CN114635814B - Scaling spray pipe acceleration mixer for strengthening high-strength diesel oil-gas mixing - Google Patents
Scaling spray pipe acceleration mixer for strengthening high-strength diesel oil-gas mixing Download PDFInfo
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- CN114635814B CN114635814B CN202210244018.0A CN202210244018A CN114635814B CN 114635814 B CN114635814 B CN 114635814B CN 202210244018 A CN202210244018 A CN 202210244018A CN 114635814 B CN114635814 B CN 114635814B
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- 239000007921 spray Substances 0.000 title claims abstract description 132
- 238000002156 mixing Methods 0.000 title claims abstract description 26
- 230000001133 acceleration Effects 0.000 title claims description 12
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- 230000002708 enhancing effect Effects 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims abstract 4
- 210000000078 claw Anatomy 0.000 claims description 21
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000002485 combustion reaction Methods 0.000 abstract description 29
- 239000000446 fuel Substances 0.000 abstract description 19
- 238000005096 rolling process Methods 0.000 abstract description 14
- 238000005507 spraying Methods 0.000 abstract description 5
- 239000004071 soot Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 33
- 239000007789 gas Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
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- 238000000889 atomisation Methods 0.000 description 4
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Abstract
The invention provides a scaling spray pipe accelerating mixer for enhancing oil-gas mixing of a high-enhancement diesel engine, which comprises N scaling spray pipes and spray pipe fixing seats, wherein N is more than or equal to 2, an installation conical surface with a positioning conical angle R is formed by rotating along the central axis of an oil spray nozzle, the N scaling spray pipes are annularly and uniformly distributed on the installation conical surface and are fixed below the spray nozzle through the spray pipe fixing seats, R is more than or equal to 120 degrees and less than or equal to 150 degrees, the scaling spray pipes are of scaling structures and comprise a rolling cone hole, a spray hole throat and a spraying cone hole, the center of the upper port of the rolling cone hole is away from the central point K of the oil spray hole, K=2+/-0.1 mm, the aperture of the upper port of the rolling cone hole is D1, the distance from the upper port of the rolling cone hole to the spray hole throat is L1, the caliber of the throat is D2, the aperture of the lower port of the spraying cone hole is D3, the distance from the lower port of the spraying cone hole is L2, and the structure satisfies the relation: d3 > D1 > D2, L2 > L1; the accelerating mixer can quickly improve the excellent mixing degree of fuel and air, improve the premixed combustion proportion and combustion efficiency, reduce oil consumption and soot emission, and improve the power and dynamic performance of a diesel engine.
Description
Technical Field
The invention belongs to the technical field of ultra-thin combustion of internal combustion engines, and particularly relates to a scaling spray pipe accelerating mixer for enhancing oil-gas mixing of a high-strength diesel engine.
Background
Diesel engines are the main power source of heavy equipment machinery, delivering more cargo materials to the required area at a faster rate in order to increase the high power density and maneuverability of heavy civilian power, diesel engines are evolving towards high intensification, where combustion technologies evolve towards efficient clean combustion and in-cylinder fuel injection evolve towards rapid and excellent mixing. The high reinforcement of the diesel engine is realized by increasing the rotation speed, the oil injection pressure and the air inlet pressure and increasing the air inflow and the oil injection quantity, and meanwhile, the high reinforcement diesel engine also faces some problems: the rotating speed of the diesel engine is high, the fuel atomization mixing time is shortened, and the oil-gas mixture is unevenly distributed and the combustion is incomplete; the air inlet pressure is increased, the spray penetration distance is reduced, the ignition and flame-retarding period is shortened, once flame is formed, the fuel is continuously sprayed into the flame and cannot be mixed with air, so that combustion is worsened; the oil injection pressure is improved, the spray penetration distance is prolonged, so that the fuel oil impacts the wall surface of the combustion chamber to be atomized poorly, the incomplete combustion is caused, the oil consumption is increased, and black smoke is emitted. By using oxygen-containing fuel, reducing the diameter of the spray hole, optimizing the spray strategy and the like, the combustion can be improved to a certain extent, and the emission can be reduced, but the problems of technology, cost and the like are faced. The scaled spray pipe reinforced oil-gas mixing acceleration mixing technology is used as one of potential technologies for realizing the efficient engine in the future, can effectively improve the thermal efficiency of the engine and reduce the emission, and is an important way for further realizing the energy conservation and emission reduction of the efficient engine in the future.
