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engine egr connection pipe

A technology for connecting pipelines and engines, applied in engine components, combustion engines, machines/engines, etc., can solve problems such as affecting engine power and obstructing intake air, and achieve the effect of improving performance, avoiding obstruction, and avoiding obstruction

Active Publication Date: 2016-03-02
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with this structure, since the EGR pipe extends into the intake manifold to complete the mixing of exhaust gas and fresh air, at the operating point where EGR is not required, the extended EGR pipe will hinder the intake air and affect the power of the engine.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Depend on figure 1 combine figure 2 As shown, the engine EGR connection pipeline involved in this embodiment includes an intake manifold 1 connected to the engine intake port, and an EGR that is arranged outside the intake manifold 1 and is fixedly connected with the intake manifold 1 through a flange 3 Pipe 2, EGR pipe 2 provides a connection channel for the exhaust gas to flow into the intake manifold 1. Correspondingly, a through hole 4 is provided at the junction of the intake manifold 1 and the EGR pipe 2, and the EGR pipe 2 does not extend into the intake manifold 1 from the through hole 4, but is only fixed in the through hole 4 At the outer wall of the intake manifold 1.

[0022] A moving tube 5 is slidably arranged in the EGR tube 2, and the outer diameter of the moving tube 5 is not larger than the aperture of the through hole 4. This arrangement makes the moving tube 5 slide into the EGR tube through the through hole 4 into the Inside the gas main pipe 1....

Embodiment 2

[0028] The engine EGR connection pipeline involved in this embodiment is basically the same as that of Embodiment 1, except that the air port setting on the moving tube 5, in order to clearly see the setting of the air port, image 3 Open the closed left end of the moving tube, and the gas ports include the first gas port 61 arranged at the top of the moving tube, and two second gas ports 62 arranged at the lower part of the radial side of the moving tube 5, the first gas port 61 and two second air ports 62 are arranged at the isocentric angle of the axial direction of the moving tube 5 . In addition, in order to enhance the mixing effect of the exhaust gas and the intake air in the intake pipe, the sum of the areas of the two second air ports 62 can be set to be smaller than the area of ​​the first air port 61 .

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PUM

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Abstract

The invention relate to a pipeline connection structure applied to a vehicle engine exhaust gas recirculation (EGR) system, in particular to an engine EGR connection pipeline which comprises an air inlet main pipe, an EGR pipe fixedly connected with the air inlet main pipe and a return device. A movable pipe entering the air inlet main pipe pushed by air pressure in the EGR pipe is arranged in the EGR pipe slidably, an air port capable of allowing the air inlet main pipe to be communicated with the EGR pipe when the movable pipe enters into the air inlet main pipe is formed in the movable pipe, and the return device acts on the movable pipe and drives the movable pipe to be retracted into the EGR pipe when the air pressure in the EGR pipe disappears. By means of the technical scheme, the EGR pipe is prevented from blocking air flows in the air inlet main pipe when the EGR does not work, and the performance of an engine is improved.

Description

technical field [0001] The invention relates to a pipeline connection structure applied in a vehicle engine EGR system, in particular to an engine EGR connection pipeline. Background technique [0002] The working principle of exhaust gas recirculation (EGR) is to introduce part of the exhaust gas into the cylinder, because the exhaust gas contains H 2 O.CO 2 , to increase the heat capacity of the mixture, thereby reducing the maximum combustion temperature and reducing the NOx emission concentration. Generally, the EGR system can realize circulation through internal EGR and external EGR. Internal EGR is different from external EGR, and its essence is realized by enlarging the valve overlap angle. External EGR is commonly referred to as EGR, that is, part of the exhaust gas in the exhaust manifold is introduced into the intake manifold through an external pipeline, so that the exhaust gas participates in reburning, thereby realizing the EGR cycle. At present, in internal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M26/20F02M26/21F02M26/70F02M26/12
CPCY02T10/12
Inventor 伊士旺彭成刘亚奇赵铮张德胜
Owner GREAT WALL MOTOR CO LTD