Intake manifold, engine and vehicle

Abstract

The utility model provides an air inlet manifold, an engine and a vehicle, the air inlet manifold is used for air flow circulation, the air inlet manifold comprises an air inlet, an air inlet cavity and an air outlet which are communicated in sequence, the air inlet is used for allowing the air flow to flow in, and the air outlet is used for allowing the air flow to flow out; a flow limiting structure is arranged in the air inlet cavity and used for providing a flow limiting effect on airflow in the air inlet cavity. According to the intake manifold, the engine and the vehicle, the flowing uniformity of airflow in the intake manifold and the NVH performance of the engine can be improved.

Description

Technical Field

[0001] The present application belongs to the field of engine air intake, and in particular, relates to an intake manifold, an engine and a vehicle. Background Art

[0002] The intake manifold is one of the main parts of the engine's intake pipe. One end of the intake manifold is connected to the air filtered from the external environment, and the other end is connected to the engine's cylinder. The air filtered from the external environment is compressed by the supercharger, enters the intake manifold from the intake port of the intake manifold, and then enters each cylinder of the engine. The intake port is generally arranged at the end of the intake manifold, and the air enters from the intake port at one end of the intake manifold. Since the diameter of the intake ports of each cylinder through which the air flows is the same, and the air compressed by the supercharger has a high flow rate in the intake manifold, the air tends to gather at the end far away from the intake port of the intake manifold, resulting in the cylinder at the end far away from the intake port of the intake manifold to easily get relatively more air, while the intake volume of the cylinder close to the intake port of the intake manifold is relatively small. As a result, it is easy to cause uneven airflow from the intake manifold to each cylinder, which in turn leads to uneven combustion of each cylinder, which will increase the noise and vibration of the engine. Utility Model Content

[0003] In order to address the deficiencies in the prior art, the present application provides an intake manifold, an engine and a vehicle, which can improve the uniformity of airflow in the intake manifold and the NVH performance of the engine.

[0004] On the one hand, the present application provides an intake manifold for air circulation, comprising an air inlet, an air inlet cavity and an air outlet connected in sequence, the air inlet being used for the air flow to flow in, and the air outlet being used for the air flow to flow out; a flow limiting structure is provided in the air inlet cavity, and the flow limiting structure is used to provide a flow limiting effect on the air flow in the air inlet cavity.

[0005] In a possible embodiment, the flow limiting structure divides the air inlet cavity into a first cavity and a second cavity that are connected to each other, the first cavity and the second cavity are arranged sequentially along a first direction, and the air inlet, the first cavity and the second cavity are connected in sequence; the air outlet includes a first air outlet area and a second air outlet area, the first air outlet area and the second air outlet area are arranged sequentially along the first direction, the first air outlet area and the first cavity are connected, and the second air outlet area and the second cavity are connected.

[0006] In a possible implementation manner, the flow limiting structure and the air inlet cavity are integrally formed.

[0007] In a possible embodiment, the current limiting structure includes a first connecting surface, a second connecting surface and a third connecting surface, and the third connecting surface is connected between the first connecting surface and the second connecting surface; the first connecting surface is connected to the inner side wall of the air inlet cavity and is inclined relative to the inner side wall of the air inlet cavity, the second connecting surface is connected to the inner side wall of the air inlet cavity and is inclined relative to the inner side wall of the air inlet cavity, the first connecting surface is set toward the first cavity, and the second connecting surface is set toward the second cavity.

[0008] In a possible implementation manner, an inclination angle between the first connecting surface and the inner side wall of the air inlet cavity is θ1, and an inclination angle between the second connecting surface and the inner side wall of the air inlet cavity is θ2, where θ1>θ2.

[0009] In a possible implementation manner, the inclination angle between the first connecting surface and the inner side wall of the air inlet cavity is in the range of [130°, 150°], and the inclination angle between the second connecting surface and the inner side wall of the air inlet cavity is in the range of [120°, 140°].

[0010] In a possible implementation manner, the current limiting structure further includes a third connecting surface connected between the first connecting surface and the second connecting surface, and the third connecting surface extends along the first direction.

[0011] In a possible implementation manner, an extension length range of the third connecting surface in the first direction is [20 mm, 40 mm].

[0012] In a possible implementation, the current limiting structure further includes a first arc surface, which is connected between the first connecting surface and the third connecting surface; and / or, the current limiting structure further includes a second arc surface, which is connected between the second connecting surface and the third connecting surface.

