Regardless of the configuration and manufacturing level of the oversized ceiling fan, in terms of wind efficiency alone, the index to measure the advantages and disadvantages of the oversized ceiling fan should be the air volume and coverage area generated under comparable conditions (same speed, same diameter).
With the advancement of technology, high wind efficiency blades can produce the same number or even more air volume with a smaller number of blades. Just like today's automotive industry, the displacement of automobile engines is gradually developing towards miniaturization, but the engine power and torque are still enough to drive large-mass cars. Similarly, as long as the same air volume is produced and the same fan coverage area is produced, then the fewer the number of blades, the higher the wind efficiency of its fan blades. Even from the point of view of saving resources and protecting the environment, a smaller number of blades should be encouraged.
The blades manufactured by Hengzhengtong's stamping process are different from the blades of other extrusion manufacturing processes, and its blades gradually narrow, thin and slightly twisted along the radius, which makes it possible to produce greater air volume under the same conditions.
We know that under the same rotational speed, the linear velocity of each point of the blade along the radius direction is very different, taking the oversized ceiling fan with a diameter of 7.3 meters as an example, the linear velocity of the tip part of the blade is 7 times that of the root part of the blade. If such a large speed difference is used with extruded blades of equal width, it will inevitably lead to extremely low wind efficiency in the root part of the blade with very low linear speed, and usually form a central cavity phenomenon.
The blade of Hengzhengtong has a very low online speed and a wide blade width and uses a large-sized fan blade to supply air, while the width of the blade tip part with a high online speed is relatively narrow, and the blade with high linear speed is used to supply air. This significantly improves the problem of uneven radial air supply of the blades and improves the wind efficiency of the blades.
In addition, the Hengzhengtong blade gradually thins and slightly twists along the radius direction, so that the static pressure and dynamic pressure ratio of the blade are gradual, which optimizes the air supply efficiency, thereby generating a large air supply volume.