Exhaust gas recirculation mixing assembly and vehicle

Abstract

The invention provides an exhaust gas recirculation mixing assembly and a vehicle, and the exhaust gas recirculation mixing assembly comprises a gas inlet pipe provided with an exhaust gas channel; the mixing pipe is connected with the gas inlet pipe, the mixing pipe is provided with a waste gas inlet channel and a mixing channel which are communicated with each other, the waste gas inlet channel is provided with a gas inlet end and a gas outlet end, the gas inlet end is communicated with the gas inlet pipe, the gas outlet end is communicated with the mixing channel, and in the axial direction of the gas inlet pipe, the mixing channel is communicated with the gas inlet pipe. The air outlet end is farther away from the air inlet pipe than the air inlet end; the air outlet pipe is connected with the mixing pipe, and the air outlet pipe is provided with an air outlet channel communicated with the mixing channel. Through the arrangement, liquid such as condensed water or an oil-water mixture is difficult to enter the higher gas outlet end, and is difficult to enter the waste gas inlet channel through the gas outlet end to reach the gas inlet pipe and the EGR valve, so that the corrosion of the condensed liquid or the oil-water mixture to the EGR valve is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a waste gas recirculation mixing assembly and a vehicle. BACKGROUND

[0002] With the continuous tightening of fuel consumption indicators, the EGR (Exhaust Gas Recirculation) system 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 that the intake pipe is directly connected below the mixing pipe, and the exhaust gas in the intake pipe and the fresh air of the mixing pipe are directly mixed. This scheme will cause the exhaust gas and fresh air to be mixed unevenly, and condensate water is easy to separate out, and the oil-water mixture produced will invade the EGR valve, which will cause the EGR valve to be stuck or damaged, affecting the operation of the engine and the vehicle. SUMMARY

[0004] In view of this, the present application provides a waste gas recirculation mixing assembly and a vehicle, which can solve the problem that condensate liquid easily invades the EGR valve and causes the EGR valve to be stuck or damaged.

[0005] Specifically, the technical scheme includes the following: In a first aspect, the present application provides a waste gas recirculation mixing assembly, which comprises: an intake pipe provided with an exhaust gas passage; a mixing pipe connected with the intake pipe, the mixing pipe being provided with an exhaust gas intake passage and a mixing passage that are in communication with each other, the exhaust gas intake passage having an intake end and an exhaust end, the intake end being in communication with the intake pipe, the exhaust end being in communication with the mixing passage, and in the axial direction of the intake pipe, the exhaust end is farther away from the intake pipe than the intake end; an exhaust pipe connected with the mixing pipe, the exhaust pipe being provided with an exhaust passage in communication with the mixing passage.

[0006] In the technical solution of the application, since the mixing pipe is provided with the exhaust gas inlet channel, and the outlet end of the exhaust gas inlet channel is farther away from the inlet end than the inlet end is from the inlet pipe, in the axial direction of the inlet pipe, the height of the outlet end of the exhaust gas inlet channel is greater than the height of the inlet end, and the height of the outlet end of the exhaust gas inlet channel is also greater than the height of the inlet pipe, so that the condensed water or oil-water mixture and other liquids in the mixing channel are difficult to enter the outlet end with a higher height, and then are difficult to enter the exhaust gas inlet channel through the outlet end to reach the inlet pipe and the EGR valve, effectively avoiding corrosion of the condensed liquid or oil-water mixture on the EGR valve, preventing the EGR valve from being stuck or damaged, improving the reliability of the exhaust gas recirculation assembly, and being beneficial to enhancing the stability of the engine and the vehicle.

[0007] In a possible implementation, the axial direction of the inlet pipe and the axial direction of the outlet pipe have an included angle.

[0008] In the technical solution of the application, by setting the axial direction of the inlet pipe and the axial direction of the outlet pipe to have an included angle, the direction of the airflow is changed in the mixing pipe, so that vortex or turbulent flow is generated, the EGR exhaust gas is fully mixed with fresh air, and the uniformity of the mixed gas is improved; in addition, the included angle between the axial direction of the inlet pipe and the axial direction of the outlet pipe enhances the spatial applicability of the exhaust gas recirculation mixing assembly, and is beneficial to flexible arrangement in the vehicle.

