Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1989-03-29
1991-01-15
Shoap, Allan N.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 27, 277 28, 277 58, 277 59, 440 83, 440112, F16K 4100, B63H 2336
Patent
active
049848119
ABSTRACT:
A pressure control system for stern tube seals includes at least two resilient radial lip-type seal rings held so as to surround a propeller shaft linear. The closest seal ring lip to the propeller is arranged to face outboard and the other adjacent seal rings' lips are arranged to face suitable directions so as to form annular chambers. The aft annular chamber located most closely to the propeller serves as a chamber having a fixed differencial pressure higher than the seawater pressure. The closest seal ring to the propeller is lifted, thereby allowing air to be bled into seawater and preventing the ingress thereof. A regulator unit which is capable of instantly ascertaining changes in the hull's draft is provided in an air-supplying mechanism communicating with the aft annular chamber, so as to maintain the air pressure therein higher than the seawater pressure by a constant differential pressure. A pressurized oil-circulating mechanism is adapted to communicate with an adjacent annular chamber to the aft annular chamber, i.e., an oil chamber, and to fill the adjacent annular chamber with fluid for maintaining a fixed differential pressure in response to the air pressure within the aft annular chamber, thereby preventing the leakage of lubricating oil contained in the stern tube to outboard the ship.
REFERENCES:
patent: 3291491 (1966-12-01), Smith
patent: 3631834 (1972-01-01), Gardner
patent: 3653350 (1972-04-01), Koons et al.
patent: 3740058 (1973-01-01), Gardner et al.
patent: 3902726 (1975-09-01), Hisadu
patent: 3934952 (1976-01-01), Gardner
patent: 4085941 (1978-04-01), Wilkinson et al.
patent: 4128248 (1978-12-01), Kabelitz et al.
patent: 4168070 (1979-09-01), Tsuchihashi et al.
patent: 4174672 (1979-11-01), Cox
patent: 4189156 (1980-02-01), Geary, Jr. et al.
patent: 4284280 (1981-08-01), Bertram et al.
patent: 4448425 (1984-05-01), von Bergen
patent: 4460181 (1984-07-01), Araoka
patent: 4469335 (1984-09-01), Moore
patent: 4482158 (1984-11-01), Ishitani et al.
patent: 4482159 (1984-11-01), Ishitani et al.
patent: 4534569 (1985-08-01), Ishitani et al.
patent: 4565378 (1986-01-01), Wehrfritz et al.
patent: 4606652 (1986-08-01), Swearingen
patent: 4632403 (1986-12-01), Ishitani et al.
patent: 4865075 (1989-09-01), Murakami
Kuwabara Tsuneo
Miyazaki Jingo
Cummings Scott
Dover Japan, Inc.
Shoap Allan N.
LandOfFree
Pressure control system for stern tube seals does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressure control system for stern tube seals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure control system for stern tube seals will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-50880