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

Abstract

The invention discloses a self-powered multifunctional wireless sensing system based on a friction nano-generator. A self-powered rotary switch friction nano-generator comprises a supporting seat and a friction power generation assembly; the supporting seat is provided with a substrate, a fixed cylinder and a connecting piece, the substrate is provided with a connecting hole, and the plurality of rotary switch friction nano generators of the plurality of self-energized modules are integrally assembled through the connecting hole and the connecting piece. The friction power generation assembly comprises a rotating mechanism, an FEP film sleeve layer and two power generation copper electrodes, the FEP film sleeve layer is connected to the outer side of the fixed cylinder in a sleeving mode, the two power generation copper electrodes are attached and fixed to the outer side, close to the base plate, of the fixed cylinder, and the rotating mechanism is connected to the FEP film sleeve layer in a sliding and sleeving mode; the rotating mechanism is provided with a rotating body, and a foam layer and a copper foil layer are arranged in the rotating body. According to the invention, the columnar friction nanometer generator occupies a small horizontal position, the expandability in a limited space is high, any two columnar friction nanometer generators can be spliced, and the integration level of the friction nanometer generator set is high.

Description

Technical Field

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

[0002] With the expansion of human activities, transportation infrastructure such as bridges and roads have penetrated into natural environments such as mountains and rivers, which has put forward new requirements for establishing a continuous, comprehensive and wireless environmental detection system. At present, based on the rapid development of the Internet of Things (IoT), building wireless sensor networks by deploying a large number of distributed sensor nodes has become a mainstream solution and has been widely used in many fields such as environmental monitoring, smart cities and medical care. Usually, distributed sensors are widely placed in different areas to meet their specific detection needs, and only need to complete the detection tasks of specific functions.

[0003] However, most of the current wireless sensor networks are powered directly 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 battery maintenance and replacement.

[0004] 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.

[0005] However, existing wireless sensing systems based on friction nanogenerators usually only use a single flat-plate friction nanogenerator for self-powering. The flat structure increases the horizontal space occupied by the friction nanogenerator under the same conditions. In addition, the friction nanogenerator combined with the resonant circuit can only achieve a single specific function, such as the combination of the friction nanogenerator and the temperature sensor to achieve temperature measurement at the deployment location of the temperature sensor. If other functions need to be added to the entire system, it is necessary to add a flat-plate friction nanogenerator for self-powering. In the multifunctional wireless sensing system, the integration of all friction nanogenerators is low, and the flat-plate friction nanogenerator is difficult to expand within the limited deployment space. Summary of the invention

[0006] Based on this, it is necessary to provide a self-powered multifunctional wireless sensing system based on friction nanogenerators to address the above-mentioned technical problems. The system can be self-powered through columnar friction nanogenerators. The columnar friction nanogenerators occupy a small horizontal position and have high scalability in a limited space. Any two columnar friction nanogenerators can be spliced ​​together, and the friction nanogenerator group has a high degree of integration.

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

[0008] A plurality of self-powered modules, each of which is provided with a rotary switch friction nanogenerator;

[0009] A plurality of transmitting modules for transmitting wireless signals with different functions, the number of which is equal to the number of the self-powered modules, and the transmitting modules are electrically connected to the self-powered modules;

[0010] A receiving module, used to receive wireless signals transmitted by multiple transmitting modules, and the receiving module is signal-connected to the transmitting module;

[0011] A signal processing module, used for receiving and processing wireless signals to obtain target measurement parameters, the signal processing module being signal-connected or electrically connected to the receiving module;

[0012] The rotary switch friction nanogenerator includes a support seat and a friction power generation component fixedly assembled on the support seat;

[0013] The support seat is provided with a base plate, a fixing tube and a connecting piece, wherein the fixing tube is fixedly connected to one side of the base plate, and the connecting piece is fixedly connected to an end of the fixing tube away from the base plate;

[0014] The substrate is provided with a connection hole that can be matched with the connection piece for installation, and the multiple rotary switch friction nanogenerators of the multiple self-powered modules are integrated and assembled through the connection hole and the connection piece;

[0015] The friction power generation component includes a rotating mechanism, a FEP film sleeve and two power generation copper electrodes. The FEP film sleeve is sleeved on the outside of the fixed cylinder. The two power generation copper electrodes are both fitted and fixed on the outside of the fixed cylinder close to the substrate. The rotating mechanism is slidably sleeved on the FEP film sleeve.

