Anti-interference detection method and system for ultrasonic gas meter

Abstract

The present application relates to an anti-interference detection method and system for an ultrasonic gas meter, the method comprising: obtaining a first operating frequency of a gas meter to be detected, obtaining a second operating frequency of a calibrated gas flow standard device, the first operating frequency being different from the second operating frequency; applying a first vibration frequency to the gas meter to be detected and the gas flow standard device that are working at the same time and located in the same pipeline, obtaining a first test reading of the gas meter to be detected and a first reference reading of the gas flow standard device; wherein the difference between the first vibration frequency and the first operating frequency is less than a preset first difference, and the difference between the first vibration frequency and the second operating frequency is greater than a preset second difference; calculating the difference between the first test reading and the first reference reading to obtain a first error value. The present application can measure the error generated by an ultrasonic gas meter when the external vibration frequency is the same as the operating frequency of the ultrasonic transducer built into the ultrasonic gas meter.

Description

Technical Field

[0001] The present application relates to the field of ultrasonic gas meters, and in particular to an anti-interference detection method and system for ultrasonic gas meters. Background Art

[0002] Natural gas is a natural clean energy. With the country's vigorous development of natural gas, natural gas has become popular. Existing gas meters generally refer to natural gas meters, and the commonly used method is to measure through gas flow meters.

[0003] An ultrasonic gas meter is a type of gas flow meter that uses the transit time method to measure gas flow velocity. This method measures the velocity of the fluid by measuring the difference in the velocity of the ultrasonic signal as it propagates downstream and upstream. Because the transit time method minimizes the error caused by changes in sound velocity with fluid temperature, it offers high accuracy and is currently widely used.

[0004] However, when ultrasonic gas meters are actually used, mechanical wave noise in the external environment will be transmitted to the ultrasonic gas meter through vibration. In particular, when external equipment cuts the gas pipeline during construction or decoration on the gas pipeline, the gas pipeline will generate high-frequency vibration during the cutting process. This high-frequency vibration will propagate along the gas pipeline. When the vibration frequency is the same as the operating frequency of the built-in ultrasonic transducer of the ultrasonic gas meter, it will affect the metering accuracy of the meter. Summary of the Invention

[0005] In order to measure the error generated by an ultrasonic gas meter when the external vibration frequency is the same as the operating frequency of the ultrasonic transducer built into the ultrasonic gas meter, the present application provides an anti-interference detection method and system for an ultrasonic gas meter.

[0006] In a first aspect, the present application provides an anti-interference detection method for an ultrasonic gas meter, which adopts the following technical solution:

[0007] An anti-interference detection method for an ultrasonic gas meter comprises the following steps:

[0008] Acquire a first operating frequency of the gas meter to be tested, and acquire a second operating frequency of a calibrated gas flow standard device, wherein the first operating frequency is different from the second operating frequency;

[0009] Applying a first vibration frequency to the gas meter to be tested and the gas flow standard device, which are operating simultaneously and located in the same pipeline, to obtain a first test reading of the gas meter to be tested and a first reference reading of the gas flow standard device; wherein the difference between the first vibration frequency and the first operating frequency is less than a preset first difference, and the difference between the first vibration frequency and the second operating frequency is greater than a preset second difference;

[0010] Furthermore, a difference between the first test reading and the first reference reading is calculated to obtain a first error value.

[0011] By adopting the above technical solution, a gas flow standard device with a working frequency different from that of the gas meter to be tested is used as a reference. The gas flow standard device has been calibrated and is therefore more accurate. When the first vibration frequency that can affect the gas meter to be tested is not used, the gas meter to be tested and the gas flow standard device are compared while working at the same time and located in the same pipeline to correct the reading of the gas meter to be tested; when the first vibration frequency that can affect the gas meter to be tested is used, the gas meter to be tested will have deviations, and the first vibration frequency has little effect on the gas flow standard device. Therefore, the first error value calculated between the first test reading and the first reference reading can represent the error generated by the gas meter to be tested when the external vibration frequency is the same as the working frequency of the ultrasonic transducer built into the ultrasonic gas meter.

[0012] Preferably, the method further comprises:

[0013] Applying a second vibration frequency to the gas meter to be tested and the gas flow standard device, which are operating simultaneously and located in the same pipeline, to obtain a second test reading of the gas meter to be tested and a second reference reading of the gas flow standard device; wherein the difference between the second vibration frequency and the first operating frequency is greater than a preset third difference, and the difference between the second vibration frequency and the second operating frequency is less than a preset fourth difference;

[0014] Furthermore, a difference between the second test reading and the second reference reading is calculated to obtain a second error value, and the difference between the first error value and the second error value is taken as a comparison error value.

[0015] By adopting the above technical solution, when using the second vibration frequency that can affect the gas flow standard device, the deviation of the gas meter to be tested is small, and the second vibration frequency has a great influence on the gas flow standard device. Therefore, the second error value calculated by the second test reading and the second reference reading can represent the error generated by the gas flow standard device when the external vibration frequency is the same as the working frequency of the built-in ultrasonic transducer of the ultrasonic gas meter. The comparison error value can correspond to the error degree of the gas meter to be tested. If the error of the gas meter to be tested itself is not large, the error degree will be small. If the error of the gas meter to be tested itself is large, the error between the gas meter to be tested and the gas flow standard device will be large, which will make the error degree larger.

