A method and system for optimizing measurement data of ultrasonic gas meter

Abstract

The present invention discloses a method and system for optimizing metering data of an ultrasonic gas meter, relates to the technical field of ultrasonic metering, and solves the problem in the prior art that the sensitivity analysis does not cover the factor of tiny flow leakage, resulting in deviation in determining the compensation factor; the present invention obtains a gas meter distribution map from a database, and installs an ultrasonic gas meter according to the distribution map; determines whether the ultrasonic gas meter is installed in the forward direction; determines whether the ultrasonic gas meter passes the anti-dismantling detection; determines whether there is a tiny flow leakage in the gas meter; calculates an error value through the recorded value in the gas meter and the actual gas flow; corrects the gas meter according to the error value; determines whether the actual gas usage after the error correction meets the safety gas usage standard; if yes, completes the data optimization of the gas meter; if not, sends a reminder signal; the present invention comprehensively considers the factors of error in the ultrasonic gas meter, which is conducive to more accurate optimization of the metering data.

Description

Technical Field

[0001] The invention belongs to the field of ultrasonic metering, relates to metering data optimization technology, and specifically is a method and system for optimizing metering data of an ultrasonic gas meter. Background Art

[0002] Ultrasonic gas meters are new electronic meters that eliminate traditional gas theft methods from the perspective of structure and measurement accuracy. At the same time, through reverse valve closing, micro-flow monitoring and other intelligent application technologies, they truly realize the background supervision of illegal gas use. Ultrasonic gas meters have high accuracy and good repeatability.

[0003] The prior art (invention patent application with publication number CN117573668A) discloses an optimization method based on ultrasonic gas meter metering data, which relates to the technical field of metering data optimization. If the relative strength index obtained by analysis does not meet expectations, the influence of the measurement conditions on the relative strength index is calculated, and according to the influence, it is determined whether the gas meter measurement data needs to be compensated; an initial compensation model for the gas meter measurement data is constructed, and after multivariate optimization, a sensitivity analysis is performed on the optimized compensation model to complete the subsequent optimization plan; however, in the prior art, since the sensitivity analysis does not cover the factor of small flow leakage, there is a problem of deviation in the determination of the compensation factor.

[0004] The present invention provides an ultrasonic gas meter measurement data optimization method and system to solve the above technical problems. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes an ultrasonic gas meter metering data optimization method for solving the technical problem in the prior art that the sensitivity analysis does not cover the factor of tiny flow leakage, resulting in deviation in the determination of the compensation factor.

[0006] To achieve the above object, a first aspect of the present invention provides a method for optimizing ultrasonic gas meter measurement data, comprising:

[0007] Step S100: Obtain a gas meter distribution map from a database, and install an ultrasonic gas meter according to the distribution map; determine whether the ultrasonic gas meter is installed in the forward direction; if yes, perform an anti-disassembly test on the ultrasonic gas meter; if no, immediately close the valve and issue an alarm signal 1; determine whether the ultrasonic gas meter passes the anti-disassembly test; if yes, calculate the actual gas flow by measuring the ultrasonic signal; if no, immediately close the valve and issue an alarm signal 2;

[0008] Step S200: determine whether there is a small flow leakage in the gas meter; if yes, issue a warning signal; if no, obtain the recorded value of the real-time gas flow in the gas meter from the database; calculate the error value by the recorded value in the gas meter and the actual gas flow; calibrate the gas meter according to the error value;

[0009] Step S300: Determine whether the actual gas usage after error correction meets the safe gas usage standard; if yes, complete the data optimization of the gas meter; if not, issue a reminder signal.

[0010] Preferably, the step of determining whether the ultrasonic gas meter is installed in the forward direction includes:

[0011] Set the specific directions of forward installation and reverse installation to determine whether the reverse gas leakage content of the gas meter is lower than the set threshold; if yes, the gas meter is forward installed; if no, determine whether the duration of reverse gas leakage exceeds the set time; if yes, the gas meter is reverse installed; if no, the gas meter is forward installed.

[0012] It should be noted that the threshold and time settings are determined by the staff based on actual work experience.

[0013] The present invention can prevent gas leakage caused by incorrect installation by detecting the installation direction and gas flow direction of the gas meter, thereby improving the safety of use.

