CN115218969B - High-precision measurement and leakage detection method based on electromagnetic water meter - Google Patents
High-precision measurement and leakage detection method based on electromagnetic water meter Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 504
- 238000005259 measurement Methods 0.000 title claims abstract description 110
- 238000001514 detection method Methods 0.000 title claims abstract description 20
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 19
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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
- G01F1/56—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 using electric or magnetic effects
- G01F1/58—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 using electric or magnetic effects by electromagnetic flowmeters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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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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Abstract
The invention discloses a high-precision measurement and leak detection method based on an electromagnetic water meter, which solves the problem of low measurement precision of the electromagnetic water meter in the prior art and comprises the following steps: s1: correcting the zero point of the electromagnetic water meter; s2: monitoring the running state of the electromagnetic water meter, and judging whether the electromagnetic water meter can normally run or not; s3: the electromagnetic water meter is utilized to measure the water consumption data of the user in real time, and the measurement result is analyzed; s4: dividing the water use area into a plurality of independent areas, and carrying out leak detection on water supply pipelines in the independent areas by using an electromagnetic water meter. The electromagnetic water meter measuring precision is improved, and the measuring error caused by magnetic field interference can be compensated. Meanwhile, the water pressure and the flow of water supplied by a user can be controlled according to the measurement data of the electromagnetic water meter.
Description
Technical Field
The invention relates to the technical field of flow metering instruments, in particular to a high-precision measurement and leakage detection method based on an electromagnetic water meter.
Background
The electromagnetic water meter has the advantages of wide measuring range, small starting flow, high measuring precision, long service life, stable and reliable long-term operation, small pressure loss, capability of directly remotely transmitting measured data to a system platform in a communication mode and the like, is widely applied to the water service industry of cities, is used for replacing the mechanical water meter and is used for trade settlement of water consumption of water users.
However, when the electromagnetic water meter is calibrated by a third party and installed and used on site, the zero point of the electromagnetic water meter is influenced by different on-site installation stresses, water quality, water temperature, conductivity, environment and other factors to generate deviation. In actual use, the working principle of the electromagnetic water meter is based on Faraday electromagnetic induction law, so that the magnitude of the magnetic induction intensity of the magnet has an influence on the metering performance of the electromagnetic water meter, and under the same condition, the larger the magnetic induction intensity is, the larger the influence on the metering performance of the water meter is; therefore, the situation that the normal measurement of the electromagnetic water meter is influenced by the interference of the strong magnet may exist, so that the measured data of the electromagnetic water meter have deviation, and the actually measured flow of the electromagnetic water meter is smaller than the actual flow.
The above-mentioned situations all can cause errors in the measurement of the electromagnetic water meter, so how to improve the measurement accuracy of the electromagnetic water meter is a problem to be solved in the present.
Disclosure of Invention
The invention aims to solve the problem of low measurement precision of an electromagnetic water meter in the prior art, and provides a high-precision measurement and leakage detection method based on the electromagnetic water meter, which improves the measurement precision of the electromagnetic water meter and can detect whether leakage exists in a water supply pipeline.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a high-precision measurement and leak detection method based on an electromagnetic water meter comprises the following steps:
S1: correcting the zero point of the electromagnetic water meter;
s2: monitoring the running state of the electromagnetic water meter, and judging whether the electromagnetic water meter can normally run or not;
S3: the electromagnetic water meter is utilized to measure the water consumption data of the user in real time, and the measurement result is analyzed;
s4: dividing the water use area into a plurality of independent areas, and carrying out leak detection on water supply pipelines in the independent areas by using an electromagnetic water meter.
The measurement of the electromagnetic water meter is real-time, and the electromagnetic water meter can send the measurement result to the central platform in real time as long as the measurement exists. The metering leak is generally referred to as a flow meter due to errors in metering of the meter, and is also referred to as apparent leak. The invention can reduce the influence of zero point on the measurement result and compensate the measurement error caused by magnetic field interference, thereby improving the measurement accuracy of the electromagnetic water meter and reducing the measurement leakage. Meanwhile, the water consumption habit of a user can be intelligently analyzed according to the measurement data of the electromagnetic water meter.
Preferably, the step S1 is further expressed as:
S1.1: collecting an excitation signal of an electromagnetic water meter and judging an excitation mode of the electromagnetic water meter;
s1.2: if the excitation mode is a continuous mode, comparing a measurement signal when the electromagnetic water meter is currently in no-flow with a measurement signal when the electromagnetic water meter is in no-flow when leaving the factory, and judging whether the electromagnetic water meter is in a static state or not when the electromagnetic water meter is in no-flow;
s1.3: and (3) correcting the zero point of the electromagnetic water meter according to the judgment result in the step S1.2.
