Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
Aircraft on-board gas generating apparatus comprising a gas concentrator unit having a plurality of molecular sieve beds each adapted for receiving a flow of compressed air as charge gas and delivering a flow of product gas enriched in one constituent gas, valve means operably connected with the sieve beds for cycling the sieve beds through charge/adsorption phases and purge/desorbtion phases, product gas sensor means having a connection with a delivery outlet of the concentrator unit for sensing the concentration of the enriched constituent gas in the product gas delivered by the concentrator unit, pressure intensifier means adapted for receiving a flow of air at one pressure value and delivering to the concentrator unit a flow of air at a required increased pressure value, and means driven by the pressure intensifier means for operating the valve means to cycle the sieve beds in accordance with control signals output by the sensor means, whereby the concentration value of the constituent gas in the product gas delivered by the concentrator unit is maintained within predetermined limits.
Claim 2
Dependent Claim
173 words
Aircraft on-board gas generating apparatus comprising a gas concentrator unit having a plurality of molecular sieve beds each adapted for receiving a flow of compressed air as charge gas and delivering a flow of product gas enriched in one constituent gas, valve means operably connected with the sieve beds for cycling the sieve beds through charge/adsorption phases and purge/desorbtion phases, product gas sensor means having a connection with a delivery outlet of the concentrator unit for sensing the concentration of the enriched constituent gas in the product gas delivered by the concentrator unit, pressure intensifier means adapted for receiving a flow of air at one pressure value and delivering to the concentrator unit a flow of air at a required increased pressure value, and means driven by the pressure intensifier means for operating the valve means to cycle the sieve beds in accordance with control signals output by the sensor means, whereby the concentration value of the constituent gas in the product gas delivered by the concentrator unit is maintained within predetermined limits.
Claim 3
Dependent Claim
21 words
Aircraft on-board gas generating apparatus as claimed in claim 1, wherein the pressure intensifier means comprises an hydraulically driven gas compressor.
Claim 4
Dependent Claim
39 words
Aircraft on-board gas generating apparatus as claimed in claim 2, wherein the hydraulically driven gas compressor comprises a plurality of piston and cylinder assemblies each adapted to provide pressure intensification on the up-stroke and the down-stroke of the piston.
Claim 5
Dependent Claim
46 words
Aircraft on-board gas generating apparatus as claimed in claim 1, wherein said valve means comprise a respective pair of diaphragm valves connected with a respective one of said sieve beds, and said valve operating means comprise a respective pilot valve for each pair of diaphragm valves.
Claim 6
Dependent Claim
42 words
Aircraft on-board gas generating apparatus as claimed in claim 4, wherein each pilot valve comprises a valve member arranged to open and close, in opposite sequence, ports for relieving pressure which urges said respective pair of diaphragm valves towards a closed position.
Claim 7
Dependent Claim
37 words
Aircraft on-board gas generating apparatus as claimed in claim 5, wherein the valve member of each said pilot valve is adapted for operation by a respective cam mounted on a shaft driven by said pressure intensifier means.
Claim 8
Dependent Claim
21 words
Aircraft on-board gas generating apparatus as claimed in claim 1, wherein said gas concentrator unit comprises concentric molecular sieve bed chambers.
Claim 9
Dependent Claim
45 words
Aircraft on-board gas generating apparatus as claimed in claim 7, wherein said sieve bed chambers are filled with a zeolite molecular sieve material suited for adsorption of nitrogen in air passing through said chambers whereby product gas enriched in oxygen is delivered by the apparatus.
Claim 10
Dependent Claim
24 words
Aircraft on-board gas generating apparatus as claimed in claim 1, wherein an inlet to said pressure intensifier means is suited for receiving ram air.