EGR mixing structure, engine and vehicle

Abstract

The embodiment of the present application provides an EGR mixing structure, an engine and a vehicle, the EGR mixing structure comprising an air intake pipe, an exhaust gas intake pipe and a connecting portion, the air intake pipe having an air passage, the air passage having an air inlet and a mixed gas outlet, the exhaust gas intake pipe having an exhaust gas passage, the connecting portion being arranged between the air intake pipe and the exhaust gas intake pipe, the connecting portion comprising a connecting shell having a flow guide cavity and a flow guide arranged in the flow guide cavity, the flow guide separating the flow guide cavity into at least two flow-through channels, and each flow-through channel being in communication with the air passage and the exhaust gas passage respectively. The EGR mixing structure of the embodiment of the present application can improve the mixing uniformity of fresh air and exhaust gas.

Description

Technical Field

[0001] This application relates to the field of engine technology, specifically to an EGR hybrid structure, engine, and vehicle. Background Technology

[0002] Exhaust Gas Recirculation (EGR) is an effective measure to reduce NOx emissions in engine cylinders. Its working principle is to cool a portion of the engine's exhaust gas and then return it to the engine cylinders via the intake system to participate in the combustion process. Based on the exhaust gas intake location, it can be divided into low-pressure EGR and high-pressure EGR. High-pressure EGR takes gas before the catalytic converter, while low-pressure EGR takes gas after the catalytic converter. The gas composition in the low-pressure EGR combustion chamber comes from two parts: fresh air introduced through the air filter and exhaust gas taken from the catalytic converter and cooled by the EGR cooler. These two parts of gas mix before the turbocharger compressor, then pass through the turbocharger, intercooler, and intake manifold before entering the combustion chamber to participate in combustion.

[0003] However, in related technologies, the uneven mixing of fresh air and exhaust gas results in localized low oxygen content after the mixture enters the cylinder, which significantly affects combustion within the cylinder and consequently impacts engine performance. Summary of the Invention

[0004] In view of this, the main objective of the embodiments of this application is to provide an EGR mixing structure, engine and vehicle that can improve the mixing uniformity of fresh air and exhaust gas.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] A first aspect of this application provides an EGR hybrid structure, including:

[0007] An air intake pipe having an air passage having an air inlet and a mixed gas outlet;

[0008] An exhaust gas inlet pipe with an exhaust gas passage;

[0009] The connection portion disposed between the air intake pipe and the exhaust gas intake pipe includes a connecting shell having a flow guide cavity and a flow guide disposed within the flow guide cavity. The flow guide divides the flow guide cavity into at least two flow channels, each of which is connected to the air channel and the exhaust gas channel respectively.

[0010] In one embodiment, at least two sides of the flow guide are spaced apart from the sidewall of the flow guide cavity, so that the flow passages are formed at the intervals respectively.

[0011] In one embodiment, on a projection plane parallel to the cross-section of the exhaust gas passage, the projection of the guide element coincides with the projection of the cross-section of the exhaust gas passage in at least a partial area.

[0012] In one embodiment, the air channel extends along a first direction, and the guide member is spaced apart from the sidewall of the guide cavity on opposite sides along a second direction, wherein the second direction is perpendicular to the first direction.

[0013] In one embodiment, the flow guide is connected to the side wall of the flow guide cavity on one side along the first direction, and the flow guide is spaced apart from the side wall of the flow guide cavity on the other side along the first direction. The exhaust gas channel has an outlet communicating with the flow guide cavity. On a projection plane parallel to the cross-section of the exhaust gas channel, the projection of the flow guide and the projection of the outlet at least partially overlap.

[0014] In one embodiment, the projection of the flow guide has first boundary lines arranged opposite each other along the second direction, and the area where the projection of the flow outlet coincides with the projection of the flow guide is located between the two first boundary lines.