[0016] The rotating mechanism is provided with a rotating body and a handle. The rotating body is a cylindrical structure with an opening on the side. The handle is fixedly connected to the outer side opposite to the opening of the rotating body. A foam layer and a copper foil layer are provided inside the rotating body. The foam layer is bonded and fixed to the rotating body, and the copper foil layer is bonded and fixed to the side of the foam layer away from the rotating body.

[0017] In one of the embodiments, the transmitting module includes a transmitting resonant circuit and a tip structure;

[0018] The transmitting resonant circuit includes an equivalent resistor R0, a sensor unit and an equivalent inductor L0 connected in series in sequence, and the rotary switch friction nanogenerator and the tip structure are both connected in series to the transmitting resonant circuit;

[0019] The sensor unit is an inductive sensor unit or a capacitive sensor unit with different functions. The inductive sensor unit includes an inductive sensor L S The capacitive sensor unit includes a capacitive sensor Cs and an inductive sensor L having a fixed value connected in parallel with the capacitive sensor. S .

[0020] In one embodiment, the tip structure includes a base plate and two triangular copper foils fixed on the base 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;

[0021] The thickness of the triangular copper foil is 500 μm.

[0022] In one embodiment, the receiving module includes a copper coil and an oscilloscope connected in series, the signal processing module is a computer terminal, and the oscilloscope is electrically connected or signal-connected to the computer terminal;

[0023] The computer terminal is used to obtain a frequency domain waveform by FFT transformation of the time domain waveform sent by the oscilloscope, 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.

[0024] In one embodiment, two wire holes are symmetrically arranged along the axis at one end of the fixing tube close to the substrate, for threading the two power generation copper electrodes with the equivalent inductance and the equivalent resistance respectively.

[0025] In one embodiment, the thickness of the power generation copper electrode is 50 μm, the thickness of the FEP film jacket is 200 μm, and the thickness of the foam layer is 300 μm.

[0026] In one of the embodiments, a sealing plate is also provided, and the sealing plate is provided with a groove. After a plurality of rotary switch friction nanogenerators are integrated and assembled into a rotary switch friction nanogenerator group, the sealing plate is fixedly assembled on the exposed connection of the rotary switch friction nanogenerator group.

[0027] In one embodiment, the copper coil has an inductance of 20 μH and a diameter of 80 mm.

[0028] Beneficial effects of the present invention:

[0029] (1) The self-powered multifunctional wireless sensing system based on the friction nanogenerator of the present invention adopts the friction nanogenerator for self-powering, does not require batteries, and reduces the maintenance cost of the system.

[0030] (2) The friction nanogenerator of the present invention has a columnar structure, which occupies a small horizontal position and has high scalability within a limited space.

[0031] (3) Any two columnar friction nanogenerators in the present invention can be spliced ​​together through the connecting piece and the connecting hole, so that two adjacent columnar friction nanogenerators can be spliced ​​together, and the friction nanogenerator group has a high degree of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the framework structure of a self-powered multifunctional wireless sensing system based on a friction nanogenerator provided in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the structure of a triboelectric nanogenerator provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the assembly relationship between the rotating mechanism and the FEP film sleeve provided in an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of the structure of a support base provided by an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the structure of a friction nanogenerator set composed of two components provided in an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of a circuit structure in which two transmitting modules share one receiving module;

[0038] Figure 7 A typical time domain waveform diagram received by an oscilloscope provided in an embodiment of the present invention;

[0039] Figure 8 A frequency domain diagram of a wireless signal from an inductive sensor received by a receiving module provided in an embodiment of the present invention;

[0040] Fig. 9 A frequency domain diagram of a wireless signal from a capacitive sensor received by a receiving module provided in an embodiment of the present invention.

[0041] Explanation of the reference numerals: 100, rotary switch friction nanogenerator; 110, support base; 111, substrate; 112, fixing cylinder; 113, connector; 114, connecting hole; 115, wire hole; 121, rotating mechanism; 122, FEP film sleeve; 123, power generation copper electrode; 124, rotating body; 125, handle; 126, foam layer; 127, copper foil layer; 200, transmitting resonant circuit; 300, tip structure; 400, copper coil; 500, oscilloscope; 600, sealing plate. DETAILED DESCRIPTION

[0042] 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.

