CN113389663A - EGR pipeline system for engine - Google Patents

EGR pipeline system for engine Download PDF

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Publication number
CN113389663A
CN113389663A CN202110897512.2A CN202110897512A CN113389663A CN 113389663 A CN113389663 A CN 113389663A CN 202110897512 A CN202110897512 A CN 202110897512A CN 113389663 A CN113389663 A CN 113389663A
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CN
China
Prior art keywords
egr
inlet pipe
pipe
communicated
manifold assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110897512.2A
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Chinese (zh)
Inventor
喻奇伟
王岳宇
陈国良
钟石
秦涛
尤斌
李华建
陈中位
肖根
曾军
姚鹏
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Chongqing Xinyuan Power Manufacturing Co ltd
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Chongqing Xinyuan Power Manufacturing Co ltd
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Priority to CN202110897512.2A priority Critical patent/CN113389663A/en
Publication of CN113389663A publication Critical patent/CN113389663A/en
Pending legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • 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
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust 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
    • F02M26/17—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
    • F02M26/17—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
    • F02M26/21—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 with EGR valves located at or near the connection 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
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • 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
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • 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 invention discloses an EGR pipeline system for an engine, which is arranged between an exhaust manifold assembly and an intake manifold assembly and comprises an EGR valve, wherein the EGR valve is communicated with the intake manifold assembly through an EGR outlet pipe and is communicated with the exhaust manifold assembly through an EGR cooling pipe; the EGR cooling pipe comprises an EGR inlet pipe, the air inlet end of the EGR inlet pipe is communicated with the exhaust manifold assembly, the air outlet end of the EGR inlet pipe is communicated with the EGR valve, a cooling sleeve with a sealing structure is arranged outside the EGR inlet pipe, one end of the cooling sleeve is communicated with a water inlet pipe communicated with a water path of the engine, and the other end of the cooling sleeve is communicated with a water outlet pipe; when the EGR valve is used, the EGR valve is opened under the controlled state, the exhaust gas in the exhaust manifold assembly enters the EGR air inlet pipe, and the coolant exchanges heat with the exhaust gas in the EGR air inlet pipe in the cooling sleeve pipe through the action of the coolant conveyed into the water inlet pipe by the engine water way in the flowing process of the EGR air inlet pipe, so that the temperature of the internal exhaust gas is reduced.

Description

EGR pipeline system for engine
Technical Field
The invention relates to the technical field of automobile braking equipment, in particular to an EGR pipeline system for an engine.
Background
EGR (exhaust Gas recirculation) is exhaust Gas recirculation. It is an exhaust gas purification device provided for nitrogen oxides NOx which is one of harmful gases in engine exhaust gas. N is a radical of2Is an inert gas and is not easily oxidized, but is oxidized to NO at a high temperature to some extentX. Therefore, the reduction of NOXIn addition, it is necessary to try to lower the combustion temperature of the engine.
The method used by the current vehicle is that some burnt exhaust gas is led into an air inlet pipe and mixed with fresh air to be combusted again, and the method has the functions of reducing the oxygen-containing concentration of the mixed gas, absorbing the heat released by combustion, slowing down the combustion speed, reducing the combustion temperature and reducing the generation amount of NOx.
An engine control computer (ECU) controls an EGR electromagnetic valve to be opened at any time according to the rotating speed, the load (throttle opening), the temperature, the air inlet flow and the exhaust temperature of the engine, and a small part of exhaust gas in the exhaust enters an air inlet system through an EGR valve, is mixed with mixed gas and then enters a cylinder to participate in combustion.
However, excessive exhaust gas is involved in recirculation, which affects the ignition performance of the mixture and thus the engine dynamics, and particularly, the recirculated exhaust gas significantly affects the engine performance at idle, low speed, light load, and cold engine. Therefore, the EGR stops working under the working condition, and when the engine exceeds a certain rotating speed, load and reaches a certain temperature, the ECU controls the EGR system to start working; under the condition of cold weather, a driver usually uses warm air for heating under an in-situ idling working condition in the process of waiting for loading and unloading goods, and combustion waste gas of an engine throttle valve is easy to freeze when being cooled for a long time, so that a series of fault conditions such as flameout or incapability of starting the engine in the running process are caused.
