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Vortex flowmeter

 

JGLUϵÁÐVortex flowmeter
Vortex street flowmeter application
The SKLU series vortex street flowmeter mainly uses in the industry pipeline medium fluid the flow measurement, like gas, liquid, vapor and so on many kinds of medium. Its characteristic is the pressure loss is small, the measuring range scope is big, the precision is high, when survey operating mode rate of volume flow nearly not parameter and so on fluid density, pressure, temperature, viscosity influences. Not movable machine parts, therefore the reliability is high, maintains the quantity to be small. The measuring appliance parameter can the long-term stability. The vortex street flowmeter uses the piezoelectricity stress type sensor, the reliability is high, may in - 20¡æ~+250¡æ the operating temperature scope works. Has the mock standard signal, also has the digital pulse signal output, easy and number system necessary uses and so on computer, is one kind quite advanced, the ideal flow instrument.
Vortex street flowmeter principle
Establishes the triangle columnar order whirlpool in the fluid to have the body, has the body both sides from the whirlpool to produce alternately has the rule whirlpool, this kind of whirlpool is called the Carmen whirlpool, if the figure to the right shows, turns on lathe the vortex street to have the body downstream in the whirlpool to arrange asymmetrically.
Supposes the whirlpool the occurrence frequency is f, was measured that the medium mean velocity of stream is, the whirlpool has the body to welcome the flow surface width is d, shows the body latus rectum is D, then obtains the following relationship:
¡¡f=SrU1/d=SrU/md ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡(1)
In the formula U1--The whirlpool has the body both sides mean velocity of stream, m/s;
¡¡¡¡¡¡¡¡ Sr--Strouhal number;
¡¡¡¡¡¡¡¡ m--Of the whirlpool has ratio of the body both sides arch area and the pipeline cross-section area
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡
¡¡In the pipeline rate of volume flow qv is
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ qv=¦ÐD2U/4=¦ÐD2mdf/4Sr ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡(2)
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ K=f/qv= [¦ÐD2md/4Sr] - 1 ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ (3)
In the formula K--Flowmeter's scaling factor, the pulse counts /m3 (P/m3).
¡¡¡¡ K besides has the body, pipeline's geometry size with the whirlpool related, but also concerns with the Strouhal number. The Strouhal number is the zero dimension parameter, it has the build shape and the Reynolds number with the whirlpool related, shown in Figure 2 for the circle columnar whirlpool has body's Strouhal number and the pipeline Reynolds number relational graph. The figure shows, in ReD=2¡Á104~7¡Á106 the scope, Sr may regard as the constant, this is the measuring appliance normal work scope. When survey gas flow amount, the VSF current capacity formula is

¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ (4)

