Introduction to the principle of vortex flow meter scale and hot spots

Abstract: introduction to the principle of vortex flow meter scale and hot spots of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: the measuring principle and application of vortex flowmeter are introduced. The choice of vortex flowmeters are presented concretely, parameter setting of vortex street flowmeter, install and use the matters needing attention. Compared with the orifice meter, has simple structure, easy installation, maintenance, measuring van. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the introduction to the principle of vortex flow meter scale and hot article details. The measuring principle and application of vortex flowmeter are introduced. The choice of vortex flowmeters are presented concretely, parameter setting of vortex street flowmeter, install and use the matters needing attention. Compared with the orifice meter, has simple structure, easy installation, maintenance, wide measuring range, etc. Saturated steam flow measurement is widely used in the 80 s standard orifice flow meter, but from the point of flow meter development condition, although the orifice flowmeter has a long history, wide application range; People is zui fully on its research, test data zui is perfect, but using the standard orifice flow meter to measure the saturated steam flow, it still exists some deficiencies: first, the pressure loss is bigger; Second, pressure pipe, and coupling between the three groups easy leakage; Thirdly, small scale range, general is 3 to 1, the flow volatility is easy to cause the measured value is low. And vortex flowmeter has simple structure, vortex transducer installed directly on the pipeline, overcame the pipeline leakage phenomenon. In addition, the pressure loss of vortex flowmeter is lesser, span a wide range, the saturated steam measurement range can be up to 30 to 1. Therefore, with the mature of vortex street flowmeter measurement technology, the use of vortex flowmeter is more and more get the favour of people. The measuring principle of vortex flowmeter, vortex flowmeter is applied to measure the flow of fluid oscillation principle, the fluid in the pipeline through the vortex flow transmitter in triangular prism is proportional to the velocity vortex occurred after the body up and down alternately produced two columns of the vortex, the release of the vortex frequency and average velocity and vortex flow vortex occurred body fluid was related characteristics of body width, available under type said: f = Stv/d type: f for the release of vortex frequency, Hz; V to through the spiral body fluid average speed, m/s. D to vortex characteristics of body width, m; St for si, ha, dimensionless, its numerical range of 0. 14-0. 27. St is a function of Reynolds number, St = f ( l/Re） 。 When the Reynolds number Re, within the range of 102 ~ 105 St value is about 0. 2, therefore, in the measurement, try to meet the needs of fluid Reynolds number in 102 ~ 105, the vortex frequency f = 0. 2v/d。 Therefore, by measuring the frequency of the vortex can be calculated through the spiral body fluid average velocity v, again by type q = vA can calculate the flow q, among them A is the cross-sectional area of the body fluid through the spiral. When vortex in the event of a body on both sides of the produce, using piezoelectric sensor to measure a alternating lift force perpendicular to the flow of change, to transform the change of lift to the frequency of the electrical signals, then frequency signal is amplified and plastic, output to the secondary instrument, accumulate, display. Second, the application of vortex flowmeter, vortex flowmeter selection (1 1) The selection of vortex flow transmitter in saturated vapor measurement using hefei instrument factory production of VA type piezoelectric vortex flow transmitter, due to the vortex flow meter range wide, therefore, in practice, the measurement of saturated steam flow main consideration shall not be less than the lower limit of vortex flowmeters, that is to say, must satisfy the fluid flow rate shall be not less than 5 m/s. According to the size of the YongQiLiang chooses different caliber of vortex flow transmitter, rather than with the existing technology to choose transmitter diameter pipe size. （ 2) Pressure compensation long choice because of the saturated steam pipe of the pressure transmitter, pressure fluctuation is bigger, the pressure compensation must be used, considering the pressure, temperature and density, the relation between measurement using pressure compensation, because my company pipeline saturated vapor pressure at 0. 3-0. 7 mpa range, the range of pressure transmitter option 1 mpa. （ 3) Display instrument selection display instrument intelligent flow display, compensated by temperature, pressure, the instantaneous flow and cumulative flow integrating function. Most of the set (2, vortex street flowmeter 1) Instrument system Settings, hefei instrument factory need to set the instrument coefficient K is available under type said: = 1000 K/K0 type: K0 for vortex occurred in a factory calibration instrument constant, L/pulse; K units for the pulse number/m3. （ 2) Set pressure compensation range of pressure transmitter. （ 3) Pressure and flow alarm limit setting. 3, the installation of vortex street flowmeter ( 1) Vortex flow meter installed in as far as possible away from the vibration source and the strong electromagnetic interference, the vibration of local vibration damping device must be used, reducing pipe affected by vibration. （ 2) Straight pipe before and after the straight section of the configuration, to meet the requirements of vortex flowmeters, the pipe diameter must also and vortex flow transmitter inside diameter. 4, vortex street flowmeter using precautions to minimize the pipe steam hammer impact on vortex in body. When vibration is larger and cannot eliminate, unfavorable use vortex flowmeter. Vortex flowmeter are three, the conclusion after put into use in our company, to overcome some shortcomings, the original orifice flowmeter measurement of saturated steam is more accurate, more stable, and easy maintenance, but it is worth noting that the measurement of saturated steam fluid flow rate shall be not less than 5 m/S, otherwise, the meter will value is low. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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