The basic principle and common types of metal tube float flow meter

Abstract: The basic principles and common types of metal tube float flow meters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Metal tube rotameter is mainly used for small and medium-caliber flow measurement, which can measure liquid, gas, steam, etc., and is widely used. 1. The working principle of the metal tube float flowmeter: Measure the flow according to the height of the metal tube float in the conical tube, and use the flow. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the basic principles of metal tube float flowmeters and the details of common types of articles. Metal tube rotameter is mainly used for small and medium-caliber flow measurement, which can measure liquid, gas, steam, etc., and is widely used. 1. Working principle of metal tube float flowmeter: The flow rate is measured according to the height of the metal tube float in the conical tube, and the weight of the float is balanced by the pressure difference generated when the fluid passes through the gap between the float and the tube wall. The higher the float is supported, the larger the annular gap area, that is, the annular gap area changes with the flow rate, so it is generally called the area method. It is mostly used in the measurement of medium and small flow, and there are types with electric remote transmission or gas remote transmission transmitter. 2. Classification of metal tube rotameter: (1) Classification by tapered tube material: It can be divided into transparent material tapered tube and metal tapered tube. ①Transparent conical tube metal tube float flowmeter: The transparent conical tube material includes glass tube, transparent engineering plastics such as polystyrene, polycarbonate, plexiglass, etc. Among them, the glass tube is the most used, but it is easy to break; while the engineering plastic tube is not easy to break, and some are also resistant to corrosion by corrosive media such as acid and alkali. The diameter of the transparent conical tube rotameter is 15~40mm, and the flow indexing is directly engraved on the outer wall of the conical tube, or an indexing scale is installed next to the conical tube. There are cone smooth surfaces and guide ribs (or flat surfaces) in the conical tube. ) two kinds. The float moves freely in the conical tube, or moves under the guidance of the ribs of the conical tube, and the instrument with the inner wall of the larger mouth and smooth surface is also guided by the guide rod. ②Metal conical tube float flowmeter: The diameter of the metal tube conical tube float flowmeter is 15~40mm, and the displacement of the float is transmitted to the conversion part outside the casing by means of magnetic steel coupling. Compared with the transparent conical tube rotameter. Can be used for higher media temperature and pressure, and is not easy to break. In addition, there are several other structures of the transparent rotameter. For example, the transparent straight tube rotameter is a deformation structure of the transparent conical tube rotameter, and the flow detection element is composed of an orifice plate and a conical floating plug. There are other types or variants of metal tube conical tube rotameters. Among them, the direct instruction type can directly observe and read the position of the float through the transparent straight pipe and the floating plug; the horizontal installation type can be installed in the horizontal pipe; Convenience; the floating plug orifice plate replaces the rotor conical tube with the floating plug orifice plate, and it is more convenient to change the flow specification as long as the floating plugs with different tapers are exchanged. (2) According to the function of the flowmeter: it can be divided into on-site indication, pneumatic remote signal output, electric remote signal output, alarm, etc. Transparent tube rotameters are all on-site indicating types. Sometimes a proximity switch is installed to output upper and lower limit alarm signals. The conversion part of the remote signal output type instrument converts the displacement of the float into a current or air pressure analog signal output, which is respectively a gas remote rotameter and an electric remote rotameter. (3) Classification according to the connection method with the pipeline: it can be divided into hose connection, flange connection and threaded connection. There are three connection methods for transparent tube rotameter. Among them, hose connection is often used for instruments with a diameter of 10mm or less and places with low working pressure; threaded connection is often used for instruments with a diameter of 40mm or less, which is not widely used; flange connection is used for Instruments with a diameter of 15~100mm are the most common applications. The metal tube rotameter is usually flanged, and individual models are threaded. (4) Classification according to the measured fluid: it can be divided into liquid, gas and steam. Most rotameters can measure both liquid and gas with the same instrument. Only specially designed metal tube rotameters can be used to measure steam, or additional components can be added to standard instruments, such as adding liquid damping parts with heat sinks, adding heat sinks at the connection with the indicating conversion part, etc. (5) Classification by use: it can be divided into basic type, jacket insulation type, explosion-proof type, corrosion-resistant type and blowing type. The base type is the most widely used. The jacket insulation type is used for occasions where the temperature in the pipeline is significantly higher (or lower) than the ambient temperature. When used for explosive gas or dust, the electric remote rotameter adopts explosion-proof type. At present, there are explosion-proof design structures and intrinsically safe explosion-proof design structures in China. The structural parts and floats of the corrosion-resistant rotameter in contact with the medium are made of engineering plastics such as polytetrafluoroethylene. The flow rate of the blowing type is small, the air is 20~3000L/h, the water is 0.3~100L/h,Precision is not required. The blowing type rotameter is integrated with a small self-operated differential pressure regulator, so that the flow change caused by the pressure fluctuation of the power source or the disturbance of the downstream parameter change can be adjusted by itself to maintain a constant flow. (6) Classification according to the passage of the tested fluid: it can be divided into full flow type and split flow type. The full flow type refers to the instrument in which all the fluid to be measured flows through the rotameter. The diverter type means that only part of the fluid to be measured flows through the flow detection part such as the float. The diverter type rotameter is composed of a standard orifice mounted on the main pipeline and a smaller diameter rotameter, and is used for larger flow rates with a pipe diameter greater than 50mm. and as long as the place is instructed. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Basic Principles and Common Types of Metal Tube Float Flow Meters'

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