CN109029644B - Online monitoring method for metering performance of membrane type gas meter - Google Patents
Online monitoring method for metering performance of membrane type gas meter Download PDFInfo
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Abstract
The invention discloses an online monitoring method for the metering performance of a membrane type gas meter, which comprises the specific working steps and the analysis steps of the gas meter and a gas transmission end pressure sensor, wherein the gas transmission end of the gas meter is fixedly provided with the pressure sensor, and the specific working steps comprise the following steps: according to the internal structure and the principle of the diaphragm gas meter, when pressure fluctuation in a period is ignored, stable pulsation phenomenon exists in gas transmission airflow, and the diaphragm gas meter relates to the technical field of gas metering monitoring. The online monitoring method for the metering performance of the membrane type gas meter can realize online monitoring of the metering performance of the membrane type gas meter, achieves the aim of dynamically monitoring the metering performance and equipment performance of the membrane type gas meter, and indirectly realizes centralized reading and intellectualization of the membrane type gas meter through monitoring and analyzing pipeline pressure fluctuation, thereby having great significance for modification of stored meters.
Description
Technical Field
The invention relates to the technical field of gas metering monitoring, in particular to an online monitoring method for metering performance of a membrane type gas meter.
Background
At present, two gas meters are mainstream in the market, and one gas meter is a traditional mechanical diaphragm gas meter; the other type is a prepayment membrane gas meter, the metering of the mechanical membrane gas meter is realized by a mechanical roller, the mechanical roller performs adding operation according to the used gas amount, each unit amount is used, the roller counts and adds one, and finally the gas amount metering record is realized, the mechanical gas meter has the advantages of reliable metering and stable quality, and the defects of troublesome meter reading and manual door-to-door meter reading are overcome, a gas company needs to invest a lot of financial and manpower, when flowing gas passes through the gas meter, the flowing gas is rubbed by a pipeline and blocked by a mechanism, the internal gas can generate pressure difference at the two ends of the inlet and the outlet of the gas meter, the diaphragm of the membrane gas meter is pushed to move in the metering chamber by the pressure difference, and the gas distribution mechanism is driven to perform coordinated gas distribution, so that the movement of the diaphragm can be performed in a continuous reciprocating manner, then the mechanical roller counter is driven to rotate through circular motion; the diaphragm gas meter is invented since 160 years ago, and is still used as mainstream gas metering equipment with the flow rate of below 100 cubic meters; the mechanical structure, long service life, economy and practicality are the main characteristics of the device, and the device has obvious defects, such as no temperature and pressure compensation, low metering precision, low intelligence level, easy gas stealing, incapability of carrying out online monitoring on metering performance and the like.
Aiming at the problems at present, a series of innovations are carried out, the problem of online monitoring of the metering performance is successfully solved, online monitoring of the metering performance of the membrane gas meter is achieved, the purpose of online dynamic monitoring of the metering performance and the equipment performance of the membrane gas meter is achieved, meanwhile, centralized reading and intelligentization of the membrane gas meter are indirectly achieved through monitoring and analyzing of pipeline pressure fluctuation, and the method has great significance for modification of stock meters and online monitoring of industrial and commercial gas meters.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an online monitoring method for the metering performance of a membrane type gas meter, which solves the problems that online monitoring of the metering performance of the membrane type gas meter cannot be realized, and the dynamic monitoring of the metering performance and the equipment performance of the membrane type gas meter cannot be realized.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the on-line monitoring method of the metering performance of the membrane type gas meter comprises the steps of the gas meter, a pressure sensor, a specific working step and an analysis step, wherein the pressure sensor is fixedly installed on one side of a gas transmission end of the gas meter, and the pressure sensor is used for measuring the pressure fluctuation of the gas transmission end of the gas meter, and the specific working step comprises the following steps:
a1according to the internal structure and the principle of the diaphragm gas meter, when pressure fluctuation in a period is ignored, stable pulsation phenomenon exists in gas conveying airflow, a pressure sensor is used for sampling, the waveform of the pressure fluctuation is analyzed, two peak values and two secondary peak values are arranged in each period, the two secondary peak values are located between the two peak values, the sizes of the peak values and the secondary peak values are related to pressure difference and are related to connected pipelines and equipment, but the distribution of the peak values is displayedStable regularity is obtained, and a oscillogram is obtained by filtering pipe network fluctuation and performing filtering algorithms such as smoothing and mean values;
