Seal for a joint or juncture – Seal between relatively movable parts – Circumferential contact seal for other than piston
Patent
1997-09-15
1999-07-27
Oen, William
Seal for a joint or juncture
Seal between relatively movable parts
Circumferential contact seal for other than piston
B65P 5300, F16J 900, F16K 4100
Patent
active
059277238
DESCRIPTION:
BRIEF SUMMARY
The present invention pertains to a seal configuration for a flat flanged joint according to the preamble of claim 1.
Such a seal configuration can be seen from DE 41 39 453 A1. In this case, the two seal reception surfaces of the base part have annular teeth. On either side of the base part, the radially innermost tooth and the radially outermost tooth have a higher design than the intermediate teeth. Upon insertion of the seal, which consists of a conveniently metallic base part and the two seal bearings, this results in confinement of the seal bearings within a chamber, i.e. the seal bearings are embedded between the respective inner and outer teeth, and the seal bearing cannot creep inward or outward beyond the inner or outer tooth.
In the known prior art, the annular teeth in the region of the seal reception surfaces are produced by turning on a lathe. This requires special tools and correspondingly long processing times.
Seal configurations having annular teeth are fundamentally distinct from metal seal configurations with force shunt seals in which the desired surface pressure at the sealing surfaces is reduced by force shunt. However, this also reduces the sealing performance. Although the generic seal configurations with annular teeth do not exhibit this drawback, they always require fastening with torque-controlled wrenches.
The seal having annular teeth known from DE 41 39 453 A1 has proven very successful, but involves a relatively cumbersome preparation due to the annular teeth present in the region of the seal reception surfaces. Further, it has been the general opinion that the teeth on the seal reception surfaces were indispensable for achieving a good leakage performance.
It has been the object of the invention to provide an improved seal configuration for flat flanged joints with annular teeth which can be prepared with less costs while exhibiting at least the same leakage performance, blow-off safety and component safety as the configuration according to the known prior art. At the same time, the mounting height is to be decreased and the risk of notch stress cracking and stress corrosion cracking reduced.
This object is achieved by the features of a seal configuration for a flat flanged joint with a flat base part (1) having seal-reception services (2) on either side, each with an inner annular tooth and an outer annular tooth which bound either seal- reception surface on its radial inside and outside, respectively, and having two annular seal bearings (3) which are respectively adhered to the seal-reception services and which, in a mounted condition, are embedded and confined in a chamber between the annular teeth, characterized in that each seal-reception surface has an even design.
Due to the fact that every seal reception surface has an even design in the configuration according to the invention, the tedious turning of the annular teeth in the region of the seal reception surfaces is omitted.
Surprisingly, the omission of annular teeth in this region does not result in a more unfavorable leakage performance. Rather, due to the absence of those annular teeth, the seal bearing can evenly spread throughout the seal reception surface within the chamber without being hindered by the teeth. In an ideal mounting of the seal, as may occur at low pressure, the even flange surfaces remain practically in parallel. In contrast, high screw fastening torques result in the flange surfaces being no longer exactly in parallel, but rather closer together on the radial outside than they are on the radial inside. This effect also causes a flowing of the seal bearings. It is necessary that just in the cases of non-ideal mounting which actually occur in practice, the seal bearings be capable of flowing free within the respective chamber.
A uniform surface pressure throughout the region of the seal reception surface is achieved thereby. This is not sufficiently possible in the case of annular teeth being present in the region of the seal reception surfaces since the teeth prevent the seal bearing from flo
REFERENCES:
patent: 3698725 (1972-10-01), Klabunde
patent: 4020690 (1977-05-01), Samuels et al.
patent: 5222425 (1993-06-01), Davies
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