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Which is a good small liquid flowmeter?
2. Working principle of turbine flowmeter
The working principle of turbine flowmeter is based on fluid dynamics and electromagnetic induction principles. Flow measurement is achieved by measuring the impeller speed. The specific process is as follows
1. The fluid drives the impeller to rotate. After entering the sensor housing of the turbine flowmeter, the fluid impacts the impeller blades.
. Due to the fixed angle between the blades and the flow direction of the fluid, the impulse of the fluid generates a rotational torque on the blades. The impeller begins to rotate after overcoming the frictional torque and fluid resistance, and when the torque reaches equilibrium, the impeller speed tends to stabilize. Key relationship: Under specific conditions (such as stable fluid viscosity and density), the impeller speed is directly proportional to the fluid flow velocity. Figure: Internal structure of turbine flowmeter, with the impeller located in the center of the fluid channel and the signal detector surrounding it2. Electromagnetic induction generates pulse signals. The impeller blades have magnetic permeability (such as stainless steel or special alloys), and when they rotate, they periodically cut the magnetic field of the signal detector (composed of permanent magnets and coils). According to Faradays law of electromagnetic induction, the cutting of magnetic field lines by blades causes periodic changes in the magnetic flux of the coil, thereby inducing electrical pulse signals at both ends of the coil. Signal characteristics: The pulse frequency is proportional to the impeller speed, and then proportional to the fluid flow velocity. The amplitud
4. The cumulative flow meter displays the instantaneous flow rate Q over time and calculates the cumulative flow rate of the fluid (in m3 or L). Accumulated traffic data can be stored or output for industrial process control or trade settlement. Summary of core principles: Turbine flowmeter achieves flow measurement through the following steps: fluid kinetic energy → impeller mechanical energy: fluid impulse drives impeller rotation, and the speed is related to the flow velocity. Mechanical energy → electrical signal: The rotating impeller cuts magnetic field lines and generates a pulse signal proportional to the rotational speed. Electrical signal → flow value: By using the frequency flow conversion equation, the pulse frequency is converted into instantaneous flow and cumulative flow. Application features and advantages: high precision, good repeatability, fast response speed, suitable for measuring clean liquid
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