Self-powered multifunctional wireless sensing system based on wind energy friction nanometer generator

Abstract

The invention discloses a self-powered multifunctional wireless sensing system based on a wind energy friction nano-generator, which comprises a self-powered module, the self-powered module is provided with the wind energy friction nano-generator capable of generating alternating current, and the self-powered module comprises a supporting seat and a friction power generation assembly fixedly assembled on the supporting seat; the friction power generation assembly comprises a wind energy rotating mechanism, an FEP film sleeve layer, a first power generation copper electrode set and a second power generation copper electrode set, the first power generation copper electrode set and the second power generation copper electrode set are fixedly attached to the outer side of the fixing cylinder, and the FEP film sleeve layer is connected to the outer side of the first power generation copper electrode set and the outer side of the second power generation copper electrode set in a sleeving mode. The wind energy rotating mechanism is connected to the outer side of the FEP film sleeve layer in a sliding and sleeving mode. Two copper foil sheets are arranged in the wind energy rotating mechanism; the wireless sensing module is electrically connected with the first power generation copper electrode group, and the wired energy supply module is electrically connected with the second power generation copper electrode group. The friction nanometer generator can supply power to the wireless unit and the wired unit at the same time, and the utilization efficiency of the friction nanometer generator on wind energy is improved.

Description

Technical Field

[0001] The invention relates to the field of wireless sensing technology, and in particular to a self-powered multifunctional wireless sensing system based on a wind energy friction nanogenerator. Background Art

[0002] With the rapid development of Internet of Things (IoT) technology, we have entered the era of the Internet of Everything. The realization of Internet technology relies on a large number of distributed sensor networks, and realizes intelligence through signal transmission between various information communication devices. Therefore, this requires a large number of distributed sensors as perception terminals to detect and perceive the many information required for human work and life. How to power a large number of distributed sensors has become an important issue at present. However, most of the current wireless sensor networks are directly powered by batteries, and their working time and service life are restricted by the battery condition. Considering that a large number of distributed sensors are often deployed in mountains, rivers and even extreme natural environments, this undoubtedly increases the cost of maintaining and replacing batteries.

[0003] In order to solve the battery cost problem, new energy harvesting technologies such as electromagnetic, piezoelectric and triboelectric mechanisms have been proposed in recent years to achieve self-powering of wireless sensors by capturing energy from the surrounding environment. Triboelectric nanogenerators (TENGs) have made significant progress in environmental energy harvesting, showing significant advantages such as flexible manufacturing material selection, low cost and easy processing. TENGs with different structures can be used to effectively collect renewable energy from wind, rivers, raindrops and vibrations for self-powering of sensor devices.

[0004] As a clean renewable energy, wind energy has a lower development and utilization cost than solar energy, so it is currently the most promising energy source among renewable energy sources. Considering that a large number of distributed sensors are widely deployed in the natural environment and wind energy resources are abundant, building a self-powered wireless sensor system based on TENG technology has great application prospects.

[0005] However, the existing wind wireless sensing systems based on friction nanogenerators have limited functions and can only work alone in wireless units or wired units, resulting in low wind energy utilization efficiency. Summary of the invention

[0006] Based on this, it is necessary to provide a self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator to address the above technical problems, which can power both the wireless unit and the wired unit at the same time and improve the utilization efficiency of wind energy by the friction nanogenerator.

[0007] The present invention provides a self-powered multifunctional wireless sensing system based on a wind energy friction nanogenerator, comprising:

[0008] A self-powered module, provided with a wind-powered friction nanogenerator capable of generating alternating current;

[0009] A wireless sensing module is electrically connected to the self-powered module and is used to wirelessly transmit a wireless signal carrying sensor-specific information generated by the alternating current generated by the wind-powered friction nanogenerator and process the signal to generate target measurement parameters;

[0010] A wired power supply module, electrically connected to the self-power supply module, is used to convert the alternating current generated by the wind-powered friction nanogenerator into direct current for storage to power low-power electronic devices;

[0011] The wind energy friction nanogenerator comprises a support seat and a friction power generation component fixedly assembled on the support seat;

[0012] The support seat is provided with a fixed cylinder, and the friction power generation assembly includes a wind energy rotating mechanism, a FEP film sleeve, a first power generation copper electrode group and a second power generation copper electrode group. The first power generation copper electrode group and the second power generation copper electrode group are both fixedly attached to the outside of the fixed cylinder, the first power generation copper electrode group is arranged above the second power generation copper electrode group, the FEP film sleeve is sleeved on the outside of the first power generation copper electrode group and the second power generation copper electrode group, and the wind energy rotating mechanism is slidably sleeved on the outside of the FEP film sleeve;

