Engine air inlet system

Abstract

The utility model discloses an engine air inlet system which comprises an air inlet manifold located between a throttle valve and an air inlet valve and further comprises an EGR system communicated with the air inlet manifold. The gas outlet end of the EGR system is provided with the spoiler, the spoiler is provided with the spoiler part for preventing gas entering the gas inlet manifold from the gas outlet end of the EGR system from being agglomerated, gas agglomeration introduced by EGR can be reduced, EGR waste gas is evenly mixed and sent to an engine, and the performance of the engine is improved.

Description

Technical Field

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

[0002] EGR refers to the technology of separating part of the exhaust gas after combustion in an internal combustion engine and introducing it into the intake side for re-combustion. The main purpose is to reduce nitrogen oxides (NOx) in the exhaust gas and improve fuel consumption rate when sharing part of the load. In the existing engine EGR system, the exhaust gas passes through the EGR cooler and EGR valve and directly enters the intake manifold components. The gas flow rate of the naturally aspirated engine is slow, and the exhaust gas cannot be mixed evenly, resulting in poor EGR uniformity in each cylinder. The gas introduced by EGR is introduced into each cylinder in the form of agglomeration, resulting in inconsistent combustion in each cylinder and poor engine performance.

[0003] Therefore, in order to solve the above problems, an engine intake system is needed that can reduce the agglomeration of gas introduced by EGR, mix the EGR exhaust gas and send it to the engine to improve engine performance. Utility Model Content

[0004] In view of this, the purpose of the utility model is to overcome the defects in the prior art, provide an engine intake system, reduce the gas agglomeration introduced by EGR, mix the EGR exhaust gas and send it to the engine, thereby improving the engine performance.

[0005] The engine air intake system of the utility model comprises an intake manifold located between a throttle valve and an intake valve, and also comprises an EGR system communicated with the intake manifold;

[0006] The outlet end of the EGR system is provided with a spoiler, and the spoiler has a spoiler portion for preventing the gas from entering the intake manifold from the outlet end of the EGR system from agglomerating.

[0007] Furthermore, the outlet end of the EGR system is connected to the intake manifold near the throttle valve.

[0008] Furthermore, the spoiler blocks the gas outlet end of the EGR system, and the spoiler portion is a through hole opened on the spoiler, so that the gas passing through the EGR system is delivered to the intake manifold through the through hole.

[0009] Furthermore, the through hole includes hole I and hole II which are opened on the spoiler and have different aperture sizes.

[0010] Furthermore, an obstacle is provided in the intake manifold, and the obstacle is located at the rear side of the air outlet direction of the through hole.

[0011] Furthermore, the air intake direction of the intake manifold through the throttle valve is perpendicular to the air intake direction through the intake valve; the air intake direction of the EGR system is substantially perpendicular to both the air intake direction of the intake manifold through the throttle valve and the air intake direction through the intake valve.

[0012] Furthermore, the intake manifold has a functional seat for assembling a throttle valve and an outlet end of an EGR system, the functional seat has an intake passage opened parallel to the intake direction of the throttle valve, and the throttle valve is installed at the head end of the intake passage;

[0013] The outlet end of the EGR system is connected to the intake channel through a spoiler, the obstacle is the circumferential inner wall of the intake channel, and the through hole is opened toward the circumferential inner wall of the intake channel.

[0014] Furthermore, the spoiler is a distribution pipe connected to the gas outlet of the EGR system, the head end of the distribution pipe is connected to the gas outlet of the EGR system, the end of the distribution pipe is closed, and the through hole is opened in the distribution pipe.

[0015] Furthermore, the distribution pipe is cylindrical, and the central axis of the distribution pipe is substantially parallel to the gas outlet direction of the EGR system;

[0016] The bottom of the dispensing pipe is closed by a bottom cover, and the bottom cover is hemispherical and protrudes downward.

[0017] Furthermore, the bottom cover and the distribution pipe are manufactured in one piece, and the through hole comprises a functional hole opened in the radial center of the bottom cover.

[0018] The beneficial effects of the utility model are as follows: the engine intake system disclosed by the utility model can prevent the agglomeration of exhaust gas from the EGR system through the arrangement of the spoiler, and can make the exhaust gas mixed with the throttle intake air in the intake manifold and sent to the engine evenly, and can make the combustion of each cylinder in a naturally aspirated engine consistent, thereby improving the engine performance; the use of the spoiler can also reduce the flow rate of the exhaust gas of the EGR system, and can make the air guide channel of the EGR system as short as possible, which can be more convenient in structural layout, and provide favorable conditions for the assembly of accessories around the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0022] Figure 3 For this utility model Figure 2 AA structural diagram;

[0023] Figure 4 It is a schematic diagram of the top view structure of the utility model;

[0024] Figure 5 For this utility model Figure 4 BB structural diagram;

[0025] Figure 6 For this utility model Figure 4 Schematic diagram of CC structure;

[0026] Figure 7 It is a side view structural schematic diagram of the utility model;

