Exhaust gas recirculation system and vehicle

Abstract

The application relates to an exhaust gas recirculation system and a vehicle. The exhaust gas recirculation system comprises a cooler, a venturi, a connecting piece and a one-way valve. The outlet of the cooler and the inlet of the venturi are arranged apart from each other. The connecting piece is connected between the outlet of the cooler and the inlet of the venturi. The connecting piece has a first gas inlet communicating with the outlet of the cooler and a first gas outlet communicating with the inlet of the venturi. The one-way valve is arranged in the connecting piece. The one-way valve has a gas inlet end communicating with the first gas inlet and a gas outlet end communicating with the first gas outlet. The first gas inlet and the first gas outlet communicate with each other through the one-way valve. The exhaust gas recirculation system is more compact by integrating the one-way valve with the connecting piece, so as to facilitate the arrangement in the vehicle.

Description

Technical Field

[0001] This application relates to the field of engine exhaust gas treatment equipment technology, and in particular to an exhaust gas recirculation system and vehicle. Background Technology

[0002] To reduce nitrogen oxides in engine exhaust, EGR (Exhaust Gas Recirculation) technology is used to redirect a portion of the exhaust gases produced by the engine into the intake side for re-combustion. Because the intake pressure is higher than the exhaust pressure in the low-speed range of the engine, exhaust gases have difficulty entering the intake side; a one-way valve is typically used to prevent backflow of air from the intake side. A cooler is also usually installed to cool the exhaust gases, and a venturi tube is used to measure the exhaust gas flow rate.

[0003] To address this, a waste gas recirculation system is provided in the related technology. This waste gas recirculation system is provided with a connector connecting the cooler and the venturi tube, and a housing and other parts are provided outside the connector for installing a one-way valve.

[0004] However, the exhaust gas recirculation system in the relevant technology is difficult to install inside the vehicle. Summary of the Invention

[0005] Therefore, it is necessary to provide a more compact exhaust gas recirculation system and vehicle that is easier to install, addressing the problem that exhaust gas recirculation systems are difficult to install in vehicles in related technologies.

[0006] According to one aspect of this application, an exhaust gas recirculation system is provided, comprising:

[0007] A cooler and a venturi tube, wherein the outlet of the cooler and the inlet of the venturi tube are spaced apart from each other;

[0008] A connector, connected between the outlet of the cooler and the inlet of the venturi tube, the connector having a first air inlet communicating with the outlet of the cooler and a first exhaust outlet communicating with the inlet of the venturi tube; and

[0009] A one-way valve is disposed within the connector. The one-way valve has an inlet end communicating with the first air inlet and an exhaust end communicating with the first exhaust port. The first air inlet and the first exhaust port are connected to each other by means of the one-way valve.

[0010] The aforementioned exhaust gas recirculation system integrates the one-way valve into the connector, making the structure of the exhaust gas recirculation system more compact and easier to arrange within a vehicle.

[0011] In one embodiment, the connector includes a connecting flange and a connecting pipe;

[0012] One end of the connecting flange is connected to the outlet of the cooler and is provided with the first air inlet, and the other end of the connecting flange is provided with a connecting flange exhaust port that communicates with the first air inlet;

[0013] One end of the connecting pipe is connected to the end of the connecting flange away from the cooler, and has a connecting pipe inlet communicating with the exhaust port of the connecting flange. The other end of the connecting pipe is connected to the inlet of the venturi tube and has a first exhaust port. The one-way valve is located inside the connecting pipe. The inlet end is communicating with the connecting pipe inlet, and the exhaust end is communicating with the first exhaust port. The connecting pipe inlet and the first exhaust port are connected to each other by means of the one-way valve.

[0014] In one embodiment, the connecting flange has a first flange at one end where the connecting flange vent is located, and the first flange is arranged around the connecting flange vent.

[0015] The connecting pipe has a second flange at one end where the air inlet is located. The second flange is arranged around the air inlet and is connected to the first flange.

[0016] The connector also includes a plurality of first fasteners respectively passing through the first flange and the second flange.

[0017] In one embodiment, the exhaust gas recirculation system further includes a seal;

[0018] The sealing element is disposed between the first flange and the second flange to form a seal between the first flange and the second flange.

