CN118089891A - Flow detection method for ultrasonic flowmeter - Google Patents
Flow detection method for ultrasonic flowmeter Download PDFInfo
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- CN118089891A CN118089891A CN202410031182.2A CN202410031182A CN118089891A CN 118089891 A CN118089891 A CN 118089891A CN 202410031182 A CN202410031182 A CN 202410031182A CN 118089891 A CN118089891 A CN 118089891A
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- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 238000005070 sampling Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims description 30
- 238000011144 upstream manufacturing Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 15
- 238000005259 measurement Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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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
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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
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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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- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention provides a flow detection method for an ultrasonic flowmeter, which comprises the steps of detecting and determining a first detection flow value by a first flowmeter group; judging the magnitude relation between the first detection flow value and a first preset flow value and a second preset flow value, wherein the first preset flow value is smaller than the second preset flow value, and the first preset flow value and the second preset flow value are preset values; if the first detected flow value is smaller than or equal to the first preset flow value, the first detected flow value is used as a flow output value; otherwise, acquiring the flow calibration value detected by the second ultrasonic flowmeter group at different sampling frequencies in the sampling period with the same duration, and determining the flow output value based on the first detected flow value and the flow calibration value. The detection method can calibrate and adjust the detection value by adopting different calibration forces under different flow values, and improves the flow calibration detection efficiency and accuracy.
Description
Technical Field
The invention relates to the technical field of flow detection of ultrasonic flow meters, in particular to a flow detection method for an ultrasonic flow meter.
Background
An ultrasonic flow meter (Ultrasonic Flowmeter) is an instrument or device for measuring the flow of a liquid that utilizes ultrasonic technology to achieve a contactless, high-precision flow measurement. Such a flowmeter is suitable for use with a variety of different types of liquids, including water, wastewater, chemicals, petroleum, and the like. The main working principle of the ultrasonic flowmeter comprises:
sensor position: ultrasonic flow meters typically include two transducers, one acting as a transmitter and the other as a receiver. The two sensors are typically mounted at different locations along the conduit, each along the direction of fluid flow.
Ultrasonic wave emission: the transmitter generates an ultrasonic pulse that is transmitted into the fluid. These ultrasonic pulses propagate at a particular frequency. Ultrasonic wave reception: the receiver receives ultrasonic pulses propagated by the fluid. The velocity and flow rate of the fluid have an effect on the propagation velocity of the ultrasonic wave.
Time difference measurement: by measuring the time difference between the ultrasonic pulses transmitted to the receiver, the flow meter can calculate the velocity of the fluid. This time difference is commonly referred to as the "doppler shift".
Flow calculation: based on the Doppler shift and the size and shape of the conduit, the flowmeter can calculate the actual flow.
Ultrasonic flow meters generally have high accuracy and can be adapted for accurate flow measurements, especially at high flow rates and low flow rates. The performance of ultrasonic flow meters is affected by factors such as the characteristics of the fluid in the pipe, the pipe material, and the location of the sensor, and therefore these factors need to be taken into account in the selection and installation of ultrasonic flow meters to obtain accurate measurements.
Ultrasonic flow meters typically have high accuracy in measuring fluid flow, but the accuracy of the measurement may be affected by a variety of factors. The following are some of the main reasons that affect the accuracy of ultrasonic flow meter measurements:
Fluid properties: different types of fluids (e.g., water, oil, chemicals, etc.) have different effects on the propagation velocity of ultrasound. The properties of the fluid, such as temperature, density and viscosity, affect the propagation of ultrasound waves and therefore require correction to take these factors into account.
Flow rate range: the measurement accuracy of ultrasonic flow meters is generally optimal over a range of flow rates. At low and high flow rates, accuracy may be degraded. Therefore, it is very important to select an ultrasonic flowmeter model suitable for application.
Mounting position: proper installation of the ultrasonic sensor is very important. The position, angle and distance of the sensor all affect the accuracy of the measurement. Incorrect mounting may result in attenuation or deflection of the signal.
However, in the existing ultrasonic flowmeter, in the process of monitoring and collecting flow, the detection accuracy of the ultrasonic flowmeter is deviated due to the fact that the ultrasonic signals have differences in propagation speed in a liquid flow medium and an air medium along with the fluctuation process in the pipeline, so that the detection accuracy of the ultrasonic flowmeter is reduced.
Disclosure of Invention
In view of this, the technical problems to be solved by the present invention are: how to provide a flow rate detection method for an ultrasonic flowmeter to improve the flow rate detection accuracy of a liquid flow when an underfill pipe is flowing.
