SYSTEM TO PREVENT WEAR OF TIP AIRFOIL SHROUD PLATFORM OF TURBINE BLADE Russian patent published in 2012 - IPC F01D5/22 

FIELD: machine building.

SUBSTANCE: system to prevent wear of the tip airfoil shroud platform of the turbine blade comprises a turbine blade slot formed on the surface of the tip airfoil shroud platforms, and a rigid tube, mounted in the slot and has a durable outer surface. The tip airfoil shroud platform contacts the neighbour tip airfoil shroud platform when the turbine works at the contact surface. The contact surface has an interface that has a profile in the form of letter "Z". The tip airfoil shroud platform urther comprises a cut-off tooth, forming a ledge that runs along the middle of the upper surface of the tip airfoil shroud platform. The interface includes the middle surface of contact corresponding to the middle section of the profile in the form of letter "Z". The middle surface of contact has a substantially rectangular shape which substantially corresponds to the form of cross-section of a shearing tooth.

EFFECT: invention allows to improve wear resistance of the tip airfoil shroud platform of turbine blades, to increase its service life and to facilitate its maintenance.

9 cl, 5 dwg