CN115628160B - Supercharged engine low-pressure EGR (exhaust gas recirculation) hybrid structure, engine and automobile - Google Patents
Supercharged engine low-pressure EGR (exhaust gas recirculation) hybrid structure, engine and automobile Download PDFInfo
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- CN115628160B CN115628160B CN202211155222.1A CN202211155222A CN115628160B CN 115628160 B CN115628160 B CN 115628160B CN 202211155222 A CN202211155222 A CN 202211155222A CN 115628160 B CN115628160 B CN 115628160B
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- 238000000926 separation method Methods 0.000 claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002912 waste gas Substances 0.000 claims description 72
- 239000007789 gas Substances 0.000 claims description 51
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
Classifications
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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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- 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
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
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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
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
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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
Abstract
The invention belongs to the technical field of automobile engines, and particularly relates to a low-pressure EGR (exhaust gas recirculation) mixing structure of a supercharged engine, which comprises a mixing separation pipe, an exhaust gas inlet pipe and an air inlet pipe arranged at one end of a compressor impeller of a supercharger, wherein the air inlet pipe comprises an air inlet section and a mixing outlet section, the mixing separation pipe is positioned between the air inlet section and the mixing outlet section and is fixedly connected with the air inlet section and the mixing outlet section, the exhaust gas inlet pipe comprises an exhaust gas pipe section and a condensate water return section, the exhaust gas pipe section is fixedly connected with the mixing separation pipe and is communicated with the mixing separation pipe, the inner wall of the exhaust gas pipe section is tangent to the inner wall of the mixing separation pipe, the condensate water return section is fixedly connected with the exhaust gas pipe section and the mixing separation pipe, and the condensate water return section is positioned at the physical lowest point position between the exhaust gas pipe section and the mixing separation pipe. The purpose is that: the problem that condensate water is formed to enter a supercharger compressor after EGR high-temperature exhaust gas and air are mixed in a supercharged engine, so that the supercharger is damaged is solved.
Description
Technical Field
The invention belongs to the technical field of automobile engines, and particularly relates to a low-pressure EGR (exhaust gas recirculation) mixing structure of a supercharged engine, an engine and an automobile.
Background
Exhaust gas recirculation (EGR, exhaustGasRecirculation) is an effective measure for reducing the generation of NOx gases in the engine cylinder. The working principle is as follows: part of the exhaust gas of the engine is cooled and then sent back to the engine cylinder through the air inlet system to participate in the combustion process. The exhaust gas extraction position can be divided into low-pressure EGR and high-pressure EGR, the gas extraction before the catalyst is high-pressure EGR, and the gas extraction after the catalyst is low-pressure EGR. The gas composition in the low-pressure EGR combustion chamber comes from two parts, one part is fresh air introduced by an air filter, the other part is waste gas which is taken from a catalyst and cooled by an EGR cooler, and the two parts of gas are mixed before a booster compressor, and then enter the combustion chamber to participate in combustion after passing through the booster, an intercooler and an intake manifold. The low-pressure EGR mixing structure of the gasoline supercharged engine has the function of fully mixing exhaust gas and fresh air and meeting the use requirement of a supercharger. If the uniformity of the mixed gas is not satisfied, abnormal noise of the supercharger and efficiency of the compressor are reduced, and the performance of the engine is further affected; the EGR high-temperature waste gas is mixed with air and then condensed to form water drops, and the water drops enter the supercharger to damage the compressor blades of the supercharger.
CN106837617a discloses a "high uniformity EGR mixing device", proposes an EGR mixer of a novel structure to improve the uniformity of gas mixing; CN210483916U discloses an EGR exhaust gas mixer, which can fully mix EGR exhaust gas of an engine of a low-pressure EGR system with fresh air, improve compressor efficiency of a supercharger, and finally improve power performance of the engine; the above-mentioned publication does not take into account the risk that the supercharged engine will form condensed water into the compressor of the supercharger after the EGR high temperature exhaust gas is mixed with air, thereby causing damage to the supercharger.