[0027] Figure 8 It is a schematic diagram of the back structure of the utility model;

[0028] Fig. 9 It is a schematic diagram of the structure of the spoiler of the utility model;

[0029] Fig.10 For this utility model Fig. 9 Schematic diagram of the top view structure. DETAILED DESCRIPTION

[0030] Figure 1 The schematic diagram of the structure of the utility model is shown in the figure. The engine intake system in the present embodiment includes an intake manifold 001 located between the throttle valve and the intake valve, and also includes an EGR system connected to the intake manifold 001; the outlet end of the EGR system is provided with a spoiler 1, and the spoiler 1 has a spoiler portion that prevents the gas from entering the intake manifold 001 from the outlet end of the EGR system. The arrangement of the spoiler 1 can prevent the agglomeration of the exhaust gas of the EGR system, and can make the exhaust gas in the intake manifold 001 mixed with the throttle valve intake air and sent to the engine evenly, and can make the combustion of each cylinder consistent in the naturally aspirated engine, so as to improve the engine performance; wherein the spoiler 1 can be a mesh structure or a support arm structure or a protruding blocking part, etc., so as to destroy the function of gas agglomeration, which will not be repeated here; the use of the spoiler 1 can also reduce the flow rate of the exhaust gas of the EGR system, and can make the air guide channel of the EGR system as short as possible, which can be more convenient in the structural layout, and provide favorable conditions for the assembly of the accessories around the engine.

[0031] In this embodiment, the outlet end of the EGR system is connected to the intake manifold 001 close to the throttle valve, which is beneficial to improving the gas mixing effect. More specifically, the outlet end of the EGR system is located on the rear side of the throttle valve, and the two are close to each other. The rear side is the rear side of the throttle valve in the intake direction. The front side contacts the intake gas first, and the reverse side contacts the intake gas. After the throttle valve intakes air, it is directly mixed with the EGR exhaust gas in the destroyed agglomerated state, and then sent to the engine through the intake manifold 001 and the intake valve.

[0032] In this embodiment, the spoiler 1 blocks the outlet end of the EGR system, and the spoiler is a through hole opened on the spoiler 1, so that the gas passing through the EGR system is sent to the intake manifold 001 through the through hole. The arrangement of the through holes limits the size range of gas agglomeration, and the spoiler 1 blocks the outlet end of the EGR system, so that the gas discharged by EGR can only be sent to the intake manifold 001 through the through hole, thereby improving the effectiveness of gas mixing; or the spoiler 1 forms a separation or obstruction on the outlet end of the EGR system, so that the gas agglomeration state is destroyed, which is suitable and will not be repeated here.

[0033] In this embodiment, the through holes include holes Ⅰ11 and holes Ⅱ12 with different aperture sizes, which are opened on the spoiler 1. In this scheme, there are several holes Ⅰ11 and several holes Ⅱ12, and the several holes Ⅰ11 and the several holes Ⅱ12 are arranged irregularly. The layout of this structure can directly reduce the gas flow rate of the EGR gas introduced into the intake manifold 001, control the flux of the gas escaping from the spoiler 1, and improve the gas escape effect; of course, the through holes can also include holes of inconsistent sizes such as holes Ⅲ, holes Ⅳ and holes Ⅴ, and the above-mentioned holes with inconsistent aperture sizes are distributed on the spoiler 1 to reduce the possibility of gas agglomeration in the intake manifold 001, and make the gas introduced by the EGR system enter the intake manifold 001 in an escaping manner.

[0034] In this embodiment, an obstacle is provided in the intake manifold 001, and the obstacle is located on the rear side of the gas outlet direction of the through hole, that is, the gas discharged from the through hole moves toward the obstacle. The purpose of arranging the obstacle is to provide secondary protection for turbulence and destruction of gas agglomeration, to prevent the airflow speed from being too fast and the spoiler 1 from being insufficient to slow down the airflow and guide the airflow, thereby providing secondary blocking for the gas discharged through the through hole and breaking up the agglomerated gas agglomerates, reducing the gas flow rate and destroying the agglomerated gas in the airflow, further allowing the gas introduced by the EGR system to enter the intake manifold 001 in a dissipated manner.

[0035] In this embodiment, the air intake direction of the intake manifold 001 through the throttle valve is perpendicular to the air intake direction through the intake valve, so that the gas is guided to a preset environment. The air intake direction of the EGR system is roughly perpendicular to the air intake direction of the intake manifold 001 through the throttle valve and the air intake direction through the intake valve. The roughly perpendicular meaning is that a small angle adjustment can be made on the basis of the verticality to adapt to the use environment, which will not be repeated here. This layout method in which the airflow directions are perpendicular to each other makes it so that any airflow direction does not coordinate with other airflow directions, prevents the mixing of the flow directions of two or more airflows, reduces the agglomeration of the gas introduced by the EGR in the intake manifold 001, improves the mixing of the gas in the intake manifold 001, and improves the engine performance.

