Oil mist lubrication system---key technologies

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1. Methods of generating oil mist. There are many ways to create mist. Common methods mainly include ultrasound, Venturi tubes, and swirling jets. Depending on the structure, different atomization principles and effects are achieved under various parameters. 2. Comparison of several atomization methods: Each of the various atomization methods has its own characteristics and suitability; for oil mist lubrication, the latter two methods that use compressed air as a power source are more appropriate. Venturi tubes are more widely used in industrial applications, have a relatively simple structure, and their technology is more mature. However, compared with swirl jet atomization, its main problem is that it produces a larger number of larger-diameter oil mist particles, and only a very small fraction of the absorbed oil is converted into oil mist to reach the lubrication surface. Due to differences in structure and principle, the outlet of a venturi oil mist generator produces only an axial-flow jet, whereas the outlet of a swirling jet atomization generator emits a high-speed rotating jet ； The rotating jet separates larger particles by centrifugal force; indeed, the oil mist particles produced by a rotating jet oil mist generator have a smaller diameter and are cleaner (in terms of the amount of large oil mist particles). Through experimental comparisons, when oil mist is transmitted in the output pipeline, the venturi generator generally causes significant condensation within the first 15 meters (this condensation results from large oil particles not being separated from the oil mist), and its effective transmission distance is typically 30 meters. This clearly cannot meet the petrochemical enterprises’ need to transport over 80-200 meters. The transmission distance of the atomizing head, which utilizes the principle of rotating jet atomization, is more than sufficient to meet the requirements of the petrochemical industry over distances of 80–200 meters. The amount of oil that recondenses in the oil mist delivery pipe is less than 3% of the output from the generator, and this recondensation mainly occurs within a range of 3–5 meters from the outlet.