[0009] In a possible implementation, the exhaust gas inlet channel extends at least partially in an arc shape, and the end of the mixing channel is coaxially arranged with the outlet pipe.

[0010] In the technical solution of the application, by setting the exhaust gas inlet channel to extend at least partially in an arc shape, the arc shape design makes the airflow smoothly turn, reduces pressure loss and energy consumption; and the shape of the arc-shaped exhaust gas inlet channel is adapted to the shape of the mixing pipe, which is beneficial to reducing the production and manufacturing difficulty of the mixing pipe; by coaxially arranging the end of the mixing channel with the outlet pipe, the shape of the mixing channel is adapted to the shape of the outlet channel, which is beneficial to quickly discharging the mixed gas to the outlet channel.

[0011] In a possible implementation, a first flow guide part is arranged at the outlet end of the mixing pipe, the first flow guide part is in communication with the exhaust gas inlet channel and the mixing channel respectively, and the two side walls of the first flow guide part which are oppositely arranged along the axial direction of the outlet pipe are inclined to each other with respect to the axial direction of the outlet pipe, so that the outlet direction of the outlet end is obliquely arranged with respect to the axial direction of the outlet pipe.

[0012] In the technical solution of the present application, the flow direction of fresh air and the flow direction of EGR exhaust gas are obliquely arranged, which is beneficial to improve the mixing uniformity of EGR exhaust gas and fresh air, maximally reduce the possibility of large-particle condensed liquid generated when fresh air and EGR exhaust gas are not uniformly mixed, and thus is beneficial to reduce the adverse effect on the reliability of the supercharger.

[0013] In a possible implementation, the included angle between the air outlet direction of the air outlet end and the axial direction of the air outlet pipe is 80°.

[0014] In the technical solution of the present application, the included angle between the air outlet direction of the air outlet end and the axial direction of the air outlet pipe is close to perpendicular but not 90°, which avoids excessive turbulence generated due to the air outlet direction of the air outlet end being perpendicular to the axial direction of the air outlet pipe, resulting in energy loss, and simultaneously avoids the difficulty of EGR exhaust gas and fresh air being fully mixed due to the included angle between the air outlet direction of the air outlet end and the axial direction of the air outlet pipe being too small.

[0015] In a possible implementation, the mixing pipe comprises a first pipe body and a second pipe body, the first pipe body is connected with the air inlet pipe, the second pipe body is connected with the air outlet pipe, and the first pipe body and the second pipe body are detachably connected.

[0016] In the technical solution of the present application, the first pipe body and the second pipe body are detachably connected, which facilitates the maintenance and cleaning of the exhaust gas recirculation mixing assembly, allows the carbon deposition or condensate to be periodically removed, prolongs the service life of the exhaust gas recirculation mixing assembly, simultaneously improves the modular degree of the exhaust gas recirculation mixing assembly, simplifies the manufacturing and assembly steps, and is beneficial to reduce the maintenance cost.

[0017] In a possible implementation, the exhaust gas recirculation mixing assembly further comprises a curve-through pipe, and the curve-through pipe is in communication with the mixing pipe.

[0018] In the technical solution of the present application, the curve-through pipe and the mixing pipe are integrated, the crankcase ventilation gas (containing oil-water mixture) is introduced into the mixing pipe for processing together with the exhaust gas, the structure of the exhaust gas recirculation mixing assembly is more compact, the space occupied by the curve-through pipe separated from the mixing pipe is reduced, and the space utilization of the vehicle is improved.

[0019] In a possible implementation, the mixing pipe further comprises a second flow guide part, the second flow guide part is arranged in the mixing pipe and located at the connection between the curve-through pipe and the mixing pipe, one side surface of the second flow guide part close to the curve-through pipe is a flow guide surface, the flow guide surface is in a curved surface shape, and the extension plane of the end of the flow guide surface has an included angle with the axial direction of the curve-through pipe.