[0036] In this embodiment, the intake manifold 001 has a functional seat 2 for assembling a throttle valve and an outlet end of an EGR system, and the functional seat 2 has an intake passage 21 opened parallel to the intake direction of the throttle valve, and the throttle valve is installed at the head end of the intake passage 21; as shown in the figure, in this scheme, one end of the intake manifold 001 in the length direction protrudes outward to form a functional seat 2 for assembling a throttle valve and an outlet end of an EGR system, and the throttle valve is installed at one end in the length direction of the functional seat 2, and the outlet end of the EGR system is installed on the intake manifold 001 from top to bottom at an angle approximately perpendicular to the length direction of the functional seat 2, so that the outlet end of the EGR system is close to the throttle valve;

[0037] The outlet end of the EGR system is connected to the intake channel 21 through the spoiler 1, the obstacle is the circumferential inner wall of the intake channel 21, and the through hole is opened toward the circumferential inner wall of the intake channel 21; that is, the spoiler 1 is built into the intake channel 21, and the circumferential inner wall of the intake channel 21 forms an obstacle, and the through hole is opened toward the circumferential inner wall of the intake channel 21, which not only breaks up the EGR exhaust gas passing through the spoiler 1, but also breaks up the gas entering through the throttle valve, thereby improving the mixing degree of the gas in the intake manifold 001 and improving the engine performance.

[0038] In this embodiment, the spoiler 1 is a distribution pipe connected to the outlet end of the EGR system, the head end of the distribution pipe is connected to the outlet end of the EGR system, the end of the distribution pipe is closed, and the through hole is opened in the distribution pipe. More specifically, the distribution pipe is cylindrical, which improves the effectiveness of guiding the EGR exhaust gas and the effectiveness of breaking the exhaust gas agglomeration, forcing the EGR exhaust gas to escape in the intake manifold 001 through the distribution pipe, and the central axis of the distribution pipe is roughly parallel to the outlet direction of the EGR system; the bottom of the distribution pipe is closed by a bottom cover, and the bottom cover and the distribution pipe are integrally formed to improve the reliability of the structure; the bottom cover is hemispherical and protrudes downward, and the through hole includes a functional hole 13 opened in the radial center of the bottom cover. The setting of the functional hole 13 has the same purpose as the through hole. At the same time, since the central axis of the distribution pipe in this scheme is parallel to the outlet direction of the EGR system, it also plays a role in slowing down the high-speed airflow, restricting the caliber of the airflow beam rushing out of the functional hole 13, and is suitable for the EGR system with segmented exhaust.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An engine air intake system, characterized in that: including an intake manifold between a throttle valve and an intake valve, and an EGR system in communication with the intake manifold; The outlet end of the EGR system is provided with a spoiler, and the spoiler has a spoiler portion for preventing the gas from entering the intake manifold from the outlet end of the EGR system from agglomerating.

2. The engine air intake system according to claim 1, characterized in that: The outlet end of the EGR system is connected to the intake manifold near the throttle valve.

3. The engine air intake system according to claim 1, characterized in that: The spoiler blocks the gas outlet end of the EGR system, and the spoiler portion is a through hole opened on the spoiler, so that the gas passing through the EGR system is sent to the intake manifold through the through hole.

4. The engine air intake system according to claim 3, characterized in that: The through holes include hole I and hole II which are opened on the spoiler and have different hole diameters.

5. The engine air intake system according to claim 3, characterized in that: An obstacle is arranged in the intake manifold, and the obstacle is located at the rear side of the air outlet direction of the through hole.

6. The engine air intake system according to claim 5, characterized in that: The air intake direction of the intake manifold through the throttle valve is perpendicular to the air intake direction through the intake valve; the air intake direction of the EGR system is substantially perpendicular to both the air intake direction of the intake manifold through the throttle valve and the air intake direction through the intake valve.

7. The engine air intake system according to claim 6, characterized in that: The intake manifold has a functional seat for assembling a throttle valve and an outlet end of an EGR system, and the functional seat has an intake passage opened parallel to the intake direction of the throttle valve, and the throttle valve is installed at the head end of the intake passage; The outlet end of the EGR system is connected to the intake channel through a spoiler, the obstacle is the circumferential inner wall of the intake channel, and the through hole is opened toward the circumferential inner wall of the intake channel.

8. The engine air intake system according to claim 3, characterized in that: The spoiler is a distribution pipe connected to the gas outlet of the EGR system, the head end of the distribution pipe is connected to the gas outlet of the EGR system, the end of the distribution pipe is closed, and the through hole is opened in the distribution pipe.

9. The engine air intake system according to claim 8, characterized in that: The distribution pipe is cylindrical, and the central axis of the distribution pipe is substantially parallel to the gas outlet direction of the EGR system; The bottom of the dispensing pipe is closed by a bottom cover, and the bottom cover is hemispherical and protrudes downward.

10. The engine air intake system according to claim 9, characterized in that: The bottom cover and the distribution pipe are manufactured by integral molding, and the through hole comprises a functional hole opened in the radial center of the bottom cover.

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