Egr mixing structure, engine system, and vehicle

Abstract

The application provides an EGR mixing structure, an engine system and a vehicle, and belongs to the technical field of engines. The EGR mixing structure is characterized in that a mixing pipe body is provided with a first air inlet, a second air inlet and an air outlet; one of the first air inlet and the second air inlet is used for inhaling fresh air, and the other of the first air inlet and the second air inlet is used for inhaling EGR exhaust gas; the air outlet is used for discharging the mixed fresh air and EGR exhaust gas; the first air inlet and the second air inlet are located at an axial first end portion of the mixing pipe body, and the air outlet is located at an axial second end portion of the mixing pipe body; a first axis of a gas flow field of the first air inlet and a second axis of a gas flow field of the second air inlet intersect, and the distance from the intersection point to the air outlet is L, wherein L is greater than or equal to 40 mm. The mixing stroke of the application is relatively long, which can ensure that the fresh air and the EGR exhaust gas are uniformly mixed, so as to improve the EGR utilization rate of the engine system and reduce the emission of nitrogen oxides.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to an EGR mixing structure, an engine system and a vehicle. BACKGROUND

[0002] With the continuous tightening of fuel consumption indicators, EGR (Exhaust Gas Recirculation) has become a standard technology for high-efficiency engines, and the EGR rate is getting higher and higher, and the proportion of participating in engine operating conditions is getting larger and larger. The design of the EGR mixing structure has a great influence on the reliability of the entire system and the reliability of the supercharger.

[0003] In the related art, the commonly used EGR mixing scheme is as shown in Figure 1 A three-way structure is designed upstream of the supercharger, and the crankcase ventilation system is arranged before the EGR inlet. However, this scheme will cause uneven mixing of EGR gas and fresh air, and then condensate will be precipitated, and the oil-water mixture produced will invade the supercharger, which will cause damage to the supercharger. SUMMARY

[0004] The present application provides an EGR mixing structure, an engine system and a vehicle, which can solve the problem of oil-water mixture invading the supercharger and causing damage to the supercharger.

[0005] The technical solution is as follows:

[0006] On the one hand, an EGR mixing structure is provided, which comprises: a mixing pipe body;

[0007] The mixing pipe body is provided with a first air inlet, a second air inlet and an air outlet;

[0008] One of the first air inlet and the second air inlet is used to suck in fresh air, and the other of the first air inlet and the second air inlet is used to suck in EGR exhaust gas, and the air outlet is used to discharge mixed fresh air and EGR exhaust gas;

[0009] The first air inlet and the second air inlet are located at an axial first end portion of the mixing pipe body, and the air outlet is located at an axial second end portion of the mixing pipe body;

[0010] The first axis of the gas flow field of the first air inlet and the second axis of the gas flow field of the second air inlet intersect, and the distance from the intersection point to the air outlet is L, wherein L≥40mm.

[0011] In some embodiments, the extension line of the third axis of the mixing pipe body intersects the first air inlet, and the first air inlet is provided with a first connecting flange for connecting a back pressure valve assembly.

[0012] In some embodiments, the back pressure valve assembly comprises a back pressure valve body and a bracket, the back pressure valve body is connected with the bracket;

[0013] The bracket is provided with a first connecting part and a second connecting part;

[0014] The first connecting part is connected with the first connecting flange, for fixing the relative position of the back pressure valve body and the first air inlet and for communication;

[0015] The second connecting part is connected with the engine cylinder head, for supporting the back pressure valve assembly.

[0016] In some embodiments, the second air inlet is located at the side of the first end of the mixing pipe body, and the second axis of the gas flow field of the second air inlet intersects with the third axis of the mixing pipe body.

[0017] In some embodiments, the first air inlet is used for sucking fresh air, and the second air inlet is used for sucking EGR exhaust gas;

[0018] In the working state of the EGR mixing structure, the second air inlet is located at the top surface in the vertical direction or the side surface in the horizontal direction of the first end of the mixing pipe body.

[0019] In some embodiments, the second air inlet is used for sucking EGR exhaust gas, and the second axis of the gas flow field of the second air inlet and the third axis of the mixing pipe body have an included angle A, where A≥80°.

[0020] In some embodiments, the EGR mixing structure further comprises an EGR valve, the EGR valve is in communication with the first air inlet or the second air inlet, and the EGR valve is used for controlling the flow of EGR exhaust gas.

