The glass rotor flowmeter consists of two components, one of which is a conical tube that gradually expands from bottom to top; The other component of the rotor flowmeter is a rotor that is placed in a conical tube and can move freely along the centerline of the tube. When measuring the flow rate of a fluid with a rotor flowmeter, 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, and exits from the upper end. When the force acting on the rotor during the flow of the measured fluid is exactly equal to the weight of the rotor in the fluid (known as the displayed weight), the force on the rotor is in equilibrium and stays at a certain height. Analysis shows that; The position and height of the rotor in the conical tube correspond to the flow rate it passes through. Therefore, by observing the position and height of the rotor in the conical tube, the corresponding flow rate value can be obtained.
In order to prevent the rotor from touching the pipe wall when moving up and down on the centerline of the conical tube, two methods are usually used: one is to install a guide core rod at the center of the rotor to keep the rotor moving up and down on the centerline of the conical tube, and the other is to open a groove at the edge of the rotor disk. When the fluid flows through the rotor from bottom to top, it bypasses the rotor while passing through the groove to generate a reverse thrust, causing the rotor to continuously rotate around the centerline, thus keeping the rotor from touching the pipe wall during operation. The rotor material of the rotor flowmeter can be made of stainless steel, aluminum, bronze, etc.