CN204476545U - Straight-wall double-swirl combustion chamber of diesel engine - Google Patents
Straight-wall double-swirl combustion chamber of diesel engine Download PDFInfo
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- CN204476545U CN204476545U CN201520030368.2U CN201520030368U CN204476545U CN 204476545 U CN204476545 U CN 204476545U CN 201520030368 U CN201520030368 U CN 201520030368U CN 204476545 U CN204476545 U CN 204476545U
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 37
- 230000007704 transition Effects 0.000 claims abstract description 25
- 238000010304 firing Methods 0.000 claims description 35
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 11
- 239000003921 oil Substances 0.000 description 22
- 239000000295 fuel oil Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
A straight-wall double-swirl combustion chamber of a diesel engine is characterized in that the axial section of the combustion chamber is omega-shaped, and comprises an upper flow guide part, a throat opening, a lower flow guide part and a spherical crown-shaped boss which are sequentially connected from the top of a piston to the bottom of the combustion chamber, wherein the throat opening comprises a first flow guide platform, an arc transition section and a second flow guide platform which are sequentially connected from top to bottom, the first flow guide platform is of an inverted cone platform structure, the included angle between the section of the inner wall of the first flow guide platform and the top surface of the piston is 14-16 degrees, the ratio of the inner diameter of the upper end surface of the first flow guide platform to the diameter of the top surface of the first flow guide platform is 0.7-0.74, the second flow guide platform is of a cylindrical structure, the section of the inner wall of the first flow guide platform is parallel to the axis of the piston, the ratio of the inner diameter of. The design not only improves the thermal fatigue reliability of the piston throat, but also enables the engine to have better fuel economy and emission characteristics.
Description
Technical field
The utility model relates to technical field of engines, particularly relates to the two swirl combustion chamber of the straight wall of a kind of diesel engine, is specifically applicable to improve the thermal fatigue reliability of piston aditus laryngis and the fuel consumption and emission characteristic of motor.
Background technique
Modern directly jetting turbo charging burning chamber of diesel engine is generally the toroidal combustion chamber of band reducing, is made up of combustion chamber throat, firing chamber arc surface and central boss.High pressure fuel injects directly on combustion chamber throat position, entrainment to center, firing chamber under the guide functions of firing chamber arc surface, the fresh air in combustion recess can be made full use of, but cannot compared with the fresh air of good utilisation piston top gap part, in cylinder, air utilization ratio is lower, burning tissues difficulty, the thermal efficiency also can be lower.In addition, along with the raising of diesel engine strengthening degree, the heat load of piston significantly promotes, and therefore has higher requirement to the reliability of piston.
Chinese patent: application publication number is CN103696870A, Shen Qing Publication day is that the patent of invention on April 2nd, 2014 discloses a kind of cylinder of diesel engine piston, its end face has the firing chamber of axial cross section external frame in " ω " font, stretch in the arc ridge of cavity volume in the outside inwall of firing chamber has, give prominence to the radial direction of arc ridge the tangent line that peak formed and divide firing chamber for inner side regular zone and groove area; The aditus laryngis outer place of firing chamber has groove, and to form the buffer area be communicated with groove area, the external frame of buffer area is asymptotic Long-term change trend from groove area to piston-top surface.Although this invention is by the structure optimization to firing chamber, eddy current trend can be adjusted, at the satisfied raising thermal efficiency, reduce on the basis of oil consumption, effectively can evade the higher problem of cylinder cover bottom surface heat load, but still there is following defect:
1, in this invention, the aditus laryngis of firing chamber is 8 ° – 10 ° by the angle of straightway 4(and horizontal plane), straightway 6(and the angle of horizontal plane are 65 ° – 75 °) and be connected the circular arc that straightway 4 and the radius of straightway 6 are 4 – 5mm and form, and the outstanding peak of its arc ridge radial direction to the distance 1 of piston centreline is only 0.7 – 0.75 with the ratio of the maximum diameter L of firing chamber regular zone A, aditus laryngis arc ridge is outstanding obviously to combustion chamber, therefore the distance inside aditus laryngis and between piston cooling oil passage is larger, this design can make the hot area of aditus laryngis in combustion process enlarge markedly, easily cause aditus laryngis heat load too high and lost efficacy, cause piston aditus laryngis oxidative exfoliation or aditus laryngis problems of crack, thus affect the reliability of piston.
