Seal

US5058905A · kind A · utility

Inventors

• Josef Nosowicz · Geretsried, DE
• Rudolf Kollinger · Barth, DE

Key dates

• Filing date: Oct 5, 1989
• Grant date: Oct 22, 1991
• Expiry date: Oct 5, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S277/929
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The sliding face (22) of a gas lubricated slide ring seal has a slide ring (20) which is displaceable in the axial direction at a wall (4) to be sealed and lies against the sliding face (21) of a mating ring (10) which is fastened on an intermediate sleeve (10) so as to be immovable and sealing. The intermediate sleeve is rotatably mounted by roller bearings (16) on the shaft (2) to be sealed and is sealed against the shaft by a dynamic sealing device (15). Between the shaft (2) and the intermediate sleeve (10) a coupling (17) is provided which couples the shaft with the intermediate sleeve (10) during rotation of the shaft in its regular direction of rotation (1'), thus driving the mating ring (19) and pumping gas from the chamber (6) to be sealed through conveying grooves (24) disposed in its sliding face (21) into the area between the two sliding faces 21, 22). In the opposite direction of rotation (1"), the coupling (17) decouples for preventing the sliding faces (21, 22), from performing a relative movement opposite to that during rotation in the regular direction (1').