CN214533298U - Exhaust gas recirculation mixer and engine - Google Patents
Exhaust gas recirculation mixer and engine Download PDFInfo
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- CN214533298U CN214533298U CN202022932500.2U CN202022932500U CN214533298U CN 214533298 U CN214533298 U CN 214533298U CN 202022932500 U CN202022932500 U CN 202022932500U CN 214533298 U CN214533298 U CN 214533298U
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- exhaust gas
- gas recirculation
- flow guide
- air inlet
- mixer
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Abstract
The utility model relates to an engine field discloses an exhaust gas recirculation mixer and engine, and the exhaust gas recirculation mixer includes: an air inlet main pipe and a mixing body; one end of the air inlet main pipe is an air inlet, and the other end of the air inlet main pipe is an air outlet; the air inlet main pipe is provided with an exhaust gas interface communicated with the inside; mix the body and include exhaust gas recirculation outlet duct and water conservancy diversion subassembly, exhaust gas recirculation outlet duct one end and exhaust gas interface connection, the other end stretches into the house steward inside, and exhaust gas recirculation outlet duct deviates from exhaust gas interface one end and is equipped with at least one opening, and at least one opening department installs the water conservancy diversion subassembly. Fresh air gets into from intake manifold's air inlet, and the fresh air that gets into in the intake manifold mixes through the waste gas that stretches into intake manifold's mixing body and the entering of the circulation hole from mixing body's exhaust gas recirculation outlet duct, and fresh air and waste gas pass through the water conservancy diversion subassembly and mix, have accelerated the mixing of waste gas and fresh air, and exhaust gas recirculation mixer simple structure, convenient assembling.
Description
Technical Field
The utility model relates to the technical field of engines, in particular to exhaust gas recirculation mixer and engine.
Background
With the upgrading of emission regulations, EGR (Exhaust Gas Recirculation) technology is widely used in diesel engines as a means for effectively controlling NOx emissions. Partial waste gas is introduced into the air inlet pipe from the exhaust pipe through an EGR pipeline, but the waste gas is directly introduced into the air inlet pipe and then often cannot be effectively mixed with fresh air inlet (particularly, the machine type with short mixing distance), so that the waste gas amount entering each cylinder is different, the combustion deterioration is caused, the consequences such as excessive emission are caused, and the performance of the whole machine is influenced.
Various EGR mixers have been designed to improve the mixing of EGR exhaust gas with fresh intake air and to improve the uniformity of EGR distribution among cylinders. These mixers are improving EGR and mixing the homogeneity simultaneously, because the complicated great loss of pressure that brings of structure just makes the air intake manifold divide into the multistage, or the structure is simple but is difficult to guarantee all to have better mixed effect under the different operating modes.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an exhaust gas recirculation mixer and engine for EGR mixing uniformity that has improved different operating modes under the prerequisite that does not increase inlet manifold complexity.
In order to achieve the above purpose, the utility model provides the following technical scheme:
in a first aspect, the present invention provides an exhaust gas recirculation mixer, comprising: an air inlet main pipe and a mixing body;
one end of the air inlet main pipe is an air inlet, and the other end of the air inlet main pipe is an air outlet; the air inlet main pipe is provided with an exhaust gas interface communicated with the inside;
mix the body and include exhaust gas recirculation outlet duct and water conservancy diversion subassembly, exhaust gas recirculation outlet duct one end with exhaust gas interface connection, the other end stretches into inside the inlet manifold, just exhaust gas recirculation outlet duct deviates from exhaust gas interface one end is equipped with at least one circulation hole, and at least one circulation hole department installs the water conservancy diversion subassembly.
When above-mentioned exhaust gas recirculation mixer actual assembly, install the water conservancy diversion subassembly in exhaust gas recirculation outlet duct's through-hole to exhaust gas recirculation outlet duct with adorning stretches into the inside of air intake manifold from the exhaust gas interface, and leaves exhaust gas recirculation outlet duct outside one end and exhaust gas interface connection at the air intake manifold. Above-mentioned exhaust gas recirculation mixer during operation, fresh air gets into from the air inlet of air intake manifold, and the fresh air that gets into in the air intake manifold mixes through the waste gas that stretches into the mixing body of air intake manifold and the entering of the circulation hole of the exhaust gas recirculation outlet duct from mixing body, and fresh air and waste gas pass through the water conservancy diversion subassembly and mix, have accelerateed waste gas and fresh air's mixture, and exhaust gas recirculation mixer simple structure, convenient assembling.
