Self-activating ferrofluid seals

Details Self-activating ferrofluid seals Self-activating ferrofluid seals

F - Mech Eng,Light,Heat,Weapons

16

J

277/49

F16J 15/16 (2006.01) F16J 15/43 (2006.01) G11B 19/20 (2006.01)

Patent

CA 1135744

ABSTRACT A self-activating seal is formed by inserting a mag- netically permeable shaft into a module which comprises: a magnet, two pole pieces and a magnetic fluid. The module is so constructed that the magnet and pole pieces form a cavity for storing the magnetic fluid until the shaft or similar element is inserted. Upon insertion of the shaft, the magne- tic field is altered and the flux path diverted to the small gaps separating the pole pieces and the shaft. The magnetic fluid is drawn to the gaps to form hermetic seals.

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