CN220505199U

CN220505199U - EGR (exhaust gas Recirculation) air inlet structure and vehicle

Info

Publication number: CN220505199U
Application number: CN202321944062.9U
Authority: CN
Inventors: 窦站成; 姚亚俊; 崔京朋; 李俊琦; 张晨; 梁栋; 陈雅琪; 李植新
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-07-24
Filing date: 2023-07-24
Publication date: 2024-02-20
Anticipated expiration: 2033-07-24

Abstract

The utility model belongs to the technical field of vehicles, and discloses an EGR air inlet structure and a vehicle, wherein the EGR air inlet structure comprises an air inlet main pipe, an air inlet branch pipe and an exhaust gas cavity, the air inlet main pipe is provided with an air inlet, the air inlet branch pipe is communicated with the air inlet main pipe, the air inlet branch pipe is provided with an air outlet, the air outlet is used for being communicated with a cylinder cover, the exhaust gas cavity is integrally arranged on the air inlet main pipe and the air inlet branch pipe, the exhaust gas cavity is provided with an EGR inlet and an EGR outlet, the EGR outlet is communicated with the air inlet branch pipe, the position of the air inlet is changed when different vehicle types are matched, calculation of the uniformity of EGR mixing is not needed, the universality is high, EGR waste gas enters through the exhaust gas cavity, the high-temperature EGR waste gas can heat the wall surface of the exhaust gas cavity, the freezing risk caused by mixing of the EGR waste gas and low-temperature fresh air is reduced, the direction of the EGR outlet is the same as the direction of the air outlet, the air inlet resistance is small, the air outlet of the EGR waste gas can not be influenced in the air inlet process, and an additional mixer is not needed in an air inlet channel of an engine, and the EGR rate is favorable for improving.

Description

EGR (exhaust gas Recirculation) air inlet structure and vehicle

Technical Field

The utility model relates to the technical field of vehicles, in particular to an EGR (exhaust gas Recirculation) air inlet structure and a vehicle.

Background

The intake manifold is one of the important parts of an internal combustion engine and functions to uniformly distribute fresh air into the individual cylinders. In order to improve emissions from internal combustion engines, more and more engines use an exhaust gas recirculation system (Exhaust Gas Recirculation, EGR) that separates a portion of the exhaust gas from the exhaust pipe, controls the flow of the exhaust gas using an EGR valve, mixes it with fresh air by an EGR mixer (or mixing tube), and then enters an intake manifold that distributes the mixture to each cylinder for combustion.

There are three conventional EGR system arrangements: 1. the air inlet connecting pipe is internally provided with a casting type mixing structure, the EGR mixing structure is cast inside the air inlet connecting pipe, the mixing structure is provided with two wall surfaces, and a mixing section for EGR waste gas and fresh air inlet is arranged between the wall surfaces. 2. The EGR pipeline is inserted into the air inlet connecting pipe and is close to the fresh air inlet, and the EGR waste gas and the fresh air are naturally and fully mixed by lengthening the air inlet connecting pipe pipeline. 3. The perforated mixing structure has the advantages that for the machine type with small arrangement space, the length of the air inlet connecting pipe is limited, natural mixing cannot be realized, the perforated structure can be added at the mixing section, and EGR waste gas and fresh air are fully mixed.

The traditional technical scheme has the following defects: 1. because a machine is matched with different vehicle types to cause the position change of the air inlet, the change of the fresh air inlet direction inevitably causes the adjustment of the angle of the mixed structure, and the universality is poor. 2. When the air inlet throttle valve is in the process of reducing the opening degree, a negative pressure area is formed behind the throttle valve, so that EGR waste gas is sucked backwards, when the engine is in a cold environment, the sucked waste gas meets a valve plate with low wall temperature and fresh air, and water in the EGR waste gas is easy to separate out, so that the EGR waste gas is frozen. 3. Fresh air is required to be mixed with EGR waste gas through a punching structure, so that the resistance is large, and the improvement and realization of the EGR rate are not facilitated.

Therefore, there is a need for an EGR intake structure and a vehicle to solve the above problems.