[0013] In a possible implementation, the first arc surface is a rounded corner, and the radius of the first arc surface is in the range of [10 mm, 20 mm]; the second arc surface is a rounded corner, and the radius of the second arc surface is in the range of [10 mm, 20 mm].

[0014] In a possible embodiment, the intake manifold includes a tube body that surrounds the intake cavity; the tube body includes a first inner wall surface, the flow limiting structure is arranged on the first inner wall surface, the air outlet is arranged relative to the first inner wall surface along a second direction, the second direction is different from the first direction, and the flow limiting structure and the air outlet are on both sides of the first direction.

[0015] In a possible implementation manner, a protruding height range of the flow-limiting structure from the first inner wall surface toward the air outlet is [10 mm, 15 mm].

[0016] In a possible implementation manner, the outer surface of the tube body has reinforcing ribs.

[0017] In another aspect, the present application provides an engine, comprising:

[0018] The intake manifold described above.

[0019] In another aspect, the present application provides a vehicle, comprising:

[0020] The above engine or the above intake manifold.

[0021] The intake manifold, engine and vehicle provided by the present application are provided with a flow-limiting structure on the inner side wall of the intake cavity of the intake manifold, and the flow-limiting structure divides the intake cavity into two interconnected cavities. Since the flow-limiting structure can block part of the airflow, a part of the airflow flowing in from the air inlet flows out from a part of the air outlet through the cavity close to the air inlet, and another part of the airflow flows out from another part of the air outlet through the cavity far from the air inlet. Compared with the smooth inner wall of the intake cavity in the traditional intake manifold, the intake manifold provided by the present application is designed with a flow-limiting structure. On the one hand, part of the air flows out from a part of the outlet through the cavity close to the air inlet, and the other part of the air flows out from another part of the outlet through the cavity far from the air inlet, which is conducive to improving the uniformity of the overall outflow of the outlet, thereby making the intake uniformity of the multiple cylinders connected to the outlet better, so that each cylinder connected to the outlet can be fully burned, which is conducive to improving the combustion efficiency of the cylinder combustion, and reducing the vibration and noise generated by the cylinder during operation. On the other hand, the flow-limiting structure divides the inner wall of the intake cavity of the intake manifold into multiple modes, avoiding the appearance of a large area of ​​smooth surface on the inner wall of the intake cavity of the intake manifold, which is conducive to improving the NVH performance of the intake manifold itself under the action of airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some implementation methods provided by the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 is a front view of an intake manifold provided by an embodiment of the present application;

[0024] Figure 2is a top view of an intake manifold provided in one embodiment of the present application;

[0025] Figure 3 is a bottom view of an intake manifold provided by an embodiment of the present application;

[0026] Figure 4 yes Figure 2 The intake manifold is shown in cross-section at AA;

[0027] Figure 5 yes Figure 1 The cross-section of the intake manifold at BB is shown;

[0028] Figure 6 yes Figure 1 The cross-section of the intake manifold at CC is shown;

[0029] Figure 7 yes Figure 1 A cross-section of the intake manifold at DD is shown.

[0030] Description of Figure Numbers:

[0031] Intake manifold 100, air inlet 10, air inlet cavity 20, first cavity 21, second cavity 22, air outlet 30, first air outlet area 31, second air outlet area 32, flow limiting structure 40, first connecting surface 41, second connecting surface 42, third connecting surface 43, first curved surface 44, second curved surface 45, tube body 50, first inner wall surface 51, reinforcing rib 52. DETAILED DESCRIPTION

[0032] The technical solution of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described implementation methods are only part of the implementation methods of the present application, rather than all the implementation methods. Based on the implementation methods in the present application, all other implementation methods obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0033] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The directional terms mentioned in the description of the present application, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "top", "side", "bottom", "top wall", "side wall", "bottom wall", "inner side wall", "outer side wall", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, for example, "first", "second", "third", "fourth", etc., are only used to distinguish the objects described and do not have any order or technical meaning. In the description of the present application, the "connection" and "connection" involved, unless otherwise specified, include direct connection (connection) and indirect connection (connection).

[0034] The present application provides a vehicle, the vehicle includes an engine, the engine is used to provide a power source for the vehicle. Alternatively, the vehicle includes an intake manifold, the intake manifold is used to supply airflow to a plurality of cylinders, so that each cylinder of the engine can burn and generate power under the action of the airflow.

