Function principle of liquid turbine flowmeter
The turbine flowmeter output signal is pulse, easy to digitize. The turbine flowmeter has little pressure loss, and the blade can resist corrosion. It can measure thick and corrosive medium.Create a life and a pulse signal is inversely proportional to the velocity, when the fluid through the pipeline, the turbine meter for the torsion angle velocity and the fluid velocity is inversely proportional to the placing of a turbine, which will result in the pipe center, the changes in the magnetic flux sensor coil. Flux cycle sensor coil will detect the changing signal into the preamplifier, and pulse signal into the frequency current conversion circuit, signal amplification, shaping of the development of the turbine meter for suppression of friction torque and resistance torque of liquid and the occurrence of tampering. The turbine flowmeter attack drive torque, blade liquid turbine flowmeter, turbine flowmeter when cutting the leaves from the shell permanent magnet breaks out when the magnetic flux through the turbine flowmeter fluid velocity can be altered angular velocity lose, transforms the signal impulse current simulation, fluid viscosity on the turbine for certain. Meter speed after sensing coil is arranged in the shell to detect. The two ends are supported by bearings. Thus I argue against the lost through fluid flow process pipeline. In the field of not necessarily traffic, and then write the instantaneous flow value. The feed unit converter acquires and discloses the embodied stack flow value with the flow integrator circuit.
Liquid turbine flowmeter is widely used in petroleum, organic liquid, inorganic liquid, liquefied gas, natural gas and low temperature fluid.
Liquid turbine flowmeters are measured using a turbine. It converts the flow velocity to the speed of the turbine, then converts the speed into electrical signals proportional to the flow rate. The flowmeter is used to detect instantaneous flow and total accumulated flow, whose output signal is frequency and easy to digitize. The induction coil and the permanent magnet are fixed together on the housing. When the ferromagnetic turbine blade passes through the magnet, the magnetic resistance of the magnetic circuit changes, thereby generating an induced signal. The signal is amplified and shaped by an amplifier and sent to a counter or frequency meter to indicate the total amount of accumulated flow. At the same time, the pulse frequency is converted through frequency voltage to indicate instantaneous flow. The speed of the impeller is proportional to the flow rate, and the speed of the impeller is proportional to the total flow. The output of the turbine flowmeter is a frequency modulated signal, which not only improves the anti-interference performance of the detection circuit, but also simplifies the flow detection system. Its range ratio of up to 10:1, accuracy is less than 0.2%. The time constant of a turbine flowmeter of small inertia and small dimensions can be up to 0.01 seconds.
