A Nozzle Thermal Insulation Structure for Thrust Steering Jet Engine

Abstract

The invention relates to a nozzle insulation structure for thrust steering jet engines. The structure is suitable for field of medium and small thrust aero-engines having thrust steering demands. Thestructure consists of 1 # heat shield (9), 2 # heat shield (8), 3 # heat shield (7), 4 # heat shield (6), elastic connecting sleeve members (13) and air entraining holes (2). The heat shields forms anoverall structure member; a friction material is a high temperature alloy, and the friction material is simple in structure, light in weight and good in maintainability, and is capable of repeated assembly and disassembly; gaps are designed between the heat shields so that no additional load can be achieved during a nozzle steering process; a heat bearing part is separated with a bearing part, and therefore, high temperature resistance demands can be met, long service life can be achieved, and reliability of the structure can be enhanced; and through the controlling of the designed gaps, cooling air entraining amount can be decreased, and engine thrust losses can be reduced.

Description

[0001] 1. Technical field [0002] The invention relates to an integral rotary nozzle heat insulation and its connection structure, which is suitable for the field of small and medium thrust aeroengines requiring thrust steering. [0003] 2. Background technology [0004] The high-deflection vector thrust engine is one of the necessary components to realize the vertical / short take-off and landing of fighter jets. The three-bearing steering nozzle is the core component of the high-deflection vector thrust engine. In order to realize the engine thrust from horizontal to vertical, the engine exhaust The tube is divided into three sections. The end face of the nozzle interface of each section is at a certain angle to the axis of the nozzle and is equipped with an adapter bearing. The rotation of the three sections of the nozzle at different speeds and directions is realized through the driving device according to a certain control law, thereby realizing Steering of thrust. With th...

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Problems solved by technology

[0005] Due to the complex structure of the three-bearing steering nozzle, a thermal insulation cooling structure is required to achieve effective cooling and heat insulation in all attitudes without bringing additional running resistance to the normal operation of the mechanism. Factors such as the size limitation of the tube, these have increased the difficulty of designing and processing the heat insulation structure

Over the years, the structural design, especially the thermal insulation protection design technology, has been in the hands of foreign advanced countries. There are very few domestic groups that have completed the design and carried out related experiments, and there are few results.

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