Mixing device, internal combustion engine system, and vehicle

Abstract

This application relates to mixing devices, internal combustion engine systems, and vehicles. The mixing device includes a housing having: a fresh air inlet; a mixture outlet; a flow passage extending from the fresh air inlet to the mixture outlet, the flow passage having a fresh air section and a mixing section; and an injector port that opens from the outside of the housing into the flow passage between the fresh air section and the mixing section. In the fresh air section, a reduced-bore passage section extends radially inward and downstream from the inner wall of the housing and completely covers the injector port axially. Upstream of the injector port, an annular protrusion projects from the inner wall of the housing toward the reduced-bore passage section, forming a first gap between the annular protrusion and the reduced-bore passage section. This at least reduces the risk of backfire and particulate backflow damaging the injector.

Description

Technical Field

[0001] This application relates to the technical field of vehicle internal combustion engines, specifically to a hybrid device, an internal combustion engine system, and a vehicle. Background Technology

[0002] In a vehicle's internal combustion engine, the efficiency of fuel-air mixing directly affects combustion efficiency and power output. Traditional fuel mixing devices typically use injectors to atomize fuel and mix it with fresh air to form a combustible mixture, which is then fed into the cylinder.

[0003] However, during internal combustion engine combustion, the high-temperature, high-pressure environment inside the cylinder can easily trigger abnormal combustion (such as knocking or backfire), causing the flame to flow back through the intake passage to the mixing unit. Backfire generates high temperatures and pressures up to 30 bar, which are far higher than the intake air pressure and fuel pressure. Since the injectors are usually exposed inside the mixing chamber, the backfire flame directly impacting the injector head can lead to the following consequences:

[0004] High-temperature flames can cause thermal deformation of metal components or ablation of the coating on the injector.

[0005] Unburned particles adhere to the nozzle of the injector, reducing atomization efficiency;

[0006] Extreme temperature fluctuations accelerate the aging of seals, increasing the risk of fuel leaks.

[0007] In addition, the carbon soot particles and metal debris produced by combustion are carried into the mixing device by the airflow, and their high-speed impact on the surface of the injector leads to:

[0008] Long-term erosion by particulate matter can cause scratches on the surface of the injector or structural fatigue.

[0009] Wear and tear can enlarge the nozzle, disrupting fuel atomization uniformity and increasing pollutant emissions. Utility Model Content

[0010] The purpose of this application is to solve or at least alleviate some of the problems existing in the prior art.

[0011] A first aspect of this application is to provide a mixing device for mixing fuel and air, the mixing device comprising a housing having:

[0012] Fresh air inlet located at the upstream end;

[0013] The mixture outlet is located at the downstream end;

[0014] A flow channel extending from the fresh air inlet to the mixture outlet, the flow channel having an upstream fresh air section and a downstream mixing section; and

[0015] An injector port is provided in the flow channel from the outside of the housing between the fresh air section and the mixing section.

[0016] Its features are,

[0017] In the fresh air section, a narrowing channel section with a diameter that gradually decreases from upstream to downstream extends inward and downstream from the inner wall of the housing along the radial direction of the housing. The narrowing channel section completely covers the injector port along the axial direction of the housing. Upstream of the injector port, an annular protrusion protrudes from the inner wall of the housing toward the narrowing channel section, thereby forming a first gap between the annular protrusion and the narrowing channel section.

[0018] Therefore, the backfire flame will not directly impact the injector head, but will instead enter the first gap between the annular protrusion and the narrowed channel section, and be extinguished by colliding with the wall surrounding the first gap. Combustion particles (including soot particles and / or metal fragments) will also follow into the first gap, thus preventing them from impacting the injector surface at high speed. This at least reduces the damage to the injector caused by backfire flames and particle backflow.

[0019] Optionally, upstream of the annular protrusion, an annular cavity is defined by the narrowed channel section and the annular protrusion, and the first slit opens into the annular cavity. Thus, the backfire flame and particles reaching the first slit further enter the annular cavity and collide with the wall of the annular cavity, thereby extinguishing the backfire flame and allowing the particles to be stored in the annular cavity, thus protecting the injector.

[0020] Optionally, on the radially outer side of the first slit, the annular protrusion has at least one through-hole leading into the annular cavity, the through-hole extending radially inward from upstream to downstream. Thus, airflow entering the annular cavity through the first slit can exit the annular cavity through the through-hole. Due to the specific orientation of the through-hole (extending radially inward from upstream to downstream), the airflow exiting the annular cavity can move away from the injector.

