Hefei turbine flowmeter | What kind of flowmeter is a turbine flowmeter?

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1. The turbine flowmeter measures the operating flow rate.

For example, may I ask what is the gas measurement range of a DN50 turbine flowmeter, and what is the typical volumetric flow measurement range for operating conditions in m3/h? Solution: Application formula: Flow rate=Flow rate * Square of pipeline diameter/Minxian 354. The lower limit flow rate is 1.5 * 50 * 50/354=10.6 m3/h, and the upper limit flow rate is 30 * 50 * 50/354=212 m3/h. Turbine flowmeter measures gas flow in the range of 1.5~30m/s. Vortex flowmeter measures gas flow rate in the range of 3~60m/s.

2. What kind of flowmeter is a turbine flowmeter? The turbine flowmeter consists of a turbine, bearings, preamplifier, and display instrument. The principle of a turbine flowmeter is to place a turbine in the center of a pipeline, supported by bearings at both ends. When the fluid passes through the pipeline, it impacts the turbine blades, generating a driving torque for the turbine, causing it to overcome friction torque and fluid resistance torque and rotate. Within a certain flow range, for a certain viscosity of the fluid medium, the rotational angular velocity of the turbine is proportional to the fluid flow velocity. Therefore, the fluid flow velocity can be obtained from the rotational angular velocity of the turbine, and the fluid flow rate through the pipeline can be calculated. The rotational speed of the turbine is detected by a sensing coil installed outside the casing. When the turbine blades cut the magnetic field lines generated by the permanent magnetic steel inside the casing, it will cause changes in the magnetic flux in the sensing coil. The sensing coil sends the detected magnetic flux periodic change signal to the preamplifier. amplify and shape the signal, Generate a pulse signal proportional to the flow rate, send it to the unit conversion and flow accumulation circuit to obtain and display the accumulated flow value; At the same time, the pulse signal is also sent to the frequency current conversion circuit, which converts the pulse signal into an analog current and indicates the instantaneous flow rate value. The measured fluid impacts the turbine blades, causing the turbine to rotate. The speed of the turbine changes with the change of flow rate, that is, when the flow rate is high, the speed of the turbine is also high. Then, the speed of the turbine is converted into electrical pulses of corresponding frequency by the magneto electric conversion device. After amplification by the preamplifier, it is sent to the display instrument for counting and display. The instantaneous flow rate and cumulative flow rate can be calculated based on the number of pulses and cumulative pulses per unit time. The working principle of a 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, flow velocity V, and fluid density ρ acts on the blades, driving the turbine to rotate. While the turbine rotates, the blades periodically cut the magnetic field lines generated by the electromagnet, changing the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating electric potential signal will be induced in the coil. The frequency of this pulsating signal is proportional to the flow rate of the measured fluid, where qv is the total volume of the fluid and N is the total number of pulsations generated b

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