An increase in the temperature of the fan’s medium causes abnormal noises, and these noises disappear once the temperature drops
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In the environmental protection industry, zeolite is subjected to desorption and then sent into a catalytic combustion chamber where it is heated and burned. The temperature in the pipes gradually rises; however, when the temperature reaches 140 degrees, the fan starts to make abnormal noises that become louder and louder. But once the heating is turned off and the temperature drops, these abnormal noises disappear. What could be the cause of this? 772772
Check the impeller and inlet shroud for signs of friction
Is the fit between the impeller and the shaft becoming loose at high temperatures?
Is it because the gap between the impeller and the casing is too small, causing them to rub together due to thermal expansion?
Did the opening degree of the fan outlet valve change during the temperature variation? Previously, I encountered similar abnormal noises, and the cause was that the opening degree of the outlet valve was too small; it’s not necessarily due to temperature.
We have encountered a similar situation as well: after thermal expansion, the gap becomes too small, resulting in noise.