An EGR check valve and an EGR system

Abstract

This application discloses an EGR one-way valve and an EGR system. The EGR one-way valve includes a base and a valve plate. The base has an intake side and an exhaust side located on both sides of the intake side. The exhaust side is arranged at an angle relative to the intake side. Along the angle direction of the exhaust side, the exhaust side has at least two exhaust surfaces with exhaust ports. Each exhaust surface is provided with a valve plate, which is used to control the opening and closing of the exhaust port of the corresponding exhaust surface. Along the gas flow direction, the angle between the plane containing the at least two exhaust surfaces on the exhaust side and the plane containing the intake side gradually increases. This solution adjusts the angle between the plane containing the exhaust surface and the plane containing the intake side according to the gas pressure distribution on the exhaust port plane, optimizes the force of exhaust gas acting on the valve plate, increases the opening angle of the valve plates on different exhaust surfaces, reduces the exhaust gas outlet resistance, and improves the EGR rate of the engine.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to an EGR check valve and an EGR system. Background Technology

[0002] EGR (Exhaust Gas Recirculation) system returns a small portion of the exhaust gas produced by a diesel or gasoline engine to the cylinders, reducing NOx formation and improving the engine's emissions levels.

[0003] like Figure 1 The diagram shown is a schematic of the EGR system of the relevant technology. After the exhaust gas is discharged through the exhaust manifold 01, part of the exhaust gas passes through the EGR valve 02, the EGR cooler 03 and the EGR check valve 04 and enters the EGR cooling pipeline 05, and then enters the intake pipe 06 through the EGR cooling pipeline.

[0004] The function of EGR one-way valve 04 is to prevent the intake air from flowing back into the EGR cooler 03 and EGR valve 02 through the EGR cooling pipe 05 when the intake pressure is greater than the exhaust pressure, which would cause the intake pressure to drop and the engine performance to decrease.

[0005] like Figures 2-5 The diagram shows the structure of a traditional EGR check valve. The EGR check valve has a base 041, an inlet 042, a sealing ring, a valve plate 043, and an exhaust port 044. The valve plate 043 covers the exhaust port 044. One end of the valve plate 043 near the inlet 042 is fixed by a rivet 045, and the other end of the valve plate 043 away from the inlet 042 is a free end. When the exhaust gas pressure is higher than the intake pressure, the valve plate 043 deforms, the free end of the valve plate 043 lifts up, and the valve plate 043 opens. When the exhaust gas pressure is lower than the intake pressure, the valve plate 043 does not deform and closes.

[0006] The traditional EGR one-way valve's valve plate 043 is a cantilever beam structure. The free end of valve plate 043 bends and deforms away from the base 041 relative to the fixed end. After opening, valve plate 043 is arc-shaped, limiting its opening area and resulting in high exhaust gas resistance, thus affecting the engine's EGR rate. Therefore, how to improve the engine's EGR rate has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] This application proposes an EGR one-way valve to reduce exhaust gas resistance and improve the engine's EGR rate. This application also proposes an EGR system.

[0008] To achieve the above objectives, this application provides an EGR check valve, including a base and a valve plate.

[0009] The base has an air intake side and an exhaust side located on both sides of the air intake side. The exhaust side is arranged at an angle relative to the air intake side. Along the angle of the exhaust side, the exhaust side has at least two exhaust surfaces. An exhaust port is opened on the exhaust surface, and a valve plate is provided on each exhaust surface. The valve plate is used to open or close the exhaust port.

[0010] The angle between the plane containing at least two of the exhaust surfaces and the plane containing the intake side gradually increases along the gas flow direction.

[0011] Preferably, in the above-mentioned EGR check valve, the exhaust side has at least two rows of exhaust surfaces along the setting direction perpendicular to the exhaust surface.

[0012] Preferably, in the above-mentioned EGR check valve, the widths of at least two exhaust surfaces in the same row along the inclined direction of the exhaust side are equal or unequal.

[0013] Alternatively, at least two of the exhaust surfaces located in the same row may have equal or unequal lengths.

[0014] Preferably, in the above-mentioned EGR check valve, the exhaust surfaces of different rows are at the same or different heights along the gas flow direction.

