SEALING MEMBER FOR SEALING MAGNETIC FLUID

• Main Author: ISHIKAWA, RYUHEI
• Format: Patent
• Language: English; Japanese
• Published: 05.10.1989
• Edition: 4
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; CYLINDERS; ELECTRICITY; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; INDUCTANCES; LIGHTING; MAGNETS; MECHANICAL ENGINEERING; PISTONS; SEALINGS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; THERMAL INSULATION IN GENERAL; TRANSFORMERS; WEAPONS

A sealing member for sealing magnetic fields according to the present invention is a sealing member (1) arranged so as to surround a periphery of a working member (5) such as shaft. The sealing member (1) comprises an annular magnet (2) and an annular pole piece (3), an electrically conductive magnetic fluid (6) being provided between the sealing member (1) and the working member (5) to construct an electrically conductive magnetic fluid-sealing member. And, an inner circumferential surface of the annular magnet (2) is coated with an electrically conductive non magnetic film (4) continuing to the annular pole piece (3) to down-size the sealing member (1) and reduce an electrical resistance. Joint d'étanchéité annulaire (1) destiné à entourer la périphérie d'un organe de travail (5), tel un arbre. Le joint d'étanchéité (1) comprend un aimant annulaire (2) et une pièce polaire annulaire (3), un fluide magnétique électroconducteur (6) étant intercalé entre le joint d'étanchéité (1) et l'organe de travail (5) pour former un joint d'étanchéité pour fluide magnétique électroconducteur. Une surface circonférentielle interne de l'aimant annulaire (2) est recouverte d'un film non magnétique électroconducteur (4) continu jusqu'à la pièce polaire annulaire (3), de manière à réduire la taille du joint d'étanchéité (1) et la résistance électrique.