Liquid flow monitoring device based on friction nanopower generation

Abstract

The present application relates to a liquid flow monitoring device based on friction nano-power generation, including a device housing, a driving element, a sensor unit and a sealing assembly; the device housing has a detection channel for the flow of the liquid to be measured, and the device housing is provided with a mounting port connected to the middle of the detection channel; the sealing assembly is detachably mounted in the mounting port, and the sealing assembly has a sealed mounting cavity; the sensor unit includes a friction nano-power generation assembly and a magnetic transmission component, the friction nano-power generation assembly includes a stator and a rotor, the rotor and the magnetic transmission component are coaxially mounted in the mounting cavity and the rotation axis is perpendicular to the detection channel, the magnetic transmission component can drive the rotor to rotate when rotating, and the stator is fixedly mounted in the mounting cavity and is on the side of the rotor away from the detection channel. The liquid flow monitoring device provided by the present invention has the advantages of high liquid flow detection accuracy and sensitivity, and solves the problem of low detection accuracy and sensitivity in traditional liquid flow monitoring devices.

Description

Technical Field

[0001] The present application relates to the field of hydropower generation, and in particular to a liquid flow monitoring device based on friction nanopower generation. Background Art

[0002] Flow monitoring plays a vital role in water conservancy projects in the fields of agriculture and environmental protection, and is mainly used to monitor liquid flow. For example, in agricultural irrigation, accurate flow monitoring can achieve the rational allocation and utilization of water resources and improve irrigation efficiency; in environmental monitoring, flow monitoring can be used in water resource management, pollutant emission control, etc. At the same time, in industrial processes, flow monitoring is a key link to ensure product quality and improve production efficiency.

[0003] Traditional flow monitoring technologies mainly include mechanical, ultrasonic, electromagnetic, etc. However, these technologies have some limitations that are difficult to overcome, such as mechanical flow meters are prone to wear, low accuracy, and high maintenance costs; ultrasonic flow meters are easily disturbed by factors such as bubbles and solid particles, and their measurement accuracy is limited.

[0004] With regard to the problems of low detection accuracy and sensitivity of traditional liquid flow monitoring devices, no effective solution has been proposed so far. Summary of the invention

[0005] The present invention provides a liquid flow monitoring device based on friction nanopower generation to solve the problems of low detection accuracy and sensitivity of traditional liquid flow monitoring devices.

[0006] In a first aspect, the present invention provides a liquid flow monitoring device based on friction nano-power generation, wherein the liquid flow monitoring device comprises a device housing, a driving element, a sensor unit and a sealing assembly;

[0007] The device housing has a detection channel for the flow of the liquid to be detected, and the device housing is provided with a mounting port connected to the middle of the detection channel;

[0008] The sealing assembly is detachably mounted in the mounting opening, and a sealed mounting cavity is provided in the sealing assembly;

[0009] The sensing unit includes a friction nano power generation component and a magnetic transmission component, the friction nano power generation component includes a stator and a rotor, the rotor and the magnetic transmission component are coaxially rotatably installed in the installation cavity and the rotation axis is perpendicular to the detection channel, the magnetic transmission component can drive the rotor to rotate when rotating, and the stator is fixedly installed in the installation cavity and is located on the side of the rotor away from the detection channel;

[0010] The driving element includes a water wheel group and a transmission magnet. The water wheel group is rotated and installed in the middle of the detection channel and is coaxial with the magnetic transmission component. The transmission magnet is fixedly installed at one end of the water wheel group close to the installation port. When the transmission magnet rotates, it can drive the magnetic transmission component to rotate synchronously through magnetic attraction.

[0011] Compared with the related art, the liquid flow monitoring device based on friction nano power generation provided in the present invention converts the kinetic energy of liquid flow into electrical energy through the friction nano power generation component, so that the user can judge the size of the liquid flow according to the size of the electrical signal. The friction nano power generation component has the characteristics of high sensitivity, which can accurately convert mechanical energy into electrical energy, and the electrical signal it outputs can accurately change with the liquid flow rate. Therefore, the liquid flow monitoring device provided by the present invention has the advantages of high liquid flow detection accuracy and sensitivity, which solves the problem of low detection accuracy and sensitivity of traditional liquid flow monitoring devices.

