One-way valve, EGR system and engine

Abstract

The present application discloses a one-way valve, an EGR system, and an engine, comprising a one-way valve body, the one-way valve body comprising at least one valve body portion, the valve body portion being provided with an airflow channel for communicating with a controlled pipeline, the airflow channel having an airflow inlet at one end and an airflow outlet at the other end; the airflow outlet being provided with at least two one-way valve discs, each of which is rotatably engaged with the valve body portion, and the free end of each one-way valve disc being connected to the valve body portion via a reset member; the at least two one-way valve discs being arranged in different pressure regions of the airflow outlet, and the opening resistance of the one-way valve disc corresponding to the region with higher outlet pressure being greater than the opening resistance of the one-way valve disc corresponding to the region with lower outlet pressure. The present application can set a larger one-way valve opening as required, thereby reducing the outlet resistance of the EGR exhaust gas, and can achieve a similar opening angle of the one-way valve discs in different gas pressure regions, thereby ensuring a balanced outlet pressure of the EGR exhaust gas.

Description

Technical Field

[0001] The present application relates to the technical field of engines, and more particularly to a one-way valve, an EGR system and an engine. Background Art

[0002] To reduce NO X In order to improve the original emission level of the engine, the engine is usually equipped with an EGR (Exhaust Gas Re-circulation) system. The EGR system will lead part of the engine's exhaust gas back into the cylinder and mix it with the engine's fresh intake air to improve engine efficiency, improve the combustion environment, reduce engine load, reduce NOx emissions, reduce knock, and extend the service life of various components.

[0003] To prevent intake air from flowing back into the EGR system when the engine's intake pressure is greater than the exhaust pressure, a check valve is typically added after the EGR cooler in the EGR system. This check valve prevents the engine's intake air from flowing back through the pipes into the EGR cooler, EGR valve, and other internal components when the intake pressure is greater than the exhaust pressure, potentially reducing intake pressure and engine performance.

[0004] The EGR system's check valve includes a valve disc. When exhaust gas pressure exceeds intake pressure, the valve disc opens; when exhaust gas pressure falls below intake pressure, the valve disc closes. In conventional systems, one end of the valve disc is fixed to the valve body of the check valve using fasteners such as rivets. The opening and closing of conventional check valves are based on the pressure differential across the check valve. When the pressure upstream of the check valve is high, the free end of the valve disc deforms and springs upward. The height of this spring is related not only to the magnitude of the pressure differential but also to the elastic deformation capacity of the valve disc's own material. In other words, the opening of the check valve is inversely proportional to the stiffness of the valve disc material. The stiffness of the valve disc material is also directly proportional to its lifespan. Therefore, to ensure the lifespan of the valve disc, a certain stiffness is typically required. This affects the amount of deformation of the valve disc, preventing it from opening too wide. This results in high EGR exhaust gas outlet resistance and makes it difficult to increase the engine's EGR rate.

[0005] Therefore, how to increase the opening of the one-way valve without affecting its service life is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the object of this application is to provide a one-way valve to increase the opening of the one-way valve without affecting the service life;

[0007] Another object of the present application is to provide an EGR system and an engine having the one-way valve.

[0008] To achieve the above objectives, this application provides the following technical solutions:

[0009] A first aspect of the present application provides a one-way valve for sealingly communicating with a controlled pipeline, comprising a one-way valve body, the one-way valve body comprising at least one valve body portion, the valve body portion being provided with an air flow channel for communicating with the controlled pipeline, one end of the air flow channel being an air flow inlet, and the other end being an air flow outlet;

[0010] The air flow outlet is provided with at least two one-way valve discs, each of which is rotatably fitted on the valve body, and the free end of each one-way valve disc is connected to the valve body via a reset member, at least two of the one-way valve discs are arranged in different pressure areas of the air flow outlet, and the opening resistance of the one-way valve disc corresponding to the area with high outlet pressure is greater than the opening resistance of the one-way valve disc corresponding to the area with low outlet pressure.

[0011] In a possible implementation, each of the air flow outlets is provided with two one-way valve discs, namely a first valve disc and a second valve disc, and the rotation centers of the first valve disc and the second valve disc are coaxially arranged.

[0012] In one possible implementation, the hinged end of the first valve disc is provided with a first hinge shaft, and the hinged end of the second valve disc is provided with a second hinge shaft. The first hinge shaft and the second hinge shaft are nested and rotatably supported on the support portion on the valve body.

[0013] In a possible implementation, one of the first hinge shaft and the second hinge shaft is a central shaft, and the other is a tubular shaft, and the tubular shaft is sleeved outside the central shaft;

[0014] The support portion is provided with a central hole matched with the central axis, and an annular hole matched with the axis of the tube body.

[0015] In a possible implementation, the length of the central axis is W1a, the length of the tube body axis is W2a, and W1a≤W2a.

[0016] In a possible implementation, the length of the first hinge shaft is W1a, the dimension of the first valve plate along the axial direction of the first hinge shaft is W1, and then (W1a-W1) / W1=0.3-0.4;

[0017] and / or,

[0018] The length of the second hinge shaft is W2a, and the dimension of the second valve plate along the axial direction of the second hinge shaft is W2, then (W2a-W2) / W2=0.3-0.4.

[0019] In a possible implementation, the first hinge axis is a central axis, and the second hinge axis is a tube axis;

[0020] The tube shaft has a circumferentially circumferentially circumferentially circumferentially circumferentially circumferentially circumferentially circumferentially circumferentially to ... avoid the first valve disc. The circumferentially circumferentially circumferentially circumferentially circumferentially circumferentially extends from one end of the tube shaft to the other end. The central angle of the annular hole is greater than the central angle of the tube shaft.

[0021] In a possible implementation, a central angle of the annular hole is smaller than 360°.

[0022] In a possible implementation, the rotation centers of the first valve disc and the second valve disc are located in a central area of ​​the air flow outlet.

