초록 ▼

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

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 of a propeller shaft, piping communicating with one of a liquid reservoir tank arranged so that a liquid pressure within the stern annular space is lower than a draft pressure on shaft center line is provided in a stern annular space defined by a first seal ring arranged on a stern side and a second seal ring adjacent to the first seal ring, and a feeding device for forcibly feeding the liquid in the stern annular space to the outside of a vessel having a higher pressure at a time of shaft rotation is provided on a sliding contact surface of the first seal ring and/or a sliding contact surface of the liner where the first seal ring and the liner are slidably brought into contact with each other.

대표청구항 ▼

1. A stern tube sealing apparatus comprising a plurality of seal rings slidably brought into contact with a liner of a propeller shaft, wherein in a stern annular space defined by a first seal ring arranged on a stern side and a second seal ring adjacent to the first seal ring is provided piping com

1. A stern tube sealing apparatus comprising a plurality of seal rings slidably brought into contact with a liner of a propeller shaft, wherein in a stern annular space defined by a first seal ring arranged on a stern side and a second seal ring adjacent to the first seal ring is provided piping communicating with one of a liquid reservoir tank arranged so that a liquid pressure within said stern annular space is lower than draft pressure on shaft center line and a pressure control valve connected to a liquid supply source, and feeding means for forcibly feeding the liquid in the stern annular space to an outside of a vessel having a pressure higher than that in the stern annular space at a time of shaft rotation is provided on at least one of a sliding contact surface of the first seal ring and an opposing sliding contact surface with which said first seal ring is slidably brought into contact.