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Vanke's principle of the compressed air flow meter scale

Abstract: the principle of vanke compressed air flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. LUGB series intelligent vortex flowmeter, it is mainly used for industrial piping medium fluid flow measurement, such as gas, liquid and vapor, and other media. Characterized by a small pressure loss, wide range, high precision, working condition of the measurement is almost not affected by the fluid density, volume flow. More flow meter manufacturers choose model price quote you are welcome to inquire, below is the vanke compressed air flow meter scale principle, the article details. LUGB series intelligent vortex flowmeter, it is mainly used for industrial piping medium fluid flow measurement, such as gas, liquid and vapor, and other media. Is characterized by small pressure loss, wide range, high precision, working condition of the measurement volume flow is almost not affected by the fluid density, the influence of the parameters such as pressure, temperature, viscosity. No moving mechanical parts, so high reliability, small amount of maintenance. Instrument parameters can be long-term stability. This instrument USES piezoelectric stress sensor, high reliability, can be in - Working temperature of 20 ℃ ~ + 250 ℃ within the scope of work. There are standard signal simulation and digital pulse signal output, easy with the computer and digital systems, is a more advanced, the ideal flow meter. Does principle set up in the fluid type triangular prism spiral body, from body side alternately vortex taking place with the rules of the vortex, the vortex is called the karman vortex, as shown in the picture on the right, downstream asymmetric vortex column in spiral body is arranged. Sets the frequency of vortex to f, average flow velocity was measured medium, incident flow of the vortex occurred body width is d, table body sizes for d, can get the following formula: f = SrU1 / d = SrU/md ( 1) U1 - type - Vortex occurred on both sides of the average flow velocity, m/s; Sr- - - - - - - Strouhal number; m - - - - - - - Spiral body on both sides of the bow area and volume ratio of the pipe cross section area of the pipe flow qv for qv = & PI; D2U/4=π 老D2mdf / 4 ( 2) K = f / qv = [ π 老D2md / 4) - 1 ( 3) K - type - The instrument coefficient of flow meter, pulse number/m3 ( P / m3) 。 K in addition to the associated with the geometry size of spiral body, pipeline, also related to strouhal number. Strouhal number for the dimensionless parameter, it is associated with spiral body shape and Reynolds number, as shown in figure 2 to cylindrical spiral body the strouhal number of diagram with pipe Reynolds number. The figure shows, ReD = 2 & times; 104 ~ 7报; 106 range, Sr can be regarded as constant, this is the normal work of the instrument. When measuring gas flow rate, VSF flowmeter formula for ( 4) Figure 2 strouhal number and Reynolds number qVn relation curve type, qV - - Respectively for the standard conditions, 0 oc or 20 oc, 101. 325 kpa) And working conditions of traffic volume, m3 / h. Pn, P - - Respectively for the standard conditions and conditions of absolute pressure, Pa. Tn, T - - Respectively under standard state and thermodynamic temperature, in the cases of K; Zn,Z- - Respectively and the compressibility of gas under the condition of standard condition. By visible on type, VSF output pulse frequency of the signal is not affected by fluid physical properties, and composition change, namely the instrument coefficient in only within a certain range of Reynolds number and swirl through the body and the shape size and so on. But as flow meter need to be detected in the material balance and energy metering mass flow rate, the flow meter should be monitored at the same time the output signal of the volume flow rate and fluid density, fluid property and has a direct influence on flow metering or components. Vortex flowmeter is based on the principle of karman vortex closed pipe fluid flow measurement of new type flowmeter. Medium because of its good adaptability, no compensation can be directly measured temperature and pressure steam, air, gas, water, and the operation condition of the liquid volume flow, temperature, pressure sensor to measure standard conditions and volume flow to mass flow, is the ideal substitute of orifice flowmeter. In order to improve high temperature resistance and vibration resistance performance of the vortex flowmeter, our company newly developed HLUG improved vortex flow sensor, because of its unique structure and material to make the sensor in high temperature ( 350℃) And strong vibration ( ≤ 1 g) Under the condition of use. In practical application, often zui big traffic far below the threshold value, as the change of load, zui small flow and tend to be lower than the lower limit value, the instrument is not work in its zui preferred working segments, in order to solve this problem, usually used in the measurement of reducing, improve the measurement of flow velocity and choose a relatively small diameter instrument for measuring instrument, but this way of variable diameter must be variable diameter pipe between the instrument and straight pipe length is more than 15 d were rectifier, processing, installation is inconvenient. Developed by our company profile shape of circular arc LGZ variable diameter rectifier, a rectifier, improve the velocity and change the velocity distribution of multiple function, its structure size is small, just as the process pipe inner 1/3, and the vortex street flowmeter into an organic whole, not only does not need to be added a straight pipe, and can also reduce the requirement for process straight section of pipe installation is very convenient. In order to use convenient, battery-powered local display type vortex flowmeter using micro power consumption of new and high technology, using lithium batteries don't run around more than a year, saving the purchase cost of installation, cable and display instrument to local display instantaneous flow and cumulative flow, etc. Temperature compensation of a bodily form vortex flowmeter with temperature sensor, can directly measure the temperature of saturated steam and calculate the stress, which shows that the mass flow of saturated steam.

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