[0021] In some embodiments, the EGR mixing structure further comprises a quick connector assembly, the quick connector assembly is located at the gas outlet, and the gas outlet is connected with the air inlet of the turbocharger by using the quick connector assembly;

[0022] The quick connector assembly comprises a connector body, an elastic clamping piece and a sealing ring, the elastic clamping piece and the sealing ring are respectively located on the inner wall of the connector body, the elastic clamping piece is used for clamping in the mounting groove of the counter connector, and the sealing ring is used for realizing the sealed connection of the connector body and the counter connector.

[0023] In another aspect, an engine system is provided, the engine system comprises the EGR mixing structure, the turbo pipe and the turbocharger described in the present application.

[0024] The curved pipe is communicated with the first air inlet or the second air inlet, and the curved pipe is used for supplying EGR exhaust gas to the first air inlet or the second air inlet.

[0025] The turbocharger is communicated with the air outlet, and the turbocharger is used for compressing the mixed fresh air and EGR exhaust gas.

[0026] In another aspect, a vehicle is provided, which comprises the EGR mixing structure or the engine system provided in the application.

[0027] The technical scheme provided in the application has at least the following beneficial effects:

[0028] The EGR mixing structure provided in the application is characterized in that the first end of the mixing pipe body is arranged with the first air inlet and the second air inlet, one of which is used for inhaling fresh air and the other of which is used for inhaling EGR exhaust gas, the second end of the mixing pipe body is arranged with the air outlet, the fresh air and the EGR exhaust gas can be fully mixed during the flow from the first end to the second end, the intersection point of the gas flow field axis of the first air inlet and the gas flow field axis of the second air inlet is at a distance L of 40 mm or more from the air outlet, the mixing distance of the fresh air and the EGR exhaust gas is relatively long, which can ensure the uniform mixing of the fresh air and the EGR exhaust gas, thereby improving the EGR utilization rate of the engine system and reducing the emission of nitrogen oxides. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0030] Figure 1 is a structural schematic diagram of an EGR mixing scheme in the related art;

[0031] Figure 2 is a structural schematic diagram of an EGR mixing structure provided in an embodiment of the application;

[0032] Figure 3 is a structural top view of a connection state of a mixing pipe body and a turbocharger provided in an embodiment of the application;

[0033] Figure 4 is a structural schematic diagram of an air outlet provided in an embodiment of the application;

[0034] Figure 5 is a structural block diagram of an engine system provided in an embodiment of the application.

[0035] The reference signs in the drawings represent the following respectively:

[0036] 10, EGR mixing structure; 20, bypass pipe; 30, turbocharger;

[0037] 001, first axis; 002, second axis; 003, third axis;

[0038] 1, mixing pipe body;

[0039] 101, first end; 102, second end;

[0040] 11, first air inlet; 12, second air inlet; 13, air outlet; 14, first connecting flange; 15, second connecting flange;

[0041] 2, back pressure valve assembly;

[0042] 21, back pressure valve body; 211, back pressure valve air inlet; 22, bracket;

[0043] 3, EGR valve;

[0044] 4, quick connector assembly;

[0045] 41, connector body; 42, elastic clamping piece; 43, sealing ring;

[0046] 5, air inlet hose. DETAILED DESCRIPTION

[0047] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, unless otherwise indicated, like numbers in the attached drawings refer to the same or similar elements. The following detailed description includes specific details for the purpose of providing a thorough understanding of the exemplary embodiments. However, it will be apparent to those skilled in the art that the exemplary embodiments can be practiced without these specific details. In some instances, well-known structures and components are not described in detail in order to avoid obscuring the understanding of the present description.

[0048] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Figure 2 The orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as those generally understood by one of ordinary skill in the art.

[0050] EGR is the abbreviation of Exhaust Gas Recirculation. Exhaust gas recirculation refers to the part of the exhaust gas discharged by the engine is returned to the intake manifold and enters the cylinder again with fresh mixture. Since the exhaust gas contains a large amount of carbon dioxide and other multi-atomic gases, and the carbon dioxide and other gases cannot burn but absorb a large amount of heat due to their high specific heat capacity, the maximum combustion temperature of the mixture in the cylinder is reduced, thereby reducing the amount of nitrogen oxides generated.