Moreover, because the existing vehicle adopts a pressure stabilizing cavity of an EGR waste gas intake manifold assembly or an air passage of a cylinder cover, the mixing of waste gas and fresh air is not uniform, the thermal efficiency is not high, and the oil consumption cannot be improved (an EGR system is cancelled in part of host factories); the EGR cooling system is a separate cooling device and is relatively costly.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an EGR pipeline system for an engine, which can accelerate the warm air heat engine and solve the problems of freezing of a PCV valve pipeline and freezing of a throttle valve of the engine.
The technical scheme adopted by the invention is as follows:
an EGR pipeline system for an engine, which is arranged between an exhaust manifold assembly and an intake manifold assembly, comprises an EGR valve, wherein the EGR valve is communicated with the intake manifold assembly through an EGR outlet pipe, and is communicated with the exhaust manifold assembly through an EGR cooling pipe; the EGR cooling pipe comprises an EGR inlet pipe, the air inlet end of the EGR inlet pipe is communicated with the exhaust manifold assembly, the air outlet end of the EGR inlet pipe is communicated with the EGR valve, a cooling sleeve with a sealing structure is arranged outside the EGR inlet pipe, one end of the cooling sleeve is communicated with a water inlet pipe communicated with a water path of the engine, and the other end of the cooling sleeve is communicated with a water outlet pipe;
when the EGR valve is used, the EGR valve is opened under the controlled state, the exhaust gas in the exhaust manifold assembly enters the EGR air inlet pipe, and the coolant exchanges heat with the exhaust gas in the EGR air inlet pipe in the cooling sleeve pipe through the action of the coolant conveyed into the water inlet pipe by the engine water way in the flowing process of the EGR air inlet pipe, so that the temperature of the internal exhaust gas is reduced.
This scheme is through the waste gas that EGR valve control got into the EGR cooling tube from exhaust manifold assembly to control EGR outlet duct and get into the exhaust gas volume of air intake manifold assembly, because the EGR cooling tube includes the EGR intake pipe, be equipped with the cooling jacket who is seal structure outside the EGR intake pipe, cooling jacket one end intercommunication has the inlet tube with engine water route intercommunication, other end intercommunication has the outlet pipe, make the coolant liquid in engine water route flow in the cooling jacket who is seal structure through the inlet tube intraductal, and EGR valve and EGR intake pipe intercommunication.
The exhaust manifold assembly in have certain thermal waste gas will reach EGR valve department through the EGR intake pipe, waste gas in the EGR intake pipe is at the in-process that flows, the EGR intake pipe that is located the cooling jacket internal portion is cooled down through the coolant liquid in the cooling jacket, the heat of waste gas in the EGR intake pipe is taken away through the outlet pipe, the temperature of the coolant liquid in the outlet pipe will rise like this, reentrant car warm braw water route, can accelerate the warm braw heat engine, the warm braw effect is provided, warm braw effect in advance has, the effect of emission is reduced.
The exhaust gas temperature of the exhaust manifold assembly is about 850 ℃, after the exhaust gas is cooled by the EGR cooling pipe, the exhaust gas temperature at the EGR valve can be reduced to be lower than 330 ℃, the temperature at the intake manifold assembly is reduced to be lower than 250 ℃, the temperature of cold air at the position where the exhaust gas is mixed with the cold air can be increased by 50 ℃ at most, and therefore the PCV valve pipeline and the throttle valve of the engine can be prevented from being frozen, and the mixed gas enters the combustion chamber through the intake manifold assembly.
Further, still include the EGR mount pad, the EGR mount pad sets up on the cylinder head of engine, be equipped with three port on the EGR mount pad, three port communicates with EGR valve, EGR cooling tube and inlet tube respectively.
This scheme adopts the EGR mount pad for convenient later stage maintenance, because three port on the EGR mount pad communicates with EGR valve, EGR cooling tube and inlet tube respectively, consequently, regards the end that converges of EGR valve, EGR cooling tube and inlet tube with the EGR mount pad, conveniently looks over the part and overhauls.
Further, an air inlet of the EGR air outlet pipe, which is communicated with the air inlet manifold assembly, and the throttle valve are positioned on the same side face and adjacent to each other, and the air inlet end of the air inlet manifold assembly is communicated with the air outlet end of the EGR air outlet pipe.
