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Fluid metering valve in low-temperature environment

A technology of metering valve and low temperature environment, which is applied in the fuel control of turbine/propulsion device, jet propulsion device, turbine/propulsion fuel delivery system, etc., can solve the problem of low temperature starting performance deviation of engine, and achieve high consistency of flow characteristics, The effect of high anti-pollution ability and simple processing procedure

Active Publication Date: 2019-12-13
BEIJING HANGKE ENGINE CONTROL SYST SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For engines of small and medium power levels, the flow difference of this magnitude may cause deviations in engine low-temperature starting performance

Method used

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  • Fluid metering valve in low-temperature environment
  • Fluid metering valve in low-temperature environment
  • Fluid metering valve in low-temperature environment

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Embodiment Construction

[0030] See attached Figure 1a and 1b , providing a fluid metering valve in a low temperature environment, the metering valve includes a metering oil needle and a bushing, the bushing has an oil through hole, and the oil needle is passed through the oil through hole; the oil needle and the There is a matching gap between the oil holes, which is used for the metered fuel;

[0031] The outer diameter of the oil needle and the inner diameter of the oil hole are clearance fit, and the clearance is less than 0.05mm;

[0032] An inclined plane or curved surface is formed on the outer wall of the oil needle, and a round hole is formed between the inclined plane or the curved surface and the oil hole, and as the oil needle slides axially, the flow area of ​​the round hole will increase. change, thereby affecting the flow of fluid.

[0033] The kinematic viscosity range of the fluid is 0.7mm 2 / s.

[0034] The fluid is the fuel of an aero-engine.

[0035] The inclined plane forms ...

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Abstract

The invention relates to a fluid metering valve in a low-temperature environment. The metering valve comprises a metering oil needle and a bushing, wherein an oil through hole is formed in the bushingand penetrates the oil through hole; the oil needle and the oil through hole are in clearance fit, and the clearance allows metered fuel oil to pass through; the outer diameter of the oil needle is in clearance fit with the inner diameter of the oil through hole, and the clearance amount is smaller than 0.05 mm; an inclined plane or curved surface is formed on the outer wall surface of the oil needle, and the inclined plane or curved surface and the oil through hole form segmental hole fit; the flow area of the segment hole changes along with axial sliding of the oil needle, and the flow rateof fluid is affected accordingly. The effective hole clearance is larger, actual flow is closer to orifice throttling, and the valve is less influenced by viscosity and has better low-temperature flow characteristic.

Description

technical field [0001] The invention relates to the field of low-temperature fluid control, in particular to a fluid metering valve in a low-temperature environment, which is suitable for a fuel metering unit of an aero-engine fuel pump regulator, and is used to realize accurate metering of fuel, and at the same time ensure the accuracy of fuel metering under low-temperature environment conditions sex. Background technique [0002] The fuel pump regulator is an important part of the aero-engine control system, in which the fuel metering valve realizes accurate metering of the fuel flow by changing the opening of the valve. Generally, the fuel metering valve adopts the structural form of "metering needle-orifice plate", and the surface of the metering needle is a conical surface. , The annular flow window formed by the oil needle and the orifice plate has a small gap, and the flow section is a gap flow. Due to the increase of the kinematic viscosity of the fuel under low tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02C9/26
CPCF02C9/263
Inventor 刘雪娇毛碧波杨天硕杨惠英
Owner BEIJING HANGKE ENGINE CONTROL SYST SCI & TECH
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