Single pole piece multiple-stage ferrofluid seal apparatus

Details Single pole piece multiple-stage ferrofluid seal apparatus Single pole piece multiple-stage ferrofluid seal apparatus

1984-01-27

1985-07-02

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, F16J 1540

Patent

active

045263809

ABSTRACT:
A single pole piece multiple-stage ferrofluid seal apparatus which comprises a non-permeable housing, an annular, axially polarized permanent magnet and a single pole piece on one side of the axially polarized permanent magnet and a magnetically permeable bearing assembly, such as a ball bearing assembly on the opposite side of the permanent magnet and a shaft extending through the housing with one end of the pole piece extending into a close, non-contacting relationship with the surface of the shaft, so as to form at the one end of the pole piece or on the surface of the shaft a plurality of separately spaced apart knife edges to define a plurality of spaced apart radial gaps and ferrofluid disposed in the radial gaps to define a plurality of spaced apart ferrofluid O-ring seals about the shaft surface, with the magnetic flux circuit passing between the permanent magnet, the pole piece, the radial gaps, the shaft, and the bearing assembly.

REFERENCES:
patent: 4407518 (1983-10-01), Moskowitz et al.

Affiliated with

Also associated with

Rating

Single pole piece multiple-stage ferrofluid seal apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Single pole piece multiple-stage ferrofluid seal apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single pole piece multiple-stage ferrofluid seal apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-377645