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人戴上自救器以后,从肺部呼出的含有CO_2气和水汽的混浊空气,总有一部份积存在自救器的有害空间里。所谓自救器的有害空间,就是吸气时,同新鲜空气混合在一起被吸入的未排尽的呼出气体之体积。对于化学氧自救器,往复闭路呼吸系统的有害空间,主要指口具、呼吸导管及生氧剂层前面的空间,而循环闭路呼吸系统的有害空间,则主要指口具到吸气阀之间的空间。过滤式自救器的有害空间,主要是口具到呼气阀之间
After wearing a self-rescuer, turbid air containing CO 2 gas and water vapor exhaled from the lungs is always stored in the harmful space of the self-rescuer. The so-called self-help device of harmful space, that is, when inhaled, mixed with fresh air inhaled exhausted exhaled gas volume. For chemical oxygen self-rescuer, reciprocating closed-circuit respiratory harmful space, mainly refers to the mouth, breathing catheter and oxygen agent in front of the space, and closed loop respiratory harmful space, mainly refers to the mouth between the suction valve Space. Filter self-help device harmful space, mainly between the mouthpiece to the exhalation valve