CN115993154A - A self-powered water flow detector - Google Patents

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

A self-powered water flow detector

technical field

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

Background technique

Fluid flow monitoring is of great practical significance for industrial production, daily life and fluid transportation. Intelligent monitoring sensors are widely used in various pipe networks, such as: urban water supply, agricultural irrigation, industrial transportation, sewage discharge and oil extraction and other fields. The most commonly used traditional flow monitoring sensors are mainly mechanical sensors, and with the introduction of the concept of "smart city", the field of smart sensors is gradually emerging.

The basic purpose of smart sensors is to accurately monitor and record flow information. Therefore, improving the monitoring accuracy is the top priority for improving the level of smart manufacturing and promoting the development of the sensor industry. The instruments used to detect liquids in the prior art require continuous power supply from an external power source, or regular replacement of lithium batteries, to ensure that the instruments can monitor the liquid flow in real time, resulting in high energy consumption.

Contents of the invention

The present application provides a self-powered water flow detector, which can reduce energy consumption while detecting liquid flow.

In order to achieve the above purpose, a self-powered water flow detector provided by the present application includes a housing, a power unit, a sensing unit, a power generation unit, a power management unit and a communication unit, wherein the housing has a fluid channel, and the The power unit is arranged in the fluid channel, and the power unit includes an impeller, and the fluid in the fluid channel is used to drive the impeller to rotate; the sensing unit is connected to the impeller, and the impeller is used to drive The sensing unit generates a sensing signal; the power generation unit is connected to the impeller, and the impeller is also used to drive the power generation unit to generate an electrical signal to supply power to the power management unit; the power management unit is connected to the power management unit The communication unit is electrically connected to provide power for the communication unit; the communication unit is used to collect the sensing signal and send it to a remote terminal.

The above-mentioned self-powered water flow detector can be installed in a fluid pipeline, and the fluid in the fluid pipeline enters the fluid channel of the casing to make the impeller of the power unit rotate. When the impeller is rotating, it is simultaneously driven by the sensing unit and the power generation unit, so that 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 real-time monitoring of the flow of the fluid is realized by monitoring the sensing signal. The electrical signal generated by the power generation unit can supply power to the power management unit, and at the same time the power management unit can also supply power to the communication unit, so that the above self-powered water flow detector realizes self-power supply and saves energy consumption. The communication unit processes the sensor signals collected in real time and converts them into real-time fluid flow data and sends them to the remote terminal.

In an optional technical solution, the power unit further includes 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. Drive the impeller to rotate in the impeller box.

In an optional technical solution, the sensing unit includes a first rotor and a first stator, the first rotor is in transmission connection with the impeller through a rotating shaft, and the first rotor is driven by the impeller to face each other The first stator rotates to generate the sensing signal.

In an optional technical solution, the first rotor includes a plurality of first friction plates and a first rotor base plate, and the first friction plates are arranged on a side of the first stator base plate facing the first stator. side, and distributed along the circumferential direction of the first rotor substrate; the first stator includes a first electrode piece, a plurality of second electrode pieces and a first stator substrate, the first electrode piece and a plurality of The second electrode sheet is arranged on the side of the first stator substrate facing the first friction sheet; a plurality of the second electrode sheets are evenly distributed along the circumferential direction of the first stator substrate, and the first electrode sheet Located between any two adjacent second electrode sheets, the thickness a of the first electrode sheet and the thickness b of the second electrode sheet satisfy a>b; the first rotor is relatively The first stator rotates to drive the first friction plate to contact the first electrode plate to realize charge transfer, and the first friction plate is not in contact with the second electrode plate to generate the sensing signal.

In an optional technical solution, the power generation unit includes a second stator and a first magnetic member, the second stator includes a first body and a first coil, the first body is provided with a first accommodation slot, and the The first coil is located in the first accommodating slot, and the second stator is located on a side of the first rotor away from the first stator. The first magnetic part is disposed on a side of the first rotor substrate facing the second stator, and a position of the first magnetic part corresponds to a 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 electric signal.

In an optional technical solution, the first rotor includes a base frame and a plurality of second friction plates, the base frame has a plurality of first support plates radially distributed along the axis of the base frame, the The second friction plate is arranged on the end of the first support plate away from the axis of the base frame and corresponds to the first support plate one by one, and the second friction plate is parallel to the axial direction of the base frame . The first stator includes a first sleeve and a plurality of third electrode sheets, and the plurality of third electrode sheets are arranged on the inner wall of the first sleeve. The first rotor is arranged in the first sleeve, and the first rotor rotates relative to the first stator to drive the second friction plate to rub against each of the third electrode plates in turn to generate the the sensing signal.

