How to cool the bearing?

How to cool the bearing?

Bearing temperature is too high, divided into many cases, here is a brief introduction of four common cases to the bearing cooling treatment.

1. When the amount of oil added is improper and the lubricating grease is too much or too little:

Oil the bearing box regularly according to the requirements of the work. Sometimes high temperature occurs after the bearing is oiled, which is mainly due to excessive oiling. At this time, the phenomenon is that the temperature continues to rise, after reaching a certain point (generally 10 ℃ ~ 15 ℃ higher than the normal operating temperature), it will remain unchanged, and then it will gradually decline.

2. When the grease does not meet the requirements or is contaminated:

Improper selection of lubricating grease makes it difficult to form a uniform lubricating oil film, which can not reduce the internal friction and wear of the bearing, and the bearing temperature rises due to insufficient lubrication. When different types of grease are mixed, chemical reaction may occur, resulting in deterioration and caking of grease, reducing the lubricating effect. Grease contamination will also increase the bearing temperature. Dust will fall in the process of grease filling, resulting in grease pollution, which will lead to the deterioration of grease in the bearing box, damage the bearing lubrication and increase the temperature. Therefore, proper grease should be selected, the bearing box and bearing should be cleaned during maintenance, the oil filling pipeline should be checked and dredged, and different types of grease should not be mixed; When replacing other types of grease, clean up the original grease first; Grease shall be added regularly during operation and maintenance, and the grease shall be properly kept to prevent moisture and dust.

3. In case of insufficient cooling:

Check whether the pipeline is blocked, and whether the inlet oil temperature and return water temperature exceed the standard. If the cooler selection is not appropriate, the cooling effect is poor, and can not meet the use requirements, timely replacement or parallel installation of new cooler should be carried out. Axial flow induced draft fan should also check the insulation and sealing of the core tube.

4. If there are no problems in the above aspects, check the coupling:

The alignment of the coupling meets the process standard. During the alignment of axial-flow induced draft fan and hydraulic coupling, the problem of thermal expansion of equipment in operation should also be considered. The bearing box of the induced draft fan rises due to the expansion of the impeller; During the operation of the hydraulic coupling, the temperature rises, the bearing box expands, and the bearing rises. Therefore, the timing motor should be higher, and the reserved amount should be determined according to the characteristics of the equipment and the temperature parameters in operation.