rotor flow meter
Feb 10, 2022| rotor flow meter
How it works: When measuring the flow of a fluid, the measured fluid flows in from the lower end of the conical tube. The flow of the fluid impinges on the rotor and exerts a force on it. When the flow is large enough, the force will lift the rotor. At the same time, the measured flow body flows through the annular section between the rotor and the conical pipe wall, then the action on the rotor has three forces: fluid dynamic pressure on the rotor, the rotor in the fluid buoyancy, and rotor gravity. When the flowmeter is installed vertically, the center of gravity of the rotor and the cone tube axis will coincide, and the three forces acting on the rotor are parallel to the direction of the tube axis. When these three forces reach equilibrium, the rotor floats smoothly in a position inside the cone. For a given rotameter, the size and shape of the rotor have been determined, so its buoyancy in the fluid and its own gravity is known to be constant, only the dynamic pressure of the fluid on the float changes with the size of the flow velocity. Therefore, when the incoming flow velocity becomes larger or smaller, the rotor will move up or down, and the flow cross-sectional area at the corresponding position will also change until the flow velocity becomes the corresponding speed at equilibrium, and the rotor will be stable at the new position. For a given rotameter, the position of the rotor in the conical tube corresponds to the amount of fluid flowing through the conical tube.
Working features: it has the characteristics of simple structure, intuitive, small pressure loss, convenient maintenance, etc. Rotameter is suitable for measuring the small flow through the pipe diameter D<150mm, can also measure the flow of corrosive media; The flowmeter must be installed in the vertical direction of the pipe section, and the fluid flow through the rotameter from top to bottom.
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