Shaft seal and turbine using the shaft seal

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

Patent

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Details

F16J 15/54 (2006.01) F01D 11/00 (2006.01) F16J 15/32 (2006.01)

Patent

CA 2303151

A shaft seal having a high abrasion resistance is disclosed, by which the leakage of the gas from the high-pressure side to the low-pressure side can be reduced. In the shaft seal, flexible leafs are multi-layered to form a ring shape. The shaft seal is mainly arranged around the rotation shaft of a gas turbine or the like. The relevant turbine comprises a casing, a compressor, a rotation shaft, moving blades attached to the rotation shaft, and stationary blades attached to the casing in a manner such that the stationary blades face the moving blades, wherein the shaft seals are provided between a plurality of stationary blades and the rotation shaft wherein the leaves of each shaft seal contact the rotation shaft. Under the rated operating conditions, the top ends of the leaves slightly separate from the surface of the rotation shaft due to the dynamic pressure generated by the rotation of the rotation shaft. When the turbine is not operated, the top ends of the leaves contact the rotation shaft again due to the elastic restoring force of the leaves.

L'invention concerne un joint d'arbre présentant une excellente résistance à l'usure, qui réduit le volume des fuites de gaz depuis un côté haute pression vers un- côté basse pression. De fines feuilles flexibles (18) sont laminées en forme d'anneau et placées principalement autour d'un arbre rotatif (11) sur une turbine à gaz, ladite turbine comprenant un carter (12), un compresseur, un arbre rotatif (11), des pales de rotor installées sur l'arbre rotatif (11) et un aubage de stator monté sur le carter (12) en position opposée à celle des pales de rotor. Le joint est placé entre les aubes du stator et l'arbre rotatif (11), de sorte que chaque feuille fine (18) vienne au contact de l'arbre rotatif (11). Ainsi, dans les conditions assignées de fonctionnement, l'extrémité des feuilles fines (18) se dégage en flottement léger par rapport à la surface de l'arbre rotatif (11) sous l'effet d'une pression dynamique exercée par la rotation de l'arbre rotatif (11) et, lorsque le fonctionnement est interrompu, ladite extrémité touche à nouveau l'arbre rotatif (11) sous l'effet d'une force de rétablissement élastique de ces feuilles fines (18).

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