In order to achieve the above object, the present invention provides a flow rate detection method for an ultrasonic flow meter, comprising: determining a first detected flow value by the first flowmeter array detection; judging the magnitude relation between the first detection flow value and a first preset flow value and a second preset flow value, wherein the first preset flow value is smaller than the second preset flow value, and the first preset flow value and the second preset flow value are preset values; if the first detected flow value is smaller than or equal to the first preset flow value, the first detected flow value is used as a flow output value; and if the first detection flow value is larger than the first preset flow value, acquiring flow calibration values detected by a second flow meter group in different sampling frequencies in the sampling period with the same duration, and determining a flow output value based on the first detection flow value and the flow calibration values.
Further, the first flowmeter array is disposed upstream of the second flowmeter array along a flow direction of the liquid flow.
Further, the first flowmeter array includes a first downstream transducer and a first upstream transducer, the first downstream transducer is located above the first upstream transducer, the first upstream transducer is located downstream of the first downstream transducer, the second flowmeter array includes a second downstream transducer and a second upstream transducer, the second downstream transducer is located below the second upstream transducer, and the second upstream transducer is located upstream of the second downstream transducer.
Further, the first counter-current transducer is located upstream of the second forward-current transducer in the flow direction of the liquid stream.
Further, if the first detected flow value is greater than the first preset flow value and less than the second preset flow value, the sampling frequency is a first frequency, and if the first detected flow value is greater than the second preset flow value, the sampling frequency is a second frequency, and the first frequency is greater than the second frequency.
Further, if the first detected flow value is greater than the first preset flow value and less than the second preset flow value, acquiring a plurality of flow calibration values at the first frequency, determining a first average flow calibration value by an average value of the plurality of flow calibration values, and determining a first calibration target value by a product of the first average flow calibration value and a first calibration factor;
and if the first detection flow value is larger than the second preset flow value, acquiring a plurality of flow calibration values at the second frequency, determining a second average flow calibration value by the average value of the flow calibration values, and determining a second calibration target value by the product of the second average flow calibration value and a second calibration factor.
Further, the determining a flow output value based on the first detected flow value and the flow calibration value comprises: and taking the average value of the sum of the first detection flow value and the first calibration target value as a flow output value, or taking the average value of the sum of the first detection flow value and the second calibration target value as a flow output value.
Further, the first calibration factor ranges from 0.7 to 1 and the second calibration factor ranges from 0.3 to 0.6.
Compared with the related art, the flow detection method for the ultrasonic flowmeter has the beneficial effects that: the detection method can improve the flow detection precision of the liquid flow when the liquid flow is not filled in the pipeline to flow, and calibrate and adjust the detection value by adopting different calibration forces under different flow values, thereby improving the flow calibration detection efficiency and accuracy.
Drawings
FIG. 1 is a schematic diagram of a flow detection method for an ultrasonic flow meter in an embodiment of the invention;
FIG. 2 is a schematic layout of a first flowmeter array and a second flowmeter array according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Referring to fig. 1-2, the present invention provides a flow detection method for an ultrasonic flowmeter, which includes: the first detection flow value is determined by the first flow meter group 10 detection. The first flowmeter array 10 and the second flowmeter array 20 are each an ultrasonic flowmeter, wherein the ultrasonic flowmeter generally includes two transducers, one being a forward flow transducer and the other being a reverse flow transducer. The two transducers are typically mounted at different locations along the conduit, each in the direction of fluid flow. One of the transducers generates an ultrasonic pulse that is transmitted into the fluid and propagates at a particular frequency. The other transducer receives the ultrasonic pulse signal sent by the opposite transducer, the ultrasonic pulse is propagated by the fluid, the speed and the flow rate of the fluid have an influence on the propagation speed of the ultrasonic wave, and the flowmeter can calculate the speed of the fluid by measuring the time difference between the ultrasonic pulses transmitted to the receiving transducer. This time difference is commonly referred to as the "doppler shift".
The first flowmeter array 10 is disposed upstream of the second flowmeter array 20 in the flow direction of the liquid flow within the pipe. Specifically, the first flowmeter array 10 includes a first downstream transducer 11 and a first upstream transducer 12, the first downstream transducer 11 being located above the first upstream transducer 12, and the first upstream transducer 12 being located downstream of the first downstream transducer 11 in the flow direction of the liquid flow.
The second flowmeter array 20 includes a second downstream transducer 22 and a second upstream transducer 21, the second downstream transducer 22 being located below the second upstream transducer 21, the second upstream transducer 21 being located upstream of the second downstream transducer 22 in the flow direction of the liquid flow.
