CN106017578B

CN106017578B - High-precision radio frequency card full-digital waterproof intelligent water meter

Info

Publication number: CN106017578B
Application number: CN201610529498.XA
Authority: CN
Inventors: 孙恩新; 孙振
Original assignee: Individual
Current assignee: Liaoning Xin Hong Yuan Science And Technology Co ltd
Priority date: 2016-07-06
Filing date: 2016-07-06
Publication date: 2020-04-14
Anticipated expiration: 2036-07-06
Also published as: CN106017578A

Abstract

The invention relates to a high-precision radio frequency card all-digital waterproof intelligent water meter, which comprises a water meter shell, wherein a water meter front cavity and a water meter rear cavity are arranged in the water meter shell, a sealed electronic bin is arranged above the water meter front cavity and the water meter rear cavity, a single chip microcomputer control system is arranged in the electronic bin, an anti-drip flow guide device and a metal detection sensing device are arranged in the water meter front cavity, an electric magnetic pilot valve is arranged in the water meter rear cavity, the metal detection sensing device is electrically connected with the single chip microcomputer control system, and the electric magnetic pilot valve is electrically connected with the single chip microcomputer; the invention adopts metal detection double-induction-point acquisition signals, and the electric magnetic pilot valve adopts the design of electric rotary pole changing, a frame type sliding shaft, a double-needle-shaped valve core, a rubber cup transverse switch valve and a lengthened pilot cavity water outlet pipe. The device has the advantages of simple structure, convenient assembly, small volume, light weight, high metering precision, small starting flow, low manufacturing cost, moisture and water resistance, low failure rate, strong anti-interference capability, small pressure loss and the like.

Description

High-precision radio frequency card full-digital waterproof intelligent water meter

Technical Field

The invention relates to the field of automatic control of fluid metering, in particular to a high-precision radio frequency card full-digital waterproof intelligent water meter.

Background

China is a world with shortage of fresh water resources, along with the rapid development of industry and agriculture, the living standard of residents is continuously improved, the water consumption is continuously increased, and the contradiction between supply and demand is increasingly prominent. In order to solve the problems of difficult meter reading and difficult charging, the popularization plan of the prepayment intelligent water meters is successively made in large and medium cities in China, and various types of IC card intelligent water meters are successively developed by domestic related scientific research institutions and large and medium water meter manufacturers. The water meter has improved performance after continuous improvement and perfection for more than ten years, but the water meter is assembled by adopting a traditional water meter as a base meter and additionally arranging a magnetic sensor, a singlechip electronic device, an electric ball valve, a display screen and the like, and still has the defects of low metering precision, large initial flow, untight valve closing, high failure rate, poor anti-interference performance, high power consumption, poor moisture-proof and waterproof performance, high manufacturing cost and the like. Because the water quality in some areas of China is poor, the scale formation in the meter is serious after long-term use, and the electric ball valve fails to work. The water meter usually works in a high-humidity environment, the existing intelligent water meter is difficult to be totally closed, and short circuit and power leakage faults are easy to occur due to batteries, circuit boards, electronic components and the like. The initial flow of the existing intelligent water meter is more than 8 liters/hour, so that a small number of users cannot measure water stealing by using small flow, and the loss is caused to water supply units.

Patent CN101000254.A discloses an internal guide type multifunctional digital water meter, which adopts dry type internal guide flow and single display of a liquid crystal digital screen, and is provided with an internal guide flow and gravity valve small-hole jet flow leakage prevention device, a buoyancy ventilation valve device, an electromagnetic guide valve device and an electric field effect sensor. The water meter changes the whole structure of the Fortman water meter and has the characteristics of simple structure, small volume, light weight, unlimited requirement on water quality, long service life, low failure rate and good stability. However, the electric field effect sensor has a complicated structure and is difficult to assemble. Magnetic rotation exists, and the anti-interference performance is poor. The working current is more than 8 microamperes, the high area of the metering precision is less than +/-2%, and the low area is less than +/-5%. The cost is high. Electromagnetic pilot valve: the structure is complicated, the volume is large, and the assembly is difficult. The pressure spring works for a long time, so that the metal fatigue deformation is easy to cause, the elasticity is reduced, and when the water pressure is high, the valve opening is easy to cause to be inflexible. The current is more than 500 milliamperes at the moment of coil work, and the singlechip easily causes the crash because of voltage drops suddenly by a wide margin. The magnetic material in the pilot cavity is easy to cause scaling in the cavity, and faults are caused. The working time of the valve is less than 1/10 seconds, and the water sag phenomenon is serious. The pilot chamber water inlet small hole, the water outlet small hole and the rubber cushion type valve core are of an upper structure and a lower structure, and are limited by space, and the distance between the magnetic element and the small hole is very small, so that iron ions in water are easy to accumulate and scale, the small hole is blocked, and faults are caused. The rubber cup and the water outlet of the water meter are of an upper structure and a lower structure, so that the water flow is increased in break angle, the pressure loss is increased, and the national pressure loss standard is hardly less than 0.063 MPa.