In an optional technical solution, the power generation unit includes a third rotor and a third stator, and the third rotor includes a second rotor base plate and a plurality of third friction plates, and the plurality of third friction plates are arranged along the Circumferential distribution of the second rotor base plate. The third stator includes a second stator base plate and a plurality of fourth electrode slices, the plurality of fourth electrode slices are evenly distributed along the circumferential direction of the second stator base plate, and two adjacent fourth electrode slices electrical connection between. 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 solution, the first rotor includes a rotating block and a plurality of fifth electrode sheets, and the plurality of fifth electrode sheets are arranged on the side wall of the rotating block and arranged in p rows, along the The axial direction of the rotating block corresponds to the position of each row of the fifth electrode piece. The first stator includes a fourth friction sheet and a plurality of sixth electrode sheets, the fourth friction sheet is cylindrical, and the plurality of sixth electrode sheets are arranged on the outer wall of the fourth friction sheet, and Along the axial direction of the fourth friction sheet, two adjacent sixth electrode sheets are arranged alternately, and the sixth electrode sheets are arranged in s rows, 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 optional technical solution, the power generation unit includes a fourth rotor and a fourth stator, the fourth rotor includes a third rotor base plate and a plurality of fifth friction plates, and the fifth friction plates are along the third rotor base plate the circumferential distribution. The fourth stator includes a third stator base plate and a plurality of seventh electrode slices, and the plurality of seventh electrode slices are distributed along the circumferential direction of the third stator base plate. 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 electrical signal. In an optional technical solution, the first rotor includes a rotor bracket and a plurality of sixth friction plates, the rotor bracket has a plurality of second support plates radially distributed along the axis of the rotor bracket, the The sixth friction plate is arranged on the end of the second support plate away from the axis of the rotor support and corresponds to the second support plate one by one, and the sixth friction plate is parallel to the axial direction of the rotor support . The first stator includes a second sleeve and a plurality of eighth electrode sheets, and the plurality of eighth electrode sheets are arranged on the inner wall of the second sleeve. The first rotor is arranged in the second sleeve, and the first rotor rotates relative to the second sleeve to drive the sixth friction plate to rub against the eighth electrode plate to generate the sensor Signal.

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

In an optional technical solution, the power generation unit further includes a sixth stator, and the sixth stator is arranged on a side of the second rotor away from the fifth stator. The sixth stator includes a third body and a third coil, the third body is provided with a third accommodating slot, the third coil is located in the third accommodating slot, the third coil and the The position of the second coil corresponds. The first rotor rotates relative to the sixth stator to drive the second magnetic member to move relative to the third coil to generate the electric signal.

In an optional technical solution, the rotating shaft is magnetically connected to the impeller through a magnetic member.

In an optional technical solution, the communication unit includes a single-chip microcomputer and a display module, and the single-chip microcomputer is electrically connected to the display module; the battery management unit includes a rectification circuit, and the rectification circuit is electrically connected to the power generation unit.

Description of drawings

Fig. 1 is a kind of structural representation of the self-powered water flow detector provided by the embodiment of the present application;

Fig. 2 is a schematic diagram of the shell structure of the self-powered water flow detector provided by the embodiment of the present application;

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

Fig. 4 is the structural representation of the impeller box of the embodiment of the present application;

FIG. 5 is a schematic structural diagram of a sealed box according to an embodiment of the present application;

Figure 6 is a schematic structural view of the first rotor in Embodiment 1;

FIG. 7 is a schematic structural view of the first stator in Embodiment 1;

Fig. 8 is a schematic structural view of the second stator in Embodiment 1;

FIG. 9 is a structural schematic diagram of another angle of the first rotor substrate in Embodiment 1;

Fig. 10 is a schematic structural diagram of a stent in an embodiment of the present application;

Fig. 11 is a schematic structural view of the first rotating shaft in Embodiment 1;

Fig. 12 is an assembly diagram of the first stator, the second stator, the first rotor, the bracket and the sealing box in the first embodiment;

Fig. 13 is a schematic structural diagram of the first rotor in Embodiment 2;

Fig. 14 is a schematic structural view of the first stator in the second embodiment;

Fig. 15 is a schematic structural diagram of the third rotor in Embodiment 2;

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

Fig. 17 is a schematic structural view of the second rotating shaft in the second embodiment;

Fig. 18 is an assembly drawing of the first rotor, the first stator, the third rotor, the third stator, the bracket and the sealing box in the second embodiment;

Fig. 19 is a schematic structural view of the first rotor in Embodiment 3;

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

Fig. 21 is a schematic structural view of the fourth rotor in Embodiment 3;

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

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

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

Fig. 25 is a schematic structural diagram of the first rotor in Embodiment 4;

Fig. 26 is an assembly drawing of the first stator and the sixth stator in the fourth embodiment;

Fig. 27 is a schematic structural view of the fifth stator in Embodiment 4;

Fig. 28 is a schematic structural view of the first rotor, the first stator, the fifth stator, the sixth stator, the bracket, the fourth rotating shaft, and the sealing box in Embodiment 4;

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

Reference signs:

1-housing; 2-power unit; 17-fluid channel; 31-impeller box; 32-impeller; 312-inlet hole; 324-impeller shaft; 322-blade; 21-sealing box; ; 15-accommodating cavity; 12-top cover; 13-top cover glass;

242-the first friction plate; 243-the first rotor substrate; 232-the second electrode piece; 231-the first electrode piece; 234-the first stator substrate; 25-the second stator; 245-the first magnetic part; 251 -first body; 252-first coil; 22-bracket; 221-bracket top plate; 225-bracket bottom plate; 2251-center hole; 223-thinner part; A thimble; 2414-the second thimble; 222-the first jack; 213-the second jack; 244-the first ring magnet; 321-the second ring magnet; 212-the first card slot;

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

731-rotating block; 733-fifth electrode sheet; 722-fourth friction sheet; 723-sixth electrode sheet; 74-fourth rotor; 75-fourth stator; 742-third rotor base plate; 741-fifth friction 752-the third stator base plate; 751-the seventh electrode sheet; 721-support sleeve; 76-the third rotating shaft; 761-the third boss; 762-the fourth boss; 763-the third thimble; fourth thimble;

813-rotor bracket; 812-sixth friction plate; 8131-second support plate; 831-second sleeve; 832-eighth electrode piece; 82-fifth stator; 811-second magnetic part; 821-second Body; 822-second coil; 8211-second storage slot; 83-sixth stator; 833-third coil; 830-third body; 8301-third storage slot; 84-fourth shaft; 841- Fifth thimble; 843-sixth thimble; 842-installation key.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present 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 a self-powered water flow detector provided in an embodiment of the present application, and Fig. 3 is a schematic diagram of a self-powered water flow detector provided in an embodiment of the present application Schematic diagram of the power unit. Please refer to Figures 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. Wherein, the housing 1 has a fluid passage 17, and the power unit 2 is disposed on the fluid passage 17. The power unit 2 includes an impeller 32, and the fluid in the fluid passage 17 is used to drive the impeller 32 to rotate. The above-mentioned sensing unit is in transmission connection with the impeller 32, and the impeller 32 is used to drive the sensing unit to generate a sensing signal. The above power generation unit is in drive connection with the impeller 32, and the impeller 32 is also used to drive the power generation unit to generate electrical signals to supply power to the power management unit. The above-mentioned power management unit is electrically connected with the communication unit for supplying power to the communication unit. The above-mentioned communication unit is used to collect sensing signals and send them to the remote terminal.