Figure 2 Strouhal number and Reynolds number relations curve
In the formula qVn, qV--Respectively is under the standard state (0oC or 20oC,101.325kPa) and under the operating mode rate of volume flow, m3/h;
¡¡¡¡ Pn, P--Respectively is under the standard state and the operating mode absolute pressure, Pa;
¡¡¡¡ Tn, T--Respectively is under the standard state and the operating mode thermodynamic temperature, K;
¡¡¡¡ Zn, Z--Respectively be under standard state under and operating mode gas loading coefficient.
¡¡¡¡ Is obvious by the above equation, the VSF output's pulse frequency signal not the fluid nature and the component change's influence, namely the scaling factor only has in certain Reynolds number scope with the whirlpool the body and pipeline's shape size and so on concerns. But must examine the mass flow as the flowmeter in the mass balance and in the energy measurement, by now flowmeter's output signal should simultaneously monitor the rate of volume flow and the fluid density, the fluid nature and the component has the immediate influence to the flow measurement.
¡¡¡¡The vortex street flowmeter is carries on the solid surrounding boundary rate of fluid flow survey based on the Carmen whirlpool principle the new flowmeter. Because it has the good medium adaptiveness, does not need the temperature pressure compensation then direct measurement steam, the air, the gas, the water, the liquid operating mode rate of volume flow, provides the temperature, the pressure transmitter to be possible the surveyor's beacon situation rate of volume flow and the mass flow, is the throttle type flowmeter's ideal substitution product.
¡¡¡¡ In order to enhance the vortex street flowmeter thermostable and the vibration-proof mobility energy, Our company recently developed the SDLU advanced version vortex street flow sensor, because its unique structure and the selection cause this sensor to be possible in the high temperature (350¡æ), the strong vibration (¡Ü1g) under the bad operating mode uses.
¡¡¡¡ In the practical application, often the maximum current capacity far is lower than measuring appliance's on limiting value, along with the load change, the minimum current capacity often will be lower than measuring appliance's lower limiting value, the measuring appliance works by no means in its best work section, to solve this problem, usually will use in the survey place reducing enhancement survey place speed of flow, and will select compares small caliber the measuring appliance to favor measuring appliance's survey, but this kind will change the diameter way must has the length between the reducing pipe and the measuring appliance be above the 15D straight length of pipe carries on the rectification, will cause the processing, the installment not to be convenient. Our company develops the longitudinal section shape changes the diameter rectifier for circular arc LGZ, has the rectification, to enhance the speed of flow and the change speed of flow distribution multiple actions, its structure size is small, is only the craft bore of pipe 1/3, makes a body with the vortex street flowmeter, not only does not need seperately to attach section of straight lengths of pipe, but may also reduce to the craft tube straight length of pipe request, the installment is convenient.
For the easy to operate, battery power supply's this locality demonstrated that the vortex street flowmeter uses the micro power loss high technology and new technology, uses the lithium battery power supply to be possible to move uninterruptedly above for one year, has saved the electric cable and display instrument's purchase fabricating cost, may demonstrate the transient flow, the integrated flux and so on. A temperature compensation build vortex street flowmeter also has the temperature sensor, may the direct measurement saturated steam temperature and calculates the pressure, thus demonstrates the saturated steam the mass flow. Thermobaric compensates a build to have the temperature, the pressure transmitter, uses in the gas flow amount survey being possible the direct measurement gas medium temperature and the pressure, thus demonstration gas sign situation rate of volume flow.
¡ô survey medium: Gas, liquid, vapor
¡ô the caliber specification flange card installs the type caliber to choose 25,32,50,80,100
¡ô the flange connection type caliber chooses 100,150,200
¡ô flow measurement scope normal survey speed of flow scope Reynolds number 1.5¡Á104~4¡Á106; Gas 5~50m/s; Liquid 0.5~7m/s
The normal survey current capacity scope liquid, the gas flow amount measuring range see Table 2; The steam flow scope see Table 3
¡ô measuring accuracy 1.0 levels of 1.5 levels
¡ô is measured the medium temperature: Normal temperature - 25¡æ~100¡æ
¡ô high temperature - 25¡æ~150¡æ -25¡æ~250¡æ
¡ô output signal pulse voltage output signal high level 8~10V low level 0.7~1.3V
¡ô the pulse dutyfactor approximately 50%, the transmitting range is 100m
¡ô pulse current far signalling number 4~20 mA, the transmitting range is 1000m
¡ô measuring appliance use ambient temperature: - 25¡æ~+55¡æ humidity: 5~90% RH50¡æ
¡ô material quality stainless steel, aluminum alloy
¡ô power source DC24V or lithium battery 3.6V
¡ô explosion-proof rank this peaceful iaIIbT3-T6
Protection rank IP65
Vortex street flowmeter product shaping
Code number
Latus rectum
Current capacity scope ©O/h
SKLU-25
DN25
1~10 (liquid)
25~60 (gas)
The steam current capacity please examine the instruction booklet, the DN300 above recommends the use jack-in type vortex street flowmeter
SKLU-32
DN32
1.5~18 (liquid)
15~150 (gas)
SKLU-40
DN40
2.2~27 (liquid)
22.6~150 (gas)
SKLU-50
DN50
4~55 (liquid)
35~350 (gas)
SKLU-80
DN80
9~135 (liquid)
90~900 (gas)
SKLU-100
DN100
14~200 (liquid)
140~1400 (gas)
SKLU-150
DN150
32~480 (liquid)
300~3000 (gas)
SKLU-200
DN200
56~800 (liquid)
550~5500 (gas)
Code number
Function 1
N
Not thermobaric compensates
Y
Has the thermobaric compensation
Code number
Output model
F1
4-20mA output (two-wire system)
F2
4-20mA output (three-wire system)
F3
RS485 communication connection
Code number
Is measured the medium
J1
Liquid
J2
Gas
J3
Steam
Code number
Connection mode
L1
The flange card installs the type
L2
Flange connection type
Code number
Function 2
E1
1.0 levels
E2
1.5 levels
T1
Normal temperature
T2
High temperature
T3
Steam
P1
1.6MPa
P2
2.5MPa
P3
4.0MPa
D1
Internal 3.6V power supply
D2
DC24V power supply
B1
Stainless steel
B2
Carbon steel
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