[Chinese instrument network meter patent] creative limit, instrumentation invention. Today, we introduced a national invention-authorized patent - a wireless intelligent remote water meter based on NB-IOT. The patent was applied for by Fuzhou Jinze Technology Co., Ltd. and was authorized to be announced on January 12, 2018.
Content Description
The invention relates to the technical field of water meters, in particular to a wireless intelligent remote water meter based on NB-IOT.
Background of the invention
The vast majority of commercial water meters on the market today require manual meter reading, which takes time and effort. There are also small wireless water meters under unlicensed frequency bands that are susceptible to external signal interference, low meter reading efficiency, and high error rates. Single function, unable to advance with the times, can not meet the needs of intelligent social progress. Therefore, in the existing water meter structure basically, such as the water meter structure disclosed in Patent No. 201610214331 .4, the sensor is used to collect the flow information of the water flow, and the wireless meter reading function is added.
In addition, at present, the most commonly used water meter iron case cast through the sand casting, although spray treatment can reduce the time of rust, but rust is inevitable, and calcium oxide in drinking water is likely to cause damage to the human liver. The copper case is the most widely used water meter in the world, but the copper contained in the copper case will also cause secondary pollution to the water quality. Although the plastic case has no harm to the human body, it cannot withstand the harsh environment of the sun, rain, high temperature, cool weather and cold weather, and the quality is not very stable. The aluminum alloy case was developed and tested in recent years, but the coating is difficult to be permanently protected. The aluminum alloy contains harmful elements to the human body and also has an adverse effect on the body of the drinker.
Summary of the Invention
To solve the above problem, the object of the present invention is to provide an NB-IOT-based wireless intelligent remote water meter, which sets the NB-IOT wireless transmission module so that the water meter operates in the licensed frequency band and realizes wireless meter reading.
The figure is a schematic diagram of the circuit principle of the present invention
The technical solution adopted by the present invention is: a wireless intelligent remote water meter based on NB-IOT, including a water meter body. An upper cavity and a lower cavity are arranged in the body of the water meter body, and the body of the water meter is also provided with a lower cavity. An externally connected water inlet and a water outlet connecting the upper chamber with the outside, an impeller base is disposed in the lower chamber, and an impeller top seat connected with the impeller base is disposed in the upper chamber, and the impeller base and the impeller top seat are rotatably connected; The impeller shaft is provided with an impeller at the lower end of the impeller shaft, and the upper end of the impeller shaft is coaxially provided with magnetic steel. The water meter body also includes a control circuit disposed in the upper cavity. The control circuit includes an MCU main control module to collect voltage signals or pulses. Signal sensor module, display module for displaying water flow information, NB-IOT wireless transmission module for wireless transmission of water flow information, and alarm module for abnormal alarm; input of MCU main control module and sensor module The output is connected to convert the signal collected by the sensor module into water flow information, and the output of the MCU main control module is connected to the input of the display module. In order to display the converted water flow information on the display module, the output of the MCU main control module is also connected to the input of the NB-IOT wireless transmission module to send the water flow information to the cloud server via the wireless network. The module is also connected with the alarm module to receive the alarm trigger signal and send the alarm information; the sensor module includes more than one stepper motor sensor and more than one Hall sensor; each stepper motor sensor includes a fixed upper surface of the top seat of the impeller and A magnetically conductive stator sheet radially arranged on the side of the magnet steel, a wire rack core connected between both ends of the high magnetically conductive stator sheet, and a coil wound on the wire rack core to induce a voltage signal; Into the motor sensor, the coil is connected to the input end of the MCU main control module; each Hall sensor is installed on the side of the radial direction of the magnet to collect the pulse signal generated by the magnetic steel and simultaneously determine the positive and negative rotation of the impeller. The flow of water is measured in positive and negative flow; the output of the NB-IOT wireless transmission module is also connected with an NB-IOT antenna, and the NB-IOT wireless transmission module is passed through the NB-IOT antenna and NB-IO in sequence. The T cell base station is connected to the cloud server.
