CN116858346A - Calibration method and calibration device based on ultrasonic flowmeter - Google Patents
Calibration method and calibration device based on ultrasonic flowmeter Download PDFInfo
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- CN116858346A CN116858346A CN202311133790.6A CN202311133790A CN116858346A CN 116858346 A CN116858346 A CN 116858346A CN 202311133790 A CN202311133790 A CN 202311133790A CN 116858346 A CN116858346 A CN 116858346A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 62
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 18
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- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
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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
Abstract
The application discloses a calibration method and a calibration device based on an ultrasonic flowmeter. The calibrating method based on the ultrasonic flowmeter comprises the following steps: step 1: presetting a pulse volume and a standard flow rate; step 2: placing the flowmeter on a calibration platform, and introducing test gas into the flowmeter by the calibration platform at a standard flow rate; step 3: the flowmeter obtains the measured flow measured in the minimum sampling period, and then calculates the multiple of the measured flow and the pulse volume to obtain the pulse number; step 4: the signal generator sends pulse signals with the pulse number to the calibration platform, and the calibration platform calibrates the flowmeter according to the pulse number. The application has the beneficial effects that the calibration method and the calibration device based on the ultrasonic flowmeter can accurately calibrate the ultrasonic flowmeter under the condition of meeting the original mechanical flowmeter calibration table.
Description
Technical Field
The application relates to the field of ultrasonic flow calibration, in particular to a calibration method and a calibration device based on an ultrasonic flowmeter.
Background
In the calibration of ultrasonic flow meters, a calibration stage is required, and current calibration stages receive the pulse signals generated by the flow meter to record the volume of gas passing through the flow meter. In mechanical flowmeters, such as turbines and roots, a plurality of magnetic steels are uniformly arranged on an internal mechanical valve core, so that pulse signals are uniformly generated along with the rotation of the mechanical core, and the period of the pulse signals reflects the rotation rate of the mechanical core, thereby completing the measurement of the flowmeter.
Therefore, in the calibration of the mechanical flowmeter, only the pulse signals generated by the mechanical valve core in the rotation process are sent to the calibration table, so that the calibration of the flowmeter can be completed.
However, when such calibration stand is used for calibrating an ultrasonic flowmeter, the ultrasonic flowmeter is required to periodically generate pulses representing the flow rate and send the pulses to the calibration stand; the pulses are generated by the ultrasonic flowmeter itself, so in the existing scheme, the flow in the period is calculated at a certain period, such as 2 seconds, after the period is finished, then the number of pulses required to be generated in the period is calculated according to the flow, and then the corresponding pulses are generated and sent to the calibration table. Under such schemes, the generated pulse signal is not uniform, but it is necessary to wait at least one period of time and then transmit a train of pulse signals.
Therefore, it is very difficult for the calibration platform to obtain the instantaneous flow of the ultrasonic flowmeter according to the intervals of the pulse signals, which results in too low measurement accuracy of the calibration platform, and since no pulse exists in the time interval from the end of one period to the expiration of the next period after the pulse of the period is intensively transmitted, the calibration platform considers that the calibration is finished and the calibration cannot be completed.
In summary, because the current calibration tables are matched with the calibration of the traditional mechanical flowmeter, the precision is too low when the calibration tables are applied to the calibration of the ultrasonic flowmeter; and from new design of a new calibration platform, the calibration cost of the ultrasonic flowmeter is increased.
Disclosure of Invention
The summary of the application is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary of the application is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
As a first aspect of the present application, in order to solve the technical problem that the calibration stand of the existing mechanical flowmeter cannot be adapted to the calibration of the ultrasonic flowmeter, some embodiments of the present application provide a calibration method based on the ultrasonic flowmeter, which includes the following steps:
step 1: presetting a pulse volume and a standard flow rate;
step 2: placing the flowmeter on a calibration platform, and introducing test gas into the flowmeter by the calibration platform at a standard flow rate;
step 3: determining the minimum sampling period of the flowmeter, acquiring the measured flow measured in the minimum sampling period by the flowmeter, and then calculating the multiple of the measured flow and the pulse volume to obtain the pulse number;
step 4: the signal generator sends pulse signals with the pulse number to the calibration platform, and the calibration platform calibrates the flowmeter according to the pulse number.
