Method for determining flowing state of medium in pipeline for ultrasonic gas meter

Abstract

The utility model discloses a method for determining the flowing state of a medium in a pipeline for an ultrasonic gas meter. Pressure sensors are installed at the positions of a measuring pipe section of the ultrasonic gas meter adjacent to an inlet and an outlet, and used for monitoring the pressure difference between the inlet and the outlet of the ultrasonic gas meter in real time, and according to the physical phenomenon that the pressure difference generated after the medium flows through a flow resistance element in the fluid mechanics is proportional to the square of flow rate of medium, whether the medium in the pipeline is in a flowing state or dead state is judged according to the measured pressure difference and the change conditions. The method is used for the ultrasonic gas meter, and can provide a quick switching command for the ultrasonic gas meter under both the standby mode and the measuring mode, thereby effectively prolonging the service life of the battery for the ultrasonic gas meter; in addition, the method can provide a selection basis of correction time for real-time zero correction of the ultrasonic gas meter.

Description

technical field [0001] The invention relates to a method for determining the flow state of a medium in a pipeline, in particular to a method for determining the flow state of a medium in a pipeline for an ultrasonic gas meter. Background technique [0002] Compared with traditional membrane gas meters, ultrasonic gas meters have become an important development direction in the field of urban gas metering because of their advantages of higher measurement accuracy, better reliability, and lower pressure loss. At present, ultrasonic gas meters are generally powered by built-in batteries, which generally require a battery life of more than 5-6 years. If the battery of the ultrasonic gas meter is exhausted, the gas company or the user needs to replace the new battery in time, otherwise the measurement cannot be continued. Therefore, the battery life has always been an important performance indicator of ultrasonic gas meter products, and a longer battery life can reduce the use a...

AI Technical Summary

Problems solved by technology

If the interval is long, although the power consumption is reduced, the response is slow, and the flow measurement cannot be performed in time when the pipeline gas valve is opened.

If the interval is shorter, although the response becomes faster, the power consumption of the gas meter will naturally increase due to frequent entry into the working mode

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