CN212716934U

CN212716934U - Automobile, engine and EGR mixing device thereof

Info

Publication number: CN212716934U
Application number: CN202021307826.XU
Authority: CN
Inventors: 闫乐乐; 唐帅; 王俊莉; 李俊琦
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2021-03-16
Anticipated expiration: 2030-07-06

Abstract

The utility model discloses an automobile, engine and EGR mixing arrangement thereof, include: a hollow mixer body; the fresh air inlet pipe is communicated with the air inlet of the mixer main body in a sealing way, and the fresh air inlet pipe is arranged opposite to the mixed gas outlet of the mixer main body; the EGR air inlet pipe is communicated with the exhaust gas inlet of the mixer main body in a sealing mode, the EGR air inlet pipe is obliquely arranged relative to a plane where the mixed gas outlet is located, and the oblique direction is that the EGR air inlet pipe gradually approaches the mixer main body from the fresh air inlet pipe to the direction of the mixed gas outlet. The direction of admitting air of EGR waste gas is crossed with the direction that fresh air admitted air to realize the vortex, improve mixed effect, the direction of admitting air of EGR waste gas is to the export orientation slope of mist, so that better with the gas direction mist export of mixing. The EGR air inlet pipe is obliquely arranged to replace a spoiler and a small hole, and EGR throttling loss and air inlet pressure loss are reduced on the premise that the turbulence is realized to ensure the mixing effect.

Description

Automobile, engine and EGR mixing device thereof

Technical Field

The utility model relates to an engine technology field, in particular to car and engine, more particularly relate to an EGR mixing arrangement.

Background

Exhaust Gas Recirculation (EGR), a technique in which a part of Exhaust Gas is introduced into intake air after combustion in an internal combustion engine for an automobile to be re-combusted, can reduce nitrogen oxides (NOx) in Exhaust Gas and improve fuel economy.

The uniformity of mixing of fresh air and EGR has a significant impact on the dynamics, economy, emissions, etc. of diesel engines. In the air intake process of the engine, if the mixed gas is not uniformly distributed, the gas quantity distributed to each cylinder through the air inlet pipe is inconsistent, and the problems of poor working consistency, poor combustion effect and the like of each cylinder of the engine are inevitably caused. Therefore, the homogeneity of the mixture is one of the important indicators for evaluating the mixer.

At present, in the existing EGR mixer, a spoiler is usually arranged at the joint of the mixer body and the mixer adapter or a small hole is arranged on the mixer adapter to realize turbulence and improve the mixing effect. However, the addition of either a spoiler or a small hole results in large flow losses, which reduces the charging efficiency of the engine.

Therefore, how to provide an EGR mixing device, which can reduce the EGR throttling loss and the intake pressure loss and ensure the mixing effect at the same time, is a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a EGR mixing arrangement guarantees to mix the effect when reducing EGR throttle loss and intake pressure loss. Furthermore, the utility model also provides an engine and car that have above-mentioned EGR mixing arrangement.

In order to achieve the above object, the utility model provides a following technical scheme:

an EGR mixing device, comprising:

a hollow mixer body;

the fresh air inlet pipe is communicated with the air inlet of the mixer main body in a sealing mode, and the fresh air inlet pipe is arranged opposite to the mixed gas outlet of the mixer main body;

the EGR intake pipe, the EGR intake pipe with the sealed intercommunication of exhaust gas entry of blender main part, the EGR intake pipe for the plane slope arrangement in mist outlet place, and the incline direction be by fresh air intake pipe to the direction of mist outlet is close to gradually the blender main part.

Preferably, among the foretell EGR mixing arrangement, the air inlet department of blender main part is provided with the fresh air entry flange that is used for with fresh air intake-tube connection, the exhaust gas entrance department of blender main part be provided with be used for with EGR intake-tube connection's EGR waste gas entry flange, the mixed gas exit be provided with be used for with the intake-tube connection's of engine mixed gas export flange.

Preferably, in the EGR mixer, the mixer body, the fresh air inlet flange, the EGR exhaust gas inlet flange, and the mixed gas outlet flange are integrally formed.

