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. A rotating shaft is provided at the fixed end of the valve plate, and a bushing is provided on the base. The valve plate is rotatably connected to the base through the bushing that cooperates with the rotating shaft. The opening of the valve plate of the EGR one-way valve disclosed in this solution is affected by the friction between the rotating shaft and the bushing. The friction between the rotating shaft and the bushing is much smaller than the restoring force generated by the deformation of the valve plate in related technologies, which reduces the opening resistance of the valve plate and increases the opening angle of the valve plate, thereby reducing the exhaust gas resistance and helping to improve the engine EGR rate. By changing the fixing method of the valve plate, the valve plate does not deform during the opening process, and the valve plate does not block the opening area, increasing the opening area at the same opening angle. At the same time, the valve plate does not deform, reducing the risk of the valve plate breaking due to frequent opening and closing, and extending the service life of the valve plate.

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 valve plate 043 of the traditional EGR one-way valve is a cantilever beam structure. The free end of the valve plate 043 is bent and deformed in the direction away from the base 041 relative to the fixed end. After the valve plate 043 is opened, it is arc-shaped as a whole. The opening area of ​​the valve plate 043 is limited, resulting in large exhaust gas resistance and affecting the improvement of engine EGR rate.

[0007] Meanwhile, engine exhaust is a pulse energy wave, while the intake pressure is a constant pressure. The pressure difference between the exhaust pressure and the intake pressure fluctuates, causing valve plate 043 to open and close frequently over a long period of time, resulting in frequent valve plate breakage. Utility Model Content

[0008] This application proposes an EGR one-way valve that can reduce exhaust gas resistance, improve the engine's EGR rate, and solve the problem of frequent valve plate breakage. This application also proposes an EGR system.

[0009] To achieve the above objectives, this application provides an EGR check valve, including a base and a valve plate. A rotating shaft is provided at the fixed end of the valve plate, and the axis of the rotating shaft is coaxial with the rotation axis of the valve plate. A bushing is provided on the base, and the valve plate is rotatably connected to the base via the engagement of the rotating shaft and the bushing.

[0010] The rotating shaft is provided with a limiting component for limiting the opening angle of the valve plate.

[0011] Preferably, in the above-mentioned EGR check valve, the limiting component includes:

[0012] The limiting tooth is connected to the outer wall of the rotating shaft and extends in the radial direction of the rotating shaft;

[0013] A limiting groove is formed on the inner wall of the bushing and along the circumferential direction of the bushing. The limiting groove has a groove wall for abutting against the limiting tooth when the valve plate is opened to a preset angle.

[0014] Preferably, in the above-described EGR check valve, the length of the rotating shaft is greater than the length of the fixed end of the valve plate, and the portion of the rotating shaft extending beyond the valve plate is connected to the bushing.

[0015] The length of the limiting tooth along the axis of the rotating shaft is less than or equal to the length of the rotating shaft along its own axis.

[0016] Preferably, the above-described EGR check valve further includes a sealing assembly for fitting the valve plate against the exhaust side of the base, the sealing assembly sealing the gap between the valve plate and the exhaust side.

[0017] The sealing assembly includes a sealing groove and a sealing protrusion that mates with the sealing groove. The sealing groove is formed on one of the exhaust side and the valve plate, and the sealing protrusion is formed on the other of the exhaust side and the valve plate.

[0018] Preferably, in the above-mentioned EGR check valve, the cross-section of the sealing protrusion is trapezoidal, and the wider lower base of the sealing protrusion is connected to the exhaust side or the valve plate.

[0019] Preferably, in the above-mentioned EGR check valve, the sealing assembly is located on both sides of the valve plate in the opening direction.

[0020] Preferably, the above-mentioned EGR one-way valve further includes an adsorption element, which applies an adsorption force to the valve plate when the valve plate is attached to the exhaust side of the base.

[0021] Preferably, in the above-mentioned EGR one-way valve, the adsorption element is a magnet, and the valve plate is a ferromagnetic metal plate.

[0022] Preferably, in the above-mentioned EGR one-way valve, the adsorption element is located at the free end of the valve plate.