[0021] Optionally, the annular protrusion has a plurality of through holes, which are evenly distributed along the circumferential direction of the annular protrusion. Alternatively, the through holes are arranged more densely at locations farther from the injector interface than at locations closer to the injector interface. This allows the airflow exiting from the through holes to be further away from the injector interface, thereby better protecting the injector.

[0022] Optionally, the reduced-diameter channel section has a tapered section with a continuously decreasing diameter from upstream to downstream and a cylindrical section with a constant diameter located downstream of the tapered section, wherein the first gap is formed between the tapered section and the annular protrusion.

[0023] Optionally, the cylindrical section extends into the mixing section of the flow channel, and the outer wall of the cylindrical section forms a second gap with the inner wall of the mixing section of the flow channel, the extension direction of the second gap being aligned with the first gap. This facilitates the arrival of tempered flames and particles entering the second gap into the first gap.

[0024] Optionally, the mixing section is formed by a venturi tube, which includes, from upstream to downstream, an inlet section, a contraction section, a throat section, and an expansion section. Optionally, the inlet section has an EGR exhaust gas inlet, and the cylindrical section terminates upstream of the EGR exhaust gas inlet. In one embodiment, the venturi tube is integrally formed with the housing, that is, the venturi tube is integrally formed through the inner wall of the housing. In an alternative embodiment, the venturi tube is formed by a separate component and installed in the housing, that is, the inner wall of the housing itself does not form the mixing section.

[0025] Optionally, the housing has an EGR (Electrostatic Gamma) in a mixing section that leads into the flow channel. E xhaust G as R EGR (exhaust gas recirculation) exhaust gas inlet, the EGR valve mounting flange is installed at the EGR exhaust gas inlet, and the EGR valve can be installed on the EGR valve mounting flange.

[0026] A second aspect of this application is to provide an internal combustion engine system comprising an internal combustion engine and the aforementioned mixing device for mixing fuel and air and delivering the mixture to the cylinders of the internal combustion engine.

[0027] A third aspect of this application is to provide a vehicle that includes the aforementioned internal combustion engine system. Attached Figure Description

[0028] The embodiments of this application will be described in further detail below with reference to the accompanying drawings. However, those skilled in the art will understand that these drawings are for illustrative purposes only and should not be construed as limiting the scope of this application. The accompanying drawings show:

[0029] Figure 1 This is a perspective view of a mixing device according to one embodiment of this application;

[0030] Figure 2This is a view of a mixing device according to one embodiment of this application, viewed from the fresh air inlet side;

[0031] Figure 3 This is a cross-sectional view of a mixing device according to one embodiment of this application;

[0032] Figure 4 This is another cross-sectional view of a mixing device according to one embodiment of this application;

[0033] Figure 5 This is a partial cross-sectional perspective view of a mixing device according to one embodiment of this application;

[0034] Figure 6 The mixing device according to one embodiment of this application is along Figure 2 A cross-sectional view showing the section line AA;

[0035] Figure 7 This is a perspective view of the venturi tube of a mixing device according to one embodiment of this application;

[0036] Figure 8 This is a cross-sectional view of the venturi tube of a mixing device according to one embodiment of this application;

[0037] Figure 9 This is a perspective view of the EGR valve mounting flange of a mixing device according to one embodiment of this application;

[0038] Figure 10 This is another perspective view of the EGR valve mounting flange of a mixing device according to one embodiment of this application;

[0039] Figure 11 This is a cross-sectional view of the EGR valve mounting flange of a mixing device according to one embodiment of this application;

[0040] Figure 12 This is a perspective view of the housing of a mixing device according to one embodiment of this application;

[0041] Figure 13 This is a cross-sectional view of the housing of a mixing device according to one embodiment of this application;

[0042] Figure 14 This is another cross-sectional view of the housing of a mixing device according to one embodiment of this application;

[0043] Figure 15 This is another cross-sectional view of the housing of a mixing device according to one embodiment of this application; and

[0044] Figure 16 This is another cross-sectional view of the housing of a mixing device according to one embodiment of this application. Detailed Implementation

