Patent ID: 6830248
Filing Date: 2004-12-14
Classification: F16J,G02B

Abstract:
A magnetic fluid sealer that is provided in a gap between two members mounted so as to be relatively movable with respect to each other, said magnetic fluid sealer comprising:a magnetic circuit forming means which includes a magnetic force producing means for producing magnetic force, and forms a magnetic circuit that passes through said gap; and a magnetic fluid that is magnetically retained by magnetic flux passing through said gap of the magnetic circuit formed by the magnetic circuit forming means, which contacts with one of the two members to thereby seal said gap; a sleeve mounted to the other one of the two members and in which a fitting groove is formed at a position opposing the one of said members; and said magnetic circuit forming means being supported by levitation from the one of said members by magnetic levitation force that said magnetic fluid imparts and being arranged in the fitting groove of the sleeve so as to be movable in a vertical direction with respect to the one of said members, said magnetic fluid being retained in said sleeve and said magnetic circuit forming means being disposed into said fitting groove in said sleeve prior to mounting the magnetic fluid sealer between the two members.