A flowmeter calibration method for an ultrasonic water meter calibration device

Abstract

This application relates to the field of flowmeter calibration technology, specifically providing a flowmeter calibration method for an ultrasonic water meter calibration device, aiming to solve the technical problem that existing solutions cannot achieve online testing of the flowmeter in ultrasonic water meter calibration devices. To this end, the flowmeter calibration method for the ultrasonic water meter calibration device of this application includes: setting a flow point to be calibrated and controlling the flow output component to output a stable water flow corresponding to the flow point to be calibrated; acquiring multiple instantaneous flow values ​​and a flow reference value of the flowmeter under stable water flow; determining the calibration result of the flow point to be calibrated based on the multiple instantaneous flow values ​​and the flow reference value; traversing all flow points to be calibrated to complete the calibration; and determining the overall calibration result of the flowmeter based on the calibration results of all flow points to be calibrated. In this way, periodic online calibration of the flowmeter in the ultrasonic water meter calibration device is achieved, improving the calibration efficiency of the flowmeter.

Description

Technical Field

[0001] This invention relates to the field of flow meter calibration technology, and specifically provides a flow meter calibration method for an ultrasonic water meter calibration device. Background Technology

[0002] The ultrasonic water meter calibration device is equipped with a high-precision instantaneous standard flow meter. It achieves stable flow output by setting a preset instantaneous flow value and providing feedback through readings. During actual operation, the calibration station's automatic control system (such as adjusting the frequency converter or valves) adjusts the centrifugal pump frequency and valve opening in real time, using the preset instantaneous flow rate as the target, until the actual flow rate reaches the set value and remains stable. Simultaneously, the instantaneous flow meter is used as the flow reference during the modeling process. By comparing the output value of the instantaneous flow meter with the ultrasonic water meter's detection value, relevant instrument coefficients are obtained, resulting in faster modeling and calibration compared to the start-stop calibration method. Therefore, the standard instantaneous flow meter is the metrological benchmark for the entire calibration station, and its accuracy directly determines the reliability and legitimacy of the calibration results of the tested water meter. Thus, it must be sent to a metrology institution for verification periodically.

[0003] Because ultrasonic water meter calibration devices operate for extended periods, calibration requires the removal and testing of the standard flowmeter. This often disrupts the device's normal operation during the testing period, severely hindering water meter development and calibration efficiency. Furthermore, the testing intervals cannot guarantee that the instantaneous flowmeter's measurement error remains within acceptable limits. When using the instantaneous flow method for modeling or calibration, significant errors are often introduced if the reference standard fails to meet requirements, resulting in water meters failing to meet metering standards upon leaving the factory. This poses a significant risk to product quality. Therefore, an online calibration method is urgently needed to periodically verify the flowmeter. Summary of the Invention

[0004] To overcome the aforementioned shortcomings, this application is proposed to provide a solution, or at least a partial solution, to the technical problem that existing solutions cannot achieve online flowmeter testing of ultrasonic water meter calibration devices. This application provides a flowmeter calibration method for ultrasonic water meter calibration devices.

[0005] This application provides a flow meter calibration method for an ultrasonic water meter calibration device, including:

[0006] Set the flow rate point to be verified and control the flow output component to output a stable water flow corresponding to the flow rate point to be verified;

[0007] The flow meter acquires multiple instantaneous flow rate values ​​and flow reference values ​​under the stable water flow condition;

[0008] The verification result of the flow point to be verified is determined based on multiple instantaneous flow values ​​and the flow reference value;

[0009] The verification is completed by traversing all the flow points to be verified, and the overall verification result of the flow meter is determined based on the verification results of all the flow points to be verified.

[0010] In one embodiment of the flowmeter calibration method for the ultrasonic water meter calibration device of this application, before setting the flow point to be calibrated, the method further includes:

[0011] The ultrasonic water meter calibration device divides the entire flow range into a first flow range and a second flow range, wherein the first flow range is a flow range less than or equal to a preset flow threshold, and the second flow range is a flow range greater than the preset flow threshold.

