A pipe arrangement of an EGR system and an engine

Abstract

The utility model discloses a kind of pipeline arrangement structures of EGR system, the EGR system includes sequentially connected EGR intake connection pipe, EGR cooler, EGR pipeline, EGR valve pipeline and mixer, wherein, the EGR intake connection pipe is venturi pipe structure, it includes air inlet end and air outlet end, the air inlet end is contraction pipe, it includes 2 air inlet shunt pipe and link bus pipe, and it is Y-shaped pipe structure;The air outlet end is expansion pipe, the small end of the expansion pipe is connected with the link bus pipe;The mixer is venturi mixer, and the EGR valve pipeline is connected in the side of the venturi mixer.The utility model has the advantages of compact structure, convenient drainage, prevent EGR system pipeline from being frozen and cracked by accumulated water expansion etc..

Description

Technical Field

[0001] This utility model relates to the field of EGR system technology, and in particular to a pipeline layout structure and engine for an EGR system. Background Technology

[0002] In existing EGR system piping layouts, on the one hand, unstable engine exhaust pressure and high intake pressure lead to insufficient EGR intake, affecting engine combustion; on the other hand, water accumulated in the EGR system piping converges towards the EGR cooler, causing excessive water buildup. This leads to the water inside the EGR cooler freezing and cracking in low-temperature environments. Some existing technologies typically install drain outlets on the EGR cooler to drain the accumulated water, but this requires additional drain pipes, complicating the manufacturing process.

[0003] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0004] The main purpose of this utility model is to propose a compact EGR system pipeline layout structure and engine that facilitates drainage and prevents the EGR system pipeline from cracking due to water accumulation and freezing.

[0005] Therefore, this utility model proposes a pipeline layout structure and engine for an EGR system.

[0006] Preferably, the present invention may also have the following technical features:

[0007] An EGR system piping layout structure, the EGR system comprising, in sequence, an EGR inlet connector, an EGR cooler, an EGR pipeline, an EGR valve pipeline, and a mixer, wherein the EGR inlet connector is a Venturi tube structure, including an inlet end and an outlet end, the inlet end being a contraction tube, comprising two inlet branch pipes and a connecting manifold, forming a Y-shaped pipe structure; the outlet end being an expansion tube, the small end of the expansion tube being connected to the connecting manifold; the mixer is a Venturi mixer, and the EGR valve pipeline is connected to the side of the Venturi mixer.

[0008] Furthermore, the intake manifold comprises two pipes, the total cross-sectional area of ​​which is greater than the cross-sectional area of ​​the connecting manifold.

[0009] Furthermore, the cross-sectional area at the connection between the manifold and the outlet expansion pipe is the smallest, and the cross-sectional area gradually increases along the axial direction of the expansion pipe.

[0010] An engine includes the piping arrangement structure of the EGR system described above, and also includes an exhaust pipe, which is a dual-chamber pipe and is respectively connected to two of the intake split pipes.

[0011] Furthermore, the EGR pipeline is installed at the front end of the engine, with its installation height higher than the EGR cooler and mixer. The EGR cooler is inclined, with its higher end connected to the EGR pipeline and its lower end connected to the EGR intake pipe via a U-shaped pipe 2. The other end of the intake pipe is connected to the exhaust pipe at an angle downwards. The EGR valve pipeline is inclined, with its higher end connected to the EGR pipeline and its lower end connected to the mixer.

[0012] Furthermore, the EGR system piping is arranged in a U-shape on the engine, and the EGR valve piping is arranged on the intake side of the engine.

[0013] Furthermore, the tilt angle of the EGR intake pipe and the EGR cooler is 8-12°.

[0014] Furthermore, the tilt angle of the EGR intake pipe and the EGR cooler is 9-10°.

[0015] The advantages of this utility model compared with the prior art include: the EGR intake pipe forms a Venturi tube and pulse retarder structure, which ensures stable EGR intake pressure. At the same time, the EGR valve pipe outlet is connected to the Venturi mixer, which can reduce the impact of engine intake pipe pressure on EGR valve pipe outlet. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is the front view of this utility model.

[0018] Figure 3 This is a rear view of the present invention.

[0019] Figure 4 This is a cross-sectional structural diagram of the air intake pipe of this utility model. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present invention.

[0021] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0022] like Figure 1-4 The diagram illustrates the piping arrangement of an EGR system. The EGR system includes, in sequence, an EGR inlet connector 1, an EGR cooler 3, an EGR pipeline 4, an EGR valve pipeline 5, and a mixer 7. The EGR inlet connector 1 is a Venturi-type pipe structure, including an inlet end and an outlet end 11. The inlet end is a contraction pipe, including an inlet branch pipe 12 and a connecting manifold 13, forming a Y-shaped pipe structure. The outlet end 11 is an expansion pipe, with its small end connected to the connecting manifold 13, and its large end connected to the EGR cooler 3 via a U-shaped pipeline 2. Two corrugated pipe sections 21 are connected to the U-shaped pipeline to improve seismic resistance. The EGR valve pipeline 5 is connected to the side of the Venturi mixer. In this embodiment, the EGR intake manifold 1 forms a Venturi tube and pulse retarder structure to ensure stable EGR intake pressure. At the same time, the outlet of the EGR valve line 5 is connected to the Venturi mixer, which can reduce the impact of the engine intake manifold pressure on the outlet of the EGR valve line 5.

