Thomas W Ross

US Patent:

48460800, Jul 11, 1989

Filed:

May 26, 1988

Appl. No.:

7/199139

Inventors:

Thomas W. Ross - Beaverton OR
Robert B. Hill - Beaverton OR
Byron L. Goodspeed - Kelso WA

Assignee:

Anthony Ross Company - Beaverton OR

International Classification:

F23L 500

US Classification:

1101825

Abstract:

Removable apparatus for regulating air flow through an air port in a chemical recovery furnace. A plenum mounted adjacent an air port inside a wind box associated with the furnace supplies combustion air from the wind box to the furnace through the air port, and an adjustable damper mounted inside the plenum regulates the velocity and quantity of air flowing through the plenum. An access port in the plenum allows viewing of the air port opening through the plenum. An actuating mechanism withdraws the damper from the field of view to a retracted position wherein the damper depends from the top of the plenum chamber spaced apart from the air port opening. For airflow damping, the actuating mechanism moves the retracted damper toward the air port opening until the damper is adjacent to the opening; then a positioning mechanism pivots the damper to a predetermined position in the air stream adjacent the opening. The damper positioning mechanism comprises a spring loaded cylinder that holds the damper by spring tension, when retracted, above the flow of air through the plenum chamber. Upon further compression of the cylinder by the actuating mechanism, the reduced length of the compressed cylinder forces the damper downward into the air stream.