[0051] EGR mainly plays a role in the following aspects: carbon dioxide and water vapor in EGR greatly increase the specific heat capacity of the working medium, and the addition of exhaust gas also dilutes the oxygen concentration in the original mixture, so that the combustion speed is slowed down, the maximum temperature and average temperature in the combustion process are lowered, and the favorable environment for the generation of nitrogen oxides is destroyed, thereby greatly reducing the emission of nitrogen oxides. Because the load regulation mode of the gasoline engine is usually volume regulation, the application of EGR on the gasoline engine can correspondingly increase the intake air volume, and the increase of the EGR rate can reduce the throttling loss of the gasoline engine under medium and low load conditions, and reduce the fuel consumption rate of the gasoline engine.

[0052] Figure 1 An EGR mixing scheme in the related art is shown, which utilizes a three-way structure, wherein the left joint is connected to fresh air, the bottom interface is connected to EGR exhaust gas, and the right interface discharges the mixed fresh air and EGR exhaust gas. On the one hand, the travel distance from the intersection point of fresh air and EGR exhaust gas to the outlet is short, and it is difficult to ensure that the two kinds of gas are fully mixed, and uneven gas mixing can further exacerbate the precipitation of condensed water, and the condensed water entering the turbocharger can cause damage to the impeller. On the other hand, the inlet of the EGR exhaust gas is located at the bottom of the three-way structure, and the colloidal substance formed by the mixture of oil gas and the carbon deposition brought by the exhaust gas can enter the intake pipe, causing corrosion and jamming of the control valve.

[0053] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0054] On the one hand, in combination with Figures 2-4 As shown in the figure, the present embodiment provides an EGR mixing structure 10, which comprises a mixing pipe body 1.

[0055] The mixing pipe body 1 is provided with a first air inlet 11, a second air inlet 12 and an air outlet 13; one of the first air inlet 11 and the second air inlet 12 is used to suck in fresh air, and the other of the first air inlet 11 and the second air inlet 12 is used to suck in EGR exhaust gas; and the air outlet 13 is used to discharge the mixed fresh air and EGR exhaust gas.

[0056] Exemplarily, the first air inlet 11 is used to suck in fresh air, and the second air inlet 12 is used to suck in EGR exhaust gas. Alternatively, the first air inlet 11 is used to suck in EGR exhaust gas, and the second air inlet 12 is used to suck in fresh air.

[0057] The first air inlet 11 and the second air inlet 12 are located at an axial first end 101 of the mixing pipe body 1, and the air outlet 13 is located at an axial second end 102 of the mixing pipe body 1; a first axis 001 of a gas flow field of the first air inlet 11 and a second axis 002 of a gas flow field of the second air inlet 12 intersect, and a distance from an intersection point to the air outlet 13 is L, where L≥40mm.

[0058] The EGR mixing structure 10 of the embodiment is characterized in that: the first end 101 of the mixing pipe body 1 is arranged with the first air inlet 11 and the second air inlet 12, one of which is used to suck in fresh air, and the other of which is used to suck in EGR exhaust gas; the second end 102 of the mixing pipe body 1 is arranged with the air outlet 13; the fresh air and the EGR exhaust gas can be fully mixed during the flow process from the first end 101 to the second end 102; the distance L from the intersection point of the first axis 001 of the gas flow field of the first air inlet 11 and the second axis 002 of the gas flow field of the second air inlet 12 to the air outlet 13 is greater than or equal to 40mm; the mixing distance of the fresh air and the EGR exhaust gas is longer, which can ensure the uniform mixing of the fresh air and the EGR exhaust gas, thereby improving the EGR utilization rate of the engine system and reducing the emission of nitrogen oxides.

[0059] In some possible implementations, the distance L from the intersection point of the first axis 001 of the gas flow field of the first air inlet 11 and the second axis 002 of the gas flow field of the second air inlet 12 to the air outlet 13 is, for example, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, etc.

[0060] Exemplarily, the distance L from the intersection point of the first axis 001 of the gas flow field of the first air inlet 11 and the second axis 002 of the gas flow field of the second air inlet 12 to the air outlet 13 is 80mm, so that the mixing distance of the fresh air and the EGR exhaust gas is longer, which can ensure the sufficient and uniform mixing of the two kinds of gas, reduce the precipitation of condensed water, and prevent the damage of the condensed water to the blades in the turbocharger 30.