[0016] Preferably, the method further comprises:

[0017] Setting a flow field interference in the pipeline between the gas meter to be tested and the gas flow standard device, obtaining a first flow field reading of the gas meter to be tested after being subjected to the flow field interference and a second flow field reading of the gas flow standard device after not being subjected to the flow field interference;

[0018] Furthermore, a flow field error value is obtained by calculating a difference between the first flow field reading and the second flow field reading.

[0019] By adopting the above technical solution, when testing external vibration frequency interference, the flow field interference of the gas is added, so that the error value of the gas meter to be tested can be further amplified, and then it can be known whether the error value of the gas meter to be tested is a simple addition of the error of the vibration frequency interference and the error of the flow field interference. If it is much larger than the simple addition of the two, it means that the anti-interference performance of the gas meter to be tested is weak.

[0020] Preferably, the method further comprises:

[0021] Setting a pulsation interference at the flow field interference location, obtaining a first pulsation reading of the gas meter to be tested after being subjected to the pulsation interference and a second pulsation reading of the gas flow standard device after not being subjected to the pulsation interference;

[0022] Furthermore, a difference between the first pulsation reading and the second pulsation reading is calculated to obtain a pulsation error value.

[0023] By adopting the above technical solution, when testing external vibration frequency interference, the pulsation interference of gas is added, so that the error value of the gas meter to be tested can be further amplified, and then it can be known whether the error value of the gas meter to be tested is a simple addition of the error of the vibration frequency interference and the error of the pulsation interference. If it is much larger than the simple addition of the two, it means that the anti-interference performance of the gas meter to be tested is weak.

[0024] Preferably, the method further comprises:

[0025] Setting an electromagnetic interference in a pipeline between the gas meter to be detected and the gas flow standard device, obtaining a first electromagnetic reading of the gas meter to be detected after being subjected to the electromagnetic interference and a second electromagnetic reading of the gas flow standard device after not being subjected to the electromagnetic interference;

[0026] Furthermore, a difference between the first electromagnetic reading and the second electromagnetic reading is calculated to obtain a magnetic field error value.

[0027] By adopting the above technical solution, when testing external vibration frequency interference, the electromagnetic interference of gas is added, so that the error value of the gas meter to be tested can be further amplified, and then it can be known whether the error value of the gas meter to be tested is a simple addition of the error of the vibration frequency interference and the error of the electromagnetic interference. If it is much larger than the simple addition of the two, it means that the anti-interference performance of the gas meter to be tested is weak.

[0028] In a second aspect, the present application provides an anti-interference detection system for an ultrasonic gas meter, which adopts the following technical solutions:

[0029] An anti-interference detection system for an ultrasonic gas meter includes the following modules:

[0030] an acquisition module, configured to acquire a first operating frequency of the gas meter to be detected and a second operating frequency of a calibrated gas flow standard device, wherein the first operating frequency is different from the second operating frequency;

[0031] Ultrasonic transducers for emitting mechanical wave noise in different frequency ranges;

[0032] a first control module, electrically connected to the acquisition module and the ultrasonic transducer, and configured to control the ultrasonic transducer to apply a first vibration frequency to the gas meter to be tested and the gas flow standard device, which are operating simultaneously and located in the same pipeline, to obtain a first test reading of the gas meter to be tested and a first reference reading of the gas flow standard device; wherein the difference between the first vibration frequency and the first operating frequency is less than a preset first difference, and the difference between the first vibration frequency and the second operating frequency is greater than a preset second difference;

[0033] And, a first calculation module is electrically connected to the control module, and is used to obtain the first test reading and the first reference reading and calculate the difference to obtain a first error value.

[0034] By adopting the above technical solution, the acquisition module uses a gas flow standard device with a working frequency different from the working frequency of the gas meter to be detected as a reference. The gas flow standard device has been calibrated and is relatively accurate. When the first control module does not use the first vibration frequency that can affect the gas meter to be detected, the gas meter to be detected and the gas flow standard device are compared when they work at the same time and are located in the same pipeline to correct the reading of the gas meter to be detected; when the first control module uses the first vibration frequency that can affect the gas meter to be detected, the gas meter to be detected will have deviations, and the first vibration frequency has little effect on the gas flow standard device. Therefore, the first error value calculated by the first calculation module between the first test reading and the first reference reading can represent the error generated by the gas meter to be detected when the external vibration frequency is the same as the working frequency of the ultrasonic transducer built into the ultrasonic gas meter.

[0035] Preferably, the system further comprises:

[0036] a second control module, electrically connected to the acquisition module and the ultrasonic transducer, and configured to control the ultrasonic transducer to apply a second vibration frequency to the gas meter to be tested and the gas flow standard device, which are operating simultaneously and located in the same pipeline, to obtain a second test reading of the gas meter to be tested and a second reference reading of the gas flow standard device; wherein a difference between the second vibration frequency and the first operating frequency is greater than a preset third difference, and a difference between the second vibration frequency and the second operating frequency is less than a preset fourth difference;

[0037] And, a second calculation module is electrically connected to the first calculation module and the second control module, and is used to obtain the second test reading, the second reference reading and the first error value, calculate the difference between the second test reading and the second reference reading to obtain a second error value, and take the difference between the first error value and the second error value as a comparison error value.