[0023] In a possible implementation, the first valve plate is closer to the middle area in the airflow direction than the second valve plate;

[0024] The coverage area of ​​the first valve sheet is greater than the coverage area of ​​the second valve sheet, and / or the weight of the first valve sheet is greater than the weight of the second valve sheet.

[0025] In a possible implementation, the thickness of the first valve plate is A, the thickness of the second valve plate is B, the dimension of the first valve plate along the arrangement direction of the first valve plate and the second valve plate is L1, and the dimension of the second valve plate along the arrangement direction of the first valve plate and the second valve plate is L2;

[0026] Then B=(0.8-0.9)A, L2=(0.3-0.4)L1.

[0027] In a possible implementation, there are a plurality of valve body portions arranged along the first direction, and the air flow inlets of the valve body portions are connected or separated.

[0028] In a possible implementation, the airflow outlets are provided on both sides of the valve body along the second direction, the first direction is perpendicular to the second direction, and the airflow outlets on both sides of the valve body are connected to the airflow inlet of the valve body.

[0029] In a possible implementation, the airflow direction at the airflow inlet and the airflow direction at the airflow outlet form an obtuse angle.

[0030] In one possible implementation, the reset member is a door closer, a valve disc connecting portion is provided on the one-way valve disc, a valve body connecting portion is provided on the valve body portion, one end of the door closer is connected to the valve disc connecting portion, and the other end is connected to the valve body connecting portion.

[0031] In a possible implementation, the thickness of the one-way valve disc is 0.9 mm-3 mm.

[0032] The one-way valve provided in the present application rotates the one-way valve disc to fit on the valve body, and connects a reset member between the free end of the one-way valve disc and the valve body to maintain the closed state of the one-way valve disc. When the pressure difference before and after the one-way valve disc is able to push the one-way valve disc to overcome the reset force of the reset member, it will push the one-way valve disc to swing, thereby opening the airflow channel, so that the airflow can flow in a specific direction in the controlled pipeline through the airflow channel. When the pressure difference before and after the one-way valve disc cannot overcome the reset force of the reset member, the one-way valve disc will be pulled back by the reset force to close the airflow channel, thereby preventing the airflow from flowing in the opposite direction of the specific direction.

[0033] The present application does not require the use of rivets to fix the one-way valve disc, thereby eliminating the stress concentration on the one-way valve disc caused by rivets and avoiding the problem of the one-way valve disc breaking during repeated opening. The present application changes the structure of the traditional one-way valve that must rely on the elastic deformation of the one-way valve disc itself to open. The present application does not rely on the deformation of the one-way valve disc to achieve opening and closing. Therefore, the thickness of the one-way valve disc can be increased according to demand, ensuring that the one-way valve disc has greater rigidity, thereby ensuring the service life of the one-way valve disc. Moreover, it does not rely on the elastic deformation of the one-way valve disc to control the opening of the one-way valve. Therefore, a larger one-way valve opening can be set according to demand, reducing the exhaust resistance of the EGR exhaust gas. The friction resistance generated by the rotation of the one-way valve disc is much smaller than the energy loss caused by the deformation of the one-way valve disc, which is also beneficial to reducing the EGR exhaust resistance and improving the engine EGR rate.

[0034] This application provides at least two one-way valve discs for each airflow outlet. Compared to a single one-way valve disc, this application provides a larger opening area at the same opening angle, which helps reduce EGR exhaust gas resistance and improves the engine's EGR rate capability. Furthermore, the at least two one-way valve discs are arranged in different pressure regions of the airflow outlet, and the opening resistance of the one-way valve disc corresponding to the region with higher outlet pressure is greater than the opening resistance of the one-way valve disc corresponding to the region with lower outlet pressure. This ensures that the opening angles of the one-way valve discs in different gas pressure regions are consistent, ensuring balanced EGR exhaust gas outlet pressure.

[0035] Each one-way valve disc of the present application is connected to a reset component, and the reset force of the reset component can ensure that the EGR valve leakage gas will not flow into the intake side, meeting the engine emission requirements while avoiding the problem of the one-way valve disc repeatedly opening and closing, which causes the one-way valve disc to slap the valve body.

[0036] A second aspect of the present application provides an EGR system, comprising an EGR pipe, wherein one end of the EGR pipe is an exhaust side connection end, and the other end is an intake side connection end;

[0037] In the direction from the exhaust side connection end to the intake side connection end, the EGR pipeline is connected in series with at least an EGR valve and a one-way valve as described in any one of the above items.

[0038] The EGR system provided in this application has all the technical effects of the above-mentioned one-way valve, and will not be described in detail herein.

[0039] A third aspect of the present application provides an engine comprising the EGR system as described above.

[0040] The engine provided in this application has all the technical effects of the above-mentioned EGR system because it has the above-mentioned EGR system, which will not be described in detail in this article. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] Figure 1 It is a structural schematic diagram of a one-way valve in the prior art at a certain angle;

[0043] Figure 2 It is a structural schematic diagram of a one-way valve in the prior art at another angle;

[0044] Figure 3 It is a structural schematic diagram of a one-way valve in the prior art when it is in a closed state;

[0045] Figure 4 It is a front view of a one-way valve in the prior art when it is in an open state;

[0046] Figure 5 This is a schematic structural diagram of the one-way valve disclosed in an embodiment of the present application when it is in a closed state;

[0047] Figure 6 This is a schematic structural diagram of the exhaust side of the one-way valve disclosed in an embodiment of the present application;

[0048] Figure 7 This is a structural diagram of the one-way valve disclosed in the embodiment of the present application when it is in an open state;

[0049] Figure 8 A front view of a one-way valve disclosed in an embodiment of the present application;

[0050] Figure 9 A simulation diagram of the pressure distribution of the fluid in the pipeline disclosed in the embodiment of this application;

[0051] Figure 10 A simulation diagram of the pressure distribution of the fluid in the one-way valve disclosed in the embodiment of the present application;

[0052] Figure 11 This is a schematic structural diagram of the first valve plate disclosed in an embodiment of the present application;

[0053] Figure 12 A front view of the first valve plate disclosed in an embodiment of the present application;