[0020] In the technical solution of the present application, the curved flow guide surface is smooth in shape, can smoothly guide the gas in the curved pipe into the mixing pipe, and improve the mixing condition of the gas in the curved pipe and the gas in the relaxation pipe. Meanwhile, the angle between the extension plane of the end of the flow guide surface and the axial direction of the curved pipe can control the direction of the gas flow, reduce the impact of the gas flow, and reduce the risk of condensation.

[0021] In a possible implementation, the second flow guide part includes a first baffle and a second baffle, which are respectively arranged on opposite sides of the connection between the curved pipe and the mixing pipe. The distance between the first baffle and the second baffle gradually decreases from one end connected to the inner wall of the mixing pipe to the other end away from the inner wall of the mixing pipe.

[0022] In the technical solution of the present application, the first baffle and the second baffle are arranged oppositely and form a convergent channel for the gas flow, which is beneficial to improve the flow speed of the gas, improve the flow and mixing efficiency of the gas, and reduce energy loss.

[0023] In a second aspect, a vehicle is provided, and the vehicle includes the exhaust gas recirculation mixing assembly provided in any one of the embodiments of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present 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 present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 An exploded view of the exhaust gas recirculation mixing assembly provided in the embodiments of the present application; Figure 2 A perspective view of the exhaust gas recirculation mixing assembly provided in the embodiments of the present application; Figure 3 A structural schematic view of the intake pipe provided in the embodiments of the present application; Figure 4 A structural schematic view of the exhaust pipe provided in the embodiments of the present application; Figure 5 A sectional view of the exhaust gas recirculation mixing assembly provided in the embodiments of the present application; Figure 6 A structural schematic view of the second pipe body provided in the embodiments of the present application; Figure 7 A structural schematic view of the first pipe body provided in the embodiments of the present application; Figure 8 A structural schematic view of the mixing pipe provided in the embodiments of the present application; Figure 9One of the cross-sectional views of the mixing pipe provided by the embodiment of the present application; Figure 10 One of the cross-sectional views of the mixing pipe provided by the embodiment of the present application;

[0026] The reference signs in the drawings represent the following: 1 - intake pipe; 11 - exhaust passage; 2 - mixing pipe; 21 - exhaust intake passage; 211 - intake end; 212 - exhaust end; 22 - mixing passage; 221 - intake port; 23 - first flow guide part; 24 - first pipe body; 25 - second pipe body; 26 - second flow guide part; 261 - flow guide surface; 262 - first baffle; 263 - second baffle; 3 - exhaust pipe; 31 - exhaust passage; 4 - curved passage pipe; 5 - single-ear endless clamp; 6 - pre-tensioned elastic clamp; 7 - worm clamp.

[0027] The specific embodiments of the present application have been shown in the above drawings, and will be described in more detail hereinafter. These drawings and the written description are not intended to limit the scope of the present application concept in any way, but to illustrate the present application concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative work are within the scope of protection of the present application.

[0029] The positional nouns such as "upper", "lower", "lateral" and the like involved in the embodiments of the present application are generally based on the relative relationship of the positions shown in the drawings, and these positional nouns are used only to more clearly describe the structures and the relationship between the structures, and are not intended to describe absolute positions. When the product is placed in different attitudes, the positions may change, for example, "upper" and "lower" may be interchanged.

[0030] Unless otherwise defined, all the technical terms used in the embodiments of the present application have the same meanings as generally understood by those skilled in the art.

[0031] In order to make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below in combination with the drawings.

[0032] EGR is the abbreviation of Exhaust Gas Recirculation, which 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 the fresh mixture is entered into the cylinder again. Since the exhaust gas contains a large amount of carbon dioxide and other multi-atom 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 gas mixture in the cylinder is reduced, thereby reducing the generation amount of nitrogen oxides.

[0033] 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 amount, 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.