[0014] Preferably, the step of determining whether the ultrasonic gas meter passes the anti-disassembly detection includes:

[0015] Obtain the normal range of ultrasonic signal propagation speed at different times from the database; record the ultrasonic signal propagation speed at different times through the ultrasonic gas meter; determine whether the ultrasonic signal propagation speed in the ultrasonic detection meter is within the normal range; if yes, the ultrasonic gas meter passes the anti-dismantling test; if no, the ultrasonic gas meter fails the anti-dismantling test; wherein the different times include: the time when the user uses gas, and the time when the user does not use gas.

[0016] The present invention can improve the metering accuracy of the gas meter and ensure accurate recording of gas usage by ensuring that the propagation speed of the ultrasonic signal is within a normal range; by considering the different time points when the user uses gas and does not use gas, the working state of the gas meter can be more comprehensively evaluated, which is conducive to more accurate calculation of errors under different usage conditions.

[0017] Preferably, calculating the actual gas flow rate by measuring the ultrasonic signal includes:

[0018] In the ultrasonic gas meter, an upstream sensor and a downstream sensor are set, the gas propagation path is marked as L(m), the angle between the propagation path and the horizontal plane is marked as θ, and the propagation speed of the sound wave in the static state of the medium is marked as ; The average axial velocity of the fluid is marked as ;

[0019] By formula Calculate the downstream flow time from the upstream sensor to the downstream sensor;

[0020] By formula Calculate the backflow time from the downstream sensor to the upstream sensor;

[0021] By formula The gas flow rate is calculated.

[0022] The flow area is marked as ;

[0023] By formula Calculate the actual gas flow.

[0024] Preferably, the determining whether there is a small flow leakage in the gas meter includes:

[0025] Obtain the user's non-gas usage time period from the database and turn on the small flow self-test mode of the gas meter; determine whether there is an instantaneous flow that exceeds the set content threshold during the non-gas usage time period; if so, record the duration of the instantaneous flow; if not, there is no small flow leakage in the gas meter; determine whether the duration of the instantaneous flow exceeds the set time threshold; if so, there is a small flow leakage in the gas meter; if not, there is no small flow leakage in the gas meter.

[0026] It should be noted that the content threshold and time threshold are set according to the actual working process of the staff; when detecting small flow leakage, the fuzzy control strategy is used to eliminate the interference of normal gas use behavior.

[0027] The present invention can detect small flow leakage problems of gas meters early by detecting in non-gas usage time periods; by combining the dual judgment of content threshold and time threshold, it can effectively distinguish normal gas usage behavior from abnormal leakage; through fuzzy control strategy, it can further reduce the false alarm rate and improve the accuracy of detection.

[0028] Preferably, the error value is calculated by using the recorded value in the gas meter and the actual gas flow, including:

[0029] Mark the recorded values ​​in the gas meter as , and retrieve the actual gas flow ;

[0030] By formula Calculate the difference; determine whether the difference is less than 0; if yes, issue a reminder signal and ask the staff to perform maintenance; if no, take the difference as the change value one;

[0031] Set a collection interval, and obtain real-time data from several gas meters according to the collection interval; the real-time data includes: temperature data and pressure data;

[0032] Set the real-time temperature change to A (°C), then the change value is a% of the recorded value;

[0033] If the pipeline pressure changes by B (kpa), the change value is b% of the recorded value;

[0034] Sum the change values ​​1, 2, and 3 to get the average value, take the average value as the error value and mark the error value as .

[0035] It should be noted that the specific value of the error correction standard is set by the staff based on actual work conditions.

[0036] The present invention can detect data anomalies in time by comparing the recorded value in the gas meter with the actual gas flow and calculating the difference; when the difference is less than 0, this usually means that there is an error in the recorded value or the gas meter may be faulty. At this time, a reminder signal is sent to allow staff to intervene in time for maintenance, thereby avoiding the accumulation of erroneous data and misleading subsequent analysis; by setting a quantitative standard for the impact of real-time temperature changes and pressure changes on recorded values, it is beneficial to correct errors according to different environmental conditions in the later stage.

