Intake manifold, engine and vehicle

Abstract

The application discloses an air intake manifold, an engine and a vehicle. The air intake manifold comprises a cavity, the cavity has an air intake end, a flow guide part is formed on the cavity, and the flow guide part is located on one side of the cavity along a first direction; a plurality of fluid branch pipes are connected to the other side of the cavity along the first direction, and the plurality of fluid branch pipes are communicated with the cavity; the flow guide part is opposite to at least one of the plurality of fluid branch pipes adjacent to the air intake end, and the cavity forms a vortex area at the flow guide part and the at least one of the plurality of fluid branch pipes adjacent to the air intake end; and the vortex area is suitable for forming a vortex of fluid entering from the air intake end in the vortex area. According to the air intake manifold, the oil-gas distribution of each fluid branch pipe is uniform, when the air intake manifold is used for the engine, the combustion of each cylinder of the engine is consistent, and the thermal efficiency of the engine is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to an intake manifold, an engine, and a vehicle. Background Technology

[0002] Atkinson cycle engines improve engine thermal efficiency by delaying intake valve closing, meaning the intake valve remains open for a period during the initial compression stroke, thus expelling some of the air-fuel mixture drawn into the cylinder. This achieves an expansion ratio greater than the compression ratio. In contrast, during engine operation, the airflow in the intake manifold can cause some of the air-fuel mixture in one cylinder to be drawn into another, resulting in uneven distribution of the air-fuel mixture and inconsistent combustion across the cylinders. This reduces the engine's thermal efficiency. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an intake manifold that makes the oil and gas distribution in each fluid branch pipe uniform, so that when the intake manifold is used in an engine, the combustion in each cylinder of the engine is consistent, thereby improving the thermal efficiency of the engine.

[0004] Another object of the present invention is to provide an engine employing the above-described intake manifold.

[0005] Another object of the present invention is to provide a vehicle employing the above-described engine.

[0006] An intake manifold according to a first aspect of the present invention includes: a cavity having an intake end, a guide portion formed on the cavity, the guide portion being located on one side of the cavity along a first direction; a plurality of fluid branches, each of the plurality of fluid branches being connected to the other side of the cavity along the first direction, and each of the plurality of fluid branches communicating with the cavity; the guide portion being opposite to at least one of the plurality of fluid branches adjacent to the intake end, the cavity forming a vortex region at the guide portion and at least one of the plurality of fluid branches adjacent to the intake end, the vortex region being adapted to cause fluid entering from the intake end to form a vortex in the vortex region.

[0007] According to the intake manifold of the present invention, the fluid flowing in from the intake end can form a vortex at the guide section, which can prevent the oil-air mixture in the fluid branch pipe adjacent to the intake end from flowing into other fluid branch pipes when air is introduced from the fluid branch pipe away from the intake end. This ensures the uniformity of the distribution of the fluid flowing in from the intake end and the oil-air mixture in each fluid branch pipe, thereby ensuring the consistency of combustion in multiple cylinders of the engine and improving the stability of engine operation. In addition, the intake manifold has a simple structure, reducing the production cost of the intake manifold and increasing the production rate of the intake manifold.

[0008] According to some embodiments of the present invention, the intake manifold further includes: a fluid main pipe, one end of which is connected to the intake end, the intake end being connected to the cavity through the fluid main pipe, and the angle between the tangent of the fluid main pipe on the side adjacent to the guide portion and the tangent on the side of the guide portion away from the central axis in the length direction is α, wherein α satisfies: 5°≤α≤80°.

[0009] According to some embodiments of the present invention, a plurality of fluid branches are arranged along the length of the cavity, and the angle between the tangent on the side of the fluid branch closest to the fluid main pipe and the central axis of the fluid branch closest to the fluid main pipe is β, wherein β satisfies: 5°≤β≤80°.

[0010] According to some embodiments of the present invention, the flow guide is directly opposite at least one of the plurality of fluid branches adjacent to the fluid main; or, the flow guide is disposed on the side of the cavity away from the fluid main along a second direction, the second direction being perpendicular to the first direction.

[0011] According to some embodiments of the present invention, the guide portion is formed by protruding from the inner wall surface of the cavity in a direction away from the central axis of the cavity.

[0012] According to some embodiments of the present invention, the inner wall surface of the guide portion is composed of one or more curved surfaces.

[0013] According to some embodiments of the present invention, the height of the guide portion in the first direction is 1 / 8 to 1 of the height of the cavity in the first direction.

[0014] According to some embodiments of the present invention, a plurality of fluid branches are arranged along the length of the cavity, and the plurality of fluid branches include a first fluid branch, a second fluid branch, a third fluid branch and a fourth fluid branch arranged sequentially in a direction away from the main fluid pipe, and the flow guide is opposite to the first fluid branch and the second fluid branch.

[0015] According to some embodiments of the present invention, the point of the flow guide that is furthest from the central axis of the cavity is located between the first fluid branch and the second fluid branch; or, the point of the flow guide that is furthest from the central axis of the cavity is opposite to the first fluid branch.