[0038] By adopting the above technical solution, when the second control module controls the ultrasonic transducer to use the second vibration frequency that can affect the gas flow standard device, the deviation of the gas meter to be tested is small, and the second vibration frequency has a great influence on the gas flow standard device. Therefore, the second error value calculated by the second calculation module using the second test reading and the second reference reading can represent the error generated by the gas flow standard device when the external vibration frequency is the same as the working frequency of the ultrasonic transducer built into the ultrasonic gas meter. The comparison error value can correspond to the error degree of the gas meter to be tested. If the error of the gas meter to be tested itself is not large, the error degree will be small. If the error of the gas meter to be tested itself is large, the error between the gas meter to be tested and the gas flow standard device will be large, which will make the error degree larger.

[0039] Preferably, the system further comprises:

[0040] A flow field disruptor, comprising a gas branch with a built-in spoiler and / or an elbow, wherein the gas branch is connected in parallel to the pipeline between the gas meter to be tested and the gas flow standard device through a reversing valve;

[0041] a third control module, electrically connected to the flow field disruptor, for controlling the flow field disruptor to be connected to the pipeline between the gas meter to be tested and the gas flow standard device to form flow field interference, and obtaining a first flow field reading of the gas meter to be tested after the flow field interference and a second flow field reading of the gas flow standard device after the flow field interference is not caused;

[0042] And, a third calculation module is electrically connected to the third control module, and is used to calculate the difference between the first flow field reading and the second flow field reading to obtain a flow field error value.

[0043] By adopting the above technical solution, when testing external vibration frequency interference, the third control module controls the flow field interference imposed on the gas by the flow field disruptor, thereby further amplifying the error value of the gas meter to be tested. The third calculation module can calculate whether the error value of the gas meter to be tested is a simple addition of the error of the vibration frequency interference and the error of the flow field interference. If it is much larger than the simple addition of the two, it means that the anti-interference performance of the gas meter to be tested is weak.

[0044] Preferably, the system further comprises:

[0045] A pulsation disruptor, comprising a built-in gas branch for generating pulsating flow, wherein the gas branch is connected in parallel to the pipeline between the gas meter to be tested and the gas flow standard device through a reversing valve;

[0046] a fourth control module, electrically connected to the pulsation disruptor, configured to control the pulsation disruptor to be connected to the pipeline between the gas meter to be tested and the gas flow standard device to generate pulsation interference, and obtain a first pulsation reading of the gas meter to be tested after being subjected to the pulsation interference and a second pulsation reading of the gas flow standard device after being free from the pulsation interference;

[0047] And, a fourth calculation module is electrically connected to the fourth control module, and is used to calculate the difference between the first pulsation reading and the second pulsation reading to obtain a pulsation error value.

[0048] By adopting the above technical solution, when testing external vibration frequency interference, the fourth control module controls the pulsation interference applied to the gas by the pulsation interferer, thereby further amplifying the error value of the gas meter to be tested. The fourth calculation module can calculate whether the error value of the gas meter to be tested is a simple addition of the error of the vibration frequency interference and the error of the pulsation interference. If it is much larger than the simple addition of the two, it means that the anti-interference performance of the gas meter to be tested is weak.

[0049] Preferably, the system further comprises:

[0050] A magnetic field generator, used to generate the required magnetic field interference signal and / or electric field interference signal;

[0051] a fifth control module, electrically connected to the magnetic field generator, configured to control the magnetic field generator to set electromagnetic interference in the pipeline between the gas meter to be tested and the gas flow standard device, and obtain a first electromagnetic reading of the gas meter to be tested after being subjected to the electromagnetic interference and a second electromagnetic reading of the gas flow standard device after being free from the electromagnetic interference;

[0052] And, a fifth calculation module is electrically connected to the fifth control module, and is used to calculate the difference between the first electromagnetic reading and the second electromagnetic reading to obtain a magnetic field error value.

[0053] By adopting the above technical solution, when testing external vibration frequency interference, the fifth control module controls the electromagnetic interference applied to the gas by the magnetic field generator, thereby further amplifying the error value of the gas meter to be tested. The fifth calculation module can determine whether the error value of the gas meter to be tested is a simple addition of the error of the vibration frequency interference and the error of the electromagnetic interference. If it is much larger than the simple addition of the two, it means that the anti-interference performance of the gas meter to be tested is weak. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a flow chart of a method according to an embodiment of the present application;

[0055] Figure 2 It is a system control block diagram of an embodiment of the present application.

[0056] Figure numerals: 1. Intelligent test bench; 2. Gas meter to be tested; 3. Gas flow standard device; 4. Acquisition module; 5. Ultrasonic transducer; 6. Flow field disruptor; 7. Pulsation disruptor; 8. Magnetic field generator; 9. First control module; 10. First calculation module; 11. Second control module; 12. Second calculation module; 13. Third control module; 14. Third calculation module; 15. Fourth control module; 16. Fourth calculation module; 17. Fifth control module; 18. Fifth calculation module. DETAILED DESCRIPTION

[0057] The following is combined with Figure 1-2 This application is described in further detail.

