The invention provides a unique rotary dryer, rotary kiln air seal to prevent fugitive air from entering a kiln or dryer at the feed and discharge breechings. The new seal is a steel contact seal comprised of formed radiused sections which ride on a wear plate affixed on the rotating drum. The seal utilizes a single floating labyrinth resistance, allowing for radial expansion of the drum and uneven drum surface contact. The seal sections are spring loaded with bent stainless steel spring clips. The seal is so designed as to accept maximum drum longitudinal expansion as well.
The seals may be used as kiln seals, kiln breeching seals, kiln air seals, kiln or dryer leaf seals, kiln carbon block seals, high temperature radial kiln seals, vacuum kiln seals or pressure kiln seals.
These and further and other features of the invention are apparent in the disclosure, which includes the above and ongoing written specification, with the claims and the drawings.
As shown in
As shown in
As shown in
As shown in
As shown in
Inner cylindrical faces 72 of the sealing elements 60 ride on the outer surface 12 of an annular wear plate 90 on the drum 10 end, as shown in
Packing material fills the packing space 52. The packing material may be resilient to keep faces 72 of the sealing elements 60 pressed against the outer surface 12 of the annular wear plate 90 on the drum 10.
Springs 80, as shown in
Springs 80 are made from flat blanks 81. Holes 82 are lanced to receiving mounting bolts 46. The blanks are bent up 65° at line 83 and down 130° at line 85 to form outer and inner leg sections 84 and 86. The inner edges 88 of inner sections 86 bear against an outer surface of plates 64 of sealing elements 60 to urge the inner faces 72 towards the wear plate 90 and drum 10.
The inner leg sections 86 of the springs 80 are longer than the outer leg sections 84. The spring inner edges 88 engage welded intersections 67 between the radial holder section 66 and the axially extending curved plates 64. That tends to keep the sealing elements aligned in the radial spaces 50, with the inner faces 72 of the sealing elements 60 firmly against the outer surface 12 of the drum 10 or the wear plate 90 on the drum as the drum rotates and also as drum ends and oven ends move relatively longitudinally during temperature variations.
Actions of the spring 80 are shown in
Lateral portions 65 of the curved sealing plates 64 fit in recess 15 of the receiver 14, providing a secondary rotary seal between the drum 10 and the oven structure 20.
The invention provides new air seals including new air seal 30 for a rotary dryer/kiln designed to prevent air from entering the dryer or kiln at either the feed or discharge openings. The new seal is a steel contact device comprised of formed radius sections 64. Inner faces 72 of the sections 64 ride on an outer surface 12 of a wear plate 90 secured to the rotating drum 10. The new seal 30 uses a single floating labyrinth resistance closure. This type of closure allows for radial expansion of the drum 10 and uneven drum surface contact. The seal sections 60 are spring loaded with bent stainless steel spring clips 80. The seal also accommodates drum longitudinal expansion as well.
The seals 30 may be used as kiln seals, kiln breeching seals, kiln air seals, kiln or dryer leaf seals, kiln carbon block seals, high temperature radial kiln seals, vacuum kiln seals, pressure kiln seals.
While the invention has been described with reference to specific embodiments, modifications and variations of the invention may be constructed without departing from the scope of the invention, which is defined in the following claims.
This application claims the benefit of U.S. Provisional Application No. 61/133,866, filed Jul. 3, 2008, which is hereby incorporated by reference in its entirety.
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61133866 | Jul 2008 | US |