[0019] In one embodiment, the axis of the air inlet of the connecting pipe is set at an angle to the axis of the first exhaust port;

[0020] The connecting pipe includes a first pipe body and a second pipe body; one end of the first pipe body is connected to the end of the connecting flange that has the exhaust port of the connecting flange, and is provided with the air inlet of the connecting pipe; the one-way valve is provided in the first pipe body, and the first pipe body extends along the axis of the air inlet of the connecting pipe; one end of the second pipe body is connected to the end of the first pipe body away from the connecting flange, and the other end of the second pipe body is connected to the inlet of the venturi tube and is provided with the first exhaust port; the second pipe body extends along the axis of the first exhaust port.

[0021] In one embodiment, the exhaust gas recirculation system further includes a first clamp, and one end of the connector having the first air inlet is connected to the cooler via the first clamp; and / or

[0022] The exhaust gas recirculation system also includes a second clamp, and the end of the connector with the first exhaust port is connected to the venturi tube through the second clamp.

[0023] In one embodiment, the exhaust gas recirculation system further includes a filter;

[0024] The filter element is located at the first exhaust port and is used to filter the gas flowing out of the first exhaust port from the connector.

[0025] In one embodiment, the filter element is provided with a plurality of filter holes communicating with the first exhaust port, and a plurality of first mounting holes provided on the outer side of all the filter holes along the radial direction of the first exhaust port.

[0026] The connector is provided with second mounting holes that correspond one-to-one with the first mounting holes;

[0027] The exhaust gas recirculation system also includes second fasteners that correspond one-to-one with the first mounting holes, with each second fastener passing through the corresponding first mounting hole and second mounting hole.

[0028] According to another aspect of this application, a vehicle is provided, including an exhaust gas recirculation system as described in any of the above embodiments.

[0029] In one embodiment, the vehicle further includes an engine exhaust system and an engine intake system:

[0030] The exhaust port of the engine exhaust system is connected to the inlet of the cooler;

[0031] The air intake of the engine intake system is connected to the outlet of the venturi tube. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of an exhaust gas recirculation system in one embodiment of this application.

[0033] Figure 2 for Figure 1 An exploded view of the connector in the illustrated embodiment.

[0034] Figure 3 for Figure 1 A schematic diagram of the connecting flange in the illustrated embodiment.

[0035] Figure 4 for Figure 1 The illustrated embodiment shows a structural schematic diagram of the connecting flange from another perspective.

[0036] Figure 5 for Figure 1A schematic diagram of the connecting pipe in the illustrated embodiment.

[0037] Figure 6 for Figure 1 The schematic diagram of the connecting pipe in the embodiment shown is viewed from another angle.

[0038] Figure 7 for Figure 1 A partial cross-sectional view of the connecting pipe in the illustrated embodiment.

[0039] Figure 8 for Figure 1 The illustrated embodiment shows a schematic diagram of the assembly of the connector and the filter.

[0040] Figure 9 for Figure 1 A schematic diagram of the filter element in the illustrated embodiment.

[0041] Figure 10 This is a schematic diagram of an exhaust gas recirculation system, an engine intake system, and an engine exhaust system in one embodiment of this application.

[0042] Label Explanation:

[0043] 100. Exhaust gas recirculation system;

[0044] 10. Cooler;

[0045] 20. Venturi tube;

[0046] 30. Connecting component; 30a. First air inlet; 30b. First exhaust port; 31. Connecting flange; 31a. Connecting flange exhaust port; 311. First flange; 32. Connecting pipe; 32a. Connecting pipe air inlet; 321. Second flange; 322. First pipe body; 323. Second pipe body; 324. Transition component;

[0047] 40. One-way valve; 40a. Inlet end; 40b. Exhaust end;

[0048] 50. First fastener;

[0049] 60. Filter element; 60a. Filter hole; 60b. First mounting hole;

[0050] 70. Second fastener;

[0051] 80. EGR valve;

[0052] 200. Vehicles;

[0053] 201. Engine exhaust system;

[0054] 202. Engine intake system. Detailed Implementation

[0055] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0056] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0057] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0059] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0061] Figure 1 This is a schematic diagram of the exhaust gas recirculation system in one embodiment of this application; Figure 2 for Figure 1 An exploded view of the connector in the illustrated embodiment.

[0062] See Figure 1-2 The exhaust gas recirculation system 100 provided in one embodiment of this application includes a cooler 10, a venturi tube 20, a connector 30, and a one-way valve 40.

