Jinhu Weiye Instrument Co., Ltd. is dedicated to the production of intelligent turbine flow meters, smart electromagnetic flow meters and other instruments. Smart turbine flowmeters, which are the main types of speed flowmeters, use a multi-blade rotor (turbine) to sense the average flow rate of the fluid and to derive a flow or total meter.
How smart turbine flowmeters work Smart turbine flowmeters consist of turbines, bearings, preamplifiers, and display instruments.
The measured fluid impinges on the turbine blades and causes the turbine to rotate. The rotational speed of the turbine changes with the flow rate, that is, the flow rate is large, and the rotational speed of the turbine is also large. Then, the rotational speed of the turbine is converted into the electrical pulse of the corresponding frequency by the magnetoelectric conversion device. After the preamplifier is amplified, it is sent to the display meter for counting and display. The instantaneous flow rate and the accumulated flow rate can be calculated based on the pulse number and the accumulated pulse number in the unit time.
The working principle of the intelligent turbine flowmeter is that when the fluid flows along the axis of the pipeline and impacts the turbine blades, a force proportional to the product of the flow qv, the flow velocity V and the fluid density Ï acts on the blades to promote the rotation of the turbine. While the turbine is rotating, the blades periodically cut the magnetic lines of force generated by the electromagnets and change the magnetic flux of the coils. According to the principle of electromagnetic induction, a pulsed potential signal will be induced in the coil. The frequency of this pulse signal is proportional to the flow of the fluid being measured.
The pulse signal output by the turbine transmitter is amplified by the amplifier and sent to the display meter to measure the flow rate.
2 Selection of intelligent turbine flowmeter (1) The best turbine turbine flowmeter is best treated with 316 stainless steel for corrosion protection. If it is an explosion-proof zone, it must also be an explosion-proof result.
(2) The sensing probe detects the movement of the rotating body and converts it into a pulsed digital electrical signal. Its output voltage of the electromagnetic coil is close to a sinusoidal curve. The frequency range of the pulse signal varies linearly with the measured flow rate. The typical range is 10 : 1,25:1 and 100:1 three specifications. The resistance of the solenoid coil is generally less than 2000Ω, and if it is larger than this value, it may be damaged.
(3) Bearings generally have carbonized tungsten, polytetrafluoroethylene, and carbon graphite. Three specifications: The highest accuracy of tungsten carbide, it is used as a standard part of industrial control; PTFE, carbon graphite can be preserved, generally in chemical industry places priority . The square of the bearing life flow rate is positive and negative, so the best flow rate is 1/3 of the maximum flow rate.