Disclosure of Invention
The purpose of the invention is that: the low-pressure EGR mixing structure of the supercharged engine, the engine and the automobile are used for solving the problem that condensate water is formed after high-temperature EGR waste gas of the supercharged engine is mixed with air and enters a compressor of the supercharger, so that the supercharger is damaged.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the utility model provides a supercharged engine low pressure EGR hybrid structure, includes mixed separator tube, waste gas intake pipe and installs the intake pipe at the compressor impeller one end of booster, the intake pipe includes air inlet section and mixed section of giving vent to anger, mixed separator tube is located between air inlet section and the mixed section of giving vent to anger, and with air inlet section and mixed section of giving vent to anger fixed connection, mixed separator tube's internal diameter size is greater than air inlet section's internal diameter size and mixed section of giving vent to anger's internal diameter size, waste gas intake pipe includes waste gas pipeline section and comdenstion water return section, waste gas pipeline section and mixed separator tube fixed connection, and with mixed separator tube intercommunication, waste gas pipeline section's inner wall and mixed separator tube's inner wall are tangent, comdenstion water return section and waste gas pipeline section, mixed separator tube fixed connection, the comdenstion water return section is located the physical minimum position between waste gas pipeline section and the mixed separator tube.
Further limited, the mixing separation pipe comprises a mixing cylinder section and a separation circular table section which are communicated with each other, the mixing cylinder section is fixedly connected with the air inlet section, the waste gas section and the condensate water return section, the separation circular table section is fixedly connected with the mixing outlet section, the inner wall of the separation circular table section is conical, and the inner diameter of the separation circular table section close to one end of the mixing cylinder section is larger than that of one end close to the mixing outlet section. Such structural design, the mixed gas is rotatory back at the mixed cylinder section, and under the effect of air inertia, remove to separation circle bench section, be the design of circular cone form through separation round bench section inner wall, can make the rotational velocity of mixed air, further accelerate in the separation circle bench section to improve the separation effect to the condensate water, the practicality is stronger.
Further defined, the inner diameter dimension of the mixing cylinder section is D3, the inner diameter dimension of the air intake section is D2, and D3 > D2. By means of the structural design, steps are formed between the mixing cylindrical section and the air inlet section through the inner diameter size difference of the mixing cylindrical section and the air inlet section, high-temperature waste gas forming rotational flow in the mixing separation pipe can be reduced to a certain extent, blocking of air entering the mixing cylindrical section through the air inlet section is achieved, and accordingly air flow in the mixing separation pipe moves more stably and is high in practicability.
Further defined, the length dimension of the separation circular table section is L3, the inner diameter dimension of the mixed gas outlet section is D1, L3 is greater than 0.5×d1, d3=d1+2×cot (β/2), and the included angle of the circular table on the inner wall of the separation circular table section is β, which is greater than or equal to 10 ° and less than or equal to 170 °. By the structural design, the length dimension L3 of the separation circular table section is limited under the condition that the inner diameter dimension D1 of the mixed gas outlet section is determined by limiting the included angle beta of the inner wall circular table of the separation circular table section, so that the mixed gas has enough acceleration distance in the separation circular table section, the separation effect on condensed water is ensured, and the practicability is higher.
Further defined, the included angle between the central line of the exhaust pipe section and the central line of the mixing separation pipe is alpha, and alpha is more than 90 degrees and less than or equal to 150 degrees. By means of the structural design, the angle of the waste gas in the waste gas pipe section entering the mixing separation pipe is offset, so that after the waste gas enters the mixing separation pipe, the flow direction is offset towards the mixed gas outlet section, vortex is formed, and the mixed gas can smoothly enter the mixed gas outlet section, and the practicability is high.
Further limited, the included angle between the inner wall of the condensate water return section and the central line of the waste gas pipe section is gamma, and the gamma is more than 90 degrees and less than 180 degrees. By means of the structural design, the condensate water flows back smoothly, and the practicability is high.