[0015] In one embodiment, the projection of the axial centerline of the exhaust gas passage is located within the projection area of ​​the guide member, and the distance between the two first boundary lines is not less than the maximum dimension of the projection of the outlet along the second direction, and not greater than 1.2 times the maximum dimension of the projection of the outlet along the second direction.

[0016] In one embodiment, along the first direction, the projection of the flow guide has a second boundary line, the second boundary line being located on the side of the flow guide and the sidewall of the flow guide cavity spaced apart, and the second boundary line curving toward the side where the projection of the flow guide is located.

[0017] In one embodiment, the exhaust gas passage has an outlet communicating with the flow guide cavity, and the flow guide has a flow guide surface on the side near the outlet, the flow guide surface being inclined relative to the plane where the outlet is located.

[0018] In one embodiment, the angle between the guide surface and the plane containing the flow outlet is not less than 30° and not greater than 70°; and / or,

[0019] The exhaust gas inlet pipe is located on the bottom side of the connection.

[0020] In one embodiment, the air inlet and the mixed gas outlet are located at opposite ends of the air passage, the exhaust gas passage is inclined toward the end of the air passage where the air inlet is located, and the angle between the axial centerline of the exhaust gas passage and the axial centerline of the air passage is not less than 30° and not greater than 90°.

[0021] In one embodiment, the connecting shell is disposed on the bottom side of the air intake pipe, and the distance between the bottom surface of the connecting shell and the outer wall surface of the air intake pipe is a first distance.

[0022] The first spacing is not greater than 0.5 times the inner diameter of the exhaust gas passage; and / or,

[0023] The exhaust gas passage has an outlet communicating with the guide cavity. The distance between the end face of the guide member near the air passage and the plane where the outlet is located is a second distance. The second distance is not less than the first distance and not more than twice the first distance.

[0024] In one embodiment, the end face of the guide member near the air channel smoothly transitions with the inner wall surface of the air channel.

[0025] In one embodiment, the connecting shell includes a bottom plate, a first side plate, a second side plate, and two third side plates. The third side plates are spaced apart on opposite sides of the bottom plate. The first side plate and the second side plate are located at opposite ends of the third side plates. The bottom plate, the first side plate, the second side plate, and the third side plates surround to form the flow guiding cavity. The flow guiding element is disposed on the second side plate.

[0026] In one embodiment, the second side plate is a curved plate that bends toward the side closer to the flow guide cavity, and the angle between the curved plate and the third side plate at the connection point is not less than 10° and not greater than 80°.

[0027] A second aspect of this application provides an engine including a turbocharger and an EGR mixing structure as described in any one of the preceding claims, wherein the mixture outlet is connected to the turbocharger.

[0028] In one embodiment, the booster includes a compressor with a pressure roller, the exhaust gas passage has an outlet communicating with the guide cavity, and the length of the airflow path from the center of the outlet to the center of the pressure roller in the axial direction along the air intake pipe is greater than 1.5 times the inner diameter of the air passage.

[0029] A third aspect of this application provides a vehicle, characterized in that it includes the engine described in any one of the foregoing embodiments.

[0030] This application provides an EGR mixing structure, an engine, and a vehicle. The connecting portion of the EGR mixing structure includes a connecting shell with a flow guide cavity and a flow guide member disposed within the flow guide cavity. The flow guide member divides the flow guide cavity into at least two flow channels, each of which communicates with an air passage and an exhaust gas passage, respectively. Thus, under the guidance of the flow guide member, exhaust gas flowing along the exhaust gas passage can flow into the air passage through different flow channels. This allows the exhaust gas to diffuse within the flow guide cavity and then mix with fresh air flowing along the air passage, resulting in a more thorough mixing of exhaust gas and fresh air, improving the mixing uniformity, and thereby ensuring engine performance. Attached Figure Description

[0031] Figure 1 This is a schematic diagram illustrating the interaction between an EGR hybrid structure and a turbocharger according to an embodiment of this application;

[0032] Figure 2 for Figure 1 Schematic diagram of the EGR hybrid structure;

[0033] Figure 3 for Figure 2 A cross-sectional view of the EGR hybrid structure along the top-bottom direction;

[0034] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0035] Figure 5 for Figure 2 A cross-sectional view of the EGR hybrid structure along the first direction;

[0036] Figure 6 for Figure 5 A schematic diagram of the EGR mixing structure in the projection plane parallel to the cross-section of the exhaust gas passage.