Optionally, at least one flow hole in which the flow guide assembly is installed is located on a side of the exhaust gas recirculation outlet pipe facing the air inlet.
Optionally, the flow guide assembly includes an inner cylinder, an outer cylinder, and a flow guide vane disposed between the inner cylinder and the outer cylinder.
Optionally, a flow hole is arranged at one end of the exhaust gas recirculation outlet pipe, which is far away from the exhaust gas interface, and the axial direction of the flow hole is coincident with the axial direction of the exhaust gas recirculation outlet pipe;
the flow guide assembly comprises a central pipe connected with the exhaust gas recirculation outlet pipe, and the central pipe is communicated with the exhaust gas recirculation outlet pipe through the circulation hole; the axial direction of the central tube is intersected with and does not coincide with the axial direction of the exhaust gas recirculation outlet tube;
at least one end of the central tube is provided with a flow guide hole, and a flow guide part is arranged at the position of the flow guide hole.
Optionally, the flow guide portion includes an inner cylinder, an outer cylinder, and a flow guide vane disposed between the inner cylinder and the outer cylinder.
Optionally, the axial direction of the central tube is parallel to the axial direction of the intake manifold.
Optionally, flow guide holes are formed in two ends of the central tube, and a flow guide part is installed at each flow guide hole.
Optionally, the exhaust gas recirculation outlet pipe is connected with the exhaust gas interface through a flange.
Optionally, the exhaust gas recirculation outlet pipe is connected with the exhaust interface in a sealing manner.
In a second aspect, the present invention also provides an engine comprising an exhaust gas recirculation mixer as described above.
Drawings
Fig. 1 is a cross-sectional view of an overall structure of an exhaust gas recirculation mixer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an intake manifold in an egr mixer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a mixing body in an egr mixer according to an embodiment of the present invention.
Icon: 1-an air inlet main pipe; 2-exhaust gas recirculation outlet pipe; 3-a central tube; 4-a flow guide part; 11-exhaust interface; 41-inner cylinder; 42-an outer cylinder; 43-guide vane.
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.
An embodiment of the utility model provides an exhaust gas recirculation mixer, include: an air inlet main pipe and a mixing body;
one end of the air inlet main pipe is an air inlet, and the other end of the air inlet main pipe is an air outlet; the air inlet main pipe is provided with an exhaust gas interface communicated with the inside;
mix the body and include exhaust gas recirculation outlet duct and water conservancy diversion subassembly, exhaust gas recirculation outlet duct one end and exhaust gas interface connection, the other end stretches into the house steward inside, and exhaust gas recirculation outlet duct deviates from exhaust gas interface one end and is equipped with at least one opening, and at least one opening department installs the water conservancy diversion subassembly.
When above-mentioned exhaust gas recirculation mixer actual assembly, install the water conservancy diversion subassembly in exhaust gas recirculation outlet duct's through-hole to exhaust gas recirculation outlet duct with adorning stretches into the inside of air intake manifold from the exhaust gas interface, and leaves exhaust gas recirculation outlet duct outside one end and exhaust gas interface connection at the air intake manifold. Above-mentioned exhaust gas recirculation mixer during operation, fresh air gets into from the air inlet of air intake manifold, and the fresh air that gets into in the air intake manifold mixes through the waste gas that stretches into the mixing body of air intake manifold and the entering of the circulation hole of the exhaust gas recirculation outlet duct from mixing body, and fresh air and waste gas pass through the water conservancy diversion subassembly and mix, have accelerateed waste gas and fresh air's mixture, and exhaust gas recirculation mixer simple structure, convenient assembling.
Optionally, at least one flow hole with a flow guide assembly is arranged on one side of the exhaust gas recirculation outlet pipe facing the air inlet.
In one possible implementation, the circulation hole provided with the flow guide assembly is positioned on one side of the exhaust gas recirculation outlet pipe facing the air inlet, so that fresh air and exhaust gas can be mixed at a first time, and the exhaust gas flow is contacted and mixed with the flow of the fresh air in a specific form through the flow guide effect of the flow guide assembly.
Optionally, the flow guiding assembly comprises an inner barrel, an outer barrel and a flow guiding vane disposed between the inner barrel and the outer barrel.
In a possible implementation mode, the outer cylinder and the inner cylinder are coaxially arranged, the guide vanes are distributed uniformly in the circumferential direction of the inner cylinder of the guide vanes, and the guide vanes guide airflow to rotate, so that the mixing strength is improved, and uniform mixing is facilitated.
