Ultrasonic water meter caliber detection method and device based on sound path model

Abstract

The application relates to the technical field of ultrasonic water meters, and particularly provides an ultrasonic water meter caliber detection method and detection device based on a sound path model, aiming to solve the problems of complex detection mode and low reliability of detection results of the existing ultrasonic water meter caliber detection method. For the purpose, the ultrasonic water meter caliber detection method based on the sound path model comprises the following steps: determining a sound path model of an ultrasonic water meter through actual test, wherein the sound path model reflects the mapping relationship between the caliber value of the ultrasonic water meter and the standard sound path value; in the production process of the ultrasonic water meter, an actual sound path value of a water meter to be detected is obtained; and whether the caliber of the water meter to be detected is qualified is determined according to the relative error between the actual sound path value and the standard sound path value corresponding to the caliber value in the sound path model. The application can save manpower and reduce the influence caused by human operation factors, measurement tool errors and the like, so that the reliability of the detection result can be improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ultrasonic water meters, and particularly provides an ultrasonic water meter caliber detection method and device based on a sound path model. BACKGROUND

[0002] An ultrasonic water meter can be divided into multiple types according to different calibers (the caliber values of a common ultrasonic water meter cover at least a range of DN15-DN40), the caliber value is associated with the cross-sectional area of the ultrasonic water meter, and different calibers of the ultrasonic water meter directly affect the measured water consumption, therefore, the precision value of the caliber of the ultrasonic water meter determines the measurement precision of the ultrasonic water meter.

[0003] Therefore, in the production process of the ultrasonic water meter, the caliber of the ultrasonic water meter needs to be detected to ensure that the precision of the water meter after leaving the factory is within a set range. At present, the caliber value of the ultrasonic water meter is measured mainly by using a mechanical ruler and other measuring tools. This method is not only complex in operation process and low in measurement efficiency, but also has a large measurement error due to human operation factors, and the reliability of the detection result is low.

[0004] Therefore, there is a need in the art for a new technical solution to solve the above problems. SUMMARY

[0005] The application aims to solve the above technical problems, i.e., to solve the problems of the complex detection method of the caliber of the existing ultrasonic water meter and the low reliability of the detection result.

[0006] In a first aspect, the application provides an ultrasonic water meter caliber detection method based on a sound path model, comprising:

[0007] determining a sound path model of the ultrasonic water meter through actual experiments, wherein the sound path model reflects the mapping relationship between the caliber value of the ultrasonic water meter and a standard sound path value;

[0008] in the production process of the ultrasonic water meter, obtaining an actual sound path value of a water meter to be detected;

[0009] determining whether the caliber of the water meter to be detected is qualified according to the relative error between the actual sound path value and the standard sound path value corresponding to the caliber value in the sound path model.

[0010] In one technical solution of the above ultrasonic water meter caliber detection method, the step of "determining a sound path model of the ultrasonic water meter through actual experiments" comprises:

[0011] providing multiple qualified ultrasonic water meters with the same caliber value as test samples;

[0012] measuring the sound path value of each test sample and calculating the average value as the standard sound path value of the ultrasonic water meter under the caliber value;

[0013] Replace qualified ultrasonic water meters of different diameters as test samples and repeat the above steps to obtain standard sound path values ​​for different diameters, thereby forming a sound path model.

[0014] In one technical solution of the above-mentioned ultrasonic water meter caliber detection method, the step of "measuring the acoustic path value of each of the test samples" includes:

[0015] The test sample is controlled to operate when it is filled with water;

[0016] Measure the uplink and downlink flight times of the sample under test;

[0017] Measure the current water temperature and determine the current speed of sound in the water based on the current water temperature;

[0018] The acoustic path value of the sample to be tested is determined based on the up-flight time, the down-flight time, and the current underwater sound speed.

