Method for improving flow measurement error consistency of time difference type ultrasonic heat meter

Abstract

The invention discloses a method for improving the flow measurement error consistency of a time difference type ultrasonic heat meter. The method comprises the steps that the moment of valve opening or closing is accurately judged by monitoring the change of original sampling data delta T of the propagation time difference of ultrasound at the moment of valve opening or closing in fair current and adverse current in water during measuring; meanwhile, main cumulative flow data and temporary cumulative flow data are introduced, only temporary cumulative flow which is really measured through judgment will be supplemented into main cumulative flow, or else, the temporary cumulative flow is abandoned, in this way, the accuracy of the cumulative volume which is metered in the whole measuring process is guaranteed, and additional metering is avoided. According to the method, it can be guaranteed that metering errors will not jump, and therefore the flow error consistency is improved. Besides, the problem that the flow errors are prone to jump on different detection tables, and that is, the error consistency is poor due to the influence by the detection tables is solved.

Description

technical field [0001] The invention relates to a method for improving the flow measurement error consistency of a transit-time ultrasonic heat meter. Background technique [0002] At present, the flow measurement errors of different ultrasonic heat meters are different. The main reason is that the time and strength of the various testing platforms switch valves are different. In the process of opening and closing the valve, it is easy to produce water hammer phenomenon, resulting in changes in the flow field when the valve is opened and closed, and even backflow, so that the exact moment of opening or closing the valve cannot be correctly judged, resulting in flow The measurement is inaccurate, resulting in over-metering; resulting in jumps in errors, which affect the accuracy of flow measurement and reduce the consistency of errors. Contents of the invention [0003] The purpose of the present invention is to provide a method for improving the flow measurement error con...

AI Technical Summary

Problems solved by technology

In the process of opening and closing the valve, it is easy to produce water hammer phenomenon, resulting in changes in the flow field when the valve is opened and closed, and even backflow, so that the exact moment of opening or closing the valve cannot be correctly judged, resulting in flow The measurement is inaccurate, resulting in over-metering; resulting in jumps in errors, affecting the accuracy of flow measurement and reducing the consistency of errors

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