With the progress of science and technology, people pay great attention to the quality of goods when they buy them. The quality largely affects theexperience of using. The poor experience seriously affects the mood, and it needs to be repurchased. People have only paid attention to the appearance and price of fans.
Now they are paying attention to power saving, mute, comfort and so on. Today's news let's see how practical is NAKKA silent fan?
The scientific principle of NAKKA silent fan blades
The common AC fan leaves are mostly 3-5 leaves, but the noise of this kind of fan leaves is large.Its physical knowledge involves Bernoulli's principle, sound waves produced by fluid vibration, air turbulence, air pressure pulsation, vortex and so on, mainly related toacoustics and flow mechanics. This kind of fan blade edge cuts air, and the tip willconstantly throw out small whirlpool (tip vortex). The airflow impacts the bracket and themesh cover, and the turbulence of the airflow forms the turbulence noise, so the decibel ofthis kind of fan is much larger than that of NAKKA silent fan.
NAKKA silent fan designed a double-layer 18 leaf fan, because the nature of sound is themechanical vibration of air media, and the smaller the vibration amplitude, the lower thenoise. So the 18 double-layer fan blades designed by NAKKA silent fan, the load of singleblade is greatly reduced, the pressure fluctuation is weak when the air is cut due to thedecrease of single air extrusion strength, the air vibration amplitude and fluctuation aresmaller, and the noise is naturally reduced and the decibel is low.
Secondly, for NAKKA silent fan,the inner and outer two layers of fan blades form a doublespiral duct, and the air flow will flow smoothly along the surface of the double layer blade:the air flow of ordinary small blade fan is easy to peel off and turbulence on the surface ofthe blade; 18 leaves layered diversion, smooth and stable air flow, soft diffusion of spiralsoft wind, reduce the wind noise caused by air impact and turbulent friction; The fan leaves
greatly affected the decibel of the electric fan.The 18 fan leaves designed by NAKKA silent fan fundamentally solved the problem ofvolume.
The scientific principle of NAKKA silent fan motor
The scientific principles related tothe motor noise of ordinary electric fans are mainly divided into four parts: bearing frictionnoise, whole machine resonance noise, motor electromagnetic vibration noise and solidconduction vibration noise. There are four types of mechanical noise of fans: first, thebearing friction noise.
According to the formula of sliding friction, the shaft and the inner wall of thebearing rub each other; The second is the resonance noise of the whole machine. Everypart has its own inherent vibration frequency. The periodic vibration generated by themotor rotation is just the same as the frequency of the part, which will trigger forcedresonance.
The vibration amplitude is multiplied, and the noise becomes thick and harsh; Moreover,the electromagnetic vibration noise of the motor, the constantly changing current willgenerate alternating magnetic field, repeatedly pull the iron core of the motor, and theslight vibration of the iron core will generate a dull low-frequency buzz; Finally, the solidconduction vibration noise, the efficiency of solid transmission vibration is much higherthan that of air, the vibration generated by the motor spreads around along the hard partssuch as the bracket and shell, driving the whole fuselage to vibrate and beat the air, further amplifying all the noise.
The NAKKA silent fan adopts a brush less DC motor, which abandons the carbon brushstructure used by traditional motors to switch magnetic fields and keep friction and impact,and relies on the circuit board and Holzer elements to control the current; From thephysical level, the sliding friction of the old brush motor will generate strong vibrationnoise, and the brush free structure directly eliminates this friction sound source.
The high-end version also uses sine wave stable power supply, so that the alternatingmagnetic field in the motor will fluctuate smoothly, there will be no violent shaking of thecurrent pulse, pulling the vibration of the core, reducing electromagnetic buzz; With oil filmbuffered bearings, the shaft friction is reduced, and the vibration source of the wholemachine is greatly reduced, so as to achieve quiet and low noise when the motor isrunning.NAKKA silent fan improves the noise from two parts of fan blade and motor, sothat the decibel is low. It is not only silent but also power saving, and it is highly practical.You can buy it at ease.
