The working principle and characteristics of the vortex flowmeter

Abstract: The working principle and characteristic information of the vortex flowmeter are provided by the excellent flowmeter and flowmeter manufacturers. Vortex flowmeter is a new type of flow measuring instrument made according to the principle of 'Kamen vortex'. When a stable fluid flows through a straight pipe with a certain length, it hits a nonlinear cylinder immersed in the fluid, and a vortex (aka Karman vortex) will be generated downstream of the fluid. Call for consultation, the following is the details of the working principle and characteristics of the vortex flowmeter. The vortex flowmeter is a new type of flow measuring instrument made according to the principle of 'Kamen vortex'. When a stable fluid flows through a straight pipe with a certain length , hits the nonlinear cylinder immersed in the fluid, and a vortex (i.e. Karman vortex) will be generated downstream of the fluid. When the Reynolds number (Re) of the fluid is within a certain range, the law of occurrence of the vortex is stable and reliable, and the vortex occurs. The frequency F of is determined by the formula: F=(St * V)/d where V is the flow velocity; d is the width of the upstream surface of the cylinder; St is the Stroha number. The Stroha number is a dimensionless Parameters, the figure below shows the relationship between the Stroha number and the Reynolds number. Within a certain range of Reynolds number, the Stroha number remains basically unchanged, so it can be considered that the Reynolds number is within this range of the release frequency of the Karman vortex It is proportional to the speed of the fluid. Therefore, the flow velocity V can be obtained from the detected frequency F, and the volume flow can be obtained from V. The characteristics and uses of the vortex flowmeter a: Features: ①Anti-vibration Excellent performance, no zero drift and high reliability. Through a large number of waveform analysis and spectrum analysis of the vortex flowmeter for a long time, plus the best probe shape, wall thickness, height, probe rod diameter and matching The piezoelectric crystal is processed by advanced CNC lathes to ensure the technical parameters such as the coaxiality and smoothness of the processing, and cooperate with special process processing, so as to overcome the influence of the inherent self-oscillation frequency of the vortex flowmeter on the signal to the greatest extent. This is a common problem. ②The sensor of the intelligent vortex flowmeter is very versatile, so that the sensor has good interchangeability. The surface body and vortex generator of the sensor are processed by advanced numerical control equipment to ensure the processing accuracy, so that the parts ( Especially the vortex generator) has strong versatility, so that the repeatability and accuracy of the sensor will not be affected by the replacement of parts; it can generate a strong and stable vortex signal. ③Simple and firm structure, no moving parts , high reliability, easy to use and maintain. ④ The detection element is not in contact with the medium, with stable performance and long service life. Therefore, the vortex flowmeter has the characteristics of simple structure, good versatility and high stability. ⑤ Output pulse signal or analog signal proportional to the flow rate, no zero drift, high precision, easy to network with computer ⑥ Measuring range Wide, turndown ratio up to 1:10 ⑦Vortex flowmeter does not need compensation when measuring volume flow, the signal output by the vortex is actually linearly related to the flow rate, that is, proportional to the volume flow. Pressure and temperature compensation The purpose is to obtain the density of the fluid, multiply the volume flow to get the mass flow, and if the volume flow of the gas is measured, no compensation is needed. ⑧ The pressure loss is small. Use the caliber DN5 0 vortex flowmeter measures the flow of combustible gas, if the maximum flow in the pipeline Qmax = 200m3/h, the pressure loss of the sensor is: △P = 1.08 × 10-6 ρv2 (kPa) = 0.605 KPa ⑨ At a certain Within the Reynolds number range, the flow characteristics are not affected by fluid pressure, temperature, viscosity, density, and composition, but are only related to the shape and size of the vortex generator. ⑩ Wide range of applications, steam, gas, liquid flow can be measured. b: Uses: This flowmeter can be widely used in large, medium and small pipeline water supply and drainage, industrial circulation, sewage treatment, oil and chemical reagents, as well as the flow measurement of compressed air, saturated and superheated steam, natural gas and various media . The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'The working principle and characteristics of the vortex flowmeter'

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