And collecting an electromagnetic water meter excitation signal, outputting an electromagnetic water meter excitation signal waveform, and judging an electromagnetic water meter excitation mode according to the waveform. The application adopts the high-precision continuously excited electromagnetic water meter, so that the electromagnetic water meter is initially detected by judging the excitation mode of the electromagnetic water meter, and then the zero point of the electromagnetic water meter is corrected. And collecting a measurement signal without excitation of the electromagnetic water meter in use, and comparing the measurement signal with excitation of the electromagnetic water meter without excitation when leaving the factory, so as to judge whether the electromagnetic water meter is in a static state under the condition of no flow, wherein the static state under the condition of no flow is that no reading of the electromagnetic water meter is generated (output is 0). If the electromagnetic water meter still outputs in the no-flow state, the zero point needs to be corrected until the electromagnetic water meter outputs 0 when no-flow is met.
Preferably, the step S2 is further expressed as:
s2.1: collecting electromagnetic water meter data information and lithium battery power consumption;
S2.2: judging whether the collected data information is normal or not and whether the residual electric quantity of the lithium battery is normal or not, and if not, sending alarm information and position information;
S2.3: and carrying out positioning maintenance on the electromagnetic water meter according to the position information sent by the electromagnetic water meter.
In the use process of the electromagnetic water meter, inaccurate reading caused by the fault of the electromagnetic water meter can occur, so that the electromagnetic water meter needs to be detected. The data threshold is generally set, the data information of the electromagnetic water meter is collected in real time (or according to fixed time), the collected data is compared with the threshold, and whether the electromagnetic water meter happens or not is judged. If the electromagnetic water meter fails, fault information is required to be sent, and a worker is reminded to repair and replace the electromagnetic water meter in time. The electromagnetic water meter data information comprises: the electromagnetic water meter comprises an excitation coil resistance, a fluid resistance, a converter power parameter, an environment temperature where the electromagnetic water meter is located, an internal temperature of the electromagnetic water meter and electromagnetic water meter position information, namely a user position represented by the electromagnetic water meter, so that a maintainer can accurately position the electromagnetic water meter and maintain the electromagnetic water meter.
Preferably, the specific steps for collecting the power consumption of the lithium battery of the electromagnetic water meter are as follows:
a1: collecting working currents of the electromagnetic water meter in different working states;
a2: collecting working time of the electromagnetic water meter under different working states;
a3: and calculating the total power consumption and the residual power of the lithium battery of the electromagnetic water meter, and judging whether the residual power is lower than a power threshold.
The working states comprise a calibration state, a dormant state, a measurement state, a zero point correction state, an error correction state, a magnetic field anti-interference state and the like. Collecting working current of the electromagnetic water meter under each state, and counting working time when the electromagnetic water meter is in different working states, so as to calculate power consumption of the lithium battery of the electromagnetic water meter under each working state, and accumulating, and subtracting the accumulated power consumption from the power consumption of the lithium battery to obtain the residual power of the lithium battery. If the calculated lithium battery residual electric quantity is lower than the electric quantity threshold value, the battery is required to be replaced, and alarm information is sent to remind workers of timely replacing the battery.
Preferably, in the step S3, the specific steps of using the electromagnetic water meter to perform measurement are:
b1: opening an excitation coil of the electromagnetic water meter, collecting induction voltage generated by the conductive fluid, and calculating the flow velocity of the conductive fluid;
b2: closing an excitation coil of the electromagnetic water meter, collecting impedance voltage of fluid in a pipeline, and calculating the flow rate of non-conductive fluid;
b3: and calculating the flow rate of the conductive fluid and the flow rate of the nonconductive fluid respectively by using the measured flow rates of the conductive fluid and the nonconductive fluid.
The induced voltage of the conductive fluid (such as water) is collected in the presence of a magnetic field, so that the flow rate of the conductive fluid can be obtained, and the impedance voltage of the fluid is collected in the absence of a magnetic field, so that the flow rate of the non-conductive fluid can be obtained. So that the flow rates of the conductive fluid and the non-conductive fluid can be calculated separately.
Preferably, in the step S3, the method further includes correcting the measurement result:
c1: collecting the stable time of exciting current generated by an exciting coil in an electromagnetic water meter under the condition of no external magnetic field interference;
c2: when the electromagnetic water meter is used, the stable time of exciting current generated by an exciting coil in the electromagnetic water meter is collected periodically;
c3: comparing the stable time acquired in the step c1 and the step c2, and correcting the measurement result of the electromagnetic water meter according to the comparison result.
When the external magnetic field is interfered, the external magnetic field can influence the stable time of exciting current generated by the exciting coil, so that only the stable time of exciting current when the external magnetic field is interfered and the stable time of exciting current when the external magnetic field is not interfered are compared, whether the external magnetic field is interfered can be known, and whether the measurement result of the electromagnetic water meter is required to be corrected is judged.
Preferably, the method further comprises detecting an external disturbing magnetic field:
setting a magnetic induction intensity threshold of an external disturbing magnetic field; and collecting the magnetic induction intensity of the electromagnetic water meter interference magnetic field, judging whether the magnetic induction intensity of the interference magnetic field is larger than a threshold value, and if so, sending an alarm signal.