[0045] Figure 1 A mixing device 10 according to one embodiment of this application is shown and Figure 2 This diagram shows a view of a mixing device 10 according to one embodiment of this application, viewed from the fresh air inlet 22 side. The mixing device 10 is used in an internal combustion engine system of a vehicle to mix fuel and air and then deliver the mixture to the cylinders of the internal combustion engine. Here, the fuel can be any suitable fuel such as gasoline, diesel, or natural gas. Figure 1 and 2 As can be seen from the image, the mixing device 10 includes a housing 20, which has a fresh air inlet 22 located at its upstream end. Figure 2 ), the mixture outlet 25 located at the downstream end Figure 1 And a flow channel 30 extending from the fresh air inlet 22 to the mixture outlet 25. It should be noted that the terms "upstream" and "downstream" as used in this application refer to the flow direction of fresh air and its mixture with fuel within the flow channel 30. That is, a position closer to the fresh air inlet 22 is upstream of a position closer to the mixture outlet 25, and correspondingly, a position closer to the mixture outlet 25 is downstream of a position closer to the fresh air inlet 22.

[0046] In addition, from Figure 1 and Figure 2 As can be seen, the housing 20 has a first flange 21 located at the fresh air inlet 22 and a second flange 24 located at the mixture outlet 25. The first flange 21 is used to fix the mixing device 10 to an upstream device, such as an air compressor, while the second flange 24 is used to fix the mixing device 10 to a downstream device, such as an internal combustion engine intake manifold.

[0047] In addition, from Figure 1 and Figure 2 As can be seen, the housing 20 has an injector port 23 at approximately the center of its exterior, which leads into the flow channel 30 of the housing 20. An injector can be installed in the injector port 23 to inject fuel into the flow channel 30 of the housing 20, thereby mixing it with fresh air introduced into the flow channel 30 from the fresh air inlet 22 of the housing 20 to form a fuel-air mixture.

[0048] An EGR valve mounting flange 60 is also provided at the top of the housing 20, on which an EGR valve can be installed. Thus, the EGR exhaust gas from the internal combustion engine can be introduced into the flow passage 30 of the housing 20 via the EGR valve. Figure 1 As can be clearly seen, the EGR valve mounting flange 60 has two EGR exhaust gas inlets 61 for introducing EGR exhaust gas from the EGR valve into the flow channel 30 of the housing 20. However, this is merely exemplary; the EGR valve mounting flange 60 may also have only one EGR exhaust gas inlet 61 or more EGR exhaust gas inlets 61. When the EGR valve mounting flange 60 has multiple EGR exhaust gas inlets 61, the EGR exhaust gas inlets 61 can be arranged sequentially along the flow direction of fresh air and its mixture with fuel in the flow channel 30. It should be noted that the EGR valve mounting flange 60 is not mandatory; that is, the mixing device 10 of this application can also be used in internal combustion engine systems without exhaust gas recirculation functionality.

[0049] Figure 3 A cross-sectional view of a mixing device 10 according to one embodiment of this application is shown, wherein the cross-section passes through the central longitudinal axis of the flow channel 30 of the housing 20 of the mixing device 10 and through the injector port 23. From Figure 3 As can be clearly seen, the flow channel 30 extends from the fresh air inlet 22 of the housing 20 to the mixture outlet 25. Furthermore, it can be seen that the flow channel 30 has an upstream fresh air section 31 and a downstream mixing section 32. Fresh air enters the fresh air section 31 of the flow channel 30 from the fresh air inlet 22, and after mixing with fuel in the mixing section 32, it exits from the mixture outlet 25. Figure 3 As can be clearly seen, between the fresh air section 31 and the mixing section 32, the injector port 23 extends from the outside of the housing 20 into the flow channel 30.

[0050] Furthermore, in the fresh air section 31, a narrowing channel section 27, whose diameter gradually decreases from upstream to downstream, extends inward and downstream from the inner wall of the housing 20 along the radial direction of the housing 20. It should be noted that the gradual decrease in diameter from upstream to downstream does not mean that the diameter must decrease continuously from upstream to downstream; rather, it can remain constant in certain sections. The narrowing channel section 27 extends along the axial direction of the housing 20 to at least completely cover the injector inlet 23, such that fuel injected by the injector is guided through the outer wall of the narrowing channel section 27 into the mixing section 32.