Disclosure of Invention

The invention aims to solve the technical problem of providing a high-precision radio frequency card full-digital waterproof intelligent water meter which has the advantages of simple structure, convenience in assembly, small volume, light weight, high metering precision, small starting flow, low manufacturing cost, moisture resistance, water resistance, low failure rate, strong anti-interference capability, small pressure loss and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

the high-precision radio frequency card all-digital waterproof intelligent water meter comprises a water meter shell, wherein a water meter front cavity and a water meter rear cavity are arranged in the water meter shell, a sealed electronic bin is arranged above the water meter front cavity and the water meter rear cavity, a single chip microcomputer control system is arranged in the electronic bin, an anti-drip flow guide device and a metal detection sensing device are arranged in the water meter front cavity, an electric magnetic pilot valve is arranged in the water meter rear cavity, the metal detection sensing device is electrically connected with the single chip microcomputer control system, and the electric magnetic pilot valve is electrically connected with the single chip microcomputer control system;

the antidrip flow guide device comprises an impeller shell fixed in a front cavity of the water meter, wherein the upper part of the impeller shell is a flow guide cavity, the lower part of the impeller shell is a water inlet cavity, the lower part of the water inlet cavity is provided with a filter screen, a large water flow water inlet and a small water flow water inlet are arranged above the filter screen, the large water flow water inlet is communicated with the flow guide cavity through a large flow guide inclined hole, the small water flow water inlet is communicated with the flow guide cavity through a small flow guide inclined hole, a stainless steel stamping antidrip valve core is arranged above the large water flow water inlet, the flow guide cavity is provided with a skirt-type impeller, and the flow guide cavity is provided;

the metal detection sensing device comprises a metal detection sensor probe arranged at the top of the diversion cavity and a stainless steel sheet embedded at the upper part of the skirt-type impeller;

the electric magnetic pilot valve comprises a valve body fixed in a rear cavity of the water meter, a speed reducing motor is arranged on the upper portion of the valve body, a transverse magnetic ring is fixed on an output shaft of the speed reducing motor, a frame type sliding shaft is sleeved in a pilot cavity outside the transverse magnetic ring, a front magnet and a front needle-shaped valve core are arranged on the front side of the sliding shaft, a rear magnet and a rear needle-shaped valve core with the magnetic poles opposite to those of the front magnet are arranged on the rear side of the sliding shaft, a pilot cavity water inlet hole is arranged corresponding to the front valve core, a pilot cavity water outlet hole is arranged corresponding to the rear needle-shaped valve core, a pilot cavity water outlet pipe which is bent and folded correspondingly to the pilot cavity water outlet hole is arranged on the rear side of the valve.

The stainless steel stamping piece for the anti-drip valve core is provided.

And hard alloy beads are embedded at the top of the central shaft of the skirt type impeller.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention adopts the design of inner diversion, drip-proof, double small diversion inclined holes and skirt type impellers. And (3) designing a metal detection double-induction-point acquisition signal. The electric magnetic pilot valve adopts the design of electric rotary pole changing, a frame type sliding shaft, a double-needle-shaped valve core, a rubber cup transverse switch valve and a lengthened pilot cavity water outlet pipe. And the electronic cabin is designed to be fully sealed and waterproof. The multifunctional large display screen is designed by combining a flash diode and a function key. And metering error table external section infinite correction technology. The meter has the advantages of simple structure, convenient assembly, small volume, light weight, high metering precision, small starting flow, low manufacturing cost, moisture and water resistance, low failure rate, strong anti-interference capability, small pressure loss and the like.

