Intelligent verification method and device for electronic water meter

Abstract

The invention discloses an intelligent verification method and device for an electronic water meter, and solves the problems of long verification time, high energy consumption and incomplete linearity correction of the electronic water meter in the prior art. The method comprises the following steps: dividing a correction curve of a verified meter into N correction sections, and initializing correction parameters; for each flow adjusting period, when the water flow reaches the verification flow F, the instantaneous flow of the standard meter is confirmed to be F, pulse signal period queues of the standard meter and the detected meter are collected, a correction coefficient is calculated, and the verification flow is adjusted; setting an initial maintenance positive curve, calculating the total acquisition time corresponding to the minimum number of queues of each flow section, and adjusting the flow adjustment period according to the maximum value of the total acquisition time; and comparing the correction curve parameter with the correction curve parameter of the same type of water meter, judging whether the detected meter meets the requirement or not, and verifying the detection result. Flow change is intelligently controlled through a self-learning and self-optimizing method, dynamic verification within a full-flow measurement range is achieved, verification time is short, and energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electronic water meter verification and calibration, and in particular to an intelligent verification method and device for an electronic water meter. Background Art

[0002] With the promotion of the concept of smart water services, electronic water meters (such as electromagnetic water meters and ultrasonic water meters) are gradually being accepted by the public for their advantages of high measurement accuracy, long life, remote intelligent management, historical data and alarm functions. In order to accurately measure water meters, they need to be calibrated by water flow calibration devices with relevant calibration capabilities. According to the calibration results, external operation adjustment devices, correction devices and auxiliary devices are used to make the water meter measurement performance fully meet its accuracy level.

[0003] However, when using water meters, it is easy for the measurement error of water meters in certain flow sections to exceed the maximum allowable error of the water meter. This is because the national metrological verification regulations for drinking cold water meters only stipulate that the commonly used flow Q3, the boundary flow Q2, and the minimum flow Q1 are the flow points that must be inspected. Even when evaluating the type of water meters, only a limited number of flow points will be added. Therefore, when the water meter is inspected at the factory, nonlinear corrections are often made at these special flow points to meet the measurement error requirements. In addition to the correction points, other flow sections usually use the correction values ​​of the corrected points to calculate the correction coefficients. When the actual water meter is used by the user, the flow is a variable value, which cannot be fixed, and it will not stabilize at the flow point that has been accurately corrected. However, due to differences in sensors and other reasons, the use of calculated correction coefficients cannot guarantee that the water meter is qualified in the full flow measurement range. A large number of verification flow points will greatly increase the production time and energy consumption of the water meter, which is not conducive to mass production and testing in terms of efficiency and cost. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of long calibration time, high energy consumption and incomplete linearity correction of electronic water meters in the prior art, and to provide an intelligent calibration method and device for electronic water meters. The method intelligently controls flow changes through self-learning and self-optimization methods to achieve dynamic calibration over the full flow measurement range. After the calibration, the flow characteristic curve of the meter being tested is automatically generated, and the overall error curve of the meter being tested is calibrated. The calibration time is short, energy consumption is saved, and the calibration efficiency and accuracy are high.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An intelligent verification method for an electronic water meter, characterized in that it comprises the following steps: S1: Divide the correction curve of the inspected table into N correction segments and initialize the correction parameters; S2: For each flow adjustment cycle, when adjusting the flow of the meter under test to F, confirm that the instantaneous flow of the standard meter is F, collect the pulse signal cycle queue of the standard meter and the pulse signal cycle queue of the meter under test, calculate the correction coefficient according to the ratio of the average pulse cycle of the meter under test to the average pulse cycle of the standard meter, and adjust the verification flow; S3: After the last traffic regulation cycle ends, set the initial inspection correction curve, calculate the total collection time corresponding to the minimum number of queues in each traffic segment, and adjust the traffic regulation cycle according to the maximum value of the total collection time; S4: Compare the correction curve parameters with the correction curve parameters of the same type of water meter in the database to determine whether the meter under test meets the requirements and verify the test results.

[0006] The intelligent calibration method of the electronic water meter provided by the present invention intelligently controls the flow change through self-learning and self-optimization methods, realizes dynamic calibration of the full flow measurement range, automatically generates the flow characteristic curve of the meter under test after the calibration, and performs overall error curve calibration on the meter under test. The acquisition time of each flow point can be automatically optimized and adjusted to control the calibration time of the full flow section. When calibrating the error curve, long-term calibration is not required, and the duration is extremely short. While meeting the calibration accuracy requirements, the working time is compressed, achieving the effect of energy saving and consumption reduction.

[0007] Preferably, if the calibration result does not meet the requirements, the reversal method is used to verify and calibrate the standard meter, and then the meter being tested is recalibrated; if the calibration result meets the requirements, the correction curve obtained from this calibration is extracted, calculated with the correction curve of the same type of water meter in the database, and merged into a new comprehensive correction curve according to the weight.

[0008] The correction curve obtained from each calibration can be calculated with the comprehensive correction curve of the same type of water meter in the database, and integrated into the new comprehensive correction curve according to the weight, so that the curve is closer and closer to the ideal correction value of this type of meter, thereby improving the calibration accuracy.