[0012] In one embodiment of the flow meter calibration method of the ultrasonic water meter calibration device of this application, the flow output component includes a first output component;

[0013] The acquisition of multiple instantaneous flow rates and flow reference values ​​of the flow meter under the stable water flow includes:

[0014] When the flow point to be verified is located in the first flow range, the preset output flow value that matches the flow point to be verified is used as the flow reference value. After the water flow output by the flow output component stabilizes, multiple instantaneous flow values ​​under stable water flow are obtained from the flow meter.

[0015] In one embodiment of the flow meter calibration method of the ultrasonic water meter calibration device of this application, the flow output component includes a second output component;

[0016] The acquisition of multiple instantaneous flow rates and flow reference values ​​of the flow meter under the stable water flow includes:

[0017] When the flow point to be verified belongs to the second flow range, after the water flow output by the flow output component stabilizes, multiple instantaneous flow values ​​under stable water flow are obtained from the flow meter, and the flow reference value is obtained through the weighing device.

[0018] In one embodiment of the flowmeter calibration method of the ultrasonic water meter calibration device of this application, the step of obtaining the flow reference value by weighing device includes:

[0019] Control the commutator to commutate so that a stable water flow is directed to the weighing device;

[0020] Obtain the cumulative water flow rate collected by the weighing device within a first preset time period;

[0021] The traffic baseline value is determined based on the accumulated traffic and the first preset duration.

[0022] In one embodiment of the flow meter calibration method of the ultrasonic water meter calibration device of this application, the step of determining the flow reference value based on the cumulative flow and the first preset duration includes: using the ratio of the cumulative flow to the first preset duration as the flow reference value.

[0023] In one embodiment of the flowmeter calibration method for the ultrasonic water meter calibration device of this application, determining the calibration result of the flow point to be calibrated based on multiple instantaneous flow values ​​and the flow reference value includes:

[0024] The average instantaneous flow rate is obtained based on multiple instantaneous flow rate values;

[0025] The flow error is determined based on the instantaneous average flow rate and the flow rate reference value;

[0026] Determine whether the flow error is less than a preset error threshold;

[0027] If yes, then the verification result of the traffic point to be verified is qualified; otherwise, it is unqualified.

[0028] In one embodiment of the flowmeter calibration method for the ultrasonic water meter calibration device of this application, before obtaining the average instantaneous flow rate based on multiple instantaneous flow rate values, the method further includes:

[0029] Determine the difference between the instantaneous flow rate value and the average instantaneous flow rate value;

[0030] Determine whether the absolute value of the difference is greater than a preset multiple of the standard deviation of the average instantaneous flow rates;

[0031] If so, then the instantaneous flow rate value is discarded.

[0032] In one embodiment of the flowmeter calibration method for the ultrasonic water meter calibration device of this application, determining the overall calibration result of the flowmeter based on the calibration results of all flow points to be calibrated includes:

[0033] Determine the number of flow points that fail the verification among all flow points to be verified;

[0034] Determine whether the number of traffic points that fail the verification is greater than a preset threshold.

[0035] If so, the flow meter is deemed unqualified; otherwise, it is qualified.

[0036] In one embodiment of the flowmeter calibration method for the ultrasonic water meter calibration device of this application, before obtaining multiple instantaneous flow rate values ​​and flow reference values ​​of the flowmeter under the stable water flow, the method further includes: opening a water flow of not less than a preset proportion of the maximum nominal flow rate of the ultrasonic water meter calibration device and continuing for a second preset duration to eliminate air bubbles in the pipeline of the ultrasonic water meter calibration device.

[0037] The above-described technical solutions of this application have at least one or more of the following beneficial effects:

[0038] The flowmeter calibration method of the ultrasonic water meter calibration device in this application includes: setting a flow point to be calibrated and controlling the flow output component to output a stable water flow corresponding to the flow point to be calibrated; acquiring multiple instantaneous flow values ​​and a flow reference value of the flowmeter under stable water flow; determining the calibration result of the flow point to be calibrated based on the multiple instantaneous flow values ​​and the flow reference value; completing the calibration by traversing all flow points to be calibrated; and determining the overall calibration result of the flowmeter based on the calibration results of all flow points to be calibrated. This enables periodic online calibration of the flowmeter of the ultrasonic water meter calibration device, ensuring that the metering accuracy is always within the allowable range, further improving the factory performance of the water meter, and solving the problem of low calibration efficiency caused by having to remove and send standard meters for calibration during accuracy calibration at the water meter calibration station, thus improving the calibration efficiency of the flowmeter. Attached Figure Description

