CN207945026U - EGR intake elbow and EGR intake system - Google Patents

Abstract

The utility model is related to EGR intake elbows and EGR gas handling systems, it is integrated with EGR mixer on the intake elbow, one end of the intake elbow is air inlet end, the other end of the intake elbow is gaseous mixture outlet side, the bend loss of the intake elbow is equipped with EGR exhaust air inlet, the bend loss is internally provided with exhaust steam passage and is connected to multiple EGR exhaust gas outlets, EGR exhaust can be discharged via the multiple EGR exhaust gas outlet is being mixed to form mixed gas with fresh air at the bend loss, the mixed gas is expelled to inlet manifold by the gaseous mixture outlet side and enters cylinder.The utility model additionally provides a kind of EGR gas handling systems including above-mentioned intake elbow.The utility model on intake elbow by integrating EGR mixer, it in such a way that EGR exhaust circumferential direction air inlet is mixed into fresh air, had not only solved EGR mixing uniformity requirements, but also has met the structure design compactedness requirement of light duty engine, engine performance is improved, NO is effectively reduced_xDischarge.

Description

EGR intake elbow and EGR intake system

technical field

The utility model relates to the technical field of heavy-duty vehicle accessories, in particular to an EGR intake elbow and an EGR intake system.

Background technique

EGR refers to exhaust gas recirculation, which is a technology that separates part of the exhaust gas after combustion and introduces it into the intake side to make it participate in combustion again. With the upgrading of emissions and the reduction of _NOx emissions from diesel engines, the necessity of adding EGR system is getting higher and higher.

In order to meet the EGR engine's requirements for mixing uniformity of exhaust gas and fresh air, the traditional design method relies on lengthening the EGR mixing section and prolonging the EGR mixing time to achieve EGR mixing uniformity requirements, or adding a porous mixing structure or exhaust gas distribution pipe at the end of the EGR exhaust pipe. , to further enhance the mixing effect.

The above-mentioned design idea of achieving EGR mixing uniformity by lengthening the EGR mixing section and prolonging the EGR mixing time can meet the requirements of the EGR engine for the mixing uniformity of exhaust gas and fresh air, but the design idea has too strict requirements for space layout. Longer EGR exhaust pipes and intake elbows are often required to meet the requirements of the mixing length, resulting in too long pipes on the intake side of the engine and difficult space layout, which is difficult for light-duty engines and models with tight vehicle space. larger. At the same time, due to the defects of the above-mentioned self-structure, the airflow collision is serious, resulting in relatively large EGR exhaust gas intake resistance, which is not conducive to the generation of EGR driving pressure difference and affects the realization of EGR rate.

Utility model content

The purpose of this utility model is to at least solve one of the above defects and deficiencies, and this purpose is achieved through the following technical solutions.

The utility model provides an intake elbow for an EGR air intake system, an EGR mixer is integrated on the intake elbow, one end of the intake elbow is an air intake end, and the intake The other end of the elbow is the mixed gas outlet end. The elbow section of the intake elbow is provided with an EGR exhaust gas inlet. Exhaust gas can pass through the exhaust gas passage and be discharged through the plurality of EGR exhaust gas outlets, mix with fresh air near the elbow section to form a mixed gas, and the mixed gas is discharged to the intake manifold through the mixed gas outlet port The tube goes into the engine cylinder.

Preferably, the waste gas channel is arranged circumferentially along the inner wall of the elbow section.

Preferably, the plurality of EGR exhaust gas outlets are arranged radially along the exhaust gas passage, and the EGR exhaust gas is discharged in different directions through the plurality of EGR exhaust gas outlets and mixed with the fresh air.

Preferably, the air intake end is provided with a flow valve, and the mixture gas outlet end is provided with an EGR valve.

Preferably, the intake elbow is a round pipe or a square pipe.

Preferably, at least three EGR exhaust gas outlets are provided.

The utility model also provides an EGR intake system, which includes an intake elbow, a heater and an intake manifold, the intake elbow is the above-mentioned intake elbow, and the mixed gas discharge end is connected to the intake manifold. The gas manifold is connected, and the heater is arranged at the connection between the intake elbow and the intake manifold.

