Nonmetallic package seal assembly

Claim 2

In a package seal assembly for rotatably sealing a shaft extending through a passage in a vessel wall, including a sleeve member adapted to slidably receive said shaft and to corotate with said shaft, rotating seal means carried by said sleeve, stationary seal means carried by said vessel about said passage, and means for urging said rotating and stationary seal means into fluidtight rotary sealing engagement, the improvement comprising: a. said sleeve having one enlarged end which together with said shaft forms an annular space therebetween opening axially from said sleeve; b. a ceramic insert bonded to said enlarged sleeve end which extends radially inwardly towards said shaft so as to substantially close the opening of said annular space, said insert together with the inner periphery of said enlarged sleeve and forming a seal seat; c. seal means in said seat for sealing between said shaft and the inner pEriphery of said enlarged sleeve end; and d. a corrosion-resistant coating on the outer peripheral surface of said sleeve extending over said enlarged sleeve end and said ceramic insert and along the internal peripheral surface of said enlarged sleeve end.

Claim 3

A package seal assembly as set forth in claim 1 in which said corrosion-resistant coating extends across the lowermost end of said sleeve and said ceramic insert to protect the bond between said sleeve and insert from corrosive attack.

Claim 4

In a package seal assembly for rotatably sealing a shaft extending through a passage in a vessel wall, including a sleeve member adapted to slidably receive said shaft and to corotate with said shaft, said sleeve having an end exposed to the interior of said vessel, rotating seal means carried by said sleeve, stationary seal means carried by said vessel about said passage, and means for urging said rotating and stationary seal means into fluidtight rotary sealing engagement, the improvement comprising: a. said sleeve having its end exposed to said vessel enlarged wherein the inside diameter of said enlarged end and the outside diameter of said shaft forms an annular space therebetween; b. a flange on said enlarged sleeve end extending radially inwardly towards said shaft, said flange together with the inner periphery of said enlarged sleeve end forming a seal seat within said enlarged end; c. seal means in said seat for sealing between said shaft and the inner periphery of said enlarged sleeve end; d. an internal shoulder on said sleeve engaging a corresponding stop on said shaft for positioning said sleeve on said shaft, said shoulder and stop being located on the far side of said seal means from said vessel whereby said seal means seals said shoulder and stop from the interior of said vessel; e. The outer periphery of said enlarged sleeve end being joined to said sleeve in a smooth radius and the vessel exposed edge of said sleeve being rounded; and f. a corrosion-resistant glass coating provided on said sleeve extending along the outer periphery thereof from a point beyond said rotating seal means over said enlarged sleeve end and said flange and along the eternal peripheral surface of said enlarged sleeve end to a point beyond said seal means.

Claim 5

In a package seal assembly for rotatably sealing a shaft extending through a passage in a vessel wall, including a sleeve member adapted to slidably receive said shaft and to corotate with said shaft, said sleeve having an end exposed to the interior of said vessel, rotating seal means carried by said sleeve, stationary seal means carried by said vessel about said passage, and means for urging said rotating and stationary seal means into fluidtight rotary sealing engagement, the improvement comprising: a. said sleeve having its end exposed to said vessel enlarged wherein the inside diameter of said enlarged end and the outside diameter of said shaft forms an annular space therebetween; b. a flange on said enlarged sleeve end extending radially inwardly towards said shaft, said flange together with the inner periphery of said enlarged sleeve end forming a seal seat within said enlarged end; c. seal means in said seat for sealing between said shaft and the inner periphery of said enlarged sleeve end; d. an internal shoulder on said sleeve engaging a corresponding stop on said shaft for positioning said sleeve on said shaft, said shoulder and stop being located on the far side of said seal means from said vessel whereby said seal means seals said shoulder and stop from the interior of said vessel; e. The outer periphery of said enlarged sleeve end being joined to said sleeve in a smooth radius and the vessel exposed edge of said sleeve being rounded; and f. a corrosion-resistant glass coating provided on said sleeve extending along the outer periphery thereof from a point beyond said rotating seal means over said enlarged sleeve end and said flange and along the eternal peripheral surface of said enlarged sleeve end to a point beyond said seal means.

Claim 6

A package seal assembly as set forth in claim 3 wherein said flange comprises a ceramic insert bonded to the inner periphery of said enlarged sleeve end.