Jet pipe jet technology is used as one of the future high-efficiency engine pre-grinding technologies, and the current research on jet pipe jet is still in the preliminary research and development stage of straight jet pipe jet. The scaling spray pipe has acceleration effect, and the research of the prior art on the application of the scaling spray pipe to lean combustion is still in a blank state, so that the scaling spray pipe reinforced oil-gas mixing acceleration mixer device is necessary to be provided, and the blank of the technical research is filled.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a scaling spray pipe accelerating mixer for enhancing the oil-gas mixing of a high-strength diesel engine, which promotes the fuel/air mixing process and improves the premixed combustion proportion.
The technical scheme of the invention is realized as follows:
The scaling spray pipe accelerating mixer for enhancing the oil-gas mixing of the high-enhancement diesel engine is arranged in a cylinder and comprises N scaling spray pipes and spray pipe fixing seats for fixing the scaling spray pipes, wherein N is more than or equal to 2, a mounting conical surface with a positioning cone angle R is formed by revolving along the central axis of the oil spray pipe, N scaling spray pipes are annularly and uniformly distributed on the mounting conical surface and are fixed below the oil spray pipe through the spray pipe fixing seats, and R is more than or equal to 120 degrees and less than or equal to 150 degrees;
The scaling spray pipe is of a scaling structure, and comprises an upper section close to one side of the oil nozzle, namely a rolling taper hole, a spray hole throat in the middle and a spray taper hole in the lower section, wherein the distance from the center of an upper port of the rolling taper hole to the center point of the spray hole of the oil nozzle is K, K=2+/-0.1 mm, the aperture of the upper port of the rolling taper hole is D1, the distance from the upper port of the rolling taper hole to the spray hole throat is L1, the caliber of the throat is D2, the aperture of a lower port of the spray taper hole is D3, the distance from the lower port of the spray taper hole to the spray hole throat is L2, and the structure of the scaling spray pipe meets the following relation: d3 > D1 > D2, L2 > L1.
Preferably, l1=6±0.5mm, l2=8±0.5mm, d1=3±0.1mm, d1=2±0.1mm, d1=4.5±0.1mm.
More preferably, the cylinder is divided into an air suction area and an air discharge area along the valve symmetrical dividing line, and the number of the convergent-divergent nozzles of the air suction area is larger than or equal to that of the convergent-divergent nozzles of the air discharge area.
Further preferably, n=the number of oil injection holes of the oil injection nozzle, and each scaling nozzle corresponds to an oil injection hole on the oil injection nozzle.
Further preferably, the nozzle fixing seat comprises a cylindrical embedded seat and N fixed claws which are uniformly distributed in a ring shape with a central shaft of the embedded seat as a center, the fixed claws extend downwards from the lower end surface of the embedded seat, the embedded seat is coaxial with the oil nozzle, the upper end surface of the embedded seat is embedded into the cylinder cover and is connected with the cylinder cover through a set screw between the fixed claws, the fixed claws are provided with fixed pipe holes which obliquely penetrate through the fixed claws, and the scaling nozzle is arranged in the fixed pipe holes.
Compared with the prior art, the invention has the following beneficial effects:
1. The entrainment air is conveyed to a core area of a spraying axis by utilizing the ejection effect of the scaling spray pipe so as to promote oil-gas mixing; the reverse pressure gradient of the expansion angle of the scaling spray pipe is utilized to promote the generation of vortex groups at the outlet of the scaling spray pipe and strengthen the entrainment effect of spray, thereby rapidly improving the excellent mixing degree of fuel/air, improving the premixed combustion proportion and the combustion efficiency, reducing the oil consumption and the carbon smoke emission and improving the power and the dynamic property of the diesel engine;
2. the scaling spray pipe accelerates the temperature of the mixer to be low and is close to the cold wall surface of the combustion chamber, cold boundary gas is sucked into the scaling spray pipe to cool the mixed gas, the ignition and flame-retarding period is effectively delayed, the concentration of fuel vapor in the spray core is diluted to promote the premixed combustion proportion, and efficient clean combustion is realized;
3. the scaling spray pipe has an acceleration effect, turbulent mixing in the spray pipe is enhanced, the mixing process is promoted, and the atomization effect is improved;
4. The interference among oil beams is reduced, the atomization quality is improved, the scaling spray pipe can convey the entrained air to a spray core area, the effect of homogenizing equivalent ratio distribution is achieved, and the concentration of oil gas in a dilution passing area in a combustion chamber is increased;
5. The structure of the traditional engine is not required to be changed, and the improvement cost is low.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic view of the assembly of the mixer of the present invention in a cylinder;
FIG. 2 is a bottom view of the mixer mounted to the cylinder head in accordance with the first embodiment;
FIG. 3 is a bottom view of the mixer assembly on the cylinder head of the second embodiment;
FIG. 4 is an enlarged view of a portion of the portion I of FIG. 1;
fig. 5 is a schematic structural view of the convergent-divergent nozzle.
