EnglishGlass is often used in occasions with certain requirements for light and color, such as optical instruments and various artistic decorations, because it has light transmission and reflection, and is easy to color. Modern technology has not only brought new vitality and energy to the glass industry, but also greatly improved the performance of glass. We will briefly introduce the functions and characteristics of glass rotameter and explain how to select it.
1、 Functions and characteristics of glass rotameter
The function of glass rotameter is to measure flow
main features
Small pressure loss, reliable performance, simple structure, convenient installation and use, and low price
Structural principle
The main measuring elements of the flowmeter are a vertically installed lower small and upper large conical glass tube and a float that can move up and down inside When the fluid passes through the conical glass tube from bottom to top, there is a pressure difference between the top and bottom of the float, and the float rises under the action of this pressure difference When the rising force, buoyancy and viscous lift of the float are equal to the gravity of the float, the float is in the equilibrium position Therefore, there is a certain proportional relationship between the fluid flow through the flowmeter and the rising height of the float, that is, with the flow meter area of the flowmeter, and the position height of the float can be used as a flow measurement
2、 How to choose glass rotameter
Glass rotameter can be divided into eight series according to its purpose and scope of application: ordinary type, ribbed pipe type, small flow and small shape type, corrosion-resistant type, laboratory type, thermal insulation type, start-up emergency signal type and high pressure resistant type According to the instrument series type spectrum formulated by the state, no matter which series, it is better to include 12 caliber numbers from 1mm to 100mm. The measurable flow range is: liquid (water) 0.1 ml / min ~ 40 m3 / h, gas (air) 1 ml / min ~ 1000 m3 / h The diameter of glass rotameter used for environmental protection instruments is generally no more than 10mm, and the measured flow belongs to the small flow range The selection of glass rotameter can be considered from the following aspects
1. Measured object That is to measure the type of medium, pressure and chemical properties For liquid medium and gas medium, corrosion-resistant flowmeter shall be selected for corrosive medium
2. Flowmeter performance After the above conditions are determined, generally speaking, if the price does not change greatly, the needle valve placed on the upper part of the flowmeter can be preferred; There is a very large flow hole, which is directly calibrated; Simple structure; Smaller external size, etc In case of small flow range, ball float type can be selected, because it is stable in measurement, not easy to accumulate dust, high precision and good interchangeability
3. Select according to the price Generally speaking, the price of high precision is high The accuracy grade of the instrument shall be selected according to the measurement purpose. If only the passing volume of the measurement medium needs to be controlled and adjusted through trial operation, and the passing volume needs to be stabilized all the time in the future, then the accuracy is secondary
Related concepts
Flowmeter
The English name of flowmeter is flowmeter, which is defined by the national science and technology terminology Approval Committee as an instrument indicating the measured flow and / or the total amount of fluid within the selected time interval. Simply put, it is an instrument used to measure the fluid flow in pipelines or open channels. Flow meters are also divided into differential pressure flow meters, rotameters, throttling flow meters, slit flow meters, volumetric flow meters, electromagnetic flow meters, ultrasonic flow meters, etc. Classification by medium: liquid flowmeter and gas flowmeter.
rotor
Rotor is a scientific and technological term, which refers to the rotating body supported by bearings. It is mostly the main rotating parts of power machinery and working machinery. An object such as an optical disc that does not have a rotating shaft can be regarded as a rotor when a rigid connection or additional shaft is adopted.