[0023] An EGR system includes an EGR check valve, wherein the EGR check valve is the GR check valve described in any of the above embodiments.

[0024] The EGR check valve provided in this application includes a base and a valve plate. A rotating shaft is provided at the fixed end of the valve plate, and a bushing is provided on the base. The valve plate is rotatably connected to the base via the bushing that mates with the rotating shaft. The opening of the valve plate in this EGR check valve is affected by the friction between the rotating shaft and the bushing, which is much less than the restoring force generated by valve plate deformation in related technologies. This reduces the opening resistance of the valve plate, increases the opening angle of the valve plate, and reduces the exhaust gas resistance, thus contributing to the improvement of the engine's EGR rate. Furthermore, by changing the way the valve plate is fixed, this solution prevents deformation during the opening process, ensuring that the valve plate does not obstruct the opening area. This increases the opening area at the same opening angle, and the absence of deformation reduces the risk of breakage due to frequent opening and closing, extending the valve plate's service life.

[0025] This application 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-mentioned embodiments. 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

[0026] 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.

[0027] Figure 1 This is the schematic diagram of the EGR system;

[0028] Figure 2This is a schematic diagram of the existing EGR check valve closing structure;

[0029] Figure 3 This is a schematic diagram of the existing EGR check valve opening structure;

[0030] Figure 4 This is a schematic diagram of the bottom structure for opening the existing EGR check valve;

[0031] Figure 5 This is a side view of the existing EGR check valve when it is open;

[0032] Figure 6 This is a schematic diagram of the opening area of ​​an existing EGR check valve;

[0033] Figure 7 This is a schematic diagram of the EGR check valve closing structure in this application;

[0034] Figure 8 yes Figure 7 A magnified view of part A in the image;

[0035] Figure 9 This is a schematic diagram of the air inlet with the EGR check valve closed in this application;

[0036] Figure 10 This is a schematic diagram of the structure of the EGR check valve (without valve plate) of this application;

[0037] Figure 11 This is a cross-sectional view of the EGR check valve of this application along the plane containing the exhaust side;

[0038] Figure 12 Figure 10 A magnified view of part I;

[0039] Figure 13 This is a schematic diagram of the sealing assembly of the EGR check valve in this application;

[0040] Figure 14 This is a schematic diagram of the valve plate of the EGR check valve in this application;

[0041] Figure 15 yes Figure 13 A magnified view of part of H;

[0042] Figure 16 This is a schematic diagram of the opening area of ​​the EGR check valve in this application.

[0043] The attached diagram is described below:

[0044] 01-Exhaust manifold; 02-EGR valve; 03-EGR cooler; 04-EGR check valve; 05-EGR aftercooler piping; 06-Intake pipe;

[0045] 041-Base; 042-Air inlet; 043-Valve plate; 044-Exhaust port; 045-Rivet;

[0046] 1-Base; 11-Exhaust port; 2-Valve plate; 3-Rotating shaft; 4-Shaft sleeve; 5-Limiting component; 51-Limiting tooth; 52-Limiting groove; 6-Sealing component; 61-Sealing groove; 62-Sealing protrusion; 7-Adsorption component. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] like Figure 2As shown, the base is generally triangular prism-shaped, with a first rectangular face, a second rectangular face, and a third rectangular face. The first rectangular face is the air intake side of the EGR one-way valve, with an air intake port. The second and third rectangular faces are located on both sides of the first rectangular face and are arranged opposite to each other. The second and third rectangular faces are inclined relative to the first rectangular face. The second and third rectangular faces are the exhaust side of the EGR one-way valve, with an exhaust port. The exhaust port is connected to the air intake port. A valve plate is installed on the exhaust side to open or close the exhaust port.

[0052] The end of the valve plate near the intake side is connected to the base, and the end of the valve plate away from the intake side is not connected to the base and can move away from the base when the exhaust pressure is higher than the intake pressure. 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 not connected to the base as the free end.

[0053] like Figure 3 and Figure 5 As shown, the EGR check valve opens by the deformation of the valve plate, causing the free end of the valve plate to tilt upwards. This creates a gap between the valve plate and the base, forming a waste gas discharge channel. Figure 6 This is a schematic diagram of the opening area of ​​the EGR check valve in related technologies. The shaded area in the diagram represents the opening area. The valve plate is deformed into an arc shape, which will block part of the opening area.