[0043] 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 2 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.

[0044] In one embodiment, Figure 1 As shown, the self-powered multifunctional wireless sensing system based on the friction nanogenerator of this embodiment includes:

[0045] A plurality of self-powered modules, each of which is provided with a rotary switch friction nanogenerator 100; a plurality of transmitting modules equal in number to the self-powered modules for transmitting wireless signals with different functions, the transmitting modules being electrically connected to the self-powered modules; a receiving module for receiving wireless signals transmitted by the plurality of transmitting modules, the receiving module being signal-connected to the transmitting module; a signal processing module for receiving and processing wireless signals to obtain target measurement parameters, the signal processing module being signal-connected or electrically connected to the receiving module.

[0046] Specifically, the multiple transmitting modules in this embodiment may share one receiving module. The wireless signals with different functions may be signals about the ambient temperature, humidity, liquid level and the like.

[0047] Among them, Figure 2 and Figure 3 As shown, the rotary switch friction nanogenerator 100 includes a support base 110 and a friction power generation component fixedly assembled on the support base 110. Figure 4 As shown, the support seat 110 is provided with a base plate 111 , a fixing tube 112 and a connecting member 113 . The fixing tube 112 is fixedly connected to one side of the base plate 111 , and the connecting member 113 is fixedly connected to an end of the fixing tube 112 away from the base plate 111 .

[0048] In this embodiment, the diameter of the fixing tube 112 is 30 mm.

[0049] The substrate 111 is provided with a connection hole 114 that can be matched with the connector 113 , and the multiple rotary switch friction nanogenerators 100 of the multiple self-powered modules are integrated and assembled through the connection hole 114 and the connector 113 .

[0050] In this embodiment, the connecting member 113 is a cylindrical structure with a diameter smaller than that of the fixed cylinder 112. A plurality of rotary switch friction nanogenerators 100 can be fixedly assembled into an integral unit through the connecting member 113 and the connecting hole 114, thereby increasing the integration degree of the rotary switch friction nanogenerator 100 and further increasing the functional integration of the wireless sensing system.

[0051] The friction power generation component includes a rotating mechanism 121, a FEP film sleeve 122 and two power generation copper electrodes 123. The FEP film sleeve 122 is sleeved on the outside of the fixed cylinder 112. The two power generation copper electrodes 123 are both attached and fixed to the outside of the fixed cylinder 112 close to the substrate 111. The rotating mechanism 121 is slidably sleeved on the FEP film sleeve 122.

[0052] The rotating mechanism 121 is provided with a rotating body 124 and a handle 125. The rotating body 124 is a cylindrical structure with an opening on the side. The handle 125 is fixedly connected to the outer side of the rotating body 124 opposite to the opening. A foam layer 126 and a copper foil layer 127 are provided inside the rotating body 124. The foam layer 126 is adhered and fixed to the rotating body 124, and the copper foil layer 127 is adhered and fixed to the side of the foam layer 126 away from the rotating body 124.

[0053] The end of the fixing tube 112 close to the substrate 111 is symmetrically provided with two wire holes 115 along the axis, which are used to thread the two power generation copper electrodes 123 with the equivalent inductance and equivalent resistance respectively. Specifically, the diameter of the wire hole 115 is 2 mm.

[0054] In this embodiment, the fixed cylinder 112 and the rotating body 124 are cylindrical, and the entire generator is columnar, which saves plane space and has high scalability in a limited space, thereby realizing the integration of rotary switch friction nanogenerators 100 for different functions.

[0055] Specifically, the diameter of the rotating body 124 is 33 mm. The foam layer 126 is made of black foam and serves as a buffer. The thickness of the power generation copper electrode 123 is 50 μm, the thickness of the FEP film jacket 122 is 200 μm, and the thickness of the foam layer 126 is 300 μm.

[0056] The base plate 111 , the fixing tube 112 , the connecting piece 113 , the rotating body 124 and the handle 125 are all made of PLA, and each structure can be prepared by 3D printing.

[0057] When the rotating body 124 is rotated by the handle 125 , the copper foil layer 127 and the FEP film jacket layer 122 rub against each other and generate friction charges, which in turn generate current in an external circuit via the power generation copper electrode 123 and the wire.

