An aero-engine hydraulic system oil supply switch and a switching method

By designing a hydraulic system oil supply switching switch for aircraft engines and utilizing the axial movement of a slide valve between two working positions, the problems of inability to quickly connect to ground hydraulic equipment and fuel leakage in the engine assembly state were solved, achieving rapid and leak-free oil supply switching and improving the convenience and safety of ground maintenance of the engine.

CN122407374APending Publication Date: 2026-07-17AVIC GUIYANG ENGINE DESIGN & RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
AVIC GUIYANG ENGINE DESIGN & RES INST
Filing Date
2026-04-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

When the engine is fully assembled, it is not possible to quickly connect ground hydraulic equipment to drive the adjustable nozzle, and disconnecting the pipe joints can easily lead to aviation kerosene leakage.

Method used

Design a hydraulic system oil supply switching switch for an aircraft engine. By axially moving a slide valve between two working positions, the oil supply from the engine itself and the oil supply from ground hydraulic equipment can be quickly switched. The working part of the slide valve is always closed to the non-working oil port to prevent fuel leakage.

Benefits of technology

It enables quick and leak-free fuel supply switching without disassembling engine pipelines, improving the convenience and safety of engine ground maintenance.

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Abstract

本发明公开了一种航空发动机液压系统供油转换开关及转换方法，属于航空发动机技术领域。该开关包括开关壳体和滑阀；壳体内设有用于连接发动机液压系统的第一油口、第二油口及用于连接地面液压设备的第三油口。滑阀具有小端部和直径更大的工作部，可在第一工作位置与第二工作位置间轴向移动。第一工作位置时，A与B连通，C被封闭；第二工作位置时，C与B连通，A被封闭。本方法的操作实现无泄漏油路转换，无需拆装发动机管路即可快速连接地面液压设备，避免了燃油泄漏，结构紧凑，操作便捷，显著提高了航空发动机的维护性。
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Citation Information

Patent Citations

  • CN119616681A