Online monitoring method for metering performance of diaphragm gas meter

Abstract

The invention discloses an online monitoring method for metering performance of a diaphragm gas meter (containing a diaphragm meter). A magnetic rotary table in an electro-mechanical transformation device is reasonably segmented, and movement information of each sub-segment is recorded and analyzed; qualitative and quantitative judgment of metering errors, inner leakage judgment, outer leakage judgment and safety judgment of a constant flow speed of the diaphragm gas meter are realized. When gas with one rotary volume is discharged by the diaphragm gas meter, a rotary shaft of a movement rotates for one circle; the magnetic rotary table is directly engaged with a gear of output of an in-meter rotary shaft or an out-meter rotary shaft, so that when the gas with one rotary volume is discharged by the diaphragm gas meter, the magnetic rotary table rotates for one circle; the metering resolution ratio of the gas meter is greatly improved; specific pertinent property matching is carried outon equipment and intelligent analysis and judgment are carried out on the movement information of sub-segment, so that the qualitative and quantitative judgment of the metering errors, the inner leakage judgment, the outer leakage judgment and the safety judgment of the constant flow speed of the diaphragm gas meter are realized, and reliable guarantees are provided for active safety management for gas; the online monitoring method disclosed by the invention has important meanings in the aspects of error management of the diaphragm gas meter, intelligent control of gas users and safety management of gas utilization.

Description

technical field [0001] The invention relates to the technical field of gas metering, in particular to an online monitoring method for the metering performance of a membrane gas meter. Background technique [0002] The device for measuring gas is called gas meter (film meter) or gas flow meter, which is used to accumulate the volume or quality of gas passing through the pipeline. At present, most of the instruments used for household gas metering use membrane gas meters or smart gas meters based on membrane gas meters. These two types of meters do not have functions such as judging the performance degradation of the meter itself, and monitoring the leakage of gas in the internal cavity of the meter. However, with the increase of the service time of the gas meter, aging and frictional loss of the membrane and the slide valve of the watch core will cause problems such as increased movement stroke of the membrane, perforation of the membrane, poor seal between the slide valve a...

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Problems solved by technology

[0007] 1. Chinese patents CN 106248162 A and CN 206038080 U disclose a gas meter and its counter electromechanical conversion device. The electromechanical conversion device is installed on the top of the counter outside the gas meter, which mainly expands the width of the electromechanical conversion output pulse, and cannot really improve Resolution of electromechanical conversion

[0008] 2. Chinese patent CN 107340023 A discloses an Internet of Things gas meter. By installing a sensor module in the base meter and comparing the pressure difference between the inside and outside of the gas meter, it is judged whether the gas meter is leaking; Judgment by self-measurement performance degradation

[0009] 3. Chinese patent CN 107707386 A discloses a gas meter failure prompt method based on the composite Internet of Things and an Internet of Things system, focusing on coordinating users through the Internet of Things system to solve simple failures of gas meters; It only involves monitoring simple power supply failures such as undervoltage of the battery of the gas meter and poor contact of the positive and negative electrodes of the battery, and does not reflect the deep-seated problems such as the degradation of the meter’s own measurement performance and small leakage. fault self-test

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