In the figure: 1. a fuel injector assembly 11 and a fuel injector; 2. cylinder cover, 3, piston, 31, combustion chamber, 4, cylinder block; 5. a mixer; 51. scaling the spray pipe; 511. winding the taper hole; 512. a jet orifice throat; 513. ejecting a taper hole; b. a fuel injection port center point; 52. a spray pipe fixing seat; 521. a fixed claw; 522. embedding a seat; 523. a set screw; 524. fixing the pipe hole; r, fixing an included angle; 6. a double valve assembly; 61. a discharge valve hole; 62 an intake valve opening; a. the valve is symmetrically divided into lines.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First, this embodiment takes an engine with a double valve assembly 6 and an omega-shaped combustion chamber 31 as an example, and describes a specific implementation of the convergent-divergent nozzle mixer of this embodiment with reference to fig. 1-2 and fig. 4-5:
The invention relates to a scaling spray pipe accelerating mixer for enhancing oil-gas mixing of a high-enhancement diesel engine, which comprises N scaling spray pipes 51 and spray pipe fixing seats 52 for fixing the scaling spray pipes 51, wherein N=6, a mounting conical surface with a positioning conical angle R is formed by revolving along the central axis of an oil spray nozzle 11, the mounting conical surface is a structure with the cross section diameter continuously reduced from bottom to top, 6 scaling spray pipes 51 are annularly and uniformly arrayed on the mounting conical surface, namely the revolving center line of the scaling spray pipes 51 is positioned on the mounting conical surface and fixed at a certain distance below the oil spray nozzle through the spray pipe fixing seats 52, and 6 scaling spray pipes 51 are in one-to-one correspondence with oil spray openings on the six-hole oil spray nozzle 11, namely the spray pipes are positioned in an oil spray field obliquely below the oil spray openings, so that interference among sprayed oil beams can be reduced, and atomization quality is improved;
The scaling spray pipe 51 is of a scaling structure and comprises an upper section close to one side of the oil nozzle 11, namely a rolling cone 511, a spray hole throat 512 in the middle and a spray cone 513 in the lower section, wherein the distance from the center of the upper port of the rolling cone 511 to the center point b of the spray hole of the oil nozzle 11 is K, K=2+/-0.1 mm, the upper port aperture of the rolling cone 511 is D1, the distance from the upper port aperture to the spray hole throat 512 is L1, the throat aperture is D2, the lower port aperture of the spray cone 513 is D3, the distance from the lower port aperture to the spray hole throat 512 is L2, the structural size of the scaling spray pipe 51 is L1=6+/-0.5 mm, L2=8+/-0.5 mm, D1=3+/-0.1 mm, D1=2+/-0.1 mm and D1=4.5+/-0.1 mm;
Referring again to fig. 2, in the engine having the double valve assembly 6, the cylinder is divided into an intake zone and an exhaust zone along the valve symmetry dividing line a according to the distribution structure of the exhaust valve holes 61 and the intake valve holes 62 in the double valve assembly 6, and the number of convergent-divergent nozzles 51 in the intake zone and the number of convergent-divergent nozzles 51 in the exhaust zone are 3;
The nozzle fixing seat 52 comprises a cylindrical embedding seat 522 and 6 fixing claws 521 which are uniformly distributed in a ring shape by taking the central shaft of the embedding seat 522 as the center, the fixing claws 521 extend downwards from the lower end face of the embedding seat 522, the embedding seat 522 is sleeved outside the fuel spray nozzle 11 and is coaxial with the fuel spray nozzle 11, the upper end face of the embedding seat 522 is embedded in the cylinder head 2 and is connected with the cylinder head 2 through a set screw 523 positioned between the fixing claws 521, a fixing pipe hole 524 which obliquely penetrates the fixing claws 521 is formed in the fixing claws 521, the zooming nozzle 51 is arranged in the fixing pipe hole 524, the upper end of the zooming nozzle 51 extends outside the fixing pipe hole 524 to the fuel spray nozzle 11, the lower end of the zooming nozzle 51 extends outside the fixing pipe hole 524 to the side of the combustion chamber 31, and the zooming nozzle 51 is made of metal or ceramic;
The scaling spray pipe 51 and the oil spray nozzle 11 have a certain flow distance, the fuel oil sprayed at high pressure is atomized and mixed for the second time along the axis of the scaling spray pipe 51, and the sucked air is conveyed to the core area of the spraying axis by utilizing the 'injection effect' of the inlet of the scaling spray pipe 51 so as to promote the oil-gas mixing; the reverse pressure gradient of the expansion angle of the scaling spray pipe 51 is utilized to promote the generation of vortex groups at the outlet of the scaling spray pipe 51 and strengthen the entrainment effect of spray, thereby rapidly improving the excellent mixing degree of fuel/air, improving the premixed combustion proportion and the combustion efficiency, reducing the oil consumption and the soot emission and improving the power and the dynamic performance of the diesel engine; in addition, the temperature of the scaling spray pipe acceleration mixer is low and is close to the cold wall surface of the combustion chamber 31, cold boundary gas is sucked into the scaling spray pipe 51 to cool the mixed gas, the ignition flame-retardant period is effectively delayed, the concentration of fuel vapor in the spray core is diluted to improve the premixed combustion proportion, and efficient clean combustion is realized.