Preferably, in the EGR mixer, the mixer body, the fresh air inlet flange, the EGR exhaust gas inlet flange, and the mixed gas outlet flange are made of cast aluminum or plastic.

Preferably, in the EGR mixer, an area of a flow surface of the mixed gas outlet is larger than a sum of an area of a flow surface of the air inlet and an area of a flow surface of the exhaust gas inlet.

Preferably, in the EGR mixer described above, an inclination angle of the EGR inlet pipe with respect to a plane in which the mixed gas outlet is located is 30 ° to 60 °.

An engine comprising an EGR mixing device, wherein the EGR mixing device is any one of the EGR mixing devices described above.

An automobile comprises an engine, wherein the engine is the engine.

The utility model provides a pair of EGR mixing arrangement, the direction of admitting air of EGR waste gas is alternately with the direction that fresh air admits air to realize the vortex, improve mixed effect, the direction of admitting air of EGR waste gas is to the export orientation slope of mist, so that the better gas direction mist that will mix exports. Adopt in this application to arrange EGR intake pipe slope in order to replace spoiler and aperture's effect, under the prerequisite that realizes the vortex and guarantee to mix the effect, also reduced EGR throttling loss and inlet pressure loss.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a mixer main body in an embodiment of the present invention;

fig. 2 is a front cross-sectional view of a mixer body in an embodiment of the invention;

fig. 3 is a schematic structural diagram of an EGR mixing device according to an embodiment of the present invention;

fig. 4 is a front cross-sectional view of the EGR mixing device in the embodiment of the present invention.

Detailed Description

The utility model discloses a EGR mixing arrangement guarantees to mix the effect when reducing EGR throttle loss and intake pressure loss. Furthermore, the utility model also discloses an engine and car of having above-mentioned EGR mixing arrangement.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-4, the present application further discloses an EGR mixing device comprising: a mixer body 4, a fresh air intake pipe 5, and an EGR intake pipe 6, wherein the mixer body 4 is of a hollow structure and has an air inlet, an exhaust gas inlet, and a mixed gas outlet communicating with the hollow portion. Specifically, the fresh air intake pipe 5 is in sealed communication with an air inlet of the mixer body 4, the EGR intake pipe 6 is in sealed communication with an exhaust gas inlet of the mixer body 4, and the mixed gas outlet is used for connecting an intake pipe 7 of the engine. The emphasis in this application is that the fresh air intake pipe 5 is arranged opposite the mixed gas outlet of the mixer body 4, while the EGR intake pipe 6 is arranged obliquely with respect to the plane in which the mixed gas outlet is located, and the inclination direction is such that it gradually approaches the mixer body 4 from the fresh air intake pipe 5 to the direction of the mixed gas outlet. The direction of admitting air of EGR waste gas is crossing with the direction that fresh air admitted air promptly to realize the vortex, improve mixed effect, the direction of admitting air of EGR waste gas is to the export orientation slope of mist, so that better with the gas direction mist outlet who mixes. Adopt in this application to arrange 6 slopes of EGR intake pipe in order to replace spoiler and aperture's effect, under the prerequisite that realizes the vortex and guarantee to mix the effect, also reduced EGR throttling loss and inlet pressure loss.

In a specific embodiment, a fresh air inlet flange 1 for connecting with a fresh air inlet pipe 5 is arranged at an air inlet of the mixer main body 4, an EGR exhaust gas inlet flange 2 for connecting with an EGR inlet pipe 6 is arranged at an exhaust gas inlet of the mixer main body 4, and a mixed gas outlet flange 3 for connecting with an air inlet pipe 7 of an engine is arranged at a mixed gas outlet. In practice, the fresh air inlet pipe 5 is connected with the fresh air inlet flange 1 through a flange or other structures, and the sealing effect needs to be ensured; the EGR gas inlet pipe 6 is hermetically connected with the EGR waste gas inlet flange 2 through a flange or other structures; the gas inlet pipe 7 is hermetically connected with the mixed gas outlet flange 3 through a flange or other structures. The connection mode can be set according to different requirements and is within the protection range.