[0039] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0040] Figure 1 This is a schematic diagram of the ultrasonic water meter calibration device in one embodiment of this application;

[0041] Figure 2 This is a schematic diagram of the main flow chart of the flow meter calibration method of the ultrasonic water meter calibration device in one embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the process for determining whether a flow meter has passed calibration in one embodiment of this application;

[0043] Figure 4 This is a schematic diagram of the flow meter calibration device in one embodiment of this application. Detailed Implementation

[0044] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0045] In the description of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and can also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0046] Currently, traditional ultrasonic water meter calibration devices require the removal and testing of a standard flowmeter. Furthermore, the intervals between testing cannot guarantee that the measurement error of the instantaneous flowmeter remains within acceptable limits. When using the instantaneous flow method for modeling or calibration, if the reference standard fails to meet requirements, significant errors are often introduced, resulting in water meters failing to meet metering standards upon leaving the factory, posing a significant risk to product quality. Therefore, this application provides a flowmeter calibration method for ultrasonic water meter calibration devices.

[0047] In such Figure 1 The schematic diagram of the overall structure of the ultrasonic water meter calibration device shown shows that the water tank 101 is a water storage unit, and its outlet is connected to the centrifugal pump 102 and the hydraulic pump 105 respectively. The hydraulic pump 105 includes a piston. The outlet of the centrifugal pump 102 is connected to the pressure stabilizing tank 103 and the first regulating valve 104 in sequence. The outlets of the hydraulic pump 105 and the first regulating valve 104 are connected to the water meter to be tested 106. The outlet of the water meter to be tested 106 is connected to the electromagnetic flowmeter 107 and the electromagnetic flowmeter 108, and then connected to the second regulating valve 109. The outlet of the second regulating valve 109 is connected to the reversing device 110. The reversing device 110 is connected to the weighing tank 111. An electronic scale 112 is set below the weighing tank 111. The drain pipe 113 of the reversing device 110 and the drain pipe 114 of the weighing tank 111 are both connected to the water tank 101 to form a complete water circulation loop.

[0048] See appendix Figure 2 , Figure 2 This is a schematic flowchart of the main steps of a flow meter calibration method for an ultrasonic water meter calibration device according to an embodiment of this application.

[0049] like Figure 2 As shown, the flow meter calibration method of the ultrasonic water meter calibration device in this application embodiment mainly includes the following steps S10-S40.

[0050] Step S10: Set the flow rate point to be verified and control the flow output component to output a stable water flow corresponding to the flow rate point to be verified.

[0051] The flow points to be calibrated refer to a series of representative flow values ​​that are pre-set to fully verify the measurement accuracy of a standard instantaneous flow meter across its entire range. These values ​​typically cover the small, medium, and large flow ranges of the flow meter.

[0052] The flow output component refers to the component in the ultrasonic water meter calibration device used to generate and output a stable water flow. It typically includes components such as a piston (for small flow), a centrifugal pump, a pressure stabilizing tank, a frequency converter, a regulating valve (for large flow), and a commutator.

[0053] Step S20: Obtain multiple instantaneous flow rates and flow reference values ​​of the flow meter under stable water flow conditions.

[0054] Instantaneous flow rate refers to the real-time flow rate data obtained by a standard flow meter from measuring a stable water flow within a preset time interval.

[0055] The flow baseline value refers to the true flow rate used for comparison and verification. In the low flow range, the flow baseline value is the set output flow rate of the piston; in the high flow range, the flow baseline value is the average instantaneous flow rate obtained by actual measurement and calculation using a high-precision weighing device.

[0056] Step S30: Determine the verification result of the flow point to be verified based on multiple instantaneous flow values ​​and flow reference values.

[0057] Step S40: Traverse all flow points to be verified to complete the verification, and determine the overall verification result of the flow meter based on the verification results of all flow points to be verified.

