Sealing device for a rotating shaft of a ship propeller shaft

US5137116A · kind A · utility

Assignee

• Blohm & Voss GmbH · DE

Inventors

• Ernst-Peter Von Bergen · Büdelsdorf, DE
• Gunter Pietsch · Hamburg, DE

Key dates

• Filing date: May 30, 1991
• Grant date: Aug 11, 1992
• Expiry date: May 30, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S277/93
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A lubrication system for a rotatable propeller shaft of a ship. The system includes a seal for sealing lubricant adjacent the shaft and at least one annular chamber defining a hose-shaped inflatable body. A ring line supplies a fluid heat transfer medium, such as air, to the at least one annular chamber. The heat transfer medium is heated by a heat source. The heat transfer medium may also act as a pressure medium to inflate the inflatable body. The heat transfer medium can be circulated so that when the propeller shaft is stationary in an extremely cold liquid medium, such as icy sea water, the inflatable body is inflated by the heat transfer medium so that the inflatable body expands to within a major portion of the at least one annular chamber while, simultaneously, heating lubricant in the remaining portion of the annular chamber. Such heating causes the lubricant viscosity to approximately equal the viscosity of the lubricant when the propeller shaft rotates and the lubricant is not heated. During rotation of the propeller shaft, the inflatable body is deflated out of the annular chamber.