Multi-channel large-caliber intelligent ultrasonic water meter device

Abstract

The utility model relates to a multi-channel large-caliber intelligent ultrasonic water meter device, which comprises an MCU (Microprogrammed Control Unit) control module for managing each module; the TDC metering module is used for collecting water flow information and sending the water flow information to the MCU control module; the channel selection module is used for switching the working states of the plurality of groups of transducers through an analog switch; the multiple groups of transducers are combined with the channel selection module to realize multi-channel flow measurement; the power supply module is used for supplying power to each module of the device; and the display module is connected with the MCU control module and is used for displaying the flow information and the equipment operation state. A high-precision TDC metering module is adopted, an adjustable voltage doubling circuit is arranged, and the boosting multiple can be adjusted according to the size of a pipe network; meanwhile, an external filter circuit for echo signals is arranged, so that the anti-interference capability of the metering module is improved; a plurality of groups of transducers are controlled through an analog switch, so that the problem of inconsistency of flow fields in a pipe section is solved, and the metering precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ultrasonic water meter technical field, concretely relates to a multi-channel large diameter intelligent ultrasonic water meter device. BACKGROUND

[0002] In the scenes of water resource's commercial settlement, trade measurement, secondary water supply measurement and the like, the large diameter water meter plays a vital role. For most water companies, the measured water volume of the large diameter water meter accounts for more than 70% of the total measured water volume, therefore, the water department puts forward higher and higher requirements on the measurement accuracy, stability and reliability of the large diameter water meter. However, the non-uniformity of the internal flow field of the large diameter water pipe section may cause significant measurement deviation of the single channel measurement mode; in addition, the existing large diameter ultrasonic water meter signal is easily disturbed by the external environment, affecting the accuracy of measurement. SUMMARY

[0003] To solve the above problems, the utility model provides a multi-channel large diameter intelligent ultrasonic water meter device, comprising:

[0004] The MCU control module is used for managing each module;

[0005] The TDC measurement module collects the water flow information and sends it to the MCU control module;

[0006] The channel selection module switches the working state of multiple groups of transducers through an analog switch;

[0007] The multiple groups of transducers realize multi-channel flow measurement in combination with the channel selection module;

[0008] The power supply module provides power supply for each module of the device;

[0009] The display module is connected with the MCU control module and is used for displaying the flow information and the equipment running state.

[0010] On the basis of the above scheme, the TDC measurement module comprises: a TDC measurement chip, the excitation and reception pins of the TDC measurement chip are respectively connected to the NO pin of the channel selection module through resistors; an adjustable voltage doubling circuit, comprising a voltage doubling capacitor, the voltage doubling capacitor is used for adjusting the voltage step-up multiple; a high-frequency crystal oscillator and a low-frequency crystal oscillator, the low-frequency crystal oscillator is used for calibrating the clock of the high-frequency crystal oscillator.

[0011] On the basis of the above scheme, the channel selection module contains two four-channel analog switch chips and filter capacitors of their power supply ends, two NO pins of the first analog switch chip are respectively connected with upstream signal transceiving ends of the TDC metering module, other two NO pins are respectively connected with downstream signal transceiving ends of the TDC metering module, COM pins are respectively connected with upstream and downstream of the transducers of group A and group B, NC pins are grounded, and IN pins are connected with control ports of the MCU control module.

[0012] On the basis of the above scheme, the high-frequency crystal oscillator and the first matching resistor form a high-frequency crystal oscillator circuit, the low-frequency crystal oscillator and the matching capacitor and the second matching resistor form a low-frequency crystal oscillator circuit, the external filter circuit includes an external filter circuit of echo signals and an external filter circuit of an analog power supply of the metering chip, and the external filter circuit of the echo signals includes a resistance-capacitance element and a voltage stabilizing capacitor.

[0013] On the basis of the above scheme, the external filter circuit of the echo signals is formed by a fourth resistor, a fifth resistor, a first capacitor and a second capacitor, the reference voltage of the echo signals is stabilized by a third capacitor and a fourth capacitor, and the external filter circuit of the analog power supply of the metering chip is formed by a fifth capacitor, a sixth capacitor, a seventh capacitor and a sixth resistor.

