CN213493036U

CN213493036U - EGR (exhaust gas Recirculation) mixer

Info

Publication number: CN213493036U
Application number: CN202021936682.4U
Authority: CN
Inventors: 孙振宇; 沈健; 庞斌; 周鹏
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-06-22
Anticipated expiration: 2030-09-07

Abstract

The utility model discloses a EGR blender, including the blender inner chamber, the lateral wall of blender inner chamber is provided with the EGR inlet port that is used for letting in EGR gas, form first venturi structure between the inlet end of EGR inlet port to the end of giving vent to anger. The inlet port of this scheme utilization venturi structure carries out breakage, atomizing to the condensation water droplet, avoids the damage of large granule drop of water to compressor impeller, has improved complete machine life. The scheme has simple structure, is convenient to arrange, is easy to replace and maintain, and does not influence the original arrangement form of the whole machine.

Description

EGR (exhaust gas Recirculation) mixer

Technical Field

The utility model relates to the technical field of engines, especially, relate to an EGR blender.

Background

With the increasing strictness of emission regulations and the rising of fuel prices, related departments and customers begin to pay more attention to the problems of engine emission and energy conservation and consumption reduction in the competition of vehicle power systems. The Exhaust Gas Recirculation (EGR) technology can effectively reduce emissions, and the current EGR technology can be divided into high-pressure EGR and low-pressure EGR. And taking exhaust gas from the front of the turbine by high-pressure EGR, entering the compressor through a high-pressure EGR cooler, and mixing the exhaust gas with fresh air through a pipeline. The gas taking position of the low-pressure EGR pipeline is positioned on the pipeline behind the turbine, and the low-pressure EGR pipeline is mixed with fresh air before entering the compressor through the low-pressure EGR cooler and then enters the compressor. However, since EGR is a product of combustion and contains a large amount of water vapor, a large amount of condensed water drops are precipitated during cooling, and if the condensed water drops directly enter the compressor, the compressor wheel is damaged to different degrees, and the supercharger is seriously damaged.

In the prior art, the EGR mixer is optimized only in the aspects of improving the mixing mode and increasing the EGR rate, and the EGR mixer can be used for high-pressure EGR, but the problem that the compressor impeller is damaged by low-pressure EGR condensed water drops cannot be solved.

Therefore, how to solve the problem that water drops in low-pressure EGR damage the compressor impeller is a technical problem which needs to be solved by the technical personnel in the field at present.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a EGR blender, this blender can also play the atomizing effect to the condensate water droplet in the low pressure EGR when having good mixed effect to reduce the damage of comdenstion water to the compressor impeller.

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

the utility model provides a EGR blender, includes the blender inner chamber, the lateral wall of blender inner chamber is provided with the EGR inlet port that is used for letting in EGR gas, form first venturi structure between the inlet end of EGR inlet port to the end of giving vent to anger.

Preferably, a second venturi structure is formed between the gas inlet end and the gas outlet end of the inner cavity of the mixer.

Preferably, the EGR gas inlet aperture is arranged circumferentially of the throat section of the second venturi structure.

Preferably, the maximum internal diameter of the first venturi structure is less than the minimum internal diameter of the second venturi structure.

Preferably, the axial direction of the EGR gas inlet hole is arranged perpendicular to the axial direction of the throat section of the second venturi structure.

Preferably, a plurality of EGR air inlet holes are distributed on the periphery of the inner cavity of the mixer.

Preferably, a plurality of the EGR gas inlet holes are uniformly distributed along the circumferential direction of the mixer inner chamber.

Preferably, the EGR mixer described above further includes a mixer outer chamber surrounding an outer periphery of the mixer inner chamber, the mixer outer chamber being provided with an EGR introduction port, the mixer outer chamber communicating with the mixer inner chamber through the EGR gas inlet hole.

Preferably, the EGR introduction port is disposed opposite to the EGR intake hole.

Preferably, the mixer inner cavity and the mixer outer cavity are both of a cylindrical structure, the mixer outer cavity is coaxially sleeved on the periphery of the mixer inner cavity, a positioning chamfer for positioning the end part of the mixer inner cavity is arranged on the inner wall of the mixer outer cavity, and a flange for fixing the other end of the mixer inner cavity is arranged at the end part of the mixer outer cavity.

The utility model provides a EGR blender, including the blender inner chamber, the lateral wall of blender inner chamber is provided with the EGR inlet port that is used for letting in EGR gas, form first venturi structure between the inlet end of EGR inlet port to the end of giving vent to anger.

