CONTROL RING OF STAGE OF BLADES WITH VARIABLE ANGLE OF INSTALLATION FOR GAS TURBINE ENGINE Russian patent published in 2019 - IPC F01D17/16 F04D29/56 

FIELD: machine building.

SUBSTANCE: blade stage control ring with variable installation angle for gas turbine engine comprises annular housing arranged around crankcase, means made with possibility of connection with vanes articulated pins, and means configured to interact with the casing for alignment and direction of the housing and comprising a support member on the crankcase fixed to the housing by fasteners. Fasteners include a bushing comprising an axial hole for passage of a support member or support member of said member, a through slot extending into the hole and configured to provide radial deformation of the sleeve, and an external thread for screwing the sleeve into the thread of the opening of the housing. Sleeve is made so that, during its screwing, it interacts with case deforming in radial direction from first to second position. In the first position it is possible to install and move the support member or support element in the hole. In the second position, the bushing is strained in the radial direction and tightly fitted on the support member or support element, which thus leads to its locking relative to the bushing. Another invention relates to a stage of blades with variable angle of installation for a gas turbine engine, which contains a ring row of blades, with a feather and a pivot pin on radial external end of each, and also annular crankcase containing openings for installation of pivot pins of blades. Rotary pivots of blades are connected by means of levers with the above control ring. One more invention relates to a gas turbine engine comprising said control ring or said stage of blades.

EFFECT: group of inventions improves reliability of blade control ring with variable angle of installation.

12 cl, 5 dwg