[0015] Preferably, in the above-mentioned EGR check valve, the intake side has an intake port, which is connected to the two exhaust ports on the exhaust side.

[0016] Preferably, in the above-mentioned EGR one-way valve, the base has a partition plate for separating two adjacent exhaust ports, the partition plate is perpendicular to the plane where the intake side is located, and the end of each partition plate near the intake side is flush.

[0017] Preferably, in the above-mentioned EGR one-way valve, the fixed end of the valve plate is connected to the exhaust surface by a rivet, and the fixed end of the valve plate is the end of the valve plate closer to the intake side.

[0018] Preferably, in the above-mentioned EGR one-way valve, the fixed end of the valve plate is hinged to the exhaust surface, and the fixed end of the valve plate is the end of the valve plate closer to the intake side.

[0019] Preferably, in the above-mentioned EGR check valve, the valve plate is a metal plate or a non-metal plate.

[0020] An EGR system includes an EGR check valve, wherein the EGR check valve is the EGR check valve described in any of the above embodiments.

[0021] The EGR one-way valve provided in this application includes a base and a valve plate. The base has an intake side and an exhaust side located on both sides of the intake side. The exhaust side is arranged at an angle relative to the intake side. Along the angle direction of the exhaust side, the exhaust side has at least two exhaust surfaces, each with an exhaust port. Each exhaust surface is provided with a valve plate, which controls the opening and closing of the exhaust port of the corresponding exhaust surface. Along the gas flow direction, the angle between the plane containing the at least two exhaust surfaces on the exhaust side and the plane containing the intake side gradually increases. This solution adjusts the angle between the plane containing the exhaust surface and the plane containing the intake side based on the gas pressure distribution on the exhaust port plane, optimizing the force of exhaust gas acting on the valve plate, increasing the opening angle of the valve plates on different exhaust surfaces, reducing exhaust gas resistance, and improving the engine's EGR rate.

[0022] This solution also discloses an EGR system, including an EGR check valve, wherein the EGR check valve is the EGR check valve described in any of the above solutions. Since the EGR check valve has the aforementioned technical effects, the EGR system with this EGR check valve also has the same technical effects, and will not be elaborated further here. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0024] Figure 1 This is the schematic diagram of the EGR system;

[0025] Figure 2 This is a schematic diagram of the existing EGR check valve.

[0026] Figure 3 This is a schematic diagram of the bottom structure of an existing EGR check valve;

[0027] Figure 4 This is a schematic diagram of the existing EGR check valve opening structure;

[0028] Figure 5 This is a side view of the existing EGR check valve when it is open;

[0029] Figure 6 This is a pressure distribution diagram within an existing EGR check valve;

[0030] Figure 7 This is a pressure distribution diagram of the outlet plane of an existing EGR check valve;

[0031] Figure 8 This is a schematic diagram of the EGR check valve closing structure in this application;

[0032] Figure 9 This is a schematic diagram of the EGR check valve opening structure in this application;

[0033] Figure 10 This is a schematic diagram of the bottom structure of the EGR check valve in this application;

[0034] Figure 11 This is a schematic diagram of the structure of the EGR check valve (without valve plate) of this application;

[0035] Figure 12 This is a cross-sectional view of the EGR check valve in this application;

[0036] Figure 13 This is a side view of the EGR check valve of this application;

[0037] Figure 14 yes Figure 13 A magnified view of part I;

[0038] Figure 15 This is a force analysis diagram of the EGR check valve in this application;

[0039] Figure 16 This is a comparison chart of the opening degree of the traditional ERR check valve and the opening degree of the ERR check valve in this solution.

[0040] The attached diagram is described below:

[0041] 01-Exhaust manifold; 02-EGR valve; 03-EGR cooler; 04-EGR check valve; 05-EGR aftercooler piping; 06-Intake pipe;

[0042] 041-Base; 042-Air inlet; 043-Valve plate; 044-Exhaust port; 045-Rivet;

[0043] 1-Base; 11-Exhaust surface; 12-Exhaust port; 13-Inlet port; 14-Blocking plate; 2-Valve plate; 3-Rivet. Detailed Implementation

[0044] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0045] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features.