[0063] The outlet of the cooler 10 and the inlet of the venturi tube 20 are spaced apart from each other. A connector 30 is connected between the outlet of the cooler 10 and the inlet of the venturi tube 20. The connector 30 has a first air inlet 30a communicating with the outlet of the cooler 10 and a first exhaust port 30b communicating with the inlet of the venturi tube 20. A one-way valve 40 (see...) Figure 2 The one-way valve 40 is located in the connector 30 and has an intake end 40a that communicates with the first intake port 30a and an exhaust end 40b that communicates with the first exhaust port 30b. The first intake port 30a and the first exhaust port 30b are connected to each other by means of the one-way valve 40.

[0064] The aforementioned exhaust gas recirculation system 100, by incorporating a cooler 10 to cool the exhaust gas before recirculation, lowers the combustion chamber temperature, improves engine efficiency, and reduces combustion emissions. A venturi tube 20 is used to measure exhaust gas flow. A connector 30 connects the outlet of the cooler 10 to the inlet of the venturi tube 20, allowing the exhaust gas, after being cooled by the cooler 10, to enter the connector 30 through its first inlet 30a and then through its first exhaust port 30b. A one-way valve 40 within the connector 30 connects the first inlet 30a and the first exhaust port 30b to prevent backflow, thereby increasing the EGR rate and reducing engine fuel consumption. Furthermore, since the one-way valve 40 is located within the connector 30, the one-way valve 40 is integrated with the connector 30, thus eliminating the need for additional parts for installing the one-way valve 40. This reduces the number of engine parts and makes the exhaust gas recirculation system 100 more compact, easier to arrange, and easier to install.

[0065] Specifically, the venturi tube 20 is configured to calculate the exhaust gas flow rate through temperature and pressure measurements.

[0066] Optionally, the check valve 40 is interference-fitted within the connector 30 to fix the check valve 40 relative to the connector 30.

[0067] In some embodiments, the exhaust gas recirculation system 100 further includes a first clamp (not shown in the figure), and one end of the connector 30 having a first air inlet 30a is connected to the cooler 10 via the first clamp. Thus, the first clamp is provided to provide a tight clamping connection between the end of the cooling pipe having an outlet and the end of the connector 30 having the first air inlet 30a.

[0068] In some embodiments, the exhaust gas recirculation system 100 further includes a second clamp (not shown in the figure), and the end of the connector 30 with the first exhaust port 30b is connected to the venturi tube 20 via the second clamp. Thus, the second clamp is provided to provide a tight clamping connection between the end of the connector 30 with the first exhaust port 30b and the end of the venturi tube 20 with the inlet.

[0069] In some embodiments, such as Figure 1-2As shown, the connector 30 includes a connecting flange 31 and a connecting pipe 32. One end of the connecting flange 31 is connected to the outlet of the cooler 10 and has a first air inlet 30a. The other end of the connecting flange 31 has a connecting flange exhaust port 31a communicating with the first air inlet 30a. One end of the connecting pipe 32 is connected to the end of the connecting flange 31 away from the cooler 10 and has a connecting pipe inlet 32a communicating with the connecting flange exhaust port 31a. The other end of the connecting pipe 32 is connected to the inlet of the venturi tube 20 and has a first exhaust port 30b. A one-way valve 40 is located inside the connecting pipe 32. The inlet end 40a communicates with the connecting pipe inlet 32a, and the exhaust end 40b communicates with the first exhaust port 30b. The connecting pipe inlet 32a and the first exhaust port 30b are connected to each other by means of the one-way valve 40. Thus, by providing the connecting member 30, which includes a connecting flange 31 and the connecting member 30, the connecting flange 31 is used to facilitate connection with the cooler 10, and the connecting pipe 32 is used to facilitate connection with the venturi tube 20. Furthermore, since the one-way valve 40 is located inside the connecting pipe 32, it is easier to assemble the one-way valve 40 inside the connecting pipe 32.

[0070] Figure 3 for Figure 1 A schematic diagram of the connecting flange in the illustrated embodiment.

[0071] Specifically, in combination Figure 1 and Figure 3 As shown, the end of the connecting flange 31 with the first air inlet 30a is connected to the cooler 10 via the first clamp.

