CN115993154A

CN115993154A - Self-powered water flow detector

Info

Publication number: CN115993154A
Application number: CN202310079185.9A
Authority: CN
Inventors: 程廷海; 何思扬; 王中林; 李恒禹
Original assignee: Beijing Institute of Nanoenergy and Nanosystems
Current assignee: Beijing Institute of Nanoenergy and Nanosystems
Priority date: 2023-01-18
Filing date: 2023-01-18
Publication date: 2023-04-21

Abstract

The application discloses a self-powered water flow detector comprises a shell, a power unit, a sensing unit, a power generation unit, a power management unit and a communication unit, wherein the shell is provided with a fluid channel, the power unit is arranged in the fluid channel and comprises an impeller, and fluid in the fluid channel is used for driving the impeller to rotate; the sensing unit is in transmission connection with the impeller, and the impeller is used for driving the sensing unit to generate a sensing signal; the power generation unit is in transmission connection with the impeller, and the impeller is also used for driving the power generation unit to generate an electric signal to supply power for the power management unit; the power management unit is electrically connected with the communication unit and is used for supplying power to the communication unit; the communication unit is used for collecting the sensing signals and sending the sensing signals to the remote terminal. The monitoring instrument can be arranged in a fluid pipeline, and fluid enters a fluid channel to enable the impeller to rotate. The impeller is driven to the sensing unit and the power generation unit when rotating, thereby generating a sensing signal and an electric signal. The fluid flow is monitored in real time by monitoring the sensing signals.

Description

Self-powered water flow detector

Technical Field

The application relates to the technical field of instruments, in particular to a self-powered water flow detector.

Background

The fluid flow monitoring has very important practical significance for industrial production, schedule life and fluid transportation, and the intelligent monitoring sensor is widely applied to various pipe networks, such as: urban water supply, agricultural irrigation, industrial transportation, sewage discharge, petroleum exploitation and other fields. Whereas the most common conventional flow monitoring sensors are mainly mechanical sensors, the field of intelligent sensors is gradually rising as the concept of "smart city" is introduced.

The intelligent sensor is used for accurately monitoring and recording flow information, so that the improvement of monitoring accuracy is important in improving the intelligent manufacturing level and promoting the development of the sensor industry. In the prior art, an instrument for detecting liquid needs continuous power supply of an external power supply or periodically replaces a lithium battery, so that the instrument can monitor the liquid flow in real time, and further the energy consumption is higher.

Disclosure of Invention

The application provides a self-powered water flow detector, when detecting liquid flow, can also reduce the consumption of energy.

In order to achieve the above purpose, the self-powered water flow detector provided by the application comprises a shell, a power unit, a sensing unit, a power generation unit, a power management unit and a communication unit, wherein the shell is provided with a fluid channel, the power unit is arranged in the fluid channel, the power unit comprises an impeller, and fluid in the fluid channel is used for driving the impeller to rotate; the sensing unit is in transmission connection with the impeller, and the impeller is used for driving the sensing unit to generate a sensing signal; the power generation unit is in transmission connection with the impeller, and the impeller is also used for driving the power generation unit to generate an electric signal to supply power for the power management unit; the power management unit is electrically connected with the communication unit and is used for supplying power to the communication unit; the communication unit is used for collecting the sensing signals and sending the sensing signals to the remote terminal.

The self-powered water flow detector can be arranged in a fluid pipeline, and fluid in the fluid pipeline enters a fluid channel of the shell to enable an impeller of the power unit to rotate. In the rotating process of the impeller, the impeller is simultaneously driven to the sensing unit and the power generation unit, so that the sensing unit generates a sensing signal, and the power generation unit generates an electric signal. The frequency of the sensing signal is positively correlated with the flow of the fluid, and the flow of the fluid is monitored in real time by monitoring the sensing signal. The electric signal generated by the power generation unit can supply power for the power management unit, and meanwhile, the power management unit can also supply power for the communication unit, so that the self-powered water flow detector realizes self power supply, and energy consumption is saved. The communication unit processes and converts the sensing signals acquired in real time into fluid real-time flow data and sends the fluid real-time flow data to the remote terminal.

In an alternative technical scheme, the power unit further comprises an impeller box, and the impeller is arranged in the impeller box; the side wall of the impeller box is provided with a through hole, and the fluid flows into the impeller box from the through hole to drive the impeller to rotate.

In an alternative technical scheme, the sensing unit comprises a first rotor and a first stator, wherein the first rotor is in transmission connection with the impeller through a rotating shaft, and the first rotor rotates relative to the first stator under the driving of the impeller so as to generate the sensing signal.

In an optional technical scheme, the first rotor comprises a plurality of first friction plates and a first rotor substrate, wherein the first friction plates are arranged on one side of the first stator substrate facing the first stator and are distributed along the circumferential direction of the first rotor substrate; the first stator comprises a first electrode plate, a plurality of second electrode plates and a first stator base plate, and the first electrode plate and the plurality of second electrode plates are arranged on one side of the first stator base plate facing the first friction plate; the plurality of second electrode plates are uniformly distributed along the circumferential direction of the first stator substrate, the first electrode plates are positioned between any two adjacent second electrode plates, and the thickness a of the first electrode plates and the thickness b of the second electrode plates meet a > b; the first rotor rotates relative to the first stator to drive the first friction plate to be in contact with the first electrode plate so as to realize charge transfer, and the first friction plate is in non-contact with the second electrode plate to generate the sensing signal.

In an alternative technical scheme, the power generation unit comprises a second stator and a first magnetic part, the second stator comprises a first body and a first coil, the first body is provided with a first accommodating groove, the first coil is positioned in the first accommodating groove, and the second stator is positioned on one side of the first rotor, which is away from the first stator. The first magnetic piece is arranged on one side of the first rotor base plate facing the second stator, and the position of the first magnetic piece corresponds to the position of the first coil. The first rotor rotates relative to the second stator to drive the first magnetic member to move relative to the first coil to generate the electrical signal.

In an optional technical scheme, the first rotor comprises a base frame and a plurality of second friction plates, the base frame is provided with a plurality of first support plates which are radially distributed along the axis of the base frame, the second friction plates are arranged at one end of the first support plates, which is far away from the axis of the base frame, and correspond to the first support plates one by one, and the second friction plates are parallel to the axial direction of the base frame. The first stator comprises a first sleeve and a plurality of third electrode plates, and the third electrode plates are arranged on the inner wall of the first sleeve. The first rotor is arranged in the first sleeve, and rotates relative to the first stator to drive the second friction plates to sequentially rub each third electrode plate to generate the sensing signals.