Optionally, one end of the exhaust gas recirculation outlet pipe, which is far away from the exhaust gas interface, is provided with a circulation hole, and the axial direction of the circulation hole is overlapped with the axial direction of the exhaust gas recirculation outlet pipe;
the flow guide assembly comprises a central pipe connected with the exhaust gas recirculation outlet pipe, and the central pipe is communicated with the exhaust gas recirculation outlet pipe through a circulation hole; the axial direction of the central tube is intersected with and does not coincide with the axial direction of the exhaust gas recirculation outlet tube;
at least one end of the central tube is provided with a flow guide hole, and a flow guide part is arranged at the flow guide hole.
In one possible implementation, as shown in fig. 1 to 3, the exhaust gas recirculation mixer comprises: an air inlet main pipe 1 and a mixing body; one end of the air inlet main pipe 1 is an air inlet, and the other end of the air inlet main pipe is an air outlet; the air inlet main pipe 1 is provided with an exhaust gas interface 11 communicated with the inside; mix the body and include exhaust gas recirculation outlet duct 2, center tube 3 and water conservancy diversion portion 4, 2 one end of exhaust gas recirculation outlet duct are connected with exhaust gas interface 11, and the other end stretches into inside inlet manifold 1, and exhaust gas recirculation outlet duct 2 deviates from 11 one ends of exhaust gas interface and is connected with center tube 3, and 3 at least one end of center tube are equipped with the water conservancy diversion hole, and water conservancy diversion portion 4 is installed to water conservancy diversion hole department. In fig. 1, it can be seen that the central tube 3 is provided with flow guiding holes at both ends, and each flow guiding hole is provided with a flow guiding part 4. Fresh air enters from the left side of the intake manifold 1 (the front and rear connecting flanges are not included in fig. 1, and also see fig. 2), and then the fresh air in the central position of the intake manifold 1 enters the central pipe 3 through the upstream flow guide part 4 and flows out of the central pipe 3 through the downstream flow guide part 4.
The guide portion 4 includes an inner cylinder 41, an outer cylinder 42, and guide vanes 43 disposed between the inner cylinder 41 and the outer cylinder 42.
Referring to fig. 1, the axial direction of the center pipe 3 is parallel to the axial direction of the intake manifold 1.
Referring to fig. 1 and 2, two ends of the central tube 3 are provided with flow guide holes, and a flow guide part 4 is installed at each flow guide hole.
EGR airflow entering from the upper part of the exhaust gas recirculation outlet pipe 2 is mixed with fresh inlet air for the first time in the central pipe 3, and at the moment, the fresh air is coated by the EGR airflow and is mixed while rotating. This is because the upstream guide vane 43 is short, so that the fresh intake air mainly flows through the center hole of the upstream guide vane 43, and the EGR gas flow enters the area near the inner wall surface of the center tube 3.
When the mixture flows out of the central tube 3, the downstream guide vanes 43 accelerate the rotation of the mixture about the axis of the central tube 3. Then, the mixture is mixed while being swirled by the fresh air wrap outside the center pipe 3, thereby accelerating the mixing of the EGR gas flow and the fresh air.
The exhaust gas recirculation mixer adopts guide vanes 43 with different lengths to guide fresh air to be mixed with EGR airflow in a rotating mode inside and outside the EGR airflow; the EGR airflow is driven to rotate by means of the flowing inertia of the fresh air inlet, and the influence of the fresh air on the flow cross section of the EGR airflow is reduced; the guide vanes 43 and the central tube 3 are positioned with the exhaust gas recirculation outlet tube 2 to simplify the structure of the inlet manifold 1.
During actual assembly, the upstream guide vane 43 and the downstream guide vane 43 are welded together with the central tube 3 and then welded together with the exhaust gas recirculation outlet tube 2, as shown in fig. 3. The mixing body shown in fig. 3 extends from the mounting hole of the upper exhaust gas connection 11 of the intake manifold 1 and is fixed to the structure shown in fig. 1.
Optionally, the exhaust gas recirculation outlet pipe 2 is connected with the exhaust gas interface 11 through a flange. The exhaust gas recirculation outlet pipe 2 and the exhaust gas interface 11 are fixed by bolts to the structure shown in fig. 1.
In order to prevent air leakage, the exhaust gas recirculation outlet pipe 2 is hermetically connected with the exhaust gas interface 11. Specifically, the exhaust gas recirculation outlet pipe 2 is connected with the exhaust gas interface 11 in a sealing manner through a sealing gasket.
