Flowmeter on-line monitoring and diagnosing system

Abstract

The utility model provides an on-line monitoring and diagnosing system for a flowmeter, and belongs to the technical field of monitoring and diagnosing systems. Comprising a master control circuit, a power circuit, a diagnosis circuit and an indication circuit. The power supply circuit provides direct current for the main control circuit, the diagnosis circuit and the indication circuit, the power supply circuit comprises an alternating current voltage reduction unit, a first voltage stabilization unit, a second voltage stabilization unit and a signal isolation unit, and the alternating current voltage reduction unit is used for reducing the voltage of an alternating current power supply and converting the reduced alternating current into the direct current; the output voltage can be finely adjusted by adjusting the potentiometer R5, the voltage output from the chip LM is input into the voltage stabilizer WD, after the voltage is further stabilized by the voltage stabilizer WD, stable direct-current voltage is output from a pin Vout of the voltage stabilizer WD to be used by the single-chip microcomputer UF, the smooth and stable direct-current voltage can guarantee normal work of the single-chip microcomputer UF, the photoelectric coupler U1 can electrically isolate external signals, and the output voltage of the single-chip microcomputer UF is greatly improved. The anti-interference capability of the circuit is enhanced, and the internal circuit is protected, so that the monitoring and diagnosis system can work continuously and stably.

Description

Flowmeter Online Monitoring and Diagnostic System Technical Field

[0001] This utility model relates to the field of monitoring and diagnostic system technology, and in particular to an online monitoring and diagnostic system for flow meters. Background Technology

[0002] An online flowmeter monitoring and diagnostic system is an intelligent system for real-time monitoring and diagnosis of flowmeter operation. The flowmeter senses fluid flow and converts it into an electrical signal. The data acquisition module digitizes this signal and transmits it. The monitoring and diagnostic center uses algorithms to analyze the data, comparing it with historical data and standard parameters to determine the flowmeter's operating status and fluid conditions. Through sensors, a data acquisition module, and a software platform, it enables the monitoring of flowmeter operating parameters, fault warnings, and performance evaluation, ensuring the accuracy and stability of the flowmeter. It primarily collects real-time operating data such as flow rate, pressure, and temperature; monitors the flowmeter's operating status, such as signal strength and battery level; identifies abnormal conditions through data analysis, such as zero-point drift and signal loss, providing fault warnings and diagnostic reports to help users quickly locate problems; stores historical data, supports data export and report generation, and optimizes flowmeter usage and maintenance strategies through big data analysis.

[0003] Online flow meter monitoring and diagnostic systems require internal power circuits to convert AC power into DC power for use by other components in the system. Traditional power circuits often lack suitable capacitors for filtering the rectifier bridge, resulting in an inability to provide a smooth voltage, weak output signal, susceptibility to external signal interference, and an inability to provide stable DC power, thus affecting the stability of the online flow meter monitoring and diagnostic system. Summary of the Invention

[0004] In view of this, the present invention aims to propose an online monitoring and diagnostic system for flow meters to solve the problems mentioned in the background art, such as the inability of traditional power supply circuits to provide smooth voltage, susceptibility to interference from external signals, and inability to provide stable DC power.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: an online monitoring and diagnostic system for flow meters, comprising:

[0006] The main control circuit is used to process and operate the input signal, and transmit the processed signal to the diagnostic circuit.

[0007] The power supply circuit provides DC power to the main control circuit, diagnostic circuit, and indicator circuit. The power supply circuit includes an AC step-down unit, a first voltage regulator unit, a second voltage regulator unit, and a signal isolation unit. The AC step-down unit is used to step down the AC power supply and convert the stepped-down AC power into DC power. The first voltage regulator unit is used to perform initial voltage regulation on the DC power. The second voltage regulator unit is used to perform secondary voltage regulation on the DC power. The signal isolation unit is used to perform noise reduction processing on the regulated DC power.

