EGR mixer and engine
By designing an opening group in the exhaust gas intake pipe in the EGR mixer, the exhaust gas is driven into the through hole by air flow, which solves the problem of uneven mixing, improves the mixing effect and combustion efficiency of the engine, and improves the engine's power and emission performance.
Patent Information
- Application Number
- CN202520112792.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-17
AI Technical Summary
Existing EGR mixers have poor mixing performance during the air-exhaust gas mixing process, resulting in poor consistency of operation among engine cylinders and poor combustion.
An EGR mixer was designed with two openings in the exhaust gas inlet pipe. The angle between the centerline of the opening and the centerline of the first through hole is a preset value. The openings face away from the intake end. The air flow drives the exhaust gas into the through hole, improving the mixing effect, and no booster is required.
It improves the uniformity of air-exhaust gas mixing, enhances engine power and emissions performance, and reduces reliance on turbochargers.
Smart Images
Figure CN223825142U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine technology, and more particularly to an EGR mixer and engine. Background Technology
[0002] The uniformity of air-to-exhaust gas mixing has a significant impact on engine power, fuel economy, and emissions. During the engine's intake process, uneven mixture distribution, resulting in inconsistent gas volume allocated to each cylinder via the intake manifold, inevitably leads to poor cylinder performance and inefficient combustion. Therefore, mixture uniformity is a crucial indicator for evaluating a gas mixer. Currently, air and exhaust gas are mixed using an EGR mixer. EGR (Exhaust Gas Recirculation) is a technology in automotive internal combustion engines that reintroduces a portion of exhaust gas into the intake air for re-combustion after combustion. This reduces nitrogen oxides in the exhaust gases and improves fuel economy.
[0003] Improving the mixing performance of EGR mixers has become an urgent problem to be solved. Utility Model Content
[0004] In view of this, the present invention provides an EGR mixer and an engine, wherein the EGR mixer can ensure a high mixing effect.
[0005] In a first aspect, the EGR mixer provided in this embodiment of the present invention includes a base and an exhaust gas inlet pipe; the base has a first through hole for introducing air, the first through hole penetrating the base along its thickness direction, and a first end of the exhaust gas inlet pipe passing through the base and communicating with the first through hole, wherein:
[0006] The first end of the exhaust gas inlet pipe has at least one set of openings, each set of openings includes two openings, the two openings are spaced apart, the angle between the center line of the opening and the center line of the first through hole is a preset value, and the opening faces the air inlet end away from the first through hole.
[0007] In the EGR mixer of this application, exhaust gas from the exhaust gas inlet pipe flows into a first through-hole through at least one group of openings. Each group of openings includes two openings spaced apart, with the centerline of each opening forming a preset angle with the centerline of the first through-hole, and the openings facing away from the intake end of the first through-hole. Thus, as the air in the first through-hole flows from the intake end, the exhaust gas in the two openings is downstream of the airflow direction in the first through-hole, which can drive the exhaust gas from the exhaust gas inlet pipe to flow into the first through-hole through the two openings, thereby improving the mixing effect of the EGR mixer. Furthermore, since the airflow can carry the exhaust gas flowing out through the openings, a suitable turbocharger is not required during the exhaust gas mixing process.
[0008] In one embodiment, the preset value is any value between 45° and 75°.
[0009] In one embodiment, there are multiple opening groups, and the multiple opening groups are distributed at intervals along the axial direction of the exhaust gas inlet pipe.
[0010] In one embodiment, the base further has a second through hole, which communicates with the first through hole, and the exhaust gas inlet pipe passes through the second through hole and communicates with the first through hole.
[0011] In one embodiment, the axis of the second through hole is perpendicular to the axis of the first through hole.
[0012] In one embodiment, the two openings are symmetrically arranged along the centerline of the first through hole.
[0013] In one embodiment, a gap exists between the opening and the inner wall of the first through hole.
[0014] In one embodiment, there is a gap between the end of the first end of the exhaust gas inlet pipe and the inner wall of the first through hole.
[0015] In one embodiment, each of the aperture groups includes two apertures of the same size.
