02,05,2026 16 views
centrifugal fanhistory
Wind turbines have a long history. China had already produced simple wooden rice hulling windmills many years before the Common Era, which operated on the same principle as modern centrifugal fans. In 1862, Guibert of England invented the centrifugal fan, which had a concentric impeller and casing made of bricks, and a wooden impeller with straight backward blades. The efficiency was only about 40% and it was mainly used for mine ventilation. In 1880, snail shaped casings and backward curved blades were designed for mine ventilationcentrifugal fanThe structure is already quite complete.
In 1892, France developed a cross flow fan; In 1898, the Irish designed the Sirocco style with forward facing bladescentrifugal fanAnd widely adopted by various countries; In the 19th century, axial flow fans were already used for mine ventilation and metallurgical industry blowing, but their pressure was only 100-300 Pa and efficiency was only 15-25%. It was not until the 1940s that they developed rapidly.
In 1935, Germany first adopted axial flow isobaric fans for boiler ventilation and induced draft; In 1948, Denmark developed an axial flow fan with adjustable moving blades for operation; Rotary axial flow fan, radial acceleration axial flow fan, diagonal flow fan, and cross flow fan; In 2002, China's explosion prevention measurescentrifugal fanWidely used in chemical, petroleum, mechanical and other fields, Changlin East Explosion proofcentrifugal fanIt has also experienced development.
centrifugal fanworking principle
centrifugal fanIt is based on the principle of converting kinetic energy into potential energy, using a high-speed rotating impeller to accelerate gas, then decelerate and change the flow direction, converting kinetic energy into potential energy (pressure). At a single levelcentrifugal fanIn the middle, gas enters the impeller from the axial direction, changes to a light direction as it flows through the impeller, and then enters the diffuser. In a diffuser, the gas changes its flow direction causing deceleration, which converts kinetic energy into pressure energy. The increase in pressure mainly occurs in the impeller, followed by the expansion process. At multiple levelscentrifugal fanIn the middle, use a reflux device to allow the airflow to enter the next impeller, generating higher pressure.
centrifugal fanPerformance characteristics
centrifugal fanEssentially, it is a variable flow constant pressure device When the rotational speed is constant,centrifugal fanThe pressure flow theoretical curve should be a straight line Due to internal losses, the actual characteristic curve is curvedcentrifugal fanThe pressure generated is greatly affected by changes in intake temperature or density For a given intake volume, the pressure generated at the highest intake temperature (lowest air density) is the lowest For a given pressure and flow characteristic curve, there is a power and flow characteristic curve When the blower operates at a constant speed, the required power increases with a decrease in intake temperature for a given flow rate