[0008] A diagnostic circuit is used to receive signals from the main control circuit and display the signals.

[0009] An indicator circuit is provided to indicate whether the circuitry of the flowmeter online monitoring and diagnostic system has malfunctioned.

[0010] Furthermore, the AC step-down unit includes a transformer CT and a rectifier bridge DB; the first voltage regulator unit includes a voltage regulator chip LM, capacitors C3 and C4, resistor R4 and potentiometer R5; the second voltage regulator unit includes a voltage regulator WD, capacitors C5 and C6, resistors R8 and R9; and the signal isolation unit includes an optocoupler U1, resistor R1 and switch A2.

[0011] Furthermore, resistor R1 is connected to pin 1 of optocoupler U1, pin 4 of optocoupler U1 is connected to resistor R8 through switch A2, resistor R9 is connected in series with capacitor C6, resistor R8 is connected in series with capacitor C5, pin Vin of voltage regulator WD is connected to both resistor R8 and resistor R9, pin Vout of voltage regulator WD is connected to the main control circuit, and GND of voltage regulator WD is grounded.

[0012] Furthermore, resistor R4 and potentiometer R5 are connected in series with voltage regulator chip LM, capacitor C4 is connected in parallel with resistor R4 and potentiometer R5, rectifier bridge DB is connected in series between transformer CT and voltage regulator chip LM, transformer CT steps down the external AC power, and rectifier bridge DB converts the stepped-down AC power from transformer CT into DC power, one end of capacitor C3 is connected after rectifier bridge DB and the other end is grounded, capacitor C3 is used to filter DC power, voltage regulator chip LM and voltage regulator WD regulate DC power, and optocoupler U1 is used to isolate external signals.

[0013] Furthermore, the main control circuit includes a microcontroller UF, a chip B1, resistors R2 and R3, a switch A1, and a crystal oscillator unit. The crystal oscillator unit includes a crystal oscillator XT, a capacitor C1, and a capacitor C2. The capacitors C1 and C2 are connected in series with the crystal oscillator XT. The two ends of the crystal oscillator XT are respectively connected to pins 4 and 5 of the microcontroller UF to provide a clock signal for the microcontroller UF.

[0014] Furthermore, pin 1 of chip B1 is connected to pin 7 of microcontroller UF, pin 2 of chip B1 is connected to pin 8 of microcontroller UF, pin 7 of chip B1 is connected to pin 1 of microcontroller UF, one end of resistor R3 is connected to pin 7 of chip B1, and the other end is connected to resistor R2. The end of resistor R2 away from resistor R3 is connected to pin 9 of microcontroller UF. Switch A1 is connected in series between pins 10 and 11 of microcontroller UF, and pin 6 of microcontroller UF is connected to pin Vout of voltage regulator WD.

[0015] Furthermore, the diagnostic circuit includes chip B3, electrocoupler U2, resistor R0, and a six-digit LED display. The six-digit LED display includes LED1 to LED6. The resistor R0 is connected in series between the positive terminal of the diode inside the electrocoupler U2 and pin 8 of chip B1.

[0016] Furthermore, the negative terminal of the diode inside the electrocoupler U2 is connected to pin 16 of the microcontroller UF, the parallel output pins Q1 to Q7 of the chip B3 are respectively connected to the segment selection pins of the six-digit LED display, and the pins OUT1 and OUT2 of the electrocoupler U2 are respectively connected to external devices to isolate the output signal.

[0017] Furthermore, the indicator circuit includes chip B2, light-emitting diodes LED7 and LED8, resistors R6 and R7, and the output terminals Y0 to Y5 of chip B2 are respectively connected to the input pins of the six-digit LED display.

[0018] Furthermore, LED7 is connected in series with resistor R6, LED8 is connected in series with resistor R7, the negative terminal of LED7 is connected to the output terminal Y7 of chip B2, the negative terminal of LED8 is connected to the output terminal Y6 of chip B2, resistors R6 and R7 are both connected to the enable terminals E1 and E3 of chip B2, and the enable terminals E1 and E2 of chip B2 are both grounded.