[0058] Based on steps S10-S40 above, firstly, the flow point to be calibrated is set, and the flow output component is controlled to output a stable water flow corresponding to the flow point to be calibrated; multiple instantaneous flow values ​​and flow reference values ​​of the flowmeter under stable water flow are obtained; the calibration result of the flow point to be calibrated is determined based on the multiple instantaneous flow values ​​and flow reference values; the calibration is completed by traversing all flow points to be calibrated, and the overall calibration result of the flowmeter is determined based on the calibration results of all flow points to be calibrated. In this way, online calibration of the flowmeter of the ultrasonic water meter calibration device is realized periodically, ensuring that the metering accuracy of the flowmeter is always within the allowable range, further improving the factory performance of the water meter, and solving the problem of low calibration efficiency caused by having to remove and send standard meters for calibration when performing accuracy calibration on the water meter calibration bench, thus improving the calibration efficiency of the flowmeter.

[0059] The following provides further explanation of steps S10 to S40.

[0060] Before executing step S10, high-precision electromagnetic flowmeters are generally used as standard instantaneous flowmeters in ultrasonic water meter calibration devices. However, because the measurement range of electromagnetic flowmeters is relatively narrow and cannot cover all flow points of the ultrasonic water meters, multiple electromagnetic flowmeters can be installed as standard instruments to ensure measurement accuracy. When selecting electromagnetic flowmeters, the test flow is divided into zones, and the flowmeters are selected according to their accuracy measurement range. For example, the accuracy of the electromagnetic flowmeter should be above 0.2%, and it should cover the entire range from the minimum to the maximum flow on the calibration bench. For instance, two or three electromagnetic flowmeters can be installed in the calibration device.

[0061] Specifically, for step S10 above, based on the full flow range of the ultrasonic water meter calibration device, a series of flow points to be calibrated are set according to preset rules. These points cover the minimum to maximum working flow of the device, ensuring that the calibration results are representative of the entire range. For example, for the flow range below 30 liters, the flow points to be calibrated are divided in steps of 2 L / hour; for the flow range between 30 liters and 200 liters, the flow points to be calibrated are divided in steps of 10 L / hour; and for the flow range above 200 liters, the flow points to be calibrated are divided in steps of 100 L / hour, thereby forming a flow point test table.

[0062] Subsequently, based on the current flow rate to be verified, the corresponding flow output component is automatically matched. For example, if the flow rate to be verified is a small flow rate (output flow rate value ≤ piston maximum output flow rate Vmax), then the piston is used as the output component of the flow rate to be verified; if it is a large flow rate (output flow rate value > piston maximum output flow rate Vmax), then the coordinated system of centrifugal pump, pressure tank, frequency converter and regulating valve is started. The speed of centrifugal pump is adjusted by frequency converter, fine adjustment is assisted by regulating valve, and water flow pulsation is absorbed by pressure tank, finally outputting a stable water flow without pulsation and with flow rate value highly consistent with the set point.

[0063] In addition, before acquiring multiple instantaneous flow values ​​and flow reference values ​​of the flow meter under the stable water flow, the method further includes: opening a water flow of not less than a preset proportion of the maximum nominal flow of the ultrasonic water meter calibration device and continuing for a second preset duration to eliminate air bubbles in the pipeline of the ultrasonic water meter calibration device.

[0064] The preset ratio can be a pre-set value, which can be adjusted adaptively according to the actual application scenario. For example, 0.75, 0.8, 0.9, etc. can be used as examples of the preset ratio.

[0065] The second preset duration can be a pre-set time value, such as 1 minute, 2 minutes, etc.

[0066] The maximum nominal flow rate Q3 is the maximum rated flow rate of the ultrasonic water meter calibration device.

[0067] For example, before performing online calibration, a high-flow-rate flush can be initiated by sequentially opening and closing the pipe valves for at least one minute. Here, "high-flow-rate" refers to a flow rate exceeding 0.75Q3 to eliminate the influence of air bubbles. Afterward, the online calibration process can be started. During online calibration, the entire flow range of the ultrasonic water meter calibration device is divided into a first flow range and a second flow range. The first flow range is the flow range less than or equal to a preset flow threshold, and the second flow range is the flow range greater than the preset flow threshold. Online calibration is performed separately for each of these two ranges.