[0019] In one technical solution of the above-mentioned ultrasonic water meter caliber detection method, the step of "determining the sound path value of the sample to be tested based on the up-flight time, the down-flight time, and the current sound velocity value in the water" includes:

[0020] Multiple sampling data are obtained by measuring the up-flight time, the down-flight time, and the current underwater sound speed value multiple times, and the average value of the multiple sampling data is calculated as the sound path value.

[0021] In one technical solution of the above-mentioned ultrasonic water meter caliber detection method, the step of "determining the sound path value of the sample to be tested based on the up-flight time, the down-flight time, and the current sound velocity value in the water" includes:

[0022] The acoustic path value of the sample to be tested is determined according to the following formula:

[0023] Where L is the sound path value of the sample to be tested, c is the current sound speed in water, t1 is the up-flight time, and t2 is the down-flight time.

[0024] In one technical solution of the above-mentioned ultrasonic water meter caliber detection method, the step of "controlling the operation of the test sample when the test sample is filled with water" includes:

[0025] The sample to be tested is installed on the test stand, and the test stand is controlled to run for a preset time to fill the sample with water.

[0026] In one technical solution of the above-mentioned ultrasonic water meter caliber detection method, the step of "controlling the operation of the test sample when the test sample is filled with water" further includes:

[0027] The test sample is controlled to run while the test sample is in a full tube of still water.

[0028] In one technical solution of the above-mentioned ultrasonic water meter caliber detection method, the step of "controlling the operation of the test sample when the test sample is filled with water" further includes:

[0029] Keep the water temperature on the meter reading station within the range of 15℃-25℃.

[0030] In one technical solution of the above-mentioned ultrasonic water meter diameter testing method, the step of "determining whether the diameter of the water meter under test is qualified based on the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model" includes:

[0031] When the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model is within a preset range, the diameter of the water meter to be inspected is determined to be qualified.

[0032] When the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model exceeds the preset range, the diameter of the water meter to be tested is determined to be unqualified.

[0033] In a second aspect, this application provides an ultrasonic water meter caliber detection device based on a sound path model, comprising:

[0034] The storage unit stores the sound path model of the ultrasonic water meter, which reflects the mapping relationship between the diameter value of the ultrasonic water meter and the standard sound path value.

[0035] The acquisition module is used to acquire the actual sound path value of the water meter under test.

[0036] The determination module determines whether the diameter of the water meter under test is qualified based on the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model.

[0037] By employing the above technical solution, this application uses the sound path value of the ultrasonic water meter as a reference value for caliber testing. By pre-establishing a sound path model of the ultrasonic water meter, the actual sound path value of the water meter under test is measured during the generation process. This actual sound path value is then combined with the pre-stored sound path model to determine whether the caliber of the water meter under test is qualified. Compared to existing technologies that rely on mechanical measuring tools to test caliber, the testing process of this application is simpler, saves manpower and resources, and reduces the impact of human operation factors and measuring tool errors, thereby improving the reliability of the test results. Attached Figure Description

[0038] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0039] Figure 1 This is a schematic diagram of the structure of an ultrasonic water meter in the prior art;

[0040] Figure 2 This is a flowchart of a method for constructing an acoustic path model of an ultrasonic water meter according to an embodiment of this application;

[0041] Figure 3 This is a flowchart of the main steps of an ultrasonic water meter diameter adaptive method according to an embodiment of the present application;

[0042] Figure 4 This is a detailed flowchart of the steps of an ultrasonic water meter diameter adaptive method according to an embodiment of this application;

[0043] Figure 5 This is a flowchart of an ultrasonic water meter caliber detection method based on a sound path model according to an embodiment of this application.