a2let the period be T and the time interval from the first peak to the first secondary peak be T1The time interval to the second secondary peak is t2The time interval to the second peak is t3The time interval between two sub-peaks is t4The time interval between the second secondary peak and the second peak is t5Establishing a mathematical model diagram;
a3for a particular diaphragm gas meter,
the three ratios are all fixed and can be set
The method comprises the steps that the characteristic values belong to equipment, the three characteristic values are calibrated and written in when the membrane type gas meter leaves a factory and are recorded as a first group, pressure waveforms can be extracted at any time in the later operation process, the measurement performance deviation and the equipment fault problem can be found in time through filtering, pipe network fluctuation removal, peak value finding, ratio calculation and comparison ratio, and the measurement error can be further judged, so that the quantitative analysis of the measurement error of the gas meter can be realized, the number of cycles can be further screened and counted, and the centralized reading and charging of the gas meter can be realized;
a4in addition to the above three parameters, the device needs to write in at the beginning
As a second set, the ratio of the two characteristics can be set
The analyzing step comprises the steps of:
b1if no and a can be found3When the first set of characteristic values are matched with the ratio relationship, the ratio relationship may be caused by excessive measurement error of the meter or occurrence of the meterA barrier;
b2, if the gas meter has internal leakage, the external force influence occurs, the mechanical fault occurs, the metering performance is influenced, and according to the internal structure of the gas meter, the t is hardly influenced1、t4、t5Three values exert equal influence, and t can be respectively assumed1′、t4′、t5' for real measurements, three periods can be calculated:
the three period values are compared with t3Comparing the original writing characteristic period, wherein the period value with the maximum deviation is the ' due period value T ' when no deviation occurs, and the percentage of the ratio of the deviation value T ' to the due period value T is the metering deviation
b3According to the five ratio relations, five period values can be calculated, if the signal is complete, no noise interference exists, the equipment has no fault, and the five values are equal, namely the five values are real period values; if the calculated period values are different, downward checking is respectively carried out according to the data, the period value is determined according to the repeatability of the data, and then the period number is counted, so that the centralized reading function of the gas meter is realized.
Preferably, said step a2If there is no problem in filtering and selecting, then
Preferably, said step a3In (1)
The three ratios have no relation with the factors such as pipe network pressure, pipelines, gas appliances and the like.
Preferably, a1The pressure sensor can be a differential pressure sensor or an absolute pressure sensor, and aims to measure the pressure fluctuation condition of the gas transmission end of the diaphragm gas meter.
(III) advantageous effects
The invention provides an on-line monitoring method for metering performance of a membrane type gas meter. Compared with the prior art, the method has the following beneficial effects: the online monitoring method for the metering performance of the membrane type gas meter comprises the following specific working steps and analysis steps, wherein the specific working steps comprise the following steps: a is1According to the internal structure and the principle of the diaphragm gas meter, when pressure fluctuation in a period is ignored, stable pulsation phenomenon exists in gas conveying airflow, a pressure sensor is used for sampling, the waveform of the pressure fluctuation is analyzed, and each period has two peak values and two secondary peak values, a2Let the period be T and the time interval from the first peak to the first secondary peak be T1The time interval to the second secondary peak is t2The time interval to the second peak is t3，a3For a particular diaphragm gas meter,
the three ratios are all fixed and can be set
The characteristic values belong to equipment, the three characteristic values are calibrated and written in when the diaphragm gas meter leaves a factory and are recorded as a first group, a4In addition to the above three parameters, the device needs to write in at the beginning
As a second set, the ratio of the two characteristics can be set
The analyzing step comprises the steps of: b1If no and a can be found3When the first set of characteristic values are matched with the ratio relation, which may be caused by excessive metering error of the meter or fault of the meter, b2If the gas meter has internal leakage and external force influence, mechanical fault occurs and metering performance is influenced, b is the internal structure of the gas meter3According to the five ratio relations, five period values can be calculated, if the signal is complete, no noise interference exists, the equipment has no fault, and the five values are equal, namely the five values are real period values; if the calculated period values are different, the calculated period values are checked downwards respectively according to the data, the online monitoring of the metering performance of the diaphragm gas meter can be realized, the purpose of dynamically monitoring the performance of the diaphragm gas meter is achieved, meanwhile, the centralized reading and intelligentization of the diaphragm gas meter are indirectly realized through monitoring and analyzing the pressure fluctuation of the pipeline, and the method has great significance for the reconstruction of a stock meter.
