CN116231947B - Energy collection device and self-powered vibration monitoring device suitable for transmission line - Google Patents
Energy collection device and self-powered vibration monitoring device suitable for transmission line Download PDFInfo
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- CN116231947B CN116231947B CN202310261594.0A CN202310261594A CN116231947B CN 116231947 B CN116231947 B CN 116231947B CN 202310261594 A CN202310261594 A CN 202310261594A CN 116231947 B CN116231947 B CN 116231947B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1869—Linear generators; sectional generators
- H02K7/1876—Linear generators; sectional generators with reciprocating, linearly oscillating or vibrating parts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/06—Influence generators
- H02N1/08—Influence generators with conductive charge carrier, i.e. capacitor machines
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Abstract
The invention discloses an energy collecting device and a self-powered vibration monitoring device suitable for a power transmission line, wherein the energy collecting device comprises a stator assembly, a rotor assembly and an elastic power generation assembly; the stator assembly comprises a shell, and a transmission bar is vertically and fixedly arranged between a top plate and a bottom plate of the shell; the rotor assembly comprises a counterweight shell and an electromagnetic generator fixedly arranged on the counterweight shell, the counterweight shell is movably arranged in a shell of the stator assembly up and down, and an input shaft of the electromagnetic generator is in transmission connection with the transmission bar; the elastic power generation assembly comprises a plurality of paper folding spring power generation units, at least one paper folding spring power generation unit is respectively arranged between the counterweight housing and the top plate and the bottom plate of the housing, and the end part of each paper folding spring power generation unit is fixedly connected with the counterweight housing, the housing top plate or the housing bottom plate towards which the corresponding end faces. The invention can collect energy generated by vibration of the power transmission line, convert the energy into electric energy required by vibration detection, promote the generated power and ensure the reliable operation of monitoring the power transmission line.
Description
Technical Field
The invention relates to the technical field of power transmission and new energy development, in particular to an energy collecting device and a self-powered vibration monitoring device suitable for a power transmission line.
Background
The real-time monitoring of the high-altitude power transmission line has very important significance for the normal operation of the power grid, and the sensor for monitoring the power transmission line often adopts a battery-powered mode, so that the problems of difficult maintenance, environmental pollution and the like exist. With the increasing number of sensors, how to provide an effective energy supply is the subject of many scholars.
In patent number CN 110460262B, entitled "a spherical electret wave power generation device", a spherical electret wave power generation device is reported, when the spherical electret wave power generation device is impacted by external low-frequency waves, the relative displacement in the space between the inner nuclear body and the outer shell body is generated, and the three-dimensional electric energy capturing unit generates continuous high voltage. The method has a certain application value, but the output electric energy has the characteristics of high voltage and low current, and the whole power is low, so that the method is not enough to directly supply power to some sensors. Therefore, other energy supply modes are required to be introduced, so that the overall generated power is improved, the stable operation of the sensor on the transmission line is ensured, and the transmission line is reliably monitored.
Disclosure of Invention
The invention aims to provide an energy collecting device and a self-powered vibration monitoring device suitable for a power transmission line, which can collect energy generated by vibration of the power transmission line, convert the energy into electric energy required by vibration detection, improve the power generation power and ensure the reliable operation of the power transmission line monitoring. The technical scheme adopted by the invention is as follows.
In one aspect, the present invention provides an energy harvesting apparatus comprising a stator assembly, a mover assembly, and an elastic power generation assembly;
The stator assembly comprises a shell, and a transmission bar is vertically and fixedly arranged between a top plate and a bottom plate of the shell;
The rotor assembly comprises a counterweight shell and an electromagnetic generator fixedly arranged on the counterweight shell, the counterweight shell is movably arranged in a shell of the stator assembly up and down, and an input shaft of the electromagnetic generator is in transmission connection with the transmission bar;
the elastic power generation assembly comprises a plurality of paper folding spring power generation units, at least one paper folding spring power generation unit is respectively arranged between the counterweight housing and the top plate and the bottom plate of the housing, and the end part of each paper folding spring power generation unit is fixedly connected with the counterweight housing, the housing top plate or the housing bottom plate towards which the corresponding end faces.
