What's with the big fan

The eccentricity of fan blades is the main cause of noise. The blade center of gravity of high-quality fan is on the shaft, which runs smoothly and has low noise. However, inferior fans often have a certain deviation, and the center of gravity of the blades will not cause "eccentricity" on the shaft. After such a fan rotates, it is equivalent to an oscillator (the oscillator is to add an eccentric wheel to the motor shaft). As the use time becomes longer, the bearing of the fan is gradually worn out, or the heat sink of the fan is not firmly installed and becomes loose. The simplest solution to this fault is to install the fan as firmly as possible, so that it will not vibrate. Of course, this method does not solve the substantive problem because the blades of the fan are still "eccentric"; Another method is to inject oil into the bearing of the fan to buffer vibration, thus reducing noise; There is another way to solve the problem fundamentally: remove the fan blade and hang it with a thin iron wire through the small hole in the center of the fan blade. If one end falls off, it means it is heavy. You can grind it on the grinding wheel several times. After several times, when the fan blade is hoisted with fine wire, if the fan blade can stand still in the horizontal position, it means that the transformation is successful.

Several problems of fan oil injection;

1. sewing machine oil or engine oil, I suggest using four-stroke motorcycle oil, because sewing machine oil is very thin, with strong fluidity and volatility, and it won't be long before the fan will recur after oiling. Moreover, sewing machine oil has little buffering effect on vibration and has little effect on reducing noise. The use of engine oil just avoids the above two disadvantages.

2. Sealing problem after refueling. The label paper is attached to the refueling part of the fan. After degreasing the label paper, the label paper can't be used any more. What should be used instead? I chose four or five layers of scotch tape. Find a roll of cellophane paper, cut it horizontally with a knife, about four or five layers, and then peel off these four or five layers of cellophane paper together to use. Be careful not to use only one layer of tape paper, because a layer of tape paper is easy to vibrate and make noise when the fan rotates, and it may be damaged, causing oil splashing. Another advantage of using scotch tape instead of label paper is that it is clear at a glance whether the fan is short of oil, and it is not necessary to disassemble it.