CN113482807B - Backflow-preventing EGR (exhaust gas Recirculation) outlet pipe and engine EGR system - Google Patents

Backflow-preventing EGR (exhaust gas Recirculation) outlet pipe and engine EGR system Download PDF

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Publication number
CN113482807B
CN113482807B CN202110801206.4A CN202110801206A CN113482807B CN 113482807 B CN113482807 B CN 113482807B CN 202110801206 A CN202110801206 A CN 202110801206A CN 113482807 B CN113482807 B CN 113482807B
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gas
egr
outlet pipe
pipe
vent
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CN113482807A (en
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安涛
范建权
陈珏
王景智
苏一峰
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Dongfeng Commercial Vehicle Co Ltd
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Dongfeng Commercial Vehicle Co Ltd
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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
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • 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
    • F02M26/51—EGR valves combined with other devices, e.g. with intake valves or compressors
    • 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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  • 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 application relates to an anti-return EGR outlet duct and engine EGR system belongs to engine exhaust gas recirculation technical field, includes: one end of the first air outlet pipe is provided with a first air vent, and the other end of the first air outlet pipe is provided with a second air vent; the second air outlet pipe comprises a straight-line pipe body and a bent pipe body which are communicated with each other, a third air port is arranged at one end, far away from the bent pipe body, of the straight-line pipe body, and a fourth air port is arranged at one end, far away from the straight-line pipe body, of the bent pipe body; the second vent of the first air outlet pipe is communicated with the pipe wall of the straight-line pipe body, the fourth vent of the bent pipe body is communicated with the pipe wall of the first air outlet pipe, and the fourth vent of the bent pipe body faces the second vent of the first air outlet pipe. This application is followed the gaseous offset in fourth gas port outflow and the first gas outlet pipe to thereby play the effect of check valve, prevent that gas from flowing back in the pipeline.

Description

Backflow-preventing EGR (exhaust gas Recirculation) outlet pipe and engine EGR system
Technical Field
The application relates to the technical field of engine exhaust gas recirculation, in particular to an anti-backflow EGR (exhaust gas recirculation) outlet pipe and an engine EGR system.
Background
EGR (acronym for Exhaust Gas Recirculation, in chinese) technology is a technology in which a part of Exhaust Gas after engine combustion is reintroduced into an engine cylinder for re-combustion. This technique can reduce nitrogen oxides (NOx) in the exhaust gas and improve fuel economy.
The existing engine EGR system mainly comprises an engine, a supercharger, an EGR cooler and an EGR pipeline, wherein two ends of the EGR pipeline are respectively communicated with a turbine front pipeline of the supercharger and an engine air inlet pipeline, and the EGR cooler is arranged in the EGR pipeline. The engine has exhaust pulses, in a complete engine cycle process, each cylinder of the engine finishes the exhaust process in sequence to form exhaust pressure waves, the periodic pressure fluctuation is the exhaust pulses, the turbine front pressure at the wave crest of the exhaust pressure waves is higher than the air inlet pressure of the engine, under the action of the exhaust pulses, the EGR pipeline takes exhaust gas from the front pipeline of the turbine, the exhaust gas enters the engine air inlet pipeline after passing through the EGR pipeline and the EGR cooler and finally enters the engine cylinder, therefore, a certain EGR rate (the ratio of the amount of the recirculated exhaust gas to the total amount of the air inlet sucked into the cylinder) can be realized by utilizing the exhaust pulses; relatively high EGR rates may be achieved with exhaust pulses even with small intake to exhaust pressure differentials.
However, due to the inherent characteristics of the engine and the supercharger, when the engine is in a low-speed and high-torque condition, the intake pressure of the engine is higher than the pressure in front of the turbine, and the gas in the air inlet pipe of the engine even flows back to the front pipeline of the turbine through the EGR pipeline, so that the EGR is difficult to realize. At this time, an EGR check valve (one-way valve) is added to the EGR line, or the intake-side pressure is lowered at the expense of the boost pressure. Cost and trouble point increase are brought about by adding an EGR check valve in an EGR pipeline; reducing the intake side pressure at the expense of boost pressure results in increased fuel consumption.
