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AssigneeThe Secretary of State of Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorsAllan Jarvis, Richard J. Holmes
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A composite gas filtration system for removal of toxic or harmful agents from a breathable gas supply, wherein a compressor fed pressure swing adsorption unit is placed upstream of an adsorbent carbon filter unit in a gas supply line, characterized in that a plenum chamber is positioned in the gas supply line with one or more inlet orifices supplied by gas treated by the pressure swing adsorption unit, one or more exit orifices leading to the carbon filter unit, and one or more further inlet orifices supplied by gas from upstream of the pressure swing adsorption unit, wherein a device for drawing or propelling breathable gas through the plenum chamber and carbon filter from the further inlet orifices in the event of shut down of the pressure swing adsorption unit and/or compressor is provided. By use of the preferred system of the present invention it is thus possible to operate a high pressure swing adsorption unit in conjunction with an adsorbent carbon filter unit, that not being high pressure type, whereby in event of the high pressure units failing the system automatically switches to a back-up mode not requiring redundant units that would be required in prior art systems.
A method of providing breathable air to a human or animal living area comprising passing air through a composite gas filtration system comprising a compressor fee pressure swing adsorption unit placed upstream of an adsorbent carbon filter unit in a gas supply line, characterised in that in the event of the pressure swing adsorption unit shutting down, air is automatically drawn or propelled from upstream of the compressor and pressure swing adsorption unit through the adsorbent carbon filter unit and passed to the living area.
A composite gas filtration system comprising a compressor fed pressure swing adsorption unit placed upstream of an adsorbent carbon filter unit in a gas supply line, characterised in that a plenum chamber is positioned in the gas supply line with one or more inlet orifices supplied by gas treated by the pressure swing adsorption unit, one or more exit orifices leading to the carbon filter unit, end one or more further inlet orifices supplied by gas from upstream of the pressure swing adsorption unit, wherein a means for drawing or propelling gas through the plenum chamber end carbon filter from the further inlet orifices in the event of shut down of the pressure swing adsorption unit and/or compressor is provided.
Dependencies are inferred from the claim text.