The utility model has the following advantages:

(1) In the utility model, the EGR exhaust gas is mixed into the fresh air in different directions along the circumference by means of the integrated channel on the intake elbow, and the balance between the exhaust gas and the fresh air is realized by adjusting the position of each mixing point and the flow area of each mixing point. Mix evenly to ensure the uniformity of each cylinder.

(2) The EGR mixer of the utility model can realize multi-point air intake, reduce airflow collision, reduce EGR exhaust gas intake resistance, add EGR exhaust gas inlet in the low-pressure area, increase exhaust gas introduction, and improve EGR rate.

(2) The intake elbow of the utility model integrates the EGR mixer itself, which not only meets the requirements for EGR mixing uniformity, but also realizes the design goal of compact structure of the light-duty diesel engine.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating preferred embodiments, and are not considered to limit the present invention. Also throughout the drawings, the same reference numerals are used to designate the same components.

Fig. 1 is the sectional view of the intake elbow used for the EGR intake system provided by the utility model embodiment;

Fig. 2 is the top sectional view of the intake elbow for the EGR intake system provided by the embodiment of the present invention;

Fig. 3 is the layout drawing of the intake elbow used for the EGR intake system provided by the embodiment of the present invention;

The reference signs in the figure are as follows:

10-Intake elbow 11-Air intake end

12-Mixture exhaust port 13-EGR exhaust gas inlet

14-Bend pipe 15-Exhaust gas channel

16-EGR exhaust gas outlet 20-heater

30 - intake manifold

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

1 to 2 show schematic diagrams of an intake elbow used in an EGR intake system provided according to an embodiment of the present invention. As shown in Figure 1 and Figure 2, the EGR intake elbow provided by the utility model integrates an EGR mixer near the elbow section, and the EGR intake elbow 10 includes an air intake end 11 and a mixture exhaust end 12 And the EGR exhaust gas intake port 13, the air intake port 11 is used to communicate with external fresh air, the mixed gas exhaust port 12 is connected with the intake manifold 30 of the engine, the EGR exhaust gas intake port 13 is connected with the exhaust pipe of the engine, fresh The air and the exhaust gas discharged from the engine exhaust pipe can be mixed in the intake elbow 10 and then discharged to the intake manifold 30 through the mixed gas outlet port 12 to enter the engine cylinder.

The EGR exhaust gas inlet 13 is arranged on the elbow section 14 of the intake elbow 10, and the inside of the elbow section 14 is provided with an exhaust gas channel 15, which is arranged circumferentially along the inner wall of the elbow section 14, and the exhaust gas channel 15 There are a plurality of EGR exhaust gas outlets 16 along its radial direction, and the EGR exhaust gas can pass through the exhaust gas channel 15 and be discharged in different directions through the plurality of EGR exhaust gas outlets 16. It is formed by mixing with fresh air at multiple points near the elbow section 14. mixed composition.

The flow cross-sectional area of the EGR exhaust gas at each mixing point is different. The farther the EGR exhaust gas outlet 16 from the EGR exhaust gas inlet 13 is, the larger the flow cross-sectional area is, and the closer the EGR exhaust gas is to the EGR exhaust gas inlet 13. smaller.

There are at least three EGR exhaust gas outlets 16. The exhaust gas is mixed into the fresh air in multiple different directions in the circumferential direction by means of the exhaust gas channel 15 integrated in the elbow section 14. Through the adjustment of the position of each mixing point and the flow area of each mixing point, It can realize the uniform mixing of exhaust gas and fresh air, and meet the requirements of EGR rate uniformity of each cylinder.

By mixing the EGR exhaust gas with fresh air at multiple points, the impact of the exhaust gas and the fresh air can be reduced, the intake resistance of the EGR exhaust gas can be reduced, and the EGR driving pressure difference loss can be reduced. In addition, according to the analysis of fluid mechanics, when the airflow flows through the elbow due to inertia, a low-pressure area will be generated inside the elbow. With this feature, an EGR exhaust gas inlet 13 is added inside the elbow, which has a good effect on the introduction of exhaust gas. "pump gas" action, which helps to achieve a higher EGR rate. The intake elbow 10 does not need to be set longer, nor does it need to increase the guide tube, and the structure is compact and convenient to arrange.