[0016] Secondly, an embodiment of this utility model provides an engine that includes an EGR mixer as described in any of the technical solutions of the first aspect. Since the technical effects produced by this engine are the same as those of the EGR mixer, further details are omitted here. Attached Figure Description
[0017] Figure 1 A partial structural schematic diagram of an EGR mixer provided in an embodiment of this utility model;
[0018] Figure 2 A top view of the EGR mixer provided in an embodiment of this utility model;
[0019] Figure 3 for Figure 2 Sectional view of AA;
[0020] Figure 4 for Figure 3 A cross-sectional view of BB.
[0021] Icons: 10-Base; 11-First through hole; 20-Exhaust gas inlet pipe; 21-Opening group; 210-Opening. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] The EGR mixer provided in the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0024] Figure 1 A partial structural schematic diagram of an EGR mixer provided in an embodiment of this utility model; Figure 2 A top view of the EGR mixer provided in an embodiment of this utility model; Figure 3 for Figure 2 Sectional view of AA; Figure 4 for Figure 3 A cross-sectional view of BB. Figure 1 and Figure 3 The direction of the middle arrow indicates the direction of airflow. Figure 4 In the diagram, 'a' represents the airflow direction, 'b' represents the exhaust gas flow direction, and 'c' represents the axis of the opening. (Refer to...) Figure 1 , Figure 2 , Figure 3 and Figure 4 The EGR mixer provided in this application embodiment includes a base 10 and an exhaust gas inlet pipe 20. The base 10 has a first through hole 11 for introducing air. The first through hole 11 penetrates the base 10 along the thickness direction. The first end of the exhaust gas inlet pipe 20 passes through the base 10 and communicates with the first through hole 11. The first end of the exhaust gas inlet pipe 20 has at least one opening group 21. Each opening group 21 includes two openings 210. The two openings 210 are spaced apart. The angle between the center line of the opening 210 and the center line of the first through hole 11 is a preset value. The openings 210 face away from the air inlet end of the first through hole 11.
[0025] Specifically, in the EGR mixer of this application, the exhaust gas in the exhaust gas inlet pipe 20 flows into the first through hole 11 through at least one group of openings 21. Each group of openings 21 includes two openings 210 spaced apart, and the angle between the centerline of the opening 210 and the centerline of the first through hole 11 is a preset value. The openings 210 face away from the intake end of the first through hole 11. In this way, as the air in the first through hole 11 flows from the intake end into the first through hole 11, the exhaust gas in the two openings 210 is downstream of the air flow direction in the first through hole 11. This allows the exhaust gas in the exhaust gas inlet pipe 20 to flow into the first through hole 11 through the two openings 210, thereby improving the mixing effect of the EGR mixer. In addition, since the air can carry the exhaust gas flowing out through the openings 210 during the air flow, a suitable turbocharger can be eliminated during the mixing of the exhaust gas.
[0026] In the above embodiments, the preset value is any value between 45° and 75°. Specifically, the preset value can be 45°, 50°, 55°, 60°, 70°, or 75°. More specifically, the included angle between the center lines of the two openings 210 is any value between 90° and 150°. The included angle between the center lines of the two openings 210 can be any value between 90°, 100°, 110°, 120°, 125°, 130°, 140°, or 150°. In some other embodiments, the angle between the center line of one opening 210 and the center line of the first through hole 11 is different from the angle between the center line of the other opening 210 and the center line of the first through hole 11. The direction of the center line of the first through hole 11 can also be the direction of airflow.
[0027] In one embodiment, each aperture group 21 includes two apertures 210 symmetrically arranged along the centerline of the first through hole 11. In this manner, the centerlines of the two apertures 210 form the same angle with the centerline of the first through hole 11.
[0028] It is worth mentioning that both openings 210 are located at the air intake end of the exhaust gas inlet pipe 20 away from the first through hole 11, and the included angle between the centerlines of the two openings 210 is 90° to 150°. This can be understood as the two openings 210 in the two opening groups 21 being inclined away from the air intake end, ensuring that when air flows along the extension direction of the first through hole 11, the air can drive the flow of exhaust gas through the exhaust gas inlet pipe 20, improving the efficiency of exhaust gas flowing into the first through hole 11.
[0029] In one embodiment, there are multiple opening groups 21, which are spaced apart along the axial direction of the exhaust gas inlet pipe 20. As the number of opening groups 21 increases, the size of the two openings 210 included in each opening group 21 decreases. Increasing the number of opening groups 21 also increases the amount of exhaust gas entering the first through hole 11. The number of opening groups 21 can be two, three, or four, etc.