Further limited, the inner wall width of the condensate water return section is L5, the inner diameter size of the waste gas pipe section is D4, D4 is more than 0.1 and less than 1.0, D4.
Further defined, the distance from the geometric center point of the mixing cylindrical section to the central end face of the compressor impeller is L1, the inner diameter size of the mixing air outlet section is D1, and L1 is more than 2 x D1. By means of the structural design, a sufficient distance is reserved between the geometric center point of the mixing cylindrical section and the center end face of the compressor impeller, the mixed gas is rectified, turbulence of the mixed gas when the mixed gas enters the compressor impeller is reduced, and the practicability is high.
Further defined, the exhaust pipe section has an inner diameter dimension D4 and a length dimension L4, wherein L4 > D4/sin (180- α), and the mixing cylinder section has an inner diameter dimension D3,0 < D4 < 0.5 x D3.
The invention also discloses an engine, which comprises a supercharger and the low-pressure EGR mixing structure of the supercharged engine, wherein the supercharger comprises a compressor impeller, and the air inlet pipe is arranged at one end of the compressor impeller of the supercharger.
The invention also discloses an automobile comprising the engine.
The invention adopting the technical scheme has the following advantages:
1. through the mutual connection of the mixing separation pipe, the waste gas inlet pipe and the air inlet pipe, high-temperature waste gas rotates in the mixing separation pipe, air and high-temperature waste gas are mixed, the use requirement of a supercharger is met, meanwhile, condensed water formed in the mixing process of the high-temperature waste gas and the air is separated from the mixed gas, and the separated condensed water flows back to the waste gas pipe section through the condensed water return section under the action of gravity and is discharged from the waste gas pipe section, so that the problem of damage of a compressor impeller caused by the condensed water is avoided;
2. after the mixed gas rotates in the mixed cylindrical section, the mixed gas moves to the separation circular table section under the action of air inertia, and the rotation speed of the mixed gas can be further accelerated in the separation circular table section through the conical design of the inner wall of the separation circular table section, so that the separation effect on condensed water is improved, and the practicability is higher;
3. the step is formed between the mixing cylinder section and the air inlet section through the inner diameter size difference of the mixing cylinder section and the air inlet section, so that high-temperature waste gas forming rotational flow in the mixing separation pipe can be reduced to a certain extent, and the air entering the mixing cylinder section through the air inlet section is blocked, so that the air flow in the mixing separation pipe moves more stably, and the practicability is higher;
4. the angle that waste gas in the waste gas pipe section got into in the mixing separation pipe shifts for waste gas gets into after the mixing separation pipe, and flow direction shifts towards the mixing section of giving vent to anger, forms the vortex, thereby makes the more smooth and easy entering mixing section of giving vent to anger of mixed gas, and the practicality is stronger.
Drawings
The invention can be further illustrated by means of non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic diagram of a low pressure EGR hybrid architecture for a supercharged engine, engine and mounting architecture for an embodiment of an automobile in accordance with the present invention;
FIG. 2 is a schematic diagram showing a low-pressure EGR mixing structure of a supercharged engine, an engine and a low-pressure EGR mixing structure of a supercharged engine in an embodiment of an automobile according to the present invention;
FIG. 3 is a schematic cross-sectional view of a low pressure EGR mixing structure for a supercharged engine, an engine, and an automobile in accordance with one embodiment of the present invention;
FIG. 4 is a schematic diagram II of a low pressure EGR mixing structure for a supercharged engine, an engine and a vehicle according to the present invention;
FIG. 5 is a third schematic diagram of a low pressure EGR mixing structure for a supercharged engine, an engine and a low pressure EGR mixing structure for a supercharged engine in an embodiment of an automobile according to the present invention;
the main reference numerals are as follows:
an air inlet pipe 1, an air inlet section 11, a mixed air outlet section 12,
A mixing and separating pipe 2, a mixing cylinder section 21, a separating circular table section 22,
The waste gas inlet pipe 3, the waste gas pipe section 31 and the condensate water return section 32.
