An engine EGR conduit

Abstract

The application belongs to the technical field of engines and discloses an engine EGR pipeline. The first pipeline and the second pipeline are parallel to each other, the first pipeline is wavy, the first channel and the second channel in the first pipeline are alternately connected, the second pipeline is wavy, the third channel and the fourth channel in the second pipeline are alternately connected, the first auxiliary pipeline is connected at the wave trough where the first channel and the second channel meet, the first auxiliary pipeline extends along the first channel and communicates with the fourth channel, and the other end of the first auxiliary pipeline is bent towards the second pipeline; the second auxiliary pipeline is connected at the wave peak where the third channel and the fourth channel meet, the second auxiliary pipeline extends along the fourth channel and communicates with the first channel, and the other end of the second auxiliary pipeline is bent towards the first pipeline; the problem that the valve plate of the one-way valve is broken under impact in the prior art, resulting in the problem of engine cylinder pulling, is solved.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more particularly to an engine EGR pipeline. Background Technology

[0002] Currently, medium and heavy-duty natural gas engines choose stoichiometric combustion to meet China VI emission limits. Compared to lean combustion, stoichiometric combustion significantly increases in-cylinder heat load and knock risk, resulting in higher fuel consumption for effective power output. However, modern high-pressure cooled EGR systems can reduce heat load and knock tendency, thereby reducing fuel consumption. The impact of EGR on in-cylinder combustion is far greater than that of lean combustion. Even with the EGR valve at its maximum opening, introducing EGR into turbocharged engines often presents challenges. At low loads, the boost pressure is low, allowing exhaust gas to be introduced before the turbine and into the turbocharger, taking advantage of the higher exhaust gas pressure before the turbine compared to the boosted fresh air pressure. At high loads, the boosted air pressure is high, and even with the EGR valve at its maximum opening, the boost pressure exceeds the exhaust pressure, preventing exhaust gas from being introduced into the intake manifold. In the prior art, in order to prevent pressurized fresh air from flowing back into the exhaust gas, an EGR check valve is usually installed on the EGR pipeline. This valve can effectively utilize the exhaust pulse to increase the EGR flow, thereby ensuring sufficient exhaust gas supply and improving the EGR rate. Examples include patents CN200985843Y (a check valve), CN202100349U (an EGR check valve), and CN112392631A (an EGR check valve and EGR system).

[0003] Currently, the valve plate of the EGR one-way valve has a cantilever beam structure. Since the EGR gas passing through the EGR one-way valve is pulsed, the valve plate of the EGR one-way valve bends back and forth under the action of the pulse airflow. Moreover, the valve plate moves at a high frequency under the influence of the exhaust pulse, so the valve plate has a high probability of breaking at the bending point. The debris from the broken part of the valve plate will enter the engine intake system through the intake manifold, affecting the normal operation of the engine and even causing engine cylinder scoring. The service life of the EGR one-way valve is relatively short, which can also cause permanent engine damage. Summary of the Invention

[0004] The purpose of this invention is to provide an engine EGR pipeline that solves the problem of cylinder scoring caused by the valve plate of the one-way valve breaking under impact in the prior art.

[0005] To achieve this objective, the present invention adopts the following technical solution: The present invention provides an engine EGR pipeline, including a first pipeline and a second pipeline, the first pipeline and the second pipeline being parallel to each other, the first pipeline being wavy, the first pipeline including a first channel and a second channel, the first channel and the second channel being alternately connected, the first channel and the second channel being connected in a V-shape, the second pipeline being wavy, the second pipeline including a third channel and a fourth channel, the third channel and the fourth channel being alternately connected, the third channel and the fourth channel being connected in a V-shape; a first auxiliary pipe is connected at the trough where the first channel and the second channel meet, the first auxiliary pipe extending along the direction of the first channel and communicating with the fourth channel, the other end of the first auxiliary pipe bending towards the second pipeline; a second auxiliary pipe is connected at the crest where the third channel and the fourth channel meet, the second auxiliary pipe extending along the direction of the fourth channel and communicating with the first channel, the other end of the second auxiliary pipe bending towards the first pipeline.

