Pulse jet and venturi liner

Claim 1

In a pulse jet type dust collector for separating particulate material from a gaseous carrier thereof: a tube sheet dividing the interior of said dust collector into a clean gas and dirty gas plenum chambers, an elongated open ended tube of permeable filter media mounted on and suspended from said tube sheet for separating said particulate material from said gaseous carrier by permitted passage of the latter therethrough from the outside to the inside of the filter media, a rigid venturi element of non-deformable material and of a first predetermined configuration mounted on said tube sheet and disposed in the open end of said tube of permeable filter media, said rigid venturi element defining a bore for countercurrent passage of gaseous carrier and cleaning gas therethrough having an intermediate portion of lesser transverse dimension than that of the terminal portions thereof, and whereby said configuration of said venturi element is at least in part determinative of the air flow characteristics through said permeable filter media the improvement comprising, an elastically deformable lining member of an external configuration complemental to that of the interior of said rigid venturi element and sized to be deformably insertable into and being retainably mounted within said rigid venturi element in intimate interfacial engagement therewith to modify the internal configuration thereof, said lining member defining a bore of second predetermined configuration for passage of cleaned gaseous carrier therethrough that is selectively contoured to modify the air flow characteristics attendant said rigid venturi element into which it is inserted.