CN112067067A - Ultrasonic flowmeter capable of checking and metering - Google Patents
Ultrasonic flowmeter capable of checking and metering Download PDFInfo
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- CN112067067A CN112067067A CN202010982384.7A CN202010982384A CN112067067A CN 112067067 A CN112067067 A CN 112067067A CN 202010982384 A CN202010982384 A CN 202010982384A CN 112067067 A CN112067067 A CN 112067067A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/13—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a reference counter
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses an ultrasonic flowmeter capable of checking and metering, which comprises an ultrasonic flowmeter shell, an ultrasonic transducer, a reflector plate and a reflector plate bracket, wherein the reflector plate and the reflector plate bracket are arranged below the ultrasonic transducer, and the ultrasonic flowmeter is characterized in that: the ultrasonic transducers comprise a signal generating circuit, a signal receiving circuit, a phase detection circuit, a phase voltage conversion circuit and a flow measurement verification unit, wherein the phase detection circuit compares a received ultrasonic signal with a reference signal to obtain a phase difference, the phase voltage conversion circuit converts the phase difference into voltage data, and the flow measurement verification unit calculates a flow verification value according to the difference between the receiving moments of the ultrasonic signals received by the two ultrasonic transducers and the difference between the voltage data obtained by the two phase voltage conversion circuits. The invention solves the problem of how to quickly and effectively test the metering result of the ultrasonic flowmeter.
Description
Technical Field
The invention belongs to the technical field of intelligent ultrasonic water meters, and particularly relates to an ultrasonic flowmeter capable of verifying and metering.
Background
Ultrasonic transducer chips used in ultrasonic flow meters currently on the market, such as the flow meter proposed in chinese patent publication CN102869959B "ultrasonic flow meter", comprise a switching unit for switching an electrical transmission signal between a signal generator and at least two ultrasonic transducers and for switching an electrical reception signal between the transducers and a receiver circuit, wherein the switching unit is coupled to an output of an operational amplifier of the signal generator and to an inverting input of an operational amplifier of the receiver circuit, and a method of determining a time delay of an ultrasonic signal in a flow path of an ultrasonic flow meter, comprising the step of comparing a physically transmitted, delayed and received signal with a simulated non-delayed signal. Chinese patent CN102200457B, "an ultrasonic flow detection circuit", proposes that during the measurement process, an ultrasonic source signal generating circuit generates a 1MHZ signal to continue the whole forward and backward flow measurement process, an ultrasonic transducer receives the ultrasonic signal, then the noise and interference signals are filtered out by a detection circuit, the signal is compared with a reference signal by a phase detection circuit to generate a phase difference, the measurement signal is converted into a voltage signal by a "phase-voltage" conversion circuit, and finally the voltage value is measured by a high-precision AD of a microprocessor. Because the speed of the ultrasonic wave in forward and backward flow propagation is different, the finally measured voltage amplitude is also different, the time difference can be obtained through the conversion of the voltage difference of the two, and the flow can be calculated through a corresponding formula.
However, the technical scheme has no technical characteristic of verifying the metering result of the ultrasonic flowmeter, and the metering problem of the flowmeter is difficult to find quickly and accurately. At present, an ultrasonic flowmeter for quickly and effectively checking the metering result of the ultrasonic flowmeter does not exist, and a metering verification ultrasonic flowmeter is provided for the purpose.
Disclosure of Invention
In order to solve the above problems, the present invention provides an ultrasonic flow meter capable of verifying measurement.
The invention discloses an ultrasonic flowmeter capable of verifying and metering, which comprises an ultrasonic water meter shell, an ultrasonic transducer, a reflector plate and a reflector plate bracket, wherein the reflector plate and the reflector plate bracket are arranged below the ultrasonic transducer, and the ultrasonic flowmeter is characterized in that:
the ultrasonic transducers comprise a signal generating circuit, a signal receiving circuit, a phase detection circuit, a phase voltage conversion circuit and a flow measurement verification unit, wherein the phase detection circuit compares a received ultrasonic signal with a reference signal to obtain a phase difference, the phase voltage conversion circuit converts the phase difference into voltage data, and the flow measurement verification unit calculates a flow verification value according to the difference between the receiving moments of the ultrasonic signals received by the two ultrasonic transducers and the difference between the voltage data obtained by the two phase voltage conversion circuits.
