CN213392430U

CN213392430U - EGR mixer capable of improving mixing uniformity

Info

Publication number: CN213392430U
Application number: CN202022454552.3U
Authority: CN
Inventors: 余超; 杨仕明; 王冲有
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-06-08
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses an improve EGR blender of mixing uniformity relates to EGR blender technical field, mainly solves the technical problem that natural air can flow back into in the EGR pipe, the utility model discloses a mixer body, this internal mixing chamber that is equipped with of mixer, the one end of mixing chamber is equipped with the air inlet, and the other end is equipped with the gas mixture export, still including passing the mixer body and extending to the EGR intake pipe of mixing intracavity, the EGR intake pipe is equipped with a plurality of air vents of evenly arranging towards one side of gas mixture export, and the bottom of EGR intake pipe is equipped with the scarf towards the gas mixture export. The utility model discloses a set up air vent, scarf towards one side of gas mixture export in the EGR intake pipe, because air vent, scarf highly compressed air inlet dorsad can form the low-pressure area, help waste gas to flow into the hybrid chamber, prevent that natural air can flow back into the EGR intake pipe, and then improve the mixing homogeneity.

Description

EGR mixer capable of improving mixing uniformity

Technical Field

The utility model relates to a EGR blender technical field, more specifically say, it relates to an improve mixing uniformity's EGR blender.

Background

Exhaust Gas Recirculation (EGR) is an effective measure to reduce NOx Gas production in the engine cylinders. The working principle is as follows: part of the exhaust gas of the engine is cooled and then sent back to the engine cylinder to participate in the combustion process. The gas composition in the combustion chamber comes from two parts, one part is fresh air cooled by an intercooler, and the other part is exhaust gas cooled by an EGR cooler after gas is taken from an exhaust manifold. The EGR mixer is used for uniformly mixing the two parts of gas, so that the problem that the gas composition in each cylinder is different due to nonuniform mixing and the combustion of each cylinder is influenced is avoided. How to design the structure of the EGR mixer is to improve the mixing efficiency of the EGR mixer as much as possible on the premise of considering cost factors, which is a problem to be faced in practical design.

In the prior art, chinese patent CN201320535712.4 discloses an EGR mixer of an EGR diesel engine, which includes a mixer inner cavity and a mixer, wherein one end of the mixer inner cavity is a natural air inlet, the other end of the mixer inner cavity is a mixed gas outlet, the mixer penetrates through a sidewall of the mixer inner cavity and is fixed, an axis of the mixer inner cavity is perpendicular to an axis of the mixer, mixer holes are uniformly formed in an annular outer wall of the mixer, the mixer holes are obliquely distributed array holes, and the mixer has a disadvantage in that holes are formed in a full circumferential direction of the mixer, and natural air is higher than exhaust gas pressure in the mixer tube, so that the natural air is poured into the EGR tube along the mixer side hole, thereby increasing pressure in the mixer tube, and causing exhaust gas to flow to a blocked air inlet tube, which affects exhaust gas flow and mixing uniformity of the whole EGR system.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is not enough to the above-mentioned of prior art, the utility model aims at providing a can improve mixing uniformity's EGR blender.

The technical scheme of the utility model is that: the utility model provides an improve EGR blender of mixing uniformity, includes the blender body, this internal mixing chamber that is equipped with of blender, the one end of mixing chamber is equipped with air inlet, and the other end is equipped with the gas mixture export, still including passing the blender body extends to EGR intake pipe in the mixing chamber, the EGR intake pipe towards one side that the gas mixture exported is equipped with a plurality of air vents of evenly arranging, the bottom of EGR intake pipe be equipped with towards the scarf of gas mixture export.

As a further improvement, the chamfer angle of the chamfer is 15-70 degrees.

Furthermore, the aperture of the vent hole is 2 mm-8 mm.

Further, the mixing cavity is of an arc-shaped structure, and the axis line of the EGR air inlet pipe is overlapped with the normal line of the arc-shaped structure.

Further, an end of the EGR inlet pipe extending toward the mixing chamber exceeds a center line of the mixing chamber.

Further, the EGR inlet pipe is located at a middle position of the mixer body.

Further, one end, far away from the mixer body, of the EGR air inlet pipe is provided with a corrugated pipe.

Further, a bent portion is arranged at the joint of the EGR air inlet pipe and the mixer body.

Further, the mixture outlet is perpendicular to the mixing chamber.

Advantageous effects

Compared with the prior art, the utility model, the advantage that has does: the utility model discloses a bottom at the EGR intake pipe sets up the scarf towards the export of gas mixture, because the scarf highly compressed air inlet dorsad, can form the low-pressure area, help waste gas to flow into the hybrid chamber, through setting up a plurality of air vents of evenly arranging in one side of EGR intake pipe towards the export of gas mixture, can form the low-pressure area equally, help waste gas to flow into the hybrid chamber, prevent that natural air from can pouring into the EGR intake pipe backward, and the air vent of evenly arranging can make waste gas homodisperse in the hybrid chamber, and then improve the homogeneity.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the three-dimensional structure of the EGR inlet tube of the present invention;

fig. 3 is the structure schematic diagram of the main view of the middle EGR intake pipe of the present invention.

