| 摘要 |
A gas-sealed shaft packing, comprises a rotary sealing ring which is adapted to be fixed to the shaft for rotation therewith and which has respective end surfaces which are spaced apart slightly from respective fixed sealing rings to define a sealing gap on respective sides of the rotary sealing ring. The fixed rings are biased toward the movable ring and gas conduits extend from a housing into each fixed ring and terminate in the gap between the fixed ring and the associated rotary sealing ring. The fixed rings are held by flange members which extend radially inwardly from the housing toward the shaft and resilient diaphragms are disposed between the flanges and the fixed rings or non-rotatable rings so as to urge them toward the rotatable sealing ring carried by the shaft. The biasing means also divides the housing to a space adjacent the shaft on one side of the diaphragms and a space adjacent the housing on the other side and gas is delivered into the gap through a conduit connected into each fixed ring and it escapes in both radial directions in respect to the shaft into the associated spaces on each side and then flows through an outlet conduit which may be advantageously regulated by a valve. |
