Why does the vibration of the air compressor increase during unloading rather than during loading?
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Our factory uses screw compressors, and the vibration level is actually lower when the machine is under load compared to when it isn’t – I’m not sure why. The machine runs at 300 revolutions per minute; what is the standard for vibration levels? What should be the maximum allowable vibration level when the machine is not under load?
JB/T 06430-2002 \"Screw air compressors for general use\", Clause 5.6: The vibration amplitude of screw air compressors shall not exceed 7.1 mm/s. I have also noticed that the vibration of air compressors is greater when they are unloaded than when they are loaded. In my personal opinion, the reason is that when the air compressor is unloaded, the intake valve closes, resulting in a reduced amount of air being compressed; meanwhile, the amount of fuel injected remains unchanged. This leads to a higher proportion of liquid phase in the oil-gas mixture inside the compression chamber.
The vibration intensity should not exceed 7.1 mm/s, approved!
Could you send me the standards? Email: wanqingcai@yahoo.com.cn. Thank you!
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