CN112160852B - Air inlet mixing device and engine - Google Patents
Air inlet mixing device and engine Download PDFInfo
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- CN112160852B CN112160852B CN202011072123.8A CN202011072123A CN112160852B CN 112160852 B CN112160852 B CN 112160852B CN 202011072123 A CN202011072123 A CN 202011072123A CN 112160852 B CN112160852 B CN 112160852B
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- egr
- air inlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention discloses an air inlet mixing device which comprises an EGR (exhaust gas recirculation) air inlet pipe, an air inlet pressure stabilizing cavity and an EGR distribution pipe positioned in the air inlet pressure stabilizing cavity, wherein the air inlet pressure stabilizing cavity is provided with a fresh air inlet interface and an EGR air inlet interface, the EGR air inlet pipe is communicated with the EGR distribution pipe through the EGR air inlet interface, and a plurality of air outlet holes corresponding to air inlets of cylinders are formed in the length direction of the EGR distribution pipe. Because the steady voltage effect of EGR distributor pipe has reduced the EGR and has admitted air the influence of pulse to the gas mixture, has optimized the gaseous mixed effect with the fresh air intake of EGR, consequently for this mixing arrangement that admits air the commonality is better under each operating mode. The invention also discloses an engine comprising the air inlet mixing device.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an air inlet mixing device and an engine.
Background
With the stricter emission regulations and the higher ecological requirements of people, the engines with low fuel consumption and low emission become the direction of efforts in the industry. The application of the EGR (Exhaust Gas Recirculation) technology can effectively reduce the emission, so that the EGR technology becomes a common technical means of the current engine.
The uniformity of mixing of fresh air and EGR gas has a significant impact on the dynamics, economy, emissions, etc. of diesel engines. In the air intake process of the engine, if the mixed gas is not uniformly distributed, the gas quantity distributed to each cylinder through the air inlet pipe is inconsistent, and the problems of poor working consistency, poor combustion effect and the like of each cylinder of the engine are inevitably caused. Therefore, the homogeneity of the mixture is one of the important indicators for evaluating the mixer.
The air intake of the engine is in a pulse form, and the pulse forms of fresh air intake and EGR gas under different working conditions are different, so that the mixing forms and the mixing degrees of the fresh air intake and the EGR gas under different working conditions are different. The ideal air inlet mixing target is not influenced by air inlet pulse, and the mixing effect is good under all working conditions. The conventional intake air mixing device generally includes two types, one is to insert the end of the EGR pipe into the intake pipe, and the other is to provide a mixer at the junction of the EGR gas and the fresh intake air.
However, the gas mixing effect of the existing gas inlet mixer is directly influenced by gas inlet pulses, the mixing effect difference under each working condition is large, and the condition that the gas inlet mixing effect does not meet the requirement under individual working conditions exists, so that the universality under all working conditions is poor.
Therefore, how to improve the all-operating-condition universality of the EGR mixer is a technical problem which needs to be solved by the technical personnel in the field at present.
Disclosure of Invention
In view of the above, the present invention provides an intake air mixing device, which can optimize the mixing effect of EGR gas and fresh intake air and has better versatility under various operating conditions.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an air intake mixing arrangement, includes the EGR intake pipe, admits air the steady voltage chamber and is located the inside EGR distributing pipe of steady voltage chamber admits air, the steady voltage chamber of admitting air is equipped with fresh interface and EGR interface that admits air of admitting air, the EGR intake pipe passes through the EGR admit air the interface communicate in the EGR distributing pipe, set up a plurality of ventholes that correspond with each cylinder air inlet on the length direction of EGR distributing pipe.
Preferably, the end of giving vent to anger of EGR intake pipe connect in one side of EGR distributing pipe, it is a plurality of the venthole evenly distributed in on the EGR distributing pipe, it is a plurality of on the EGR distributing pipe the venthole is along keeping away from the distribution direction of the end of giving vent to anger of EGR intake pipe is grow gradually.
Preferably, the air outlet end of the EGR air inlet pipe is communicated with the middle part of the EGR distribution pipe.