[0006] Preferably, the junction of the first channel and the second channel is arc-shaped.

[0007] Preferably, the angle between the first channel and the second channel is an obtuse angle.

[0008] Preferably, the junction of the third channel and the fourth channel is arc-shaped.

[0009] Preferably, the angle between the third channel and the fourth channel is an obtuse angle.

[0010] Preferably, the end of the first auxiliary tube is bent into an arc shape, and the first auxiliary tube is tangent to the connected fourth channel.

[0011] Preferably, the end of the second auxiliary tube is bent into an arc shape, and the second auxiliary tube is tangent to the connected first channel.

[0012] Preferably, the cross-sectional area of ​​the first channel is larger than that of the second channel, and the cross-sectional area of ​​the third channel is larger than that of the fourth channel.

[0013] Preferably, a first conduit pipe and a second conduit pipe are installed on both sides of the first pipeline and the second pipeline, respectively. A first flange is installed at the end of the first conduit pipe, and a second flange is connected to the end of the second conduit pipe.

[0014] Beneficial effects: Exhaust gas flows in the same direction along the first and second pipes. When the exhaust gas flows forward in the first and second pipes, it will not enter the first and second auxiliary pipes. At this time, the engine EGR pipe is in a conductive state, and the exhaust gas can flow smoothly. When the exhaust gas flows in the opposite direction in the first and second pipes, the exhaust gas in the first channel enters the fourth channel along the extended first auxiliary pipe and collides with the exhaust gas in the fourth channel, forming a blocking effect and preventing the exhaust gas from continuing to flow forward. Similarly, the exhaust gas in the fourth channel enters the first channel along the second auxiliary pipe and collides with the exhaust gas in the first channel, forming a blockage and preventing the exhaust gas from flowing forward. In this way, the exhaust gas in the first and second pipes mutually prevents the exhaust gas in the engine EGR pipe from flowing forward, forming a blocking effect. This achieves one-way conduction of the engine EGR pipe, eliminating the need for a valve plate structure. By achieving one-way conduction of the engine EGR pipe through the blocking effect, cylinder scoring problems are avoided, resulting in higher reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the forward flow of exhaust gas in the engine EGR pipeline of the present invention;

[0016] Figure 2 This is a schematic diagram of the reverse flow of exhaust gas in the engine EGR pipeline of the present invention;

[0017] Figure 3 This is a main diagram of the engine EGR pipeline of the present invention.

[0018] In the diagram: 1. First pipeline; 11. First channel; 12. Second channel; 2. Second pipeline; 21. Third channel; 22. Fourth channel; 3. First auxiliary pipe; 4. Second auxiliary pipe; 5. First flange; 6. Second flange; 7. First main pipe; 8. Second main pipe. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0023] Under current technology, the valve plates in the engine's EGR line can suffer damage such as bending under repeated use. This allows metal residue from the valve plates to enter the engine cylinders with the exhaust gases, causing scratches, cylinder scoring, and other problems, thus reducing the engine's lifespan.

[0024] To solve the above problems, such as Figures 1 to 3As shown, the present invention provides an engine EGR pipeline, including a first pipeline 1 and a second pipeline 2, which are parallel to each other. The first pipeline 1 is wavy and includes a first channel 11 and a second channel 12, which are alternately connected and connected in a V-shape. The second pipeline 2 is wavy and includes a third channel 21 and a fourth channel 22, which are alternately connected and connected in a V-shape. A first auxiliary pipe 3 is connected at the trough where the first channel 11 and the second channel 12 meet. The first auxiliary pipe 3 extends along the direction of the first channel 11 and connects to the fourth channel 22. The other end of the first auxiliary pipe 3 bends toward the second pipeline 2. A second auxiliary pipe 4 is connected at the crest where the third channel 21 and the fourth channel 22 meet. The second auxiliary pipe 4 extends along the direction of the fourth channel 22 and connects to the first channel 11. The other end of the second auxiliary pipe 4 bends toward the first pipeline 1.

