Float flowmeter

Floater flowmeter, also known as rotameter, is a type of variable area flowmeter. In a vertical conical tube that expands from bottom to top, the gravity of a float with a circular cross-section is subjected to liquid power. The float can be The cone rises and falls freely inside. It moves up and down under the action of flow velocity and buoyancy. After balancing with the weight of the float, it is transmitted through the magnetic coupling to the dial to indicate the flow. Generally divided into glass and metal rotor flowmeter. The metal rotor flowmeter is the most commonly used in the industry. For small diameter corrosive media, glass is usually used. Due to the inherent fragility of the glass material, the key control point also uses a rotameter made of precious metals such as full titanium. . Rotameter is a variable area flow meter based on float position measurement. The all-metal structure, Modular concept design, its small pressure loss, large range ratio (10:1), easy installation and maintenance, can be widely used in flow measurement and process control of complex, harsh environments and various media conditions.

Rotor Flowmeter Features

Rotameters are the most commonly used flowmeters in industry and in the laboratory. It has a simple structure, intuitive, small pressure loss, easy maintenance and so on. The rotameter is suitable for measuring small flow through the pipe diameter D<150mm, and can also measure the flow of corrosive media. When used, the flow meter must be installed on a pipe section that runs vertically and the fluid medium flows through the rotameter from bottom to top.

Rotor flow meter working principle

The rotameter is composed of two parts. One part of the rotameter is a conical tube that gradually enlarges from bottom to top. The other part of the rotameter is a rotor that is placed in a conical tube and can move freely along the centerline of the tube. . Rotameter When measuring the flow of a fluid, the fluid to be measured flows from the lower end of the conical tube. The flow of fluid impinges on the rotor and generates a force on it (this force varies with the flow rate); when the flow is large enough The resulting force 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 and flows out from the upper end. The force acting on the rotor when the fluid to be measured flows is exactly equal to the weight of the rotor in the fluid (referred to as the display weight), and the rotor is in equilibrium and stays at a certain height. Analysis shows that the height of the rotor in the conical tube has a corresponding relationship with the flow rate. Therefore, by observing the position of the rotor in the conical tube, the corresponding flow rate can be obtained.

In order to make the rotor do not touch the pipe wall when moving down the center line of the conical pipe, two methods are usually adopted. One is to install a guide mandrel in the center of the rotor to keep the rotor in the center line of the conical pipe. Up and down movement, the other is to open a track chute on the edge of the rotor disk. When the fluid flows through the rotor from bottom to top, one side bypasses the rotor and passes through the chute to generate a reverse thrust, so that the rotor does not go around the centerline. Stopping the ground can keep the rotor from hitting the wall when it is working. Rotor flowmeter rotor material can be made of stainless steel, aluminum, bronze, etc.