Fire detector scanning arrangement
AssigneeThe Air Preheater Company, Inc.
InventorRichard Franklin Stockman
Life of this patent
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Abstract
A detector that monitors infra-red ray emission from an air preheater to detect a temperature rise that precedes a fire within the air preheater. The detector of infra-red rays is alternately moved between a "detecting" stage within the air preheater and a "cleaning" stage in clean ambient air where particulate matter deposited thereon by dirty gas may be removed to maintain the detector at a high degree of operating efficiency.
Claims5
A heat exchanger housing including inlet and outlet ducts for a heating fluid and for a fluid to be heated, a matrix of heat absorbent material carried in said housing, means for alternately subjecting said matrix to the heating fluid and the fluid to be heated, an infra-red ray detecting means positioned in the housing to view the infra-red rays emitted by the matrix, an opening in said housing adapted to receive the infra-red ray detecting means, an air lock having an enclosure with an open side thereof in common with the opening of said housing, a pivotal carrier supporting the infra-red ray detecting means, and means moving the infra-red ray detector from a position within said housing where it faces said matrix to a position within said air-lock where it covers the open side thereof.
Dependencies are inferred from the claim text.