[0035] The present application provides an engine, which includes an intake manifold and a plurality of cylinders. The intake manifold is used for supplying airflow and delivering airflow to the plurality of cylinders so that each cylinder can burn and generate power under the action of the airflow.

[0036] In the engine provided in the present application, the intake manifold is improved so that the airflow delivered by the intake manifold to each cylinder is more uniform, so that each cylinder can produce sufficient combustion, thereby reducing the vibration and noise of the engine and also helping to improve the overall performance of the engine.

[0037] The intake manifold provided in this application is introduced in detail below.

[0038] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 is a front view of an intake manifold provided in one embodiment of the present application, Figure 2 is a top view of an intake manifold provided in one embodiment of the present application, Figure 3 is a bottom view of an intake manifold provided in one embodiment of the present application, Figure 4 yes Figure 2 A cross-section of the intake manifold at AA is shown.

[0039] In this embodiment, the intake manifold 100 includes an intake port 10, an intake cavity 20, and an outlet 30 that are connected in sequence. The intake port 10 is used to supply airflow into the intake cavity 20 of the intake manifold 100, and the outlet 30 is used to supply airflow out of the intake cavity 20 of the intake manifold 100. The intake cavity 20 extends along a first direction, and the extending direction of the intake cavity 20 is inclined relative to the outlet direction of the outlet 30.

[0040] Among them, since in the existing intake manifold, the air inlet, the air inlet cavity and the air outlet are connected in sequence, therefore, when the air flows, the subsequent airflow will push the airflow to flow toward the position of the air inlet cavity away from the air inlet, causing the airflow in the air inlet cavity to have a component velocity from close to the air inlet to away from the air inlet. Under the action of the component velocity, there is an uneven airflow between the position of the air inlet cavity close to the air inlet and the position of the air inlet cavity away from the air inlet, which leads to the problem of uneven air outlet between the area of ​​the air outlet close to the air inlet and the area of ​​the air outlet away from the air inlet.

[0041] Based on this, in the intake manifold 100 provided by the present application, a flow limiting structure 40 is provided in the intake cavity 20, and the flow limiting structure 40 is used to provide a flow limiting effect on the airflow in the intake cavity 20. By providing the flow limiting structure 40 on the inner side wall of the intake cavity 20 of the intake manifold 100, the flow limiting structure 40 divides the intake cavity 20 into two interconnected cavities. Since the flow limiting structure 40 can block part of the airflow, a part of the airflow flowing in from the air inlet 10 flows out from a part of the air outlet 30 through the cavity close to the air inlet 10, and another part of the airflow flows out from another part of the air outlet 30 through the cavity far away from the air inlet 10. Compared with the smooth inner wall of the intake cavity 20 in the conventional intake manifold 100, the intake manifold 100 provided in the present application is designed with a flow-limiting structure 40. On the one hand, part of the air flows out from a part of the outlet 30 through the cavity close to the intake port 10, and the other part of the air flows out from another part of the outlet 30 through the cavity far from the intake port 10, which is conducive to improving the uniformity of the overall outflow of the outlet 30, thereby making the intake uniformity of the multiple cylinders connected to the outlet 30 better, so that each cylinder connected to the outlet 30 can be fully burned, which is conducive to improving the combustion efficiency of the cylinder combustion, and reducing the vibration and noise generated by the cylinder during operation. On the other hand, the flow-limiting structure 40 divides the inner wall of the intake cavity 20 of the intake manifold 100 into multiple modes, avoiding the appearance of a large area of ​​smooth surface on the inner wall of the intake cavity 20 of the intake manifold 100, which is conducive to improving the NVH performance of the intake manifold 100 itself under the action of airflow.

[0042] See also Figure 1 , Figure 2 , Figure 3 and Figure 4In a specific embodiment, the flow limiting structure 40 separates the air intake cavity 20 into a first cavity 21 and a second cavity 22. The first cavity 21 and the second cavity 22 are arranged in the air intake cavity 20 at intervals and in communication along the first direction. The air intake port 10, the first cavity 21, the second cavity 22 and the air outlet 30 are arranged in communication in sequence. The air outlet 30 includes a first air outlet area 31 and a second air outlet area 32. The first air outlet area 31 and the second air outlet area 32 are arranged in sequence along the first direction. The first air outlet area 31 is in communication with the first cavity 21 along the second direction, and the second air outlet area 32 is in communication with the second cavity 22 along the second direction. Part of the air flow flowing in from the air intake port 10 flows into part of the cylinders of the engine from the first air outlet area 31 after passing through the first cavity 21, and another part of the air flow flowing in from the air intake port 10 flows into another part of the cylinders of the engine from the second air outlet area 32 after passing through the first cavity 21 and the second cavity 22.