Wherein: 1-mixer body, 2-mixing chamber, 3-air inlet, 4-mixed gas outlet, 5-EGR inlet pipe, 6-vent hole, 7-oblique notch, 8-corrugated pipe and 9-bending part.

Detailed Description

The invention will be further described with reference to specific embodiments shown in the drawings.

Referring to fig. 1-3, an EGR mixer for improving mixing uniformity comprises a mixer body 1, a mixing chamber 2 is arranged in the mixer body 1, an air inlet 3 is arranged at one end of the mixing chamber 2, and a mixed gas outlet 4 is arranged at the other end of the mixing chamber. The EGR mixer also comprises an EGR inlet pipe 5 which penetrates through the mixer body 1 and extends into the mixing cavity 2, one side of the EGR inlet pipe 5 facing the mixed gas outlet 4 is provided with a plurality of uniformly arranged vent holes 6, and the bottom of the EGR inlet pipe 5 is provided with a bevel cut 7 facing the mixed gas outlet 4. Because the inclined cut 7 is back to highly compressed air inlet 3, can form the low-pressure area, help waste gas to flow into mixing chamber 2, air vent 6 is back to highly compressed air inlet 3 and also can form the low-pressure area, helps waste gas to flow into mixing chamber 2, prevents that natural air from can pouring into EGR intake pipe 5 backward, and the air vent 6 of evenly arranging can make waste gas homodisperse in mixing chamber 2 in addition, and then improves mixing uniformity.

In the present embodiment, the chamfer angle α of the chamfer 7 is 15 ° to 70 °. Preferably, the chamfer angle α of the chamfer 7 is 35 ° to 45 °. The aperture of the vent hole 6 is 2mm to 8mm, and preferably, the aperture of the vent hole 6 is 5 mm.

The mixing cavity 2 is of an arc-shaped structure, and the axial lead of the EGR air inlet pipe 5 is coincided with the normal line of the arc-shaped structure. The mixing cavity 2 with the circular arc structure is easy to enable high-pressure air to form flocculation flow, and is favorable for mixing with waste gas. EGR intake pipe 5 has surpassed the central line of hybrid chamber 2 to the one end that hybrid chamber 2 extends, and EGR intake pipe 5 is closer to the subtend inner wall of hybrid chamber 2 to the one end that hybrid chamber 2 extends promptly, can make the area of air vent 6 distribution in hybrid chamber 2 big to and more even, be favorable to making waste gas homodisperse in hybrid chamber 2.

The EGR inlet pipe 5 is located at a middle position of the mixer body 1. The one end that EGR intake pipe 5 kept away from blender body 1 is equipped with bellows 8, and when the temperature of waste gas was higher, bellows 8 can play the effect of thermal expansion compensation, prevents that EGR intake pipe 5 from warping the fracture.

The junction of EGR intake pipe 5 and blender body 1 is equipped with flexion 9, makes the waste gas form the wadding flow easily, improves the mixing homogeneity. The mixture outlet 4 is perpendicular to the mixing chamber 2, and can also easily form a flocculated flow of the mixture.

The above is only a preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility of the invention and the utility of the patent.

Claims

1. The utility model provides an improve EGR blender of mixing uniformity, includes blender body (1), be equipped with hybrid chamber (2) in blender body (1), the one end of hybrid chamber (2) is equipped with air inlet (3), and the other end is equipped with gas mixture export (4), its characterized in that, still including passing blender body (1) and extend to EGR intake pipe (5) in hybrid chamber (2), EGR intake pipe (5) towards one side of gas mixture export (4) is equipped with a plurality of air vents (6) of evenly arranging, the bottom of EGR intake pipe (5) be equipped with towards bevel connection (7) of gas mixture export (4).

2. EGR mixer for improved mixing homogeneity according to claim 1, characterized in that the chamfer angle of the chamfer (7) is 15-70 °.

3. The EGR mixer of claim 1 wherein the aperture of the vent hole (6) is 2mm to 8 mm.

4. The EGR mixer for improving the mixing uniformity as recited in claim 1, characterized in that the mixing chamber (2) is a circular arc structure, and the axial center line of the EGR inlet pipe (5) coincides with the normal of the circular arc structure.

5. An EGR mixer for improving mixing uniformity according to claim 1 wherein the end of the EGR inlet pipe (5) extending towards the mixing chamber (2) exceeds the centerline of the mixing chamber (2).

6. EGR mixer for improving mixing homogeneity according to claim 1, characterized in that the EGR inlet pipe (5) is located in the middle position of the mixer body (1).

7. EGR mixer for improving mixing homogeneity according to claim 1, characterized in that the end of the EGR inlet pipe (5) remote from the mixer body (1) is provided with a bellows (8).

8. The EGR mixer for improving mixing uniformity according to claim 1, wherein a junction of the EGR inlet pipe (5) and the mixer body (1) is provided with a bent portion (9).

9. EGR mixer for improving mixing homogeneity according to claim 1, characterized in that the mixture outlet (4) is perpendicular to the mixing chamber (2).