Axial flow fans will encounter various problems when running, which may cause leakage of oil in bearing blocks.
(1) when the axial fan operates, a positive pressure zone is formed between the impeller side bearing block and the impeller. The wind will blow the lubricating oil out of the bearing chamber through the gap between the casing and the outer sleeve.
II. Axial fan There is a planning defect in the shaft sleeve between the impeller side bearing block and the impeller. The long-term operation will appear loose. The shaft sleeve and the shaft will bump and conflict to form a large space collaboration. At this point, the wind will enter the bearing chamber from the open space to bring the lubricating oil out, and increase the leakage rate.
To avoid affecting the normal operation of fans, we should do the following:
1. check the distance between the case and the axle sleeve.
2. choose the inner sleeve of the bearing sleeve and add the technology of the guide ring, and thoroughly deal with the oil leakage problem.
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