Altitude protection device

B - Operations – Transporting – 64 – D

Patent

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Details

B64D 10/00 (2006.01) A62B 17/00 (2006.01)

Patent

CA 2444040

The altitude protection device according to the invention for an acceleration protection suit (1) operating according to the hydrostatic principle and having a plurality of liquid-filled veins (4) consists of a bladder (3) inserted in a pocket (2) and consisting of an elastic plastic. A knitted spacer fabric, preferably consisting of monofilament material, is enclosed in the pocket (2). This fabric is non-compressible under the loads to be provided and thus defines a minimum volume in the interior of the bladder (3). The bladder (3) is closed off or opened relative to the surrounding air in the aircraft cabin by means of a valve (5). The valve (5) is set up in such a way that it is opened if(see formula I) and closes if (see formula II) where (see formula III) represents the rate of change in the cabin pressure (see formula IV) and (see formula IV) represents a presettable maximum value of the rate of change. If the valve (5) closes and the cabin pressure falls further, the air located in the bladder (3) inflates the bladder (3) and the pocket (2), thus leading to an increased tensile stress in the fabric of the acceleration protection suit (1). This is transmitted to the veins (4). Their internal pressure consequently also rises; this results in an increased internal pressure in the entire acceleration protection suit (1).

L'invention concerne un dispositif de protection d'altitude pour une combinaison (1) de protection contre l'accélération (combinaison anti-G) fonctionnant selon le principe hydrostatique et comprenant plusieurs veines (4) remplies de liquide. Le dispositif selon l'invention est constitué d'un soufflet (3) en matière plastique élastique inséré dans une poche (2). Le soufflet (3) renferme un tissu maillé de distance, de préférence en matière monofilaire. Ce tissu est incompressible dans les conditions de contrainte prévisibles et définit ainsi un volume minimal à l'intérieur du soufflet (3). Le soufflet (3) est fermé ou ouvert au moyen d'une valve (5) par rapport à l'air ambiant dans la cabine de l'avion. La valve (5) est réglée de façon à être ouverte si dp/dt<=dp/dt|max et à se fermer si dp/dt>dp/dt|max', dp/dt représentant le taux de variation de la pression dans la cabine (en N/m?2¿ /s) et dp/dt|max représentant la valeur maximale préréglable du taux de variation. Si la valve (5) se ferme et que la pression dans la cabine continue à diminuer, l'air se trouvant dans le soufflet (3) gonfle le soufflet (3) et la poche (2), ce qui provoque un effort de tension accru dans le tissu de la combinaison anti-G (1). Cet effort de tension accru se transmet aux veines (4), ce qui entraîne une augmentation de leur pression interne. Il en résulte une pression interne accrue dans toute la combinaison anti-G (1).

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