[0012] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a structural diagram of a liquid flow monitoring device based on friction nano-power generation in one embodiment of the present invention;

[0014] Figure 2 is a structural diagram of a device housing of a liquid flow monitoring device based on friction nano-power generation in one embodiment of the present invention;

[0015] Figure 3 is a structural diagram of a driving element of a liquid flow monitoring device based on friction nano-power generation in one embodiment of the present invention;

[0016] Figure 4 is a cross-sectional view of a bionic water wheel of a liquid flow monitoring device based on friction nano-power generation in one embodiment of the present invention;

[0017] Figure 5 is a structural diagram of a sensor unit of a liquid flow monitoring device based on friction nano-power generation in one embodiment of the present invention;

[0018] Figure 6 is a structural diagram of a stator of a liquid flow monitoring device based on friction nano-power generation in one embodiment of the present invention;

[0019] Figure 7 is an assembly structure diagram of a sealing component of a liquid flow monitoring device based on friction nano-power generation in one embodiment of the present invention;

[0020] Figure 8is a disassembled structural diagram of a sensor unit of a liquid flow monitoring device based on friction nano-power generation in one embodiment of the present invention;

[0021] Fig. 9 It is a structural diagram of a common-mode interference suppression circuit of a liquid flow monitoring device based on friction nanopower generation in one embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0023] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the", "these" and the like in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. Usually, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0024] The present invention provides a liquid flow monitoring device for tribo-nanoelectric power generation. Figure 1 It is a structural diagram of a liquid flow monitoring device for friction nanopower generation provided in an embodiment of the present invention.

[0025] like Figure 1As shown, the liquid flow monitoring device includes a device housing 1, a driving element 2, a sensor unit 3 and a sealing component 4; the device housing 1 has a detection channel for the flow of the liquid to be detected, and the device housing 1 is provided with a mounting port connected to the middle of the detection channel; the sealing component 4 is detachably mounted in the mounting port, and the sealing component 4 has a sealed mounting cavity; the sensor unit 3 includes a friction nano-power generation component and a magnetic transmission component 3-4, the friction nano-power generation component includes a stator 3-2 and a rotor 3-3, and the rotor 3-3 and the magnetic transmission component 3-4 rotate coaxially The rotor 3-3 is rotatably installed in the installation cavity and its rotation axis is perpendicular to the detection channel. The magnetic transmission component 3-4 can drive the rotor 3-3 to rotate when it rotates. The stator 3-2 is fixedly installed in the installation cavity and is located on the side of the rotor 3-3 away from the detection channel; the driving element 2 includes a water wheel group and a transmission magnet 2-2. The water wheel group is rotatably installed in the middle of the detection channel and is coaxial with the magnetic transmission component 3-4. The transmission magnet 2-2 is fixedly installed at one end of the water wheel group close to the installation port. When the transmission magnet 2-2 rotates, it can drive the magnetic transmission component 3-4 to rotate synchronously through magnetic attraction.

[0026] When the device is in use, the liquid flows through the detection channel, the liquid flow drives the water wheel group to rotate, the water wheel group synchronously drives the transmission magnet 2-2 to rotate coaxially, and the transmission magnet drives the magnetic transmission part 3-4 to rotate synchronously through the magnetic force, and the magnetic transmission part 3-4 drives the rotor 3-3 to rotate, so that the rotor 3-3 rotates relative to the stator 3-2, that is, the friction nano power generation component operates to generate electricity. Among them, the sealing component 4 can provide a sealed installation space for the sensor unit 3 to prevent the liquid from contacting the friction nano power generation component in the sensor unit 3. Triboelectric nanogenerator (TENG) has received widespread attention as a new type of energy collection and self-powered sensing technology. TENG is based on the principles of friction electrification and electrostatic induction, and can convert mechanical energy into electrical energy and output electrical signals related to mechanical stimulation. Compared with traditional technologies, TENG has the advantages of high sensitivity, simple structure and low cost. In the present invention, the kinetic energy of liquid flow is converted into electrical energy through the friction nano power generation component, so that the user can judge the size of the liquid flow according to the size of the electrical signal. The friction nano power generation component has the characteristics of high sensitivity and can accurately convert mechanical energy into electrical energy. The output electrical signal can accurately change with the liquid flow rate. Therefore, the liquid flow monitoring device provided by the present invention has the advantages of high liquid flow detection accuracy and sensitivity, which solves the problem of low detection accuracy and sensitivity of traditional liquid flow monitoring devices.