In an alternative solution, the power generating unit includes a third rotor and a third stator, where the third rotor includes a second rotor base plate and a plurality of third friction plates, and the plurality of third friction plates are distributed along a circumferential direction of the second rotor base plate. The third stator comprises a second stator substrate and a plurality of fourth electrode plates, the fourth electrode plates are uniformly distributed along the circumferential direction of the second stator substrate, and two adjacent fourth electrode plates are electrically connected. The third rotor rotates relative to the third stator to drive the third friction plate to rub against the fourth electrode plate to generate the electric signal.

In an optional technical scheme, the first rotor comprises a rotating block and a plurality of fifth electrode plates, the plurality of fifth electrode plates are arranged on the side wall of the rotating block and are arranged in p rows, and the positions of the fifth electrode plates in each row along the axial direction of the rotating block correspond to each other. The first stator comprises a fourth friction plate and a plurality of sixth electrode plates, the fourth friction plate is cylindrical, the plurality of sixth electrode plates are arranged on the outer wall of the fourth friction plate, two adjacent sixth electrode plates are arranged in a staggered mode along the axial direction of the fourth friction plate, and the sixth electrode plates are arranged in s rows with s=p. The first rotor rotates relative to the first stator to drive the fifth electrode plate to rub against the fourth friction plate to generate the sensing signal.

In an alternative solution, the power generating unit includes a fourth rotor and a fourth stator, where the fourth rotor includes a third rotor base plate and a plurality of fifth friction plates, and the fifth friction plates are distributed along a circumferential direction of the third rotor base plate. The fourth stator comprises a third stator substrate and a plurality of seventh electrode plates, and the seventh electrode plates are distributed along the circumferential direction of the third stator substrate. The fourth rotor rotates relative to the fourth stator to drive the fifth friction plate to rub against the seventh electrode plate to generate the electric signal. In an optional technical scheme, the first rotor comprises a rotor support and a plurality of sixth friction plates, the rotor support is provided with a plurality of second support plates which are radially distributed along the axis of the rotor support, the sixth friction plates are arranged at one end, away from the axis of the rotor support, of the second support plates and are in one-to-one correspondence with the second support plates, and the sixth friction plates are parallel to the axial direction of the rotor support. The first stator comprises a second sleeve and a plurality of eighth electrode plates, and the eighth electrode plates are arranged on the inner wall of the second sleeve. The first rotor is arranged in the second sleeve, and rotates relative to the second sleeve to drive the sixth friction plate to rub against the eighth electrode plate to generate the sensing signal.

In an optional technical scheme, the power generation unit comprises a fifth stator and a second magnetic part, the fifth stator comprises a second body and a second coil, the second body is provided with a second accommodating groove, the second coil is located in the second accommodating groove, and the fifth stator is connected to one end of the second sleeve. The second magnetic piece is arranged between two adjacent sixth friction plates of the rotor support, and the position of the second magnetic piece corresponds to the position of the second coil. The first rotor rotates relative to the fifth stator to drive the second magnetic piece to move relative to the second coil to generate the electric signal.

In an alternative solution, the power generation unit further includes a sixth stator, where the sixth stator is disposed on a side of the second rotor facing away from the fifth stator. The sixth stator comprises a third body and a third coil, wherein the third body is provided with a third accommodating groove, the third coil is positioned in the third accommodating groove, and the third coil corresponds to the second coil in position. The first rotor rotates relative to the sixth stator to drive the second magnetic piece to move relative to the third coil to generate the electric signal.

In an alternative technical scheme, the rotating shaft is magnetically adsorbed and connected with the impeller through a magnetic piece.

In an optional technical scheme, the communication unit comprises a singlechip and a display module, and the singlechip is electrically connected with the display module; the battery management unit comprises a rectifying circuit, and the rectifying circuit is electrically connected with the power generation unit.

Drawings

FIG. 1 is a schematic structural diagram of a self-powered water flow detector according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a housing structure of the self-powered water flow detector according to the embodiment of the present application;

FIG. 3 is a schematic diagram of a power unit according to an embodiment of the present application;

FIG. 4 is a schematic view of the impeller box according to an embodiment of the present application;

FIG. 5 is a schematic structural view of a seal cartridge according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a first rotor according to the first embodiment;

fig. 7 is a schematic structural diagram of a first stator according to the first embodiment;

fig. 8 is a schematic structural diagram of a second stator according to the first embodiment;

FIG. 9 is a schematic view showing another angle of the first substrate according to the first embodiment;

FIG. 10 is a schematic structural view of a bracket according to an embodiment of the present application;

FIG. 11 is a schematic structural view of a first shaft according to the first embodiment;

Fig. 12 is an assembly view of a first stator, a second stator, a first rotor, a bracket and a seal case in the first embodiment;

fig. 13 is a schematic structural view of a first rotor in the second embodiment;

fig. 14 is a schematic structural diagram of a first stator in the second embodiment;

fig. 15 is a schematic structural view of a third rotor in the second embodiment;

fig. 16 is a schematic structural view of a third stator in the second embodiment;

FIG. 17 is a schematic diagram of a second shaft in the second embodiment;

fig. 18 is an assembly view of a first rotor, a first stator, a third rotor, a third stator, a bracket, and a seal case in the second embodiment;

fig. 19 is a schematic structural view of a first rotor in the third embodiment;

fig. 20 is a schematic structural view of a first stator in the third embodiment;

fig. 21 is a schematic structural view of a fourth rotor in the third embodiment;

fig. 22 is a schematic structural view of a fourth stator in the third embodiment;

fig. 23 is a schematic structural view of a third shaft in the third embodiment;

fig. 24 is a schematic structural view of a first rotor, a first stator, a fourth rotor, a fourth stator, a third rotating shaft, a bracket and a seal box in the third embodiment;

fig. 25 is a schematic structural view of a first rotor in the fourth embodiment;

fig. 26 is an assembly view of a first stator and a sixth stator in the fourth embodiment;

Fig. 27 is a schematic structural view of a fifth stator in the fourth embodiment;

fig. 28 is a schematic structural view of a first rotor, a first stator, a fifth stator, a sixth stator, a bracket, a fourth rotating shaft, and a seal box in the fourth embodiment;

fig. 29 is a schematic structural view of a fourth shaft in the fourth embodiment.