Preferably, the EGR air inlet port and the fresh air inlet port are arranged in parallel in the middle of the air inlet pressure stabilizing cavity.
Preferably, a plurality of air outlet portions are arranged in the length direction of the EGR distribution pipe, each air outlet portion comprises a plurality of air outlet holes distributed in the circumferential direction of the EGR distribution pipe, and the distance between every two adjacent air outlet portions is equal.
Preferably, the air outlet is a circular hole.
Preferably, one end of the EGR air inlet interface, which is positioned on the outer side of the air inlet pressure stabilizing cavity, is connected with the EGR air inlet pipe through a first connecting part, and one end of the EGR air inlet interface, which is positioned on the inner side of the air inlet pressure stabilizing cavity, is connected with the EGR distribution pipe through a second connecting part.
Preferably, first connecting portion including set up in EGR admit air the first flange of interface outer end with set up in the first cooperation flange of the end of giving vent to anger of EGR intake pipe, second connecting portion including set up in EGR admit air the inner second flange of interface with set up in the second cooperation flange of the end of admitting air of EGR distributing pipe.
The air inlet mixing device comprises an EGR (exhaust gas recirculation) air inlet pipe, an air inlet pressure stabilizing cavity and an EGR distribution pipe positioned in the air inlet pressure stabilizing cavity, wherein the air inlet pressure stabilizing cavity is provided with a fresh air inlet interface and an EGR air inlet interface, the EGR air inlet pipe is communicated with the EGR distribution pipe through the EGR air inlet interface, and a plurality of air outlet holes corresponding to air inlets of all cylinders are formed in the length direction of the EGR distribution pipe.
The working principle of the invention is as follows: EGR gas enters the EGR distribution pipe through the EGR gas inlet pipe, pressure stabilization is carried out in the EGR distribution pipe, pulses are reduced, then the EGR gas enters the gas inlet pressure stabilization cavity through a plurality of gas outlet holes in the EGR distribution pipe, meanwhile, fresh air enters the gas inlet pressure stabilization cavity through the fresh air inlet interface and is mixed with the EGR gas, and the mixed gas enters each engine cylinder again to be used for combustion work. Because the steady voltage effect of EGR distributor pipe has reduced the EGR and has admitted air the influence of pulse to the gas mixture, has optimized the gaseous mixed effect with the fresh air intake of EGR, consequently for this mixing arrangement that admits air the commonality is better under each operating mode.
The invention also provides an engine comprising the air inlet mixing device. The derivation process of the beneficial effect of the engine is substantially similar to the derivation process of the beneficial effect of the intake air mixing device, and therefore, the description is omitted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the internal structure of an intake air mixing system in an embodiment of the present invention;
FIG. 2 is a schematic view showing the structure of an EGR inlet pipe in the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an intake plenum in an exemplary embodiment of the invention;
FIG. 4 is a schematic diagram of the EGR distribution tube configuration in an embodiment of the present invention;
FIG. 5 is a graph comparing simulation results of EGR rate relative deviation of each cylinder of the structure of the present invention and the original structure under the working condition of 1400 rpm;
FIG. 6 is a graph comparing simulation results of EGR rate relative deviation of each cylinder of the structure of the present invention and the original structure under the working condition of 2200 rpm.
The meaning of the respective reference numerals in fig. 1 to 4 is as follows:
the system comprises a gas inlet pressure stabilizing cavity 1, a fresh gas inlet pipe 2, an EGR (exhaust gas recirculation) inlet pipe 3, an EGR distribution pipe 4, a gas outlet hole 5, a first matching flange 31, an EGR gas inlet interface 11, a fresh gas inlet interface 21 and a second matching flange 41.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, fig. 1 is a schematic diagram illustrating an internal structure of an intake air mixing system according to an embodiment of the present invention; FIG. 2 is a schematic view showing the structure of an EGR inlet pipe in the embodiment of the present invention; FIG. 3 is a schematic structural diagram of an intake plenum in an exemplary embodiment of the invention; FIG. 4 is a schematic diagram of the EGR distribution tube configuration in an embodiment of the present invention.