[0027] In some embodiments, the device housing 1 includes a main housing 1-2 and a pipe joint 1-1; the main housing 1-2 is used to provide a detection channel, the mounting port is set on the main housing 1-2, and there are two pipe joints 1-1 and they are respectively installed at both ends of the detection channel. By using the pipe joint 1-1, the detection channel can be connected to the liquid pipeline.

[0028] In some embodiments based on this, the sealing assembly 4 includes a sealing shell 4-2 with an opening on one side, a first sealing gasket ring 4-3, a second sealing gasket ring 4-1, a glass plate 1-5 and a fixing cover 1-6; the top of the inner wall of the installation opening is provided with an annular stepped groove, the top of the outer wall of the sealing shell 4-2 is provided with an annular protrusion matching the stepped groove, and the annular protrusion contacts the stepped groove through the first sealing gasket ring 4-3; the inner wall of the opening top of the sealing shell 4-2 is provided with an annular sealing gasket groove 4-2-1, the glass plate 1-5 The edge of the sealing shell 4-2 is in contact with the sealing gasket groove 4-2-1 through the second sealing gasket 4-1; the fixed cover 1-6 is installed at the installation port through a threaded connection and a viewing port facing the glass plate 1-5 is provided in the middle; the fixed cover 1-6 cooperates with the step groove to clamp and fix the sealing shell 4-2, so as to fix the sealing shell 4-2 in the installation port; and the fixed cover 1-6 cooperates with the sealing gasket groove 4-2-1 to clamp and fix the glass plate 1-5, so as to fix the glass plate 1-5 in the opening of the sealing shell 4-2. In this embodiment, a detachable structure of the sealing assembly 4 is provided, wherein the first sealing gasket ring 4-3 is used to achieve a sealed contact between the sealing shell 4-2 and the main shell 1-2, and the second sealing gasket ring 4-1 is used to achieve a sealed contact between the glass plate 1-5 and the sealing shell 4-2, so that a sealed space is formed between the glass plate 1-5 and the sealing shell 4-2, and the sensor unit 3 is arranged in the sealed space. The top of the fixing cover 1-6 contacts the glass plate 1-5. When the fixing cover 1-6 moves toward the side close to the main shell 1-2 by rotating, it will apply a certain force to the glass plate 1-5, thereby fixing the glass plate 1-5 in the sealing gasket groove 4-2-1. At the same time, the force will be transmitted to the sealing shell 4-2, thereby fixing the sealing shell 4-2 in the step groove, and then installing the sealing assembly 4 in the installation port.

[0029] Furthermore, a positioning groove is provided on the inner wall of the installation opening, and a positioning protrusion 4-2-5 matching with the positioning groove is provided on the outer wall of the sealing shell 4-2; the device housing 1 also includes a dust cover 1-4, one side of the dust cover 1-4 is rotatably connected to the main shell 1-2 and can completely cover the installation opening by rotation. Through the cooperation of the positioning protrusion 4-2-5 and the positioning groove, the position of the sealing shell 4-2 in the installation opening can be better positioned. And by providing the dust cover 1-4, dust can be prevented from adhering to the glass plate 1-5.