Generally, when the magnetic induction intensity of the external interference magnetic field is less than 0.3T, the electromagnetic water meter metering performance is in a qualified range. When the magnetic induction intensity is larger than 0.4T, the electromagnetic water meter has larger measurement error change, and the disqualification situations are common and disqualified in demarcation flow; the minimum flow and demarcation flow metering performance is relatively obviously affected by the magnet; the variation of the performance error of the common flow measurement is smaller than the variation of the minimum flow and the demarcation flow.
Preferably, in the step S3, analyzing the measurement result includes:
d1: constructing a user water information data set by taking a user name of the user electromagnetic water meter as a unit;
d2: constructing a histogram of water consumption and time in one day according to the water consumption in the user water consumption information data set;
d3: fitting a trend curve graph of water consumption trend in one day according to the histogram in a period of time;
d4: analyzing the water consumption peak, the water consumption valley, the water consumption increase peak and the daytime water consumption and the nighttime water consumption of a user according to the graph;
d5: analyzing the total water consumption peak, the total water consumption valley, the total water consumption increment peak, the total daytime water consumption and the total night water consumption of the users in the area;
d6: and distributing the water pressure and the flow of the users in the area and different time periods in the area according to the analysis result.
According to the water consumption data of the user collected by the electromagnetic water meter, analyzing the water consumption data to obtain the water consumption habit of the user, and according to the water consumption habit of the user, automatically adjusting and distributing the water pressure and flow supply among all areas at different periods of water consumption of the user so as to achieve the supply balance of all areas; and at the same time, the water distribution of each user can be accurately achieved. The peak-staggering water consumption is realized, and the problems that the water pressure of the high floor is low and the water flow cannot go up in the water consumption peak period are prevented. Specifically, according to the user water consumption data collected by the electromagnetic water meter, the user water consumption data are analyzed to obtain the user water consumption habit, and according to the user water consumption habit, the water pressure and flow supply among all areas can be automatically regulated and distributed at different periods of the user water consumption so as to achieve the balance of the supply of all areas; meanwhile, the water distribution of each user can be accurately achieved, and particularly in the water use peak period in the area, the water use can be further accurately adjusted according to the water use conditions among different users. The peak-staggering water consumption is realized, the problems that the water pressure of the high floor is low and the water flow cannot go up in the water consumption peak period are prevented, and the water consumption management is intelligent.
Preferably, in the step d4, analyzing the peak of the increase in the water consumption of the user includes:
d4.1: dividing the time of day into n time periods, and respectively calculating the increment tn in each time period;
d4.2: setting an increment threshold t0, and judging whether the increment tn in each time period is larger than t0 or not;
d4.3: if tn is greater than t0, the water pressure and flow distribution in the time period are distributed according to the maximum water consumption in the time period.
The water consumption regulation is carried out according to the water consumption period, so that the water consumption trough is likely to appear in the period, but the water consumption suddenly increases at a certain time point in the period, so that the problem of insufficient water supply is caused. It is therefore necessary to calculate the peak increase in water.
Preferably, the step S3 further includes: and analyzing and processing the user water consumption data to obtain user bill information, generating a user water consumption report, and sending the report to the user. The user water usage report may include a user's daily water usage histogram, a daily water usage comparison analysis with the previous day, a current month and last month water comparison analysis, and so forth.
The step S4 is further expressed as:
S4.1: carrying out partition planning on a water supply area, and installing an electromagnetic water meter, wherein the electromagnetic water meter comprises a primary electromagnetic water meter installed at a water source, a water works and a water pool, a secondary electromagnetic water meter installed at a pipe network and a branch pipe, and a tertiary electromagnetic water meter installed at a water supply pipeline of a community;
S4.2: and according to the installation position of the electromagnetic water meter, combining water consumption data of a user to determine a leakage area.
Judging whether leakage exists in a water supply pipeline detected by the three-stage electromagnetic water meter by using water data of a user; judging whether leakage exists at a pipe network and a branch pipe detected by the secondary electromagnetic water meter by utilizing the water flow of each water supply pipeline; and judging whether leakage exists in the water source and the water works or not by utilizing the water flow detected by the secondary electromagnetic water meter.
Preferably, the step S4 further includes:
e1: measuring night flow of each water supply pipeline in the independent area by using the electromagnetic water meter, and uploading the measured night flow of the water supply pipeline and the position information of the electromagnetic water meter;
e2: classifying and marking the water supply pipeline and the user corresponding to the water supply pipeline;
and e3: calculating the minimum instantaneous flow of the water supply pipeline at night;
And e4: judging whether leakage exists in the water supply pipeline according to the minimum night instantaneous flow and combining the total night water consumption of the user corresponding to the water supply pipeline;
and e5: if leakage exists, the position information of the electromagnetic water meter is utilized to position the water supply pipeline with the leakage.