Drawings
FIG. 1 is a waveform of the pressure fluctuation of the gas flow of the present invention;
FIG. 2 is a waveform diagram after processing by the filtering algorithm of the present invention;
FIG. 3 is a diagram of a mathematical model of the present invention;
fig. 4 is a schematic structural diagram of the gas meter and the pressure sensor of the present invention.
In the figure, 1 gas meter, 2 pressure sensor
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, an embodiment of the present invention provides a technical solution: the on-line monitoring method of the metering performance of the membrane type gas meter comprises the gas meter 1, a pressure sensor 2, specific working steps and analyzing steps, wherein the pressure sensor 2 is fixedly installed at the gas transmission end of the gas meter 1, and the specific working steps comprise the following steps:
a1according to the internal structure and the principle of the membrane type gas meter 1, when pressure fluctuation in a period is ignored, stable pulsation phenomenon exists in gas conveying airflow, the pressure sensor 2 is used for sampling, the waveform of the pressure fluctuation is analyzed, two peak values and two secondary peak values are arranged in each period, the two secondary peak values are located between the two peak values, the size of the peak values and the secondary peak values is related to pressure difference and related to connected pipelines and equipment, but the distribution of the peak values is stable and regular, and a waveform diagram is obtained by filtering pipe network fluctuation and through filtering algorithms such as smoothing and mean values;
a2let the period be T and the time interval from the first peak to the first secondary peak be T1The time interval to the second secondary peak is t2The time interval to the second peak is t3The time interval between two sub-peaks is t4The time interval between the second secondary peak and the second peak is t5Establishing a mathematical model diagram;
a3for a specific membrane gas meter 1,
the three ratios are all fixed and can be set
The method comprises the steps that the characteristic values belong to equipment, the membrane type gas meter 1 is calibrated and written into the three characteristic values when leaving a factory and is recorded as a first group, pressure waveforms can be extracted at any time in the later operation process, the measurement performance deviation and the equipment fault problem can be found in time through filtering, pipe network fluctuation removal, peak value finding, ratio calculation and comparison ratio, and the measurement error can be further judged, so that the quantitative analysis of the measurement error of the gas meter 1 is realized, the number of cycles can be further screened and counted, and the centralized reading and charging of the gas meter 1 are realized;
a4in addition to the above three parameters, the device needs to write in at the beginning
As a second set, the ratio of the two characteristics can be set
The analyzing step comprises the following steps:
b1if no and a can be found3When the first group of characteristic values are matched with the ratio relation, the measurement error of the meter is too large or the meter is in failure;
b2if the gas meter 1 has internal leakage and external force influence, mechanical failure occurs and the metering performance is influenced, according to the internal structure of the gas meter 1, t is hardly influenced1、t4、t5Three values exert equal influence, one can assume t separately1′、t4′、t5' for real measurements, three periods can be calculated:
the three period values are compared with t3Comparing the original writing characteristic period, wherein the period value with the maximum deviation is the ' due period value T ' when no deviation occurs, and the percentage of the ratio of the deviation value T ' to the due period value T is the metering deviation
b3According to the five ratio relations, five period values can be calculated, if the signal is complete, no noise interference exists, the equipment has no fault, and the five values are equal, namely the five values are real period values; if the calculated period values are different, the data are respectively checked downwards, the period value is determined according to the repeatability of the data, and then the period number is counted, so that the centralized reading function of the gas meter 1 is realized.
In the present invention, step a2Median filtered and selectedIf there is no problem, then
In the present invention, step a3In (1)
The three ratios have no relation with the factors such as pipe network pressure, pipelines, gas appliances and the like.