[0030] In some of the embodiments, the device housing 1 further includes a circuit protection shell 1-3, which is mounted on the main housing 1-2; a back-end circuit module 5 is mounted in the circuit protection shell 1-3, and the back-end circuit module 5 includes a common-mode interference suppression circuit, and the input end of the common-mode interference suppression circuit is connected to the friction nano-power generation component and is used to process the electrical signal generated by the friction nano-power generation component. The common-mode interference suppression circuit can eliminate the common-mode interference in the electrical signal and expand the signal amplitude, thereby effectively improving the monitoring stability of the liquid flow monitoring device.

[0031] In some embodiments based on this, the stator 3-2 includes an annular electrode seat 3-2-2 and n pairs of electrodes 3-2-1, the annular electrode seat 3-2-2 is fixedly installed in the installation cavity, and the n pairs of electrodes 3-2-1 are annularly distributed and evenly spaced and installed on the annular electrode seat 3-2-2; wherein the n pairs of electrodes 3-2-1 are divided into a paths, each path includes n / a pairs of electrodes 3-2-1, and each path of electrodes 3-2-1 outputs independent electrical signals independently, and n and a are both integers greater than 1; the material of the electrode 3-2-1 is a conductive metal. In this embodiment, a path of electrodes 3-2-1 output electrical signals respectively, and then the friction nano-power generation component outputs a path of electrical signals in total. The number of electrode pairs n determines the sensing resolution of the liquid flow monitoring device, and the larger n is, the higher the monitoring accuracy. The electrode material can be copper, aluminum, silver, etc. In a preferred embodiment, n is 6, a is 2, and the conductive metal is copper. In this embodiment, the stator 3-2 includes a first path of electrodes and a second path of electrodes.

[0032] Reference Fig. 9 In an embodiment in which the friction nano power generation component outputs two electrical signals, the common-mode interference suppression circuit includes: the common-mode interference suppression circuit includes: a first amplifier, a second amplifier and a third amplifier; the first amplifier is used to perform impedance matching on the electrical signal output by the first electrode, and the second amplifier is used to perform impedance matching on the electrical signal output by the second electrode; the positive input terminal and the negative input terminal of the third amplifier are respectively connected to the output terminals of the first amplifier and the second amplifier.

[0033] Specifically, the common-mode interference suppression circuit also includes the first to seventh resistors R1-R7. Among them, the first end and the second end of the first resistor R1 are respectively connected to the electrical signal output end of the first electrode and the positive input end of the first amplifier, the positive input end of the first amplifier is also grounded through the third resistor R3, and the output end of the first amplifier is connected to the negative input end of the third amplifier through the fifth resistor R5; the first end and the second end of the second resistor R2 are respectively connected to the electrical signal output end of the second electrode and the positive input end of the second amplifier, the positive input end of the second amplifier is also grounded through the fourth resistor R4, and the output end of the second amplifier is connected to the positive input end of the third amplifier through the sixth resistor R6; the negative input end of the third amplifier is connected to the output end through the seventh resistor R7 and the positive input end thereof is grounded through the eighth resistor R8, and the output end of the third amplifier outputs the processed electrical signal (sensor signal).

[0034] It should be noted that the above is only a common-mode interference suppression circuit for two electrical signals. It can be expanded to that, in an embodiment where the friction nano power generation component outputs an electrical signal a, the common-mode interference suppression circuit includes a+1 amplifiers, wherein the a amplifier performs impedance matching on the a sensing unit to ensure that the a sensing signals can be subtracted from each other, and finally the a sensing signal is subtracted through an amplifier to subtract the common-mode interference signals, thereby realizing the function of noise suppression.

[0035] In some of the embodiments, the rotor 3-3 is a bearing structure, and the magnetic transmission part 3-4 is fixedly connected to the inner ring of the bearing structure; the ball material of the bearing structure is one of ceramic, polypropylene and polyamide fiber. When the magnetic transmission part 3-4 rotates, it will drive the inner ring of the bearing structure to rotate, thereby causing the ball of the bearing structure to rotate rapidly, and the ball rotates rapidly between each pair of electrodes. Due to the principle of electrostatic induction, the charge is transferred back and forth between the electrodes, thereby generating a regular sine wave. Among them, the distance between the ball and the electrode determines the strength of the sensor signal. The closer the distance, the larger the sensor signal. In one embodiment, the distance between the ball and the electrode is 0.5mm.

