System to deliver oxygen in an aircraft
AssigneeZodiac Aerotechnics
InventorsSeverine Aubonnet, Henri Marotte
Life of this patent
Estimating the term…
Abstract
The invention relates to a system to deliver a respiratory gas to crew members in a cabin of an aircraft. The system includes at least one respiratory mask, an ambient air inlet for admission of ambient air into the respiratory mask, a source of additional gas, supply lines to transport the additional gas to the respiratory mask, a mixing chamber provided on the supply lines to mix the additional gas with ambient air to supply a respiratory gas corresponding to a mixture of the additional gas and the ambient air to the respiratory mask, regulation system to regulate the additional gas content of the respiratory gas at least partly as a function of the aircraft altitude.
Claims6
A system to deliver a respiratory gas in a normally pressurized cabin of an aircraft to passengers and one or more crew members, said system comprising:
- equipment for pressurizing the cabin at a cabin altitude of between approximately 5000-8000 feet for passengers and crew members;
- a respiratory mask in the cabin for the crew member,
- an ambient air inlet for admission of ambient air into said system,
- a source of additional gas,
- supply lines to transport said additional gas to said respiratory mask,
- mixing chamber provided on said supply lines for feeding said respiratory mask with said respiratory gas corresponding to a mixture of said additional gas and said ambient air, and
- a regulation system configured to regulate the additional gas content of said respiratory gas while at the cabin altitude at least partly as a function of the aircraft altitude according to the equation:
- FIO2=21%+FPREOX(Zaircraft)
- wherein:
- FIO2=total percentage of additional gas in said respiratory gas, and
- Zaircraft=aircraft altitude,
- such that, when FPREOX(Zaircraft)>0, FPREOX(Zaircraft) varies incrementally as Zaircraft varies incrementally.
A system to deliver a respiratory gas in a normally pressurized cabin of an aircraft to passengers and one or more crew members, said system comprising:
- equipment for pressurizing the cabin at a normal cabin altitude of between approximately 5000-8000 feet for passengers and crew members;
- a respiratory mask in the cabin for the crew member,
- an ambient air inlet for admission of ambient air into said system,
- a source of additional gas,
- supply lines to transport said additional gas to said respiratory mask,
- mixing chamber provided on said supply lines for feeding said respiratory mask with said respiratory gas corresponding to a mixture of said additional gas and said ambient air, and
- a regulation system configured to regulate the additional gas content of said respiratory gas as a non-binary function of aircraft altitude while at the normal cabin altitude.
A system to deliver a respiratory gas in a normally pressurized cabin of an aircraft to passengers and one or more crew members, said system comprising:
- equipment for pressurizing the cabin at a cabin altitude for passengers and crew members;
- a respiratory mask in the cabin for the crew member,
- an ambient air inlet for admission of ambient air into said system,
- a source of additional gas,
- supply lines to transport said additional gas to said respiratory mask,
- mixing chamber provided on said supply lines for feeding said respiratory mask with said respiratory gas corresponding to a mixture of said additional gas and said ambient air, and
- a regulation system configured to regulate the additional gas content of said respiratory gas as functions of the aircraft altitude and a fixed, guaranteed decompression time of the aircraft.
A system to deliver a respiratory gas in a normally pressurized cabin of an aircraft to passengers and one or more crew members, said system comprising:
- equipment for pressurizing the cabin at a cabin altitude for passengers and crew members;
- a respiratory mask in the cabin for the crew member,
- an ambient air inlet for admission of ambient air into said system,
- a source of additional gas,
- supply lines to transport said additional gas to said respiratory mask,
- mixing chamber provided on said supply lines for feeding said respiratory mask with said respiratory gas corresponding to a mixture of said additional gas and said ambient air,
- a regulation system to regulate the additional gas content of said respiratory gas at least partly as a function of the aircraft altitude,
- wherein the regulation system is configured to regulate the additional gas content of the respiratory gas as a function of aircraft altitude according to the equation:
- FIO2=21%+FPREOX(Zaircraft)
- wherein:
- FIO2=total percentage of additional gas in said respiratory gas,
- Zaircraft=aircraft altitude, and
- FPREOX(Zaircraft)≦FREF(Zaircraft), with FPREOX(Zaircraft) a percentage function of Zaircraft,
- FREF(Zaircraft) being a percentage function of Zaircraft and given by the following table:
- Zaircraft(ft)
- FREF(Zaircraft)
- Zaircraft(ft)
- FREF(Zaircraft)
- 25,000
- 0
- 36,000
- 20
- 30,000
- 7
- 37,000
- 23
- 31,000
- 9
- 38,000
- 27
- 32,000
- 11
- 39,000
- 31
- 33,000
- 13
- 41,000
- 35
- 34,000
- 15
- 43,000
- 40
- 35,000
- 17
- 45,000
- 46.
A method of using a system to deliver a respiratory gas to a crew member in a normally pressurized cabin of an aircraft, said system comprising:
- a respiratory mask in the cabin for the crew member,
- an ambient air inlet for admission of ambient air into said system,
- an additional gas source,
- supply lines to transport said additional gas to said respiratory mask,
- mixing chamber provided on said supply lines for feeding said respiratory mask with said respiratory gas corresponding to a mixture of said additional gas and said ambient air,
- said method comprising
- pressurizing the cabin to a cabin altitude lower than the aircraft altitude for passengers,
- delivering said additional gas to said respiratory mask when worn by a crew member at least as a function of the aircraft altitude, wherein delivering the additional gas is according to the following equation:
- FIO2=21%+FPREOX(Zaircraft)
- wherein:
- FIO2=total percentage of additional gas in said respiratory gas,
- Zaircraft=aircraft altitude, and
- FPREOX(Zaircraft)≦FREF(Zaircraft), with FPREOX(Zaircraft) a percentage function of Zaircraft,
- FREF(Zaircraft) being a percentage function of Zaircraft and given by the following table:
- Zaircraft(ft)
- FREF(Zaircraft)
- Zaircraft(ft)
- FREF(Zaircraft)
- 25,000
- 0
- 36,000
- 20
- 30,000
- 7
- 37,000
- 23
- 31,000
- 9
- 38,000
- 27
- 32,000
- 11
- 39,000
- 31
- 33,000
- 13
- 41,000
- 35
- 34,000
- 15
- 43,000
- 40
- 35,000
- 17
- 45,000
- 46.
Dependencies are inferred from the claim text.