[0037] Preferably, the calibrating the gas meter according to the error value includes:

[0038] Retrieve the recorded value JZ and error value E, and use the formula Calculate the corrected gas value; determine whether the gas meter functions normally; if yes, adjust the recorded value in the gas meter to the corrected gas value; if no, send a repair signal; wherein the functions of the gas meter include: the dial rotates normally and the pointer points correctly.

[0039] The present invention can effectively reduce the reading deviation caused by gas meter error or environmental factors by calculating the corrected gas value, ensure the high consistency between the gas volume used by the user and the actual measured value, and improve the reliability of the data.

[0040] Preferably, the step of judging whether the actual gas usage after error correction meets the safety gas usage standard includes:

[0041] Retrieve the calibrated gas meter record value to determine whether the calibrated gas meter record value exceeds the gas usage upper limit; if so, the actual gas usage does not meet the safe gas usage standard; if not, determine whether the gas meter record value is higher than the instantaneous excess flow threshold; if so, the actual gas usage does not meet the safe gas usage standard; if not, the actual gas usage meets the safe gas usage standard.

[0042] By setting a gas usage upper limit, the present invention can monitor the user's gas usage in real time to prevent safety hazards caused by excessive usage; by setting an instantaneous overflow threshold, it can promptly detect and prevent abnormal increases in gas flow in a short period of time, which is conducive to timely intervention to prevent the occurrence of fire and explosion accidents.

[0043] To achieve the above-mentioned object, the second aspect of the present invention provides an ultrasonic gas meter measurement data optimization system, comprising: an equipment inspection module, a data calibration module, a safety monitoring module, and a user interface module;

[0044] Equipment inspection module: obtain the gas meter distribution map from the database, install the ultrasonic gas meter according to the distribution map; determine whether the ultrasonic gas meter is installed in the forward direction; if yes, perform anti-dismantling detection on the ultrasonic gas meter; if no, immediately close the valve and issue an alarm signal 1; determine whether the ultrasonic gas meter passes the anti-dismantling detection; if yes, calculate the actual gas flow by measuring the ultrasonic signal; if no, immediately close the valve and issue an alarm signal 2;

[0045] Data calibration module: Determine whether there is a small flow leakage in the gas meter; if yes, issue a warning message; if no, obtain the recorded value of the real-time gas flow in the gas meter from the database; calculate the error value through the recorded value in the gas meter and the actual gas flow; calibrate the gas meter according to the error value;

[0046] Safety monitoring module: determines whether the actual gas usage after error correction meets the safety gas usage standards; if yes, completes the data optimization of the gas meter; if not, issues a reminder signal.

[0047] Preferably, the system also includes: a user interface module: used to display alarm signals and various data; wherein the alarm signals include: alarm signal one, alarm signal two, early warning signal, reminder signal and repair signal; various data include: actual gas flow, real-time gas flow record value, error value and corrected gas meter record value.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 1. The installation and forward installation detection of ultrasonic gas meters ensure the accuracy of gas meter installation, thereby reducing measurement errors and safety risks caused by improper installation; the anti-dismantling detection function can timely detect and prevent illegal dismantling of gas meters, ensuring the integrity and accuracy of metering data, while improving the safety of the system; when an abnormality is detected, the system can respond quickly and close the valve to prevent the accident from expanding and ensure the safety of users and the environment; the data calibration module calculates and corrects errors by comparing the real-time gas flow with the measured value of the ultrasonic gas meter, making the gas meter data more accurate and reliable.

[0050] 2. The user interface module provides an intuitive and comprehensive information display, including actual gas flow, error value, corrected recorded value, etc., so that users can clearly understand the gas usage; the timely display of alarm signals allows users to quickly understand and respond to abnormal situations, improving user experience and satisfaction; through timely fault detection and early warning, problems can be discovered and solved in advance, avoiding greater losses caused by equipment failure; accurate data calibration and error correction extend the service life of the gas meter and reduce replacement and maintenance costs; the safety monitoring module ensures that users' gas use meets safety standards, which helps reduce energy waste and environmental pollution caused by gas leaks and other reasons. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0052] Figure 1 It is a flow chart of the data optimization method of the present invention;

[0053] Figure 2 A schematic diagram of specific steps for inspecting the equipment of the present invention;