[0036] In some of the embodiments, the water wheel group includes a plurality of bionic water wheels 2-3, and the cross section of each bionic water wheel 2-3 is in the shape of a whale. The cross-sectional shape of the water wheel can be obtained by three-dimensional scanning of the whale's body contour. The bionic water wheel 2-3 can reduce the resistance of the water flow and increase the rotation speed of the water wheel. At the same flow rate, the bionic water wheel 2-3 has a higher rotation speed than the traditional water wheel. The rotation speed corresponds to the frequency of the sensor unit 3. The faster the frequency increase means that the sensor's ability to sense water flow changes is more obvious, which represents an increase in the sensitivity of the liquid flow monitoring device.

[0037] As mentioned above, at least one embodiment of each part of the liquid flow monitoring device based on friction nano power generation provided by the present invention has been described respectively. It should be noted that the various parts of the liquid flow monitoring device based on friction nano power generation can be combined using different embodiments to form different embodiments of the liquid flow monitoring device based on friction nano power generation. At the same time, in different embodiments, each structure in the liquid flow monitoring device can also be divided into different modules, and different module divisions will not affect the overall structure of the device.

[0038] For example, in a specific overall embodiment, the liquid flow monitoring device based on friction nanopower generation can also be called a sensor, which includes: a device housing 1, a driving element 2, a sensor unit 3, a sealing assembly 4 and a back-end circuit module 5.

[0039] The device housing 1 includes a pipe joint 1-1, a main housing 1-2, a circuit protection shell 1-3, a dust cover 1-4, a glass plate 1-5 and a fixing cover 1-6. The circuit protection shell 1-3 is placed on the fixing cover 1-6 and fixed.

[0040] The driving element 2 is composed of a water wheel top shaft 2-1, a transmission magnet 2-2 and a bionic water wheel 2-3. The water wheel top shaft 2-1 is fixed to the shaft hole at the top of the bionic water wheel 2-3 by gluing; the transmission magnet 2-2 is interference fit in the magnet mounting groove at the top of the bionic water wheel 2-3; the airfoil section of the bionic water wheel 2-3 is a whale-like shape 2-3-1, which can reduce the resistance of the water flow and increase the rotation speed of the water wheel. At the same flow rate, the bionic water wheel 2-3 has a higher rotation speed than the traditional water wheel. The rotation speed corresponds to the frequency of the sensor unit 3. The faster the frequency increase, the more obvious the sensor's ability to sense changes in water flow, which represents an increase in the sensitivity of the sensor.

[0041] The sensing unit 3 includes a mounting cover 3-1, a stator 3-2, a rotor 3-3 and a magnetic transmission part 3-4; the stator 3-2 includes a circuit of n pairs of electrodes 3-2-1 and an annular electrode seat 3-2-2; the electrodes 3-2-1 are evenly distributed on the annular electrode seat 3-2-2 in an adhesive manner. The a circuit of the electrode 3-2-1 represents that there are n / a pairs of electrodes 3-2-1 in each circuit, and the a-circuit electrodes 3-2-1 are not connected to each other. The number of a represents the number of output sensing unit 3 signals. The more a circuit of electrodes 3-2-1 maintain a phase difference of b degrees between each other. In this specific embodiment, a is 2 and b is 180. The number of electrode pairs n determines the sensing resolution of the sensor. The larger n is, the higher the monitoring accuracy is. In this specific embodiment, n is 6. The materials of the electrodes 3-2-1 include copper, aluminum, silver, etc. In this specific embodiment, the electrodes are made of copper. The rotor 3-3 is a ball bearing, wherein the material of the rotor 3-3 includes ceramic, PP, nylon, etc., and the rotor 3-3 is made of ceramic material in this specific embodiment. When the water flow impacts the bionic water wheel 2-3, the bionic water wheel 2-3 rotates rapidly, and the transmission magnet 2-2 on the bionic water wheel 2-3 drives the magnet at the bottom of the magnetic transmission part 3-4 to rotate synchronously, and the magnetic transmission seal effectively prevents the sensor unit 3 and the rear-end circuit module 5 from being disturbed by water; at the same time, the magnetic transmission part 3-4 is interference-fitted on the rotor 3-3, driving the ball in the rotor 3-3 to rotate. The ball rotates rapidly between the electrode pairs, and due to the principle of electrostatic induction, the charge is transferred back and forth between the electrodes in the electrode, thereby generating a regular sine wave. Among them, a distance d is maintained between the ball and the electrode, and the distance d determines the strength of the sensor signal. The closer the distance, the larger the sensor signal. In this specific embodiment, d is taken as 0.5mm.