The measuring principle of the ultrasonic flowmeter determines that the ultrasonic flowmeter has a minimum sampling period, then the number of pulse signals required to be sent by the signal generator is calculated according to the flow measured in the minimum sampling period, and then the signal generator sends corresponding pulse signals. The number of pulse signals received by the calibration platform is closely related to the minimum sampling period of the ultrasonic flow, and under the method, the calibration platform can obtain the measurement result of the flowmeter according to the number of pulse signals received, so that the measurement error condition of the flowmeter is obtained according to the gas flow which is introduced into the ultrasonic flowmeter by the calibration platform. Therefore, the method provided by the application can enable the calibration table originally used for calibrating the mechanical flow valve to be used for calibrating the ultrasonic flowmeter by only using one signal generator under the condition that the original calibration table is not required to be changed. Therefore, the calibration platform has good precision in calibrating the mechanical flow valve and the ultrasonic flow valve without modifying the calibration platform in a large scale.
The accuracy of the instantaneous flow measurement is a very important indicator for a flowmeter, so that the performance of the instantaneous flow measurement of the flowmeter needs to be improved as much as possible during the calibration of the flowmeter. Aiming at the problem, the application provides the following technical scheme:
further: in step 1, the pulse volume is less than the volume of gas that the meter passes in the smallest sampling period at the standard flow rate.
The technical scheme provided by the application is as follows: at least one pulse message is generated in each sampling period, so that the interval between pulse signals is smaller than the interval of the minimum sampling period, and at least in each sampling period of the flowmeter, the adaptive data are used for calculating the instantaneous flow, so that under the density of the pulse data, the performance of measuring the instantaneous flow of the flowmeter can be improved after the accuracy of calibration is increased.
In national regulations, spot check operations for the accuracy of a flow meter typically cover the entire range of the flow meter. Generally, 25 check points are arranged in the whole measuring range of the flowmeter, and the accuracy of the 25 point measurements is detected; thus, after calibrating the flowmeter, the flowmeter needs to have enough precision in the whole measuring range. Aiming at the problem, the application provides the following technical scheme:
further, the step 1 specifically includes the following steps:
step 11: the calibration table presets a plurality of standard flow rates;
step 12: the calibration stage calculates a pulse volume from the sampling period of the flow meter and the minimum standard flow rate, the pulse volume being less than the volume of gas that the flow meter passes through in the minimum sampling period at the minimum standard flow rate.
In the scheme, step 11 sets a plurality of standard flow rates in advance, so that the number of the standard flow rates can be set according to the requirements so as to meet the measurement requirements under different flow rates; therefore, the standard flow rate can be set in each range of the measuring range of the flowmeter, so that the flowmeter is calibrated in the whole measuring range;
in step 12, the set pulse volume is smaller than the volume of the gas passing through in the minimum sampling period, so that a pulse signal is generated in each sampling period of the flowmeter in the process of calibrating the flowmeter, and further, a data is provided for the flow measurement result of each sampling period for calibrating, and the calibrating precision is ensured.
So, in this scheme, when designing standard velocity of flow and pulse volume, on the basis of having guaranteed that the scale range can cover whole flowmeter's range as far as possible, still guaranteed the precision of demarcating at every turn, guaranteed so that the flowmeter has sufficient precision in whole measuring range.
Further, the step 3 specifically includes the following steps:
step 31: the flowmeter records the measured flow V obtained by measuring and calculating in each sampling period in real time.
Step 32: the flowmeter calculates the multiple of the measured flow V and the pulse volume to obtain the pulse number, and accumulates the remainder obtained by calculation into the flow calculation of the next sampling period.
The step 4 specifically comprises the following steps:
step 41: the flowmeter sends the pulse number to the signal generator;
step 42: the signal generator generates pulse signals with the same number as the pulses and sends the pulse signals to the calibration table;
step 43: the calibration platform calibrates the flowmeter according to the pulse signals.
As a second aspect of the present application, for the technical problem that the ultrasonic flowmeter cannot be accurately calibrated by the step-level mechanical calibration stage: some embodiments of the application provide a calibration device based on an ultrasonic flowmeter, which comprises a calibration table and a signal generator, wherein the signal generator is connected with the calibration table in a signal way, and the signal generator is connected with the flowmeter to be calibrated in a signal way;
the calibration table presets pulse volume and standard flow rate;
the calibration platform is used for introducing test gas into the flowmeter at a standard flow rate, the flowmeter acquires the measured flow measured in the minimum sampling period, then the multiple of the measured flow and the pulse volume is calculated to obtain the pulse number, the pulse number is sent to the signal generator, and the signal generator sends pulse signals of the pulse number to the calibration platform.
