Stern tube sealing apparatus

摘要

The invention provides a stern tube sealing apparatus which prevents an abrasion by cooling and lubricating a sliding contact surface of a first seal ring, prevents a foreign substance and a seawater from entering so as to further improve a durability of a seal ring and a liner, intends to make the sealing apparatus compact and reduce a cost by using no pressurizing apparatus, and has a high reliability of a seal system. In order to achieve the stern tube sealing apparatus, the structure is made such that the stern tube sealing apparatus is constituted by a plurality of seal rings slidably brought into contact with a liner (11) of a propeller shaft (10), piping (7) communicating with one of a liquid reservoir tank (6) arranged so that a liquid pressure within the stern annular space (4) is lower than a draft pressure on shaft center line is provided in a stern annular space (4) defined by a first seal ring (1) arranged on a stern side and a second seal ring (2) adjacent to the first seal ring, and a feeding device (16) for forcibly feeding the liquid in the stern annular space (4) to the outside of a vessel having a higher pressure at a time of shaft rotation is provided on a sliding contact surface (15) of the first seal ring and/or a sliding contact surface (17) of the liner where the first seal ring (1) and the liner (11) are slidably brought into contact with each other.