The invention provides an air inlet mixing device which comprises an EGR (exhaust gas recirculation) air inlet pipe 3, an air inlet pressure stabilizing cavity 1 and an EGR distribution pipe 4 positioned in the air inlet pressure stabilizing cavity 1, wherein the air inlet pressure stabilizing cavity 1 is provided with a fresh air inlet interface 21 and an EGR air inlet interface 11, the EGR air inlet pipe 3 is communicated with the EGR distribution pipe 4 through the EGR air inlet interface 11, and a plurality of air outlet holes 5 corresponding to air inlets of cylinders are formed in the length direction of the EGR distribution pipe 4. The fresh air inlet pipe 2 is communicated with the air inlet pressure stabilizing cavity 1 through a fresh air inlet interface 21, and the fresh air inlet is fresh air sucked by an air inlet system from the outside.
The working principle of the invention is as follows: EGR gas enters an EGR distribution pipe 4 through an EGR gas inlet pipe 3, pressure stabilization is carried out in the EGR distribution pipe 4, pulse is reduced, then the EGR gas enters an air inlet pressure stabilizing cavity 1 through a plurality of gas outlet holes 5 on the EGR distribution pipe 4, meanwhile, fresh air enters the air inlet pressure stabilizing cavity 1 through a fresh air inlet port 21 through a fresh air inlet pipe 2 and is mixed with the EGR gas, and the mixed gas enters each engine cylinder for combustion and work application. Because the steady voltage effect of EGR distributor pipe 4 has reduced the influence of EGR pulse of admitting air to gas mixture, has optimized the mixed effect of EGR gas and fresh air admission, consequently for this mixing arrangement that admits air commonality is better under each operating mode.
Preferably, the end of giving vent to anger of EGR intake pipe 3 is connected in one side of EGR distributing pipe 4, a plurality of ventholes 5 evenly distributed is on EGR distributing pipe 4, can realize EGR gas and fresh homogeneous mixing who admits air, a plurality of ventholes 5 on EGR distributing pipe 4 are along keeping away from the distribution direction of the end of giving vent to anger of EGR intake pipe 3 grow gradually, that is to say, 5 variation in size of venthole on EGR distributing pipe 4, this sets up according to the gas flow characteristic, the purpose is the variation in size of venthole 5 on the EGR distributing pipe 4 that makes different engine cylinder correspond. Specifically, the aperture of the air outlet 5 which is closer to the air outlet end of the EGR air inlet pipe 3 (namely, the air inlet of the EGR distribution pipe 4) is smaller, the aperture of the air outlet 5 which is farther from the air outlet end of the EGR air inlet pipe 3 is larger, and meanwhile, the length direction of the air inlet pressure stabilizing cavity 1 extends along the arrangement direction of each cylinder of the engine, namely, the length direction of the EGR distribution pipe 4 extends along the arrangement direction of each cylinder of the engine, so that the air outlet 5 is arranged, the larger air outlet 5 is arranged at the position far away from the air outlet end of the EGR air inlet pipe 3 on the EGR distribution pipe 4, so that the far position can have enough air outlet amount, the amount of EGR gas entering each cylinder of the engine can be ensured to be more consistent, and the air inlet mixing uniformity of each cylinder is better. Meanwhile, the pressure stabilizing effect of the EGR distribution pipe 4 can reduce the influence of EGR gas inlet pulse on gas mixing, so that the gas inlet mixing device has better universality under various working conditions.
To facilitate the arrangement of the EGR inlet pipe 3, it is preferable that the outlet end of the EGR inlet pipe 3 communicates with the middle of the EGR distribution pipe 4, as shown in fig. 1 and 4. The air outlet holes 5 on the EGR distribution pipe 4 are gradually enlarged from the middle part to the two ends.
