Fir-tree type disc tenon connecting device

Abstract

The invention relates to a fir-tree type disc tenon connecting device. The fir-tree type disc tenon connecting device comprises a tenon and a tenon groove which are connected in a matched mode, wherein the tenon comprises a first tenon tooth and a second tenon tooth which are symmetrically arranged in structures; tooth widths of tooth surfaces which are arranged on the first tenon tooth and the second tenon tooth are equal; tooth widths of lower planes which are arranged on the first tenon tooth and the second tenon tooth are equal; pressure angles of the tooth surfaces are the same; a tooth end surface of the second tenon tooth is a plane; the tenon groove comprises a first tenon groove and a second tenon groove, and the first tenon groove and the second tenon groove are correspondingly arranged; the first tenon groove and the second tenon groove are each provided with a plane groove surface adhered to the corresponding tooth surface and a large circular arc connected with the corresponding groove surface in a cutting mode; and the bottom of each groove is a plane. By adopting the fir-tree type disc tenon connecting device, the problem of stress concentration at a connecting partof the blade tenon and the wheel disc tenon groove is greatly improved, so that a cooling air channel between the tenon and the tenon groove is enlarged, the temperature of the connecting part is greatly reduced, the working reliability is good, and the high-quality requirement of an aeroengine for a turbine rotor is met.

Description

technical field [0001] The invention relates to the technical field of aero-engines, in particular to a fir tree-shaped tenon-tenon connection device. Background technique [0002] Aeroengine turbine rotors usually use fir tree-shaped tenon-tenon joints to assemble turbine discs and blades. The force is transmitted between the tenon and tenon-groove through several contact surfaces. The working temperature of the joint is relatively high, which can reach 900K or even higher. The centrifugal force generated by the rotating blades causes higher stress at the connection between the tenon of the blade and the tenon and groove of the wheel disk. At present, this structure in the prior art has the characteristics of narrow structural design space, complex structural form, obvious stress concentration, and high working temperature. For higher performance requirements, the working environment of turbine components is becoming more and more harsh. The existing fir tree-shaped tenon-...

AI Technical Summary

Problems solved by technology

At present, this structure in the prior art has the characteristics of narrow structural design space, complex structural form, obvious stress concentration, and high working temperature. For higher performance requirements, the working environment of turbine components is becoming more and more harsh. The existing fir tree-shaped tenon-tenon connection structure cannot meet the high-quality requirements of aero-engines for turbine rotors, and the work reliability is poor.

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