The above-mentioned self-powered water flow detector can be installed in a fluid pipeline, and the fluid in the fluid pipeline enters the fluid channel 17 of the casing 1 to make the impeller 32 of the power unit 2 rotate. During the rotation process, the impeller 32 is simultaneously driven by the sensing unit and the power generation unit, so that 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 real-time monitoring of the flow of the fluid is realized by monitoring the sensing signal. The electrical signal generated by the power generation unit can supply power to the power management unit, and at the same time the power management unit can also supply power to the communication unit, so that the above self-powered water flow detector realizes self-power supply and saves energy consumption. The communication unit processes the sensor signals collected in real time and converts them into real-time fluid flow data and sends them to the remote terminal.

In an optional embodiment, the above-mentioned communication unit (not shown in the figure) may include a single-chip microcomputer, a wireless communication module and a display module. The single chip microcomputer is electrically connected with the display module. Wherein, the single-chip microcomputer may be a 51 series single-chip microcomputer, an STM32 series single-chip microcomputer, and the like. The wireless communication module can be a Bluetooth module, a distance wireless communication module (LoRa), a single-chip radio frequency transceiver module (nRF24L01), etc. Specifically, the single-chip microcomputer may adopt a single-chip microcomputer with STM32F103 as the core chip. The wireless communication module adopts nRF24L01. The single-chip microcomputer converts the analog signal output by the sensing unit into a digital signal and controls the wireless communication module to send the digital signal to the remote terminal, thereby realizing real-time monitoring of the fluid flow. Alternatively, the single-chip microcomputer converts the analog signal output by the sensing unit into a digital signal and then directly transmits it to the display module for display.

In an optional embodiment, the above-mentioned power management unit may include a rectification circuit, a DC-DC conversion circuit, a full control switch circuit and a battery. The types of rectification circuits include half-wave rectification circuits, full-wave rectification circuits, bridge rectification circuits, and voltage doubler rectification circuits. Specifically, the core of the rectification circuit is a bridge rectification circuit. The battery uses a 18650 rechargeable lithium battery as the core. The full control switch circuit adopts a full control switch with MOS tube 2N7000 as the core. The power generation unit converts the output AC signal into DC power through the bridge rectifier circuit, and the DC-DC conversion circuit converts the DC power, and distributes the converted electrical signal through the full control switch. When the power demand of the communication unit is large, the battery It will be supplemented to realize active collaborative power supply.

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

Fig. 5 is a schematic structural diagram of a sealed box according to an embodiment of the present application. As shown in Figure 5, in an optional embodiment, the above-mentioned self-powered water flow detector may also include a sealed box 21, and the above-mentioned power unit 2, sensing unit, power generation unit, communication unit and power management unit are installed in the sealed box 21. Box 21, to avoid being damaged by fluid immersion.

FIG. 3 is a schematic structural diagram of a power unit according to an embodiment of the present application, and FIG. 4 is a schematic structural diagram of an impeller box according to an embodiment of the present application. As shown in FIG. 3 and FIG. 4 , in an optional embodiment, the aforementioned power unit may further include an impeller box 31 , and the impeller 32 is disposed in the impeller box 31 . The side wall of the impeller box 31 is provided with a liquid inlet hole 312 , and the fluid flows into the impeller box 31 from the liquid inlet hole 312 to drive the impeller 32 to rotate. Specifically, the above-mentioned impeller box 31 may be a cylindrical cavity. The impeller 32 includes an impeller shaft 324 and blades 322 disposed along the circumference of the impeller shaft 324 , and the blades 322 are radially arranged. The impeller 32 is arranged concentrically with the impeller box 31 . The liquid inlet hole 312 can be a tangential hole, that is, the direction of the liquid inlet hole 312 has a certain angle with the impeller shaft 324, so that when the fluid enters the impeller box 31 from the liquid inlet hole 312, it can rush towards the blade 322 of the impeller 32 instead of Rush toward the impeller shaft 324 to reduce the impediment of the rotation of the impeller 32 .

Please continue to refer to FIG. 2 , in an optional embodiment, the housing 1 has an accommodating cavity 15 , and the sealing box 21 can be disposed in the accommodating cavity 15 . The fluid channel 17 is located at one end of the accommodation chamber 15 and communicates with the accommodation chamber 15 . The impeller box 31 is disposed in the fluid channel 17 . The top of the impeller box 31 is docked with the bottom of the sealing box 21 . The casing 1 also includes a top cover 12 and a top cover glass 13 . The top cover glass 13 is embedded in the top cover 12 . The top cover 12 is disposed on the top of the accommodating chamber 15 .

In an optional embodiment, the sensing unit may include a first rotor and a first stator, and the first rotor is in drive connection with the impeller 32 through a rotating shaft. Specifically, the first rotor is opposite to the first stator and arranged concentrically. Driven by the impeller, the first rotor rotates relative to the first stator to generate sensing signals.

