The glass rotor flowmeter is a variable area flowmeter, mainly composed of a vertically expanding glass cone tube from bottom to top and a float that can move up and down with the flow rate. It has the characteristics of simple structure, intuitive design, low pressure loss, and easy maintenance. It is mainly used in various departments such as chemical, petroleum, light industry, medicine, fertilizer, synthetic fiber, food, dye, environmental protection, and scientific research to measure the flow rate of single-phase non pulsating (liquid or gas) fluids.
working principle
The vertical position h of the float in the conical tube of the glass rotor flowmeter is positively correlated with the flow rate Q. 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, 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.
Operation usage
When using a flowmeter, the upstream valve should be slowly opened to full open first, and then the flow rate should be adjusted using the downstream regulating valve of the flowmeter. When the flow meter is stopped, the upstream valve of the flow meter should be slowly closed first, and then the flow regulating valve downstream of the flow meter should be closed.
2. The flowmeter must wait for the float to stabilize before reading the reading. Float reading position: The reading position is at the diameter of the float.
3. Avoid sudden changes in the temperature and pressure of the fluid being measured during use. Prevent the cone tube from breaking and injuring people.
4. If the cone tube or float is contaminated, it should be cleaned in a timely manner.
5. The working diameter and measuring sharp edges of the float should be recalibrated if there is any damage.
6. When disassembling the flowmeter, one should be familiar with its structure, especially when disassembling the cover and support plate bolts, uniform force should be applied to prevent breaking the cone tube.
7. When the density, temperature, pressure, and division state (i.e. standard state) of the fluid state passing through the flowmeter are different, the displayed values must be corrected.
8. The flow meter in use should be checked regularly. If leakage is found, the flow meter should be depressurized first, and then the cover should be evenly tightened to avoid the cover being too tight and crushing the cone tube.