How the turbine works
The turbine flowmeter consists of a turbine, a bearing, a preamplifier, and a display instrument.
The turbine flowmeter houses a turbine in the center of the pipe, supported at both ends by bearings. When the fluid passes through the pipeline, it impacts the turbine blades, generating a driving torque to the turbine, causing the turbine to rotate against the frictional torque and the fluid resistance torque. In a certain flow range, for a certain fluid medium viscosity, the rotational angular velocity of the turbine is proportional to the fluid flow rate. Thus, the fluid flow rate can be obtained by the rotational angular velocity of the turbine so that the fluid flow through the pipe can be calculated.
The speed of the turbine is detected by a sensing coil mounted outside the casing. When the turbine blade cuts the magnetic lines of force generated by the permanent magnet in the casing, it causes the magnetic flux in the sensing coil to change. The sensing coil sends the detected magnetic flux cycle change signal to the preamplifier, amplifies and shapes the signal, generates a pulse signal proportional to the flow rate, and sends it to the unit conversion and flow total calculation circuit to obtain and display the cumulative flow value; At the same time, the pulse signal is also sent to the frequency current conversion circuit to convert the pulse signal into an analog current amount, thereby indicating the instantaneous flow value.