Introduction to vortex flow meter scale advantages and limitations

Abstract: introduction to vortex flow meter scale advantages and limitations of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Working principle of vortex flowmeter is set in the fluid body vortex, which happen body side alternately with the rules of the vortex, downstream asymmetric vortex column in spiral body is arranged, produce certain frequency, through the formula f = v/St * ( 1 - 1. 27 D / D) 。 More flow meter manufacturers choose model price quote you are welcome to inquire, here is a introduction to vortex flow meter scale advantages and limitations in the article for details. Working principle of vortex flowmeter is set in the fluid body vortex, which happen body side alternately with the rules of the vortex, downstream asymmetric vortex column in spiral body is arranged, produce certain frequency, through the formula f = v/St * ( 1 - 1. 27 D / D) * d, ( St to strouhal number, as the dimensionless number, associated with spiral body and Reynolds number; V as the velocity of flow; D to happen right against the face width; D for the nominal diameter) Can be concluded that the velocity. Generally speaking, vortex street flowmeter output signal, Frequency) Is not affected by changes of fluid physical properties, and component, is refers to the instrument coefficient only involved in the body shape and size as well as the Reynolds number vortex. Its advantages are: simple structure and firm, easy installation and maintenance; Suitable for many kinds of fluid, liquid, gas, steam, and partially miscible phase all apply; Accuracy is higher, general & plusmn; About 1% R; Wide flow range and can reach 10:1 or those days or more; Small head loss; No zero drift; The price is relatively cheap; Defect is: not suitable for low Reynolds number Re < 20000, with high viscosity, low flow velocity, and the use of small diameter limit; On the environment of the demand is higher, should try to put an end to the places where the vibration, and the straight pipe upstream side need to have a longer; Less meter coefficient is low, the greater the diameter. To reduce the signal resolution, it shoulds not be too great caliber, commonly used in DN15 ~ DN300mm. 1. Advantages of VSF has simple structure and firm, easy installation and maintenance, Compared with the throttle differential pressure flowmeter, without guide tube and three valve group, etc. , to reduce leakage and blockage and freezing, etc. ) 。 Apply fluid types, such as liquid, gas, steam and partially miscible fluids. High precision taught ( And the differential pressure type, float-type flowmeter) , is commonly measured value ( ± ~ ± 1%; 2%) Small loss of pressure, About 1/4 to 1/2) orifice flowmeter 。 Output is proportional to the flow of the pulse signal, apply to the total measurement, no zero drift; Within a certain Reynolds number, the output frequency signal from the fluid property, Density and viscosity) And the impact of component, namely the meter coefficient only involved in the body shape size of the pipe and spiral, only need to check in a typical medium and are suitable for all kinds of medium. 2, limitations VSF does not apply to low Reynolds number measurements ( 红色≥ 2× 104). , therefore, under the condition of high viscosity, low velocity, small application is restricted. Vortex separation velocity distribution stability of distortion and the influence of the rotational flow, should according to different forms of choke upstream side a straight pipe configuration long enough (or furnish flow regulator Rectifier) , in general, can draw lessons from the throttle differential pressure flowmeter straight pipe length required to install. Compared with the turbine meter instrument coefficient is low, low resolution, less the greater the diameter, tube flowmeter for 12 full commonly the following. Instrument in the pulsating flow, mixed phase flow is still lack of theoretical research and practical experience. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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