[0058] In one of the embodiments, the wireless sensing system of this embodiment is also provided with a sealing plate 600, which is provided with a groove. After a plurality of rotary switch friction nanogenerators 100 are integrated into a rotary switch friction nanogenerator 100 group, the sealing plate 600 is fixedly assembled on the exposed connection of the rotary switch friction nanogenerator 100 group.

[0059] The structural schematic diagram of the rotary switch friction nanogenerator 100 group in which two rotary switch friction nanogenerators 100 are integrated is shown in FIG. Figure 5 shown.

[0060] In one embodiment, if Figure 6 As shown, Figure 6 This is a schematic diagram of a circuit structure in which two transmitting modules share one receiving module. The transmitting module includes a transmitting resonant circuit 200 and a tip 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, and the rotary switch friction nanogenerator 100 and the tip structure 300 are both connected in series to the transmitting resonant circuit 200.

[0061] 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.

[0062] In one embodiment, the tip structure 300 includes a base plate and two triangular copper foils fixed on the base plate, the tips of the two triangular copper foils are located on the same straight line and the distance between them is 0.5 mm; the thickness of the triangular copper foils is 500 μm.

[0063] Specifically, the bottom plate is a 2 mm thick PVC plate.

[0064] In one embodiment, the receiving module includes a copper coil 400 and an oscilloscope 500 connected in series, the signal processing module is a computer terminal, and the oscilloscope 500 is electrically connected or signal-connected to the computer terminal; the inductance of the copper coil 400 is 20 μH and the diameter is 80 mm.

[0065] The computer terminal is used to obtain a frequency domain waveform by performing FFT transformation on the time domain waveform sent by the oscilloscope 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.

[0066] In this embodiment, the oscilloscope 500 needs to be set to a trigger mode. When the wireless sensor signal from the transmitting module is received by the copper coil 400, the received time domain waveform will be displayed on the oscilloscope 500. The typical time domain waveform received by the oscilloscope 500 is as follows: Figure 7 As shown,

[0067] In the present invention, the sensors of the two transmitting modules are inductive sensor units or capacitive sensor units. When the rotating body 124 is rotated by the handle 125, the electric energy generated by the rotary switch friction nanogenerator 100 is instantly injected into the entire resonant circuit, and an extremely high voltage (3KV) is generated between the two triangular copper foil electrodes placed opposite to each other in the tip 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 inductive sensors Ls and capacitive sensors Cs of different sizes in the transmitting resonant circuit 200, various parameters of the transmitted wireless signal will be affected. From the time domain point of view, changing the size of the series inductance or parallel capacitance in the transmitting end circuit may change the envelope shape and decay time of the time domain signal; from the frequency domain point of view, 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 end circuit, when the external measurement parameters change, the capacitance value or inductance value of the corresponding sensor also changes. At the moment of manually turning the rotary switch friction nanogenerator 100, the transmitting module is injected with electric energy and transmits a wireless signal carrying sensor-specific information through the tip structure 300, which is eventually captured by the receiving end and processed by the computer terminal to obtain the target measurement parameters.

[0068] When the computer terminal of the present invention performs signal processing, the time domain waveform from the oscilloscope 500 is acquired by 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 copper coil 400, and the second peak is the resonance peak of the sensor signal from the transmitting module. When the parameters detected by the sensor of the transmitting module are different, the second peak will also be located at different positions. In other words, different sensor signals can be characterized by distinguishing the different positions of these peaks. After the transmitting module is connected to the inductive sensor and the capacitive sensor, the frequency domain diagram of the wireless signal received by the receiving module from the inductive sensor is as shown in the figure. Figure 8 , frequency domain plot of wireless signal from capacitive sensor Fig. 9As shown in the figure, when the value of capacitance or inductance increases, the second peak of the frequency domain signal begins to shift toward a lower frequency and shows good discrimination. Therefore, the different features of these different signals in the time domain and frequency domain can be comprehensively extracted by combining the deep learning algorithm, so as to identify the parameters that the sensor currently needs to measure, thereby determining different target measurement parameters. For example, when the connected sensor is a capacitive strain gauge, the capacitance change of the strain gauge attached to the bridge under different deformations can be used to detect whether the key components of the bridge have deformed, providing a reference for maintenance personnel to determine whether further inspection is required; when the connected sensor is an inductive weight sensor, the sensor can be deployed at the foot of the mountain to detect early rockfall. When the sensor detects a heavy object, the inductance will change, causing a difference in the received signal, so that a risk warning of rockfall can be issued in time. In addition, the function can be expanded by connecting more sensors to further measure more environmental parameter information such as ambient temperature, humidity, and liquid level.