[0044] In the figure, the reference numerals refer to the following:

[0045] 1. Ultrasonic tube segment; 2. Upward reflector; 3. Downward reflector; 4. Upward transducer; 5. Downward transducer; 6. Temperature sensor. Detailed Implementation

[0046] Preferred 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. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0047] It should be noted that in the description of this application, terms such as "upper," "lower," "left," "right," "inner," and "outer," which indicate direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. These terms are used merely for ease of description and do not indicate or imply that the relevant device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] Reference Figure 1 This is a schematic diagram of a prior art ultrasonic water meter, which includes an ultrasonic tube section 1 and an upward reflector 2, a downward reflector 3, an upward transducer 4, a downward transducer 5, and a temperature sensor 6 disposed within the ultrasonic tube section 1. In one configuration, the metering chip of the ultrasonic water meter controls the upward transducer 4 to send an excitation signal. The excitation signal is reflected by the upward reflector 2 to the downward reflector 3, and then reflected again by the downward reflector 3 to the downward transducer 5. The downward transducer 5 receives a response signal, and simultaneously, the metering chip measures the time of flight. During this process, the sound path traversed by the signal from transmission to reception is L1+L2+L3. The temperature sensor 6 is used to detect the temperature of the water flowing through the ultrasonic tube section 1, thereby calculating the speed of sound in the water.

[0050] To facilitate the description of the technical solution of this application, the arrows in the figure indicate the direction of water flow. The time required for the signal to be sent and received along the downstream direction is called the upflow time t1, and the time required for the signal to be sent and received along the upstream direction is called the downflow time t2. The volumetric flow rate of the water meter can be calculated based on the time difference between t2 and t1, the water meter diameter, the sound path, the cross-sectional area of ​​the ultrasonic pipe section 1, and other geometric parameters. Of course, the structure and metering principle of the ultrasonic water meter described above are well-known technologies in this field, and this application will not elaborate further on them here.

[0051] This application aims to use the sound path of an ultrasonic water meter as a reference condition for caliber identification. Therefore, this application first proposes a method for measuring the sound path of an ultrasonic water meter, as follows:

[0052] After the main structure of the ultrasonic water meter is manufactured, it is installed on the meter testing platform. The platform is controlled to ensure the ultrasonic water meter is in a full-pipe clean water state. Then, the ultrasonic metering chip sends an excitation signal to the upward transducer 4 according to a set cycle. The signal passes sequentially through the upward reflector 2 (L1) and the downward reflector 3 (L2) before reaching the downward transducer 5 (L3). The downward transducer 5 receives a response signal, and during this process, the ultrasonic metering chip measures the upward flight time t1. Conversely, the ultrasonic metering chip sends an excitation signal to the downward transducer 5, senses the response signal of the upward transducer 4, and measures the downward flight time t2. The flight time is then calculated. .

[0053] During each of the above measurements, temperature sensor 6 collects the water temperature T in real time and calculates it according to the Del Grosso formula:

[0054]

[0055] The speed of sound in water, c, at the current temperature is calculated (the Del Grosso formula described above characterizes the functional relationship between the speed of sound c and the water temperature T, mainly considering the influence of the water temperature T on the speed of sound Cd in water, which is an existing formula in this field).

[0056] Using the aforementioned flight time t and the calculated speed of sound c, combined with the formula:

[0057]

[0058] The sound path L of the ultrasonic water meter can be calculated.

[0059] Through experimentation, the inventors discovered that for ultrasonic water meters of the same diameter, the measurement error of the sound path L is within 10%. This error arises from the precision of actual manufacturing and is related to factors such as the machining accuracy of components and assembly tolerances. However, for ultrasonic water meters of different diameters, the difference in sound path L between two adjacent diameters is generally over 30%. Based on this, the inventors believe that there is a positive correlation between the sound path L and the diameter value. Therefore, the inventors conclude that the diameter value of an ultrasonic water meter can be determined by measuring the sound path L.

[0060] As mentioned above, for ultrasonic water meters of the same diameter, the sound path values ​​measured by different water meters with the same diameter will also differ due to factors such as processing accuracy and assembly tolerance. Therefore, a sound path model of ultrasonic water meters can be constructed through actual experiments. This sound path model reflects the mapping relationship between the diameter value of ultrasonic water meters and the standard sound path value, that is, L=f(DNx).