[0051] In addition, from Figure 3 As can be seen, upstream of the injector inlet 23, an annular protrusion 28 protrudes from the inner wall of the housing 20 toward the reduced-diameter channel section 27, thereby forming a first gap 33 between the annular protrusion 28 and the reduced-diameter channel section 27. Therefore, the backfire flame will not directly impact the injector head, but will instead enter the first gap 33 between the annular protrusion 28 and the reduced-diameter channel section 27, and be extinguished by colliding with the wall surrounding the first gap 33. Combustion particles (including soot particles and / or metal fragments) will also follow into the first gap 33, thus preventing them from impacting the injector surface at high speed. This at least reduces the damage to the injector caused by backfire flames and particle backflow.

[0052] from Figure 3 It can also be seen that upstream of the annular protrusion 28, an annular cavity 35 is defined by the narrowed channel section 27 and the annular protrusion 28, and the first slit 33 opens into the annular cavity 35. Thus, the backfire flame and particles reaching the first slit 33 further enter the annular cavity 35 and collide with the wall of the annular cavity 35, thereby extinguishing the backfire flame and allowing the particles to be stored in the annular cavity 35, thus protecting the injector.

[0053] exist Figure 3 In the illustrated embodiment, the tapered channel section 27 has a tapered section whose diameter continuously decreases from upstream to downstream, and a cylindrical section with a constant diameter located downstream of the tapered section. The first gap 33 is formed between the tapered section and the annular protrusion 28. Thus, airflow entering the first gap 33 is slowed down after passing through the first gap 33, thereby reducing the impact of the airflow on the wall of the annular cavity 35.

[0054] exist Figure 3 In the illustrated embodiment, the cylindrical section extends into the mixing section 32 of the flow channel 30, and the outer wall of the cylindrical section forms a second gap 42 with the inner wall of the mixing section 32 of the flow channel 30, the extension direction of the second gap 42 being aligned with the first gap 33. This facilitates the arrival of tempered flames and particles entering the second gap 42 into the first gap 33.

[0055] exist Figure 3 In the illustrated embodiment, the mixing section 32 is formed by a venturi tube 40, which, from upstream to downstream, sequentially includes an inlet section, a contraction section, a throat section, and a dilation section. Here, the venturi tube 40 is constructed as a separate component and is housed within the housing 20. This creates an annular space between the inner wall of the housing 20 and the outer wall of the venturi tube 40. Figure 3It can also be seen that the inlet section has a substantially constant inner diameter, and the venturi tube 40 has an EGR exhaust gas inlet 41 in the inlet section. The cylindrical section terminates upstream of the EGR exhaust gas inlet 41, thereby allowing the EGR exhaust gas, which is input into the annular space between the inner wall of the housing 20 and the outer wall of the venturi tube 40, to enter the mixing section 32 formed by the venturi tube 40 through the EGR exhaust gas inlet 41 and mix with the fresh air and fuel arriving there. By constructing the mixing section 32 with the venturi tube 40, the intake capacity of the EGR exhaust gas can be improved, while the interception effect on the backfire flame can be increased. The structure of the venturi tube 40 will be further described below in conjunction with the accompanying drawings. However, as an alternative, the venturi tube 40 can also be integrally formed with the housing 20.

[0056] Figure 4 Another cross-sectional view of a mixing device 10 according to one embodiment of this application is shown, wherein the cutting plane also passes through the central longitudinal axis of the flow passage 30 of the housing 20 of the mixing device 10, but not through the injector port 23, but through the EGR valve mounting flange 60. That is... Figure 4 The cutting plane is basically perpendicular to Figure 3 The cross-section. And... Figure 3 Unlike other places, the injector interface 23 is not visible here, but the EGR valve mounting flange 60 is clearly visible. From Figure 4 As can be seen, the housing 20 has an EGR exhaust gas inlet 26 in the mixing section 32 of the flow channel 30, the EGR valve mounting flange 60 is installed at the EGR exhaust gas inlet 26, and an EGR valve can be installed on the EGR valve mounting flange 60. Figure 4 As can be clearly seen, the EGR valve mounting flange 60 has two EGR exhaust gas inlets 61. EGR exhaust gas from the EGR valve can enter the annular space formed between the inner wall of the housing 20 and the outer wall of the venturi tube 40 through the EGR exhaust gas inlets 61, and enter the mixing section 32 of the flow channel 30 from the annular space through the EGR exhaust gas inlet 41 of the venturi tube 40.

