CN102926904A - Elongated oil nozzle for small bore swirl chamber diesel engine - Google Patents
Elongated oil nozzle for small bore swirl chamber diesel engine Download PDFInfo
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- CN102926904A CN102926904A CN2012104318033A CN201210431803A CN102926904A CN 102926904 A CN102926904 A CN 102926904A CN 2012104318033 A CN2012104318033 A CN 2012104318033A CN 201210431803 A CN201210431803 A CN 201210431803A CN 102926904 A CN102926904 A CN 102926904A
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Abstract
The invention discloses an elongated oil nozzle for a small bore swirl chamber diesel engine. The elongated oil nozzle for the small bore swirl chamber diesel engine comprises a needle valve body and a needle valve, wherein a compression fitting surface of an oil nozzle and an oil injector cap nut is arranged below the bottom portion of an oil storage tank, the distance L1 between the lower edge of a pressure-containing conical surface of the needle valve and the upper edge of a sealing conical surface of the oil nozzle is above 12mm, the difference between the inner diameter of the needle valve body and the outer diameter of the needle valve is about 1mm in the distance to form an oil channel from the oil storage slot to an oil jet hole, the diameter d2 of the lower portion of the needle valve body is from 7mm to 9mm, and the diameter d3 of the needle valve is from 4mm to 6mm, thereby meeting use requirement of a swirl-chamber diesel engine which has a cylinder diameter below 80mm. When the oil nozzle is arranged and used on a diesel engine, the direct contact area of the lower portion of the needle valve body in a diesel engine swirl chamber with gas is small, the needle valve is cooled by oil flowing in the oil nozzle, the heat which is transported to axial sealing surfaces of the needle valve and the needle valve body is reduced, and the elongated oil nozzle for the small swirl chamber diesel engine solves the problem that the needle valve is blocked in the needle valve body because of overheating.
Description
Technical field
The present invention relates to little cylinder diameter swirl chamber diesel, relating in particular to cylinder diameter is the single-cylinder air-cooled swirl chamber diesel oil nozzle of 60-80 millimeter.
Background technique
China's small diesel engine industry output is large, occupies first of the world.The small-bore diesel engine of cylinder diameter≤80mm wherein, output is above 2,000,000.What most small-bore diesel engines adopted is the firing chamber, vortex chamber, employing be the short profile shaft pin type oil nozzle (see figure 2) that the single cylinder diesel of early stage larger cylinder diameter mates.The type oil nozzle uses at small-bore diesel engine and has following defective: the one, and needle-valve and needle-valve body motion guide fitting surface are the conical surface and the spray orifice of the comparatively close sealed seat surface of axial seal face, little cylinder diameter swirl chamber diesel is subjected to air cylinder head structure and size restrictions, it is higher to reach oil sprayer installation place heat load around the vortex chamber, the outer cylinder diameter of short profile shaft pin type oil nozzle bottom spray orifice is 14mm, larger with the firing chamber area of contact, particularly at oil sprayer the basifacial oil nozzle of sealing being installed all directly contacts with high-temperature fuel gas in the firing chamber, heat directly is delivered to the Spielpassung of needle-valve and needle-valve body axial seal face from head combustion chamber, its cooperation place non-uniform temperature or surpass the oil nozzle normal working temperature gap, needle-valve axial seal fitting surface place is changed, be stuck fault in needle-valve body of needle-valve occurs, oil nozzle is killed the functional reliability that has had a strong impact on diesel engine; The 2nd, the diesel engine cylinder diameter is little, and vortex chamber's volume is little, and vortex chamber's diameter is suitable with short profile shaft pin type oil nozzle head outer cylinder diameter, and both pass through vortex chamber's out-of-shape mutually, and the gas flow resistance is large, forms the eddy current ability and is affected, and harmful volume increases; The 3rd, the injector valve head dimensions is unreasonable concerning the small displacement diesel engine, causes the injection process needle-valve all not open, the idle stability of diesel engine and engine fuel economy, discharging, combustion noise mis-behave.Above-mentioned factor makes the diesel emission batch production can not reach the existing limited value of discharge standard of China, the oil nozzle of oil sprayer is killed phenomenon and is taken place frequently, and diesel engine performance is poor, can not satisfy the requirement of energy-saving and emission-reduction, the raising of puzzlement China small-bore diesel engine quality of product has been an industry difficult problem anxious to be resolved.
