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Dual-valve orifice-area-variable fuel nozzle

A fuel nozzle and nozzle hole area technology, which is used in fuel injection devices, engine components, machines/engines, etc., can solve the problem that fuel nozzles cannot achieve flexible and adjustable fuel injection rules, and achieve the effect of improving fuel atomization.

Inactive Publication Date: 2014-08-06
CHINA NORTH ENGINE INST TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is: the current single-needle valve fuel nozzle cannot realize flexible and adjustable fuel injection rules and poor fuel atomization effect under low fuel supply pressure

Method used

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  • Dual-valve orifice-area-variable fuel nozzle

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Embodiment Construction

[0021] Preferably, the oil inlet ring groove 9 of the adapter seat 3 communicates with the oil inlet hole 27 of the adapter seat. The nozzle body 6 includes two oil inlet passages, the main oil inlet hole 23 and the auxiliary oil inlet hole 11. The main oil inlet hole 23 and the auxiliary oil inlet hole The oil holes 11 communicate with the oil tanks 12 respectively.

[0022] Preferably, the number of milling planes 20 is 2 to 4, and they are evenly arranged in the circumferential direction.

[0023] Preferably, the number of oil inlet grooves 13 is 2 to 4, and they are evenly arranged in the circumferential direction.

[0024] Preferably, the hydraulic diameter of the auxiliary nozzle hole 14 is smaller than 1 / 4 of the hydraulic diameter of the main nozzle hole 15 .

[0025] Preferably, the cone angle of the conical surface where the main injection hole 15 and the auxiliary injection hole 14 are located is in the range of 140°-160°, and the number of injection holes is in th...

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Abstract

The invention relates to a dual-valve orifice-area-variable fuel nozzle which comprises an ejector rod (1), a sleeve valve spring (2), a switching base (3), a needle valve spring (4), a sleeve valve (5), a nozzle body (6) and a needle valve (7). The sleeve valve (5) and the needle valve (7) which control opening of orifices are arranged in the nozzle body (6). The sleeve valve (5) is arranged in the nozzle body (6) and the needle valve (7) is arranged in the sleeve valve (5). The auxiliary orifice (14) and the main orifice (15) are formed in the nozzle body (6). The sleeve valve (5) controls opening and closing of the auxiliary orifice (14) and the needle valve (7) controls opening and closing of the main orifice (15). The dual-valve orifice-area-variable fuel nozzle can be applied to a fuel supply system composed of inline type fuel injection pumps or monoblock pumps, the orifice area is controlled through fuel supply pressure of the pumps, so that the law that fuel is injected slowly and then injected rapidly or the fuel is injected in a stepped mode is finally achieved, the fuel atomizing effect under low injection pressure is improved, the orifice area can be changed through fuel pressure change.

Description

technical field [0001] The invention belongs to the technical field of engine fuel injection systems, in particular to a fuel injector for controlling fuel injection rules and improving fuel atomization. Background technique [0002] In order to meet the requirements of the engine emission regulations and improve the economy and controllability, the requirements for the flexibility of the injection characteristics of the fuel injection system are getting higher and higher. The purpose is to achieve high-efficiency combustion and clean emissions at all operating points of the engine, and a matching fuel system is required. The fuel can be injected into the cylinder of the engine in a fixed and quantitative manner according to the established fuel injection law, and it can be well mixed with the compressed air in the cylinder after being fully atomized. The matching of the fuel injection law and the ventilation process is the main research approach to improve the combustion pe...

Claims

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Application Information

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IPC IPC(8): F02M61/04
Inventor 王敏康彦红孙勇徐春龙赵中余
Owner CHINA NORTH ENGINE INST TIANJIN
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