[0009] As a preference, it also includes self-optimizing flow points: selecting verification flow points in sequence, if the correction value of a certain flow point is close to the correction values ​​of the flow points before and after it, then optimizing and absorbing the two flow points before and after it.

[0010] Preferably, the calculation of the total acquisition time corresponding to the minimum number of queues in each traffic segment includes: for a certain traffic segment, analyzing the standard meter pulse signal cycle queue and the inspected meter pulse signal cycle queue, reducing the queue from the tail and calculating the pulse average cycle average value and the average correction coefficient, obtaining the minimum number of queues and the corresponding total acquisition time that satisfy the preset offset threshold value of the difference between the average correction coefficient and the first cycle correction coefficient.

[0011] Preferably, in step S2, if the flow rate of the meter under test is adjusted to F and the instantaneous flow rate of the standard meter is not F, the frequency converter frequency or valve opening is adjusted, and the adjusted frequency converter frequency and valve opening are saved as new P and V.

[0012] Preferably, in step S4, if the degree of match between the correction curve parameters and the correction curve parameters of the same type of water meter in the database reaches a preset matching threshold, the inspected meter is judged to meet the consistency requirements; if the degree of match is less than the preset matching threshold or the collection time is insufficient, the calibration is restarted; if the degree of match is still less than the preset matching threshold, the water meter maintenance process is entered and the calibration is terminated.

[0013] Preferably, the correction parameters include a correction flow point queue F, a correction coefficient queue C, a frequency converter frequency value queue P corresponding to each flow point, a regulating valve opening queue V and a flow regulation period T; the correction coefficient is the ratio of the average pulse period of the tested meter to the average pulse period of the standard meter within the flow regulation period.

[0014] Preferably, in step S4, verifying the test result includes: using the reversing method to verify the commonly used flow rate Q 3 , boundary flow Q 2 , minimum flow Q 1 Perform a verification test.

[0015] An intelligent verification device for an electronic water meter, comprising: The flow regulating device adjusts the entire flow section according to the set flow trend, and makes fine adjustments according to the feedback results of each standard table during the calibration process; For standard meters, the flow rate response time is consistent with that of the meter being tested; The pulse output signal comparison device uses a high-speed and high-precision timer to collect the pulse cycle, receives the pulse signals of the meter under test and the standard meter for real-time comparison, determines the coefficient / deviation of the meter under test relative to the standard meter, and transmits the comparison parameters to the calibration device controller; The controller of the calibration device analyzes the comparison parameters, obtains the coefficients of the meter under test and the correction curve of the entire flow range, and performs periodic inspections on the standard meter.

[0016] As a preference, it also includes: Water reservoir, which stores water for calibration and receives water returned from standard measuring tanks or pipelines; A standard metering tank transmits the standard amount of water flowing into the metering tank to the controller of the calibration device; The commutator switches the water flow to the standard metering tank at the beginning of the calibration and switches it to the reservoir when the water volume reaches the predetermined capacity.

[0017] Therefore, the present invention has the following beneficial effects: 1. Only one set of pulse output signal comparison device is added. The real-time signal output of the high-precision standard meter is used for comparison with the meter under test. The correction curve of the meter under test can be adjusted quickly, the calibration time is short, and the meter under test can be dynamically calibrated during the flow change process. The component cost is low. At the same time, a high-speed and high-precision timer is used to collect the pulse period. Compared with the number of collected pulses, its resolution is higher, and the pulse frequency can be accurately measured within a limited number of pulse periods, further shortening the calibration time.

[0018] 2. It can automatically optimize and adjust the collection time of each flow point, control the calibration time of the entire flow section, and compress the working time while meeting the calibration accuracy requirements, thereby achieving energy saving and consumption reduction. The correction curve obtained from each calibration can be calculated with the comprehensive correction curve of the same type of water meter in the database, and integrated into the new comprehensive correction curve according to the weight, so that the curve is getting closer and closer to the ideal correction value of this type of instrument, thereby improving the calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a flow chart of the steps of the intelligent verification method of the electronic water meter in the present invention.

[0020] Figure 2 This is a schematic diagram of the electronic water meter system architecture.

[0021] Figure 3 Schematic diagram of multi-point nonlinear correction for electronic water meters.

[0022] Figure 4 It is a schematic diagram of the flow rate regulation process of the intelligent verification method of the electronic water meter in the present invention.

[0023] Figure 5 The intelligent verification method T of the electronic water meter in the present invention 0 to T 1 Schematic diagram of time period pulse output signal acquisition.

[0024] Figure 6 It is a schematic diagram of flow point optimization of the intelligent calibration method of the electronic water meter in the present invention.

[0025] Figure 7 It is a schematic diagram of the structure of the intelligent calibration device of the electronic water meter in the present invention.

