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Working principle and composition of turbine flowmeter
Working principle of turbine flowmeter: fluid flows through the sensor housing
Product details
Working principle of turbine flowmeter The fluid flows through the sensor housing. Due to the angle between the blades of the impeller and the flow direction, the impulse of the fluid causes the blades to have a rotational torque. After overcoming the friction torque and fluid resistance, the blades rotate. After the torque is balanced, the speed stabilizes. Under certain conditions, the speed is proportional to the flow velocity. Due to the magnetic conductivity of the blades, they are in the magnetic field of the signal detector (composed of permanent magnet and coil). The rotating blades cut the magnetic field lines, periodically changing the magnetic flux of the coil, thereby inducing electricity at both ends of the coil
Pulse signal, which is amplified and shaped by an amplifier to form a continuous rectangular pulse wave with a certain amplitude, can be transmitted remotely to a display instrument to display the instantaneous flow rate and cumulative quantity of the fluid. Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow rate Q of the fluid flowing through the sensor, and the flow equation is Q=3600 × f/k
Turbine flowmeter belongs to velocity flowmeter, also known as impeller flowmeter. The impeller flowmeter utilizes the proportional relationship between the rotational angular velocity of the impeller placed in the fluid and the fluid flow velocity, and reflects the volume flow rate of the fluid passing through the pipeline by measuring the rotational speed of the impeller. It is one of the more mature high-precision instruments in flow meters. A turbine flowmeter generally consists of the following typical five parts:
consist of
1. Table body
1. Table body
The material of the watch body is generally steel or cast iron, with flange connections at both ends. Small caliber watches also use threaded interfaces.
2. Components measured
There are precision machined blades on the turbine, which together with a set of reduction gears and bearings form a measuring component. The two high-precision stainless steel permanent self-lubricating bearings supporting the turbine ensure that the component has a long service life. The turbine flowmeter can also use an external lubricating oil pump to lubricate the bearings, but be careful not to over lubricate them.
3. Counter
The counter panel contains the following important information:
(1) Maximum operating temperature and pressure:
(2) Measurement and Minimum and Maximum Flow Levels
(3) Product model and number
(4) Explosion proof grade and marking
(5) The equivalent and wiring method of the fluid corresponding to low-frequency or high-frequency pulses.
4. Rectifiers
The rectifier is used to keep the fluid flowing through the turbine flowmeter in a regular state, thereby eliminating the adverse effects of disturbances on the metering. High measurement accuracy.
5. Magnetic coupling transmission device
The device separates the counter part in the atmospheric environment from the measured gas and transmits the rotation of the measuring component to the counter.
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