[0025] The first pipe 1 and the second pipe 2 are placed in parallel and are connected to each other by the first auxiliary pipe 3 and the second auxiliary pipe 4. The first pipe 1 and the second pipe 2 can be connected to a set of cylinders or the first cylinder and the second cylinder can each be connected to two sets of cylinders. When the first pipe 1 and the second pipe 2 are connected to the same set of cylinders at the same time, the two ends of the first pipe 1 and the second pipe 2 converge, forming a first converging pipe 7 and a second converging pipe 8 respectively. The exhaust gas generated inside the engine is split in the first pipe 1 and the second pipe 2 and eventually merges or causes a blockage effect, or the exhaust gas in the first pipe 1 and the second pipe 2 can be independently connected to different cylinders, and the exhaust gas in different cylinders can block each other or be discharged independently.

[0026] Exhaust gas flows simultaneously in the first pipe 1 and the second pipe 2 of the engine's EGR system, and the direction of exhaust gas flow is the same. Figures 1 to 2As shown, when the exhaust gas flows from right to left, it is a forward flow, requiring conduction within the engine's EGR pipe. At this time, the exhaust gas in the first pipe 1 flows along its own pipe, and the exhaust gas in the second pipe 2 flows along its own pipe. Due to inertia, the exhaust gas will not enter the first auxiliary pipe 3 and the second auxiliary pipe 4, which have larger bend angles. The exhaust gas flows out along the first pipe 1 and the second pipe 2 to the other side. When the exhaust gas flows from left to right, it is a reverse flow. The exhaust gas in the first channel 11 of the first pipe 1 will enter the first auxiliary pipe 3 due to its own inertia, and finally enter the fourth channel 22 of the second pipe 2. At this time, the exhaust gas in the first auxiliary pipe 3... The exhaust gas collides with the exhaust gas in the fourth channel 22, creating resistance and preventing the exhaust gas from continuing to flow to the right. At the same time, the exhaust gas in the fourth channel 22 in the second pipe 2 will enter the first channel 11 through the second auxiliary pipe 4, colliding with the exhaust gas flowing to the right in the first pipe 1 and blocking the exhaust gas in the first pipe 1 from flowing to the right. The first auxiliary pipe 3 and the second auxiliary pipe 4 are alternately installed in the engine EGR pipe, mutually blocking the exhaust gas from flowing further to the right. Finally, the exhaust gas stops flowing to the right, realizing the one-way cutoff of the engine EGR pipe. The engine EGR pipe used in this invention does not have any moving parts inside, and only the first auxiliary pipe 3 and the second auxiliary pipe 4 are used to obstruct the flow of exhaust gas, which has higher reliability.

[0027] The wavy first pipe 1 and second pipe 2 allow the first auxiliary pipe 3 and second auxiliary pipe 4 to extend shorter distances and have smaller curvatures at the ends, maintaining the flow velocity of exhaust gas within the first auxiliary pipe 3 and second auxiliary pipe 4. The junction of the first channel 11 and the second channel 12 is arc-shaped, which facilitates smoother airflow, especially when the exhaust gas is flowing forward within the engine's EGR system. Simultaneously, the angle between the first channel 11 and the second channel 12 is obtuse, reducing velocity loss during the airflow's turn at the obtuse angle.

[0028] The junction of the third channel 21 and the fourth channel 22 is arc-shaped, which allows for smoother airflow. This ensures smoother exhaust gas flow during forward movement within the engine's EGR system. Furthermore, the angle between the third channel 21 and the fourth channel 22 is obtuse, reducing speed loss during the airflow's turn at this obtuse angle.

[0029] The first auxiliary pipe 3 is bent into an arc shape at its end so that the exhaust gas does not lose speed when flowing in the first auxiliary pipe 3. The exhaust gas has enough momentum to collide with the exhaust gas in the second pipe 2, preventing the exhaust gas in the second pipe 2 from continuing to flow in the opposite direction. The first auxiliary pipe 3 is tangent to the connected fourth channel 22, so that the exhaust gas in the first auxiliary pipe 3 can collide with the exhaust gas in the second pipe 2 in a near-opposite direction, thus blocking the exhaust gas from continuing to flow to the right to the greatest extent.