Further, the calibration stage calculates a pulse volume based on the sampling period of the flow meter and the minimum standard flow rate, the pulse volume being less than the volume of gas that the flow meter passes through during the minimum sampling period at the minimum standard flow rate.
Further, the flowmeter records the measured flow V obtained by measuring and calculating in each sampling period in real time;
the flowmeter calculates the multiple of the measured flow V and the pulse volume to obtain the pulse number, and accumulates the remainder obtained by calculation into the flow calculation of the next sampling period.
Further, the method comprises the steps of,
the flowmeter sends the pulse number to the signal generator;
the signal generator generates pulse signals with the same number as the pulses and sends the pulse signals to the calibration table;
the calibration platform calibrates the flowmeter according to the pulse signals.
As a second aspect of the present application, some embodiments of the present application provide an ultrasonic flowmeter-based calibration apparatus, including a calibration stage and a signal generator, the signal generator being in signal connection with the calibration stage, the signal generator being in signal connection with a flowmeter to be calibrated;
the calibration table presets pulse volume and standard flow rate;
the calibration platform is used for introducing test gas into the flowmeter at a standard flow rate, the flowmeter acquires the measured flow measured in the minimum sampling period, then the multiple of the measured flow and the pulse volume is calculated to obtain the pulse number, the pulse number is sent to the signal generator, and the signal generator sends pulse signals of the pulse number to the calibration platform.
In the scheme, the pulse number is calculated by measuring the flow in the minimum sampling period of the ultrasonic flowmeter, then corresponding pulse signals are generated, and the pulse signals are sent to the calibration table. Therefore, under the scheme, the method can simulate that the pulse signals of the same emission logic as the mechanical flow valve, namely, the intervals of the pulse signals are related to the flow rate measured by the ultrasonic flowmeter, if the flow rate measured is high, more pulse signals are generated in a sampling period, and if the flow rate measured is low, less pulse signals are generated in the sampling period, so that the measuring rate of the ultrasonic flow valve can be reflected, and the calibration table can perform more accurate calibration.
Further, the calibration stage calculates a pulse volume according to the sampling period of the flowmeter and the minimum standard flow rate, wherein the pulse volume is smaller than the gas volume which the flowmeter passes through in the minimum sampling period at the minimum standard flow rate.
Further, the flowmeter records the measured flow V obtained by measuring and calculating in each sampling period in real time;
the flowmeter calculates the multiple of the measured flow V and the pulse volume to obtain the pulse number, and accumulates the remainder obtained by calculation into the flow calculation of the next sampling period.
Further, the flowmeter sends the pulse number to the signal generator;
the signal generator generates pulse signals with the same number as the pulses and sends the pulse signals to the calibration table;
the calibration platform calibrates the flowmeter according to the pulse signals.
In summary, the application provides a calibration method and a calibration device based on an ultrasonic flowmeter, which can enable an original mechanical calibration platform to have good calibration precision when being used for the calibration of the ultrasonic flowmeter.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application.
In addition, the same or similar reference numerals denote the same or similar elements throughout the drawings. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.
In the drawings:
FIG. 1 is a flow chart of a method of calibration based on an ultrasonic flow meter;
FIG. 2 is a flow chart of a preset pulse volume and standard flow rate;
FIG. 3 is a flow chart for counting pulses;
FIG. 4 is a flow chart of the calibration station calibrating the flowmeter according to the number of pulses;
fig. 5 is a schematic structural view of a calibration device based on an ultrasonic flowmeter.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.
It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings. Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.
The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1: referring to fig. 1, a calibration method based on an ultrasonic flowmeter includes the steps of:
step 1: presetting a pulse volume and a standard flow rate;
step 2: placing the flowmeter on a calibration platform, and introducing test gas into the flowmeter by the calibration platform at a standard flow rate;
step 3: determining the minimum sampling period of the flowmeter, acquiring the measured flow measured in the minimum sampling period by the flowmeter, and then calculating the multiple of the measured flow and the pulse volume to obtain the pulse number;
step 4: the signal generator sends pulse signals with the pulse number to the calibration platform, and the calibration platform calibrates the flowmeter according to the pulse number.
