Dosed oxygen systems with delivery tube anti-blockage features and a method for delivering respiratory gas
AssigneeSafran Aerotechnics
InventorsStuart David Dixon Walker, Vincent Gérard Greter
Life of this patent
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Abstract
Oxygen-delivery systems are described. The systems may supply emergency respiratory gas on demand to aircraft passengers. To reduce risk of blockage of tubes delivering anti-blocking gas to the face masks worn by the passengers, the systems may be designed to provide a continuous trickle flow of respiratory gas, or one or more anti-blocking pulses of gas, into a delivery tube.
Claims16
A system for delivering respiratory gas to passengers on-board an aircraft, comprising:
- (i) a source of respiratory gas,
- (ii) at least a face mask for a passenger,
- (iii) a delivery valve interposed between the source of respiratory gas and the face mask associated with the delivery valve, and
- (iv) a pressure sensor configured to detect passenger respiration and send a respiration signal upon detection of the passenger respiration,
- (v) a controller configured to control the delivery valve opening for supplying the face mask with a dose of the respiratory gas based on the passenger respiration detection, and
- (vi) an anti-blocking device configured to supply the face mask with anti-blocking gas, so that blockage is removed,
- wherein the anti-blocking device comprises an orifice configured to allow trickle flow of anti-blocking gas.
A method for delivering respiratory gas to passengers on-board an aircraft, comprising:
- detecting respirations of a passenger in a face mask associated to the passenger,
- supplying the face mask with a dose of respiratory gas based on each passenger respiration detection, and
- supplying the face mask with a pulse of anti-blocking gas at a predetermined time after having supplied the face mask with the dose of respiratory gas, the predetermined time being in a range between 10 seconds and 30 seconds, so that an occurrence of blockage preventing detection of respiration is reduced.
A method for delivering respiratory gas to passengers on-board an aircraft, comprising:
- detecting respirations of a passenger in a face mask associated to the passenger,
- supplying the face mask with a dose of respiratory gas based on each passenger respiration detection, and
- comprising supplying each face mask with anti-blocking gas in case of depressurization occurrence, so that an occurrence of blockage, preventing detection of respiration, is reduced.
Dependencies are inferred from the claim text.