[0054] Figure 13 This is a schematic structural diagram of the second valve plate disclosed in an embodiment of the present application;

[0055] Figure 14 A front view of the second valve plate disclosed in an embodiment of the present application;

[0056] Figure 15 A partial enlarged view of the support portion disclosed in an embodiment of the present application;

[0057] Figure 16 This is a partial enlarged view of the hinge shaft disclosed in the embodiment of the present application installed on the support portion;

[0058] Figure 17 This is a partial enlarged view of the one-way valve disc disclosed in the embodiment of the present application when it is in a closed state;

[0059] Figure 18 This is a partial enlarged view of the one-way valve disc disclosed in the embodiment of the present application when it is in an open state;

[0060] Figure 19 A cross-sectional view of a one-way valve disclosed in an embodiment of the present application;

[0061] Figure 20 A comparison diagram of the opening area of ​​the one-way valve disc disclosed in the embodiment of this application;

[0062] Figure 21 This is a schematic diagram of the gas circuit of the engine disclosed in the embodiment of this application.

[0063] The meanings of the reference numerals in the figures are as follows:

[0064] 1-valve body; 2-airflow outlet; 3-valve plate; 4-rivet; 5-seal; 6-airflow inlet; 7-exhaust outlet;

[0065] 01-Engine body; 02-EGR valve; 03-Check valve; 04-EGR cooler;

[0066] 100 - one-way valve body; 101 - air flow inlet; 102 - air flow outlet; 110 - valve body;

[0067] 200 - first valve disc; 201 - first valve disc connecting portion; 202 - first hinge shaft;

[0068] 300-support part; 301-isolator; 302-center hole; 303-annular hole;

[0069] 400 - second valve disc; 401 - second valve disc connection portion; 402 - second hinge shaft; 4021 - avoidance opening;

[0070] 500-seals;

[0071] 600-Reset piece. DETAILED DESCRIPTION

[0072] The embodiment of the present application discloses a one-way valve, which can increase the opening of the one-way valve without affecting the service life;

[0073] The embodiments of the present application also disclose an EGR system and an engine having the above-mentioned one-way valve.

[0074] The following describes the embodiments with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the content of the application described in the claims. Furthermore, the entire contents of the configurations represented by the following embodiments are not limited to those necessary for the solution of the application described in the claims. It should be noted that, for ease of description, only the portions related to the relevant application are shown in the accompanying drawings. The embodiments and features in the embodiments of this application may be combined with each other unless there is a conflict.

[0075] like Figure 1 and Figure 2 As shown, currently, a one-way valve used in an EGR system generally includes a valve body 1 and a valve plate 3. The valve body 1 is provided with a seal 5. The valve body 1 is provided with an air flow channel, one end of the air flow channel is an air flow inlet 6, and the other end is an air flow outlet 2. The air flow inlet 6 is connected to the exhaust side of the engine, and the air flow outlet 2 is connected to the intake side of the engine.

[0076] One end of the valve plate 3 is fixed to the valve body 1 by a rivet 4, and the valve plate 3 has a certain elasticity, so that the valve plate 3 can open and close the air flow channel. Normally, the valve plate 3 covers one side of the air flow outlet 2. When the exhaust pressure is higher than the intake pressure, the valve plate is in the open state, such as Figure 1 When the exhaust pressure (the pressure on the exhaust side of the engine, i.e. the pressure at the air inlet 6) is lower than the intake pressure (the pressure on the intake side of the engine, i.e. the pressure at the air outlet 2), the valve plate 3 is in the closed state, as shown in FIG. Figure 3 shown.

[0077] like Figure 4As shown, the opening of the one-way valve is inversely proportional to the stiffness of the valve plate 3. The larger the opening, the larger the exhaust gas outlet 7 formed between the valve plate 3 and the valve body 1. The stiffness of the valve plate 3 material is proportional to the life of the valve plate 3. Therefore, in order to ensure the service life of the valve plate 3, the valve plate 3 is usually required to have a certain stiffness, which will inevitably affect the opening angle of the valve plate 3, resulting in large EGR exhaust gas outlet resistance and difficulty in increasing the engine EGR rate.

[0078] After studying traditional one-way valves, the inventors discovered that the valve disc 3 of traditional one-way valves has a high reliability risk and is prone to breakage. Engine exhaust is a pulsed energy wave, while intake pressure is a steady pressure, and the pressure differential between the two fluctuates. Furthermore, because EGR valve leakage cannot reach zero, the pressure differential across the valve disc 3 of the one-way valve is a continuously fluctuating energy source. This fluctuating pressure differential can cause the valve disc 3 of the one-way valve to open and close frequently and over a long period of time.

[0079] One end of the valve disc 3 is fixed to the valve body 1 by a rivet 4, which is a cantilever beam structure. When it needs to be opened, the valve disc 3 deforms, and the free end away from the fixed end will tilt up, thereby increasing the gap between the valve disc 3 and the valve body 1 to ensure gas outflow. In order to achieve deformation, the valve disc cannot increase its rigidity by increasing its thickness. As mentioned above, due to the frequent opening and closing of the valve disc 3 of the one-way valve, the valve disc 3 will frequently contact the valve body 1, and the low rigidity of the valve disc 3 will cause the valve disc 3 to frequently break.

[0080] The inventors also discovered that when the engine's required EGR rate is zero, but the EGR valve's leakage cannot reach zero, there is a risk of EGR exhaust gas leaking into the intake system. Because the one-way valve only prevents intake air from flowing back, even under very small pressure differential conditions, it cannot prevent leaked EGR exhaust from flowing out, leading to high engine emissions. This problem is exacerbated by the increasing EGR valve clearance as the engine runs longer. Furthermore, the one-way valve's valve plate 3 also deforms with increasing operating time, further increasing the emission risk.

[0081] In view of this, the embodiments of the present application disclose a one-way valve to overcome the above-mentioned defects discovered by the inventors through research.