The measurement principle of an ultrasonic flowmeter determines that it has a minimum sampling period, and in general, an electronic ultrasonic flowmeter measures one side at a certain interval, for example, once in 125ms, so that it detects twice in 2 s. Each ultrasonic flow meter must have a minimum measurement period. And then according to the flow obtained by measurement in the minimum sampling period, calculating the number of pulse signals required to be sent by the signal generator, and then sending corresponding pulse signals by the signal generator. The number of pulse signals received by the calibration platform is closely related to the minimum sampling period of the ultrasonic flow, and under the method, the calibration platform can obtain the measurement result of the flowmeter according to the number of pulse signals received, so that the measurement error condition of the flowmeter is obtained according to the gas flow which is introduced into the ultrasonic flowmeter by the calibration platform. Therefore, the method provided by the application can enable the calibration table originally used for calibrating the mechanical flow valve to be used for calibrating the ultrasonic flowmeter by only using one signal generator under the condition that the original calibration table is not required to be changed. Therefore, under the condition that the calibration platform is not modified in a large scale, the calibration platform has good precision no matter the calibration platform is used for calibrating the mechanical flow valve or the ultrasonic flow valve. Thus, the pulse generated by the application can be self-adaptive to the flow rate of the fluid during measurement, if the flow rate of the fluid is high, a high-speed uniform pulse train is generated, and if the flow rate of the fluid is low, a low-speed uniform pulse train is generated.
Accordingly, the minimum sampling period is a characteristic of the ultrasonic flowmeter, and naturally, the minimum sampling period of the ultrasonic flowmeter can be obtained or determined during measurement.
Further: in step 1, the pulse volume is less than the volume of gas that the meter passes in the smallest sampling period at the standard flow rate.
In step 1, the pulse volume is set in relation to the standard flow rate, the minimum sampling period of the flowmeter. Therefore, the volume of the gas introduced into the flowmeter is larger than the pulse volume at the standard flow rate, so that at least one pulse signal is ensured in a minimum sampling period, the continuity of the pulse signal is ensured, and the accuracy of measurement is improved.
Referring to fig. 2, further, step 1 specifically includes the following steps:
step 11: the calibration stand presets a plurality of standard flow rates.
In step 11, the number of standard flow rates preset by the calibration stage is not limited, and the number of standard flow rates is required for the items to be tested, for example, some flow meters have high requirements, and measurement accuracy under various flow rates is required to be tested, so that a plurality of standard flow rates are required to be configured correspondingly.
Step 12: the calibration platform calculates the pulse volume according to the sampling period of the flowmeter and the minimum standard flow rate, wherein the pulse volume is smaller than the gas volume passing through the flowmeter in the minimum sampling period under the minimum standard flow rate;
in step 12, the minimum standard flow rate is the minimum flow rate among a plurality of preset standard flow rates. The minimum standard flow rate is adopted to determine the pulse volume, so that pulse signals can be generated in a sampling period under the test of any flow rate.
Referring to fig. 3, step 3 specifically includes the steps of:
step 31: the flowmeter records the measured flow V obtained by measuring and calculating in each sampling period in real time.
Step 32: the flowmeter calculates the multiple of the measured flow V and the pulse volume to obtain the pulse number, and accumulates the remainder obtained by calculation into the flow calculation of the next sampling period.
Referring to fig. 4, step 4 specifically includes the steps of:
step 41: the flowmeter sends the pulse number to the signal generator;
step 42: the signal generator generates pulse signals with the same number as the pulses and sends the pulse signals to the calibration table;
step 43: the calibration platform calibrates the flowmeter according to the pulse signals.
Referring to fig. 5, example 2: in order to realize the calibration method based on the ultrasonic flowmeter, the application provides a calibration device based on the ultrasonic flowmeter, which comprises a calibration table and a signal generator, wherein the signal generator is connected with the calibration table in a signal way, and the signal generator is connected with the flowmeter to be calibrated in a signal way.
The calibration platform is the original calibration platform of the mechanical flowmeter, and the signal generator is a PWN pulse emitter.