When the electromagnetic energy collection device is applied, when the energy collection device vibrates, the counterweight shell reciprocates up and down under the combined action of the vibration force and the elasticity of the paper folding spring power generation unit, the input shaft of the electromagnetic generator is driven to roll back and forth on the transmission bar, and the reciprocating rotation of the input shaft of the electromagnetic generator is realized, so that the conversion output from mechanical energy to electric energy is realized by the electromagnetic generator. Meanwhile, compression and extension of the paper folding spring power generation unit influence charge distribution, and conversion output from mechanical energy to electric energy can be realized.
Optionally, the energy collecting device further comprises a metal shielding shell, wherein the metal shielding shell comprises a first shell and a second shell which can be butted into a closed cavity, and the first shell and the second shell are detachably and fixedly connected;
the stator assembly, the rotor assembly and the elastic power generation assembly are all positioned in the closed cavity of the metal shielding shell.
Optionally, the first shell is in threaded connection with the second shell; the upper ends of the first shell and the second shell are respectively provided with a hanging lug. The hanging lugs are used for being hung on the power transmission line of the application scene.
Optionally, the casing of stator module includes the curb plate of symmetry setting, both ends are linked firmly respectively about the curb plate roof and bottom plate, the counter weight shell sliding connection of runner assembly the curb plate.
Preferably, guide strips are vertically arranged at two side parts of the counterweight housing, guide grooves matched with the guide strips are vertically arranged at the inner sides of the side plates, and the counterweight housing is slidably connected with the guide grooves of the housing through the guide strips. The arrangement of the guide structure can enable the up-and-down movement of the rotor assembly to be more stable when vibration occurs, the influence of extrusion deformation on the paper folding spring power generation unit arranged at the upper part and the lower part is more regular, and the electric energy output of the paper folding spring power generation unit and the electromagnetic generator is more stable.
Optionally, two sides of the upper end and the lower end of the counterweight shell are respectively connected with the paper folding spring power generation unit.
Optionally, defining the height of the counterweight housing as D 1, the distance between the lower surface of the top plate and the upper surface of the bottom plate of the stator housing as D 2, the minimum length of the paper folding spring power generation unit after compression as L 1, and the maximum length of the paper folding spring power generation unit after stretching as L 2; the above data satisfy the dimensional relationship:
The relationship between the above dimensions is defined, and the maximization of the electric energy capturing efficiency can be achieved.
Optionally, the bottom electrode and the counter electrode of the paper folding spring power generation unit are respectively of rectangular sheet structures folded into continuous W shapes, and are cross-folded and fold lines are mutually perpendicular to form a spring-shaped structure;
The bottom electrode is of a three-layer structure formed by sequentially superposing a copper sheet, a poly-milling imine and a copper sheet; the counter electrode is of a five-layer structure formed by sequentially superposing an electret film, a copper sheet, a poly-milling imine, a copper sheet and the electret film, and the electret film is adhered and covered on two sides of the three-layer structure;
The electret film is prepared from Parylene, teflon or silicon dioxide, and is charged with preset charges through corona polarization to form surface bias voltage. When the elastic power generation unit is compressed due to external vibration, the dielectric layer gap becomes small, and the bottom electrode generates charges opposite to the preset charges due to electrostatic induction; when stretching occurs, the dielectric layer gap becomes larger and the bottom electrode charge re-flows away, converting mechanical energy into electrical energy.
Optionally, the paper folding spring power generation units are connected in series or in parallel to form a linear power generation network.
Optionally, two ends of the transmission bar are respectively fixedly connected with a top plate and a bottom plate of the shell, and the middle part of the transmission bar penetrates through the counterweight shell; the electromagnetic generator is fixedly arranged on a positioning seat in the counterweight shell, and an input shaft of the electromagnetic generator is in rolling connection with the transmission strip in the counterweight shell.
Optionally, the transmission strip is a rack, a gear is fixedly connected to the tail end of the input shaft of the electromagnetic generator, and the input shaft of the electromagnetic generator is meshed with the rack through the gear to realize transmission connection.