[0030] The second auxiliary pipe 4 is bent into an arc shape at its end so that the exhaust gas does not lose speed when flowing in the second auxiliary pipe 4. The exhaust gas has enough momentum to collide with the exhaust gas in the first pipe 1, blocking the exhaust gas in the first pipe 1 from continuing to flow in the opposite direction. The second auxiliary pipe 4 is tangent to the connected first channel 11, so that the exhaust gas in the second auxiliary pipe 4 can collide with the exhaust gas in the first pipe 1 in a near-opposite direction, blocking the exhaust gas from continuing to flow to the right to the greatest extent.

[0031] The cross-sectional area of ​​the first channel 11 is larger than that of the second channel 12. This allows most of the exhaust gas to enter the first auxiliary pipe 3 when it flows in reverse to the trough of the first pipe 1, thus blocking the forward flow of exhaust gas in the second pipe 2. Similarly, the cross-sectional area of ​​the third channel 21 is larger than that of the fourth channel 22, allowing all the exhaust gas to enter the second auxiliary pipe 4 when it flows to the crest of the second pipe 2. This completely blocks the reverse flow of exhaust gas in the first pipe 1, resulting in a better blocking effect of the engine EGR pipe of this invention. When the exhaust gas flows in reverse, it can be completely blocked by the engine EGR pipe.

[0032] A first conduit 7 and a second conduit 8 are installed on both sides of the first conduit 1 and the second conduit 2, respectively. A first flange 5 is installed at the end of the first conduit 7, and a second flange 6 is connected to the end of the second conduit 8. The engine EGR pipeline can be installed before or after the EGR cooler through the first flange 5 and the second flange 6, and can be flexibly adjusted according to design requirements.

[0033] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An engine EGR pipeline, characterized in that, It includes a first pipe (1) and a second pipe (2), which are parallel to each other. The first pipe (1) is wavy and includes a first channel (11) and a second channel (12). The first channel (11) and the second channel (12) are alternately connected and connected in a V-shape. The second pipe (2) is wavy and includes a third channel (21) and a fourth channel (22). The third channel (21) and the fourth channel (22) are alternately connected and connected in a V-shape. The first channel (11) A first auxiliary pipe (3) is connected at the trough where the third channel (21) and the second channel (22) meet. The first auxiliary pipe (3) extends along the direction of the first channel (11) and connects with the fourth channel (22). The other end of the first auxiliary pipe (3) bends toward the second pipe (2). A second auxiliary pipe (4) is connected at the crest where the third channel (21) and the fourth channel (22) meet. The second auxiliary pipe (4) extends along the direction of the fourth channel (22) and connects with the first channel (11). The other end of the second auxiliary pipe (4) bends toward the first pipe (1). The first pipe (1) and the second pipe (2) are connected to each other through the first auxiliary pipe (3) and the second auxiliary pipe (4). The junction of the first channel (11) and the second channel (12) is arc-shaped, and the included angle between the first channel (11) and the second channel (12) is an obtuse angle; The junction of the third channel (21) and the fourth channel (22) is arc-shaped, and the included angle between the third channel (21) and the fourth channel (22) is an obtuse angle; The cross-sectional area of ​​the first channel (11) is greater than that of the second channel (12), and the cross-sectional area of ​​the third channel (21) is greater than that of the fourth channel (22).

2. The engine EGR pipeline according to claim 1, characterized in that, The end of the first auxiliary tube (3) is bent into an arc shape, and the first auxiliary tube (3) is tangent to the connected fourth channel (22).

3. The engine EGR pipeline according to claim 1, characterized in that, The end of the second auxiliary tube (4) is bent into an arc shape, and the second auxiliary tube (4) is tangent to the connected first channel (11).

4. The engine EGR pipeline according to claim 1, characterized in that, A first conduit (7) and a second conduit (8) are respectively installed on both sides of the first conduit (1) and the second conduit (2). A first flange (5) is installed at the end of the first conduit (7), and a second flange (6) is connected to the end of the second conduit (8).

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