【 Auto cooling fan 】 Technical characteristics
auto cooling fan, air pressure and air volume are two relative concepts. In general, under the manufacturer's cost considerations, to design the fan air volume is big, have to sacrifice some wind pressure. If the fan can bring a lot of air flow, but the wind pressure is small, the wind is less than the bottom of the radiator ( That is why some fan speed is high, volume is very big, but it is the reason why cooling effect is not good) , on the contrary, wind pressure is often means that the air volume is small, there is not enough air and heat sink for heat exchange, also causes the cooling effect is bad
in addition to the heat dissipation effect, auto cooling fan, fan noise is also a widely concerned problem. The size of the fan noise is generated when the fan noise, affected by various factors, the unit is decibels ( dB) 。 When measuring the noise of the fan needs in the sound attenuation of noise is less than 17 db and fan, one meter distance along the direction of the fan rotor on the fan air inlet, measured using A weighted way. The fan noise spectrum characteristics is also very important, so you also need to use spectrometer to record the noise of the fan frequency distribution, generally requires little as far as possible, the noise of the fan and cannot exist different sounds. Fan noise is related to the friction, air flow. Fan speed is higher, the air volume, the greater the noise caused by the will, the greater the other factors of the vibration of the fan itself is also cannot be ignored. Of course the high quality of fan vibration will be small, but the two in front of the person is difficult to overcome. To solve this problem, we can try to use the size bigger fan. Should be under the condition of the same volume, big fan work at low speed when the noise is smaller than small fan noise at high speed work. Another we easy to overlook the factor is the fan bearing. Because of the high-speed fan rotates to the friction between shaft and bearing collision, so also is one of the main fan noise source.
auto cooling fan 细节。 asp吗? Cpid = 90
auto cooling fan at http:///products- 细节。 asp吗? cpid = 114