| 摘要 |
A protective breathing apparatus with breathing air circulation and addition of oxygen alone through a lung-controlled valve is to be improved so that no oxygen depletion of the breathing air in the circulation occurs, even if the breath volumes are small, and that preflushing the circulation with oxygen before applying the protective breathing apparatus is unnecessary. In addition to a breathing bag space, a storage space, unfoldable during the exhaling phase and unchangeable during the inhaling phase, is provided in the circulation. |