[0042] The sealing assembly 4 includes a second sealing gasket 4-1, a sealing shell 4-2 and a first sealing gasket 4-3; the sealing shell 4-2 is composed of a sealing gasket groove 4-2-1, an electrode fixing hole 4-2-2, a rotor fixing seat 4-2-3, a water wheel top shaft hole 4-2-4 and a positioning protrusion 4-2-5; the second sealing gasket 4-1 is placed on the sealing gasket groove 4-2-1, and is buckled by a glass plate 1-5; the first sealing gasket 4-3 is placed on the outer protrusion of the sealing shell 4-2, and then placed on the main shell 1-2, and is buckled by the positioning protrusion 4-2- 5 is fixed to the positioning groove on the main shell 1-2, and finally fixed to the main shell 1-2 by the fixing cover 1-6 through threaded tightening to prevent dust and water vapor in the environment from affecting the sensor unit 3; the bionic water wheel 2-3 is fixed in the water wheel top shaft hole 4-2-4 by the water wheel top shaft 2-1 at its top to achieve axial positioning; the rotor 3-3 is placed on the rotor fixing seat 4-2-3, the stator 3-2 and the installation cover 3-1 are buckled on the rotor 3-3 in turn, and the installation cover 3-1 is fixed to the electrode fixing hole 4-2-2 by bolts.

[0043] The back-end circuit module 5 includes a common-mode interference suppression circuit and a signal processing and remote transmission circuit. The common-mode interference suppression circuit introduces the a-path sensing signal generated by the sensing unit 3, and subtracts the a-path sensing signal through the common-mode interference suppression circuit, which can effectively eliminate the common-mode interference and expand the signal amplitude, thereby effectively improving the stability of sensor monitoring. The signal processing and display circuit processes the generated electrical signal, obtains relevant parameters such as flow velocity and flow, and displays them in real time on the display screen. At the same time, the data is transmitted to the data cloud through the wireless remote transmission module, thereby realizing remote monitoring of water use information anytime and anywhere, which can improve the efficiency, accuracy and visibility of water resource management, help to better meet user needs, reduce waste, protect water resources, and improve the sustainability of the water supply system.

[0044] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0045] Obviously, the drawings are only some examples or embodiments of the present application. For ordinary technicians in the field, the present application can also be applied to other similar situations based on these drawings without creative work. In addition, it is understandable that although the work done in this development process may be complicated and lengthy, for ordinary technicians in the field, certain changes in design, manufacturing or production based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient content disclosed in this application.