In a preferred embodiment, the mixer body 4, the fresh air inlet flange 1, the EGR gas inlet flange 2 and the mixed gas outlet flange 3 are integrally formed. Adopt integrated into one piece's structure, can guarantee joint strength, simplify the installation. In practice, it is also possible to use a separate construction, which is assembled together during use.

In practice, the mixer body 4, the fresh air inlet flange 1, the EGR exhaust gas inlet flange 2 and the mixed gas outlet flange 3 described above may be provided as cast aluminum or plastic parts. The material of the EGR mixer can be set according to different requirements and is within a protection range.

On the basis of the above technical solution, in order to prolong the mixing time, the flow surface area C of the mixed gas outlet is set to be larger than the sum of the flow surface area a of the air inlet and the flow surface area B of the exhaust gas inlet. The fresh air and EGR gases flow from the relatively small flow area line into the relatively large volume of the mixer body 4, which is significantly slower, and thus the mixing time can be extended. When each cylinder inhales, the mixed gas which is mixed for a long time is inhaled, and the mixing effect is good. In addition, the fresh air inlet flow surface area A and the EGR exhaust gas inlet flow surface area B are calculated according to one-dimensional thermodynamic simulation, and the mixed gas outlet flow surface area C is relatively larger than the fresh air inlet flow surface area A and the EGR exhaust gas inlet flow surface area B, so that the gas flow speed is reduced, and the mixing time is prolonged. The flow surface area in this application may be a cross-sectional area.

Specifically, the above-mentioned EGR inlet pipe 6 is inclined at an angle of 30 to 60 degrees with respect to the plane in which the mixed gas outlet is located. The specific size of the inclination angle can be set according to different requirements and is within the protection range.

In addition, this application still discloses an engine, including EGR mixing arrangement, wherein, this EGR mixing arrangement is as disclosed in above-mentioned embodiment's EGR mixing arrangement, therefore, the engine that has this EGR mixing arrangement also has above-mentioned all technological effects, and the no longer repeated description is given here.

In addition, the application also discloses an automobile which comprises the engine disclosed in the embodiment, so that the automobile also has all the technical effects.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An EGR mixing device, comprising:

a hollow mixer body (4);

a fresh air inlet pipe (5), wherein the fresh air inlet pipe (5) is in sealed communication with an air inlet of the mixer main body (4), and the fresh air inlet pipe (5) is arranged opposite to a mixed gas outlet of the mixer main body (4);

EGR intake pipe (6), EGR intake pipe (6) with the sealed intercommunication of exhaust gas entry of blender main part (4), EGR intake pipe (6) for the mixed gas export place plane slope is arranged, and the incline direction be by fresh air intake pipe (5) to the direction of mixed gas export is close to gradually blender main part (4).

2. The EGR mixing device according to claim 1, wherein a fresh air inlet flange (1) for connection with a fresh air intake pipe (5) is provided at an air inlet of the mixer body (4), an EGR exhaust gas inlet flange (2) for connection with the EGR intake pipe (6) is provided at an exhaust gas inlet of the mixer body (4), and a mixed gas outlet flange (3) for connection with an intake pipe (7) of an engine is provided at the mixed gas outlet.

3. The EGR mixing device of claim 2 wherein the mixer body (4), the fresh air inlet flange (1), the EGR exhaust gas inlet flange (2) and the mixed gas outlet flange (3) are of unitary construction.

4. The EGR mixing device according to claim 3, wherein the mixer body (4), the fresh air inlet flange (1), the EGR exhaust gas inlet flange (2) and the mixed gas outlet flange (3) are cast aluminum or plastic pieces.

5. The EGR mixing device of claim 1, wherein the mixed gas outlet has a flow area greater than the sum of the air inlet flow area and the exhaust gas inlet flow area.

6. The EGR mixing device according to claim 1, wherein the angle of inclination of the EGR gas intake pipe (6) with respect to the plane in which the mixed gas outlet is located is 30 ° to 60 °.

7. An engine comprising an EGR mixing device, wherein the EGR mixing device is an EGR mixing device as defined in any one of claims 1-6.

8. An automobile comprising an engine, wherein the engine is the engine of claim 7.