Problem for small diesel engine, the oil nozzle of small-bore diesel engine is carried out structural analysis to the inventor and the diesel engine performance relation is analyzed and researched, it has been carried out structure innovation, can reduce the diesel engine heat load to the impact of pintle nozzle match-ing parts, can solve the overheated problem of killing of causing of oil nozzle, can reduce simultaneously diesel emission, improve Economy, can improve the performance of little cylinder diameter swirl chamber diesel engine.
Summary of the invention
Target of the present invention provides a kind of little cylinder diameter swirl chamber diesel extended type pintle nozzle, solves that present swirl chamber diesel engine emission performance is poor, less economical, the poor technical problem of the easy stuck whole aircraft reliability of oil nozzle.
The present invention changes the compression fit face position of oil nozzle and the tight cap of oil sprayer, compares with the pintle nozzle original structure of present use, oil sprayer is installed the bottom that moves on to oil holding slot on the seal face; Increase the length of needle-valve body and needle-valve, with the axial seal cooperation position of the needle-valve of oil nozzle and needle-valve body than the cooperation position of former oil sprayer further from the injection hole on injection nozzle head, the length of the former axle type oil nozzle of Length Ratio on edge is long on the lower edge of the pressure-bearing conical surface and the oil nozzle sealing cone, the axial seal fitting surface is away from the heat transfer source of firing chamber, there is in addition larger gap (more than the 0.5mm) to provide fuel oil to flow to the passage at nozzle opening place between the following needle-valve of oil holding slot and needle-valve body, during engine operation, the fuel oil that flows cools off needle-valve, and the oil nozzle part heat load near the place, firing chamber reduces greatly like this; After moving on the axial seal cooperation position of needle-valve and needle-valve body, needle-valve body bottom excircle dimension be reduced to full-sized near half, install in cylinder head, oil nozzle bottom surface and firing chamber contacts fuel gas area reduce, so that the firing chamber combustion gas reduces to original 25～41.3% to the bottom surface heating area of oil nozzle, the heat that is delivered to needle-valve and needle-valve body also will reduce, the benefit of this invention is that injector valve and needle-valve body couple heat load reduce, can obviously reduce the stuck failure problems at needle-valve body of needle-valve, oil nozzle is stuck to be one of the most incident fault of present swirl chamber diesel engine.
The present invention specifically comprises needle-valve body, needle-valve, the identical and Spielpassung of external diameter on the internal diameter on needle-valve body top and needle-valve top, the axial seal face of formation high pressure fuel; The oil nozzle sealing cone of the cone of needle-valve body bottom and needle-valve bottom cone formation control high pressure fuel injection, the distance L 1 on edge makes axial seal face away from the compression fit face of the tight cap of oil sprayer and the high-temperature fuel gas of burning chamber of diesel engine more than 12mm on the lower edge of the pressure-bearing conical surface of the needle-valve of the needle-valve of described lengthening oil nozzle and the oil nozzle sealing cone; The length inner needle valve body internal diameter on edge is than the large 0.9-1.1mm of needle-valve external diameter on the lower edge of the pressure-bearing conical surface of needle-valve and oil nozzle sealing cone, form oil holding slot to the fuel gallery of oil nozzle head spray orifice, the compression fit face of oil nozzle and the tight cap of oil sprayer is below the oil holding slot bottom, and the needle-valve body lower outer diameter d2 of oil nozzle is at 7～9mm.