Disclosure of Invention

The utility model aims to provide an EGR air inlet structure, which has high universality and reduces the icing risk caused by mixing EGR waste gas and low-temperature fresh air without calculating the mixing uniformity of the EGR. And the air inlet resistance is small, thereby being beneficial to improving the EGR rate.

In order to solve the problems existing in the prior art, the utility model adopts the following technical scheme:

an EGR intake structure comprising:

the air inlet main pipe is provided with an air inlet;

the air inlet branch pipe is communicated with the air inlet main pipe, and is provided with an air outlet which is used for communicating with a cylinder cover;

the exhaust gas cavity is integrally arranged in the air inlet manifold and the air inlet branch pipe, the exhaust gas cavity is provided with an EGR inlet and an EGR outlet, the EGR outlet is communicated with the air inlet branch pipe, and the direction of the EGR outlet is the same as the direction of the air outlet.

Preferably, the cross section of the exhaust gas cavity is J-shaped.

Preferably, the EGR outlet is provided on the intake manifold.

Preferably, the number of the air inlet branch pipes is plural, and the air inlet branch pipes are arranged at intervals along the length direction of the air inlet manifold.

Preferably, the number of the EGR outlets is plural, and the plural EGR outlets are arranged in one-to-one correspondence with the plural intake branch pipes.

Preferably, the EGR inlet is arranged at an intermediate position of the intake manifold.

Preferably, the opening direction of the intake port is arranged perpendicular to the opening direction of the EGR inlet port.

Preferably, the EGR inlet direction is the same as the EGR outlet direction.

Preferably, the intake velocity of the intake port is greater than the exhaust gas circulation velocity of the exhaust gas cavity.

In order to achieve the above purpose, the utility model also provides a vehicle, which comprises an engine and the EGR air inlet structure, wherein the EGR air inlet structure is arranged on the engine.

The beneficial effects of the utility model are as follows:

according to the EGR air inlet structure provided by the utility model, the air inlet main pipe is provided with the air inlet, the air inlet branch pipes are communicated with the air inlet main pipe, the air inlet branch pipes are provided with the air outlets, and the air outlets are used for being communicated with the cylinder cover. The exhaust gas cavity is integrated to be set up in air intake manifold and air inlet branch pipe, and the exhaust gas cavity has EGR entry and EGR export, and the exhaust gas cavity passes through EGR export and air inlet branch pipe intercommunication setting, leads to the air inlet position to match different motorcycle types to change, need not to carry out the calculation of EGR misce bene, and the commonality is high. EGR waste gas enters through the waste gas cavity, and high-temperature EGR waste gas can heat the wall surface of the waste gas cavity, so that the icing risk caused by mixing of the EGR waste gas and low-temperature fresh air is reduced. And the direction of the EGR outlet is the same as the direction of the air outlet, so that the air outlet of the EGR waste gas is not influenced in the air inlet process, an additional mixer is not required to be additionally arranged on an air inlet channel of the engine, and the EGR rate is improved.

The vehicle provided by the utility model comprises an engine and an EGR air inlet structure, wherein the EGR air inlet structure is arranged on the engine. The exhaust cavity is an independent cavity and is integrally arranged on the air inlet manifold and the air inlet branch pipe, so that the position change of the air inlet is caused by matching different engines, the calculation of the mixing uniformity of the EGR is not needed, and the universality is high. The direction of the EGR outlet is the same as the direction of the air outlet, and the air inlet resistance is small, so that the air outlet of the EGR waste gas is not influenced in the air inlet process, an additional mixer is not required to be additionally arranged on an air inlet channel of the engine, and the air inlet of the engine is not influenced. Meanwhile, high-temperature EGR waste gas can heat the wall surface of the EGR air inlet structure, so that the freezing risk caused by mixing of the EGR waste gas and low-temperature fresh air is reduced, and the EGR mixing uniformity of the engine is well ensured.

Drawings

FIG. 1 is a schematic view of an EGR intake structure in an embodiment of the present utility model;

fig. 2 is a cross-sectional view of an EGR intake structure in an embodiment of the present utility model.

