First, understand the causes of the oil leakage and take appropriate countermeasures:

Causes of Oil Leakage During Fan Operation:

1. Oil leakage due to pressure differences: When the fan operates, there is a positive pressure zone between the bearing housing on the impeller side and the impeller. The air can enter the bearing chamber through gaps in the casing and the shaft sleeve, carrying the lubricating oil out.

2. Design defects or wear in the bearing housing and shaft sleeve: Another cause of oil leakage is the design flaw between the bearing housing on the impeller side and the impeller. Over time, the shaft sleeve may loosen. The collision and friction between the shaft sleeve and the shaft can lead to excessive clearance, allowing air to enter the bearing chamber through the gap and carry the lubricating oil out, which accelerates the oil leakage.

Solutions:

1. After identifying the oil leak source, you can address the issue by injecting adhesive into the bearing housing or adding a diversion ring externally.

2. Addressing pressure and clearance issues: Since the bearing housing on the impeller side is in a positive pressure zone, the air can blow through the gaps between the casing and shaft sleeve into the bearing chamber, carrying the lubricating oil out. To prevent this, the gap can be sealed or reduced by applying sealing measures.

Auxiliary Equipment Application:

1. To address oil leakage from the bearing housing of a centrifugal fan, a negative pressure device can be installed. This negative pressure oil removal system will draw the lubricating oil into the intake air duct of the fan. Although oil leakage can cause contamination of the bearing housing and the ground, once the oil is drawn into the fan, it accumulates inside the casing, preventing it from directly leaking onto the ground.

2. While this method reduces some contamination, it may lead to oil accumulation within the fan casing, potentially contaminating the impeller and increasing the frequency of lubricating oil replacement.

Other Improvement Measures:

1. Improving labyrinth seals, installing exhaust caps, or adding casing felt seals can help reduce the fan’s oil leakage problem.

Eliminating Wind Problems and Solving Loosening Issues:

1. To resolve the issue of the shaft sleeve loosening, the gap must be filled securely. To prevent air from leaking through the shaft sleeve gap, a high-pressure injection technique can be used to fill the gap between the shaft sleeve and the shaft.

2. Changing the design of the outer ring of the shaft sleeve and the diversion ring to alter the airflow direction can also eliminate oil leakage from the bearings.