A supercharger 4, and a compressor impeller 41.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the specific embodiments, wherein like or similar parts are designated by the same reference numerals throughout the drawings or the description, and implementations not shown or described in the drawings are in a form well known to those of ordinary skill in the art. In addition, directional terms such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", etc. in the embodiments are merely directions with reference to the drawings, and are not intended to limit the scope of the present invention.
Embodiment one:
as shown in fig. 1 to 5, a low-pressure EGR mixing structure of a supercharged engine of the present invention includes a mixing-separation pipe 2, an exhaust gas intake pipe 3 and an intake pipe 1 installed at one end of a compressor impeller 41 of a supercharger 4,
the air inlet pipe 1 comprises an air inlet section 11 and a mixed air outlet section 12,
the mixing and separating pipe 2 is positioned between the air inlet section 11 and the mixed outlet section 12 and is fixedly connected with the air inlet section 11 and the mixed outlet section 12,
the inner diameter size of the mixing and separating tube 2 is larger than the inner diameter size of the air inlet section 11 and the inner diameter size of the mixed outlet section 12,
the exhaust gas inlet pipe 3 comprises an exhaust gas pipe section 31 and a condensate water return section 32,
the exhaust pipe section 31 is fixedly connected with the mixing and separating pipe 2 and is communicated with the mixing and separating pipe 2,
the inner wall of the exhaust pipe section 31 is tangential to the inner wall of the mixing separator pipe 2,
the condensate water return section 32 is fixedly connected with the waste gas pipe section 31 and the mixing and separating pipe 2,
the condensate return water section 32 is located at the physical lowest point between the exhaust pipe section 31 and the mixing separator pipe 2.
In this embodiment, when in use, high temperature waste gas enters the mixing and separating tube 2 through the waste gas tube section 31 of the waste gas inlet tube 3 and rotates in the mixing and separating tube 2, so that air introduced through the air inlet section 11 of the air inlet tube 1 is fully mixed with the high temperature waste gas in the mixing and separating tube 2, condensed water formed in the mixing process of the high temperature waste gas and the air is separated from the mixed gas, the separated condensed water flows back to the waste gas tube section 31 through the condensed water return section 32 under the action of gravity and is discharged from the waste gas tube section 31, and the mixed gas enters the supercharger 4 through the mixed gas outlet section 12, thereby meeting the use requirement of the supercharger 4.
Embodiment two:
as shown in fig. 1 to 5, a low-pressure EGR mixing structure of a supercharged engine of the present invention includes a mixing-separation pipe 2, an exhaust gas intake pipe 3, and an intake pipe 1 installed at one end of a compressor impeller 41 of a supercharger 4;
the air inlet pipe 1 comprises an air inlet section 11 and a mixed air outlet section 12, the mixed separation pipe 2 comprises a mixed cylindrical section 21 and a separation circular table section 22 which are communicated with each other, the inner wall of the separation circular table section 22 is conical, the inner diameter of one end of the separation circular table section 22 close to the mixed cylindrical section 21 is larger than that of one end close to the mixed air outlet section 12, and the waste gas inlet pipe 3 comprises a waste gas pipe section 31 and a condensate water return section 32;
the mixing cylinder section 21 is fixedly connected and communicated with the air inlet section 11, the waste gas pipe section 31 and the condensate water return section 32, the inner wall of the waste gas pipe section 31 is tangent to the inner wall of the mixing cylinder section 21, the separating circular table section 22 is fixedly connected and communicated with the mixing outlet section 12, the condensate water return section 32 is fixedly connected with the waste gas pipe section 31 and the mixing cylinder section 21, and the condensate water return section 32 is positioned at the physical lowest point position between the waste gas pipe section 31 and the mixing cylinder section 21;
the inner diameter dimension of the mixing cylinder section 21 is D3, the inner diameter dimension of the air inlet section 11 is D2, D3 is more than D2,
the length dimension of the separation circular table section 22 is L3, the inner diameter dimension of the mixed gas outlet section 12 is D1, L3 is more than 0.5D 1, D3=D1+2 x cot (beta/2), the included angle of the circular table of the inner wall of the separation circular table section 22 is beta, beta is more than or equal to 10 degrees and less than or equal to 170 degrees,
the included angle between the central line of the exhaust pipe section 31 and the central line of the mixing separation pipe 2 is alpha, alpha is more than 90 degrees and less than or equal to 150 degrees,
the included angle between the inner wall of the condensed water backwater section 32 and the central line of the waste gas pipe section 31 is gamma, the gamma is more than 90 degrees and less than 180 degrees,
the width of the inner wall of the condensate water backwater section 32 is L5, the inner diameter of the waste gas section 31 is D4, D4 is more than 0.1 and less than 1.0 and less than 1.5,
the distance from the geometric center point of the mixing cylindrical section 21 to the central end face of the compressor wheel 41 is L1, L1 > 2 x d1,
the length dimension of the exhaust pipe section 31 is L4, L4 is more than D4/sin (180-alpha), and 0 < D4 is less than 0.5 x D3.
