Nonbursting magnetic liquid seals for high vacuum applications

Details Nonbursting magnetic liquid seals for high vacuum applications Nonbursting magnetic liquid seals for high vacuum applications

1983-02-22

1984-05-01

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 1, 277135, F16J 1540

Patent

active

044456964

ABSTRACT:
A single-stage, ferrofluid magnetic seal apparatus and method which comprises: an annular, permanent-magnet ring element adapted to surround a shaft to be sealed, which shaft extends between first low-pressure and second high-pressure; first and second pole pieces in a magnetic-flux relationship with the permanent magnet, and having one and the other ends, the other end extending into a close, noncontacting relationship with the surface of the shaft, to define a radial gap therebetween; a plurality of stages formed in the radial gap under the other end of the second pole piece, which pole piece is placed toward the high-pressure side the environment, and the radial gap under the first pole piece, placed toward the low-pressure side of the environment, being shallow and generally less than about 2 mils; and ferrofluid in the radial gap under the other end of the second pole piece which forms a plurality of separate O-ring ferrofluid seals of defined pressure capacity, thereby providing a single-stage, ferrofluid magnetic seal apparatus and method, which seal apparatus has a reduced tendency to permit unpredictable air bursts, when installed about the rotary shaft between first and second pressure environments.

REFERENCES:
patent: 3848879 (1974-11-01), Hudgins
patent: 4357023 (1982-11-01), Yamamura

Affiliated with

Also associated with

Rating

Nonbursting magnetic liquid seals for high vacuum applications does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Nonbursting magnetic liquid seals for high vacuum applications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonbursting magnetic liquid seals for high vacuum applications will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2027695