According to the technical scheme, when vibration occurs, the counterweight housing moves up and down in a reciprocating manner, the gear on the input shaft of the electromagnetic generator rolls on the rack along with the gear, the input shaft of the electromagnetic generator generates direct current when rotating, and the direct current with different polarities can be output by forward rotation and reverse rotation.
Optionally, the positioning seat is provided with a concave part matched with the electromagnetic generator, and the electromagnetic generator is installed in the concave part in an interference fit manner; and the side wall of the counterweight shell is provided with a mounting hole. The position of the mounting hole should enable the electromagnetic generator to reach the concave part of the positioning seat after entering the counterweight shell from the mounting hole, so as to facilitate the installation of the electromagnetic generator. Furthermore, the electrical power outlet line of the electromagnetic generator can be led out via the mounting hole.
In a second aspect, the present invention provides a self-powered vibration monitoring device comprising a vibration sensor and an energy harvesting device as described in the first aspect;
In the energy collecting device, an electric energy output end of at least one of the electromagnetic generator and the elastic power generation assembly is used for providing a working power supply for the vibration sensor.
Advantageous effects
According to the energy collecting device, the stator assembly and the rotor assembly are arranged, and the elastic power generation unit is arranged at the same time, so that two power generation modes of static induction and electromagnetic induction are coupled together, and vibration energy can be effectively and efficiently collected and converted into electric energy. In addition, the direct current generated by electromagnetic power generation has the characteristics of low voltage and high current, the electric energy generated by the elastic power generation unit has the characteristics of high voltage and low current, and the two power generation modes have complementary performances, so that the power generation power can be obviously improved.
Because electromagnetic induction power generation and electrostatic induction power generation are integrated at the same time, the electromagnetic induction power generation power is higher, and therefore the energy collection device can be used for sensor energy supply, a self-powered vibration monitoring device is realized, the monitoring of the vibration state of a power transmission line is realized, and the safe and reliable operation of the power transmission line is ensured.
Drawings
FIG. 1 is a schematic view showing the outline structure of an energy collecting apparatus according to an embodiment of the present invention;
FIG. 2 is an exploded schematic view of the energy harvesting device of FIG. 1;
FIG. 3 is a schematic view showing the internal structure of the metal shield of FIG. 1;
FIG. 4 is a schematic view showing the mounting structure of the top plate and rack of the housing;
FIG. 5 is a schematic view of a side wall structure of the housing;
FIG. 6 is a schematic view of the structure of the weight housing in the mover assembly;
FIG. 7 is a schematic diagram of a paper folding spring power generation unit;
FIG. 8 is a schematic diagram of the structure of the bottom electrode and counter electrode in a paper folding spring power generation unit;
FIG. 9 is a schematic diagram showing the change of state of the energy harvesting device when vibrating;
FIG. 10 is a schematic diagram of waveforms of output voltages of an electromagnetic generator of an energy harvesting apparatus at different frequencies;
FIG. 11 is a schematic diagram showing waveforms of output voltage signals of a power generation network formed by connecting a plurality of elastic power generation units in parallel in four different vibration states in an energy collecting device;
fig. 12 is a schematic diagram showing the state recognition of the confusion matrix for four different vibration conditions.
In fig. 1-12, 1, transmission line; 2. a first housing; 2-1, a first shell through hole; 3. a second housing; 3-1, a second shell through hole; 4. a top plate; 4-1, a transmission bar and a rack; 5. a bottom plate; 6. a sidewall; 6-1, a guide groove; 7. a paper folding spring power generation unit; 7-1, a bottom electrode; 7-2, a counter electrode; 8. a weight housing; 8-1, a guide bar; 8-2, mounting holes; 8-3, positioning seats; 8-4, through holes; 9. an electromagnetic generator; 10. a gear; 11. a screw; 12. a nut; 13. an assembly of a stator assembly, a mover assembly and an elastic power generation assembly.
Detailed Description
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, or may be internal communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Further description is provided below in connection with the drawings and the specific embodiments.
