Magnetic fluid sealing device, magnetic fluid sealed bearing and polar plate manufacturing method

• Main Authors: ABE YUTARO, OHARA TAKESHIGE
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2019
• Subjects: AGRICULTURE; ANIMAL HUSBANDRY; BEARINGS; BLASTING; CARE OF BIRDS, FISHES, INSECTS; CYLINDERS; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FISHING; FLEXIBLE SHAFTS; FORESTRY; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HUMAN NECESSITIES; HUNTING; LIGHTING; MECHANICAL ENGINEERING; NEW BREEDS OF ANIMALS; PISTONS; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SEALINGS; SHAFTS; THERMAL INSULATION IN GENERAL; TRAPPING; WEAPONS

The invention provides a magnetic fluid sealing device in which a magnetic fluid retained between a polar plate and a drive portion can be effectively prevented from spilling, so as to retain waterproofness for a long period. The magnetic fluid sealing device includes a ring-shaped polar plate (32) encircling a drive portion (21a) and retaining a magnet (31); and a magnetic fluid (35) retained ina gap (G) between the drive portion and the polar plate by a magnetic force of the magnet (31). The device is characterized in that the polar plate (32) has a spill preventing portion (40) provided thereon, the spill preventing portion (40) having a projecting wall (41) that is disposed distant from an end surface of the polar plate retaining the magnetic fluid, so as to prevent spill of the magnetic fluid. 本发明提供一种可有效地防止保持在极板和驱动部之间的磁性流体流出，可长期维持防水性的磁性流体密封装置。具体而言，本发明的磁性流体密封装置具有：环状的极板(32)，围绕驱动部(21a)而配设，以便保持磁铁(31)；及磁性流体(35)，通过磁铁(31)的磁力而被保持在驱动部和极板之间的间隙(G)中。而且其特征在于，在极板(32)上设置有具有突出壁(41)的流出防止部(40)，所述突出壁(41)从保持磁性流体的极板的端面离开，并具备