Multi-channel ultrasonic gas meter combined metering system

Abstract

The invention discloses a multi-channel ultrasonic gas meter combined metering system, and relates to the technical field of gas metering, the multi-channel ultrasonic gas meter combined metering system comprises a gas flow information storage module, the gas flow information storage module comprises initial gas use peak period circulation duration information and initial gas use peak period circulation amount information in a channel; the initial fuel gas use peak period circulation information comprises winter fuel gas circulation information and summer fuel gas circulation information; the fuel gas flow information acquisition module comprises fuel gas use peak period flow information and fuel gas use non-peak period flow information, and the fuel gas use peak period flow information comprises fuel gas use peak period circulation duration information and fuel gas use peak period circulation amount information; the device has the advantages that a worker can be helped to rapidly check the fault position of the gas main channel, the difficulty of checking the gas main channel by the worker is reduced, and therefore the working efficiency of the worker is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas metering, and more specifically, to a multi-channel ultrasonic gas meter combined metering system. Background Art

[0002] Gas stoves, gas water heaters and other equipment have become necessities of life and are increasingly entering thousands of households. However, with the popularization of gas appliances, during the use of gas, the circulation and usage of gas is usually measured and monitored through gas meters.

[0003] However, after the existing ultrasonic gas meter combination metering system monitors the gas flow in the channel, it transmits the monitoring information to the terminal server for recording and storage. However, due to the different purity of the gas, it contains different amounts of impurities. After the long-term use of the gas channel, some impurities contained in the gas will be precipitated in the channel, resulting in a decrease in the volume of the channel, thereby affecting the gas flow and the normal use of the end users. At the same time, after the user feedbacks the situation to the relevant gas management personnel, the gas management personnel arrange for the gas channel maintenance staff to conduct inspections and troubleshooting, which not only affects the user's use, but also because the main gas channel is long and there are many branch channels on the main channel, which increases the difficulty of the staff to check the channel. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a multi-channel ultrasonic gas meter combined metering system.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] Multi-channel ultrasonic gas meter combined metering system, including:

[0007] A gas flow information storage module, the gas flow information storage module includes initial gas usage peak period flow duration information and initial gas usage peak period flow volume information in the channel, the initial gas usage peak period flow volume information includes winter gas flow volume information and summer gas flow volume information;

[0008] A gas flow information collection module, wherein the gas flow information collection module includes gas flow information during peak usage and gas flow information during off-peak usage, wherein the gas flow information during peak usage includes gas flow duration information during peak usage and gas flow volume information during peak usage, and the gas flow information during off-peak usage includes gas flow duration information during off-peak usage and gas flow volume information during off-peak usage;

[0009] A gas flow information processing module, wherein the gas flow information processing module is used to compare the gas usage peak period flow information with the initial gas usage peak period flow information. If the gas usage peak period flow information is greater than the initial gas usage peak period flow information, and the gas usage non-peak period flow information is smaller or has a value of 0, it can be determined that the client's gas usage has increased; if the gas usage peak period flow information is greater than the initial gas usage peak period flow information, and the gas usage non-peak period flow information is larger, it can be determined that a gas leak has occurred, and maintenance personnel need to be arranged to inspect the channel.

[0010] Preferably, the user-side initial gas flow information is set as the initial gas usage peak period flow information, and the initial gas usage peak period flow information is marked and valuated to obtain the peak period gas usage initial flow total value RQZ;

[0011] The initial gas flow information used by the user end in summer is set as the initial gas flow information during the peak period in summer, and the initial gas flow information during the peak period in summer is marked and valuated to obtain the total value of the initial gas flow RQZX in summer;

[0012] The initial gas flow information used by the user end in winter is set as the initial gas usage peak flow information in winter, and the initial gas usage peak flow information in winter is marked and valuated to obtain the total initial gas usage flow value RQZD in winter.

