Turbine meter work principle and structure

The work and the structure principles of the turbine flowmeter 1. The working principle of gas turbine flowmeter gas turbine flowmeter is put the turbine flow in the body, when the gas flow into the timing, in the role of the special structure of the rectifier rectifier and accelerate, within a certain range of traffic is directly proportional to the angular velocity and flow rate of the turbine. Using the electromagnetic induction principle induction is proportional to the fluid volume flow out of the pulse signal, the signal amplified by preamplifier, plastic after will get the actual flow, and displayed in the LCD screen: if the same temperature and pressure sensors detect the signal of input processing of intelligent flow totalizer. especially will receive a standard condition of traffic, and display on the LCD screen. 2. Gas turbine flowmeter flowmeter is a kind of structure of impeller speed flowmeter, turbine flowmeter, shunt rotor flow meter, water meter and impeller anemometer, etc. Time turbine flow impeller type flowmeter, the main varieties in the world has a history of nearly half a century of industrial application from 60 s production in our country, has formed the whole series instrument. It used in the impeller rotating angular velocity and fluid in the fluid flow rate is proportional to the relationship, by measuring the rotating speed of the impeller to reflect the size of the volume flow through a pipe, is now more mature and high precision instrument flow meter. Turbine meter display instrument with a turbine flow sensor and traffic composition, which can realize the instantaneous flow and cumulative flow measurement. Sensor output is proportional to the flow of the pulse frequency signal, the signal transmitted by transmission lines from the instrument, facilitate the accumulative and display. Moreover sensor output pulse frequency of the signal can be alone with the use of computer matching, display instrument with a computer instead of traffic density or temperature and pressure compensation, according to mass flow or gas volume flow. This kind of instrument is suitable for the measurement of the total fluid. Today, the turbine flowmeter has been in the petroleum, chemical industry, scientific research, national defense and measurement and so on various departments for a wide range of applications. 3. The structure of the turbine flow sensor ( 1) The structure of the turbine flow sensor as mentioned above, the turbine flow sensor structure is mainly composed of shell, diverter, impeller ( Turbine) , bearing and signal detection amplifier, etc. As shown in the figure below ( 2) Role of parts of flowmeter in 1) Instrument housing generally USES not permeability instrument shell made of stainless steel or hard alloy for large caliber sensors can also use the Mosaic structure of the combination of carbon steel and stainless steel. Shell is the main part of the sensor components, it plays by measurement of body pressure, fixed installation testing components, piping, 売 body filled with fluid director, impeller, shaft, bearing, there are signal detection amplifier shell outer wall installation. 2) Diverter diverter is usually choose not permeability stainless steel or hard aluminium material production, installed in the import and export, sensor orientation on fluid rectifier and support the role of the impeller, avoid the fluid disturbance on the impeller (3) the influence of Turbine which is also called the impeller, generally made of high magnetic conductivity materials ( Such as 2 cr13 or Cr17Ni2) , is the sensor detection components. Its role is to put the fluid kinetic energy is converted into mechanical energy. Impeller by straight blade, spiral blade and jump is to wait for a few kinds, also can use many magnetizer are embedded porous shield ring to increase a certain amount blade turbine rotating frequency. 4) Shaft and bearing usually choose stainless steel ( Such as 2 cr13, 4 cr13, Cr17Ni2 or 1 cr18ni9ti, etc. ) Or hard alloy, they form a pair of kinematic pair, support and guarantee for the impeller to rotate. It needs to have enough stiffness, strength and hardness, wear resistance, corrosion resistance, etc. It determines the reliability and service life of the sensor. Sensor failure is usually caused by shaft and bearing, so its structure and the selection of materials and maintenance is an important problem. 5) Signal detection amplifier domestic commonly used signal detection amplifier adopts variable reluctance type, it is composed of * magnetic steel, magnetic rods, coils, etc. Its role is to put the turbine machinery rotation signal into electrical signal output. Because * magnets will appeal to high permeability material of blade and magnetic torque, for small sensors in the small flow rate, the magnetic resistance torque in the torque as the main item, therefore * magnetic steel can be divided into two kinds of specifications size, small small specification in order to reduce the magnetic resistance torque. Generally, coil induction signal is small, pledged to thousands of amplifier amplification, plastic electrical pulse signal, the output amplitude when the coil output signal effective value in more than 10 mv may also directly with the flow computer.

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