[0016] According to some embodiments of the present invention, one end of the guide portion away from the fluid main pipe is located between the second fluid branch pipe and the third fluid branch pipe; or, one end of the guide portion away from the fluid main pipe is opposite to the second fluid branch pipe.

[0017] According to some embodiments of the present invention, the connection point between the side wall of the first fluid branch pipe adjacent to the fluid main pipe and the cavity is located on the side of the first fluid branch pipe away from the connection point between the side wall of the first fluid branch pipe and the cavity, closer to the central axis of the cavity.

[0018] According to some embodiments of the present invention, the distance between the connection point of the side wall of the first fluid branch pipe adjacent to the fluid main pipe and the cavity and the connection point of the side wall of the first fluid branch pipe away from the fluid main pipe and the cavity in the first direction is L, wherein L satisfies: 1mm≤L≤50mm.

[0019] An engine according to a second aspect of the present invention includes an intake manifold according to a first aspect of the present invention.

[0020] A vehicle according to a third aspect of the present invention includes an engine according to a second aspect of the present invention.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of an intake manifold according to an embodiment of the present invention;

[0024] Figure 2 This is a front view of the intake manifold according to an embodiment of the present invention;

[0025] Figure 3 yes Figure 2 An enlarged view of part A, shown in the center circle;

[0026] Figure 4 This is a top view of the intake manifold according to an embodiment of the present invention;

[0027] Figure 5 This is a right view of the intake manifold according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of an intake manifold according to another embodiment of the present invention;

[0029] Figure 7 This is a front view of an intake manifold according to another embodiment of the present invention;

[0030] Figure 8 yes Figure 7 An enlarged view of section B, shown in the center circle;

[0031] Figure 9 This is a top view of an intake manifold according to another embodiment of the present invention;

[0032] Figure 10 This is a right view of an intake manifold according to another embodiment of the present invention.

[0033] Figure label:

[0034] 100. Intake manifold;

[0035] 1. Cavity; 11. Guide section; 12. Vortex zone; 13. Inlet end;

[0036] 2. Fluid branch pipe; 21. First fluid branch pipe; 22. Second fluid branch pipe;

[0037] 23. Third fluid branch pipe; 24. Fourth fluid branch pipe;

[0038] 3. Fluid main pipe. Detailed Implementation

[0039] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-10 An intake manifold 100 according to an embodiment of the present invention is described. In the following description of this application, the intake manifold 100 is illustrated using an Atkinson cycle engine as an example, but is not limited thereto.

[0040] like Figure 1 , Figure 2 and Figure 6 As shown, the intake manifold 100 according to a first aspect embodiment of the present invention includes a cavity 1, a plurality of fluid branch pipes 2, and a fluid main pipe 3. In the description of the present invention, "a plurality of" means two or more.

[0041] Specifically, the cavity 1 has an air inlet end 13, and a guide portion 11 is formed on the cavity 1. The guide portion 11 is located in the cavity 1 along a first direction (e.g., Figure 1 On one side of the cavity 1 (shown in the up-down direction), multiple fluid branch pipes 2 are connected to the other side of the cavity 1 along the first direction, and all multiple fluid branch pipes 2 are in communication with the cavity 1. The cavity 1 has a hollow structure, and the hollow cavity is also a pressure-stabilizing cavity. For example, in... Figures 1-4In the example, cavity 1 extends in a left-right direction, and air inlet 13 is located at the right end of cavity 1. Guide section 11 is located on the upper side of cavity 1 along a first direction, and the upper ends of multiple fluid branch pipes 2 are connected to the lower side of cavity 1 along the first direction. Figure 6 In the example, the flow guide 11 is located on the rear side of the cavity 1, and the upper ends of the multiple fluid branch pipes 2 are all connected to the lower side of the cavity 1 along the first direction. This facilitates fluid flow between the cavity 1 and the fluid branch pipes 2, thereby improving the smoothness of fluid flow. It should be noted that the number and arrangement of the fluid branch pipes 2 can be specifically set according to actual conditions to better meet practical applications.

[0042] Reference Figures 1-4 The guide section 11 is opposite to at least one of the plurality of fluid branch pipes 2 adjacent to the air inlet 13. The cavity 1 forms a vortex region 12 at the guide section 11 and at least one of the plurality of fluid branch pipes 2 adjacent to the air inlet 13. The vortex region 12 is adapted to cause the fluid entering from the air inlet 13 to form a vortex in the vortex region 12 (the flow path of the fluid in the vortex region 12 is as follows). Figure 3 (The direction indicated by the middle arrow C).

