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A bladeless fan (sometimes called an air multiplier) blows air from a ring with no external blades. Its blades are hidden in its base. The first concept was created by Toshiba in 1981. Dyson claims that its bladeless fans (U.S. Patent 8,454,322) produce a more constant airflow than traditional fans.
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The air is drawn in by a turbine in the base and then directed up into a ring. It comes out of a crack all around the ring and passes over a shape like that of an aircraft wing. Industrial designer Sir James Dyson named his fan the Air Multiplier.
Dyson sued Chinese companies because they began selling bladeless fans for much less than Dyson.
bladeless fan
In 2015, Panasonic announced a spherical bladeless fan. It is a bladeless fan that is spherical in shape and takes in air through one side and blows it out the other.
Air Multiplier Fan
There are no visible moving blades in this fan. The blade is hidden inside the pedestal of the fan. In 2009 James Dyson first, introduces a new innovation in the bladeless fan by adding air multiplier technology. This Dyson air multiplier fan generates airflow up to 55mph. The fan contains a brushless electric motor and this motor rotates nine asymmetrical aligned blades that attached with a rotor. Usually, upper frame of this fan is ring shape. The frame is not flat rather than it manufactures such that the edge can create a curve of 16-degree angle slope. The air flows through the channel in the pedestal of the fan when the motor is turn on. After that, the air flows through the hollow tube. Then the air is shot out through 16 mm slits. This fan flows smooth air rather than the buffeting air of blade fan. Air is rushing alone and it comes with the flat bottom. The air doesn’t resist at all. When it goes top, it creates an area of negative pressure. The area has to accelerate over a curve. That’s why makes the air lift up. The motor blades can pull 20 liters of air per second. When air flows through the front of the fan, the air behind the fan also drags through the tube as well. The property of the air is called inducement. By the law of entrainment, the air surrounding the edges of the fan also flows with the direction of the breeze. So this inducement and entrainment increase the air flow. Dyson fan manufacturer Jameco Electronics claims that the air multiplier technology increases the output of the air flowing through the tube by 15 times or more than the base air. The engineers of Jameco Electronics tested that the fan can blow off 300 liters of air per second.