[0057] Figure 5 A partial cross-sectional perspective view of a mixing device 10 according to one embodiment of this application is shown, while using... Figure 3 The cutting surface and Figure 4The cross-section of the mixing device 10 is partially cut. Here, the positional relationship of the injector inlet 23 and the EGR valve mounting flange 60 relative to the other components can be seen simultaneously. It is particularly noteworthy that, radially outside the first slot 33, the annular protrusion 28 also has a through-hole 34, thereby allowing the airflow entering the annular cavity 35 through the first slot 33 to flow out again from the annular cavity 35 through the through-hole 34. The structure of the through-hole 34 will be further described below in conjunction with the accompanying drawings.

[0058] Figure 6 The mixing device 10 according to one embodiment of this application is shown along the edge. Figure 2 The cross-sectional view shown is along section line AA. The structural details of the annular protrusion 28 can be seen more clearly here. From... Figure 6 As can be seen, the annular protrusion 28 forms a first gap 33 with the narrowed-diameter channel section 27, particularly with the tapered section of the narrowed-diameter channel section 27, and defines an annular cavity 35 upstream of the annular protrusion 28 and the narrowed-diameter channel section 27, particularly with the tapered section of the narrowed-diameter channel section 27. Radially outside the first gap 33, the annular protrusion 28 has a through-hole 34 leading into the annular cavity 35, the through-hole 34 extending radially inward from upstream to downstream. Thus, the airflow entering the annular cavity 35 through the first gap 33 can exit from the annular cavity 35 through the through-hole 34. Due to the specific orientation of the through-hole 34 (extending radially inward from upstream to downstream), the airflow exiting the annular cavity 35 can move away from the injector, thereby protecting the injector. Figure 6 The direction of the tempering gas flow is schematically shown by arrows.

[0059] Figure 7 A perspective view of the venturi tube 40 of a mixing device 10 according to one embodiment of this application is shown. Figure 8 A cross-sectional view of the venturi tube 40 of a mixing device 10 according to one embodiment of this application is shown. Figure 7 and Figure 8 As can be seen, the Venturi tube 40 has multiple EGR exhaust gas inlet ports 41 near its inlet end. Here, the number of EGR exhaust gas inlet ports 41 is merely exemplary, and this application is not limited to this. Figure 7 and Figure 8 The number of EGR exhaust gas inlet ports 41 shown is not limited to the number provided; fewer or more EGR exhaust gas inlet ports 41 can be provided. Those skilled in the art will understand that for a mixing device 10 without exhaust gas recirculation, the venturi 40 has no EGR exhaust gas inlet ports 41.

[0060] Figure 9 and Figure 10 Perspective views of the EGR valve mounting flange 60 of a mixing device 10 according to one embodiment of this application are shown respectively. Figure 11 A cross-sectional view of the EGR valve mounting flange 60 of a mixing device 10 according to one embodiment of this application is shown. Figures 9 to 11 As can be seen, the EGR valve mounting flange 60 has two parts: a larger part for fixing to the housing 20 of the mixing device 10, and a smaller part for fixing the EGR valve. Multiple fixing holes are provided on both parts, through which fasteners can pass to fix the EGR valve mounting flange 60 to the housing 20 and to the EGR valve.

[0061] Figure 12 A perspective view of the housing 20 of a mixing device 10 according to one embodiment of this application is shown. Figure 13 and Figure 14 Cross-sectional views of the housing 20 of a mixing device 10 according to one embodiment of this application are shown. Figures 12 to 14 and Figure 1 , Figure 3 and Figure 4 Basically corresponds, only the part that was removed Figure 1 , Figure 3 and Figure 4 The Venturi tube 40 and EGR valve mounting flange 60 are included, so they will not be described in detail here.

[0062] Figure 15 and Figure 16 Cross-sectional views of the housing 20 of a mixing device 10 according to one embodiment of this application are shown, with the cut plane perpendicular to the central longitudinal axis of the flow channel 30 and passing through the injector port 23. From Figure 15 and Figure 16It is clearly visible that the injector port 23 opens into the space between the reduced-diameter channel section 27 and the inner wall of the housing 20. An annular protrusion 28 extends from the inner wall of the housing 20 toward the reduced-diameter channel section 27, thereby forming an annular first gap 33 between the annular protrusion 28 and the reduced-diameter channel section 27. Radially outside the first gap 33, the annular protrusion 28 has a plurality of through holes 34 evenly distributed circumferentially, all of which open into the annular cavity 35 defined by the reduced-diameter channel section 27 and the annular protrusion 28. However, this uniform circumferential distribution of the through holes 34 is merely exemplary. The through holes 34 can also be arranged non-uniformly. For example, the through holes 34 can be arranged more densely away from the injector port 23, and more sparsely or even absent near the injector port 23, thereby causing the airflow exiting from the through holes 34 to be further away from the injector port 23, thus better protecting the injector.