[0037] Figure 7 for Figure 5 A schematic diagram of the EGR hybrid structure from another perspective.

[0038] Explanation of reference numerals in the attached figures

[0039] EGR mixing structure 10; air intake pipe 11; air passage 11a; air inlet 11aa; mixed gas outlet 11ab; exhaust gas intake pipe 12; exhaust gas passage 12a; flow port 12aa; connecting part 13; connecting shell 131; guide cavity 131a; flow passage 131aa; bottom plate 1311; first side plate 1312; second side plate 1313; third side plate 1314; guide component 132; guide surface 132a; first boundary line 1321; second boundary line 1322; turbocharger 20; pressure roller 21. Detailed Implementation

[0040] In this application, the orientation or positional relationship of "first direction", "top" and "bottom" is based on the appendix. Figure 3 The directions or positional relationships shown, "second direction" is based on the attached... Figure 5 The orientation or positional relationship shown is for illustrative purposes only and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0041] One embodiment of this application provides an EGR mixing structure 10 (exhaust gas recirculation mixing structure), please refer to [link to relevant documentation]. Figure 2 and Figure 3 It includes an air intake pipe 11, an exhaust gas intake pipe 12, and a connecting part 13. The air intake pipe 11 has an air passage 11a, which has an air inlet 11aa and a mixed gas outlet 11ab. The exhaust gas intake pipe 12 has an exhaust gas passage 12a.

[0042] The air passage 11a is used to allow fresh air to flow in from the air inlet 11aa, mix with the exhaust gas, and then flow out from the mixed gas outlet 11ab. The exhaust gas flows along the exhaust gas passage 12a.

[0043] The specific shapes of the air intake pipe 11 and the exhaust gas intake pipe 12 can be determined according to the actual situation. For example, both the air intake pipe 11 and the exhaust gas intake pipe 12 can be straight round pipes to facilitate processing and manufacturing.

[0044] A connecting part 13 is disposed between the air intake pipe 11 and the exhaust gas intake pipe 12. The connecting part 13 includes a connecting shell 131 and a flow guide 132. The connecting shell 131 has a flow guide cavity 131a, and the flow guide 132 is disposed in the flow guide cavity 131a. The flow guide 132 divides the flow guide cavity 131a into at least two flow channels 131aa, and each flow channel 131aa is connected to the air channel 11a and the exhaust gas channel 12a, respectively.

[0045] Specifically, the flow passage 131aa is formed by the flow guide 132 dividing the flow guide cavity 131a. After the exhaust gas flowing out of the exhaust gas passage 12a flows to the flow guide 132, under the guidance of the flow guide 132, the exhaust gas can flow along different flow passages 131aa into the air passage 11a.

[0046] In fact, the connection positions between each flow channel 131aa and the air channel 11a are not the same. The guide 132 will change the flow direction of the exhaust gas, so that the exhaust gas can flow into the air channel 11a along different flow channels 131aa. This achieves the effect of allowing the exhaust gas to diffuse and then flow into the air channel 11a, thereby improving the uniformity of mixing between the exhaust gas and fresh air.

[0047] Depending on the specific structure and configuration of the flow guide 132, the flow channels 131aa can be configured to be interconnected or disconnected.

[0048] The formation method of the overcurrent channel 131aa is not limited; for example, please refer to [link to relevant documentation]. Figure 5 The guide member 132 is spaced apart from the sidewall of the guide cavity 131a on at least two sides, so that flow channels 131aa are formed at the intervals. That is, the guide member 132 is disposed in the guide cavity 131a, and its at least two sides are spaced apart from the sidewall of the guide cavity 131a, so that the exhaust gas flowing to the guide member 132 can flow from the intervals into the air channel 11a under the guidance of the guide member 132.