[0026] In the figure: 1. Water reservoir; 2. Standard metering tank; 3. Commutator; 4. Bottom valve; 5. Pressure regulating tank; 6. Frequency converter; 7. Water pump; 8. Inlet valve; 9. Test meter; 10. Standard meter; 11. Control valve; 12. Pulse output signal comparison device; 13. Calibration device controller; 14. Measuring sensor; 15. Calculator; 16 Indicator; 17. Auxiliary device; 18. Correction device; 19. Adjustment device. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Embodiment 1: This embodiment provides an intelligent verification method for an electronic water meter. Figure 1 As shown, the operation flow is as follows: Step 1, divide the correction curve of the meter under test into N correction segments, and initialize the correction parameters; Step 2, for each flow adjustment cycle, adjust the flow of the meter under test to F and confirm that the instantaneous flow of the standard meter is F at this time, collect the pulse signal cycle queues of the standard meter and the meter under test, calculate the correction coefficient, and adjust the calibration flow; Step 3, set the initial inspection correction curve, calculate the total acquisition time corresponding to the minimum number of queues in each flow segment, and adjust the flow adjustment cycle according to the maximum value of the total acquisition time; Step 4, compare the correction curve parameters with the correction curve parameters of the same type of water meter, determine whether the meter under test meets the requirements, and verify the calibration results.

[0028] The intelligent calibration method of the electronic water meter provided in this embodiment intelligently controls the flow change through self-learning and self-optimization methods, realizes dynamic calibration of the full flow measurement range, automatically generates the flow characteristic curve of the meter under test after the calibration, and performs overall error curve calibration on the meter under test. The acquisition time of each flow point can be automatically optimized and adjusted to control the calibration time of the full flow section. When calibrating the error curve, long-term calibration is not required, and the duration is extremely short. While meeting the calibration accuracy requirements, the working time is compressed to achieve the effect of energy saving and consumption reduction.

[0029] The technical scheme and technical effects of the present invention will be further described below through specific examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0030] like Figure 2 As shown, the existing electronic water meter usually includes a flow sensor 14, a calculator 15, an indicating device 16, an adjusting device 19, a correcting device 18 and an auxiliary device 17. In order to make the water meter measure accurately, it needs to be calibrated by a water flow calibration device with relevant calibration capabilities, and according to the calibration results, an external operating adjusting device, a correcting device and an auxiliary device are used to make the water meter measurement performance fully meet its accuracy level.

[0031] Existing electronic water meters are often tested at the factory at the commonly used flow rate Q 3 , boundary flow Q 2 , minimum flow Q 1 These special flow points are corrected nonlinearly to meet the measurement error requirements, and other flow segments except the correction points usually use the correction values ​​of the corrected points to calculate the correction coefficients, such as Figure 3However, this method cannot guarantee that the water meter is qualified in the full flow measurement range. A large number of calibration flow points will greatly increase the production time and energy consumption of the water meter, which is not conducive to mass production testing in terms of efficiency and cost.

[0032] Therefore, this embodiment provides an intelligent calibration method for an electronic water meter to solve the following technical problems: the nonlinear correction problem will cause the water meter to exceed the error standard when measuring certain flow sections. Simply increasing the calibration flow points for correction is not advisable because the flow calibration device includes a water pump, valves, frequency converters, and measuring standard instruments. Increasing the flow points directly leads to an extension of the calibration time, and various devices must be running at all times, thereby wasting a lot of electricity.

[0033] Specifically, Figure 1 As shown, an intelligent verification method for an electronic water meter comprises the following steps: Step 1: Divide the correction curve of the inspected table into N correction segments and initialize the correction parameters.

[0034] like Figure 4 As shown, the correction curve of the meter under inspection is subdivided into N segments (much larger than the normal 6 correction segments), each segment is a flow regulation cycle. The correction parameters include: correction flow point queue F (evenly distributed according to the flow measurement range, including flow point data F 0 ~F N ), correction coefficient queue C (including data C 0 ~C N ), corresponding to the inverter frequency value queue P of each flow point (including data P 0 ~P N ) and the control valve opening queue V (including data V 0 ~V N ), flow regulation cycle T (the minimum step cycle of the inverter frequency and the regulating valve opening, which controls the speed at which the flow rate in the pipeline decreases).

[0035] Step 2: For each flow adjustment cycle, adjust the flow of the meter under test to F and confirm that the instantaneous flow of the standard meter is F at this time, collect the pulse signal cycle queues of the standard meter and the meter under test, calculate the correction coefficient, and adjust the calibration flow.

[0036] The specific manifestations are: (1) Set initial parameters.

[0037] When the water flow reaches the upper flow limit F of the meter under test 0 When the instantaneous flow rate is F, read the instantaneous flow rate in the standard table and confirm whether the instantaneous flow rate in the standard table is F 0 If yes, proceed to the next step. If no, adjust the inverter frequency or the regulating valve opening and save the adjusted inverter frequency as the new P 0 , save the valve opening as a new V0 , at this time point T 0 , instantaneous flow rate F 0 , corresponding to the inverter frequency P 0 , valve opening V 0 , correction factor C 0 .

[0038] (2) Start calibrating the meter under test using the dynamic standard table comparison method.

[0039] 1) The first flow regulation cycle.

[0040] This time is T 0 , the instantaneous flow rate is F 0 , the corresponding inverter frequency is P 0 , the valve opening is V 0 , the correction factor is C 0 , receiving the pulse signal of the meter under test and the standard meter, in the first flow adjustment cycle T (i.e. T 0 to T 1 Time period), collect the pulse signal cycle queue t of the pulse output signal of the standard meter s01 ~t s0n And the pulse signal cycle queue t of the pulse output signal of the meter under test b01 ~t b0n ,like Figure 5 shown.