In order to further optimize the arrangement structure of the EGR inlet pipe 3 and the fresh air inlet pipe 2 and the intake pressure stabilizing cavity 1, preferably, the EGR inlet port 11 and the fresh air inlet port 21 are arranged in parallel in the middle of the intake pressure stabilizing cavity 1, as shown in fig. 1, fresh intake air enters from the middle of the intake pressure stabilizing cavity 1 and can be mixed with EGR gas sprayed from the EGR distribution pipe 4 more quickly.
Preferably, a plurality of air outlet portions are arranged in the length direction of the EGR distribution pipe 4, each air outlet portion comprises a plurality of air outlet holes 5 distributed circumferentially around the EGR distribution pipe 4, and the distance between every two adjacent air outlet portions is equal. So set up, the portion of giving vent to anger makes a plurality of positions of circumference of EGR distributor pipe 4 all give vent to anger, and then can make EGR gas be full of fast and admit air pressure stabilizing cavity 1 and carry out the homogeneous mixing from a plurality of angles with fresh admission.
It should be noted that the outlet holes 5 of the EGR distribution pipe 4 can be designed into various shapes, such as a circular hole, a square hole or an opening with other shapes, and preferably, for convenience of processing, the outlet holes 5 in this embodiment are circular holes.
It should be noted that the EGR inlet pipe 3 may be communicated with the EGR distribution pipe 4 in various ways, for example, by providing connecting pieces on the EGR inlet pipe 3 and the EGR distribution pipe 4 and connecting both the connecting pieces with the EGR inlet port 11 of the inlet pressure stabilizing chamber 1 to achieve mutual communication, or extending the outlet end of the EGR inlet pipe 3 from the EGR inlet port 11 into the inlet pressure stabilizing chamber 1 to communicate with the EGR distribution pipe 4, and so on. Preferably, one end of the EGR inlet port 11 located outside the air inlet pressure stabilizing cavity 1 is connected with the EGR inlet pipe 3 through a first connecting portion, and one end of the EGR inlet port 11 located inside the air inlet pressure stabilizing cavity 1 is connected with the EGR distribution pipe 4 through a second connecting portion.
It should be noted that, the first connecting portion and the second connecting portion may be designed in various structures, such as a connecting flange or a pipe joint. Preferably, the first connecting portion includes a first flange disposed at an outer end of the EGR inlet port 11 and a first mating flange 31 disposed at an outlet end of the EGR inlet pipe 3, and the second connecting portion includes a second flange disposed at an inner end of the EGR inlet port 11 and a second mating flange 41 disposed at an inlet end of the EGR distribution pipe 4. During assembly, the second matching flange 41 of the EGR distribution pipe 4 is fixedly connected with the second flange on the inner side of the air inlet pressure stabilizing cavity 1 through bolts, and then the first matching flange 31 of the EGR air inlet pipe 3 is fixed with the first flange on the outer side of the air inlet pressure stabilizing cavity 1, so that the EGR air inlet pipe 3 is communicated with the EGR distribution pipe 4. In addition, the connection mode of the fresh air inlet pipe 2 and the air inlet pressure stabilizing cavity 1 is similar to the connection mode of the EGR air inlet pipe 3 and the air inlet pressure stabilizing cavity 1, and the description is omitted herein.
The simulation calculation of the mixing uniformity is carried out at the rated point and the large torque point of a certain model, the relative deviation of the EGR rate of each cylinder (c1 cylinder-c 4 cylinder) is used for representing the intake mixing uniformity, and the calculation result is shown in fig. 5 and fig. 6. Compared with the original machine structure, the structure has the advantages that the intake air mixing uniformity under various working conditions is better, the relative deviation of the EGR rate of each cylinder is within +/-5%, the maximum relative deviation of the EGR rate under the working condition of 1400rpm is reduced by 56% compared with the original machine structure, and the maximum relative deviation of the EGR rate under the working condition of 2200rpm is reduced by 57% compared with the original machine structure. Moreover, the calculation result shows that in the original structure, because the air inlet pulses under different working conditions are different, the air inlet mixing uniformity is greatly influenced by the air inlet pulses, and the relative deviation rules of the EGR rate of each cylinder under different working conditions are inconsistent. Under the structure of the air inlet mixer, the influence of the change of working conditions on the uniformity of air inlet mixing is small, and the universality under each working condition is good.