[0082] like Figure 5-Figure 7As shown, the one-way valve disclosed in the embodiment of the present application is used to seal and connect to the controlled pipeline to achieve one-way conduction of the controlled pipeline, that is, conduction can only be achieved in a specific direction, and it is in a cut-off state in the direction opposite to the specific direction. The one-way valve can be applied to the EGR system, that is, as a one-way valve of the EGR system, the controlled pipeline is the EGR pipeline of the EGR system. It should be noted that the one-way valve disclosed in this embodiment can also be applied to other fields and is not limited to the specific field of the EGR system. For ease of understanding, the following text will take the application of the one-way valve in the EGR system as an example for introduction.

[0083] The one-way valve disclosed in this embodiment includes a one-way valve body 100, which is the main supporting component of the one-way valve and is used to provide an installation base for components such as the one-way valve disc. A corresponding seal 500 can be provided on the outside of the one-way valve body 100 to seal with the installation location of the one-way valve. In this embodiment, a valve body frame can be provided on the outside of the one-way valve body 100, and a seal 500 can be provided on the valve body frame to improve the sealing effect. When the one-way valve is installed in the installation location of the EGR system, the seal 500 seals with the inner wall of the installation location.

[0084] The one-way valve body 100 includes at least one valve body portion 110, which defines an airflow channel for communicating with a controlled pipeline. One end of the airflow channel is an airflow inlet 101, and the other end is an airflow outlet 102. The airflow inlet 101 is used to communicate with the exhaust side of the engine, and the airflow outlet 102 is used to communicate with the intake side of the engine.

[0085] The airflow outlet 102 is provided with at least two one-way valve discs, each of which is rotatably engaged with the valve body 110. In this embodiment, the airflow outlet 102 can be opened and closed by the rotational engagement of the one-way valve discs with the valve body 110. As the one-way valve discs rotate along their rotational centers, their relative positional relationship with the airflow outlet 102 can change. When all the one-way valve discs block the airflow outlet 102, the one-way valves are in a closed state, preventing reverse flow of fluid along the controlled pipeline. When the one-way valve discs leave the airflow outlet 102, the one-way valves are in an open state, allowing fluid to pass through the one-way valves from the airflow channel, maintaining the one-way conduction state of the controlled pipeline.

[0086] The free end of each one-way valve disc is connected to the valve body 110 via a reset member 600. Specifically, one end of the reset member 600 is connected to the free end of the one-way valve disc, and the other end is connected to the valve body 110. The elastic force of the reset member 600 exerts a pulling force on the free end of the one-way valve disc, causing the one-way valve disc to close the airflow outlet 102, keeping the one-way valve in a closed state.

[0087] The number of one-way valve discs corresponding to each air flow outlet 102 can be two or more than two. This embodiment does not limit the specific number of one-way valve discs. As long as the air flow outlet 102 can be completely closed, technical personnel in this field can select the number of one-way valve discs corresponding to each air flow outlet 102 according to actual needs.

[0088] like Figure 9 As shown in the figure, according to gas dynamics, when gas moves in the pipeline, the gas along the pipe wall will be affected by the friction resistance of the pipe wall and the friction between gases. Therefore, the pressure distribution of the gas in the pipeline shows a trend of radiating from the center to the surrounding area, that is, the central area of ​​the pipeline is a high-pressure area, and the pipe wall area is a low-pressure area (red is a high-pressure area, blue and green are low-pressure areas). The pressure distribution is shown in the figure. Figure 5 shown.

[0089] The pressure distribution of gas in the one-way valve is as follows Figure 10 As shown, the pressure at the air inlet 101 is relatively uniform, but the pressure at the air outlet 102 is uneven. The upper area of ​​the air outlet 102 is a high-pressure area, and the lower area is a low-pressure area.

[0090] After research, the inventor found that if the opening resistance of each one-way valve disc at the airflow outlet 102 is the same, the opening angle of the one-way valve disc corresponding to the high-pressure area of ​​the airflow outlet 102 will be large, while the opening angle of the one-way valve disc corresponding to the low-pressure area of ​​the airflow outlet 102 will be small, which will cause the air outlet 102 to be unbalanced.

[0091] like Figure 19 As shown, based on this, in this embodiment, at least two one-way valve discs are arranged in different pressure areas of the airflow outlet 102. Furthermore, the opening resistance of the one-way valve disc corresponding to the area with higher outlet pressure is greater than the opening resistance of the one-way valve disc corresponding to the area with lower outlet pressure. It should be noted that the area with higher outlet pressure (the area corresponding to the rectangular dashed box) and the area with lower outlet pressure (the area corresponding to the elliptical dashed box) are in a relative pressure relationship, that is, when compared, one has a higher pressure than the other. Taking two one-way valve discs as an example, for ease of understanding, the two one-way valve discs are defined as the first valve disc 200 and the second valve disc 400, respectively.

[0092] If the outlet pressure corresponding to the area where the first valve disc 200 is set is greater than the outlet pressure corresponding to the area where the second valve disc 400 is set, the opening resistance of the first valve disc 200 needs to be designed to be greater than the opening resistance of the second valve disc 400. This ensures that the area with high pressure is equipped with a one-way valve disc with high opening resistance, while the area with low pressure is equipped with a one-way valve disc with low opening resistance. The high-pressure gas in the high-pressure area generates a greater opening thrust on the one-way valve disc, while the low-pressure gas in the low-pressure area generates a smaller opening thrust on the one-way valve disc. Furthermore, since the one-way valve disc in the high-pressure area has a greater opening resistance, while the one-way valve disc in the low-pressure area has a smaller opening resistance, the opening angles of the one-way valve discs in different gas pressure areas can be made equal, achieving the purpose of pressure balance at the airflow outlet 102.

