CN201125804Y - Internal combustion engine exhaust gas recirculation system - Google Patents

Abstract

The utility model provides an exhaust gas recirculation system of an internal combustion engine. The system comprises an exhaust gas outlet channel, an exhaust gas channel, an exhaust gas introduction channel and a throttle valve. The exhaust gas channel is arranged in the cylinder head of the internal combustion engine, and the two ends of the exhaust gas channel are respectively One end of the exhaust gas leading channel communicates with the inlet of the throttle valve, the other end of the exhaust gas leading channel communicates with the exhaust system of the internal combustion engine, and the two ends of the exhaust gas introducing channel communicate with the outlet of the throttle valve and the intake system of the internal combustion engine respectively, Wherein, at least one of the exhaust gas outlet passage and the exhaust gas introduction passage is provided in the cylinder head. Since the exhaust gas passage is arranged in the cylinder head, and at least one of the exhaust gas lead-out passage and the exhaust gas introduction passage is also arranged in the cylinder head, the consumption of pipelines is reduced, the structure of the whole system is simplified, and the exhaust gas recirculation system of the internal combustion engine becomes more compact. It is compact and reduces the cost.

Description

Internal combustion engine exhaust gas recirculation system

technical field

The utility model relates to an exhaust gas recirculation system of an internal combustion engine.

Background technique

The development of environmentally friendly power is one of the important directions of automobile technology. Exhaust gas recirculation (EGR for short) is a common and effective measure to control the emission of nitrogen oxides from internal combustion engines. In order to reduce the nitrogen oxide content in the engine exhaust gas, the traditional method is to connect a very long exhaust pipe downstream of the exhaust manifold, connect the exhaust pipe to the EGR valve, and the exhaust gas enters the intake air through the EGR valve. gas system. Due to the vibration generated during the operation of the engine, it is easy to cause air leakage in the pipeline, so there are certain requirements for the strength and layout of the pipeline design. In addition, due to the high exhaust temperature, if the recirculated exhaust gas directly enters the intake passage, it will cause premature damage to the EGR throttle valve, so it is necessary to load the cooling device from the outside to cool the recirculated exhaust gas. Therefore, the structure of the traditional exhaust gas recirculation system is complex and the cost is high.

In order to overcome the above-mentioned defects, the applicant of the present application submitted a utility model application titled "Exhaust manifold, exhaust manifold gasket, cylinder head and EGR valve seat" on December 30, 2005. The authorized announcement number is CN2903408Y. The content of this application is hereby incorporated by reference in its entirety. This application is a further improvement on the above application.

Utility model content

The purpose of the utility model is to provide a compact internal combustion engine exhaust gas recirculation system.

The utility model provides an exhaust gas recirculation system of an internal combustion engine. The system includes an exhaust gas outlet channel 2, an exhaust gas channel 3, an exhaust gas introduction channel 4 and a throttle valve 9. The exhaust gas channel 3 is arranged in the cylinder head 1 of the internal combustion engine, and The two ends of the waste gas channel 3 communicate with one end of the exhaust gas outlet channel 2 and the inlet of the throttle valve 9 respectively, the other end of the exhaust gas outlet channel 2 communicates with the exhaust system of the internal combustion engine, and the two ends of the exhaust gas introduction channel 4 communicate with the exhaust system respectively. The outlet of the throttle valve 9 communicates with the intake system of the internal combustion engine, wherein at least one of the exhaust gas outlet passage 2 and the exhaust gas introduction passage 4 is arranged in the cylinder head 1 .

Since the exhaust gas recirculation system provided by the utility model sets the exhaust gas channel 3 in the cylinder head 1, and at least one of the exhaust gas outlet channel 2 and the exhaust gas introduction channel 4 is also arranged in the cylinder head 1, thereby reducing the amount of pipelines , Even without adding pipelines, the recirculation of the exhaust gas of the internal combustion engine can be realized, thereby simplifying the structure of the entire system, making the exhaust gas recirculation system of the internal combustion engine compact and reducing the cost. In addition, preferably, the exhaust gas outlet channel 2 and/or the exhaust gas channel 3 are located near the cooling water jacket 5 in the cylinder head 1, so that the cooling of the exhaust gas of the internal combustion engine can be realized without adding additional cooling devices, thereby further simplifying the process. The structure of the system.