[0068] The above is a further explanation of step S10. Step S20 will be further explained below.

[0069] In one embodiment, the flow output component includes a first output component, which is a piston; the step of obtaining multiple instantaneous flow values ​​and flow reference values ​​of the flow meter under the stable water flow includes: when the flow point to be verified is located in a first flow range, using a preset output flow value matching the flow point to be verified as the flow reference value; and after the water flow output by the flow output component stabilizes, obtaining multiple instantaneous flow values ​​under the stable water flow from the flow meter.

[0070] Specifically, when the output flow rate at the flow point to be calibrated is less than the piston's maximum output flow rate, the piston is used as the flow output component. First, a stable output flow rate (preset output flow rate value) is set for the piston; this flow rate serves as the flow reference value. When the ultrasonic water meter calibration device outputs a small flow rate, the piston is used as the flow output component, directly serving as the volume measurement tool. After setting the piston's output flow rate and waiting for it to stabilize, the piston's flow output remains unchanged. The electromagnetic flowmeter is then started to acquire the instantaneous flow rate value. This instantaneous flow rate value is acquired through the electromagnetic flowmeter's output interface. The electromagnetic flowmeter's output can be in analog or digital form. Analog outputs can include analog voltage output, pulse output, and 4-20mA current loop output. Digital outputs can select from serial communication, HART protocol, PROFIBUS DP / PA, and other bus protocols.

[0071] The collected instantaneous flow rate values ​​are stored in an array in real time. The array is configured to have a capacity of no less than 8192 double-precision numbers and records the time interval of data collection synchronously. After the data collection reaches the preset duration, multiple sets of valid instantaneous flow rate values ​​can be obtained.

[0072] Furthermore, the collected data can be filtered, specifically by using the Raida criterion to remove outlier data.

[0073] In one specific implementation, before obtaining the average instantaneous flow rate based on multiple instantaneous flow rate values, the method further includes: determining the difference between the instantaneous flow rate value and the average instantaneous flow rate value; determining whether the absolute value of the difference is greater than a preset multiple of the standard deviation of the multiple instantaneous flow rate values; if so, then discarding the instantaneous flow rate value.

[0074] For example, firstly, the average value of multiple instantaneous flow values ​​is determined, and the difference between each instantaneous flow value and the average instantaneous flow value is calculated. If the absolute value of the difference between a certain instantaneous flow value and the average instantaneous flow value exceeds 3 times the standard deviation, then the instantaneous flow value is regarded as an outlier and removed.

[0075] In another embodiment, the flow output component includes a second output component; acquiring multiple instantaneous flow values ​​and a flow reference value of the flow meter under stable water flow includes: when the flow point to be verified belongs to a second flow range, after the water flow output by the flow output component stabilizes, acquiring multiple instantaneous flow values ​​under stable water flow from the flow meter, and acquiring the flow reference value through a weighing device. Acquiring the flow reference value through the weighing device includes: controlling a commutator to redirect the stable water flow to the weighing device; acquiring the cumulative flow rate collected by the weighing device within a first preset time period; and determining the flow reference value based on the cumulative flow rate and the first preset time period. For example, the ratio of the cumulative flow rate to the first preset time period is used as the flow reference value.

[0076] The first preset duration can be a pre-set duration.

[0077] Specifically, when the output flow rate at the flow point to be calibrated exceeds the piston's maximum output flow rate, a centrifugal pump combined with a pressure stabilizing tank can achieve a larger output flow rate. Since the water flow directly output by the pump exhibits pressure / flow pulsations (especially with centrifugal pumps), it can cause instantaneous flow fluctuations, severely affecting calibration accuracy. Therefore, a pressure stabilizing tank is used as a smoothing device for the output flow rate. The compressibility of gas is utilized to absorb the pump's pulsations and short-term fluctuations, buffering and stabilizing the pressure, resulting in a very smooth water flow exiting the pressure stabilizing tank. When adjusting the flow output, precise flow output is achieved primarily through frequency converter control and regulating valve adjustment. When a set flow output is required, a standard flow meter is used to measure the current flow value in real time, and the output is controlled by the control system to quickly stabilize the flow rate at the set value. During implementation, the commutator is first set to the discharge position. A fixed flow point is set on the host computer, and the flow rate is stabilized within a certain range by adjusting the frequency converter output frequency and valve opening. A certain delay time is set to further stabilize the output flow rate.

