EXHAUST GAS COOLER

• US 20100162699A1
• Filed: 12/18/2009
• Published: 07/01/2010
• Est. Priority Date: 12/19/2008
• Status: Active Grant

• Current Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Original Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Inventors: Peters, Holger, Schwalk, Bernhard, Dittmann, Jörg, Rieger, Harald
• Granted Patent: US 8,627,880 B2
• Time in Patent Office: Days
• US Class Current: 60/605.200
• CPC Class Codes: F28D 21/0003 the heat being recuperated from exhaust gases F28D21/0014 takes precedence
• CPC Class Codes: F28D 7/1684 the conduits having a non-circular cross-section
• CPC Class Codes: F28F 1/42 the means being both outside and inside the tubular element
• CPC Class Codes: F28F 1/426 the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
• CPC Class Codes: F28F 2001/027 with dimples
• CPC Class Codes: F28F 3/042 in the form of local deformations of the element
• CPC Class Codes: F28F 3/046 the deformations being linear, e.g. corrugations
• CPC Class Codes: F28F 9/02 Header boxes; End plates

Abstract

The present invention relates to an exhaust gas cooler (1), in particular for an exhaust gas recirculation system of an internal combustion engine, preferably of a motor vehicle, comprising an exhaust gas inlet (2) which is connected in a communicating manner with an inlet chamber (4), an exhaust gas outlet (3) which is connected in a communicating manner with an outlet chamber (5), a plurality of exhaust gas pipes (7) which are configured as flat pipes, extend parallel to each other through a coolant chamber (8) and are connected in a communicating manner on one side to the inlet chamber (4) and on the other side to the outlet chamber (5), a coolant inlet (9) which is connected in a communicating manner to the coolant chamber (8), and a coolant outlet (10) which is connected in a communicating manner to the coolant chamber (8). The exhaust gas pipes (7) have on mutually opposite sides (28) a plurality of outwardly projecting protrusions (29) which are spaced apart from each other in the longitudinal direction (30) of the exhaust gas pipes (7).

A simplified cooling effect can be achieved if, with in each case two adjacent exhaust gas pipes (7), the protrusions (29) of one exhaust gas pipe (7) bear in each case directly against the other exhaust gas pipe (7) at a distance in the longitudinal direction (30) of the exhaust gas pipes (7) from the nearest protrusion (29) of the other exhaust gas pipe (7).

Claims

1. An exhaust gas recirculation system cooler, comprising:

motor vehicle

an exhaust gas inlet connected to and in fluid communication with an inlet chamber;

an exhaust gas outlet connected to and in fluid communication with an outlet chamber;

a plurality of generally flat exhaust gas pipes extend parallel to each other through a coolant chamber and are in fluid communication with to the inlet chamber on one side and to the outlet chamber on an opposite side;

a coolant inlet connected to and in fluid communication with the coolant chamber; and

a coolant outlet connected to and in fluid communication with the coolant chamber,

wherein the exhaust gas pipes include a plurality of outwardly projecting protrusions spaced apart from each other in a longitudinal direction of the exhaust gas pipes, wherein the protrusions of one exhaust gas pipe bear directly against an adjacent exhaust gas pipe at a distance in the longitudinal direction of the exhaust gas pipes from the nearest protrusion of the other exhaust gas pipe.

2. An exhaust gas recirculation system cooler according to claim 1, such that the protrusions on the side of the exhaust gas pipe are adjacent to each other along a straight line extending parallel in the longitudinal direction of the exhaust gas pipe.

3. An exhaust gas recirculation system cooler according to claim 1, wherein the exhaust gas pipe protrusions on one side are arranged offset to the protrusions of the other side, by half of the longitudinal distance of the adjacent protrusions, in the longitudinal direction of the exhaust gas pipe.

4. An exhaust gas recirculation system cooler according to claim 1, such that the protrusions have a straight-edged shape, wherein a longitudinal direction of the straight-edged protrusions runs in an inclined manner to the longitudinal direction of the respective exhaust gas pipe.

5. An exhaust gas recirculation system cooler according to claim 4, wherein the straight-edged protrusions extend parallel to each other, and/or the longitudinal direction of the protrusion is at least one of inclined at an approximate range between 40°

and 50°

inclusive and by approximately 45°

to the longitudinal direction of the exhaust gas pipe and/or the longitudinal direction of the protrusions on one side of the exhaust gas pipe is oriented parallel to the longitudinal direction of the protrusions on the other side of the respective exhaust gas pipe.

6. An exhaust gas recirculation system cooler according to claim 1, wherein the protrusions have a generally circular configuration in a projection which is oriented perpendicularly to a plane of the exhaust gas pipe.

7. An exhaust gas recirculation system cooler according to claim 1, wherein the exhaust gas pipes have a plurality of inwardly projecting depressions on opposite sides, such that the depressions are at a distance from each other in the longitudinal direction of the exhaust gas pipes, wherein the depressions and the protrusions alternate in the longitudinal direction of the exhaust gas pipe.

8. An exhaust gas recirculation system cooler according to claim 7, wherein the protrusions of one exhaust gas pipe bear against the other exhaust gas pipe in a region of at least one depression of the other exhaust gas pipe.

9. An exhaust gas recirculation system cooler according to claim 7, wherein the depressions have a straight-edged shape, such that a longitudinal direction of the straight-edged depressions run in an inclined manner in the longitudinal direction of the exhaust gas pipe.

