There is erosion on the surface of the rotor of the screw compressor; what causes this?
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Dear experts: One of the compressors in our company’s ice machine has been damaged. After having it disassembled by the manufacturer, it was found that there was severe erosion on the surface of the rotor; it is preliminarily assumed that this was caused by a lack of lubricating film on the rotor surface, combined with liquid present within the compressor. Are there any other possible reasons? It worked normally before, with no abnormal noises.
You want to make a quality compensation for some other reason, right? Looking at the photos, it seems to be caused by wear and tear; it’s likely due to untimely oiling. Continue the analysis downstairs.
The equipment has been in use for several years, and the original manufacturer has been responsible for its maintenance. The good thing is that it has worked well all this time, with no vibrations or abnormal noises. It’s not that a claim is necessary, but I’ll have to buy another ice machine soon. If it’s due to quality issues on the part of the manufacturer or problems with maintenance, I probably won’t buy products from that manufacturer in the future!
It seems like there’s a lack of oil. Also, are there coatings on the surface of this rotor and inner cylinder?
The oil level is within the normal range, and the filter element is quite clean as well
Have there been any significant changes during operation, such as a sudden rise in temperature that led to an increase in the gap between the male and female rotors and resulting seizure, or has the bearing used for positioning the male and female rotors failed after prolonged operation, causing the clearance between the moving and stationary parts to exceed the acceptable limits?
Has the manufacturer analyzed the reason for the liquid presence? Is the gas-liquid separator broken? Is it still starting and stopping frequently? If it’s not a lack of oil, then the possibility of there being liquid is much higher. The liquid boiling leads to poor lubrication, and wear of this kind can also be explained accordingly.
It has been running stably; judging from the erosion on the rotor surface, it wasn’t caused over just a day or two.
The manufacturer’s analysis is too simplistic; it only states that the rotor surface is dry with no oil film, indicating poor lubrication, and suspects that liquid is present in the compressor, which has led to a failure in lubrication
Mm-hmm, looking at the pictures it does seem to be caused by long-term wear; sudden locking doesn’t result in this condition. The issue can only be analyzed from the perspective of oil and liquid presence at the compressor inlet