Summary of the invention
The purpose of this utility model overcomes the poor problem of the thermal fatigue reliability of the aditus laryngis existed in prior art, provides a kind of two swirl combustion chamber of the straight wall of diesel engine that significantly can improve the thermal fatigue reliability of aditus laryngis.
For realizing above object, the technical solution of the utility model is as follows:
The two swirl combustion chamber of the straight wall of a kind of diesel engine, the axial profile of this firing chamber is ω font, comprise the upper diversion division, aditus laryngis, the lower diversion division that are connected successively by the top of piston to bottom of combustion chamber, described aditus laryngis comprises the diversion platform, arc transition section, No. two diversion platforms that connect successively from top to bottom;
Described No. two diversion platforms are cylindrical structural, the tangent plane of its inwall and the axis being parallel of piston, and the ratio being positioned at the maximum inner diameter of aditus laryngis lower area in the internal diameter of No. two diversion platforms and firing chamber is 0.97 – 0.99.
A described diversion platform is rounding frustum structure, and the angle of the tangent plane of its inwall and the end face of piston is 14 ° of – 16 °.
The ratio of the upper-end surface internal diameter of a described diversion platform and the diameter of end face is 0.7 – 0.74.
Described upper diversion division is the ring-type arc-shaped convex that internal diameter from top to bottom successively decreases, and its upper end is connected with end face, and lower end is connected with the upper end of a diversion platform by the arc transition groove of opening towards end face.
The bottom center of described firing chamber is provided with spherical crown shape boss.
Described lower diversion division is the arc groove of opening towards end face, and its upper end is connected by the lower end of arc transition boss with No. two diversion platforms, and lower end is connected with the border, bottom surface of spherical crown shape boss.
Compared with prior art, the beneficial effects of the utility model are:
1, in the two swirl combustion chamber of the straight wall of a kind of diesel engine of the utility model, No. two diversion platforms are cylindrical structural, the tangent plane of its inwall and the axis being parallel of piston, and the ratio being positioned at the maximum inner diameter of aditus laryngis lower area in the internal diameter of No. two diversion platforms and firing chamber is 0.97 – 0.99, the straight wall construction parallel with piston axis is designed to by aditus laryngis place, and enlarge markedly the internal diameter at aditus laryngis place and the ratio of firing chamber regular zone maximum inner diameter, not only significantly reduce the hot area of aditus laryngis, and the distance reduced with piston cooling oil passage inside aditus laryngis, the temperature of piston aditus laryngis in combustion process can be reduced to about 90 DEG C by this design, significantly improve the heat load of piston aditus laryngis, thus effectively improve the thermal fatigue reliability of aditus laryngis.Therefore, the utility model significantly improves the thermal fatigue reliability of aditus laryngis.
2, in the two swirl combustion chamber of the straight wall of a kind of diesel engine of the utility model, a diversion platform is rounding frustum structure, the tangent plane of its inwall and the angle of piston-top surface are 14 ° – 16 °, namely larger angle and upper diversion division is adopted to carry out transition, make the axial height of a diversion platform larger, oil burning jet can be better stoped to be mapped on cylinder sleeve wall, effectively prevent the generation of burn oil phenomenon, simultaneously, this design can allow the oil nozzle adopting larger angle between spray orifices under identical oil nozzle setting height(from bottom), thus obtain better fuel consumption and emission characteristic, or the setting height(from bottom) of oil nozzle is reduced when adopting the oil nozzle of identical angle between spray orifices, less oil nozzle setting height(from bottom) can shorten the length that oil nozzle stretches out firing chamber, reduce oil nozzle heat load and spray orifice coking risk, and then improve reliability and the working life of oil nozzle.Therefore, the utility model can not only avoid the generation of burn oil phenomenon, and Economy and reliability higher.