After moving on the axial seal cooperation position of needle-valve and needle-valve body, needle-valve body bottom outside diameter size reduction to full-sized near half, oil sprayer is installed in cylinder head, oil nozzle bottom cylinder is little with the size that the firing chamber bulb passes through mutually, combustion-chamber shape has kept hemisphere, gas flow drag reduction in the firing chamber, strength of vortex increases, and benefit of the present invention is the improvement that is conducive to vortex chamber's gas flow capability.
The compression fit face of oil nozzle and the tight cap of oil sprayer is below the oil holding slot bottom, the axial seal face of making is away from the high-temperature fuel gas of burning chamber of diesel engine, away from the compression fit face of oil nozzle and the tight cap of oil sprayer, the gap portion of oil nozzle axial seal face is little when diesel engine is worked, and avoids or reduces the stuck phenomenon of oil nozzle; The bottom cylinder diameter d2 that reduces the close spray orifice in needle-valve body bottom is nearly half value of former oil nozzle bottom cylinder diameter, reduces the burning chamber of diesel engine high-temperature fuel gas to the heat that adds of oil nozzle.Size below the oil nozzle head seal conical surface is designed, according to fuel oil actual internal area and the needle lift of Fuel Injection Quantity for Diesel and oil injection duration design needs.
Progress along with the diesel combustion technology, direct injection combustion chamber develops to little cylinder diameter, more than 100mm, use straight spray firing chamber from early stage cylinder bore, cylinder diameter has the structure of straight spray firing chamber about 70mm up till now, just present domestic diesel engine manufacturing technology level, the diesel engine cylinder diameter of batch production adopts direct injection combustion more than 80mm be feasible, and batch production can be satisfied the current standard requirement of national fuel oil consumption, discharging simultaneously; But for the diesel engine of cylinder diameter below 80mm, particularly only can reduce by emission controls by improving combustion the single cylinder diesel of discharging, adopting turbulence chamber is the feasible way that the diesel engine that reaches batch production satisfies the existing index limits such as discharging, fuel oil consumption.Turbulence chamber adopts axial needle type injector, mostly the oil sprayer of present domestic batch production is take early stage displacement volume as 0.8L diesel engine structural design more than (more than the cylinder diameter 95mm) with oil nozzle, it is just unreasonable that this oil nozzle is used for cylinder diameter 60-80mm diesel engine, only be 0.2-0.25L such as cylinder diameter 70mm type displacement volume, fuel injection quantity greatly reduces greater than 0.8L discharge capacity type, it only is 1/3～1/4 demarcation fuel injection quantity, therefore the present invention carries out structural design to oil nozzle head spray orifice size, require the suitable dimensional parameters of design oil nozzle flow according to fuel injection quantity and oil injection duration, so the present invention can make diesel engine performance optimized.
Description of drawings
Fig. 1 is oil nozzle structural representation of the present invention.
Fig. 2 is former oil nozzle structural representation.
Among the figure: 1. needle-valve body, 2. needle-valve, 3. oil holding slot, 4. needle-valve body and needle-valve axial seal face, the 5. compression fit face of oil nozzle and tight cap, the 6. sealing cone of oil nozzle, the 7. pressure-bearing conical surface, 8 needle-valve body bottom end faces.
Embodiment
The invention process is that 60～80mm swirl chamber diesel supports the use oil nozzle as example take cylinder bore.This oil nozzle is carried out following innovative design, and its structure is seen Fig. 1: the compression fit face 5 of oil nozzle and the tight cap of oil sprayer is moved to oil holding slot 3 lower end surfaces, L2=25mm, d1=17mm; Increase the length of needle-valve body 1, d2=7～9mm, increase simultaneously the length of needle-valve 2, about L1=12～18mm, L3 length is according to L1 size proportioning, and the length that the length that needle-valve 2 increases and needle-valve body 1 increase is harmonious, needle-valve body bottom end face 7 directly contacts with the combustion gas of firing chamber, vortex chamber, compare with oil nozzle with former machine, the area of bottom end face 8 only is intrinsic 25～41.3%, greatly reduces from the firing chamber the heat transfer area of oil nozzle.The axial fitting surface 4 of needle-valve and needle-valve body is away from needle-valve body bottom end face 8 like this, and fuel flow arranged to needle-valve and needle-valve body cooling, the possibility elimination that oil nozzle is stuck between the sealing cone 6 of needle-valve body and needle-valve axial seal face 4 and oil nozzle.Press the oil nozzle of the present invention's design in the diesel engine bench process of the test, do not find so far the oil nozzle stuck phenomenon.