Description of drawings

Fig. 1 is a structural schematic diagram of an exhaust gas recirculation system of an internal combustion engine provided by the utility model;

Fig. 2 is a structural schematic diagram of the exhaust gas introduction channel of the internal combustion engine exhaust gas recirculation system provided by the utility model;

Fig. 3 is a structural schematic diagram of an intake pipe transition pad of an exhaust gas recirculation system of an internal combustion engine provided by the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the exhaust gas recirculation system of the internal combustion engine provided by the utility model includes an exhaust gas outlet channel 2, an exhaust gas channel 3, an exhaust gas introduction channel 4 and a throttle valve 9, and the exhaust gas channel 3 is arranged in the cylinder head 1 of the internal combustion engine, And the two ends of the waste gas channel 3 communicate with one end of the exhaust gas outlet channel 2 and the inlet of the throttle valve 9 respectively, the other end of the exhaust gas outlet channel 2 communicates with the exhaust system of the internal combustion engine, and the two ends of the exhaust gas introduction channel 4 are respectively It communicates with the outlet of the throttle valve 9 and the intake system of the internal combustion engine, wherein at least one of the exhaust gas outlet passage 2 and the exhaust gas introduction passage 4 is arranged in the cylinder head 1 .

The exhaust gas outlet passage 2 can be arranged in the cylinder head 1 , the exhaust gas introduction passage 4 can also be arranged in the cylinder head 1 , and both the exhaust gas outlet passage 2 and the exhaust gas introduction passage 4 can be arranged in the cylinder head 1 . In order to further simplify the structure of the system and save pipelines, preferably, the exhaust gas outlet passage 2 and the exhaust gas introduction passage 4 are both arranged in the cylinder head 1 .

When the exhaust gas outlet passage 2 is arranged in the cylinder head 1, the other end of the exhaust gas outlet passage 2 can communicate with an exhaust passage 6 of the exhaust system of the internal combustion engine arranged in the cylinder head 1 . Various methods known in the art can be used to set the exhaust gas outlet passage 2 in the cylinder head 1, such as opening a groove in the cylinder head 1 that communicates with the exhaust passage 6, and then connecting the exhaust pipe gasket 7 and the exhaust pipe through bolts. The air pipe flange 8 is connected to the exhaust side of the cylinder head, and the groove is sealed by the exhaust pipe gasket 7 and the exhaust pipe flange 8, thereby forming the exhaust gas outlet passage 2. The structure and shape of the exhaust gas outlet channel 2 are not particularly limited, as long as its function can be realized.

The waste gas channel 3 can be arranged in various ways known in the art, such as opening a through hole through the intake side and the exhaust side of the cylinder head in the cylinder head 1, so that one end of the through hole communicates with the exhaust gas outlet channel 2, Make the other end of the through hole communicate with the throttle valve 9, and seal the end face of the end of the through hole that communicates with the exhaust gas outlet channel 2 through the exhaust pipe gasket 7 and the exhaust pipe flange 8, thereby preventing the leakage of exhaust gas . The structure and shape of the exhaust gas passage 3 are not particularly limited, as long as its function can be realized.

Since the pipes of the exhaust gas outlet channel 2 and the exhaust gas channel 3 are relatively long, the exhaust gas can be partially cooled while flowing through the exhaust gas outlet channel 2 and the exhaust gas channel 3 . In order to further cool the exhaust gas, preferably, the exhaust gas outlet channel 2 and/or the exhaust gas channel 3 are located near the cooling water jacket 5 in the cylinder head 1 . Since the exhaust gas outlet channel 2 and the exhaust gas channel 3 are both arranged in the cylinder head 1 and communicate with each other, the exhaust gas outlet channel 2 and the exhaust gas channel 3 can be set as one channel. In addition, the exhaust gas outlet channel 2 may include multiple connected channels, and the exhaust gas channel 3 may also include multiple connected channels.