Along the flow direction of the liquid stream, the first counter-current transducer 12 is located upstream of the second forward-current transducer 22. The first flowmeter array 10 and the second flowmeter array 20 thus disposed may jointly include two downstream transducers and two upstream transducers, and the two downstream transducers and the two upstream transducers are disposed opposite each other at an upper portion or a lower portion of the pipe, respectively, so that when the liquid flow is not filled in the pipe, the ultrasonic waves emitted by the first downstream transducer 11 are sent to the first upstream transducer 12 after passing through the air medium under downstream, and the ultrasonic waves emitted by the second downstream transducer 22 are sent to the second upstream transducer 21 after passing through the liquid medium under downstream. Therefore, the flow values measured for a plurality of times can be calibrated by sequentially carrying out the sequence of different media through which the ultrasonic waves flow, so that the detection precision is improved.
Specifically, a liquid level sensor is arranged in a pipeline for conveying liquid flow, the liquid level sensor detects the liquid level of the liquid flow in the pipeline and determines a liquid level height value, when the liquid level height value is smaller than a preset height value, the second flowmeter group 20 is controlled to start to operate, and otherwise, the second flowmeter group 20 is controlled to stop operating. When the liquid level height value is smaller than the preset height value, the liquid flow in the current pipeline can be represented to be unfilled or full of the whole pipeline, and the second flowmeter group 20 is controlled to start to operate according to the current conveying state, so that accurate detection of the flow value can be realized.
And judging the magnitude relation between the first detection flow value and the first preset flow value and the second preset flow value, wherein the first preset flow value is smaller than the second preset flow value, the first preset flow value and the second preset flow value are preset values, and determining a calibration mode and a calibration force through the first detection flow value, the first preset flow value and the second preset flow value. The first preset flow value is an average value of a plurality of initial flow detection values detected in an initial detection period by using the first flow meter group 10, and is used as an evaluation basis for evaluating the subsequent delivery state of the flow in the pipeline. The second preset flow value is greater than the first preset flow value, specifically, the second preset flow value is 130% or 150% of the first preset flow value.
And if the first detection flow value is smaller than or equal to the first preset flow value, taking the first detection flow value as a flow output value. When the first detected flow value is smaller than or equal to a first preset flow value, the flow speed of the current liquid flow is characterized to be lower and more stable, the detected value of the second flowmeter set is not required to be calibrated, and the first detected flow value detected by the first flowmeter set is directly used as a flow output value.
If the first detected flow value is greater than the first preset flow value, acquiring flow calibration values detected by the second ultrasonic flowmeter group at different sampling frequencies in the sampling period with the same duration, and determining a flow output value based on the first detected flow value and the flow calibration values.
Specifically, if the first detected flow value is greater than the first preset flow value and less than the second preset flow value, the sampling frequency is a first frequency, and if the first detected flow value is greater than the second preset flow value, the sampling frequency is a second frequency, and the first frequency is greater than the second frequency. For example, the sampling period with the same duration may be set to 60s or 90s, the first frequency is 10, and the second frequency is 5, which is not particularly limited herein.
When the first detected flow value is between the first preset flow value and the second preset flow value, a plurality of flow calibration values are acquired in the sampling period with the same duration at a higher first frequency. At this point the flow may flow in the pipe at a medium speed, requiring a higher acquisition frequency to obtain a flow calibration value for calibrating the first detected flow value, so that its calibration is more stable and balanced when flowing at a medium speed.
If the first detected flow value is greater than the first preset flow value and less than the second preset flow value, a plurality of flow calibration values are obtained at a first frequency, a first average flow calibration value is determined by the average value of the plurality of flow calibration values, a first calibration target value is determined by the product of the first average flow calibration value and a first calibration factor, and then the average value of the plurality of flow calibration values obtained at the first frequency in the sampling period with the same duration is determined as the first calibration target value, so that the sampling stability of the flow calibration values is improved, and the accuracy in calibration is improved.
If the first detected flow value is greater than a second preset flow value, a plurality of flow calibration values are acquired at a second frequency, a second average flow calibration value is determined by the average value of the plurality of flow calibration values, a second calibration target value is determined by the product of the second average flow calibration value and a second calibration factor, and then the average value of the plurality of flow calibration values acquired at the second frequency in the sampling period with the same duration is determined as the second calibration target value, so that the sampling stability of the flow calibration values is improved, and the accuracy in calibration is improved.