Disclosure of Invention
The embodiment of the application provides an anti-backflow EGR (exhaust gas recirculation) outlet pipe and an engine EGR system, which aim to solve the problems that in the related art, cost and fault points are increased due to the addition of an EGR check valve in an EGR pipeline; the problem of fuel consumption increase is caused by reducing the pressure on the air inlet side at the expense of boost pressure.
The first aspect of the embodiment of the application provides an anti-return EGR outlet duct, includes:
one end of the first air outlet pipe is provided with a first air vent, and the other end of the first air outlet pipe is provided with a second air vent;
the second air outlet pipe comprises a straight-line pipe body and a bent pipe body which are communicated with each other, a third air vent is formed in one end, far away from the bent pipe body, of the straight-line pipe body, and a fourth air vent is formed in one end, far away from the straight-line pipe body, of the bent pipe body;
The second vent of the first air outlet pipe is communicated with the pipe wall of the straight-line pipe body, the fourth vent of the bent pipe body is communicated with the pipe wall of the first air outlet pipe, and the fourth vent of the bent pipe body faces the second vent of the first air outlet pipe.
In some embodiments: when the first gas pressure at the first vent port side is lower than the second gas pressure at the third vent port side, the second gas enters the straight-line section pipe body from the third vent port and is divided into two paths, and one path of the second gas enters the bent section pipe body and then flows out of the fourth vent port and enters the first gas outlet pipe;
and the other path of second gas enters the first gas outlet pipe through the second vent hole, the second gas flowing out of the fourth vent hole and the second gas in the first gas outlet pipe are in opposite impact, and the second gas in the first gas outlet pipe is returned to the interior of the straight section pipe body.
In some embodiments: the pressure of the second gas flowing out of the fourth air port is higher than the pressure of the second gas flowing into the first air outlet pipe from the second air port.
In some embodiments: the included angle between the first air outlet pipe and the straight-line-section pipe body is 133-137 degrees.
In some embodiments: and a fourth air port of the bent section pipe body extends into the first air outlet pipe and extends towards the second air port of the first air outlet pipe.
In some embodiments: an annular groove protruding outwards is formed in the pipe wall of the first air outlet pipe, and the notch of the annular groove faces the second vent of the first air outlet pipe.
In some embodiments: the annular groove comprises a bell mouth and an arc-shaped flanging, wherein the diameter of the bell mouth is gradually reduced along the axis of the first air outlet pipe, and the arc-shaped flanging is positioned at the inlet end of the bell mouth and is inwards curled.
In some embodiments: the annular grooves are arranged in a plurality of intervals along the axis direction of the first air outlet pipe, and two adjacent annular grooves are connected through the first air outlet pipe.
A second aspect of embodiments of the present application provides an engine EGR system, including: the EGR cooler is communicated with the EGR inlet pipe, the EGR mixer is communicated with the inlet manifold of the engine, and the EGR cooler is communicated with the EGR inlet pipe through any one of the anti-backflow EGR outlet pipes.
In some embodiments: still include turbo charger, intercooler and EGR valve, turbo charger's turbine and the exhaust manifold intercommunication of engine, communicate through the intercooler between turbo charger's compressor and the EGR blender, the EGR valve sets up on the anti-return EGR outlet duct between EGR cooler and the EGR blender.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides an anti-backflow EGR (exhaust gas recirculation) outlet pipe and an engine EGR system, and the anti-backflow EGR outlet pipe is provided with a first outlet pipe, one end of the first outlet pipe is provided with a first vent hole, and the other end of the first outlet pipe is provided with a second vent hole; the second air outlet pipe comprises a straight-line pipe body and a bent pipe body which are communicated with each other, a third air vent is arranged at one end, far away from the bent pipe body, of the straight-line pipe body, and a fourth air vent is arranged at one end, far away from the straight-line pipe body, of the bent pipe body; the second vent of the first air outlet pipe is communicated with the pipe wall of the straight-line pipe body, the fourth vent of the bent pipe body is communicated with the pipe wall of the first air outlet pipe, and the fourth vent of the bent pipe body faces the second vent of the first air outlet pipe.