[0061] Reference Figure 2 The following describes the method for constructing the sound path model of an ultrasonic water meter. The sound path model is determined through actual experiments. The specific steps of "determining the sound path model of an ultrasonic water meter through actual experiments" include:

[0062] S101: Provide multiple qualified ultrasonic water meters with the same diameter as samples to be tested.

[0063] In step S101 above, a qualified ultrasonic water meter refers to a product that has passed quality inspection, and the number of qualified ultrasonic water meters selected is greater than or equal to 10. For example, 20 qualified ultrasonic water meters of model DN15 are selected as samples to be tested.

[0064] S102: Measure the sound path value of each sample to be tested and calculate the average value as the standard sound path value of the ultrasonic water meter at this diameter.

[0065] Specifically, step S102 may include:

[0066] S1021: Control the operation of the test sample when the test sample is filled with water.

[0067] In the embodiments of this application, the aforementioned "the sample to be tested is filled with water" can be "the sample to be tested is in a state of full tube clean water". For example, in specific operation, the sample to be tested can be installed on the test stand, and the test stand can be controlled to run for a preset time and then stop, ensuring that the ultrasonic tube section of the sample to be tested is in a state of full tube clean water. This is because only when the ultrasonic tube section of the sample to be tested is filled with water can the signal pass entirely through the water, thereby ensuring the accuracy of the measurement.

[0068] Optionally, in step S1021, the water temperature of the test bench is controlled to keep it within the range of 15℃-25℃.

[0069] S1022: Measure the upflight time of the sample under test. and downlink flight time .

[0070] S1023: Measure the current water temperature and determine the current speed of sound in the water, c, based on the current water temperature.

[0071] S1024: Based on uphill flight time Downlink flight time And the current sound velocity c in the water determines the sound path value of the sample to be tested. .

[0072] In some embodiments, in step S1024, multiple sampling data can be obtained by repeatedly measuring the uplink flight time, downlink flight time, and the current sound velocity in the water, and the average value of the multiple sampling data can be calculated as the sound path value. For example, the ultrasonic metering chip reads the uplink flight time and downlink flight time every few seconds and measures the current water temperature to calculate a sampling data. By averaging multiple sampling data, the accuracy of the sound path value of a single sample can be improved, so as to minimize the impact of factors such as temperature fluctuations, water flow conditions, and signal stability on the measurement results.

[0073] Steps S1021-S1024 are the steps for measuring the sound path value of a single sample to be tested. The sound path values ​​of 20 samples to be tested are measured respectively, and then the average value is calculated. At this time, the average value is the standard sound path value of the ultrasonic water meter under this diameter value.

[0074] S103: Replace qualified ultrasonic water meters of different diameters as test samples and repeat the above steps to obtain standard sound path values ​​under different diameter values, thereby forming a sound path model.

[0075] For example, in steps S101-102, the standard sound path value of the ultrasonic water meter with model number DN15 was measured. In step S103, the standard sound path value corresponding to the ultrasonic water meters with different diameters such as DN20, DN25, etc. was measured respectively.

[0076] In the actual production process of ultrasonic water meters, the above-mentioned sound path model is stored in the storage unit of the ultrasonic water meter, and when the processor program is burned during production, it is also burned into the processor of the ultrasonic water meter circuit board.

[0077] Reference Figure 3 and Figure 4 , Figure 3 This is a flowchart illustrating the main steps of an ultrasonic water meter diameter adaptive method according to an embodiment of this application. Figure 4 The flowchart below shows the detailed steps of an ultrasonic water meter diameter adaptation method according to an embodiment of this application. The ultrasonic water meter diameter adaptation method includes:

[0078] S201: Obtain the actual sound path value of the target water meter.

[0079] The target water meter refers to the ultrasonic water meter whose main structure has been completed but has not yet been officially shipped during the production process. Before step S201, the target water meter has been installed on the meter testing platform and established a communication connection with the host computer. Then, the host computer sends a command to the target water meter to start executing the caliber adaptive method.

[0080] Specifically, step S201 includes:

[0081] S2011: Control the operation of the target water meter when it is full of water.