[0013] The wind energy rotating mechanism is provided with a cylindrical rotating drum for rotating relative to the fixed drum under the action of wind energy, and two copper foils are arranged in the upper and lower parts of the cylindrical rotating drum, and the copper foils are fixedly attached to the inner wall of the cylindrical rotating drum;

[0014] The wireless sensing module is electrically connected to the first power generation copper electrode group, and the wired energy supply module is electrically connected to the second power generation copper electrode group.

[0015] In one embodiment, the support base is further provided with a base plate and a connecting piece, the fixing tube is fixedly connected to the top of the base plate, and the connecting piece is fixedly connected to an end of the fixing tube away from the base plate;

[0016] The base plate is provided with a connection hole that can be matched and installed with the connection piece;

[0017] The side wall of the fixing cylinder is provided with at least one wire hole for connecting and threading the power generation copper electrode group with the wireless sensor module or the wired energy supply module.

[0018] In one of the embodiments, multiple groups of wind energy capture components are disposed on the outer side of the cylindrical rotor;

[0019] The wind energy capture assembly includes a wind arm and a hemispherical wind cup, one end of the wind arm is fixedly connected to the cylindrical drum, and the hemispherical wind cup is fixedly connected to the other end of the wind arm;

[0020] The opening of the wind cup is perpendicular to the axis of the fixed cylinder.

[0021] In one of the embodiments, the wireless sensing module includes a transmitting unit for transmitting wireless signals of different functions, a receiving unit for receiving wireless signals of different functions, and a human-computer interaction unit for acquiring and processing the wireless signals sent by the receiving unit to obtain target measurement parameters;

[0022] The transmitting unit includes a transmitting resonant circuit and a tip discharge structure, the transmitting resonant circuit includes an equivalent resistor R0, a sensor unit and an equivalent inductor L0 connected in series in sequence, and the wind energy friction nanogenerator and the tip discharge structure are both connected in series to the transmitting resonant circuit;

[0023] The sensor unit is an inductive sensor unit or a capacitive sensor unit with different functions. The inductive sensor unit includes an inductive sensor LS, and the capacitive sensor unit includes a capacitive sensor Cs and an inductive sensor LS having a fixed value connected in parallel with the capacitive sensor.

[0024] In one embodiment, the wired energy supply module includes a rectifier bridge formed by four identical diodes connected in series in the same direction and then closed, an energy storage capacitor, a low-power switch, and a low-power electronic device;

[0025] There is an interface between any two diodes of the rectifier bridge, the positive and negative poles of the second power generation copper electrode are respectively connected to the two interfaces spaced apart from each other on the rectifier bridge, the remaining two interfaces spaced apart from each other on the rectifier bridge are respectively connected to the output end and the input end of the energy storage capacitor, the low-power switch is connected in parallel with the energy storage capacitor, the low-power electronic device is connected in parallel with the energy storage capacitor, and the low-power switch is connected in series with the low-power electronic device.

[0026] In one embodiment, the receiving unit includes a copper coil and an acquisition card connected in series, the human-computer interaction module is a computer terminal with a Labview platform, and the acquisition card is electrically connected or signal-connected to the computer terminal;

[0027] The computer terminal is used to obtain a frequency domain waveform by FFT transformation of the time domain waveform sent by the acquisition card, and then use the deep learning algorithm to extract the different features of the time domain waveform and the frequency domain waveform to determine the target measurement parameters.

[0028] In one of the embodiments, a sliding bracket for supporting the rotation of the columnar drum is disposed on the top of the base, the sliding bracket is fixedly connected to the base, and the bottom of the columnar drum abuts against the sliding bracket.

[0029] In one embodiment, the first power generation copper electrode group and the second power generation copper electrode group are both provided with two power generation copper electrodes, and the thickness of the power generation copper electrodes is 50 μm;

[0030] The thickness of the FEP film jacket is 200 μm.

[0031] In one embodiment, the tip discharge structure includes a bottom plate and two triangular copper foils fixed on the bottom plate, wherein the tips of the two triangular copper foils are located on the same straight line and the distance between them is 0.5 mm;

[0032] The thickness of the triangular copper foil is 500 μm.

