What is the working principle of a turbine flowmeter?

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What is the approximate price of a rotor flowmeter?

2. What is the working principle of a turbine flowmeter? The 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 virtual excitation coil sends the detected periodic change signal of the magnetic flux to the preamplifier, amplifies and shapes the signal, generates a pulse signal proportional to the flow velocity, and sends 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 quantity and indicates the instantaneous flow rate value. The tested fluid impacts the turbine blades, causing the turbine to rotate. The rotational speed of the turbine changes with the flow rate, that is, as the flow rate increases, the rotational speed of the turbine also increases. The rotational speed of the turbine is then converted into electrical pulses of the corresponding frequency by a magneto electric conversion device, amplified by a preamplifier, and sent to a display instrument for counting and displaying lesions. Based on the number of pulses per unit time and the cumulative number of pulses, the instantaneous flow rate and cumulative flow rate can be calculated.

3. Working principle of intelligent turbine flowmeter

Working principle: When a cylin

drical resistance body is vertically inserted into the fluid to destroy the bridge, vortices will be alternately generated on both sides. As the fluid moves downstream, a vortex column is formed, called the Karman vortex street, as shown in Figure 1.

. The resistance body that generates vortex streets is called a vortex generator. Experimental results have shown that the frequency of vortices is directly proportional to the flow velocity, which can be expressed as follows: Experimental results have shown that when the distance h between two vortices and the distance L between two vortices in the same column satisfy the formula h/|=0.281, an asymmetric vortex column can maintain a stable state. When the Reynolds number Re of the fluid is in the range of 5000-150000, Sr remains basically unchanged. Therefore, when the cylinder width d and Strouhal number Sr of the vortex generator are constant, the frequency of the vortex generator is proportional to the average flow velocity of the fluid, that is, proportional to the flow rate Q and independent of parameters such as pressure, temperature, and density. When a vortex is generated on both sides of the cylinder, the sensor is subjected to alternating lift perpendicular to the flow direction to generate a signal. The frequency of the change in lift is the vortex frequency. The sensor amplifies and shapes the signal through a converter to obtain a pulse bridge residual impulse signal that is linearly proportional to the flow velocity, which is directly output or converted into a 4.20mA standard signal output. The relationship between flow rate Q and frequency is as follows:

What is the working principle of a turbine flowmeter?

What is the approximate price of a rotor flowmeter?

3. Working principle of intelligent turbine flowmeter

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