Stern tube seal with a pressure control system to adjust to the

Details Stern tube seal with a pressure control system to adjust to the Stern tube seal with a pressure control system to adjust to the

1995-09-25

1997-11-04

Swinehart, Edwin L.

Marine propulsion

Inboard engine mount

Having thru-hull sealing means

440 83, 277 3, 277 59, B63H 2336

Patent

active

056832788

ABSTRACT:
A system to adjust to the changing draft of ocean-going ships on the aft seal system equipped with several outwardly-directed gaskets and one inwardly-directed gasket, in which, between each two outwardly-directed gaskets a ring-shaped chamber is reserved, to which a feed line for compressed air is connected. Integrated into the feed line is a pressure control mechanism and a discharge channel which can periodically empty into the interior of the ship (bilge), whereby the pressure in the ring-shaped chamber is always maintained slightly below the outside water pressure. The system is characterized by the fact that an electronic draft measurement system is located on the ship's hull to supply electric signals which correspond to the current draft, which signals actuate the pressure control mechanism. In addition, for the lubrication system, there are two pressure control mechanisms pressurized by compressed air, and which are also actuated by the signals of the draft measurement system, whereby these pressure control mechanisms are each connected to the gas cushion of their own externally airtight containers which are pressurized with lubricant and in which a specified level is maintained, whereby the one container empties into a ring-shaped chamber between the inwardly-directed gasket and the outwardly-directed gasket, and the other container empties into the lubricant chamber.

REFERENCES:
patent: 4984811 (1991-01-01), Kuwabara et al.

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