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Sealing device for rotating shafts, in particular stern tube seal for the propeller shafts of a ship, with a main seal and a backup seal, in which the main seal is designed as a rotating mechanical seal or as a lip seal, and the backup seal is designed as a gland seal, and the activation of the latt

Sealing device for rotating shafts, in particular stern tube seal for the propeller shafts of a ship, with a main seal and a backup seal, in which the main seal is designed as a rotating mechanical seal or as a lip seal, and the backup seal is designed as a gland seal, and the activation of the latter takes place by means of an expandable body, which can be pressurized with a hydraulic or pneumatic pressure medium, preferably as a function of the pressure of the medium to be sealed out.

대표청구항 ▼

A stern tube seal for a rotating propeller shaft of a ship, the propeller shaft having an axial direction, said stern tube seal comprising: a first seal for functioning as a main seal; and a backup seal, said backup seal being for use when said first seal fails, said backup seal comprising: compress

A stern tube seal for a rotating propeller shaft of a ship, the propeller shaft having an axial direction, said stern tube seal comprising: a first seal for functioning as a main seal; and a backup seal, said backup seal being for use when said first seal fails, said backup seal comprising: compressible sealing means for sealing out an outside medium from around the propeller shaft, the outside medium to be sealed out comprising outside water about the ship at a selected point, the outside water having a variable pressure; a gland member for moving in the axial direction for compressing and decompressing said compressible sealing means to vary sealing; a guide member for directing said gland member in the axial direction; an expandable body located between a portion of said gland member and a portion of said guide member, said expandable body for moving said gland member in the axial direction relative to said guide member for compressing and decompressing said compressible sealing means; a pressurized medium for acting upon said expandable body; a pressure control mechanism comprising: sensing means for sensing the pressure of said variable water pressure at said selected point; means for varying the pressure of said pressurized medium; and said pressured control mechanism for increasing and decreasing the pressurized medium directly in relation to at least the pressure of the outside water at said selected point and wherein a portion of said gland member telescopes into said guide member to form a piston-cylinder unit; and said expandable body is always completely contained within said piston-cylinder unit.