[0043] For example, in Figures 1-4 In the example, the fluid can communicate with the cavity 1 through the intake end 13. The flow path of the fluid flowing into the intake manifold 100 from the intake end 13 is roughly as follows: the fluid enters the cavity 1 along the intake end 13 and flows into the guide section 11, and then the fluid flows into the cylinders of the engine corresponding to the multiple fluid branch pipes 2 (not shown in the figure). During this process, the flow direction of the fluid flowing into the cavity 1 from the intake end 13 changes after contacting the inner wall surface of the guide section 11, and a low-velocity vortex region 12 is formed above the fluid branch pipe 2 near the intake end 13, and then flows into the multiple fluid branch pipes 2. Because the pressure in the vortex region 12 is greater than the pressure in the surrounding flow region, the backflow of the air-fuel mixture from the engine cylinder into the fluid branch pipe 2 is prevented from flowing into the cavity 1. This also prevents the backflow of the air-fuel mixture from the fluid branch pipe 2 adjacent to the intake end 13 into other fluid branch pipes 2, thus avoiding significant differences in the air-fuel mixture concentration flowing from each fluid branch pipe 2 into each cylinder. It should be noted that the engine can also be an Atkinson engine, an engine with port injection (FPI) premixing, or a Miller cycle turbocharged engine. Therefore, this design uses fluid dynamics principles to set up the guide section 11, ensuring a more uniform distribution of the fluid and air-fuel mixture flowing from the intake end 13 in each fluid branch pipe 2, resulting in consistent combustion in multiple cylinders and improving engine stability. Furthermore, the intake manifold 100 has a simple structure, neither increasing the complexity of the intake manifold 100 prototype processing nor increasing the processing cycle, thereby improving the production rate of the intake manifold 100.

[0044] According to the intake manifold 100 of the present invention, the fluid flowing in from the intake end 13 can form a vortex at the guide portion 11, which can prevent the oil-air mixture in the fluid branch pipe 2 adjacent to the intake end 13 from flowing into other fluid branch pipes 2 when air is intake from the fluid branch pipe 2 away from the intake end 13. This ensures the uniformity of the distribution of the fluid flowing in from the intake end 13 and the oil-air mixture in each fluid branch pipe 2, thereby ensuring the consistency of combustion in multiple cylinders in the engine and improving the stability of engine operation. In addition, the intake manifold 100 has a simple structure, which reduces the production cost of the intake manifold 100 and increases the production rate of the intake manifold 100.

[0045] According to some embodiments of the present invention, with reference to Figure 2 , Figure 3 , Figure 7 and Figure 8 The intake manifold 100 further includes a fluid main pipe 3, one end of which is connected to the intake end 13. The angle between the tangent on the side of the fluid main pipe 3 adjacent to the guide section 11 and the tangent on the side of the guide section 11 away from the central axis of the length direction of the cavity 1 is α, where α satisfies: 5°≤α≤80°.

[0046] For example, in Figure 2 and Figure 3 In the example, the fluid main 3 is connected to the air inlet 13, and the interior of the fluid main 3 communicates with the interior of the cavity 1 through the air inlet 13. The fluid main 3 and the cavity 1 are integrally formed. Thus, the fluid inside the fluid main 3 can flow into the cavity 1 through the air inlet 13. The angle between the tangent on the right side of the fluid main 3 and the tangent on the upper side of the guide portion 11 is α (for example, in another embodiment, in...). Figure 6In the example, when the guide section 11 is located on the rear side of the cavity 1, the angle between the tangent on the right side of the fluid main pipe 3 and the tangent on the rear side of the guide section 11 is α. When the angle α between the tangent on the side of the fluid main pipe 3 adjacent to the guide section 11 and the tangent on the side of the guide section 11 away from the central axis of the length direction of the cavity 1 is less than 5°, after the fluid enters the cavity 1 through the intake end 13 along the fluid main pipe 3, the impact force between the fluid and the inner wall of the guide section 11 is weakened, and the fluid is less likely to form a vortex in the vortex region 12, thereby reducing the vortex in the vortex region 12. Moreover, the pressure difference between the vortex region 12 and the surrounding fluid is smaller, and the oil-gas mixture in the fluid branch pipe 2 near the fluid main pipe 3 is more likely to flow into the cavity 1, causing the oil-gas mixture to enter the fluid branch pipe 2 away from the fluid main pipe 3, resulting in poorer engine fuel consumption. When the angle α between the tangent on the side of the fluid main pipe 3 adjacent to the guide section 11 and the tangent on the side of the guide section 11 away from the central axis of the length direction of the cavity 1 is greater than 80°, the angle between the fluid flowing from the fluid main pipe 3 and the tangent on the side of the guide section 11 away from the central axis of the length direction of the cavity 1 is too large, which is not conducive to the smooth flow of the fluid to the vortex zone 12, nor is it conducive to the smooth flow of the fluid into each fluid branch pipe 2.

[0047] Therefore, by setting the angle α between the tangent on the side of the fluid main 3 adjacent to the guide section 11 and the tangent on the side of the guide section 11 away from the central axis of the length direction of the cavity 1, which satisfies 5°≤α≤80°, the smoothness of the fluid flowing from the fluid main 3 into the fluid branch pipe 2 away from the fluid main 3 is improved. In addition, it facilitates the formation of vortices in the vortex region 12 by the fluid flowing from the fluid main 3, thereby effectively preventing the oil-air mixture in the fluid branch pipe 2 near the fluid main 3 from being drawn away by the fluid branch pipe 2 away from the fluid main 3 during intake, and improving the combustion consistency of multiple cylinders in the engine.