[0013] Preferably, the initial gas usage peak period circulation duration information is marked as a gas usage peak period, and the gas usage peak period includes a first usage time, a second usage period, and a third usage period;

[0014] The first usage period is a gas usage peak node in the morning, and the preset duration threshold of the first usage period is: [P1, P2];

[0015] The second usage period is the peak gas usage node at noon, and the preset duration threshold of the second usage period is: [P3, P4];

[0016] The third usage period is the peak gas usage period at night, and the preset duration threshold of the third usage period is: [P5, P6];

[0017] The remaining time periods are off-peak time periods for gas usage, and the off-peak flow volume thresholds for the off-peak flow volume information for gas usage are preset as [F1, F2].

[0018] Preferably, the gas usage peak flow value is marked and valuated to obtain a first total gas usage value RSY;

[0019] The off-peak flow value of gas usage is marked and valuated to obtain a second total value FSY of gas usage.

[0020] Preferably, during the peak period of gas usage in summer, when the total initial flow rate of gas usage in summer RQZX is less than the first total flow rate of gas usage RSY, the second total flow rate of gas usage FSY is compared with the off-peak flow rate threshold value [F1, F2];

[0021] If the off-peak flow threshold F1 < the second total value of gas usage FSY ≤ the off-peak flow threshold F2, it can be determined that the gas usage at the user end has increased. If the channel volume is limited, a reserve channel can be added;

[0022] If the off-peak flow rate threshold F2 is less than the second total value FSY of gas usage, it can be determined that there is a gas leakage in the gas channel, and maintenance personnel can be notified to inspect the gas channel.

[0023] Preferably, if the total value of the initial flow rate of gas usage in summer RQZX is less than the first total value of gas usage RSY, and the first usage period preset time threshold P2 or the second usage period preset time threshold P4 or the third usage period preset time threshold P6 is less than or equal to the gas usage time, it can be determined that the client usage time has increased. If the usage time increases for multiple consecutive times, it is necessary to change the first usage period preset time threshold and the second usage period preset time threshold;

[0024] If the total initial flow rate of gas usage in summer RQZX is less than the first total gas usage value RSY, and the preset time threshold P1 of the first usage period or the preset time threshold P3 of the second usage period or the preset time threshold P5 of the third usage period ≥ the gas usage time, it can be determined that there is a gas leakage in the gas transmission channel, and it is necessary to notify the gas channel maintenance personnel to inspect the gas channel.

[0025] Preferably, if the total value of the initial flow rate of gas usage in summer RQZX>the first total value of gas usage RSY, and the first usage period preset time threshold P2 or the second usage period preset time threshold P4 or the third usage period preset time threshold P6≤gas usage time, it can be determined that the gas channel is blocked, and it is necessary to notify the gas channel maintenance personnel to inspect the gas channel;

[0026] If the total initial flow rate of gas usage in summer RQZX is greater than the first total value of gas usage RSY, and the preset time threshold P1 of the first usage period or the preset time threshold P3 of the second usage period or the preset time threshold P5 of the third usage period ≥ the gas usage time, it can be judged that the client usage time is reduced. If the usage time is reduced for multiple consecutive times, it is necessary to change the preset time threshold of the first usage period and the preset time threshold of the second usage period.

[0027] Preferably, during the winter gas usage peak period, when the winter gas usage initial flow total value RQZD < the gas usage first total value RSY, the gas usage second total value FSY is compared with the off-peak flow threshold value [F1, F2];

[0028] If the off-peak flow threshold F1 < the second total value of gas usage FSY < the off-peak flow threshold F2, it can be determined that the gas usage at the user end is reduced;

[0029] If the second total value of gas usage FSY ≤ the off-peak flow threshold F1, it can be determined that the gas passage is blocked. At this time, the maintenance personnel can be notified to clear the gas passage.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. In the present invention, the gas flow rate and flow duration in the gas channel are monitored by ultrasonic sensors, and the monitoring information is transmitted to the terminal server. Two adjacent ultrasonic sensors are correlated with each other to compare the gas flow rate information in two adjacent branch channels, so that the staff can check the faulty parts of the main channel and the branch channels one by one.

[0032] 2. In the present invention, by comparing the gas flow conditions in multiple branch channels, it can help staff to quickly find the fault location of the main gas channel, reduce the difficulty of staff to find the gas channel, and thus improve the work efficiency of staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A module schematic diagram of a multi-channel ultrasonic gas meter combined metering system is proposed for the present invention. DETAILED DESCRIPTION

[0034] Reference Figure 1 .

