Airtight end frame on tail section of aircraft

Abstract

The invention relates to airtight end frames on the tail sections of aircrafts, in particular to an airtight end frame with a novel structure and high bearing reliability. The airtight end frame comprises a spherical skin, a frame edge, radial strips, an auxiliary frame, a reinforcing ring, an in-out opening frame and an in-out opening cover. The frame edge is a y-shaped sectional material frame edge strip and is located in the connection position of the periphery of the end frame and a fuselage. The auxiliary frame is arranged in the frame edge position. The radial strips are distributed on the inner side of the spherical skin and are Z-shaped plate bent pieces. An in-out opening is formed in the center of the spherical skin. The in-out opening cover is mounted at the in-out opening through the in-out opening frame. Compared with the prior art, the technical defects that under the condition that an airtight end frame on the tail section of an aircraft is a non-symmetric spherical surface, an existing end frame structure is low in bearing strength and poor in bearing reliability are overcome, the mechanical performance of the airtight end frame is improved overall, and the servicelife of the airtight end frame is prolonged overall.

Description

technical field [0001] The invention relates to an airtight end frame at the tail section of an aircraft, in particular to a novel structural airtight end frame with high load bearing reliability. Background technique [0002] In the structural design of the rear airtight end frame of the airtight aircraft at home and abroad, two structural design forms, the planar frame and the spherical frame, are widely used. In AN-12 and a certain type of domestic aircraft, because the upper part of the fuselage is round and the lower part is an irregular curve, the structural design of the upper part of the spherical frame and the lower part of the planar frame combined with the planar frame is adopted. [0003] After analyzing the structural forms of the airtight end frames of various aircraft at home and abroad, it is concluded that the rear airtight end frames of the aircraft designed with the planar frame structure are mostly used when the fuselage frame section is small, while the ...

AI Technical Summary

Problems solved by technology

According to the above analysis, adopt the airtight end frame of spherical frame structure, and need to overcome the shortcomings of low space utilization of spherical frame and the shortcomings of uneven force and poor bearing capacity when arranged at irregular cross-sections

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