Cylinder bore is that 60～80mm swirl chamber diesel declared working condition circulating fuel injection quantity is at 8.5～23mm
3/ circulation, the oil injection duration of diesel engine about 20 Shaft angle of writing music can draw thus maximum how much circulation areas of oil nozzle and should be not more than 0.18mm
2, and how much circulation areas of the oil nozzle that existing market is used all surpass 0.30 mm
2, and maximum how much circulation areas of the most frequently used ZS4S1 oil nozzle are up to 0.47mm
2, cause during the result uses that the diesel engine smoke intensity is large, noise is high, unstable idle.By the oil nozzle of the present invention's design, test result shows on the 170F diesel engine: diesel engine declared working condition fuel consumption rate decline 16g/kWh, and more than the smoke intensity decline 2FSU, idling performance obviously improves, and discharging has also reached existing NBS requirement.
Claims (3)
1. one kind little cylinder diameter swirl chamber diesel extended type oil nozzle, it is characterized in that, consisted of the identical and Spielpassung of external diameter on the internal diameter on needle-valve body (1) top and needle-valve (2) top, the axial seal face (4) of formation high pressure fuel by needle-valve body (1) and needle-valve (2); The oil nozzle sealing cone (6) of the cone of needle-valve body (1) bottom and needle-valve (2) bottom cone formation control high pressure fuel injection, the distance L 1 on the upper edge of the lower edge of the pressure-bearing conical surface (7) of the needle-valve (2) of the needle-valve of described lengthening oil nozzle (2) and oil nozzle sealing cone (6) makes axial seal face (4) away from the compression fit face (5) of the tight cap of oil sprayer and the high-temperature fuel gas of burning chamber of diesel engine more than 12mm; At length inner needle valve body (1) internal diameter on the lower edge of the pressure-bearing conical surface (7) of needle-valve (2) and the upper edge of oil nozzle sealing cone (6) than the large 0.9-1.1mm of needle-valve (2) external diameter, form oil holding slot (3) to the fuel gallery of oil nozzle head spray orifice, the compression fit face (5) of oil nozzle and the tight cap of oil sprayer is below oil holding slot (3) bottom, and the needle-valve body lower outer diameter d2 of oil nozzle is at 7～9mm.
2. according to claims 1 described a kind of little cylinder diameter swirl chamber diesel extended type oil nozzle, it is characterized in that: the diameter d 3 of described needle-valve 2 satisfies the following swirl chamber diesel engine of cylinder diameter 80mm and uses at 4～6mm.
