CN203067143U - Lengthened type oil nozzle for small-cylinder-diameter swirl chamber type diesel engine - Google Patents
Lengthened type oil nozzle for small-cylinder-diameter swirl chamber type diesel engine Download PDFInfo
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- CN203067143U CN203067143U CN 201220572632 CN201220572632U CN203067143U CN 203067143 U CN203067143 U CN 203067143U CN 201220572632 CN201220572632 CN 201220572632 CN 201220572632 U CN201220572632 U CN 201220572632U CN 203067143 U CN203067143 U CN 203067143U
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Abstract
The utility model discloses a lengthened type oil nozzle for a small-cylinder-diameter swirl chamber type diesel engine. The lengthened type oil nozzle comprises a needle valve body and a needle valve, and a force fit surface of the oil nozzle and an oil-atomizer tightening cap is located below the bottom of an oil containing tank; the distance L1 between the lower edge of the pressure-bearing conical surface of the needle valve and the upper edge of the sealing conical surface of the oil nozzle is greater than 12mm, the difference between the inner diameter of the needle valve body and the outer diameter of the needle valve is about 1mm within the distance, a fuel oil channel from the oil containing tank to an oil spraying hole is formed, the diameter d2 of the lower portion of the needle valve body ranges from 7mm to 9mm, the diameter d3 of the needle valve ranges from 4mm to 6mm, and the lengthened type oil nozzle can meet using requirements of the swirl chamber type diesel engine with the cylinder diameter which is less than 80mm. When the lengthened type oil nozzle is installed on the diesel engine for use, the direct contacting area between the lower portion of the needle valve body and gas inside a swirl chamber of the diesel engine is relatively small, flowing fuel oil in the oil nozzle cools the needle valve, heat transferred to the axial sealing surface of the needle valve and the axial sealing surface of the needle valve body is reduced, and the problem that the needle valve is blocked in the needle valve body caused by overheating is resolved.
Description
Technical field
The utility model relates to little cylinder diameter swirl chamber diesel, and 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 big, 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 big 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, bigger 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 big, forms the eddy current ability and is affected, and harmful volume increases; The 3rd, the injector valve head sizes is unreasonable concerning little capacity 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 is produced diesel emission in batches can not reach the existing emission standard limit value 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 solved.
Problem at 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 the structure innovative design, can reduce the diesel engine heat load to the influence 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 utility model 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 technical problem of the easy stuck whole aircraft reliability difference of oil nozzle.
The utility model 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 lower edge of the pressure-bearing conical surface is longer than the length of former axle type oil nozzle with the length of oil nozzle sealing cone upper edge, needle-valve body and needle-valve axial seal face are away from the heat transfer source of firing chamber, there is big gap (more than the 0.5mm) to provide fuel oil to flow to the passage at nozzle opening place in addition 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 portion of hot 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, make the firing chamber combustion gas reduce 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 model utility is that injector valve and needle-valve body idol part heat load reduce, can obviously reduce the stuck failure problems at needle-valve body of needle-valve, oil nozzle is stuck to be present swirl chamber diesel engine one of the most incident fault.
The utility model 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 cone of needle-valve body bottom and needle-valve bottom cone form the oil nozzle sealing cone of control high pressure fuel injection, the distance L 1 of the lower edge of the pressure-bearing conical surface of the needle-valve of described lengthening oil nozzle and oil nozzle sealing cone upper 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; At the length inner needle valve body internal diameter of the lower edge of the pressure-bearing conical surface of needle-valve and oil nozzle sealing cone upper edge than the big 0.9-1.1mm of needle-valve external diameter, 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.The diameter d 3 of described needle-valve satisfies the following swirl chamber diesel engine of cylinder diameter 80mm and uses at 4～6mm.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.
After moving on the axial seal cooperation position of needle-valve and needle-valve body, needle-valve body bottom outside diameter size be reduced 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, the gas flow resistance reduces in the firing chamber, and strength of vortex increases, and benefit of the present utility model 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.