2. The anti-leakage valve core is a stainless steel stamping part, the sealing surface is flat, the small-flow closed water inlet is tight, and the cost is low.

3. The metal detection sensor has simple structure and easy assembly. And the double sensing points are designed, so that the resolution is high. No magnetic element, and strong anti-interference capability. The working current is less than 5 microamperes, and the metering error can be less than +/-0.5% in both high and low regions by adopting a segmented infinite correction technology.

4. Electric magnetic valve: simple structure, small volume and easy assembly. The working current is less than 30 milliamperes, and the working current is very small, so that the influence on the single chip microcomputer is avoided. The frame type sliding shaft can generate larger force, and the working pressure of the valve can be more than 1.2 MPa. The design of the lengthened guide cavity water outlet pipe can greatly reduce impurities in water from entering the guide cavity, reduce the failure rate and reduce the water sag phenomenon.

5. The water inlet small hole and the water outlet small hole of the valve body of the electric magnetic valve and the needle-shaped valve core are of a transverse structure, so that the magnet is far away from the water inlet small hole and the water outlet small hole, and even if a small amount of iron ions adsorb the magnet, the blockage of the small holes can not be caused. The rubber cup and the water outlet of the water meter are also designed transversely, water flows smoothly out of the meter, pressure loss is reduced, and the pressure loss of the whole meter can be less than 0.06 MPa. The design can also reduce the manufacturing difficulty of the water meter shell and has low cost.

Drawings

FIG. 1: the water meter overall structure and the process flow section view.

FIG. 2: a water meter front cavity structure and a process flow chart.

FIG. 3: water gauge water conservancy diversion chamber structure and process flow top view.

FIG. 4: a small-hole jet flow anti-drip structure and a process flow chart.

FIG. 5: a flow guide cavity small-hole jet flow leakage-proof structure and a process flow plan view are provided.

FIG. 6: a water meter rear cavity valve opening state structure and a process flow chart.

FIG. 7: valve open state pilot cavity structure and process flow top view.

FIG. 8: a water meter rear cavity valve closing state structure and a process flow chart.

FIG. 9: the water meter closes valve state guide cavity structure and the process flow top view.

FIG. 10: water gauge outward appearance side view.

FIG. 11: water gauge outward appearance top view.

In the figure: the water meter comprises a water meter shell 1, a water meter water inlet 2, a water meter front cavity 3, a water meter rear cavity 4, a water meter water outlet 5, a filter screen 6, a large water flow water inlet 7, a leakage-proof valve core 8, a large flow guide inclined hole 9, a small water flow water inlet 10, a small flow guide inclined hole 11, a flow guide cavity 12, a skirt-type impeller 13, a stainless steel sheet 14, a metal detection sensor probe 15, a flow guide cavity water outlet 16, a speed reducing motor 17, a motor output shaft 18, a transverse pole magnetic ring 19, a guide cavity 20, a sliding shaft 21, a front magnet 22, a front needle-shaped valve core 23, a rear magnet 24, a rear needle-shaped valve core 25, a guide cavity water inlet 26, a guide cavity water outlet 27, a guide cavity water outlet pipe 28, a rubber cup 29, an electronic cabin 30, an electronic cabin shell 31, a waterproof lower sealing cover 32, a protective cover 33, a transparent window 34, a battery 35, a singlechip mainboard 36, a water inlet chamber 41 and a valve body 42.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings:

referring to fig. 1, the high-precision radio frequency card all-digital waterproof intelligent water meter comprises a water meter shell 1, wherein a water meter front cavity 3, a water meter rear cavity 4 and a water meter front cavity 3 are arranged in the water meter shell 1 and are communicated with a water meter water inlet 2, the water meter rear cavity 4 is communicated with a water meter water outlet 5, an anti-leakage guide device and a metal detection sensing device are arranged in the water meter front cavity 3, and an electric magnetic pilot valve is arranged in the water meter rear cavity 4;

a sealed electronic bin 30 is arranged above the front cavity 3 and the rear cavity 4 of the water meter, the electronic bin 30 is a closed bin body consisting of an electronic bin shell 31 and a waterproof lower sealing cover 32, a single-chip microcomputer control system is arranged in the electronic bin 30, the single-chip microcomputer control system comprises a single-chip microcomputer mainboard 36, the single-chip microcomputer mainboard 36 is connected with a battery 35, a liquid crystal display 37, a flash diode 39 and a waterproof function key 38, and a transparent window 34 is arranged on the electronic bin shell 31; the upper part of the electronic bin shell 31 is provided with a protective cover 33.