3. according to claims 1 described a kind of little cylinder diameter swirl chamber diesel extended type oil nozzle, it is characterized in that: described oil nozzle head spray orifice size d4 is at 0.8～1.0mm; Make oil nozzle how much circulation areas when maximum lift be not more than 0.18mm
2, satisfy the requirement of the following swirl chamber diesel engine of cylinder diameter 80mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104318033A CN102926904A (en) | 2012-11-02 | 2012-11-02 | Elongated oil nozzle for small bore swirl chamber diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104318033A CN102926904A (en) | 2012-11-02 | 2012-11-02 | Elongated oil nozzle for small bore swirl chamber diesel engine |
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| CN102926904A true CN102926904A (en) | 2013-02-13 |
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| CN2012104318033A Pending CN102926904A (en) | 2012-11-02 | 2012-11-02 | Elongated oil nozzle for small bore swirl chamber diesel engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989573A (en) * | 2015-07-16 | 2015-10-21 | 江苏大学 | Long short-structured oil sprayer for vortex chamber type diesel engine |
| CN105065166A (en) * | 2015-08-12 | 2015-11-18 | 江苏大学 | Needle valve of diesel engine oil nozzle , needle valve coupling piece and needle valve machining method |
| CN106677945A (en) * | 2016-07-12 | 2017-05-17 | 江西汇尔油泵油嘴有限公司 | Segmented oil spraying oil nozzle and segmented oil spraying method |
| CN109404192A (en) * | 2019-01-08 | 2019-03-01 | 北油电控燃油喷射系统(天津)有限公司 | A kind of electronic fuel injection and the fuel injector including it |
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| GB2223799A (en) * | 1988-10-11 | 1990-04-18 | Lucas Ind Plc | I.C. engine fuel injection nozzle |
| CN2413041Y (en) * | 2000-03-22 | 2001-01-03 | 袁辉 | Rotary needle-valve type injector |
| CN1644915A (en) * | 2005-01-26 | 2005-07-27 | 周书田 | Multi-orifice pencil-style fuel injectors |
| CN201025200Y (en) * | 2007-04-16 | 2008-02-20 | 中国南车集团戚墅堰机车车辆厂 | Pin valve coupling part for oil sprayer |
| CN102374084A (en) * | 2011-09-20 | 2012-03-14 | 福建省莆田市中涵机动力有限公司 | Static non-leakage high pressure common-rail injector |
| CN203067143U (en) * | 2012-11-02 | 2013-07-17 | 江苏大学 | Lengthened type oil nozzle for small-cylinder-diameter swirl chamber type diesel engine |
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2012
- 2012-11-02 CN CN2012104318033A patent/CN102926904A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2223799A (en) * | 1988-10-11 | 1990-04-18 | Lucas Ind Plc | I.C. engine fuel injection nozzle |
| CN2413041Y (en) * | 2000-03-22 | 2001-01-03 | 袁辉 | Rotary needle-valve type injector |
| CN1644915A (en) * | 2005-01-26 | 2005-07-27 | 周书田 | Multi-orifice pencil-style fuel injectors |
| CN201025200Y (en) * | 2007-04-16 | 2008-02-20 | 中国南车集团戚墅堰机车车辆厂 | Pin valve coupling part for oil sprayer |
| CN102374084A (en) * | 2011-09-20 | 2012-03-14 | 福建省莆田市中涵机动力有限公司 | Static non-leakage high pressure common-rail injector |
| CN203067143U (en) * | 2012-11-02 | 2013-07-17 | 江苏大学 | Lengthened type oil nozzle for small-cylinder-diameter swirl chamber type diesel engine |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989573A (en) * | 2015-07-16 | 2015-10-21 | 江苏大学 | Long short-structured oil sprayer for vortex chamber type diesel engine |
| CN105065166A (en) * | 2015-08-12 | 2015-11-18 | 江苏大学 | Needle valve of diesel engine oil nozzle , needle valve coupling piece and needle valve machining method |
| CN105065166B (en) * | 2015-08-12 | 2018-02-23 | 江苏大学 | Needle-valve, pintle nozzle match-ing parts and the needle-valve processing method of diesel injector |
| CN106677945A (en) * | 2016-07-12 | 2017-05-17 | 江西汇尔油泵油嘴有限公司 | Segmented oil spraying oil nozzle and segmented oil spraying method |
| CN106677945B (en) * | 2016-07-12 | 2019-07-05 | 江西汇尔油泵油嘴有限公司 | The atomizer of oil spout and stage by stage fuel injecting method stage by stage |
| CN109404192A (en) * | 2019-01-08 | 2019-03-01 | 北油电控燃油喷射系统(天津)有限公司 | A kind of electronic fuel injection and the fuel injector including it |
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Application publication date: 20130213 |