[0041] By calculating the two sets of pulse cycle queues, the standard table can be obtained in T 0 to T 1 The average pulse period of the time period is TS 0 , the table under inspection is in T 0 to T 1 The average pulse period of the time period is TB 0 , the pulse period is inversely proportional to the flow rate, then the correction coefficient C of the first flow regulation period can be obtained 0 =TB 0 / TS 0 Even if the pulse signals of the two meters are not synchronized, it will not affect the comparison accuracy.

[0042] 2) The second flow regulation cycle.

[0043] After the first flow adjustment cycle T, according to the frequency converter P 1 and valve opening V 1 , (by adjusting the frequency of the inverter and the valve opening) adjust the flow rate of the meter under test to F 1 , read the instantaneous flow rate from the standard table and confirm that it is F at this time 1 , if the flow rate is not F 1, then adjust the inverter frequency or the regulating valve opening, and save the adjusted inverter frequency and regulating valve opening as the new P 1 and V 1 . At this time, the time is T 1 , the instantaneous flow rate is F 1 , the corresponding inverter frequency is P 1 , valve opening V 1 , the correction factor is C 1 .

[0044] In the second flow regulation cycle T, the pulse signal cycle queue t of the new standard meter pulse output signal is collected. s11 ~t s1n And the pulse signal cycle queue t of the pulse output signal of the meter under test b11 ~t b1n , get the standard table at T 0 to T 1 The average pulse period of the time period is TS 1 , the table under inspection is in T 0 to T 1 The average pulse period of the time period is TB 1 , the pulse period is inversely proportional to the flow rate, then we can get C 1 =TB 1 / TS 1 .

[0045] 3) The last flow regulation cycle.

[0046] Repeat the above steps until the last flow adjustment cycle, at which time is T N , the instantaneous flow rate is F N , the corresponding inverter frequency is P N , the valve opening is V N , the correction factor is C N .

[0047] Specifically, in the last flow regulation cycle T, the pulse signal cycle queue t of the pulse output signal of the new standard meter is collected. sN1 ~t sNn And the pulse signal cycle queue t of the pulse output signal of the meter under test bN1 ~t bNn , get the standard table at T N to T N+1 The average pulse period of the time period is TS N , the table under inspection is in T N to T N+1 The average pulse period of the time period is TB N , the pulse period is inversely proportional to the flow rate, then we can get C N =TB N / TSN .

[0048] Step 3: Set the initial inspection correction curve, calculate the total collection time corresponding to the minimum number of queues in each traffic segment, and adjust the traffic adjustment cycle according to the maximum value of the total collection time.

[0049] Read the pulse signal cycle queue of each flow segment (t s01 ~t s0n to sN1 ~t sNn )、Pulse signal cycle queue of the meter under test(t b01 ~t b0n to bN1 ~t bNn ) and correction factor (C 0 To C N ), F 0 ~F N The correction coefficients of the flow points are set as C 0 ~C N .

[0050] For the first flow segment F 0 , analyze the standard table pulse signal cycle queue t s01 ~t s0n And the pulse signal cycle queue t of the meter under test b01 ~t b0n , reduce the queue from the end of the queue and calculate the average value TS' 0 TB' 0 and coefficient C' 0 =TB' 0 / TS' 0 , and satisfy C' 0 ≈C 0 The minimum number of queues k and the corresponding total collection time T' whose difference meets the predefined offset threshold ΔC 0 .

[0051] Repeat this step to analyze F 0 ~F N For all traffic segments, calculate the total collection time T' corresponding to the minimum number of queues in all traffic segments 0 ~T' N , take the maximum value T' max , according to T' max The decrease in the flow rate can shorten the flow adjustment period T to achieve the purpose of self-optimization verification time. If T' max If the value is close to T, T should be increased to avoid correction deviation due to insufficient acquisition time.

[0052] Step 4: Compare the correction curve parameters with those of the same type of water meter to determine whether the meter under test meets the requirements and verify the calibration results.

[0053] The correction curve parameter C 0 ~C N Compare the parameters of the comprehensive correction curve of the same type of water meter in the database. If they are basically consistent, it can be determined that the meter under test meets the consistency requirements. If they do not meet the requirements or the collection time is insufficient, the calibration will be automatically restarted. If the result of the re-calibration of the meter under test still does not meet the consistency requirements, the water meter maintenance process will be entered and the calibration will be terminated. If they meet the requirements, the calibration results will be verified.

[0054] During verification, the commonly used flow rate Q is measured according to the national water meter measurement verification regulations. 3 , boundary flow Q 2 , minimum flow Q 1 Carry out a verification test, the verification test adopts the reversing method, that is, the flow rate is stable at the verification point Q 1 , Q 2 , Q 3 Start verification at .

[0055] If the calibration result does not meet the accuracy requirements of the water meter, the standard meter may have an abnormality. The reversing method is used to verify and calibrate the indication error, repeatability and stability of the standard meter, and then the calibration is restarted. If the calibration result meets the requirements, the correction curve obtained in this calibration is extracted and calculated with the comprehensive correction curve of the same type of water meter in the database. The curve is integrated into the new comprehensive correction curve according to the weight, so that the curve becomes closer and closer to the ideal correction value of this type of meter.

