Answer: When multiple air compressors are running in parallel, they must be switched regularly. For air compressors working in a humid environment, switching operation is conducive to draining the moisture in the lubricating oil; If the air compressor is shut down for a long time (such as about a month), the adhered particles on the oil filter or oil fine separator will dry out, blocking the filter holes of the oil filter or oil fine separator fibers, shortening the service life of the filter; The upper part of the air compressor rotor is not soaked in lubricating oil, and the long-term shutdown will cause this part of the rotor to come into contact with humid air and rust; Long-term shutdown will also cause oil scale to accumulate on the air compressor pipeline or main engine, forcing the air compressor to be overhauled.