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Method of Improving the Consistency of Flow Measurement Error of Time-Difference Ultrasonic Heat Meter

A flow measurement and ultrasonic technology, which is applied in the field of improving the flow measurement error consistency of the time difference ultrasonic heat meter, can solve the problems of reducing the error consistency, inaccurate flow measurement, and generating backflow, etc., so as to avoid multiple meters, ensure accuracy, The effect of improving consistency

Active Publication Date: 2017-03-08
HUNAN WEIMING ENERGY TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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

Method used

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  • Method of Improving the Consistency of Flow Measurement Error of Time-Difference Ultrasonic Heat Meter
  • Method of Improving the Consistency of Flow Measurement Error of Time-Difference Ultrasonic Heat Meter
  • Method of Improving the Consistency of Flow Measurement Error of Time-Difference Ultrasonic Heat Meter

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Embodiment Construction

[0023] Such as figure 1 As shown, the present invention is mainly suitable for the flow measurement of the transit-time ultrasonic heat meter: a pair of ultrasonic transducers are used to send and receive ultrasonic waves alternately (or at the same time), and the fluid is indirectly measured by observing the time difference of the forward and reverse flow of the ultrasonic waves in the medium The flow rate, and then calculate the flow rate by the flow rate.

[0024] The transit-time flow measurement method first obtains the relevant time data according to the following formula.

[0025]

[0026]

[0027]

[0028] In the formula, L 1 is the propagation length of the sound wave between two reflecting surfaces in the liquid; L 2 is the propagation length of the sound wave in the liquid between the reflecting surface and the transducer; D is the inner diameter of the pipe; C is the speed of the sound wave propagating in the liquid at rest; V is the average flow velocit...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F25/00
Inventor 黄深喜张慧娟蒋灿
Owner HUNAN WEIMING ENERGY TECH CO LTD
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