Double-wall large elbow pipe structure

Abstract

The invention discloses a double-wall large elbow pipe structure, which belongs to the technical field of aero-engines and comprises a large elbow pipe outer wall, a large elbow pipe inner wall and a pin, wherein the pin penetrates through the large elbow pipe outer wall and is fixedly connected with the large elbow pipe outer wall, and the end part of the pin abuts against the large elbow pipe inner wall to form a gap between the large elbow pipe outer wall and the large elbow pipe inner wall. One end of the inner wall and the outer wall of a double-wall large elbow is designed into an L-shaped structure, a bolt connection mode is adopted, the inner wall of the large elbow at the other end is designed into a structure with a U-shaped groove and a bolt hole in a straight edge, the corresponding end of the outer wall of the large elbow is designed into a straight section which is inserted into the U-shaped groove in the inner wall of the large elbow, the bolt hole is used for axial and circumferential positioning of the large elbow, is easy to disassemble and assemble, and moreover, the joint is firm and reliable, and the sealing effect is good. The distance between the outer wall of the large elbow and the inner wall of the large elbow can be adjusted by adjusting the length of the pin between the outer wall of the large elbow and the inner wall of the large elbow.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, in particular to a double-wall large curved pipe structure. Background technique [0002] The large elbow is a key component of the flame tube of the recirculation combustor and a unique structure of the flame tube of the recirculation combustor. Its function is to deflect the high-temperature gas in the flame tube by 180° and introduce the gas into the turbine guide vane. With the continuous improvement of the power-to-weight ratio of the engine, higher inlet air temperature and pressure, on the one hand, put forward higher requirements on the heat transfer capacity of the flame tube wall, on the other hand, the higher inlet pressure also increases the strength requirements of the flame tube. . As the key part of the flame tube of the return flow combustor, the large elbow is not only required to have a strong cooling function, but also bears a high aerodynamic force due to its proximity t...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art, to provide a double-walled large elbow with a simple structure and easy to disassemble, which can be applied to the large elbow structure of various return combustion chambers, so as to solve the problem of flames in traditional engine combustion chambers. The one-piece large elbow in the cylinder has cracks at the weld, cannot be disassembled, and is inconvenient for maintenance, and the detachable large elbow has problems such as weak connection and insufficient airtightness.

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