Reference numerals:

1. an intake manifold; 11. an air inlet;

2. an air inlet branch pipe; 21. an air outlet;

3. waste gas cavity; 31. an EGR inlet; 32. and an EGR outlet.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 to 2, in the present embodiment, the EGR intake result includes an intake manifold 1, an intake branch pipe 2, and an exhaust gas chamber 3. The air inlet manifold 1 is provided with an air inlet 11, the air inlet branch pipes 2 are communicated with the air inlet manifold 1, the air inlet branch pipes 2 are provided with air outlets 21, and the air outlets 21 are used for being communicated with a cylinder cover. The exhaust gas cavity 3 is integrally arranged on the air inlet main pipe 1 and the air inlet branch pipe 2, the exhaust gas cavity 3 is provided with an EGR inlet 31 and an EGR outlet 32, the EGR outlet 32 is communicated with the air inlet branch pipe 2, and the direction of the EGR outlet 32 is the same as the direction of the air outlet 21. Specifically, air inlet 11 has been seted up at the top of intake manifold 1, and intake branch 2 is located the below of intake manifold 1, and intake branch 2 communicates in the cylinder cap, and waste gas cavity 3 is the integrated setting in intake manifold 1 and intake branch 2 of independent cavity, and waste gas cavity 3 leads to air inlet 11 position change to matching different motorcycle types through EGR export 32 and intake branch 2 intercommunication setting, need not to carry out the calculation of EGR misce bene, and the commonality is high. EGR waste gas enters the waste gas cavity 3 through the EGR inlet 31, then enters the air inlet branch pipe 2 through the EGR outlet 32, meanwhile, fresh air enters through the air inlet 11 of the air inlet header pipe 1 and sequentially flows through the air inlet header pipe 1 and the air inlet branch pipe 2, the fresh air and the EGR waste gas are mixed in the air inlet branch pipe 2, and the mixed gas enters the cylinder cover to participate in combustion. The EGR waste gas enters through the waste gas cavity 3, and the high-temperature EGR waste gas can heat the wall surface of the waste gas cavity 3, so that the icing risk caused by mixing the EGR waste gas with low-temperature fresh air is reduced. And the direction of the EGR outlet 32 is the same as the direction of the air outlet 21, so that the air outlet of the EGR waste gas is not influenced in the air inlet process, an additional mixer is not needed to be additionally arranged on an air inlet channel of the engine, and the EGR rate is improved.

Further, with continued reference to fig. 1-2, the cross section of the waste air cavity 3 is J-shaped. Specifically, the intake manifold 1 and the intake branch pipe 2 have intake cavities that are spaced apart from the exhaust cavity 3, the exhaust cavity 3 of the J-shaped cross section matches the outer shape of the intake branch pipe 2, and EGR exhaust gas enters the exhaust cavity 3 through the EGR inlet 31 and is mixed with fresh air in the intake branch pipe 2 via the EGR outlet 32.

Further, with continued reference to fig. 1-2, the egr outlet 32 is disposed on the intake manifold 2. Specifically, taking a four-cylinder engine as an example, eight inlet channels of a cylinder cover are provided, and eight corresponding inlet branch pipes 2 are provided, so that the EGR outlets 32 are required to be arranged on the inlet branch pipes 2 corresponding to the vortex air channels, and the design difficulty is reduced on the premise of ensuring the uniformity of EGR mixing. Meanwhile, the EGR outlet 32 is close to the cylinder cover and far away from the air inlet throttle valve, so that the resistance is small, negative pressure back suction of the air inlet throttle valve is avoided, and icing caused by the reasons is avoided.

Further, with continued reference to fig. 1-2, there are a plurality of intake branch pipes 2, a plurality of intake branch pipes 2 are arranged at intervals along the length direction of the intake manifold 1, a plurality of EGR outlets 32 are arranged, and a plurality of EGR outlets 32 are arranged in one-to-one correspondence with the plurality of intake branch pipes 2. Specifically, in the present embodiment, the number of the intake branch pipes 2 is four, and the EGR outlets 32 are correspondingly provided with four, and the EGR outlets 32 are in one-to-one correspondence with the intake branch pipes 2, so that the mixing uniformity of EGR can be well ensured.