[0033] The beneficial effects of the present invention are:

[0034] (1) In the present invention, the wind energy in nature can be converted into electrical energy through the wind energy friction nanogenerator to power the entire system, without the need for external batteries, thus achieving self-powered sensing and reducing the maintenance cost of the system.

[0035] (2) The wind energy friction nanogenerator in the system of the present invention has two sets of electrodes. When the fixed drum rotates, the two sets of electrodes can respectively supply power to the wireless sensing module and the wired power supply module at the same time, thereby improving the utilization efficiency of the friction nanogenerator for wind energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of a triboelectric nanogenerator provided by an embodiment of the present invention;

[0037] Figure 2 Assembly relationship diagram of the FEP film sleeve and the support seat provided in the embodiment of the present invention

[0038] Figure 3 A diagram showing the assembly relationship between the first power generation copper electrode group and the second power generation copper electrode group and the fixing cylinder provided in an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of the structure of a wind energy rotating mechanism provided by an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of the circuit connection of the self-powered module, the wireless sensing module and the wired powered module provided in an embodiment of the present invention;

[0041] Figure 6 A frequency domain diagram of a wireless signal from an inductive sensor received by a receiving unit provided in an embodiment of the present invention;

[0042] Figure 7 A frequency domain diagram of a wireless signal from a capacitive sensor received by a receiving unit provided in an embodiment of the present invention;

[0043] Figure 8 A charging voltage curve diagram of the wind energy friction nanogenerator provided in an embodiment of the present invention for capacitors of different capacitance values ​​at a wind speed of 10.5 m / s.

[0044] Explanation of the reference numerals: 110, support base; 111, substrate; 112, fixing cylinder; 113, connector; 114, connecting hole; 115, wire hole; 121, wind energy rotating mechanism; 122, FEP film sleeve; 123, first power generation copper electrode group; 124, second power generation copper electrode group; 125, cylindrical drum; 126, copper foil; 127, wind arm; 128, wind cup; 200, transmitting resonant circuit; 300, tip discharge structure; 400, copper coil; 500, acquisition card; 600, energy storage capacitor; 700, rectifier bridge; 800, low power switch; 900, low power electronic device. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0046] It should be noted that in the description of the present invention, “upper”, “lower”, “top”, “bottom”, orientation or position relationship is based on the attached Figure 1 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In one embodiment, this embodiment provides a self-powered multifunctional wireless sensing system based on a wind energy friction nanogenerator, comprising:

[0048] The self-powered module is equipped with a wind-powered friction nanogenerator that can generate alternating current. The wind-powered friction nanogenerator is a wind-driven rotary switch friction nanogenerator (WRS-TENG), which can convert wind energy in nature into electrical energy to power the entire system without the need for external batteries, achieving self-powered sensing and reducing the maintenance cost of the system.

[0049] The wireless sensing module is electrically connected to the self-powered module and is used to wirelessly transmit and process the wireless signal carrying sensor-specific information generated by the alternating current generated by the wind-powered friction nanogenerator to generate target measurement parameters. The wireless signal carrying sensor-specific information may be a signal about ambient temperature, humidity, liquid level, etc.

[0050] The wired power supply module is electrically connected to the self-power supply module and is used to convert the alternating current generated by the wind energy friction nanogenerator into direct current for storage to power the low-power electronic device 900.

[0051] Specifically, the low-power electronic device 900 may be a thermometer, a hygrometer or the like.

[0052] like Figure 1 , Figure 2 and Figure 3 As shown, the wind energy friction nanogenerator includes a support base 110 and a friction power generation component fixedly assembled on the support base 110; the support base 110 is provided with a fixed cylinder 112, and the friction power generation component includes a wind energy rotating mechanism 121, a FEP film sleeve 122, a first power generation copper electrode group 123 and a second power generation copper electrode group 124, the first power generation copper electrode group 123 and the second power generation copper electrode group 124 are both fixedly attached to the outer side of the fixed cylinder 112, the first power generation copper electrode group 123 is arranged above the second power generation copper electrode group 124, the FEP film sleeve 122 is sleeved on the outer sides of the first power generation copper electrode group 123 and the second power generation copper electrode group 124, and the wind energy rotating mechanism 121 is slidably sleeved on the outer side of the FEP film sleeve 122.