Therefore, when the first gas pressure of a backflow-preventing EGR outlet pipe of this application when first gas vent side was greater than the second gas pressure of third vent side, first gas was divided into two the tunnel after getting into first outlet pipe by first blow vent forward, and first gas got into the straightway body behind the bending segment body all the way. The other path of first gas directly enters the straight-line section pipe body through the second vent, the two paths of first gas are mixed with the second gas after being converged in the straight-line section pipe body, the flow resistance of the first gas in the backflow-preventing EGR gas outlet pipe is small, and the forward smooth flow of the first gas is guaranteed.
When the first gas pressure at the first vent port side is lower than the second gas pressure at the third vent port side, the second gas reversely enters the straight-line section pipe body from the third vent port and is divided into two paths, and one path of the second gas enters the bent section pipe body and then flows out of the fourth vent port and enters the first gas outlet pipe; and the other path of second gas enters the first gas outlet pipe from the second vent. Because the fourth vent of crooked section body is towards the second vent of first outlet duct, the gaseous clashing towards of second in the second and the first outlet duct of following the fourth vent to with the second in the first outlet duct gaseous returning to in the straight line section body, thereby play the effect of check valve, prevent that the second is gaseous to flow back in the pipeline.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an EGR outlet pipe for preventing backflow in an embodiment of the present application;
FIG. 2 is a schematic view of a forward flow configuration of an embodiment of the present application;
FIG. 3 is a schematic view of a counter-current flow configuration for an embodiment of the present application;
FIG. 4 is a schematic structural view of an EGR outlet pipe according to another embodiment of the present application;
FIG. 5 is a schematic view of a reverse flow configuration of an alternative embodiment of the present application;
FIG. 6 is a schematic structural diagram of an engine EGR system according to an embodiment of the present application.
Reference numerals:
1. a first air outlet pipe; 2. a second air outlet pipe; 3. an annular groove; 11. a first vent; 12. a second vent; 21. a straight line section pipe body; 22. a bending section pipe body; 23. a third vent; 24. a fourth gas vent; 31. a bell mouth; 32. arc-shaped flanging;
101. the backflow-preventing EGR outlet pipe; 102. an engine; 103. an EGR inlet pipe; 104. an EGR cooler; 105. an EGR mixer; 106. a turbine; 107. a compressor; 108. an intercooler; 109. an EGR valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
The embodiment of the application provides an anti-backflow EGR (exhaust gas recirculation) outlet pipe and an engine EGR system, which can solve the problems that in the related art, the cost and the fault point are increased due to the addition of an EGR check valve in an EGR pipeline; the problem of fuel consumption increase is caused by reducing the pressure on the air inlet side at the expense of boost pressure.
Referring to fig. 1, in a first aspect, an embodiment of the present invention provides an EGR outlet pipe 101, including:
the gas-liquid separation device comprises a first gas outlet pipe 1, wherein one end of the first gas outlet pipe 1 is provided with a first vent hole 11, the other end of the first gas outlet pipe 1 is provided with a second vent hole 12, and the first gas outlet pipe 1 is preferably a long straight round pipe.
The second outlet pipe 2, this second outlet pipe 2 includes straightway body 21 and bend segment body 22 that communicate each other, and the one end of keeping away from bend segment body 22 on straightway body 21 is equipped with third gas port 23, and the one end of keeping away from straightway body 21 on bend segment body 22 is equipped with fourth gas port 24.
The second vent 12 of the first outlet pipe 1 is communicated with the pipe wall of the straight-line section pipe body 21, the fourth vent 24 of the bent section pipe body 22 is communicated with the pipe wall of the first outlet pipe 1, and the fourth vent 24 of the bent section pipe body 22 faces the second vent 12 of the first outlet pipe 1.
The backflow-preventing EGR outlet pipe 101 according to the embodiment of the present application can make the air flow smoothly flow in the forward direction and prevent the air flow from flowing in the reverse direction. When the gas flows in the forward direction, the gas enters the first gas outlet pipe 1 from the first vent 11, then the gas is divided into two paths, the first path of gas enters the straight-line section pipe body 21 from the second vent 12, and the second path of gas enters the bent section pipe body 22 from the fourth vent 24, then is merged with the first path of gas in the straight-line section pipe body 21, and finally flows out from the third vent 23.