[0069] 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 a friction nanogenerator, characterized in that: include: A plurality of self-powered modules, each of which is provided with a rotary switch friction nanogenerator (100); A plurality of transmitting modules for transmitting wireless signals with different functions, the number of which is equal to that of the self-powered modules, and the transmitting modules are electrically connected to the self-powered modules; A receiving module, used to receive wireless signals transmitted by multiple transmitting modules, the receiving module being signal-connected to the transmitting modules; A signal processing module, used for receiving and processing the wireless signal to obtain a target measurement parameter, the signal processing module being signal-connected or electrically connected to the receiving module; Wherein, the rotary switch friction nanogenerator (100) 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 base plate (111), a fixing tube (112) and a connecting piece (113), wherein the fixing tube (112) is fixedly connected to one side 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 substrate (111) is provided with a connection hole (114) that can be matched and installed with the connection piece (113); and a plurality of rotary switch friction nanogenerators (100) of a plurality of self-powered modules are integrated and assembled through the connection hole (114) and the connection piece (113); The friction power generation component comprises a rotating mechanism (121), a FEP film sleeve (122) and two power generation copper electrodes (123); the FEP film sleeve (122) is sleeved on the outside of the fixed cylinder (112); the two power generation copper electrodes (123) are both fitted and fixed on the outside of the fixed cylinder (112) close to the substrate (111); and the rotating mechanism (121) is slidably sleeved on the FEP film sleeve (122); The rotating mechanism (121) is provided with a rotating body (124) and a handle (125); the rotating body (124) is a cylindrical structure with an opening on the side; the handle (125) is fixedly connected to the outer side of the rotating body (124) opposite to the opening; a foam layer (126) and a copper foil layer (127) are provided inside the rotating body (124); the foam layer (126) is fixedly attached to the rotating body (124); and the copper foil layer (127) is fixedly attached to the side of the foam layer (126) away from the rotating body (124).

2. A self-powered multifunctional wireless sensing system based on a friction nanogenerator according to claim 1, characterized in that: The transmitting module comprises a transmitting resonant circuit (200) and a tip 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 rotary switch friction nanogenerator (100) and the tip 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.

3. A self-powered multifunctional wireless sensing system based on a friction nanogenerator according to claim 2, characterized in that: The tip structure (300) comprises a base plate and two triangular copper foils fixed on the base 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; The thickness of the triangular copper foil is 500 μm.

4. The self-powered multifunctional wireless sensing system based on a friction nanogenerator according to claim 3 is characterized in that: The receiving module comprises a copper coil (400) and an oscilloscope (500) connected in series, the signal processing module is a computer terminal, and the oscilloscope (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 oscilloscope (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.

5. The self-powered multifunctional wireless sensing system based on a friction nanogenerator according to claim 4 is characterized in that: Two wire holes (115) are symmetrically arranged along the axis at one end of the fixing cylinder (112) close to the substrate (111) for threading two power generation copper electrodes (123) with the connection wires of the equivalent inductance and the equivalent resistance respectively.

6. The self-powered multifunctional wireless sensing system based on a friction nanogenerator according to claim 5, characterized in that: The thickness of the power generation copper electrode (123) is 50 μm, the thickness of the FEP film jacket layer (122) is 200 μm, and the thickness of the foam layer (126) is 300 μm.

7. The self-powered multifunctional wireless sensing system based on a friction nanogenerator according to claim 6, characterized in that: A sealing plate (600) is also provided, wherein the sealing plate (600) is provided with a groove, and after a plurality of rotary switch friction nanogenerators (100) are integrated and assembled into a rotary switch friction nanogenerator (100) group, the sealing plate (600) is fixedly assembled on the exposed connection of the rotary switch friction nanogenerator (100) group.

8. The self-powered multifunctional wireless sensing system based on a friction nanogenerator according to claim 4 is characterized in that: The copper coil (400) has an inductance of 20 μH and a diameter of 80 mm.

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