Ultrasonic gas meter for civil use of integrated transducer and flow detecting method

Abstract

The invention discloses an ultrasonic gas meter for civil use of an integrated transducer and a flow detecting method. The gas meter is composed of a data processing and control communication unit, atime measuring unit, an ultrasonic transmitting/receiving switching unit, an ultrasonic excitation unit, an ultrasonic receiving unit and a transducer integrated structure unit. An n-shaped measuringpipe integrates the transducer integrated structure to overcome the deficiencies that the ultrasonic propagation path is short, and the installment angle theta is not equal to 900; according to the actually-measured temperature, the ultrasonic propagation speed is corrected, the time receiving window is compressed, and the interference resistance capacity and accuracy of an ultrasonic flowmeter are improved; the acoustic impedance of an acoustic matching layer is between that of piezoelectric ceramics and that of a gas medium, the thickness of the matching layer is 1/4 of the wave length of the ultrasonic wave, the ultrasonic refraction propagation attenuation on different medium interfaces is reduced, and the accuracy of the ultrasonic flowmeter is improved. The time difference data utilizes a data cleaning technology to help to eliminate the influences of the complicated and changeable gas flow field on the accuracy.

Description

technical field [0001] The invention belongs to the technical category of gas flow detection; in particular, it refers to a civil ultrasonic gas meter with an integrated structure of an n-shaped measuring tube and a transducer and a flow detection method. Background technique [0002] In 2020, the conservative estimate of China's energy demand is 5 billion tons of standard coal. To meet the above needs, whether it is increasing domestic energy supply or utilizing foreign resources, the energy supply side will face enormous pressure. The pollution produced by my country's coal-based energy structure far exceeds the environmental capacity, and the environmental commitment will face severe challenges; therefore, it is urgent to adjust the unreasonable energy structure dominated by coal. Replacing coal with gas is a powerful measure to control environmental pollution under the existing technical conditions. [0003] As a clean energy source, natural gas has received much atten...

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Problems solved by technology

[0019] The above-mentioned beneficial exploration proposes an automatic gain fuzzy control circuit to adjust the peak value of the ultrasonic signal in real time, but the mixed signal processing circuit is realized by analog devices, which has poor reliability, high complexity, and limited functions; a long-distance through-beam measurement path air chamber is proposed , but the structure of the gas chamber is complex, which affects the distribution of the gas flow field and the corresponding countermeasures are lacking. The cavity of the straight pipe section below is easy to retain debris and affects the measurement accuracy

Therefore, the exploration has a certain reference value, but the results are still limited; further innovative designs need to be made on the basis of the existing results

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