[0035] Embodiment 1 further describes the multi-channel ultrasonic gas meter combined metering system proposed by the present invention.

[0036] The multi-channel ultrasonic gas meter combined metering system is characterized by comprising:

[0037] A gas flow information storage module, wherein the gas flow information storage module includes initial gas usage peak period flow duration information and initial gas usage peak period flow volume information in the channel, wherein the initial gas usage peak period flow volume information includes winter gas flow volume information and summer gas flow volume information.

[0038] A gas flow information collection module, the gas flow information collection module includes gas flow information during peak usage and gas flow information during non-peak usage, the peak gas flow information includes gas flow duration information during peak usage and gas flow volume information during peak usage, the non-peak gas flow information includes gas flow duration information during non-peak usage and gas flow volume information during non-peak usage.

[0039] A gas flow information processing module, wherein the gas flow information processing module is used to compare the gas usage peak period flow information with the initial gas usage peak period flow information. If the gas usage peak period flow information is greater than the initial gas usage peak period flow information, and the gas usage non-peak period flow information is smaller or has a value of 0, it can be determined that the client's gas usage has increased; if the gas usage peak period flow information is greater than the initial gas usage peak period flow information, and the gas usage non-peak period flow information is larger, it can be determined that a gas leak has occurred, and maintenance personnel need to be arranged to inspect the channel.

[0040] It should be noted that since the gas is transported to the user end through multiple branch channels in the main gas channel, ultrasonic sensors need to be installed in multiple gas channels to monitor the gas flow rate and circulation duration in the gas channels, and transmit the monitoring information to the terminal server. Two adjacent ultrasonic sensors are correlated with each other to compare the gas flow rate information in two adjacent branch channels, so that the staff can check the faulty parts of the main channel and the branch channels one by one.

[0041] For example, the main channel located in the front section of the first branch channel is marked as the first section of the main channel, the main channel part between the first branch channel and the second branch channel is marked as the second section of the main channel, the main channel part between the second branch channel and the third branch channel is marked as the third section of the main channel, and so on, the main channel part between the nth branch channel and the n+1th branch channel is marked as the n+1th section of the main channel.

[0042] If the gas flow rates in the first branch channel, the second branch channel, the third branch channel, and the n+1th branch channel are all relatively small during the peak period of gas usage, it can be determined that the main channel in the front section of the first branch channel, i.e., the first section of the main channel, is blocked. At this time, the staff can clear the first section of the main channel based on this information. If the gas flow rate in the first branch channel is large during the peak period of gas usage, while the gas flow rates in the second branch channel, the third branch channel, and the n+1th branch channel are all relatively small, it can be determined that the main channel between the first branch channel and the second branch channel, i.e., the second section of the main channel, is blocked. At this time, the staff can clear the second section of the main channel based on this information. Similarly, it can help the staff to quickly identify the faulty parts of the gas main channel, thereby improving the staff's work efficiency.

[0043] The user-side initial gas flow information is set as the initial gas usage peak period flow information, and the initial gas usage peak period flow information is marked and valuated to obtain the peak period gas usage initial flow total value RQZ;

[0044] The initial gas flow information used by the user end in summer is set as the initial gas flow information during the peak period in summer, and the initial gas flow information during the peak period in summer is marked and valuated to obtain the total value of the initial gas flow RQZX in summer;

[0045] The initial gas flow information used by the user end in winter is set as the initial gas usage peak flow information in winter, and the initial gas usage peak flow information in winter is marked and valuated to obtain the total initial gas usage flow value RQZD in winter.

[0046] It should be noted that due to the different demand for gas in summer and winter, for example, in summer, due to the hot weather, the demand for hot water is relatively small. For example, when using gas water heaters, the water temperature is adjusted relatively low, so the gas consumption is small and residents' gas usage is reduced. In winter, due to the relatively large demand for hot water, for example, using gas water heaters and using boilers to provide heating, the gas consumption is relatively large. At this time, residents' gas usage increases. Therefore, the total initial flow rate of gas usage in summer RQZX is less than the total initial flow rate of gas usage in winter RQZD.

