Air inlet pipeline and engine

Abstract

The utility model discloses a gas inlet pipeline and an engine. The gas inlet pipeline and the engine comprise a gas inlet header pipe, a first branch gas pipe, a second branch gas pipe and a gas injection pipe, a gas inlet of the first branch gas pipe and a gas inlet of the second branch gas pipe are both communicated with a gas outlet of the gas inlet main pipe, and the injection section of the gas injection pipe is inserted into the gas inlet main pipe and located at the bifurcation position of the gas inlet of the first branch gas pipe and the gas inlet of the second branch gas pipe. The amount of fuel gas needed by the first branch gas pipe is larger than that needed by the second branch gas pipe, the two sides, in the first direction, of the injection section are provided with a first injection part and a second injection part correspondingly, and the first direction is the arrangement direction of gas inlets of the first branch gas pipe and gas inlets of the second branch gas pipe. The first spraying part is close to an air inlet of the first branch air pipe, and the second spraying part is close to an air inlet of the second branch air pipe. The air inlet pipeline can enhance the mixing uniformity of fuel gas and air in a cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an air intake pipeline and an engine. Background Art

[0002] The uniformity of the mixture of gas and air in a gas engine has a great influence on the engine's power, economy, emissions, etc. If the natural gas and air are not mixed evenly, the combustion process will be unstable and the cycle will vary greatly, which is not conducive to the engine's economy and reliability. Especially for the multi-point injection-intake pipe injection method, the injection valve is close to the cylinder and the mixing time is short, resulting in uneven mixing of gas and air in the cylinder. In order to improve the uniformity, a gas injection pipe structure is generally installed in the intake pipe, but its spray holes are basically evenly arranged. The intake pipe is divided into two branches, and the two branches have different structures, different lengths from the injection valve, and different organized airflow movements. Therefore, the use of evenly arranged spray holes will lead to uneven gas intake in the two branches, and the gas entering the cylinder in the circumferential direction cannot fill the entire cylinder well, and then the air and gas are unevenly mixed, resulting in poor economy and reliability. Utility Model Content

[0003] The utility model provides an air intake pipeline and an engine. The air intake pipeline can enhance the mixing uniformity of the fuel gas and air in the cylinder, and improve the economy and reliability.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] An air intake pipeline comprises an air intake main pipe, a first branch air pipe, a second branch air pipe and a fuel gas injection pipe;

[0006] The air inlet of the first branch air pipe and the air inlet of the second branch air pipe are both connected to the air outlet of the air intake main pipe, the injection section of the gas injection pipe is inserted into the air intake main pipe, and the injection section is located at the bifurcation of the air inlet of the first branch air pipe and the air inlet of the second branch air pipe;

[0007] Among them, the amount of gas required by the first branch gas pipe is greater than the amount of gas required by the second branch gas pipe, and the injection section has a first injection part and a second injection part on both sides along the first direction respectively, the first direction is the arrangement direction of the air inlet of the first branch gas pipe and the air inlet of the second branch gas pipe, the first injection part is adjacent to the air inlet of the first branch gas pipe, and the second injection part is adjacent to the air inlet of the second branch gas pipe, and the gas injection amount of the first injection part is greater than the gas injection amount of the second injection part.

[0008] Optionally, the first injection portion includes a plurality of first injection holes, the second injection portion includes a plurality of second injection holes, and a total gas injection amount of the plurality of first injection holes is greater than a total gas injection amount of the plurality of second injection holes.

[0009] Optionally, a cross-sectional area of ​​each of the first spray holes is the same as a cross-sectional area of ​​each of the second spray holes, and the number of the first spray holes is greater than the number of the second spray holes.

[0010] Optionally, a spray cross-sectional area of ​​each of the first spray holes is greater than a cross-sectional area of ​​each of the second spray holes, and the number of the first spray holes is the same as the number of the second spray holes.

[0011] Optionally, a cross-sectional area of ​​each of the first spray holes is greater than a cross-sectional area of ​​each of the second spray holes, and the number of the first spray holes is greater than the number of the second spray holes.

[0012] Optionally, the sum of the total cross-sectional area of ​​the plurality of first spray holes and the total cross-sectional area of ​​the plurality of second spray holes is equal to the cross-sectional area of ​​the air inlet of the gas injection pipe.

[0013] Optionally, the first spray hole is a circular hole, and the second spray hole is a circular hole.

[0014] Optionally, the plurality of first spray holes are arranged in at least one row along the extension direction of the gas spray pipe, and the plurality of second spray holes are arranged in at least one row along the extension direction of the gas spray pipe.

[0015] An embodiment of the utility model further provides an engine, comprising any one of the intake ducts provided in the above technical solutions.