According to the design, the exhaust gas enters the air inlet end of the air inlet manifold assembly through the air outlet end of the EGR air outlet pipe, the air inlet end of the air inlet manifold assembly is located on the same side face as the throttle valve, and the positions of the exhaust gas and the throttle valve are close to each other, so that the exhaust gas in the EGR air outlet pipe is mixed with the fresh air entering from the throttle valve (the exhaust gas and the fresh air are fully mixed), the mixed gas can be increased by 50 ℃ to the maximum extent, the local temperature of the rear end of the throttle valve is provided, and the problem of throttle valve icing is effectively solved.
When an engine PCV pipe is frozen and blocked, a large amount of oil-gas mixture passes through the crankshaft ventilation pipe and is frozen at the junction of the crankshaft ventilation pipe and the clean air pipe, so that the pressure of a crankcase is high, oil flushing can occur, lubricating oil flows out, and faults such as cylinder pulling, tile pulling and the like are caused.
Meanwhile, the waste gas and the fresh air are uniformly mixed in front of a pressure stabilizing cavity of the intake manifold assembly, so that the phenomenon of nonuniform intake flow of each cylinder body in the cylinder cover can be effectively prevented, and the detonation problem is reduced, thereby solving the technical problem of nonuniform mixing caused by mixing in the pressure stabilizing cavity or the cylinder cover air passage in the prior art.
Furthermore, the cooling jacket is of a cylindrical structure, and the water inlet pipe and the water outlet pipe are respectively arranged on the same plane with the connecting line of the cooling jacket and distributed on two sides of the central axis of the cooling jacket. By the design, the cooling liquid can be uniformly convected in the cooling sleeve.
Furthermore, an EGR air inlet pipe positioned in the cooling sleeve adopts a corrugated pipe structure. By the design, the surface of the EGR air inlet pipe in the cooling sleeve forms a concave-convex curved surface through the corrugated pipe structure, the contact area is increased, and the cooling efficiency is improved.
Furthermore, the pipeline of the EGR installation seat connected with the air outlet end of the EGR air inlet pipe adopts a corrugated pipe structure. By means of the design, the assembling error is adjusted by utilizing the flexibility of the corrugated pipe, the manufacturing precision requirement of parts is reduced, and the stress generated by the parts after assembly can be relieved.
Furthermore, the air inlet end of the EGR air inlet pipe is in threaded connection with the exhaust manifold assembly. Due to the design, the exhaust gas recirculation system is convenient to maintain, disassemble and replace, avoids the phenomenon that other connecting pieces are replaced simultaneously and reduces the maintenance cost due to the fact that the EGR gas inlet pipe or the exhaust manifold assembly is damaged singly.
Compared with the prior art, the invention has the following advantages:
according to the invention, the cooling sleeve with a sealing structure is arranged outside the EGR inlet pipe, one end of the cooling sleeve is communicated with the water inlet pipe, the water inlet pipe is communicated with the EGR cooler arranged in the cylinder cover, the other end of the cooling sleeve is communicated with the water outlet pipe, the air inlet end of the EGR inlet pipe is communicated with the exhaust manifold assembly, and the air outlet end of the EGR inlet pipe is communicated with the EGR mounting seat, so that the cooling sleeve is divided into two layers, the inner layer is a flowing layer of waste gas of the EGR inlet pipe, and the outer layer is a flowing layer of cooling liquid, so that the heat exchange position of the cooling liquid and the waste gas is realized at the cooling sleeve, the heat of the waste gas is reduced, and the heat taken away by the cooling liquid returns to an automobile warm air water channel, thereby accelerating a warm air heater, providing a warm air effect, having an early warming effect and reducing emission; in addition, the waste gas after cooling by the cooling liquid enters the intake manifold assembly through the EGR valve, and the air inlet end of the intake manifold assembly and the air throttle are positioned on the same side and adjacent to each other, so that the waste gas and the fresh air are uniformly mixed before the intake manifold assembly, the phenomenon of non-uniform air inlet flow of each cylinder body in the cylinder cover can be effectively prevented, the detonation problem is reduced, and the technical problem of non-uniform mixing caused by mixing in a pressure stabilizing cavity or a cylinder cover air passage in the prior art is solved.