[0043] The intake manifold 100 and the engine provided in this embodiment are provided with a flow limiting structure 40 on the inner side wall of the intake cavity 20 of the intake manifold 100. The flow limiting structure 40 divides the intake cavity 20 into a first cavity 21 and a second cavity 22 which are connected and spaced apart in the extending direction of the intake cavity 20. Since the flow limiting structure 40 can block part of the airflow, a part of the airflow flowing in from the air inlet 10 flows out from the first outlet region 31 through the first cavity 21, and another part flows out from the second outlet region 32 through the first cavity 21 and the second cavity 22. Compared with the traditional intake manifold 100 in which the inner wall of the intake cavity 20 is smooth, the intake manifold 100 provided in the present application is designed with a flow limiting structure 40 so that air flows out from the first outlet area 31 of the outlet 30 corresponding to the first cavity 21 and the second outlet area 32 of the outlet 30 corresponding to the second cavity 22, which is beneficial to improving the uniformity of the overall outflow of the outlet 30, thereby making the intake uniformity in the cylinders respectively connected to the first outlet area 31 and the second outlet area 32 of the outlet 30 better, so that each cylinder respectively connected to the first outlet area 31 and the second outlet area 32 of the outlet 30 can be fully burned, which is beneficial to improving the combustion efficiency of the cylinder combustion and reducing the vibration and noise generated by the cylinder operation.

[0044] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In a specific embodiment, the intake manifold 100 includes a tube body 50 surrounding the intake cavity 20. The tube body 50 includes a first inner wall surface 51, and the first inner wall surface 51 is arranged opposite to the air outlet 30 along a second direction, and the second direction is perpendicular to the first direction. The flow limiting structure 40 is arranged on the first inner wall surface 51, and the flow limiting structure 40 and the air outlet 30 are arranged on both sides of the extension direction of the intake cavity 20. Specifically, as Figure 4As shown, the extension direction of the air inlet cavity 20 is the first direction, and the opposite sides of the air inlet cavity 20 along the extension direction are the upper and lower sides of the air inlet cavity 20, that is, the flow limiting structure 40 is arranged on the upper and lower sides of the air inlet cavity 20. By arranging the flow limiting structure 40 on the first inner wall surface 51 of the air inlet cavity 20, that is, the flow limiting structure 40 and the air outlet 30 are arranged relatively along the second direction, so that the first air outlet area 31 of the air outlet 30 corresponding to the first cavity 21 and the second air outlet area 32 of the air outlet 30 corresponding to the second cavity 22 both have airflow flowing out, which is conducive to improving the uniformity of the overall outflow of the air outlet 30, and thus making the intake uniformity of the cylinders respectively connected to the first air outlet area 31 and the second air outlet area 32 of the air outlet 30 better.

[0045] More specifically, the range of the protruding height of the flow-limiting structure 40 is [10 mm, 15 mm], wherein the protruding height of the flow-limiting structure 40 is the protruding height of the flow-limiting structure 40 from the first inner wall surface 51 forming the air inlet cavity 20 toward the air outlet 30, that is, the protruding height of the flow-limiting structure 40 along the second direction. By limiting the protruding height of the flow-limiting structure 40 to be greater than or equal to 10 mm, it is avoided that the flow-limiting structure 40 has a small protruding height in the air inlet cavity 20 and cannot form an effective flow-limiting effect, thereby avoiding the airflow in the second cavity 22 being significantly greater than the airflow in the first cavity 21, resulting in uneven air discharge in the first air outlet area 31 and the second air outlet area 32 of the air outlet 30. By limiting the protruding height of the flow limiting structure 40 to be less than or equal to 15 mm, it is possible to avoid excessive flow limiting effect due to the large protruding height of the flow limiting structure 40 in the air inlet cavity 20, thereby avoiding the situation where the air flow in the first cavity 21 is significantly greater than the air flow in the second cavity 22, resulting in uneven air outlet in the first air outlet area 31 and the second air outlet area 32 of the air outlet 30.