Claims

1. A liquid flow monitoring device based on friction nano-power generation, characterized in that: The liquid flow monitoring device comprises a device housing, a driving element, a sensor unit and a sealing component and a circuit protection shell; The device housing has a detection channel for the flow of the liquid to be detected, and the device housing is provided with a mounting port connected to the middle of the detection channel; The sealing assembly is detachably mounted in the mounting opening, and a sealed mounting cavity is provided in the sealing assembly; The sensing unit includes a friction nano power generation component and a magnetic transmission component, the friction nano power generation component includes a stator and a rotor, the rotor and the magnetic transmission component are coaxially rotatably installed in the installation cavity and the rotation axis is perpendicular to the detection channel, the magnetic transmission component can drive the rotor to rotate when rotating, and the stator is fixedly installed in the installation cavity and is located on the side of the rotor away from the detection channel; The driving element comprises a water wheel group and a transmission magnet. The water wheel group is rotatably installed in the middle of the detection channel and is coaxial with the magnetic transmission member. The transmission magnet is fixedly installed at one end of the water wheel group close to the installation opening. When the transmission magnet rotates, it can drive the magnetic transmission member to rotate synchronously through magnetic attraction. A back-end circuit module is installed in the circuit protection shell, and the back-end circuit module includes a common-mode interference suppression circuit, and the common-mode interference suppression circuit is used to process the electrical signal generated by the friction nano power generation component; The stator comprises an annular electrode seat and n pairs of electrodes, the annular electrode seat is fixedly mounted in the mounting cavity, and the n pairs of electrodes are annularly distributed and evenly spaced and mounted on the annular electrode seat; Wherein, the n pairs of electrodes are divided into a paths, each path includes n / a pairs of electrodes, the electrodes in each path are independent of each other and output independent electrical signals respectively, and the material of the electrodes is conductive metal; The rotor is a bearing structure, the magnetic transmission member is fixedly connected to the inner ring of the bearing structure, and the ball material of the bearing structure is one of ceramic, polypropylene and polyamide fiber; When the magnetic transmission part rotates, it will drive the inner ring of the bearing structure to rotate, which in turn causes the balls of the bearing structure to rotate rapidly. The balls then rotate rapidly between each pair of electrodes. Due to the principle of electrostatic induction, the charges are transferred back and forth between the electrodes, thereby generating a regular sine wave.

2. The liquid flow monitoring device based on friction nano-power generation according to claim 1 is characterized in that: The device housing includes a main housing and a pipe joint; The main shell is used to provide the detection channel, the installation port is arranged on the main shell, there are two pipe joints which are respectively installed at the two ends of the detection channel, and the circuit protection shell is installed on the main shell.

3. The liquid flow monitoring device based on friction nano power generation according to claim 2 is characterized in that: The sealing assembly comprises a sealing shell with an opening on one side, a first sealing gasket ring, a second sealing gasket ring, a glass plate and a fixed cover; The top of the inner wall of the installation opening is provided with an annular stepped groove, the top of the outer wall of the sealing shell is provided with an annular protrusion matched with the stepped groove, and the annular protrusion contacts the stepped groove through the first sealing gasket ring; An annular sealing gasket groove is provided on the inner wall of the opening top of the sealing shell, and the edge of the glass plate contacts the sealing gasket groove through the second sealing gasket ring; The fixing cover is installed at the installation opening by threaded connection and has an observation opening facing the glass plate in the middle; The fixing cover cooperates with the stepped groove to clamp and fix the sealing shell, so as to fix the sealing shell in the installation opening; Furthermore, the fixing cover cooperates with the sealing gasket groove to clamp and fix the glass plate, so as to fix the glass plate in the opening of the sealing shell.

4. The liquid flow monitoring device based on friction nano-power generation according to claim 3 is characterized in that: A positioning groove is provided on the inner wall of the installation opening, and a positioning protrusion matched with the positioning groove is provided on the outer wall of the sealing shell; The device housing also includes a dust cover, one side of which is rotatably connected to the main housing and can completely cover the installation opening by rotating.

5. The liquid flow monitoring device based on friction nano-power generation according to claim 1 is characterized in that: The n is 6, and the a is 2; The conductive metal is copper.

6. The liquid flow monitoring device based on friction nano-power generation according to claim 1 is characterized in that: The water wheel assembly comprises a plurality of bionic water wheels, and the cross section of each bionic water wheel is in a whale-like shape.

7. The liquid flow monitoring device based on friction nano-power generation according to claim 1 is characterized in that: The common mode interference suppression circuit comprises: a first amplifier, a second amplifier and a third amplifier; The first amplifier is used to perform impedance matching on the electrical signal output by the first electrode, and the second amplifier is used to perform impedance matching on the electrical signal output by the second electrode; The positive input terminal and the negative input terminal of the third amplifier are connected to the output terminals of the first amplifier and the second amplifier respectively.

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