High-reliability fuel metering device driven by stepping motor

Abstract

The invention discloses a high-reliability fuel metering device driven by a stepping motor, wherein the device is used for metering fuel in fuel pump regulators of a gas turbine and an aero-engine. Tobe specific, a stepping motor drives a rotary metering valve to act and thus a shielding area of a circumferential hole of the metering valve is changed, thereby realizing metering of the fuel flow of the metering valve. The device has advantages of novel and simple structure, great easiness in processing and assembling, simple and flexible controlling, and high reliability. The metering valve adopts a circumferential hole design, a radial oil inlet-outlet design and a balanced oil return path design, thereby eliminating the axial force of the valve element of the valve, effectively reducingthe motion resistance moment of the valve element, reducing the clamping stagnation risk of the valve, and improving the dynamic response characteristic and reliability of the metering valve. According to the invention, the angular phase position of the valve element of the metering valve is locked through the holding torque of the stepping motor; the interferences on the valve controlling by external disturbances of mechanical vibration, valve hydraulic force and motor current fluctuation and the like can be resisted; and the robustness and reliability of the fuel metering device can be greatly improved.

Description

technical field [0001] The invention relates to a high-reliability fuel metering device driven by a stepping motor, which is used for fuel metering in fuel pump regulators of gas turbines and aeroengines. The shielded area of ​​the hole realizes the metering of the fuel flow through the metering valve. Background technique [0002] The fuel metering device is the core component of the gas turbine and aero-engine fuel control system and the fuel pump regulator. The engine can accurately measure and control the amount of fuel supplied to the engine combustion chamber and other oil circuits through the fuel metering device. Its metering accuracy and resolution , Consistency, steady-state and dynamic characteristics, reliability and other characteristics directly determine the stability, dynamic characteristics and reliability of the entire engine fuel control. [0003] In order to meet the high requirements of the steady-state and dynamic characteristics of engine fuel control...

AI Technical Summary

Problems solved by technology

The system structure of this scheme is complex, and the precision of processing and assembly is extremely high. In order to meet the dynamic characteristics requirements of the system, this scheme inevitably uses small hole structure sensitive components, which requires extremely high cleanliness of the system, and the movement resistance of the slide valve is extremely high. On the other hand, due to the introduction of small closed-loop control, the robustness of the system is not high, and the ability to resist external environmental disturbances such as mechanical vibration, valve hydraulic power, current fluctuations, and electromagnetic interference is poor. Stability is not easy to guarantee

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