The metal detection sensing device is electrically connected with the single chip microcomputer control system, and the electric magnetic pilot valve is electrically connected with the single chip microcomputer control system. The anti-leakage flow guide device comprises an impeller shell 40 fixed in a front cavity 3 of the water meter, wherein the upper part of the impeller shell 40 is a flow guide cavity 12, the lower part of the impeller shell is a water inlet cavity 41, the water inlet cavity 41 is provided with a filter screen 6, a large water flow water inlet 7 and two small water flow water inlet holes 10 are arranged above the filter screen 6, the large water flow water inlet 7 is communicated with the flow guide cavity 12 through 6 large flow guide inclined holes 9, the small water flow water inlet holes 10 are communicated with the flow guide cavity 12 through small flow guide inclined holes 11, a stainless steel stamping anti-leakage valve core 8 is arranged above the large water flow water inlet 7, a skirt impeller 13 is arranged in the flow guide cavity 12, the top of the central shaft of the skirt impeller is inlaid with a hard alloy bead, and the flow guide cavity 12 is provided;

the metal detection sensing device comprises a metal detection sensor probe 15 arranged at the top of the diversion cavity 12 and a stainless steel sheet 14 embedded at the upper part of the skirt-type impeller 13;

the electric magnetic pilot valve comprises a valve body 42 fixed in a rear cavity of the water meter, a speed reducing motor 17 is arranged at the upper part of the valve body 42, a transverse magnetic ring 19 is fixed on an output shaft 18 of the speed reducing motor, a pilot cavity 20 outside the transverse magnetic ring 19 is sleeved with a frame type sliding shaft 21, a front magnet 22 and a front needle-shaped valve core 23 are arranged on the front side of the sliding shaft 21, a rear magnet 24 and a rear needle-shaped valve core 25 with opposite magnetic poles to the front magnet 22 are arranged on the rear side, a pilot cavity water inlet hole 26 is arranged corresponding to the front valve core 23, a pilot cavity water outlet hole 27 is arranged corresponding to the rear needle-shaped valve core 25, a pilot cavity water outlet pipe 28 bent and folded back correspondingly to the pilot cavity water outlet hole 27 is arranged on the rear side of the valve body 42 corresponding to the water outlet 5 of the water meter.

The working principle and the flow of the water meter are as follows:

as shown in fig. 2-3, water flows enter through the water inlet 2 of the water meter, the front cavity 3 of the water meter, the filter screen 6 and the large water inlet 7, the drip-proof valve core 8 is pushed to move upwards, and the water flows enter the diversion cavity 12 through the 6 large diversion inclined holes 9, so that a rotating vortex can be generated in the diversion cavity 12 to drive the skirt-type impeller 13 to rotate. Two stainless steel sheets 14 are embedded at the upper part of the skirt type impeller 13, and when the impeller rotates for a circle, the stainless steel sheets 14 and the metal detection sensor probe 15 can generate two pulse signals. Therefore, the single chip microcomputer can calculate the revolution of the impeller 13 and the water consumption and water consumption, the top of the central shaft of the skirt-type impeller is embedded with the hard alloy beads, the wear is not easy to occur after long-term use, and various indexes cannot be reduced.

As shown in fig. 4-5, the small-flow and micro-flow water flow can not push the anti-drip valve core 8 sealed at the upper part of the water inlet 7 of the diversion cavity, but can only flow into the diversion cavity 12 through the two small-flow water inlet holes 10 and the small diversion inclined hole 11, and the generated jet flow pushes the impeller 13 to rotate, so that the initial flow can be greatly reduced.

