Types, development and characteristics of flow meters

Abstract: The types, development and characteristics of flow meters are provided by excellent flow meter and flow meter manufacturers. 1. The development of flow meter The development of flow measurement can be traced back to ancient water conservancy projects and urban water supply systems. Orifice plates have been used to measure the amount of drinking water for residents in the time of Caesar in ancient Rome. The weir method was used in ancient Egypt to measure the flow of the Nile around 1000 BC. I. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the types, development and characteristics of flowmeters. 1. The development of flow meter The development of flow measurement can be traced back to ancient water conservancy projects and urban water supply systems. Orifice plates have been used to measure the amount of drinking water for residents in the time of Caesar in ancient Rome. The weir method was used in ancient Egypt to measure the flow of the Nile around 1000 BC. my country's famous Dujiangyan water conservancy project uses the water level of Baopingkou to observe the water volume and so on. In the 17th century, Torricelli laid the theoretical foundation of the differential pressure flowmeter, which was a milestone in flow measurement. Since then, the prototype of many types of meters for flow measurement in the 18th and 19th centuries began to take shape, such as weir, tracer, pitot tube, venturi, volumetric, turbine and target flowmeters. In the 20th century, due to the rapid increase in the demand for flow measurement in the process industry, energy measurement, and urban public utilities, the rapid development of meters has been promoted. The rapid development of microelectronic technology and computer technology has greatly promoted the upgrading of meters, and new flow meters have sprung up like mushrooms after a rain. . So far, it is said that hundreds of flowmeters have been put into the market, and many difficult problems in field use are expected to be solved. my country's development of modern flow measurement technology is relatively late, and the flow instruments required in the early days were imported from abroad. Flow measurement is the science of studying the change of matter, and the law of mass mutual change is the basic law of the development of things. Therefore, the measurement object is not limited to the pipeline liquid in the traditional sense. Wherever it is necessary to master the quantitative change, there is a problem of flow measurement. Flow rate, pressure and temperature are listed as the three major detection parameters. For a certain fluid, as long as these three parameters are known, the energy it has can be calculated, and these three parameters must be detected in the measurement of energy conversion. Energy conversion is the basis of all production processes and scientific experiments, so flow and pressure and temperature instruments are the most widely used. 2. The application field of flowmeter The application of flow measurement technology and instrument generally has the following fields. The type of flowmeter is an instrument used to measure the fluid flow in the pipeline (the volume of fluid passing through a unit of time). There are rotor flowmeters, throttle flowmeters, slit flowmeters, volumetric flowmeters, electromagnetic flowmeters, ultrasonic flowmeters and weirs. There are many types of flow measurement methods and instruments, and many classification methods. So far, there are as many as 60 types of flow meters available for industrial use. The reason why there are so many varieties is that a flow meter that is suitable for any fluid, any range, any flow state and any use conditions has not yet been found. Of these more than 60 kinds of flow meters, each product has its specific applicability and its limitations. According to the measurement object, there are two categories: closed pipeline and open channel; according to the purpose of measurement, it can be divided into total measurement and flow measurement, and the instruments are called total meter and flowmeter respectively. The total meter measures the flow through the pipeline for a period of time, which is expressed by dividing the total amount flowing in a short period of time by the quotient of the time. In fact, the flow meter is usually also equipped with a cumulative flow device, which is used as a total meter. The total meter is also equipped with a flow signalling device. Therefore, it has no practical significance to divide the flow meter and the total meter in a strict sense. According to the measurement principles, there are mechanical principles, thermal principles, acoustic principles, electrical principles, optical principles, and atomic physics principles. According to the most popular and extensive classification method at present, it is divided into: volumetric flowmeter, differential pressure flowmeter, float flowmeter, turbine flowmeter, electromagnetic flowmeter, vortex flowmeter in fluid oscillation flowmeter, mass flowmeter Flowmeters and Insertion Flowmeters, Probe Flowmeters,To explain the principle, characteristics, application overview of various flowmeters and the development situation at home and abroad. 3.1 Differential pressure flowmeter The differential pressure flowmeter is an instrument that calculates the flow rate according to the differential pressure generated by the flow detection piece installed in the pipeline, the known fluid conditions and the geometric dimensions of the detection piece and the pipeline. The differential pressure flowmeter consists of a primary device (detection piece) and a secondary device (differential pressure conversion and flow display instrument). Differential pressure flowmeters are usually classified in the form of test pieces, such as orifice flowmeters, Venturi flowmeters, and uniform velocity tube flowmeters. The secondary devices are various mechanical, electronic and electromechanical integrated differential pressure gauges, differential pressure transmitters and flow display instruments. It has been developed into a large class of instruments with a high degree of three-dimensionalization (serialization, generalization and standardization) and a large variety of specifications. It can measure both flow parameters and other parameters (such as pressure, level, density, etc. ). The detection parts of the differential pressure flowmeter can be divided into: throttling device, hydraulic resistance type, centrifugal type, dynamic pressure head type, dynamic pressure head gain type and jet type according to their principle of action. Test pieces can be divided into two categories according to their degree of standardization: standard and non-standard. The so-called standard test piece is designed, manufactured, installed and used in accordance with the standard document, and its flow value can be determined and the measurement error can be estimated without real flow calibration.

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