Magnetic seal
AssigneeIsomag Corporation
InventorsStephen M. Dawson, Gary D. Anderson, Michael L. Deweese
Life of this patent
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Abstract
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.
Claims11
A device for sealing a rotatable shaft and a fixed housing, said device comprising an annular stator and an annular rotor, said stator having a seal means for forming a seal with said housing, said rotor having a seal means for forming a seal with said shaft, said rotor and said stator each having contact faces, said device having a means to mechanically couple said rotor to said stator so that said rotor moves axially independently of said stator for a predetermined range and once said predetermined range is exceeded, said rotor axial movement is coupled to said stator axial movement, and at least one magnet urging said contact faces together to form a seal when said stator and said rotor contact faces are in contact.
A device for sealing a rotatable shaft and a fixed housing, said device comprising an annular stator and an annular rotor, said stator having a seal means for forming a seal with said housing, said rotor having a seal means for forming a seal with said shaft, said rotor and said stator each having contact faces, said device having a means to mechanically couple said stator and said rotor to allow said rotor to axially slide along said shaft, and at least one magnet urging said contact faces together to form a seal when said stator and said rotor contact faces are in contact.
A device for sealing a rotatable shaft and a fixed housing, said device comprising a mechanically coupled stator and rotor, said rotor and said stator each having a contact face, said rotor being constructed substantially of a semi-flexible heat-resistant material, and at least one magnet positioned on said rotor urging said contact faces together to form a seal between said stator and said rotor when said contact faces are in contact.
A device for sealing a rotatable shaft and a fixed housing, said device comprising a stator and a rotor, said device having a means to mechanically couple said stator and said rotor, said rotor and said stator each having a contact face, at least one magnet for urging said contact faces together to form a seal between said stator and said rotor when said contact faces are in contact, said means to mechanically couple said stator and said rotor forming a labyrinth between said stator and said rotor.
A device for sealing a rotatable shaft and a fixed housing, said device comprising an annular stator and an annular rotor, said stator having a seal means for forming a seal with said housing, said rotor having a seal means for forming a seal with said shaft, said rotor and said stator each having contact faces, said device having a annular groove positioned on one of said stator or said rotor, and a flange positioned on the other of said stator or said rotor, said annular groove and said flange co-operating to mechanically couple said rotor to said stator so that said rotor moves axially independently of said stator for a predetermined range and once said predetermined range is exceeded, said rotor axial movement is coupled to said stator axial movement, and at least one magnet urging said contact faces together to form a seal between said stator and said rotor when said contact faces are in contact.
Dependencies are inferred from the claim text.