Specifically, the first calibration factor ranges from 0.7 to 1 and the second calibration factor ranges from 0.3 to 0.6. The first calibration factor is set to be higher than the second calibration factor, so that when the flow calibration value is acquired at the first frequency, the flow velocity of the liquid flow in the pipeline is smaller than the flow velocity when the flow calibration value is acquired at the second frequency, and therefore, a higher calibration force is needed to calibrate and compensate the first flow detection value, and when the first detection flow value is larger, namely higher than the second preset flow value, the flow velocity of the liquid flow is larger in the same pipeline size, so that higher compensation is not needed, when the flow velocity is lower, the stability of the liquid flow is low, the flow performance in the pipeline can have a larger influence, and therefore, the first average flow calibration value needs to be adjusted by the higher first calibration factor.
Determining a flow output value based on the first detected flow value and the flow calibration value comprises: taking the average value of the first detection flow value and the first calibration target value as a flow output value, or taking the average value of the first detection flow value and the second calibration target value as a flow output value, namely taking the average value of the sum of the first detection flow value and the first calibration target value as a flow output value, or taking the average value of the sum of the first detection flow value and the second calibration target value as a flow value, and carrying out calibration balance on the actually detected first detection flow value or second detection flow value and the calibration target value again by the average value.
And the first detection flow value is subjected to graded differentiation calibration under different liquid flow velocity states through the determined first calibration target value or the second calibration target value, so that the overall flow detection accuracy of the ultrasonic wave can be improved through the calibration and the calibration of a plurality of flow values.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A flow rate detection method for an ultrasonic flow meter, comprising:
Determining a first detected flow value by the first flowmeter array detection;
judging the magnitude relation between the first detection flow value and a first preset flow value and a second preset flow value, wherein the first preset flow value is smaller than the second preset flow value, and the first preset flow value and the second preset flow value are preset values;
If the first detected flow value is smaller than or equal to the first preset flow value, the first detected flow value is used as a flow output value;
And if the first detection flow value is larger than the first preset flow value, acquiring flow calibration values detected by a second flow meter group in different sampling frequencies in the sampling period with the same duration, and determining a flow output value based on the first detection flow value and the flow calibration values.
2. The flow rate detection method for an ultrasonic flow meter according to claim 1, wherein the first flow meter group is disposed upstream of the second flow meter group along a flow direction of the liquid flow.
3. The flow detection method for an ultrasonic flow meter according to claim 2, wherein the first flow meter group includes a first downstream transducer and a first upstream transducer, the first downstream transducer being located above the first upstream transducer, the second flow meter group includes a second downstream transducer and a second upstream transducer, the second downstream transducer being located below the second upstream transducer, the second upstream transducer being located upstream of the second downstream transducer.
4. A flow sensing method for an ultrasonic flow meter as claimed in claim 3, wherein said first counter-current transducer is located upstream of said second downstream transducer along the flow direction of the liquid flow.
5. The flow rate detection method according to claim 1, wherein the sampling frequency is a first frequency if the first detection flow rate value is greater than the first preset flow rate value and less than the second preset flow rate value, and is a second frequency if the first detection flow rate value is greater than the second preset flow rate value, and the first frequency is greater than the second frequency.
6. The flow rate detection method for an ultrasonic flow meter according to claim 5, wherein,
If the first detected flow value is greater than the first preset flow value and less than the second preset flow value, acquiring a plurality of flow calibration values at the first frequency, determining a first average flow calibration value by an average value of the flow calibration values, and determining a first calibration target value by a product of the first average flow calibration value and a first calibration factor;
and if the first detection flow value is larger than the second preset flow value, acquiring a plurality of flow calibration values at the second frequency, determining a second average flow calibration value by the average value of the flow calibration values, and determining a second calibration target value by the product of the second average flow calibration value and a second calibration factor.
7. The flow detection method for an ultrasonic flow meter of claim 6, wherein the determining a flow output value based on the first detected flow value and the flow calibration value comprises:
And taking the average value of the sum of the first detection flow value and the first calibration target value as a flow output value, or taking the average value of the sum of the first detection flow value and the second calibration target value as a flow output value.
8. The flow detection method for an ultrasonic flow meter of claim 6, wherein the first calibration factor ranges from 0.7 to 1 and the second calibration factor ranges from 0.3 to 0.6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410031182.2A CN118089891A (en) | 2024-01-09 | 2024-01-09 | Flow detection method for ultrasonic flowmeter |
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| CN202410031182.2A CN118089891A (en) | 2024-01-09 | 2024-01-09 | Flow detection method for ultrasonic flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119023038A (en) * | 2024-08-21 | 2024-11-26 | 西尼尔(南京)过程控制有限公司 | A method for measuring and analyzing fluid using an electromagnetic flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119023038A (en) * | 2024-08-21 | 2024-11-26 | 西尼尔(南京)过程控制有限公司 | A method for measuring and analyzing fluid using an electromagnetic flowmeter |
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