国产精品99久久久久久董美香-国产精品99久久久久久www-国产精品99久久久-国产精品99久久99久久久看片-国产精品99久久-国产精品999在线

How much do you know the technical indicators of the cooling

How much do you know the technical indicators of the cooling fan?
 
When you choose a cooling fan, it will have a parameter and index. Many people who don’t know the cooling fan don’t know what these mean. I believe everyone knows the model, current and power of the fan. Basic definition of equipment. The following cooling fan manufacturer-Ruiapple Electronics introduces the technical indicators in detail.
 
　Fan air volume
 
　Air volume refers to the total volume of air discharged or taken in by the cooling fan per minute. If it is calculated by cubic feet, the air volume unit is CFM; if it is calculated by cubic meters, it is CMM. The air volume unit often used by a cooling fan is CFM (about 0.028 cubic meters per minute). The air volume is the most important indicator to measure the heat dissipation capacity of the cooling fan. The larger the air volume, the higher the cooling capacity of the cooling fan.
 
　Fan pressure
 
Air volume and air pressure are a pair of mutually restrictive parameters. Generally speaking, the higher the air pressure, the lower the air volume, while the higher the air volume, the lower the air pressure. For two cooling fans of the same model, one has a higher air volume than the other. One is bigger, and its wind pressure must be lower than the other.　
 
 speed of the fan
 
　Fan speed refers to the number of times the fan blade rotates per minute, the unit is rpm. The fan speed is determined by the number of turns of the coil in the motor, the operating voltage, the number of fan blades, the inclination angle, the height, the diameter and the bearing system. Speed ??and fan quality are not necessarily related. The speed of the fan can be measured by the internal speed signal or externally.
 
　Fan noise
 
Fan noise is related to friction and air flow. The higher the fan speed and the greater the air volume, the greater the noise caused, and the vibration of the fan itself is also a factor that cannot be ignored. Of course, the vibration of a high-quality fan will be very small, but the first two are difficult to overcome. To solve this problem, we can try to use a larger fan. When the air volume is the same, the working noise of the large fan at a lower speed should be smaller than that of the small fan at a high speed. Another factor that we easily overlook is the bearing of the fan. As the fan rotates at a high speed, there is friction and collision between the shaft and the bearing, so it is also a major source of fan noise.