3, in the two swirl combustion chamber of the straight wall of a kind of diesel engine of the utility model, the internal diameter of a diversion platform upper-end surface and the ratio of piston-top surface diameter are 0.7 – 0.74, namely less relative aperture is adopted, make to produce stronger Inlet Swirl at compression top center and squeeze stream, accelerate the mixing of oil gas, obtain evenly inflammable mixture and velocity of combustion faster, thus obtain better fuel consumption and emission, simultaneously, upper diversion division is the ring-type arc-shaped convex that internal diameter from top to bottom successively decreases, its upper end is connected with piston-top surface, lower end is connected with the upper end of a diversion platform by the arc transition groove of opening towards piston-top surface, namely going up diversion division is interior throat structure, a diversion platform directly adopts arc transition to be connected with piston-top surface, without the need to setting up buffer area, this design not only can prevent fuel oil to be directly injected on cylinder sleeve, reduce the heat load of cylinder sleeve and the risk of burn oil, and make the volume of firing chamber regular zone larger, the fuel oil in main injection region has more fresh air to utilize, thus obtain better mixing uniformity, there is better fuel consumption and emission characteristic, in addition, the bottom center of firing chamber is provided with spherical crown shape boss, namely central boss adopts ball coronal structure, compared with cone boss structure, spherical crown shape boss slope is less, is conducive to fuel oil and the flame Center Extender to firing chamber, and forms central boss water conservancy diversion and bottom circular arc water conservancy diversion two strands of water conservancy diversion simultaneously, make the utilization of fresh air and air-fuel mixture better, thus obtain better fuel consumption and emission.Therefore, the utility model can obtain preferably fuel consumption and emission characteristic.
Accompanying drawing explanation
Fig. 1 is STRUCTURE DECOMPOSITION schematic diagram of the present utility model.
Fig. 2 is the close-up schematic view of A in Fig. 1.
Fig. 3 is that the air-flow in firing chamber moves towards schematic diagram.
In figure: upper diversion division 1, aditus laryngis 2, diversion platform 21, arc transition section 22, No. two diversion platforms 23, lower diversion division 3, arc transition groove 4, spherical crown shape boss 5, arc transition boss 6, piston 7, the inwall tangent plane of end face 71, diversion platform and the angle α of piston-top surface.
Embodiment
Illustrate below in conjunction with accompanying drawing and with embodiment, the utility model to be described in further detail.
See Fig. 1 to Fig. 3, the two swirl combustion chamber of the straight wall of a kind of diesel engine, the axial profile of this firing chamber is ω font, comprise the upper diversion division 1, aditus laryngis 2, the lower diversion division 3 that are connected successively by the top of piston 7 to bottom of combustion chamber, described aditus laryngis 2 comprises a diversion platform 21, arc transition section 22, No. two diversion platforms 23 of connecting successively from top to bottom;
Described No. two diversion platforms 23 are cylindrical structural, the tangent plane of its inwall and the axis being parallel of piston 7, and the ratio being positioned at the maximum inner diameter of aditus laryngis 2 lower area in the internal diameter of No. two diversion platforms 23 and firing chamber is 0.97 – 0.99.
A described diversion platform 21 is rounding frustum structure, and the angle α of the tangent plane of its inwall and the end face 71 of piston 7 is 14 ° of – 16 °.
The ratio of the upper-end surface internal diameter of a described diversion platform 21 and the diameter of end face 71 is 0.7 – 0.74.
The ring-type arc-shaped convex that described upper diversion division 1 from top to bottom successively decreases for internal diameter, its upper end is connected with end face 71, and lower end is connected with the upper end of a diversion platform 21 by the arc transition groove 4 of opening towards end face 71.
The bottom center of described firing chamber is provided with spherical crown shape boss 5.
Described lower diversion division 3 is the arc groove of opening towards end face 71, and its upper end is connected by the lower end of arc transition boss 6 with No. two diversion platforms 23, and lower end is connected with the border, bottom surface of spherical crown shape boss 5.
