device are suitable for different frequency ranges, thereby improving the resonant frequency range, facilitating the generation of resonance with external excitation, and improving the power generation efficiency.
In some embodiments of the present invention, the dimensions of the cantilever beam 104 may be different for different power generation assemblies, and may be selected based on the vibrational mode characteristics of the use scenario. The cantilever beams 104 with different sizes and different mass blocks 102 form structures with different natural vibration frequencies, so that the resonance frequency range is improved, different layers in the power generation device are suitable for different frequency ranges, resonance is generated by excitation outside the environment more easily, and the power generation benefit is improved.
In some embodiments of the invention, the power generation components are arranged in layers, each layer has different self-vibration frequencies, but are connected with each other to form an integral spring vibrator system, when any layer vibrates, other layers are driven to vibrate, and the power generation benefit is improved.
In the description herein, references to the terms "one embodiment," "some examples," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like, if any, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. A power generation device, characterized by: comprises that
A housing (101);
the power generation assembly is arranged in the shell (101), the power generation assembly comprises a cantilever part, a mass block (102) and an elastic piece (103), the mass block (102) and the elastic piece (103) are arranged on the cantilever part, one end of the elastic piece (103) is arranged on the top wall or the bottom wall of the shell (101), and the action directions of the gravity of the mass block (102) and the elastic force of the elastic piece (103) on the cantilever part are opposite;
the cantilever part comprises a plurality of cantilever beams (104), each cantilever beam (104) is arranged along the circumference, one end of each cantilever beam (104) is arranged on the inner wall of the shell (101), and piezoelectric materials (105) are arranged on the cantilever beams (104).
2. The power generation apparatus of claim 1, wherein: the power generation assemblies are arranged in a plurality of numbers, and the power generation assemblies are sequentially arranged along the axial direction of the shell (101).
3. The power generation apparatus of claim 2, wherein: between two adjacent power generation assemblies, one end of the elastic piece (103) is arranged on the cantilever part of one power generation assembly, and the other end of the elastic piece (103) is arranged on the mass block (102) or the cantilever part of the other power generation assembly; after the power generation modules are arranged in a stacked manner, the elastic member (103) located at the outermost side is used for being connected with the top wall or the bottom wall of the shell (101).
4. A power plant according to claim 1 or 2 or 3, characterized in that: the piezoelectric material (105) is disposed on the upper and/or lower side of the cantilever beam (104).
5. The power generation apparatus of claim 4, wherein: the piezoelectric material (105) is provided as a piezoelectric ceramic or a piezoelectric polymer.
6. A power plant according to claim 1 or 2 or 3, characterized in that: the elastic member (103) has compression elasticity or tensile elasticity.
7. A power plant according to claim 2 or 3, characterized in that: the masses (102) in each of the power generation assemblies are of different masses and/or the masses (102) in each of the power generation assemblies are of different sizes.
8. A power plant according to claim 2 or 3, characterized in that: the elastic members (103) in the respective power generation modules have different elastic moduli and/or the elastic members (103) in the respective power generation modules have different sizes.
9. A power plant according to claim 2 or 3, characterized in that: the cantilevered beams (104) of different power generation assemblies are differently sized.
10. A health monitoring device, characterized by: comprises that
A wireless sensor;
the power generation apparatus of any one of claims 1 to 9, for supplying power to the wireless sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010909633.XA CN112117932A (en) | 2020-09-02 | 2020-09-02 | Power generation device and health monitoring equipment using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010909633.XA CN112117932A (en) | 2020-09-02 | 2020-09-02 | Power generation device and health monitoring equipment using same |
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| CN112117932A true CN112117932A (en) | 2020-12-22 |
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| CN202010909633.XA Pending CN112117932A (en) | 2020-09-02 | 2020-09-02 | Power generation device and health monitoring equipment using same |
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