Preferably, the signal receiving circuit includes any one or more combination of a signal amplifying circuit (amplifier), a signal filtering circuit (comparator).
Further preferably, after the signal receiving circuit receives the ultrasonic signal, any one or more combinations of amplification and/or filtering of the ultrasonic signal and/or filtering of the interference signal and/or filtering of the noise are performed on the ultrasonic signal.
Preferably, the phase detection circuit includes a waveform comparator for detecting the waveform of the received ultrasonic signal and a waveform of a reference signal, and the microprocessor calculates a difference between phases of the two waveforms of the ultrasonic signal, and the reference signal is the ultrasonic signal generated by the signal generation circuit.
Preferably, the phase voltage conversion circuit is a pulse width detection circuit; the phase-voltage conversion circuit converts the phase difference into voltage data, detects pulse width variation caused by the phase difference, and calculates the voltage data according to a pulse width modulation method.
Preferably, the phase voltage conversion circuit is a capacitance discharge circuit; the phase-voltage conversion circuit converts the phase difference into voltage data, detects a discharge time difference caused by the phase difference, and calculates the voltage data according to the discharge time difference.
Preferably, the flow rate measurement and verification unit calculates a flow rate verification value according to a difference between receiving times at which the two ultrasonic transducers receive the ultrasonic signals and a difference between voltage data obtained by the two phase-voltage conversion circuits, and includes:
the flow measurement and verification unit calculates the difference of the ultrasonic receiving time according to the difference of the receiving time of the ultrasonic signals received by the two ultrasonic transducers and calculates the current flow value;
judging whether the data are matched or not according to the difference of the ultrasonic receiving time and the difference of the voltage data obtained by the two phase-voltage conversion circuits;
if the data are not matched, the flow verification value is calculated according to the difference between the ultrasonic receiving time and the voltage data.
Further preferably, the determining whether the data match or not based on the difference between the ultrasonic wave reception timings and the difference between the voltage data obtained by the two phase-voltage conversion circuits includes:
obtaining the ratio of the difference of the ultrasonic receiving time and the voltage data difference under the standard flow according to the influence of the fluid on the ultrasonic transmission, and recording the ratio as a standard ratio;
calculating the ratio of the difference between the current ultrasonic receiving time and the difference between the voltage data obtained by the two phase-voltage conversion circuits;
and if the deviation of the ratio of the difference between the current ultrasonic wave receiving time and the difference between the voltage data obtained by the two phase-voltage conversion circuits and the standard ratio is larger than a set threshold value, judging that the data are not matched.
Further preferably, the calculating a flow verification value according to the difference between the ultrasonic wave reception times and the difference between the voltage data includes:
calculating a correction coefficient according to a ratio of a difference between ultrasonic wave reception timings and a difference between voltage data;
and calculating a flow check value according to the current flow value and the correction coefficient.
The method and the system have the advantages that:
(1) two different signal metering circuits are adopted in the ultrasonic transducer, one is a circuit for calculating the receiving time delay of an ultrasonic signal, and the other is a circuit for calculating the voltage difference of ultrasonic phase representation, and the two signal metering circuits can share the circuit and can judge whether the ultrasonic flow metering result is accurate or not through comparison.
(2) The measurement result of the ultrasonic flow can be effectively verified by comparing the difference between the receiving time of the forward flow signal and the receiving time of the reverse flow signal with the voltage difference represented by the ultrasonic phase.
Drawings
FIG. 1 is a schematic diagram of a circuit logic structure of a verifiable metrology ultrasonic flow meter transducer in accordance with an embodiment of the present invention;
fig. 2 is a flowchart of the steps of calculating a flow check value according to an embodiment of the present invention.
Detailed Description
The following describes in detail preferred embodiments of the present invention.
The embodiment of the invention discloses an ultrasonic flowmeter capable of verifying and metering, which comprises an ultrasonic water meter shell, an ultrasonic transducer, a reflector plate and a reflector plate bracket, wherein the reflector plate and the reflector plate bracket are arranged below the ultrasonic transducer, and the ultrasonic flowmeter is characterized in that:
the ultrasonic transducer comprises a signal generating circuit, a signal receiving circuit, a phase detection circuit, a phase voltage conversion circuit and a flow measurement checking unit, wherein the signal receiving circuit receives and processes ultrasonic signals, the phase detection circuit compares the received ultrasonic signals with reference signals to obtain phase differences, the phase voltage conversion circuit converts the phase differences into voltage data, and the flow measurement checking unit calculates a flow check value according to the difference between the receiving moments of the ultrasonic signals received by the two ultrasonic transducers and the difference between the voltage data obtained by the two phase voltage conversion circuits. The schematic circuit structure of the transducer is shown in fig. 1.