[0046] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0047] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0048] Figures 2-5 The EGR check valve is a related technology. The EGR check valve includes a base and a valve plate. The base is triangular prism-shaped and has a first rectangular surface, a second rectangular surface and a third rectangular surface. The first rectangular surface is the air intake side and has an air intake port. The second and third rectangular surfaces are the exhaust side and have exhaust ports. The exhaust ports and the air intake ports are connected. The valve plate is installed on the second and third rectangular surfaces and is used to open or close the exhaust ports.

[0049] The end of the valve plate near the intake side is fixed to the base, while the end of the valve plate away from the intake side is not fixed. For ease of subsequent description, this solution refers to the end of the valve plate connected to the base as the fixed end and the end of the valve plate away from the intake side as the free end.

[0050] The valve plate opens when its free end deforms and springs up, as shown below. Figure 4 and Figure 5 As shown, the height to which the valve plate bounces up depends not only on the pressure difference between the exhaust gas pressure and the intake gas pressure, but also on the elastic deformation capability of the valve plate material itself. The ability of the valve plate to deform and bounce (or the valve plate opening) is inversely proportional to the stiffness of the valve plate. The smaller the stiffness of the valve plate, the greater the ability of the valve plate to deform and bounce (or the valve plate opening), and the greater the stiffness of the valve plate, the smaller the ability of the valve plate to deform and bounce (or the valve plate opening).

[0051] According to gas dynamics, when gas moves in a pipeline, the pressure distribution along the pipe wall exhibits a radial decreasing trend from the center outwards due to the frictional resistance of the pipe wall and the frictional force between gases. That is, the central region of the pipeline is a high-pressure area, and the region along the pipe wall is a low-pressure area. The pressure distribution diagram obtained by performing CFD (Computational Fluid Dynamics) simulation on the gas inside a traditional EGR check valve is shown below. Figure 6 As shown, the pressure distribution at the outlet plane of the EGR check valve is as follows: Figure 7 As shown. From Figure 6 and Figure 7 It can be seen that the pressure of the exhaust gas is high at the free end of the valve plate on the exhaust port plane and low at the fixed end of the valve plate. Due to the influence of the valve plate opening method, the valve plate opening gradually increases from the fixed end to the free end. A larger opening will cause the pressure at the free end of the valve plate to increase further and the pressure at the fixed end to decrease further, resulting in uneven exhaust port pressure of the EGR check valve, which further increases the exhaust gas outlet resistance.

[0052] Figure 8 and Figure 9 The EGR check valve disclosed in this solution includes a base 1 and a valve plate 2.

[0053] The base 1 is triangular prism in shape and has a first rectangular surface, a second rectangular surface and a third rectangular surface. The first rectangular surface is the air intake side, the second rectangular surface and the third rectangular surface are located on both sides of the first rectangular surface, the second rectangular surface and the third rectangular surface are the exhaust side, and the second rectangular surface and the third rectangular surface are arranged opposite to each other.

[0054] like Figure 9As shown, the exhaust side is arranged at an angle relative to the intake side. Along the angle of the exhaust side, the exhaust side has at least two exhaust surfaces 11, and exhaust ports 12 are opened on the exhaust surfaces 11. Each exhaust surface 11 is provided with a valve plate 2, which is used to control the opening and closing of the exhaust port of the corresponding exhaust surface 11. Optionally, only one exhaust port 12 can be provided on one exhaust surface 11, and correspondingly, one valve plate 2 can be provided on one exhaust surface 11. Alternatively, at least two exhaust ports 12 can be provided on one exhaust surface 11, and the at least two exhaust ports 12 can be opened and closed by one valve plate 2, or one exhaust port 12 can correspond to one valve plate 2.

[0055] The EGR check valve disclosed in this solution has multiple exhaust surfaces 11 on the exhaust side of the base 1, forming multiple exhaust ports 12 on each exhaust side. Valve plates are installed on the exhaust ports 12. When the exhaust gas pressure is greater than the intake pressure, all valve plates 2 open; when the exhaust gas pressure is less than the intake pressure, all valve plates 2 close. Multiple exhaust surfaces with different inclination angles are provided with corresponding valve plates to accommodate different gas pressures.