As shown in FIG. 2 , in this embodiment, an angle is formed at the inlet elbow 10 close to the air inlet end 11 to facilitate matching with corresponding components. In other embodiments, the pipe body of the air intake end 11 can be all straight pipes or curved pipes, which are set according to specific situations, and the present invention does not specifically limit them.

The intake elbow 10 can be a round pipe or a square pipe, and the utility model is not limited thereto.

In a specific implementation, a flow valve (not shown) may be provided at the air intake end 11 of the intake elbow 10 . The flow valve can detect the flow of fresh air entering the intake elbow 10, and is electrically connected with the engine controller ECU, so as to control the intake of fresh air according to actual working conditions.

In addition, an EGR valve (not shown) may also be provided at the EGR exhaust gas inlet 13, the EGR valve is electrically connected to the engine controller ECU, and the intake of exhaust gas can be controlled by controlling the opening of the EGR valve.

In addition, a temperature sensor and/or a pressure sensor (not shown) may be set at the air intake end 11 to monitor the temperature and/or pressure of the fresh air; a temperature sensor and/or a pressure sensor may be set at the air mixture exhaust end 12 (not shown) to monitor the temperature and/or pressure of the gas mixture.

The EGR intake elbow is also applicable to the mixing of any other two gases that require mixing uniformity, and the present invention will not repeat them.

As shown in FIG. 3 , the utility model also provides an intake system including the EGR intake elbow, including an intake elbow 10 , a heater 20 and an intake manifold 30 . The gas mixture exhaust port 12 is connected to the intake manifold 30 , and the heater 20 is arranged at the joint between the intake elbow 10 and the intake manifold 30 . On the premise of satisfying the uniformity of EGR mixing, the air intake system has a simple structure and a simple appearance, does not need to occupy additional layout space, and satisfies the characteristics of compact space layout of light-duty engines.

The utility model integrates the EGR mixer on the intake elbow and adopts the way that the EGR exhaust gas is mixed into the fresh air in the circumferential direction, which not only solves the requirement of EGR mixing uniformity, but also meets the compactness requirement of the structure design of the light engine. The air intake reduces airflow collision, and realizes pumping according to the low pressure distribution inside the elbow, which minimizes exhaust gas intake resistance, improves the uniformity of EGR rate distribution in each cylinder of the engine, improves engine performance, and effectively reduces nitrogen oxides pollutant (NO _x ) emissions.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (7)

1. An intake elbow for an EGR intake system, characterized in that an EGR mixer is integrated on the intake elbow, one end of the intake elbow is an air intake end, and the inlet The other end of the air elbow is the mixed gas outlet end, the elbow section of the intake elbow is provided with an EGR exhaust gas inlet, and the inside of the elbow section is provided with an exhaust gas channel and communicated with a plurality of EGR exhaust gas outlets, The EGR exhaust gas can pass through the exhaust gas channel and be discharged through the plurality of EGR exhaust gas outlets, mix with fresh air near the elbow section to form a mixed gas, and the mixed gas is discharged to the intake air through the mixed gas outlet port The manifold goes into the engine cylinders. 2 . The intake elbow for an EGR intake system according to claim 1 , wherein the exhaust gas passage is arranged circumferentially along the inner wall of the elbow section. 3 . 3. The intake elbow for an EGR intake system according to claim 2, wherein the plurality of EGR exhaust gas outlets are arranged radially along the exhaust gas passage, and the EGR exhaust gas passes through the plurality of EGR exhaust gas outlets. Exhaust air exits in different directions and mixes with the fresh air. 4 . The intake elbow for an EGR intake system according to claim 1 , wherein a flow valve is provided at the air intake end, and an EGR valve is provided at the mixed gas outlet end. 5. The intake elbow for an EGR intake system according to any one of claims 1 to 4, characterized in that the intake elbow is a round pipe or a square pipe. 6. The intake elbow for an EGR intake system according to any one of claims 1 to 4, characterized in that at least three said EGR exhaust gas outlets are provided. 7. An EGR air intake system, comprising an intake elbow, a heater and an intake manifold, characterized in that, the intake elbow is according to any one of claims 1 to 6 for The intake elbow of the EGR intake system, the mixed gas discharge end is connected to the intake manifold, and the heater is arranged at the connection between the intake elbow and the intake manifold.