Reference numerals:

1-a housing; 2-a power unit; 17-fluid channel; 31-impeller box; 32-an impeller; 312-liquid inlet holes; 324-impeller shaft; 322-leaves; 21-a seal box; 215-a second latch; 15-a receiving cavity; 12-top cover; 13-top cover glass;

242-a first friction plate; 243-a first rotor substrate; 232-a second electrode sheet; 231-a first electrode sheet; 234-a first stator substrate; 25-a second stator; 245-a first magnetic member; 251-a first body; 252-a first coil; 22-a bracket; 221-a bracket top plate; 225-a bracket bottom plate; 2251-a central bore; 223-finer section; 224-thicker portion; 24-a first rotating shaft; 2411-a first thimble; 2414-a second thimble; 222-a first jack; 213-a second jack; 244-a first ring magnet; 321-a second ring magnet; 212-a first card slot;

62-a base frame; 621-a first support plate; 623-a second friction plate; 632-a first sleeve; 631-a third electrode tab; 64-a third rotor; 641-third friction plate; 65-a third stator; 642-a second rotor substrate; 652-a second stator substrate; 651-fourth electrode pad; 61-a second rotating shaft; 611-first thimble, 614-second thimble, 612-first boss, 613-second boss;

731-turning blocks; 733-fifth electrode sheet; 722-fourth friction plate; 723-sixth electrode sheet; 74-a fourth rotor; 75-a fourth stator; 742-a third rotor substrate; 741-fifth friction plate; 752-a third stator substrate; 751-seventh electrode sheet; 721-supporting the sleeve; 76-a third spindle; 761-third boss; 762-fourth boss; 763-a third thimble; 764-fourth thimble;

813-a rotor support; 812-sixth friction plate; 8131-second plate; 831-second sleeve; 832-eighth electrode pad; 82-a fifth stator; 811-a second magnetic member; 821-a second body; 822-a second coil; 8211-a second accommodation groove; 83-a sixth stator; 833-a third coil; 830-a third body; 8301-a third accommodating groove; 84-fourth rotating shaft; 841-fifth thimble; 843-sixth thimble; 842-mount keys.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Fig. 1 is a schematic structural diagram of a self-powered water flow detector provided in an embodiment of the present application, fig. 2 is a schematic structural diagram of a housing of the self-powered water flow detector provided in an embodiment of the present application, and fig. 3 is a schematic structural diagram of a power unit of an embodiment of the present application. Referring to fig. 1 to 3, a self-powered water flow detector includes a housing 1, a power unit 2, a sensing unit, a power generation unit, a communication unit and a power management unit. The housing 1 has a fluid channel 17, the power unit 2 is disposed in the fluid channel 17, the power unit 2 includes an impeller 32, and fluid in the fluid channel 17 is used for driving the impeller 32 to rotate. The sensing unit is in transmission connection with the impeller 32, and the impeller 32 is used for driving the sensing unit to generate a sensing signal. The power generation unit is in transmission connection with the impeller 32, and the impeller 32 is also used for driving the power generation unit to generate an electric signal to supply power for the power management unit. The power management unit is electrically connected with the communication unit and is used for supplying power to the communication unit. The communication unit is used for collecting the sensing signals and sending the sensing signals to the remote terminal.

The self-powered water flow detector may be installed in a fluid line, where fluid in the fluid line enters the fluid channel 17 of the housing 1, causing the impeller 32 of the power unit 2 to rotate. The impeller 32 is driven to both the sensing unit and the power generation unit during rotation, whereby the sensing unit generates a sensing signal and the power generation unit generates an electrical signal. The frequency of the sensing signal is positively correlated with the flow of the fluid, and the flow of the fluid is monitored in real time by monitoring the sensing signal. The electric signal generated by the power generation unit can supply power for the power management unit, and meanwhile, the power management unit can also supply power for the communication unit, so that the self-powered water flow detector realizes self power supply, and energy consumption is saved. The communication unit processes and converts the sensing signals acquired in real time into fluid real-time flow data and sends the fluid real-time flow data to the remote terminal.

In an alternative embodiment, the communication unit (not shown in the figure) may include a single-chip microcomputer, a wireless communication module, and a display module. The singlechip is electrically connected with the display module. Wherein, the singlechip can be 51 series singlechip, STM32 series singlechip, etc. The wireless communication module can be a Bluetooth module, a distance wireless communication module (LoRa), a single-chip radio frequency transceiver module (nRF 24L 01) and the like. Specifically, the singlechip may be a singlechip using STM32F103 as a core chip. The wireless communication module employs nRF24L01. The singlechip converts the analog signals output by the sensing unit into digital signals and controls the wireless communication module to send the digital signals to the remote terminal, so that the real-time monitoring of the flow of the fluid is realized. Or the singlechip converts the analog signal output by the sensing unit into a digital signal and then directly transmits the digital signal to the display module for display.

In an alternative embodiment, the power management unit may include a rectifying circuit, a DC-DC converting circuit, a fully controlled switching circuit, and a battery. The rectifying circuit comprises a half-wave rectifying circuit, a full-wave rectifying circuit, a bridge rectifying circuit, a voltage doubling rectifying circuit and the like. Specifically, the rectifying circuit takes a bridge rectifying circuit as a core. The battery adopts a 18650 rechargeable lithium battery as a core battery. The full-control switch circuit adopts a full-control switch taking an MOS tube 2N7000 as a core. The power generation unit converts the output alternating current electric signal into direct current through the bridge rectifier circuit, the DC-DC conversion circuit carries out conversion treatment on the direct current, the converted electric signal is distributed through the full-control switch, and when the electric energy requirement of the communication unit is large, the battery can be supplemented, so that active cooperative power supply is realized.

In an alternative embodiment, the display module may further include a wireless circuit. The radio circuit is used for communicating with the remote terminal and transmitting the display data of the display module to the remote terminal.

Fig. 5 is a schematic structural view of a seal box according to an embodiment of the present application. In an alternative embodiment, as shown in fig. 5, the self-powered water flow detector may further include a sealing box 21, and the power unit 2, the sensing unit, the power generation unit, the communication unit and the power management unit are installed in the sealing box 21 to avoid damage caused by immersion in fluid.

