1) Inappropriate amount of oil, too little or too much lubricating grease

The bearing housing should be oiled regularly according to the requirements of the work. After the bearing is refueled, sometimes the temperature is high, mainly because of too much refueling. At this time, the phenomenon is that the temperature continues to rise, and after reaching a certain point (generally about 10°C~15°C higher than the normal operating temperature), it will remain unchanged, and then gradually drop.

2) The grease added to the bearing does not meet the requirements or is polluted

If the lubricating grease is not selected properly, it is difficult to form a uniform lubricating oil film, which cannot reduce the internal friction and wear of the bearing, insufficient lubrication, and the temperature of the bearing will rise. When different types of grease are mixed, a chemical reaction may occur, causing the grease to deteriorate, agglomerate, and reduce the lubricating effect. Contaminated grease will also increase the temperature of the bearing. Dust will fall into the grease during the process of adding grease, causing grease pollution, causing the grease inside the bearing box to deteriorate, destroying the bearing lubrication, and increasing the temperature.

Therefore, appropriate grease should be selected. During maintenance, the bearing box and bearing should be cleaned, and the refueling pipeline should be checked and dredged. Different types of grease are not allowed to be mixed. If other types of grease are replaced, the original grease should be cleaned first; during operation and maintenance Add grease regularly, and the grease should be kept properly for moisture-proof and dust-proof measures.

3) Insufficient cooling

Check whether the pipeline is blocked, whether the inlet oil temperature and return water temperature exceed the standard. If the cooler is not selected properly, the cooling effect is poor, and it cannot meet the requirements of use, it should be replaced in time or a new cooler should be installed side by side. The axial flow induced draft fan should also check the heat preservation and sealing of the core cylinder.

4) After confirming that the above problems do not exist, check the alignment of the coupling and the bearingThe alignment of the coupling must comply with the process standards. When aligning axial-flow induced draft fans and hydraulic couplings, etc., the thermal expansion of equipment during operation should also be considered. The impeller side of the induced draft fan expands due to heat, and the bearing box rises; when the temperature rises during the operation of the hydraulic coupler, the bearing box expands and the bearing rises, so the motor should be higher when aligning, and the reserved amount depends on the characteristics of the equipment and It depends on the temperature parameters in operation.