working principle
The working principle of the ventilator is basically the same as that of the turbo compressor, except that the gas flow rate is low and 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.
Development History
Fans have a long history. China has produced simple wooden Shibuya windmills for many years before BC, and its principle of action is basically the same as that of modern centrifugal fans. In 1862, the British Guibei invented the centrifugal fan, the impeller and casing were concentric, the casing was made of brick, and the wooden impeller was made of backward straight blades. The efficiency was only about 40%, which was mainly used for mine ventilation. In 1880, people designed a volute casing for the mine to send the wind, and a centrifugal fan with a backward curved blade. The structure has been perfected.
In 1892, France developed a horizontal flow fan; in 1898, the Irish designed the sirocco centrifugal fan for the forward blade, which was widely used in various countries; in the 19th century, the axial flow fan was applied to the mine ventilation and metallurgical industry. Blasting, but the pressure is only 100 ~ 300 Pa, the efficiency is only 15 ~ 25%, until the 1940s after the rapid development.
In 1935, Germany first used axial-flow equal-pressure ventilators to ventilate and induce winds. In 1948, Denmark made shaft-flow fans with adjustable moving blades; rotary-flow fans, meridional acceleration-axis fans, Both oblique flow fans and horizontal flow fans have also been developed.
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