Drawings
FIG. 1 is a schematic diagram of an EGR conduit system for an engine according to the present invention;
FIG. 2 is a flow chart of the exhaust gas recirculation for the EGR conduit system of the engine of the present invention;
FIG. 3 is a schematic illustration of the exhaust port and throttle position in an EGR conduit system for an engine according to the present invention;
FIG. 4 is a schematic diagram of an EGR cooling tube of an EGR conduit system for an engine according to the present invention.
In the figure: the EGR system comprises an exhaust manifold assembly 1, an EGR mounting seat 2, an EGR valve 3, an EGR cooling pipe 4, a water inlet pipe 5, a water outlet pipe 6, an EGR gas outlet pipe 7, an air inlet manifold assembly 8, a cylinder cover 9, a mounting head 10, a throttle valve 11, an EGR gas inlet pipe 12 and a cooling sleeve 13.
Detailed Description
The invention will be described in connection with the following figures and examples.
In this embodiment: referring to fig. 1 to 4, an EGR pipeline system for an engine, which is arranged between an exhaust manifold assembly 1 and an intake manifold assembly 8, is characterized in that the system comprises an EGR valve 3, the EGR valve 3 is communicated with the intake manifold assembly 8 through an EGR outlet pipe 7, and the EGR valve 3 is communicated with the exhaust manifold assembly 1 through an EGR cooling pipe 4; the EGR cooling pipe 4 comprises an EGR inlet pipe 12, the inlet end of the EGR inlet pipe 12 is communicated with the exhaust manifold assembly 1, the outlet end is communicated with the EGR valve 3, a cooling sleeve 13 with a sealing structure is arranged outside the EGR inlet pipe 12, one end of the cooling sleeve 13 is communicated with a water inlet pipe 5 communicated with a water path of the engine, and the other end of the cooling sleeve is communicated with a water outlet pipe 6;
when the EGR valve is used, the EGR valve 3 is opened under the controlled state, the exhaust gas in the exhaust manifold assembly 1 enters the EGR inlet pipe 12, and the coolant exchanges heat with the exhaust gas in the EGR inlet pipe 12 in the cooling sleeve 13 through the action of the coolant conveyed into the water inlet pipe 5 by the engine water way in the flowing process of the EGR inlet pipe 12, so that the temperature of the internal exhaust gas is reduced.
The scheme controls the waste gas entering the EGR cooling pipe 4 from the exhaust manifold assembly 1 through the EGR valve 3, thereby controlling the amount of the waste gas entering the intake manifold assembly 8 from the EGR outlet pipe 7, because the EGR cooling pipe 4 comprises an EGR inlet pipe 12, a cooling sleeve 13 with a sealing structure is arranged outside the EGR inlet pipe 12, one end of the cooling sleeve 13 is communicated with an inlet pipe 5 communicated with an engine water path, and the other end is communicated with an outlet pipe 6, so that the cooling liquid in the engine water path flows into the cooling sleeve 13 with the sealing structure through the inlet pipe, the EGR valve 3 is communicated with the EGR inlet pipe 12, the waste gas with certain heat in the exhaust manifold assembly 1 can reach the EGR valve 3 through the EGR inlet pipe 12, the waste gas in the EGR inlet pipe 12 is cooled through the cooling liquid in the cooling sleeve 13 in the flowing process, and the heat of the waste gas in the EGR inlet pipe 12 is taken away through the outlet pipe 6, the temperature of the coolant liquid in the water outlet pipe 6 will rise like this, reentrant car warm braw water route can accelerate the warm braw heat engine, provides the warm braw effect, has the warm-up effect in advance, reduces the effect of discharging.
According to the scheme, the highest temperature of the exhaust gas of the exhaust manifold assembly is about 850 ℃, after the exhaust gas is cooled by the EGR cooling pipe 4, the temperature of the exhaust gas at the EGR valve 3 can be reduced to be lower than 330 ℃, the temperature at the inlet manifold assembly 8 is reduced to be lower than 250 ℃, the temperature of the cold air at the position where the exhaust gas is mixed with the cold air can be increased by 50 ℃, so that the engine throttle valve 11 can be prevented from being frozen, and the mixed gas enters a combustion chamber through the inlet manifold assembly 8.