[0072] Figure 4 for Figure 1 A schematic diagram of the connecting flange in the illustrated embodiment from another perspective; Figure 5 for Figure 1 A schematic diagram of the connecting pipe in the illustrated embodiment.

[0073] In some embodiments, such as Figure 2 and Figure 4-5 As shown, the connecting flange 31 has a first flange 311 at one end with a connecting flange vent 31a, and the first flange 311 surrounds the connecting flange vent 31a. The connecting pipe 32 has a second flange 321 at one end with a connecting pipe inlet 32a, and the second flange 321 surrounds the connecting pipe inlet 32a and abuts against the first flange 311. The connector 30 also includes a plurality of first fasteners 50 respectively passing through the first flange 311 and the second flange 321. In this way, by providing the first fasteners 50, the connecting flange 31 and the connecting pipe 32 can be detachably connected by means of the first fasteners 50, and the connecting flange 31 and the connecting pipe 32 can be easily assembled and disassembled. By providing the first flange 311 on the connecting flange 31 and the second flange 321 on the connecting pipe 32, space is provided for installing the first fasteners 50.

[0074] Specifically, all the first fasteners 50 are spaced apart from each other along the circumference of the connecting flange vent 31a to improve the connection reliability between the connecting flange 31 and the connecting pipe 32.

[0075] In some embodiments, the exhaust gas recirculation system 100 further includes a seal (not shown) disposed between the first flange 311 and the second flange 321 to form a seal between the first flange 311 and the second flange 321, thereby preventing air leakage at the connection between the first flange 311 and the second flange 321.

[0076] Optionally, the first flange 311 has a sealing element mounting groove (not shown in the figure) surrounding the connecting flange vent 31a on the side that mates with the second flange 321, and the sealing element is disposed in the sealing element mounting groove.

[0077] In one embodiment, the seal is an O-ring.

[0078] Figure 6 for Figure 1 The schematic diagram of the connecting pipe in the embodiment shown is viewed from another angle.

[0079] In some embodiments, such as Figure 1-2 As shown, the axis of the connecting pipe inlet 32a is angled to the axis of the first exhaust port 30b. Combined with... Figure 5-6 As shown, the connecting pipe 32 includes a first pipe body 322 and a second pipe body 323. One end of the first pipe body 322 is connected to the end of the connecting flange 31 that has a connecting flange exhaust port 31a, and it also has a connecting pipe inlet 32a. A one-way valve 40 is disposed inside the first pipe body 322, and the first pipe body 322 extends along the axis of the connecting pipe inlet 32a. One end of the second pipe body 323 is connected to the end of the first pipe body 322 away from the connecting flange 31, and the other end of the second pipe body 323 is connected to the inlet of the venturi tube 20 and has a first exhaust port 30b. The second pipe body 323 extends along the axis of the first exhaust port 30b. It should be noted that, in order to adapt to the arrangement space inside the vehicle 200, the axis of the first air inlet 30a is set at an angle to the axis of the first exhaust port 30b. Therefore, by setting the axis of the connecting pipe inlet 32a at an angle to the axis of the first exhaust port 30b, the connecting pipe 32, which connects the connecting flange 31 and the venturi tube 20, meets the space requirements, thereby further improving the ease of installation of the exhaust gas recirculation system 100 within the vehicle 200. The first pipe body 322 is provided to facilitate the installation of the one-way valve 40, and the second pipe body 323 is provided to connect the first pipe body 322 to the inlet of the venturi tube 20.

[0080] Optionally, the one-way valve 40 is interference-fitted inside the first pipe body 322.

[0081] Specifically, the first tube 322 has an inner cavity for accommodating the one-way valve 40, and the inner cavity is connected to the air inlet 32a of the connecting pipe and the end of the second tube 323 away from the venturi tube 20.

[0082] Figure 7 for Figure 1 A partial cross-sectional view of the connecting pipe in the illustrated embodiment.

[0083] In some embodiments, combined with Figure 2 and Figure 7 As shown, the connecting pipe 32 also includes a transition piece 324 extending along a curve. One end of the transition piece 324 is connected to the end of the first pipe body 322 away from the connecting flange 31 and communicates with the first pipe body 322. The other end of the transition piece 324 is connected to the end of the second pipe body 323 away from the venturi tube 20 and communicates with the second pipe body 323. Thus, by providing the transition piece 324, a smooth transition is achieved at the connection between the first pipe body 322 and the second pipe body 323, thereby reducing the impact of the change in the flow direction of the exhaust gas flow when it passes through the transition piece 324 on the exhaust gas flow.

