CN1831321A

CN1831321A - Fuel spray nozzle for premixed combustion of IC engine

Info

Publication number: CN1831321A
Application number: CN 200510052077
Authority: CN
Inventors: 缪雪龙; 俞建达; 黄震
Original assignee: WUXI INST OF OIL PUMP INJECTOR; Shanghai Jiaotong University
Current assignee: WUXI INST OF OIL PUMP INJECTOR; Shanghai Jiaotong University
Priority date: 2005-03-09
Filing date: 2005-03-09
Publication date: 2006-09-13

Abstract

The invention belongs to the field of oil atomizer nozzle of internal-combustion engine, especially applied to preliminary multi-fuel combustion of internal- combustion engine, mainly characterized by that: a. double or multiple layers of atomizing holes are at the head of a needle valve; and b. atomizing cone angle of atomizing hole at the lower layer is greater than that at the upper layer (alpha2 greater than alpha1), thus avoiding two oil mist beams from directly colliding with combustion chamber wall or cylinder wall and able to intensify excitation of oil mist beams to speed up oil gas uniform mixing.

Description

A kind of fuel spray nozzle that is used for premixed combustion of IC engine

Technical field:

The invention belongs to the field of fuel injection valve for internal combustion engines, be specially adapted to premixed combustion of IC engine.

Background technique:

Since the last century the nineties, countries in the world are more and more paid attention to environmental problem, particularly the internal-combustion engine as power train in vehicle application have been proposed the emission request of increasingly stringent.For example European Union member countries have worked out and have progressively improved Europe of requiring No. 1, No. 2, Europe, No. 3 Abgasgesetzs in Europe and following Europe No. 4 standards that will reach.The standard GB 17691-1999 of China requires to reach the emission limit that is equivalent to No. 2, No. 1, Europe and Europe respectively calendar year 2001 and 2005, estimates will implement soon European No. 3 Abgasgesetzs.When No. 3 Abgasgesetzs in Europe, the 7.0g/kW.h that the limit value of NOx is No. 2 from Europe is reduced to 5.0g/kW.h, and the 0.15g/kW.h that the limit value of PM is No. 2 from Europe is reduced to 0.1g/kW.h.The diesel engine main body belongs to typical diffusive combustion, determine the discharge value of its NOx and PM to want high than petrol engine, and both becomes the tradeoff relation.Therefore, for diesel engine, how reducing NOx and PM discharging simultaneously is a stubborn problem.For this reason, the advantages separately of petrol engine and diesel engine is got up in internal-combustion engine researcher attempt, starts a kind of new combustion manner---even thin pre-mixing combustion, when this kind combustion manner is implemented, just can accomplish to reduce simultaneously NOx and PM discharging on internal-combustion engine.For example, recent HCCI (the Homogeneous Charge Compression Ignition:Benefits that rises, Compromises, and Future Engine ApplicationsRudolfH.Stanglmaier SAE paper 1999-01-3682), MK combustion manners such as (NewCombustion Concept for Ultra-Clean and High-Efficiency SmallDI Diesel Engines Shuji Kimura SAE paper 1999-01-3681) just belongs to the even thin premixed combustion mode of this kind.But pre-mixing combustions such as existing HCCI, MK also exist: therefore wayward, the problem such as fuel consumption rate is high, HC and CO discharging is high, range of operation is narrow of the difficult preparation of thin even hot mixed gas, combustion phase still have distance from practical application.

Summary of the invention:

The purpose of this invention is to provide a kind of novel oil nozzle that is applicable to premixed combustion of IC engine.This fuel spray nozzle can be prepared thin uniform hot mixed gas for internal-combustion engine, makes internal-combustion engine realize that thin uniform warm premixing closes gas firing, reduces NOx and PM discharging simultaneously.

The technical solution adopted in the present invention is a kind of fuel spray nozzle that is used for internal-combustion engine realization pre-mixing combustion of exploitation.It mainly comprises needle-valve (1), needle-valve body (2), and its major character is: a. is positioned at needle-valve body (2) head bilayer or multilayer spray orifice; B. the spray cone angle of lower floor's spray orifice is greater than the spray cone angle (α 2＞α 1) of upper strata spray orifice.

The present invention compares the beneficial effect that is had with prior art: because the spray cone angle of lower floor's spray orifice is greater than the spray cone angle of upper strata spray orifice, make two bundle mist of oils in bags intersection, avoid with cylinder wall or with the chamber wall direct collision, and can strengthen the disturbance of oil bundle, quickening oil gas mixes equably, realize the homogeneous pre-mixing combustion for internal-combustion engine, prepared necessary thin uniform warm premixing and closed gas.

Description of drawings:

Fig. 1 is a kind of sectional drawings that are used for the fuel spray nozzle of premixed combustion of IC engine of embodiments of the invention.

Fig. 2 is an embodiments of the invention oil nozzle fundamental diagram.

Fig. 3 and Fig. 4 are prior art and enforcement comparison diagram of the present invention.

Embodiment:

Below in conjunction with description of drawings the specific embodiment of the present invention.

Fig. 1 and Fig. 2 are a kind of sectional drawings that are used for the fuel spray nozzle of premixed combustion of IC engine of embodiments of the invention.Fuel pressure in oil nozzle oil holding slot (3) raises, and when acting on spring (6) power on needle-valve (1) top, needle-valve (1) leaves the seat surface (4) on the needle-valve body (2) and upwardly opens, and fuel oil sprays to firing chamber (5) from the two-layer spray orifice up and down of oil nozzle simultaneously.Two bundle oil bundles had both been avoided the collision of oily bundle and combustion chamber wall surface or cylinder wall in bags intersection so up and down; Can strengthen simultaneously the disturbance of two strands of oil bundles again, promote the even mixing of oil gas.

Fig. 3 and Fig. 4 are prior art and enforcement comparison diagram of the present invention.Have only the individual layer spray orifice in the prior art, even its bilevel two strands of oil bundles of double-deck spray orifice are perhaps arranged in also not intersection of space, so oily bundle might collide with combustion chamber wall surface or cylinder wall, causes that HC, CO discharge increase.The present invention adopts the oil nozzle of two-layer spray orifice up and down, and the spray cone angle of lower floor's spray orifice is greater than the spray cone angle of upper strata spray orifice, make that two strands of oil bundles are in space intersection up and down, both avoided the collision of oily bundle and wall, can strengthen the disturbance of two strands of oil bundles again, promote the even mixing of oil gas, for pre-mixing combustion has been prepared thin uniform hot mixed gas.

Claims

1, a kind of fuel spray nozzle that is used for premixed combustion of IC engine.It mainly comprises needle-valve (1), needle-valve body (2), and its major character is:

A. be positioned at needle-valve body (2) head bilayer or multilayer spray orifice are arranged; B. the spray cone angle of lower floor's spray orifice is greater than the spray cone angle (α 2＞α 1) of upper strata spray orifice.

2, the fuel spray nozzle that is used for premixed combustion of IC engine according to claim 1 is positioned at cylinder head or suction tude.