[0054] Figure 3 A schematic diagram of the specific steps of data calibration of the present invention;

[0055] Figure 4 Schematic diagram of the relationship between modules included in the data optimization system of the present invention. DETAILED DESCRIPTION

[0056] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] See also Figure 1 The first aspect of the present invention provides an ultrasonic gas meter measurement data optimization method, comprising:

[0058] Step S100: Obtain a gas meter distribution map from a database, and install an ultrasonic gas meter according to the distribution map; determine whether the ultrasonic gas meter is installed in the forward direction; if yes, perform an anti-disassembly test on the ultrasonic gas meter; if no, immediately close the valve and issue an alarm signal 1; determine whether the ultrasonic gas meter passes the anti-disassembly test; if yes, calculate the actual gas flow by measuring the ultrasonic signal; if no, immediately close the valve and issue an alarm signal 2;

[0059] Step S200: determine whether there is a small flow leakage in the gas meter; if yes, issue a warning signal; if no, obtain the recorded value of the real-time gas flow in the gas meter from the database; calculate the error value by the recorded value in the gas meter and the actual gas flow; calibrate the gas meter according to the error value;

[0060] Step S300: Determine whether the actual gas usage after error correction meets the safe gas usage standard; if yes, complete the data optimization of the gas meter; if not, issue a reminder signal.

[0061] See also Figure 2 , the specific steps of equipment inspection are: obtain the gas meter distribution map from the database, and install the ultrasonic gas meter according to the distribution map; set the specific directions of forward installation and reverse installation, and judge whether the reverse gas content of the gas meter is lower than the set threshold; if yes, the gas meter is installed in the forward direction, and the ultrasonic gas meter is tested for anti-disassembly; if no, judge whether the duration of the reverse gas flow exceeds the set time; if yes, the gas meter is installed in the reverse direction, close the valve immediately and send an alarm signal; if no, the gas meter is installed in the forward direction, and the ultrasonic gas meter is tested for anti-disassembly;

[0062] Obtain the normal range of ultrasonic signal propagation speed at different times from the database; record the ultrasonic signal propagation speed at different times through the ultrasonic gas meter; determine whether the ultrasonic signal propagation speed in the ultrasonic detection meter is within the normal range; if yes, the ultrasonic gas meter passes the anti-disassembly test; if no, the ultrasonic gas meter fails the anti-disassembly test, immediately close the valve and send out an alarm signal; wherein, the different times include: the time when the user uses gas, and the time when the user does not use gas;

[0063] In the ultrasonic gas meter, an upstream sensor and a downstream sensor are set, the gas propagation path is marked as L(m), the angle between the propagation path and the horizontal plane is marked as θ, and the propagation speed of the sound wave in the static state of the medium is marked as ; The average axial velocity of the fluid is marked as ;

[0064] By formula Calculate the downstream flow time from the upstream sensor to the downstream sensor;

[0065] By formula Calculate the backflow time from the downstream sensor to the upstream sensor;

[0066] By formula The gas flow rate is calculated.

[0067] The flow area is marked as ;

[0068] By formula Calculate the actual gas flow.

[0069] For example, ultrasonic gas meters A and B need to be installed in two households respectively. The forward installation is set to left-in and right-out, and the reverse installation is set to right-in and left-out. The gas leakage content threshold is set to: According to the reverse gas content detected by the two gas meters A and B, they are: , if the reverse gas flow content is lower than the set threshold, the two gas meters are installed in the forward direction; the normal range of ultrasonic signal propagation speed obtained from the database during the time period when the user does not use gas is 340m / s-345m / s; the normal range of ultrasonic signal propagation speed during the time period when the user uses gas is 430m / s-435m / s;

[0070] The gas meter A is in a time period when the user does not use gas. The propagation speed of the ultrasonic signal in the gas meter A is detected to be 343.5m / s, which is within the normal range. Therefore, the gas meter A passes the anti-disassembly test;

[0071] The gas meter B is in the time period when the user uses gas. The propagation speed of the ultrasonic signal in the gas meter B is detected to be 445m / s, which is not within the normal range. The gas meter B fails the anti-disassembly test and the valve is immediately closed and the alarm signal 2 is issued;

