Device for mixing a stream of inlet gases and of recirculated exhaust gases comprising insulating means for the recirculated exhaust gases

Patent metadata

Field	Value
Publication number	US-9822735-B2
Application number	US-201113825867-A
Country	US
Kind code	B2
Filing date	Jul 28, 2011
Priority date	Sep 27, 2010
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

The invention relates to a device for mixing a stream of supercharging air and a stream of recirculated exhaust gases. The device comprises a manifold allowing the stream of air and the stream of recirculated gases to be mixed, and allowing the mixture to be distributed in the cylinder head. The device also comprises means for conveying the recirculated exhaust gases in the manifold that allow the distributed injection of the recirculated exhaust gases into the stream of supercharging air. The device additionally comprises means for thermally insulating the conveying means in order to limit the cooling of the recirculated exhaust gases by the supercharging air.

First claim

The invention claimed is:

1. A device for mixing a stream of supercharging air and a stream of recirculated exhaust gases with a view to admitting them into a cylinder head of a motor vehicle combustion engine, said device comprising:
a distribution manifold allowing the stream of supercharging air and the stream of recirculated exhaust gases to be mixed, and allowing the mixture to be distributed in the cylinder head, said distribution manifold having a pair of opposing walls between which the stream of supercharging air circulates and including a casing in one piece with a first wall of said pair of opposing walls, said casing extending transversely to the stream of the supercharging air;
means for conveying recirculated exhaust gases in said distribution manifold that allow the distributed injection of the recirculated exhaust gases into the stream of supercharging air,
wherein said device additionally comprises means for thermally insulating said means for conveying in order to limit the cooling of the recirculated exhaust gases by the supercharging air; and wherein said means for thermally insulating comprises a supercharging air deflector for diverting the stream of supercharging air so that it bypasses said means for conveying, and said means for conveying is arranged in said casing of which at least a portion forms said supercharging air deflector, wherein said supercharging air deflector extends over an entire width of said distribution manifold and wherein said supercharging air deflector has an ‘L’ shaped cross-section which extends along an entire length of said supercharging air deflector in the direction of its longitudinal axis along said means for conveying.

2. The device as claimed in claim 1 , wherein said means for conveying has a thermal conductivity of less than or equal to 50 W·m −1 ·K −1 .

3. The device as claimed in claim 2 , wherein said means for conveying has a thermal conductivity of less than or equal to 30 W·m −1 ·K −1 .

4. The device as claimed in claim 1 , wherein said supercharging air deflector is placed upstream of said means for conveying in the direction of circulation of the supercharging air.

5. The device as claimed in claim 4 , wherein said deflector is in one piece with said distribution manifold.

6. The device as claimed in claim 4 , wherein said means for conveying is arranged in said casing of which the upstream face in the direction of circulation of the supercharging air forms said supercharging air deflector.

7. The device as claimed in claim 1 , wherein said means for conveying comprises a tube inside which the recirculated exhaust gases circulate and which extends transversely to the direction of circulation of the supercharging air.

8. The device as claimed in claim 7 , wherein said tube and said distribution manifold comprise reciprocal mechanical fastening means.

9. The device as claimed in claim 7 , said distribution manifold is overmolded on said tube.

10. The device as claimed in claim 7 , wherein said tube comprises a series of holes distributed over its length.

11. The device as claim 1 , wherein said means for conveying comprises a tube inside which the recirculated exhaust gases circulate, said tube comprising a single wall made of steel.

12. The device as claimed in claim 11 , wherein said tube comprises a single wall made of stainless steel.

13. The device as claimed in claim 1 , wherein said means for conveying comprises a tube inside which the recirculated exhaust gases circulate, said tube comprising a double wall made of aluminum.

14. The device as claimed in claim 1 , wherein said means for conveying comprises a tube inside which the recirculated exhaust gases circulate, said tube comprising a double wall made of stainless steel.

15. The device as claimed in claim 1 , further comprising a heat exchanger comprising a heat exchange bundle for cooling the supercharging air.

16. The device as claimed in claim 2 , wherein said thermal insulation means comprise said supercharging air deflector placed upstream of said means for conveying in the direction of circulation of the supercharging air, said deflector diverting the stream of supercharging air so that it bypasses said means for conveying.

17. The device as claimed in claim 1 , wherein said means for conveying comprises a tube which includes a series of injection holes for allowing the injection of recirculated exhaust gases into the stream of supercharged air.

18. The device as claimed in claim 17 , wherein said tube extends over said entire width of said manifold.

19. The device as claimed in claim 17 , said supercharging air deflector comprises a shield of rectangular and planar shape which extends away from said tube such that said shield shelters said tube from the stream of supercharged air.

20. The device as claimed in claim 17 , wherein said supercharging air deflector comprises a bent surface such that said supercharging air deflector bends around a circumference of said tube.

Assignees

• Odillard Laurent
• Devedeux Sebastien
• Galland Jean-Pierre
• Burgold Sven
• Valeo Systemes Thermiques

Inventors

• Odillard Laurent
• Devedeux Sebastien
• Galland Jean-Pierre
• Burgold Sven

Classifications

• F02M35/1045

  characterised by the charge distribution between the cylinders/combustion chambers or its homogenisation · CPC title

• F02M26/18

  Thermal insulation or heat protection · CPC title

• F02M26/09 Primary

  Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine · CPC title

• F02B29/04

  Cooling of air intake supply · CPC title

• F02M35/10222

  Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission · CPC title