Magnetic fluid sealing device

Details Magnetic fluid sealing device Magnetic fluid sealing device

2011-05-31

2011-05-31

Pickard, Alison K (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Close proximity seal

Reexamination Certificate

active

07950672

ABSTRACT:
A magnet is embedded in an outer rotational shaft provided in a bearing hole of a case, and an outer magnetic circuit and an inner magnetic circuit are formed on the outer peripheral surface and inner peripheral surface of the outer rotational shaft, respectively. In a magnetic fluid seal device, magnetic fluid is filled in minute gaps coming in contact with the outer peripheral surface and inner peripheral surface of the outer rotational shaft, and the two rotational shafts can be strongly sealed by the magnetic circuits formed by a magnet. As a result, the rotational shafts can be rotated while supported in a non-contact style. In addition, the dimension can be reduced, and the number of parts can be reduced.

REFERENCES:
patent: 4293137 (1981-10-01), Ezekiel
patent: 4407508 (1983-10-01), Raj et al.
patent: 4526382 (1985-07-01), Raj et al.
patent: 4527805 (1985-07-01), Gowda et al.
patent: 4545587 (1985-10-01), Higgins
patent: 4575102 (1986-03-01), Raj et al.
patent: 4605233 (1986-08-01), Sato
patent: 4844138 (1989-07-01), Kokubu
patent: 5092611 (1992-03-01), Ehmsen et al.
patent: 5340122 (1994-08-01), Toboni et al.
patent: 5799951 (1998-09-01), Anderson et al.
patent: 6247701 (2001-06-01), Kitada et al.
patent: 7129609 (2006-10-01), Mikhalev et al.
patent: 7398974 (2008-07-01), Mikhalev et al.
patent: 2009/0115137 (2009-05-01), Shimazaki et al.
patent: 0 183 477 (1986-06-01), None
patent: 61-165072 (1986-07-01), None
patent: 62-20268 (1987-02-01), None
patent: 62-278377 (1987-12-01), None
patent: 3-48071 (1991-03-01), None
patent: 7-20469 (1995-04-01), None
patent: 10-220596 (1998-08-01), None
patent: WO-98/14726 (1998-04-01), None

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