Principle of the present utility model is described as follows:
In the utility model, the design of a diversion platform 21 strengthens the utilization to piston bottom clearance part fresh air, facilitates the uniformity of fuel oil space distribution in engine cylinder, can improve fuel economy, reduces the generation of noxious emission; The interior reducing design of upper diversion division 1 can prevent fuel oil to be directly injected to cylinder sleeve, reduces the heat load of cylinder sleeve and the risk of burn oil; The design of No. two diversion platforms 23, while stream effect is squeezed by maintenance toroidal combustion chamber, significantly can increase the heat diffusion area of combustion chamber throat, and combustion chamber throat is to the distance of piston cooling oil passage, thus is significantly reduced the heat load of piston aditus laryngis; Namely this firing chamber can reach the object reducing oil consumption and discharge, significantly can reduce the heat load of piston aditus laryngis simultaneously, improves the reliability of piston.Air-flow in firing chamber specifically moves towards as follows:
The top of combustion chamber throat 2 is a diversion platform 21, bottom is No. two diversion platforms 23, the fuel oil being ejected into arc transition section 22 forms two-way air motion, one tunnel is upwards entrainmented in formation entrainment stream along a diversion platform 21, arc transition groove 4, upper diversion division 1 successively, combination gas (fired and do not fired) is by the region of entrainmenting to piston-top surface 71 and cylinder cover bottom surface, this part fresh air is fully utilized, and internal combustion oil of cylinder space distribution is more even; Another road is then entrainmented along No. two diversion platforms 23, arc transition boss 6, lower diversion division 3, spherical crown shape boss 5 to center, firing chamber successively, entrainments stream under formation.Under entrainment and flow to and reach spherical crown shape boss 5 before, combination gas (fired and do not fired) occurs to flow to and is separated, major part combination gas is involved in the comparatively sufficient region of firing chamber upper air after lower diversion division 3, form bottom circular arc water conservancy diversion, remaining combination gas then comes together in its top along spherical crown shape boss 5 after lower diversion division 3, under the drainage of lower diversion division 3, remaining combination gas is obviously strengthened with spherical crown shape boss 5 top mixing of air, and the combustion process of therefore this part combination gas is also more complete.
As preferably of the present utility model, the maximum diameter of described upper diversion division 1 is 46.2 – 46.4mm, the radius of arc of upper diversion division 1 is 0.75 – 0.8mm, the center of circle of this circular arc and the distance of end face 71 are 0.9 – 1mm, a diversion platform 21 is 46.2 – 46.4mm, the circular arc center of circle of arc transition section 22 and the distance of end face 71 are 6.5 – 6.7mm, the radius of arc of lower diversion division 3 is 8 – 8.2mm, its circular arc center of circle is 31 – 31.3mm to the distance of the medial axis of piston 7, the circular arc center of circle is 11.9 – 12mm to the distance of end face 71, the radius of arc of arc transition groove 4 is for being 1 – 1.2mm, , the bottom surface radius of spherical crown shape boss 5 can be 57 – 58mm, the top of spherical crown shape boss 5 and the distance of end face 71 are 11.8 – 11.9mm, the radius of arc of arc transition boss 6 is for being 3 – 3.2mm, molten the amassing of firing chamber is 85.5 – 85.7mL.
Embodiment 1:
See Fig. 1 to Fig. 3, the two swirl combustion chamber of the straight wall of a kind of diesel engine, the axial profile of this firing chamber is ω font, comprise the upper diversion division 1 set gradually by the top of piston 7 to bottom of combustion chamber, aditus laryngis 2, lower diversion division 3, spherical crown shape boss 5, described aditus laryngis 2 comprises the diversion platform 21 connected successively from top to bottom, arc transition section 22, No. two diversion platforms 23, the ring-type arc-shaped convex that described upper diversion division 1 from top to bottom successively decreases for internal diameter, its upper end is connected with end face 71, lower end is connected with the upper end of a diversion platform 21 by the arc transition groove 4 of opening towards end face 71, a described diversion platform 21 is rounding frustum structure, the angle α of the tangent plane of its inwall and the end face 71 of piston 7 is 14 ° – 16 °, the ratio of the upper-end surface internal diameter of a diversion platform 21 and the diameter of end face 71 is 0.7 – 0.74, described No. two diversion platforms 23 are cylindrical structural, the tangent plane of its inwall and the axis being parallel of piston 7, the ratio being positioned at the maximum inner diameter of aditus laryngis 2 lower area in the internal diameter of No. two diversion platforms 23 and firing chamber is 0.97 – 0.99, described lower diversion division 3 is the arc groove of opening towards end face 71, its upper end is connected by the lower end of arc transition boss 6 with No. two diversion platforms 23, lower end is connected with the border, bottom surface of spherical crown shape boss 5, and spherical crown shape boss 5 is positioned at the bottom center of firing chamber.