[0061] In combination with Figure 2 , 3As shown, in some embodiments, the extension line of the third axis 003 of the mixing pipe body 1 intersects the first air inlet 11, and the first air inlet 11 is provided with a first connecting flange 14 for connecting the back pressure valve assembly 2.

[0062] In the embodiment, the third axis 003 of the mixing pipe body 1 intersects the first air inlet 11, or it can be described that at least part of the first air inlet 11 is located on the axial end surface of the first end portion 101 of the mixing pipe body 1. The third axis 003 intersects the first air inlet 11, which can be perpendicular intersection or non-perpendicular intersection. The deviation angle of the flow field direction of the gas sucked by the first air inlet 11 and the third axis 003 of the mixing pipe body 1 is small, the flow resistance of the gas is small, and the gas flow efficiency in the mixing pipe body 1 is improved.

[0063] The back pressure valve assembly 2 is arranged on the flow path of fresh air, which can improve and adjust the pressure of the fresh air entering the mixing pipe body 1 by using the back pressure effect of the back pressure valve, thereby improving the working efficiency of the engine.

[0064] In some possible implementations, in the working state of the EGR mixing structure 10, the first air inlet 11 is inclined upward, that is, part of the first air inlet 11 is located on the axial end surface of the first end portion 101 of the mixing pipe body 1, and another part of the first air inlet 11 is located on the side surface of the first end portion 101 of the mixing pipe body 1 facing upward or upward. The orientation of the first air inlet 11 can be compatible with the assembly space of the back pressure valve assembly 2 and the turbocharger 30.

[0065] In combination with Figure 2 As shown, in some embodiments, the back pressure valve assembly 2 includes a back pressure valve body 21 and a bracket 22, and the back pressure valve body 21 is connected with the bracket 22.

[0066] The bracket 22 is provided with a first connecting portion and a second connecting portion; the first connecting portion is connected with the first connecting flange 14, and is used for fixing the relative position of the back pressure valve body 21 and the first air inlet 11 and connecting them; and the second connecting portion is connected with the engine cylinder head, and is used for supporting the back pressure valve assembly 2.

[0067] The back pressure valve body is heavy, about 600g, so it needs to be supported and fixed.

[0068] In the related art, the back pressure valve and the turbocharger 30 are rigidly connected through a tee structure, and the back pressure valve is also rigidly connected with the engine cylinder head, so that the turbocharger 30, the cylinder head and the back pressure valve form a closed loop rigid connection. During the operation of the engine, the local structure of the turbocharger 30 will expand and contract due to heat. However, because the turbocharger 30 is rigidly connected through the back pressure valve and two parts of the turbocharger 30, the components of the turbocharger 30 will be subjected to tensile stress, which may cause the turbocharger 30 to fail.

[0069] The back pressure valve body 21 of the embodiment is supported and fixed on the cylinder head of the engine by the bracket 22, and is not rigidly connected with the turbocharger 30, so that the structure of the turbocharger 30 is not affected, and the working reliability of the turbocharger 30 is ensured.

[0070] In some possible implementations, the first connecting part corresponds to the structure of the first connecting flange 14, the first connecting part is a flange, and the first connecting part and the first connecting flange 14 are stably and reliably connected together by fastening elements such as bolts and screws, so that the outlet of the back pressure valve body 21 is aligned and communicated with the first air inlet 11, and the fresh air output by the back pressure valve body 21 enters the mixing pipe body 1 through the first air inlet 11.

[0071] In other possible implementations, the back pressure valve body 21 further includes a back pressure valve air inlet 211, which is used to connect an air filter. External air enters the back pressure valve air inlet 211 after being filtered by the air filter, and enters the mixing pipe body 1 after being regulated by the back pressure valve body 21.

[0072] In combination Figure 3 As shown in FIG. 1, in some embodiments, the first connecting flange 14 includes at least three fastening connecting parts, which are arranged around the first air inlet 11 in a circumferential direction.

[0073] The fastening connecting part can be used to stably and reliably connect the first connecting part of the bracket 22 to the first air inlet 11 of the EGR mixing structure 10.

[0074] In some possible implementations, the fastening connecting parts are uniformly and circumferentially arranged around the first air inlet 11, so as to provide a circumferentially uniform fastening force for the first connecting flange 14 and the first connecting part.

[0075] Optionally, the number of fastening connecting parts is, for example, three, four, five or the like.

