Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1992-06-02
1993-11-23
Cuchlinski, Jr., William A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277144, 277192, 277 961, 432115, F16J 1516, F16J 1534
Patent
active
052637247
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a sealing assembly of a pair of relatively rotatable members.
BACKGROUND ART
In known assemblies of this kind, one set of axially acting urging means have been used for urging arcuate sealing segments into sealing engagement With the sealing surface on the first member, said first member usually being stationary, whereas another set of radially acting urging means have been used for urging the arcuate sealing segments into sealing engagement with the sealing surface on the second member, usually a rotary member.
Sealing assemblies of this kind are often used for sealing the ends of large or very large rotary drums, such as those used in rotary kilns and the like. Because of the large size it is often necessary to use a large number of sealing segments, such as twelve or more. This means, of course, that a corresponding number of axially acting urging means for each sealing segment will be required.
DISCLOSURE OF THE INVENTION
It is the object of the present invention to provide a sealing assembly of the kind initially referred to, in which the mechanism for urging the sealing segments into sealing engagement with the various sealing surfaces is considerably simplified and hence more reliable in operation and less costly to produce, and this object is achieved with a sealing assembly of the kind referred to above, which according to the present invention is characterized by characterized by an arrangement wherein a single urging means is employed which acts on the arcuate sealing segments and produces two components of force, one acting axially to press the arcuate sealing segments against one of the sealing surfaces, while the other acts to press the arcuate sealing segments against the other of the sealing surfaces. The generation of the components is produced by forming one of the sealing surfaces at an acute angle relative to the axis of rotation of the relatively rotatable first and second members.
With this arrangement, the radially acting urging means are used for urging the sealing segments into engagement both with the sealing surfaces on the first member and the sealing surfaces on the second member.
BRIEF DESCRIPTION OF THE DRAWING
In the following detailed description the present invention is explained with reference to the drawing, in which FIG. 1 is a sectional view of a part of a rotary drum and a part of a stationary housing cooperating with said drum to form a seal therebetween, and FIG. 2 is an end view, partly broken away, of a portion of the structure in FIG. 1 taken in the direction of arrow II in FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
One end of a rotary drum 1 of a rotary kiln is provided on its outside with a sealing ring 2, the latter being welded to the outside of the drum 1 and having on outside conical sealing surface 3; in the example shown surface 3 forms an oblique angle 4 of substantiall 15 degrees with the axis of rotation (not shown) of the rotary drum 1.
The drawing also shows that end of a stationary housing 5, with which the rotary drum 1 cooperates to form a sealed joint.
On the side of the housing 5 facing to the right in FIG. 1 of the drawing there is formed a substantially radially extending sealing surface 6 cooperating with a sealing surface 7 on one of a number of sealing segments 8 each extending in continuation of each other all the way around the sealing ring 2 on the drum 1.
In each sealing segment 8 there is formed a "long hole" or slot 9, through which extends a tubular bushing 10. As seen in FIG. 1, the sleeve or bushing 10 is slightly longer than the thickness in the axial direction of its sealing segment 8, so that there is a slight distance in the operating condition shown from the right-hand side of the segment 8 to the opposing side of a disk 11 being held in the position shown by a bolt 12 also holding the bushing 10 securely in position relative to the housing 5.
On the side facing the rotary drum 1, each segment 8 is provided with a sealing pad 13 of metal or other mater
REFERENCES:
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patent: 2659588 (1953-11-01), Blanchard
patent: 3098659 (1963-07-01), Shepler
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patent: 4212474 (1980-07-01), Arai
patent: 4252331 (1981-02-01), Siegel
patent: 4342555 (1982-08-01), Bohanszky
patent: 4405137 (1983-09-01), Webb
patent: 4502702 (1985-03-01), Nixon, Jr.
patent: 4554748 (1985-11-01), Nixon, Jr.
Andersen Nils V.
Hansen Ib T.
Cuchlinski Jr. William A.
Cummings Scott W.
Volund Miljoteknik A/S
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