[0048] According to some embodiments of the present invention, a plurality of fluid branch pipes 2 are arranged along the length direction of the cavity 1. The angle between the tangent on the side of the fluid branch pipe 2 closest to the fluid main pipe 3 among the plurality of adjacent fluid branch pipes 2 is β, wherein β satisfies: 5°≤β≤80°.

[0049] For example, in Figure 2 and Figure 3 In the example, multiple fluid branch pipes 2 are connected to the lower side of the cavity 1, and the multiple fluid branch pipes 2 are arranged sequentially in the left-right direction. When the guide section 11 is located on the upper side of the cavity 1, the angle between the tangent of the left side wall of the main fluid pipe 3 and the central axis of the rightmost fluid branch pipe 2 is β (for example, in another embodiment, in...). Figure 8In the example, when the guide section 11 is located on the rear side of the cavity 1, the angle between the tangent of the left side wall of the fluid main pipe 3 and the central axis of the rightmost fluid branch pipe 2 is β. When the angle β between the tangent of the side of the fluid branch pipe 2 closest to the fluid main pipe 3 and the central axis of the fluid branch pipe 2 closest to the fluid main pipe 3 is less than 5°, the fluid entering the cavity 1 from the fluid main pipe 3 through the air inlet 13 is approximately perpendicular to the upper wall of the guide section 11, which is not conducive to the formation of vortex in the vortex region 12 and is not conducive to the smooth flow of fluid into each fluid branch pipe 2. When the angle β between the tangent on one side of the fluid branch pipe 2 closest to the fluid main pipe 3 and the central axis of the fluid branch pipe 2 closest to the fluid main pipe 3 is greater than 80°, the flow direction of the fluid flowing in from the fluid main pipe 3 is approximately on the same horizontal line as the central axis of the cavity 1. On the one hand, the impact force between the fluid flowing in from the fluid main pipe 3 and the inner wall of the guide section 11 after entering the cavity 1 through the intake end 13 is weakened, thereby reducing the vortex in the vortex zone 12 and the pressure difference between the vortex zone 12 and the surrounding fluid is smaller. Consequently, the oil-air mixture in the fluid branch pipe 2 near the fluid main pipe 3 is more likely to flow into the cavity 1, which can easily cause inconsistent combustion in the cylinders of the engine and worsen the engine fuel consumption. On the other hand, the fluid flowing in from the fluid main pipe 3 flows to the inlet of the fluid branch pipe 2 closest to the fluid main pipe 3, thereby reducing the uniformity of fluid distribution in each fluid branch pipe 2.

[0050] Therefore, by setting the angle β between the tangent on one side of the fluid branch pipe 2 closest to the fluid main pipe 3 and the central axis of the fluid branch pipe 2 closest to the fluid main pipe 3, which satisfies 5°≤β≤80°, it helps to improve the smoothness of fluid flow into the fluid branch pipe 2 away from the fluid main pipe 3. In addition, it is beneficial for the fluid to form vortices at the vortex zone 12, thereby further improving the uniformity of the fluid and oil-air mixture in each branch pipe 2, and further improving the combustion consistency of multiple cylinders in the engine.

[0051] According to some embodiments of the present invention, with reference to Figures 1-3 The guide section 11 is directly opposite at least one of the plurality of fluid branch pipes 2 adjacent to the main fluid pipe 3. For example, in Figure 2In the example, the guide section 11 is located above the cavity 1 and directly opposite at least one of the multiple fluid branch pipes 2 adjacent to the main fluid pipe 3. Therefore, a vortex region 12 is easily formed between the guide section 11 and at least one fluid branch pipe 2 adjacent to the main fluid pipe 3. The fluid flowing in from the main fluid pipe 3 changes direction upon contact with the inner wall of the guide section 11, forming a rotating vortex in the vertical direction. The fluid pressure in the vortex region 12 is greater than the fluid pressure in the fluid branch pipe 2 directly opposite the guide section 11, thus more effectively preventing the oil-gas mixture in the fluid branch pipe 2 directly opposite the guide section 11 from being extracted. This further prevents the mixture concentration in the fluid branch pipe 2 adjacent to the main fluid pipe 3 from being too low, and the mixture concentration in the fluid branch pipe 2 far from the main fluid pipe 3 from being too high, effectively reducing the impact of uneven oil-gas mixing on engine operation. In addition, while ensuring uniform mixing of oil and gas in each fluid branch pipe 2, only the volume of the cavity 1 at the end closest to the fluid main pipe 3 is larger, while the volume of the cavity 1 at the end furthest from the fluid main pipe 3 remains unchanged, making the overall volume of the intake manifold 100 moderate, which is beneficial for the use and installation of the intake manifold 100.

