F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
277/13
F16J 15/42 (2006.01)
Patent
CA 1173872
ABSTRACT A plural fluid magnetic/centrifugal-fluid seal is provided for hermetically sealing the space between a rotated shaft member and a close fitting spaced-apart stationary housing wherein the housing and the shaft are shaped to provide magnetic pole-like close clearance gap regions between their opposed surfaces. A high viscosity ferromagnetic fluid normally is disposed in the magnetic gap region with the rotating shaft member at rest and at low rotational speeds. A permanent magnet or electromagnet is provided which forms a closed magnetic circuit through the magnetic gap region with the high viscosity ferromagnetic fluid. A circumferentially arranged centrifugal seal forming region is radially disposed outward from the magnetic gap region and is located between the ro- tatable shaft and the stationary housing member. A low viscosity centirfugal sealing fluid is disposed in the centrifugal seal forming region and is centrifugally thrown outwardly during high speed rotation of the rotating shaft member to form a centrifugal hermetic seal between the rotating shaft member and the housing at high rotational speeds of the rotating member. The seal is designed to pro- vide a reservoir for the ferromagnetic sealing fluid in a space intermediate the rotating shaft member and the stationary housing member for collecting the ferromagnetic fluid during high speed rotation of the rotating shaft so as to keep the two different viscosity sealing fluids isolated one from the other is separate but communicating spaces. In certain designs it is possible to use the lubricating oil of an apparatus or machine as the low viscosity centrifugal sealing fluid by providing fluid passageways between the machine lubricating oil cooling and supply system and the centrifugal seal region whereby the centrifugal seal serves as an auxillary lubricating oil pump for pumping the lubricating oil from the centrifugal seal region to a lubricating oil reservoir that comprises a part of the lubricating oil supply system. Such an arrangement can be included in combination with a conventional pressurized labyrinth seal positioned on the rotating member adjacent the plural fluid magnetic/ centrifugal seal in a location between the plural fluid magnetic/centrifugal seal and a hostile high pressure atmospher
384234
Heshmat Hooshang
Johnson & Hicks
LandOfFree
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