Magnetic fluid shaft-sealing device

Details Magnetic fluid shaft-sealing device Magnetic fluid shaft-sealing device

2009-03-18

2011-11-01

Beach, Thomas (Department: 3674)

Seal for a joint or juncture

Seal between relatively movable parts

Close proximity seal

C277S370000, C277S371000

Reexamination Certificate

active

08047549

ABSTRACT:
A magnetic fluid shaft-sealing device includes a seal cover (3) attached to a pump housing (1) in which a rotary shaft (2) is mounted. The seal cover (3) includes: a shaft hole (33) extending along an axis, an annular recess (36) formed in an outer end face (32) around the shaft hole (33), and an inner ring portion (363) defined between the annular recess (36) and the shaft hole (33). A collar (4) is mounted around the rotary shaft (2) to rotate therewith and includes a first end (41) received in the annular recess (36) and around the inner ring portion (363). A magnet (6) and two pole pieces (5) are mounted between an outer periphery (364) of the inner ring portion (363) and the first end (41) of the collar (4). A gap (71) is formed between an inner periphery (440) of the first end (41) of the collar (4) and outer peripheries of the pole pieces (5), and a magnetic liquid (7) is filled in the gap (71) to provide a liquid seal therebetween.

REFERENCES:
patent: 3620584 (1971-11-01), Rosensweig
patent: 4054293 (1977-10-01), Hoeg et al.
patent: 4995622 (1991-02-01), Fuse
patent: 5951020 (1999-09-01), Orlowski
patent: 6322079 (2001-11-01), Mullaney, III
patent: 6494458 (2002-12-01), Uth
patent: 6722657 (2004-04-01), Hood et al.

Affiliated with

Also associated with

Rating

Magnetic fluid shaft-sealing device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic fluid shaft-sealing device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic fluid shaft-sealing device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4256694