In an optional embodiment, the above-mentioned connection between the rotating shaft and the impeller may be magnetically connected by magnetic components.

The structure and different combination forms of the sensing unit and the generating unit will be described in detail below with reference to different embodiments.

Embodiment one:

Fig. 6 is a schematic structural diagram of the first rotor in the first embodiment. As shown in FIG. 6 , the sensing unit may include a first rotor and a first stator. The above-mentioned first rotor includes a plurality of first friction plates 242 and a first rotor base plate 243, and the first rotor base plate 243 may be circular. The first friction plates 242 are disposed on a side of the first rotor base plate 243 facing the first stator, and are evenly distributed along the circumferential direction of the first rotor base plate 243 .

Fig. 7 is a schematic structural diagram of the first stator in the first embodiment. As shown in FIG. 7 , the first stator includes a first electrode piece 231 , a plurality of second electrode pieces 232 and a first stator base plate 234 . The first electrode piece 231 and a plurality of second electrode pieces 232 are arranged on the side of the first stator substrate 234 facing the first friction piece 242, and the first electrode piece 231 and the second electrode piece 232 are connected with any one of the first friction pieces 242 are positioned so that the first friction plate 242 can be in contact with the first electrode plate 231 when the first stator and the first rotor rotate relative to each other. The plurality of second electrode pieces 232 are evenly distributed along the circumferential direction of the first stator substrate 234 . The first electrode sheet 231 is located between any two adjacent second electrode sheets 232 . The thickness a of the first electrode sheet 231 and the thickness b of the second electrode sheet 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 at the same time, the first friction plate 242 and the second electrode plate 232 rotate relative to each other without contact to generate a sensing signal.

The two adjacent second electrode sheets 232 constitute a pair of electrodes. Since the thickness of the first electrode piece 231 is greater than that of the second electrode piece 232, when the first rotor rotates, the above-mentioned first electrode piece 231 is in contact with the first friction piece 242, and the second electrode piece 232 is in contact with the first friction piece 242. The friction sheet 242 is in a non-contact state. When the first rotor rotates, firstly, the first electrode sheet 231 is in contact with the first friction sheet 242 to realize charge transfer between the first electrode sheet 231 and the first friction sheet 242 , so that the first friction sheet 242 is negatively charged. Then, the first friction piece 242 continues to rotate, and when passing the second electrode piece 232 , the electric charges of the first friction piece 242 and the second electrode piece 232 are transferred, so that the second electrode piece 232 is positively charged to generate a sensing signal. The first electrode sheet 231 can supplement charges for the second electrode sheet 232 . The above non-contact mode improves the durability of the second electrode piece 232 and reduces the friction and wear of the second electrode piece 232 so as to increase the service life of the first stator. Moreover, the monitoring accuracy is improved.

Further, the second electrode sheet 232 has the same shape and the same area as the first electrode sheet 231 . The first stator substrate 234 may be circular, and the first electrode slices 231 and the second electrode slices 232 may be fan-shaped.

When specifically selecting the materials of the above-mentioned first electrode sheet 231, the second electrode sheet 232 and the first friction sheet 242, conductive materials such as copper, aluminum, silver, rabbit hair can be selected as the material of the first electrode sheet 231; copper, aluminum Conductive materials such as silver and silver are used as the material of the second electrode sheet 232; polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), etc. are used as the material of the first friction sheet. In the above embodiment, it is preferred that rabbit hair is used as the material of the first electrode sheet 231 , copper is used as the material of the second electrode sheet 232 , and polytetrafluoroethylene (PTFE) is used as the material of the first friction sheet 242 . The selection of the above materials can achieve the effect of generating a relatively stable electrical signal.

FIG. 8 is a schematic structural view of the second stator in the first embodiment, and FIG. 9 is a schematic structural view of the first rotor substrate in the first embodiment from another angle. Please refer to FIG. 8 and FIG. 9, the power generation unit may include a second stator 25 and a first magnetic member 245, the second stator includes a first body 251 and a first coil 252, the first body 251 is provided with a first accommodation slot, The first coil 252 is located in the first accommodating slot. The second stator 25 is located on the side of the first rotor away from the first stator. The first magnetic part 245 is disposed on the side of the first rotor base plate 243 facing the second stator, and the position of the first magnetic part 245 corresponds to the position of the first coil 252 . Specifically, the number of the first magnetic parts 245 may be consistent with the number of the first coils 252. In this embodiment, six first magnetic parts 245 are used, and six coils 252 are correspondingly provided. 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 field lines of the first coil 252 to generate an electric signal. The generated electrical signal is capable of powering the communication unit via the power management unit.

Fig. 10 is a schematic structural view of the bracket in the first embodiment, and Fig. 12 is an assembly diagram of the first stator, the second stator, the first rotor, the bracket and the sealing box in the first embodiment. As shown in Figure 10 and Figure 12, further, the self-powered water flow detector can also include a bracket 22, the bracket 22 includes a bracket top plate 221 and a bracket bottom plate 225, and the edge of the bracket top plate 221 opposite to the bracket bottom plate 225 is provided with a bracket beam . The thinner part 223 at the upper end of the support beam can be used for installing the first stator base plate 234 , and the thicker part 224 at the lower end of the support beam is used for installing the first body 251 . In order to stabilize the installation of the first stator base plate 234 and the first body 251 , three support beams may be provided. Correspondingly, the first stator base plate 234 and the first body 251 are provided with installation holes corresponding to the positions of the support beams.