[0047] The initial gas usage peak period circulation duration information is marked as a gas usage peak time period, and the gas usage peak time period includes a first usage time, a second usage time period, and a third usage time period.

[0048] The first usage period is the peak gas usage node in the morning, and the preset duration threshold of the first usage period is: [P1, P2].

[0049] The second usage period is the peak gas usage node at noon, and the preset duration threshold of the second usage period is: [P3, P4].

[0050] The third usage period is the peak gas usage node in the evening, and the preset duration threshold of the third usage period is: [P5, P6].

[0051] The remaining time periods are off-peak time periods for gas usage, and the off-peak flow volume thresholds for the off-peak flow volume information for gas usage are preset as [F1, F2].

[0052] It should be noted that the peak time period for gas usage is the time node used by residential users. For example, the first usage period is the morning gas usage peak node time, which is usually around 6-8 in the morning. The preset time threshold P1 for the first usage period is 6, and the preset time threshold F2 for the first usage period is 8; for example, the second usage period is the noon gas usage peak node time, which is usually around 11-2 in the afternoon. The preset time threshold P3 for the second usage period is 11, and the preset time threshold F4 for the second usage period is 2; for example, the third usage period is the evening gas usage peak node time, which is usually around 6-10 in the evening. The preset time threshold P5 for the third usage period is 6, and the preset time threshold F6 for the third usage period is 10.

[0053] During the peak period of gas usage, if the gas flow in the channel is abnormal in the first period, it is necessary to compare the gas flow in the channel in the second period with the total initial flow rate RQZ of the peak period. If the gas flow in the channel is still abnormal in the second period, it is necessary to compare the gas flow in the channel in the third period with the total initial flow rate RQZ of the peak period. If in the third period, the gas flow in the channel is equal to the total initial flow rate RQZ of the peak period or is around RQZ±0.5 of the total initial flow rate RQZ of the peak period, it can be determined that there is a deviation in the user's gas usage in the first and second periods.

[0054] If the gas flow in the channel is abnormal during the first, second and third usage periods, it is necessary to compare the gas flow in the branch channel with the gas flow in the adjacent branch channel. For example, the gas flow in the first, second and third usage periods is small. If the gas flow in the adjacent branch channel, i.e. the second branch channel, is large, it can be determined that the user end of the branch channel uses less gas. If the gas flow in the second branch channel is also small, it is necessary to compare the gas flow in the second branch channel with the gas flow in the third branch channel. If the gas flow in the third branch channel is large, it can be determined that the user end of the branch channel uses less gas. If the gas flow rate is relatively large, it can be determined that the amount of gas used by the user end of the second branch channel has decreased. If the gas flow rate in the third branch channel is relatively small, it is necessary to compare the gas flow rate in the third branch channel with that in the fourth branch channel, and so on. If the gas flow rate in the first branch channel, the second branch channel and the n+1th branch channel is still small, it can be determined that the main channel is blocked. The first branch channel begins to appear due to abnormal reasons. Therefore, it can be determined that the blockage is located in the main channel in the front section of the first branch channel, that is, the first section of the main channel. At this time, the staff can clear the first section of the main channel based on the information.

[0055] If abnormal gas flow in the channel occurs in the first, second and third usage periods, and the gas flow in the first branch channel is normal, and the gas flow in the second branch channel and the n+1th branch channel is still small, it can be determined that the main channel is blocked. The second branch channel begins to appear due to the abnormal reason, so it can be determined that the blocked part is located in the main channel between the first branch channel and the second branch channel, that is, the second section of the main channel. At this time, the staff can clear the first section of the main channel based on the information, and so on. This will make it easier for the staff to find the blocked part of the gas main channel and clear the corresponding blocked part of the main channel.

[0056] The gas usage peak flow value is marked and valuated to obtain a first total value RSY of gas usage.

[0057] The off-peak flow value of gas usage is marked and valuated to obtain a second total value FSY of gas usage.

