Vortex flow meter scale how to choice

Abstract: how scale vortex flowmeter selection information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Along with the development of the flow measurement technology, vortex flowmeter is applied more and more, but because of this kind of flow meter use time is shorter, often will encounter many problems in practical use, the article briefly describes the working principle of vortex flowmeters, and presents. More flow meter manufacturers choose model price quote you are welcome to inquire, here is how scale vortex flowmeter selection article details. Along with the development of the flow measurement technology, vortex flowmeter is applied more and more, but because of this kind of flow meter use time is shorter, often will encounter many problems in practical use, the article briefly describes the working principle of vortex flowmeters, and gives the specific selection use advice. Vortex flowmeter is a new advanced contemporary flow meter, it is the end of the 70 s and early 80 s, developed a kind of natural oscillation type flowmeter since came out with a new principle and structure show the incomparable superiority to other instruments, it has simple structure, easy installation and maintenance, applicable fluid variety, high accuracy, wide flow range and the advantages of small pressure loss, in a very short period of time had the large amount of applications. But because the application time is short, less theoretical research and practical experience in applications, according to our factory for many years the use of practice has proved that the reasonable selection of use is the key to good application of this kind of flow meter. 1 meter of the working principle of a nonlinear object placed in the flow field will be behind the object alternately in crisscross vortex separation release rules of two columns, this vortex is called & other; Karman vortex street & throughout; 。 The streamlined objects called spiral body, within the scope of a certain flow, vortex separation frequency is proportional to the average flow velocity in the piping ( Traffic) Separation, through various forms to detect vortex frequency to measure the flow of fluid, set to measured medium flow average flow velocity. And the width of the incident flow surface of the vortex occurred for d, have the following relation: type of vortex street frequency f; D to spiral body width; As to flow velocity; S for the strouhal number; D for the table body size. S for dimension number, nothing for a spiral body, strouhal number s. And Reynolds number r. When the Reynolds number r. In the 2 x104 a 7 xro & other; Within the scope of strouhal number s, can be thought of as constant. By type ( 1) That incident flow in spiral body surface width d and strouhal number 5. For the known conditions, can be identified by measuring sensor separation frequency and average flow velocity in pipeline fluid. And the volume flow. 2 the selection of vortex flowmeters in the selection of vortex flow time, the first thing to notice the measured medium temperature and pressure, the chosen instrument must be able to adapt to the actual status of the temperature and the pressure. Second to choose appropriate diameter, if mouth diameter selection is too big, not only increase the cost, but also can't play the ability of flowmeter, measurement data is not allowed; If you select the diameter is too small, pressure drop is too large, or cavitation occurred, this will affect the meter accuracy. Another speeding can also affect the life, cause mechanical damage. Before the selection of vortex flowmeter, deal with accounting medium flow pipeline, to determine the actual work flow is beyond the scope of the selected flow meter to measure. In general, tube zui big work flow ( Velocity) Is not beyond the vortex street flowmeter measurement limit ( The air resistance of 50 s, water vapor resistance of 70 s, 7 m/s) 。 Therefore, only zui small flow of pipeline medium business accounting. If vortex flow meter is used for gas measurement, due to the vortex street flowmeter measurement is the use of state of traffic volume, and flow value is often provided by general standard state flow value, therefore, first of all should be standard state conversion to work ( Liquid for non-compressible fluid, generally do not consider this state) 。 Conversion formula is as follows: q type. As the work flow, m3 / h. q。 As the standard state flow, expanding/h; P, as the working pressure, pa; Now for the working condition temperature, ℃; t。 As the standard state, temperature ℃ ( Note, t.

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