[0084] Specifically, in combination Figure 2 and Figure 6 As shown, one end of the connecting pipe 32 with the first exhaust port 30b is connected to the venturi tube 20 via a second clamp. More specifically, one end of the second pipe body 323 with the first exhaust port 30b is connected to the venturi tube 20 via a second clamp.

[0085] Figure 8 for Figure 1 A schematic diagram of the assembly of the connector and the filter element in the illustrated embodiment; Figure 9 for Figure 1 A schematic diagram of the filter element in the illustrated embodiment.

[0086] In some embodiments, such as Figure 8-9 As shown, the exhaust gas recirculation system 100 also includes a filter element 60, which is disposed at the first exhaust port 30b and is used to filter the gas flowing out of the first exhaust port 30b from the connector 30. Thus, by providing the filter element 60, the one-way valve 40 (see...) is avoided. Figure 2 After breaking, fragments of the one-way valve 40 entered the engine intake system through the venturi tube 20, causing engine damage.

[0087] Optionally, combined Figure 6 and Figure 8 As shown, the filter element 60 is embedded in the end of the second pipe body 323 where the first exhaust port 30b is located. In this way, the second pipe body 323 provides space for installing the filter element 60, so that the structure of the exhaust gas recirculation system 100 is more compact and easier to arrange.

[0088] In one embodiment, the filter element 60 is configured to be circular.

[0089] It should be understood that the radial dimension D1 of the filter element 60 is greater than the radial dimension of the first exhaust port 30b.

[0090] In some embodiments, such as Figure 8-9 As shown, the filter element 60 has a plurality of filter holes 60a communicating with the first exhaust port 30b, and a plurality of first mounting holes 60b located radially outward of all the filter holes 60a along the first exhaust port 30b. The connector 30 has second mounting holes (not shown in the figure) corresponding one-to-one with the first mounting holes 60b. The exhaust gas recirculation system 100 also includes second fasteners 70 (see figure) corresponding one-to-one with the first mounting holes 60b. Figure 8 Each second fastener 70 passes through a corresponding first mounting hole 60b and second mounting hole. This allows the filter element 60 to be mounted on the connector 30 via the second fasteners 70, facilitating assembly between the filter element 60 and the connector 30. Furthermore, by providing multiple filter holes 60a, it ensures that the filter element 60 flows into the venturi tube 20 (see...) Figure 1 ) exhaust gas flow rate.

[0091] Specifically, such as Figure 9 As shown, the aperture D2 of the filter hole 60a is smaller than the aperture D3 of the first mounting hole 60b. This allows the filter element 60 to prevent smaller debris from entering the engine intake system through the venturi tube 20.

[0092] In some embodiments, such as Figure 8-9 As shown, multiple first mounting holes 60b are spaced apart from each other along the circumference of the first exhaust port 30b.

[0093] In one embodiment, the number of first mounting holes 60b is four. In other embodiments, the number of first mounting holes 60b may be set differently according to the needs of use, as long as the filter element 60 is reliably fixed relative to the connector 30, and the number of first mounting holes 60b is not limited here.

[0094] The exhaust gas recirculation system 100 provided in this application can be applied to heavy-duty natural gas engines.

[0095] Figure 10 This is a schematic diagram of an exhaust gas recirculation system, an engine intake system, and an engine exhaust system in one embodiment of this application.

[0096] According to another aspect of this application, a vehicle 200 is provided, including an exhaust gas recirculation system 100 as described in any of the above embodiments.

[0097] In some embodiments, such as Figure 10As shown, the vehicle 200 also includes an engine exhaust system 201 and an engine intake system 202. The exhaust port of the engine exhaust system 201 is connected to the inlet of the cooler 10, and the intake port of the engine intake system 202 is connected to the outlet of the venturi tube 20. Thus, the exhaust gas generated by the engine exhaust system 201 passes through the cooler 10, the connector 30, and the venturi tube 20 before entering the engine intake system 202. The cooler 10 cools the exhaust gas generated by the engine exhaust system 201, a one-way valve 40 located in the connector 30 prevents backflow of intake gas, and the venturi tube 20 measures the exhaust gas flow rate.