[0063] The mixing device 10 can be used in an internal combustion engine system of a vehicle, the internal combustion engine system including an internal combustion engine, and the mixing device 10 is used to mix fuel and air and deliver the mixture to the cylinders of the internal combustion engine.

[0064] With this configuration of the mixing device 10, the backfire flame and particles will not directly impact the injector head. This at least reduces the damage to the injector caused by the backflow of backfire flame and particles and extends the service life of the injector.

[0065] The above descriptions are merely exemplary embodiments of this application. The scope of protection of this application is not limited to the above embodiments, and all technical solutions falling within the concept of this application are within the scope of protection of this application. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this application should also be considered within the scope of protection of this application.

Claims

1. A mixing device (10) for mixing fuel and air, the mixing device (10) comprising a housing (20) having: Fresh air inlet located at the upstream end (22); The mixture outlet (25) is located at the downstream end; A flow channel (30) extending from the fresh air inlet (22) to the mixture outlet (25), the flow channel (30) having an upstream fresh air section (31) and a downstream mixing section (32); and An injector port (23) is provided between the fresh air section (31) and the mixing section (32) in the flow channel (30) from the outside of the housing (20). Its features are, In the fresh air section (31), a narrowing channel section (27) with a diameter gradually decreasing from upstream to downstream extends inward and downstream from the inner wall of the housing (20) along the radial direction of the housing (20). The narrowing channel section (27) completely covers the injector port (23) along the axial direction of the housing (20). Upstream of the injector port (23), an annular protrusion (28) protrudes from the inner wall of the housing (20) toward the narrowing channel section (27), thereby forming a first gap (33) between the annular protrusion (28) and the narrowing channel section (27).

2. The mixing device (10) according to claim 1, characterized in that, Upstream of the annular protrusion (28), an annular cavity (35) is defined by the narrowed channel section (27) and the annular protrusion (28), and the first gap (33) opens into the annular cavity (35).

3. The mixing device (10) according to claim 2, characterized in that, On the radial exterior of the first slit (33), the annular protrusion (28) has at least one through hole (34) leading into the annular cavity (35), the through hole (34) extending radially inward from upstream to downstream.

4. The mixing device (10) according to claim 3, characterized in that, The annular protrusion (28) has multiple through holes (34), wherein: The through holes (34) are evenly distributed along the circumferential direction of the annular protrusions (28); or The through holes (34) are arranged more densely away from the injector interface (23) than they are arranged near the injector interface (23).

5. The mixing device (10) according to claim 1, characterized in that, The tapered channel section (27) has a tapered section whose diameter decreases continuously from upstream to downstream and a cylindrical section with a constant diameter located downstream of the tapered section, and the first gap (33) is formed between the tapered section and the annular protrusion (28).

6. The mixing device (10) according to claim 5, characterized in that, The cylindrical section extends into the mixing section (32) of the flow channel (30) and the outer wall of the cylindrical section forms a second gap (42) with the inner wall of the mixing section (32) of the flow channel (30), the extension direction of the second gap (42) being aligned with the first gap (33).

7. The mixing device (10) according to claim 6, characterized in that, The mixing section (32) is formed by a venturi tube (40), which includes an inlet section, a contraction section, a throat section, and an expansion section from upstream to downstream. The inlet section has an EGR exhaust gas inlet (41), and the cylindrical section terminates upstream of the EGR exhaust gas inlet (41). The venturi tube (40) is integrally formed with the housing (20); or The Venturi tube (40) is composed of separate components and is installed in the housing (20).

8. The mixing device (10) according to claim 1, characterized in that, The housing (20) has an EGR exhaust gas inlet (26) in the mixing section (32) of the flow channel (30), an EGR valve mounting flange (60) is installed at the EGR exhaust gas inlet (26), and an EGR valve can be installed on the EGR valve mounting flange (60).

9. An internal combustion engine system, comprising an internal combustion engine, Its features are, The internal combustion engine system further includes a mixing device (10) according to any one of claims 1 to 8, for mixing fuel and air and then delivering the mixture to the cylinders of the internal combustion engine.

10. A type of vehicle, Its features are, The vehicle includes the internal combustion engine system according to claim 9.

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