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DC-LWGY series turbine flowmeter principle and selection method

DC-LWGY series turbine flowmeter principle and selection method

由涡轮、轴承、前置放大器、显示仪表组成。 Turbine flowmeter consists of turbine, bearing, preamplifier and display instrument.
The measured fluid impacts the turbine blades, causing the turbine to rotate, and the rotation speed of the turbine changes with the change in flow rate, that is, the flow rate is large, and the rotation speed of the turbine is also large. After the preamplifier is amplified, it is sent to the display instrument for counting and display. The instantaneous flow rate and accumulated flow rate can be obtained according to the number of pulses and the accumulated pulse number in a unit time.
qv 、流速 V 和流体密度ρ乘积成比例的力作用在叶片上,推动涡轮旋转。 The working principle of the turbine transmitter 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 rate qv , the velocity V and the fluid density ρ acts on the blades, pushing the turbine to rotate. While the turbine is rotating, the blade periodically cuts the magnetic lines of force generated by the electromagnet, changing the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating potential signal will be induced in the coil, and the frequency of this pulsating signal is proportional to the flow rate of the measured fluid.
The pulse signal output by the turbine transmitter is amplified by the pre-amplifier and sent to the display instrument to realize the flow measurement.
Selection of turbine flowmeter
316 不锈钢材料以防腐,如是防爆区还必须是防爆结果。 (1) The 316 stainless steel material of the flow meter body should be selected as far as possible to prevent corrosion. If it is an explosion-proof area, it must also be an explosion-proof result.
10:1 25:1 100:1 三种规格。 (2) The inductive probe detects the motion of the rotating body and converts it into a pulsed digital electrical signal. Its electromagnetic coil voltage output value is close to a sine curve. The frequency range of the pulsed signal changes linearly with the measured flow rate. The typical range is 10 : 1 , 25: 1 and 100: 1 . 2000 Ω,大于该值可能损坏。 The resistance of the electromagnetic coil is generally less than 2000 Ω, and it may be damaged if it is larger than this value.
(3) Bearings generally have three specifications of tungsten carbide, polytetrafluoroethylene, and carbon graphite: tungsten carbide has high accuracy, which is used as a standard component for industrial control; polytetrafluoroethylene, carbon graphite can be anticorrosive, and it is generally preferred in chemical sites. . 1/3 速度比较好。 The life of the bearing is proportional to the square of the flow rate, so a good flow rate is better at 1/3 of the maximum flow rate .

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