A Force-Compensated Pressure Differential Oil Return Valve and Design Method of Force-Compensated Parameters

Abstract

This application belongs to the technical field of constant pressure difference flow control, and particularly relates to a force compensation type pressure difference oil return valve and a force compensation parameter design method; it relates to a force compensation type pressure difference oil return valve, including a bushing, a valve core, a spring, and a gear Pump, metering valve and damping hole; a baffle is set in the inner cavity of the valve core to form a central cavity, the first and second oil return windows are opened on the wall of the valve core, and the matching first 1. The second oil return chamber; the open end of the bottom of the bushing is connected to the fuel oil inlet and outlet pipeline, and a piston is arranged in the inner chamber, and the upper part of the piston forms a ring chamber that communicates with the central chamber. The force-compensated differential pressure oil return valve of this application eliminates the influence of the spring force increment and steady-state hydraulic force on the differential pressure, keeps the pressure differential of the oil return valve at a relatively stable position, and the flow characteristics of the entire system are more stable , which improves the control precision of the control system; moreover, the design method of force compensation parameters can be applied in engineering and has strong practicability.

Description

technical field [0001] The application belongs to the technical field of constant pressure difference flow control, and in particular relates to a force compensation type pressure difference oil return valve and a force compensation parameter design method. Background technique [0002] Aeroengine and gas turbine fuel control systems widely adopt the principle of constant pressure difference flow control, that is, the pressure difference between the front and rear of the metering valve is kept constant through the pressure difference maintaining unit (the following "pressure difference" refers to the pressure difference before and after the metering valve), so that the fuel flow is only equal to The flow area is related. On this premise, the metering valve is controlled to change the fuel flow area to adjust the fuel flow. [0003] In different types of fuel control systems, there are various types of differential pressure maintaining units. According to whether there is an ...

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Problems solved by technology

[0021] Both the spring force increment and the steady-state hydraulic force are proportional to the opening of the oil return window, so for figure 1 For the system shown, the smaller the opening of the metering valve, the larger the oil return volume, the larger the opening of the oil return window, and the more the pressure difference deviates from the desired value. Negative Effects

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