Preferably, the signal receiving circuit includes any one or more combination of a signal amplifying circuit (amplifier), a signal filtering circuit (comparator). The signal receiving circuit shown in the circuit structure diagram of fig. 1 includes a signal amplifier and a signal filter circuit, wherein the signal filter circuit uses a high-speed comparator for detecting the pulse level of the analog signal and the magnitude of the reference voltage, and all signals lower than the reference voltage are filtered out.
Preferably, after the signal receiving circuit receives the ultrasonic signal, any one or more combinations of amplification and/or filtering of the ultrasonic signal and/or filtering of interference signals and/or filtering of noise are performed on the ultrasonic signal. In this embodiment, the amplification is to amplify the ultrasonic signal through an amplification circuit, and the filtering of the interference signal or the filtering of the noise is to filter the interference signal or the noise according to the difference between the pulse level of the interference signal or the noise and the pulse level of the normal ultrasonic signal.
Preferably, the phase detection circuit includes a waveform comparator for detecting the waveform of the received ultrasonic signal and a waveform of a reference signal, and the microprocessor calculates a difference between phases of the two waveforms of the ultrasonic signal, and the reference signal is the ultrasonic signal generated by the signal generation circuit. In this embodiment, the ultrasonic signal generated by the signal generating circuit is directly input to the phase detecting circuit, and is compared with the waveform of the received ultrasonic signal, and the microprocessor obtains the phase difference value according to the waveform comparison.
In a preferred embodiment, the phase voltage conversion circuit is a pulse width detection circuit; the phase-voltage conversion circuit converts the phase difference into voltage data, detects pulse width variation caused by the phase difference, and calculates the voltage data according to a pulse width modulation method. In this embodiment, the phase-voltage conversion circuit employs a pulse width detection circuit, the phase difference is represented in the form of a pulse width in a signal, and voltage data can be effectively calculated by a pulse width modulation method.
In another preferred embodiment, the phase voltage converting circuit is a capacitor discharging circuit; the phase-voltage conversion circuit converts the phase difference into voltage data, detects a discharge time difference caused by the phase difference, and calculates the voltage data according to the discharge time difference. In this embodiment, the phase-voltage conversion circuit employs a capacitor discharge circuit, and the discharge time of capacitors connected with different phase differences is different, so that voltage data can be effectively calculated according to the discharge time difference.
In another preferred embodiment, the voltage data converted corresponding to the phase difference is calculated according to the combination (average value, extreme value, difference value, ratio value, etc.) of the data obtained by pulse width modulation and the discharge time difference data.
Preferably, the flow rate measurement and verification unit calculates a flow rate verification value according to a difference between receiving times at which the two ultrasonic transducers receive the ultrasonic signals and a difference between voltage data obtained by the two phase-voltage conversion circuits, and a flowchart is shown in fig. 2, and includes the steps of:
the flow measurement and verification unit calculates the difference of the ultrasonic receiving time according to the difference of the receiving time of the ultrasonic signals received by the two ultrasonic transducers and calculates the current flow value;
judging whether the data are matched or not according to the difference of the ultrasonic receiving time and the difference of the voltage data obtained by the two phase-voltage conversion circuits;
if the data are not matched, the flow verification value is calculated according to the difference between the ultrasonic receiving time and the voltage data.
In this embodiment, the two ultrasonic transducers receive the ultrasonic signalT is the difference in time0Indicating, calculating the current flow value
Where D represents the flow meter bore, L represents the distance between the two ultrasonic transducers, and Vs represents the propagation velocity of the ultrasonic waves in the water.
The method for judging whether the data are matched or not according to the difference between the ultrasonic receiving time and the difference between the voltage data obtained by the two phase-voltage conversion circuits comprises the following steps:
obtaining the ratio of the difference of the ultrasonic receiving time and the voltage data difference under the standard flow according to the influence of the fluid on the ultrasonic transmission, and recording the ratio as a standard ratio;
calculating the ratio of the difference between the current ultrasonic receiving time and the difference between the voltage data obtained by the two phase-voltage conversion circuits;
and if the deviation of the ratio of the difference between the current ultrasonic wave receiving time and the difference between the voltage data obtained by the two phase-voltage conversion circuits and the standard ratio is larger than a set threshold value, judging that the data are not matched.