[0093] The one-way valve disclosed in the embodiment of the present application rotates the one-way valve disc to fit on the valve body 110, and connects the reset member 600 between the free end of the one-way valve disc and the valve body 110 to maintain the closed state of the one-way valve disc. When the pressure difference before and after the one-way valve disc is able to push the one-way valve disc to overcome the reset force of the reset member 600, it will push the one-way valve disc to swing to open the airflow channel, so that the airflow can flow in a specific direction in the controlled pipeline through the airflow channel. When the pressure difference before and after the one-way valve disc cannot overcome the reset force of the reset member 600, the one-way valve disc will be pulled back by the reset force to close the airflow channel and prevent the airflow from flowing in the opposite direction of the specific direction.

[0094] The present invention eliminates the need for rivets to secure the one-way valve disc, thereby eliminating stress concentration on the disc caused by rivets and preventing the disc from breaking during repeated opening. This invention changes the traditional one-way valve structure, which relies on the disc's own elastic deformation for opening. This invention does not rely on the disc's deformation to achieve opening and closing. Therefore, the thickness of the disc can be increased as needed (the disc's thickness can be designed to be 0.9 mm to 3 mm, meaning the disc's thickness in this embodiment can be designed to be 3 to 6 times the thickness of a conventional disc). This ensures greater rigidity and, in turn, a longer service life. Furthermore, since the disc's opening is controlled independently of its elastic deformation, a wider opening can be set as needed, reducing exhaust resistance to EGR (Exhaust Gas Reduction) (EGR). The frictional resistance generated by the disc's rotation is significantly less than the energy loss caused by its deformation, thus reducing EGR resistance and increasing the engine's EGR rate.

[0095] like Figure 20 As shown, the present application sets at least two one-way valve plates for each air flow outlet (such as Figure 20 b in), compared with a single one-way valve disc (such as Figure 20(a) At the same opening angle, the present invention has a larger opening area (opening area b1 + b2 > opening area a), which helps reduce EGR exhaust resistance and improves the engine's EGR rate capability. Furthermore, at least two one-way valve discs are arranged in different pressure regions of the airflow outlet, and the opening resistance of the one-way valve disc corresponding to the region with higher outlet pressure is greater than the opening resistance of the one-way valve disc corresponding to the region with lower outlet pressure. This ensures that the opening angles of the one-way valve discs in different gas pressure regions are consistent, ensuring balanced EGR exhaust outlet pressure.

[0096] Each one-way valve disc of the present application is connected to a reset member 600. The reset force of the reset member 600 can ensure that the EGR valve leakage gas will not flow into the intake side, meeting the engine emission requirements while avoiding the problem of the one-way valve disc repeatedly opening and closing, which causes the one-way valve disc to slap the valve body 110.

[0097] In one embodiment of the present application, each airflow outlet 102 is provided with two one-way valve discs, namely a first valve disc 200 and a second valve disc 400. The rotation centers of the first valve disc 200 and the second valve disc 400 are coaxially arranged. The rotation centers of the first valve disc 200 and the second valve disc 400 can be coaxial by nesting each other. This allows the restraining ends of the first valve disc 200 and the second valve disc 400 to be located at the same position, while the free ends are located at the two ends of the airflow outlet 102.

[0098] Of course, the rotation centers of the first valve disc 200 and the second valve disc 400 may also be located at the two ends of the airflow outlet 102, so that the free ends of the first valve disc 200 and the second valve disc 400 are located close to the first valve disc 200 and the second valve disc 400. This embodiment does not limit the arrangement position of the rotation centers of the first valve disc 200 and the second valve disc 400.

[0099] like Figure 11 and Figure 13As shown, the hinged end of the first valve disc 200 is provided with a first hinge shaft 202, and the hinged end of the second valve disc 400 is provided with a second hinge shaft 402. The first hinge shaft 202 and the second hinge shaft 402 are nested and rotatably supported on the support portion 300 on the valve body 110. It should be noted that to avoid the airflow outlet 102 of the valve body 110 from being completely sealed after the first and second valve discs 200 and 400 are installed, resulting in air leakage, the first hinge shaft 202 should be provided at the end of the first valve disc 200, and the second hinge shaft 402 should be provided at the end of the second valve disc 400. When the first and second hinge shafts 202 and 402 are coaxially nested, the distance between the first and second valve discs 200 and 400 is ensured to be sufficiently close, and even a small gap between the first and second valve discs 200 and 400 can be sealed by the first and second hinge shafts 202 and 402. It should be noted that in order to ensure sealing, seals need to be provided between the first hinge shaft 202 and the second hinge shaft 402 and the valve body 110. Of course, seals also need to be provided between the first valve plate 200 and the valve body 110, and between the second valve plate 400 and the valve body 110.

[0100] like Figure 15 and Figure 16 As shown, in a specific embodiment of the present application, one of the first hinge shaft 202 and the second hinge shaft 402 is a central shaft, and the other is a tubular shaft, which is sleeved outside the central shaft. That is, the central shaft is an inner shaft, which can be a solid shaft, and the tubular shaft is an outer shaft, which can be a hollow shaft.

[0101] The support portion 300 is provided with a central hole 302 that cooperates with the central axis, and an annular hole 303 that cooperates with the axis of the tube body, and the annular hole 303 is arranged outside the central hole 302. The diameters of the central hole 302 and the annular hole 303 can be set by those skilled in the art according to needs.

[0102] For ease of understanding, the first hinge shaft 202 is taken as the central axis and the second hinge shaft 402 is taken as the tube body axis. Figure 13 As shown, the tube shaft has a circumferential clearance opening 4021 for circumventing the first valve disc 200, and the clearance opening 4021 extends from one end of the tube shaft to the other. The central angle of the annular hole 303 is greater than the central angle of the tube shaft, allowing the tube shaft to rotate within the annular hole 303. The curvature of the annular hole 303 must ensure that the second valve disc 400 has a sufficient opening range. In other words, the difference between the central angle of the annular hole 303 and the central angle of the tube shaft must be no less than the opening angle of the second valve disc 400; otherwise, the opening angle of the second valve disc 400 will be affected. In this embodiment, supporting the first hinge shaft 202 and the second hinge shaft 402 on the same support portion 300 makes it easier to ensure gas tightness.