[0023] Specifically, the intake manifold 12 comprises two pipes, the total cross-sectional area of ​​which is greater than that of the connecting manifold 13. This allows the airflow from the two separate cavities at one end of the intake manifold 12 to gradually merge into one pipe, forming the connecting manifold 13 and connecting it to the outlet end 11. In this way, the cross-sectional area at the connection between the connecting manifold 13 and the outlet end 11 is minimized, and the cross-sectional area gradually increases along the axial direction of the expansion pipe.

[0024] An engine includes the aforementioned EGR system piping arrangement and an exhaust pipe 8. The exhaust pipe 8 is a dual-chamber pipe, connected to two intake manifolds 12 at the intake end of the EGR intake pipe 1. The EGR pipe 4 is installed at the front end of the engine, with its installation height higher than the EGR cooler 3 and mixer 7. The EGR cooler 3 is inclined, with its higher end connected to the EGR pipe 4 and its lower end connected to the EGR intake pipe 1 via a U-shaped pipe 2. The other end of the intake pipe 1 is connected diagonally downwards to the exhaust pipe 8. The EGR valve pipe 5 is inclined, with its higher end connected to the EGR pipe 4 and its lower end connected to the mixer 7. An EGR valve 6 is provided on the EGR valve pipe 5. In this embodiment, the EGR intake pipe 1 is inclined, and its lower end is connected to the exhaust pipe end to prevent water accumulation in the EGR intake pipe from flowing into the EGR cooler. Meanwhile, since the EGR pipe 4 has a small diameter and no space to accommodate accumulated water, it is positioned at a high level so that the accumulated water inside flows to the EGR valve pipe 5 and the EGR cooler 3. The water flowing to the EGR valve pipe 5 can then enter the mixer 7. The mixer 7 is a Venturi mixer, such as the one disclosed in existing patent document CN223048906U. The mixer 7 and the EGR cooler 3 have relatively large internal spaces, capable of accommodating a small amount of accumulated water while ensuring the safety of the components.

[0025] Preferably, the tilt angle of the EGR intake pipe 1 and the EGR cooler 3 is 8-12°, and more preferably 9-10°.

[0026] Preferably, the EGR system piping is arranged in a U-shape on the engine, and the EGR valve piping 5 is arranged on the intake side of the engine.

[0027] By actively and efficiently extracting EGR exhaust gas using a venturi tube, and then further enhancing the extraction capacity and EGR introduction rate using a venturi mixer, while improving the mixing uniformity of EGR and air, the technology fundamentally solves the two core challenges of EGR introduction difficulty and uneven mixing in high-boost engines. This is an advanced technical route to achieve ultra-low nitrogen oxide emissions.

[0028] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0029] Although exemplary embodiments of the present invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the present invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the present invention.

Claims

1. A piping layout structure for an EGR system, characterized in that: The EGR system includes an EGR intake connector, an EGR cooler, an EGR pipeline, an EGR valve pipeline, and a mixer connected in sequence. The EGR intake connector is a Venturi tube structure, including an intake end and an outlet end. The intake end is a contraction tube, which includes two intake branch pipes and a connecting manifold, forming a Y-shaped tube structure. The outlet end is an expansion tube, and the small end of the expansion tube is connected to the connecting manifold. The mixer is a Venturi mixer, and the EGR valve pipeline is connected to the side of the Venturi mixer.

2. The piping layout structure of the EGR system as described in claim 1, characterized in that: The intake manifold comprises two pipes, the total cross-sectional area of ​​which is greater than the cross-sectional area of ​​the connecting manifold.

3. The piping layout structure of the EGR system as described in claim 2, characterized in that: The cross-sectional area at the connection between the manifold and the expansion pipe at the outlet end is the smallest, and the cross-sectional area gradually increases along the axial direction of the expansion pipe.

4. An engine comprising the piping arrangement structure of the EGR system as described in claim 2, characterized in that: It also includes an exhaust pipe, which is a dual-chamber pipe and is connected to two of the intake split pipes respectively.

5. The engine as described in claim 4, characterized in that: The EGR pipeline is installed at the front end of the engine, and its installation height is higher than that of the EGR cooler and the mixer. The EGR cooler is inclined, with its high end connected to the EGR pipeline and its low end connected to the EGR intake pipe through a U-shaped pipe (2). The other end of the intake pipe is connected to the exhaust pipe at an angle downward. The EGR valve pipeline is inclined, with its high end connected to the EGR pipeline and its low end connected to the mixer.

6. The engine as described in claim 5, characterized in that: The EGR system piping is arranged in a U-shape on the engine, and the EGR valve piping is located on the intake side of the engine.

7. The engine as described in claim 5, characterized in that: The tilt angle of the EGR intake pipe and the EGR cooler is 8-12°.

8. The engine as claimed in claim 7, characterized in that: The tilt angle of the EGR intake pipe and the EGR cooler is 9-10°.

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