[0056] When the number of water meters of the same type is large enough, the comprehensive correction data curve is close to the ideal correction value of the meter of this type. At this time, the flow point merging operation can be performed. Specifically, select the verification flow point F in turn. 0 ~F N When the correction value of a flow point is close to the correction value of the flow points before and after it, the two flow points before and after can be absorbed in an optimized manner to shorten the time without affecting the performance.

[0057] The intelligent verification method of an electronic water meter provided in this embodiment has the following beneficial effects: (1) By comparing the real-time signal output of the high-precision standard meter with the meter under test, the correction curve of the meter under test can be quickly adjusted, and the meter under test can be dynamically calibrated during the flow change process.

[0058] (2) It can automatically optimize and adjust the collection time of each flow point, control the calibration time of the entire flow section, and compress the working time while meeting the calibration accuracy requirements, thereby achieving the effect of energy saving and consumption reduction.

[0059] (4) Self-optimization of water meter correction curve: The correction curve obtained from each calibration can be calculated with the comprehensive correction curve of the same type of water meter in the database, and integrated into the new comprehensive correction curve according to the weight, so that the curve is closer and closer to the ideal correction value of this type of meter. This curve also becomes an important basis for verifying the consistency of water meters; (5) Self-optimization of flow regulation: Precisely control and adjust the frequency converter and control valve to adjust the entire flow range according to the set flow trend. During the calibration process, the frequency converter frequency and the opening of the control valve can be fine-tuned according to the feedback results of each standard table to make them more in line with the set calibration flow point. The fine-tuned frequency converter and control valve parameters will be saved and continuously optimized in subsequent calibrations.

[0060] Embodiment 2: This embodiment provides an intelligent calibration device for an electronic water meter, which is used to implement the intelligent calibration method for an electronic water meter in the first embodiment, dynamically calibrate the meter under test during flow changes, and achieve calibration of the entire flow range.

[0061] like Figure 7 As shown, an intelligent calibration device for an electronic water meter comprises a water reservoir 1, a standard metering tank 2, a commutator 3, a bottom valve 4, a pressure regulating tank 5, a frequency converter 6, a water pump 7, an inlet valve 8, a meter to be tested 9, a standard meter 10, a regulating valve 11, a pulse output signal comparison device 12 and a calibration device controller 13. The frequency converter, the water pump and the regulating valve constitute a flow regulating device. The commutator is respectively connected to the standard metering tank, the regulating valve and the water reservoir. The standard metering tank is respectively connected to the bottom valve and the calibration device controller. The bottom valve is respectively connected to the water reservoir. The water storage tank is connected to the pressure-stabilizing tank, the pressure-stabilizing tank is connected to the water pump, the water pump is connected to the inlet valve and the frequency converter respectively, the frequency converter is connected to the calibration device controller, the inlet valve is connected to the calibration device controller and the meter under test respectively, the meter under test is connected to the calibration device controller, the standard meter and the pulse output signal comparison device respectively, the pulse output signal comparison device is connected to the calibration device controller and the standard meter respectively, the standard meter is connected to the calibration device controller and the regulating valve respectively, and the regulating valve is connected to the calibration device controller.

[0062] Specific: (1) Water reservoir: It stores sufficient water for calibration purposes and receives water directly returned from standard measuring tanks or pipelines.

[0063] (2) Standard measuring tank: A standard volume tank or a weighing tank with a scale, used as a calibration standard container, which can transmit the standard amount of water flowing into the standard measuring tank to the calibration device controller.

[0064] (3) Commutator: used to switch the water flow. When the calibration starts, the commutator switches the water flow to the standard metering tank. When the water volume reaches the predetermined capacity, the water flow is switched to the reservoir. The water volume for this calibration can then be stably read.

[0065] (4) Bottom valve: When the bottom valve is closed, water flows into the standard measuring tank for temporary storage; when the bottom valve is opened, the water in the standard measuring tank is directly discharged into the reservoir for the next calibration.

[0066] (5) Pressure regulating tank: stabilizes water flow and eliminates the influence of bubbles.

[0067] (6) Frequency converter: The frequency converter can realize precise control and speed regulation of the water pump. Its acceleration curve can also be selected (linear acceleration, S-shaped acceleration or automatic acceleration). The operating speed can be adjusted at any time as needed through the remote control PLC or other controller.

[0068] (7) Water pump: Provides a controllable flow of calibration water under the control of the frequency converter.

[0069] (8) Inlet valve: fully open or fully closed. Keep fully open after the pump starts and enters the calibration process.

[0070] (9) Meter under test: The electronic water meter with pulse output function under test.

[0071] (10) Standard meter: A high-precision, high-stability flow meter (accuracy level better than 0.2), with pulse output function and data communication function, and the flow rate response time (damping time) is consistent with the meter being tested.

[0072] (11) Control valve: By adjusting the valve opening, it works together with the frequency converter to control the water cooling flow in the pipeline.