[0056] Along the direction of gas flow, the angle between the plane containing at least two exhaust surfaces 11 on the exhaust side and the plane containing the intake side gradually increases, that is, the angle between the plane containing the exhaust surface 11 closer to the intake side and the plane containing the intake side is smaller than the angle between the plane containing the exhaust surface 11 farther from the intake side and the plane containing the intake side.

[0057] Exhaust gas enters through the intake side of the EGR check valve, and valve plate 2 is subjected to force F, such as... Figure 15 As shown, the direction of the force F on valve plate 2 is the same as the direction of exhaust gas entering the intake side, and the force F on valve plate 2 is positively correlated with the exhaust gas pressure. Along the plane of the exhaust port, the exhaust gas pressure is high at the free end of valve plate 2 and low at the fixed end, meaning the force F on the free end of valve plate 2 is greater than the force F on the fixed end. This solution adjusts the angle between the plane of the exhaust surface 11 and the plane of the intake side based on the gas pressure distribution on the exhaust port plane, optimizing the force of exhaust gas acting on valve plate 2, increasing the opening angle of valve plate 2 on different exhaust surfaces 11, reducing exhaust gas resistance, and improving the engine's EGR rate.

[0058] like Figure 15 The diagram shows the force analysis of valve plate 2. The force F on valve plate 2 is decomposed according to the angle of the exhaust surface 11 into a vertical force F1 perpendicular to the exhaust surface 11 and a parallel force F2 parallel to the exhaust surface 11. The parallel force F2 does not participate in the opening action of valve plate 2, while the vertical force F1 does. The larger the vertical force F1, the easier it is for valve plate 2 to deform and open, and the larger the opening angle of valve plate 2. Assuming the angle between the plane containing the exhaust surface 11 and the plane containing the intake side is σ°, according to the Pythagorean theorem, F1 = F * cosσ. The smaller σ is, the larger F1 is.

[0059] Based on the above analysis, the formula for calculating the angle σ between the plane containing the exhaust surface 11 and the plane containing the intake side is as follows: , where F is the resultant force of the exhaust gas pressure and the gravity of valve plate 2.

[0060] Along the arrangement direction perpendicular to at least two exhaust surfaces 11, the exhaust side has at least two rows of exhaust surfaces 11, which further increases the number of exhaust ports 12. The area of ​​the corresponding exhaust ports 12 is reduced, and the area of ​​the valve plate 2 that cooperates with the exhaust port 12 can be reduced, thereby reducing the mass of the valve plate 2 that cooperates with a single exhaust port 12.

[0061] like Figure 11 As shown, this embodiment features two rows of exhaust surfaces 11 on one exhaust side, with each row having three exhaust surfaces 11. For ease of subsequent description, the exhaust surface 11 closer to the intake side is named the low-pressure exhaust surface 11, the exhaust surface 11 farther from the intake side is named the high-pressure exhaust surface 11, and the exhaust surface 11 in the middle is named the medium-pressure exhaust surface 11. The valve plates 2 corresponding to the low-pressure, medium-pressure, and high-pressure regions are named the lower valve plate 2, the middle valve plate 2, and the upper valve plate 2, respectively. The forces borne by the lower valve plate 2, the middle valve plate 2, and the upper valve plate 2 are respectively F. 上 F 中 and F 下 F 上 >F 中 >F 下 The angle between the exhaust surface 11 in the low-pressure zone and the plane containing the intake side is α, the angle between the exhaust surface 11 in the medium-pressure zone and the plane containing the intake side is β, and the angle between the exhaust surface 11 in the high-pressure zone and the plane containing the intake side is θ, where θ > β > α.