Further, with continued reference to fig. 1-2, the egr inlet 31 is disposed at an intermediate position of the intake manifold 1. Specifically, EGR exhaust gas enters from the intermediate position EGR inlet 31 of the intake manifold 1, is uniformly discharged to the plurality of EGR outlets 32 through the exhaust gas cavity 3, and is sufficiently mixed with fresh air at the intake manifold 2. Preferably, the opening direction of the intake port 11 is arranged perpendicular to the opening direction of the EGR inlet port 31 so that the EGR inlet port 31, the exhaust gas chamber 3, and the EGR outlet port 32 together form a structure having an S-shaped cross section. Preferably, the EGR inlet 31 is in the same direction as the EGR outlet 32, and the EGR inlet 31 diameter is greater than the EGR outlet 32 diameter.

Further, with continued reference to fig. 1-2, the air inlet 11 has an air inlet speed greater than the exhaust gas circulation speed of the exhaust gas cavity 3, so that a siphon effect can be formed on the EGR exhaust gas, and the EGR exhaust gas is further driven to flow out, thereby being beneficial to improving the EGR rate.

The embodiment also provides a vehicle, which comprises an engine and the EGR air inlet structure, wherein the EGR air inlet structure is arranged on the engine. Specifically, the exhaust gas cavity 3 is an independent cavity and is integrally arranged on the air inlet main pipe 1 and the air inlet branch pipe 2, so that the position of the air inlet 11 is changed when different engines are matched, calculation of EGR mixing uniformity is not needed, and the universality is high. The direction of the EGR outlet 32 is the same as the direction of the air outlet 21, so that the air outlet of the EGR waste gas is not influenced in the air inlet process, an additional mixer is not needed to be additionally arranged on an air inlet channel of the engine, and the air inlet of the engine is not influenced. Meanwhile, high-temperature EGR waste gas can heat the wall surface of the EGR air inlet structure, so that the freezing risk caused by mixing of the EGR waste gas and low-temperature fresh air is reduced, and the EGR mixing uniformity of the engine is well ensured.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

An egr intake structure, characterized by comprising:

an air inlet main pipe (1), wherein the air inlet main pipe (1) is provided with an air inlet (11);

the air inlet branch pipe (2) is communicated with the air inlet main pipe (1), the air inlet branch pipe (2) is provided with an air outlet (21), and the air outlet (21) is used for communicating a cylinder cover;

the exhaust gas cavity (3), exhaust gas cavity (3) integrated set up in intake manifold (1) with air inlet branch pipe (2), exhaust gas cavity (3) have EGR entry (31) and EGR export (32), EGR export (32) communicate in air inlet branch pipe (2), EGR export (32) direction with gas outlet (21) direction is the same.
2. EGR gas inlet structure according to claim 1, characterized in that the exhaust gas cavity (3) has a J-shaped cross section.
3. The EGR intake structure according to claim 1, characterized in that the EGR outlet (32) is provided on the intake branch pipe (2).
4. The EGR intake structure according to claim 1, wherein the number of the intake branch pipes (2) is plural, and the plural intake branch pipes (2) are arranged at intervals along the longitudinal direction of the intake manifold (1).
5. The EGR intake structure according to claim 1, characterized in that the number of the EGR outlets (32) is plural, and the plural EGR outlets (32) are provided in one-to-one correspondence with the plural intake branch pipes (2).
6. EGR gas inlet structure according to claim 1, characterized in that the EGR inlet (31) is arranged in an intermediate position of the intake manifold (1).
7. The EGR intake structure according to claim 1, characterized in that the opening direction of the intake port (11) is arranged perpendicular to the opening direction of the EGR inlet port (31).
8. The EGR intake structure according to claim 1, characterized in that the EGR inlet (31) direction is the same as the EGR outlet (32) direction.
9. EGR gas inlet structure according to claim 1, characterized in that the inlet speed of the inlet opening (11) is greater than the exhaust gas circulation speed of the exhaust gas cavity (3).
10. A vehicle comprising an engine, characterized by further comprising the EGR intake structure according to any one of claims 1-9, said EGR intake structure being provided to said engine.