[0019] Compared with existing technologies, the online monitoring and diagnostic system for flowmeters described in this utility model has the following advantages: The MR pin of chip B3 is a reset pin; when low, it can clear all outputs, and by default, it is in a high-level normal operating state. The output terminals OUT1 and OUT2 of the electrocoupler U2 are respectively connected to external controlled devices, providing stable signals to these devices and preventing external circuit interference from affecting the monitoring and diagnostic circuit. This also protects the circuit components from damage. The transformer CT reduces the AC power to 12.6V, 1.2A and inputs it into the rectifier bridge DB. The rectifier bridge DB converts the AC power into pulsed DC power. The rectified pulsed DC power is connected to a 1000μF electrolytic capacitor C3 for filtering, thereby providing... The smooth voltage waveform reduces voltage fluctuations and provides a more stable DC output voltage. The filtered DC power enters the LM309K voltage regulator chip LM, and the output voltage can be finely adjusted by adjusting potentiometer R5. The 10μF capacitor C4 further filters the voltage, making the output voltage smoother. The voltage output from the chip LM is input to the voltage regulator WD. After further regulation by the voltage regulator WD, a stable DC voltage is output from the Vout pin of the voltage regulator WD to power the microcontroller UF. The smooth and stable DC voltage ensures the normal operation of the microcontroller UF, and the optocoupler U1 can electrically isolate external signals, which not only enhances the circuit's anti-interference capability but also protects the internal circuitry, enabling the flow meter online monitoring and diagnostic system to work continuously and stably. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0021] Figure 1 is the overall circuit diagram of this utility model;

[0022] Figure 2 is a power supply circuit diagram of this utility model. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] As shown in Figures 1 and 2, this utility model is an online monitoring and diagnostic system for flow meters, comprising:

[0026] The main control circuit is used to process and operate the input signal, and transmit the processed signal to the diagnostic circuit.

[0027] The power supply circuit provides DC power to the main control circuit, diagnostic circuit, and indicator circuit. The power supply circuit includes an AC step-down unit, a first voltage regulator unit, a second voltage regulator unit, and a signal isolation unit. The AC step-down unit is used to step down the AC power supply and convert the stepped-down AC power into DC power. The first voltage regulator unit is used to perform initial voltage regulation on the DC power. The second voltage regulator unit is used to perform secondary voltage regulation on the DC power. The signal isolation unit is used to perform noise reduction processing on the regulated DC power.

[0028] A diagnostic circuit is used to receive signals from the main control circuit and display the signals.

[0029] An indicator circuit is provided to indicate whether the circuitry of the flowmeter online monitoring and diagnostic system has malfunctioned.

[0030] The AC step-down unit includes a transformer CT and a rectifier bridge DB. The first voltage regulator unit includes a voltage regulator chip LM, capacitors C3 and C4, resistor R4 and potentiometer R5. The second voltage regulator unit includes a voltage regulator WD, capacitors C5 and C6, resistors R8 and R9. The signal isolation unit includes an optocoupler U1, resistor R1 and switch A2.

[0031] The resistor R1 is connected to pin 1 of the optocoupler U1. Pin 4 of the optocoupler U1 is connected to the resistor R8 via switch A2. Switch A2 is connected in series between pins 10 and 12 of the microcontroller UF. Pin 5 of the optocoupler U1 is connected to pin 9 of the microcontroller UF. Pin 2 of the optocoupler U1 is grounded. The resistor R9 is connected in series with the capacitor C6. The resistor R8 is connected in series with the capacitor C5. Pin Vin of the voltage regulator WD is connected to both resistors R8 and R9. Pin Vout of the voltage regulator WD is connected to the main control circuit. GND of the voltage regulator WD is grounded.