[0062] F 上分 = F 上 *cosθ,F 中分 = F 中 *cosβ,F 下分 = F 下 *cosα,F 上分 F 中分 and F 下分 F respectively 上 F 中 and F 下 The component of force along the vertical direction, preferably, is F. 上分 F 中分 and F 下分 When the pressures are equal, the upper valve plate 2, middle valve plate 2, and lower valve plate 2 are subjected to the same opening force under different pressures, and the opening degrees of the upper valve plate 2, middle valve plate 2, and lower valve plate 2 are the same, such as... Figure 16As shown, the opening degree of the traditional ERR check valve is compared with that of the ERR check valve in this solution (the shaded area represents the opening area of ​​the valve plate 2; the design of the base 1 for different tilt angles of the valve plate 2 is not shown here, which makes the difference in the opening area of ​​the two more obvious). The opening area of ​​the EGR check valve disclosed in this solution is significantly increased.

[0063] In related technologies, the valve plate 2 of the EGR check valve opens by the deformation of the valve plate 2. The opening area of ​​the fixed end of the valve plate 2 is relatively small. In this embodiment, the exhaust side of the EGR check valve is designed as a three-step structure, and a single valve plate 2 is optimized into three valve plates 2 according to the three-step structure. By designing the angle between the exhaust surface 11 and the intake side, the valve plate 2 corresponding to the three-step structure actively adapts to different pressure gradients, so that the valve plate 2 can open at the same angle in different pressure areas (especially at low pressure, it can open at a greater angle), thereby increasing the opening area of ​​the EGR check valve, balancing the exhaust pressure, and solving the problem of high exhaust pressure in the low-pressure area of ​​the EGR check valve in related technologies.

[0064] The widths of at least two exhaust surfaces 11 located in the same row along the inclined direction of the exhaust side may be equal or unequal, or the lengths of at least two exhaust surfaces 11 located in the same row may be equal or unequal.

[0065] The shape and dimensions of the valve plate 2 are adapted to the shape and dimensions of the exhaust port 12. When the shapes and dimensions of at least two exhaust surfaces 11 in the same row are different, the shapes and dimensions of the valve plate 2 are also different, and the weights of the valve plate 2 are also different. F is the resultant force of the exhaust gas pressure and the weight of the valve plate 2. The angle design of the exhaust surface 11 needs to take into account the weight of the valve plate 2.

[0066] The exhaust surfaces 11 in different rows are distributed in opposite or staggered positions. That is, along the plane where the exhaust side is located and in the direction of inclination perpendicular to the exhaust side, the exhaust surfaces 11 in different rows are at the same or different heights.

[0067] The exhaust surfaces 11 in different rows are at the same height, that is, multiple rows of exhaust surfaces 11 are formed on the exhaust side. The size of each row of exhaust surfaces 11 can be the same or different.

[0068] The exhaust surfaces 11 of different rows are at different heights. The exhaust surfaces 11, which are staggered along the plane of the exhaust side and in an inclined direction perpendicular to the exhaust side, may have the same or different dimensions.

[0069] like Figures 8-11As shown, this embodiment has two rows of exhaust surfaces 11 on the exhaust side, each row of exhaust surfaces 11 having the same shape, and the exhaust surfaces 11 of different rows having the same height along the gas flow direction. The exhaust port 12 is a rectangular opening. In this embodiment, the different valve plates 2 have the same size and weight, and the different valve plates 2 require the same torque to open, thereby ensuring the same exhaust pressure at each exhaust port 12.

[0070] In this design, the intake side has an intake port 13, which is connected to the exhaust ports 12 on both exhaust sides to improve the pressure uniformity through each exhaust port, reduce the exhaust resistance of each part, and improve the EGR rate of the engine.

[0071] like Figure 12 The angle shown is for reference. The base 1 has a main partition plate in the middle to divide the valve chamber into left and right chambers. The left and right chambers are also equipped with partition plates 14 to separate two adjacent exhaust ports 12. The partition plates 14 are perpendicular to the plane of the air intake side. The partition plates 14 are used to guide the gas flow and reduce the mutual influence of airflow between two adjacent exhaust ports 12.

[0072] Optionally, each partition 14 is flush with the end near the air intake side and is higher than the main partition.

[0073] There are multiple ways to connect the fixed end of the valve plate 2 to the exhaust surface 11.

[0074] In some embodiments, the fixed end of the valve plate 2 is connected to the exhaust surface 11 by a rivet 3. When the exhaust gas pressure is greater than the intake gas pressure, the free end of the valve plate 2 is lifted away from the exhaust surface 11, and the valve plate 2 opens. In this embodiment, because the size of the valve plate 2 is reduced, the valve plate 2 can be made of a material with lower stiffness.