Example 1
Referring to fig. 1 to 8, the present embodiment describes an energy harvesting apparatus comprising a stator assembly, a mover assembly, and an elastic power generation assembly;
the stator assembly comprises a shell, and a transmission bar 4-1 is vertically and fixedly arranged between a top plate 4 and a bottom plate 5 of the shell;
The rotor assembly comprises a counterweight shell 8 and an electromagnetic generator 9 fixedly arranged on the counterweight shell 8, the counterweight shell 8 is movably arranged in a shell of the stator assembly up and down, and an input shaft of the electromagnetic generator 9 is in transmission connection with the transmission bar 4-1;
The elastic power generation assembly comprises a plurality of paper folding spring power generation units 7, at least one paper folding spring power generation unit 7 is respectively arranged between the counterweight housing 8 and the top plate 4 and the bottom plate 5 of the housing, and the counterweight housing 8, the housing top plate 4 or the housing bottom plate 5 towards which the corresponding ends face are fixedly connected to the end parts of the paper folding spring power generation units 7.
Referring to fig. 1 and 2, in order to facilitate installation of the energy mobile phone device and shield external electromagnetic interference, in this embodiment, the energy collecting device further includes a metal shielding shell, where the metal shielding shell includes a first shell 2 and a second shell 3 that can be butted into a closed cavity, and the first shell 2 and the second shell 3 are detachably and fixedly connected; the stator assembly, the rotor assembly and the elastic power generation assembly are all positioned in the closed cavity of the metal shielding shell.
The first shell is in threaded connection with the second shell; the upper ends of the two are respectively provided with an X-shaped hanging lug, the lower two branches of the X-shaped hanging lug are arc-shaped and fixed on the peripheries of the upper ends of the first shell and the second shell, a concave part between the two branches of the upper part of the X-shaped hanging lug is used for accommodating a power transmission line, and through holes are formed in the tail ends of the two branches and are used for being matched with a pin shaft or a bolt 11 and a nut 12, so that the metal shielding shell can be reliably hung on the power transmission line of an application scene.
As shown in fig. 2 and fig. 3 to fig. 5, in this embodiment, the housing of the stator assembly includes symmetrically disposed side plates 6, the upper and lower ends of the side plates 6 are respectively and fixedly connected to the top plate 4 and the bottom plate 5, and the counterweight housing 8 of the mover assembly is slidably connected to the side plates 6. The top plate 4, the bottom plate 5 and the two side walls 6 are made of polymethyl methacrylate or ABS plastic or resin, and the counterweight housing 8 is made of aluminum alloy or die steel.
The specific implementation mode of the vertical sliding of the counterweight housing 8 in the housing is as follows: the two side parts of the counterweight shell 8 are vertically provided with guide strips 8-1, as shown in fig. 6, the inner side of the side plate is vertically provided with guide grooves 6-1 matched with the guide strips, as shown in fig. 5, and the counterweight shell is in sliding connection with the guide grooves of the shell through the guide strips. When the rotor assembly moves up and down in the stator assembly shell, the guide groove 6-1 and the guide strip 8-1 keep clearance fit, so that the movement of the counterweight shell 8 can be effectively limited, and the movement track of the counterweight shell is always kept in the vertical direction.
In this embodiment, as shown in fig. 2, 4 and 6, two ends of the driving bar are respectively and fixedly connected to the top plate and the bottom plate of the housing, and of course, only one of the top plate and the bottom plate may be fixedly connected. The middle part of the transmission bar 4-1 penetrates through the counterweight shell 8 through the upper through hole 8-4 and the lower through hole; the electromagnetic generator 9 is fixedly arranged on the positioning seat 8-3 in the counterweight shell 8, and an input shaft of the electromagnetic generator 9 is in rolling connection with the transmission bar in the counterweight shell.
The positioning seat 8-3 is provided with a concave part matched with the electromagnetic generator 9, and the electromagnetic generator 9 is installed in the concave part in an interference fit manner; and the side wall of the counterweight shell 8 is provided with a mounting hole 8-2. The position of the mounting hole should enable the electromagnetic generator to reach the concave part of the positioning seat after entering the counterweight shell from the mounting hole, so as to facilitate the installation of the electromagnetic generator. Furthermore, the electrical power outlet line of the electromagnetic generator can be led out via the mounting hole.