[0046] More specifically, a plurality of reinforcing ribs 52 are disposed on the outer surface of the tube body 50, and the plurality of reinforcing ribs 52 are arranged in a staggered manner on the tube body 50. The provision of the reinforcing ribs 52 can, on the one hand, improve the strength of the tube body and the intake manifold 100. On the other hand, since the airflow in the tube body 50 generates vibration, the reinforcing ribs 52 separate the surface of the tube body 50 into a plurality of independent planes, which is conducive to reducing the noise generated by the tube body 50 due to resonance.

[0047] In a specific embodiment, the flow limiting structure 40 is integrally formed with the tube body 50 surrounding the air inlet cavity 20. The flow limiting structure 40 is integrally formed with the tube body 50 surrounding the air inlet cavity 20, that is, the flow limiting structure 40 can be produced with the tube body 50 by a casting process, which is conducive to improving production efficiency. Moreover, the flow limiting structure 40 is integrally formed with the tube body 50, which is conducive to improving the stability of the flow limiting structure 40 on the air inlet cavity 20 of the tube body 50, and preventing the flow limiting structure 40 from detaching from the air inlet cavity 20 and causing the flow limiting failure.

[0048] It can be understood that in some other embodiments, the flow limiting structure 40 and the tube body 50 surrounding the air inlet cavity 20 are separately provided and are formed into a whole through a fixed connection, and the present application does not impose any limitation on this.

[0049] In one embodiment, the flow limiting structure 40 is in a "V" shape, and the flow limiting structure 40 includes a first connecting surface 41 and a second connecting surface 42, and the first connecting surface 41 and the second connecting surface 42 are connected. The side of the first connecting surface 41 away from the second connecting surface 42 is connected to the inner side wall of the air inlet cavity 20 (the first inner wall surface 51 of the tube body 50), and the first connecting surface 41 is inclined relative to the inner side wall of the air inlet cavity 20 (the first inner wall surface 51 of the tube body 50). The side of the second connecting surface 42 away from the first connecting surface 41 is connected to the inner side wall of the air inlet cavity 20 (the first inner wall surface 51 of the tube body 50), and the second connecting surface 42 is inclined relative to the inner side wall of the air inlet cavity 20 (the first inner wall surface 51 of the tube body 50). The flow-limiting structure 40 is in a "V" shape. Along the flow direction of the airflow, when the airflow flows from the air inlet 10 into the first cavity 21, due to the effect of the first connecting surface 41, the flow area of ​​the airflow in the air inlet cavity 20 gradually decreases, and part of the airflow stays in the first cavity 21, and this part of the airflow flows out to the cylinder of the engine at the first outlet area 31 of the air outlet 30 corresponding to the first cavity 21. Another part of the airflow enters the second cavity 22 from the first cavity 21 at the connection between the first connecting surface 41 and the second connecting surface 42, and this part of the airflow flows out to the cylinder of the engine at the second outlet area 32 of the air outlet 30 corresponding to the second cavity 22. As a result, airflow in the first cavity 21 and the second cavity 22 flows into different cylinders through the first outlet area 31 and the second outlet area 32 of the air outlet 30, which is beneficial to improve the uniformity of the airflow flowing out of the air outlet 30, and thus make the intake uniformity in the multiple cylinders connected to the air outlet 30 better, so that each cylinder connected to the air outlet 30 can burn fully, which can reduce the vibration and noise generated by the operation of the cylinder.

[0050] Optionally, the first connecting surface 41 is a plane, and the second connecting surface 42 is a plane; or, the first connecting surface 41 is a curved surface, and the second connecting surface 42 is a plane; or, the first connecting surface 41 is a plane, and the second connecting surface is a curved surface; or, the first connecting surface 41 is a curved surface, and the second connecting surface 42 is a curved surface; this application does not impose any restrictions on this.

[0051] It can be understood that in some other embodiments, in order to prevent the airflow from generating vortices after entering the second cavity 22 from the first cavity 21 at the connection between the first connecting surface 41 and the second connecting surface 42, a curved transition can be designed between the first connecting surface 41 and the second connecting surface 42.