[0076] In combination Figure 3As shown, in some embodiments, the second air inlet 12 is located at the side of the first end 101 of the mixing pipe body 1, and the second axis 002 of the gas flow field of the second air inlet 12 intersects with the third axis 003 of the mixing pipe body 1.

[0077] The EGR mixing structure 10 of the embodiment arranges the second air inlet 12 for inhaling EGR exhaust gas at the side of the first end 101 of the mixing pipe body 1, and the second axis 002 of the gas flow field of the second air inlet 12 intersects with the third axis 003 of the mixing pipe body 1, and the EGR exhaust gas flows in the direction of the third axis 003 of the mixing pipe body 1 after entering, which is beneficial to improve the uniform distribution of the EGR exhaust gas in the mixing pipe body 1, and improve the mixing efficiency and mixing effect of the EGR exhaust gas and fresh air.

[0078] In combination Figure 3 As shown, in some embodiments, the first axis 001 of the gas flow field of the first air inlet 11, the second axis 002 of the gas flow field of the second air inlet 12, and the third axis 003 of the mixing pipe body 1 all intersect at one point.

[0079] In the EGR mixing structure 10 of the embodiment, the first axis 001 of the gas flow field of the first air inlet 11 for inhaling fresh air, the second axis 002 of the gas flow field of the second air inlet 12 for inhaling EGR exhaust gas, and the third axis 003 of the mixing pipe body 1 all intersect at one point, and the fresh air and the EGR exhaust gas enter and meet at the same point and collide with each other, which helps to break the gas laminar flow in the mixing pipe, which is beneficial to improve the uniform distribution of the fresh air and the EGR exhaust gas in the mixing pipe body 1, and improve the mixing efficiency and mixing effect of the EGR exhaust gas and the fresh air.

[0080] In combination Figure 2 , 3 As shown, in some embodiments, the first air inlet 11 is used to inhale fresh air, and the second air inlet 12 is used to inhale EGR exhaust gas; in the working state of the EGR mixing structure 10, the second air inlet 12 is located at the top surface in the vertical direction or the side surface in the horizontal direction of the first end 101 of the mixing pipe body 1.

[0081] Because the gas temperature of the EGR exhaust gas is usually high, condensation occurs when it meets fresh air, and condensate water is separated out, which mixes with oil in the EGR exhaust gas to form an oil-water mixture. The oil-water mixture in the pipeline exists at the lowest point of the channel under the action of gravity, and if the air inlet of the EGR gas is at the lowest point of the channel, the oil-water mixture will enter the air inlet from the air inlet, and when the valve on the air inlet is in a closed state, the oil-water mixture will accumulate at the valve plate, which will corrode the valve plate on the one hand, and on the other hand, it may also stick to the valve plate, causing the valve plate to be stuck.

[0082] Therefore, the EGR mixing structure 10 of the embodiment arranges the second intake port 12 for sucking in the EGR exhaust gas at the top surface of the mixing pipe body 1 or the side surface in the horizontal direction, so that the oil-water mixture, carbon deposition and other substances in the mixing pipe body 1 cannot enter the intake pipe under the action of gravity.

[0083] Optionally, the second intake port 12 is located at the top surface of the first end portion 101 of the mixing pipe body 1 in the vertical direction, or the second intake port 12 is located at the side surface of the first end portion 101 of the mixing pipe body 1 in the vertical direction.

[0084] In combination Figure 3 As shown in some embodiments, the second intake port 12 is used for sucking in the EGR exhaust gas, and the second intake port 12 has an included angle A between the second axis 002 of the gas flow field of the second intake port 12 and the third axis 003 of the mixing pipe body 1, where A≥80°.

[0085] The second intake port 12 of the embodiment is used for sucking in the EGR exhaust gas, and the EGR exhaust gas suction port flows along the second axis 002 of the gas flow field of the second intake port 12, and the included angle A between the flowing direction and the third axis 003 of the mixing pipe body 1 is≥80°, so that the EGR exhaust gas is not easy to form a laminar flow in the mixing pipe body 1, and the EGR exhaust gas will be distributed in a turbulent flow under the impact of fresh air, which is beneficial to improve the mixing effect of the EGR exhaust gas and the fresh air, and is beneficial to improve the EGR utilization rate of the engine.

[0086] In combination Figure 5 As shown in some embodiments, the EGR mixing structure 10 further comprises an EGR valve 3, the EGR valve 3 is in communication with the first intake port 11 or the second intake port 12, and the EGR valve 3 is used to control the flow of the EGR exhaust gas.