When the gas flows reversely, the gas enters the straight-line section pipe body 21 from the third vent port 23, then the gas is divided into two paths, the first path of gas enters the first gas outlet pipe 1 from the second vent port 12, the second path of gas enters the bent section pipe body 22 and then flows out from the fourth vent port 24, the flowing direction of the second path of gas is opposite to that of the first path of gas, the second path of gas and the first path of gas collide and converge, and the second path of gas and the first path of gas flow back to the third vent port 23 in the same reverse direction, so that the function of a check valve is achieved.
In some alternative embodiments: referring to fig. 2 and 3, the present embodiment provides a backflow prevention EGR outlet duct 101 that, when a first gas pressure at the first air port 11 side is lower than a second gas pressure at the third air port 23 side, the first gas is exhaust gas and the second gas is compressed air.
The second gas enters the straight-line pipe body 21 through the third gas port 23 and then is divided into two paths, and one path of the second gas enters the bent-section pipe body 22 and then flows out of the fourth gas port 24 and enters the first gas outlet pipe 1. The other path of second gas enters the first gas outlet pipe 1 through the second vent hole 12, the second gas flowing out of the fourth vent hole 24 collides with the second gas in the first gas outlet pipe 1, returns the second gas in the first gas outlet pipe 1 to the straight-line pipe body 21, and finally flows out of the third vent hole 23 to enter the engine 102 for combustion.
This backflow prevention EGR outlet duct 101 is when the first gas pressure of first gas vent 11 side is greater than the second gas pressure of third gas vent 23 side, and first gas is waste gas, and the second gas is compressed air, and first gas is divided into two the tunnel after getting into first outlet duct 1 by first gas vent 11, and first gas gets into straightway body 21 behind the curved segment body 22 by fourth gas vent 24 all the way.
The other path of the first gas enters the straight-line section pipe body 21 through the second vent port 12, and the two paths of the first gas are converged in the straight-line section pipe body 21 and finally flow out of the third vent port 23 to enter the engine 102 for participating in combustion.
In some alternative embodiments: referring to fig. 1 to 3, in the embodiment of the present application, a backflow prevention EGR outlet pipe is provided, and the angle between the first outlet pipe 1 of the backflow prevention EGR outlet pipe 101 and the straight-line-section pipe body 21 is preferably, but not limited to, 133 ° to 137 °, and the angle between the first outlet pipe 1 and the straight-line-section pipe body 21 is further preferably 135 °.
In the embodiment of the present application, an obtuse angle is formed between the first air outlet pipe 1 and the linear section pipe body 21, and an included angle between the first air outlet pipe 1 and the linear section pipe body 21 is preferably, but not limited to, 133 ° to 137 °. When the gas in the first outlet pipe 1 is ensured to flow forward into the straight-line section pipe body 21, the flow resistance of the gas in the anti-backflow EGR outlet pipe 101 is small, and the normal conveying of waste gas into the engine 102 is ensured.
And when the gas in the straight-line-section pipe body 21 flows in the reverse direction to the first gas outlet pipe 1, the flow rate of the gas in the straight-line-section pipe body 21 entering the bent-section pipe body 22 is greater than the flow rate of the gas entering the first gas outlet pipe 1, so that the pressure of the second gas flowing out of the fourth gas port 24 is greater than the pressure of the second gas entering the first gas outlet pipe 1 from the second gas port 12.
The second gas flowing out of the fourth gas port 24 has enough pressure to impact the second gas entering the first gas outlet pipe 1 from the second gas port 12, and the second gas flowing out of the fourth gas port 24 and the second gas entering the first gas outlet pipe 1 from the second gas port 12 flow out of the third gas port 23 together and enter the engine 102 to participate in combustion.
In some alternative embodiments: referring to fig. 1, the present embodiment provides a backflow-preventing EGR outlet pipe, and the fourth vent 24 of the curved pipe 22 of the backflow-preventing EGR outlet pipe 101 extends into the first outlet pipe 1 and extends toward the second vent 12 of the first outlet pipe 1.
