Turbine flowmeter is a speed type instrument. It has the characteristics of small pressure loss, high accuracy, low starting flow, good shock resistance and anti-pulsation fluidity, wide range and easy maintenance. Turbine flowmeter places the turbine under test. In the fluid, when the gas enters the flowmeter, it is rectified and accelerated under the action of the special structure rectifier. Within a certain flow range, the angular velocity of the turbine is proportional to the flow rate. The electromagnetic induction principle is used to induce a pulse signal proportional to the volume flow of the fluid. After the signal is shaped by the preamplifier, the actual flow rate is obtained and displayed on the LCD screen. If the signal detected by the temperature and pressure sensor is input into the intelligent flow calculator for calculation processing, the flow rate under standard conditions will be obtained, and Displayed on the LCD screen.
Turbine flowmeter is a kind of impeller type instrument, its working principle is relatively simple. A turbine is placed in the center of the pipeline of the turbine flowmeter body, and both ends are supported by bearings. When the fluid passes through the pipeline, it impacts the turbine blades and generates a driving torque to the turbine, so that the turbine overcomes the friction torque and the fluid resistance torque to generate rotation. In a certain flow range Inside, for a certain fluid medium viscosity, the rotational angular velocity of the turbine is proportional to the fluid flow rate. Therefore, the fluid velocity can be obtained from the rotational angular velocity of the turbine, so that the fluid flow through the pipeline can be calculated.
At the same time, the turbine rotation speed is installed on the machine. The sensor coil outside the shell detects. When the turbine blade cuts the magnetic field lines generated by the permanent magnet steel in the shell, it will cause the magnetic flux in the sensor coil to change. The sensor coil sends the detected magnetic flux periodic change signal into The preamplifier amplifies and reshapes the signal, generates a pulse signal proportional to the flow rate, and sends it to the unit conversion and flow integration circuit to obtain and display the cumulative flow value; at the same time, it also sends the pulse signal to the frequency current conversion circuit to convert the pulse The signal is converted into an analog current quantity, which then indicates the instantaneous flow value.
Turbine flowmeter is a kind of speed-type flow meter. According to its transliteration, it is also called turbine flowmeter in China. Turbine flowmeters are divided into gas turbine flowmeters and liquid turbine flowmeters according to their different measuring media. Among various flow meters, the turbine flowmeter is the product with high repeatability and the best accuracy. Such as simple structure, fewer parts to be processed, light weight, convenient maintenance, large flow capacity (large flow through the same caliber) and adaptability to high parameters (high temperature, high pressure and low temperature).
Turbine flowmeters are widely used in the following measurement objects: petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas and cryogenic fluids. It is widely used in the transfer and gathering stations of foreign liquefied petroleum gas, refined oil and light crude oil, and the first and last stations of large crude oil pipelines for trade settlement.