If you want to ask you: How many film fans a fan? A lot of people probably will: 3. Indeed, whether stand fan, ceiling fan or a micro-fan, the market is still "clover" type of fans the most common. But the past two years, three leaves fan no longer "dominant party", "four leaves", "five leaves", "double" type of fan has become popular, several major brands of beauty, Principal Amy fans have to "change of face . "
Increasing number of blades
More hot weather, a home appliance store in Xinjiekou, the fan was placed in a prominent position. The reporters found that although the fans are similar in appearance, but careful count, but not difficult to see the number of blades began to rise. "In the past not to notice, listen to the introduction salesperson know, now has four leaves, five-blade fan, heard about the fan speed is moderate, even if the blow of the night, it will not feel uncomfortable, but also lower the noise, suitable for some light sleep of the people. "Aunt Wang told reporters that members of the public, afraid to sleep for the noise, ran into such a fan, think it is interesting.
The store's sales personnel, taking into account the characteristics of rotational equilibrium, the average number of fan blades are single leaves, evenly distributed in the circle. "However, even when the blades spin resonance easily, easy to damage. In general, a single relatively stable number of fan blades, not easy to sway, but also help to heat up the exhaust." Clover fans the most common and cost also more economical. "According to reports, the more leaves, will only increase the load, when the impeller speed is high, many of the impeller to form a wind shield, the greater the wind resistance encountered. But then, the five-leaf can be Wind "cut" more small, quiet would be better.
Principles from the aircraft wing
According to the U.S. in counter sales personnel, the US's new five-blade fans, by the Northwestern Polytechnical University, aerodynamics expert, Professor Xi Deke use of aircraft wings, propeller theory, and explore the best set of fan blades bend, sweep angle, the most favorable focus stacking line shape and flat shape of leaves. Use of these fan design, the design of the fan has obvious high efficiency, low noise characteristics.
As the "cut" the wind is more uniform, with "five leaves" of the fan not only brought a quiet effect, from the comfort of view can have many choices. Air supply fan can be adjusted to achieve a wider range and more gear. Most of the "clover fan" is basically three wind power regulation, "Five Leaf fan" is more of a block can be.
Especially in low gear operation, air is not very violent, to avoid facing the issue of fan blowing cold easily, and from the perspective of energy conservation is very good. It is understood that to the United States "five leaves silent" fans new, for example, energy efficiency standards to achieve Level 1 - 16-inch fan blade platform style than the national standard value increased by 27%, noise reduction than the national standard value of 15.8% ; click power also reduced by 11.4%, increase energy efficiency ratio of about 24%.
"Double" leaves a greater amount of wind
According to the reporters the military, in addition to the "Five Leaves" fans, the summer, the major brands are also fantastic and the introduction of the "four-leaf", "double" fan blades.
Pioneer's fans, there is a double-blade, electric fans for the benefit of this, sales staff, "said Clover fan sent the wind is normally around the middle of no wind. In the three large leaves which, together with three small leaves, so that fans can send a larger amount of wind, the wind will not be around, no wind, the phenomenon of the middle. "
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