Different functions of mass flow meters are divided into various types

The different functions of the mass flowmeter are divided into various types. The mass flowmeter is a commonly used flow measuring instrument, which directly measures the medium passing through the flowmeter, and can also measure the temperature of the medium indirectly by measuring the density meter of the medium. It is widely used in many fields. What are the common types of mass flow meters? The following editor will introduce the classification of mass flow meters in detail, hoping to help everyone. There are many types of direct mass flow meters, such as calorimetric type, angular momentum type, gyro type and double impeller type. This kind of instrument is suitable for measuring small flow gas. The disadvantage is that it is inert. The measured value is related to the constant pressure specific heat of the gas. The measuring element is in contact with the medium and is easily stained and corroded. It is a double-orifice differential pressure mass flow meter. Install two identical orifice plates at pipes A and B. Two identical constant-flow pumps that produce a constant volumetric flow q in opposite directions are installed in the splitter pipeline. Pressure difference before and after the two orifice plates △P=P1-P3=4Kρ,andρ, Q is proportional. where K is a constant coefficient,ρis the density, Q is the pipe volume flow rate,ρQ is the mass flow rate. The double-impeller mass flowmeter installs two impellers with inclination angles of x1 and x2 on the same straight line. The two impellers are connected by a torsion spring. There is a relationship between the moment difference △M between the impellers and the mass flow Qm, flow velocity u, inclination x1, x2 △M=Qm*u*(k1*tgx1-k2*tgx2) (k1 and k2 are blade structure size constants), △M =k3*u*Qm, (k3=k1*tgx1-k2*tgx2). Offset angle x=k4*△M=k4*k3*Qm*u; while the rotation speed U of the impeller group is proportional to the flow velocity of the fluid, U=k6*u, then the time required for the entire impeller group to rotate through the deflection angle x of the two impellers △t=x/U=k7*Qm. The mass flow rate Qm can be obtained by measuring △t through the counter. There are three main types of indirect mass flowmeters: the combination of velocity flowmeter and density meter, the combination of throttling (or target) flowmeter and volumetric flowmeter, the combination of throttling (or target) flowmeter and Density meter combination. There is also a method to convert the measured value of the volume flowmeter into the volume flow under the standard state according to the working pressure and temperature of the fluid. However, it cannot give accurate mass flow rate when the type or composition of the medium is changed. Strictly speaking, it is not a mass flow meter. Output density, specific gravity, volume flow, mass flow, mass energy flow, etc., and have multiple functions such as indication, analog output, printing, over-limit alarm, and instrument failure alarm. The basic principle of the thermal mass flowmeter is to use an external heat source to heat the measured fluid in the pipeline. The heat energy flows with the fluid, and the mass flow rate of the fluid is reflected by measuring the heat (temperature) change caused by the fluid flow. When the fluid composition is determined, the specific heat of the fluid at constant pressure is a known constant. Therefore, it can be seen from the above formula that if the heating power is kept constant, the mass flow rate can be obtained by measuring the temperature difference; if the constant temperature difference method is used, that is, the temperature difference between two points is kept constant, the mass flow rate can also be obtained by measuring the heating power. Because the constant temperature difference method is relatively simple and easy to implement, it has many practical applications. This flowmeter is mostly used for the measurement of large gas flow. In order to prevent the temperature measuring and heating elements from being stained and corroded by the fluid due to direct contact with the measured fluid, a non-contact measurement method can be used, that is, the heater and temperature measuring elements are installed outside the thin-walled tube, and the fluid is drawn from the inside of the thin-walled tube pass. Non-contact measurement method, suitable for small flow measurement of small diameter pipelines. When used for large flow measurement, the method of shunting can be used, that is, only part of the flow is measured, and then the total flow is obtained to expand the range of measurement. The differential pressure mass flowmeter is a flowmeter based on the Magnus effect. In practical applications, the combination of an orifice plate and a quantitative pump is used to achieve mass flow measurement. There are two common structures of double-orifice plate and four-orifice plate combined with quantitative pump. Coriolis mass flowmeter (referred to as Coriolis force flowmeter) is an instrument that directly measures the mass flow rate by using the principle of the Coriolis force proportional to the mass flow rate generated by the fluid flowing in the vibrating tube. There are many forms of Coriolis flowmeter structure, generally composed of a vibrating tube and a converter. The vibrating tube (measuring pipe) is a sensitive device with U-shaped,ΩThere are several shapes such as shape, ring, straight pipe and spiral, and there are also double pipes, etc., but the basic principle is the same.

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