Gas stealing prevention detection method for ultrasonic detection metering device and gas meter

Abstract

The invention provides a gas stealing prevention detection method for an ultrasonic detection metering device and a gas meter. The gas stealing prevention detection method comprises the following steps: instantaneous flow values of gas detected by the metering device in a first detection mode and a second detection mode are acquired respectively; the detection frequency in the second detection mode is higher than that in the first detection mode, and the detection frequency in the second detection mode is higher than the switching frequency of the electromagnetic valve; the instantaneous flowvalue obtained in the first detection mode is compared with the instantaneous flow value obtained in the second detection mode, and when the difference value between the two instantaneous flow valuesis larger than a set threshold value, it is determined that a user has a gas stealing behavior; and when the difference value of the two is smaller than the set threshold value, it is determined thatthe user does not have the gas stealing behavior. According to the ultrasonic gas meter, judgment and program optimization are conducted against gas stealing behaviors possibly occurring in the use process of a user, and when it is found that the user has suspected gas stealing behaviors, the gas meter gives an alarm prompt.

Description

technical field [0001] The invention relates to the field of gas measurement, in particular to an anti-theft gas detection method and a gas meter used in an ultrasonic detection and measurement device. Background technique [0002] At present, the use of ultrasonic detection technology to detect the instantaneous flow of gas is widely used in gas medium flow measurement, and in gas measurement, ultrasonic gas meters and gas ultrasonic flowmeters are all used for measurement based on the principle of ultrasonic detection technology. In order to prevent the phenomenon of stealing gas, the ultrasonic detection technology adopts high-frequency mode measurement. The switch of the current solenoid valve cannot achieve this high-frequency switching. However, in the actual use process, high-frequency measurement consumes a lot of power, and the metering device does not The battery may be replaced frequently. Due to this limitation, ultrasonic testing cannot always work in high-frequ...

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Problems solved by technology

[0004] At present, there have been gas theft behaviors on the market based on the working principle of the above-mentioned ultrasonic detection. A solenoid valve is installed in the gas flow pipeline, and the solenoid valve is controlled to switch on and off synchronously with the same time period, that is, when the ultrasonic gas meter starts to measure the instantaneous flow, the solenoid valve is closed instantly, so that the measured flow is far away. Far less than the actual flow value; when the ultrasonic gas meter finishes detecting the instantaneous flow, the solenoid valve opens to meet the pressure and flow requirements for normal ventilation of the pipeline; after the accumulation of time, the cumulative flow of the ultrasonic gas meter will be far It is smaller than the actual gas flow and achieves the purpose of stealing gas, which has a huge impact on the normal measurement of gas companies, and at the same time poses new challenges to gas meter manufacturers

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