measuring principle
The anti blocking wind speed and air volume measurement device is based on the S-shaped pitot tube measurement principle. When there is airflow flowing in the pipe, the windward side is impacted by the airflow, where the kinetic energy of the airflow is converted into pressure energy. Therefore, the pressure inside the windward pipe is relatively high, which is called "full pressure". The pressure inside the windward side is called "static pressure" due to not being impacted by the airflow, and the pressure inside the pipe is called "static pressure". The difference between total pressure and static pressure is called differential pressure, Its size is related to the wind speed inside the pipe, and the higher the wind speed, the greater the differential pressure; The wind speed is small, and the differential pressure is also small. The relationship between wind speed and differential pressure conforms to the Bernoulli equation.
characteristic
1. The design of the S-type anti clogging structure ensures that the speed measuring device will not experience clogging during long-term operation under conditions where the concentration of the pipeline medium is greater than 50%.
2. The pressure loss is minimal, greatly reducing the power consumption of the fan, and the energy-saving effect is obvious.
3. The core components are made of wear-resistant materials, ensuring continuous use for more than one major repair cycle.
4. Accurate and stable signal output, good linearity and reproducibility.
5. The multi-point grid method is used to measure large-sized pipelines, and the gas flow rate is accurately measured by arranging multiple points with equal cross-section.
6. The requirements for straight pipe sections are very low. Under the working condition of 1.5D straight pipe section, linearity and accuracy can still be guaranteed.
7. The differential pressure signal is large and can generate a differential pressure greater than twice that of Pitot tube, Annubar, etc.
technical parameter
1. Measurement accuracy: 1%, 2%
2. Measurement device manufacturing material: S316 or Icr18Ni9Ti stainless steel
3. Measurement medium: Dry gas or gas containing dust
4. Working temperature: -100~400 ℃
5. Pipeline diameter: 50 mm ≤ D ≤ 8000
6. Nominal pressure: PN ≤ 16Mpa
7. Reference standards: ISO 3966-197, JB/T5325-1991, and GB/T2624-2006
8. Connection method: plug-in flange connection, plug-in threaded connection, pipeline flange connection, pipeline threaded connection
structural style
The wind speed and air volume measurement device is divided into various structures based on different usage scenarios, operating conditions, and installation methods.
Anti blocking display type air volume measurement device:
Measurement principle based on Pitot tube;
High measurement accuracy, good linearity, and importance;
Can be installed at any angle;
High cost-effectiveness and very economical operating costs;
Negligible pipeline pressure loss, effectively reducing fan energy consumption;
Multiple point array distribution within the pipeline cross-section, with average measurement speed.
Backrest tachometer, flute shaped tachometer:
Both are non-standard speed measuring devices.
The flute tube installed in the pipeline can measure the average airflow velocity in one go. The double flute shaped tube is a combination of a full pressure measuring tube and a static pressure measuring tube, with a row of full pressure measuring holes on the upstream surface of the full pressure tube and a row of static pressure measuring tubes on the back of the static pressure tube.
The principle of the backrest tube is similar to that of the pitot tube, and the dynamic pressure value is obtained by measuring the difference between the total pressure and static pressure. It has dynamic pressure amplification properties and needs to be calibrated before use.
Double Venturi Velocimetry Tube:
Used for measuring the air supply and flue gas flow rate of power plant boilers;
The results are simple;
The pressure loss is small, accounting for only about 1% of the generated differential pressure volume;
The requirements for straight pipe sections are not strict;
The dynamic pressure amplification factor is the highest, several times or even more than ten times that of the pitot tube and averaging tube devices;
Each double venturi tachometer is calibrated before leaving the factory, with a testing report attached. After installation, there is generally no need to perform on-site calibration.
Designed for impurities such as wind, powder, and dust in the pipeline
