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| Working principle of rotor flowmeter |
| 2012-12-19 16:36:01 |
The flowmeter, also known as a float meter, is a type of variable area flowmeter. It consists of a conical tube and a rotor (also called a float) which can be moved up and down freely inside the conical tube. The rotor flowmeter body can be connected to the measurement pipe with flanges, threads or hoses at both ends, and it is installed vertically on the measurement pipe. When the fluid flows into the cone from the bottom to the top, it is intercepted by the rotor. This creates a pressure difference between the rotor and the downstream. The rotor rises under the pressure difference. At this time, there are three forces acting on the rotor: Dynamic pressure, 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 and the tube axis of the cone tube coincide, and the three forces acting on the rotor are parallel to the tube axis. When these three forces reach equilibrium, the rotor floats smoothly at a position inside the cone. For a given rotor flowmeter, the size and shape of the rotor have been determined, so its buoyancy in the fluid and its own gravity are known to be constant. Only the dynamic pressure of the fluid on the float changes with the flow velocity. of. Therefore, when the incoming flow velocity becomes larger or smaller, the rotor will move upwards or downwards, and the flow cross-sectional area at the corresponding position will also change. Until the corresponding velocity when the flow velocity becomes balanced, the rotor will be stable at the new position. For a given rotor flowmeter, the position of the rotor in the cone tube corresponds to the flow rate of the fluid flowing through the cone tube.
This is the measuring principle of the rotor flow meter.