| 摘要 |
PURPOSE: A portable oxygen mask is provided to increase use time through recirculating the user's exhalation, mixing the same with high concentration oxygen to produce air having oxygen concentration similar to atmosphere, and breathing the produced air. CONSTITUTION: The portable oxygen mask includes an oxygen bottle(300), an air flow rate regulator(210), a mixing section(200), a breathing section(120), and a recirculating pipe(220). The oxygen bottle stores air having oxygen concentration larger than that of atmosphere. The regulator regulates air flow rate supplied from the oxygen bottle through a connecting hose. The mixing section is connected with the regulator and blends air supplied through the regulator with user's exhalation. The breathing section has a portion closely contacted with and fixed to the user's face, and provides a closed space where the user breathes the air supplied from the mixing section. The recirculating pipe is connected with the breathing section and recirculates user's exhalation to the mixing section.
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