The working principle of the scheme is as follows:

when the EGR mixer works, fresh air enters the inner cavity of the mixer from one end of the inner cavity of the mixer, EGR gas enters the outer cavity of the mixer through the EGR introducing pipe and then enters the inner cavity of the mixer through the EGR gas inlet hole, when the EGR gas flows through the first Venturi tube structure of the EGR gas inlet hole, gas flow is accelerated, condensed water carried in the EGR gas is atomized into fine liquid drops under the action of high air flow speed and shearing force at the throat of the first Venturi tube structure, and finally the fine liquid drops enter the inner cavity of the mixer along with the EGR gas. Because water drops in the EGR gas are atomized into fine liquid drops, the damage of condensed water drops to the compressor impeller is reduced.

It is obvious that this scheme utilizes the inlet port of venturi structure to carry out breakage, atomizing to the condensation water droplet, avoids the damage of large granule drop of water to compressor impeller, has improved complete machine life. The scheme has simple structure, is convenient to arrange, is easy to replace and maintain, and does not influence the original arrangement form of the whole machine.

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 diagram of an internal configuration of an EGR mixer in an embodiment of the present invention;

fig. 2 is a schematic diagram of an external structure of an EGR mixer according to an embodiment of the present invention.

The meaning of the respective reference numerals of fig. 1 and 2 is:

1-mixer outer cavity, 11-EGR introduction port, 12-flange, 13-positioning chamfer, 2-mixer inner cavity, 21-EGR gas inlet hole, 22-throat section, 100-EGR gas, 200-fresh air and 300-mixed gas.

Detailed Description

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.

Referring to fig. 1 and 2, fig. 1 is a schematic diagram of an internal structure of an EGR mixer according to an embodiment of the present invention; fig. 2 is a schematic diagram of an external structure of an EGR mixer according to an embodiment of the present invention. In fig. 1 and 2, black arrows represent the EGR gas 100, white open arrows represent the fresh air 200, and arrows with grid filling represent the mixed gas 300.

The utility model provides a EGR blender, including blender inner chamber 2, blender inner chamber 2's lateral wall is provided with the EGR inlet port 21 that is used for letting in EGR gas, and the inlet end of EGR inlet port 21 forms first venturi structure to giving vent to anger between the end.

The working principle of the scheme is as follows:

when the EGR mixer works, fresh air 200 enters the mixer inner cavity 2 from the inlet end of the mixer inner cavity 2, EGR gas 100 enters the mixer outer cavity 1 through the EGR introducing pipe and then enters the mixer inner cavity 2 through the EGR gas inlet hole 21, when the EGR gas 100 flows through the first Venturi tube structure of the EGR gas inlet hole 21, gas flow is accelerated, condensed water drops carried in the EGR gas 100 are atomized into fine liquid drops under the action of high gas flow speed and shearing force at the throat of the first Venturi tube structure, and finally enter the mixer inner cavity 2 along with the EGR gas 100, the EGR gas 100 is mixed with the fresh air 200 to form mixed gas 300, and the mixed gas 300 flows out from the outlet end of the mixer inner cavity 2 and then enters the gas inlet pipe. Since the water droplets in the EGR gas 100 are atomized into fine droplets, damage of the compressor impeller by the condensed water droplets is reduced.

It is thus clear that this scheme utilizes the EGR inlet port 21 of venturi structure to carry out breakage, atomizing to the condensation water droplet, avoids the damage of large granule drop of water to the compressor impeller, has improved complete machine life. The scheme has simple structure, is convenient to arrange, is easy to replace and maintain, and does not influence the original arrangement form of the whole machine.

Preferably, a second venturi structure is formed between the inlet end and the outlet end of the mixer cavity 2. So set up, after EGR gas 100 entered into mixer inner chamber 2 through EGR inlet port 21, utilize the gas impact effect of second venturi structure throat department to realize the secondary atomizing to the liquid droplet to further reduce the damage of water droplet to the compressor impeller. In addition, due to the venturi effect of the mixer inner cavity 2, the air flow speed of the fresh air 200 flowing through the second venturi tube structure is increased, the static pressure is reduced, the pressure difference between the EGR air inlet hole 21 and the second venturi tube structure is increased, the EGR gas taking capacity is enhanced, and the mixing effect and the mixing efficiency of the EGR gas 100 and the fresh air 200 are improved.

Further preferably, the EGR inlet holes 21 are arranged in the circumferential direction of the throat section 22 of the second venturi structure. With this arrangement, the EGR gas 100 directly enters the throat section 22 of the second venturi structure after passing through the EGR gas inlet hole 21, the air flow speed at the throat section 22 is maximum, and the static pressure is minimum, so that the EGR gas 100 can more easily enter the mixer cavity 2 to be mixed with the fresh air 200.

Preferably, the axial direction of the EGR inlet hole 21 is arranged perpendicular to the axial direction of the throat section 22 of the second venturi structure. So arranged, the EGR gas 100 can be mixed with the fresh air 200 to the maximum extent, enhancing the mixing effect.