In this embodiment, during use, high-temperature exhaust gas enters the mixing cylinder section 21 through the exhaust pipe section 31 of the exhaust gas inlet pipe 3, and is swirled in the mixing cylinder section 21, and is fully mixed with air introduced through the air inlet section 11 of the inlet pipe 1 in the separating circular table section 22, condensed water formed in the mixing process of the high-temperature exhaust gas and the air is separated from the mixed gas, the separated condensed water flows back to the exhaust pipe section 31 through the condensed water return section 32 under the action of gravity, and is discharged from the exhaust pipe section 31, and the mixed gas enters the supercharger 4 through the mixed gas outlet section 12, so that the use requirement of the supercharger 4 is met.
Embodiment III:
an engine comprises a supercharger 4 and a low-pressure EGR mixing structure of the supercharged engine, wherein the supercharger 4 comprises a compressor impeller 41, and an air inlet pipe 1 is arranged at one end of the compressor impeller 41 of the supercharger 4.
The low-pressure EGR mixing structure of the supercharged engine comprises a mixing separation pipe 2, an exhaust gas inlet pipe 3 and an inlet pipe 1 arranged at one end of a compressor impeller 41 of a supercharger 4;
the air inlet pipe 1 comprises an air inlet section 11 and a mixed air outlet section 12, the mixed separation pipe 2 comprises a mixed cylindrical section 21 and a separation circular table section 22 which are communicated with each other, the inner wall of the separation circular table section 22 is conical, the inner diameter of one end of the separation circular table section 22 close to the mixed cylindrical section 21 is larger than that of one end close to the mixed air outlet section 12, and the waste gas inlet pipe 3 comprises a waste gas pipe section 31 and a condensate water return section 32;
the mixing cylinder section 21 is fixedly connected and communicated with the air inlet section 11, the waste gas pipe section 31 and the condensate water return section 32, the inner wall of the waste gas pipe section 31 is tangent to the inner wall of the mixing cylinder section 21, the separating circular table section 22 is fixedly connected and communicated with the mixing outlet section 12, the condensate water return section 32 is fixedly connected with the waste gas pipe section 31 and the mixing cylinder section 21, and the condensate water return section 32 is positioned at the physical lowest point position between the waste gas pipe section 31 and the mixing cylinder section 21;
the inner diameter dimension of the mixing cylinder section 21 is D3, the inner diameter dimension of the air inlet section 11 is D2, D3 is more than D2,
the length dimension of the separation circular table section 22 is L3, the inner diameter dimension of the mixed gas outlet section 12 is D1, L3 is more than 0.5D 1, D3=D1+2 x cot (beta/2), the included angle of the circular table of the inner wall of the separation circular table section 22 is beta, beta is more than or equal to 10 degrees and less than or equal to 170 degrees,
the included angle between the central line of the exhaust pipe section 31 and the central line of the mixing separation pipe 2 is alpha, alpha is more than 90 degrees and less than or equal to 150 degrees,
the included angle between the inner wall of the condensed water backwater section 32 and the central line of the waste gas pipe section 31 is gamma, the gamma is more than 90 degrees and less than 180 degrees,
the width of the inner wall of the condensate water backwater section 32 is L5, the inner diameter of the waste gas section 31 is D4, D4 is more than 0.1 and less than 1.0 and less than 1.5,
the distance from the geometric center point of the mixing cylindrical section 21 to the central end face of the compressor wheel 41 is L1, L1 > 2 x d1,
the length dimension of the exhaust pipe section 31 is L4, L4 is more than D4/sin (180-alpha), and 0 < D4 is less than 0.5 x D3.
