Figure 1. Sketch drawing for formation of Oil-Air
As shown in figure 1, in oil-air lubrication system, compressed air and lubricant are mixed to form a gas-liquid two-phase turbulent flow。Compressed air flows at the high speed of 55-85m/s in pipeline. Under the influence of the compressed air, a continuous oil film is gradually formed and slowly moved with a velocity of 2.5-5cm/s in spiral shape. Since the flow velocity of compressed air and lubricant is quite different, they are not really integrated and compressed air hasn’t been atomized. They are separated from each other when discharging from the pipeline.In oil-air lubrication system, to ensure the lubricant is well distributed to the lubricating point in slowly, continuously and uniformly way, air is supplied continuously while oil is pumped intermittently. In other words, according to the set duty cycle, the system will feed the metered quantities of oil at given intervals. The quantity and time interval can be adjusted and rationed based on the consumption of oil in each lubrication point. Due to the continuous function of the compressed air, the lubricant supplied intermittently in the pipeline can form the successive film to ensure the lubricant to the lubrication points is fresh and continuous all the time. And it also can ensure every lubrication points can get the equal quantity per unit of time.