[0072] In ultrasonic gas meter B, the upstream sensor and the downstream sensor are set, the gas propagation path is marked as 0.2m, the angle between the propagation path and the horizontal plane is marked as 60°; the propagation speed of the sound wave in the static state of the medium is marked as 340m / s; the average axial flow velocity of the fluid is marked as 10m / s;

[0073] By formula The downstream time from the upstream sensor to the downstream sensor is calculated to be ;

[0074] By formula The calculated backflow time from the downstream sensor to the upstream sensor is ;

[0075] By formula The calculated gas velocity is 11.89 m / s; the flow area is marked as ;

[0076] By formula The actual gas flow in gas meter B is calculated as .

[0077] See also Figure 3 , the specific steps of data calibration are: obtain the user's non-gas usage time period from the database, turn on the small flow self-check mode of the gas meter; determine whether there is an instantaneous flow exceeding the set content threshold during the non-gas usage time period; if so, record the duration of the instantaneous flow; if not, there is no small flow leakage in the gas meter; determine whether the duration of the instantaneous flow exceeds the set time threshold; if so, there is a small flow leakage in the gas meter, and issue an early warning signal; if not, there is no small flow leakage in the gas meter, and obtain the recorded value of the real-time gas flow in the gas meter from the database;

[0078] Mark the recorded values ​​in the gas meter as , and retrieve the actual gas flow ;

[0079] By formula Calculate the difference; determine whether the difference is less than 0; if yes, issue a reminder signal and ask the staff to perform maintenance; if no, take the difference as the change value one;

[0080] Set a collection interval, and obtain real-time data from several gas meters according to the collection interval; the real-time data includes: temperature data and pressure data;

[0081] Set the real-time temperature change to A (°C), then the change value is a% of the recorded value;

[0082] If the pipeline pressure changes by B (kpa), the change value is b% of the recorded value;

[0083] Sum the change values ​​1, 2, and 3 to get the average value, take the average value as the error value and mark the error value as ; Through the formula Calculate the corrected gas value.

[0084] For example, retrieve the non-gas-using time period of the user in gas meter B, turn on the small flow self-check mode of the gas meter; set the content threshold of the flow in the non-gas-using time period to 1.2Qmax; now through self-check, it is found that the highest instantaneous flow of the content threshold in the non-gas-using time period is 0.8Qmax; there is no instantaneous flow exceeding the set content threshold in the non-gas-using time period, so there is no small flow leakage in the gas meter;

[0085] The real-time gas flow record value obtained from the database is ;

[0086] By formula The calculated difference is ; Since the difference 0.117>0, the difference is taken as the change value one;

[0087] If the real-time temperature changes by 3°C, the second change value is 1% of the recorded value; if the pipeline pressure changes by 0.5kpa, the third change value is 3% of the recorded value;

[0088] Set the collection interval to 1 hour, and obtain real-time data from several gas meters according to the collection interval;

[0089] Among them, only one of the real-time temperatures in several gas meters increases by 3°C in the adjacent collection interval, then the change value is ; The real-time pressure values ​​in several gas meters did not change;

[0090] According to the formula The calculated error value is ;

[0091] By formula The corrected gas value is calculated as .

[0092] It should be noted that, if the real-time temperature change is set to A (℃), the change value two is a% of the recorded value; if the pipeline pressure changes to B (kpa), the change value three is b% of the recorded value, where A corresponds to a unique a, and B corresponds to a unique b; a change in A will cause a corresponding change in a, and a change in B will cause a corresponding change in b; the specific change values ​​are determined by the staff in this field according to the actual operating conditions.