[0103] like Figure 15 As shown, the central angle of the annular hole 303 is less than 360°, that is, there is a solid part between the two ends of the annular hole 303, so that the isolation body 301 between the annular hole 303 and the center hole 302 can be connected through the solid part between the two ends of the annular hole 303, thereby realizing the opening of the annular hole 303 and the center hole 302 on the support part 300.

[0104] A partition can be provided at the position corresponding to the airflow outlet 102 and the tube axis, and the tube axis is sealed against the partition via a seal to prevent airflow leakage through the tube axis. Of course, the airflow outlet 102 can also be provided without a partition. In this case, it is necessary to provide a partition at the position of the tube axis to prevent gas leakage through the avoidance opening 4021. For example, when the first valve disc 200 and the second valve disc 400 are in a closed state, a side wall of the avoidance opening 4021 adjacent to the airflow channel is sealed against the first valve disc 200 (the sealing method can be arbitrary, such as providing a sealing strip on the side wall of the avoidance opening 4021). This prevents gas from entering the tube axis through the avoidance opening 4021 and leaking through the lumen of the tube axis. When the first valve disc 200 and the second valve disc 400 are in an open state, leakage is not a concern.

[0105] like Figure 12 and Figure 14 As shown, the length of the central axis is W1a, and the length of the tube shaft is W2a, where W1a ≤ W2a. That is, when the tube shaft is sleeved onto the outside of the central axis, the central axis can be hidden inside the tube shaft, thus protecting the central axis and preventing particles from entering the gap between the central axis and the center hole 302 and affecting the smooth rotation of the central axis.

[0106] It should be noted that a protective cover (not shown) may also be provided on the support portion 300 to protect the tube shaft and the central axis. In addition to protecting the central axis, the protective cover can also protect the tube shaft, preventing particles from entering the gap between the tube shaft and the annular hole 303 and affecting the smooth rotation of the tube shaft.

[0107] The first valve disc 200 and the first hinge shaft 202 can be designed as an integral structure, and the second valve disc 400 and the second hinge shaft 402 can also be designed as an integral structure. To do this, it is necessary to first connect support portions 300 to both ends of the first hinge shaft 202 and the second hinge shaft 402. The two support portions 300 are then fixed to the valve body 110. For example, the two support portions 300 can be welded or fixed to the valve body 110 using fasteners. Of course, the support portion 300 and the valve body 110 on one side can also be designed as an integral structure, while the support portion 300 and the valve body 110 on the other side can be designed as a detachable structure to facilitate the installation of the first hinge shaft 202 and the second hinge shaft 402. The first valve disc 200 and the second valve disc 400 can both be metal sheets. The first valve disc 200 and the second valve disc 400 can also be structural components made of other materials, not limited to metal.

[0108] like Figure 12 As shown, the length of the first hinge shaft 202 is W1a, and the axial dimension of the first valve disc 200 along the first hinge shaft 202 is W1. Therefore, (W1a - W1) / W1 = 0.3-0.4. This configuration allows the length of the first hinge shaft 202 to be greater than the length of the first valve disc 200, allowing both ends of the first hinge shaft 202 to extend beyond the first valve disc 200. Experimental verification has shown that setting the ratio (W1a - W1) / W1 between 0.3 and 0.4 can prevent the first hinge shaft 202 from bending over time due to its long length. It can also prevent the support portion 300 from effectively supporting the first hinge shaft 202 due to its short length, resulting in insufficient support length for the first hinge shaft 202.

[0109] like Figure 14 As shown, the length of the second hinge shaft 402 is W2a, and the axial dimension of the second valve disc 400 along the second hinge shaft 402 is W2. Therefore, (W2a - W2) / W2 = 0.3-0.4. This configuration allows the length of the second hinge shaft 402 to be greater than the length of the second valve disc 400, allowing both ends of the second hinge shaft 402 to extend beyond the second valve disc 400. Experimental verification has shown that setting the ratio (W2a - W2) / W2 between 0.3 and 0.4 can prevent the second hinge shaft 402 from bending over time due to its longer length. It can also prevent the support portion 300 from effectively supporting the second hinge shaft 402 due to its shorter length, which could result in insufficient support length for the second hinge shaft 402.

[0110] In a specific embodiment of the present application, the rotation centers of the first valve disc 200 and the second valve disc 400 are located in the middle region of the airflow outlet 102. It should be noted that the middle region of the airflow outlet 102 does not refer to the exact center of the airflow outlet 102, but rather a range of regions. For example, the airflow outlet 102 can be divided into three equal regions along the arrangement direction of the first valve disc 200 and the second valve disc 400. The rotation centers of the first valve disc 200 and the second valve disc 400 can be located in the middle region, and can be located anywhere in the middle region.

[0111] Further, such as Figure 19 As shown, the first valve disc 200 is closer to the middle area in the airflow direction than the second valve disc 400. Those skilled in the art will appreciate that the middle area in the airflow direction is a high-pressure area, while the edge areas in the airflow direction are low-pressure areas. Therefore, the pressure in the area where the first valve disc 200 is located is higher than the pressure in the area where the second valve disc 400 is located.

[0112] In this embodiment, the coverage area of ​​the first valve disc 200 is larger than the coverage area of ​​the second valve disc 400 and / or the weight of the first valve disc 200 is larger than the weight of the second valve disc 400. In this embodiment, the opening resistance of the first valve disc 200 can be designed to be greater than the opening resistance of the second valve disc 400 by virtue of the size relationship between the first valve disc 200 and the second valve disc 400; the opening resistance of the first valve disc 200 can also be designed to be greater than the opening resistance of the second valve disc 400 by virtue of the size relationship between the first valve disc 200 and the second valve disc 400.

[0113] As a result, the first valve disc 200 with high opening resistance is correspondingly arranged in the high-pressure area, while the second valve disc 400 with low opening resistance is correspondingly arranged in the low-pressure area. The high-pressure gas in the high-pressure area generates a greater opening thrust on the first valve disc 200, while the low-pressure gas in the low-pressure area generates a smaller opening thrust on the second valve disc 400. Furthermore, since the first valve disc 200 in the high-pressure area has a greater opening resistance, while the second valve disc 400 in the low-pressure area has a smaller opening resistance, the opening angles of the first valve disc 200 and the second valve disc 400 in different gas pressure areas can be made equivalent, achieving pressure balance at the airflow outlet 102.