Fig. 3 is a schematic structural view of a power unit according to an embodiment of the present application, and fig. 4 is a schematic structural view of an impeller box according to an embodiment of the present application. In an alternative embodiment, as shown in fig. 3 and 4, the power unit may further include an impeller box 31, and an impeller 32 is disposed in the impeller box 31. The impeller box 31 has a liquid inlet 312 on its side wall, and fluid flows into the impeller box 31 from the liquid inlet 312 to drive the impeller 32 to rotate. Specifically, the impeller box 31 may be a cylindrical cavity. The impeller 32 includes an impeller shaft 324 and blades 322 disposed circumferentially along the impeller shaft 324, the blades 322 being arranged radially. The impeller 32 is arranged concentrically with the impeller box 31. The inlet 312 may be a tangential hole, i.e., the inlet 312 is oriented at an angle to the impeller shaft 324 such that fluid from the inlet 312 is directed toward the blades 322 of the impeller 32 rather than toward the impeller shaft 324 when entering the impeller box 31, thereby reducing the risk of obstructing the rotation of the impeller 32.

With continued reference to fig. 2, in an alternative embodiment, the housing 1 has a receiving cavity 15, and a seal case 21 may be disposed in the receiving cavity 15. The fluid passage 17 is located at one end of the accommodating chamber 15 and communicates with the accommodating chamber 15. An impeller box 31 is provided in the fluid passage 17. The impeller box 31 is docked at its top with the bottom of the seal box 21. The housing 1 further includes a top cover 12 and a top cover glass 13. The cover glass 13 is embedded in the top cover 12. The top cover 12 covers the top of the accommodating cavity 15.

In an alternative embodiment, the sensing unit may include a first rotor and a first stator, where the first rotor is in driving connection with the impeller 32 via a rotating shaft. Specifically, the first rotor is disposed opposite to and concentric with the first stator. The first rotor rotates relative to the first stator under the drive of the impeller to generate a sensing signal.

In an alternative embodiment, the connection between the rotating shaft and the impeller may be a magnetic connection by using a magnetic member.

The following describes the structure of the sensor unit and the power generation unit in detail with reference to various embodiments.

Embodiment one:

fig. 6 is a schematic structural diagram of a first rotor in the first embodiment. As shown in fig. 6, the sensing unit may include a first rotor and a first stator. The first rotor includes a plurality of first friction plates 242 and a first rotor base 243, and the first rotor base 243 may have a circular shape. The first friction plates 242 are disposed on a side of the first rotor substrate 243 facing the first stator, and are uniformly distributed along the circumferential direction of the first rotor substrate 243.

Fig. 7 is a schematic structural diagram of a first stator in the first embodiment. As shown in fig. 7, the first stator includes one first electrode pad 231, a plurality of second electrode pads 232, and a first stator substrate 234. The first electrode tab 231 and the plurality of second electrode tabs 232 are disposed on a side of the first stator substrate 234 facing the first friction tab 242, and the first electrode tab 231 and the second electrode tab 232 correspond to any one of the first friction tabs 242 in position, so that the first friction tab 242 can be in contact with the first electrode tab 231 when the first stator and the first rotor relatively rotate. The plurality of second electrode pads 232 are uniformly distributed along the circumferential direction of the first stator base 234. The first electrode tab 231 is located between any two adjacent second electrode tabs 232. The thickness a of the first electrode tab 231 and the thickness b of the second electrode tab 232 satisfy a > b. The first rotor rotates relative to the first stator to drive the first friction plate 242 to contact the first electrode plate 231 to generate charge transfer, and meanwhile, the first friction plate 242 rotates relative to the second electrode plate 232 in a non-contact manner to generate a sensing signal.

The two adjacent second electrode pads 232 constitute a pair of electrodes. Since the thickness of the first electrode pad 231 is greater than the thickness of the second electrode pad 232, the first electrode pad 231 and the first friction pad 242 are in contact with each other, and the second electrode pad 232 and the first friction pad 242 are not in contact with each other when the first rotor rotates. When the first rotor rotates, first, the first electrode plate 231 contacts with the first friction plate 242 to transfer charges between the first electrode plate 231 and the first friction plate 242, and the first friction plate 242 is negatively charged. Then, the first friction plate 242 continues to rotate, and when the first friction plate 242 passes through the second electrode plate 232, the charges of the first friction plate 242 and the second electrode plate 232 are transferred, so that the second electrode plate 232 is positively charged, and a sensing signal is generated. The first electrode pad 231 can supplement the second electrode pad 232 with electric charges. The above-described non-contact mode improves durability of the use of the second electrode sheet 232, and reduces frictional wear of the second electrode sheet 232, thereby improving the service life of the first stator. And, the monitoring accuracy is improved.

Further, the second electrode pad 232 is identical in shape and area to the first electrode pad 231. The first stator substrate 234 may be circular, and the first electrode pad 231 and the second electrode pad 232 may be fan-shaped.

In the specific selection of the materials of the first electrode pad 231, the second electrode pad 232, and the first friction plate 242, conductive materials such as copper, aluminum, silver, and rabbit hair may be selected as the materials of the first electrode pad 231; conductive materials such as copper, aluminum, silver and the like are used as the materials of the second electrode piece 232; polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), and the like are used as the material of the first friction plate. In the above embodiment, rabbit hair is preferable as the material of the first electrode sheet 231, copper as the material of the second electrode sheet 232, and Polytetrafluoroethylene (PTFE) as the material of the first friction sheet 242. The selection of the above materials can produce a relatively stable electrical signal.

Fig. 8 is a schematic structural view of a second stator in the first embodiment, and fig. 9 is a schematic structural view of a first rotor base plate in the first embodiment at another angle. Referring to fig. 8 and 9, the power generating unit may include a second stator 25 and a first magnetic member 245, where the second stator includes a first body 251 and a first coil 252, the first body 251 is provided with a first accommodating groove, and the first coil 252 is located in the first accommodating groove. The second stator 25 is located on the side of the first rotor facing away from the first stator. The first magnetic element 245 is disposed on a side of the first rotor substrate 243 facing the second stator, and the position of the first magnetic element 245 corresponds to the position of the first coil 252. Specifically, the number of the first magnetic members 245 may be the same as the number of the first coils 252, and in this embodiment, six first magnetic members 245 are used, and 6 coils 252 are correspondingly disposed. The first rotor rotates relative to the second stator to drive the first magnetic member 245 to move relative to the first coil 252, and the first magnetic member 245 cuts the magnetic induction wire of the first coil 252 to generate an electrical signal. The generated electrical signal can power the communication unit through the power management unit.