[0058] The embodiment of the present application discloses an anti-interference detection method for an ultrasonic gas meter. Figure 1 and Figure 2 , an anti-interference detection method for an ultrasonic gas meter, comprising the following steps:

[0059] The intelligent test bench 1 obtains the first operating frequency of the gas meter 2 to be tested, and obtains the second operating frequency of the calibrated gas flow standard device 3, where the first operating frequency is different from the second operating frequency. The intelligent test bench 1 is an intelligent test bench or intelligent terminal containing computing units such as MCU, PLC or FPGA. The gas meter 2 to be tested is an ultrasonic gas meter waiting to be tested, and the first operating frequency of the gas meter 2 to be tested is the operating frequency of the ultrasonic transducer 5 built into the ultrasonic gas meter. The gas flow standard device 3 can use professional testing equipment or a calibrated ultrasonic gas meter, whose readings and error parameters under various harsh environments meet the requirements and have been recorded. In this embodiment, the gas flow standard device 3 uses a calibrated ultrasonic gas meter, and the second operating frequency of the gas flow standard device 3 is the operating frequency of the ultrasonic transducer 5 built into the ultrasonic gas meter. For example, the first operating frequency may be 500 kHz, and the second operating frequency may be 525 kHz. The 500 kHz ultrasonic transducer 5 responds to received sound waves of 500 kHz but not to received sound waves of 525 kHz; the 525 kHz ultrasonic transducer 5 responds to received sound waves of 525 kHz but not to received sound waves of 500 kHz. During detection, the ultrasonic transducer 5 may be used to emit mechanical wave noise of a desired frequency.

[0060] The intelligent test bench 1 controls the ultrasonic transducer 5 to emit mechanical wave noise at a first vibration frequency, which can be 500 kHz. The ultrasonic transducer 5 applies the first vibration frequency to the gas meter 2 to be tested and the gas flow standard device 3, which are operating simultaneously and located in the same pipeline, to obtain a first test reading of the gas meter 2 to be tested and a first reference reading of the gas flow standard device 3. The difference between the first vibration frequency and the first operating frequency is less than a preset first difference, and the difference between the first vibration frequency and the second operating frequency is greater than a preset second difference. The gas meter 2 to be tested and the gas flow standard device 3 to be tested are connected to the same test gas pipeline, with the gas flow standard device 3 located upstream of the gas meter 2 to facilitate the addition of additional test items between the gas flow standard device 3 and the gas meter 2 to be tested. The gas flow in the gas pipeline is controlled by a gas solenoid valve, which is controlled by the intelligent test bench 1. The gas meter 2 to be tested and the gas flow standard device 3 are also electrically connected to the intelligent test bench 1, allowing the intelligent test bench 1 to obtain data from the gas meter 2 to be tested and the gas flow standard device 3. The first difference value can be 0 or other values. The first difference value is preset to enable the gas meter 2 to respond to the mechanical wave noise of the first vibration frequency. The second difference value can be 24 kHz or other values. The second difference value is preset to prevent the gas flow standard device 3 from responding to the mechanical wave noise of the first vibration frequency.

[0061] The difference between the first test reading and the first reference reading is calculated to obtain a first error value. After calculating the first error value, the intelligent test bench 1 can draw a conclusion about the gas meter 2 to be tested. If the first error value is less than a preset error value, it indicates that the gas meter 2 to be tested has a low error in a mechanical wave noise environment having the first vibration frequency, and the gas meter 2 to be tested has passed the anti-interference test and has good anti-interference performance. The first error value can represent the error level of the gas meter 2 to be tested under the aforementioned environment.

[0062] Next, the intelligent test bench 1 can control the ultrasonic transducer 5 to stop emitting mechanical wave noise at the first vibration frequency, and then control the ultrasonic transducer 5 to emit mechanical wave noise at a second vibration frequency, which can be 525 kHz. The intelligent test bench 1 can also control the ultrasonic transducer 5 to simultaneously emit mechanical wave noise at both the first and second vibration frequencies. The ultrasonic transducer 5 applies the second vibration frequency to the gas meter 2 to be tested and the gas flow standard device 3, which are operating simultaneously and located in the same pipeline, to obtain a second test reading of the gas meter 2 to be tested and a second reference reading of the gas flow standard device 3. The difference between the second vibration frequency and the first operating frequency is greater than a preset third difference, and the difference between the second vibration frequency and the second operating frequency is less than a preset fourth difference. The third difference can be 24 kHz or another value. The third difference is preset to prevent the gas meter 2 to be tested from responding to the mechanical wave noise at the second vibration frequency. The fourth difference can be 0 or another value. The fourth difference is preset to prevent the gas flow standard device 3 from responding to the mechanical wave noise at the second vibration frequency.

[0063] The difference between the second test reading and the second reference reading is calculated to obtain a second error value, and the difference between the first error value and the second error value is taken as the comparative error value. After calculating the second error value, the intelligent test bench 1 can make a conclusion about the gas flow standard device 3. If the second error value is less than another preset error value, it means that the gas flow standard device 3 is in the expected normal working state and its reference function is stable. After the intelligent test bench 1 further calculates the comparative error value, it can represent the error level of the gas meter 2 to be tested. The comparative error value can represent the relative magnitude relationship between the error level of the gas meter 2 to be tested and the error level of the gas flow standard device 3. The optimal test result is: under static conditions, when mechanical wave noise with a forward power range of 60W and a frequency range of 100KHz-1000KHz is applied to the six surfaces of the X, Y, and Z axes of the gas meter 2 to be tested and the gas flow standard device 3, the cumulative flow of the gas meter 2 to be tested and the gas flow standard device 3 should not change. Under dynamic conditions, in the air medium, the Z-axes of the gas meter 2 to be tested and the gas flow standard device 3 are clamped. At the maximum flow rate, mechanical wave noise with a forward power range of 60W and a frequency range of 100KHz-1000KHz is applied to the gas meter 2 to be tested and the gas flow standard device 3. The instantaneous flow of the gas meter 2 to be tested and the gas flow standard device 3 should be basically consistent with the instantaneous flow before the interference, and the flow fluctuation range should not be greater than ±5%.

