（ 涡街流量计 ）
是利用液体振动原理而开发的一种新型流量计，广泛应用在石油、化工、冶金、造纸等行业流体的计量。 XY-LUGB heat conduction oil flowmeter ( vortex flowmeter )
is a new type of flowmeter developed using the principle of liquid vibration. It is widely used in the fluid measurement of petroleum, chemical, metallurgy, papermaking and other industries. The flowmeter has no moving parts, strong reliability, high accuracy, and long life. It can be used to measure the instantaneous flow rate and cumulative flow rate of liquids in a wide range of flow rates. It is not affected by the temperature, pressure, viscosity and composition of the medium, at the same time it is not blocked, stuck, difficult to scale, high temperature, high pressure, safe and explosion-proof, suitable for harsh environments. The flowmeter has integrated display and remote transmission display, and can output pulse signals or current signals and network with the computer.
Main characteristics of thermal oil flowmeter:
1. Simple and solid structure, no moving parts, high reliability and very reliable long-term operation.
2. Simple installation and convenient maintenance.
3． The detection sensor does not directly contact the measured medium, and has stable performance and long life.
4． The output is a pulse signal that is proportional to the flow rate, no zero drift, and high accuracy.
5． Wide measurement range and range ratio up to 1:10.
6. The pressure loss is small, the operating cost is low, and it is more energy-saving.
7. Within a certain Reynolds number range, the output signal frequency is not affected by the fluid physical properties and composition changes. 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. Calibration instrument factor.
8. Wide range of applications, steam (saturated steam), gas (air, oxygen, nitrogen, coal gas, natural gas, gas, hydrogen, liquefied petroleum gas, hydrogen peroxide, flue gas, methane, butane, chlorine, gas, biogas , Carbon dioxide, nitrogen, acetylene, phosgene, oxygen, compressed air, argon, toluene, benzene, xylene, hydrogen sulfide, sulfur dioxide, ammonia), steam, liquid and water, etc.), liquid (water, high temperature water, oil , Food liquid, chemical liquid, etc.), liquid, gas flow can be measured.
Working principle of heat transfer oil flow meter:
是以卡门（Kaman）和斯特劳哈（Strouhsl）有关旋涡的产生和旋涡与流速关系的理论来测量流量的。 Vortex flowmeters use
Kaman and Strouhsl's theory of vortex generation and the relationship between vortex and flow velocity to measure flow. When the medium flows through the triangular cylinder at a certain speed, an alternating array of vortex bands is generated behind the sides of the triangular cylinder, which is called "Carmen vortex street" (see the figure below).
Because the vortex generator alternately generates vortices on both sides, pressure pulsations are generated on both sides of the vortex generator, so that the test body generates alternating pressure. The piezoelectric crystal element encapsulated in the probe body generates the same effect as the vortex under the action of alternating stress The alternating charge signal of frequency. The amplifier amplifies, filters, shapes the charge signal, and then outputs a pulse signal (or converted into a 4-20mA signal) whose frequency is proportional to the flow rate of the medium, and sends it to the totalizer for processing and 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 surface of the vortex generator is f = St · v / d, where St Strouha number, which is a dimensionless coefficient. As long as the frequency f is accurately measured, the fluid flow velocity v can be obtained, and the volume flow rate can be obtained from v.
Technical index of heat transfer oil flowmeter:
1. Measurement medium: liquid, gas, saturated steam, superheated steam.
2. Accuracy grade: liquid ± 1.0%, gas (steam) ± 1.5%, plug-in ± 2.5%.
3． Working pressure: 1.6MPa, 2.5MPa, 4.0MPa, 6.4MPa.
4． Medium temperature: ordinary type -40 ～ 150 ℃ medium temperature type -40 ～ 250 ℃ high temperature type -40 ～ 350 ℃.
5． Output signal: three-wire voltage pulse, low-level 0 ～ 1V, high-level> 4V, 50% duty cycle; two-wire standard current 4 ～ 20mA; three-wire standard current 0 ～ 10mA.
6. Working environment: -35 ℃ ～ + 60 ℃, humidity ≤95% RH.
7. Working power: DC12V; DC24V.
8. Housing material: carbon steel, stainless steel.
9. Explosion-proof type: ExibIICT6.