Fig. 10 is a schematic structural view of a bracket in the first embodiment, and fig. 12 is an assembly view of a first stator, a second stator, a first rotor, a bracket and a seal box in the first embodiment. As shown in fig. 10 and 12, the self-powered water flow meter may further include a bracket 22, where the bracket 22 includes a bracket top plate 221 and a bracket bottom plate 225, and a bracket beam is provided at an edge of the bracket top plate 221 opposite to the bracket bottom plate 225. The thinner portion 223 of the upper end of the bracket beam may be used to mount the first stator base 234 and the thicker portion 224 of the lower end of the bracket beam is used to mount the first body 251. To stabilize the first stator base 234 and the first body 251 installation, three bracket beams may be provided. Accordingly, the first stator base 234 and the first body 251 are provided with mounting holes corresponding to the positions of the bracket beams.

Fig. 11 is a schematic structural diagram of a first shaft in the first embodiment. Referring to fig. 10, 11 and 5, the first rotor is fixed to the bracket 22 by a first shaft 24, and specifically, the first shaft 24 may include a first thimble 2411 located at the top of the shaft and a second thimble 2414 located at the bottom of the shaft. The center of the bracket top plate 221 is provided with a first insertion hole 222. The bottom of the sealing case 21 is provided with a second insertion hole 213. The first thimble 2411 is inserted into the first jack 222, the side wall of the rotating shaft in which the second thimble 2414 is inserted into the second jack 213 is further provided with a rotor mounting key 2412, and the first rotor substrate 243 is fixed on the first rotating shaft 24 by the mounting key 2412, so that the first rotor substrate 243 rotates together with the first rotating shaft 24.

With continued reference to fig. 3, 5 and 6, the end of the first shaft 24 near the impeller is provided with a first ring magnet 244, and the end of the impeller shaft 324 facing the first rotor is provided with a second ring magnet 321. The first shaft 24 extends downwardly through a central opening 2251 in the bracket floor 225. The first ring magnet 244 is disposed in the first clamping groove 212 facing the inside of the bottom of the sealing case 21. The second ring-shaped magnet 321 is sleeved on the second clamping block 215 facing the outer side at the bottom of the sealing box 21. The first ring magnet 244 is attracted to the underlying second ring magnet 321, thereby drivingly connecting the first shaft 24 to the impeller shaft 324.

Embodiment two:

fig. 13 is a schematic structural diagram of a first rotor in the second embodiment. As shown in fig. 13, the sensing unit may include a first rotor and a first stator. The first rotor may include a base frame 62 and a plurality of second friction plates 623. The base frame 62 has a plurality of first support plates 621 radially distributed along the axis of the base frame 62, and the second friction plates 623 are disposed at one end of the first support plates 621 away from the axis of the base frame and are in one-to-one correspondence with the first support plates 621. The second friction plate 623 is parallel to the axial direction of the base frame 62.

Fig. 14 is a schematic structural diagram of a first stator in the second embodiment. As shown in fig. 14, the first stator includes a first sleeve 632 and a plurality of third electrode pieces 631, and the plurality of third electrode pieces 631 are provided on an inner wall of the first sleeve 632. The first rotor is disposed in the first sleeve 632, and rotates relative to the first rotor to drive the second friction plate 623 to sequentially rub against each third electrode plate 631 to generate a sensing signal.

The material of the second friction plate 623 may be Polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), or the like. Preferably, the material of the second friction plate 623 is fluorinated ethylene propylene copolymer (FEP). Its tensile strength, abrasion resistance, creep resistance are lower than many engineering plastics. FEP is chemically inert and has a low dielectric constant over a wide temperature and frequency range. Because the second friction plate 623 has a softer texture, when the first rotor is mounted on the first sleeve 632, the second friction plate 623 can be bent inward, so that the contact area between the second friction plate 623 and the third electrode plate 631 is larger, and the generated sensing signal has higher accuracy.

Alternatively, the third electrode pads 631 may be interdigital electrodes, and two adjacent third electrode pads 631 form a pair of electrodes. The number of the third electrode pads 631 is k, and the number of k determines the accuracy of the sensing signal, and the higher the value of k is, the higher the monitoring accuracy is. K may range from 2< K <1000. In the present embodiment, k=12. The third electrode sheet 631 may be made of copper, aluminum, silver, rabbit hair, or the like, and preferably copper.

Fig. 15 is a schematic structural view of a third rotor in the second embodiment, and fig. 16 is a schematic structural view of a third stator in the second embodiment. As shown in fig. 15 and 16, alternatively, the power generation unit may include a third rotor 64 and a third stator 65, the third rotor 64 including a second rotor base plate 642 and a plurality of third friction plates 641, the plurality of third friction plates 641 being uniformly distributed along a circumferential direction of the second rotor base plate 642. The third stator 65 includes a second stator substrate 652 and a plurality of fourth electrode pads 651, the plurality of fourth electrode pads 651 being uniformly distributed along a circumferential direction of the second stator substrate 652. Two adjacent fourth electrode pads 651 are electrically connected to constitute a pair of electrodes. The third rotor 64 rotates with respect to the third stator 65 to drive the third friction plate 641 to rub against the fourth electrode plate 651 to generate an electrical signal.

Alternatively, the number m of the third friction plates 641 and the number n of the fourth electrode plates 651 described above satisfy n=4m. Specifically, the total area of the plurality of third friction plates 641 determines how much to generate an electrical signal. In this embodiment, m=6. Two adjacent fourth electrode pads 651 constitute a pair of electrodes, which are two equally spaced electrodes. Compared with the equidistant electrodes, the equidistant electrodes have higher output performance, and the generated power of the two equidistant electrodes is higher than that of the electrodes arranged in an equidistant mode.

Optionally, any two adjacent fourth electrode pads 651 above form a pair of electrodes. In this embodiment, there are 24 fourth electrode pads 651, then there are 12 pairs of electrodes. Two fourth electrode pads 651 of the spaced pair of electrodes are electrically connected. That is, any one of the pairs of electrodes is selected as the first pair of electrodes, and the electrodes are arranged in the clockwise direction as the second pair of electrodes, the third pair of electrodes, the fourth pair of electrodes, and the like. If the two fourth electrode pieces of the first pair of electrodes are electrically connected, the two fourth electrode pieces of the third, fifth, seventh, ninth and eleventh pairs of electrodes are also electrically connected. Charge transfer can be performed between the two fourth electrode pads 651 electrically connected.