As shown in fig. 6-7, after recharging, the single chip commands the battery 35 to supply power to the speed reducing motor 17, and the motor output shaft 18 drives the transverse magnetic ring 19 to rotate 180 degrees, so as to reach the stuck point. The motor output shaft 18 stops rotating and the current suddenly increases, and the single chip commands the battery 35 to power off. The magnetic pole of the transverse magnetic ring 19 is changed, and the sliding shaft 21 moves forward by generating thrust with the front magnet 22 and attraction with the rear magnet 24. The front needle-shaped valve core 23 seals the water inlet pipe 26 of the pilot cavity, and simultaneously the rear needle-shaped valve core 25 opens the water outlet hole 27 of the pilot cavity, because the water pressure of the rear cavity 4 of the water meter is higher than the water pressure of the pilot cavity 20, the pilot valve leather cup 29 moves forwards, the water in the pilot cavity 20 is discharged from the water outlet 5 of the water meter through the water outlet hole 27 of the pilot cavity and the water outlet pipe 28, and the valve is opened.

The power transmission of the design is non-contact: the speed reducing motor 17, the motor output shaft 18 and the transverse magnetic ring 19 are absolutely isolated from the pilot cavity 20 and are not contacted with water, so that the failure rate can be reduced.

The front magnet 22 and the rear magnet 24 fixed on the frame type sliding shaft 21 have opposite magnetic poles, and can generate attraction and thrust simultaneously with the transverse magnetic ring 19, thereby being capable of multiplying the force acting on the frame type sliding shaft 21. And when the frame-type sliding shaft 21 moves forward, the front magnet 22 moves away from the transverse pole magnetic ring 19, and the thrust force decreases. However, the attraction force is increased because the rear magnet 24 is close to the transverse magnetic ring 19, so that the force generated during the left and right movement of the frame slide shaft 21 is always the same.

When the pilot valve is opened, the user closes the valve to stop water supply, and the rubber cup 29 is elastically reset to the valve closing state because there is no pressure difference between the diversion cavity 20 and the water outlet 5 of the water meter, and the water at the water outlet 5 of the water meter flows back to the diversion cavity 20 through the water outlet pipe 28 of the diversion cavity. When the valve is opened by a user, the rubber cup 29 returns to the open state, and the water in the pilot cavity 20 is discharged from the pilot cavity water outlet pipe 28. The water meter repeatedly uses and stops water in long-term use, and the rubber cup 29 repeatedly moves back and forth. The water at the water outlet 5 of the water meter repeatedly enters and exits the pilot cavity 20 through the pilot cavity water outlet pipe 28. If the quality of water is poor, impurities in water are easy to precipitate and scale in the pilot cavity 20, so that the water inlet hole 26 of the pilot cavity and the water outlet hole 27 of the pilot cavity are blocked, and faults are caused. The water outlet pipe 28 of the pilot cavity is designed to be lengthened, the volume of the water in the water outlet pipe 28 of the pilot cavity is 1.5-2 times of the volume of the inner cavity of the rubber cup, so that the volume of water in the pipe is larger than the amount of water which enters and exits the pilot cavity 20 through extrusion of the rubber cup, the water in the pilot cavity 20 can only circulate between the pilot cavity 20 and the water outlet pipe 28 of the pilot cavity, impurities outside the pilot cavity 20 are reduced from entering the pilot cavity 20, and the failure rate is reduced. The lengthened bent and folded guide cavity water outlet pipe 28 can also prolong the working time of the rubber cup 29 when the valve is opened and closed, and the water sag phenomenon is reduced.

The rubber cup 29 is transversely designed, so that the manufacturing difficulty of the water meter shell 1 can be reduced, the water flow flowing through the water outlet 5 of the water meter is smooth, and the pressure loss is reduced.

As shown in fig. 8-9, when the user uses up the amount in the water meter, the single chip computer directs the battery 35 to supply power to the speed reducing motor 17 in the reverse direction. The sliding shaft 21 moves backwards and the pilot valve inlet hole 26 is opened, while the pilot valve outlet hole 27 is closed. Water in the rear cavity 4 of the water meter enters the pilot cavity 20 through the water inlet hole 26, the water pressure of the pilot cavity 20 is larger than that of the water outlet 5 of the water meter, the leather cup 29 moves backwards, and the valve is closed. When the remaining amount is 5m³When the amount is equivalent, the valve is closed. The display screen 37 displays quick recharging, and after one minute, the valve is opened to supply water, so that the remaining amount of the user is prompted.

