Vortex mass flow meter

Abstract

The invention discloses a vortex mass flow meter, comprising a measuring tube, a vortex generating body arranged in the measuring tube and a flow detection element. The measuring tube is composed of an inlet section, a contraction section, a throat part, an extension section and an outlet section which are connected in sequence, the inlet section and the outlet section are straight round tubes with the same diameters, the contraction section and the extension section are conical tubes with the same conical degrees, and the throat part is a straight round tube the inner diameter of which is smaller than that of the inlet section; and the vortex generating body and the flow detection element are both arranged on the throat part of the measuring tube. In the invention, the contraction section is used for adjusting flow field and improving flow speed, the extension section is used for restoring the tube diameter contracted by the contraction section, and the contraction section and the extension section can improve the pressure loss of the measuring loss. By installing the vortex generating body and the flow detection element on the throat part of the measuring tube, due to the acceleration action when flow passes through the contraction section, the lower limit flow value of a meter can be greatly reduced and the measuring range of the meter can be improved by measuring the flow at the throat part.

Description

technical field [0001] The invention relates to the technical field of vortex street mass flowmeters, and more specifically relates to a wide range vortex street mass flowmeter. Background technique [0002] Vortex flowmeters are mainly used for flow measurement of industrial pipeline media fluids, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range and high precision. There are no moving mechanical parts, resulting in high reliability and low maintenance. Instrument parameters can be stable for a long time. It has analog standard signal and digital pulse signal output. It is easy to be used with computer and other digital systems. It is a relatively advanced and ideal flowmeter. The vortex flowmeter arranges a triangular vortex generator in the fluid, and alternately generates two regular rows of vortices whose frequency is proportional to the flow velocity from both sides of the vortex generator, and obtains the ...

AI Technical Summary

Problems solved by technology

[0003] The current vortex flowmeters use straight circular tubes as the measuring tubes of the flowmeter when measuring mass flow, and take differential pressure signals before and after the vortex generator. Since the differential pressure signal is only generated by the vortex generator, the differential pressure value is relatively low. , the differential pressure value is lower when measuring a small flow rate, so the lower limit flow rate of the flowmeter cannot be too small, and the range range of the flowmeter is not wide enough

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