How Turbine Flow Meters Work

Abstract: Information on the working principle of turbine flowmeters is provided by excellent flowmeter and flowmeter manufacturers. 1. The working principle of the turbine flowmeter The schematic diagram of the turbine flowmeter is shown in Figure 31. A turbine is placed in the middle of the pipe, and both ends are supported by bearings. When the fluid passes through the pipe, it hits the turbine blades and generates a driving torque on the turbine, causing the turbine to fight. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the working principle of turbine flowmeters. 1. The working principle of the turbine flowmeter The schematic diagram of the turbine flowmeter is shown in Figure 3—1 shown. A turbine is placed in the middle of the pipe, and both ends are supported by bearings. When the fluid passes through the pipeline, it impacts the turbine blades and generates a driving torque to the turbine, so that the turbine rotates by overcoming the conflict torque and the fluid resistance torque. In a certain flow range, for a certain fluid medium viscosity, the rotational angular velocity of the turbine is proportional to the fluid velocity. Thus, the fluid velocity can be obtained through the rotational angular velocity of the turbine, and then the fluid flow through the pipeline can be calculated. The rotational speed of the turbine is detected by a sensor coil installed outside the casing. When the turbine blade cuts through the magnetic field lines generated by the permanent magnets in the casing, it causes the magnetic flux in the sensing coil to change. The sensing coil sends the detected magnetic flux cycle change signal to the pre-expander, expands and shapes the signal, generates a pulse signal proportional to the flow rate, and sends it to the unit conversion and flow accumulation 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 imitation current, thereby indicating the instantaneous flow value. The overall principle frame of the turbine flowmeter is shown in Figure 3—2 shown. 2. The construction fluid of the turbine flowmeter flows in from the inlet of the casing. A pair of sleeve bearings are fixed on the central axis of the tube through the bracket, and the turbine is installed on the bearing. Radial-shaped fairings are installed on the brackets upstream and downstream of the turbine to guide the fluid to prevent the fluid from spinning and changing the angle of effect on the turbine blades. A sensing coil is installed outside the casing above the turbine to receive the magnetic flux change signal. The main components are described below. (1) Turbine The turbine is made of magnetically conductive stainless steel and is equipped with helical blades. The number of blades varies according to the diameter, ranging from 2 to 24. In order to make the turbine have an excellent response to the flow rate, the required mass is as small as possible. The usual requirements for turbine blade construction parameters are: blade pitch 10°-15°(gas), 30°-45°(liquid); blade stacking degree P is 1—1.2; the gap between the blade and the inner shell is 0.5—1mm. (2) The bearing of the bearing turbine is usually made of a sliding-cooperative carbide bearing, which requires good wear resistance. When the fluid passes through the turbine, an axial thrust will be generated on the turbine, which will increase the conflict torque of the uranium bearing and accelerate the wear of the uranium bearing. In order to eliminate the axial force, it is necessary to adopt a hydraulic balance method in the structure. The principle of this method is shown in the figure. 3—3 shown. Because the diameter DH at the turbine is slightly smaller than the diameter Ds at the front and rear brackets, the flow intercepts and expands in the turbine section, the flow rate decreases, and the hydrostatic pressure rises P. The static pressure of P will offset some axial thrust. Figure 3-3 Schematic diagram of the principle of hydraulic balance (3) Pre-expander The pre-expander consists of a magneto-electric induction converter and an expansion shaping circuit. The schematic diagram is shown in Figure 3.—4 shown. Magnetoelectric converters are usually made of magnetoresistive type in China, which is composed of permanent magnet steel and externally wound induction coils. When the fluid passes through the rotating iron wheel, the magnetic resistance is the smallest when the blades are directly under the permanent magnet, and the magnetic resistance is the largest when the gap between the two blades is below the magnetic steel. The induced potential is sent to the expansion shaping circuit to become a pulse signal. The frequency of the output pulse is proportional to the flow through the flowmeter, and its share coefficient K is K=? (3-1) where f——the output pulse frequency of the turbine flowmeter; qv——Flow through the flow meter. This share factor is also known as the meter factor of the turbine flowmeter. Figure 3-4 Schematic diagram of turbine flowmeter pre-expander (4) Signal reception and display Signal reception and display are composed of coefficient corrector, adder and frequency-to-electrical converter. The incoming pulse signal is transformed into cumulative flow and instantaneous flow and displayed. ? The above is the entire content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'The working principle of the turbine flow meter'

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