Fig. 11 is a schematic structural view of the first rotating shaft in the first embodiment. Referring to Figure 10, Figure 11 and Figure 5, the first rotor is fixed on the bracket 22 through the first rotating shaft 24, specifically, the first rotating shaft 24 may include a first thimble 2411 at the top of the rotating shaft and a second thimble at the bottom of the rotating shaft 2414. A first insertion hole 222 is provided at the center of the bracket top plate 221 . The bottom of the sealing box 21 is provided with a second insertion hole 213 . The first thimble 2411 is inserted into the first socket 222, and the second thimble 2414 is inserted into the second socket 213. The side wall of the rotating shaft is also provided with a rotor installation key 2412, and the first rotor base plate 243 is fixed to the first rotating shaft 24 through the installation key 2412. , so that the first rotor base plate 243 rotates together with the first rotating shaft 24 .

Please continue to refer to FIG. 3 , FIG. 5 , and FIG. 6 . The end of the first rotating shaft 24 close to 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 rotating shaft 24 extends downward through the central hole 2251 of the bottom plate 225 of the bracket. The first ring magnet 244 is disposed in the first slot 212 at the bottom of the sealing box 21 facing inward. The second ring magnet 321 is sheathed on the second clamping block 215 at the bottom of the sealing box 21 facing outward. The first ring magnet 244 and the lower second ring magnet 321 are attracted to each other, so that the first rotating shaft 24 is connected to the impeller shaft 324 through transmission.

Embodiment two:

Fig. 13 is a schematic structural diagram of the 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 plate 623 is arranged on the end of the first support plate 621 away from the axis of the base frame, and is connected to the first support plate 621. There is a one-to-one correspondence between the boards 621 . The second friction plate 623 is parallel to the axial direction of the base frame 62 .

Fig. 14 is a schematic structural view of the 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 disposed on the inner wall of the first sleeve 632 . The first rotor is disposed in the first sleeve 632 , and rotates relative to the first stator to drive the second friction plate 623 to rub against each third electrode plate 631 in turn to generate a sensing signal.

The material of the second friction plate 623 may be polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP) and the like. Preferably, the material of the second friction plate 623 is fluorinated ethylene propylene copolymer (FEP). Its tensile strength, abrasion resistance, and 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. Since the second friction plate 623 is relatively soft, when the first rotor is installed 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 relatively small. Large, which in turn makes the generated sensing signal more accurate.

Optionally, the third electrode sheet 631 may be an interdigital electrode, and two adjacent third electrode sheets 631 form a pair of electrodes. The number of the third electrode pieces 631 is k, the number of k determines the accuracy of the sensing signal, the higher the value of k, the higher the monitoring accuracy. The range of K can be 2<k<1000. In this embodiment, k=12. The material of the third electrode sheet 631 can be copper, aluminum, silver, rabbit hair, etc., preferably copper.

Fig. 15 is a schematic structural diagram of the third rotor in the second embodiment, and Fig. 16 is a schematic structural diagram of the third stator in the second embodiment. As shown in Figures 15 and 16, optionally, the power generation unit may include a third rotor 64 and a third stator 65, the third rotor 64 includes a second rotor base plate 642 and a plurality of third friction plates 641, and the plurality of third friction plates The slices 641 are evenly distributed along the circumferential direction of the second rotor base plate 642 . The third stator 65 includes a second stator base plate 652 and a plurality of fourth electrode slices 651 , and the plurality of fourth electrode slices 651 are evenly distributed along the circumferential direction of the second stator base plate 652 . Two adjacent fourth electrode sheets 651 are electrically connected to form a pair of electrodes. The third rotor 64 rotates relative to the third stator 65 to drive the third friction plate 641 to rub against the fourth electrode plate 651 to generate electrical signals.

Optionally, the number m of the third friction sheets 641 and the number n of the fourth electrode sheets 651 satisfy n=4m. Specifically, the total area of the plurality of third friction plates 641 determines how many electrical signals are generated. In this embodiment, m=6. Two adjacent fourth electrode sheets 651 form a pair of electrodes, and the pair of electrodes are two equally spaced electrodes. The output performance of equidistant electrodes is higher than that of equiangular electrodes, and the power generation of two equidistant electrodes is higher than that of equiangular arrangement between electrode sheets.

Optionally, any two adjacent fourth electrode sheets 651 above constitute a pair of electrodes. In this embodiment, there are 24 fourth electrode sheets 651, so there are 12 pairs of electrodes. The two fourth electrode sheets 651 of the spaced pair of electrodes are electrically connected. That is to say, any pair of electrodes is selected as the first pair of electrodes, and arranged in a clockwise direction as the second pair of electrodes, the third pair of electrodes, the fourth pair of electrodes, and so on. Wherein, if the two fourth electrode pieces of the first pair of electrodes are electrically connected, then the two fourth electrode pieces of the third, fifth, seventh, ninth and eleventh pair of electrodes are also electrically connected. Charge transfer can be performed between the two electrically connected fourth electrode sheets 651 .

When specifically selecting the material of the third friction plate 641, polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), etc. can be selected, preferably polytetrafluoroethylene (PTFE). PTFE has the advantages of high temperature resistance and low friction coefficient. The material of the fourth electrode sheet can be copper, aluminum, silver, rabbit hair, etc., preferably copper.