The invention has the following beneficial effects:
1) according to the scheme, the EGR distribution pipe 4 is arranged in the air inlet pressure stabilizing cavity 1, so that the effects of stabilizing pressure and reducing pulse of EGR gas in the pipe are realized, the difference of mixing effects under different working conditions is small, and the universality under all working conditions is good;
2) according to the scheme, the air outlet holes 5 corresponding to different cylinders on the EGR distribution pipe 4 are designed to be different in aperture, so that the amount of EGR entering each cylinder is consistent as much as possible, and the mixing ratio of fresh air entering each cylinder and EGR gas is more uniform;
3) according to the scheme, the EGR distribution pipe 4 is additionally arranged on the premise of not changing the original engine pipeline arrangement form, the arrangement is simple, the disassembly is convenient, and the reliability is high.
The invention also provides an engine comprising the air inlet mixing device. The derivation process of the beneficial effect of the engine is substantially similar to the derivation process of the beneficial effect of the intake air mixing device, and therefore, the description is omitted.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An air inlet mixing device is characterized by comprising an EGR air inlet pipe (3), an air inlet pressure stabilizing cavity (1) and an EGR distributing pipe (4) positioned in the air inlet pressure stabilizing cavity (1), the air inlet pressure stabilizing cavity (1) is provided with a fresh air inlet interface (21) and an EGR air inlet interface (11), the EGR air inlet pipe (3) is communicated with the EGR distribution pipe (4) through the EGR air inlet interface (11), a plurality of air outlet holes (5) corresponding to air inlets of each cylinder are arranged in the length direction of the EGR distribution pipe (4), the air outlet end of the EGR air inlet pipe (3) is connected to one side of the EGR distribution pipe (4), a plurality of air outlet holes (5) are uniformly distributed on the EGR distribution pipe (4), the air outlet holes (5) on the EGR distribution pipe (4) are gradually enlarged along the distribution direction of the air outlet end far away from the EGR air inlet pipe (3).
2. The intake air mixing device according to claim 1, wherein an outlet end of the EGR inlet pipe (3) communicates with a middle portion of the EGR distribution pipe (4).
3. The intake air mixing device according to claim 2, characterized in that the EGR intake port (11) and the fresh intake port (21) are arranged in parallel in a middle portion of the intake plenum (1).
4. The intake air mixing device according to claim 1, wherein a plurality of outlet portions are provided in a length direction of the EGR distribution pipe (4), each outlet portion includes a plurality of outlet holes (5) distributed circumferentially around the EGR distribution pipe (4), and a distance between every two adjacent outlet portions is equal.
5. The intake-air mixing device according to claim 1, wherein the outlet aperture (5) is a circular aperture.
6. The intake air mixing device according to claim 1, wherein one end of the EGR intake port (11) located outside the intake plenum (1) is connected to the EGR intake pipe (3) through a first connecting portion, and one end of the EGR intake port (11) located inside the intake plenum (1) is connected to the EGR distribution pipe (4) through a second connecting portion.
7. The intake air mixing device according to claim 6, wherein the first connecting portion comprises a first flange disposed at an outer end of the EGR intake port (11) and a first mating flange (31) disposed at an outlet end of the EGR intake pipe (3), and the second connecting portion comprises a second flange disposed at an inner end of the EGR intake port (11) and a second mating flange (41) disposed at an inlet end of the EGR distribution pipe (4).
8. An engine characterized by comprising the intake air mixing device as claimed in any one of claims 1 to 7.
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| CN202011072123.8A CN112160852B (en) | 2020-10-09 | 2020-10-09 | Air inlet mixing device and engine |
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| CN110792535A (en) * | 2019-12-20 | 2020-02-14 | 潍柴动力股份有限公司 | Circulating exhaust gas mixing device and diesel engine |
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