[0073] (12) Pulse output signal comparison device: Receives pulse signals from the meter under test and the standard meter for real-time comparison, determines the coefficient / deviation of the meter under test relative to the standard meter, and transmits the comparison parameters to the calibration device controller through a high-speed communication interface.

[0074] (13) Calibration device controller: controls the operation of motors, water pumps, valves and other components. It can read the calibration capacity of the standard metering tank, the instantaneous flow value of the standard meter, and the comparison data of the pulse output signal comparison device. After comprehensive analysis of the pulse comparison data of the standard metering tank, the meter under test and the standard meter, the coefficient of the meter under test and the correction curve of the entire flow range are obtained. The standard meter can also be periodically tested.

[0075] The steps of performing intelligent verification of an electronic water meter using the intelligent verification device for an electronic water meter provided in this embodiment are as follows: Step (1): Initialize the intelligent verification device.

[0076] The meter to be tested is loaded into the intelligent calibration device. The calibration device controller starts the inverter and water pump. The inlet valve and regulating valve are fully opened, and the commutator is switched to the water reservoir. At this time, the intelligent calibration device operates under the default flow state and removes the gas in the system pipeline.

[0077] Step (2): Initialize the main parameters.

[0078] like Figure 4 As shown, the correction curve of the meter under test is subdivided into N segments (much larger than the normal 6 correction segments), and the correction flow point queue F (evenly distributed according to the flow measurement range, including flow point data F 0 ~F N ), correction coefficient queue C (including data C 0 ~C N ), corresponding to the inverter frequency value queue P of each flow point (including data P 0 ~P N ) and the control valve opening queue V (including data V 0 ~V N ), flow regulation cycle T (the minimum step cycle of the inverter frequency and the regulating valve opening, which controls the speed at which the flow rate in the pipeline decreases).

[0079] Step (3): Calibrate the meter under test.

[0080] Adjust the frequency converter so that the water flow rate reaches the upper flow limit F of the meter being tested. 0 , read the instantaneous flow rate of the standard table. Confirm that the instantaneous flow rate of the standard table is F 0 , if the instantaneous flow rate is not F 0 , then adjust the inverter frequency or the regulating valve opening, and save the adjusted inverter frequency and regulating valve opening as the new P 0 and V 0 . Start to calibrate the meter under test using the dynamic standard table comparison method.

[0081] Step (4): Calculate the correction factor.

[0082] This time is T 0 , instantaneous flow rate F 0 , corresponding to the inverter frequency P 0 , regulating valve opening V 0 , correction factor C 0 , the pulse output signal comparison device starts to receive the pulse signals of the meter under test and the standard meter. Within a flow adjustment cycle T (i.e. T 0 to T 1 Time period), collect the pulse signal cycle queue t of the pulse output signal of the standard meter s01 ~t s0n And the pulse signal cycle queue t of the pulse output signal of the meter under test b01~t b0n ,like Figure 5 shown.

[0083] A high-speed and high-precision timer is used during acquisition. By calculating two sets of pulse cycle queues, the standard table can be obtained at T 0 to T 1 The average pulse period of the time period is TS 0 , the table under inspection is in T 0 to T 1 The average pulse period of the time period is TB 0 , the pulse period is inversely proportional to the flow rate, then we can get C 0 =TB 0 / TS 0 , even if the pulse signals of the two meters are not synchronized, it will not affect the comparison accuracy.

[0084] Step (5): After a flow adjustment cycle T, according to the frequency converter P 1 and the regulating valve opening V 1 , adjust the flow rate to F 1 , read the instantaneous flow rate from the standard table and confirm that it is F at this time 1 , if the flow rate is not F 1 , then adjust the inverter frequency or the regulating valve opening, and save the adjusted inverter frequency and regulating valve opening as the new P 1 and V 1 .

[0085] Step (6): At this time, the time is T 1 , the instantaneous flow rate is F 1 , the corresponding inverter frequency is P 1 , the opening of the regulating valve is V 1 , the correction factor is C 1 , the pulse output signal comparison device collects the pulse signal cycle queue t of the new standard table pulse output signal in the next flow adjustment cycle T s11 ~t s1n And the pulse signal cycle queue t of the pulse output signal of the meter under test b11 ~t b1n , get the standard table at T 0 to T 1 The average pulse period of the time period is TS 1 , the table under inspection is in T 0 to T 1 The average pulse period of the time period is TB 1 , the pulse period is inversely proportional to the flow rate, then we can get C 1 =TB 1 / TS 1 .

[0086] Step (7): Repeat steps (5) to (6) until the last flow regulation cycle, at which time is T N , the instantaneous flow rate is F N , the corresponding inverter frequency is P N , the opening of the regulating valve is V N , the correction factor is C N , the pulse output signal comparison device collects the pulse signal cycle queue t of the new standard table pulse output signal in the next flow adjustment cycle T sN1 ~t sNn And the pulse signal cycle queue t of the pulse output signal of the meter under test bN1 ~t bNn , get the standard table at T N to T N+1 The average pulse period of the time period is TS N , the table under inspection is in T N to T N+1 The average pulse period of the time period is TB N , the pulse period is inversely proportional to the flow rate, then we can get C N =TB N / TS N .

[0087] Step (8): Initial inspection correction curve setting.

