Why is water entering the bearing chamber of the exhaust fan?
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For the exhaust fan used in the dryer, the transformer burned out for the first time, but no sufficient attention was paid to this issue; the transformer was replaced and the machine was restarted. The second time, the bearings in the fan’s bearing housing failed. When the bearing housing was opened, water was found inside – it’s not clear what caused this (was the cooling water circulation system intact?)
The cooling water jacket condenses the water vapor near the bearing chamber into water, which then mixes into the lubricating oil. This is why mainstream engineering companies try to use cooling water as little as possible to cool the bearing chamber; instead, they opt for fin-based cooling or air cooling, and only resort to water cooling when no other option is available. Moreover, the design of the bearing chamber must ensure that water vapor does not condense.
Recently, the bearing housings of the company’s exhaust fans have also been leaking water frequently, and it is usually the standby units that are affected. The cooling water pipeline has been checked and there are no issues. The medium temperature is above 150. Last month, water entered one of the bearing housings; no cause could be identified. After cleaning it, the machine was turned on and has been running normally for over a month now. However, water entered the spare unit. Upon disassembly, it was found that the upper half of the bearing’s outer ring was severely rusted and contained water droplets. Ask for the reason
Placed outdoors? Could water entering when the humidity is high be taken into consideration? Is the fuel filler cap not sealing properly?
Why does water get in when the humidity is high? The fan has no oil seal and its rotation speed is not high; please explain.