Turbine flowmeter is the main type of velocity flowmeter. It uses a multi-blade rotor (turbine) to sense the average flow rate of the fluid and derive the flow or total amount from it. Generally, it is composed of two parts, a sensor and a display, and it can also be made into an integral type. And positive displacement flow meters and Coriolis mass flow meters are called the three types of flow meters with the best repeatability and accuracy. As turbine flow meters, they are the main type of velocity flow meters. They use multi-blade rotors. (Turbine) An instrument that senses the average flow rate of a fluid and derives the flow rate or total amount from it. Generally, it consists of two parts: sensor and display, and it can also be made into an integral type. And volumetric flow meters and Coriolis mass flow meters are known as the three types of flow meters with the best repeatability and accuracy. As one of the top ten types of flow meters, its products have developed into a multi-variety and multi-series mass production The scale. A flow meter that uses a turbine for measurement. It first converts the flow rate into the rotational speed of the turbine, and then converts the rotational speed into an electrical signal proportional to the flow rate. This kind of flowmeter is used to detect instantaneous flow and total integrated flow, and its output signal is frequency, which is easy to digitize. In the figure, the induction coil and the permanent magnet are fixed on the shell together. When the ferromagnetic turbine blade passes the magnet, the reluctance of the magnetic circuit changes, thereby generating an induction signal. The signal is amplified and shaped by the amplifier, and sent to the counter or frequency meter to display the total accumulated flow. At the same time, the pulse frequency undergoes frequency-voltage conversion to indicate instantaneous flow. The speed of the impeller is proportional to the flow, and the number of revolutions of the impeller is proportional to the total amount of 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 turndown ratio can reach 10:1, and the accuracy is within ±0.2%. The time constant of the turbine flowmeter with small inertia and small size can reach 0.01 second. 1. Advantages: (1) High precision, among all flow meters, it is the most accurate flow meter; (2) Good repeatability; (3) Yuan zero drift, good anti-interference ability; (Using overview: Turbine flowmeter in Some of the following measurement objects are widely used: petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas and cryogenic fluids. In Europe and the United States, turbine flowmeters are natural metering instruments second only to orifice flowmeters, only in the Netherlands. More than 2,600 gas turbine flowmeters of various sizes and pressures ranging from 0.8 to 6.5 MPa have been used in natural gas pipelines. They have become excellent natural gas measuring instruments. Second, characteristics: low pressure loss, impeller with anti-corrosion function; advanced The ultra-low power consumption single-chip microcomputer technology, the whole machine has strong functions, low power consumption and superior performance. Intelligent flow display with nonlinear accuracy compensation function. The accuracy of the correction formula is better than ±0.02%. The meter coefficient can be set online by the button and can be set online. Displayed on the LCD screen, the LCD screen is intuitive and clear, and has strong reliability. EEPROM is used to protect the cumulative flow and meter coefficient from power failure. The protection time is greater than 10 years. The high-performance MCU central processing unit is used to complete data collection and processing. Display output and cumulative flow instantaneous flow Convenient man-machine interface display on the same screen, data transmission in the form of standard 485. Adopting full hard alloy (tungsten carbide) shielded cantilever beam structure bearing, integrating rotating bearing and pressure bearing, greatly improving bearing life, and It can work in a medium with a small amount of sand and dirt. Use 1Cr18Ni9Ti all stainless steel structure, (turbine uses 2Cr13) good anti-corrosion performance. Easy maintenance, self-rectifying structure, small and light, simple structure, can be used in a short time The combination and disassembly, easy internal cleaning. It has strong anti-magnetic interference and vibration ability, reliable performance, long life, low flow rate, wide measurement range, on-site LCD display is clear and intuitive, low power consumption, 3V lithium battery power supply Continuous operation for more than 5 years, corrosion resistance, suitable for acid and alkali solutions
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