In the case of specifically selecting the material of the third friction plate 641, polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), or the like may be selected, and Polytetrafluoroethylene (PTFE) is preferable. Polytetrafluoroethylene has the advantages of high temperature resistance and low friction coefficient. The fourth electrode sheet may be made of copper, aluminum, silver, rabbit hair, etc., preferably copper.

Fig. 17 is a schematic structural diagram of a second shaft in the second embodiment, and fig. 18 is an assembly diagram of a first rotor, a first stator, a third rotor, a third stator, a bracket, and a seal box in the second embodiment. As shown in fig. 17 and 18, the base frame 62 and the second rotor base plate 642 are fixedly attached to the second rotating shaft 61 by an attachment key, and can rotate together with the second rotating shaft 61. The second shaft 61 is in driving connection with the impeller shaft 324. Specifically, the second rotating shaft 61 and the impeller shaft may be connected by magnetic attraction, which is the same as the connection between the first rotating shaft 24 and the impeller shaft 324 in the first embodiment, and will not be described herein. The shaft circumference can be provided with bosses with different diameters, and the base frame 62 and the second rotor base plate 642 are clamped on the different bosses, so that the sliding condition of the base frame 62 or the second rotor base plate 642 along the axial direction of the thinking shaft 61 is reduced. Specifically, the base frame 62 may be mounted to the first boss 612, and the second rotor substrate 642 may be mounted to the second boss 613. The second stator substrate 652 and the first sleeve 632 may be fixedly mounted to the bracket 22, which in the present embodiment has the same bracket structure as in the first embodiment. The top and the bottom of the second rotating shaft 61 are respectively provided with a first thimble 611 and a second thimble 614, the first thimble 611 is inserted into the first jack 222 of the bracket, and the second thimble 614 is inserted into the second jack 213 of the sealing box, so that the second rotating shaft 61 is assembled. The assembly of the second shaft 61, the bracket and the seal box is the same as the assembly of the first shaft in the first embodiment, and will not be described here again.

Embodiment III:

fig. 19 is a schematic structural view of a first rotor in the third embodiment. As shown in fig. 19, the sensing unit may include a first rotor and a first stator. The first rotor may include a rotation block 731 and a plurality of fifth electrode plates 733, and the rotation block 731 may be a cylinder. The plurality of fifth electrode plates 733 are disposed at the side wall of the rotating block 731 and are arranged in p rows, and each row of fifth electrode plates 733 corresponds in position along the axial direction of the rotating block 731. Specifically, p=3. The plurality of fifth electrode pieces 733 are arranged in three rows. The fifth electrode tab of each row corresponds to the fifth electrode tab of an adjacent row. That is, each column has three fifth electrode pieces 733.

Fig. 20 is a schematic structural diagram of a first stator in the third embodiment, as shown in fig. 20, the first stator includes a fourth friction plate 722 and a plurality of sixth electrode plates 723, the fourth friction plate 722 is cylindrical, the plurality of sixth electrode plates 723 are disposed on an outer wall of the fourth friction plate 722, two adjacent sixth electrode plates are staggered along an axial direction of the fourth friction plate 722, and the sixth electrode plates are arranged in s rows, s=p. In the present embodiment, s=p=3. Each row of sixth electrode plates 723 is a phase, the first stators share three-phase electrodes, and each phase electrode has a certain phase difference. The three-phase electrode improves the resolution of fluid flow detection by Q-degree phase difference. In this embodiment, q=30°. The first rotor rotates relative to the first stator to drive the fifth electrode piece 733 to rub against the fourth friction plate 722 to generate a sensing signal.

The fourth friction plate 722 may be made of Polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), or the like, and is preferably Polytetrafluoroethylene (PTFE). The sixth electrode tab 723 may be made of copper, aluminum, silver, rabbit hair, or the like, and preferably copper. The fifth electrode piece 733 may be made of gold, copper, aluminum, silver, rabbit hair, or the like, preferably copper.

Fig. 21 is a schematic structural view of a fourth rotor in the third embodiment, and fig. 22 is a schematic structural view of a fourth stator in the third embodiment. As shown in fig. 21 and 2, alternatively, the above-described power generation unit may include a fourth rotor 74 and a fourth stator 75, the fourth rotor 74 including a third rotor base plate 742 and a plurality of fifth friction plates 741, the fifth friction plates 741 being uniformly distributed along the circumferential direction of the third rotor base plate 742. The fourth stator includes a third stator substrate 752 and a plurality of seventh electrode tabs 751, the plurality of seventh electrode tabs 751 being circumferentially distributed on the third stator substrate. The fourth rotor 74 rotates with respect to the fourth stator 75 to drive the fifth friction plate 741 to rub against the seventh electrode plate 751 to generate an electrical signal.

The fifth friction plate 741 is made of Polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), rabbit hair, wood, fabric, or the like, preferably rabbit hair.

In the present embodiment, the number of the seventh electrode sheets 751 may be 32. The number of the fifth friction plates 741 is 4. The two adjacent seventh electrode plates 751 form a pair of electrodes, and the seventh electrode plates 751 can realize low peak factor through parallel phase difference rectification superposition, so that average power is effectively improved. The fifth friction plate 741 can cover the 4 seventh electrode plates 751. The width of the fifth friction plate 741 is larger than the width of the seventh electrode plate 751. The two seventh electrode tabs 751 of the spaced pair of electrodes are electrically connected in electrical connection with the fourth electrode tab of the second embodiment.

With continued reference to fig. 20, the first stator further includes a support sleeve 721, a fourth friction plate 722 is mounted on the support sleeve 721, and specifically, a sixth electrode plate 723 is disposed between the support sleeve 721 and the fourth friction plate 722.

Fig. 23 is a schematic structural view of a third rotating shaft in the third embodiment, and fig. 24 is a schematic structural view of a first rotor, a first stator, a fourth rotor, a fourth stator, a third rotating shaft, a bracket and a seal box in the third embodiment. Referring to fig. 23 and 24, the rotation block 731 and the third rotor base 742 are fixedly mounted to the third rotation shaft 76 by mounting keys. The third rotary shaft 76 is in driving connection with the impeller shaft 324. Specifically, the third rotating shaft 76 and the impeller shaft 324 may be connected by magnetic attraction, which is the same as the connection between the first rotating shaft 24 and the impeller shaft 324 in the first embodiment, and will not be described herein. Rotation of the impeller shaft 324 drives rotation of the third shaft 76. The third rotating shaft 76 may be circumferentially provided with bosses having different diameters, and the rotating block 731 and the third rotor base plate 742 are clamped to the different bosses, so as to reduce the sliding of the rotating block 731 or the third rotor base plate 742 along the axial direction of the third rotating shaft 76. Specifically, the rotation block 731 may be mounted to the third boss 761 and the third rotor substrate 742 may be mounted to the fourth boss 762. The third rotation shaft 76 passes through the through hole of the third stator substrate 752. The support sleeve 721 and the third stator base 752 may be fixedly mounted to the support 22, which in the present embodiment is the same as that of the first embodiment. The top of the third rotating shaft 76 is provided with a fourth thimble 764 and the bottom is provided with a third thimble 763, and the two thimbles are respectively inserted into the first jack 222 of the bracket and the second jack 213 of the sealing box to realize the assembly of the third rotating shaft 76. The assembly method of the first rotating shaft is the same as that of the first embodiment, and will not be described in detail herein.

