Method and device for protecting passengers of an aircraft...

A - Human Necessities – 62 – B

Patent

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A62B 7/00 (2006.01) A62B 7/14 (2006.01)

Patent

CA 2468813

The invention concerns a method for protecting passengers of an aircraft against the effects of depressurization, which consists in supplying respirators with oxygen at a flow rate which is an increasing function of the cabin pressure altitude through a restriction and an economiser bag and in producing re-inhalation of only a first fraction of the expired gases by collecting said first fraction in a flexible bag for re-inhalation, whereof the volume when it is inflated is not less than a clearance in the respiratory tract-mask assembly and which communicates with the mask. The invention also concerns a protective device comprising a central supply unit (46) providing an adjustable flow rate to the masks (10) connected to the general duct via the economiser bag (16). The re-inhalation bag (28) delays re-inhalation and only stores an initial fraction of the gases expired at each inhalation. The central supply unit comprises means for regulating ambient pressure to limit the additional oxygen flow rate supplied to the masks to only a fraction of the flow rate which would be required in the absence of re-inhalation.

Pour protéger les passagers d'un aéronef contre les effets d'une dépressurisation de la cabine, on alimente les masques respiratoires en oxygène avec un débit qui est une fonction croissante de l'altitude cabine à travers un étranglement et un sac économiseur et on provoque une ré-inhalation d'une première fraction seulement des gaz expirés en recueillant cette première fraction dans un sac souple de ré-inhalation, dont le volume à l'état gonflé est au moins égal au volume mort de l'ensemble voies respiratoires - masque et qui communique avec le masque. Un dispositif de protection comprend une centrale d'alimentation (46) fournissant un débit réglable aux masques (10) reliés à la conduite générale par l'intermédiaire du sac économiseur (16). Le sac de ré-inhalation (28) retarde la ré-inhalation et ne stocke qu'une fraction initiale des gaz expirés à chaque exhalation. La centrale comporte des moyens de régulation en fonction de la pression ambiante pour limiter le débit d'oxygène additionnel amené aux masques à une fraction seulement du débit qui serait nécessaire en l'absence de ré-inhalation.

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