[0034] In the related art, the commonly used EGR mixing scheme is that the intake pipe is directly connected to the lower side of the mixing pipe, and the exhaust gas in the intake pipe and the fresh air in the mixing pipe are directly mixed to produce condensation. Since the intake port of the mixing pipe is relatively low, the condensed liquid can easily enter the EGR valve below the intake pipe. At the same time, the oil-water mixture of the crankshaft system and the carbon deposition in the exhaust gas of the EGR system will adhere to the valve plate and the passage of the EGR valve. In addition, there are elements such as chlorine and sulfur in the condensed liquid after gasoline combustion, which further produce acidic substances, corrode the passages, valve plates, valve shafts and other parts of the EGR valve, and the corrosion and the crankshaft mixture can cause the EGR valve to be stuck and other problems, and eventually cause the engine to alarm and affect the operation of the vehicle.

[0035] In view of the above technical problems, the exhaust gas recirculation mixing assembly and the vehicle provided by the present application can solve the problem that condensed water easily invades the EGR valve and causes the EGR valve to be stuck or damaged.

[0036] As shown in Figure 1 and Figure 2 , the exhaust gas recirculation mixing assembly comprises an intake pipe 1, a mixing pipe 2 and an exhaust pipe 3.

[0037] As shown in Figure 3 , the intake pipe 1 is provided with an exhaust gas passage 11.

[0038] As shown in Figure 5As shown, the mixing pipe 2 is connected to the intake pipe 1. The mixing pipe 2 is provided with an exhaust gas intake channel 21 and a mixing channel 22 that are interconnected. The exhaust gas intake channel 21 has an intake end 211 and an outlet end 212. The intake end 211 is connected to the intake pipe 1, and the outlet end 212 is connected to the mixing channel 22. Furthermore, in the axial direction of the intake pipe 1, the outlet end 212 is farther away from the intake pipe 1 than the intake end 211.

[0039] The exhaust pipe 3 is connected to the mixing pipe 2, such as Figure 4 As shown, the air outlet pipe 3 is provided with an air outlet channel 31 that is connected to the mixing channel 22.

[0040] Both the intake pipe 1 and the outlet pipe 3 are cylindrical. One end of the intake pipe 1 is connected to the EGR valve, and the other end is connected to the mixing pipe 2. The intake pipe 1 is used to draw in EGR exhaust gas.

[0041] like Figure 6 As shown, the mixing channel 22 of the mixing pipe 2 is provided with an air inlet 221. The air inlet 221 is used to draw in fresh air. After the fresh air and EGR exhaust gas are mixed in the mixing channel 22, they enter the exhaust channel 31 of the exhaust pipe 3.

[0042] For example, one end of the exhaust pipe 3 is connected to the mixing pipe 2, and the other end is connected to the turbocharger. The mixed EGR exhaust gas and fresh air are discharged from the exhaust passage 31 to the turbocharger.

[0043] Since the outlet end 212 is farther away from the intake end 211 than the intake end 211 in the axial direction of the intake pipe 1, when the intake pipe 1 is located below the mixing pipe 2, the intake end 211 of the exhaust gas intake passage 21 is located below the outlet end 212, and the outlet end 212 is higher than the intake end 211. In this way, even if the EGR exhaust gas mixes with fresh air in the mixing passage 22 to produce condensate, the condensate is unlikely to enter the higher outlet end 212, and even less likely to enter the exhaust gas intake passage 21 through the outlet end 212 and flow into the intake pipe 1 and the EGR valve. This effectively avoids the condensate from corroding the EGR valve, reduces the negative impact of other systems (such as the bypass system) on the EGR system, and also reduces the negative impact of the EGR system on the turbocharging system.

[0044] Furthermore, the integrated design of the inlet pipe 1, mixing pipe 2, and outlet pipe 3 of the exhaust gas recirculation mixing component helps to reduce the overall size, improve the structural compactness of the exhaust gas recirculation mixing component, and at the same time reduce the number of parts and save assembly time.

[0045] Specifically, EGR exhaust gas enters the exhaust gas passage 11 of intake pipe 1 through EGR valve, then enters exhaust gas intake passage 21 through intake end 211 of exhaust gas intake passage 21, and exits exhaust gas intake passage 21 from exhaust end 212 of exhaust gas intake passage 21, entering mixing passage 22; fresh air enters mixing passage 22 from intake port 221 of mixing passage 22, mixes with EGR exhaust gas in mixing passage 22, and then enters exhaust passage 31 of exhaust pipe 3 from mixing passage 22, and then enters turbocharger from exhaust passage 31.