In a preferred embodiment, the ratio of the difference between the ultrasonic receiving moments and the voltage data difference under the standard flow, namely the standard ratio P, is obtained through the influence of the fluid temperature and the fluid flat temperature on the ultrasonic propagation; and calculating the ratio P of the difference between the current ultrasonic receiving time and the difference between the voltage data obtained by the two phase-voltage conversion circuits, and judging that the data are not matched if | P-P | > X, wherein X is a preset threshold value. In this embodiment, the standard ratio P is 2, the ratio P between the difference between the current ultrasonic wave reception times and the difference between the voltage data obtained by the two phase-voltage conversion circuits is 3, the preset threshold value X is 0.2, and when | P-P | > 1>0.2, it is determined that the data do not match.
The method for calculating the flow check value according to the difference between the ultrasonic receiving time and the voltage data comprises the following steps:
calculating a correction coefficient according to a ratio of a difference between ultrasonic wave reception timings and a difference between voltage data;
and calculating a flow check value according to the current flow value and the correction coefficient.
In a preferred embodiment, when | P-P | > X determines that the data do not match, a correction coefficient m, which is k1 · | P-P |, where k1 is a calculation coefficient set in advance, is calculated from a ratio P of a difference between the ultrasonic wave reception timings and a difference between the voltage data. In the present embodiment, the ratio P of the difference between the ultrasonic wave reception timings and the difference between the voltage data is 3, the standard ratio P is 2, the calculation coefficient k1 set in advance is 0.3, and the calculation correction coefficient m is k1 · | P-P | -0.3 × |3-2| -0.3.
In another preferred embodiment, when | P-P tint>When the X determination data is not matched, a correction coefficient m is calculated according to the ratio p of the difference of the ultrasonic wave receiving time and the difference of the voltage data, and the correction coefficient m
Where k2 is a calculation coefficient set in advance. In this embodiment, the ratio P of the difference between the ultrasonic wave reception timings and the difference between the voltage data is 3, the standard ratio P is 2, the previously set calculation coefficient k2 is 0.6, and the correction coefficient is calculated
In another preferred embodiment, when | P-P tint>When the X determination data is not matched, a correction coefficient m is calculated according to the ratio p of the difference of the ultrasonic wave receiving time and the difference of the voltage data, and the correction coefficient m
Where k3, k4 are calculation coefficients set in advance and k4>1. In this embodiment, the ratio P of the difference between the ultrasonic wave reception timings and the difference between the voltage data is 3, the standard ratio P is 2, the previously set calculation coefficient k3 is 1.2, the previously set calculation coefficient k4 is 2, and the correction coefficient is calculated
According to the current flow value Q0And calculating a flow check value q by the correction coefficient m.
In a preferred embodiment, the calculated flow check value Q is g1 · m · Q0Where g1 is a calculation coefficient set in advance. In this embodiment, the current flow rate value Q0The preset calculation coefficient g1 is 3, the correction coefficient m is 0.3, and the calculated flow check value Q is g1 m.q0＝3×0.3×10＝9。
In another preferred embodiment, the calculated flow check value Q is g2 · m · Q0+g3·Q0Wherein g2, g3 are calculation coefficients set in advance. In this embodiment, the current flow rate value Q0The preset calculation coefficient g2 is 0.8, g3 is 0.7, and the correction coefficient m is 0.3, and the calculated flow check value Q is g2 · m · Q · 100+g3·Q0＝0.8×0.3×10+0.7×10＝9.4。
Of course, those skilled in the art should realize that the above embodiments are only used for illustrating the present invention, and not as a limitation to the present invention, and that the changes and modifications of the above embodiments will fall within the protection scope of the present invention as long as they are within the scope of the present invention.
Claims (10)
1. The utility model provides an ultrasonic flowmeter who can check up measurement, includes ultrasonic flowmeter casing, ultrasonic transducer, reflector plate and reflector plate support of ultrasonic transducer below, its characterized in that: the ultrasonic transducers comprise a signal generating circuit, a signal receiving circuit, a phase detection circuit, a phase voltage conversion circuit and a flow measurement verification unit, wherein the phase detection circuit compares a received ultrasonic signal with a reference signal to obtain a phase difference, the phase voltage conversion circuit converts the phase difference into voltage data, and the flow measurement verification unit calculates a flow verification value according to the difference between the receiving moments of the ultrasonic signals received by the two ultrasonic transducers and the difference between the voltage data obtained by the two phase voltage conversion circuits.
