Safety device for seal systems for propeller shafts on ships

Details Safety device for seal systems for propeller shafts on ships Safety device for seal systems for propeller shafts on ships

1995-09-25

1997-07-01

Sotelo, Jesus D.

Marine propulsion

Inboard engine mount

Having thru-hull sealing means

416174, 277 3, B63H 2336

Patent

active

056430264

ABSTRACT:
A safety device on an aft seal system equipped with at least two gaskets for a ship's propeller shaft, which propeller shaft is sealed with respect to the outside water and with respect to a lubricant chamber, and on which a ring-shaped chamber is reserved between each two gaskets, to which chamber are connected a feed line for compressed air and a discharge channel which can be emptied by means of a solenoid valve which opens and closes periodically. The pressure in the ring-shaped chamber is kept always slightly lower than the respective outside water pressure and the lubricant pressure by means of a pressure regulation mechanism. In the feed line to the ring-shaped chamber, downstream of the pressure regulation mechanism there is a solenoid valve, and downstream of that there is an airtight container with a float switch, whereby when the container is full of fluid due to a clogging of the discharge channel, the solenoid valve closes and thereby protects the pressure regulation mechanism and the other units against flooding.

REFERENCES:
patent: 3625523 (1971-12-01), Gardner
patent: 3934952 (1976-01-01), Gardner
patent: 4395141 (1983-07-01), Pietsch et al.
patent: 4984811 (1991-01-01), Kuwabara et al.

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