[0078] During the calibration process, the commutator is activated to redirect the water flow, ensuring a constant flow rate to the high-precision weighing device. Simultaneously, the electromagnetic flowmeter's flow array is zeroed, and the output flow rate is collected at a set sampling frequency. The instantaneous flow rate values ​​are recorded in the electromagnetic flowmeter's flow array, and data is collected at specific time intervals (i.e., the first preset duration), such as one minute, to obtain multiple instantaneous flow rate values. The commutator is then activated for a second redirection, and the cumulative flow rate entering the weighing device is recorded. The ratio of the cumulative flow rate in the standard measuring device to the first preset duration is calculated to obtain the flow reference value.

[0079] In addition, the collected data can be filtered, specifically by using the Raida criterion to remove outlier data. For example, first, the average value of multiple instantaneous flow rates is determined, and the difference between each instantaneous flow rate and the average instantaneous flow rate is calculated. If the absolute value of the difference between a certain instantaneous flow rate and the average instantaneous flow rate exceeds three times the standard deviation, then that instantaneous flow rate is considered an outlier and removed.

[0080] The above is a further explanation of step S20. Step S30 will be further explained below.

[0081] Specifically, step S30 can be implemented through steps S301 to S304.

[0082] Step S301: Obtain the average instantaneous flow rate based on multiple instantaneous flow rate values.

[0083] Specifically, the average value of multiple instantaneous flow rates is obtained by averaging multiple instantaneous flow rates.

[0084] Step S302: Determine the flow error based on the instantaneous average flow rate and the flow rate reference value.

[0085] Specifically, this can be done by calculating the difference between the instantaneous average flow rate and the baseline flow rate, and using the absolute value of this difference as the flow rate error.

[0086] Step S303: Determine whether the flow error is less than the preset error threshold.

[0087] The preset error threshold can be a pre-defined error threshold, which can be adaptively adjusted according to the actual usage scenario. For example, 0.5%, 0.6%, 0.8%, etc. can be used as examples of preset error thresholds.

[0088] Step S304: If yes, then the verification result of the flow point to be verified is qualified; otherwise, it is unqualified.

[0089] Specifically, if the flow error is less than the preset error threshold, the verification result of the flow point to be verified is determined to be qualified; otherwise, it is deemed unqualified.

[0090] The above is a further explanation of step S30. Step S40 will be further explained below.

[0091] Specifically, step S40 can be implemented through steps S401 to S403.

[0092] Step S401: Determine the number of flow points that fail the verification among all flow points to be verified.

[0093] Step S402: Determine whether the number of unqualified flow points exceeds the preset threshold.

[0094] Step S403: If yes, then the flow meter calibration is deemed unqualified; otherwise, it is qualified.

[0095] Specifically, after all the flow points to be verified have been traversed, the number of unqualified flow points is checked. If the number of unqualified flow points exceeds the preset threshold, it is considered that the flow meter in the ultrasonic water meter calibration device has a certain error and needs to be recalibrated or replaced. Otherwise, it is considered that the flow meter in the ultrasonic water meter calibration device has passed the calibration and waits for the next cycle of calibration.

[0096] This application combines the standard flow output device and metering device of the household ultrasonic water meter calibration device. Different devices are used as flow output components for different flow points. An online calibration method is set according to different output components to complete the periodic online calibration of the flow meter of the household ultrasonic water meter calibration device. This ensures that the metering accuracy of the standard flow meter is always within the allowable range. While assisting in modeling through the standard meter method or the instantaneous flow method, it further improves the factory performance of the water meter and solves the problem of reduced calibration efficiency caused by the need to remove the standard meter for calibration when the water meter calibration station is performing accuracy calibration.