This application embodiment stretches into first outlet duct 1 with the fourth gas port 24 of curved segment body 22 in to extend fourth gas port 24 towards the 12 directions of second vent of first outlet duct 1, divide into two the tunnel after the second gas reverse entering straightway body 21, follow fourth gas port 24 outflow behind the second gas entering curved segment body 22 of the same way and get into first outlet duct 1.
The other path of second gas enters the first gas outlet pipe 1 through the second vent hole 12, the second gas flowing out of the fourth vent hole 24 is in positive hedging with the second gas in the first gas outlet pipe 1, the thrust of the second gas flowing out of the fourth vent hole 24 is enhanced, most of the second gas in the first gas outlet pipe 1 returns to the straight-line section pipe body 21, and finally flows out of the third vent hole 23 to enter the engine 102 for participating in combustion.
In some alternative embodiments: referring to fig. 4 and 5, the embodiment of the present application provides a backflow-preventing EGR outlet pipe, the pipe wall of the first outlet pipe 1 of the backflow-preventing EGR outlet pipe 101 is provided with an annular groove 3 protruding outwards, and the notch of the annular groove 3 faces the second vent 12 of the first outlet pipe 1.
The embodiment of the application is provided with the annular groove 3 protruding outwards on the pipe wall of the first air outlet pipe 1, and the notch of the annular groove 3 faces the second vent 12 of the first air outlet pipe 1. When the first gas pressure on the first port 11 side is higher than the second gas pressure on the third port 23 side, the EGR gas outflow pipe 101 for preventing backflow is configured such that the first gas is exhaust gas and the second gas is compressed air.
The first gas enters the first gas outlet pipe 1 from the first gas port 11 in the forward direction and then is divided into two paths, and one path of the first gas enters the bent section pipe body 22 from the fourth gas port 24 and then enters the straight section pipe body 21. The other path of first gas enters the straight-line section pipe body 21 through the second vent hole 12, the two paths of first gas are converged in the straight-line section pipe body 21, finally the first gas flows out of the third vent hole 23 to enter the engine 102 for combustion, and the annular groove 3 has no barrier effect on the first gas.
When the first gas pressure at the first vent 11 side is less than the second gas pressure at the third vent 23 side, the first gas is waste gas, the second gas is compressed air, the second gas enters the straight-line pipe body 21 through the third vent 23 and then is divided into two paths, and the second gas enters the bent pipe body 22 and then flows out of the fourth vent 24 to enter the first outlet pipe 1.
The other path of second gas enters the first gas outlet pipe 1 through the second vent hole 12, the second gas flowing out of the fourth vent hole 24 and the second gas in the first gas outlet pipe 1 are in opposite impact, the second gas in the first gas outlet pipe 1 returns to the straight section pipe body 21, and finally the second gas flows out of the third vent hole 23 and enters the engine 102 to participate in combustion.
The second gas which does not flow out from the third air port 23 and enter the engine 102 to participate in combustion continues to reversely flow into the first air outlet pipe 1, the flow resistance of the second gas is gradually increased under the inhibition effect of the annular groove 3 which protrudes outwards in the process that the second gas reversely flows in the first air outlet pipe 1, so that the second gas can not reversely flow, and the second gas positively flows together with the first gas and enters the engine 102 to participate in combustion.
In some alternative embodiments: referring to fig. 4 and 5, the embodiment of the present application provides a backflow prevention EGR outlet pipe, and the annular groove 3 of the backflow prevention EGR outlet pipe 101 includes a bell mouth 31 whose diameter is gradually reduced along the axis of the first outlet pipe 1, and a circular arc-shaped flange 32 that is inwardly turned at the inlet end of the bell mouth 31. The ring channel 3 is equipped with a plurality ofly, and a plurality of ring channels 3 set up along the axis direction interval of first outlet duct 1, connect through first outlet duct 1 between two adjacent ring channels 3.