The step is to detect whether water leakage exists in the water supply pipeline detected by the three-stage electromagnetic water meter. The measurement information of the water supply pipeline is combined with the water measurement analysis result of the user, so that whether the water supply pipeline has leakage or not can be judged more accurately, and the leakage water supply pipeline can be positioned accurately by utilizing the positioning information of the electromagnetic water meter. In step e4, two methods are adopted to judge whether water leakage exists in the water supply pipeline, firstly, the time when the minimum instantaneous flow of the water supply pipeline is confirmed is compared with the total night water consumption of a user corresponding to the water supply pipeline at the time, whether the difference value of the total night water consumption meets a threshold value is judged, if the total night water consumption meets the threshold value, water leakage is not indicated, if the total night water consumption does not meet the threshold value, water leakage of the water supply pipeline is indicated, and the difference value of the total night water consumption is the water leakage. And secondly, directly comparing the minimum instantaneous flow at night with the minimum value of the total night water consumption of the water supply pipeline user, and if the difference value of the minimum instantaneous flow and the minimum value is larger than a threshold value, indicating that the water supply pipeline leaks water, wherein the difference value is the water leakage.
Preferably, the step e3 includes: the electromagnetic water meter is excited once every t1 seconds, and actively outputs a group of measurement data every t2 seconds;
And intercept the smallest measurement value in the output measurement data: comparing the measurement data uploaded in the current time with smaller measurement data obtained after the comparison in the previous time, and selecting the smaller measurement data of the current time and the smaller measurement data of the current time for storage; the process is repeated to obtain the minimum instantaneous flow at night.
Wherein t1 is not more than 0.5 seconds and t2 is not more than 2 seconds, thereby realizing real-time measurement and transmission of data. Grasping the minimum instantaneous flow of a water supply pipeline at night to judge whether leakage exists, and grasping and uploading instantaneous flow data by an electromagnetic water meter at the highest frequency as possible for analysis; the most accurate and true instantaneous flow data can be transmitted by high-frequency excitation and high-frequency data transmission.
Therefore, the invention has the following beneficial effects: 1. the zero point of the electromagnetic water meter can be corrected, the influence of the zero point on the small flow measurement is reduced, and the measurement precision is improved; 2. the influence of magnetic field interference can be reduced, the measurement error caused by the magnetic field interference can be compensated, and the accuracy of the measurement result is improved; 3. the electromagnetic water meter can analyze the measurement result of the electromagnetic water meter, and intelligently control the water pressure and flow of water supplied by a user according to the analysis result; 4. is capable of; the electromagnetic water meter is utilized to detect leakage of the water supply pipeline, and accurate positioning of the water supply pipeline is realized.
Drawings
FIG. 1 is a flow chart of the operation of the method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
In the embodiment shown in fig. 1, a high-precision measurement and leak detection method based on an electromagnetic water meter can be seen, and the operation flow is as follows: step one, correcting the zero point of an electromagnetic water meter; step two, monitoring the running state of the electromagnetic water meter, and judging whether the electromagnetic water meter can normally run or not; measuring the water consumption data of the user in real time by using an electromagnetic water meter, and analyzing the measurement result; dividing the water use area into a plurality of independent areas, and carrying out leak detection on water supply pipelines in the independent areas by using an electromagnetic water meter. The invention can reduce the influence of zero point on the measurement result, compensate the measurement error caused by magnetic field interference and improve the measurement accuracy of the electromagnetic water meter. Meanwhile, real-time water data collected by the electromagnetic water meter can be analyzed, so that water pressure and flow supply among all areas can be automatically regulated and distributed in different periods of water consumption later, and the balance of the supply of all areas can be achieved.
The technical scheme of the application is further described below by specific examples.
The first step: correcting zero point of electromagnetic water meter
The method comprises the steps of collecting electromagnetic water meter excitation signals, outputting electromagnetic water meter excitation signal waveforms, and judging electromagnetic water meter excitation modes according to the waveforms, wherein the electromagnetic water meter excitation modes comprise a continuous mode and a discontinuous mode (whether the waveforms are continuous or not is judged).
Judging whether the electromagnetic water meter is in a static state under no flow according to the excitation mode of the electromagnetic water meter:
if the excitation mode is a continuous mode, comparing a measurement signal when the electromagnetic water meter is currently in no-flow with a measurement signal when the electromagnetic water meter is in no-flow when leaving the factory, and judging whether the electromagnetic water meter is in a static state or not when the electromagnetic water meter is in no-flow.
And collecting an electromagnetic water meter excitation signal, outputting an electromagnetic water meter excitation signal waveform, and judging an electromagnetic water meter excitation mode according to the waveform. The application adopts the high-precision continuously excited electromagnetic water meter, so that the electromagnetic water meter is initially detected by judging the excitation mode of the electromagnetic water meter, and then the zero point of the electromagnetic water meter is corrected. And collecting a measurement signal without excitation of the electromagnetic water meter in use, and comparing the measurement signal with excitation of the electromagnetic water meter without excitation when leaving the factory, so as to judge whether the electromagnetic water meter is in a static state under the condition of no flow, wherein the static state under the condition of no flow is that no reading of the electromagnetic water meter is generated (output is 0). If the electromagnetic water meter still outputs in the no-flow state, the zero point needs to be corrected until the electromagnetic water meter outputs 0 when no-flow is met.