Fig. 17 is a schematic structural view of the second rotating shaft in the second embodiment, and Fig. 18 is an assembly diagram of the first rotor, the first stator, the third rotor, the third stator, the bracket and the sealing box in the second embodiment. As shown in FIG. 17 and FIG. 18 , the base frame 62 and the second rotor base plate 642 are fixedly installed on the second rotating shaft 61 through the installation key, and can rotate together with the second rotating shaft 61 . The second rotating shaft 61 is in transmission connection with the impeller shaft 324 . Specifically, the second rotating shaft 61 and the impeller shaft can 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 Embodiment 1, and will not be repeated here. Bosses with different diameters can be provided in the circumferential direction of the rotating shaft, and the base frame 62 and the second rotor base plate 642 are clamped on different bosses to reduce the situation where the base frame 62 or the second rotor base plate 642 slides along the axial direction of the thinking rotating shaft 61 . Specifically, the base frame 62 can be installed on the first boss 612 , and the second rotor base plate 642 can be installed on the second boss 613 . The second stator base plate 652 and the first sleeve 632 can be fixedly installed on the bracket 22 , and the bracket in this embodiment has the same structure as that 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 socket 222 of the bracket, and the second thimble 614 is inserted into the second socket 213 of the sealed box to realize the second thimble. The assembly of the two rotating shafts 61. The assembly of the second rotating shaft 61 , the bracket and the sealing box is the same as that of the first rotating shaft in Embodiment 1, and will not be repeated here.

Embodiment three:

Fig. 19 is a schematic structural diagram of the first rotor in the third embodiment. As shown in FIG. 19 , the above sensing unit may include a first rotor and a first stator. The first rotor may include a rotating block 731 and a plurality of fifth electrode pieces 733, and the rotating block 731 may be a cylinder. A plurality of fifth electrode sheets 733 are disposed on the sidewall of the rotating block 731 and arranged in p rows, and each row of fifth electrode sheets 733 corresponds to a position along the axial direction of the rotating block 731 . Specifically, the above p=3. A plurality of fifth electrode sheets 733 are arranged in three rows. The fifth electrode sheet of each row corresponds to the position of the fifth electrode sheet of an adjacent row. That is, each column has three fifth electrode sheets 733 .

Figure 20 is a schematic structural view of the first stator in Embodiment 3. As shown in Figure 20, the first stator includes a fourth friction plate 722 and a plurality of sixth electrode plates 723, and the fourth friction plate 722 is cylindrical. A plurality of sixth electrode sheets 723 are arranged on the outer wall of the fourth friction sheet 722, and along the axial direction of the fourth friction sheet 722, two adjacent sixth electrode sheets are arranged alternately, and the sixth electrode sheets are arranged in s rows, s=p. In this embodiment, s=p=3. The sixth electrode sheet 723 in each row is one phase, and the first stator has three phase electrodes in total, and there is a certain phase difference between the electrodes of each phase. The three-phase electrodes use a phase difference of Q degrees to improve the resolution of fluid flow detection. In this embodiment, Q=30°. The first rotor rotates relative to the first stator to drive the fifth electrode sheet 733 to rub against the fourth friction sheet 722 to generate a sensing signal.

The material of the fourth friction plate 722 may be polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), etc., preferably polytetrafluoroethylene (PTFE). The material of the sixth electrode sheet 723 can be copper, aluminum, silver, rabbit hair, etc., preferably copper. The material of the fifth electrode piece 733 can be gold, copper, aluminum, silver, rabbit hair, etc., preferably copper.

Fig. 21 is a schematic structural diagram of the fourth rotor in the third embodiment, and Fig. 22 is a schematic structural diagram of the fourth stator in the third embodiment. As shown in FIG. 21 and FIG. 2 , optionally, the above power generation unit may include a fourth rotor 74 and a fourth stator 75, the fourth rotor 74 includes a third rotor base plate 742 and a plurality of fifth friction plates 741, the fifth friction plates 741 are evenly distributed along the circumferential direction of the third rotor base plate 742 . The fourth stator includes a third stator base plate 752 and a plurality of seventh electrode slices 751 , and the plurality of seventh electrode slices 751 are distributed in the circumferential direction of the third stator base plate. The fourth rotor 74 rotates relative to the fourth stator 75 to drive the fifth friction plate 741 to rub against the seventh electrode plate 751 to generate electrical signals.

The material of the fifth friction plate 741 includes polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), rabbit hair, wood, fabric, etc., preferably rabbit hair.

In this embodiment, the number of the above-mentioned seventh electrode sheets 751 may be 32. The number of the fifth friction plates 741 is four. The above-mentioned two adjacent seventh electrode sheets 751 form a pair of electrodes, and the seventh electrode sheets 751 can achieve a low peak factor and effectively increase the average power through parallel connection, phase difference rectification and stacking. The fifth friction sheet 741 can cover four seventh electrode sheets 751 . The width of the fifth friction sheet 741 is greater than that of the seventh electrode sheet 751 . The two seventh electrode sheets 751 of the spaced pair of electrodes are electrically connected, which is the same as the electrical connection relationship of the fourth electrode sheet in the second embodiment.

Please continue to refer to FIG. 20 , the above-mentioned first stator also includes a support sleeve 721, and the fourth friction plate 722 is installed on the support sleeve 721. Specifically, the sixth electrode piece 723 is arranged on the support sleeve 721 and the fourth friction plate 722. between.

Fig. 23 is a schematic structural diagram of the third rotating shaft in the third embodiment, and Fig. 24 is a schematic structural diagram of the first rotor, the first stator, the fourth rotor, the fourth stator, the third rotating shaft, the bracket and the sealing box in the third embodiment. Please refer to FIG. 23 and FIG. 24 , the rotating block 731 and the third rotor base plate 742 are fixedly installed on the third rotating shaft 76 through the installation key. The third rotating shaft 76 is in driving connection with the impeller shaft 324 . Specifically, the third rotating shaft 76 and the impeller shaft 324 can 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 Embodiment 1, and will not be repeated here. The impeller shaft 324 rotates to drive the third rotating shaft 76 to rotate. Bosses with different diameters can be provided in the circumferential direction of the third rotating shaft 76, and the rotating block 731 and the third rotor base plate 742 are clamped on different bosses to reduce the axis of the rotating block 731 or the third rotor base plate 742 along the third rotating shaft 76. The case of swiping in a direction. Specifically, the rotating block 731 can be installed on the third boss 761 and the third rotor base plate 742 can be installed on the fourth boss 762 . The third rotating shaft 76 passes through the through hole of the third stator base plate 752 . The supporting sleeve 721 and the third stator base plate 752 can be fixedly installed on the bracket 22 , and the bracket in this embodiment has the same structure as that in 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 socket 222 of the bracket and the second socket 213 of the sealing box to realize the third rotating shaft 76. assembly. The assembly method of the first rotating shaft is the same as that in the first embodiment, and will not be repeated here.