[0049] Another embodiment of this application provides an engine; please refer to [link / reference needed]. Figure 1 The engine includes a turbocharger 20 and an EGR mixing structure 10 as described in any embodiment of this application, with the mixture outlet 11ab connected to the turbocharger 20.

[0050] It should be noted that, in order to further promote the full mixing of fresh air and exhaust gas, the relative positional relationship between the exhaust gas intake pipe 12 and the turbocharger 20 can be adjusted.

[0051] For example, please refer to Figure 1 The booster includes a compressor with a pressure wheel 21, and the exhaust passage 12a has an outlet 12aa communicating with the guide cavity 131a. In the axial direction along the air intake pipe 11, the length C of the airflow path from the center of the outlet 12aa to the center of the pressure wheel 21 is greater than 1.5 times the inner diameter of the air passage 11a.

[0052] Another embodiment of this application provides a vehicle that includes the engine described in any embodiment of this application.

[0053] The connecting portion 13 of the EGR mixing structure 10 in this embodiment includes a connecting shell 131 with a flow guiding cavity 131a and a flow guiding member 132 disposed within the flow guiding cavity 131a. The flow guiding member 132 divides the flow guiding cavity 131a into at least two flow passages 131aa, each of which is connected to an air passage 11a and an exhaust gas passage 12a. Thus, under the guidance of the flow guiding member 132, the exhaust gas flowing along the exhaust gas passage 12a can flow into the air passage 11a along different flow passages 131aa. This allows the exhaust gas to diffuse within the flow guiding cavity 131a and then mix with the fresh air flowing along the air passage 11a, thereby enabling more thorough mixing of the exhaust gas and fresh air, improving the mixing uniformity, and thus ensuring engine performance.

[0054] In one embodiment, please refer to Figure 5 and Figure 6 On a projection plane parallel to the cross-section D of the exhaust gas passage 12a, the projection of the guide member 132 coincides with the projection of the cross-section D of the exhaust gas passage 12a in at least a partial area.

[0055] Specifically, if the exhaust gas inlet pipe 12 is a straight pipe, the projection of the guide member 132 will coincide with the projection area of ​​each cross-section D of the exhaust gas passage 12a, or the projection of the guide member 132 will cover the entire projection area of ​​each cross-section of the exhaust gas passage 12a. As a result, the exhaust gas flowing out of the exhaust gas passage 12a will change its flow direction under the obstruction of the guide member 132, so that it flows along each flow passage 131aa.

[0056] It is understandable that if the exhaust gas inlet pipe 12 is a bend and the cross-sections of the exhaust gas inlet pipe 12 are not parallel, then the projection of the guide 132 will at least coincide with a portion of the projection of the cross-section at the connection between the exhaust gas passage 12a and the guide cavity 131a, or cover its entire area.

[0057] In one embodiment, please refer to Figure 5 The air passage 11a extends along the first direction, and the guide member 132 is spaced apart from the side wall of the guide cavity 131a on opposite sides along the second direction, wherein the second direction is perpendicular to the first direction.

[0058] Specifically, the first direction is the extension direction of the air passage 11a, and the guide member 132 forms flow passages 131aa on opposite sides of the second direction perpendicular to the first direction. In fact, the exhaust gas flowing out of the exhaust gas passage 12a will diffuse to opposite sides of the guide member 132 along the second direction under the action of the guide member 132, and flow into the air passage 11a through the flow passages 131aa on both sides.

[0059] In one embodiment, please refer to Figure 3 and Figure 5 The guide member 132 is connected to the side wall of the guide cavity 131a on one side along the first direction, and the guide member 132 is spaced apart from the side wall of the guide cavity 131a on the other side along the first direction. The exhaust gas passage 12a has an outlet 12aa that communicates with the guide cavity 131a. On the projection plane parallel to the cross section D of the exhaust gas passage 12a, the projection of the guide member 132 and the projection of the outlet 12aa overlap in at least a partial area.