[0054] like Figure 7 As shown, this solution discloses an EGR check valve, including a base 1 and a valve plate 2. A rotating shaft 3 is provided at the fixed end of the valve plate 2, and a bushing 4 is provided on the base 1. The valve plate 2 is rotatably connected to the base 1 via the rotating shaft 3 and the bushing 4. Specifically, the axis of the rotating shaft 3 is coaxial with the rotation axis of the valve plate 2. Along the rotation axis of the valve plate 2, the rotating shaft 3 is provided at the fixed end of the valve plate 2, and the bushing 4 is fixedly connected to the base 1. The bushing 4 is coaxial with the rotating shaft 3 and is sleeved on the rotating shaft 3, thus achieving the connection between the bushing 4 and the rotating shaft 3.

[0055] The valve plate 2 of the EGR check valve disclosed in this solution is rotatably connected to the base 1 via a rotating shaft 3 and a bushing 4. When the exhaust gas pressure is higher than the intake gas pressure, the valve plate 2 moves toward the exhaust side away from the base 1, and the valve plate 2 drives the rotating shaft 3 to rotate within the bushing 4.

[0056] The opening of the valve plate 2 of the EGR one-way valve disclosed in this solution is affected by the friction between the rotating shaft 3 and the bushing 4. The friction between the rotating shaft 3 and the bushing 4 is much smaller than the restoring force generated by the deformation of the valve plate 2 in related technologies, which reduces the opening resistance of the valve plate 2 and increases the opening angle of the valve plate 2, thereby reducing the exhaust gas resistance and helping to improve the engine EGR rate.

[0057] The EGR check valve disclosed in this solution changes the fixing method of valve plate 2, eliminating the problem of valve plate 2 breaking during repeated opening due to stress concentration caused by rivet fixing, and extending the service life of valve plate 2.

[0058] Meanwhile, by changing the fixing method of valve plate 2, this solution ensures that valve plate 2 does not deform during the opening process and does not obstruct the opening area. Figure 16 As shown (the shaded area in the figure represents the opening area of ​​the valve plate), the opening area is increased at the same opening angle.

[0059] In related technologies, in order to ensure that the free end of the valve plate can be raised to increase the exhaust side clearance between the valve plate and the base and ensure the discharge of exhaust gas, the thickness of the valve plate cannot be too thick. At the same time, in order to ensure the opening angle of the valve plate, the stiffness of the valve plate cannot be too large. That is, the larger the opening angle of the valve plate, the smaller the stiffness of the valve plate. However, the thickness and stiffness of the valve plate are directly proportional to the life of the valve plate. That is, the smaller the thickness of the valve plate, the shorter the life of the valve plate, and the smaller the stiffness of the valve plate, the shorter the life of the valve plate.

[0060] In related technologies, valve plates with thinner thickness and lower rigidity are used, leading to frequent valve plate breakage. This solution changes the fixing method of valve plate 2, thereby changing the opening and closing method of valve plate 2. Valve plate 2 rotates around the rotating shaft 3 to open and close without deformation during the opening and closing process. This solution can use materials with greater thickness and / or rigidity to make valve plate 2, thereby increasing the thickness and / or rigidity of valve plate 2 and extending its service life.

[0061] The EGR check valve disclosed in this solution has a valve plate 2 thickness that is 3-5 times thicker than that of a traditional EGR check valve, which improves the rigidity and reliability of the valve plate 2 and extends its service life.

[0062] To prevent the valve plate 2 from failing to return to its original position and engage with the exhaust side when the exhaust pressure is lower than the intake pressure due to an excessively large opening angle, the EGR check valve disclosed in this solution also includes a limiting component 5. The limiting component 5 can limit the opening angle of the valve plate 2, ensuring that the valve plate 2 can close the exhaust port 11.