[0088] The calibration device controller reads the comparison data of all pulse output signal comparison devices, including the standard table pulse signal cycle queue (t s01 ~t s0n to sN1 ~t sNn )、Pulse signal cycle queue of the meter under test(t b01 ~t b0n to bN1 ~t bNn ) and correction factor (C 0 To C N ), the calibration device controller communicates with the instrument to be tested at F 0 ~F N The correction factor of the flow point is set to C 0 ~C N .

[0089] Step (9): Self-optimization calibration time.

[0090] Calibration device controller analyzes the standard table pulse signal cycle queue t s01 ~t s0n And the pulse signal cycle queue t of the meter under test b01 ~t b0n , reduce the queue from the end of the queue and calculate the average value TS'0 TB' 0 and coefficient C' 0 =TB' 0 / TS' 0 , and finally we can get C' 0 ≈C 0 The minimum number of queues k and the corresponding total collection time T' whose difference meets the predefined offset threshold ΔC 0 .

[0091] Step (10): According to the process of step (9), analyze F one by one 0 ~F N For all traffic segments, calculate the total collection time T' corresponding to the minimum number of queues in all traffic segments 0 ~T' N , take the maximum value T' max , according to T' max The decrease in the flow rate can shorten the flow adjustment period T to achieve the purpose of self-optimization verification time. If T' max If the value is close to T, T should be increased to avoid correction deviation due to insufficient acquisition time.

[0092] Step (11): Correction curve parameter C 0 ~C N The water meter is compared with the comprehensive correction curve parameters of the same type of water meter in the database. If they are basically consistent, it can be determined that the water meter meets the consistency requirements. If they are not consistent or the collection time is insufficient, the calibration is automatically restarted (execute steps (3) to (8)). If they are still inconsistent, the water meter maintenance process is entered and the calibration is terminated. If they are consistent, the calibration process continues.

[0093] Step (12): Verification of curve correction results.

[0094] According to the national water meter measurement verification regulations, the commonly used flow rate Q 3 , boundary flow Q 2 , minimum flow Q 1 The three flow points are verified once, and the verification and verification adopts the reversing method, that is, the flow is stable at the verification point Q 1 , Q 2 , Q 3 Start calibration: close the bottom valve, the commutator switches to the standard metering tank, and the intelligent calibration device starts to collect the number of pulses of the meter being tested. The calibration device controller reads the value of the standard metering tank. When the preset water volume is reached, the commutator switches to the water reservoir. The calibration device controller reads the final standard water volume and compares it with the water volume represented by the number of pulses of the meter being tested during the calibration period to obtain the water value error.

[0095] Step (13): Verification of test results.

[0096] After the verification is completed, if the verification result does not meet the water meter accuracy requirements, the standard meter may be abnormal. Use the reversing method to verify and calibrate the indication error, repeatability and stability of the standard meter, and then start again from step (2).

[0097] Step (14): If the calibration result meets the requirements, the correction curve obtained from this calibration is extracted and calculated with the comprehensive correction curve of the same type of water meter in the database. The curve is integrated into the new comprehensive correction curve according to the weight, so that the curve is closer and closer to the ideal correction value of this type of meter, which also becomes an important basis for verifying the consistency of the water meter.

[0098] Step (15): This verification is completed.

[0099] Step (16): Self-optimize traffic points.

[0100] According to step (14), when the number of water meters of the same type that have been calibrated is sufficient, the comprehensive correction data curve is infinitely close to the ideal correction value of this type of meter, and the flow point merging operation can be performed at this time.

[0101] Specifically, the flow rate points F are selected in sequence. 0 ~F N When the correction value of a flow point is close to the correction values ​​before and after it, the two flow points before and after can be optimized and absorbed to shorten the time without affecting the performance. Figure 6 As shown, flow point F m-1 、F m and F m+1 The comprehensive correction coefficients are C m-1 , C m and C m+1 When the difference ratio of the three is less than a certain threshold (such as the error of the converted water value is less than 0.2%), F is cancelled. m-1 and F m+1 Two flow points, according to this method can greatly optimize the calibration time, the more the number of similar water meters calibrated, the faster and more accurate the calibration speed of this device.

[0102] The intelligent calibration device of an electronic water meter provided in this embodiment has the following beneficial effects: (1) By comparing the real-time signal output of the high-precision standard meter with the meter under test, the intelligent calibration device quickly adjusts the correction curve of the meter under test and can dynamically calibrate the meter under test during flow changes.

[0103] (2) Compared with traditional calibration devices, only one set of output signal comparison device is added, the component cost is low, and calibration of the entire flow range can be achieved through precise control of the software system.

[0104] (3) The pulse output signal comparison device uses a high-speed and high-precision timer to collect the pulse period. Compared with collecting the number of pulses, its resolution is higher and it can accurately measure the pulse frequency within a limited number of pulse periods.

[0105] (4) It can automatically optimize and adjust the collection time of each flow point, control the calibration time of the entire flow section, and compress the working time while meeting the calibration accuracy requirements, thereby achieving the effect of energy saving and consumption reduction.