[0016] The embodiment of the utility model provides an intake pipe and an engine, wherein the intake pipe includes an intake main pipe, a first branch air pipe, a second branch air pipe and a gas injection pipe, the injection section of the gas injection pipe can be arranged at the bifurcation of the first branch air pipe and the second branch air pipe, the gas injection pipe has a first injection portion on a side adjacent to the air intake of the first branch air pipe, and has a second injection portion on a side adjacent to the air intake of the second branch air pipe. Since the amount of gas required by the first branch air pipe is greater than the amount of gas required by the second branch air pipe, the gas injection amount of the first injection portion on the gas injection pipe is greater than the gas injection amount of the second injection portion, which can improve the uniformity of gas intake of the two branch air pipes, thereby enhancing the uniformity of mixing of gas and air in the cylinder, and improving economy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of an air intake duct provided in an embodiment of the utility model;

[0018] Figure 2A schematic diagram of the structure of another air intake duct provided in an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of the structure of a gas injection pipe provided in an embodiment of the utility model;

[0020] Figure 4 It is a gas distribution cloud diagram of the air intake pipeline in the prior art;

[0021] Figure 5 A gas distribution cloud diagram of the air intake pipeline provided by an embodiment of the utility model;

[0022] Figure 6 , Figure 7 , Figure 8 This is a curve diagram showing the relationship between the crankshaft angle and the area occupied by the mixed gas under different equivalence ratios.

[0023] icon:

[0024] 1-air intake main pipe; 2-first branch air pipe; 3-second branch air pipe; 4-gas injection pipe; 41-first injection part; 411-first spray hole; 42-second injection part; 421-second spray hole; 43-air inlet of the gas injection pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Please refer to Figure 1 and Figure 2 The utility model provides an air intake pipe, comprising an air intake main pipe 1, a first branch air pipe 2, a second branch air pipe 3 and a gas injection pipe 4;

[0027] The air inlet of the first branch air pipe 2 and the air inlet of the second branch air pipe 3 are both connected to the air outlet of the air intake main pipe 1, and the injection section of the gas injection pipe 4 is inserted into the air intake main pipe 1, and the injection section is located at the bifurcation of the air inlet of the first branch air pipe 2 and the air inlet of the second branch air pipe 3;

[0028] Among them, the amount of gas required by the first branch gas pipe 2 is greater than the amount of gas required by the second branch gas pipe 3, and the injection section has a first injection part 41 and a second injection part 42 on both sides along the first direction respectively. The first direction is the arrangement direction of the air inlet of the first branch gas pipe 2 and the air inlet of the second branch gas pipe 3. The first injection part 41 is adjacent to the air inlet of the first branch gas pipe 2, and the second injection part 42 is adjacent to the air inlet of the second branch gas pipe 3. The gas injection amount of the first injection part 41 is greater than the gas injection amount of the second injection part 42.

[0029] The intake pipe provided by the embodiment of the utility model includes an intake main pipe 1, a first branch air pipe 2, a second branch air pipe 3 and a gas injection pipe 4. The injection section of the gas injection pipe 4 can be arranged at the bifurcation of the first branch air pipe 2 and the second branch air pipe 3. The gas injection pipe 4 has a first injection portion 41 on the side adjacent to the air intake of the first branch air pipe 2, and has a second injection portion 42 on the side adjacent to the air intake of the second branch air pipe 3. Since the amount of gas required by the first branch air pipe 2 is greater than the amount of gas required by the second branch air pipe 3, the gas injection amount of the first injection portion 41 on the gas injection pipe 4 is greater than the gas injection amount of the second injection portion 42, which can improve the uniformity of the gas intake of the two branch air pipes, thereby enhancing the uniformity of the mixing of the gas and air in the cylinder, and improving the economy and reliability.

[0030] Specifically, since the structure of the first branch air pipe 2 is different from that of the second branch air pipe 3, when the gas in the cylinder fills the entire cylinder, the amount of gas required by the first branch air pipe 2 is different from that required by the second branch air pipe 3. The influencing factors may include the length of the branch air pipe, the cross-sectional area of ​​the branch air pipe, and the air resistance in the branch air pipe. The reason why the amount of gas required by the first branch air pipe 2 is greater than the amount of gas required by the second branch air pipe 3 may be at least one of the following situations: (1) the length of the first branch air pipe 2 is greater than the length of the second branch air pipe 3; (2) the cross-sectional area of ​​the air inlet of the first branch air pipe 2 is larger than the cross-sectional area of ​​the air inlet of the second branch air pipe 3; (3) the air resistance in the first branch air pipe 2 is greater than the air resistance in the second branch air pipe 3, etc.