[0082] Similarly, in this step, the meter testing platform is adjusted to control the water temperature within the range of 15℃-25℃, and to ensure that the ultrasonic pipe section of the target water meter is in a state of full pipe still water.

[0083] S2012: Measure the up-flight time and down-flight time of the target water meter.

[0084] S2013: Measure the current water temperature and determine the speed of sound in the water based on the current water temperature.

[0085] S2014: Determine the actual sound path value of the target water meter based on the up-flight time, down-flight time, and the sound speed in water.

[0086] Similarly, in step 2014, multiple sampling data can be obtained by repeatedly measuring the uplink flight time, downlink flight time, and the current sound velocity in the water. The average of these multiple sampling data is then calculated as the actual sound path value of the target water meter. For example, the ultrasonic metering chip reads the uplink flight time and downlink flight time every few seconds and measures the current water temperature to calculate a single sampling data point. By averaging multiple sampling data points, the accuracy of the actual sound path value measurement of the target water meter is improved, thereby minimizing the impact of factors such as temperature fluctuations, water flow conditions, and signal stability on the measurement results.

[0087] The above measurement steps are basically the same as the aforementioned steps S1021-S1024, and will not be repeated here.

[0088] S202: Compare the actual sound path value with the standard sound path values ​​corresponding to different aperture values ​​in the sound path model.

[0089] In step S202, the actual sound path value of the target water meter needs to be compared with the standard sound path value corresponding to all diameter values ​​in the sound path model.

[0090] S203: Determine the diameter of the target water meter based on the comparison results.

[0091] In some embodiments of this application, step S203 may specifically include:

[0092] S2031: Obtain the relative error Re between the actual sound path value and each standard sound path value.

[0093] in,

[0094] S2032: Determine the diameter of the target water meter based on the relative error.

[0095] In the first implementation, step S2032 can be: determining the standard sound path value corresponding to the minimum relative error, and using the diameter value corresponding to the standard sound path value as the diameter of the target water meter. For example, after determining multiple relative errors between the actual sound path value and each standard sound path value through step S2031, it is found that the minimum relative error Re is 2%, and the diameter value corresponding to the minimum Re value is DN20. Therefore, the diameter of the target water meter is determined to be DN20.

[0096] In the first implementation, step S2032 can be:

[0097] Determine whether the minimum value of the relative error is within the preset error range.

[0098] When the minimum relative error is within the preset error range, the standard sound path value corresponding to the minimum relative error is determined, and the diameter value corresponding to the standard sound path value is used as the diameter of the target water meter.

[0099] It should be noted that the specific range of the above-mentioned "preset error range" can be determined according to actual needs. For example, in one embodiment of this application, the preset error range is 10%. After determining the multiple relative errors between the actual sound path value and each standard sound path value through step S2031, it is found that the minimum value of the relative error Re is 2%, and Re≤10%, which meets the above requirements. At this time, the diameter value corresponding to the minimum Re value is DN25, so the diameter of the target water meter is determined to be DN25.

[0100] When the minimum relative error exceeds the preset error range, the target water meter is deemed unqualified.

[0101] For example, after determining the multiple relative errors between the actual sound path value and each standard sound path value through step S2031, it is found that the minimum value of the relative error Re is 12%, and Re > 10%. At this time, the diameter value corresponding to the minimum Re value is DN32. However, since the relative error between the actual sound path value and the corresponding standard sound path value is too large, it is determined that it is caused by the machining accuracy and / or assembly tolerance, which does not meet the quality requirements of the ultrasonic water meter. Therefore, the target water meter is determined to be unqualified at this time.

[0102] As can be seen, the difference between the second method and the first method is that an additional judgment step is added to detect whether the target water meter meets the quality requirements. That is, after determining the minimum value Re of the relative error, it is also necessary to determine that Re does not exceed the preset error range.

[0103] After determining the diameter of the target water meter in step S203, the diameter information is sent to the host computer and imported into the storage unit of the target water meter, thereby achieving diameter matching.