The exhaust gas introduction passage 4 can be provided in the cylinder head 1 in various ways known in the art.

When the exhaust gas introduction channel 4 is arranged in the cylinder head 1, one end of the exhaust gas introduction channel 4 can be communicated with the outlet of the throttle valve 9, and the other end of the exhaust gas introduction channel 4 can be connected with the intake system of the internal combustion engine on the cylinder head 1. The air inlet 10 in the communication. In order to achieve the purpose of communicating the exhaust gas introduction channel 4 with the outlet of the throttle valve 9 and the intake channel 10 of the intake system of the internal combustion engine, the exhaust gas introduction channel 4 can be set as a multi-section channel. Normally, the exhaust gas introduction passage 4 communicates with all intake passages 10 of the intake system of the internal combustion engine. There is no particular limitation on the structure and shape of the exhaust gas introduction channel 4, as long as its function can be realized.

As shown in Figures 2 and 3, in order to allow the exhaust gas to enter the intake passage 10 from the throttle valve 9 more smoothly, preferably, the system further includes an intake pipe transition pad 11, and the exhaust gas introduction passage 4 includes a first passage 4a, the second passage 4b, the third passage 4c and the fourth passage 4d, the third passage 4c is grooved, the first passage 4a communicates with the outlet of the throttle valve 9, and the second passage 4b The two ends of each are connected with the first passage 4a and the third passage 4c respectively, and the exhaust gas diversion groove 12 is arranged on the said intake pipe transition pad 11, said intake pipe transition pad 11 is attached to the wall of the cylinder head 1, and at least A part of the exhaust gas guiding groove 12 is opposite to the third channel 4c and the fourth channel 4d. Various fasteners known in the art can be used to fix the intake pipe transition pad 11 on the cylinder head 1 , such as bolts. In addition, preferably, the intake pipe transition pad 11 is made of cast aluminum material with good thermal conductivity, so that the heat in the exhaust gas can be better dissipated.

Since the engine is usually multi-cylinder, there are usually multiple fourth passages 4d, and the number of the fourth passages 4d is the same as the number of cylinders of the engine. As shown in FIG. 3 , in order to facilitate the communication between the exhaust gas guiding groove 12 and the fourth channel 4d, preferably, the exhaust gas guiding groove 12 has a protrusion 12a, and the protrusion 12a is opposite to the fourth channel 4d. Usually, the number of said protrusions 12a is the same as the number of cylinders of the engine. As shown in FIG. 2 and FIG. 3 , the engine in this embodiment is a four-cylinder engine, so the number of the fourth channel 4d and the protrusions 12a is four correspondingly.

The exhaust gas channel 3 and the exhaust gas introduction channel 4 can communicate with the throttle valve 9 in various ways, such as the throttle valve 9 can be fixed by various fasteners, so that the inlet and outlet of the throttle valve 9 are connected to the exhaust gas channel 3 respectively. The outlet of the exhaust gas inlet and the inlet of the exhaust gas introduction channel 4 fit together, thereby realizing the communication between the exhaust gas channel 3 and the exhaust gas introduction channel 4 and the throttle valve 9 . It is also possible to connect a section of pipe between the inlet and outlet of the throttle valve 9 and the outlet of the exhaust gas channel 3 and the inlet of the exhaust gas introduction channel 4 to realize communication between the exhaust gas channel 3 and the exhaust gas introduction channel 4 and the throttle valve 9 .

The working process of the internal combustion engine exhaust gas recirculation system provided by the utility model is described below.

