Flow meters are the eyes of industrial production, closely related to the national economy, national defense construction, and scientific research. They occupy an important position and role in the national economy and can be used for measuring the flow rate of gases, liquids, steam and other media.

7. Rotary flowmeter

rotameter

Working Principle:When measuring the flow rate of a fluid, the measured fluid flows in from the lower end of the conical tube, and the flow of the fluid impacts the rotor, generating a force on it. When the flow rate is large enough, the force generated lifts the rotor. At the same time, the measured fluid flows through the annular section between the rotor and the conical tube wall, and there are three forces acting on the rotor: the dynamic pressure of the fluid on the rotor, the buoyancy of the rotor in the fluid, and the gravity of the rotor itself. When the flowmeter is installed vertically, the center of gravity of the rotor coincides with the axis of the cone tube, and the three forces acting on the rotor are parallel to the axis of the tube. When these three forces reach equilibrium, the rotor floats smoothly at a certain position inside the cone tube. For a given rotor flowmeter, the size and shape of the rotor have been determined, so its buoyancy and self gravity in the fluid are known to be constants, only the dynamic pressure of the fluid on the float varies with the magnitude of the incoming flow velocity. Therefore, when the incoming flow velocity increases or decreases, the rotor will move upward or downward, and the flow cross-sectional area at the corresponding position will also change until the flow velocity reaches equilibrium at the corresponding speed, and the rotor will stabilize at the new position. For a given rotor flowmeter, the position of the rotor in the cone tube corresponds one-to-one with the flow rate of the fluid passing through the cone tube.

Job characteristics:It has the characteristics of simple structure, intuitive design, low pressure loss, and easy maintenance; Rotary flowmeter is suitable for measuring the diameter of pipelines passing through it