[0032] The resistor R4 and potentiometer R5 are connected in series with the voltage regulator chip LM. The capacitor C4 is connected in parallel with the resistor R4 and potentiometer R5. The rectifier bridge DB is connected in series between the transformer CT and the voltage regulator chip LM. The transformer CT steps down the external AC power. The rectifier bridge DB converts the AC power stepped down by the transformer CT into DC power. One end of the capacitor C3 is connected after the rectifier bridge DB, and the other end is grounded. The capacitor C3 is used to filter the DC power. The voltage regulator chip LM and the voltage regulator WD regulate the DC power. The optocoupler U1 is used to isolate external signals.

[0033] The main control circuit includes a microcontroller UF, a chip B1, resistors R2 and R3, a switch A1, and a crystal oscillator unit. The crystal oscillator unit includes a crystal oscillator XT, a capacitor C1, and a capacitor C2. The capacitors C1 and C2 are connected in series with the crystal oscillator XT. The two ends of the crystal oscillator XT are respectively connected to pins 4 and 5 of the microcontroller UF to provide a clock signal for the microcontroller UF.

[0034] Pin 1 of chip B1 is connected to pin 7 of microcontroller UF; pin 2 of chip B1 is connected to pin 8 of microcontroller UF; pin 7 of chip B1 is connected to pin 1 of microcontroller UF; one end of resistor R3 is connected to pin 7 of chip B1, and the other end is connected to resistor R2; the end of resistor R2 furthest from resistor R3 is connected to pin 9 of microcontroller UF; switch A1 is connected in series between pins 10 and 11 of microcontroller UF; pin 6 of microcontroller UF is connected to pin Vout of voltage regulator WD; pin 3 of chip B1 is connected to pin 17 of microcontroller UF; pin 4 of chip B1 is grounded; pin 5 of chip B1 is connected to pin 18 of microcontroller UF; and pin 6 of chip B1 is connected to pin 19 of microcontroller UF.

[0035] The diagnostic circuit includes chip B3, electrocoupler U2, resistor R0 and a six-digit LED display. The six-digit LED display includes LED1 to LED6. The resistor R0 is connected in series between the positive terminal of the diode inside the electrocoupler U2 and pin 8 of chip B1.

[0036] The negative terminal of the diode inside the electrocoupler U2 is connected to pin 16 of the microcontroller UF. The parallel output pins Q1 to Q7 of the chip B3 are respectively connected to the segment selection pins of the six-digit LED display to enable the six-digit LED display to display the corresponding numbers. Pins OUT1 and OUT2 of the electrocoupler U2 are respectively connected to external devices to isolate the output signal.

[0037] The indicator circuit includes chip B2, LED7, LED8, resistor R6, and resistor R7. The output terminals Y0 to Y5 of chip B2 are respectively connected to the input pins of the six-digit LED display.

[0038] The light-emitting diode LED7 is connected in series with resistor R6, and the light-emitting diode LED8 is connected in series with resistor R7. The cathode of LED7 is connected to the output terminal Y7 of chip B2, and the cathode of LED8 is connected to the output terminal Y6 of chip B2. Resistors R6 and R7 are both connected to the enable terminals E1 and E3 of chip B2. The enable terminals E1 and E2 of chip B2 are both grounded.