[0058] During the peak gas usage period in summer, when the total initial gas usage flow value RQZX in summer is less than the first total gas usage value RSY, the second total gas usage value FSY is compared with the off-peak flow threshold value [F1, F2].

[0059] If the off-peak flow threshold F1 is less than the second total value of gas usage FSY and less than the off-peak flow threshold F2, it can be determined that the gas usage at the user end has increased. If the channel volume is limited, a spare channel can be added.

[0060] If the off-peak flow rate threshold F2 is less than the second total value FSY of gas usage, it can be determined that there is a gas leakage in the gas channel, and maintenance personnel can be notified to inspect the gas channel.

[0061] If the total initial flow rate of gas usage in summer RQZX is less than the first total gas usage value RSY, and the preset time threshold P2 of the first usage period or the preset time threshold P4 of the second usage period or the preset time threshold P6 of the third usage period ≤ the gas usage time, it can be judged that the client usage time has increased. If the usage time increases for multiple consecutive times, it is necessary to change the preset time threshold of the first usage period and the preset time threshold of the second usage period.

[0062] If the total initial flow rate of gas usage in summer RQZX is less than the first total gas usage value RSY, and the preset time threshold P1 of the first usage period or the preset time threshold P3 of the second usage period or the preset time threshold P5 of the third usage period ≥ the gas usage time, it can be determined that there is a gas leakage in the gas transmission channel, and it is necessary to notify the gas channel maintenance personnel to inspect the gas channel.

[0063] If the total initial flow rate of gas usage in summer RQZX> the first total value of gas usage RSY, and the preset duration threshold value P2 of the first usage period or the preset duration threshold value P4 of the second usage period or the preset duration threshold value P6 of the third usage period ≤ the gas usage duration, it can be determined that the gas channel is blocked, and it is necessary to notify the gas channel maintenance personnel to inspect the gas channel;

[0064] If the total initial flow rate of gas usage in summer RQZX is greater than the first total value of gas usage RSY, and the preset time threshold P1 of the first usage period or the preset time threshold P3 of the second usage period or the preset time threshold P5 of the third usage period ≥ the gas usage time, it can be judged that the client usage time is reduced. If the usage time is reduced for multiple consecutive times, it is necessary to change the preset time threshold of the first usage period and the preset time threshold of the second usage period.

[0065] During the winter gas usage peak period, when the winter gas usage initial flow total value RQZD < the gas usage first total value RSY, the gas usage second total value FSY is compared with the off-peak flow threshold value [F1, F2];

[0066] If the off-peak flow threshold F1 < the second total value of gas usage FSY < the off-peak flow threshold F2, it can be determined that the gas usage at the user end is reduced;

[0067] If the second total value of gas usage FSY ≤ the off-peak flow threshold F1, it can be determined that the gas passage is blocked. At this time, the maintenance personnel can be notified to clear the gas passage.

[0068] It should be noted that since the gas usage in winter is greater than that in summer, for example, when using a boiler for heating, the gas is in use 24 hours a day. Therefore, during the non-peak period of gas usage, the gas consumption is still very large. If the total value of the initial flow rate of winter gas usage in the first branch channel RQZD is less than the second total value of gas usage FSY, the gas flow in the first branch channel is abnormal. At this time, it is necessary to analyze the gas flow in the channel during the first usage period. If the total value of the initial flow rate of winter gas usage RQZD is less than the first total value RSY during the first usage period, it is necessary to analyze the gas flow in the channel during the second usage period. If In the second usage period, when the total value of the initial flow rate of winter gas usage RQZD is less than the first total value RSY, it is necessary to analyze the gas circulation in the channel during the third usage period. If, in the third usage period, the total value of the initial flow rate of winter gas usage RQZD is less than the first total value RSY, it is judged that the first branch channel is abnormal, and the staff is required to inspect the first branch channel to see if there is any gas leakage. If it is necessary to analyze the gas circulation in the channel during the first usage period, if in the first usage period, the total value of the initial flow rate of winter gas usage RQZD is greater than the first total value RSY, it can be judged that the gas demand at the user end of the first branch channel has increased.