[0060] Specifically, the three sides of the flow guide 132 are spaced apart from the sidewall of the flow guide cavity 131a, that is, the two opposite sides of the flow guide 132 along the second direction and the one side of the flow guide 132 along the first direction have flow channels 131aa respectively.

[0061] It should be noted that the three current channels 131aa can be interconnected, but depending on the actual situation, the three current channels 131aa can also be disconnected.

[0062] The shape of the flow port 12aa is not limited, such as circle, ellipse, rectangle, etc.

[0063] The projection of the flow guide 132 can coincide with a portion of the projection of the flow port 12aa, or it can cover the entire projection area of ​​the flow port 12aa.

[0064] It should be noted that the overlap of at least some areas between the two projections does not mean that the guide element 132 is located at the flow port 12aa. In fact, the guide element 132 is disposed in the guide cavity 131a, and it can be located on the side of the guide cavity 131a near the flow port 12aa, so as to guide the airflow along the flow channels 131aa on both sides of the second direction and along the flow channel 131aa on one side of the first direction by blocking the exhaust gas flowing out of the flow port 12aa.

[0065] In one embodiment, please refer to Figure 6 The projection of the flow guide 132 has first boundary lines 1321 arranged opposite each other along the second direction. The area where the projection of the flow outlet 12aa coincides with the projection of the flow guide 132 is located between the two first boundary lines 1321. That is to say, the two first boundary lines 1321 are not within the projection range of the flow outlet 12aa, but are actually outside the projection range of the flow outlet 12aa. As a result, the flow guide 132 can guide the exhaust gas flowing out of the flow outlet 12aa to flow more evenly along the second direction into the flow channels 131aa on both sides.

[0066] In one embodiment, please refer to Figure 5 and Figure 6 The projection of the axial centerline of the exhaust gas passage 12a is located within the projection area of ​​the guide 132. The distance between the two first boundary lines 1321 is not less than the maximum dimension of the projection of the outlet 12aa along the second direction, and not greater than 1.2 times the maximum dimension of the projection of the outlet 12aa along the second direction.

[0067] Specifically, when the area where the projection of the overflow port 12aa overlaps with the projection of the guide member 132 is large, such as when the projection of the axial center line of the exhaust gas passage 12aa is also within the projection area of ​​the guide member 132, the size of the guide member 132 along the second direction needs to be increased to cover the area of ​​the overflow port 12aa along the second direction as much as possible, so that the guide member 132 can have a better guiding effect on the exhaust gas flowing out from the overflow port 12aa.

[0068] In fact, the distance between the two first boundary lines 1321 is the dimension of the projection of the guide 132 along the second direction.

[0069] Of course, the size of the guide 132 is not necessarily better the larger it is. If the size of the projection of the guide 132 along the second direction is too large, it will reduce the flow cross-sectional area of ​​the flow channels 131aa located on opposite sides of the guide 132 along the second direction, thereby weakening its flow capacity.

[0070] In one embodiment, please refer to Figure 6 In one direction, the projection of the flow guide 132 has a second boundary line 1322. The second boundary line 1322 is located on the side where the flow guide 132 and the sidewall of the flow guide cavity 131a are spaced apart, and the second boundary line 1322 bends on the side where the projection of the flow guide 132 is located. This avoids the flow guide 132 from excessively obstructing the flow port 12aa, thus preventing it from affecting the airflow capacity of the flow channel 131aa along the first direction of the flow guide 132.

[0071] Specifically, one side of the flow guide 132 along the first direction is connected to the sidewall of the flow guide cavity 131a, and the other side is spaced apart from the sidewall of the flow guide cavity 131a. In the first direction, the side of the flow guide 132 spaced apart from the sidewall of the flow guide cavity 131a is a curved surface that curves away from the space. From a projection perspective, this means that the second boundary line 1322 curves towards the side where the projection of the flow guide 132 is located.

