END GAS DYNAMIC SEAL OF TURBOMACHINE ROTOR SUPPORT Russian patent published in 2016 - IPC F16J15/34 F04D29/08 

FIELD: aviation.

SUBSTANCE: invention relates to aircraft engineering, specifically to seals of oil cavities of supports of rotors of gas turbine engines and power plants. End gas dynamic seal of turbomachine rotor support comprises non-rotating sealing ring which is movable in axial direction of primary seal, pressed by springs or spring to rotary bushing, at working end of which there are spiral gas dynamic chambers, and secondary seal, made in form of a sealing split ring installed in groove of housing together with contacting with it at ends two additional sealing rings and intermediate ring. Whole package of secondary seal is locked by split resilient ring. Seal ring of primary seal is installed in a housing and is fixed against rotation due to presence on its outer surface of a protrusion and locked by resilient split ring from falling during mounting due to action of spring. Said sealing ring and contacting with it on cylindrical outer surface sealing split ring of secondary seal are made from wear-resistant material with low coefficient of sliding friction in pair with steel and with high heat conductivity, preferably of bronze BrS30. Sealing split ring of secondary seal is made with a radial cut with width of more than 100 mcm and width of cut is made such that, at required value of tension between sealing ring, tightness of all joints in all operating conditions of turbo-machine is ensured as well as absence of direct contact of sealing ring of primary seal with rotary bushing, and gap in section of sealing ring of secondary seal stays completely selected.

EFFECT: invention ensures higher reliability of sealing.

1 cl, 3 dwg