Under the design conditions of high-pressure fans, fans with wind pressure of 30kpa-200kpa or compression ratio e ≤ 1.3 ≤ 3 belong to the category of high-pressure fans. At present, air ring vacuum pumps are generally classified as high-pressure fans in the industry. High pressure fans are also called high-pressure blowers, which are different from general centrifugal high-pressure blowers. High pressure fans have a long history. China has made simple wooden hulking fans for many years before BC. The working principle of the car is basically the same as that of the modern centrifugal fan. In 1862, gibel invented the centrifugal fan in England. In 1862, the centrifugal fan was invented in England. Its impeller is concentric, its shell is made of bricks, and its wood leaf wheel is made of straight blades. Its efficiency is only about 40%. It is mainly used for mine ventilation. In 1880, people designed a fan for mine ventilation. Volute. However, the high-pressure centrifugal fan adopts backward curved blades, and its structure is relatively perfect.
In 1892, the cross flow fan was applauded and developed in France. In 1898, Ireland designed the siroc centrifugal fan with forward blades, which has been widely used in various countries. In the 19th century, the axial flow fan has been used in the mine ventilation and metallurgy industry, but its pressure is only 100 × 300pa, and its efficiency is only 15% ≤ 25%. Until the 1940s, the axial flow fan developed rapidly. In 1935, the axial-flow constant pressure fan was first used for boiler ventilation and induced draft in Germany.
