Damper with curved extension plates for wide range flow control

Details Damper with curved extension plates for wide range flow control Damper with curved extension plates for wide range flow control

1977-02-16

1978-06-20

Sprague, Kenneth W.

Furnaces

Utilizing powdered fuel

34 57A, 138 46, 137601, 432 58, 110245, 110299, F23D 1900

Patent

active

040955346

ABSTRACT:
A damper for fluid flow control has a curved extension plate positioned with respect to the circular path defined by the end of a pivotal damper blade to provide close control of the effective open area over a wide range of damper openings. The curved extension plate has a straight portion connected tangentially to one end of an arcuate portion. The arcuate portion of the extension plate approximates the shape of a theoretically ideal curve such that in cooperation with pivoting of the damper blade, the free flow area increases approximately linear with damper opening to provide a linear response between damper blade position and fluid flow rate.

REFERENCES:
patent: 2145086 (1939-01-01), Hoof
patent: 2759697 (1956-08-01), Harza
patent: 3286732 (1966-11-01), Alley
patent: 3613256 (1971-10-01), Belopolsky et al.
patent: 3625165 (1971-12-01), Ishigaki
patent: 3691644 (1972-09-01), Schnitzer
patent: 3809361 (1974-05-01), Pfundstein et al.
patent: 3881430 (1975-05-01), Katz

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