In the exhaust gas recirculation mixer provided by the embodiment of the utility model, fresh air is contacted and mixed with EGR airflow at the inner side and the outer side of the EGR airflow; the guide vanes are adopted to guide the airflow to rotate so as to strengthen the mixing process, and the rotating motion is aided by the flowing inertia of the fresh air flowing into the central pipe; without adding complexity to the intake manifold.
Embodiments of the present invention also provide an engine, including any of the above exhaust gas recirculation mixers.
It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An exhaust gas recirculation mixer, comprising: an air inlet main pipe and a mixing body;
one end of the air inlet main pipe is an air inlet, and the other end of the air inlet main pipe is an air outlet; the air inlet main pipe is provided with an exhaust gas interface communicated with the inside;
mix the body and include exhaust gas recirculation outlet duct and water conservancy diversion subassembly, exhaust gas recirculation outlet duct one end with exhaust gas interface connection, the other end stretches into inside the inlet manifold, just exhaust gas recirculation outlet duct deviates from exhaust gas interface one end is equipped with at least one circulation hole, and at least one circulation hole department installs the water conservancy diversion subassembly.
2. The egr mixer of claim 1 wherein at least one flow aperture in which the flow directing assembly is mounted is located on a side of the egr outlet tube facing the inlet.
3. The exhaust gas recirculation mixer of claim 2, wherein the flow guide assembly comprises an inner barrel, an outer barrel, and a flow guide vane disposed between the inner barrel and the outer barrel.
4. The exhaust gas recirculation mixer according to claim 1, wherein a flow hole is formed at an end of the exhaust gas recirculation outlet pipe, which is away from the exhaust gas connection port, and an axial direction of the flow hole coincides with an axial direction of the exhaust gas recirculation outlet pipe;
the flow guide assembly comprises a central pipe connected with the exhaust gas recirculation outlet pipe, and the central pipe is communicated with the exhaust gas recirculation outlet pipe through the circulation hole; the axial direction of the central tube is intersected with and does not coincide with the axial direction of the exhaust gas recirculation outlet tube;
at least one end of the central tube is provided with a flow guide hole, and a flow guide part is arranged at the position of the flow guide hole.
5. The exhaust gas recirculation mixer of claim 4, wherein the flow guide comprises an inner barrel, an outer barrel, and a flow guide vane disposed between the inner barrel and the outer barrel.
6. The exhaust gas recirculation mixer according to claim 4, wherein an axial direction of the center pipe is parallel to an axial direction of the intake manifold.
7. The egr mixer of claim 6 wherein the central tube has flow guide holes at both ends, and a flow guide is mounted at each of the flow guide holes.
8. The egr mixer of claim 1 wherein the egr outlet pipe is flanged to the egr port.
9. The egr mixer of claim 1 wherein the egr outlet pipe is sealingly connected to the egr port.
10. An engine comprising an exhaust gas recirculation mixer according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022932500.2U CN214533298U (en) | 2020-12-07 | 2020-12-07 | Exhaust gas recirculation mixer and engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022932500.2U CN214533298U (en) | 2020-12-07 | 2020-12-07 | Exhaust gas recirculation mixer and engine |
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| Publication Number | Publication Date |
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| CN214533298U true CN214533298U (en) | 2021-10-29 |
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| CN202022932500.2U Active CN214533298U (en) | 2020-12-07 | 2020-12-07 | Exhaust gas recirculation mixer and engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542335A (en) * | 2022-02-26 | 2022-05-27 | 重庆长安汽车股份有限公司 | Low-pressure EGR (exhaust gas recirculation) mixed structure of gasoline supercharged engine |
| CN114673611A (en) * | 2022-04-14 | 2022-06-28 | 中国第一汽车股份有限公司 | Exhaust gas recirculation mixing device, exhaust gas recirculation system and vehicle |
-
2020
- 2020-12-07 CN CN202022932500.2U patent/CN214533298U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542335A (en) * | 2022-02-26 | 2022-05-27 | 重庆长安汽车股份有限公司 | Low-pressure EGR (exhaust gas recirculation) mixed structure of gasoline supercharged engine |
| CN114542335B (en) * | 2022-02-26 | 2023-09-08 | 重庆长安汽车股份有限公司 | Low-pressure EGR (exhaust gas recirculation) mixing structure of gasoline supercharged engine |
| CN114673611A (en) * | 2022-04-14 | 2022-06-28 | 中国第一汽车股份有限公司 | Exhaust gas recirculation mixing device, exhaust gas recirculation system and vehicle |
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