[0052] In one embodiment, the first connecting surface 41 is a plane, the second connecting surface 42 is a plane, the inclination angle between the first connecting surface 41 and the inner wall of the air inlet cavity 20 (the first wall surface 51 of the tube body 50) is θ1, and the inclination angle between the second connecting surface 42 and the inner wall of the air inlet cavity 20 (the first wall surface 51 of the tube body 50) is θ2, and θ1>θ2. By limiting the inclination angle θ1 between the first connecting surface 41 and the inner wall of the air inlet cavity 20 (the first wall surface 51 of the tube body 50) to be greater than the inclination angle θ2 between the second connecting surface 42 and the inner wall of the air inlet cavity 20 (the first wall surface 51 of the tube body 50), that is, the first connecting surface 41 is closer to the first direction than the second connecting surface 42, and the slope of the first connecting surface 41 is smaller than the slope of the second connecting surface 42, so that the resistance of the airflow flowing in from the air inlet 10 from the first cavity 21 to the second cavity 22 is smaller, thereby making the airflow flowing into the second cavity 22 more, which is beneficial to improving the uniformity of the airflow in the first cavity 21 and the second cavity 22, and thereby improving the uniformity of the airflow flowing out from the first air outlet area 31 and the second cavity 22 of the air outlet 30 corresponding to the first cavity 21 to the second air outlet area 32 of the air outlet 30.

[0053] In a specific embodiment, the first connecting surface 41 is a plane, the second connecting surface 42 is a plane, the inclination angle between the first connecting surface 41 and the inner wall forming the air inlet cavity 20 (the first wall surface 51 of the tube body 50) is in the range of [130°, 150°], and the inclination angle between the second connecting surface 42 and the inner wall forming the air inlet cavity 20 (the first wall surface 51 of the tube body 50) is in the range of [120°, 140°]. By limiting the range of the inclination angle of the first connecting surface 41 relative to the inner wall of the air inlet cavity 20 (the first wall surface 51 of the tube body 50), and limiting the range of the inclination angle of the second connecting surface 42 relative to the inner wall of the air inlet cavity 20 (the first wall surface 51 of the tube body 50), it is possible to prevent the phenomenon that a large difference between the air flow in the first cavity 21 and the air flow in the second cavity 22 occurs due to the inclination angle of the first connecting surface 41 relative to the inner wall of the air inlet cavity 20 being too large or too small. As a result, the air flow flowing in from the air inlet 10 can be more evenly distributed in the first cavity 21 and the second cavity 22, which is beneficial to ensuring the uniformity of the air flow flowing out from the first air outlet area 31 and the second cavity 22 of the air outlet 30 corresponding to the first cavity 21 to the second air outlet area 32 of the air outlet 30.

[0054] Among them, in the present application, the range of the inclination angle is [130°, 150°]. In this embodiment, the inclination angle is equal to 130° or the inclination angle is equal to 150°; the following range expressions are similar, and the embodiments all include implementations in which the corresponding parameters are equal to the boundary values.

[0055] See also Figures 1 to 7 , Figure 5 yes Figure 1 The cross-section of the intake manifold at BB is shown. Figure 6 yes Figure 1 The cross-section of the intake manifold at CC is shown. Figure 7 yes Figure 1 A cross-section of the intake manifold at DD is shown.

[0056] In a specific embodiment, the flow limiting structure 40 includes a first connecting surface 41, a second connecting surface 42 and a third connecting surface 43, wherein the first connecting surface 41 is connected to the first inner wall surface 51 of the tube body 50 (the inner side wall of the air inlet cavity 20 opposite to the air outlet 30), and the first connecting surface 41 is inclined relative to the first inner wall surface 51 of the tube body 50. The second connecting surface 42 is connected to the first inner wall surface 51 of the tube body 50 (the inner side wall of the air inlet cavity 20 opposite to the air outlet 30), and the second connecting surface 42 is inclined relative to the first inner wall surface 51 of the tube body 50. The third connecting surface 43 is connected between the first connecting surface 41 and the second connecting surface 42, and the third connecting surface 43 extends along the first direction (the extension direction of the air inlet cavity 20).

[0057] The flow-limiting structure 40 includes a first connection surface 41, a third connection surface 43, and a second connection surface 42 connected in sequence. Along the flow direction of the airflow, when the airflow flows from the air inlet 10 into the first cavity 21, due to the effect of the first connection surface 41, the flow area of ​​the airflow in the air inlet cavity 20 gradually decreases, and part of the airflow will stay in the first cavity 21, and this part of the airflow will flow out to the cylinder of the engine at the first outlet area 31 of the air outlet 30 corresponding to the first cavity 21. Another part of the airflow enters the second cavity 22 from the first cavity 21 along the third connection surface 43, and this part of the airflow will flow out to the cylinder of the engine at the second outlet area 32 of the air outlet 30 corresponding to the second cavity 22. As a result, airflow in the first cavity 21 and the second cavity 22 flows into different cylinders through the first outlet area 31 and the second outlet area 32 of the air outlet 30, which is beneficial to improve the uniformity of the airflow flowing out of the air outlet 30, and thus make the intake uniformity in the multiple cylinders connected to the air outlet 30 better, so that each cylinder connected to the air outlet 30 can burn fully, which can reduce the vibration and noise generated by the operation of the cylinder.