[0063] In some embodiments, such as Figure 8As shown, the limiting component 5 includes a limiting tooth 51 and a limiting groove 52. The limiting tooth 51 is disposed on the outer wall of the rotating shaft 3 and extends radially along the rotating shaft 3. The limiting groove 52 is formed on the inner wall of the bushing 4 and extends circumferentially along the bushing 4. The limiting groove 52 has a groove wall for the valve plate 2 to abut against the limiting tooth 51 when it is opened to a preset angle. When the valve plate 2 rotates outward away from the exhaust side, it drives the limiting tooth 51 to rotate inward. When the limiting tooth 51 is in contact with the groove wall of the limiting groove 52, the valve plate 2 cannot continue to rotate away from the exhaust side, and the opening angle of the valve plate 2 is at its maximum. The preset angle can be set by those skilled in the art according to actual needs, and is not specifically limited here.

[0064] The limiting groove 52 can also guide the movement of the limiting tooth 51, improving the stability of the valve plate 2 during rotation. Optionally, the limiting groove 52 and the limiting tooth 51 are clearance-fitted along the axial direction of the bushing 4.

[0065] The number of limit components 5 can be one set or multiple sets.

[0066] When there are multiple sets of limiting components 5, the limiting teeth 51 are arranged at equal or non-equal intervals along the circumference of the rotating shaft 3. Correspondingly, the inner wall of the bushing 4 is provided with multiple limiting grooves 52 equal to the number of limiting teeth 51.

[0067] The limiting component 5 can also be a spring (not shown in the figure) disposed between the free end of the valve plate 2 and the exhaust side. Specifically, a mounting groove for mounting the spring is provided on the base 1. One end of the spring is connected to the bottom of the mounting groove, and the other end of the spring is connected to the valve plate 2. When the valve plate 2 is in contact with the exhaust side, the spring is not stretched and does not apply force to the valve plate 2. When the valve plate 2 moves away from the exhaust side, the spring is stretched and applies a pulling force to the valve plate 2. When the pulling force applied by the spring to the valve plate 2 is equal to the force exerted by the gas on the valve plate 2, the valve plate 2 can no longer rotate away from the exhaust side, and the opening angle of the valve plate 2 reaches its maximum.

[0068] The spring can also be replaced by a non-elastic pull rope (not shown in the figure). When the pull rope is pulled to its maximum length, the valve plate 2 can no longer rotate in the direction away from the exhaust side, and the opening angle of the valve plate 2 reaches its maximum.

[0069] The limiting component can also be a support rod (not shown in the figure) set on the base 1. When the valve plate is opened to abut against the support rod, the valve plate can no longer rotate away from the exhaust side, and the opening angle of the valve plate 2 reaches its maximum.

[0070] The limiting component 5 is not limited to the above embodiment, but may be in other forms, which are not specifically limited here.

[0071] The rotating shaft 3 can be set only on both sides of the fixed end of the valve plate 2, or it can be set continuously along the fixed end of the valve plate 2.

[0072] like Figure 7 and Figure 14 As shown, this is an embodiment where the rotating shaft 3 is continuously arranged along the fixed end of the valve plate 2. In this embodiment, the length of the rotating shaft 3 is greater than the length of the fixed end of the valve plate 2, and the portion of the rotating shaft 3 extending beyond the valve plate 2 is connected to the bushing 4. It should be noted that the length of the fixed end of the valve plate 2 is the length of the valve plate 2 along its rotation axis, and the length of the rotating shaft 3 is the length of the rotating shaft 3 along its own axis.

[0073] The longer the shaft 3 is, the higher its strength and the stronger the integrity of the shaft 3 and the valve plate 2, thus improving the reliability of the connection between the valve plate 2 and the base 1.

[0074] Optionally, the length of the limiting tooth 51 along the axis of the rotating shaft 3 is equal to the length of the rotating shaft 3 along its own axis. On the one hand, the limiting tooth 51 can enhance the strength of the rotating shaft 3 to a certain extent; on the other hand, as... Figure 8 As shown, the valve plate 2 is in contact with the exhaust side of the base 1. In this design, the bushing 4 protrudes from the exhaust side of the base 1, providing space for the limiting tooth 51 to rotate with the valve plate 2. When the valve plate 2 is open, the free end of the valve plate 2 rotates away from the exhaust side of the base 1, and the rotating shaft 3 drives the limiting tooth 51 to rotate towards the exhaust side of the base 1. Optionally, when the valve plate 2 is opened to its maximum angle, the limiting tooth 51 abuts against the exhaust side of the base 1, improving the reliability of the limiting component 5.

