The principle and introduction of different tubular mass flowmeters

The principle and introduction of different tubular mass flowmeters As shown in the figure, the measurement system of this flowmeter consists of two parallel S-shaped measuring tubes, a driver and a sensor. The two ends of the tube are fixed, and the center of the tube is equipped with a driver to make the tube vibrate. Sensors are installed at the symmetrical positions of the measuring tubes, and the relative displacement between the vibrating tubes is measured at these two points. The mass flow is proportional to the phase difference of the oscillation frequencies measured at these two points. The degree of distortion of the measuring tube is proportional to the mass flow rate of the fluid flowing through the measuring tube. Electromagnetic sensors are installed on the measuring tubes on both sides of the driving point to measure the phase difference of its movement. 

This phase difference is directly proportional to the flow rate. passing mass flow. In the double U-shaped measuring tube structure, the vibration directions of the two measuring tubes are opposite, so that the twisting phase of the measuring tubes differs by 180 degrees, as shown in the figure. Compared with the single-measurement tube type, the detection signal of the double-tube type is amplified, and the flow capacity is also improved. The degree of distortion of the measuring tube is proportional to the mass flow rate of the fluid flowing through the measuring tube. Electromagnetic sensors are installed on the measuring tubes on both sides of the driving point to measure the phase difference of its movement. This phase difference is directly proportional to the flow rate. passing mass flow. In the double U-shaped measuring tube structure, the vibration directions of the two measuring tubes are opposite, so that the twisting phase of the measuring tubes differs by 180 degrees, as shown in the figure. Compared with the single-measurement tube type, the detection signal of the double-tube type is amplified, and the flow capacity is also improved. When the fluid in the measuring tube flows at a certain speed, the fluid in the measuring tube will produce a Coriolis force effect due to the existence of vibration. The Coriolis force acts on the measuring tube, but the direction of the Coriolis force generated on the upper and lower tubes is different, and the straight tube part of the tube produces different additional motions, that is, a phase difference of relative displacement. The flow measurement system consists of two B-shaped tubes parallel to each other. The fluid to be measured is evenly sent into two B-shaped measuring tubes through the flow divider. The driving device is installed in the center between the two tubes, and drives the measuring tube to vibrate at a stable harmonic frequency. When the measuring tube moves outward, as shown in the figure, the straight tube parts are pushed away from each other, and the loops L1' and L1'' are close to each other under the action of the driver, and the loops L2' and L2'' are also close to each other. Since each loop is fixed at one end to the meter body, rotational motion is restrained at the end regions and thus concentrated near the nodes.

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