The calibration table presets pulse volume and standard flow rate;
the calibration platform is used for introducing test gas into the flowmeter at a standard flow rate, the flowmeter is used for obtaining the measured flow rate measured in the minimum sampling period, then the multiple of the measured flow rate and the pulse volume is calculated to obtain the pulse number and the pulse number is sent to the signal generator, and the signal generator is used for sending pulse signals of the pulse number to the calibration platform. The calibration platform calculates a pulse volume according to the sampling period of the flowmeter and the minimum standard flow rate, wherein the pulse volume is smaller than the gas volume passing through the flowmeter in the minimum sampling period under the minimum standard flow rate. The flowmeter records the measured flow V obtained by measuring and calculating in each sampling period in real time; the flowmeter calculates the multiple of the measured flow V and the pulse volume to obtain the pulse number, and accumulates the remainder obtained by calculation into the flow calculation of the next sampling period. The flowmeter sends the pulse number to the signal generator; the signal generator generates pulse signals with the same number as the pulses and sends the pulse signals to the calibration table; the calibration platform calibrates the flowmeter according to the pulse signals.
The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by those skilled in the art that the scope of the application in the embodiments of the present disclosure is not limited to the specific combination of the above technical features, but encompasses other technical features formed by any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-described features, are mutually substituted with (but not limited to) the features having similar functions disclosed in the embodiments of the present disclosure.
Claims (9)
1. A method of calibrating an ultrasonic flow meter comprising the steps of:
step 1: presetting a pulse volume and a standard flow rate;
step 2: placing the flowmeter on a calibration platform, and introducing test gas into the flowmeter by the calibration platform at a standard flow rate;
step 3: determining the minimum sampling period of the flowmeter, acquiring the measured flow measured in the minimum sampling period by the flowmeter, and then calculating the multiple of the measured flow and the pulse volume to obtain the pulse number;
step 4: the signal generator sends pulse signals with the pulse number to the calibration platform, and the calibration platform calibrates the flowmeter according to the pulse number.
2. The ultrasonic flow meter-based calibration method of claim 1, wherein: in step 1, the pulse volume is less than the volume of gas that the meter passes in the smallest sampling period at the standard flow rate.
3. The ultrasonic flow meter-based calibration method of claim 2, wherein: the step 1 specifically comprises the following steps:
step 11: the calibration table presets a plurality of standard flow rates;
step 12: the calibration stage calculates a pulse volume from the sampling period of the flow meter and the minimum standard flow rate, the pulse volume being less than the volume of gas that the flow meter passes through in the minimum sampling period at the minimum standard flow rate.
4. The ultrasonic flow meter-based calibration method of claim 3, wherein: the step 3 specifically comprises the following steps:
step 31: the flowmeter records the measured flow V obtained by measuring and calculating in each sampling period in real time;
step 32: the flowmeter calculates the multiple of the measured flow V and the pulse volume to obtain the pulse number, and accumulates the remainder obtained by calculation into the flow calculation of the next sampling period.
5. The ultrasonic flow meter-based calibration method of claim 3, wherein: the step 4 specifically comprises the following steps:
step 41: the flowmeter sends the pulse number to the signal generator;
step 42: the signal generator generates pulse signals with the same number as the pulses and sends the pulse signals to the calibration table;
step 43: the calibration platform calibrates the flowmeter according to the pulse signals.
6. A calibrating device based on ultrasonic flowmeter, its characterized in that: the device comprises a calibration table and a signal generator, wherein the signal generator is in signal connection with the calibration table and is in signal connection with a flowmeter to be calibrated;
the calibration table presets pulse volume and standard flow rate;
the calibration platform is used for introducing test gas into the flowmeter at a standard flow rate, the flowmeter acquires the measured flow measured in the minimum sampling period, then the multiple of the measured flow and the pulse volume is calculated to obtain the pulse number, the pulse number is sent to the signal generator, and the signal generator sends pulse signals of the pulse number to the calibration platform.
7. The ultrasonic flow meter calibration apparatus of claim 6, wherein: the calibration stage calculates a pulse volume from the sampling period of the flow meter and the minimum standard flow rate, the pulse volume being less than the volume of gas that the flow meter passes through in the minimum sampling period at the minimum standard flow rate.
8. The ultrasonic flow meter calibration apparatus of claim 6, wherein: the flowmeter records the measured flow V obtained by measuring and calculating in each sampling period in real time;
the flowmeter calculates the multiple of the measured flow V and the pulse volume to obtain the pulse number, and accumulates the remainder obtained by calculation into the flow calculation of the next sampling period.
9. The ultrasonic flow meter calibration apparatus of claim 6, wherein:
the flowmeter sends the pulse number to the signal generator;
the signal generator generates pulse signals with the same number as the pulses and sends the pulse signals to the calibration table;
the calibration platform calibrates the flowmeter according to the pulse signals.
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