Pipe joints or couplings – With fluid pressure seal – Flexible lip
Patent
1987-12-01
1989-10-31
Arola, Dave W.
Pipe joints or couplings
With fluid pressure seal
Flexible lip
285212, 285351, 285917, 277236, F16L 1706
Patent
active
048772720
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a metal static seal with elastic restitution, as well as to assemblies by screwed connection incorporating such a seal.
The invention concerns more particularly a metal static seal comprising an annular part forming a bead and first and second wings connected laterally to the bead and extending transversely with respect to the axis of the seal, the seal presenting, in axial half-section, the shape of a V lying on its side, the tapered surfaces of the branches of the V being slightly inclined with respect to the planar surfaces of the bead, perpendicular to the axis of the seal, to which they are attached.
Various types of static seals intended to ensure a seal in fixed assemblies are known. The static seals may thus for example be flat, toric, four-lobed, and may in particular be metallic, metalloplastic or of synthetic rubber.
The different static seals known comply with certain operational conditions but are not entirely satisfactory as regards the manufacturing costs, the mechanical qualities, nor the performances particularly from the standpoint of resistance to severe operational conditions.
The static seals of the elastomer type are relatively inexpensive, but have a relatively limited life duration.
The known metal static seals present better characteristics from the standpoint of performances of life duration, but are generally more expensive to manufacture.
It has already been proposed to produce metal static seals comprising wings attached to a bead and defining a V section. Such seals are for example described in French Pat. Nos. 1 356 218, 1 537 146 and 1 563 153. However, such seals have not been able to be used conveniently under difficult conditions of use, for example under high pressure or in the presence of considerable vibrations. This is due in particular to the fact that the different known seals of this type present only one zone of seal at the end of the lips, the bead presenting only a geometrical function of positioning of the seal and not being able to be compressed in significant manner. Moreover, the known seals of this type present concentrations of considerable stresses at the level of the grooves made between the bead and the branches of the V or on the bead itself, this rendering these seals unsuitable for use under severe conditions of operation where the mechanical forces are considerable.
The invention aims at overcoming the drawbacks set forth hereinabove and at producing a static seal which is both relatively inexpensive and presents excellent qualities from the standpoints of mechanical strength and resistance to aggressions under severe conditions of temperature, pressure, vibrations and chemical attack.
It is a further object of the invention to produce a static seal which is easy to manufacture and to instal within an assembly by screwed connection.
Yet another object of the invention is to produce a static seal presenting minimum dimensions and able to be associated with other types of conventional seals.
These objects are attained thanks to a metal static joint of the type defined in the beginning of the specification, characterized in that the annular part forming bead is semi-rigid, the first and second wings are connected laterally to the bead in gradual and regular manner forming concave surfaces with large radius of curvature, the branches of the V constituting the wings present an elasticity such that, by flexure of said tapered surfaces of the branches of the V, the ends of these surfaces may ensure with the planar surfaces of the slightly flexible semi-rigid bead, to which they are attached, two sealing regions.
The inclination of the tapered surfaces of the branches of the V with respect to the planar surfaces of the bead to which they are attached is advantageously of the order of 7.degree. to 15.degree. and preferably close to 10.degree..
According to a first embodiment in which the static seal presents an outer diameter less than or equal to about 14 mm, the bead constitutes an inner annular part and the branches of the
REFERENCES:
patent: 2852281 (1958-09-01), Ellis
patent: 3058750 (1962-10-01), Taylor
patent: 3142498 (1964-07-01), Press
patent: 3376053 (1968-04-01), Novakovich et al.
patent: 3759552 (1973-09-01), Levinsohn et al.
patent: 4597596 (1986-07-01), Tuzer
Chevallier Marc
Froger Guy
Arola Dave W.
Societe Anonyme: Societe Europeene De Propulsion
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