[0064] A flow field disruptor 6 is installed in the pipeline between the gas meter 2 to be tested and the gas flow standard device 3 to interfere with the flow field of the gas meter 2 to be tested. The flow field disruptor 6 has a gas branch with a spoiler and / or an elbow built in. When the flow field disruptor 6 has a spoiler built in, spoilers of the same shape are installed at the air inlet and outlet of the gas meter 2 to be tested at the same time. With 90 degrees as a rotation unit, a set of numerical error tests are carried out at the flow points of qmax and 0.2qmax. When the air inlet and outlet simultaneously complete a 360-degree rotation, a total of four sets of indication error tests are carried out for a total of four rotation units in terms of spatial shape. Then, spoilers of other shapes are replaced and another four sets of indication error tests are carried out. After the tests of all spoiler shapes are completed, the maximum indication error is taken as the result, and the requirement that the indication error is not lower than the accuracy grade is met. When a bend is provided inside the flow field disruptor 6, a bend is added to the air inlet of the gas meter 2 to be tested, and a set of indication error tests are performed at the flow points of qmax and 0.2qmax with 90° as a rotation unit. After completing 4 sets of indication error tests with four rotation units of 360°, the maximum indication error is taken as the result, which satisfies the requirement that the indication error is not lower than the accuracy grade. When a spoiler and a bend are provided inside the flow field disruptor 6, a bend is added to the air inlet of the gas meter 2 to be tested, and then spoilers of the same shape are installed at the air inlet and outlet of the gas meter 2 to be tested. The bend and the spoiler rotate simultaneously, and they are rotated at 90° as a rotation unit. A set of indication error tests are performed at the flow points of qmax and 0.2qmax with 90° as a rotation unit. After completing 4 sets of indication error tests with four rotation units of 360°, the maximum indication error is taken as the result, which satisfies the requirement that the indication error is not lower than the accuracy grade.

[0065] The intelligent test bench 1 obtains the first flow field reading of the gas meter 2 to be tested after being subjected to flow field interference and the second flow field reading of the gas flow standard device 3 after not being subjected to flow field interference. The first flow field reading is the maximum value of the indication error after the test using one of the three flow field interference test methods selected above. The intelligent test bench 1 calculates the difference between the first flow field reading and the second flow field reading to obtain the flow field error value. The intelligent test bench 1 can test the flow field interference alone in the absence of mechanical wave noise, or it can add the flow field interference of the gas when testing external vibration frequency interference, thereby further amplifying the error value of the gas meter 2 to be tested. Then, the intelligent test bench 1 can know whether the error value of the gas meter 2 to be tested is a simple addition of the error of the vibration frequency interference and the error of the flow field interference. If it is much larger than the simple addition of the two, it means that the anti-interference performance of the gas meter 2 to be tested is weak.

[0066] A gas branch circuit with a built-in pulsating flow rate is installed at the flow field interference point. This branch circuit is equipped with an electronically controlled gas valve with adjustable flow rate. This branch circuit is connected in parallel to the pipeline between the gas meter 2 to be tested and the gas flow standard device 3 via a reversing valve. During the pulsating interference test, the pulsating flow point should be selected within the range of 0.07qmax-0.375qmax. The pulsating waveform should be set to a 50% duty cycle, the single-cycle valve opening time should be set to 0.25s, the waveform phase adjustment should be adjusted in increments of 0.05s, and the pulsating flow duration should be no less than 30 minutes. Under pulsating flow conditions, a typical point with the largest instantaneous flow rate error between the sample meter and the reference standard should be selected. Three indication error tests should be conducted at this point, and the average of these three indication errors should be taken as the result, meeting the requirement that the indication error should not exceed ±5%.

[0067] The intelligent test bench 1 obtains the first pulsation reading of the gas meter 2 to be tested after being subjected to pulsation interference and the second pulsation reading of the gas flow standard device 3 after not being subjected to pulsation interference. The second pulsation reading is the average value of the indication error after the above-mentioned pulsation interference test method is tested. The intelligent test bench 1 calculates the difference between the first pulsation reading and the second pulsation reading to obtain the pulsation error value. The intelligent test bench 1 can test the pulsation interference alone in the absence of mechanical wave noise and flow field interference; it can also add pulsation interference when testing external vibration frequency interference; it can also add pulsation interference when testing flow field interference; it can also add gas pulsation interference in the presence of mechanical wave noise and flow field interference, thereby further amplifying the error value of the gas meter 2 to be tested. Then, the intelligent test bench 1 can know whether the error value of the gas meter 2 to be tested is a simple addition of the error of other interferences and the error of pulsation interference. If it is much larger than the simple addition of the two, it means that the anti-interference performance of the gas meter 2 to be tested is weak.