[0039] The microcontroller UF is the core control component of the entire system. Through processing and calculating the input signals, it controls LEDs 1-6 of the diagnostic circuit to display corresponding characters, showing the flow meter measurement results. Two 30pF capacitors, C1 and C2, along with a 60MHz crystal oscillator XT, form a crystal oscillator circuit, providing a stable clock signal to the microcontroller UF to ensure its normal operation. Pins A and B of chip B3 are used to receive serial data input, and both pins A and B of chip B3 are connected to pin 2 of the microcontroller UF. Pin CLK of chip B3 is the clock pin, used to control the data shift operation; for each clock pulse input, the data shifts one bit to the right. Pin CLK of chip B3 is connected to the microcontroller UF... Pin 3 of chip B3 is connected to the microcontroller. Pin MR of chip B3 is the reset pin, connected to the positive terminal of the 5V power supply. When low, it can clear all outputs to zero. By default, it is in a high-level normal operating state. The output terminals OUT1 and OUT2 of the electro-coupler U2 are connected to the external controlled devices to provide stable signals to the external controlled devices, prevent external circuit interference from affecting the monitoring and diagnostic circuit, and protect the circuit components from damage. Chip B2 is a 3-to-8 line decoder, that is, the decoder has 3 input lines and 8 output lines. Input terminal A of chip B2 is connected to pin 15 of the microcontroller, input terminal B of chip B2 is connected to pin 14 of the microcontroller, and input terminal C of chip B2 is connected to pin 13 of the microcontroller. Input terminals A, B, and C receive binary encoded signals from the microcontroller UF. Chip B2 will only operate normally when enable terminals E1 and E2 are low and enable terminal E3 is high. Resistors R6 and R7 limit current to prevent damage to LEDs LED7 and LED8 due to excessive current. When chip B2 outputs a low level, LEDs LED7 and LED8 conduct and emit light; when chip B2 outputs a high level, LEDs LED7 and LED8 do not conduct and do not emit light. This allows determination of the operating status of chip B2 and the voltage condition of the indicator circuit. Transformer CT reduces the AC power to 1... A 2.6V, 1.2A AC current is input into the rectifier bridge DB, which converts the AC current into pulsed DC current. The rectified pulsed DC current is connected to a 1000μF electrolytic capacitor C3 for filtering, smoothing the voltage waveform, reducing voltage fluctuations, and outputting a more stable DC voltage. The filtered DC current enters the LM309K voltage regulator chip LM. A 300Ω resistor R4 and a 5kΩ potentiometer R5 form a voltage regulation circuit. The output voltage can be finely adjusted by adjusting the potentiometer R5. The 10μF capacitor C4 further filters the voltage, making the output voltage smoother. The voltage output from the voltage regulator chip LM then passes through resistors R8 and R9, and capacitors C5 (104, i.e., 0.1μF) and C6 (103, i.e., 0.1μF).After processing by a circuit consisting of 0.1μF, the signal is input to a voltage regulator WD. After further regulation by WD, a stable DC voltage is output from pin Vout of WD to power the microcontroller UF. The optocoupler U1 provides electrical isolation for external signals, enhancing the circuit's anti-interference capability and protecting the internal circuitry.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A flow meter online monitoring and diagnostic system, characterized in that, include: The main control circuit is used to process and operate the input signal, and transmit the processed signal to the diagnostic circuit. The power supply circuit provides DC power to the main control circuit, diagnostic circuit, and indicating circuit. The power supply circuit includes an AC step-down unit, a first voltage regulator unit, a second voltage regulator unit, and a signal isolation unit. The AC step-down unit steps down the AC power and converts the stepped-down AC power into DC power. The first voltage regulator unit performs initial voltage regulation on the DC power, the second voltage regulator unit performs secondary voltage regulation on the DC power, and the signal isolation unit performs noise reduction processing on the regulated DC power. The diagnostic circuit receives signals from the main control circuit and displays the signals. The indicating circuit indicates whether the circuit of the flowmeter's online monitoring and diagnostic system has malfunctioned.

2. The flow meter online monitoring and diagnostic system according to claim 1, characterized in that: The AC step-down unit includes a transformer CT and a rectifier bridge DB. The first voltage regulator unit includes a voltage regulator chip LM, capacitors C3 and C4, resistor R4 and potentiometer R5. The second voltage regulator unit includes a voltage regulator WD, capacitors C5 and C6, resistors R8 and R9. The signal isolation unit includes an optocoupler U1, resistor R1 and switch A2.