[0097] The flow meter calibration method of the ultrasonic water meter calibration device of this application, as described above, can be executed by a host computer. The host computer is connected to the test bench computer and the interaction between the host computer and the test bench equipment is realized through a network cable. The flow data of the flow output component is read in real time and the data is monitored and processed. At the same time, the calibration results of the flow meter are recorded synchronously.

[0098] In one embodiment, such as Figure 3 This is a flowchart illustrating the process for determining whether a flow meter is calibrated when the output flow rate at the flow point to be calibrated is greater than the maximum output flow rate of the piston.

[0099] S201: Set the current target flow rate value, which is the preset output flow rate value that the water pump outputs stably.

[0100] S202: Determine whether the current output flow rate has reached the target flow rate. If so, execute S203-S210. Otherwise, adjust the flow rate by adjusting the frequency converter and valve opening until the set value is reached.

[0101] S203: Record the initial weighing value.

[0102] S204: Controls commutator switching, records start time, and starts flow acquisition.

[0103] S205: Continuously determine whether the data collection will continue for the preset duration. If yes, proceed to S206; otherwise, continue with the data collection step.

[0104] S206: The commutator performs a second commutation, and the termination time and final weighing value are recorded.

[0105] S207: Calculate the flow baseline value by the difference between the final weighing value and the initial value and the time interval.

[0106] S208: Calculate the average instantaneous flow rate from the collected instantaneous flow rate values.

[0107] S209: Compare the instantaneous average flow rate with the flow rate baseline value, calculate and output the error, and further determine the verification result of the flow rate point to be verified based on the error.

[0108] S210: Determine whether to proceed to the next flow point's loop verification. If the loop has not ended, return to the current flow setting step to start the next round of verification; if the loop has ended, the entire high-flow-point verification process is complete.

[0109] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effect of this application, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of this application.

[0110] Furthermore, this application also provides a flow meter calibration device for ultrasonic water meter calibration devices.

[0111] See appendix Figure 4 , Figure 4 This is a main structural block diagram of the flow meter calibration device of an ultrasonic water meter calibration apparatus according to an embodiment of this application.

[0112] like Figure 4As shown, the flow meter calibration device of the ultrasonic water meter calibration apparatus in this embodiment mainly includes a setting module 11, an acquisition module 12, a determination module 13, and a traversal module 14. In some embodiments, one or more of the setting module 11, acquisition module 12, determination module 13, and traversal module 14 can be combined into one module.

[0113] In some embodiments, the setting module 11 can be configured to set a flow rate point to be verified and control the flow output component to output a stable water flow corresponding to the flow rate point to be verified.

[0114] The acquisition module 12 can be configured to acquire multiple instantaneous flow values ​​and flow reference values ​​of the flow meter under the stable water flow.

[0115] The determination module 13 can be configured to determine the verification result of the flow point to be verified based on multiple instantaneous flow values ​​and the flow reference value.

[0116] The traversal module 14 can be configured to traverse all flow points to be verified to complete the verification, and determine the overall verification result of the flow meter based on the verification results of all flow points to be verified.

[0117] In one implementation, a description of the specific function can be found in steps S10-S40.

[0118] The flow meter calibration device of the aforementioned ultrasonic water meter calibration apparatus is used for performing... Figure 2 The flowmeter calibration method embodiment of the ultrasonic water meter calibration device shown is similar in technical principle, technical problem solved and technical effect produced. Those skilled in the art can clearly understand that, for the sake of convenience and brevity, the specific working process and related instructions of the flowmeter calibration device of the ultrasonic water meter calibration device can be referred to the content described in the embodiment of the flowmeter calibration method of the ultrasonic water meter calibration device, and will not be repeated here.

[0119] Furthermore, it should be understood that since the various modules are only provided to illustrate the functional units of the device described in this application, the physical devices corresponding to these modules may be the processor itself, or a part of the processor's software, hardware, or a combination of both. Therefore, the number of modules shown in the figures is merely illustrative.

[0120] Those skilled in the art will understand that the various modules in the device can be adaptively split or combined. Such splitting or combining of specific modules will not cause the technical solution to deviate from the principles of this application; therefore, the technical solutions after splitting or combining will fall within the protection scope of this application.

