MAGNETIC FLUID SHAFT SEAL Russian patent published in 2015 - IPC F16J15/00 

FIELD: machine building.

SUBSTANCE: magnetic fluid shaft seal contains casing out of non-magnetic material, inside it a ring magnetic system is located, it comprises a ring permanent magnet, two pole attachments having ring magnetic conducting bases, that on surface looking on the shaft have brushes, and magnetic liquid in the clearance between the shaft ands ends of the brush bristles. The ring permanent magnet is installed between two pole attachments. To its internal and external sides two ring non-magnetic adjoin. The ring permanent magnet by its north pole adjoins to the side of one pole attachment, and by the south pole - to the side of the another pole attachment, and between sides of the external non-magnetic sleeve and casing a ring filling tank is made, it is connected with the gap cavity by the longitudinal channels made in the monolith pole attachments. Non-magnetic coating is applied to the internal surface of the longitudinal channels.

EFFECT: invention extends functional possibilities of the magnetic0liquid seal and increases the kept pressure difference.

2 cl, 2 dwg