[0052] According to other embodiments of the present invention, refer to Figures 6-8 The guide section 11 is provided in the cavity 1 along the second direction (e.g. Figure 6 The second direction (in the forward / backward direction) is the side away from the fluid header 3, and the second direction is perpendicular to the first direction. For example, in Figure 6 In the example, the guide section 11 is located at the rear of the cavity 1, and the fluid main pipe 3 is opposite to the guide section 11. The fluid main pipe 3 extends obliquely to the guide section in a direction that is approximately perpendicular to the plane containing the vertical and horizontal directions, so as to facilitate the smooth flow of fluid to the guide section 11. Thus, when the fluid flowing in from the fluid main pipe 3 flows into the cavity 1, the fluid forms a vortex after contacting the rear wall surface of the guide section 11 in the cavity 1. This facilitates the formation of a rotating vortex zone 12 in the front-rear direction at the guide section 11, thereby improving the combustion consistency of multiple cylinders in the engine. In addition, the structure of the intake manifold 100 is enriched, and the setting position of the guide section 11 can be selected according to the installation position of the intake manifold 100, which is beneficial for the intake manifold 100 to be installed in different positions, and is more conducive to the use of the intake manifold 100.

[0053] According to some embodiments of the present invention, with reference to Figure 1 , Figure 5 , Figure 6 and Figure 10 The guide portion 11 is formed by protruding from the inner wall surface of the cavity 1 in a direction away from the central axis of the cavity 1. For example, in Figure 1 and Figure 5 In the example, the guide portion 11 is a bulge shape protruding upward from the inner wall surface of the cavity 1. Figure 6 and Figure 10In the example, the guide section 11 is a bulge shape protruding rearward from the inner wall of the cavity 1. This design, on the one hand, facilitates the formation of a vortex zone 12 by the fluid entering the cavity 1 through the air inlet 13 along the fluid main pipe 3 and colliding with the inner wall of the guide section 11. This prevents the fluid in the fluid branch pipe 2 adjacent to the fluid main pipe 3 from being drawn out when air is introduced from the fluid branch pipe 2 away from the fluid main pipe 3. On the other hand, the guide section 11 has a simple structure, requiring no additional components, which is beneficial for its formation.

[0054] Optionally, the inner wall surface of the flow guide 11 is composed of one or more curved surfaces. That is, the inner wall surface of the flow guide 11 can be a single curved surface, or it can be formed by multiple curved surfaces connected sequentially. With this configuration, when the inner wall surface of the flow guide 11 is composed of a single curved surface, the structure of the flow guide 11 is simple and easy to manufacture, thereby increasing the production rate of the flow guide 11. When the inner wall surface of the flow guide 11 is composed of multiple curved surfaces, the flow guide 11 can be configured in various shapes and sizes, allowing the shape and size of the flow guide 11 to be specifically set according to actual conditions, thus improving the adaptability of the flow guide 11.

[0055] According to some embodiments of the present invention, with reference to Figure 2 , Figure 3 and Figure 7 The height of the guide section 11 in the first direction is 1 / 8 to 1 / 2 of the height of the cavity 1 in the first direction. For example, in Figure 2 and Figure 7 In the example, the highest point of the guide section 11 (e.g., as shown in the image) Figure 3 The position of the solid circle G shown) and the position of the lowest point of the guide section 11 (for example, as shown) Figure 2 The distance between the solid circle D shown is 1 / 8 to 1 of the height of the stabilizing cavity in the vertical direction (including the endpoint value).

[0056] When the height of the guide section 11 in the first direction is less than 1 / 8 of the height of the cavity 1 in the first direction, the generated vortex is smaller. This makes it easier for the oil-gas mixture in the fluid branch pipe 2 adjacent to the fluid main pipe 3 to be drawn away during intake in the fluid branch pipe 2 far from the fluid main pipe 3. This causes the oil-gas mixture in the multiple fluid branch pipes 2 in the intake manifold 100 of the engine to interfere with each other, resulting in inconsistent combustion in multiple cylinders of the engine. When the height of the guide section 11 in the first direction is greater than the height of the cavity 1 in the first direction, the volume of the guide section 11 is larger, resulting in a larger overall structure of the intake manifold 100. This is not conducive to the installation and testing of the intake manifold 100 and is inconvenient for the spatial arrangement of the engine. Therefore, by setting the height of the guide section 11 in the first direction to be 1 / 8 to 1 of the height of the cavity 1 in the first direction, it helps to ensure that the fluid flows evenly into the multiple fluid branch pipes 2, and prevents the oil-gas mixture in the fluid branch pipes 2 adjacent to the fluid main pipe 3 from being drawn away by the fluid branch pipes 2 away from the fluid main pipe 3 during intake. This avoids mutual interference of the fluids in the multiple fluid branch pipes 2 in the engine's intake manifold 100, thereby ensuring consistent combustion in the multiple cylinders of the engine and improving the stability of engine operation. In addition, minimizing the volume of the cavity 1 is beneficial for the installation and arrangement of the intake manifold 100, which in turn facilitates the arrangement of various engine components, making the overall structure of the engine more compact and improving the installation and use of the engine. It should be noted that when the guide section 11 is located on the side of the cavity 1 away from the fluid main pipe 3 in the second direction, the height of the guide section 11 in the front-rear direction is 1 / 8 to 1 of the height of the cavity 1 in the second direction (including the endpoint value), which is beneficial for the installation and arrangement of the intake manifold 100, making the overall structure of the engine more compact and improving the installation and use of the engine.