Preferably, a plurality of EGR air inlet holes 21 are distributed on the circumference of the mixer inner cavity 2. Further preferably, the plurality of EGR inlet holes 21 are evenly distributed along the circumferential direction of the mixer inner chamber 2.

Preferably, the above EGR mixer further comprises an outer mixer chamber 1 surrounding the outer periphery of the inner mixer chamber 2, the outer mixer chamber 1 being provided with an EGR introduction port 11, the outer mixer chamber 1 communicating with the inner mixer chamber 2 through an EGR gas inlet port 21. Specifically, an annularly arranged cavity is formed between the inner wall of the outer mixer chamber 1 and the outer wall of the inner mixer chamber 2, and the EGR introduction port 11 is adapted to be connected to an EGR introduction pipe to introduce the EGR gas 100.

Preferably, the EGR introduction port 11 is disposed opposite to the EGR intake port 21. So arranged, the EGR gas 100 can be more easily introduced into the mixer internal chamber 2 along the EGR gas inlet hole 21.

Preferably, the mixer inner cavity 2 and the mixer outer cavity 1 are both of a cylindrical structure, the mixer outer cavity 1 is coaxially sleeved on the periphery of the mixer inner cavity 2, as shown in fig. 1, the inner wall of the mixer outer cavity 1 is provided with a positioning chamfer 13 for positioning the end part of the mixer inner cavity 2, and the end part of the mixer outer cavity 1 is provided with a flange 12 for fixing the other end of the mixer inner cavity 2. When the EGR mixer is assembled, the mixer inner cavity 2 is plugged from one end of the mixer outer cavity 1, the inner end of the mixer inner cavity 2 is abutted to the positioning chamfer 13 to realize positioning, the outer end of the mixer inner cavity 2 is located at the position of the flange 12, and after the flange 12 is fixed with the air inlet pipe, the mixer inner cavity 2 can be fixed inside the mixer outer cavity 1. The structure is convenient to install, replace and maintain.

The utility model discloses following beneficial effect has:

1) the scheme can play a role in crushing and atomizing the condensed water in the low-pressure EGR, reduce the damage of water drops to the impeller of the compressor and prolong the service life of the whole machine;

2) the scheme can also carry out secondary atomization on water drops through the secondary Venturi structure, further accelerate air flow, improve the EGR gas taking capacity and enable EGR gas and fresh air to be fully mixed and then enter the gas compressor;

3) the EGR mixer provided by the scheme has the advantages of simple structure, high reliability, easiness in disassembly and maintenance and no influence on the original arrangement form of the whole mixer.

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. The EGR mixer comprises a mixer inner cavity (2), and is characterized in that an EGR air inlet hole (21) used for introducing EGR gas is formed in the side wall of the mixer inner cavity (2), and a first Venturi tube structure is formed between the air inlet end and the air outlet end of the EGR air inlet hole (21).

2. An EGR mixer according to claim 1, characterized in that a second venturi structure is formed between the inlet end and the outlet end of the mixer inner chamber (2).

3. An EGR mixer according to claim 2, characterized in that the EGR gas inlet aperture (21) is arranged in the circumferential direction of the throat section (22) of the second venturi structure.

4. The EGR mixer of claim 3, wherein a maximum inner diameter of the first venturi structure is less than a minimum inner diameter of the second venturi structure.

5. An EGR mixer according to claim 3, characterized in that the axial direction of the EGR inlet aperture (21) is arranged perpendicular to the axial direction of the throat section (22) of the second venturi structure.

6. The EGR mixer according to claim 1, wherein a plurality of the EGR gas inlet holes (21) are circumferentially distributed in the mixer inner chamber (2).

7. The EGR mixer according to claim 6, wherein a plurality of the EGR inlet holes (21) are evenly distributed along a circumferential direction of the mixer inner chamber (2).

8. The EGR mixer according to any of claims 1 to 7, further comprising an outer mixer chamber (1) surrounding the outer periphery of the inner mixer chamber (2), the outer mixer chamber (1) being provided with an EGR introduction port (11), the outer mixer chamber (1) communicating with the inner mixer chamber (2) through the EGR intake port (21).

9. The EGR mixer according to claim 8, wherein the EGR introduction port (11) is disposed opposite to the EGR intake hole (21).

10. The EGR mixer according to claim 8, characterized in that the mixer inner cavity (2) and the mixer outer cavity (1) are both cylindrical structures, the mixer outer cavity (1) is coaxially sleeved on the periphery of the mixer inner cavity (2), the inner wall of the mixer outer cavity (1) is provided with a positioning chamfer (13) for positioning the end of the mixer inner cavity (2), and the end of the mixer outer cavity (1) is provided with a flange (12) for fixing the other end of the mixer inner cavity (2).