Embodiment four:

Fig. 25 is a schematic structural diagram of the first rotor in the fourth embodiment. As shown in Figure 25, the above-mentioned first rotor may include a rotor bracket 813 and a plurality of sixth friction plates 812, the rotor bracket 813 has a plurality of second support plates 8131 radially distributed along the axis of the rotor bracket 813, and the sixth friction plates The piece 812 is arranged on the end of the second support plate 8131 away from the axis of the rotor bracket 813 and corresponds to the second support plate 8131 one by one. The sixth friction plate 812 is parallel to the axial direction of the rotor bracket 813 .

Fig. 26 is an assembly diagram 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 pieces 832 , and the plurality of eighth electrode pieces 832 are disposed on the inner wall of the second sleeve 831 . A plurality of eighth electrode sheets 832 are evenly distributed along the inner wall of the second sleeve 831 in the circumferential direction, and there is a gap between two adjacent eighth electrode sheets 832 . The number of the sixth friction plates 812 determines how many sensing signals are generated. In this embodiment, there are six sixth friction plates 812 . 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 the fifth stator in the fourth embodiment. Referring to Fig. 25 and Fig. 27, optionally, the above power generation 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, and the second body 821 is provided with a second container The second coil 822 is located in the second accommodating slot 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 support 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 field lines of the second coil 822 to generate an electrical signal. The generated electrical signal is capable of powering the communication unit via the power management unit. In this embodiment, there are six second magnetic members 811 and six second coils 822 .

Continue to refer to FIG. 26 . Optionally, the above-mentioned power generation unit may further include a sixth stator 83 , and the sixth stator 83 is disposed on a side of the second rotor away from the fifth stator 82 . Specifically, the sixth stator 83 can be fixedly installed 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 accommodation slot 8301, the third coil 833 is located in the third accommodation slot 8301, the third coil 833 and the second coil 822 corresponding to the position. 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 field lines of the third coil 833 to generate an electrical signal. The generated electrical signal is capable of powering the communication unit via the power management unit.

Fig. 28 is a schematic structural view of the first rotor, the first stator, the fifth stator, the sixth stator, the bracket and the sealing box in the fourth embodiment. As shown in FIG. 28, in this embodiment, the first rotor rotates relative to the fifth stator 82 and the sixth stator 83, and the second magnetic member 811 can simultaneously cut the magnetic field lines of the second coil 822 and the third coil 833 to generate The electrical signal generated by the magnetic field lines of the second coil 822 that only cuts one side is more than the electrical signal generated.

The material of the sixth friction plate 812 may be polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), etc., preferably fluorinated ethylene propylene copolymer (FEP). The material of the eighth electrode sheet 832 can be copper, aluminum, silver, rabbit hair, etc., preferably copper.

Fig. 29 is a schematic structural view of the fourth rotating shaft in the fourth embodiment. Referring to FIG. 28 and FIG. 29 , the above-mentioned rotor bracket 813 is fixedly installed on the fourth rotating shaft 84 through the installation key 842 , and the fourth rotating shaft 84 is connected to the impeller shaft 324 in transmission. The fourth rotating shaft 84 and the impeller shaft 324 can 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 repeated here. The impeller shaft 324 rotates to drive the fourth rotating shaft 84 to rotate. The second body 821 and the second sleeve 831 are fixedly mounted on the bracket 22 , and the bracket in this embodiment has the same structure as the bracket in the first embodiment. The top of the fourth rotating shaft 84 is provided with a fifth thimble 841 and a sixth thimble 843 at the bottom. The fifth thimble 841 is inserted into the first socket 222 of the bracket, and the sixth thimble 843 is inserted into the second socket 213 of the sealed box to realize the second thimble. Assembly of the four rotating shafts 84. The assembly method of the first rotating shaft is the same as that in the first embodiment, and will not be repeated here.

In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. are based on the orientation or positional relationship shown in the drawings, and are only In order to facilitate the description of the present application and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (14)

