TRANSITION CHANNEL OF GAS TURBINE ENGINE TURBINE Russian patent published in 2023 - IPC F01D25/14 F01D9/06 F02C7/20 F01D25/26 

FIELD: power engineering.

SUBSTANCE: invention can be used in the design of turbines of gas turbine units (GTU) for land use. A transition channel between the high and low pressure turbines of a gas turbine engine, containing an outer casing, an internal casing, a thermocouple casing, and a middle casing. It also contains a flexible element and a thermal insulation body, and the inner body in the axial direction with the flexible element is connected by means of a welded joint with the width of the contact surface E, the flexible element at the welded connection with the inner body is made with axial slots evenly distributed in the circumferential direction, while the number axial slots H equals 2×B…3× B, where B is the number of thermocouple bodies, the width W of the axial slots is equal to 1…5 mm, and their length I is 1.5×E…2×E mm, and at the ends of the axial slots of the flexible element there are holes with a diameter D equal to 3×W mm, and the flexible element is rigidly fixed with a flange bolted connection on the downstream part of the outer casing, an axial gap is made in the downstream part between the thermocouple body and the inner casing, the thermal insulation body is rigidly fixed with a flange bolted connection on the downstream part of the outer casing and telescopically with the front of the outer housing. In addition, the width of the contact surface E of the welded joint is 40…60 mm, and the axial clearance is 2…3 mm. In addition, the flexible element is integral with the flange. In addition, the flexible element is made of a heat-resistant alloy, for example, “ЭП648”, and the thermal insulation body is made of an alloy, for example, “ЭИ868”.

EFFECT: invention makes it possible to improve the reliability of the transition channel design by eliminating wear of the thermocouple housing and the external flange SL, to reduce vibrations of the internal housing, while the design ensures freedom of thermal expansion of hot parts.

6 cl, 5 dwg