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气涡轮手机的吸引污染,至今仍是使牙科医师苦恼的难题。作者研究手机的吸引污染是如何产生的,把污染限于最小程度的方法,以及用牙科吸管预防污染的效果。 吸引的机理 当踏下脚开关时,气涡轮机传送着～3kg/cm~2的压缩空气,手机内部保持着对外界的正压。即使足离脚开关,涡轮由于惯性旋转,继续排气,此时排出的气从外界回流,手机内部的压力低于外界,产生吸引作用。其吸引压最大为0.98～1.96kPa(10～20cmH_2O),吸引时间是从脚开关断开,至涡轮机完全停止的数秒间,在手机内部产生负压,可吸入1ml以上
The attraction of gas turbine mobile phones is still a difficult problem for dentists. The authors looked at how cell phones attract pollution, how to minimize pollution, and how to prevent contamination with dental straw. Mechanisms of attraction When the foot switch is stepped on, the gas turbine delivers ~ 3 kg / cm ~ 2 of compressed air and the phone maintains a positive pressure on the outside. Even if the foot switch off the foot, the turbine due to inertial rotation, continue to exhaust, this time the exhaust gas from the outside world, the pressure inside the phone below the outside, resulting in attraction. The maximum suction pressure of 0.98 ~ 1.96kPa (10 ~ 20cmH_2O), the suction time is disconnected from the foot switch to the turbine stopped completely within a few seconds, the negative pressure inside the cell phone can inhale more than 1ml