Window purging system for a combustion instrument

Details Window purging system for a combustion instrument Window purging system for a combustion instrument

G - Physics

01

J

G01J 5/02 (2006.01) B08B 17/02 (2006.01) G01J 5/04 (2006.01) G01J 5/08 (2006.01)

Patent

CA 2073975

ABSTRACT OF THE DISCLOSURE A purging air flow system that causes air to pass over a pyrometer lens or window (28) to keep it clean and free from particulate contaminants has an annular, continuous slot (50) for air inlet around the periphery of the lens (28) to permit flow of air across the lens (28) without any obstructions in the path of flow inwardly from the outer edge of the lens (28). An asymmetric flow pattern is established across the lens surface, either by having a differential size slot (50) at different peripheral portions of the peripheral edge of the lens or window (28), or by providing a radial swirl about the axis of the window (28) so that when the air goes through the slot (50), the tangential velocity creates a moving asymmetric flow pattern on the window surface (28A).

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