[0069] Ultrasonic sensors are also provided at the corresponding parts of the main gas channel and the branch channels. The ultrasonic sensors monitor the gas flow in the main channel and transmit the monitoring information to the terminal server. When the main channel located in the front section of the first branch channel, that is, the first section of the main channel is in the non-peak period of gas use, if the non-peak flow threshold F1 is less than the second total value FSY and the non-peak flow threshold F2, and the non-peak flow threshold F2 in the second section of the main channel is less than the second total value FSY, then it is necessary to compare the gas flow of the second section of the main channel during the peak period of gas use. If the total value of the initial flow of winter gas use RQZD in the first period of use, the second period of use, and the third period of use is less than the first total value RSY, then the gas pipeline maintenance personnel can be notified to inspect the second section of the main channel to check whether there is a gas leak in the second main channel, so as to facilitate the staff to quickly determine the gas leak location in the gas channel.

[0070] Combine multiple small-flow ultrasonic metering modules to meet the metering requirements of large-flow ultrasonic gas meters;

[0071] In fact, 2 to 3 ultrasonic metering modules are connected in parallel to complete the measurement of large flow ultrasonic waves. The total measurement result is obtained by adding the measurement data of each ultrasonic metering module.

[0072] However, we also need to solve the problem of gas volume detection in the calibration mode: the ultrasonic module has a certain interval for measurement, so a sufficient amount of gas must be passed during the test to eliminate the detection error caused by the measurement interval. For example, the general 4-cubic meter is calibrated with a large flow volume of 400L, so that the test result is relatively stable. However, if we use two 4-cubic metering modules to complete the meter, and the large flow is still calibrated with 400L of ventilation, then the ventilation volume allocated to each metering module is only 200L. After the ventilation volume is reduced, the test result is unstable and it is easy to fail.

[0073] The invention of our design is that when multiple metering modules are spliced ​​together, an algorithm prediction is performed on the metering data of each module according to the flow rate at that time, and a pre-judgment interpolation is performed in the middle of the interval time, which is equivalent to reducing the metering interval time, thereby reducing the detection ventilation volume of the module. This ensures that the detection results are stable when multiple metering modules are spliced ​​together.

[0074] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. Multi-channel ultrasonic gas meter combined metering system, characterized in that: include: A gas flow information storage module, the gas flow information storage module includes initial gas usage peak period flow duration information and initial gas usage peak period flow volume information in the channel, the initial gas usage peak period flow volume information includes winter gas flow volume information and summer gas flow volume information; A gas flow information collection module, wherein the gas flow information collection module includes gas flow information during peak usage and gas flow information during off-peak usage, wherein the gas flow information during peak usage includes gas flow duration information during peak usage and gas flow volume information during peak usage, and the gas flow information during off-peak usage includes gas flow duration information during off-peak usage and gas flow volume information during off-peak usage; A gas flow information processing module, wherein the gas flow information processing module is used to compare the gas usage peak period flow information with the initial gas usage peak period flow information. If the gas usage peak period flow information is greater than the initial gas usage peak period flow information, and the gas usage non-peak period flow information is smaller or has a value of 0, it can be determined that the client's gas usage has increased; if the gas usage peak period flow information is greater than the initial gas usage peak period flow information, and the gas usage non-peak period flow information is larger, it can be determined that a gas leak has occurred, and maintenance personnel need to be arranged to inspect the channel.

2. The multi-channel ultrasonic gas meter combined metering system according to claim 1 is characterized in that: The user-side initial gas flow information is set as the initial gas usage peak period flow information, and the initial gas usage peak period flow information is marked and valuated to obtain the peak period gas usage initial flow total value RQZ; The initial gas flow information used by the user end in summer is set as the initial gas flow information during the peak period in summer, and the initial gas flow information during the peak period in summer is marked and valuated to obtain the total value of the initial gas flow RQZX in summer; The initial gas flow information used by the user end in winter is set as the initial gas usage peak flow information in winter, and the initial gas usage peak flow information in winter is marked and valuated to obtain the total initial gas usage flow value RQZD in winter.