[0031] Specifically, Figure 3As shown, the first injection part 41 may include a plurality of first injection holes 411, and the second injection part 42 may include a plurality of second injection holes 421. The gas injection through the plurality of injection holes can improve the uniformity of air mixing in the intake pipe. The total gas injection amount of the plurality of first injection holes 411 is greater than the total gas injection amount of the plurality of second injection holes 421. Compared with the prior art, the intake amount of the two branch pipes is changed, and the uniformity of the gas intake of the two branch pipes is improved, which can improve the combustion in the cylinder and the combustion stability. In addition, the structure is simple and easy to process. Among them, the gas injection pipe 4 does not have an injection hole arranged in the upstream direction, and the gas outlet resistance facing the air flow direction is large; the gas injection hole is not arranged in the back flow direction either. The injection hole here is close to the wall surface of the bifurcation of the two branch pipes, and the resistance is large, and the gas flow is not smooth.

[0032] In a specific embodiment, the cross-sectional area of ​​each first spray hole 411 can be the same as the cross-sectional area of ​​each second spray hole 421, and the number of the first spray holes 411 is greater than the number of the second spray holes 421, so that the spray holes on both sides of the gas injection pipe 4 are unevenly arranged, so that the gas injection amount of the first injection part 41 is greater than the gas injection amount of the second injection part 42.

[0033] In another specific embodiment, the cross-sectional area of ​​each first spray hole 411 may be greater than the cross-sectional area of ​​each second spray hole 421, and the number of the first spray holes 411 is the same as the number of the second spray holes 421, so that the spray holes on both sides of the gas injection pipe 4 are unevenly arranged, so that the gas injection amount of the first injection part 41 is greater than the gas injection amount of the second injection part 42.

[0034] In another specific embodiment, the cross-sectional area of ​​each first spray hole 411 may be greater than the cross-sectional area of ​​each second spray hole 421, and the number of the first spray holes 411 is greater than the number of the second spray holes 421, so that the spray holes on both sides of the gas injection pipe 4 are unevenly arranged, resulting in that the gas injection amount of the first injection part 41 is greater than the gas injection amount of the second injection part 42.

[0035] In the embodiment of the utility model, the first spray hole 411 may be a circular hole, and the second spray hole 421 may be a circular hole. Optionally, the shapes of the first spray hole 411 and the second spray hole 421 may be other shapes, and the shapes of the first spray hole 411 and the second spray hole 421 may be the same or different, and are not limited here. The shapes and sizes of the plurality of first spray holes 411 may be the same or different, and the shapes and sizes of the plurality of second spray holes 421 may be the same or different, as long as the gas injection amount of the first spray part 41 is greater than the gas injection amount of the second spray part 42.

[0036] Specifically, the plurality of first spray holes 411 may be arranged in at least one row along the extension direction of the gas spray pipe 4, and the plurality of second spray holes 421 may be arranged in at least one row along the extension direction of the gas spray pipe 4, which has a simple structure and is easy to manufacture. Optionally, the first spray holes 411 and the second spray holes 421 may be arranged on both sides of the gas spray pipe 4 according to the hole size and the number of holes, which are not limited here.

[0037] In the embodiment of the utility model, the sum of the total cross-sectional areas of the above-mentioned multiple first spray holes 411 and the total cross-sectional areas of the multiple second spray holes 421 is the same as the cross-sectional area of ​​the air inlet 43 of the gas injection pipe 4, which can make the speed of gas entering the gas injection pipe 4 and the speed of gas spraying out of the gas injection pipe 4 the same, avoiding the inconsistency between the gas entry speed and the spraying speed, and better providing gas to the first branch gas pipe 2 and the second branch gas pipe 3.

[0038] In practical applications, the uniform arrangement of the spray holes on the gas injection pipe in the prior art can be compared with the uneven arrangement of the spray holes in this embodiment. Figure 4 The figure shows the distribution of gas in the air intake pipeline in the prior art. Figure 5 This is a cloud diagram of the gas distribution in the intake pipe in this embodiment. Figure 4 and Figure 5 The values ​​in the figure are measured at a crank angle of -280°. In the branch pipe, the larger the area occupied by the mixed gas with an equivalence ratio of 0.4 to 0.6, the more uniform the mixture of gas and air is. Figure 4 and Figure 5 Colors A, B, and C in the figure show the isosurfaces with equivalent ratios of 0.4, 0.5, and 0.6, respectively. Figure 4 It can be seen that in the prior art, the uneven distribution of the three colors A, B, and C at the two branch gas pipes indicates uneven gas intake, wherein the first branch gas pipe 01 has relatively less intake gas, while the second branch gas pipe 02 has more gas; whereas in this embodiment, the aperture of the first spray hole 411 of the gas injection pipe 4 adjacent to the first branch gas pipe 2 is increased, and the aperture of the second spray hole 421 adjacent to the second branch gas pipe 3 is reduced, that is, the spray holes on both sides of the gas injection pipe 4 are unevenly arranged, as shown in FIG. Figure 5 As shown, the three colors A, B, and C at the two branch gas pipes tend to mix. It can be seen that the amount of gas in the first branch gas pipe 2 has increased significantly, the amount of gas in the second branch gas pipe 3 has decreased, and the gas intake of the two branch gas pipes is more uniform.