[0014] On the basis of the above scheme, the device further comprises a pulse detector module, the pulse detector module comprises an optical coupling isolation module, a diode and a resistor, the anode of the emitter of the optical coupling isolation module is connected to the control pin of the MCU through a seventh resistor, the cathode of the emitter is grounded, the C pole of the receiving end is connected to the positive pole of the external power supply through an eighth resistor, the E pole of the receiving end is used for detecting the level state, and the diode is arranged between the C pole and the E pole of the receiving end.

[0015] On the basis of the above scheme, the device further comprises a remote transmission module, adopts an NB-IOT wireless communication technology, and is used for data transmission between the water meter and the upper computer.

[0016] Compared with the prior art, the device adopts the high-precision TDC metering module, is provided with an adjustable voltage doubling circuit, can adjust the voltage doubling multiple according to the size of the pipe network, is simultaneously provided with the external filter circuit of the echo signals, and the anti-interference capability of the metering module is increased; a plurality of transducers are controlled through the analog switch, the inconsistency of the flow field in the pipe section is solved, and the precision of metering is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a TDC metering module circuit schematic diagram of the utility model;

[0019] Figure 3This is a schematic diagram of the channel selection module circuit of this utility model;

[0020] Figure 4 This is a schematic diagram of the pulse detection module circuit of this utility model; Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] like Figure 1 As shown, this application provides a multi-channel, large-diameter intelligent ultrasonic water meter device, including an MCU control module 1, a TDC (Time-to-Digital Converter) metering module 2, a channel selection module 3, multiple transducers 4, a power supply module 5, and a display module 6. The MCU control module, as the control center of the entire system, is responsible for managing the working status of each module, including but not limited to data acquisition and processing by the TDC metering module and information display by the display module.

[0024] The TDC metering module uses a high-precision TDC metering chip, such as Figure 2 As shown, its excitation and transceiver pins are connected to the NO pin of the channel selection module via resistors for receiving and transmitting ultrasonic signals. According to an embodiment of this application, one end of the first resistor R4 and the second resistor R8 are connected to the excitation and transceiver pins of the metering chip, and the other end is connected to the NO pin of the channel selection module, for impedance matching of the transducer and improvement of the transducer's conversion efficiency.

[0025] Furthermore, the TDC metering module includes a high-frequency crystal oscillator Y1 and a low-frequency crystal oscillator Y2. Y1 and a first matching resistor R2 form a high-frequency crystal oscillator circuit, while Y2, a first matching capacitor C15 or a second matching capacitor C18, and a second matching resistor R12 form a low-frequency crystal oscillator circuit. The low-frequency crystal oscillator is used to calibrate the clock of the high-frequency crystal oscillator, ensuring the accuracy of time measurement. The Y1 parameter can be selected as 4MHz, and the Y2 parameter can be selected as 32.768kHz.

[0026] The TDC metering module also includes an adjustable voltage multiplier circuit. This circuit adjusts the voltage boost factor via a voltage multiplier capacitor to enhance the excitation signal strength and improve signal transmission distance and quality. Specifically, capacitors C4 / C6 / C7 / C11 / C12 are voltage multiplier capacitors for the TDC metering chip. Combined with internal chip components, they form the excitation signal voltage multiplier circuit, allowing adjustment of the excitation signal voltage according to different pipeline sizes. The voltage multiplier adjustment is achieved through different configurations within the metering chip. In one embodiment, the metering chip includes a switching device, which, along with the voltage multiplier capacitor, adjusts the voltage multiplier. The third resistor, LX31, is a voltage multiplier shorting point. When LX31 is connected, the excitation signal voltage remains at the original input voltage without voltage multiplication. When LX31 is disconnected, the excitation signal voltage is boosted to a higher voltage level by the voltage multiplier circuit, enhancing the transducer's excitation effect. The voltage multiplier function can be flexibly selected under different operating conditions to optimize device performance and power consumption.

