Other

Isomag Corporation

Stephen M Dawson

Gary D Anderson

Michael L Deweese

A magnetic rotary seal with improved drain back is provided, comprising a housing adapted to matingly engage a fixed opening, wherein the housing includes an annular retaining member. A stator is positioned within the housing, wherein the stator includes a first resilient sealing member adapted to sealingly contact the housing, and a first frictional sealing face. A rotor is positioned between the annular retaining member of the housing and the stator, wherein the rotor includes a second resilient sealing member adapted to sealingly contact a shaft, and a second frictional sealing face. Magnets are operatively positioned between the stator and the rotor urging engagement of the first frictional sealing face of the stator with the second frictional sealing face of the rotor. The housing further includes an annular channel for receiving lubricating fluids from within the seal, and a drain port in fluidic communication with the channel. The annular retaining member includes one or more expulsion ports formed therein to permit lubricating fluids to move away from the rotor and into the channel during operation of the seal.

Magnetic rotary seal with improved drain back

The invention herein is a seal to seal a rotating shaft to housing. The seal has a stator and a rotor, magnetically and mechanically coupled. The mechanical couple is provided through an interlocking annular groove provided on one component and a flange face on the other component. The mechanical couple allows the two components to become interconnected once a predetermined range of free movement of the rotor is exceeded. The stator and rotor are also mechanically coupled through a plurality of magnets positioned on either the stator or rotor. After the predetermined range is exceeded, the rotor slips along the shaft while the stator remains fixed, maintaining a seal in during axial movement of the rotating shaft.

Magnetic seal

A magnetic rotary seal is provided for sealing a shaft to a housing, comprising a rotary seal head having a first annular surface; a first O-ring disposed between the rotary seal head and the shaft for sealably coupling the rotary seal head to the shaft; a housing adaptor disposed within the housing; a magnetic stationary ring disposed within the housing adaptor, wherein the stationary ring includes a second annular surface; a second O-ring disposed between the housing adaptor and the stationary ring for sealably coupling the stationary ring to the housing adaptor; and a plurality of magnets disposed within the rotary seal head for urging the first annular surface against the second annular surface. The second O-ring is held within opposing circumferential grooves formed in the housing adaptor and the stationary ring, which prevents the stationary ring from leaving the housing adaptor. The grooves are formed into the housing adaptor and the stationary ring such that a gap is created between the housing adaptor and the bottom surface of the stationary ring. During operation, the resiliency of the second O-ring and the presence of the gap allow the stationary ring to dynamically respond to any misalignment of the seal head while the opposing grooves serve to prevent the stationary ring from moving axially within the housing adaptor.

Growing community of inventors

Baton Rouge, LA, United States of America

Stephen M Dawson