[0104] As described above, this application pre-collects the acoustic path model of the ultrasonic water meter. During the processor development process, this acoustic path model is directly stored in the processor's storage unit. When manufacturing the circuit board, there's no need to consider the diameter; the program can be directly burned into the processor. Based on this, during the production process, each ultrasonic water meter is equipped with the aforementioned circuit board. Before the ultrasonic water meter is initially processed and shipped, the actual acoustic path value is detected, and this value is compared with the stored acoustic path model to determine the meter's diameter information. Finally, this diameter information is imported into the ultrasonic water meter to achieve adaptive diameter matching. Thus, with this solution, the same program can be burned during circuit board production, allowing ultrasonic water meters of different diameters to share the same circuit board. Before the ultrasonic water meter leaves the factory, only the acoustic path value needs to be measured for adaptive diameter matching to bind the diameter information to the corresponding program. This eliminates the need to issue configuration parameters separately for each ultrasonic water meter, improving production efficiency, reducing production costs, and decreasing the probability of errors.

[0105] Furthermore, when using the above-mentioned technical solution of this application, different ultrasonic water meters share the same set of programs on the same circuit board. When performing program maintenance in actual product applications, only the program needs to be maintained, which not only reduces the maintenance workload but also reduces the probability of errors in maintenance operations.

[0106] This application also discloses a control device including a processor and a storage unit. The storage unit stores the aforementioned sound path model and can be configured to store a program for executing the aperture adaptation method of any of the above method embodiments. The processor can be configured to execute the program in the storage unit, which includes, but is not limited to, a program for executing the aperture adaptation method described in the above method embodiments. In some embodiments of this application, the control device may be a control device device comprising various electronic devices.

[0107] Furthermore, this application also discloses an ultrasonic water meter, which includes the control device described in the above embodiments.

[0108] The inventors discovered that, based on the relationship between the diameter of the ultrasonic water meter and the sound path model, the sound path model can also be used in other applications, such as for quality inspection and calibration of ultrasonic water meters. Based on this, this application also discloses a method for detecting the diameter of an ultrasonic water meter based on the sound path model.

[0109] Reference Figure 5 Here is a flowchart of an ultrasonic water meter caliber detection method based on a sound path model according to an embodiment of this application, which includes:

[0110] S301: Determine the sound path model of the ultrasonic water meter through actual experiments.

[0111] S302: During the production process of ultrasonic water meters, obtain the actual sound path value of the water meter to be tested.

[0112] S303: Determine whether the diameter of the water meter under test is qualified based on the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model.

[0113] In one embodiment, step S303 specifically includes:

[0114] Determine whether the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding aperture value in the sound path model is within the preset range.

[0115] When the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model is within the preset range, the diameter of the water meter to be inspected is determined to be qualified.

[0116] When the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model exceeds the preset range, the diameter of the water meter to be inspected is determined to be unqualified.

[0117] It should be noted that, The preset range can be determined according to actual needs. The smaller the preset range, the higher the accuracy, indicating a more stringent requirement for the diameter. For example, the preset range can be 5%.

[0118] For example, if a batch of ultrasonic water meters with model number DN32 is processed in actual production, which is the "water meter to be inspected" mentioned above, the actual sound path value of the batch of water meters to be inspected is obtained through step S302. Then, the actual sound path value is compared with the standard sound path value corresponding to DN32 in the sound path model. When the relative error between the two is less than 5% (i.e., the relative error is within ±5%), it is determined that the diameter of the water meter to be inspected is qualified and meets the product factory requirements; otherwise, it is determined that the diameter of the water meter to be inspected is unqualified.

[0119] As described above, this application uses the sound path value of an ultrasonic water meter as a reference value for caliber testing. By pre-establishing a sound path model of the ultrasonic water meter, the actual sound path value of the water meter under test is measured during the generation process of the ultrasonic water meter. The actual sound path value is then combined with the pre-stored sound path model to determine whether the caliber of the water meter under test is qualified. Compared with the existing technology that relies on mechanical measuring tools to test caliber, the testing process of this application is simpler, saves manpower and resources, and reduces the impact of human operation factors and measuring tool errors, thereby improving the reliability of the test results.