[0046] The number of air outlets 212 can be one or more. This embodiment of the application uses one air outlet 212 as an example for illustration.

[0047] Optionally, such as Figure 2 As shown, the intake pipe 1 and the mixing pipe 2 are connected by a single-ear infinite clamp 5, and a pre-tensioned elastic clamp 6 is integrated to reduce the length of the exhaust pipe 3 and the mixing pipe 2 while ensuring a flexible connection.

[0048] Optionally, such as Figure 2 As shown, the exhaust pipe 3 and the mixing pipe 2 are connected by a single-ear stepless clamp 5 and an integrated worm gear clamp 7.

[0049] The exhaust gas recirculation mixing assembly provided in this embodiment has an exhaust gas intake channel 21 in the mixing pipe 2. The outlet end 212 of the exhaust gas intake channel 21 is farther away from the intake pipe 1 than the intake end 211. Therefore, in the axial direction of the intake pipe 1, with the intake pipe 1 as the height reference, the height of the outlet end 212 of the exhaust gas intake channel 21 is greater than the height of the intake end 211. At the same time, the height of the outlet end 212 of the exhaust gas intake channel 21 is also greater than the height of the intake pipe 1. Therefore, liquids such as condensate or oil-water mixture in the mixing channel 22 are difficult to enter the higher outlet end 212, and thus difficult to enter the exhaust gas intake channel 21 through the outlet end 212 to reach the intake pipe 1 and the EGR valve. This effectively avoids corrosion of the EGR valve by condensate or oil-water mixture, prevents the EGR valve from jamming or being damaged, improves the reliability of the exhaust gas recirculation assembly, and helps to enhance the stability of the engine and the whole vehicle.

[0050] In some embodiments, the axial direction of the intake pipe 1 is at an angle to the axial direction of the exhaust pipe 3.

[0051] Optionally, the angle between the axial direction of the intake pipe 1 and the axial direction of the exhaust pipe 3 can be an acute angle, a right angle, or an obtuse angle, which can be set according to the engine layout and airflow mixing requirements.

[0052] For example, the angle between the axial direction of the intake pipe 1 and the axial direction of the exhaust pipe 3 is 90°.

[0053] In this embodiment, the axial direction of the intake pipe 1 and the axial direction of the exhaust pipe 3 are designed to have an included angle, so that the airflow direction changes in the mixing pipe 2, thereby generating vortex or turbulence, promoting the mixing of EGR exhaust gas and fresh air, and improving the mixing uniformity of the gas; in addition, the included angle between the axial direction of the intake pipe 1 and the axial direction of the exhaust pipe 3 enhances the spatial applicability of the exhaust gas recirculation mixing assembly, which is beneficial to flexible arrangement in the vehicle.

[0054] In some embodiments, as shown in Figure 5 the exhaust gas inlet channel 21 is designed to extend at least partially in an arc shape, and the end of the mixing channel 22 is coaxially arranged with the exhaust pipe 3. It can be understood that the end of the mixing channel 22 is the end of the mixing pipe 2 for connecting with the exhaust pipe 3.

[0055] The center of the exhaust gas inlet channel 21 can be located on the straight line where the central axis of the exhaust pipe 3 is located, or can be located outside the straight line where the central axis of the exhaust pipe 3 is located.

[0056] In this embodiment, by designing the exhaust gas inlet channel 21 to extend at least partially in an arc shape, the arc design makes the airflow smoothly turn, reduces the pressure loss and energy consumption; and the shape of the arc-shaped exhaust gas inlet channel 21 is adapted to the shape of the circular pipe of the mixing pipe 2, which is beneficial to reduce the production and manufacturing difficulty of the mixing pipe 2; by coaxially arranging the end of the mixing channel 22 with the exhaust pipe 3, the shape of the mixing channel 22 is adapted to the shape of the exhaust channel 31, which is beneficial to quickly discharge the mixed gas to the exhaust channel 31.