[0058] In this embodiment, the first connection surface 41 is a plane, the second connection surface 42 is a plane, and the third connection surface 43 is a plane, and the third connection surface 43 extends along the first direction. In some other embodiments, the first connection surface 41 and the second connection surface 42 are planes, and the third connection surface 43 is a curved surface; or, the first connection surface 41 and the second connection surface 42 are curved surfaces, and the third connection surface 43 is a plane; or, the first connection surface 41, the second connection surface 42, and the third connection surface 43 are all curved surfaces; this application does not limit this.

[0059] It can be understood that in some other embodiments, the first connecting surface 41, the second connecting surface 42 and the third connecting surface 43 can be located on the same curved surface. In other words, the flow limiting structure 40 is semi-ellipsoidal or hemispherical as a whole. It is only necessary to ensure that the flow limiting structure 40 has a flow blocking effect on the flow from the air inlet 10 into the air inlet cavity 20. The present application does not impose any restrictions on this.

[0060] More specifically, in this embodiment, the first connecting surface 41 is a plane, the second connecting surface is a plane, the inclination angle between the first connecting surface 41 and the inner wall forming the air inlet cavity 20 (the first wall surface 51 of the tube body 50) is in the range of [130°, 150°], and the inclination angle between the second connecting surface 42 and the inner wall forming the air inlet cavity 20 (the first wall surface 51 of the tube body 50) is in the range of [120°, 140°]. By limiting the range of the inclination angle of the first connecting surface 41 relative to the inner wall of the air inlet cavity 20 (the first wall surface 51 of the tube body 50), and limiting the range of the inclination angle of the second connecting surface 42 relative to the inner wall of the air inlet cavity 20 (the first wall surface 51 of the tube body 50), it is possible to prevent the phenomenon that a large difference between the air flow in the first cavity 21 and the air flow in the second cavity 22 occurs due to the inclination angle of the first connecting surface 41 relative to the inner wall of the air inlet cavity 20 being too large or too small. As a result, the air flow flowing in from the air inlet 10 can be more evenly distributed in the first cavity 21 and the second cavity 22, which is beneficial to ensuring the uniformity of the air flow flowing out from the first air outlet area 31 and the second cavity 22 of the air outlet 30 corresponding to the first cavity 21 to the second air outlet area 32 of the air outlet 30.

[0061] In this embodiment, the third connecting surface 43 is a plane, the third connecting surface 43 is parallel to the plane where the air inlet 10 and the plane where the air outlet 30 are located, and the third connecting surface 43 extends along the first direction. By limiting the third connecting surface 43 to extend along the first direction, the airflow can be stabilized during the process of the airflow entering the second cavity 22 from the first cavity 21, and the phenomenon of vortex in the second cavity 22 after the airflow enters the second cavity 22 from the first cavity 21 can be reduced.

[0062] In this embodiment, the extension length of the third connecting surface 43 along the first direction (the extension direction of the air inlet cavity 20) is in the range of [20 mm, 40 mm]. By limiting the length dimension of the third connecting surface 43, the airflow can be stabilized during the process of the airflow entering the second cavity 22 from the first cavity 21, and the phenomenon of vortex generated in the second cavity 22 after the airflow enters the second cavity 22 from the first cavity 21 can be further reduced.

[0063] Furthermore, the flow limiting structure 40 forms the inner side wall of the air inlet cavity 20 (the first inner wall surface 51 of the tube body 50) and further includes a first arc surface 44 and a second arc surface 45, wherein the first arc surface 44 is connected between the first connecting surface 41 and the third connecting surface 43, and the second arc surface 45 is connected between the second connecting surface 42 and the third connecting surface 43. The first arc surface 44 is rounded, and the radius of the first arc surface 44 is in the range of [10 mm, 20 mm]. The second arc surface 45 is rounded, and the radius of the second arc surface 45 is in the range of [10 mm, 20 mm]. The first curved surface 44 and the second curved surface 45 are provided to prevent the airflow from generating eddies when passing through the flow limiting structure 40, which is beneficial to improving the uniformity of the distribution of the airflow in the first cavity 21 and the second cavity 22, thereby making the airflow flowing out of the area of ​​the air outlet 30 corresponding to the first cavity 21 more uniform, and also making the airflow flowing out of the area of ​​the air outlet 30 corresponding to the second cavity 22 more uniform, thereby making the airflow flowing out of the air outlet 30 to multiple cylinders more uniform, so that each cylinder connected to the air outlet 30 can burn fully, and the vibration and noise generated by the cylinder operation can be reduced.

