Mechanical energy and technical indicators of the pressure ventilator fan

- Jul 01, 2019-

The pressure ventilator fan is mainly a mechanical machine that relies on input mechanical energy, increases gas pressure and discharges gas. It is a driven fluid machine. The exhaust pressure is less than 1.5 × 10 ^ 4 Pa. Modern ventilators are widely used for ventilation, dust extraction and cooling in factories, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and air intake in boilers and industrial furnaces, cooling in air conditioning equipment and household appliances And ventilation, drying and selection of grain, inflation and propulsion of wind tunnel sources and hovercraft.


The working principle of the pressure ventilator is basically the same as that of the turbo compressor. However, because the gas flow rate is low, the pressure does not change much. Generally, it is not necessary to consider the change of the specific volume of the gas, that is, the gas is treated as an incompressible fluid.


The relationship between the fan and the fan: The fan is the abbreviation of the gas compression and gas transmission machinery in China. The so-called fan includes the fan, the blower, the compressor and the Roots blower, but does not include the volumetric blower such as the piston compressor. compressor. A ventilator is a type of fan, but people usually refer to a ventilator as a fan, and a ventilator is another name for a fan.


The performance parameters of the pressure ventilator are mainly flow, pressure, power, efficiency and speed. In addition, the size of noise and vibration is also the main technical indicator of the ventilator. The flow rate is also called the air volume and is expressed in terms of the volume of gas flowing through the fan per unit time. Pressure, also known as wind pressure, refers to the pressure rise of the gas in the ventilator, which is divided into static pressure, dynamic pressure and full pressure. The total pressure is equal to the difference between the outlet section of the fan and the total pressure of the inlet section. The static pressure is equal to the difference between the outlet section of the fan and the static pressure of the inlet section. The dynamic pressure refers to the dynamic pressure of the average velocity of the airflow at the exit section of the fan. In the same section, the total pressure of the airflow is equal to the sum of the static pressure and the dynamic pressure.