Turbine flowmeter

I. Overview:

       The aics-21 series intelligent vortex flowmeter is a new type of flowmeter developed by using the principle of liquid vibration. It is widely used in the measurement of fluids in petroleum, chemical, metallurgy, papermaking and other industries. The flowmeter has no moving parts and is reliable. Strong, high precision, long life, can accurately measure the instantaneous flow and accumulated flow of liquid in a wide flow range. It is not affected by the temperature, pressure, viscosity and components of the medium, at the same time it is not blocked, not stuck, not easy to scale, resistant to high temperature, high pressure, safe and explosion-proof, and suitable for harsh environments. The flowmeter is divided into integrated display and remote transmission display, and can output pulse signal or current signal to network with microcomputer.

       2. Main features:

       1. The vortex flowmeter has a simple and firm structure, no moving parts, high reliability, and very reliable long-term operation.

       2. The vortex flowmeter is easy to install and easy to maintain.

       3. The vortex flowmeter detection sensor does not directly contact the measured medium, with stable performance and long life.

       4. The output of the vortex flowmeter is a pulse signal proportional to the flow rate, with no zero drift and high accuracy.

       5. The vortex flowmeter has a wide measuring range, and the range ratio can reach 1:10.

       6. The vortex flowmeter has less pressure loss, low operating cost and more energy-saving significance.

       7. In a certain range of Reynolds number, the output signal frequency of the vortex flowmeter is not affected by the physical properties and composition changes of the fluid. The meter coefficient is only related to the shape and size of the vortex generator. There is no need to compensate when measuring the volume flow of the fluid. Replacement of accessories Generally, there is no need to re-calibrate the meter coefficients.

       8. The vortex flowmeter has a wide range of applications, and the flow of steam, liquid and gas can be measured.

       3. Working principle:

       The vortex flow sensor measures the flow based on the theory of Kaman and Strouhsl about the generation of vortices and the relationship between vortices and flow velocity. When the medium flows through the triangular cylinder at a certain speed, an alternately arranged vortex belt is generated behind the two sides of the triangular cylinder, which is called "Kamen Vortex Street" (see the figure below).

       Because vortices are alternately generated on both sides of the vortex generator, pressure pulsations are generated on both sides of the generator, so that the test body generates alternating pressure. The piezoelectric crystal element encapsulated in the probe body produces the same vortex under the action of alternating stress. Frequency alternating charge signal, the amplifier will amplify, filter, shape the charge signal, output a pulse signal whose frequency is proportional to the medium flow rate (or convert it into a 4-20mA signal), and send it to the totalizer for processing, display and control.

       Within a certain Reynolds number range (2×104～7×106 ), the relationship between the release frequency f of the vortex and the fluid velocity V and the width d of the front face of the vortex generator is f=St·v/d, where St It is the Strouha number, which is a dimensionless coefficient. As long as the frequency f is accurately measured, the fluid velocity v can be obtained, and the volume flow rate can be obtained from v.

       4. Technical indicators:

       1. Vortex flowmeter measures medium: liquid, gas, saturated steam, superheated steam.

       2. Accuracy grade of vortex flowmeter: liquid ±1.0%, gas (steam) ±1.5%, plug-in type ±2.5%.

       3. Vortex flowmeter working pressure: 1.6MPa, 2.5MPa, 4.0MPa, 6.4MPa.

       4. Medium temperature of vortex flowmeter: common type -40～150℃, medium temperature type -40～250℃, high temperature type -40～350℃.

       5. Vortex flowmeter output signal: three-wire voltage pulse, low level 0～1V, high level> 4V, duty cycle 50%; two-wire standard current 4～20mA; three-wire standard current 0～10mA.

       6. Vortex flowmeter working environment: -35℃～+60℃, humidity ≤95%RH.

       7. Vortex flowmeter working power supply: DC12V; DC24V.

       8. Vortex flowmeter housing material: carbon steel, stainless steel.

       9. Vortex flowmeter explosion-proof type: intrinsically safe ExibIICT6.

       5. Dimensions of vortex flowmeter:

       DN A B C D

       15 90 Φ57 383 45

       20 100 Φ57 388 50

       25 100 Φ57 394 50

       32 100 Φ65 396 50

       40 100 Φ75 401 50

       50 110 Φ87 407 55

       65 110 Φ109 418 55

       80 110 Φ120 423 55

       100 120 Φ149 447 60

       125 125 Φ175 474 65

       150 145 Φ203 501 75

       200 170 Φ259 556 100

       250 190 Φ312 608 120

       300 210 Φ363 660 140

       350 230 Φ409 709 160

       400 250 Φ460 756 180

       450 275 Φ520 814 205

       500 290 Φ575 869 225

       Flow measurement range of vortex flowmeter

       Caliber DNmm Gas measuring range m3/h Liquid measuring range m3/h

       15 0-30 0-8

       25 8-60 1-12

       32 12-100 1.5-20

       40 18-180 2.5-30

       50 30-300 3-50

       65 50-500 6-80

       80 70-700 10-125

       100 100-1000 15-200

       125 150-1500 25-310

       150 200-2000 40-445

       200 400-4000 90-900

       250 600-6000 150-1500

       300 1000-10000 200-2000

       Six, plug-in vortex flowmeter

       Insert the vortex street measuring head into a specific position of the pipeline, and calculate the average flow velocity in the pipeline by measuring the local flow at that position and according to the flow velocity distribution relationship of the pipe section. It consists of converter, insert rod assembly, ball valve (according to requirements), installation short pipe (ф100

       7. Main technical parameters Intelligent turbine flowmeter 1. Nominal diameter: 4mm ~ 200mm, intelligent turbine flowmeter 2. Accuracy: ±0.2%R, ±0.5%R, ±1.0%R; ±0.2%FS(4~ 20mA), intelligent turbine flowmeter 3. Measured medium: liquid that does not damage 1Cr18Ni9Ti and cemented carbide, intelligent turbine flowmeter 4. Ambient temperature: -20℃ ~ +50℃, intelligent turbine flowmeter 5. Medium temperature: -20℃ ~ +120℃, intelligent turbine flowmeter 6. Nominal pressure: 1.6 Mpa, 2.5Mpa, 6.3Mpa, 25Mpa, intelligent turbine flowmeter 7. Explosion-proof grade: ExibⅡBT4, ExdⅡBT6, intelligent turbine flowmeter 8. Output signal: Voltage pulse, 4 ~ 20 mA (+24V DC) two-wire system, intelligent turbine flowmeter 9. Communication interface: RS-485 communication interface is selected. Intelligent turbine flowmeter 10. Power supply: Sensor: +5V~ +24VDC (external) Transmitter: +24VDC (external) Flowmeter: 3.0V lithium battery (internal)

       8. Features

       Intelligent turbine flowmeter 1. The lower limit of the flow rate is low, and the range is wide;

       Intelligent turbine flowmeter 2. Adopting hard alloy bearing, reliable performance and long life;

       Intelligent turbine flowmeter 3. It has strong anti-vibration and anti-electromagnetic interference capabilities;

       Intelligent Turbine Flowmeter 4. On-site LCD screen display is clear and intuitive, low power consumption, 3.0V lithium battery power supply can run continuously for more than 5 years.