The temperature of the sliding bearing at the motor coupling end of the Fusheng Grade 3 centrifugal air compressor reached the alarm value in the afternoon.
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As shown in the diagram, this sliding bearing is lubricated by lubricating oil and is equipped with an oil slinger. Before noon, the temperature of these bearings in the two identical units was similar; however, around 3 p.m., the temperature of the bearing in one of the units was about 5 degrees higher than that of the other unit, reaching over 90 degrees, close to the shutdown threshold of 95 degrees. I would appreciate some advice from those with more experience!
Have it inspected for disassembly; such high-speed rotating equipment does not come equipped with oil rings. This oil supply requires a pressure pump. Check the surface of the shaft bearings and the surface of the thrust bearings, then measure the clearances and levelness of each part. For reference.
This bearing comes with an oil ring. I’ve only taken one apart.
The lower bearing shell can be removed to check its condition, and then a gap can be adjusted; the oil level in the oil level gauge should be kept at around half.
Our air compressor here also has three stages; the motor has a capacity of 1500 KW. Oil pumping systems are used for lubricating both the motor and the main unit. The main unit is imported, while the motor is domestic-made. The motor often suffers from vibration problems, and it’s difficult to resolve these issues. I’ve heard many people say that many of the equipment used in public utilities is of a lower-spec version – is that true?
For domestic motors such as those produced by Shanghai Electric Machinery Factory, there are generally no major issues. If a newly installed motor exhibits excessive vibration, it is recommended to measure the soft feet, check the alignment, and inspect the foundation. Measure the vibrator at several positions ahead of and behind the equipment to identify the source of vibration.
The motor bearings of these compressors are equipped with oil slinger rings. Please disassemble the bearing for inspection, clean it and inspect it again before reinstalling it. When reinstalling, be sure to measure the magnetic center line of the motor.