Magnetic fluid seal apparatus

Details Magnetic fluid seal apparatus Magnetic fluid seal apparatus

1992-02-12

1992-11-24

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, 384133, F16J 1540

Patent

active

051657015

ABSTRACT:
A magnetic fluid seal apparatus adapted to prevent a magnetic fluid from being displaced along a shaft or housing during linear motion of the shaft. In the apparatus of the bore mounted type, a pole piece is hermetically fixed within a bore of the housing, while an associated inner ring is fitted over the shaft so as to form an annular magnetic gap in which the magnetic fluid is magnetically retained. The inner ring has an axial length smaller than that of the pole piece. Thus, a portion of the magnetic fluid is retained along the outer face of the inner ring, while the remainder of the fluid is retained along the inner face of the pole piece to form a film of magnetic fluid. The pole piece has an axial length equal to or greater than the travel of linear motion of the shaft so that the portion of magnetic fluid retained along the inner ring is in continuous, integrated fluid-to-fluid engagement with the film of magnetic fluid throughout the travel of the shaft. Various other embodiments, including a magnetic fluid seal apparatus of the shaft mounted type, are also disclosed.

REFERENCES:
patent: 4445696 (1984-05-01), Raj et al.
patent: 4526380 (1985-07-01), Raj et al.
patent: 4527802 (1985-07-01), Wilcock et al.
patent: 4681328 (1987-07-01), Ritter et al.
patent: 4842426 (1989-06-01), Furumura et al.
patent: 5047392 (1991-09-01), Hed
patent: 5108198 (1992-04-01), Nii et al.

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