[0072] In one embodiment, please refer to Figure 3 and Figure 4 2a has a flow port 12aa that communicates with the flow guide cavity 131a. The flow guide 132 has a flow guide surface 132a on the side near the flow port 12aa. The flow guide surface 132a is inclined relative to the plane where the flow port 12aa is located.

[0073] Specifically, the exhaust gas flowing out of the outlet 12aa will flow to the inclined guide surface 132a, and then, under the guidance of the guide surface 132a, it will flow along the outlet channel 131aa into the air channel 11a.

[0074] It should be noted that the inclination angle of the guide surface 132a has a significant impact on the guiding effect of the exhaust gas flowing out of the outlet 12aa. The smaller the inclination angle, the stronger the guiding effect of the guide surface 132a on the exhaust gas, but the greater the obstruction effect of the guide surface 132a on the exhaust gas flow. The larger the inclination angle, the weaker the guiding effect of the guide surface 132a on the exhaust gas, but the smaller the obstruction effect of the guide surface 132a on the exhaust gas flow. Preferably, the angle α between the guide surface 132a and the plane containing the outlet 12aa is not less than 30° and not greater than 70°.

[0075] In one specific embodiment, the exhaust gas inlet pipe 12 is located on the bottom side of the connecting portion 13. Since the air passage 11a is connected to the guide cavity 131a, some of the fresh air flowing along the air passage 11a also flows into the guide cavity 131a. Because the fresh air and the guide component 132 are at a lower temperature than the exhaust gas, when the exhaust gas flowing out from the outlet 12aa flows to the guide surface 132a, the condensate formed by the cooling will flow back along the inclined guide surface 132a and the exhaust gas passage 12a. Thus, after the exhaust gas and fresh air are mixed, the condensate formed can be prevented from flowing to the turbocharger 20, thereby preventing the condensate from impacting the compressor blades of the turbocharger 20 and causing blade damage.

[0076] In one embodiment, please refer to Figure 3 and Figure 4 Air inlet 11aa and mixed gas outlet 11ab are located at opposite ends of air passage 11a, and exhaust gas passage 12a is inclined toward the end of air passage 11a where air inlet 11aa is located.

[0077] Specifically, the exhaust gas passage 12a should not be inclined towards the end of the air passage 11a where the mixed gas outlet 11ab is located. This is to prevent the exhaust gas flowing out of the exhaust gas passage 12a from having excessive airflow resistance due to its flow direction being opposite to that of fresh air as it flows through the guide cavity 131a to the air passage 11a, which would be detrimental to the inflow of exhaust gas. Of course, the angle at which the exhaust gas passage 12a is inclined towards the end of the air passage 11a where the air inlet 11aa is located should not be too small either, as an excessively small angle would make it difficult for the exhaust gas and fresh air to mix.

[0078] Preferably, the angle β between the axial centerline of the exhaust gas passage 12a and the axial centerline of the air passage 11a is not less than 30° and not greater than 90°.

[0079] It should be noted that the exhaust gas passage 12a can also be perpendicular to the air passage 11a. That is, the angle between the two is equal to 90°.

[0080] In one embodiment, please refer to Figure 3 and Figure 4 The connecting shell 131 is disposed on the bottom side of the air intake pipe 11. The distance between the bottom surface of the connecting shell 131 and the outer wall surface of the air intake pipe 11 is a first distance A, which is not greater than 0.5 times the inner diameter of the exhaust gas passage 12a. Therefore, by reducing the distance between the bottom surface of the connecting shell 131 and the outer wall surface of the air intake pipe 11, the space inside the guide cavity 131a can be avoided from being too large. On the one hand, an excessively large space is not conducive to the guide component 132's guidance and diffusion of exhaust gas. On the other hand, it will also make the external dimensions of the EGR mixing structure 10 too large, thus occupying too much space inside the vehicle.

[0081] In one embodiment, please refer to Figure 3 and Figure 4 The distance between the end face of the guide 132 near the air passage 11a and the plane where the flow port 12aa is located is the second distance B. The second distance B is not less than the first distance A and not more than twice the first distance A.