The wireless intelligent remote water meter also includes a water meter housing connected to the upper end of the water meter body. The wireless smart remote water meter also includes a power supply module. The power supply module includes a metering battery unit connected to the control circuit for supplying power to the MCU control circuit, and the NB-IOT antenna. The connected communication battery is used to supply the NB-IOT wireless transmission module and the NBIOT antenna separately; the metering battery pack is located in the water meter housing. Because the power module is installed in the battery case outside the meter body, it is easy to replace.
The wireless intelligent remote water meter also includes an electric ball valve for restricting the flow of the water outlet. The electric ball valve includes a valve core that can be opened and closed at the water outlet, and is connected to the side of the valve core to drive the valve core to rotate. The valve stem and the gear reduction motor connected to the valve stem; the input end of the gear reduction motor is connected with the MCU main control module; the output end of the gear reduction motor is connected with the input end of the valve stem; the gear reduction motor drives the valve core through the valve stem The rotation occurs and the centerline of rotation of the valve core intersects with the centerline of the outlet port perpendicularly. The MCU control module can receive signals from the cloud server through the NB-IOT wireless transmission module to control the operation of the gear reduction motor, thereby controlling the rotation of the electric ball valve to close or open the outlet. The number of stepper motor sensors is one, and the number of Hall sensors is one or more.
In actual use, the water flowing in the pipeline passes through the inlet of the wireless intelligent remote water meter and enters the lower chamber through the rectifier. The flow of water drives the rotation of the impeller and drives the magnetic steel set on the upper end of the impeller to concentrically rotate, and the magnetic steel passes through. The rotation causes a radial N/S pole magnetic field change, two kinds of different sensors (one stepping motor sensor, one or more Hall sensors) mounted on the radial side of the magnet are synchronized to obtain the rotation state of the impeller; In the stepper motor sensor, the magnetic force generated on the magnetic steel is transmitted through the high-magnetic stator stator, and the magnetic is transferred to the wire frame iron core. The magnetic field lines change due to the rotation of the magnetic steel to generate a cutting magnetic force line, and a voltage signal is induced on the coil and is input to the MCU via the wire. The main control module; At the same time, the Hall sensor collects the electric pulse signal generated on the magnetic steel, and is synchronously input to the MCU main control module via the wire. In order to improve the accuracy, two kinds of sensors collect the signals according to different rotation speeds of the impellers respectively. The two sensors can automatically switch work. When the impeller rotates at high speed, that is, when the rotation speed is ≥5r/s, the stepper motor sensor collects the signals when the impeller When the speed is low, ie when the speed is <5 r/s, the Hall sensor performs signal acquisition. The MCU main control module judges and calculates the direction of the synchronization pulse signal, obtains the flow information of the water flow, and outputs it to the liquid crystal display for display and sends it to the cloud server through the NB-IOT wireless transmission module, and the NB-IOT wireless transmission module can work in the authorization. Frequency bands, solid-wire wireless meter reading, provide the basis for the follow-up of water supply companies. The operating company platform can extract the water meter reading data received from the cloud server and can connect to the charging system for tariff settlement. At the same time, it can perform big data analysis and operation. According to data analysis and various alarm notifications, the operating company's department issues corresponding processing notices.
The alarm module includes a delisting alarm input module and an alarm output module for sending alarm information; the delisting alarm input module includes a pressure-touch switch provided on the surface of the water meter body for detecting whether the case is pressed and opened; if the pressure switch is obtained The alarm trigger signal is sent to the MCU control module. The MCU control module sends the alarm trigger signal to the cloud server through the NB-IOT wireless transmission module. The operating company can take corresponding measures according to the signal. The display module consists of a 9-digit 8-segment LCD display, which is also capable of 14-digit display. MCU main control module includes MSP430/STM32L one-chip computer. The NB-IOT wireless transmission module includes an NB-IOT communication module. The MCU control module is also connected with a SIM number card, and each water meter can be uniquely coded through the SIM number card. A rectifier is provided in the water inlet to prevent turbulence in the water flow. A filter screen for filtering the water flowing into the impeller base is also provided below the impeller base, and this filter screen can filter out impurities in the water. The coil is provided with a lead-out joint 1, a lead-out joint 2 and a lead-out joint 3. The lead-out joint 1 and the lead-out joint 3 are respectively connected with two ends of a capacitor. The capacitor is connected with the metering battery pack and charges the metering battery pack to increase the metering battery. The power supply time of the group extends the service life of the water meter. The signal source amplification module and the filter module of the second connector are connected to the input of the MCU main control module. The MCU main control module collects the voltage signals on the coil.
