Introduction to the classification and principle of common flow meters

Abstract: The information on the classification and principle of common flowmeters is provided by excellent flowmeter and flowmeter manufacturers. Introduction to the classification and principle of common flow meters Instruments that measure fluid flow are collectively referred to as flow meters or flow meters. Flowmeter is one of the most important instruments in industrial measurement. With the development of industrial production, the requirements for the accuracy and range of flow measurement are getting higher and higher. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the classification and principle introduction articles of common flowmeters. Introduction to the classification and principle of common flow meters Instruments that measure fluid flow are collectively referred to as flow meters or flow meters. Flowmeter is one of the most important instruments in industrial measurement. With the development of industrial production, the requirements for the accuracy and range of flow measurement are getting higher and higher, and the flow measurement technology is changing with each passing day. In order to adapt to various uses, various types of flowmeters have come out one after another. At present, there are more than 100 kinds of flowmeters that have been put into use. Each product has its specific applicability, as well as its limitations. According to the measurement principles, there are mechanical principles, thermal principles, acoustic principles, electrical principles, optical principles, and atomic physics principles. Classified according to the structure principle of flowmeter: there are positive displacement flowmeter, differential pressure flowmeter, float flowmeter, turbine flowmeter, electromagnetic flowmeter, vortex flowmeter, mass flowmeter and insertion type in fluid oscillating flowmeter. flowmeter. 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. 1. Classification by measurement principle 1. Mechanical principle: Instruments belonging to this type of principle include differential pressure type and rotor type using Bernoulli's theorem; impulse type and movable tube type using the momentum theorem; direct use of Newton's second law Mass type; target type using the principle of fluid momentum; turbine type using angular momentum theorem; vortex type and vortex street type using the principle of fluid oscillation; pitot tube type using total static pressure difference, volume type and weir, trough type, etc . 2. Electrical principle: The instruments used for this principle include electromagnetic, differential capacitive, inductive, strain resistance and so on. 3. Acoustic principle: There are ultrasonic methods for flow measurement using the acoustic principle. Acoustic type (shock wave type), etc. 4. Thermal principle: There are thermal type, direct thermal type, indirect thermal type, etc. that use thermal principle to measure flow. 5. Optical principle: Laser type, photoelectric type, etc. are instruments that belong to this type of principle. 6. Principles of atomic physics: nuclear magnetic resonance, nuclear radiation, etc. are instruments that belong to such principles. 7. Other principles: there are marking principles (tracer principle, nuclear magnetic resonance principle), related principles, etc. 2. Classification according to the structure principle of the flowmeter According to the actual situation of the current flowmeter products, according to the structure principle of the flowmeter,It can be roughly divided into the following types: 1. Differential pressure flowmeter Differential pressure flowmeter is based on 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. Meter for calculating flow. 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. Non-standard test pieces are less mature and have not been included in international standards. Differential pressure flowmeter is one of the most widely used flowmeters, and its usage occupies the first place in all kinds of flowmeters. In recent years, due to the advent of various new flowmeters, the percentage of its usage 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. ).

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