2. An ultrasonic flow meter of verifiable metering according to claim 1, where the signal receiving circuitry comprises any one or combination of signal amplification circuitry, signal filtering circuitry.
3. An ultrasonic flow meter of verifiable metering according to claim 2, wherein the signal receiving circuitry, upon receiving the ultrasonic signal, amplifies the ultrasonic signal and/or filters out interfering signals and/or filters out any one or more combinations of noise.
4. A verifiable metering ultrasonic flow meter according to claim 1, wherein the phase detection circuit comprises a waveform comparator for comparing the received ultrasonic signal waveform with a reference signal waveform and a microprocessor for calculating the difference in phase of the two signal waveforms.
5. A verifiable metering ultrasonic flow meter according to claim 4, wherein the reference signal is an ultrasonic signal generated by a signal generating circuit.
6. A verifiable metering ultrasonic flow meter according to claim 1, wherein the phase voltage conversion circuit is a pulse width detection circuit; the phase-voltage conversion circuit converts the phase difference into voltage data, detects pulse width variation caused by the phase difference, and calculates the voltage data according to a pulse width modulation method.
7. A verifiable metering ultrasonic flow meter according to claim 1, wherein the phase voltage conversion circuit is a capacitive discharge circuit; the phase-voltage conversion circuit converts the phase difference into voltage data, detects a discharge time difference caused by the phase difference, and calculates the voltage data according to the discharge time difference.
8. An ultrasonic flow meter for verifiable metering according to claim 1, wherein the flow meter verification unit calculates the flow verification value according to the difference between the receiving time of the ultrasonic signals received by the two ultrasonic transducers and the difference between the voltage data obtained by the two phase-voltage conversion circuits, comprising the steps of:
the flow measurement and verification unit calculates the current flow value according to the difference between the receiving moments of the ultrasonic signals received by the two ultrasonic transducers;
judging whether the data are matched or not according to the difference of the ultrasonic receiving time and the difference of the voltage data obtained by the two phase-voltage conversion circuits;
if the data are not matched, the flow verification value is calculated according to the difference between the ultrasonic receiving time and the voltage data.
9. An ultrasonic flow meter capable of verifying measurement according to claim 8, wherein the judgment of whether the data match or not based on the difference between the ultrasonic reception timings and the difference between the voltage data obtained by the two phase-voltage conversion circuits comprises:
obtaining the ratio of the difference of the ultrasonic receiving time and the voltage data difference under the standard flow according to the influence of the fluid on the ultrasonic transmission, and recording the ratio as a standard ratio;
calculating the ratio of the difference between the current ultrasonic receiving time and the difference between the voltage data obtained by the two phase-voltage conversion circuits;
and if the deviation of the ratio of the difference between the current ultrasonic wave receiving time and the difference between the voltage data obtained by the two phase-voltage conversion circuits and the standard ratio is larger than a set threshold value, judging that the data are not matched.
10. An ultrasonic flow meter of verifiable metering according to claim 8, wherein the calculating of the flow verification value from the difference between the ultrasonic reception times and the difference between the voltage data comprises the steps of:
calculating a correction coefficient according to a ratio of a difference between ultrasonic wave reception timings and a difference between voltage data;
and calculating a flow check value according to the current flow value and the correction coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010982384.7A CN112067067A (en) | 2020-09-17 | 2020-09-17 | Ultrasonic flowmeter capable of checking and metering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010982384.7A CN112067067A (en) | 2020-09-17 | 2020-09-17 | Ultrasonic flowmeter capable of checking and metering |
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| Publication Number | Publication Date |
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| CN112067067A true CN112067067A (en) | 2020-12-11 |
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| CN202010982384.7A Withdrawn CN112067067A (en) | 2020-09-17 | 2020-09-17 | Ultrasonic flowmeter capable of checking and metering |
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| CN (1) | CN112067067A (en) |
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- 2020-09-17 CN CN202010982384.7A patent/CN112067067A/en not_active Withdrawn
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Application publication date: 20201211 |