[0064] It can be understood that in some other embodiments, the inner wall of the air inlet cavity 20 formed by the flow limiting structure 40 (the first inner wall surface 51 of the tube body 50) only includes the first arc surface 44, or the inner wall of the air inlet cavity 20 formed by the flow limiting structure 40 (the first inner wall surface 51 of the tube body 50) only includes the second arc surface 45, and the present application does not impose any restrictions on this.

[0065] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. An intake manifold for air flow, characterized in that: It comprises an air inlet, an air inlet cavity and an air outlet which are connected in sequence, wherein the air inlet is used for the airflow to flow in, and the air outlet is used for the airflow to flow out; a flow limiting structure is arranged in the air inlet cavity, and the flow limiting structure is used for providing flow limiting effect on the airflow in the air inlet cavity.

2. The intake manifold according to claim 1, characterized in that The flow limiting structure divides the air inlet cavity into a first cavity and a second cavity that are connected to each other. The first cavity and the second cavity are arranged sequentially along a first direction, and the air inlet, the first cavity and the second cavity are connected in sequence; the air outlet includes a first air outlet area and a second air outlet area. The first air outlet area and the second air outlet area are arranged sequentially along the first direction, the first air outlet area is connected to the first cavity, and the second air outlet area is connected to the second cavity.

3. The intake manifold according to claim 2, characterized in that: The flow limiting structure includes a first connecting surface and a second connecting surface, the first connecting surface is connected to the inner side wall of the air inlet cavity and is inclined relative to the inner side wall of the air inlet cavity, the second connecting surface is connected to the inner side wall of the air inlet cavity and is inclined relative to the inner side wall of the air inlet cavity, the first connecting surface is set toward the first cavity, and the second connecting surface is set toward the second cavity.

4. The intake manifold according to claim 3, characterized in that The inclination angle between the first connection surface and the inner side wall of the air inlet cavity is θ1, and the inclination angle between the second connection surface and the inner side wall of the air inlet cavity is θ2, θ1>θ2.

5. The intake manifold according to claim 3, characterized in that The range of the inclination angle between the first connecting surface and the inner side wall of the air inlet cavity is [130°, 150°], and the range of the inclination angle between the second connecting surface and the inner side wall of the air inlet cavity is [120°, 140°].

6. The intake manifold according to claim 3, characterized in that The current limiting structure further includes a third connecting surface connected between the first connecting surface and the second connecting surface, and the third connecting surface extends along the first direction.

7. The intake manifold according to claim 6, characterized in that The extension length range of the third connecting surface in the first direction is [20 mm, 40 mm].

8. The intake manifold according to claim 6, characterized in that The current limiting structure further includes a first arc surface and a second arc surface, wherein the first arc surface is connected between the first connecting surface and the third connecting surface, and the second arc surface is connected between the second connecting surface and the third connecting surface.

9. The intake manifold according to claim 8, characterized in that The first arc surface is a rounded corner, and the radius of the first arc surface is in the range of [10 mm, 20 mm]; the second arc surface is a rounded corner, and the radius of the second arc surface is in the range of [10 mm, 20 mm].

10. The intake manifold according to claim 2, characterized in that The intake manifold includes a tube body that surrounds the intake cavity; the tube body includes a first inner wall surface, the flow limiting structure is arranged on the first inner wall surface, the air outlet is arranged relative to the first inner wall surface along a second direction, the second direction is different from the first direction, and the flow limiting structure and the air outlet are on both sides of the first direction.

11. The intake manifold according to claim 10, characterized in that The protruding height range of the flow-limiting structure from the first inner wall surface toward the air outlet is [10 mm, 15 mm].

12. The intake manifold according to claim 10, characterized in that The outer surface of the tube body is provided with reinforcing ribs.

13. The intake manifold according to claim 1, characterized in that The flow limiting structure is integrally formed with the air inlet cavity.

14. An engine, characterized in that: include: An intake manifold as claimed in any one of claims 1 to 13.

15. A vehicle, characterized in that: include: An engine as claimed in claim 14 or an intake manifold as claimed in claims 1 to 13.

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