END CONTACT SEAL OF TURBOMACHINE ROTOR Russian patent published in 2017 - IPC F16J15/30 F01D11/00 

FIELD: machine engineering.

SUBSTANCE: end contact seal of turbomachine rotor contains a bushing mounted on the shaft and fixed with respect to the last in the axial direction, an additional bushing rigidly connected to the stator, a graphite ring mounted in an additional bushing and contacting one of its ends with a radial wall of the latter, and an axial spring. Also, the end seal comprises an additional graphite ring mounted on a collar formed on the outer surface of the bushing and in contact with the graphite ring at the end, an additional collar made on the outer surface of the bushing, an annular element made with a complementary collar and contacting by a part of its inner surface with a part of the outer surface of the additional graphite ring. Between the additional graphite ring and the additional collar, an annular cavity is formed in which an axial spring is installed, wherein the graphite ring is fixed against rotation with respect to the additional bushing. The internal diameters of graphite ring, the additional graphite ring, and also the said radial wall are arranged at the same level, in addition, the oil supply channels are provided in the bushing, and in the additional graphite ring - the openings communicating the oil cavity with the annular cavity and the oil supply line respectively.

EFFECT: reduction of the degree of graphite ring wear and increase in the allowable pressure drop across the seal.

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