Integral bearing support structure

Abstract

The invention discloses an integral bearing support structure, and belongs to the technical field of small turbojet engine for aviation. An annular cavity is arranged on an original bearing support body; through the fuel oil pipeline and pipe joint introduced from the annular cavity, the fuel oil, which is supplied to the combustion chamber by an engine, is introduced into the annular cavity in advance, and at the same time a bearing lubricant nozzle is arranged in the annular cavity. The fuel oil that is introduced into the annular cavity can carry out sufficient heat exchange with the hot-end components of the engine, the preheating of fuel oil and cooling of bearing are both achieved effectively, and moreover, the provided lubricant nozzle arranged in the annular cavity enhances the lubricating effect on bearing. The provided integral bearing support structure can be directly applied to a small turbojet engine adopting a 0-2-0 bearing structure. The functions of fuel oil preheating, bearing cooling, and lubricating effect enhancement can be achieved without increasing the size and weight of an engine; furthermore, the combustion efficiency of engine is prominently improved, and the service life of engine is prolonged.

Description

technical field [0001] The invention relates to an integrated structure of a bearing support with a fuel preheating ring cavity and capable of realizing effective lubrication, which is especially suitable for small turbojet engines for unmanned aerial vehicles and bombs. Background technique [0002] The small turbojet engine is mainly used as the power device of UAV and subsonic cruise missile. It pursues high thrust ratio and low cost, and requires the structure to be as simple as possible under the premise of meeting the functional requirements. Therefore, most small turbojet engines have abandoned the complex lubricating oil system, and adopted the method of integrating fuel and lubricating oil and directly lubricating the bearing with fuel, that is, a thin oil pipe drawn from the main fuel line is welded on the bearing support, and fuel is injected to lubricate the bearing. Although this lubrication method is simple, it is difficult to ensure the welding process of the ...

AI Technical Summary

Problems solved by technology

The first method preheats the fuel while reducing the temperature of the lubricating oil, which kills two birds with one stone, but requires a complex and heavy heat exchanger, increases the size and weight and increases the cost, and is not suitable for small turbojet engines; the second method is simple and effective. It can significantly increase the temperature of hot oil, but it will cause difficulties in engine pipeline processing and complicated installation. In addition, the temperature in the combustion chamber is too high. Long-term use may burn out the preheating fuel pipe

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