Gas vortex flowmeter is mainly used to measure the volumetric flow rate of gases, vapors, or liquids in various pipelines. Its working principle is to set up non streamlined vortex generators (such as triangular columns) in the fluid, and alternately generate regular vortices on both sides of the vortex generators, which are called Karman vortices. The frequency of vortices is directly proportional to the flow velocity of the fluid. By measuring the frequency of vortices, the flow velocity of the fluid can be calculated, and then the flow rate can be determined. It is widely used in various fields such as industrial production, energy measurement, environmental protection, and transportation.
Manufacturer of intelligent gas vortex flowmeter
Its characteristics are small pressure loss, large range, high accuracy, and almost unaffected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring volumetric flow rate under working conditions. No movable mechanical parts, therefore high reliability and low maintenance. The instrument parameters can remain stable for a long time. The vortex flowmeter adopts a piezoelectric stress sensor with high reliability and can operate within a temperature range of -20 ℃ to+250 ℃. There are both analog standard signals and digital pulse signal outputs, which are easy to use in conjunction with digital systems such as computers and are relatively advanced and ideal.
Working principle of gas vortex flowmeter
When a triangular column type vortex generator is set up in the fluid, regular vortices are produced alternately from both sides of the vortex generator. The vortices are called Karman vortices, and the vortices are arranged asymmetrically in the downstream of the vortex generator.
Parameters and requirements
Measuring medium: gas, liquid, vapor
Connection mode: flange clamping type, flange type, insert type
Caliber specifications Flange clamping calibers selected 25,32,50,80,100
Flange connection calibers selected 100,150,200
Flow measurement range Normal flow rate range Reynolds number 1.5×104 ~ 4×106; Gas 5 ~ 50m/s; Liquid 0.5 ~ 7m/s
The normal measurement flow range of liquid and gas flow is shown in Table 2. The steam flow range is shown in Table 3
Measurement accuracy level 1.0 and level 1.5
The measured medium temperature: normal temperature -25 ℃ ~ 100℃
High temperature -25℃ ~ 150℃ -25℃ ~ 250℃
Output signal Pulse voltage Output signal high level 8 ~ 10V Low level 0.7 ~ 1.3V
The pulse duty cycle is about 50%, and the transmission distance is 100m
Pulse current remote transmission signal 4 ~ 20 mA, the transmission distance is 1000m
Instrument operating environment temperature :-25℃ ~ +55℃ Humidity :5 ~ 90% RH50℃
Material Stainless steel, aluminum alloy
Power supply DC24V or lithium battery 3.6V
Explosion-proof class Intrinsic safety type iaIIbT3-T6
The IP65 vortex flowmeter is a volume flowmeter that measures the volume flow rate of gas, steam or liquid, the volume flow rate of the standard condition or the mass flow rate according to the Karman vortex principle. It can be used as a flow transmitter in automatic control system.
The instrument adopts advanced differential technology, combined with isolation, shielding, filtering and other measures to overcome the similar products poor shock resistance, small signal data disorder and other problems, and adopts unique sensor packaging technology and protective measures to ensure the reliability of the product. There are two types of products: basic type and compound type, the basic type measures a single flow signal; The composite can measure temperature, pressure and flow at the same time. Each type has an integral and separate structure to adapt to different installation environments.
Saturated steam flow measurement in the 1980s, people generally used standard orifice flowmeter, but from the development of flow meters, orifice flowmeter despite its long history, a wide range of applications; The research on it is also the most adequate, the test data is the most perfect, but the standard orifice flowmeter to measure the saturated steam flow, it still has some shortcomings: first, the pressure loss is large; Second, the pressure guide pipe, the three groups and the connection joint are easy to leak; Third, the range is small, generally 3 to 1, which is easy to cause low measurement value due to large flow fluctuation. The vortex flowmeter has a simple structure, and the vortex transmitter is directly installed on the pipeline, which overcomes the leakage phenomenon of the pipeline. In addition, the vortex flowmeter has a small pressure loss, a wide range, and a range ratio of 30 to 1 for saturated steam measurement. Therefore, with the maturity of vortex flowmeter measurement technology, the use of vortex flowmeter is more and more favored by people.
Application of gas vortex flowmeter
The gas vortex flowmeter is a new type of flowmeter that measures fluid flow in closed pipelines based on the Karman vortex principle. Due to its excellent medium adaptability, it can directly measure the volumetric flow rate of steam, air, gas, water, and liquid without temperature and pressure compensation. Equipped with temperature and pressure sensors, it can measure standard volumetric flow rate and mass flow rate, making it an ideal alternative to throttling flow meters.
To improve the high temperature resistance and vibration resistance of gas vortex flow meters, our company has recently developed the SKLUG improved vortex flow sensor. Due to its unique structure and material selection, the sensor can be used in harsh working conditions such as high temperature (350 ℃) and strong vibration (≤ 1g).
In practical applications, the maximum flow rate is often much lower than the upper limit of the instrument, and with changes in load, the minimum flow rate is often lower than the lower limit of the instrument. The instrument is not working in its optimal working range. To solve this problem, it is usually necessary to reduce the diameter at the measuring point to increase the flow rate at the measuring point, and use smaller diameter instruments to facilitate the measurement of the instrument. However, this variable diameter method requires a straight pipe section with a length of more than 15D between the variable diameter pipe and the instrument for rectification, which makes processing and installation inconvenient. Our company has developed an LGZ variable diameter rectifier with a curved longitudinal section, which has multiple functions such as rectification, increasing flow velocity, and changing flow velocity distribution. Its structural size is small, only one-third of the inner diameter of the process pipe, and it is integrated with the vortex flowmeter. It not only does not require an additional straight pipe section, but also reduces the requirements for the straight pipe section of the process pipe, making installation very convenient.
For the convenience of use, the battery powered on-site display gas vortex flowmeter adopts low-power high-tech. It can operate continuously for more than a year using lithium battery power supply, saving the procurement and installation costs of cables and display instruments. It can display instantaneous flow, cumulative flow, etc. on-site. The temperature compensated integrated vortex flowmeter also comes with a temperature sensor, which can directly measure the temperature of saturated steam and calculate the pressure, thereby displaying the mass flow rate of saturated steam. The temperature pressure compensation integrated type is equipped with temperature and pressure sensors, which can directly measure the temperature and pressure of the gas medium for gas flow measurement, thereby displaying the standard volume flow rate of the gas.
Application of gas vortex flowmeter
This instrument can be widely used for measuring the flow of water supply and drainage, industrial circulation, sewage treatment, oil and chemical reagents, compressed air, saturated and superheated steam, natural gas, and various media in large, medium, and small pipelines.