In the second embodiment, taking an engine with a double valve assembly 6 and an omega-shaped combustion chamber 31 as an example, a specific implementation scheme of the scaling nozzle mixer of the embodiment is described with reference to fig. 1 and 3-5:
The invention relates to a scaling spray pipe accelerating mixer for enhancing oil-gas mixing of a high-enhancement diesel engine, which comprises N scaling spray pipes 51 and spray pipe fixing seats 52 for fixing the scaling spray pipes 51, wherein N=8, a mounting conical surface with a positioning cone angle R is formed by revolving along the central axis of an oil spray nozzle 11, R is more than or equal to 120 degrees and less than or equal to 150 degrees, the mounting conical surface is of a structure with the cross section diameter continuously reduced from bottom to top, 8 scaling spray pipes 51 are annularly and uniformly distributed on the mounting conical surface, namely the revolving center line of the scaling spray pipes 51 is positioned on the mounting conical surface and fixed at a certain distance below the oil spray nozzle through the spray pipe fixing seats 52, and 8 scaling spray pipes 51 are in one-to-one correspondence with oil spray nozzles on an eight-hole oil spray nozzle 11;
The scaling spray pipe 51 is of a scaling structure and comprises an upper section close to one side of the oil nozzle 11, which is provided with a rolling taper hole 511, a spray hole throat 512 in the middle and a spray taper hole 513 in the lower section, wherein the distance from the center of the upper port of the rolling taper hole 511 to the center point b of the spray hole of the oil nozzle 11 is K, K=2+/-0.05 mm, the upper port aperture of the rolling taper hole 511 is D1, the distance from the upper port aperture to the spray hole throat 512 is L1, the throat aperture is D2, the lower port aperture of the spray taper hole 513 is D3, the distance from the lower port aperture to the spray hole throat 512 is L2, the structural size of the scaling spray pipe 51 is L1=6+/-0.2 mm, L2=8+/-0.3 mm, D1=3+/-0.05 mm, D1=2+/-0.05 mm and D1=4.5+/-0.05 mm;
Referring again to fig. 3, in the engine having the double valve assembly 6, according to the distribution structure of the exhaust valve holes 61 and the intake valve holes 62 in the double valve assembly 6, the cylinder is divided into an intake area and an exhaust area along the valve symmetry dividing line a, and the number of convergent-divergent nozzles 51 in the intake area and the number of convergent-divergent nozzles 51 in the exhaust area are 4;
The nozzle fixing seat 52 comprises a cylindrical embedding seat 522 and 4 fixing claws 521 which are uniformly distributed in a ring shape with the central axis of the embedding seat 522 as the center, the fixing claws 521 extend downwards from the lower end face of the embedding seat 522, the embedding seat 522 is sleeved outside the fuel spray nozzle 11 and is coaxial with the fuel spray nozzle 11, the upper end face of the embedding seat 522 is embedded in the cylinder head 2 and is connected with the cylinder head 2 through a set screw 523 positioned between the fixing claws 521, a fixing pipe hole 524 which obliquely penetrates the fixing claws 521 is formed in the fixing claws 521, the zooming nozzle 51 is arranged in the fixing pipe hole 524, the upper end of the zooming nozzle 51 extends outside the fixing pipe hole 524 to the fuel spray nozzle 11, the lower end of the zooming nozzle 51 extends outside the fixing pipe hole 524 to the side of the combustion chamber 31, and the zooming nozzle 51 is made of metal or ceramic;
the workflow and technical effects of the convergent-divergent nozzle acceleration mixer in this embodiment are the same as those of the first embodiment, and are described in detail herein.