[0087] Exemplarily, the EGR valve 3 is used to control the amount of exhaust gas recirculation fed into the intake system, which controls the amount of EGR exhaust gas entering the intake manifold, so that a certain amount of EGR exhaust gas flows into the intake manifold for recirculation. When the EGR system stops working, the EGR valve 3 is in a closed state.

[0088] In some possible implementations, the second intake port 12 is provided with a second connecting flange 15, and the second connecting flange 15 is used to connect an intake hose 5 for conveying the EGR exhaust gas. One end of the intake hose 5 is communicated with the second intake port 12, and the other end is communicated with a curved pipe 20. The EGR valve 3 is located on the intake hose 5, and the EGR exhaust gas in the curved pipe 20 can enter the mixing pipe body 1 through the intake hose 5, and the EGR valve 3 controls the flow of the EGR exhaust gas.

[0089] The crankcase ventilation pipe or the crankcase ventilation pipe, its function includes but is not limited to: prevent lubricating oil deterioration and prevent fuel dilution oil, reduce the wear and corrosion of machine parts;Pressure reduction, cooling, leakage prevention;Recovery of combustible gas, reduce pollution.The gas that strayed into the crankcase is inhaled into the cylinder again to burn, CH compound recycling, while also reducing air pollution.

[0090] In combination Figures 2-4 As shown in some embodiments, the EGR mixing structure 10 also includes a quick connector assembly 4, which is located at the gas outlet 13 and is connected to the inlet of the turbocharger 30 by the quick connector assembly 4.

[0091] The quick connector assembly 4 includes a connector body 41, an elastic clamping member 42 and a sealing ring 43, which are respectively located on the inner wall of the connector body 41, the elastic clamping member 42 is used for clamping in the mounting groove of the mating connector, and the sealing ring 43 is used for sealing connection between the connector body 41 and the mating connector.

[0092] In the EGR mixing structure 10 of the embodiment, the mixing pipe body 1 is rigidly connected with the back pressure valve assembly 2, and the second end 102 of the mixing pipe body 1 is connected with the turbocharger 30. In order to avoid the stress burden of the mixing pipe body 1 on the turbocharger 30, the quick connector assembly 4 is used to connect the turbocharger 30, and the flexible connection characteristics of the quick connector assembly 4 are used to buffer the rigid impact between the mixing pipe body 1 and the turbocharger 30 or compensate for the relative movement between them.

[0093] The elastic clamping member 42 on the inner wall of the connector body 41 is clamped with the mounting groove of the mating connector on the side of the turbocharger 30, the flexible sealing ring 43 realizes flexible sealing connection between the connector body 41 and the mating connector, and the flexibility of the sealing ring 43 is used. The quick connector assembly 4 has a certain degree of freedom in the radial and axial directions, which can be used to eliminate the stress between the connector body 41 and the mating connector, thereby eliminating the stress between the mixing pipe body 1 and the turbocharger 30.

[0094] In some possible implementations, the turbocharger 30 includes a pressure shell, an intermediate body and a volute, and the connection between the intermediate body and the pressure shell and the volute has a certain degree of freedom. The above-mentioned mating connector is located on the pressure shell, so that the pressure shell and the mixing pipe body 1 are flexibly connected, the EGR mixing structure 10 and the back pressure valve assembly 2 do not cause stress to the pressure shell, and do not hinder the thermal expansion and contraction of the turbocharger 30 itself, thereby facilitating the avoidance of stress pulling between the pressure shell and the volute of the turbocharger 30, and preventing damage and failure of the turbocharger 30.

[0095] On the other hand, in combination Figures 2-5As shown, the engine system of the present embodiment comprises the EGR mixing structure 10, the bypass pipe 20 and the turbocharger 30 of the present application; the bypass pipe 20 is in communication with the first intake port 11 or the second intake port 12, and the bypass pipe 20 is configured to supply the EGR exhaust gas to the first intake port 11 or the second intake port 12; the turbocharger 30 is in communication with the outlet 13, and the turbocharger 30 is configured to compress the mixed fresh air and EGR exhaust gas.

[0096] The engine system of the present embodiment adopts the EGR mixing structure 10 of the present application, and has all the beneficial technical effects of all the embodiments herein.