Preferably, the EGR device further comprises an EGR mounting seat 2, wherein the EGR mounting seat 2 is arranged on a cylinder head 9 of the engine, and three ports are arranged on the EGR mounting seat 2 and are respectively communicated with the EGR valve 3, the EGR cooling pipe 4 and the water inlet pipe 5.
This scheme adopts EGR mount pad 2 is for convenient later stage maintenance, because three port on the EGR mount pad 2 communicates with EGR valve 3, EGR cooling tube 4 and inlet tube 5 respectively, consequently, regards the end that converges of EGR valve 3, EGR cooling tube 4 and inlet tube 5 with EGR mount pad 2, conveniently looks over the part and overhauls.
Preferably, the air inlet of the EGR outlet pipe 7 leading to the intake manifold assembly 8 and the throttle valve 11 are located on the same side, and the positions of the air inlet and the throttle valve are adjacent, and the air inlet end of the intake manifold assembly 8 is communicated with the air outlet end of the EGR outlet pipe 7.
Through the design, the exhaust gas enters the air inlet end of the air inlet manifold assembly 8 through the air outlet end of the EGR air outlet pipe 7, the air inlet end of the air inlet manifold assembly 8 and the throttle valve 11 are positioned on the same side surface, and the positions of the air inlet end and the throttle valve 11 are adjacent, so that the exhaust gas in the EGR air outlet pipe 7 is mixed with the fresh air entering from the throttle valve 11 (the exhaust gas and the fresh air are fully mixed), the mixed gas can be increased by 50 ℃ to the maximum extent, the local temperature of the rear end of the throttle valve 11 is provided, and the problem of icing of the throttle valve 11 is effectively solved; meanwhile, the waste gas and the fresh air are uniformly mixed before the intake manifold assembly 8, so that the phenomenon of nonuniform intake flow of each cylinder body in the cylinder cover 9 can be effectively prevented, and the detonation problem is reduced, thereby solving the technical problem of nonuniform mixing caused by mixing in a pressure stabilizing cavity or a cylinder cover air passage in the prior art.
Preferably, the cooling jacket 13 is a cylindrical structure, and the water inlet pipe 5 and the water outlet pipe 6 are respectively on the same plane with the connecting line of the cooling jacket 13 and distributed on both sides of the central axis of the cooling jacket 13. By such a design, the cooling liquid can be convected uniformly in the cooling jacket 13.
Preferably, the EGR gas intake pipe 12 located inside the cooling jacket 13 is of a bellows structure. By the design, the surface of the EGR air inlet pipe 12 positioned in the cooling sleeve 13 forms a concave-convex curved surface through the corrugated pipe structure, so that the contact area is increased, and the cooling efficiency is improved.
Preferably, a pipeline of the outlet end of the EGR inlet pipe 12 connected with the EGR mounting seat 2 adopts a bellows structure. By means of the design, the assembling error is adjusted by utilizing the flexibility of the corrugated pipe, the manufacturing precision requirement of parts is reduced, and the stress generated by the parts after assembly can be relieved.
Preferably, the intake end of the EGR intake pipe 12 is screwed to the exhaust manifold assembly. Due to the design, the maintenance, the disassembly and the replacement are convenient, the simultaneous replacement of other connecting pieces caused by the damage of a single EGR air inlet pipe 12 or an exhaust manifold assembly is avoided, and the maintenance cost is reduced.
According to the invention, the cooling sleeve 13 with a sealing structure is arranged outside the EGR inlet pipe 12, one end of the cooling sleeve 13 is communicated with the water inlet pipe 5, the water inlet pipe 5 is communicated with the EGR cooler arranged in the cylinder cover 9, the other end of the cooling sleeve is communicated with the water outlet pipe 6, the air inlet end of the EGR inlet pipe 12 is communicated with the exhaust manifold assembly 1, and the air outlet end of the EGR inlet pipe 12 is communicated with the EGR mounting seat 2, so that the cooling sleeve 13 is divided into two layers, the inner layer is a flowing layer of waste gas of the EGR inlet pipe 12, and the outer layer is a flowing layer of cooling liquid, so that the heat exchange between the cooling liquid and the waste gas is realized at the cooling sleeve 13, the heat of the waste gas is reduced, and the heat taken away by the cooling liquid returns to an automobile warm air water channel, thereby accelerating the warm air heat engine, providing a warm air effect, having an early warming effect and reducing emission; therefore, when the engine is started, part of exhaust gas is discharged to heat the cooling liquid (the water temperature of the cooling pipe and the water outlet pipe is quickly raised), so that the rapid warming-up is realized, and the emission is reduced; when the warm air switch is turned on, the warm air effect is increased (the temperature of the cab is increased quickly).
