Causes of Oil Leakage:
Positive Pressure Zone During Fan Operation:
When the fan operates, a positive pressure zone is formed between the bearing housing on the impeller side and the impeller. Air enters the bearing chamber through the gap between the casing and the shaft sleeve, carrying the lubricating oil out.
Design Defects in the Shaft Sleeve:
The shaft sleeve between the bearing housing on the impeller side and the impeller may have design flaws. Over time, this causes loosening. The collision and friction between the shaft sleeve and the shaft increase the gap, allowing air to enter the bearing chamber and carry out the lubricating oil, accelerating the leakage.
Countermeasures:
Adhesive Injection and Addition of a Diverter Ring:
Once the leak source is identified, the problem can be effectively resolved by injecting adhesive into the bearing housing and adding an external diverter ring.
Install Auxiliary Equipment:
For centrifugal fan bearing housing oil leakage issues, a negative pressure device can be installed. This negative pressure oil extraction system will draw the oil into the fan’s intake air duct, preventing oil from contaminating the bearing housing and the ground.
While this method may cause lubricating oil to accumulate within the fan casing, improving labyrinth seals, installing exhaust caps, and using felt seals can help reduce oil contamination and extend the service life of the lubricant.
Eliminate the Impact of Airflow:
To address the issue of the shaft sleeve loosening, the gap should be securely filled. To prevent air from entering the bearing housing, it is recommended to use high-pressure grease injection between the shaft sleeve and the shaft. Additionally, using the outer ring and diverter ring to change the airflow direction will help eliminate oil leakage from the bearing.