[0057] Furthermore, referring to Figure 2 and Figure 7 Multiple fluid branch pipes are arranged along the length of the cavity 1 described in section 2. Each fluid branch pipe 2 includes a first fluid branch pipe 21, a second fluid branch pipe 22, a third fluid branch pipe 23, and a fourth fluid branch pipe 24 arranged sequentially in a direction away from the main fluid pipe 3. The guide section 11 is opposite to the first fluid branch pipe 21 and the second fluid branch pipe 22. For example, in... Figure 2 and Figure 7In the example, from right to left, the four fluid branches are: first fluid branch 21, second fluid branch 22, third fluid branch 23, and fourth fluid branch 24. This arrangement allows the fluid flowing into the main fluid pipe 3 to form a vortex above the inlets of the first and second fluid branch branches 21 and 22, preventing the oil-gas mixture in these branches from flowing back into the cavity 1. This avoids the oil-gas mixture being drawn away from the first and second fluid branch branches 21 and 22 when the third and fourth fluid branch branches 23 and 24 are intaked. Consequently, the distribution of fluid and oil-gas mixture in the first, second, third, and fourth fluid branch branches 21, 22, 23, and 24 is more consistent, resulting in more consistent combustion in the cylinders corresponding to these branches, thus improving the engine's reliability.

[0058] According to some embodiments of the present invention, with reference to Figure 2 The point of the guide section 11 furthest from the central axis of the cavity 1 is located between the first fluid branch pipe 21 and the second fluid branch pipe 22. This arrangement facilitates the formation of vortices above the inlets of the first fluid branch pipe 21 and the second fluid branch pipe 22, so that the pressure in the vortex region 12 is greater than the fluid pressure in the first fluid branch pipe 21 and the fluid pressure in the second fluid branch pipe 22, thereby contributing to a more uniform distribution of fluid and oil-gas mixture in the first fluid branch pipe 21, the second fluid branch pipe 22, the third fluid branch pipe 23, and the fourth fluid branch pipe 24.

[0059] According to other embodiments of the present invention, the point of the guide section 11 furthest from the central axis of the cavity 1 is opposite to the first fluid branch pipe 21. Since the first fluid branch pipe 21 is closer to the other fluid branch pipes 2 and the main fluid pipe 3 than the other fluid branch pipes 2, if the oil-gas mixture in the first fluid branch pipe 21 flows back into the cavity 1, the oil-gas mixture will flow with the fluid in the cavity 1 into the other fluid branch pipes 2. Therefore, by aligning the point of the guide section 11 furthest from the central axis of the cavity 1 with the first fluid branch pipe 21, it is beneficial to form a vortex above the inlet of the first fluid branch pipe 21, thereby increasing the effect of the vortex formed in the vortex region 12 on the oil-gas mixture in the first fluid branch pipe 21, making it less likely for the oil-gas mixture in the first fluid branch pipe 21 to flow into the cavity 1. Furthermore, it helps to reduce the length of the guide section 11 on the cavity 1, thereby reducing the volume of the intake manifold 100 and making the installation of the intake manifold 100 more convenient.

[0060] According to some embodiments of the present invention, with reference to Figure 2 The end of the guide section 11 furthest from the main fluid pipe 3 (e.g. Figure 2The solid circle D shown is located between the second fluid branch pipe 22 and the third fluid branch pipe 23. This arrangement facilitates the formation of vortices above the inlets of the first and second fluid branch pipes 21 and 22, and eliminates the need to form vortex zones 12 in the cavity 1 opposite to the third and fourth fluid branch pipes 23 and 24. When the fluid entering the cavity 1 from the main fluid pipe 3 flows to the third and fourth fluid branch pipes 23 and 24, it effectively prevents the extraction of the air-fuel mixture from the first and second fluid branch pipes 21 and 22, and also prevents backflow of the air-fuel mixture in the third and fourth fluid branch pipes 23 and 24. This ensures a uniform air-fuel mixture concentration in each fluid branch pipe 2, contributing to improved combustion consistency across multiple cylinders in the engine. Furthermore, it reduces the volume of the cavity 1 corresponding to the third and fourth fluid branch pipes 23 and 24, thereby reducing interference between the cavity 1 and other components during intake manifold 100 installation, making the installation and use of the intake manifold 100 more convenient.