In addition, the exhaust gas cooled by the cooling liquid enters the intake manifold assembly 8 through the EGR valve 3, and the air inlet end of the intake manifold assembly 8 and the throttle valve 11 are positioned on the same side and adjacent to each other, so that the exhaust gas and the fresh air are uniformly mixed before the intake manifold assembly 8, the phenomenon of non-uniform air inlet flow of each cylinder body in the cylinder cover 9 can be effectively prevented, the detonation problem is reduced, and the technical problem of non-uniform mixing caused by mixing in a pressure stabilizing cavity or a cylinder cover air passage in the prior art is solved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.

Claims (8)

1. An EGR pipeline system for an engine, which is arranged between an exhaust manifold assembly (1) and an intake manifold assembly (8), and is characterized by comprising an EGR valve (3), wherein the EGR valve (3) is communicated with the intake manifold assembly (8) through an EGR outlet pipe (7), and the EGR valve (3) is communicated with the exhaust manifold assembly (1) through an EGR cooling pipe (4); the EGR cooling pipe (4) comprises an EGR air inlet pipe (12), the air inlet end of the EGR air inlet pipe (12) is communicated with the exhaust manifold assembly (1), the air outlet end of the EGR air inlet pipe is communicated with the EGR valve (3), a cooling sleeve (13) in a sealing structure is arranged outside the EGR air inlet pipe (12), one end of the cooling sleeve (13) is communicated with an inlet pipe (5) communicated with an engine water channel, and the other end of the cooling sleeve (13) is communicated with an outlet pipe (6);
when the EGR valve is used, the EGR valve (3) is opened under the controlled state, exhaust gas in the exhaust manifold assembly (1) enters the EGR air inlet pipe (12), and in the flowing process of the EGR air inlet pipe (12), the coolant exchanges heat with the exhaust gas in the EGR air inlet pipe (12) in the cooling sleeve (13) through the action of coolant conveyed into the water inlet pipe (5) by the engine water way, so that the temperature of the internal exhaust gas is reduced.
2. The EGR pipeline system for the engine according to claim 1, further comprising an EGR mounting seat (2), wherein the EGR mounting seat (2) is arranged on a cylinder head (9) of the engine, and three ports are arranged on the EGR mounting seat (2) and are respectively communicated with the EGR valve (3), the EGR cooling pipe (4) and the water inlet pipe (5).
3. The EGR conduit system for an engine according to claim 1, wherein the intake port of the EGR outlet pipe (7) leading to the intake manifold assembly (8) is located on the same side as the throttle valve (11) and is located adjacent thereto.
4. The EGR pipe system for engine according to claim 1, wherein the cooling jacket (13) is a cylindrical structure, and the water inlet pipe (5) and the water outlet pipe (6) are distributed on both sides of the central axis of the cooling jacket (13).
5. EGR pipe system for engines according to claim 4 characterized in that the inlet pipe (5) and the outlet pipe (6) are in the same plane with the connecting line of the cooling jacket (13), respectively.
6. EGR line system for engines according to claim 4, characterized in that the EGR inlet pipe (12) inside the cooling jacket (13) is of bellows construction.
7. The EGR pipeline system for the engine according to claim 1, characterized in that the pipeline of the EGR inlet pipe (12) with the outlet end connected with the EGR mounting seat (2) adopts a bellows structure.
8. The EGR conduit system for an engine of any of claims 1, 6 and 7 wherein a threaded connection is employed between the intake end of the EGR intake pipe (12) and the exhaust manifold assembly.
CN202110897512.2A 2021-08-05 2021-08-05 EGR pipeline system for engine Pending CN113389663A (en)

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Application publication date: 20210914