If the discontinuous excitation mode is adopted, comparing the difference value of the measurement signal when the electromagnetic water meter is currently in no-flow state and the measurement signal when the electromagnetic water meter is in no-flow state with the difference value of the measurement signal when the electromagnetic water meter is in no-flow state and the measurement signal when the electromagnetic water meter is in no-excitation state, and judging whether the electromagnetic water meter is in a static state when the electromagnetic water meter is in no-flow state.
And a second step of: monitoring the running state of the electromagnetic water meter, and judging whether the electromagnetic water meter can normally run or not
In the use process of the electromagnetic water meter, inaccurate reading caused by the fault of the electromagnetic water meter can occur, so that the electromagnetic water meter needs to be detected. The application mainly detects data information and lithium battery power consumption.
1. Data information
Setting an electromagnetic water meter data information threshold value, and collecting electromagnetic water meter data information in real time, wherein the collected data information comprises an exciting coil resistance value, a fluid resistance, a converter power parameter, an environment temperature where the electromagnetic water meter is positioned and an internal temperature of the electromagnetic water meter; comparing the acquired data information with a set data information threshold value, if the data information exceeds the threshold value, indicating that the data information is abnormal, and the electromagnetic water meter possibly has faults and needs to send alarm information to prompt a worker to repair and replace the electromagnetic water meter in time.
2. Lithium battery
Collecting working currents of the electromagnetic water meter in different working states, collecting working time of the electromagnetic water meter in different working states, calculating total power consumption and residual power of a lithium battery of the electromagnetic water meter, and judging whether the residual power is lower than a power threshold.
The working states comprise a calibration state, a dormant state, a measurement state, a zero point correction state, an error correction state, a magnetic field anti-interference state and the like. Collecting working current of the electromagnetic water meter under each state, and counting working time when the electromagnetic water meter is in different working states, so as to calculate power consumption of the lithium battery of the electromagnetic water meter under each working state, and accumulating, and subtracting the accumulated power consumption from the power consumption of the lithium battery to obtain the residual power of the lithium battery. If the calculated lithium battery residual electric quantity is lower than the electric quantity threshold value, the battery is required to be replaced, and alarm information is sent to remind workers of timely replacing the battery.
Specifically, as (for the current steady state):
The working current of the electromagnetic water meter is I1 under the calibration state, the working voltage is v1, and the working time is t6 under the calibration state; the working current is I2 in the measuring state, the working voltage is v2, and the working time length is t7 in the measuring state; the working current is I3 in the zero point correction state, the working voltage is v3, the working time is t8 in the zero point correction state, and the lithium battery residual electric quantity is as follows when the lithium battery is not operated in other working states:
q1=qtotal-i1×v1×t6—i2×v2×t7—i3×v3×t8.
If the current is unstable, the power consumption in each state is calculated by adopting an integral mode.
Meanwhile, the position information of the electromagnetic water meter is also collected, so that the electromagnetic water meter can be accurately positioned when the electromagnetic water meter fails.
And a third step of: real-time measurement of user water data by using electromagnetic water meter and analysis of measurement result
1. Measurement using electromagnetic water meter
The induced voltage of the conductive fluid (such as water) is collected in the presence of a magnetic field, so that the flow rate of the conductive fluid can be obtained, and the impedance voltage of the fluid is collected in the absence of a magnetic field, so that the flow rate of the non-conductive fluid can be obtained. So that the flow rates of the conductive fluid and the non-conductive fluid can be calculated, respectively, and thus the flow rate of the water containing impurities can be calculated.
The concrete steps are as follows:
opening an excitation coil of the electromagnetic water meter, collecting induction voltage U generated by the conductive fluid, and calculating the flow rate of the conductive fluid: vwater=u/(b×d), B represents magnetic induction, and D is the pipe inner diameter.
Closing an excitation coil of the electromagnetic water meter, collecting impedance voltage of fluid in a pipeline, and calculating the flow rate of non-conductive fluid: the method comprises the steps of firstly calculating the conductivity of the fluid by using impedance voltage, then calculating the content of non-conductive fluid in the fluid, and calculating the flow velocity of the non-conductive fluid by using a cross correlation algorithm.
And calculating the flow rate of the conductive fluid and the flow rate of the nonconductive fluid respectively by using the measured flow rates of the conductive fluid and the nonconductive fluid.