As shown in Figure 1, Figure 2 and Figure 3, the exhaust gas enters the exhaust gas outlet channel 2 from the exhaust channel 6 of a cylinder of the internal combustion engine, and then enters the exhaust gas channel 3, because the pipelines of the exhaust gas outlet channel 2 and the exhaust gas channel 3 are relatively long, and The exhaust gas channel 3 is set near the cooling water jacket 5 in the cylinder head 1, so that the exhaust gas can be fully cooled during the process of flowing through the exhaust gas outlet channel 2 and the exhaust gas channel 3; the exhaust gas in the exhaust gas channel 3 passes through the throttle valve 9 The inlet enters the throttle valve 9; under the control of the throttle valve 9, part of the exhaust gas enters the first channel 4a of the exhaust gas introduction channel 4 through the outlet of the throttle valve 9, and then the exhaust gas enters the second channel 4b from the first channel 4a, and then Entering the third channel 4c, the exhaust gas enters the exhaust gas guiding groove 12 opposite to it from the third channel 4c, then enters the four fourth channels 4d through the four protrusions 12a of the exhaust gas guiding groove 12, and finally passes through the four fourth channels 4d enters the four intake ports 10 of the internal combustion engine, and then enters the four cylinders for combustion, thereby realizing the recirculation of the exhaust gas of the internal combustion engine.

Since the exhaust gas recirculation system provided by the utility model sets the exhaust gas leading channel 2, the exhaust gas channel 3 and the exhaust gas introducing channel 4 in the cylinder head 1, the consumption of pipelines is greatly reduced, the structure is simplified, and the cost is reduced. In addition, since the circulating exhaust gas can be cooled by the cooling water jacket 5 in the cylinder head 1, there is no need to add additional cooling devices, which further simplifies the structure of the system and reduces the cost.

Claims (9)

1, a kind of engine exhaust gas recirculating system, this system comprises waste gas extraction channel (2), exhaust steam passage (3), waste gas is introduced passage (4) and throttle valve (9), described exhaust steam passage (3) is arranged in the cylinder head (1) of internal-combustion engine, and the two ends of exhaust steam passage (3) communicate with an end of waste gas extraction channel (2) and the inlet of throttle valve (9) respectively, the other end of described waste gas extraction channel (2) communicates with internal combustion engine exhaust system, the two ends that described waste gas is introduced passage (4) communicate with the outlet and the induction system of internal combustion engine of throttle valve (9) respectively, it is characterized in that at least one in described waste gas extraction channel (2) and the waste gas introducing passage (4) is arranged in the cylinder head (1).

2, system according to claim 1 is characterized in that, described waste gas extraction channel (2) and waste gas are introduced passage (4) and all is arranged in the cylinder head (1).

3, system according to claim 1 and 2 is characterized in that, the other end of described waste gas extraction channel (2) communicates with an air outlet flue (6) that is arranged in the cylinder head (1) of internal combustion engine exhaust system.

4, system according to claim 1 and 2 is characterized in that, described waste gas extraction channel (2) and/or exhaust steam passage (3) be positioned at cylinder head (1) cooling jacket (5) near.

5, system according to claim 1 and 2 is characterized in that, the two ends that described waste gas is introduced passage (4) communicate with the outlet of throttle valve (9) and the intake duct (10) that is arranged in the cylinder head (1) of induction system of internal combustion engine respectively.

6, system according to claim 1 and 2, it is characterized in that, this system also comprises suction tude transition pad (11), described waste gas is introduced passage (4) and is comprised first passage (4a), second channel (4b), third channel (4c) and four-way (4d), described third channel (4c) is the groove shape, described first passage (4a) communicates with the outlet of throttle valve (9), the two ends of described second channel (4b) communicate with first passage (4a) and third channel (4c) respectively, described suction tude transition pad (11) is provided with waste gas guiding gutter (12), the wall setting of described suction tude transition pad (11) applying cylinder head (1), and at least a portion waste gas guiding gutter (12) is relative with four-way (4d) with third channel (4c).

7, system according to claim 6 is characterized in that, the number of described four-way (4d) is identical with the cylinder number of motor.

8, system according to claim 6 is characterized in that, described waste gas guiding gutter (12) has outstanding (12a), and described outstanding (12a) is relative with four-way (4d).

9, system according to claim 8 is characterized in that, the number of described outstanding (12a) is identical with the cylinder number of motor.

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