[0114] In a specific embodiment of the present application, the thickness of the first valve plate 200 is A, the thickness of the second valve plate 400 is B, the size of the first valve plate 200 along the arrangement direction of the first valve plate 200 and the second valve plate 400 is L1, and the size of the second valve plate 400 along the arrangement direction of the first valve plate 200 and the second valve plate 400 is L2.

[0115] Then B = (0.8-0.9)A, and L2 = (0.3-0.4)L1. That is, in this embodiment, the weight and coverage area of ​​the first valve disc 200 and the second valve disc 400 are changed by adjusting the thickness and width of the first valve disc 200 and the second valve disc 400, thereby changing the opening resistance of the first valve disc 200 and the second valve disc 400.

[0116] like Figure 7 As shown, the valve body portion 110 may be a plurality of valve bodies arranged along the first direction. Figure 7 In the illustrated embodiment, there are two valve bodies 110. Of course, the number of valve bodies 110 may exceed two, for example, three or four, or only one. This embodiment does not limit the specific number of valve bodies 110, and those skilled in the art may select the specific number of valve bodies 110 based on their specific needs.

[0117] The airflow inlets 101 of each valve body portion 110 can be interconnected or separated. This embodiment does not limit the connectivity status of the airflow inlets 101 of each valve body portion 110. The airflow outlets 102 of each valve body portion 110 are independent of each other, and each airflow outlet 102 of each valve body portion 110 is provided with a corresponding one-way valve disc. The number of one-way valve discs provided at the airflow outlets 102 of each valve body portion 110 can be the same or different; the arrangement of the one-way valve discs provided at the airflow outlets 102 of each valve body portion 110 can be the same or different; the coverage range and weight of each one-way valve disc provided at the airflow outlets 102 of each valve body portion 110 can be the same or different. That is, the one-way valve discs provided at the airflow outlets 102 of each valve body portion 110 can be the same or different.

[0118] like Figure 8 As shown, the valve body 110 is provided with airflow outlets 102 on both sides along the second direction. The first direction is perpendicular to the second direction, and the airflow outlets 102 on both sides of the valve body 110 are both connected to the airflow inlet 101 of the valve body 110. The airflow outlets 102 on both sides of the valve body 110 can be arranged symmetrically along the center plane of the valve body 110, with the center plane of the valve body 110 being the center plane in the second direction. In this embodiment, the provision of airflow outlets 102 on both sides of the valve body 110 further increases the open area of ​​the airflow outlets 102 on the valve body 110, which helps reduce EGR exhaust resistance and improves the engine's EGR rate capability.

[0119] The direction of airflow at the air inlet 101 forms an obtuse angle with the direction of airflow at the air outlet 102. That is, the plane on which the air outlet 102 is located is an inclined surface, so that the planes on which the air outlets 102 are located on both sides of the valve body 110 form an acute angle. This arrangement reduces the airflow turning angle, preventing the airflow from having to make a right-angle turn to pass through the one-way valve, thereby reducing air resistance.

[0120] like Figure 17 and Figure 18 As shown, the reset member 600 is a door closer, a valve disc connection portion is provided on the one-way valve disc, a valve body connection portion is provided on the valve body portion 110, one end of the door closer is connected to the valve disc connection portion, and the other end is connected to the valve body connection portion. Figure 11 and Figure 13 As shown, the valve disc connecting portion on the first valve disc 200 is the first valve disc connecting portion 201 , and the valve disc connecting portion on the second valve disc 400 is the second valve disc connecting portion 401 .

[0121] The check valve disc, under the influence of a pressure differential across the disc, can overcome the door closer's opening force, opening the disc. The disc is then reset using the door closer's cam mechanism and hydraulic cylinder, automatically closing the disc. Door closers are currently widely used for automatic closing of doors and windows. This embodiment utilizes the door closer in a check valve to achieve automatic closing of the disc. The specific structure and closing principle of the door closer are prior art and will not be further elaborated herein.

[0122] The door closer has a certain opening pressure. Since the EGR valve cannot achieve zero leakage, when the exhaust pressure is high, the EGR valve will leak some gas into the EGR system. The one-way valve of the traditional EGR system has a thin one-way valve disc. The leaked EGR exhaust gas will pass through the one-way valve into the intake side and participate in combustion, resulting in excessive engine emissions. The one-way valve of the present application has a certain opening pressure because the door closer has a certain opening pressure. Therefore, the leaked EGR exhaust gas is not enough to push the one-way valve disc to open due to its small gas volume, thereby ensuring that the EGR exhaust gas will not leak to the intake side. In this embodiment, the maximum opening angle of each one-way valve disc can be limited by the door closer. Of course, other limiters can also be set to limit the maximum opening angle of each one-way valve disc.

[0123] like Figure 21 As shown, an embodiment of the present application also discloses an EGR system, which includes an EGR pipeline, one end of the EGR pipeline is an exhaust side connection end, and the other end is an intake side connection end, so that one end of the EGR system can be connected to the exhaust pipeline of the engine body 01, and the other end is connected to the intake pipeline of the engine body 01. Figure 21 The gas in the pipeline shown by the medium-thick solid line is high-temperature gas, and the gas in the pipeline shown by the thin solid line is low-temperature gas.

