Patent ID: 7114726
Filing Date: 2006-10-03
Classification: F04D,F16J

Abstract:
1. A seal assembly for a rotary shaft having a surface speed higher than 200 ft/min. the seal assembly comprising: a housing having a generally cylindrical internal surface receiving the shaft, said internal surface including first and second internal annular grooves spaced longitudinally of and encircling said internal surface; an O-ring disposed in each groove and in contact with the external surface of the shaft and against which the shaft rotates in use; inlet and outlet ports for a cooling fluid extending through the housing into said generally cylindrical internal surface of the housing at locations spaced angularly about the housing and between said O-rings, whereby an annular chamber is defined between the shaft and the housing intermediate the two O-rings, through which a cooling fluid is circulated in use via said ports; and means for creating a positive cooling fluid pressure within said chamber; the O-rings being deformable under said pressure to seal against the rotary shaft.