[0061] According to other embodiments of the present invention, refer to Figure 9 The end of the guide section 11 furthest from the main fluid pipe 3 (e.g., as...) Figure 9 The position of the solid circle F shown is opposite to the second fluid branch pipe 22. This arrangement helps to reduce the length of the guide section 11 in the length direction of the cavity 1, that is, it can reduce the size of the guide section 11 in the left and right direction, thereby reducing the volume of the intake manifold 100, which in turn makes the arrangement of the various components of the engine more compact, so as to facilitate the installation of the intake manifold 100 in a space-constrained location, and also reduces the amount of material of the intake manifold 100, thus reducing the cost of using the intake manifold 100.

[0062] According to some embodiments of the present invention, with reference to Figure 2 and Figure 3 The connection between the side wall of the first fluid branch pipe 21 adjacent to the main fluid pipe 3 and the cavity 1 (e.g., as shown in the image). Figure 3 The solid circle H shown is located at the junction of the side wall of the first fluid branch pipe 21 away from the main fluid pipe 3 and the cavity 1 (for example, as shown). Figure 3 The location of the solid circle I shown is on the side closest to the central axis of cavity 1. For example, in Figure 2 and Figure 3In the example, the connection between the right side wall of the first fluid branch pipe 21 and the cavity 1 is located above the connection between the left side wall of the first fluid branch pipe 21 and the cavity 1. This arrangement ensures that the flow direction of the fluid flowing from the fluid main pipe 3 into the cavity 1 forms a certain angle with the central axis of the first fluid branch pipe 21. This allows the fluid to flow upwards at an angle after entering the cavity 1 along the fluid main pipe 3, thus preventing the fluid from directly entering the first fluid branch pipe 21. Furthermore, it drives the oil-gas mixture in the first fluid branch pipe 21 to flow into other fluid branch pipes 2, preventing uneven distribution of the oil-gas mixture in each fluid branch pipe 2.

[0063] According to some embodiments of the present invention, with reference to Figure 2 , Figure 3 , Figure 7 and Figure 8 The distance L in the first direction between the connection point of the side wall of the first fluid branch pipe 21 adjacent to the fluid main pipe 3 and the connection point of the side wall of the first fluid branch pipe 21 away from the fluid main pipe 3 and the cavity 1, wherein L satisfies: 1mm ≤ L ≤ 50mm. For example, in Figure 3 In the example, the distance between the connection point of the right side wall of the first fluid branch pipe 21 and the cavity 1 and the connection point of the left side wall of the first fluid branch pipe 21 and the cavity 1 in the first direction is L.

[0064] When the distance L in the first direction between the connection point of the side wall of the first fluid branch pipe 21 adjacent to the fluid main pipe 3 and the cavity 1 and the connection point of the side wall of the first fluid branch pipe 21 away from the fluid main pipe 3 and the cavity 1 is less than 1mm, the right side wall and the left side wall of the first fluid branch pipe 21 are roughly on the same horizontal line in the left and right directions. The fluid is not easy to form eddies. At the same time, the fluid is easy to directly mix with the oil-gas mixture in the first fluid branch pipe 21 and is easy to drive the oil-gas mixture in the first fluid branch pipe 21 to flow into other fluid branch pipes 2. This results in inconsistent gas-fuel mixture concentration in each fluid branch pipe 2, which in turn reduces the combustion consistency of each cylinder of the engine and affects the use of the engine.

[0065] When the distance L in the first direction between the connection point of the side wall of the first fluid branch pipe 21 adjacent to the fluid main pipe 3 and the cavity 1, and the connection point of the side wall of the first fluid branch pipe 21 away from the fluid main pipe 3 and the cavity 1, is greater than 50 mm, the length of the first fluid branch pipe 21 increases along the first direction, increasing the length of the intake manifold 100. However, the limited space in the engine makes the engine's spatial arrangement inconvenient. Furthermore, the increased spacing between the right and left walls of the first fluid branch pipe 21 reduces the volume of the vortex region 12, hindering the flow of fluid from the fluid main pipe 3. Therefore, by setting the distance L in the first direction between the connection point of the side wall of the first fluid branch pipe 21 adjacent to the fluid main pipe 3 and the cavity 1, and the connection point of the side wall of the first fluid branch pipe 21 away from the fluid main pipe 3 and the cavity 1, which satisfies 1 mm ≤ L ≤ 50 mm, it helps to avoid mutual suction interference between multiple cylinders in the engine, thereby improving the uniformity and combustion stability among multiple cylinders in the engine. Furthermore, it avoids the problem of the first intake branch pipe 21 being too long, which would be detrimental to the installation of the intake manifold 100. That is, through the design of the guide section 11, this application simultaneously takes into account the uniformity of air and oil in each intake branch pipe 2 of the intake manifold 100 within a limited arrangement space, while the intake manifold 100 has no low point, so there will be no condensation or icing problems.

[0066] The intake manifold 100 scheme for the Atkinson cycle engine with guide section 11 described in this application was prototyped and tested. The test results showed that the combustion consistency of each cylinder of the engine was excellent, proving the effectiveness of the guide section 11 in solving the cylinder interference problem of the intake manifold 100 in the Atkinson cycle engine. Furthermore, the guide section design is simple and does not increase the complexity of the intake manifold 100 prototype processing, nor does it increase the prototype processing cycle or cost. At the same time, the guide section 11 can minimize the volume and length of the intake manifold 100, making it suitable for compact engine layouts and allowing for flexible arrangement.