In the invention, the pressure sensor 2 can be a differential pressure sensor or an absolute pressure sensor, and aims to detect the pressure fluctuation condition of a gas transmission end of the diaphragm gas meter in the gas using process.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The on-line monitoring method for the metering performance of the membrane type gas meter comprises the steps of the gas meter (1), a pressure sensor (2), specific working steps and analysis, and is characterized in that: the gas transmission end of the gas meter (1) is fixedly provided with a pressure sensor (2) for measuring the pressure fluctuation condition of the gas transmission end in the gas meter, and the specific working steps comprise the following steps:
a1according to the internal structure and the principle of the diaphragm gas meter (1), when pressure fluctuation in a period is ignored, stable pulsation phenomenon exists in gas conveying airflow, a pressure sensor (2) is used for sampling, the waveform of the pressure fluctuation is analyzed, two peak values and two secondary peak values exist in each period, the two secondary peak values are located between the two peak values, the size of the peak values and the secondary peak values is related to pressure difference and related to connected pipelines and equipment, but the distribution of the peak values is stable and regular, and a waveform diagram is obtained after filtering pipe network fluctuation and smoothing and mean value filtering algorithms;
a2let the period be T and the time interval from the first peak to the first secondary peak be T1The time interval to the second secondary peak is t2The time interval to the second peak is t3The time interval between two sub-peaks is t4The time interval between the second secondary peak and the second peak is t5Establishing a mathematical model diagram;
a3for a specific membrane gas meter (1),
the three ratios are all fixed and can be set
The method comprises the steps that characteristic values of equipment are obtained, the membrane type gas meter (1) is calibrated and written into the three characteristic values when leaving a factory and is recorded as a first group, pressure waveforms are extracted at any time in the later operation process, the problems of measurement performance deviation and equipment faults can be found in time through filtering, pipe network fluctuation removal, peak value finding, ratio calculation and comparison, and the measurement error is further judged, so that quantitative analysis of the measurement errors of the gas meter (1) is realized, the number of cycles is further screened and counted, and the centralized reading and charging of the gas meter (1) are realized;
a4in addition to the above three parameters, the device needs to write in at the beginning
As a second set, the ratio of the two characteristics can be set
The analyzing step comprises the steps of:
b1if no and a can be found3When the first group of characteristic values are matched with the ratio relation, the measurement error of the meter is too large or the meter is in failure;
b2if the gas meter (1) has internal leakage and external force influence, mechanical failure occurs and the metering performance is influenced, according to the internal structure of the gas meter (1), t is hardly possibly influenced1、t4、t5Three values exert equal influence, assuming t respectively1′、t4′、t5For real measurements, three cycles are calculated:
the three period values are compared with t3Comparing the original writing characteristic period, wherein the period value with the maximum deviation is the ' due period value T ' when no deviation occurs, and the percentage of the ratio of the deviation value T ' to the due period value T is the metering deviation
b3Calculating five period values according to the relationship of the five ratios, wherein if the signal is complete and has no noise interference and no equipment has fault, the five values are equal, namely the five values are real period values; if the calculated period values are different, downward checking is carried out respectively according to the data, the period value is determined according to the repeatability of the data, and then the period number is counted, so that the centralized reading function of the gas meter (1) is realized.
2. The on-line monitoring method for the metering performance of the membrane gas meter according to claim 1, characterized in that: said step a2If there is no problem in filtering and selecting, then
3. The on-line monitoring method for the metering performance of the membrane gas meter according to claim 1, characterized in that: said step a3In (1)
The three ratios have no relation with the factors of pipe network pressure, pipelines and gas appliances.
4. The on-line monitoring method for the metering performance of the membrane gas meter according to claim 1, characterized in that: a is1The pressure sensor adopts a differential pressure sensor or an absolute pressure sensor, and aims to measure the pressure fluctuation condition of the gas output end of the gas meter.
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| CN111457977B (en) * | 2020-02-29 | 2021-09-24 | 浙江威星智能仪表股份有限公司 | Ultrasonic gas meter time sampling method aiming at pulsating flow influence |
| CN113155214B (en) * | 2021-05-12 | 2023-04-07 | 郑州安然测控技术股份有限公司 | Ultrasonic gas meter metering data sampling method and device |
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