Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal for other than internal combustion engine – or...
Patent
1997-12-08
2000-04-25
Knight, Anthony
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal for other than internal combustion engine, or...
277577, 277637, 277939, 277551, F16J 1508
Patent
active
060535059
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for sealing between two assembly parts that are movable relative to one another and in particular, to a device for sealing on the shut-off elements of flue gas fittings.
2. Description of the Related Art
German Patent No. DE 38 15 402 A1 discloses a device for sealing the contact zone between a movable shut-off element of a pipeline and a stationary seat, which uses an elastic seal in the form of an elongated spring-steel strip as the sealing element and is positioned in the sealing area. Outside of the arched sealing zone, in the longitudinal direction of the sealing element, the spring-steel strip has two bends. The two longitudinal edge areas of the spring-steel strip point to the same side and are placed one atop the other, as clamping edges, and can be attached to the movable shut-off element or to the stationary seal seat by means of a clamping device (e.g., a screw connection). This seal has proved to be very effective, particularly when the relative movement which occurs between the spring-steel strip and the matching seal seat during the closing process is roughly vertical relative to the arched sealing zone. In cases when the relative movement during closing is more tangential relative to the arched sealing zone, situations of extreme stress for the spring-steel seal sometimes develop, which can result in the spring-steel strip being lifted up from the supporting surface and, in consequence, in breakage of the spring-steel strip.
In order to avoid negative consequences of this type, it is known from WO 95/02136 to provide a supporting profile in the interior of the sealing element. This supporting profile, which serves as a hold-down device for the spring-steel strip, rests on the supporting surface of the spring-steel strip near the bend located farthest from the clamping point and prevents the strip from lifting up when the strip experiences tangentially directed forces. The hold-down device can be designed, for example, as a generally V-shaped profile, and it is secured between the clamping edges of the spring-steel strip by means of the clamping device. Because extraordinarily corrosive conditions frequently occur in flue gas fittings, the hold-down device, like the spring-steel strip, must be made of high-alloy material, making it quite expensive. It is also disadvantageous that when a large-area flue gas damper equipped with one of the known sealing elements is opened, the break-away torque resulting from the hold-down device can be undesirably high.
SUMMARY OF THE INVENTION
The present invention provides a novel and unobvious sealing device that overcomes the shortcomings of the prior art. In accordance with the present invention, a device for sealingly connecting two assembly parts that are movable relative to each other includes a holding collar that sourroundingly overlaps a spring-steel strip over a portion of the strip's axial length. The collar thus prevents the strip from disadvantageously separating from a supporting element when the strip is exposed to forces oriented generally tangential to the strip.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings, wherein like reference characters denote similar elements throughout the several views:
FIG. 1 is a perspective view of a sealing device having an L-shaped supporting element and configured in accordance with the present invention;
FIG. 2 is a cross-section view taken at a right angle to the longitudinal axis of the device of FIG. 1;
FIG. 3 is a schematic cross-section view of the device of FIG. 2 depicting deformation by a generally horizontally directed tangential force H shown in dashed lines;
FIG. 4 is a schematic cross-sectional view of the device of FIG. 2 depicting deformation by a generally vertically directed force V shown in dashed lines;
FIG. 5 is a cross-section view taken at a right angle to the longitudinal axis of a sealing device having a strip-type supporting element and configured in accordance with the present invention;
REFERENCES:
patent: 2790614 (1957-04-01), Miller
patent: 2891289 (1959-06-01), Guilbert
patent: 3020185 (1962-02-01), Moffitt et al.
patent: 4141107 (1979-02-01), Sheiman et al.
patent: 4223660 (1980-09-01), Lang
patent: 4441726 (1984-04-01), Uhl
patent: 4724863 (1988-02-01), Connor
patent: 4790502 (1988-12-01), Saegusa
patent: 4811529 (1989-03-01), Harris et al.
patent: 5118916 (1992-06-01), Hucik
patent: 5193823 (1993-03-01), Janich
Knight Anthony
Mannesmann AG
Pickard Alison K.
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