Heat recovery device and exhaust line fitted with such device

Patent metadata

Field	Value
Publication number	US-10337382-B2
Application number	US-201515540345-A
Country	US
Kind code	B2
Filing date	Dec 30, 2015
Priority date	Dec 31, 2014
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A heat recovery device comprises a valve body inwardly defining a direct flow path for exhaust gases from an inlet to an outlet, a heat exchanger comprising a flow passage for the exhaust gases emerging in an inlet zone of the valve body, and a gate positioned in the valve body. The heat recovery device comprises a guide wall positioned in the direct flow path at the inlet zone, arranged to guide the exhaust gases from the inlet toward the cutoff section away from the inlet zone when the gate frees the direct flow path, and delimiting at least one orifice to allow the exhaust gases to go to the inlet zone when the gate closes off the direct flow path.

First claim

The invention claimed is:

1. A heat recovery device for an exhaust line, the heat recovery device comprising:
a valve body having at least one exhaust gas inlet and at least one exhaust gas outlet, the valve body inwardly defining a direct flow path for exhaust gases from the exhaust gas inlet to the exhaust gas outlet;
a heat exchanger to exchange heat between the exhaust gases and a heat transfer fluid, the heat exchanger comprising a flow path for the exhaust gases and a flow path for the heat transfer fluid, the flow path for the exhaust gases having upstream and downstream ends respectively emerging through inlet and outlet surfaces of the valve body, respectively situated relatively closer to the exhaust gas inlet and relatively closer to the exhaust gas outlet along the direct flow path;
a shutter arranged in the valve body and movable relative to the valve body at least between a heat exchange position, in which the shutter closes off a cutoff section of the direct flow path and forces the exhaust gases to flow from the exhaust gas inlet to the exhaust gas outlet through the heat exchanger along the flow path, and a short-circuit position, in which the shutter frees said cutoff section of the direct flow path and closes off the outlet surface, the shutter forcing the exhaust gases to flow from the exhaust gas inlet to the exhaust gas outlet along the direct flow path, the cutoff section being situated between the inlet surface and the outlet surface along the direct flow path; and
wherein the heat recovery device comprises a guide wall arranged in the direct flow path in front of the inlet surface and arranged to guide the exhaust gases from the exhaust gas inlet toward the cutoff section away from the inlet surface when the shutter is in the short-circuit position, and defining at least one opening to allow the exhaust gases to flow to the inlet when the shutter is in the heat exchange position.

2. The device according to claim 1 , wherein the guide wall is a tube that inwardly defines a conduit for the exhaust gases, the conduit extending from an upstream opening situated upstream from the inlet surface to a downstream opening situated downstream from the inlet surface.

3. The device according to claim 1 , wherein the device comprises, in the cutoff section, at least one obstacle able to hinder flow of the exhaust gases, and wherein a downstream end part of the guide wall is arranged to deflect the exhaust gases away from the at least one obstacle.

4. The device according to claim 3 , wherein the at least one obstacle comprises a frame defining a sealing face for the shutter in the heat exchange position.

5. The device according to claim 4 , wherein the frame has an inner edge defining a central opening for the passage of the exhaust gases, and wherein a downstream end part of the guide wall is connected to the inner edge.

6. The device according to claim 1 , wherein the guide wall is delimited in an upstream direction by an upstream edge sealably connected to an inner surface of the direct flow path.

7. The device according to claim 1 , wherein the guide wall is separated from the valve body by a gas layer, at least in front of the inlet surface, the direct flow path being at a first pressure at the outlet surface when the shutter is in the short-circuit position, and the gas layer being at a second pressure lower than the first pressure when the shutter is in the short-circuit position.

8. The device according to claim 1 , wherein the heat exchanger comprises an enclosure inwardly delimiting the flow path for the heat transfer fluid and pressed against the valve body, the enclosure having at least one opening closed by a wall of the valve body in which the inlet surface is arranged.

9. The device according to claim 1 , wherein the shutter has a seal bearing against the valve body in the short-circuit position, the seal being made from a metal knit.

10. The device according to claim 1 , wherein the direct flow path offers, along the guide wall, a first passage section for the exhaust gases, the flow path offering, along the outlet surface, a second passage section for the exhaust gases, larger than the first passage section.

11. A vehicle exhaust line comprising:
a heat recovery device including a valve body having at least one exhaust gas inlet and at least one exhaust gas outlet, the valve body inwardly defining a direct flow path for exhaust gases from the exhaust gas inlet to the exhaust gas outlet;
a heat exchanger to exchange het between the exhaust gases and a heat transfer fluid, the heat exchanger comprising a flow path for the exhaust gases and a flow path for the heat transfer fluid, the flow path for the exhaust gases having upstream and downstream ends respectively emerging through inlet and outlet surface of the valve body, respectively situated relatively closer to the exhaust gas inlet and relatively closer to the exhaust gas outlet along the direct flow path;
a shutter arranged in the valve body and movable relative to the valve body at least between a heat exchange position, in which the shutter closes off a cutoff section of the direct flow path and forces the exhaust gases to flow from the exhaust gas inlet to the exhaust gas outlet through the heat exchanger along the flow path, and a short-circuit position, in which the shutter frees said cutoff section of the direct flow path and closes off the outlet surface, the shutter forcing the exhaust gases to flow from the exhaust gas inlet to the exhaust gas outlet along the direct flow path, the cutoff section being situated between the inlet surface and the outlet surface along the direct flow path; and
wherein the heat recovery device comprises a guide wall arranged in the direct flow path in front of the inlet surface and arranged to guide the exhaust gases from the exhaust gas inlet toward the cutoff section away from the inlet surface when the shutter is in the short-circuit position, and defining at least one opening to allow the exhaust gases to flow to the surface when the shutter is in the heat exchange position.

12. The device according to claim 1 , wherein the heat exchanger is located outside of the valve body.

13. The device according to claim 1 , wherein the shutter is located outside the guide wall when in the short-circuit position.

14. The device according to claim 1 , wherein the inlet surface includes a plurality of inlet holes and the heat exchanger includes a plurality of tubes inwardly defining the exhaust gas flow path, each tube having one upstream end and one downstream end, and wherein each tube is connected by the upstream end to one of the inlet holes.

15. The device according to claim 1 , wherein the at least one opening of the guide wall is pierced in an area of the guide wall facing the inlet surface of the valve body and parallel to the inlet surface.

16. The device according to claim 1 , wherein a downstream end part of the guide wall is located upstream of the cutoff section along the direct flow path.

17. The device according to claim 1 , wherein the guide wall is inserted radially between a central axis of the valve body and the inlet surface.

18. The device according to claim 17 , wherein the guide wall is separated from the valve body by a gas layer that is positioned radially between an outer surface of the guide wall and the inlet surface.

19. The vehicle exhaust line according to claim 11 , wherein the shutter is located outside the guide wall when in the short-circuit position.

20. The vehicle exhaust line acc

Assignees

• Faurecia Systemes Dechappement
• Faurecia Systems Dechappement

Inventors

• Godard Yannick
• Cabillic Julien

Classifications

• F01N5/02 Primary

  the devices using heat · CPC title

• F01N2260/08

  for preventing heat loss or temperature drop, using other means than layers of heat-insulating material · CPC title

• F01N2240/02

  a heat exchanger · CPC title

• F01N2410/00

  By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device · CPC title

• F01N2240/20

  a flow director or deflector · CPC title