[0082] Specifically, the second spacing B should not be less than the first spacing A, to prevent the end face of the guide member 132 near the air channel 11a from being too low, thus avoiding the exhaust gas that has been guided and diffused by the guide member 132 from re-merging. The second spacing B should not be greater than twice the first spacing A, to prevent the end face of the guide member 132 near the air channel 11a from being too high, thereby obstructing the flow of fresh air within the air channel 11a.

[0083] In one embodiment, the end face of the guide member 132 near the air channel 11a transitions smoothly with the inner wall surface of the air channel 11a.

[0084] Specifically, a smooth transition means that the end face of the guide member 132 near the air channel 11a is smoothly connected to the inner wall of the air channel 11a without abrupt changes (such as steps, gaps, etc.). This allows fresh air flowing along the air channel 11a, as well as exhaust gas or mixed gas flowing out of the guide cavity 131a, to flow smoothly along the end face of the guide member 132 near the air channel 11a, thereby reducing the obstruction effect of the guide member 132 on airflow.

[0085] The specific structure of the connecting shell 131 is not limited.

[0086] For example, please refer to Figure 2 and Figure 7 The connecting shell 131 includes a base plate 1311, a first side plate 1312, a second side plate 1313, and two third side plates 1314. The third side plates 1314 are spaced apart on opposite sides of the base plate 1311. The first side plate 1312 and the second side plate 1313 are located at opposite ends of the third side plate 1314. The base plate 1311, the first side plate 1312, the second side plate 1313, and the third side plate 1314 surround to form a flow guiding cavity 131a. The flow guiding element 132 is disposed on the second side plate 1313.

[0087] The second side plate 1313 can be a flat plate or a curved plate.

[0088] For example, please see Figure 2The second side plate 1313 is a curved plate that bends towards the side closest to the guide cavity 131a. The angle γ between the curved plate and the third side plate 1314 is not less than 10° and not greater than 80°. The angle between the curved plate and the third side plate 1314 is an acute angle, which allows the condensate formed after the exhaust gas mixes with the fresh air to flow back along the angle between the curved plate and the third side plate 1314, and can further discharge the condensate.

[0089] In one specific embodiment, the dimension of the base plate 1311 along the second direction is not less than 1.1 times the inner diameter of the exhaust gas channel 12a and not greater than the inner diameter of the air channel 11a, so as to facilitate the connection between the exhaust gas inlet pipe 12, the air inlet pipe 11 and the connecting shell 131.

[0090] Furthermore, the maximum dimension of the base plate 1311 along the first direction is greater than the maximum dimension of the outlet 12aa along the first direction. In fact, on the projection plane parallel to the outlet 12aa, the projection of the base plate 1311 covers the entire projection area of ​​the outlet 12aa.

[0091] In one specific embodiment, the first side plate 1312 is a flat plate, and the side of the first side plate 1312 near the air intake pipe 11 is an arc-shaped side that matches the bottom wall of the air intake pipe 11, that is, the curvature of the two is the same, so as to facilitate the connection between the connecting shell 131 and the air intake pipe 11.