[0068] Electromagnetic interference is set in the pipeline between the gas meter 2 to be tested and the gas flow standard device 3, that is, a magnetic field generator 8 is placed between the gas meter to be tested and the gas flow standard device 3, and the magnetic field generator 8 generates the required magnetic field interference signal and / or electric field interference signal. When using the magnetic field generator 8 to perform a static magnetic field interference test, electromagnetic interference signals with a forward power range of 30W-50W and a frequency range of 20KHz-5000KHz are applied to the six surfaces of the three axes X, Y and Z of the gas meter respectively. The accumulated flow of the gas meter under test should not change. When using the magnetic field generator 8 to perform a dynamic magnetic field interference test, the Z axis of the gas meter under test is clamped in the air medium. At the maximum flow rate, an electromagnetic interference signal with a forward power range of 30W-50W and a frequency range of 20KHz-5000KHz is applied to the gas meter under test. The instantaneous flow of the gas meter under test should be basically consistent with the instantaneous flow before the interference, and the flow fluctuation range is no more than ±5%. When using magnetic field generator 8 for dynamic electromagnetic interference testing, the Z axis of the gas meter under test is clamped in air. At maximum flow, an electromagnetic interference signal with a forward power range of 30W-50W and a frequency range of 20kHz-5000kHz is applied to the gas meter under test. The instantaneous flow rate of the gas meter under test should be basically consistent with the instantaneous flow rate before the interference, with a flow rate fluctuation range of no more than ±5%. When using magnetic field generator 8 for static electric field interference testing, electric field interference signals with a forward power range of 30W and a frequency range of 20kHz-5000kHz are applied to the four directions of the X and Y axes of the gas meter under test. The cumulative flow rate of the gas meter under test should not change.

[0069] The intelligent test bench 1 obtains a first electromagnetic reading of the gas meter 2 to be tested after being subjected to electromagnetic interference and a second electromagnetic reading of the gas flow standard device 3 after being free of electromagnetic interference. The intelligent test bench 1 calculates the difference between the first and second electromagnetic readings to obtain a magnetic field error value. The intelligent test bench 1 can test the pulsation interference alone in the absence of mechanical wave noise, flow field interference and pulsation interference; it can also add pulsation interference when testing external vibration frequency interference; it can also add pulsation interference when testing flow field interference; it can also add electromagnetic interference when testing pulsation interference; it can also add electromagnetic interference of gas when there are mechanical wave noise and flow field interference; it can also add electromagnetic interference of gas when there are mechanical wave noise and pulsation interference; it can also add electromagnetic interference of gas when there are pulsation wave noise and flow field interference; it can also add electromagnetic interference of gas when there are mechanical wave noise, flow field interference and pulsation interference, so as to further amplify the error value of the gas meter 2 to be tested, and then the intelligent test bench 1 can know whether the error value of the gas meter 2 to be tested is a simple addition of the errors of other interferences and the errors of electromagnetic interference. If it is much larger than the simple addition of the two, it means that the anti-interference performance of the gas meter 2 to be tested is weak.

[0070] The implementation principle of the anti-interference detection method of an ultrasonic gas meter in the embodiment of the present application is as follows: when a first vibration frequency that can affect the gas meter 2 to be detected is used, the gas meter 2 to be detected will have a deviation, while the first vibration frequency has little effect on the gas flow standard device 3. Using the gas flow standard device 3 whose working frequency is different from the working frequency of the gas meter 2 to be detected as a reference, the first error value calculated by comparing the first test reading with the first reference reading can represent the error of the gas meter 2 to be detected when the external vibration frequency is the same as the working frequency of the ultrasonic transducer 5 built into the ultrasonic gas meter. In addition, the second error value that can represent the error of the gas flow standard device 3 is calculated, and the comparison error value of the first error value and the second error value can clearly reflect the error degree of the gas meter 2 to be detected: if the error of the gas meter 2 to be detected itself is not large, the error degree will be small; if the error of the gas meter 2 to be detected itself is large, the error between the gas meter 2 to be detected and the gas flow standard device 3 will be large, which will make the error degree larger.

[0071] The present application also discloses an anti-interference detection system for an ultrasonic gas meter. Figure 2 , an anti-interference detection system for ultrasonic gas meters, including the following modules:

[0072] The acquisition module 4 is used to acquire the first operating frequency of the gas meter 2 to be detected and the second operating frequency of the calibrated gas flow standard device 3 , where the first operating frequency is different from the second operating frequency.

[0073] The ultrasonic transducer 5 is used to emit mechanical wave noise in different frequency ranges.

[0074] The flow field disruptor 6 includes a gas branch with a built-in spoiler and / or an elbow. The gas branch is connected in parallel to the pipeline between the gas meter 2 to be tested and the gas flow standard device 3 through a reversing valve.

[0075] The pulsation disruptor 7 includes a built-in gas branch for generating pulsating flow, and the gas branch is connected in parallel to the pipeline between the gas meter 2 to be tested and the gas flow standard device 3 through a reversing valve.

[0076] The magnetic field generator 8 is used to generate the required magnetic field interference signal and / or electric field interference signal. The acquisition module 4 and other modules are all arranged in the intelligent test bench 1.

[0077] The intelligent test bench 1 also includes:

[0078] The first control module 9 is electrically connected to the acquisition module 4 and the ultrasonic transducer 5, and is used to control the ultrasonic transducer 5 to apply a first vibration frequency to the gas meter 2 to be tested and the gas flow standard device 3 that are working simultaneously and located in the same pipeline, to obtain a first test reading of the gas meter 2 to be tested and a first reference reading of the gas flow standard device 3; wherein the difference between the first vibration frequency and the first operating frequency is less than a preset first difference, and the difference between the first vibration frequency and the second operating frequency is greater than a preset second difference.

[0079] The first calculation module 10 is electrically connected to the control module, and is used to obtain a first test reading and a first reference reading and calculate the difference to obtain a first error value.