In this embodiment, the driving bar 4-1 is a rack, a gear 10 is fixedly connected to the end of the input shaft of the electromagnetic generator 9, and the input shaft of the electromagnetic generator 9 is meshed with the rack through the gear to realize driving connection. When vibration occurs, the counterweight housing reciprocates up and down, a gear on the input shaft of the electromagnetic generator rolls on the rack along with the gear, the input shaft of the electromagnetic generator generates direct current when rotating, and the direct current with different polarities can be output by forward rotation and reverse rotation.
The electromagnetic generator 9 can be a small-size direct current generator, so that the damping is small when the input shaft rotates, and the small-amplitude vibration is easy to capture and convert into the self-rotation motion. When the input shaft of the electromagnetic generator 9 is rotated, the coil turns and cuts the magnetically induced wire, thereby producing a higher current.
Referring to fig. 10, the electromagnetic generator has different outputs at different vibration frequencies of the transmission line, the output end of the electromagnetic generator is connected to a circuit with a load of 60 ohms (the internal resistance of the electromagnetic generator is about 60 ohms), vibration with different frequencies is applied to the whole device, and the amplitude is less than 1 cm. When the frequencies are respectively 2Hz, 3Hz and 4.5Hz, the voltages at the two ends of the load are respectively 0.5V, 1.5V and 4V, and the output power of the electromagnetic generator reaches the maximum and exceeds 260mW. Wherein the voltage is significantly higher at a frequency of 4.5Hz than at its frequency, indicating that 4.5Hz is about the resonant frequency of the device. In addition, the mass of the sub-assembly part in the energy collecting device can be adjusted to further adjust the resonance frequency of the whole energy collecting device, so that the output of the maximum power can be achieved.
As shown in fig. 3, in this embodiment, two sides of the upper and lower ends of the counterweight housing 8 are respectively connected to the paper folding spring power generation units 7, and a plurality of paper folding spring power generation units may be connected in series or in parallel to form a linear power generation network.
Referring to fig. 7 and 8, the bottom electrode 7-1 and the counter electrode 7-2 of the paper folding spring power generation unit 7 are respectively rectangular sheet structures folded into continuous W shapes, and are cross-folded and have folds perpendicular to each other to form a spring structure, and the bottom electrode and the counter electrode can be respectively connected with a lead-out wire or a lead-out electrode.
The bottom electrode 7-1 is of a three-layer structure formed by sequentially superposing a copper sheet, a poly-milling imine and a copper sheet; the counter electrode 7-2 is a five-layer structure formed by sequentially superposing an electret film, a copper sheet, a poly-milled imine, a copper sheet and the electret film, wherein the electret film is covered on two sides of the three-layer structure through adhesives such as resin.
The electret film is prepared from Parylene, teflon or silicon dioxide, and is charged with preset charges through corona polarization to form surface bias voltage. When the elastic power generation unit is compressed due to external vibration, the dielectric layer gap becomes small, and the bottom electrode generates charges opposite to the preset charges due to electrostatic induction; when stretching occurs, the dielectric layer gap becomes larger and the bottom electrode charge re-flows away, converting mechanical energy into electrical energy.
To maximize electrical energy capture efficiency, the present embodiment explores the relationship between a plurality of structural dimensions in an energy harvesting device, including: if the height of the defined counterweight shell is D 1, the distance between the lower surface of the top plate of the stator shell and the upper surface of the bottom plate is D 2, the minimum length of the compressed paper folding spring power generation unit is L 1, and the maximum length of the compressed paper folding spring power generation unit is L 2; the above data satisfy the dimensional relationship:
Referring to fig. 2, the energy collecting device of the present embodiment can be assembled from inside to outside in application:
First, installing a rotor assembly part: the gear 10 is assembled on the input shaft of the electromagnetic generator 9 in an interference fit mode, the electromagnetic generator 9 is arranged on the positioning protrusion 8-3 through the side wall through hole 8-2 of the cavity mass block 8, the inner diameter of the positioning protrusion 8-3 is slightly smaller than the diameter of the electromagnetic generator 9, interference fit is achieved, and the electromagnetic generator 9 can be fixed in the cavity mass block 8;
second, mounting the stator assembly part: the rack 4-1 of the top plate passes through the upper through hole 8-4 and the lower through hole 8-4 of the cavity mass block 8 and is contacted with the bottom plate 5, meanwhile, the two side walls 6 are placed between the top plate 4 and the bottom plate 5, and the joint is adhered by glue;
Third part, install the elastic power generation assembly: the upper surface and the lower surface of the cavity mass block 8 are respectively adhered to one end of the paper folding spring power generation unit 7, and the other end of the paper folding spring power generation unit 7 is respectively adhered to the lower surface of the top plate 4 and the upper surface of the bottom plate 5;
Fourth part, encapsulation: part of an assembly body 13 of the stator assembly, the rotor assembly and the elastic power generation assembly is embedded into the left half part of the metal shielding shell, the left and right shells are abutted and screwed, and screws 11 respectively penetrate through the left shielding shell through hole and the right shielding shell through hole and are screwed by nuts 12, so that the whole power transmission line energy collecting device is tightly hung on a power transmission line.
