What should be done if the bearing temperature of a high-temperature boiler induced draught fan rises?

What should be done if the bearing temperature of a high-temperature boiler induced draught fan rises?

What should be done if the bearing temperature of a high-temperature boiler induced draught fan rises? I believe this is a problem many people face when using such fans. Today, I will explain this issue. The main points are as follows. 1. Please check whether there is an appropriate clearance between the journal and the bearing. The bearing clearance directly affects the fan’s performance. If the clearance between the shaft and the journal is too small, the amount of oil entering the bearing housing will decrease, friction will increase, and the heat generated will not be dissipated; consequently, the bearing temperature will rise, leading to a shaft seizure. If the clearance between the journal and the bearing is too large, the resistance to lubricant circulation will decrease; however, by increasing the oil volume above the journal, the heat generated by friction between the journal and the bearing can be dissipated. Although this can lower the bearing temperature, it will increase bearing friction. Typically, the effect is controlled at 2.5/100 of the journal diameter. 2. Strictly control the alloy material of the axial bearing. If the alloy material does not meet material standards, the bearing is prone to fatigue, wear, spalling and pitting; if the clearance increases, the temperature will rise. Generally, this can be determined by listening for vibrations. 3. The bearing and journal must have an appropriate contact angle and contact point. The bearing is driven by the high-speed rotating shaft to circulate lubricating oil, thereby forming a pressure oil film between the journal and the bearing. The temperature of the bearing housing is directly determined by whether the contact points and contact angle between the bearing and journal of the axial fan are appropriate. Generally, adjusting the contact angle to 55–60° results in a friction coefficient of 2–60°. Within this contact range, fewer than four contact points per cm³ indicates low temperature and good performance.