1. A self-powered water flow detector, characterized in that it comprises a housing, a power unit, a sensing unit, a power generation unit, a power management unit and a communication unit, wherein, The housing has a fluid channel, the power unit is arranged in the fluid channel, the power unit includes an impeller, and the fluid in the fluid channel is used to drive the impeller to rotate; The sensing unit is in transmission connection with the impeller, and the impeller is used to drive the sensing unit to generate a sensing signal; The power generation unit is connected to the impeller in transmission, and the impeller is also used to drive the power generation unit to generate an electrical signal to supply power to the power management unit; The power management unit is electrically connected to the communication unit, and is used to supply power to the communication unit; The communication unit is used to collect the sensing signal and send it to a remote terminal. 2. The self-powered water flow detector according to claim 1, wherein the power unit also includes an impeller box, and the impeller is arranged in the impeller box; the side wall of the impeller box is provided with a through The fluid flows into the impeller box from the through hole to drive the impeller to rotate. 3. The self-powered water flow detector according to claim 2, wherein the sensing unit comprises a first rotor and a first stator, and the first rotor is connected to the impeller through a rotating shaft, so that The first rotor is driven by the impeller to rotate relative to the first stator to generate the sensing signal. 4. The self-powered water flow detector according to claim 3, wherein the first rotor comprises a plurality of first friction plates and a first rotor base plate, and the first friction plates are arranged on the first The stator base plate faces one side of the first stator and is distributed along the circumferential direction of the first rotor base plate; The first stator includes a first electrode slice, a plurality of second electrode slices and a first stator substrate, and the first electrode slice and the plurality of second electrode slices are arranged on the first stator substrate facing the One side of the first friction sheet; a plurality of the second electrode sheets are evenly distributed along the circumferential direction of the first stator substrate, and the first electrode sheet is located between any adjacent two of the second electrode sheets , the thickness a of the first electrode sheet and the thickness b of the second electrode sheet satisfy a>b; The first rotor rotates relative to the first stator to drive the first friction plate to contact the first electrode plate to transfer charge, and the first friction plate is not in contact with the second electrode plate The sensing signal is generated. 5. The self-powered water flow detector according to claim 4, wherein the power generating unit comprises a second stator and a first magnetic member, the second stator comprises a first body and a first coil, and the The first body is provided with a first accommodating slot, the first coil is located in the first accommodating slot, and the second stator is located on a side of the first rotor away from the first stator; The first magnetic part is arranged on the side of the first rotor substrate facing the second stator, and the position of the first magnetic part 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 electric signal. 6. The self-powered water flow detector of claim 3, wherein said first rotor includes a base frame and a plurality of second friction plates, said base frame having a plurality of axes along said base frame The center of the first support plate is radially distributed, the second friction plate is arranged on the end of the first support plate away from the axis of the base frame and corresponds to the first support plate one by one, the second friction plate The friction plate is parallel to the axial direction of the base frame; The first stator includes a first sleeve and a plurality of third electrode sheets, and the plurality of third electrode sheets are arranged on the inner wall of the first sleeve; The first rotor is arranged in the first sleeve, and the first rotor rotates relative to the first stator to drive the second friction plate to rub against each of the third electrode plates in turn to generate the the sensing signal. 7. The self-powered water flow detector according to claim 6, wherein the power generating unit includes a third rotor and a third stator, and the third rotor includes a second rotor base plate and a plurality of third friction plates , a plurality of the third friction plates are distributed along the circumferential direction of the second rotor base plate; The third stator includes a second stator base plate and a plurality of fourth electrode slices, the plurality of fourth electrode slices are evenly distributed along the circumferential direction of the second stator base plate, and two adjacent fourth electrode slices electrical connection between 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 detector according to claim 3, wherein the first rotor includes a rotating block and a plurality of fifth electrode pieces, and a plurality of fifth electrode pieces are arranged on the rotating block and arranged in p rows, and the position of each column of the fifth electrode sheet along the axial direction of the rotating block corresponds to; The first stator includes a fourth friction sheet and a plurality of sixth electrode sheets, the fourth friction sheet is cylindrical, and the plurality of sixth electrode sheets are arranged on the outer wall of the fourth friction sheet, and Along the axial direction of the fourth friction sheet, two adjacent sixth electrode sheets are arranged alternately, and the sixth electrode sheets are arranged in s rows, 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 detector according to claim 8, wherein the power generating unit includes a fourth rotor and a fourth stator, and the fourth rotor includes a third rotor base plate and a plurality of fifth friction plates , the fifth friction plate is distributed along the circumferential direction of the third rotor base plate; The fourth stator includes a third stator base plate and a plurality of seventh electrode slices, and the plurality of seventh electrode slices are distributed along the circumferential direction of the third stator base plate; 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 electrical signal. 10. The self-powered water flow detector of claim 3, wherein the first rotor includes a rotor bracket and a plurality of sixth friction plates, and the rotor bracket has a plurality of shafts along the rotor bracket The center of the second support plate is radially distributed, the sixth friction plate is arranged on the end of the second support plate away from the axis center of the rotor bracket and corresponds to the second support plate one by one, the sixth friction plate The friction plate is parallel to the axial direction of the rotor support; The first stator includes a second sleeve and a plurality of eighth electrode sheets, and the plurality of eighth electrode sheets are arranged on the inner wall of the second sleeve; The first rotor is arranged in the second sleeve, and the first rotor rotates relative to the second sleeve to drive the sixth friction plate to rub against the eighth electrode plate to generate the sensor Signal. 11. The self-powered water flow detector according to claim 10, wherein the power generating unit comprises a fifth stator and a second magnetic member, the fifth stator comprises a second body and a second coil, the 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 part is arranged between two adjacent sixth friction plates of the rotor bracket, and the position of the second magnetic part corresponds to the position of the second coil; The first rotor rotates relative to the fifth stator to drive the second magnetic member to move relative to the second coil to generate the electric signal. 12. The self-powered water flow detector according to claim 11, characterized in that, the power generation unit further comprises a sixth stator, and the sixth stator is arranged at a distance from the second rotor away from the fifth stator. side; The sixth stator includes a third body and a third coil, the third body is provided with a third accommodating slot, the third coil is located in the third accommodating slot, the third coil and the The position of the second coil corresponds to; The first rotor rotates relative to the sixth stator to drive the second magnetic member to move relative to the third coil to generate the electric signal. 13. The self-powered water flow detector according to claim 3, wherein the rotating shaft is connected to the impeller through a magnetic member. 14. The self-powered water flow detector according to any one of claims 1 to 13, wherein the communication unit includes a single-chip microcomputer and a display module, and the single-chip microcomputer is electrically connected to the display module; the battery management The unit includes a rectification circuit electrically connected to the power generation unit.

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