The ring channel 3 of the embodiment of the present application includes the bellmouth 31 that reduces along the axis diameter of first outlet duct 1 gradually, and the entry end of bellmouth 31 is towards first air vent 11, and the exit end of bellmouth 31 is equipped with the circular arc turn-ups 32 of inside turn-ups towards second air vent 12 at the entry end of bellmouth 31.
When the first gas pressure at the first vent 11 side is less than the second gas pressure at the third vent 23 side, the first gas is waste gas, the second gas is compressed air, the second gas enters the straight-line pipe body 21 through the third vent 23 and then is divided into two paths, and the second gas enters the bent pipe body 22 and then flows out of the fourth vent 24 to enter the first outlet pipe 1.
The other path of second gas enters the first gas outlet pipe 1 through the second vent hole 12, the second gas flowing out of the fourth vent hole 24 collides with the second gas in the first gas outlet pipe 1, returns the second gas in the first gas outlet pipe 1 to the straight-line pipe body 21, and finally flows out of the third vent hole 23 to enter the engine 102 for combustion.
The second gas which does not flow out from the third air vent 23 and enters the engine 102 and participates in combustion continues to reversely flow into the first air outlet pipe 1, the flow resistance of the second gas is gradually increased under the inhibition effect of the annular groove 3 which protrudes outwards in the process of reversely flowing in the first air outlet pipe 1, and the second gas is prevented from reversely flowing in the first air outlet pipe 1. The annular groove 3 not only increases the flow resistance of the second gas, but also enables the flow direction of the second gas to turn back under the flow guiding effect of the circular arc-shaped flanging 32, the second gas after turning back can not flow reversely, and the second gas after turning back can flow positively in the first gas outlet pipe 1.
In the process that the second gas after turning back flows forward in the first gas outlet pipe 1, the second gas after turning back and the second gas without turning back generate opposite impact, the flow resistance of the second gas without turning back is increased, and the flow speed of the second gas without turning back is gradually reduced until the second gas stops flowing. The second gas in the first outlet pipe 1 flows forward to enter the cylinder of the engine 102 to participate in combustion together with the first gas.
Referring to fig. 6, a second aspect of an embodiment of the present application provides an engine EGR system, including: the EGR cooler comprises an engine 102, an EGR inlet pipe 103, an EGR cooler 104 and an EGR mixer 105, wherein the EGR inlet pipe 103 is communicated with an exhaust manifold of the engine 102, the EGR cooler 104 is communicated with the EGR inlet pipe 103, the EGR mixer 105 is communicated with the intake manifold of the engine 102, and the EGR cooler 104 is communicated with the EGR mixer 105 through the backflow-preventing EGR outlet pipe 101 in any one of the embodiments.
The engine EGR system further includes a turbocharger whose turbine 106 communicates with the exhaust manifold of the engine 102, a turbocharger whose compressor 107 communicates with the EGR mixer 105 via an intercooler 108, and an EGR valve 109 provided on the backflow-preventing EGR outlet pipe 101 between the EGR cooler 104 and the EGR mixer 105.
The working principle and the working process of the engine EGR system are as follows: when the engine 102 is in a high-speed working condition, the front exhaust pressure of the turbine 106 is greater than the intake pressure of the engine 102, a part of exhaust gas in an exhaust manifold of the engine 102 enters the EGR inlet pipe 103, sequentially passes through the EGR cooler 104, the EGR valve and the backflow-preventing EGR outlet pipe 101 and enters the EGR mixer 105, the exhaust gas and fresh compressed air entering from the compressor 107 enter the intake manifold of the engine 102 after being mixed in the EGR mixer 105, and exhaust gas recirculation is achieved.
And because the anti-return EGR outlet pipe 101 is arranged in the engine EGR system, the positive flow of the waste gas is not influenced, and the engine EGR rate is ensured. When the engine 102 is in a low-speed and high-torque working condition, at the moment, fresh gas is compressed by the compressor 107 and cooled by the intercooler 108, then enters the EGR mixer 105 to be mixed with exhaust gas, and finally enters an intake manifold of the engine 102 to participate in-cylinder combustion to do work.
