Core principle differences
high-pressure water screw machine adopts water lubrication technology, and pure water is directly injected into the compression chamber as lubrication, cooling and sealing medium to completely avoid lubricating oil participating in the compression process. Although high-pressure oil-free screw machine does not use oil lubrication, it relies on special coated rotor, high-precision air gap control and dry operation design, and relies on air or inert gas to realize non-contact sealing and heat dissipation.
Clean air guarantee mechanism
the compressed air output by water lubrication screw machine is naturally oil-free, and the water quality meets ISO 8573-1 after multistage filtration. Class 0 (Zero oil) standard; Oil-free screw machine ensures oil-free contact throughout the compression chamber through strict material selection and process control, which also reaches Class 0 level, but requires higher intake filtration and internal cleanliness.
Applicable pressure and working condition characteristics
both types of equipment are suitable for high-pressure air compressor scenarios, and the common exhaust pressure range is 7- 40 bar. Water lubrication model in medium and high pressure Section (10–25 bar) the energy efficiency is better, and the water cooling feature is conducive to stable temperature rise; The oil-free model is in ultra high pressure (> 30 bar) and frequent start and stop, the long-term reliability performance in high temperature environment is more prominent.
Maintenance and operation concerns
the water lubrication system should regularly monitor the water quality conductivity, replace the filter element and drainage component to prevent scaling or microbial growth; Oil-free models focus on rotor clearance detection, bearing life management and seal status assessment, the requirements for installation Foundation and vibration control are stricter.