Embodiment four:

fig. 25 is a schematic structural view of a first rotor in the fourth embodiment. As shown in fig. 25, the first rotor may include a rotor support 813 and a plurality of sixth friction plates 812, the rotor support 813 has a plurality of second support plates 8131 radially distributed along an axis of the rotor support 813, and the sixth friction plates 812 are disposed at one end of the second support plates 8131 away from the axis of the rotor support 813 and in one-to-one correspondence with the second support plates 8131, and the sixth friction plates 812 are parallel to an axial direction of the rotor support 813.

Fig. 26 is an assembly view of the first stator and the sixth stator in the fourth embodiment. As shown in fig. 26, the first stator includes a second sleeve 831 and a plurality of eighth electrode pads 832, and the plurality of eighth electrode pads 832 are disposed on an inner wall of the second sleeve 831. The plurality of eighth electrode pads 832 are uniformly distributed along the circumferential direction of the inner wall of the second sleeve 831 with gaps between adjacent ones of the eighth electrode pads 832. The number of sixth friction plates 812 determines how much of the sense signal is generated. In the present embodiment, the number of sixth friction plates 812 is 6. The first rotor is disposed in the second sleeve 831, and the first rotor rotates relative to the second sleeve 831 to drive the sixth friction plate 812 to rub against the eighth electrode plate 832 to generate a sensing signal.

Fig. 27 is a schematic structural view of a fifth stator in the fourth embodiment. Referring to fig. 25 and 27, optionally, the above power generating unit includes a fifth stator 82 and a second magnetic member 811, the fifth stator 82 includes a second body 821 and a second coil 822, the second body 821 is provided with a second accommodating groove 8211, the second coil 822 is located in the second accommodating groove 8211, and the fifth stator 82 is connected to one end of the second sleeve 831. The second magnetic member 811 is disposed between two adjacent sixth friction plates 812 of the rotor bracket 813, and the position of the second magnetic member 811 corresponds to the position of the second coil 822. The first rotor rotates relative to the fifth stator 82 to drive the second magnetic member 811 to move relative to the second coil 822, and the second magnetic member 811 cuts the magnetic induction line of the second coil 822 to generate an electric signal. The generated electrical signal can power the communication unit through the power management unit. In the present embodiment, the number of the second magnetic members 811 and the second coils 822 is 6.

With continued reference to fig. 26. Optionally, the above power generating unit may further include a sixth stator 83, where the sixth stator 83 is disposed on a side facing away from the fifth stator 82 from the second rotor. Specifically, the sixth stator 83 may be fixedly mounted in the second sleeve 831. The sixth stator 83 includes a third body 830 and a third coil 833, the third body 830 is provided with a third accommodating groove 8301, the third coil 833 is located in the third accommodating groove 8301, and the third coil 833 corresponds to the position of the second coil 822. The first rotor rotates relative to the sixth stator 83 to drive the second magnetic member 811 to move relative to the third coil 833, and the second magnetic member 811 cuts the magnetic induction line of the third coil 833 to generate an electric signal. The generated electrical signal can power the communication unit through the power management unit.

Fig. 28 is a schematic structural view of a first rotor, a first stator, a fifth stator, a sixth stator, a bracket, and a seal box in the fourth embodiment. As shown in fig. 28, in the present embodiment, the first rotor rotates with respect to the fifth stator 82 and the sixth stator 83, and the second magnetic member 811 can cut the magnetic induction lines of the second coil 822 and the third coil 833 simultaneously to generate more electric signals than the magnetic induction lines of the second coil 822 on the one side.

The sixth friction plate 812 may be made of Polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), or the like, and is preferably fluorinated ethylene propylene copolymer (FEP). The eighth electrode tab 832 may be made of copper, aluminum, silver, rabbit hair, or the like, preferably copper.

Fig. 29 is a schematic structural view of a fourth shaft in the fourth embodiment. Referring to fig. 28 and 29, the rotor holder 813 is fixedly attached to the fourth rotary shaft 84 by an attachment key 842, and the fourth rotary shaft 84 is in driving connection with the impeller shaft 324. The fourth rotating shaft 84 and the impeller shaft 324 may also be connected by magnetic attraction, which is the same as the connection between the first rotating shaft 24 and the impeller shaft 324 in the first embodiment, and will not be described herein. Rotation of the impeller shaft 324 drives rotation of the fourth shaft 84. The second body 821 and the second sleeve 831 are fixedly mounted to the bracket 22, which in this embodiment has the same structure as the bracket of one of the embodiments. The top of the fourth rotating shaft 84 is provided with a fifth thimble 841 and the bottom is provided with a sixth thimble 843, the fifth thimble 841 is inserted into the first jack 222 of the bracket, and the sixth thimble 843 is inserted into the second jack 213 of the sealing box, so that the fourth rotating shaft 84 is assembled. The assembly method of the first rotating shaft is the same as that of the first embodiment, and will not be described in detail herein.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A self-powered water flow detector is characterized by comprising a shell, a power unit, a sensing unit, a power generation unit, a power management unit and a communication unit, wherein,

the shell is provided with a fluid channel, the power unit is arranged in the fluid channel and comprises an impeller, and fluid in the fluid channel is used for driving the impeller to rotate;

The sensing unit is in transmission connection with the impeller, and the impeller is used for driving the sensing unit to generate a sensing signal;

the power generation unit is in transmission connection with the impeller, and the impeller is also used for driving the power generation unit to generate an electric signal to supply power for the power management unit;

the power management unit is electrically connected with the communication unit and is used for supplying power to the communication unit;

the communication unit is used for collecting the sensing signals and sending the sensing signals to the remote terminal.

