Teach you how to choose a good DC fan
With the continuous improvement of people's living economic standards in China, DC fans are becoming more and more widely used in our lives. This is the main reason that has prompted many DC fan suppliers. So among so many suppliers, how do we want to be? Going to pick a good DC fan?
1, the bearing comes up to choose: Generally, the bearings of the DC fan are divided into two types, one is the ball form, collectively called the ball bearing. There is also an oil-containing, collectively referred to as oil-bearing bearings. The difference between them is that the ball bearings have a long service life and low noise, but the price is very expensive. The service life of oil-impregnated bearings is 1/3 shorter than that of ball bearings. Some noise may occur after a period of use (more than one year), but the price is cheap.
2, from the appearance of choice: from the outer surface should be the overall thicker, the color is relatively pure (especially black, not important to the color of the fan), there is no flash on the edge of the frame leaves, see the thickness of the fan blade ( It is very important because it is too thin and easy to break.) There is not much deformation when the frame is pinched by hand.
3, hear the wind sound (some high speed may have electromagnetic sound), if there are other sounds, the quality is not very good. If the DC fan speed is not very high, a fan speed of seven centimeters does not exceed 3,500 RPM, but the wind is too loud to indicate that the quality of the fan is too poor.
4, look at the parameters on the outer packaging: the following two parameters are provided for your reference voltage: 5V 12V 24V 48V current: running current is less than 250mA (more than 250mA indicates that this product is unqualified).
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Test procedure of fan