SEALING SYSTEM WITH TWO ROWS OF COMPLEMENTARY SEALING ELEMENTS Russian patent published in 2019 - IPC F01D11/02 F16J15/447 

FIELD: machine building.

SUBSTANCE: sealing system located in cavity (C) of fan channel and turbine (VC, VT) between stator shell SI and turbomachine rotor shell VI, comprising stator sector (10) and rotor element (11), wherein cavity (C) between the base (SI) of fixed rectifier blade (PS) of stator sector (10) and rotor element (11) complementary thereto. Base (SI) comprises first surface (21) provided with an at least partially abrasive coating (22). Rotor element (11) is provided with at least one sealing element (23) of a first group of sealing elements facing the first surface, wherein first surface (21) and sealing element (23) of the first group of sealing elements form first sealing pair (20) and define between each other a first leakage area. Base (SI) comprises second surface (24a) provided with an at least partially abradable coating (32). Rotor element (11) is provided with at least one sealing element (33) of a second group of sealing elements facing second surface (24a), wherein second surface (24a) and sealing element (33) of the second group of sealing elements form second sealing pair (30) and define between each other a second leakage area. First sealing pair (20) tends to the minimum leakage area, when the second sealing pair (30) tends to the corresponding maximum leakage area, wherein the first pair (20) with leakage tends to the maximum leakage area, when second pair (30) tends to minimum leakage area, during engine operation. First and second sealing pairs are located through the axial gap from each other. First sealing pair and second sealing pair are axially spaced from each other along the longitudinal axis of the turbomachine, so that abradable coating (32) of second sealing pair (30) is axially separated from platform (R') of stator sector (10). In the invention it is possible to take advantage of deformations of the stator and the rotor of the turbomachine during its operation. Due to the presence of an axial gap between the sealing pairs, for the required compensation between the leakage flows, the effect of the stator and rotor skewing relative to each other is rationally used.

EFFECT: invention makes it possible to compensate for the relative gap of the first sealing pair by reducing the leakage flow through the second sealing pair.

9 cl, 3 dwg