The case of the water meter body is made of 304 food grade stainless steel, and the watch core structure in the upper cavity and the lower cavity is made of food grade material. Among them, 304 food-grade stainless steel materials will become the most scientific alternative materials for water meter cases due to their unique advantages that cannot be replaced by other materials such as health, environmental protection, and long service life. The wireless intelligent remote water meter can be made using the following two schemes: Solution one: First modeling on the three-dimensional software, after the optimization of the fluid mechanics software simulation calculation, and out of the parts diagram, converted into sheet metal mode, unfolded as a floor plan , Then use precision laser cutting machine to cut out the required stainless steel plate, after the mold roll forming, and then laser welding into the various parts of the structure, after trimming after the incision, using fixture positioning, and then by five-axis laser welding forming blank; Then, the teeth of each part of the machine are machined and machined, and the surface is then sandblasted to form a pickling electrolytic passivation treatment. Option 2: The case is divided into two left-hand pieces, 3D modeling is used to make a punching and shaping mold, and the left and right pieces are stamped and formed with a 1.8-2.5mm stainless steel plate, and then laser-welded into a case blank; Machining car out of various parts of the thread, the surface after sandblasting into the acid pickling electrolytic passivation treatment. It can be seen that a compact, highly consistent, and elegantly-looking wireless smart remote water meter can be obtained through precision laser cutting and five-axis laser manipulator precision welding.
Compared with the prior art, the present invention has the following beneficial effects: 1. The wireless intelligent remote water meter based on NB-IOT in the present invention employs an NB-IOT wireless transmission module. During signal transmission, the water meter can work in a licensed frequency band. , The data will be transmitted to the cloud server, a solid line wireless meter reading, to provide the basis for follow-up tariff settlement and big data statistics. 2. In order to improve the accuracy, the present invention uses a stepper motor sensor and four Hall sensors to collect signals for different rotation speeds of the impellers respectively, and the multi-path sensors can switch automatically. When the impeller rotates at a high speed, the rotation speed is ≥ 5r. /s, stepper motor sensor for signal acquisition, when the impeller rotates at low speed, that is, when the speed is <5r/s, the Hall sensor performs signal acquisition. 3. In the present invention, an electric ball valve for limiting the current is arranged at the water outlet, and the MCU main control module can receive the signal from the cloud server through the NB-IOT wireless transmission module to control the work of the gear reduction motor of the electric ball valve, thereby controlling the electric ball valve. Turn to close or open the outlet. 4. In the present invention, the case of the water meter body is made of 304 food-grade stainless steel, which is not easy to oxidize and rust. The watch core structure in the upper cavity and the lower cavity is made of food grade materials to avoid the infiltration of harmful substances in the water meter. Water has an impact on human health. Because 304 food-grade stainless steel materials have unique advantages that are not replaceable by other materials such as health, environmental protection, and long service life, they will become the most scientific alternative materials for water meter cases. 5. The present invention provides a pressure contact switch for detecting whether the case is pressed and opened by being installed on the surface of the body of the water meter. If the pressure contact switch receives an alarm trigger signal and sends it to the MCU control module, the MCU control module passes the NB-IOT. The wireless transmission module sends the alarm trigger signal to the cloud server, and the operating company can take corresponding measures according to the signal. 6. The coil in the present invention can provide electrical energy for the capacitor. The capacitor is connected to the metering battery pack and is charged to it, so that the power supply time of the metering battery pack can be increased and the service life of the meter can be extended. 7. The wireless wireless intelligent remote water meter based on NB-IOT in the present invention has the advantages of simple and reliable structure, high strength, light weight, high precision, long service life, and low cost.
For more information, please download the full specification of the patent.
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