[0121] Those skilled in the art will understand that all or part of the processes in the method of the above-described embodiment can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0122] Furthermore, this application also provides a computer-readable storage medium. In one embodiment of the computer-readable storage medium according to this application, the computer-readable storage medium can be configured to store a program for executing the flowmeter calibration method of the ultrasonic water meter calibration device described in the above-described method embodiments. This program can be loaded and run by a processor to implement the flowmeter calibration method of the ultrasonic water meter calibration device described above. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The computer-readable storage medium can be a memory device formed by various electronic devices. Optionally, in the embodiments of this application, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0123] The technical solution of this application has been described in conjunction with the specific embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A flowmeter calibration method for an ultrasonic water meter calibration device, characterized in that, include: The full flow range of the ultrasonic water meter calibration device is divided into a first flow range and a second flow range, wherein the first flow range is a flow range less than or equal to a preset flow threshold, and the second flow range is a flow range greater than the preset flow threshold. A flow rate point to be verified is set, and the flow output component is controlled to output a stable water flow corresponding to the flow rate point to be verified. The flow output component includes a first output component and a second output component. The flow meter acquires multiple instantaneous flow rates and flow reference values ​​under the stable water flow, including: When the flow point to be verified is located in the first flow range, a preset output flow value that matches the flow point to be verified is used as the flow reference value, and after the water flow output by the first output component stabilizes, multiple instantaneous flow values ​​under stable water flow are obtained from the flow meter. When the flow point to be verified belongs to the second flow range, and after the water flow output by the second output component stabilizes, multiple instantaneous flow values ​​under stable water flow are obtained from the flow meter, and the flow reference value is obtained through the weighing device; The step of obtaining the flow rate reference value through a weighing device includes: Control the commutator to commutate so that a stable water flow is directed to the weighing device; Obtain the cumulative water flow rate collected by the weighing device within a first preset time period; The traffic baseline value is determined based on the accumulated traffic and the first preset duration; The verification result of the flow point to be verified is determined based on multiple instantaneous flow values ​​and the flow reference value; The verification is completed by traversing all the flow points to be verified, and the overall verification result of the flow meter is determined based on the verification results of all the flow points to be verified.

2. The flow meter calibration method of the ultrasonic water meter calibration device according to claim 1, characterized in that, Determining the traffic benchmark value based on the accumulated traffic and the first preset duration includes: using the ratio of the accumulated traffic to the first preset duration as the traffic benchmark value.

3. The flow meter calibration method of the ultrasonic water meter calibration device according to claim 1, characterized in that, The step of determining the verification result of the flow point to be verified based on multiple instantaneous flow values ​​and the flow reference value includes: The average instantaneous flow rate is obtained based on multiple instantaneous flow rate values; The flow error is determined based on the instantaneous average flow rate and the flow rate reference value; Determine whether the flow error is less than a preset error threshold; If yes, then the verification result of the traffic point to be verified is qualified; otherwise, it is unqualified.

4. The flowmeter calibration method of the ultrasonic water meter calibration device according to claim 3, characterized in that, Before obtaining the average instantaneous flow rate based on multiple instantaneous flow rate values, the method further includes: Determine the difference between the instantaneous flow rate value and the average instantaneous flow rate value; Determine whether the absolute value of the difference is greater than a preset multiple of the standard deviation of the average instantaneous flow rates; If so, then the instantaneous flow rate value is discarded.

5. The flow meter calibration method of the ultrasonic water meter calibration device according to claim 1, characterized in that, The process of determining the overall verification result of the flow meter based on the verification results of all flow points to be verified includes: Determine the number of flow points that fail the verification among all flow points to be verified; Determine whether the number of traffic points that fail the verification is greater than a preset threshold. If so, the flow meter is deemed unqualified; otherwise, it is qualified.

6. The flow meter calibration method of the ultrasonic water meter calibration device according to claim 1, characterized in that, Before acquiring multiple instantaneous flow values ​​and flow reference values ​​of the flow meter under the stable water flow, the method further includes: opening a water flow of not less than a preset proportion of the maximum nominal flow of the ultrasonic water meter calibration device and continuing for a second preset duration to eliminate air bubbles in the pipeline of the ultrasonic water meter calibration device.

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