Along with the diesel combustion development of 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 producing in batches adopts direct injection combustion more than 80mm be feasible, and batch process 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 the single cylinder diesel of discharging by emission controls by improving combustion, adopting turbulence chamber is the feasible way that the diesel engine that reaches batch process satisfies existing index limit values such as discharging, fuel oil consumption.Turbulence chamber adopts axial needle type injector, mostly the oil sprayer of present domestic batch process is that with oil nozzle with early stage displacement volume be the above diesel engine structural design of 0.8L (more than the cylinder diameter 95mm), it is just unreasonable that this oil nozzle is used for cylinder diameter 60-80mm diesel engine, only be 0.2-0.25L as cylinder diameter 70mm type displacement volume, fuel injection quantity significantly reduces greater than 0.8L discharge capacity type, it only is 1/3～1/4 demarcation fuel injection quantity, therefore the utility model 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 utility model can make diesel engine performance optimized.
Description of drawings
Fig. 1 is oil nozzle structural representation of the present utility model.
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
It is that the supporting oil nozzle that uses of 60～80mm swirl chamber diesel is example that the utility model is implemented with 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 the length of needle-valve 2 simultaneously, 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 8 directly contacts with the combustion gas of firing chamber, vortex chamber, compare with oil nozzle with former machine, the area of needle-valve body bottom end face 8 only is intrinsic 25～41.3%, greatly reduces from the firing chamber the heat transfer area of oil nozzle.Needle-valve body and needle-valve axial seal face 4 be away from needle-valve body bottom end face 8 like this, and fuel flow is arranged to needle-valve and needle-valve body cooling between the sealing cone 6 of needle-valve body and needle-valve axial seal face 4 and oil nozzle, and the stuck possibility of oil nozzle is eliminated substantially.Press the oil nozzle of the utility model design in the diesel engine bench process of the test, do not find the oil nozzle stuck phenomenon so far.
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 maximum how much circulation areas of oil nozzle thus 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 big, noise is high, unstable idle.Press the oil nozzle of the utility model 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, constituted the identical and Spielpassung of external diameter on the internal diameter on needle-valve body (1) top and needle-valve (2) top, needle-valve body and the needle-valve axial seal face (4) of formation high pressure fuel by needle-valve body (1) and needle-valve (2); The cone of needle-valve body (1) bottom and needle-valve (2) bottom cone form the oil nozzle sealing cone (6) of control high pressure fuel injection, the distance L 1 of the lower edge of the pressure-bearing conical surface (7) of the needle-valve of described lengthening oil nozzle (2) and oil nozzle sealing cone (6) upper edge makes needle-valve body and needle-valve 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 of the lower edge of the pressure-bearing conical surface (7) of needle-valve (2) and oil nozzle sealing cone (6) upper edge than the big 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. a kind of little cylinder diameter swirl chamber diesel extended type oil nozzle according to claim 1 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. a kind of little cylinder diameter swirl chamber diesel extended type oil nozzle according to claim 1, 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 |
|---|---|---|---|
| CN 201220572632 CN203067143U (en) | 2012-11-02 | 2012-11-02 | Lengthened type oil nozzle for small-cylinder-diameter swirl chamber type diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220572632 CN203067143U (en) | 2012-11-02 | 2012-11-02 | Lengthened type oil nozzle for small-cylinder-diameter swirl chamber type diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203067143U true CN203067143U (en) | 2013-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220572632 Expired - Fee Related CN203067143U (en) | 2012-11-02 | 2012-11-02 | Lengthened type oil nozzle for small-cylinder-diameter swirl chamber type diesel engine |
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| CN (1) | CN203067143U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926904A (en) * | 2012-11-02 | 2013-02-13 | 江苏大学 | Elongated oil nozzle for small bore swirl chamber diesel engine |
| 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 |
-
2012
- 2012-11-02 CN CN 201220572632 patent/CN203067143U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926904A (en) * | 2012-11-02 | 2013-02-13 | 江苏大学 | Elongated oil nozzle for small bore swirl chamber diesel engine |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20151102 |
|
| EXPY | Termination of patent right or utility model |