Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal for a pipe – conduit – or cable
Reexamination Certificate
1999-10-14
2001-06-05
Knight, Anthony (Department: 3626)
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal for a pipe, conduit, or cable
C277S624000, C277S626000, C277S926000, C285S110000, C285S368000
Reexamination Certificate
active
06241254
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to the sealing techniques and concerns the sealing of detachable stationary joints of pipelines and manifolds by using the metal elastic gaskets in particular.
BACKGROUND OF THE INVENTION
It is known a detachable sealing device that contains flanges with the contact surfaces of curvilinear or tapered shape, between which a metal gasket with elastic tabs and a rigid peripheral portion are mounted, a cylinder mounting surface for a fixing annular projection of the gasket peripheral part being made in one of the flanges, and an annular groove, in which a retaining releasing ring preventing the gasket against the axial shift during the flange joint is mounted, being made in the flange from the side of one of the gasket tabs (SU, No. 1499032, C1. F 16 J 15/02, published on Aug. 4, 1989).
The device is intended for the operation within a broad pressure and temperature range in the medium of corrosive components with simultaneous action of vibration and dynamic loads.
The disadvantage of this device is the location of the retaining releasing ring in the bottom working part of the flange. The ring is mounted in the groove with radial and axial gaps, so friction of the retaining ring surfaces and the groove surface is possible in the case of strong vibrations, that may cause the ignition of the joint elements under the conditions of high temperature and presence in the medium of corrosive components.
Besides, such location of the retaining ring at a given diameter of the flange mounting surface and estimated length of the gasket peripheral part cause the necessity to make the length of elastic tabs shorter, that at other conditions being equal decreases their compliance required for the compensation of the joint gap providing the given level of tightness.
SUMMARY OF THE INVENTION
The object of the present invention to provide improvement of the quality and reliability of a construction in which a retaining releasing ring is mounted above the gasket from the fixing annular projection side, and consists in the following:
reduction of the joint overall dimensions by using the place released due to the absence of a shoulder for the retaining ring, that allows to make a gasket sealing surface to have a smaller diameter;
reliability improvement due to accomodation of the place of friction of the flange and retaining ring surfaces outside the component flow path and due to reducing the possible joint gap by increasing its stiffness associated with reducing the diameter of the flanges;
increase of the device sealing ability by providing a possibility to select an optimum length for the gasket elastic tabs.
For solving the object stated and achieving the technical result, a detachable stationary sealing device comprising:
flanges mounted on a pipeline, the first of which is made with a tapered surface and with an outer cylinder surface, and the second of which is made with a concave surface facing said tapered surface of the first flange;
a gasket located between said flanges, one part of the surface of which has a convex form and is conjugated with the concave surface of the second flange, and another part of the surface of which has a tapered form and is conjugated with the tapered surface of said first flange, the gasket end facing the pipeline axis being provided with a U-shaped groove, and the opposite end of the gasket being provided with an annular projection, the inner surface of which is placed on the outer cylinder surface of said first flange;
the retaining releasing ring intended for fixing the gasket, that has a C-shaped cross-section and is placed in the groove made on the mounting cylinder surface of said first flange, and the annular projection of said gasket is provided with a transversal external projection that is mounted inside said retaining releasing ring.
Additional embodiments of the device are possible, in which it is advisable that:
the transversal external projection of the gasket annular projection is made with a tapered outer surface, and the larger base of the tapered surface is mounted with possibility of its straddling by the &Ggr;-shaped part of the C-shaped retaining releasing ring, that is located above the annular projection of the gasket;
the gasket part thickness near the base of U-shaped groove is less than the thickness of the gasket part having tapered and convex surfaces with a possibility to put a gasket into the elastic tabs form in its longitudinal section;
the ends of elastic tabs are provided with the projections of toroidal shape;
the gasket is provided with by-pass holes located above the U-shaped groove made in the gasket part of less thickness;
the angle of the gasket tapered surface generatrix is selected to be equal to or larger than the angle of the flange tapered surface generatrix;
the radius of curvature of the gasket convex surface is selected to be equal to or less than the radius of curvature of the second flange concave surface;
bolts are used additionally for connecting the flanges above the outer surfaces of the retaining releasing ring and the gasket.
REFERENCES:
patent: 3520541 (1970-07-01), Rohani
patent: 4279425 (1981-07-01), Beacom
patent: 4648632 (1987-03-01), Hagner
Gromyko Boris Mikhailovich
Matveev Evgeny Mikhailovich
Mikhalev Igor Alexandrovich
Mitjukov Jury Vasilievich
Cherskov & Flaynik
Knight Anthony
Otkrytoe Aktsionernoe Obschestvo "Nauchno-Proizvodstvennoe Obied
Rodgers Matthew E.
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