10. An exhaust gas recirculation system cooler according to claim 9, wherein the straight-edged depressions extend parallel to each other, and/or the longitudinal direction of the respective depression is at least one of inclined at an approximate range between 40°

and 50°

inclusive and by approximately 45°

to the longitudinal direction of the respective exhaust gas pipe, and/or the longitudinal direction of the straight-edged depressions extends parallel to the longitudinal direction of the straight-edged protrusions, and/or

the longitudinal direction of the depressions on one side of the exhaust gas pipe is oriented parallel to the longitudinal direction of the depressions on the other side of the exhaust gas pipe.

11. An exhaust gas recirculation system cooler according to claim 7, wherein the depressions are narrower than the protrusions in the longitudinal direction of the exhaust gas pipe, and/or the depressions are longer than the protrusions transversely to the longitudinal direction of the exhaust gas pipe.

12. An exhaust gas recirculation system cooler according to claim 7, wherein with at least two adjacent exhaust gas pipes, the protrusions of one exhaust gas pipe selectively bear against the other exhaust gas pipe in the region of the depressions of the other exhaust gas pipe such that a coolant path is produced which can be flowed through transversely with respect to the longitudinal direction of the exhaust gas pipes, and the coolant path communicates at its ends with the coolant chamber and is delimited between its ends by the depression on one side and by the protrusion on the other.

13. An exhaust gas recirculation system cooler according to claim 7, wherein the depressions on the mutually opposite sides of the exhaust gas pipe project and bear against each other in an interior of the exhaust gas pipe.

21. An exhaust gas recirculation system cooler according to claim 1, wherein at least two stacks of exhaust gas pipes are at least one of stacked on top of each other, bear against each other and are arranged next to each other in the coolant chamber.

22. An exhaust gas recirculation system cooler according to claim 1, wherein the exhaust gas pipes penetrate a wall on at least one of the inlet and/o outlet side and the exhaust gas pipes are fixedly connected to the wall, and

the wall separates the coolant chamber from at least one of the inlet chamber and from the outlet chamber.

23. An exhaust gas recirculation system cooler according to claim 1, wherein the coolant chamber is surrounded by a housing, such that a housing cross section is larger than a cross section of the exhaust gas outlet and is larger than a cross section of the exhaust gas inlet.

24. An exhaust gas recirculation system cooler according to claim 22, wherein the wall abuts an edge against an inner side of the housing and is connected edge to edge to the housing.

25. An exhaust gas recirculation system cooler according to claim 23, wherein the inlet chamber is surrounded by an inlet funnel, which connects the exhaust gas inlet to the housing.

26. An exhaust gas recirculation system cooler according to claim 23, wherein the outlet chamber is surrounded by an outlet funnel which connects the exhaust gas outlet to the housing.

27. An exhaust gas recirculation system cooler according to claim 25, wherein at least one of the inlet funnel and/or the outlet funnel is placed onto the housing from the outside.

28. An exhaust gas recirculation system cooler according to claim 27, wherein the wall is arranged in an overlap region of the funnel.

29. An exhaust gas recirculation system cooler according to claim 1, wherein at least one of the:

exhaust gas inlet, an inlet pipe which has the exhaust gas inlet, the exhaust gas outlet, an outlet pipe which has the exhaust gas outlet, the coolant inlet an inlet connecting piece which has the coolant inlet, the coolant outlet an outlet connecting piece which has the coolant outlet, the exhaust pipes, housing, an inlet-side wall, outlet-side wall, inlet funnel, outlet funnel, an inlet flange which comprises the exhaust gas inlet, and an outlet flange which comprises the exhaust gas outlet is produced from stainless steel.

30. An exhaust gas recirculation system cooler according to claim 1, wherein at least one of the components fixed to the exhaust gas cooler and at least two components fixed to the exhaust gas cooler are fixed to each other by a welded connection.

14. An exhaust gas recirculation system cooler, comprising:

an exhaust gas inlet connected to and in fluid communication with an inlet chamber;

an exhaust gas outlet connected to and in fluid communication with an outlet chamber;

a plurality of exhaust gas pipes, which are configured as flat pipes, extend parallel to each other through a coolant chamber and are in fluid communication with the inlet chamber on one side and to the outlet chamber on the other side;

a coolant inlet connected to and in fluid communication with the coolant chamber; and

a coolant outlet connected to and in fluid communication with the coolant chamber;

wherein the exhaust gas pipes have a plurality of inwardly projecting depressions on opposite sides, such that adjacent exhaust gas pipes bear directly against each other on the sides, which contain the depressions, and

the depressions are at least one of configured and/or arranged such a that they form at least one coolant path which can be flowed through transversely with respect to a longitudinal direction of the exhaust gas pipes and are in fluid communication with the coolant chamber.

15. An exhaust gas recirculation system cooler according to claim 14, wherein the depressions are arranged adjacent to each other transversely to the longitudinal direction of the exhaust gas pipe.

16. An exhaust gas recirculation system cooler according to claim 14, wherein the depressions extend continuously from one longitudinal end region of the exhaust gas pipe to another longitudinal end region of the exhaust gas pipe.

17. An exhaust gas recirculation system cooler according to claim 14, wherein the depressions extend in at least one of a wave-like and snake-like manner in the longitudinal direction.

18. An exhaust gas recirculation system cooler according to claim 14, wherein the depressions are at least one of formed and arranged such a that the depressions of the sides, which bear against each other of the adjacent exhaust gas pipes intersect repeatedly along the longitudinal direction.

19. An exhaust gas recirculation system cooler according to claim 14, wherein the depressions are at least one of formed and/or arranged such a that the depressions of the opposite sides in an interior of the exhaust gas pipe intersect repeatedly along the longitudinal direction in a projection which is oriented perpendicularly to a plane of the exhaust gas pipe.

20. An exhaust gas recirculation system cooler according to claim 14, wherein the depressions on the opposite sides of the exhaust gas pipe project and bear against each other in an interior of the exhaust gas pipe.