[0039] like Figures 6 to 8The curves shown are the relationship between the crankshaft angle of the engine and the area occupied by the mixed gas. E represents the curve when the nozzles on both sides of the gas injection pipe are evenly arranged, and F represents the curve when the nozzles on both sides of the gas injection pipe are evenly arranged. Among them, in the branch gas pipe, the ideal equivalent ratio Ф=0.52(λ=1.9): V(Ф<0.4) represents the area occupied by the mixed gas with an equivalent ratio of 0~0.4, and V(Ф>0.6) represents the area occupied by the mixed gas with an equivalent ratio greater than 0.6. The smaller the volume of the two areas, the fewer areas in the cylinder are too rich or too lean; V(0.4<Ф<0.6) represents the area occupied by the mixed gas with an equivalent ratio of 0.4~0.6. The larger the volume of this area, the more evenly the gas and air are mixed. Figures 6 to 8 It can be seen that, compared with the uniform arrangement of the spray holes, the V (0.4<Ф<0.6) area occupied by the gas injection pipe structure with non-uniform arrangement of the spray holes is relatively high, the mixing is relatively uniform, and the V (Ф>0.6) area with too high concentration is small. That is, from the circumferential direction, in the embodiment of the utility model, the gas entering the intake pipe can fill the entire cylinder well, enhancing the mixing uniformity of the gas and air in the cylinder.

[0040] An embodiment of the utility model further provides an engine, comprising any one of the intake ducts provided in the above technical solutions.

[0041] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An air intake duct, characterized in that: It includes an air intake main pipe, a first branch air pipe, a second branch air pipe and a gas injection pipe; The air inlet of the first branch air pipe and the air inlet of the second branch air pipe are both connected to the air outlet of the air intake main pipe, the injection section of the gas injection pipe is inserted into the air intake main pipe, and the injection section is located at the bifurcation of the air inlet of the first branch air pipe and the air inlet of the second branch air pipe; Among them, the amount of gas required by the first branch gas pipe is greater than the amount of gas required by the second branch gas pipe, and the injection section has a first injection part and a second injection part on both sides along the first direction respectively, the first direction is the arrangement direction of the air inlet of the first branch gas pipe and the air inlet of the second branch gas pipe, the first injection part is adjacent to the air inlet of the first branch gas pipe, and the second injection part is adjacent to the air inlet of the second branch gas pipe, and the gas injection amount of the first injection part is greater than the gas injection amount of the second injection part.

2. The air intake duct according to claim 1, characterized in that: The first injection portion includes a plurality of first injection holes, the second injection portion includes a plurality of second injection holes, and a total gas injection amount of the plurality of first injection holes is greater than a total gas injection amount of the plurality of second injection holes.

3. The air intake duct according to claim 2, characterized in that: The cross-sectional area of ​​each of the first spray holes is the same as the cross-sectional area of ​​each of the second spray holes, and the number of the first spray holes is greater than the number of the second spray holes.

4. The air intake duct according to claim 2, characterized in that: A spray cross-sectional area of ​​each of the first spray holes is greater than a cross-sectional area of ​​each of the second spray holes, and the number of the first spray holes is the same as the number of the second spray holes.

5. The air intake duct according to claim 2, characterized in that: The cross-sectional area of ​​each of the first spray holes is greater than the cross-sectional area of ​​each of the second spray holes, and the number of the first spray holes is greater than the number of the second spray holes.

6. The air intake duct according to any one of claims 2 to 5, characterized in that: The sum of the total cross-sectional area of ​​the plurality of first spray holes and the total cross-sectional area of ​​the plurality of second spray holes is equal to the cross-sectional area of ​​the gas inlet of the gas spray pipe.

7. The air intake duct according to any one of claims 2 to 5, characterized in that: The first spray hole is a circular hole, and the second spray hole is a circular hole.

8. The air intake duct according to any one of claims 2 to 5, characterized in that: The plurality of first spray holes are arranged in at least one row along the extending direction of the gas spray pipe, and the plurality of second spray holes are arranged in at least one row along the extending direction of the gas spray pipe.

9. An engine, characterized in that: Comprising an air intake duct as described in any one of claims 1-8.

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