[0075] In some embodiments, the length of the limiting tooth 51 is less than the length of the rotating shaft 3, and the limiting tooth 51 is discontinuously distributed along the axial direction of the rotating shaft 3.

[0076] As the engine runs longer, carbon soot and oily substances in the EGR exhaust gas will adhere to the exhaust side of valve plate 2 and base 1. This results in a gap between valve plate 2 and exhaust side even when valve plate 2 is in contact with the exhaust side. The gap will increase as carbon soot and oily substances accumulate, eventually causing valve plate 2 to fail to close and gradually increasing the emission risk.

[0077] The EGR check valve disclosed in this solution also includes a sealing assembly 6 for fitting the valve plate 2 and the base 1 on the exhaust side, and the sealing assembly 6 seals the gap between the valve plate 2 and the base 1 on the exhaust side.

[0078] In some embodiments, the sealing assembly 6 includes a sealing groove 61 and a sealing protrusion 62, wherein when the sealing groove 61 and the sealing protrusion 62 are in sealing engagement, the sealing protrusion 62 is inserted into the sealing groove 61.

[0079] Specifically, the sealing groove 61 is formed on one of the exhaust sides of the valve plate 2 and the base 1, and the sealing protrusion 62 is provided on the other of the exhaust sides of the valve plate 2 and the base 1. When the valve plate 2 and the exhaust side of the base 1 are in contact, the sealing protrusion 62 is inserted into the sealing groove to seal the gap between the exhaust side of the valve plate 2 and the base 1.

[0080] like Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown, this is an embodiment in which a sealing protrusion 62 is provided on the valve plate 2 and a sealing groove is provided on the base 1. The sealing protrusion 62 moves with the valve plate 2 and may or may not engage with the sealing groove of the base 1.

[0081] In some embodiments, sealing protrusions 62 are provided on both sides of the valve plate 2 in its opening and closing direction, and the sealing groove on the base 1 is opposite to the sealing protrusions 62.

[0082] The sealing protrusion 62 and the base 1 or valve plate 2 can be an integral structure. In this embodiment, the sealing protrusion 62 and the base 1 or valve plate 2 are made of the same material.

[0083] The sealing protrusion 62 and the base 1 or valve plate 2 can be separate structures. In this embodiment, the sealing protrusion 62 can be a rubber protrusion, which is fixedly connected to the base 1 or valve plate 2.

[0084] The lengths of the sealing protrusion 62 and the sealing groove 61 can be set long enough to enhance the sealing effect.

[0085] In some embodiments, the sealing protrusion 62 has a trapezoidal cross-section perpendicular to its length direction. The wider lower base of the trapezoid is connected to the valve plate 2 or the base 1, while the narrower upper base is a free end. The length direction of the sealing protrusion 62 is parallel to the rotation axis of the valve plate 2.

[0086] The shape of the sealing groove can be adapted to the shape of the sealing protrusion 62, or it can be a cuboid shape adapted to the shape of the bottom of the sealing protrusion 62.

[0087] The EGR one-way valve can only prevent intake backflow. Even when the exhaust pressure and exhaust pressure are very low, valve plate 2 will open. When the engine requires an EGR rate of 0, the leakage of the EGR one-way valve cannot reach 0, and there is a risk of exhaust gas leaking into the intake system.

[0088] The EGR one-way valve disclosed in this solution also includes an adsorption element 7, which is used to adhere to the exhaust side of the valve plate 2 and the base 1. The adsorption element 7 applies an adsorption force to the valve plate 2 to prevent the valve plate 2 from opening when the exhaust gas pressure and exhaust pressure are very small. This ensures that when the engine's required EGR rate is 0, the leakage of the EGR one-way valve is close to 0, reducing the risk of exhaust gas leaking into the intake system.

