Bearing temperature rising
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Why does the temperature of the centrifugal pump motor bearings rise from 40 degrees to 70 degrees after applying grease, only to drop again? Wouldn’t applying grease reduce frictional resistance? I would like to ask everyone how bearings dissipate heat when they are operating normally, and why the temperature rises after applying grease before dropping again
70 degrees represents a stable temperature; normal bearings reach this stable state after 1-2 hours of operation
Rolling friction also involves friction, and friction generates heat. When the heat generated is equal to the heat dissipated, the temperature stabilizes. Stirring the grease also generates heat.
New grease has high viscosity; adding too much of it leads to friction losses, as well as increased friction heat. Be careful with the amount of grease used to prevent the bearings from overheating. It is recommended to use less grease per application in the future~~
Based on my personal analysis, right after butter was added, there was too much of it; the butter covered the shaft. As it continued to rotate, the temperature of the butter increased, and the continuous rotation caused the butter to be flung off, which in turn led to a drop in temperature. I would appreciate guidance from fellow sailors
We have encountered this situation before as well; it is mainly due to an excess amount of grease. When the grease is first added, the temperature is low and its viscosity is high; friction generates heat, and an excess amount of grease hinders the dissipation of this heat. As the equipment operates, some of the grease is forced out, which enhances heat dissipation; at the same time, the viscosity of the lubricating oil decreases, thereby reducing the temperature.
After refueling, the original cooling structure was damaged.
I hope Haiyou can make it clear; I’m ignorant