In the description of the present invention, the terms "lower", "upper", "lower", "upper port", "lower port", etc. refer to the directions or positional relationships based on the directions and positional relationships shown in fig. 1-5, which are merely for convenience of description and understanding of the present invention, and are not meant to be limitations on the scope of the invention.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. A scaling spray pipe accelerating mixer for strengthening oil-gas mixing of a high-strength diesel engine is characterized in that: the scaling spray pipe accelerating mixer is arranged in the air cylinder and comprises N scaling spray pipes and spray pipe fixing seats for fixing the scaling spray pipes, wherein N is more than or equal to 2, an installation conical surface with a positioning conical angle R is formed by rotating along the central axis of the oil spray nozzle, N scaling spray pipes are annularly and uniformly distributed on the installation conical surface and are fixed below the oil spray nozzle through the spray pipe fixing seats, and R is more than or equal to 120 degrees and less than or equal to 150 degrees;
The scaling spray pipe is of a scaling structure and comprises a spray cone hole close to an upper section of a suction cone hole of the oil nozzle, a spray hole throat in the middle and a spray cone hole in the lower section, the distance from the center of an upper port of the suction cone hole to the center point of the oil nozzle is K, K=2+/-0.1 mm, the aperture of the upper port of the suction cone hole is D1, the distance from the upper port of the suction cone hole to the spray hole throat is L1, the caliber of the throat is D2, the aperture of a lower port of the spray cone hole is D3, the distance from the upper port of the suction cone hole to the spray hole throat is L2, and the structure of the scaling spray pipe meets the following relation: d3 > D1 > D2, L2 > L1.
2. The enhanced high-intensity diesel fuel-air mixing convergent-divergent nozzle acceleration mixer of claim 1, wherein: the structure sizes of the scaling spray pipes are respectively as follows: l1=6±0.5mm, l2=8±0.5mm, d1=3±0.1mm, d1=2±0.1mm, d1=4.5±0.1mm.
3. The enhanced high-intensity diesel fuel-air mixing convergent-divergent nozzle acceleration mixer of claim 2, wherein: the cylinder is divided into an air suction area and an air discharge area along a valve symmetrical dividing line, and the number of the convergent-divergent nozzles in the air suction area is more than or equal to that of the convergent-divergent nozzles in the air discharge area.
4. A convergent-divergent nozzle acceleration mixer for enhancing oil and gas mixing of a highly enhanced diesel engine as claimed in claim 3, wherein: n=the number of injection holes of the injection nozzle, and each of the convergent-divergent injection pipes corresponds to an injection hole position on the injection nozzle.
5. The enhanced high-intensity diesel fuel-air mixing convergent-divergent nozzle acceleration mixer of claim 4, wherein: the spray pipe fixing seat comprises a cylindrical embedded seat and N fixing claws which are evenly distributed along the central shaft of the embedded seat in a ring shape, the fixing claws extend downwards from the lower end face of the embedded seat, the embedded seat is coaxial with the oil nozzle, the upper end face of the embedded seat is embedded into the cylinder cover and is connected with the cylinder cover through a set screw between the fixing claws, the fixing claws are provided with fixing pipe holes which obliquely penetrate through the fixing claws, and the scaling spray pipe is installed in the fixing pipe holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210244018.0A CN114635814B (en) | 2022-03-14 | Scaling spray pipe acceleration mixer for strengthening high-strength diesel oil-gas mixing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210244018.0A CN114635814B (en) | 2022-03-14 | Scaling spray pipe acceleration mixer for strengthening high-strength diesel oil-gas mixing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114635814A CN114635814A (en) | 2022-06-17 |
| CN114635814B true CN114635814B (en) | 2024-06-21 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762231A (en) * | 2016-12-09 | 2017-05-31 | 浙江明新能源科技有限公司 | Fuel injection device with atomizing mouth |
| CN107044373A (en) * | 2017-05-04 | 2017-08-15 | 陈明福 | A kind of oil-air mixing nozzle of energy saving vehicle |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762231A (en) * | 2016-12-09 | 2017-05-31 | 浙江明新能源科技有限公司 | Fuel injection device with atomizing mouth |
| CN107044373A (en) * | 2017-05-04 | 2017-08-15 | 陈明福 | A kind of oil-air mixing nozzle of energy saving vehicle |
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