[0093] See also Figure 4 , the second aspect of the present invention provides an ultrasonic gas meter measurement data optimization system, including: an equipment inspection module, a data calibration module, a safety monitoring module, and a user interface module;

[0094] Equipment inspection module: obtain the gas meter distribution map from the database, install the ultrasonic gas meter according to the distribution map; determine whether the ultrasonic gas meter is installed in the forward direction; if yes, perform anti-dismantling detection on the ultrasonic gas meter; if no, immediately close the valve and issue an alarm signal 1; determine whether the ultrasonic gas meter passes the anti-dismantling detection; if yes, calculate the actual gas flow by measuring the ultrasonic signal; if no, immediately close the valve and issue an alarm signal 2;

[0095] Data calibration module: Determine whether there is a small flow leakage in the gas meter; if yes, issue a warning message; if no, obtain the recorded value of the real-time gas flow in the gas meter from the database; calculate the error value through the recorded value in the gas meter and the actual gas flow; calibrate the gas meter according to the error value;

[0096] Safety monitoring module: determines whether the actual gas usage after error correction meets the safety gas usage standards; if yes, the data optimization of the gas meter is completed; if no, a reminder signal is issued;

[0097] User interface module: used to display alarm signals and various data; the alarm signals include: alarm signal 1, alarm signal 2, early warning signal, reminder signal and repair signal; the various data include: actual gas flow, real-time gas flow record value, error value and corrected gas meter record value.

[0098] Part of the data in the above formula is calculated by removing the dimension and taking its numerical value. The formula is a formula closest to the actual situation obtained by software simulation of a large amount of collected data; the preset parameters and preset thresholds in the formula are set by technical personnel in this field according to actual conditions or obtained through simulation of a large amount of data.

[0099] Working principle of the present invention: The present invention determines whether the ultrasonic gas meter is installed in the forward direction and performs anti-dismantling detection on the ultrasonic gas meter; determines whether the ultrasonic gas meter passes the anti-dismantling detection and calculates the actual gas flow by measuring the ultrasonic signal; determines whether there is a small flow leakage in the gas meter; if yes, a warning signal is issued; if no, the recorded value of the real-time gas flow in the gas meter is obtained from the database; the error value is calculated by the recorded value in the gas meter and the actual gas flow; the gas meter is corrected according to the error value; determines whether the actual gas usage after the error correction meets the safety gas usage standard; if yes, the data optimization of the gas meter is completed; if no, a reminder signal is issued.

[0100] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A method for optimizing ultrasonic gas meter measurement data, characterized in that: Step S100: Obtain a gas meter distribution map from a database, and install an ultrasonic gas meter according to the distribution map; determine whether the ultrasonic gas meter is installed in the forward direction; if yes, perform an anti-disassembly test on the ultrasonic gas meter; if no, immediately close the valve and issue an alarm signal 1; determine whether the ultrasonic gas meter passes the anti-disassembly test; if yes, calculate the actual gas flow by measuring the ultrasonic signal; if no, immediately close the valve and issue an alarm signal 2; Step S200: determine whether there is a small flow leakage in the gas meter; if yes, issue a warning signal; if no, obtain the recorded value of the real-time gas flow in the gas meter from the database; calculate the error value by the recorded value in the gas meter and the actual gas flow; calibrate the gas meter according to the error value; Step S300: determining whether the actual gas usage after error correction meets the safety gas usage standard; yes , then the data optimization of the gas meter is completed; If not, a reminder signal is issued; The method of determining whether there is a small flow leakage in the gas meter includes: Obtain the user's non-gas usage time period from the database, and turn on the small flow self-check mode of the gas meter; determine whether there is an instantaneous flow exceeding the set content threshold during the non-gas usage time period; if so, record the duration of the instantaneous flow; if not, there is no small flow leakage in the gas meter; determine whether the duration of the instantaneous flow exceeds the set time threshold; if so, there is a small flow leakage in the gas meter; if not, there is no small flow leakage in the gas meter; The method of correcting the gas meter according to the error value includes: Retrieve the recorded value JZ and the error value E, and calculate the corrected gas value using the formula JR=JZ-E; determine whether the gas meter is functioning normally; if so, adjust the recorded value in the gas meter to the corrected gas value; if not, send out a repair signal; the functions of the gas meter include: the dial rotates normally and the pointer points correctly.

2. The method for optimizing ultrasonic gas meter measurement data according to claim 1, characterized in that: The step of determining whether the ultrasonic gas meter is installed in the forward direction includes: Set the specific directions of forward installation and reverse installation to determine whether the reverse gas leakage content of the gas meter is lower than the set threshold; if yes, the gas meter is forward installed; if no, determine whether the duration of reverse gas leakage exceeds the set time; if yes, the gas meter is reverse installed; if no, the gas meter is forward installed.

