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# How do we make a breakthrough in the original technology of the rotameter

by：Sure     2021-08-20
We should all need to understand that the rotameter is the most commonly used flowmeter in industry and laboratories. Float flowmeter, also known as rotameter, is a kind of variable area flowmeter. In a vertical cone tube that expands from bottom to top, the gravity of the float of circular cross section is borne by the hydrodynamic force, and the float can be The cone tube rises and falls freely. We should all need to understand the difference between the two. Rotameter is the most commonly used flowmeter in industry and laboratories. Float flowmeter, also known as rotameter, is a kind of variable area flowmeter. In a vertical cone tube that expands from bottom to top, the gravity of the float of circular cross section is borne by the hydrodynamic force, and the float can be The cone tube rises and falls freely. What is the difference between the two? This is an issue that deserves our attention. It moves up and down under the action of flow velocity and buoyancy, and after balancing with the weight of the float, it is transmitted to the dial to indicate the flow rate through a magnetic coupling. Generally divided into glass and metal rotameters. The metal rotameter is the most commonly used in the industry. For small diameter corrosive media, glass is usually used. The sub-flowmeter consists of two parts. One rotameter is a tapered tube that gradually expands from bottom to top; rotor flow The other part of the meter is a rotor that is placed in a tapered tube and can move freely up and down along the center line of the tube. When measuring the flow of fluid, the measured fluid flows in from the lower end of the tapered tube, and the flow of fluid impacts the rotor and generates a force on it; when the flow rate is large enough, the force generated will hold the rotor up , And make it rise. It has the characteristics of simple structure, intuitiveness, low pressure loss and convenient maintenance. When the measured fluid flows, the force on the rotor is exactly equal to the weight of the rotor in the fluid, and the rotor is in a balanced state and stays at a certain height. Therefore, the measured fluid flows through the annular section between the rotor and the tapered tube wall, and flows out from the upper end. Due to the fragility of the glass material itself, the key control point can also use a rotameter made of precious metals such as all-titanium material to observe the position of the rotor in the conical tube, and the corresponding flow value can be obtained. Rotameter is suitable for measuring small flow through pipe diameter D<150mm, and it can also measure the flow of corrosive medium. When in use, the flowmeter must be installed on a vertical pipe section, and the fluid medium passes through the rotameter from bottom to top.
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