As shown in fig. 11, the upper protective cover 33 is lifted. And pressing the function key 38, the display screen 37 enters a display state from a dormant state, the display screen 37 appears a water purchase amount interface, and the recharging card which finishes the water purchase amount is shaken slightly above the recharging area. The flash diode 39 flashes and the display 37 displays the water purchase amount, and the recharging is successful. If the rechargeable card is not recharged or the non-special rechargeable card shakes above the recharging receiving area, the flash diode 39 does not flash, and the display screen 37 displays misoperation.

In practice, the coefficients of the impeller 13 and the flow rate of each flow rate section, such as the initial flow rate, the small flow rate, the common flow rate, the large flow rate, the maximum flow rate, and the like, are obviously different. Because the meter directly collects signals from the impeller 13, the single chip microcomputer can respectively correct the coefficients of all the flow sections, and an error curve can be corrected into a straight line. And the individual errors can be respectively corrected outside the meter by using the correction card, so that the metering precision of the water meter can be greatly improved. In use, due to poor water quality in individual areas of China, the metering precision is easy to reduce caused by scale formation in a meter, mechanical abrasion and the like after long-time use, and field error correction outside the meter can be realized.

The correction method comprises the following steps: firstly, two correction cards of + 0.5% and-0.5% are designed and manufactured, and the display screen 37 is adjusted to a correction interface through the function key 38. If the measured flow of the water meter is less than the actual flow, the + 0.5% correction card is used to shake above the induction receiving area, so that the measured flow can be increased by 0.5%, and then the measured flow can be increased by 0.5% until the measured flow is consistent with the actual flow. If the measured flow is larger than the actual flow, a correction card of-0.5% can be used for correction by the same method. It can also be made into several groups of correction cards of + 0.5% and-0.5% of each flow section of high zone and low zone respectively, and can be used for correcting different metering errors of each flow section respectively, so that said meter can possess very high metering accuracy.

The foregoing is considered as illustrative only of the principles of the invention and is not to be in any way limiting, since all equivalent changes and modifications are intended to be included within the scope of the appended claims.

Claims

1. The high-precision radio frequency card all-digital waterproof intelligent water meter comprises a water meter shell, wherein a water meter front cavity and a water meter rear cavity are arranged in the water meter shell, a sealed electronic bin is arranged above the water meter front cavity and the water meter rear cavity, and a single chip microcomputer control system is arranged in the electronic bin; the antidrip flow guide device comprises an impeller shell fixed in a front cavity of the water meter, wherein the upper part of the impeller shell is a flow guide cavity, the lower part of the impeller shell is a water inlet cavity, the lower part of the water inlet cavity is provided with a filter screen, a large water flow water inlet and a small water flow water inlet are arranged above the filter screen, the large water flow water inlet is communicated with the flow guide cavity through a large flow guide inclined hole, the small water flow water inlet is communicated with the flow guide cavity through a small flow guide inclined hole, a stainless steel stamping antidrip valve core is arranged above the large water flow water inlet, the flow guide cavity is provided with a skirt-type impeller, and the flow guide cavity is provided; the electric magnetic pilot valve comprises a valve body fixed in a rear cavity of the water meter, a speed reducing motor is arranged on the upper portion of the valve body, a transverse magnetic ring is fixed on an output shaft of the speed reducing motor, a frame type sliding shaft is sleeved in a pilot cavity outside the transverse magnetic ring, a front magnet and a front needle-shaped valve core are arranged on the front side of the sliding shaft, a rear magnet and a rear needle-shaped valve core with the magnetic poles opposite to those of the front magnet are arranged on the rear side of the sliding shaft, a pilot cavity water inlet hole is arranged corresponding to the front valve core, a pilot cavity water outlet hole is arranged corresponding to the rear needle-shaped valve core, a pilot cavity water outlet pipe which is bent and folded correspondingly to the pilot cavity water outlet hole is arranged on the rear side of the valve.

2. The intelligent water meter with high precision and full digital and waterproof function as claimed in claim 1, wherein the metal detection sensing device comprises a metal detection sensor probe disposed on the top of the diversion cavity, and a stainless steel sheet embedded on the upper part of the skirt impeller.

3. The all-digital waterproof intelligent water meter with the high-precision radio frequency card according to claim 1, wherein the anti-drip valve core is a stainless steel stamping.

4. The all-digital waterproof intelligent water meter with a high-precision radio frequency card according to claim 1, wherein a hard alloy bead is embedded on the top of the central shaft of the skirt impeller.