Seal apparatus for a ship propeller shaft and method of making the apparatus
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United States of America Patent
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Jan 12, 2016
Grant Date -
Nov 27, 2014
app pub date -
May 22, 2014
filing date -
May 22, 2013
priority date (Note) -
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Abstract
A seal apparatus, for sealing around a rotating shaft such as a propeller shaft of a watercraft between the exterior water and an interior lubricant space, includes a multiple seal arrangement with plural seal rings forming seal chambers therebetween, and plural fluid medium lines supplying and/or returning a respective fluid medium to a respective seal chamber. A section of a first medium line is formed as an axial passage through a housing of the apparatus, and a section of a second medium line is formed by a pipe arranged within the axial passage in the housing. A method of making such an apparatus especially by retrofitting an existing seal arrangement involves inserting a pipe into an axial passage in the housing in order to establish two medium lines through the housing where there was previously only one medium line.
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