When the intake pressure of the engine 102 is greater than the front exhaust pressure of the turbine 106, the compressed gas will generate backflow, and because the anti-backflow EGR outlet pipe 101 is arranged in the engine EGR system, the anti-backflow EGR outlet pipe 101 can inhibit the backflow of the gas, thereby ensuring the smooth implementation of exhaust gas recirculation and improving the EGR rate.
The engine EGR system also comprises an EGR valve 109 arranged on the anti-backflow EGR outlet pipe 101 between the EGR cooler 104 and the EGR mixer 105, the on-off of the anti-backflow EGR outlet pipe 101 is controlled through the EGR valve 109, the EGR valve 109 is opened when the exhaust gas recirculation is needed, and the EGR valve 109 is closed when the exhaust gas recirculation is not needed.
After the anti-backflow EGR outlet pipe 101 is arranged in the engine EGR system, an EGR check valve does not need to be added independently, the cost of the engine EGR system is reduced, the anti-backflow EGR outlet pipe 101 is long in service life and free of maintenance, and the reliability and the service life of the engine EGR system are improved.
Principle of operation
The embodiment of the application provides an anti-backflow EGR (exhaust gas recirculation) outlet pipe and an engine EGR system, because the anti-backflow EGR outlet pipe 101 is provided with a first outlet pipe 1, one end of the first outlet pipe 1 is provided with a first vent hole 11, and the other end of the first outlet pipe 1 is provided with a second vent hole 12; the second air outlet pipe 2 comprises a straight-line section pipe body 21 and a bent section pipe body 22 which are communicated with each other, a third air vent 23 is formed in one end, far away from the bent section pipe body 22, of the straight-line section pipe body 21, and a fourth air vent 24 is formed in one end, far away from the straight-line section pipe body 21, of the bent section pipe body 22; the second vent 12 of the first outlet pipe 1 is communicated with the pipe wall of the straight-line pipe body 21, the fourth vent 24 of the bent pipe body 22 is communicated with the pipe wall of the first outlet pipe 1, and the fourth vent 24 of the bent pipe body 22 faces the second vent 12 of the first outlet pipe 1.
Therefore, when the first gas pressure on the first vent 11 side is greater than the second gas pressure on the third vent 23 side, the first gas of the backflow-preventing EGR gas outlet pipe 101 of the present application is divided into two paths after entering the first gas outlet pipe 1 from the first vent 11 forward, and the first gas enters the straight-line section pipe body 21 after entering the curved section pipe body 22 all the way. The other path of first gas directly enters the straight-line section pipe body 21 through the second vent hole 12, the two paths of first gas are mixed with the second gas after being converged in the straight-line section pipe body 21 and enter the engine 102 for participating in combustion, the resistance of the first gas in the backflow-preventing EGR outlet pipe 101 is small, and the forward smooth flowing of the first gas is guaranteed.
When the first gas pressure at the first air vent 11 side is lower than the second gas pressure at the third air vent 23 side, the second gas reversely enters the straight-section pipe body 21 from the third air vent 23 and is divided into two paths, and one path of the second gas enters the bent-section pipe body 22 and then flows out of the fourth air vent 24 and enters the first air outlet pipe 1; the other path of the second gas enters the first gas outlet pipe 1 from the second vent hole 12. Because the fourth vent 24 of the bending section pipe body 22 faces the second vent 12 of the first outlet pipe 1, the second gas flowing out of the fourth vent 24 collides with the second gas in the first outlet pipe 1, and the second gas in the first outlet pipe 1 returns to the straight section pipe body 21, so that the function of a check valve is achieved, and the second gas is prevented from flowing back in the anti-backflow EGR outlet pipe 101.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in this application, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. 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 application. Thus, the present application 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 anti-backflow EGR outlet pipe, comprising:
the air conditioner comprises a first air outlet pipe (1), wherein one end of the first air outlet pipe (1) is provided with a first vent hole (11), and the other end of the first air outlet pipe (1) is provided with a second vent hole (12);
the second air outlet pipe (2) comprises a straight line section pipe body (21) and a bent section pipe body (22) which are communicated with each other, a third air vent (23) is formed in one end, far away from the bent section pipe body (22), of the straight line section pipe body (21), and a fourth air vent (24) is formed in one end, far away from the straight line section pipe body (21), of the bent section pipe body (22);
the second vent hole (12) of the first air outlet pipe (1) is communicated with the pipe wall of the straight-line pipe body (21), the fourth vent hole (24) of the bent pipe body (22) is communicated with the pipe wall of the first air outlet pipe (1), and the fourth vent hole (24) of the bent pipe body (22) faces the second vent hole (12) of the first air outlet pipe (1);
the included angle between the first air outlet pipe (1) and the straight-line section pipe body (21) is 133-137 degrees;
and a fourth air port (24) of the bent section pipe body (22) extends into the first air outlet pipe (1) and extends towards the direction of a second air vent (12) of the first air outlet pipe (1).
