Intelligent liquid turbine flowmeter is a new type of intelligent instrument integrating turbine flow sensor and display integration with advanced ultra-low-power single-chip microcomputer technology. It has compact mechanism, intuitive reading, high reliability, and is free from external power supply. , anti-lightning strikes, low cost and other obvious advantages.
1. The body of the intelligent liquid turbine flowmeter
The material of the intelligent liquid turbine flow meter body is generally steel or cast iron, and the two ends are flanged. The small diameter gauge also has a threaded interface.
2. Intelligent liquid turbine flowmeter measurement components
The intelligent liquid turbine flowmeter has precision machined blades that together with a set of reduction gears and bearings form the measurement assembly. The two high-precision stainless steel* self-lubricating bearings that support the turbine ensure a long service life of the assembly. Turbine flowmeters can also be lubricated with an external lubricant pump, but be careful not to overdo it.
3. Counter of intelligent liquid turbine flowmeter
The following information is available on the smart liquid turbine flow meter counter panel:
1) Maximum working temperature and pressure:
2) Metering and minimum and maximum flow levels
3) Product model and number
4) Explosion-proof grades and signs
5) The equivalent of the fluid corresponding to the low frequency or high frequency pulse and the wiring method.
4. Intelligent liquid turbine flowmeter rectifier
The intelligent liquid turbine flowmeter rectifier is used to keep the fluid flowing through the turbine flowmeter in a regular state, thereby eliminating the disturbance and having no adverse effect on the metering. High metering accuracy.
5. Intelligent liquid turbine flowmeter magnetic coupling transmission device
The device separates the counter portion in the atmosphere from the gas being measured and transmits the rotation of the measuring assembly to the counter.
★ The pressure loss is small.
★ It has high anti-electromagnetic interference and anti-vibration ability, and has reliable performance and long working life.
★ Adopt advanced ultra-low power single-chip microcomputer technology, the whole machine has strong functions, low power consumption and superior performance. Intelligent flow display with nonlinear accuracy compensation. The accuracy of the correction formula is better than ±0.02%.
★ The meter factor can be set online by button, and can be displayed on the LCD screen. The LCD screen is intuitive and clear, and the reliability is high.
★ Use EEPROM to protect the accumulated flow and meter factor from power failure. Protection time is greater than 10 years.
Main technical parameters of liquid turbine flowmeter:
★ Flowmeter specifications, basic parameters and performance indicators (see Table 2)
★ Accuracy: 0.5, 1.0;
★ Conditions of use:
1, the ambient temperature is -20 ° C ~ 50 ° C;
3. Temperature of the measured medium: -20 ° C ~ 120 ° C;
4, atmospheric pressure: 86Kpa ~ 106Kpa;
5, explosion-proof grade: ibIIBT4.
★ Signal transmission distance: the distance from the sensor to the display can reach 1000m.
A turbine is placed in the center of the pipe, and the ends are supported by bearings. When the fluid passes through the pipeline, it impacts the turbine flowmeter blades, generating a driving torque to the turbine flowmeter, causing the turbine flowmeter to rotate against the frictional torque and the fluid resistance torque. Within a certain flow range, for a given fluid medium viscosity, the rotational angular velocity of the turbine flow meter is proportional to the fluid flow rate. Thus, the fluid flow rate can be obtained by the rotational angular velocity of the turbine flow meter so that the fluid flow through the conduit can be calculated.
The speed of the turbine flow meter is detected by a sensing coil mounted outside the casing. When the turbine flow meter blade cuts the magnetic lines of force generated by the magnetic steel in the casing, it causes a change in the magnetic flux in the sensing coil. The sensing coil sends the detected magnetic flux cycle change signal to the preamplifier, amplifies and shapes the signal, generates a pulse signal proportional to the flow rate, and sends it to the unit conversion and flow total calculation circuit to obtain and display the cumulative flow value; At the same time, the pulse signal is also sent to the frequency current conversion circuit, and the pulse signal is converted into an analog current amount, thereby indicating the instantaneous flow value.
Smart liquid turbine flow meters are measured using a turbine. It first converts the flow rate to the speed of the turbine and then converts the speed into an electrical signal proportional to the flow. This flow meter is used to detect instantaneous flow and total integrated flow, and its output signal is frequency, which is easy to digitize. The induction coil and the * magnet are fixed together on the housing. When the ferromagnetic turbine blade passes the magnet, the magnetic resistance of the magnetic circuit changes to generate an induced signal. The signal is amplified and shaped by an amplifier and sent to a counter or frequency meter to display the total integrated flow. At the same time, the pulse frequency is frequency-voltage converted to indicate the instantaneous flow rate. The speed of the impeller is proportional to the flow rate, and the number of revolutions of the impeller is proportional to the total amount flowing. The output of the turbine flowmeter is a frequency modulated signal that not only improves the immunity of the detection circuit, but also simplifies the flow detection system. It has a turndown ratio of 10:1 and an accuracy of ±0.2%. Turbine flowmeters with small inertia and small size have a time constant of 0.01 seconds.
Intelligent turbine flow meters are widely used in petroleum, organic liquids, inorganic liquids, liquefied gases, natural gas and cryogenic fluids.