초록 ▼

A corrosion-resistant volume damper apparatus for use in gas- and vapor-handling duct systems, installed between existing external duct flanges without having to custom cut or otherwise modify the duct system or the volume damper itself. The retrofittable volume damper has a housing or framework wit

A corrosion-resistant volume damper apparatus for use in gas- and vapor-handling duct systems, installed between existing external duct flanges without having to custom cut or otherwise modify the duct system or the volume damper itself. The retrofittable volume damper has a housing or framework with an aperture extending therethrough and a corrosion-resistant damper blade having integral pivot arms. The aperture or bore is of a suitable size and shape to match the duct system within which the volume damper is to be installed. The housing preferably comprises a pair of corrosion-resistant plates of suitably rigid materials. The two plates have a series of through holes permitting the two plates to be bolted together with a damper blade to be rotatably sandwiched between the plates such that one of the pivot arms of the damper blade extends beyond the two plates on a plane perpendicular to, and away from, the axis of the bore. Each of the two plates has substantially semicircular ridges and, optionally, grooves adjacent to the inner edge of the aperture to provide sealing surfaces. The damper blade is rotatably adjustable to partially or completely occlude the bore and is preferably lockable in a desired rotatably adjusted angular position. The housing has standardized attachments allowing the apparatus to be installed between existing flanges on two sections of existing ductwork or against an existing flange on one end of existing ductwork.

대표청구항 ▼

[ What is claimed is:] [1.] A volume damper assembly for mounting to one or more existing flanges of ductwork, said volume damper assembly comprising:a) a damper housing having first and second major surfaces, said damper housing having an opening communicating with said first and second major surfa

[ What is claimed is:] [1.] A volume damper assembly for mounting to one or more existing flanges of ductwork, said volume damper assembly comprising:a) a damper housing having first and second major surfaces, said damper housing having an opening communicating with said first and second major surfaces,said damper housing comprising first and second plates which define said opening, said first plate being removably fastenable to said second plate;b) a damper blade pivotably disposed within said opening, said damper blade including a circular body portion having a diameter larger than said opening, and said damper blade being adjustable in angle for variably occluding said opening,said damper blade further comprising first and second integral pivot arms, said integral pivot arms having axes aligned one with the other and aligned with a diameter of said circular body portion, said integral pivot arms being disposed between said first and second plates of said housing; andc) attachment means for securing said damper housing to at least one existing flange of the ductwork, said attachment means being disposed to align with and engage said at least one existing flange.