Knowing the flow rate, the flow rate can be calculated using the following formula:
the induced electromotive force E in the fluid is measured by two electrodes located radially opposite to each other. The induced electromotive force E is proportional to the magnetic induction intensity B, the pipe inner diameter (electrode spacing) D and the average flow velocity V. The magnetic induction intensity B and the electrode distance D are constants, and the induced electromotive force E is in direct proportion to the average flow velocity V:
e=b×d×v; from this, the average flow velocity V can be derived, which in turn yields the flow according to the following equation:
M=（π*D2*V）/4。
2. Correcting the measurement result
When strong magnetic field interference occurs in the electromagnetic water meter measuring process, the electromagnetic water meter measuring error is greatly changed, and the unqualified conditions are common and unqualified in demarcation flow; the minimum flow and demarcation flow metering performance is relatively obviously affected by the magnet; the common flow measurement performance error variation is smaller than the minimum flow and the demarcation flow variation; the parts with larger influence of the external interference magnetic field on the electromagnetic water meter are respectively the bottom, the front end and the rear end; the influence of the external interference magnetic field on the metering performance of the electromagnetic water meter is mainly negative metering deviation; after the magnet is removed, the metering performance of the electromagnetic water meter is restored to a normal state without magnetic interference.
That is, the external interference magnetic field with certain magnetic induction intensity has negative influence on the metering performance of the electromagnetic water meter. Therefore, it is necessary to further optimize the anti-interference capability of the electromagnetic water meter to magnetic induction, and the external interference magnetic field influence is eliminated by generally adopting modes such as increasing the distance between the exciting coil and the magnet of the electromagnetic water meter, externally installing the iron case with lock on the meter body, additionally installing the magnetic shielding mechanism during design and manufacture, and the like, so as to ensure the accuracy of metering of the electromagnetic water meter. However, the method can not completely eliminate the influence of an external interference magnetic field, and still can cause reading errors of the electromagnetic water meter.
When the external magnetic field is disturbed, the external magnetic field can influence the stable time of the exciting current generated by the exciting coil. Therefore, the application compares the stable time of the exciting current when the external magnetic field is interfered with the stable time of the exciting current when the external magnetic field is not interfered, and can know whether the external magnetic field is interfered or not, thereby judging whether the measurement result of the electromagnetic water meter is required to be corrected or not.
The concrete steps are as follows:
Collecting the stable time t4 of exciting current generated by an exciting coil in the electromagnetic water meter under the condition of no external magnetic field interference, and storing the stable time; when the electromagnetic water meter is used, the stabilization time t5 of exciting current generated by an exciting coil in the electromagnetic water meter is collected periodically.
When no external magnetic field is interfered, the time for stabilizing the exciting current generated by the exciting coil is fixed; at this time, if the external disturbing magnetic field affects the exciting coil of the electromagnetic water meter, the time for stabilizing the exciting current becomes longer, and the stabilizing time change of the exciting current and the strength of the external disturbing magnetic field are in direct proportion, and are also in direct proportion to the deviation of the flow measurement value of the electromagnetic water meter.
Therefore, comparing t4 with t5, if t4=t5, it means that there is no external magnetic field to interfere, and no compensation for measurement error is required; if t4< t5, it is indicated that there is an influence of the external disturbing magnetic field, and the measurement result needs to be corrected.
The compensation mode can be as follows:
R= (1+k (t 5-t 4)/t 4) R0, where k represents a sensor coefficient of the electromagnetic water meter, and E is a measurement result after correction; r0 is the measurement result before correction.
3. Analysis of the measurement results
And collecting water consumption data of users in the area within 15 days to obtain water consumption data of each user in the area and the total water consumption in the area. Analyzing the collected water consumption data to obtain the water consumption habit of the users in the area and the region:
Constructing a user water information data set by taking a user name of the user electromagnetic water meter as a unit; according to the water consumption in the user water consumption information data set, constructing a histogram of water consumption and time in one day, wherein the abscissa of the histogram is each time in one day, and the ordinate is the water consumption; a trend graph of water usage over the day was fitted based on the histogram for each of the 15 days.
Analyzing the user water use peak, the water use valley, the water use increase peak, and the daytime water use amount and the nighttime water use amount according to the graph, wherein analyzing the user water use increase peak comprises: dividing the time of day into n time periods, respectively calculating increment tn in each time period, setting an increment threshold t0, judging whether the increment tn in each time period is larger than t0, and if so, distributing the water pressure and the flow in the time period according to the maximum water consumption in the time period.
The water consumption regulation is carried out according to the water consumption period, so that the water consumption trough is likely to appear in the period, but the water consumption suddenly increases at a certain time point in the period, so that the problem of insufficient water supply is caused. It is therefore necessary to calculate the peak increase in water.
And analyzing the total water consumption peak, the total water consumption peak and the total daytime water consumption and the total nighttime water consumption of the users in the area. The analysis method is consistent with that of a single user.
According to the water consumption data of the user collected by the electromagnetic water meter, analyzing the water consumption data to obtain the water consumption habit of the user, and according to the water consumption habit of the user, automatically adjusting and distributing the water pressure and flow supply among all areas at different periods of water consumption of the user so as to achieve the supply balance of all areas; meanwhile, the water distribution of each user can be accurately achieved, and particularly in the water use peak period in the area, the water use can be further accurately adjusted according to the water use conditions among different users. The peak-staggering water consumption is realized, the problems that the water pressure of the high floor is low and the water flow cannot go up in the water consumption peak period are prevented, and the water consumption management is intelligent.