3. The method for optimizing ultrasonic gas meter measurement data according to claim 1, characterized in that: The step of judging whether the ultrasonic gas meter passes the anti-disassembly detection comprises: Obtain the normal range of ultrasonic signal propagation speed at different times from the database; record the ultrasonic signal propagation speed at different times through the ultrasonic gas meter; determine whether the ultrasonic signal propagation speed in the ultrasonic detection meter is within the normal range; if yes, the ultrasonic gas meter passes the anti-dismantling test; if no, the ultrasonic gas meter fails the anti-dismantling test; wherein the different times include: the time when the user uses gas, and the time when the user does not use gas.

4. The method for optimizing ultrasonic gas meter measurement data according to claim 1, characterized in that: The method of calculating the actual gas flow rate by measuring the ultrasonic signal includes: In the ultrasonic gas meter, an upstream sensor and a downstream sensor are set, the gas propagation path is marked as L(m), the angle between the propagation path and the horizontal plane is marked as θ, and the propagation speed of the sound wave in the static state of the medium is marked as ; The average axial velocity of the fluid is marked as ; By formula Calculate the downstream flow time from the upstream sensor to the downstream sensor; By formula Calculate the backflow time from the downstream sensor to the upstream sensor; By formula The gas flow rate is calculated; Mark the flow area as A; By formula Calculate the actual gas flow.

5. The method for optimizing ultrasonic gas meter measurement data according to claim 1, characterized in that: The error value is calculated by using the recorded value in the gas meter and the actual gas flow, including: Mark the recorded value in the gas meter as JZ and retrieve the actual gas flow ; By formula Calculate the difference; determine whether the difference is less than 0; if yes, issue a reminder signal and ask the staff to perform maintenance; if no, take the difference as the change value one; Set a collection interval, and obtain real-time data from several gas meters according to the collection interval; the real-time data includes: temperature data and pressure data; Set the real-time temperature change A, then the change value is a% of the recorded value; If the pipeline pressure changes by B, the change value is b% of the recorded value; The change values ​​1, 2, and 3 are summed up to obtain an average value, the average value is taken as the error value and the error value is marked as E.

6. The method for optimizing ultrasonic gas meter measurement data according to claim 1, characterized in that: The determining whether the actual gas usage after error correction meets the safe gas usage standard includes: Retrieve the calibrated gas meter record value to determine whether the calibrated gas meter record value exceeds the gas usage upper limit; if so, the actual gas usage does not meet the safe gas usage standard; if not, determine whether the gas meter record value is higher than the instantaneous excess flow threshold; if so, the actual gas usage does not meet the safe gas usage standard; if not, the actual gas usage meets the safe gas usage standard.

7. An ultrasonic gas meter measurement data optimization system, applied to an ultrasonic gas meter measurement data optimization method according to any one of claims 1 to 6, characterized in that: include: Equipment inspection module, data calibration module, security monitoring module, user interface module; Equipment inspection module: obtain the gas meter distribution map from the database, install the ultrasonic gas meter according to the distribution map; determine whether the ultrasonic gas meter is installed in the forward direction; if yes, perform anti-dismantling detection on the ultrasonic gas meter; if no, immediately close the valve and issue an alarm signal 1; determine whether the ultrasonic gas meter passes the anti-dismantling detection; if yes, calculate the actual gas flow by measuring the ultrasonic signal; if no, immediately close the valve and issue an alarm signal 2; Data calibration module: determines whether there is a small flow leakage in the gas meter; if so, it issues an early warning message; If not, then obtain the recorded value of the real-time gas flow in the gas meter from the database; calculate the error value through the recorded value in the gas meter and the actual gas flow; and calibrate the gas meter according to the error value; Safety monitoring module: determines whether the actual gas usage after error correction meets the safety gas usage standards; if yes, completes the data optimization of the gas meter; if not, issues a reminder signal.

8. The ultrasonic gas meter measurement data optimization system according to claim 7, characterized in that: The system also includes: a user interface module: used to display alarm signals and various data; wherein the alarm signals include: alarm signal one, alarm signal two, early warning signal, reminder signal and repair signal; various data include: actual gas flow, real-time gas flow record value, error value and corrected gas meter record value.

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