The working principle of the embodiment is as follows: because of the structural combination design of the stator component, the rotor component and the elastic power generation component in the energy collection device, the counterweight shell between the top plate and the bottom plate of the shell is always in an unstable state, and when the power transmission line 1 vibrates due to wind energy, on one hand, the counterweight shell 8 can reciprocate in the vertical direction in space, as shown in fig. 9, drives the elastic power generation unit 7 to generate telescopic changes of different degrees, and further generates high output voltage based on the electrostatic induction principle. The output voltages of the plurality of elastic power generation units 7 are processed to have high output voltages. On the other hand, since the electromagnetic generator 9 is already fixed in the counterweight housing 8, the electromagnetic generator 9 and the hollow mass block 8 reciprocate together, and in the process, the gear 10 on the output shaft of the electromagnetic generator 9 is meshed with the rack 4-1 to continuously reciprocate, so that direct current output with alternating positive and negative is generated, and the conversion of mechanical energy into electric energy is realized.
In practical application, the elastic power generation unit 7 outputs alternating current, and the electromagnetic power generator 9 outputs alternating positive and negative direct current, so that the alternating current and the alternating positive and negative direct current can be converted into direct current with the same polarity through the rectifier, and finally collected to the outside for storage or direct utilization.
Experiments prove that the energy collection device of the embodiment has the advantages of compact structure, high power generation efficiency, long service life, environmental protection and the like, and can supply energy to the sensor for online monitoring of the power transmission line, so that the power grid can run safely and reliably.
Example 2
This embodiment describes a self-powered vibration monitoring device comprising a vibration sensor and the energy harvesting device described in embodiment 1;
In the energy collecting device, an electric energy output end of at least one of the electromagnetic generator and the elastic power generation assembly is used for providing a working power supply for the vibration sensor.
When the vibration sensor and the energy collecting device are respectively installed on the power transmission line in application, as shown in fig. 2, when the power transmission line vibrates, the electromagnetic generator and the elastic power generation assembly in the energy collecting device output electric energy to provide a direct or indirect working power supply for the sensor. In addition, the generated electric energy can be stored by the energy storage battery, so that the operation reliability of the sensor is further ensured.
In the embodiment, a plurality of paper folding spring power generation units are connected in parallel to form a power generation network, so that voltage signals under four different vibration states are output. Fig. 11 (a) -11 (d) show voltage signals measured in the up-down, gust, left-right, and high-frequency continuous vibration states of the power line, respectively. The power supply of the vibration sensor is applied to the power supply of the vibration sensor, and the monitoring of the vibration state of the power transmission line can be realized by combining deep learning.
FIG. 12 is a diagram showing the state recognition of the confusion matrix for the four different vibration conditions in FIGS. 11 (a) -11 (d). In this embodiment, the vibration monitoring signals of the self-powered sensor are combined with the deep learning under different vibration states of the power transmission line, so as to monitor the vibration state of the power transmission line, and as shown in the figure, the accuracy of identification reaches 92.5%. That is, the self-powered vibration monitoring device of the present embodiment can provide a more reliable vibration monitoring result.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are all within the protection of the present invention.
