Causes and countermeasures of excessive temperature in dry goods fan bearing

2020-12-29 10:36:28

Cause analysis of excessive bearing temperature of fan

(1) The concentricity of bearing packages on both sides of the fan has machining and installation errors. This situation often occurs when the bearing package is located on both sides of the fan impeller, and the construction is not in accordance with the specification or the reference point is inaccurate during the installation, and the horizontal displacement and elevation error exist after the installation of the bearing package on both sides. Another situation is that the bearing package is integrated, and the concentricity of the two boring holes is out of tolerance during the manufacturing and processing of the bore at the bearing installation position. This error is basically an impossible defect, and it can be said that once the bearing package appears, it can only be scrapped.

Solution: Remove the fan assembly and leveling and aligning the bearing packages on both sides.

(2) The fan bearing package itself is inclined, and the bearing is inclined in the bearing package, which leads to the high temperature of the fan bearing during operation. The reason is that the quality of fan installation and maintenance is not high, and the bearing runs at the critical edge of allowable adjustment Angle.

Solution: Remove the fan assembly and bearing package, and recalibrate the bearing package.

(3) There are clamps in the bearing package and the bearing pressure lead is too tight, which leads to the high operating temperature of the bearing. The cause is that when the fan is running, because there is no clearance on both sides or at the top of the bearing installation position, the heat generated by the bearing at high speed causes the inner ring to expand outward, while the outer ring of the bearing is crushed by the side side or the top of the bearing package and cannot expand outward, which leads to the reduction of the bearing clearance and the bearing burnout accident.

Solution: Remove the fan assembly or lift the assembly and open the tile on the bearing.

(4) abnormal bearing operation, resulting in bearing fever. The temperature rise is mainly caused by peeling, pitting and clearance increase due to fatigue wear of the bearing. It can generally be determined by listening to the sound of the bearing and measuring vibration.

Solution: Re-press the lead to adjust the clearance of the bearing roof.

(5) in the casting process of the bearing package, the internal water cavity is small, resulting in the reduction of cooling strength; Bearing water cavity is blocked, and the flow of cooling water is small, leading to bearing fever.

(6) the bearing package does not add the specified grease according to the standard. The general situation is that the staff at the post is worried about the lack of oil in the fan, which will cause the bearing to burn out. When the amount of oil is added when refueling, the phenomenon is that the temperature continues to rise. When it reaches a certain point (generally about 10 ~ 15℃ higher than the normal operating temperature), it will remain unchanged, and then it will gradually decline.

High fan bearing temperature countermeasure

(1) The concentricity of bearing packages on both sides of the fan has machining and installation errors. Standardize the maintenance procedure, check the inspection personnel on site, strictly implement the maintenance operation standard of installation fan, and control the quality. At the same time, the size of the new spare parts should be carefully checked. If necessary, we can contact Western Heavy Industry Co., Ltd to check the concentricity of bearing package boring on the machine tool.

(2) The fan bearing package itself is inclined, and the bearing is inclined in the bearing package, which leads to the high temperature of the fan bearing during operation. The solution is also to strictly implement the installation of fan maintenance standards, quality control. Consult WeChat xyafj888.

(3) There are clamps in the bearing package and the bearing pressure lead is too tight, which leads to the high operating temperature of the bearing. Bearing packages exist card to help solve the method is: the new bearing package after the installation, to surveying and mapping of bearing bag side help, put the bearing into the bearing pack bearing installation position and to a certain pressure, bearing is measured with a feeler and side clearance of the seat, according to the data with scraper open help, at the bottom of the bearing and the bearing contact surfaces after opening for not less than 1/3 of the perimeter. The solution to the bearing pressure lead is to adjust the clearance of the bearing top and reserve the thermal expansion of the bearing.

(4) abnormal bearing operation, resulting in bearing fever. It can be judged by measuring the fan vibration trend and sound every day, and a scientific and reasonable replacement cycle can be developed according to the trend.

(5) in the casting process of the bearing package, the internal water cavity is small, resulting in the reduction of cooling strength; Bearing water cavity is blocked, and the flow of cooling water is small, leading to bearing fever. Solution: the bearing package in the casting process, the internal water cavity is small, resulting in reduced cooling strength, generally this situation rarely occurs, but once this is the reason, the bearing package must be scrapped. If the bearing water enclosure is blocked, remove the bearing enclosure and wash the bearing water enclosure with a pickling pump.

(6) the bearing package does not add the specified grease according to the standard. The bearing box shall be added with the specified amount of grease and oil according to the requirements of regular work.