Labyrinth seal with contamination trap

F - Mech Eng,Light,Heat,Weapons – 16 – J

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277/15

F16J 15/447 (2006.01) F01D 11/02 (2006.01) F16J 15/44 (2006.01)

Patent

CA 1178985

D-5,694 C-3,392 LABYRINTH SEAL WITH CONTAMINATION TRAP Abstract of Disclosure A labyrinth seal of abradable design is disposed between a shaft and a partition separating regions of high and relatively lower gas pressure. The seal is located in close proximity to a gas permeable bearing also disposed between the shaft and the partition and located in the relatively lower pressure region. The seal permits limited leakage gas flow toward and through the bearing and pieces of seal material abraded during shaft rotation tend to entrain in the leakage gas flow. A baffle is disposed on the shaft between the seal and the bearing and defines a portion of a serpen- tine path for the leakage gas flow. A contamination trap containing a self-supporting adhesive material is formed on the baffle perpendicular to a portion of the serpentine path so that while the leakage gas turns 90° at the trap, the heavier particles of abraded material impact on and are captured by the adhesive material.

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