2. An anti-backflow EGR outlet duct according to claim 1, further comprising:
when the first gas pressure at the first vent hole (11) side is smaller than the second gas pressure at the third vent hole (23) side, the second gas enters the straight-line section pipe body (21) from the third vent hole (23) and then is divided into two paths, and one path of the second gas enters the bent section pipe body (22) and then flows out from the fourth vent hole (24) and enters the first gas outlet pipe (1);
and the other path of second gas enters the first gas outlet pipe (1) through the second vent hole (12), the second gas flowing out of the fourth vent hole (24) and the second gas in the first gas outlet pipe (1) are in opposite impact, and the second gas in the first gas outlet pipe (1) is returned to the straight-section pipe body (21).
3. An anti-backflow EGR outlet duct according to claim 2, further comprising:
the pressure of the second gas flowing out of the fourth vent hole (24) is higher than that of the second gas entering the first gas outlet pipe (1) from the second vent hole (12).
4. An anti-backflow EGR outlet duct according to claim 1, further comprising:
the pipe wall of the first air outlet pipe (1) is provided with an annular groove (3) which protrudes outwards, and the notch of the annular groove (3) faces to the second vent hole (12) of the first air outlet pipe (1).
5. An anti-backflow EGR outlet duct according to claim 4, wherein:
the annular groove (3) comprises a bell mouth (31) which is gradually reduced along the axial diameter of the first air outlet pipe (1), and a circular arc-shaped flanging (32) which is positioned at the inlet end of the bell mouth (31) and is inwards curled.
6. An anti-backflow EGR outlet duct according to claim 4, wherein:
the annular grooves (3) are arranged in a plurality of intervals, the annular grooves (3) are arranged along the axis direction of the first air outlet pipe (1), and the adjacent two annular grooves (3) are connected through the first air outlet pipe (1).
7. An engine EGR system, comprising: an engine (102), an EGR inlet pipe (103), an EGR cooler (104) and an EGR mixer (105), wherein the EGR inlet pipe (103) is communicated with an exhaust manifold of the engine (102), the EGR cooler (104) is communicated with the EGR inlet pipe (103), the EGR mixer (105) is communicated with an intake manifold of the engine (102), and the EGR cooler (104) and the EGR mixer (105) are communicated with each other through the backflow-preventing EGR outlet pipe (101) of any one of claims 1-6.
8. An engine EGR system as defined in claim 7 wherein:
the EGR cooler is characterized by further comprising a turbocharger, an intercooler (108) and an EGR valve (109), wherein a turbine (106) of the turbocharger is communicated with an exhaust manifold of the engine (102), a compressor (107) of the turbocharger is communicated with the EGR mixer (105) through the intercooler (108), and the EGR valve (109) is arranged on an anti-backflow EGR outlet pipe (101) between the EGR cooler (104) and the EGR mixer (105).
CN202110801206.4A 2021-07-15 2021-07-15 Backflow-preventing EGR (exhaust gas Recirculation) outlet pipe and engine EGR system Active CN113482807B (en)

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CN203822496U (en) * 2014-03-21 2014-09-10 东风商用车有限公司 EGR (exhaust gas recirculation) gas-collection pipe structure
CN204003192U (en) * 2014-08-25 2014-12-10 安徽江淮汽车股份有限公司 Intake manifold and motor
CN207945014U (en) * 2017-12-27 2018-10-09 潍柴动力股份有限公司 One kind preventing pulse counterflow unit and engine charge bypass system
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