Patent ID: 8201830
Filing Date: 2012-06-19
Classification: F16J

Abstract:
1. Airtight magnetic seal having a plurality of ring-type elements for direct installation between a stationary casing and a rotatable shaft, for sealing between an internal enclosure and an external enclosure, the seal comprising an inner section and an outer section concentric thereto, said inner and outer sections being engaged and squared with each other to create a permanent contact-seal inside the seal, in combination with labyrinth-seals, one at each axial planar end of the seal, and radial drains from inside the seal to the internal enclosure and to the external enclosure, wherein the seal keeps contamination in the external enclosure while keeping a lubricant oil in the internal enclosure, wherein: A. the outer section includes three stationary ring elements: a housing which grabs the stationary casing, a primary seal with a first sequence of magnetic bodies, and a collar with a second sequence of magnetic bodies, which mirrors the first sequence of magnetic bodies; the three stationary elements being aligned within the housing up to a metallic elastic ring by action of an anti-rotational element, and wherein: B. the inner section includes three rotary ring elements: a central head inside the seal, a sleeve with blocking rings which abuts the shaft, and a baffle which abuts the outer section; the three rotary elements rotating together while remaining engaged and squared to the outer section by a locking ring and blocking rings;