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一、前言在航空发动机主轴承腔中,采用金属涨圈接触式密封装置,用来将轴承腔与空气流路或燃气流路隔开,防止高温气体漏入轴承腔焦化滑油与烧坏轴承,并防止滑油漏到高温气体流路中。密封装置前的气体介质压力通常为0.4～1.8巴,介质温度为室温～400℃,主密封介面的滑动速度可达60～120米/秒。为了提高密封效果,一般将2～3道涨圈串联使用,并与篦齿密封组合为复合式密封装置,如图1所示。
I. Introduction In the main bearing cavity of the aeroengine, a metal ring contact seal is used to separate the bearing cavity from the air flow path or the gas flow path, so as to prevent the high temperature gas from leaking into the bearing cavity to coking the oil and burn out the bearing , And prevent oil from leaking into the hot gas path. The pressure of the gas medium in front of the sealing device is usually 0.4-1.8 bar, the temperature of the medium is from room temperature to 400 ° C., and the sliding speed of the main sealing interface can reach 60-120 m / s. In order to improve the sealing effect, generally 2 to 3 rings in series with the combination of grate teeth sealed composite seal assembly, as shown in Figure 1.