[0057] Optionally, the exhaust gas inlet channel 21 is designed as a tapered pipe, that is, the cross-sectional area of the exhaust gas inlet channel 21 gradually decreases from the end close to the intake pipe 1 to the end close to the mixing channel 22. Through this design, it is beneficial to accelerate the airflow velocity and improve the gas mixing efficiency.

[0058] In some embodiments, as shown in Figure 8 the exhaust gas inlet channel 21 is designed to extend at least partially in an arc shape, and the end of the mixing channel 22 is coaxially arranged with the exhaust pipe 3. It can be understood that the end of the mixing channel 22 is the end of the mixing pipe 2 for connecting with the exhaust pipe 3.

[0059] The first flow guide part 23 protrudes relative to the outer wall of the mixing pipe 2, and the inside of the first flow guide part 23 is a hollow structure and is configured with a cavity for allowing airflow to flow.

[0060] As shown in Figure 8As shown, the straight line L1 is the axial direction of the outlet pipe 3, the straight line L2 is the outlet direction of the outlet end 212, and the included angle a between L1 and L2 is less than 90°.

[0061] Since the two side walls of the first flow guide part 23 are arranged opposite to each other along the axial direction of the outlet pipe 3 and are inclined to each other along the axial direction of the outlet pipe 3, and the first flow guide part 23 is located at the outlet end 212 of the mixing pipe 2, under the guidance of the two inclined side walls of the first flow guide part 23, the EGR exhaust gas in the exhaust gas inlet channel 21 flows into the mixing channel 22 along the inclined direction of the side wall, and mixes with the fresh air in the mixing channel 22, while the fresh air in the mixing channel 22 flows approximately along the axial direction of the outlet pipe 3, so that the flow direction of the fresh air is inclined to the flow direction of the EGR exhaust gas, which is conducive to improving the mixing uniformity of the EGR exhaust gas and the fresh air, and minimizing the possibility of large-particle condensed liquid generated when the fresh air and the EGR exhaust gas are not uniformly mixed, thereby facilitating the reduction of the adverse effects on the reliability of the supercharger.

[0062] In some embodiments, the included angle between the outlet direction of the outlet end 212 and the axial direction of the outlet pipe 3 is 80°, that is, Figure 8 The included angle a between L1 and L2 is 80°.

[0063] Through this arrangement, the included angle between the outlet direction of the outlet end 212 and the axial direction of the outlet pipe 3 is close to perpendicular but not 90°, avoiding excessive turbulence due to the outlet direction of the outlet end 212 being perpendicular to the axial direction of the outlet pipe 3, resulting in energy loss, while avoiding the difficulty of the EGR exhaust gas being fully mixed with the fresh air due to the included angle between the outlet direction of the outlet end 212 and the axial direction of the outlet pipe 3 being too small.

[0064] Optionally, the first flow guide part 23 is farther away from the outlet pipe 3 at the end closer to the inlet pipe 1 than at the end farther away from the inlet pipe 1, that is, in Figure 8 In this embodiment, the lower end of the first flow guide part 23 is farther away from the outlet pipe 3 in the axial direction of the outlet pipe 3 than the upper end, and the first flow guide part 23 is inclined upward to the right.

[0065] Through this arrangement, the EGR exhaust gas flow is guided to enter the mixing channel 22 at a more optimal angle, resulting in more sufficient turbulence or swirl with the fresh air, thereby improving the mixing efficiency; avoiding the EGR exhaust gas colliding with the fresh air due to being biased towards the inlet port 221 of the mixing channel 22, causing energy loss and affecting the inlet efficiency of the fresh air.

[0066] In some embodiments, as Figure 1 , Figure 6 and Figure 7As shown, the mixing pipe 2 includes a first pipe body 24 and a second pipe body 25, the first pipe body 24 is connected with the air inlet pipe 1, the second pipe body 25 is connected with the air outlet pipe 3, and the first pipe body 24 and the second pipe body 25 are detachably connected.

[0067] As shown, Figure 1 the first pipe body 24 and the second pipe body 25 are connected in opposition, the first pipe body 24 is located below the second pipe body 25, the first flow guide part 23 is arranged in the second pipe body 25, and the first pipe body 24 and the second pipe body 25 enclose to form the exhaust gas inlet passage 21, and the mixing passage 22 is located in the second pipe body 25.

