History of blowers

Blower has a long history. 2000 years ago, China, Babylon, Persia and other countries already use the old windmill for irrigation, grinding grain. After the 12th century, windmills rapid development in Europe. China had been manufactured in BC hulling simple wooden windmill, its action principle is basically the same with the modern centrifugal fan. 7th century in West Asia - probably in Syria, built batch windmill. This region of the world have a strong wind almost always blows in the same direction, hence the construction of these early windmill facing the prevailing wind. They look like now seen a windmill, but has a vertical axis, perpendicular to the axis aligned with the wing, and the carousel device with Trojan is very similar to the arrangement. 12th century in Western Europe there has been granted a windmill. Some people think that, in Palestine took part in the Crusades when soldiers brought home information about the windmill. However, the Western windmill design with Syria windmill is very different, so that they may be independent invented. The typical Mediterranean windmills has a circular stone tower and toward the prevailing wind vane vertical installation. They are still used for grinding grain. In 1862, British Guyana Bell centrifugal fan invention, the impeller, housing for the concentric type, the rear housing with brick, wood to the straight blade impeller, the efficiency is only about 40%, mainly for mine ventilation. In 1880, it devised volute casing for exhaust air of the mine, and backward curved blade centrifugal fan structure has been more perfect. 1892 France developed into a cross-flow fan. In 1898, the Irish people to design a centrifugal fan blades Xi Luoke ago, and is widely used in various countries; the 19th century, has been used in mine ventilation axial fans and metallurgical industry in the blast, but the pressure is only 100 to 300 Pa, efficiency is only 15 to 25%, until the twentieth century, 40 years later before they get rapid development. In 1935, Germany and other first axial flow fan for the boiler pressure ventilation and induced draft. In 1948, Denmark made the operation of variable pitch axial fan; axial fans rotation, meridional acceleration axial fans, mixed flow fans and cross-flow fan; Clarage company was founded in 1874, and in 1997 by the United States Twins fan Group mergers and acquisitions, has become one of the old turbine manufacturers, the development of wind turbines have also been considerable progress.

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