[0097] In another aspect, the present embodiment provides a vehicle, which comprises the EGR mixing structure 10 of the present application, or the engine system of the present application.

[0098] The vehicle of the present embodiment adopts the EGR mixing structure 10 of the present application or the engine system of the present application, and has all the beneficial technical effects of all the embodiments herein.

[0099] It should be noted that, in the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0100] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0101] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0102] In the description of the present specification, the description of the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example" or "some examples" means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the present application.

[0103] The above only describes the embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. An EGR mixing structure, characterized by, The EGR mixing structure (10) comprises a mixing pipe body (1); The mixing pipe body (1) is provided with a first air inlet (11), a second air inlet (12) and an air outlet (13); The first air inlet (11) is used for inhaling fresh air, the second air inlet (12) is used for inhaling EGR exhaust gas, and the air outlet (13) is used for discharging mixed fresh air and EGR exhaust gas; The first air inlet (11) and the second air inlet (12) are located at the axial first end (101) of the mixing pipe body (1), and the air outlet (13) is located at the axial second end (102) of the mixing pipe body (1); The first axis (001) of the gas flow field of the first air inlet (11) and the second axis (002) of the gas flow field of the second air inlet (12) intersect, and the distance from the intersection point to the air outlet (13) is L, wherein L≥40mm; Part of the first air inlet (11) is located on the axial end face of the first end (101), and the other part of the first air inlet (11) is located on the side face of the first end (101) facing upward or obliquely upward; The first axis (001), the second axis (002) and the third axis (003) of the mixing pipe body (1) intersect at a point; The second axis (002) and the third axis (003) have an included angle A between the extension lines outward of the first end (101), wherein A=80°.

2. The EGR mixing structure of claim 1, wherein The extension line of the third axis (003) of the mixing pipe body (1) intersects the first air inlet (11), and the first air inlet (11) is provided with a first connecting flange (14) for connecting a back pressure valve assembly (2).

3. The EGR mixing structure of claim 2, wherein, The back pressure valve assembly (2) comprises a back pressure valve body (21) and a bracket (22), and the back pressure valve body (21) is connected with the bracket (22); The bracket (22) is provided with a first connecting part and a second connecting part; The first connecting part is connected with the first connecting flange (14) to fix the relative position of the back pressure valve body (21) and the first air inlet (11) and to communicate with each other; The second connecting part is connected with the engine cylinder head to support the back pressure valve assembly (2).

4. The EGR mixing structure of claim 2, wherein The first air inlet (11) is used for inhaling fresh air, and the second air inlet (12) is used for inhaling EGR exhaust gas; In the working state of the EGR mixing structure (10), the second air inlet (12) is located on the top surface in the vertical direction or on the side surface in the horizontal direction of the first end (101) of the mixing pipe body (1).

5. The EGR mixing structure of claim 1, wherein The EGR mixing structure (10) further comprises an EGR valve (3) which communicates with the first air inlet (11) or the second air inlet (12), and the EGR valve (3) is used for controlling the flow of EGR exhaust gas.

6. The EGR mixing structure of any one of claims 1 to 5, wherein, The EGR mixing structure (10) further comprises a quick connector assembly (4) located at the gas outlet (13), the gas outlet (13) being connected with an air inlet of a turbocharger (30) by the quick connector assembly (4); The quick connector assembly (4) comprises a connector body (41), an elastic clamping piece (42) and a sealing ring (43), the elastic clamping piece (42) and the sealing ring (43) are respectively located on the inner wall of the connector body (41), the elastic clamping piece (42) is used for clamping in a mounting groove of a mating connector, and the sealing ring (43) is used for realizing sealed connection of the connector body (41) and the mating connector.

7. An engine system characterized by, The engine system comprises the EGR mixing structure (10) according to any one of claims 1 to 6, an exhaust pipe (20) and a turbocharger (30); The exhaust pipe (20) is communicated with the first air inlet (11) or the second air inlet (12), and the exhaust pipe (20) is used for supplying EGR exhaust gas to the first air inlet (11) or the second air inlet (12); The turbocharger (30) is communicated with the gas outlet (13), and the turbocharger (30) is used for compressing the mixed fresh air and EGR exhaust gas.

8. A vehicle characterized by comprising: The vehicle comprises the EGR mixing structure (10) according to any one of claims 1 to 6 or the engine system according to claim 7.

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