[0027] The external filtering circuit of the TDC metering module includes an external filtering circuit for the echo signal and an external filtering circuit for the analog power supply of the metering chip. The TDC metering module uses AVCC power. The external filtering circuit for the echo signal consists of a fourth resistor R10, a fifth resistor R11, a first capacitor C13, and a second capacitor C14 to reduce interference. The reference voltage is stabilized by a third capacitor C17 and a fourth capacitor C19. The external filtering circuit for the analog power supply of the metering chip consists of a fifth capacitor C8, a sixth capacitor C9, a seventh capacitor C10, and a sixth resistor R3 to ensure stable operation of the metering chip. Specifically, the fifth capacitor C8, the sixth capacitor C9, and the seventh capacitor C10 are connected in parallel, with one end connected to the sixth resistor R3 and the other end grounded.

[0028] The channel selection module includes two four-channel analog switch chips and their power supply filter capacitors, used to switch the operating states of different groups of transducers. This module shares the same AVCC power supply as the TDC metering module to reduce interference in the path. The two NO pins of the first analog switch chip are connected to the upstream signal transceiver terminals of the TDC metering module, and the other two pins are connected to the downstream signal transceiver terminals of the TDC metering module. The two COM pins are connected to the upstream and downstream of group A transducers, and the other two COM pins are connected to the upstream and downstream of group B transducers. The NC pin is grounded, and the IN pin is connected to the control port of the MCU control module. The pin connections of the analog switch chips and transducers can be designed and adjusted according to specific requirements.

[0029] According to one embodiment, such as Figure 3As shown, pins NO1 and NO4 of the first analog switch chip are connected to the downstream signal transceiver of the TDC metering module, pins NO2 and NO3 are connected to the upstream signal transceiver of the TDC metering module, pins COM1 and COM2 are connected to the upstream and downstream of transducers in group A, respectively, pins COM3 and COM4 are connected to the upstream and downstream of transducers in group B, pins NC1, NC2, NC3, and NC4 are grounded, and pins IN12 and IN34 are connected to two control pins of the MCU control module. In this embodiment, there are four groups of transducers. Similarly, groups C and D transducers switch channels via the second analog switch chip. The switching frequency of the four groups of transducers is controlled by the MCU control module. Each group of transducers is responsible for the flow measurement of one channel. By switching the channel selection module, multi-channel flow measurement can be achieved, thereby improving measurement accuracy and reliability.

[0030] The power supply module includes a reverse connection protection module, a controllable LDO module, an uncontrollable LDO module, and a filter capacitor. It converts the voltage output from the lithium battery to provide the required voltage for the entire device, ensuring the normal operation of each module.

[0031] The display module is connected to the MCU control module and uses a segment LCD to display water flow information, equipment operating status, etc., so that users can intuitively understand the working status of the water meter.

[0032] In addition, this device also includes a pulse detection module 7, such as Figure 4 As shown, the pulse meter testing module includes an optocoupler isolation module, a diode, and a resistor. The positive emitter of the optocoupler isolation module is connected to the control pin of the MCU via the seventh resistor R42, and the negative emitter is grounded. The collector (C) of the receiver is connected to the positive terminal of the external power supply via the eighth resistor R41, and the emitter (E) is used to detect the level status. A diode D is added between the collector (C) and emitter (E) to achieve internal and external electrical isolation, meet the meter testing requirements without protocol connection, and prevent damage to the circuit when the external power supply is reversed.

[0033] This device also includes a remote transmission module 8, which uses NB-IoT (Narrowband Internet of Things) wireless communication technology to realize data transmission between the water meter and the host computer. It features low power consumption and wide coverage, making it suitable for remote meter reading applications. When data needs to be uploaded, the MCU activates the remote transmission module, using the NB-IoT network to send data such as flow rate and voltage to the host computer. After the upload is complete, the remote transmission module is turned off to save power.