[0080] The second control module 11 is electrically connected to the acquisition module 4 and the ultrasonic transducer 5, and is used to control the ultrasonic transducer 5 to apply a second vibration frequency to the gas meter 2 to be tested and the gas flow standard device 3 that are working simultaneously and located in the same pipeline, to obtain a second test reading of the gas meter 2 to be tested and a second reference reading of the gas flow standard device 3; wherein the difference between the second vibration frequency and the first operating frequency is greater than the preset third difference, and the difference between the second vibration frequency and the second operating frequency is less than the preset fourth difference.

[0081] The second calculation module 12 is electrically connected to the first calculation module 10 and the second control module 11, and is used to obtain the second test reading, the second reference reading and the first error value, calculate the difference between the second test reading and the second reference reading to obtain the second error value, and take the difference between the first error value and the second error value as the comparison error value.

[0082] The third control module 13 is electrically connected to the flow field disruptor 6, and is used to control the flow field disruptor 6 to be connected to the pipeline between the gas meter 2 to be tested and the gas flow standard device 3 to form flow field interference, and obtain the first flow field reading of the gas meter 2 to be tested after the flow field interference and the second flow field reading of the gas flow standard device 3 after the flow field interference.

[0083] The third calculation module 14 is electrically connected to the third control module 13 and is used to calculate the difference between the first flow field reading and the second flow field reading to obtain a flow field error value.

[0084] The fourth control module 15 is electrically connected to the pulsation disruptor 7, and is used to control the pulsation disruptor 7 to be connected to the pipeline between the gas meter 2 to be tested and the gas flow standard device 3 to form pulsation interference, and obtain the first pulsation reading of the gas meter 2 to be tested after being subjected to pulsation interference and the second pulsation reading of the gas flow standard device 3 after not being subjected to pulsation interference.

[0085] The fourth calculation module 16 is electrically connected to the fourth control module 15 and is used to calculate the difference between the first pulsation reading and the second pulsation reading to obtain a pulsation error value.

[0086] The fifth control module 17 is electrically connected to the magnetic field generator 8, and is used to control the magnetic field generator 8 to set electromagnetic interference in the pipeline between the gas meter 2 to be tested and the gas flow standard device 3, and obtain the first electromagnetic reading after the gas meter 2 to be tested is subjected to electromagnetic interference and the second electromagnetic reading after the gas flow standard device 3 is not subjected to electromagnetic interference.

[0087] The fifth calculation module 18 is electrically connected to the fifth control module 17 and is configured to calculate the difference between the first electromagnetic reading and the second electromagnetic reading to obtain a magnetic field error value.

[0088] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An anti-interference detection method for an ultrasonic gas meter, characterized in that: The steps include: Acquiring a first operating frequency of a gas meter (2) to be tested, and acquiring a second operating frequency of a calibrated gas flow standard device (3), wherein the first operating frequency is different from the second operating frequency; A first vibration frequency is applied to the gas meter (2) to be tested and the gas flow standard device (3) which are working at the same time and located in the same pipeline, and a first test reading of the gas meter (2) to be tested and a first reference reading of the gas flow standard device (3) are obtained; wherein the difference between the first vibration frequency and the first operating frequency is less than a preset first difference, and the difference between the first vibration frequency and the second operating frequency is greater than a preset second difference; and, calculating a difference between the first test reading and the first reference reading to obtain a first error value; The first difference is preset so that the gas meter (2) to be tested can respond to the mechanical wave noise of the first vibration frequency, and the second difference is preset so that the gas flow standard device (3) does not respond to the mechanical wave noise of the first vibration frequency; The method also includes: A second vibration frequency is applied to the gas meter (2) to be tested and the gas flow standard device (3) which are working simultaneously and located in the same pipeline, to obtain a second test reading of the gas meter (2) to be tested and a second reference reading of the gas flow standard device (3); wherein the difference between the second vibration frequency and the first operating frequency is greater than a preset third difference, and the difference between the second vibration frequency and the second operating frequency is less than a preset fourth difference; The third difference is preset so that the gas meter to be tested (2) does not respond to the mechanical wave noise of the second vibration frequency, and the fourth difference is preset so that the gas flow standard device (3) responds to the mechanical wave noise of the second vibration frequency; Furthermore, the difference between the second test reading and the second reference reading is calculated to obtain a second error value, and the difference between the first error value and the second error value is taken as a comparative error value; if the second error value is less than another preset error value, the gas flow standard device (3) is in the expected normal working state, and the comparative error value represents the error degree of the gas meter (2) to be tested.

2. The anti-interference detection method of an ultrasonic gas meter according to claim 1, characterized in that: The method further comprises: A flow field interference is set in the pipeline between the gas meter to be tested (2) and the gas flow standard device (3), and a first flow field reading of the gas meter to be tested (2) after being subjected to the flow field interference and a second flow field reading of the gas flow standard device (3) after not being subjected to the flow field interference are obtained; And, a difference between the first flow field reading and the second flow field reading is calculated to obtain a flow field error value.

3. The anti-interference detection method of an ultrasonic gas meter according to claim 1, characterized in that: The method further comprises: Setting a pulsation disturbance at the flow field disturbance location, obtaining a first pulsation reading of the gas meter (2) to be tested after being subjected to the pulsation disturbance and a second pulsation reading of the gas flow standard device (3) after not being subjected to the pulsation disturbance; And, a difference between the first pulsation reading and the second pulsation reading is calculated to obtain a pulsation error value.

