Patent ID: 7815196

Claim:
A magnetic seal assembly comprising: (a) an annular mounting flange that is bolted onto a nozzle flange fitted on a reactor vessel, (b) a static shroud, (c) a stool assembly that comprises a shell, an upper stool flange, and a lower stool flange, (d) an outer magnet assembly that comprises an outer magnet holder and at least one outer magnet, (e) an inner magnet assembly that comprises an inner magnet holder, an inner core, and at least one inner magnet, (f) a driver coupling that has a central core, (g) a bearing housing that has a hollow cylinder, (h) upper and lower inner bearings, and (i) upper and lower outer bearings, wherein said annular mounting flange is coaxially, sealably and fixedly connected to a shroud flange of said static shroud, to the lower stool flange of said stool assembly and to the nozzle flange of the vessel; wherein a lower end of the driver coupling is coaxially, sealably and fixedly connected to an upper part of the outer magnet holder of said outer magnet assembly; wherein said driver coupling accommodates coaxially in its central bore a prime mover shaft of a prime mover having a first keyway for coupling together said driver coupling and said prime mover shaft; wherein said driver coupling is coaxially, sealably, and rotatably connected to said stool assembly through said upper outer bearing; wherein said outer magnet assembly is coaxially, sealably and rotatably connected to said stool assembly through said lower outer bearing; wherein said inner magnet assembly is coaxially, sealably and fixedly connected through a second keyway to an inner shaft with a coupling wherein said inner shaft with the coupling is partly accommodated coaxially in a central bore of the inner core of said inner magnet assembly, said inner core having a coaxial central stepped hole, wherein said second keyway fits inside a slot of a lower smaller diameter part of said stepped hole; wherein said inner shaft with the coupling is coaxially, sealably and rotatably disposed in the hollow cylinder of said bearing housing through said upper and lower inner bearing; and wherein a prime mover mounting-flange of said prime mover is coaxially and fixedly mounted on the upper stool flange of said stool assembly.