[0034] Upon device startup, the MCU first initializes each module, checks battery voltage, and sets the operating parameters for each module. The TDC metering module periodically collects water flow velocity data, improves signal quality through an adjustable voltage multiplier and filter circuit, and then sends the data to the MCU. The channel selection module switches between different transducers according to MCU instructions to ensure flow field uniformity, thereby improving overall metering accuracy. Users can view real-time flow rate, historical data, and other information through the display module; the operation is simple and intuitive. If an anomaly is detected (such as low battery voltage or communication failure), the MCU will immediately take corresponding measures and store the abnormal status information in its internal memory for subsequent analysis.

[0035] The foregoing has shown and described the basic principles and main features of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this utility model.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-channel, large-diameter intelligent ultrasonic water meter device, characterized in that, include The MCU control module is used to manage the various modules. The TDC metering module collects water flow information and sends it to the MCU control module. The channel selection module switches the operating status of multiple transducers via an analog switch. Multiple transducers, combined with a channel selection module, enable multi-channel flow measurement; The power supply module provides power to each module of the device. The display module, connected to the MCU control module, is used to display flow information and device operating status.

2. The multi-channel, large-diameter intelligent ultrasonic water meter device according to claim 1, characterized in that, The TDC metering module includes a TDC metering chip, an adjustable voltage multiplier circuit, a high-frequency crystal oscillator, a low-frequency crystal oscillator, and an external filter circuit. The excitation and transceiver pins of the TDC metering chip are connected to the NO pin of the channel selection module via resistors. The adjustable voltage multiplier circuit includes a voltage multiplier capacitor, which adjusts the voltage boost factor. The low-frequency crystal oscillator is used to calibrate the clock of the high-frequency crystal oscillator.

3. The multi-channel, large-diameter intelligent ultrasonic water meter device according to claim 1, characterized in that, The channel selection module includes two four-channel analog switch chips and their power supply filter capacitors. The two NO pins of the first analog switch chip are connected to the upstream signal transceiver terminals of the TDC metering module, and the other two NO pins are connected to the downstream signal transceiver terminals of the TDC metering module. The COM pin is connected to the upstream and downstream of the transducers of group A and group B, respectively. The NC pin is grounded, and the IN pin is connected to the control port of the MCU control module.

4. The multi-channel, large-diameter intelligent ultrasonic water meter device according to claim 2, characterized in that, The high-frequency crystal oscillator and the first matching resistor form a high-frequency crystal oscillator circuit, and the low-frequency crystal oscillator, the matching capacitor, and the second matching resistor form a low-frequency crystal oscillator circuit; the external filtering circuit includes an external filtering circuit for the echo signal and an external filtering circuit for the analog power supply of the metering chip, and the external filtering circuit for the echo signal includes resistive and capacitive components and a voltage stabilizing capacitor.

5. A multi-channel, large-diameter intelligent ultrasonic water meter device according to claim 4, characterized in that, The external filtering circuit for the echo signal consists of a fourth resistor, a fifth resistor, a first capacitor, and a second capacitor. The reference voltage of the echo signal is stabilized by the third and fourth capacitors. The external filtering circuit for the analog power supply of the metering chip consists of a fifth, a sixth, a seventh capacitor, and a sixth resistor.

6. The multi-channel, large-diameter intelligent ultrasonic water meter device according to claim 1, characterized in that, The device also includes a pulse detection module, which includes an optocoupler isolation module, a diode, and a resistor. The positive emitter of the optocoupler isolation module is connected to the control pin of the MCU via a seventh resistor, the negative emitter is grounded, the collector (C) of the receiver is connected to the positive terminal of an external power supply via an eighth resistor, and the emitter (E) of the receiver is used to detect the level status. A diode is added between the collector (C) and emitter (E) of the receiver.

7. A multi-channel, large-diameter intelligent ultrasonic water meter device according to claim 1, characterized in that, The device also includes a remote transmission module, which uses NB-IoT wireless communication technology for data transmission between the water meter and the host computer.

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