[0067] According to some embodiments of the present invention, at least one guide plate (not shown) is provided on the inner wall surface of the cavity 1. For example, when the oil-gas mixture in the fluid branch pipe 2 flows back into the cavity 1, the oil-gas mixture flows back into the corresponding fluid branch pipe 2 under the action of the guide plate, thereby avoiding mixing of the oil-gas mixture in each fluid branch pipe 2 and improving the combustion consistency of each cylinder of the engine. In addition, after the fluid enters the cavity 1 along the fluid main pipe 3, the fluid flows along the guide plate into the fluid branch pipe 2 away from the fluid main pipe 3, improving the uniformity of fluid distribution in each fluid branch pipe 2.

[0068] An engine (not shown) according to a second aspect embodiment of the present invention includes an intake manifold 100 according to a first aspect embodiment of the present invention.

[0069] According to an embodiment of the present invention, by employing the above-described intake manifold 100, the combustion of multiple cylinders in the engine is made consistent, thereby improving the stability of engine operation.

[0070] A vehicle (not shown) according to a third aspect embodiment of the present invention includes an engine according to a second aspect embodiment of the present invention.

[0071] The vehicle according to an embodiment of the present invention improves its performance by employing the engine described above.

[0072] Other configurations and operations of the engine and vehicle according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0073] In the description of this invention, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right" and "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0074] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0075] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An intake manifold, characterized in that, include: The cavity has an air inlet end and a guide portion is formed on the cavity. The guide portion is located on one side of the cavity along a first direction. The guide portion is formed by protruding from the inner wall surface of the cavity toward a direction away from the central axis of the cavity. The inner wall surface of the guide portion is composed of multiple curved surfaces. Multiple fluid branches are connected to the other side of the cavity along the first direction, and the multiple fluid branches are in communication with the cavity. The flow guide is opposite to at least one of the plurality of fluid branches adjacent to the air inlet end, and the cavity forms a vortex region at the at least one of the flow guide and the plurality of fluid branches adjacent to the air inlet end, the vortex region being adapted to cause the fluid entering from the air inlet end to form a vortex in the vortex region. A fluid main pipe, one end of which is connected to the air inlet, and a guide section opposite to at least one of the plurality of fluid branch pipes adjacent to the air inlet. The fluid branch pipe is arranged adjacent to the fluid main pipe, and the connection point between the side wall of the fluid branch pipe near the fluid main pipe and the cavity is located on the side of the connection point between the other side wall of the fluid branch pipe away from the fluid main pipe and the cavity, closer to the central axis of the cavity. The angle between the tangent line through the fluid main pipe on the side adjacent to the guide section and the tangent line through the guide section on the side away from the central axis of the length direction of the cavity is α, wherein α satisfies: 5°≤α≤80°.

2. The intake manifold according to claim 1, characterized in that, The plurality of fluid branches are arranged along the length of the cavity. The angle between the tangent on one side of the fluid branch closest to the fluid main pipe and the central axis of the fluid branch closest to the fluid main pipe is β, wherein β satisfies: 5°≤β≤80°.

3. The intake manifold according to claim 1, characterized in that, The flow guide is directly opposite at least one of the plurality of fluid branch pipes adjacent to the fluid main pipe; or The flow guide is located on the side of the cavity away from the main fluid pipe along a second direction, which is perpendicular to the first direction.

4. The intake manifold according to claim 1, characterized in that, The height of the guide section in the first direction is 1 / 8 to 1 / 8 of the height of the cavity in the first direction.

5. The intake manifold according to any one of claims 1-4, characterized in that, The plurality of fluid branch pipes are arranged along the length of the cavity, including a first fluid branch pipe, a second fluid branch pipe, a third fluid branch pipe and a fourth fluid branch pipe arranged sequentially in a direction away from the main fluid pipe, and the flow guide is opposite to the first fluid branch pipe and the second fluid branch pipe.

6. The intake manifold according to claim 5, characterized in that, The point of the flow guide that is furthest from the central axis of the cavity is located between the first fluid branch and the second fluid branch; or The point of the flow guide that is furthest from the central axis of the cavity is opposite to the first fluid branch pipe.

7. The intake manifold according to claim 5, characterized in that, The end of the flow guide that is furthest from the main fluid pipe is located between the second fluid branch pipe and the third fluid branch pipe; or The end of the guide section away from the main fluid pipe is opposite to the second fluid branch pipe.

8. The intake manifold according to claim 5, characterized in that, The distance L in the first direction between the connection point of the side wall of the first fluid branch pipe adjacent to the fluid main pipe and the connection point of the side wall of the first fluid branch pipe away from the fluid main pipe and the cavity is: 1mm≤L≤50mm.

9. An engine, characterized in that, Includes the intake manifold according to any one of claims 1-8.

10. A vehicle, characterized in that, Including the engine according to claim 9.

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