[0089] When the engine is in EGR mode, the pressure difference between the exhaust gas pressure and the exhaust pressure is greater than the adsorption force of the adsorption component 7 on the valve plate 2, and the valve plate 2 opens under the action of the pressure difference between the exhaust gas pressure and the exhaust pressure.

[0090] The adsorption element 7 can effectively prevent the valve plate 2 from opening when the exhaust gas pressure and the exhaust pressure are very low, reduce the opening and closing frequency of the valve plate 2, and can protect the valve plate 2 to a certain extent, reducing the risk of valve plate 2 breakage.

[0091] In some embodiments, such as Figure 10 As shown, the adsorption element 7 is disposed at the free end of the valve plate 2.

[0092] The free end of valve plate 2 bears the greatest gas pressure. Placing the adsorption element 7 at the free end of valve plate 2 ensures the reliability of valve plate 2 opening.

[0093] The adsorption element 7 is not limited to being located at the free end of the valve plate 2, but can also be located on both sides of the valve plate 2 in the opening and closing direction. The base 1 located on both sides of the valve plate 2 in the opening and closing direction can simultaneously house the sealing assembly 6 and the adsorption element 7.

[0094] In some embodiments, the adsorption element 7 is a magnet, and correspondingly, the valve plate 2 is a ferromagnetic metal plate.

[0095] In some embodiments, the adsorption element 7 may also be a suction cup.

[0096] This application 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 embodiments.

[0097] Since the EGR check valve has the above-mentioned technical effects, the EGR system with the EGR check valve also has the same technical effects, which will not be elaborated here.

[0098] 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 by, The system includes a base (1) and a valve plate (2). The fixed end of the valve plate (2) is provided with a rotating shaft (3). The axis of the rotating shaft (3) is coaxial with the rotation axis of the valve plate (2) when it opens and closes. The base (1) is provided with a bushing (4). The valve plate (2) is rotatably connected to the base (1) through the cooperation of the rotating shaft (3) and the bushing (4). The rotating shaft (3) is provided with a limiting component (5) for limiting the opening angle of the valve plate (2).

2. The EGR check valve of claim 1, wherein The limiting component (5) includes: The limiting tooth (51) is connected to the outer wall of the rotating shaft (3) and extends in the radial direction of the rotating shaft (3); A limiting groove (52) is formed on the inner wall of the bushing (4) and along the circumferential direction of the bushing (4). The limiting groove (52) has a groove wall for abutting the limiting tooth (51) when the valve plate is opened to a preset angle.

3. The EGR check valve of claim 2, wherein, The length of the rotating shaft (3) is greater than the length of the fixed end of the valve plate (2), and the portion of the rotating shaft (3) extending beyond the valve plate (2) is connected to the bushing (4). The length of the limiting tooth (51) along the axis of the rotating shaft (3) is equal to the length of the rotating shaft (3) along its own axis.

4. The EGR check valve of claim 1, wherein It also includes a sealing assembly (6) for fitting the valve plate (2) against the exhaust side of the base (1), the sealing assembly (6) sealing the gap between the valve plate (2) and the exhaust side. The sealing assembly (6) includes a sealing groove (61) and a sealing protrusion (62) that mates with the sealing groove (61). The sealing groove (61) is formed on one of the exhaust side and the valve plate (2), and the sealing protrusion (62) is formed on the other of the exhaust side and the valve plate (2).

5. The EGR check valve according to claim 4, characterized in that, The sealing protrusion (62) has a trapezoidal cross-section, and the wider lower base of the sealing protrusion (62) is connected to the exhaust side or the valve plate (2).

6. The EGR check valve according to claim 4, characterized in that, The sealing assembly (6) is located on both sides of the valve plate (2) in the opening direction.

7. The EGR check valve according to any one of claims 1-6, characterized in that, It also includes an adsorption element (7) for applying an adsorption force to the valve plate (2) when the valve plate (2) is attached to the exhaust side of the base (1).

8. The EGR check valve according to claim 7, characterized in that, The adsorption element (7) is a magnet, and the valve plate (2) is a ferromagnetic metal plate.

9. The EGR check valve according to claim 7, characterized in that, The adsorption element (7) is located at the free end of the valve plate (2).

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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