[0092] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in a specific embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0093] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. An EGR hybrid structure, characterized in that, include: An air intake pipe having an air passage having an air inlet and a mixed gas outlet; An exhaust gas inlet pipe with an exhaust gas passage; The connection part disposed between the air intake pipe and the exhaust gas intake pipe includes a connecting shell having a flow guide cavity and a flow guide member disposed in the flow guide cavity. The flow guide member divides the flow guide cavity into at least two flow channels, and each flow channel is respectively connected to the air channel and the exhaust gas channel. The exhaust gas passage has an outlet communicating with the guide cavity. On a projection plane parallel to the cross-section of the exhaust gas passage, the projection of the guide component and the projection of the outlet overlap in at least a partial area. At least two sides of the flow guide are spaced apart from the sidewall of the flow guide cavity, so that the flow passages are formed at the intervals respectively; The air channel extends along a first direction, and the guide members are respectively spaced apart from the sidewalls of the guide cavity on opposite sides along a second direction, wherein the second direction is perpendicular to the first direction; The flow guide is connected to the side wall of the flow guide cavity on one side along the first direction, and the flow guide is spaced apart from the side wall of the flow guide cavity on the other side along the first direction. The projection of the flow guide has a first boundary line that is arranged opposite to each other along the second direction, and the area where the projection of the flow outlet coincides with the projection of the flow guide is located between the two first boundary lines. The connecting shell includes a bottom plate, a first side plate, a second side plate, and two third side plates. The third side plates are spaced apart on opposite sides of the bottom plate. The first side plate and the second side plate are located at opposite ends of the third side plates. The bottom plate, the first side plate, the second side plate, and the third side plates surround to form the flow guiding cavity. The flow guiding element is disposed on the second side plate.

2. The EGR hybrid structure according to claim 1, characterized in that, On a projection plane parallel to the cross-section of the exhaust gas passage, the projection of the guide element coincides with the projection of the cross-section of the exhaust gas passage in at least a partial area.

3. The EGR hybrid structure according to claim 1, characterized in that, The projection of the axial centerline of the exhaust gas passage is located within the projection area of ​​the guide member. The distance between the two first boundary lines is not less than the maximum dimension of the projection of the outlet along the second direction, and not greater than 1.2 times the maximum dimension of the projection of the outlet along the second direction.

4. The EGR hybrid structure according to claim 1, characterized in that, Along the first direction, the projection of the flow guide has a second boundary line, which is located on the side of the flow guide that is spaced apart from the sidewall of the flow guide cavity, and the second boundary line bends toward the side where the projection of the flow guide is located.

5. The EGR hybrid structure according to claim 1, characterized in that, The flow guide has a flow guiding surface on the side near the flow port, and the flow guiding surface is inclined relative to the plane where the flow port is located.

6. The EGR hybrid structure according to claim 5, characterized in that, The angle between the guide surface and the plane where the flow outlet is located is not less than 30° and not greater than 70°; and / or, The exhaust gas inlet pipe is located on the bottom side of the connection.

7. The EGR hybrid structure according to any one of claims 1-4, characterized in that, The air inlet and the mixed gas outlet are located at opposite ends of the air passage. The exhaust gas passage is inclined toward the end of the air passage where the air inlet is located. The angle between the axial centerline of the exhaust gas passage and the axial centerline of the air passage is not less than 30° and not greater than 90°.

8. The EGR hybrid structure according to any one of claims 1-4, characterized in that, The connecting shell is disposed on the bottom side of the air intake pipe, and the distance between the bottom surface of the connecting shell and the outer wall surface of the air intake pipe is a first distance. The first spacing is not greater than 0.5 times the inner diameter of the exhaust gas passage; and / or, The distance between the end face of the guide near the air channel and the plane where the flow port is located is the second distance. The second distance is not less than the first distance and not more than twice the first distance.

9. The EGR hybrid structure according to any one of claims 1-4, characterized in that, The end face of the air guide near the air channel smoothly transitions to the inner wall of the air channel.

10. The EGR hybrid structure according to claim 1, characterized in that, The second side plate is a curved plate that bends toward the side closer to the flow guide cavity, and the angle between the curved plate and the third side plate is not less than 10° and not greater than 80°.

11. An engine, characterized in that, It includes a turbocharger and an EGR mixing structure as described in any one of claims 1-10, wherein the mixed gas outlet is connected to the turbocharger.

12. The engine according to claim 11, characterized in that, The booster includes a compressor with a pressure roller, and the exhaust gas passage has an outlet communicating with the guide cavity. In the axial direction along the air intake pipe, the length of the airflow path from the center of the outlet to the center of the pressure roller is greater than 1.5 times the inner diameter of the air passage.

13. A vehicle, characterized in that, Includes the engine as described in claim 11 or 12.

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