Insertion Vortex Flow Meter Product Accuracy

Abstract: The product accuracy information of the plug-in vortex flowmeter is provided by the excellent manufacturers of flowmeters and flowmeters. With the increasing modernization of industry, the socialization of municipal construction and other factors, the diameter of pipes used in industry, municipal administration, energy, etc. has gradually increased. The use of throttling devices (such as orifice plates, venturi tubes) not only has excessive pressure loss, but also the structure is too large and cumbersome; More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the details of the product accuracy of the plug-in vortex flowmeter. With the increasing modernization of industry, the socialization of municipal construction and other factors, the diameter of pipes used in industry, municipal administration, energy, etc. has gradually increased. The use of throttling devices (such as orifice plates and Venturi tubes) not only has excessive pressure loss, but also has a bulky and cumbersome structure; while the recently emerging ultrasonic flowmeters are too expensive. In the past 20 to 30 years, the insertion flowmeter has been widely concerned and selected due to its advantages of simple structure, light weight, easy installation and maintenance, small pressure loss and low price. Its characteristic is to calculate the flow rate based on only measuring the flow velocity of one point (or several points) in the pipeline. Although it is simple, it implies the disadvantage that the accuracy is difficult to improve. Under the conditions of the current market economy, logistics generally requires economic accounting. For this reason, it is necessary to inquire whether the accuracy can reach the claims claimed by many manufacturers under actual application conditions.±1%. 1. Types and characteristics of plug-in flow meters 1. Types of flow meters are generally divided according to principles, such as throttling, vortex, electromagnetic, ultrasonic, etc. Most of these meters are installed on the pipeline through flanges. The plug-in flowmeter, as the name suggests, is a flow meter installed in a plug-in form, which calculates the flow by measuring the flow rate at one point (or several points) in the pipeline. It can be said that any instrument that can measure the flow rate can be an instrument that can measure the flow rate, and can become an insertion flowmeter (this article only discusses the insertion flowmeter that measures a little flow rate). These flowmeters are currently commonly used: ( 1) Pitot tube is a classic and relatively accurate flow meter. It was often used for on-site measurement decades ago. Due to its easy blockage and small output differential pressure, it is rarely used in industrial sites, but it is still often used for calibration. (2) Pitot—Venturi tube, also known as double horn tube or double venturi tube, is also based on the principle of Pitot tube velocity measurement, but it adopts acceleration and decompression measures in structure. , and not easy to block, can withstand high temperature, but the accuracy is not high. (3) Other flow meters such as vortex street, turbine, and electromagnetic can reflect the size of the flow rate. It can be made into a small measuring head, and the flow rate can be calculated by measuring the flow rate of a certain point in the pipeline. 2. Advantages and disadvantages (1) The structure is simple, light and low in manufacturing cost. (2) The pressure loss is small, the operating cost is low, and it is an energy-saving instrument. (3) One structure can be used for various calibers (limited to point-speed type), which can reduce the number of users' spares. (4) Easy to package, transport, install and maintain. (5) It can be installed and disassembled without interruption, avoiding the economic loss caused by interruption. (6) The flow velocity distribution in the pipeline has a great influence on the measurement accuracy, and the straight pipe section is required to be as long as 30D~50D. (7) The on-site situation is complex, which has a great influence on its application and is difficult to standardize. (8) It is difficult to improve the accuracy, generally it can only reach±(3~5%). Two flow velocity distribution in industrial pipes 1. Fully develop turbulent flow By definition, the flow rate qv in the pipe is equal to the pipe cross-sectional area A multiplied by the axial flow velocity V passing through this cross-section, that is, qv=AV. However, due to the influence of various resistance parts (elbow, reducer, manifold, valve, etc.) upstream of the pipeline, the flow velocity distribution is very complex, not only not constant, but also radial velocity, vortex and secondary flow (Figure 2 ) fortunately, under the action of the viscosity of the actual fluid, through 30—After a straight pipe section with a length of 50 times the pipe diameter, the flow velocity distribution will tend to a relatively fixed form. This flow is called fully developed? ? flow. For decades, the engineering community has agreed to use this flow as the standard flow for flow measurement. As early as 1932, Nikuradse systematically tested this flow in a smooth tube and described it with (1): V = Vm (y /R)1/n(1) In the formula, V——Flow velocity at the measuring point; Vm——Maximum flow velocity at the center of the pipe; y——The distance from the measuring point to the pipe wall; R——Pipe radius; n——The exponent, depending on the Reynolds number Re, is shown in Table 1.
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