[0120] This application also discloses an ultrasonic water meter caliber detection device based on a sound path model, comprising a storage unit, an acquisition module, and a determination module. The storage unit stores a sound path model of the ultrasonic water meter, which reflects the mapping relationship between the caliber value of the ultrasonic water meter and a standard sound path value. The acquisition module acquires the actual sound path value of the water meter under test. The determination module determines whether the caliber of the water meter under test is qualified based on the relative error between the actual sound path value and the standard sound path value corresponding to the caliber value in the sound path model. In some embodiments, the acquisition module and the determination module can be combined into a single module.

[0121] The technical solutions of this application have been described above with reference to the preferred 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 method for detecting the diameter of an ultrasonic water meter based on a sound path model, characterized in that, include: The sound path model of the ultrasonic water meter was determined through actual experiments. The sound path model reflects the mapping relationship between the diameter value of the ultrasonic water meter and the standard sound path value. During the production process of ultrasonic water meters, the actual sound path value of the water meter under test is obtained; The caliber of the water meter under test is determined based on the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding caliber value in the sound path model. The steps for "determining the sound path model of an ultrasonic water meter through actual experiments" include: Provide multiple qualified ultrasonic water meters with the same diameter as samples to be tested; The sound path value of each of the test samples is measured and the average value is calculated as the standard sound path value of the ultrasonic water meter at that diameter. Replace qualified ultrasonic water meters with different diameter values ​​as test samples and repeat the above steps to obtain standard sound path values ​​under different diameter values, thereby forming a sound path model. The steps of "measuring the acoustic path value of each of the test samples" include: The test sample is controlled to operate when it is filled with water; Measure the uplink and downlink flight times of the sample under test; Measure the current water temperature and determine the current speed of sound in the water based on the current water temperature; The acoustic path value of the sample to be tested is determined based on the up-flight time, the down-flight time, and the current underwater sound speed.

2. The ultrasonic water meter diameter detection method according to claim 1, characterized in that, The step of "determining the sound path value of the sample to be tested based on the up-flight time, the down-flight time, and the current sound speed in water" includes: Multiple sampling data are obtained by measuring the up-flight time, the down-flight time, and the current underwater sound speed value multiple times, and the average value of the multiple sampling data is calculated as the sound path value.

3. The ultrasonic water meter diameter detection method according to claim 1, characterized in that, The step of "determining the sound path value of the sample to be tested based on the up-flight time, the down-flight time, and the current sound speed in water" includes: The acoustic path value of the sample to be tested is determined according to the following formula: Where L is the sound path value of the sample to be tested, c is the current sound speed in water, t1 is the up-flight time, and t2 is the down-flight time.

4. The ultrasonic water meter diameter detection method according to claim 1, characterized in that, The steps of "controlling the operation of the test sample while it is filled with water" include: The sample to be tested is installed on the test stand, and the test stand is controlled to run for a preset time to fill the sample with water.

5. The ultrasonic water meter diameter detection method according to claim 4, characterized in that, The step of "controlling the operation of the test sample while it is filled with water" also includes: The test sample is controlled to run while the test sample is in a full tube of still water.

6. The ultrasonic water meter diameter detection method according to claim 4, characterized in that, The step of "controlling the operation of the test sample while it is filled with water" also includes: Keep the water temperature on the meter reading station within the range of 15℃-25℃.

7. The ultrasonic water meter diameter detection method according to claim 1, characterized in that, The step of "determining whether the diameter of the water meter under test is qualified based on the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model" includes: When the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model is within a preset range, the diameter of the water meter to be inspected is determined to be qualified. When the relative error between the actual sound path value and the standard sound path value corresponding to the corresponding diameter value in the sound path model exceeds the preset range, the diameter of the water meter to be tested is determined to be unqualified.

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