Research on V-cone Flow Meter

Abstract: The research information of V-cone flowmeter is provided to you by excellent flowmeter and flowmeter production and quotation manufacturers. In recent years, with the continuous progress of electronic technology and computer technology, flow measuring instruments have also begun to develop in the direction of integration and intelligence. Among them, the intelligent flowmeter is a very widely used intelligent flow measurement instrument. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the research articles on V-cone flowmeters. In recent years, with the continuous progress of electronic technology and computer technology, flow measuring instruments have also begun to develop in the direction of integration and intelligence. Among them, smart flowmeter is a very widely used intelligent flow measurement instrument. It measures flow signals from different types of flow transmitters, supplemented by temperature and pressure obtained by temperature transmitters and pressure transmitters. The compensation signal performs real-time flow compensation for different fluids according to different algorithms, thereby realizing the measurement, accumulation, display and output of fluid volume flow or mass flow. In addition to these basic functions, the current flow totalizer also has additional functions such as recording, communication, printing, etc., and has certain fault diagnosis and self-recovery capabilities. The intelligent V-cone flowmeter is in“V”It was developed on the basis of the type inner cone throttling device. It can detect temperature, differential pressure and absolute pressure signals at the same time, and can perform real-time temperature and pressure compensation for flow. In the flow algorithm, floating-point numbers are used for operations, and at the same time, the fast rooting algorithm based on Newton's iteration method is used to perform the square rooting of floating-point numbers. 1 Working principle of V-cone flowmeter and temperature and pressure compensation“V”Type throttling device, temperature sensor, pressure sensor, etc. The conversion part includes acquisition circuit, SD16_A, liquid crystal display circuit, etc. 1.1.1 Flow measurement V-cone flowmeter uses a V-shaped pointed cone coaxially installed in the pipeline to gradually throttle and shrink the fluid to the inner wall of the pipeline, and measure the differential pressure before and after the V-shaped inner cone. measure flow. The V-cone throttling device consists of a pointed cone mounted coaxially in the measuring tube and a corresponding pressure-taking port. The measuring tube is pre-machined and produces differential pressure at both ends of the pointed cone. The high pressure (positive pressure) of this differential pressure is the static pressure p1 measured at the pressure-taking port of the pipe wall before the upstream fluid shrinks, while the low pressure (negative pressure) is at the end face of the cone toward the downstream and at the center axis of the cone. Take the pressure p2 at the pressure hole, as shown in the figure. The tip of the cone faces the incoming flow, and there is a sharp, acute angle between the cone and its trailing face. The edge of this interface allows the fluid to have a smooth transition zone before entering the downstream low pressure zone and finally allowing the fluid to flow through the annular gap between the cone and the pipe. Fig. 1 Working principle diagram of V-cone flowmeter The calculation of flow rate is derived from Bernoulli's equation. The conclusion is that the flow in the flow tube is the same as“V”The square root of the differential pressure before and after the throttling element is proportional to the square root, and the calculation formula of the volume flow is as follows: (1) In the formula: qm is the volume flow value, kg/s; c is the outflow coefficient; ε is the expansion coefficient;βis the equivalent diameter ratio; d is the equivalent opening diameter;ρis the density of the fluid, g/m3; Δp is the differential pressure value, ΔP=P1-P2Pa. 1.1.2 Outflow Coefficient C According to ISO4006, the outflow coefficient of throttling flowmeter is defined as the ratio of incompressible fluid flow, actual flow and theoretical flow (for compressible fluid, the ratio is equal to the outflow coefficient multiplied by the expansion coefficient ); for V-cone flowmeter, because there is no standard document to follow, it must be measured with an incompressible fluid. The following is the calibration device designed to calibrate the outflow coefficient in the experiment, as shown in Figure 2. Figure 2 The measuring cylinder of the outflow coefficient calibration device measures the actual volume flow, and the V-cone flowmeter measures the theoretical flow value. For each V-cone flowmeter, the outflow coefficient C used in the flow equation is obtained by flow calibration. The typical value range of C is 0.75～0.85. 1.1.3 Gas expansion coefficient of V-cone flowmeter If the measured medium is gas or steam, the Bernoulli equation must be corrected with the gas expansion coefficient ε. This is due to the gas density across the throttle due to pressure changesρThe changes do not apply to liquids. The expansion coefficient ε is 1 for liquids, and ε<1 for gases and vapors. According to the expansion coefficient of gas defined in ISO4006: (2) (3) where C is the outflow coefficient calibrated above. Although there is no standard document available, due to the limited existing conditions, the expansion coefficient cannot be calibrated with a device like the outflow coefficient. So here I use the conclusions given by three doctors from NEL laboratory and McCrometer Company in a paper of an international traffic conference in 2001. The basic idea is: according to ISO5167, the C·ε and Δp/(k·p1) is regarded as a linear relationship, and the gas is used as the medium test, the product of C and ε is obtained, and then the expansion coefficient can be obtained by removing the outflow coefficient. In this subject, their fitting formula is not directly quoted, but the formula fitted by Professor Xu Ying of Tianjin University is adopted. The fitting formula is as follows:

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