[0053] Specifically, the first power generation copper electrode group 123 and the second power generation copper electrode group 124 are both provided with two power generation copper electrodes, and the thickness of the power generation copper electrodes is 50 μm; the FEP film sleeve 122 is the full name of polyperfluoroethylene propylene film, and its thickness is 200 μm.

[0054] like Figure 4 As shown, the wind energy rotating mechanism 121 is provided with a columnar rotating drum 125 for rotating relative to the fixed drum 112 under the action of wind energy. Two copper foils 126 are distributed vertically inside the columnar rotating drum 125 and fixedly attached to the inner wall of the columnar rotating drum 125 .

[0055] The wireless sensing module is electrically connected to the first power generation copper electrode group 123 , and the wired energy supply module is electrically connected to the second power generation copper electrode group 124 .

[0056] When the cylindrical drum 125 rotates, the copper foil 126 rubs against the FEP film sleeve 122 to generate friction charges, and generates current in the external circuits of the wireless sensor module and the wired power supply module through the first power generation copper electrode group 123 and the second power generation copper electrode group 124 respectively.

[0057] In this embodiment, the self-powered module and the wireless sensor module can simultaneously power the wireless unit and the wired unit, thereby improving the efficiency of the friction nanogenerator in utilizing wind energy.

[0058] In one embodiment, the support base 110 is also provided with a base plate 111 and a connector 113, a fixed cylinder 112 is fixedly connected to the top of the base plate 111, and the connector 113 is fixedly connected to the end of the fixed cylinder 112 away from the base plate 111; the base plate 111 is provided with a connection hole 114 that can be matched with the connector 113; the side wall of the fixed cylinder 112 is provided with at least one wire hole 115 for connecting the power generation copper electrode group with the wireless sensor module or the wired power supply module. Multiple wind energy friction nanogenerators can be integrated and assembled through the connector 113 and the connection hole 114.

[0059] Multiple groups of wind energy capture components are arranged on the outside of the cylindrical rotating drum 125; the wind energy capture components include a wind arm 127 and a hemispherical wind cup 128, one end of the wind arm 127 is fixedly connected to the cylindrical rotating drum 125, and the hemispherical wind cup 128 is fixedly connected to the other end of the wind arm 127; the opening of the wind cup 128 is perpendicular to the axis of the fixed cylinder 112.

[0060] In this embodiment, four groups of wind energy capturing components are specifically provided, the wind arms 127 of each wind energy capturing component are located on the same plane, and the opening directions of the multiple hemispherical wind cups 128 are all clockwise.

[0061] Specifically, the support seat 110 and the wind energy rotating mechanism 121 are both made of PLA, the diameter of the fixed cylinder 112 is 30 mm, and the diameter of the wire hole 115 is 2 mm. The overall height of the cylindrical rotating cylinder 125 is 78 mm, the diameter of the cylindrical rotating cylinder 125 is 41 mm, the diameter of the four hemispherical wind cups 128 is 42 mm, and the arm length of the wind cups 128 is 30 mm. The thickness of the power generation copper electrode is 50 μm and the size is 30×30 mm.

[0062] In one embodiment, a sliding bracket for supporting the rotation of the columnar drum 125 is disposed on the top of the base, the sliding bracket is fixedly connected to the base, and the bottom of the columnar drum 125 abuts against the sliding bracket.

[0063] The function of the sliding bracket is to assist the cylindrical drum 125 to rotate relative to the FEP film sleeve 122 under the action of wind force, thereby reducing the contact area between the cylindrical sleeve and the substrate 111 and reducing friction.

[0064] In one embodiment, the wireless sensing module includes a transmitting unit for transmitting wireless signals with different functions, a receiving unit for receiving wireless signals with different functions, and a human-computer interaction unit for acquiring and processing the wireless signals sent by the receiving unit to obtain target measurement parameters.

[0065] like Figure 5As shown, the transmitting unit includes a transmitting resonant circuit 200 and a tip discharge structure 300 . The transmitting resonant circuit 200 includes an equivalent resistor R0, a sensor unit and an equivalent inductor L0 connected in series in sequence. The wind energy friction nanogenerator and the tip discharge structure 300 are both connected in series to the transmitting resonant circuit 200 .

[0066] The sensor unit is an inductive sensor unit or a capacitive sensor unit with different functions. The inductive sensor unit includes an inductive sensor LS, and the capacitive sensor unit includes a capacitive sensor Cs and an inductive sensor LS having a fixed value connected in parallel with the capacitive sensor.

