Fuel cut-off valve of reheat fuel control unit of turbofan engine

Abstract

The invention provides a fuel cut-off valve which is suitable for aero-engine fuel systems and can delay for a longer time and cut off fuel in sequence. The fuel cut-off valve can control spring forceand the diameter of a flow nipple according to design requirements, thereby achieving functions of lingeringly cutting off reheat bypass, reheat intension and reheat starting oil supply. The fuel cut-off valve of a reheat fuel control unit of a turbofan engine consists of a valve 1, a valve lining 2, a nozzle tip 3, a spring 4 and a sealing rubber cup 5, wherein the valve 1 is arranged in the valve lining 2; the nozzle tip 3 is arranged in a through hole in the middle of the valve 1; the valve 1 is provided with a plurality of through slots; the valve lining 2 is arranged in a shell by interference fit; and the valve lining 2 is provided with oil through holes corresponding to the through slots on the valve 1. The fuel can be respectively led to a control cavity of a metering valve in each area through the oil through holes. The spring 4 is arranged on a spring cavity formed between the top of the valve and the shell, and the airtightness of the spring cavity is ensured by mounting the sealing rubber cup 5 on the valve 1.

Description

technical field [0001] The invention relates to a regulator valve, in particular to a fuel cut-off valve in an afterburner fuel regulator of an aviation turbofan engine. Background technique [0002] The fuel cut-off valve is the core component of the emergency cut-off device in the nozzle booster regulator of the turbofan engine, and its function is to meet the timing requirements of the engine booster fuel cut-off. [0003] The afterburner emergency cut-off function in the aeroengine fuel regulation system is a function of the engine nozzle afterburner regulator in the afterburner fuel control. When an emergency occurs in the state of engine boosting, the pilot will press the electrical signal in the cabin or manipulate the throttle lever to make the engine exit the state of boosting fuel supply in sequence. In the past, most domestic aero-engine fuel adjustment systems used mechanical hydraulic control methods. This control method was relatively mature in terms of design...

AI Technical Summary

Problems solved by technology

In the past, most domestic aero-engine fuel regulation systems used mechanical-hydraulic control methods. This control method is relatively mature in terms of design, technology and reliability, but it involves many hydraulic actuators, making the regulator poorly modifiable and difficult to adjust. , The maintenance workload is large, the processing requirements of parts are high, and the structure is complex. Now there is a full-authority digital electronic control system that can well meet the control requirements. In this system, a fuel cut-off valve that can meet the requirements is needed.

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