3. The flow meter online monitoring and diagnostic system according to claim 2, characterized in that: The resistor R1 is connected to pin 1 of the optocoupler U1. Pin 4 of the optocoupler U1 is connected to the resistor R8 through switch A2. The resistor R9 is connected in series with the capacitor C6. The resistor R8 is connected in series with the capacitor C5. The pin Vin of the voltage regulator WD is connected to both the resistor R8 and the resistor R9. The pin Vout of the voltage regulator WD is connected to the main control circuit. The GND of the voltage regulator WD is grounded.

4. The online monitoring and diagnostic system for flow meters according to claim 2, characterized in that: The resistor R4 and potentiometer R5 are connected in series with the voltage regulator chip LM. The capacitor C4 is connected in parallel with the resistor R4 and potentiometer R5. The rectifier bridge DB is connected in series between the transformer CT and the voltage regulator chip LM. The transformer CT steps down the external AC power. The rectifier bridge DB converts the AC power stepped down by the transformer CT into DC power. One end of the capacitor C3 is connected after the rectifier bridge DB, and the other end is grounded. The capacitor C3 is used to filter the DC power. The voltage regulator chip LM and the voltage regulator WD regulate the DC power. The optocoupler U1 is used to isolate external signals.

5. The flow meter online monitoring and diagnostic system according to claim 3, characterized in that: The main control circuit includes a microcontroller UF, a chip B1, resistors R2 and R3, a switch A1, and a crystal oscillator unit. The crystal oscillator unit includes a crystal oscillator XT, a capacitor C1, and a capacitor C2. The capacitors C1 and C2 are connected in series with the crystal oscillator XT. The two ends of the crystal oscillator XT are respectively connected to pins 4 and 5 of the microcontroller UF to provide a clock signal for the microcontroller UF.

6. The online monitoring and diagnostic system for flow meters according to claim 5, characterized in that: Pin 1 of chip B1 is connected to pin 7 of microcontroller UF, pin 2 of chip B1 is connected to pin 8 of microcontroller UF, pin 7 of chip B1 is connected to pin 1 of microcontroller UF, one end of resistor R3 is connected to pin 7 of chip B1, and the other end is connected to resistor R2. The end of resistor R2 away from resistor R3 is connected to pin 9 of microcontroller UF. Switch A1 is connected in series between pins 10 and 11 of microcontroller UF. Pin 6 of microcontroller UF is connected to pin Vout of voltage regulator WD.

7. The flow meter online monitoring and diagnostic system according to claim 1, characterized in that: The diagnostic circuit includes chip B3, electrocoupler U2, resistor R0 and a six-digit LED display. The six-digit LED display includes LED1 to LED6. The resistor R0 is connected in series between the positive terminal of the diode inside the electrocoupler U2 and pin 8 of chip B1.

8. The online monitoring and diagnostic system for flow meters according to claim 7, characterized in that: The negative terminal of the diode inside the electrocoupler U2 is connected to pin 16 of the microcontroller UF. The parallel output pins Q1 to Q7 of the chip B3 are respectively connected to the segment selection pins of the six-digit LED display. Pins OUT1 and OUT2 of the electrocoupler U2 are respectively connected to external devices to isolate the output signal.

9. The online monitoring and diagnostic system for flow meters according to claim 1, characterized in that: The indicator circuit includes chip B2, LED7, LED8, resistor R6, and resistor R7. The output terminals Y0 to Y5 of chip B2 are respectively connected to the input pins of the six-digit LED display.

10. The online monitoring and diagnostic system for flow meters according to claim 9, characterized in that: The light-emitting diode LED7 is connected in series with resistor R6, and the light-emitting diode LED8 is connected in series with resistor R7. The cathode of LED7 is connected to the output terminal Y7 of chip B2, and the cathode of LED8 is connected to the output terminal Y6 of chip B2. Resistors R6 and R7 are both connected to the enable terminals E1 and E3 of chip B2. The enable terminals E1 and E2 of chip B2 are both grounded.

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