[0067] In the present invention, when the cylindrical drum 125 rotates under the action of wind power, the electric energy generated by the wind energy friction nanogenerator is instantly injected into the entire resonant circuit, and an extremely high voltage (3KV) is generated between the two triangular copper foils 126 electrodes placed opposite to each other in the tip discharge structure 300, which can break through the air near the tip and cause an electron avalanche effect, while emitting a wireless electromagnetic wave signal. At the same time, by configuring inductance sensors Ls and capacitance sensors Cs of different sizes in the transmitting resonant circuit 200, various parameters of the transmitted wireless signal will be affected. When the external measurement parameters change, the capacitance value or inductance value of the corresponding sensor also changes.

[0068] From the perspective of time domain, changing the size of the series inductor or parallel capacitor in the transmitting circuit may change the envelope shape and decay time of the time domain signal; from the perspective of frequency domain, it will change the resonant frequency of the frequency domain signal. Therefore, the basic principle of the present invention is: by connecting different capacitive sensors or inductive sensors in the transmitting unit circuit, when the external measurement parameters change, the corresponding capacitance value or inductance value of the sensor also changes. At the moment when the wind drives the wind energy friction nanogenerator to generate electricity, the transmitting unit is injected with electrical energy and transmits a wireless signal carrying specific information of the sensor through the cutting-edge power generation structure, which is finally captured by the receiving end and the signal is processed in the human-computer interaction unit to obtain the target measurement parameters.

[0069] Specifically, the tip discharge structure 300 in this embodiment includes a bottom plate and two triangular copper foils 126 fixed on the bottom plate. The tips of the two triangular copper foils 126 are located on the same straight line and the distance between them is 0.5 mm. The thickness of the triangular copper foils 126 is 500 μm.

[0070] In one embodiment, the receiving unit includes a copper coil 400 and an acquisition card 500 connected in series, the human-computer interaction module is a computer terminal with a Labview platform, and the acquisition card 500 is electrically connected or signal-connected to the computer terminal; the computer terminal is used to obtain a frequency domain waveform by FFT transformation of the time domain waveform sent by the acquisition card 500, and then use a deep learning algorithm to extract different features of the time domain waveform and the frequency domain waveform to determine the target measurement parameters.

[0071] In this embodiment, the inductance value of the copper coil 400 is 20μH and the diameter is 80mm. The inductor coil is placed vertically and both ends are connected to the acquisition card 500, and then the acquisition card 500 is connected to the Labview platform of the computer terminal to perform the next step of signal processing and human-machine interface display. When the wireless sensor signal from the transmitting unit is received by the inductor copper coil 400, the received time domain waveform can be displayed and saved on the experimental platform built by Labview.

[0072] It should be pointed out that the resonant circuit can replace different types of sensor units. When their own inductance or capacitance value changes with the change of the measured parameters, it is equivalent to the variable capacitor and variable inductor in the circuit. Therefore, when the wind drives the WRS-TENG, the corresponding sensing result can be obtained at the receiving end in combination with our transmitting unit, so as to realize wireless sensing power supply. For example, we can fix the resistance value of the inductor Ls to a fixed value, and sense the pressure by connecting a capacitive pressure sensor in parallel at both ends. When different pressures are applied to the sensor, the wind drives the WRS-TENG to wake up the entire wireless sensing system, and transmit a specific resonant electromagnetic wave signal and capture it by the receiving unit. At this time, the acquisition signal is set to a single trigger mode. Then, the time domain waveform data from the acquisition card 500 is acquired by the Labview platform on the computer, and its waveform in the frequency domain is obtained after FFT transformation. The obtained frequency domain waveform generally has two resonance peaks. Among them, the highest resonance peak is the self-oscillation frequency of the receiving coil, and the second peak is the resonance peak of the sensing signal from the transmitting end. When the parameters detected by the sensor at the transmitting end are different, the second peak will also be located at different positions. like Figure 6 and Figure 7 As shown in the figure, when the equivalent capacitance or equivalent inductance of the transmitting unit increases, the second peak of the frequency domain signal begins to shift toward a lower frequency and shows good discrimination. Finally, we use the deep learning algorithm to extract the positions of the different peaks of these pressure sensing signals, and we can accurately identify the pressure represented by the current signal.

