The working principle of fretting mass flow meter

Abstract: The working principle information of the micro-motion mass flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. There are many kinds of flowmeters in the instrumentation industry. At present, the international standard for fretting mass flow meters has been officially announced. The micro-motion mass flowmeter is a flowmeter made according to the Coriolis acceleration theory. Its working principle is shown in Figure 3-15. There is a straight tube, and the angular velocity is measured. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the working principle of the micro-motion mass flowmeter. There are many kinds of flowmeters in the instrumentation industry. At present, the international standard for fretting mass flow meters has been officially announced. The micro-motion mass flowmeter is a flowmeter made according to the Coriolis acceleration theory. Its working principle is shown in Figure 3-15. There is a straight tube, which rotates in a plane around a fixed axis O with an angular velocity w, and there is a particle rn in the tube. It moves outward with velocity v along the straight tube. Since the mass point m is in a system with both rotational motion and linear motion, it will obtain two acceleration components: ① Centripetal acceleration a, whose value is rw^ 2 (r is the distance from the mass point m to the axis O), the direction points to the axis O. ② tangential acceleration ac, its value is 2uw. The direction is perpendicular to a, it comes from the rotating pipe, and at the same time produces a reaction force on the pipe. This reaction force is the Coriolis force, and its calculation formula is: F=2muw (3-8) In the formula: F is Coriolis Force, N;, w is the angular velocity, 1/s; u is the radial velocity in the rotating system, m/s, m ​​is the mass of the moving object, kg. If the density of the fluid is p, then any section of the pipeline △x The tangential Coriolis force above is: △F=2pA△xuw (3~9) where: A is the cross-sectional area of ​​the pipe. In the formula ((3-9), pAu is the self-care wolf flow of the fluid, which is set as QM'The formula (3-9) can be expressed as: △F= 2w△xQm (3-10) It can be seen from the above formula that as long as the Coriolis force △F is measured, the mass flow Qm can be known. This is the measurement principle of the micro-motion mass flowmeter. It has always been a difficult problem how to make an object moving in a straight line in a rotating system at the same time. Later, people used the method of pipeline vibration to replace the rotation, and developed a micro-motion mass flow sensor. The structure of the sensor is shown in Figure 3-16. It consists of three parts: a measuring tube, an electromagnetic driver and an electromagnetic (or photoelectric) detector. The sensitive element of the sensor is a measuring tube. tube, S-shaped tube,Ωshape tube, etc., but the measurement principle is the same. The electromagnetic driver makes the measuring tube vibrate at its natural frequency by exciting the coil, and the flowing fluid generates Coriolis force in the vibrating tube. Since the Coriolis force on the inflow side and the outflow side of the measuring tube is in opposite directions, the tube is twisted. , A phase difference proportional to the mass flow is generated on both sides of the outflow, and the phase difference is converted into a corresponding electrical signal output by an electromagnetic detector or a photoelectric detector. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Working principle of micro-motion mass flow meter'

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