The method can also analyze and process the water consumption data of the single user collected by the electromagnetic water meter to obtain the bill information of the user, generate a water consumption report of the user and send the report to the user. Wherein the user water usage report may include a user daily water usage histogram, a daily water usage comparison analysis with a previous day, a current month and previous month water comparison analysis, and the like.
Fourth step: dividing the water use area into a plurality of independent areas, and carrying out leak detection on water supply pipelines in the independent areas by utilizing an electromagnetic water meter
Carrying out partition planning on a water supply area, and installing an electromagnetic water meter, wherein the electromagnetic water meter comprises a primary electromagnetic water meter installed at a water source, a water works and a water pool, a secondary electromagnetic water meter installed at a pipe network and a branch pipe, and a tertiary electromagnetic water meter installed at a water supply pipeline of a community; and according to the installation position of the electromagnetic water meter, combining water consumption data of a user to determine a leakage area.
When the three-level electromagnetic water meter performs leak detection, the specific steps are as follows:
Measuring night flow of each water supply pipeline in the independent area by using the electromagnetic water meter, and uploading the measured night flow of the water supply pipeline and the position information of the electromagnetic water meter: in this embodiment, the electromagnetic water meter is excited once every 0.3 seconds, and actively outputs a set of measurement data every 1.8 seconds.
The water supply pipeline and the user corresponding to the water supply pipeline are classified and marked.
Calculating the minimum instantaneous flow of the water supply pipeline at night: comparing the measurement data uploaded in the current time with smaller measurement data obtained after the comparison in the previous time, and selecting the smaller measurement data of the current time and the smaller measurement data of the current time for storage; the process is repeated to obtain the minimum instantaneous flow at night. Specific: if the smaller measured data after the comparison at the previous time is 25 and the measured data uploaded at the current time is 20, the smaller measured data after the comparison at the current time is 20, and the measured data and the time for obtaining the measured data are saved.
And according to the minimum instantaneous flow at night, combining the total water consumption of the user corresponding to the water supply pipeline at night, and judging whether leakage exists in the water supply pipeline. The total night water consumption of the user corresponding to the water supply pipeline can be judged according to a graph obtained by analyzing water consumption for a period of time, and can also be the result of real-time measurement and calculation.
Specifically, the following are: the minimum instantaneous flow rate of the water supply pipeline at night is 30, but the total night water consumption of the user corresponding to the water supply pipeline at the moment is 28, and the threshold value is 1, so that the water supply pipeline has leakage.
Embodiment two:
the present embodiment can detect an external disturbing magnetic field on the basis of the first embodiment:
Generally, when the magnetic induction intensity of the external interference magnetic field is less than 0.3T, the electromagnetic water meter metering performance is in a qualified range. When the magnetic induction intensity is larger than 0.4T, the electromagnetic water meter has larger measurement error change, and the disqualification situations are common and disqualified in demarcation flow; the minimum flow and demarcation flow metering performance is relatively obviously affected by the magnet; the variation of the performance error of the common flow measurement is smaller than the variation of the minimum flow and the demarcation flow.
Firstly, setting a magnetic induction intensity threshold of an external disturbing magnetic field; and collecting the magnetic induction intensity of the electromagnetic water meter interference magnetic field, judging whether the magnetic induction intensity of the interference magnetic field is larger than a threshold value, and if so, sending an alarm signal.
The above-described embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (10)
1. The high-precision measurement and leak detection method based on the electromagnetic water meter is characterized by comprising the following steps of:
S1: correcting the zero point of the electromagnetic water meter;
S2: monitoring the running state of the electromagnetic water meter, collecting data information of the electromagnetic water meter, working current and working time under different working states, calculating the residual electric quantity of the electromagnetic water meter according to whether the current is stable or not in different modes, and judging whether the electromagnetic water meter can normally run or not;
S3: the electromagnetic water meter is used for measuring the water consumption data of the user in real time, analyzing the measurement result, and accurately regulating the water consumption according to the water consumption conditions of different users in the water consumption peak period of the area;
S4: dividing the water use area into a plurality of independent areas, comparing the measurement data uploaded in the current time with smaller measurement data obtained after the comparison in the previous time, and selecting the smaller measurement data of the two areas for storage; and repeating the process to obtain the minimum instantaneous flow at night, and detecting leakage of the water supply pipelines in the independent area by using the minimum instantaneous flow at night.
2. The method for high-precision measurement and leak detection based on electromagnetic water meter according to claim 1, wherein the step S1 is further expressed as:
S1.1: collecting an excitation signal of an electromagnetic water meter and judging an excitation mode of the electromagnetic water meter;
s1.2: if the excitation mode is a continuous mode, comparing a measurement signal when the electromagnetic water meter is currently in no-flow with a measurement signal when the electromagnetic water meter is in no-flow when leaving the factory, and judging whether the electromagnetic water meter is in a static state or not when the electromagnetic water meter is in no-flow;
s1.3: and (3) correcting the zero point of the electromagnetic water meter according to the judgment result in the step S1.2.