[0073] Similarly, different parameters such as displacement, acceleration and thickness can also be measured by connecting different sensor units. In addition, the present invention can also measure wind speed. Since WRS-TENG will rotate continuously under the drive of wind force, the generated wireless electromagnetic signal will also be continuously emitted. When the wind speed increases, the number of rotations of WRS-TENG will increase, and the number of discharges of the transmitting unit will also increase. Therefore, we can set the acquisition card 500 to continuous trigger mode, so that the number of times the WRS-TENG receives the wireless signal at the receiving end under a specific rotation time can be recorded, and the wind speed at this time can be fitted by collecting multiple data and combining the Matlab platform. Further expansion, we can set the number of times the wireless signal is received on the computer side. When this threshold is reached, stop receiving the sensor signal, and analyze and identify the last signal to give the sensing result at this time, which is equivalent to adding a timing function to the original wireless sensing function.

[0074] In one embodiment, the wired energy supply module includes a rectifier bridge 700 formed by four identical diodes connected in series in the same direction and then closed, an energy storage capacitor 600, a low-power switch 800 and a low-power electronic device 900;

[0075] There is an interface between any two diodes of the rectifier bridge 700, the positive and negative poles of the second power generation copper electrode are respectively connected to the two interfaces spaced apart from each other on the rectifier bridge 700, the remaining two spaced apart interfaces of the rectifier bridge 700 are respectively connected to the output end and the input end of the energy storage capacitor 600, the low-power switch 800 is connected in parallel with the energy storage capacitor 600, the low-power electronic device 900 is connected in parallel with the energy storage capacitor 600, and the low-power switch 800 is connected in series with the low-power electronic device 900.

[0076] The function of the rectifier bridge 700 circuit is to convert the AC power output by the WRS-TENG into DC power. The function of the energy storage capacitor 600 is to collect the converted DC power. When the WRS-TENG is continuously rotated by the wind, the energy storage capacitor 600 is in a charging state, and the voltage across it continues to rise. After a period of charging, if the low-power switch 800 located on the low-power electronic device 900 in the circuit is turned on, the energy storage capacitor 600 is in a discharging state, and the voltage across it continues to drop. At the same time, the energy storage capacitor 600 starts to power the electronic device, completing the wired power supply function. Figure 8 As shown in the figure, the charging voltage curve of WRS-TENG for capacitors of different capacitance values ​​at a wind speed of 10.5 m / s is shown. It can be clearly seen that the smaller the capacitance, the faster the charging speed.

[0077] In this embodiment, the wired power supply performance of WRS-TENG is also tested. WRS-TENG can charge a 47μF energy storage capacitor 600 to 2V within 15 minutes while realizing the wireless sensing function, and successfully drive the thermometer and hygrometer without battery to work stably for 20 seconds after the switch is turned on. It should be noted that the thermometer and hygrometer can also be replaced with low-power devices such as LED arrays and alarm lights to meet actual application needs.

[0078] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator, characterized in that: include: A self-powered module, provided with a wind-powered friction nanogenerator capable of generating alternating current; A wireless sensing module, electrically connected to the self-powered module, for wirelessly transmitting a wireless signal carrying sensor-specific information generated by the alternating current generated by the wind-powered friction nanogenerator and processing the signal to generate target measurement parameters; A wired power supply module, electrically connected to the self-power supply module, for converting the alternating current generated by the wind energy friction nanogenerator into direct current for storage to power the low-power electronic device (900); The wind energy friction nanogenerator comprises a support seat (110) and a friction power generation component fixedly mounted on the support seat (110); The support seat (110) is provided with a fixing cylinder (112); the friction power generation assembly comprises a wind energy rotating mechanism (121), a FEP film sleeve (122), a first power generation copper electrode group (123) and a second power generation copper electrode group (124); the first power generation copper electrode group (123) and the second power generation copper electrode group (124) are both fixedly attached to the outside of the fixing cylinder (112); the first power generation copper electrode group (123) is arranged above the second power generation copper electrode group (124); the FEP film sleeve (122) is sleeved on the outside of the first power generation copper electrode group (123) and the second power generation copper electrode group (124); and the wind energy rotating mechanism (121) is slidably sleeved on the outside of the FEP film sleeve (122); The wind energy rotating mechanism (121) is provided with a columnar rotating drum (125) for rotating relative to the fixed drum (112) under the action of wind energy, and two copper foils (126) are arranged in an upper and lower distribution inside the columnar rotating drum (125), and the copper foils (126) are fixedly attached to the inner wall of the columnar rotating drum (125); The wireless sensing module is electrically connected to the first power generation copper electrode group (123), and the wired energy supply module is electrically connected to the second power generation copper electrode group (124).