Embodiment four:
an automobile comprises an engine, the engine comprises a supercharger 4 and a low-pressure EGR mixing structure of the supercharged engine, the supercharger 4 comprises a compressor impeller 41, and an air inlet pipe 1 is arranged at one end of the compressor impeller 41 of the supercharger 4.
The low-pressure EGR mixing structure of the supercharged engine comprises a mixing separation pipe 2, an exhaust gas inlet pipe 3 and an inlet pipe 1 arranged at one end of a compressor impeller 41 of a supercharger 4;
the air inlet pipe 1 comprises an air inlet section 11 and a mixed air outlet section 12, the mixed separation pipe 2 comprises a mixed cylindrical section 21 and a separation circular table section 22 which are communicated with each other, the inner wall of the separation circular table section 22 is conical, the inner diameter of one end of the separation circular table section 22 close to the mixed cylindrical section 21 is larger than that of one end close to the mixed air outlet section 12, and the waste gas inlet pipe 3 comprises a waste gas pipe section 31 and a condensate water return section 32;
the mixing cylinder section 21 is fixedly connected and communicated with the air inlet section 11, the waste gas pipe section 31 and the condensate water return section 32, the inner wall of the waste gas pipe section 31 is tangent to the inner wall of the mixing cylinder section 21, the separating circular table section 22 is fixedly connected and communicated with the mixing outlet section 12, the condensate water return section 32 is fixedly connected with the waste gas pipe section 31 and the mixing cylinder section 21, and the condensate water return section 32 is positioned at the physical lowest point position between the waste gas pipe section 31 and the mixing cylinder section 21;
the inner diameter dimension of the mixing cylinder section 21 is D3, the inner diameter dimension of the air inlet section 11 is D2, D3 is more than D2,
the length dimension of the separation circular table section 22 is L3, the inner diameter dimension of the mixed gas outlet section 12 is D1, L3 is more than 0.5D 1, D3=D1+2 x cot (beta/2), the included angle of the circular table of the inner wall of the separation circular table section 22 is beta, beta is more than or equal to 10 degrees and less than or equal to 170 degrees,
the included angle between the central line of the exhaust pipe section 31 and the central line of the mixing separation pipe 2 is alpha, alpha is more than 90 degrees and less than or equal to 150 degrees,
the included angle between the inner wall of the condensed water backwater section 32 and the central line of the waste gas pipe section 31 is gamma, the gamma is more than 90 degrees and less than 180 degrees,
the width of the inner wall of the condensate water backwater section 32 is L5, the inner diameter of the waste gas section 31 is D4, D4 is more than 0.1 and less than 1.0 and less than 1.5,
the distance from the geometric center point of the mixing cylindrical section 21 to the central end face of the compressor wheel 41 is L1, L1 > 2 x d1,
the length dimension of the exhaust pipe section 31 is L4, L4 is more than D4/sin (180-alpha), and 0 < D4 is less than 0.5 x D3.