[0098] In some embodiments, such as Figure 10 As shown, the exhaust gas recirculation system 100 also includes an EGR valve 80, which is located between the outlet of the venturi tube 20 and the intake port of the engine intake system 202, and is used to control the exhaust gas entering the intake port of the engine intake system 202.

[0099] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A waste gas recirculation system, characterized in that, include: A cooler and a venturi tube, wherein the outlet of the cooler and the inlet of the venturi tube are spaced apart from each other; A connector is provided between the outlet of the cooler and the inlet of the venturi tube. The connector includes a connecting flange and a connecting pipe. One end of the connecting flange is connected to the outlet of the cooler and has a first air inlet. The connecting pipe includes a first pipe body, a second pipe body, and a transition piece. One end of the first pipe body is connected to the connecting flange. One end of the second pipe body is connected to the inlet of the venturi tube and has a first exhaust port. The transition piece extends along a curve and connects the first pipe body and the second pipe body. A one-way valve is disposed in the first pipe body. The one-way valve has an air inlet end that communicates with the first air inlet and an air outlet end that communicates with the first air outlet. The first air inlet and the first air outlet are connected to each other by means of the one-way valve. A filter element is disposed at the first exhaust port and is used to filter the gas flowing out of the first exhaust port from the connector.

2. The waste gas recirculation system according to claim 1, characterized in that, One end of the connecting flange is connected to the outlet of the cooler, and the other end of the connecting flange is provided with a connecting flange exhaust port that communicates with the first air inlet. One end of the connecting pipe is connected to the end of the connecting flange away from the cooler, and a connecting pipe inlet is provided that communicates with the exhaust port of the connecting flange; the one-way valve is located inside the connecting pipe, the inlet end communicates with the connecting pipe inlet, the exhaust end communicates with the first exhaust port, and the connecting pipe inlet and the first exhaust port are connected to each other by means of the one-way valve.

3. The waste gas recirculation system according to claim 2, characterized in that, The connecting flange has a first flange at one end where the connecting flange vent is located, and the first flange is arranged around the connecting flange vent. The connecting pipe has a second flange at one end where the air inlet is located. The second flange is arranged around the air inlet and is connected to the first flange. The connector also includes a plurality of first fasteners respectively passing through the first flange and the second flange.

4. The waste gas recirculation system according to claim 3, characterized in that, The exhaust gas recirculation system also includes seals; The sealing element is disposed between the first flange and the second flange to form a seal between the first flange and the second flange.

5. The waste gas recirculation system according to claim 2, characterized in that, The axis of the air inlet of the connecting pipe is set at an angle to the axis of the first exhaust port; The connecting pipe includes a first pipe body and a second pipe body; one end of the first pipe body is connected to the end of the connecting flange that has the exhaust port of the connecting flange, and is provided with the air inlet of the connecting pipe; the one-way valve is provided in the first pipe body, and the first pipe body extends along the axis of the air inlet of the connecting pipe; one end of the second pipe body is connected to the end of the first pipe body away from the connecting flange, and the other end of the second pipe body is connected to the inlet of the venturi tube and is provided with the first exhaust port; the second pipe body extends along the axis of the first exhaust port.

6. The waste gas recirculation system according to claim 1, characterized in that, The exhaust gas recirculation system further includes a first clamp, and one end of the connector having the first air inlet is connected to the cooler via the first clamp; and / or The exhaust gas recirculation system also includes a second clamp, and the end of the connector with the first exhaust port is connected to the venturi tube through the second clamp.

7. The waste gas recirculation system according to claim 1, characterized in that, The filter element is provided with a plurality of filter holes communicating with the first exhaust port, and a plurality of first mounting holes located on the outer side of all the filter holes along the radial direction of the first exhaust port. The connector is provided with second mounting holes that correspond one-to-one with the first mounting holes; The exhaust gas recirculation system also includes second fasteners that correspond one-to-one with the first mounting holes, with each second fastener passing through the corresponding first mounting hole and second mounting hole.

8. A vehicle, characterized in that, Includes the exhaust gas recirculation system as described in any one of claims 1 to 7.

9. The vehicle according to claim 8, characterized in that, The vehicle also includes an engine exhaust system and an engine intake system. The exhaust port of the engine exhaust system is connected to the inlet of the cooler; The air intake of the engine intake system is connected to the outlet of the venturi tube.

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