[0030] In one embodiment, the base 10 further has a second through hole, which communicates with the first through hole 11. The exhaust gas inlet pipe 20 passes through the second through hole and communicates with the first through hole 11. A sealing ring can be provided between the second through hole and the exhaust gas inlet pipe 20 to prevent exhaust gas and air from leaking out through the gap between the exhaust gas inlet pipe 20 and the inner wall of the second through hole 11. Alternatively, a sealant can be provided between the second through hole and the exhaust gas inlet pipe 20 to also prevent exhaust gas and air from leaking out through the gap between the exhaust gas inlet pipe 20 and the inner wall of the second through hole 11.
[0031] The axis of the second through hole is perpendicular to the axis of the first through hole 11, so that the exhaust gas inlet pipe 20 can enter the first through hole 11 through the second through hole. In some other embodiments, the axis of the second through hole is not perpendicular to the axis of the first through hole 11, as long as it can be ensured that the opening 210 provided on the exhaust gas inlet pipe 20 is inclined away from the intake end.
[0032] In some embodiments, the first end of the exhaust gas inlet pipe 20 also has an opening, through which exhaust gas in the exhaust gas inlet pipe 20 can flow into the first through hole 11. There is a gap between the first end of the exhaust gas inlet pipe 20 and the inner wall of the first through hole 11, thereby ensuring the amount of exhaust gas flowing into the first through hole 11 through the opening of the exhaust gas inlet pipe 20.
[0033] In the above embodiments, there is also a gap between the first end of the exhaust gas inlet pipe 20 and the inner wall of the first through hole 11, so as to ensure that there is a gap between the opening 210 included in the opening group 21 and the inner wall, and the gaps between the two openings 210 and the inner wall of the first through hole 11 are the same.
[0034] In one embodiment, each aperture group 21 includes two apertures 210 of the same size. In some other embodiments, the two apertures 210 in each aperture group 21 may have different sizes. It is worth mentioning that when there are multiple aperture groups 21, the sizes of the apertures 210 in each aperture group 21 may be the same or different, and can be adjusted according to actual needs.
[0035] This utility model provides an engine that includes an EGR mixer as described in any of the technical solutions of the first aspect. Since the technical effects produced by this engine are the same as those of the EGR mixer, further details are omitted here.
[0036] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of this utility model. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
Claims
1. An EGR mixer, characterized in that, include: Base and exhaust gas inlet pipe; The base has a first through hole for air to enter, the first through hole extending through the base along its thickness direction, and the first end of the exhaust gas inlet pipe passing through the base and communicating with the first through hole, wherein: The first end of the exhaust gas inlet pipe has at least one set of openings, each set of openings includes two openings, the two openings are spaced apart, the angle between the center line of the opening and the center line of the first through hole is a preset value, and the opening faces the air inlet end away from the first through hole.
2. The EGR mixer as described in claim 1, characterized in that, The preset value is any value between 45° and 75°.
3. The EGR mixer as described in claim 1, characterized in that, There are multiple opening groups, and the multiple opening groups are distributed at intervals along the axial direction of the exhaust gas inlet pipe.
4. The EGR mixer as claimed in claim 1, characterized in that, The base also has a second through hole, which communicates with the first through hole, and the exhaust gas inlet pipe passes through the second through hole and communicates with the first through hole.
5. The EGR mixer as described in claim 4, characterized in that, The axis of the second through hole is perpendicular to the axis of the first through hole.
6. The EGR mixer according to any one of claims 1 to 5, characterized in that, The two openings are symmetrically arranged along the centerline of the first through hole.
7. The EGR mixer as claimed in claim 1, characterized in that, There is a gap between the opening and the inner wall of the first through hole.
8. The EGR mixer as claimed in claim 1, characterized in that, There is a gap between the end of the first end of the exhaust gas inlet pipe and the inner wall of the first through hole.
9. The EGR mixer as claimed in claim 1, characterized in that, Each of the aforementioned opening groups includes two openings of the same size.
10. An engine comprising an EGR mixer, characterized in that, The EGR mixer is the EGR mixer as described in any one of claims 1-9.