2. The self-powered water flow meter of claim 1, wherein the power unit further comprises an impeller box in which the impeller is disposed; the side wall of the impeller box is provided with a through hole, and the fluid flows into the impeller box from the through hole to drive the impeller to rotate.

3. The self-powered water flow meter of claim 2, wherein the sensing unit includes a first rotor and a first stator, the first rotor being drivingly connected to the impeller by a shaft, the first rotor being driven by the impeller to rotate relative to the first stator to generate the sensing signal.

4. The self-powered water flow meter as claimed in claim 3, wherein said first rotor includes a plurality of first friction plates and a first rotor base plate, said first friction plates being disposed on a side of said first stator base plate facing said first stator and distributed along a circumferential direction of said first rotor base plate;

The first stator comprises a first electrode plate, a plurality of second electrode plates and a first stator base plate, and the first electrode plate and the plurality of second electrode plates are arranged on one side of the first stator base plate facing the first friction plate; the plurality of second electrode plates are uniformly distributed along the circumferential direction of the first stator substrate, the first electrode plates are positioned between any two adjacent second electrode plates, and the thickness a of the first electrode plates and the thickness b of the second electrode plates meet a > b;

the first rotor rotates relative to the first stator to drive the first friction plate to be in contact with the first electrode plate so as to transfer charge, and the first friction plate is in non-contact with the second electrode plate to generate the sensing signal.

5. The self-powered water flow meter of claim 4, wherein the power generation unit comprises a second stator and a first magnetic member, the second stator comprising a first body and a first coil, the first body having a first receiving slot, the first coil being positioned in the first receiving slot, the second stator being positioned on a side of the first rotor facing away from the first stator;

the first magnetic piece is arranged on one side of the first rotor base plate facing the second stator, and the position of the first magnetic piece corresponds to the position of the first coil;

The first rotor rotates relative to the second stator to drive the first magnetic member to move relative to the first coil to generate the electrical signal.

6. The self-powered water flow meter as claimed in claim 3, wherein said first rotor includes a base frame having a plurality of first support plates radially distributed along an axis of said base frame, and a plurality of second friction plates disposed at one end of said first support plates away from the axis of said base frame in one-to-one correspondence with said first support plates, said second friction plates being parallel to an axial direction of said base frame;

the first stator comprises a first sleeve and a plurality of third electrode plates, and the third electrode plates are arranged on the inner wall of the first sleeve;

the first rotor is arranged in the first sleeve, and rotates relative to the first stator to drive the second friction plates to sequentially rub each third electrode plate to generate the sensing signals.

7. The self-powered water flow meter of claim 6, wherein the power generation unit comprises a third rotor and a third stator, the third rotor comprising a second rotor base plate and a plurality of third friction plates, the plurality of third friction plates being distributed along a circumferential direction of the second rotor base plate;

The third stator comprises a second stator substrate and a plurality of fourth electrode slices, the fourth electrode slices are uniformly distributed along the circumferential direction of the second stator substrate, and two adjacent fourth electrode slices are electrically connected;

the third rotor rotates relative to the third stator to drive the third friction plate to rub against the fourth electrode plate to generate the electric signal.

8. The self-powered water flow meter as claimed in claim 3, wherein said first rotor includes a rotating block and a plurality of fifth electrode pads disposed on a side wall of said rotating block and arranged in p rows, said fifth electrode pads being positioned in correspondence with each row along an axial direction of said rotating block;

the first stator comprises a fourth friction plate and a plurality of sixth electrode plates, the fourth friction plate is cylindrical, the plurality of sixth electrode plates are arranged on the outer wall of the fourth friction plate, two adjacent sixth electrode plates are arranged in a staggered mode along the axial direction of the fourth friction plate, the sixth electrode plates are arranged in s rows, and s=p;

the first rotor rotates relative to the first stator to drive the fifth electrode plate to rub against the fourth friction plate to generate the sensing signal.

9. The self-powered water flow meter of claim 8, wherein the power generation unit includes a fourth rotor and a fourth stator, the fourth rotor including a third rotor base plate and a plurality of fifth friction plates, the fifth friction plates being distributed along a circumferential direction of the third rotor base plate;

the fourth stator comprises a third stator substrate and a plurality of seventh electrode plates, and the seventh electrode plates are distributed along the circumferential direction of the third stator substrate;

the fourth rotor rotates relative to the fourth stator to drive the fifth friction plate to rub against the seventh electrode plate to generate the electric signal.

10. The self-powered water flow meter as claimed in claim 3, wherein said first rotor includes a rotor support having a plurality of second support plates radially distributed along an axis of said rotor support, and a plurality of sixth friction plates disposed at one end of said second support plates away from said axis of said rotor support and in one-to-one correspondence with said second support plates, said sixth friction plates being parallel to an axial direction of said rotor support;

the first stator comprises a second sleeve and a plurality of eighth electrode plates, and the eighth electrode plates are arranged on the inner wall of the second sleeve;

The first rotor is arranged in the second sleeve, and rotates relative to the second sleeve to drive the sixth friction plate to rub against the eighth electrode plate to generate the sensing signal.

11. The self-powered water flow meter of claim 10, wherein the power generation unit includes a fifth stator and a second magnetic member, the fifth stator including a second body and a second coil, the second body having a second receiving slot, the second coil being positioned in the second receiving slot, the fifth stator being connected to one end of the second sleeve;

the second magnetic piece is arranged between two adjacent sixth friction plates of the rotor bracket, and the position of the second magnetic piece corresponds to the position of the second coil;

the first rotor rotates relative to the fifth stator to drive the second magnetic piece to move relative to the second coil to generate the electric signal.

12. The self-powered water flow meter of claim 11, wherein the power generation unit further comprises a sixth stator disposed on a side of the second rotor facing away from the fifth stator;

The sixth stator comprises a third body and a third coil, the third body is provided with a third accommodating groove, the third coil is positioned in the third accommodating groove, and the third coil corresponds to the second coil in position;

the first rotor rotates relative to the sixth stator to drive the second magnetic piece to move relative to the third coil to generate the electric signal.

13. The self-powered water flow meter of claim 3, wherein the shaft is coupled to the impeller by a magnetic member.

14. The self-powered water flow meter according to any one of claims 1 to 13, wherein the communication unit comprises a single-chip microcomputer and a display module, the single-chip microcomputer being electrically connected to the display module; the battery management unit comprises a rectifying circuit, and the rectifying circuit is electrically connected with the power generation unit.