Claims (8)
1. The energy collecting device is characterized by comprising a stator assembly, a rotor assembly, an elastic power generation assembly and a metal shielding shell;
The stator assembly comprises a shell, and a transmission bar is vertically and fixedly arranged between a top plate and a bottom plate of the shell;
The rotor assembly comprises a counterweight shell and an electromagnetic generator fixedly arranged on the counterweight shell, the counterweight shell is movably arranged in a shell of the stator assembly up and down, and an input shaft of the electromagnetic generator is in transmission connection with the transmission bar;
The two ends of the transmission bar are respectively fixedly connected with a top plate and a bottom plate of the shell, and the middle part of the transmission bar penetrates through the counterweight shell; the electromagnetic generator is fixedly arranged on a positioning seat in the counterweight shell, and an input shaft of the electromagnetic generator is in rolling connection with the transmission bar in the counterweight shell; the transmission bar is a rack, the tail end of the input shaft of the electromagnetic generator is fixedly connected with a gear, and the input shaft of the electromagnetic generator is meshed with the rack through the gear to realize transmission connection; the positioning seat is provided with a concave part matched with the electromagnetic generator, and the electromagnetic generator is installed in the concave part in an interference fit manner; the side wall of the counterweight shell is provided with a mounting hole;
The elastic power generation assembly comprises a plurality of paper folding spring power generation units, at least one paper folding spring power generation unit is respectively arranged between the counterweight housing and the top plate and the bottom plate of the housing, and the end part of each paper folding spring power generation unit is fixedly connected with the counterweight housing, the housing top plate or the housing bottom plate towards which the corresponding end faces;
The bottom electrode and the counter electrode of the paper folding spring power generation unit are respectively of rectangular sheet structures folded into continuous W shapes, and are crossed and folded, and folds are mutually perpendicular to form a spring-shaped structure; the bottom electrode is of a three-layer structure formed by sequentially superposing a copper sheet, a poly-milling imine and a copper sheet; the counter electrode is of a five-layer structure formed by sequentially superposing an electret film, a copper sheet, a poly-milling imine, a copper sheet and the electret film, and the electret film is adhered and covered on two sides of the three-layer structure; the electret film is prepared from Parylene, teflon or silicon dioxide, and is charged with preset charges through corona polarization to form surface bias voltage;
The metal shielding shell comprises a first shell and a second shell which can be butted into a closed cavity, and the first shell and the second shell are detachably and fixedly connected; the upper ends of the first shell and the second shell are respectively provided with a hanging lug for being hung on an electric transmission line of an application scene;
the stator assembly, the rotor assembly and the elastic power generation assembly are all positioned in the closed cavity of the metal shielding shell.
2. The energy harvesting device of claim 1, wherein the first housing and the second housing are threadably connected.
3. The energy harvesting device of claim 1, wherein the housing of the stator assembly comprises symmetrically disposed side plates, the top and bottom plates are respectively secured to the upper and lower ends of the side plates, and the counterweight housing of the mover assembly is slidably coupled to the side plates.
4. The energy harvesting device of claim 3, wherein guide bars are vertically disposed on both side portions of the weight housing, guide grooves adapted to the guide bars are vertically disposed on inner sides of the side plates, and the weight housing is slidably connected to the guide grooves of the housing through the guide bars.
5. The energy collecting device according to claim 1, wherein the two sides of the upper and lower ends of the weight housing are respectively connected to the paper folding spring power generation unit.
6. The energy harvesting device of claim 1, wherein the weight housing height is defined as D 1, the distance between the top plate lower surface and the bottom plate upper surface of the stator housing is D 2, the minimum length of the paper folding spring power generation unit after compression is L 1, and the maximum length after stretching is L 2; the above data satisfy the dimensional relationship:
。
7. the energy harvesting device of claim 1, wherein the plurality of paper folding spring power generation units are connected in series or in parallel to form a linear power generation network.
8. A self-powered vibration monitoring device comprising a vibration sensor and an energy harvesting device according to any one of claims 1-7;
In the energy collecting device, an electric energy output end of at least one of the electromagnetic generator and the elastic power generation assembly is used for providing a working power supply for the vibration sensor.
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