3. The multi-channel ultrasonic gas meter combined metering system according to claim 2 is characterized in that: The initial gas usage peak period circulation time information is marked as a gas usage peak time period, and the gas usage peak time period includes a first usage time, a second usage time period, and a third usage time period; The first usage period is a peak gas usage period in the morning, and the preset duration threshold of the first usage period is: [P1, P2]; The second usage period is the peak gas usage node at noon, and the preset duration threshold of the second usage period is: [P3, P4]; The third usage period is the peak gas usage period at night, and the preset duration threshold of the third usage period is: [P5, P6]; The remaining time periods are off-peak time periods for gas usage, and the off-peak flow volume thresholds for the off-peak flow volume information for gas usage are preset as [F1, F2].

4. The multi-channel ultrasonic gas meter combined metering system according to claim 3 is characterized in that: Mark and take the gas usage peak flow value to obtain the first total value RSY of gas usage; The off-peak flow value of gas usage is marked and valuated to obtain a second total value FSY of gas usage.

5. The multi-channel ultrasonic gas meter combined metering system according to claim 4 is characterized in that: During the peak period of gas usage in summer, when the total initial flow rate of gas usage in summer RQZX is less than the first total flow rate of gas usage RSY, the second total flow rate of gas usage FSY is compared with the off-peak flow rate threshold value [F1, F2]; If the off-peak flow threshold F1 < the second total value of gas usage FSY ≤ the off-peak flow threshold F2, it can be determined that the gas usage at the user end has increased. If the channel volume is limited, a reserve channel can be added; If the off-peak flow rate threshold F2 is less than the second total value FSY of gas usage, it can be determined that there is a gas leakage in the gas channel, and maintenance personnel can be notified to inspect the gas channel.

6. The multi-channel ultrasonic gas meter combined metering system according to claim 5, characterized in that: If the total value of the initial flow rate of gas usage in summer RQZX is less than the first total value of gas usage RSY, and the preset duration threshold value P2 of the first usage period or the preset duration threshold value P4 of the second usage period or the preset duration threshold value P6 of the third usage period is less than or equal to the gas usage duration, it can be determined that the usage duration of the client has increased. If the usage duration increases for multiple consecutive times, it is necessary to change the preset duration threshold value of the first usage period and the preset duration threshold value of the second usage period; If the total initial flow rate of gas usage in summer RQZX is less than the first total gas usage value RSY, and the preset time threshold P1 of the first usage period or the preset time threshold P3 of the second usage period or the preset time threshold P5 of the third usage period ≥ the gas usage time, it can be determined that there is a gas leakage in the gas transmission channel, and it is necessary to notify the gas channel maintenance personnel to inspect the gas channel.

7. The multi-channel ultrasonic gas meter combined metering system according to claim 6, characterized in that: If the total initial flow rate of gas usage in summer RQZX> the first total value of gas usage RSY, and the preset duration threshold value P2 of the first usage period or the preset duration threshold value P4 of the second usage period or the preset duration threshold value P6 of the third usage period ≤ the gas usage duration, it can be determined that the gas channel is blocked, and it is necessary to notify the gas channel maintenance personnel to inspect the gas channel; If the total initial flow rate of gas usage in summer RQZX is greater than the first total value of gas usage RSY, and the preset time threshold P1 of the first usage period or the preset time threshold P3 of the second usage period or the preset time threshold P5 of the third usage period ≥ the gas usage time, it can be judged that the client usage time is reduced. If the usage time is reduced for multiple consecutive times, it is necessary to change the preset time threshold of the first usage period and the preset time threshold of the second usage period.

8. The multi-channel ultrasonic gas meter combined metering system according to claim 7, characterized in that: During the winter gas usage peak period, when the winter gas usage initial flow total value RQZD < the gas usage first total value RSY, the gas usage second total value FSY is compared with the off-peak flow threshold value [F1, F2]; If the off-peak flow threshold F1 < the second total value of gas usage FSY < the off-peak flow threshold F2, it can be determined that the gas usage at the user end is reduced; If the second total value of gas usage FSY ≤ the off-peak flow threshold F1, it can be determined that the gas passage is blocked. At this time, the maintenance personnel can be notified to clear the gas passage.

Images