[0106] (5) Self-optimization of water meter correction curve: The correction curve obtained from each calibration can be calculated with the comprehensive correction curve of the same type of water meter in the database, and integrated into the new comprehensive correction curve according to the weight, so that the curve is closer and closer to the ideal correction value of this type of meter. This curve also becomes an important basis for testing the consistency of water meters.

[0107] (6) Self-optimization of flow regulation: Accurately control and adjust the frequency converter and valve to adjust the entire flow range according to the set flow trend. During the calibration process, the frequency converter frequency and the opening of the regulating valve can be fine-tuned according to the feedback results of each standard table to make them more in line with the set calibration flow point. The fine-tuned frequency converter and valve parameters will be saved and continuously optimized in subsequent calibrations.

[0108] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. An intelligent verification method for an electronic water meter, characterized in that: The following steps are involved: S1: Divide the correction curve of the inspected table into N correction segments and initialize the correction parameters; S2: For each flow adjustment cycle, adjust the flow of the meter under test to F and confirm that the instantaneous flow of the standard meter is F at this time, collect the pulse signal cycle queues of the standard meter and the meter under test, and calculate the correction coefficient according to the average pulse cycle; S3: Set the initial inspection correction curve, calculate the total collection time corresponding to the minimum number of queues in each traffic segment, and adjust the traffic adjustment cycle according to the maximum value of the total collection time; S4: Compare the correction curve parameters with those of the same type of water meter correction curve parameters to determine whether the meter under test meets the requirements and verify the calibration results.

2. The intelligent verification method of an electronic water meter according to claim 1, characterized in that: In step S4, if the verification result does not meet the requirements, the standard meter is verified and calibrated by the reversal method, and then the meter under test is re-verified; If the calibration result meets the requirements, extract the correction curve obtained from this calibration, calculate it with the correction curve of the same type of water meter in the database, and merge the correction curve obtained from this calibration into the new comprehensive correction curve according to the weight.

3. The intelligent verification method of an electronic water meter according to claim 1 or 2, characterized in that: It also includes self-optimization flow points: select the calibration flow points in sequence, if the correction value of a flow point is close to the correction value of the flow points before and after it, the two flow points before and after it will be optimized and absorbed.

4. The intelligent verification method of an electronic water meter according to claim 1 or 2, characterized in that: The calculation of the total acquisition time corresponding to the minimum number of queues in each traffic segment includes: for a certain traffic segment, analyzing the pulse signal cycle queue of the standard meter and the pulse signal cycle queue of the meter under test, reducing the queue from the tail and calculating the pulse average cycle average value and the average correction coefficient, obtaining the minimum number of queues and the corresponding total acquisition time that satisfy the preset offset threshold value of the difference between the average correction coefficient and the first cycle correction coefficient.

5. The intelligent verification method of an electronic water meter according to claim 1 or 2, characterized in that: In step S2, if the flow rate of the meter under test is adjusted to F and the instantaneous flow rate of the standard meter is not F, the frequency converter frequency or valve opening is adjusted, and the adjusted frequency converter frequency and valve opening are saved as new P and V.

6. The intelligent verification method of an electronic water meter according to claim 1, characterized in that: In step S4, if the matching degree between the correction curve parameters and the correction curve parameters of the same type of water meter in the database reaches a preset matching threshold, the meter under test is judged to meet the consistency requirements; if the matching degree is less than the preset matching threshold or the collection time is insufficient, the calibration is restarted; if the matching degree is still less than the preset matching threshold, the water meter maintenance process is entered and the calibration is terminated.

7. An intelligent verification method for an electronic water meter according to claim 1, 2 or 6, characterized in that: The correction parameters include a correction flow point queue F, a correction coefficient queue C, a frequency converter frequency value queue P corresponding to each flow point, a regulating valve opening queue V and a flow regulation period T; the correction coefficient is the ratio of the average pulse period of the tested meter to the average pulse period of the standard meter within the flow regulation period.

8. An intelligent verification method for an electronic water meter according to claim 1, 2 or 6, characterized in that: In the step S4, verifying the test result includes: using the reversing method to perform a verification test on the common flow Q3, the boundary flow Q2, and the minimum flow Q1.

9. An intelligent verification device for an electronic water meter, using an intelligent verification method for an electronic water meter as claimed in any one of claims 1 to 8, characterized in that: include: The flow regulating device adjusts the entire flow section according to the set flow trend, and makes fine adjustments according to the feedback results of each standard table during the calibration process; For standard meters, the flow rate response time is consistent with that of the meter being tested; The pulse output signal comparison device receives the pulse signals of the meter under test and the standard meter for real-time comparison, determines the coefficient / deviation of the meter under test relative to the standard meter, and transmits the comparison parameters to the calibration device controller; The controller of the calibration device analyzes the comparison parameters, obtains the coefficients of the meter under test and the correction curve of the entire flow range, and performs periodic inspections on the standard meter.

10. The intelligent verification device for an electronic water meter according to claim 9, characterized in that: Also includes: Water reservoir, which stores water for calibration and receives water returned from standard measuring tanks or pipelines; A standard metering tank transmits the standard amount of water flowing into the metering tank to the controller of the calibration device; The commutator switches the water flow to the standard metering tank at the beginning of the calibration and switches it to the reservoir when the water volume reaches the predetermined capacity.

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