An auxiliary channel type ultrasonic flowmeter measuring block

Abstract

The invention discloses an auxiliary sound track type ultrasonic flow meter measuring block. The auxiliary sound track type ultrasonic flow meter measuring block comprises two energy conversion modules reused for sending and receiving ultrasonic signals in a time dividing mode and an auxiliary sound track module used for transmitting reference pulse signals; the sharp corners of the inclined end faces of the two energy conversion modules inwards adhere to the same surface of the left side and the right side of the auxiliary sound track module and the upper surface of the auxiliary sound track module and the lower surface of the auxiliary sound track module respectively adhere to copper foil. The auxiliary sound track type ultrasonic flow meter measuring block solves the problem that due to change of the actual working conditions of temperature, pressure and the like, the performance of an ultrasonic transducer is instable, and thus zero drift of a flow meter is caused. Due to the fact that two independent common ultrasonic transducers are replaced by the integrally-designed ultrasonic flow meter measuring block, the influence of zero drift on an ultrasonic flow meter is eliminated, the accuracy and the stability of long-time work of the flow meter are guaranteed, and the auxiliary sound track type ultrasonic flow meter measuring block can be widely used in the fields of an ultrasonic heat meter, an ultrasonic water meter and the like and is particularly suitable for the measuring occasions with obvious temperature and pressure change and serious zero drift of the flow meter.

Description

technical field [0001] The invention relates to an ultrasonic flowmeter measuring block, in particular to an auxiliary channel type ultrasonic flowmeter measuring block. Background technique [0002] At present, the pipe-segment ultrasonic flowmeter based on the direct transit time method eliminates the signal attenuation caused by the corrosion of the pipe material and the gap between the lining and the pipe. The accuracy is generally high, and it has broad development prospects. Ultrasonic transducer is a key measuring element, and its performance stability and reliability are directly related to the zero point stability of ultrasonic flowmeter. [0003] In recent years, ultrasonic transducers have received more and more attention, and certain progress has been made in both theoretical research and manufacturing processes. However, with the increase of the diameter of the pipe section and the change of temperature and pressure, the zero-point drift problem of the existing...

AI Technical Summary

Problems solved by technology

[0005] However, there are still some deficiencies in the above-mentioned improvement method: pairing the ultrasonic transducer can reduce the influence of zero drift on the measurement accuracy of the flowmeter to a certain extent, but it cannot completely eliminate this influence, and there is no perfect pairing criterion at present; Optimizing the composition of the matching layer material can improve the stability of the ultrasonic transducer, but changes in the composition will cause changes in the acoustic impedance, density and other parameters of the material, which in turn will affect the sensitivity of the transducer. The improvement of stability is also limited; in the field of clamp-on ultrasonic flowmeters, the reference signal needs to propagate through the pipe wall, which is greatly affected by the pipe material and lining, and it is often necessary to design different acoustic wedge structures for different pipe section materials and linings And a specific transducer, at the same time, the smaller the measurement aperture, the greater the error, and the poor applicability

Images