The glass rotameter is a variable area flowmeter . It consists of a vertical glass funnel that expands from bottom to top and a float that can move up and down with the flow rate. Because there is a certain functional relationship between the flow rate through the flow meter and the rising height of the float (ie , the flow area of ​​the flow meter ), the height position of the float can be used as a measure of the flow rate. Suitable for measuring the flow of single-phase non-pulsating fluids (liquid or gas). Glass Rotameter is widely used in chemical, petroleum, light industry, medicine, environmental protection, food and measurement testing, scientific research and other departments to measure the flow of single-phase non-pulsating fluid (liquid or gas).
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Glass Rotameters are the most commonly used flowmeters in industry and laboratories . It has a simple structure, intuitive, small pressure loss, easy maintenance and so on. The glass rotor flowmeter is suitable for measuring small flow through the pipe with a diameter of 150mm, and it can also measure the flow of corrosive media. When used, the flowmeter must be mounted on a pipe section that runs vertically and the fluid medium passes through from bottom to top. The main measuring elements of the glass rotameter are a vertically mounted lower large and large cone-shaped glass tube and a float that can move up and down. When the fluid flows from the bottom up through the conical glass tube, a pressure difference occurs between the upper and lower floats, and the float rises under the differential pressure. When this rising force, the buoyancy and the viscous lift of the float are equal to the weight of the float, the float is in equilibrium. Therefore, there is a certain proportional relationship between the flow rate of the fluid flowing through the glass rotameter and the rising height of the float, ie , the flow area of ​​the glass rotameter , and the height of the float can be used as the flow rate measurement.
Glass Rotary Flowmeter Working Principle
The glass rotameter consists of an upwardly expanding conical tube and a float in the tube. The vertical position h of the float in the conical tube is in one-to-one correspondence with the flow Q. The glass rotameter consists of two components. The glass rotameter is a conical tube that gradually expands from the bottom up; the other part of the glass rotameter is placed in a conical tube and can be freely lowered along the centerline of the tube. The moving rotor. When measuring the flow rate of the fluid, the fluid to be measured flows in from the lower end of the conical tube, and the flow of the fluid impacts the rotor and generates a force (the magnitude of this force varies with the flow rate); when the flow rate 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. When the measured fluid flows, the force acting on the rotor 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.
Glass Rotameter is widely used in chemical, petroleum, light industry, medicine, environmental protection, food and measurement testing, scientific research and other departments to measure the flow of single-phase non-pulsating fluid (liquid or gas).
Glass rotameter has strong corrosion resistance, can detect acid (except hydrofluoric acid), alkali, oxidant and other corrosive gas or liquid flow, glass rotor flowmeter is suitable for chemical, pharmaceutical, paper, sewage treatment Other industries.
Operation glass rotameter
1. When using the flowmeter , slowly open the upstream valve to full open, and then use the flow control valve downstream to adjust the flow. When the flowmeter is stopped, it is necessary to slowly close the flowmeter upstream valve and then close the flow control valve downstream of the flowmeter .
2, the flow meter must wait until the float is stable before reading the indication. Float reading position: The maximum diameter of the float is reading position.
3. When using, avoid abrupt changes in temperature and pressure of the fluid under test. Prevent the cone from breaking and hurting people.
4, such as cone tube, floats should be cleaned in time.
5, the working diameter of the float and the measurement of sharp edges, if any damage should be re-calibrated.
6. When the flow meter needs to be disassembled, it should be familiar with its structure, especially when disassembling the gland and supporting plate bolts, it should be used evenly to prevent breaking the cone.
7. When the density, temperature, pressure, and indexing state of the fluid state of the flowmeter are different (ie, the standard state), the indication must be corrected.
8. The flowmeter in use should be inspected regularly. If there is leakage, the flowmeter should be decompressed first , then the gland should be tightened evenly, and the gland should be avoided.
The working principle and use of glass rotor flowmeter