2. The self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator according to claim 1 is characterized in that: The support seat (110) is further provided with a base plate (111) and a connecting piece (113); the fixing tube (112) is fixedly connected to the top of the base plate (111); and the connecting piece (113) is fixedly connected to an end of the fixing tube (112) away from the base plate (111); The base plate (111) is provided with a connection hole (114) that can be matched and installed with the connection piece (113); The side wall of the fixing cylinder (112) is provided with at least one wire hole (115) for connecting and threading the power generation copper electrode group with the wireless sensor module or the wired energy supply module.

3. The self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator according to claim 1 is characterized in that: A plurality of wind energy capture components are arranged on the outer side of the columnar rotating drum (125); The wind energy capture assembly comprises a wind arm (127) and a hemispherical wind cup (128), one end of the wind arm (127) is fixedly connected to the columnar drum (125), and the hemispherical wind cup (128) is fixedly connected to the other end of the wind arm (127); The opening of the wind cup (128) is oriented perpendicular to the axis of the fixing tube (112).

4. The self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator according to claim 1 is characterized in that: The wireless sensing module includes a transmitting unit for transmitting wireless signals with different functions, a receiving unit for receiving wireless signals with different functions, and a human-computer interaction unit for acquiring and processing the wireless signals sent by the receiving unit to obtain target measurement parameters; The transmitting unit comprises a transmitting resonant circuit (200) and a tip discharge structure (300), the transmitting resonant circuit (200) comprises an equivalent resistor R0, a sensor unit and an equivalent inductor L0 connected in series in sequence, and the wind energy friction nanogenerator and the tip discharge structure (300) are both connected in series to the transmitting resonant circuit (200); The sensor unit is an inductive sensor unit or a capacitive sensor unit with different functions. The inductive sensor unit includes an inductive sensor LS. The capacitive sensor unit includes a capacitive sensor Cs and an inductive sensor LS with a fixed value connected in parallel with the capacitive sensor.

5. The self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator according to claim 1 is characterized in that: The wired energy supply module comprises a rectifier bridge (700) formed by four identical diodes connected in series in the same direction and then closed, an energy storage capacitor (600), a low-power switch (800) and a low-power electronic device (900); There is an interface between any two diodes of the rectifier bridge (700); the positive and negative electrodes of the second power generation copper electrode are respectively connected to two interfaces of the rectifier bridge (700) that are spaced apart from each other; the remaining two interfaces of the rectifier bridge (700) are respectively connected to the output end and the input end of the energy storage capacitor (600); the low-power switch (800) is connected in parallel with the energy storage capacitor (600); the low-power electronic device (900) is connected in parallel with the energy storage capacitor (600); and the low-power switch (800) is connected in series with the low-power electronic device (900).

6. The self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator according to claim 4 is characterized in that: The receiving unit comprises a copper coil (400) and an acquisition card (500) connected in series, the human-computer interaction module is a computer terminal with a Labview platform, and the acquisition card (500) is electrically connected or signal-connected to the computer terminal; The computer terminal is used to obtain a frequency domain waveform by performing FFT transformation on the time domain waveform sent by the acquisition card (500), and then use a deep learning algorithm to extract different features of the time domain waveform and the frequency domain waveform to determine the target measurement parameter.

7. The self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator according to any one of claims 2 to 6, characterized in that: A sliding bracket for supporting the rotation of the columnar rotating drum (125) is arranged on the top of the base, the sliding bracket is fixedly connected to the base, and the bottom of the columnar rotating drum (125) abuts against the sliding bracket.

8. The self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator according to claim 7 is characterized in that: The first power generation copper electrode group (123) and the second power generation copper electrode group (124) are both provided with two power generation copper electrodes, and the thickness of the power generation copper electrodes is 50 μm; The thickness of the FEP film jacket layer (122) is 200 μm.

9. The self-powered multifunctional wireless sensing system based on wind energy friction nanogenerator according to claim 8 is characterized in that: The tip discharge structure (300) comprises a bottom plate and two triangular copper foils (126) fixed on the bottom plate, wherein the tips of the two triangular copper foils (126) are located on the same straight line and the distance between them is 0.5 mm; The thickness of the triangular copper foil (126) is 500 μm.

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