Turbine flow meter working principle

 

The working principle of turbine flow meter is mainly based on the principle of conservation of momentum in fluid dynamics. The flow rate of fluid is determined by measuring the speed at which the fluid drives the turbine blades to rotate. The following is a detailed explanation of the working principle of turbine flow meter:

 

I. Basic structure

 

The turbine flow meter is mainly composed of a housing, a guide, a support, a turbine and a magnetoelectric converter (or a photoelectric sensor). The turbine, as a measuring element, is made of stainless steel with good magnetic conductivity, on which spiral blades are mounted and supported on bearings with very little friction. The magnetoelectric converter consists of a coil and a magnetic steel, which is installed on the housing of the flow meter to convert the rotation speed of the turbine into an electrical signal.

 

II. Working principle

 

Fluid drives the turbine to rotate:

When the measured fluid passes through the pipeline of the turbine flow meter, it impacts the turbine blades and generates a driving torque on the turbine.

In a certain flow range, for a certain fluid medium viscosity and pressure conditions, the rotational angular velocity of the turbine is proportional to the average flow velocity of the fluid.

Magnetoelectric conversion:

The rotation speed of the turbine is converted into an electrical signal by a magnetoelectric converter. Specifically, when the turbine blades rotate and pass under the magnetic steel, the magnetic resistance in the magnetic circuit will change, causing the magnetic flux passing through the coil to change periodically.

According to the principle of electromagnetic induction, this change in magnetic flux will induce an electrical pulse signal in the coil. The frequency of the electrical pulse signal is proportional to the rotation speed of the turbine, that is, proportional to the flow rate of the fluid.

Signal processing and display:

The induced electrical pulse signal is amplified and shaped by the preamplifier to produce a rectangular electrical pulse signal with a regular amplitude and waveform.

These pulse signals are then sent to the unit conversion and flow accumulation circuit, and the cumulative flow value is calculated and displayed. At the same time, the pulse signal can also be sent to the frequency current conversion circuit and converted into an analog current (such as a 4-20mA signal) to indicate the instantaneous flow value.

 

III. Technical features

High measurement accuracy: The turbine flowmeter has high precision, and its measurement error is usually small, which can meet the needs of various industrial occasions.

Good repeatability and stability: When the turbine flowmeter measures the same flow multiple times, the results have good repeatability and good stability for long-term use.

Wide range: The range ratio of the turbine flowmeter can reach 10:1 or higher, and it can measure flow rates in different ranges.

Quick response: The turbine flowmeter responds quickly to flow changes and can reflect flow changes in real time.

Strong anti-interference ability: The output signal of the turbine flowmeter is a frequency modulated signal with strong anti-interference and easy signal transmission.

IV. Application fields

Turbine flowmeters are widely used in petroleum, chemical, electric power, gas pipelines, urban gas and other fields, and are used for trade settlement. In addition, they are also widely used in special fields such as scientific research experiments, national defense science and technology, and metrology departments.

 

V. Precautions

Turbine flowmeters have high requirements for the cleanliness of the measuring medium. If the medium contains impurities or particulate matter, it may affect the measurement accuracy and the service life of the turbine.

The service life of the turbine flowmeter may be subject to certain restrictions, and regular maintenance and calibration are required to ensure measurement accuracy.

 

When installing and using the turbine flowmeter, it is necessary to follow the relevant operating procedures and precautions to ensure its normal operation and the accuracy of the measurement results.

In summary, the turbine flowmeter determines the flow rate of the fluid by measuring the speed at which the fluid drives the turbine blades to rotate. It has the advantages of high precision, good repeatability and stability, wide measuring range, rapid response and strong anti-interference ability.

 

If you want to know the specific selection and quotation of the turbine flow meter, please consult CIXIFM winny:
Email: sales01@cxflowmeter.com

whatsapp: 008618049841995