How to choose the small DC fan.

How to choose the small DC fan.
There are so many brands on the market of the cooling fan, choose a good DC cooling  fan for your equipment is also very important.In the current cooling technology, fan’s auxiliary cooling function is more and more important along with the improvement of precision instrument.So choose  good cooling fans for instrument is very important.Then how to choose a good DC cooling  fan in the vast market ?

1. Choosing from the brand: good brand fan means choose quality, so it is important to ensure the quality of the DC fan.

2. Choose from the appearance: Look from the outer surface should be overall thick, color is more pure (especially black, with color fan is not important), at the edge of the box leaves have no burrs, see the thickness of the blades (very important because is too thin to break), with the hand to knead frame without too much deformation.

3. Choosing from the bearing: the bearing is divided into two kinds of ball bearings and oil bearing. Ball bearing service life is long, the noise is small, but the price is very expensive.The service life of oil bearing is a third shorter than ball bearings, will may be occur some noise after use a period of time  (more than one year), but the price is cheap.After know more of above we can choose the correct one,but if some ball fan is the price with oil fan price, stating that the ball bearing is old or out products,pls don’t buy.

4. Choose after running: when the fan is normal operate:

A. caught the fan and feel its vibrate, and transform different angel, if the feeling is the same that means the vibration of the fan is very good, if there are vibrations, may produce a total shock in case box,before when starting up the fan will occur a loud sound which mainly be occured when starts shaking.

B. should only hear the wind (some high speed might be have electromagnetic acoustic), if there are other voice shows its quality is not very good.If the dc fan speed is not very high as 7 cm fan speed does not exceed 3500 RPM, but the loud wind voice can explain the poor quality of the fan!

C. by hand to stop the fan rotation a minute or so(don’t put the blade broken), with the hand to touch the blades center to feel the temperature, if the high temperature is not qualified,to prevent fan in the die was burned down and cause a fire.