[0068] Exemplarily, the first pipe body 24 and the second pipe body 25 can be detachably connected in the manner of flange connection, screw connection, buckle connection or quick connector, etc.

[0069] In this embodiment, by arranging the first pipe body 24 and the second pipe body 25 to be detachably connected, it is convenient to maintain and clean the exhaust gas recirculation mixing assembly, to allow regular removal of carbon deposition or condensate, thereby prolonging the service life of the exhaust gas recirculation mixing assembly; at the same time, the detachable connection improves the modular degree of the exhaust gas recirculation mixing assembly, simplifies the manufacturing and assembly steps, and is conducive to reducing maintenance costs.

[0070] In some embodiments, the exhaust gas recirculation mixing assembly further includes a curve pipe 4, which is in communication with the mixing pipe 2.

[0071] As shown, Figure 2 the curve pipe 4 is located at an end of the mixing pipe 2 opposite to the air inlet pipe 1.

[0072] The curve pipe 4, also known as the crankcase ventilation pipe, has functions including but not limited to: preventing deterioration of lubricating oil and preventing fuel dilution of engine oil, reducing wear and corrosion of machine parts; pressure reduction, temperature reduction, leakage prevention; recovery of combustible gas, reduction of pollution. The gas that has entered the crankcase is inhaled into the cylinder again for combustion, which recycles CH compounds and reduces air pollution.

[0073] In this embodiment, the curve pipe 4 is designed to be integrated with the mixing pipe 2, and the crankcase ventilation gas (containing oil-water mixture) is introduced into the mixing pipe 2 for treatment together with the exhaust gas, so that the structure of the exhaust gas recirculation mixing assembly is more compact, the space occupied by the curve pipe 4 separated from the mixing pipe 2 is reduced, and the space utilization of the vehicle is improved.

[0074] In some embodiments, as shown, Figure 9 and Figure 10As shown, the mixing pipe 2 further comprises a second flow guide part 26, which is arranged in the mixing pipe 2 and located at the connection between the curved pipe 4 and the mixing pipe 2. The side surface of the second flow guide part 26 close to the curved pipe 4 is a flow guide surface 261, which is curved and has an end extension plane that forms an angle with the axial direction of the curved pipe 4.

[0075] It can be understood that the end of the flow guide surface 261 is the end of the second flow guide part 26 in the downstream direction of the gas flow from the curved pipe 4 into the mixing pipe 2, for example, the end of the flow guide surface 261 is the right end of the flow guide surface 261. Figure 9

[0076] As shown, the second flow guide part 26 is connected with the inner wall of the mixing pipe 2 and located around the connection between the curved pipe 4 and the mixing pipe 2, and the second flow guide part 26 is used for guiding the gas flow from the curved pipe 4 into the mixing pipe 2. Figure 9

[0077] The curved flow guide surface 261 is smooth in shape, which can smoothly guide the gas in the curved pipe 4 into the mixing pipe 2, improve the mixing condition of the gas in the curved pipe 4 and the gas in the mixing pipe 2, and the angle between the end extension plane of the flow guide surface 261 and the axial direction of the curved pipe 4 can control the direction of the gas flow, reduce the impact of the gas flow, and reduce the risk of condensation.

[0078] In some embodiments, as shown, the second flow guide part 26 comprises a first baffle 262 and a second baffle 263, which are respectively arranged on the opposite sides of the connection between the curved pipe 4 and the mixing pipe 2, and the distance between the first baffle 262 and the second baffle 263 gradually decreases from the end connected with the inner wall of the mixing pipe 2 to the end away from the inner wall of the mixing pipe 2. Figure 10

[0079] Exemplarily, as shown, the angle between the extension plane of the first baffle 262 and the extension plane of the second baffle 263 is substantially 90°, the first baffle 262 and the second baffle 263 are oppositely arranged and form a converging channel for the gas flow, which is beneficial to improve the flow speed of the gas, improve the flow and mixing efficiency of the gas, and reduce the energy loss. Figure 10 The embodiments of the present application further provide a vehicle comprising the exhaust gas recirculation mixing assembly provided by any of the above embodiments.