4. The anti-interference detection method of an ultrasonic gas meter according to claim 1, characterized in that: The method further comprises: An electromagnetic interference is set in the pipeline between the gas meter to be detected (2) and the gas flow standard device (3), and a first electromagnetic reading of the gas meter to be detected (2) after being subjected to the electromagnetic interference and a second electromagnetic reading of the gas flow standard device (3) after not being subjected to the electromagnetic interference are obtained; And, a difference between the first electromagnetic reading and the second electromagnetic reading is calculated to obtain a magnetic field error value. 5.An anti-interference detection system for an ultrasonic gas meter, characterized in that: Includes the following modules: An acquisition module (4) is used to acquire a first operating frequency of the gas meter (2) to be detected and to acquire a second operating frequency of a calibrated gas flow standard device (3), wherein the first operating frequency is different from the second operating frequency; Ultrasonic transducer (5), used for emitting mechanical wave noise in different frequency ranges; A first control module (9) is electrically connected to the acquisition module (4) and the ultrasonic transducer (5), and is used to control the ultrasonic transducer (5) to apply a first vibration frequency to the gas meter (2) to be detected and the gas flow standard device (3) which are working simultaneously and located in the same pipeline, so as to obtain a first test reading of the gas meter (2) to be detected and a first reference reading of the gas flow standard device (3); wherein the difference between the first vibration frequency and the first operating frequency is less than a preset first difference, and the difference between the first vibration frequency and the second operating frequency is greater than a preset second difference; and a first calculation module (10), electrically connected to the control module, for obtaining the first test reading and the first reference reading and calculating a difference to obtain a first error value; The first difference is preset so that the gas meter (2) to be tested can respond to the mechanical wave noise of the first vibration frequency, and the second difference is preset so that the gas flow standard device (3) does not respond to the mechanical wave noise of the first vibration frequency; The system further comprises: a second control module (11), electrically connected to the acquisition module (4) and the ultrasonic transducer (5), and used for controlling the ultrasonic transducer (5) to apply a second vibration frequency to the gas meter (2) to be detected and the gas flow standard device (3) which are working simultaneously and located in the same pipeline, so as to obtain a second test reading of the gas meter (2) to be detected and a second reference reading of the gas flow standard device (3); wherein the difference between the second vibration frequency and the first operating frequency is greater than a preset third difference, and the difference between the second vibration frequency and the second operating frequency is less than a preset fourth difference; The third difference is preset so that the gas meter to be tested (2) does not respond to the mechanical wave noise of the second vibration frequency, and the fourth difference is preset so that the gas flow standard device (3) responds to the mechanical wave noise of the second vibration frequency; And, a second calculation module (12) is electrically connected to the first calculation module (10) and the second control module (11), and is used to obtain the second test reading, the second reference reading and the first error value, calculate the difference between the second test reading and the second reference reading to obtain a second error value, and take the difference between the first error value and the second error value as a comparison error value; if the second error value is less than another preset error value, the gas flow standard device (3) is in an expected normal working state, and the comparison error value represents the error degree of the gas meter (2) to be tested.

6. The anti-interference detection system for an ultrasonic gas meter according to claim 5, characterized in that: The system further comprises: The flow field disruptor (6) comprises a gas branch circuit with a spoiler and / or a bend pipe built therein, wherein the gas branch circuit is connected in parallel to the pipeline between the gas meter to be tested (2) and the gas flow standard device (3) via a reversing valve; a third control module (13), electrically connected to the flow field disruptor (6), and used to control the flow field disruptor (6) to be connected to the pipeline between the gas meter to be detected (2) and the gas flow standard device (3) to form flow field interference, and obtain a first flow field reading of the gas meter to be detected (2) after being subjected to flow field interference and a second flow field reading of the gas flow standard device (3) after not being subjected to flow field interference; And, a third calculation module (14) is electrically connected to the third control module (13) and is used to calculate the difference between the first flow field reading and the second flow field reading to obtain a flow field error value.

7. The anti-interference detection system for an ultrasonic gas meter according to claim 5, characterized in that: The system further comprises: The pulsation disruptor (7) comprises a gas branch circuit that generates a pulsating flow, the gas branch circuit being connected in parallel to a pipeline between the gas meter to be tested (2) and the gas flow standard device (3) via a reversing valve; A fourth control module (15) is electrically connected to the pulsation disruptor (7) and is used to control the pulsation disruptor (7) to be connected to the pipeline between the gas meter to be detected (2) and the gas flow standard device (3) to form pulsation interference, and obtain a first pulsation reading of the gas meter to be detected (2) after being subjected to pulsation interference and a second pulsation reading of the gas flow standard device (3) after not being subjected to pulsation interference; And, a fourth calculation module (16) is electrically connected to the fourth control module (15) and is used to calculate the difference between the first pulsation reading and the second pulsation reading to obtain a pulsation error value.

8. The anti-interference detection system for an ultrasonic gas meter according to claim 5, characterized in that: The system further comprises: A magnetic field generator (8), used to generate a required magnetic field interference signal and / or electric field interference signal; a fifth control module (17), electrically connected to the magnetic field generator (8), and used to control the magnetic field generator (8) to set electromagnetic interference in the pipeline between the gas meter to be detected (2) and the gas flow standard device (3), and obtain a first electromagnetic reading of the gas meter to be detected (2) after being subjected to the electromagnetic interference and a second electromagnetic reading of the gas flow standard device (3) after not being subjected to the electromagnetic interference; And, a fifth calculation module (18) is electrically connected to the fifth control module (17) and is used to calculate the difference between the first electromagnetic reading and the second electromagnetic reading to obtain a magnetic field error value.

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