The low-pressure EGR mixing structure of the supercharged engine, the engine and the automobile provided by the invention are described in detail. The description of the specific embodiments is only intended to aid in understanding the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (11)
1. A supercharged engine low pressure EGR hybrid architecture characterized by: including mixing separation pipe (2), waste gas intake pipe (3) and installing intake pipe (1) in compressor impeller (41) one end of booster (4), intake pipe (1) are including air admission section (11) and mixed section of giving vent to anger (12), mixing separation pipe (2) are located between air admission section (11) and the mixed section of giving vent to anger (12) and with air admission section (11) and mixed section of giving vent to anger (12) fixed connection, the internal diameter size of mixing separation pipe (2) is greater than the internal diameter size of air admission section (11) and the internal diameter size of mixed section of giving vent to anger (12), waste gas intake pipe (3) include waste gas pipe section (31) and comdenstion water return section (32), waste gas pipe section (31) and mixed separation pipe (2) fixed connection, and with mixed separation pipe (2) intercommunication, the inner wall of waste gas pipe section (31) and the inner wall of mixed separation pipe section (2) are tangent, mixed separation pipe section return (32) and waste gas pipe section (12) fixed connection, one end of comdenstion water return (32) and mixed pipe section (2) are connected towards waste gas section (31) and the minimum in the direction of inclination.
2. The supercharged engine low-pressure EGR mixing structure of claim 1, wherein: the mixing separation pipe (2) comprises a mixing cylindrical section (21) and a separation circular table section (22) which are communicated with each other, the mixing cylindrical section (21) is fixedly connected with an air inlet section (11), an exhaust gas pipe section (31) and a condensate water return section (32), the separation circular table section (22) is fixedly connected with a mixing outlet section (12), the inner wall of the separation circular table section (22) is conical, and the inner diameter size of the separation circular table section (22) close to one end of the mixing cylindrical section (21) is larger than that of one end close to the mixing outlet section (12).
3. The supercharged engine low-pressure EGR mixing structure of claim 2, wherein: the inner diameter of the mixing cylindrical section (21) is D3, the inner diameter of the air inlet section (11) is D2, and D3 is more than D2.
4. A supercharged engine low-pressure EGR mixing structure according to claim 3, characterized in that: the length dimension of the separation circular table section (22) is L3, the inner diameter dimension of the mixed gas outlet section (12) is D1, L3 is more than 0.5 x D1, d3=d1+2 x cot (beta/2), and the included angle of the circular table of the inner wall of the separation circular table section (22) is beta, and beta is more than or equal to 10 degrees and less than or equal to 170 degrees.
5. The supercharged engine low-pressure EGR mixing structure of claim 1, wherein: the included angle between the central line of the waste gas pipe section (31) and the central line of the mixing separation pipe (2) is alpha, and alpha is more than 90 degrees and less than or equal to 150 degrees.
6. The supercharged engine low-pressure EGR mixing structure of claim 1, wherein: the included angle between the inner wall of the condensate water return section (32) and the central line of the waste gas pipe section (31) is gamma, and the gamma is more than 90 degrees and less than 180 degrees.
7. The supercharged engine low-pressure EGR mixing structure of claim 1, wherein: the width of the inner wall of the condensate water return section (32) is L5, the inner diameter of the waste gas pipe section (31) is D4, and D4 is more than 0.1 and less than 1.0.
8. The supercharged engine low-pressure EGR mixing structure of claim 2, wherein: the distance from the geometric center point of the mixing cylindrical section (21) to the central end face of the compressor impeller (41) is L1, the inner diameter size of the mixing air outlet section (12) is D1, and L1 is more than 2 times D1.
9. The supercharged engine low-pressure EGR mixing structure of claim 2, wherein: the inner diameter size of the waste gas pipe section (31) is D4, the length size is L4, L4 is more than D4/sin (180-alpha), and the inner diameter size of the mixing cylindrical section (21) is D3, wherein D4 is more than 0 and less than 0.5 x D3.
10. An engine, characterized in that: a low-pressure EGR mixing structure for a supercharged engine comprising a supercharger (4) and a supercharging engine as claimed in any one of claims 1 to 9, the supercharger (4) comprising a compressor wheel (41), the intake pipe (1) being mounted at one end of the compressor wheel (41) of the supercharger (4).
11. An automobile, characterized in that: an engine comprising the engine of claim 10.
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