[0080] The vehicle provided by the embodiments of the present application has the beneficial effects of the exhaust gas recirculation mixing assembly provided by any of the above embodiments, which will not be described here again.

[0081]

[0082] ​​​​In this application, the terms "first" and "second" are used only for descriptive purposes and not to connote or imply relative importance. The term "plurality" refers to two or more, unless otherwise expressly specified.

[0083] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope of the application being indicated by the following claims.

[0084] It is to be understood that the application is not limited to the precise structures herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is indicated by the appended claims, rather than by the description.

Claims

1. A waste gas recirculation mixing component, characterized in that, The exhaust gas recirculation mixing assembly includes: The intake pipe (1) is equipped with an exhaust gas passage (11). A mixing pipe (2) is connected to the air intake pipe (1). The mixing pipe (2) is provided with an exhaust gas intake channel (21) and a mixing channel (22) that are interconnected. The exhaust gas intake channel (21) has an intake end (211) and an outlet end (212). The intake end (211) is connected to the air intake pipe (1), and the outlet end (212) is connected to the mixing channel (22). In the axial direction of the air intake pipe (1), the outlet end (212) is farther away from the air intake pipe (1) than the intake end (211). An exhaust pipe (3) is connected to the mixing pipe (2), and the exhaust pipe (3) is provided with an exhaust channel (31) that communicates with the mixing channel (22).

2. The waste gas recirculation mixing assembly according to claim 1, characterized in that, The axial direction of the air inlet pipe (1) is at an angle to the axial direction of the air outlet pipe (3).

3. The waste gas recirculation mixing assembly according to claim 2, characterized in that, The exhaust gas inlet channel (21) extends at least partially in an arc shape, and the end of the mixing channel (22) is coaxially arranged with the exhaust pipe (3).

4. The waste gas recirculation mixing assembly according to claim 3, characterized in that, The mixing pipe (2) has a first guide section (23) at the outlet end (212). The first guide section (23) is connected to the exhaust gas inlet channel (21) and the mixing channel (22) respectively. The two side walls of the first guide section (23) are arranged opposite to each other along the axial direction of the outlet pipe (3) and are inclined to each other along the axial direction of the outlet pipe (3) so that the outlet direction of the outlet end (212) is inclined to the axial direction of the outlet pipe (3).

5. The waste gas recirculation mixing assembly according to claim 4, characterized in that, The angle between the air outlet direction of the air outlet end (212) and the axial direction of the air outlet pipe (3) is 80°.

6. The exhaust gas recirculation mixing assembly according to any one of claims 1 to 5, characterized in that, The mixing pipe (2) includes a first pipe body (24) and a second pipe body (25). The first pipe body (24) is connected to the air inlet pipe (1), and the second pipe body (25) is connected to the air outlet pipe (3). The first pipe body (24) and the second pipe body (25) are detachably connected.

7. The waste gas recirculation mixing assembly according to claim 1, characterized in that, The exhaust gas recirculation mixing assembly also includes a curved pipe (4), which is connected to the mixing pipe (2).

8. The waste gas recirculation mixing assembly according to claim 7, characterized in that, The mixing pipe (2) further includes a second guide section (26), which is disposed inside the mixing pipe (2) and located at the connection between the curved pipe (4) and the mixing pipe (2). The surface of the second guide section (26) near the curved pipe (4) is a guide surface (261), which is curved and the extended plane at the end has an angle with the axial direction of the curved pipe (4).

9. The waste gas recirculation mixing assembly according to claim 8, characterized in that, The second guide section (26) includes a first baffle (262) and a second baffle (263). The first baffle (262) and the second baffle (263) are respectively disposed on opposite sides of the connection between the curved pipe (4) and the mixing pipe (2). The distance between the first baffle (262) and the second baffle (263) gradually decreases from the end connected to the inner wall of the mixing pipe (2) to the end away from the inner wall of the mixing pipe (2).

10. A vehicle, characterized in that, The vehicle includes the exhaust gas recirculation mixing assembly as described in any one of claims 1 to 9.

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