Talking about the development and current situation of flow meter

Abstract: Talking about the development and status of flow meter information is provided by the excellent flow meter and flow meter production and quotation manufacturers. 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 for so many varieties is that no one has yet been found for any fluid, any range, any flow. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is a brief introduction to the development and status of flowmeters. 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. Each of these 60 kinds of flow meters has its specific applicability and its limitations. According to the measurement object, there are two categories of closed pipes and open channels; according to the purpose of measurement, it can be divided into total measurement and flow measurement, and the instruments are called total meters and flow meters 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 is no longer practical 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, this article is divided into: positive displacement flowmeter, differential pressure flowmeter, float flowmeter, turbine flowmeter, electromagnetic flowmeter, vortex flowmeter in fluid oscillating flowmeter, Mass flowmeters and insertion flowmeters are used to describe the principles, characteristics, application overview and development situation of various flowmeters at home and abroad. [1] Differential pressure flowmeter 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 even 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 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 not only flow parameters, but also other parameters (such as pressure, level, density, etc. ). The detection parts of 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. Non-standard test pieces are less mature and have not been included in international standards. Differential pressure flowmeter is the most widely used flowmeter, and its usage occupies the first place in all kinds of flowmeters. In recent years, due to the advent of various new flowmeters, its usage percentage has gradually declined, but it is still the most important type of flowmeter. Advantages: (1) The most widely used orifice plate flowmeter has a firm structure, stable and reliable performance, and long service life; (2) It has a wide range of applications, and so far there is no other type of flowmeter that can be compared with it; Transmitters and display instruments are produced by different manufacturers, which is convenient for economies of scale. Disadvantages: (1) The measurement accuracy is generally low; (2) The range is narrow, generally only 3:1~4:1; (3) The requirements for on-site installation conditions are high; (4) The pressure loss is large (referring to the orifice plate, nozzle, etc. ). Application overview: Differential pressure flowmeter has a wide range of applications, and is used in various objects in the flow measurement of closed pipelines, such as fluid: single-phase, mixed-phase, clean, dirty, viscous flow, etc.; working state: constant Pressure, high pressure, vacuum, normal temperature, high temperature, low temperature, etc.; pipe diameter: from several mm to several m; flow conditions: subsonic, sonic, pulsating flow, etc. Its usage in various industrial sectors accounts for about 1/4~1/3 of the total usage of flowmeters. [2] Float flowmeter A rotameter, also known as a rotameter, is a type of variable area flowmeter. In a vertical conical tube that expands from the bottom to the top, the gravity of the float with a circular cross-section is driven by the hydrodynamic force. withstand, so that the float can rise and fall freely in the cone.

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