3. The method for high-precision measurement and leak detection based on electromagnetic water meter according to claim 1 or 2, wherein the step S2 is further expressed as:
s2.1: collecting electromagnetic water meter data information and lithium battery power consumption;
S2.2: judging whether the collected data information is normal or not and whether the residual electric quantity of the lithium battery is normal or not, and if not, sending alarm information and position information;
S2.3: and carrying out positioning maintenance on the electromagnetic water meter according to the position information sent by the electromagnetic water meter.
4. The method for measuring and detecting leakage with high precision based on the electromagnetic water meter according to claim 1, wherein in the step S3, the specific steps of measuring the water consumption data of the user in real time by using the electromagnetic water meter are as follows:
b1: opening an excitation coil of the electromagnetic water meter, collecting induction voltage generated by the conductive fluid, and calculating the flow velocity of the conductive fluid;
b2: closing an excitation coil of the electromagnetic water meter, collecting impedance voltage of fluid in a pipeline, and calculating the flow rate of non-conductive fluid;
b3: and calculating the flow rate of the conductive fluid and the flow rate of the nonconductive fluid respectively by using the measured flow rates of the conductive fluid and the nonconductive fluid.
5. The method for high-precision measurement and leak detection based on electromagnetic water meter according to claim 4, wherein in the step S3, further comprising correcting the measurement result:
c1: collecting the stable time of exciting current generated by an exciting coil in an electromagnetic water meter without the interference of an external magnetic field, and storing the stable time;
c2: when the electromagnetic water meter is used, the stable time of exciting current generated by an exciting coil in the electromagnetic water meter is collected periodically;
c3: comparing the stable time acquired in the step c1 and the step c2, and correcting the measurement result of the electromagnetic water meter according to the comparison result.
6. The method for high-precision measurement and leak detection based on electromagnetic water meter according to claim 1,4 or 5, wherein in the step S3, analyzing the measurement result comprises:
d1: constructing a user water information data set by taking a user name of the user electromagnetic water meter as a unit;
d2: constructing a histogram of water consumption and time in one day according to the water consumption in the user water consumption information data set;
d3: fitting a trend curve graph of water consumption trend in one day according to the histogram in a period of time;
d4: analyzing the water consumption peak, the water consumption valley, the water consumption increase peak and the daytime water consumption and the nighttime water consumption of a user according to the graph;
d5: analyzing the total water consumption peak, the total water consumption valley, the total water consumption increment peak, the total daytime water consumption and the total night water consumption of the users in the area;
d6: and distributing the water pressure and the flow of the users in the area and different time periods in the area according to the analysis result.
7. The method for measuring and detecting leakage with high accuracy based on an electromagnetic water meter according to claim 6, wherein in the step d4, analyzing the peak of the increase of the water consumption of the user comprises:
d4.1: dividing the time of day into n time periods, and respectively calculating the increment tn in each time period;
d4.2: setting an increment threshold t0, and judging whether the increment tn in each time period is larger than t0 or not;
d4.3: if tn is greater than t0, the water pressure and flow distribution in the time period are distributed according to the maximum water consumption in the time period.
8. The method for high-precision measurement and leak detection based on electromagnetic water meter according to claim 1, wherein the step S4 is further expressed as:
S4.1: carrying out partition planning on a water supply area, and installing an electromagnetic water meter, wherein the electromagnetic water meter comprises a primary electromagnetic water meter installed at a water source, a water works and a water pool, a secondary electromagnetic water meter installed at a pipe network and a branch pipe, and a tertiary electromagnetic water meter installed at a water supply pipeline of a community;
S4.2: and according to the installation position of the electromagnetic water meter, combining water consumption data of a user to determine a leakage area.
9. The method for high-precision measurement and leak detection based on electromagnetic water meter according to claim 1 or 8, wherein the step S4 further comprises:
e1: measuring night flow of each water supply pipeline in the independent area by using the electromagnetic water meter, and uploading the measured night flow of the water supply pipeline and the position information of the electromagnetic water meter;
e2: classifying and marking the water supply pipeline and the user corresponding to the water supply pipeline;
and e3: calculating the minimum instantaneous flow of the water supply pipeline at night;
And e4: judging whether leakage exists in the water supply pipeline according to the minimum night instantaneous flow and combining the total night water consumption of the user corresponding to the water supply pipeline;
and e5: if leakage exists, the position information of the electromagnetic water meter is utilized to position the water supply pipeline with the leakage.
10. The method for high-precision measurement and leak detection based on electromagnetic water meter according to claim 1, wherein said step e3 comprises: the electromagnetic water meter is excited once every t1 seconds, and actively outputs a group of measurement data every t2 seconds; and intercept the smallest measurement value in the output measurement data: comparing the measurement data uploaded in the current time with smaller measurement data obtained after the comparison of the previous time, selecting the smaller measurement data of the current time and the smaller measurement data of the current time, storing the smaller measurement data, and recording the time for measuring the measurement data; the process is repeated to obtain the minimum instantaneous flow at night.
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