[0124] In the direction from the exhaust side connection end to the intake side connection end, the EGR pipeline is connected in series with at least an EGR valve 02 and a one-way valve 03 as disclosed in the above embodiment. The EGR system disclosed in the embodiment of the present application has all the technical effects of the above-mentioned one-way valve 03, and will not be described in detail in this article. An EGR cooler 04 is also provided between the EGR valve 02 and the one-way valve 03 on the EGR pipeline. The main function of the EGR cooler 04 is to reduce the emission of nitrogen oxides (NOx) in the exhaust gas by cooling the recirculated exhaust gas and lowering the temperature of the combustion chamber, thereby optimizing the environmental performance of the engine. ‌‌

[0125] The present application also discloses an engine including the EGR system disclosed in the above embodiment. Due to the EGR system, the engine disclosed in the present application also has all the technical effects of the above EGR system, which will not be described in detail herein.

[0126] It should be noted that the engine can be a diesel engine, a gasoline engine, a gas engine (not limited to a natural gas engine and a hydrogen internal combustion engine), etc., and of course it can also be an engine that burns multiple fuels, including but not limited to an engine that burns a gasoline and methanol mixture, an engine that burns a natural gas and hydrogen mixture, etc.

[0127] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0128] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0129] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0130] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A one-way valve for sealing a controlled pipeline, wherein the controlled pipeline is an EGR pipeline, characterized in that: The one-way valve body (100) comprises at least one valve body portion (110), the valve body portion (110) being provided with an air flow channel for communicating with the controlled pipeline, one end of the air flow channel being an air flow inlet (101) and the other end being an air flow outlet (102); The air flow outlet (102) is provided with at least two one-way valve discs, each of which is rotatably engaged with the valve body (110), and the free end of each one-way valve disc is connected to the valve body (110) via a reset member (600). At least two of the one-way valve discs are arranged in different pressure areas of the air flow outlet (102), and the opening resistance of the one-way valve disc corresponding to the area with high outlet pressure is greater than the opening resistance of the one-way valve disc corresponding to the area with low outlet pressure, so that the opening angles of the one-way valve discs in different gas pressure areas are comparable, thereby achieving the purpose of pressure balance of the air flow outlet (102).

2. The one-way valve according to claim 1, wherein: Each of the air flow outlets (102) is provided with two one-way valve discs, namely a first valve disc (200) and a second valve disc (400), and the rotation centers of the first valve disc (200) and the second valve disc (400) are coaxially arranged.

3. The one-way valve according to claim 2, wherein: The hinged end of the first valve disc (200) is provided with a first hinge shaft (202), and the hinged end of the second valve disc (400) is provided with a second hinge shaft (402). The first hinge shaft (202) and the second hinge shaft (402) are nested and rotatably supported on the support portion (300) on the valve body portion (110).

4. The one-way valve according to claim 3, wherein: One of the first hinge shaft (202) and the second hinge shaft (402) is a central shaft, and the other is a tubular shaft, wherein the tubular shaft is sleeved on the outside of the central shaft; The support portion (300) is provided with a central hole (302) that cooperates with the central axis, and an annular hole (303) that cooperates with the tube body axis.

5. The one-way valve according to claim 4, wherein: The length of the central axis is W1a, the length of the tube body axis is W2a, and W1a≤W2a.

6. The one-way valve according to claim 4, wherein: The length of the first hinge shaft (202) is W1a, and the dimension of the first valve plate (200) in the axial direction along the first hinge shaft (202) is W1, then (W1a-W1) / W1=0.3-0.4; and / or, The length of the second hinge shaft (402) is W2a, and the dimension of the second valve plate (400) in the axial direction along the second hinge shaft (402) is W2, then (W2a-W2) / W2=0.3-0.

4.

7. The one-way valve according to claim 4, wherein: The first hinge shaft (202) is a central shaft, and the second hinge shaft (402) is a tube shaft; The tube shaft has a circumferentially ...

8. The one-way valve according to claim 7, wherein: The central angle of the annular hole (303) is less than 360°.

9. The one-way valve according to any one of claims 2 to 8, characterized in that: The rotation centers of the first valve plate (200) and the second valve plate (400) are located in the middle area of ​​the air flow outlet (102).

10. The one-way valve according to any one of claims 2 to 8, characterized in that: The first valve plate (200) is closer to the middle area in the airflow direction than the second valve plate (400); The coverage area of ​​the first valve sheet (200) is greater than the coverage area of ​​the second valve sheet (400), and / or the weight of the first valve sheet (200) is greater than the weight of the second valve sheet (400).

11. The one-way valve according to claim 10, wherein: The thickness of the first valve plate (200) is A, the thickness of the second valve plate (400) is B, the dimension of the first valve plate (200) along the arrangement direction of the first valve plate (200) and the second valve plate (400) is L1, and the dimension of the second valve plate (400) along the arrangement direction of the first valve plate (200) and the second valve plate (400) is L2; Then B=(0.8-0.9)A, L2=(0.3-0.4)L1.

12. The one-way valve according to any one of claims 1 to 8, wherein: The valve body parts (110) are multiple and arranged along the first direction, and the air flow inlets (101) of the valve body parts (110) are connected or separated.

13. The one-way valve according to claim 12, wherein: The air flow outlets (102) are provided on both sides of the valve body (110) along the second direction, the first direction is perpendicular to the second direction, and the air flow outlets (102) on both sides of the valve body (110) are communicated with the air flow inlet (101) of the valve body (110).

14. The one-way valve according to claim 13, wherein: The airflow direction at the airflow inlet (101) and the airflow direction at the airflow outlet (102) form an obtuse angle.

15. The one-way valve according to any one of claims 1 to 8, characterized in that: The reset member (600) is a door closer, the one-way valve disc is provided with a valve disc connection portion, the valve body portion (110) is provided with a valve body connection portion, one end of the door closer is connected to the valve disc connection portion, and the other end is connected to the valve body connection portion.

16. The one-way valve according to any one of claims 1 to 8, wherein: The thickness of the one-way valve plate is 0.9 mm to 3 mm.

17. An EGR system, characterized in that: The EGR pipe comprises an exhaust side connection end at one end and an intake side connection end at the other end; In the direction from the exhaust side connection end to the intake side connection end, the EGR pipeline is connected in series with at least an EGR valve and a one-way valve as described in any one of claims 1 to 16.

18. An engine, characterized in that: Comprising the EGR system of claim 17.

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