[0075] In some embodiments, the fixed end of the valve plate 2 is hinged to the exhaust surface 11, and the valve plate 2 rotates about the hinge structure. When the exhaust gas pressure is greater than the intake gas pressure, the free end of the valve plate 2 rotates away from the exhaust surface 11, and the valve plate 2 opens. Along a direction perpendicular to the arrangement of at least two exhaust surfaces 11, the exhaust side has at least two rows of exhaust surfaces 11. This embodiment can shorten the length of the hinge shaft connecting the valve plate 2 and the exhaust surface 11, thereby reducing the force gradient on the valve plate when the pressure distribution along the valve plate axis is uneven, and improving the reliability of the valve plate.

[0076] In some embodiments, the fixed end of the valve plate 2 is plugged into the exhaust surface 11. Specifically, the exhaust surface 11 is provided with a slot, and the fixed end of the valve plate 2 is a plate that is inserted into the slot of the exhaust surface 11. When the exhaust gas pressure is greater than the intake pressure, the free end of the valve plate 2 is lifted away from the exhaust surface 11, and the valve plate 2 opens.

[0077] The connection method between the fixed end of the valve plate 2 and the exhaust surface 11 is not limited to the above embodiment, and can also be other connection methods, which are not specifically limited here.

[0078] The valve plate 2 can be a metal plate or a non-metal plate.

[0079] This solution also discloses an EGR system, including an EGR check valve, wherein the EGR check valve is the EGR check valve described in any of the above solutions. Since the EGR check valve has the aforementioned technical effects, the EGR system with this EGR check valve also has the same technical effects, and will not be elaborated further here.

[0080] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An EGR check valve, characterized in that, Includes a base (1) and a valve plate (2). The base (1) has an air intake side and an exhaust side located on both sides of the air intake side. The exhaust side is arranged at an inclination relative to the air intake side. The exhaust side has at least two exhaust surfaces (11) along the inclination direction of the exhaust side. An exhaust port (12) is opened on the exhaust surface (11). A valve plate (2) is provided on each exhaust surface (11). The valve plate (2) is used to open or close the exhaust port (12). The angle between the plane containing at least two of the exhaust surfaces (11) along the gas flow direction and the plane containing the intake side gradually increases.

2. The EGR check valve according to claim 1, characterized in that, Along the arrangement direction perpendicular to the exhaust surface (11), the exhaust side has at least two rows of the exhaust surface (11).

3. The EGR check valve according to claim 2, characterized in that, At least two of the exhaust surfaces (11) in the same row have widths that are equal or unequal along the inclined direction of the exhaust side. Alternatively, at least two of the exhaust surfaces (11) located in the same row may have equal or unequal lengths.

4. The EGR check valve according to claim 2 or 3, characterized in that, The exhaust surfaces (11) of different rows may have the same or different heights along the gas flow direction.

5. The EGR check valve according to claim 1 or 2, characterized in that, The intake side has an intake port (13), which is connected to the exhaust ports (12) of the two exhaust sides.

6. The EGR check valve according to claim 1 or 2, characterized in that, The base (1) has a partition plate (14) for separating two adjacent exhaust ports (12), the partition plate (14) is perpendicular to the plane of the air intake side, and the end of each partition plate (14) is flush with the end of the air intake side.

7. The EGR check valve according to claim 1, characterized in that, The fixed end of the valve plate (2) is connected to the exhaust surface (11) by a rivet (3). The fixed end of the valve plate (2) is the end of the valve plate (2) that is close to the air intake side.

8. The EGR check valve according to claim 1, characterized in that, The fixed end of the valve plate (2) is hinged to the exhaust surface (11), and the fixed end of the valve plate (2) is the end of the valve plate (2) near the intake side.

9. The EGR check valve according to claim 1, characterized in that, The valve plate (2) is a metal plate or a non-metal plate.

10. An EGR system, characterized in that, Includes an EGR check valve, wherein the EGR check valve is the EGR check valve according to any one of claims 1-9.

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