Discharge and the oil consumption results of property of the motor of employing the utility model firing chamber are as follows: NOx emission is 3.1g/kWh, particulate matter PM discharges as 0.017g/kWh, minimum specific fuel consumption is 187g/kWh, region reaches 11.8%, reach state IV emission level, and compared with existing technological scheme, oil consumption advantage is comparatively obvious.
Claims (6)
1. the two swirl combustion chamber of the straight wall of diesel engine, the axial profile of this firing chamber is ω font, comprise the upper diversion division (1), aditus laryngis (2), the lower diversion division (3) that are connected successively by top to the bottom of combustion chamber of piston (7), described aditus laryngis (2) comprise from top to bottom connect successively a diversion platform (21), arc transition section (22), No. two diversion platforms (23), it is characterized in that:
Described No. two diversion platforms (23) are cylindrical structural, the axis being parallel of the tangent plane of its inwall and piston (7), and the ratio being positioned at the maximum inner diameter of aditus laryngis (2) lower area in the internal diameter of No. two diversion platforms (23) and firing chamber is 0.97 – 0.99.
2. the two swirl combustion chamber of the straight wall of a kind of diesel engine according to claim 1, it is characterized in that: a described diversion platform (21) is rounding frustum structure, the angle α of the end face (71) of the tangent plane of its inwall and piston (7) is 14 ° of – 16 °.
3. the two swirl combustion chamber of the straight wall of a kind of diesel engine according to claim 1 and 2, is characterized in that: the ratio of the upper-end surface internal diameter of a described diversion platform (21) and the diameter of end face (71) is 0.7 – 0.74.
4. the two swirl combustion chamber of the straight wall of a kind of diesel engine according to claim 1 and 2, it is characterized in that: the annular projection that described upper diversion division (1) is from top to bottom successively decreased for internal diameter, its upper end is connected with end face (71), and lower end is connected with the upper end of a diversion platform (21) by the arc transition groove (4) of opening towards end face (71).
5. the two swirl combustion chamber of the straight wall of a kind of diesel engine according to claim 1 and 2, is characterized in that: the bottom center of described firing chamber is provided with spherical crown shape boss (5).
6. the two swirl combustion chamber of the straight wall of a kind of diesel engine according to claim 5, it is characterized in that: described lower diversion division (3) is for opening is towards the arc groove of end face (71), its upper end is connected by the lower end of arc transition boss (6) with No. two diversion platforms (23), and lower end is connected with the border, bottom surface of spherical crown shape boss (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520030368.2U CN204476545U (en) | 2015-01-16 | 2015-01-16 | Straight-wall double-swirl combustion chamber of diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520030368.2U CN204476545U (en) | 2015-01-16 | 2015-01-16 | Straight-wall double-swirl combustion chamber of diesel engine |
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| CN204476545U true CN204476545U (en) | 2015-07-15 |
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| CN201520030368.2U Withdrawn - After Issue CN204476545U (en) | 2015-01-16 | 2015-01-16 | Straight-wall double-swirl combustion chamber of diesel engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595007A (en) * | 2015-01-16 | 2015-05-06 | 东风商用车有限公司 | Straight-wall double-swirl combustion chamber of diesel engine |
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2015
- 2015-01-16 CN CN201520030368.2U patent/CN204476545U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595007A (en) * | 2015-01-16 | 2015-05-06 | 东风商用车有限公司 | Straight-wall double-swirl combustion chamber of diesel engine |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150715 Effective date of abandoning: 20170929 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20150715 Effective date of abandoning: 20170929 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |