Three rotor flowmeter

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1. What is a rotor flowmeter and what is its working principle? A rotor flowmeter is an instrument that measures fluid flow based on the principle of throttling. It maintains a constant differential pressure between the upper and lower parts of the rotor by changing the flow area of the fluid. Therefore, it is also known as a variable flow area constant differential pressure flowmeter or a float flowmeter. Working principle: The working principle of the rotor flowmeter is based on the variable area principle. It mainly consists of two components: one is a conical tube that gradually expands from bottom to top; The other one is a rotor (float) placed in a conical tube and can move freely along the centerline of the tube. 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. The magnitude of this force varies with the flow rate. When the flow rate is large enough, the force generated lifts the rotor and raises it. At the same time, the measured fluid flows through the annular section between the rotor and the conical tube wall. At this point, there are three main 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. At this point, all three forces acting on the rotor are parallel to the axis of the tube. When these three forces reach equilibrium, the rotor will smoothly float at a certain position inside the cone tube. This position is directly related to the flow rate of the fluid. Specifically, as the flow velocity in Laixiao Cave increases, the force acting on the rotor also increases, causing it to move upward; On the contrary, when the incoming flow velocity decreases, the rotor will move downward. The flow cross-sectional area at the corresponding position will also change until the flow velocity reaches a new equilibrium state. 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. Therefore, the flow rate of the fluid can be read by observing the position of the rotor. In practical applications, rotor flow meters are usually equipped with magnetic coupling devices and dials. When the rotor moves up and down inside the cone tube, the change in its position will be transmitted to the dial through the magnetic coupling device, indicating the current flow rate value. Image display: In summary, a rotor flowmeter is an instrument that measures fluid flow based on the principles of throttling and variable area. It maintains a constant differential pressure above and below the rotor by changing the flow area of the fluid, and reads the fluid flow rate by observing the position of the rotor. Due to its simple structure, accurate measurement, and convenient use, the rotor flowmeter has been widely used in the fields of industrial automation and process control.

2. Working principle of rotor flowmeter

The rotor flowmeter consists of two components, one of which is a conical tube that gradually expands from bottom to top;

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