METHOD FOR REDUCING NUMBER OF NOZZLE BLADES IN TURBINE NOZZLE Russian patent published in 2024 - IPC F01D9/04 B22C1/08 

FIELD: engine building.

SUBSTANCE: invention relates to turbine nozzles and can be used in the development of gas turbines. During finishing work on the turbine, in order to eliminate resonant vibrations of the turbine rotor blades, it is necessary to change the number of nozzle blades located in front of and behind the impeller. In the method of reducing the number of blades in a turbine nozzle, in which a reduced number of nozzle blades is installed in the circumferential direction with a constant pitch, in contrast to the known one, a set of models of nozzle blades of an existing design is made before installation using an existing model mould; using an electronic model of a nozzle blade existing design, electronic models of inserts for the upper and lower shelves are created; according to the electronic models of inserts for the upper and lower shelves of the nozzle blade, corresponding model moulds are designed and manufactured, with the help of which moulded models of inserts for the shelves are made, which are then attached by sticking to the side the ends of the shelves of the moulded models of nozzle blades of the existing design, thus forming a model of a nozzle blade of a modified design with flanges wider in the circumferential direction, then using the assembled model of a nozzle blade of a modified design using lost wax casting technology, castings of nozzle blades with a larger circumferential width are made direction by the width of the shelves, then they are machined and assembled into a nozzle having a reduced number of blades by installing nozzle blades with an increased width of the shelves in the circumferential direction with a constant pitch.

EFFECT: reduced labour intensity, material costs and time for fine-tuning the turbine while ensuring the reliability of its operation.

1 cl, 5 dwg