The working principle and structure of the turbine flowmeter

Working principle of the turbine flowmeter and the turbine flowmeter is a kind of typical structure of speed meter. It has high measurement precision, fast response and high voltage, and therefore is widely applied in industrial production. Turbine flowmeter is based on the principle of fluid momentum conservation work. Be turbine blades make turbine rotating flow within a certain range, the turbine speed is proportional to the average flow velocity of fluid, by magnetoelectricity conversion device to turbine speed into electrical signal, after amplification to display record instrument, which can be derived by the current body of instantaneous flow and cumulative flow structure of the turbine flowmeter, as shown in the figure is mainly composed of 売 body, diverter, bearing of turbine and magnetoelectric transducer. Turbine is measuring element, by magnetic conductivity better stainless steel, depending on the flow meter in diameter, it is equipped with 2 ~ 8 slices spiral blades, bearing on the small bearing friction. To improve the responsiveness of velocity change, the quality of the turbine to be as small as possible. Diverter consists of guide plate and guide seat, used to guide fluid and bearing turbine, lest by fluid vortex change fluid and the effect of turbine blade Angle, so as to ensure the accuracy of the flow. Magnetoelectricity conversion device is composed of coil and magnet steel, installed on the meter shell, it can be divided into magnetic resistance type and induction type two kinds. Magnetic resistance type magnetic steel is placed within the sensing line sha-lu, turbine blade made of magnetic materials. When under the turbine blades rotate through the magnetic steel, magnetic circuit of the magnetic resistance change, make periodical by coil magnetic flux, thus induced in the coil the electrical pulse signal, the frequency is the frequency of the turning vane. Induction is placed within the turbine cavity magnets, turbine blades by the magnetic materials. Magnets with the turbine rotation, online sha-lu inside the induction electric pulse signal. Because the magnetic resistance type is simple, reliable, so a few more. In addition to the magnetoelectricity conversion mode, can also be used in the form of photoelectric element, hall element, isotope and transformation. In order to improve the anti-interference ability and raised large signal transmission distance, within the magnetoelectric transducer with a preamplifier.

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