Truck provided with a device for lowering the temperature of exhaust gas

Patent metadata

Field	Value
Publication number	US-9581064-B2
Application number	US-201314384595-A
Country	US
Kind code	B2
Filing date	Mar 11, 2013
Priority date	Mar 12, 2012
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A device for use in a truck for lowering the temperature of exhaust gas of a combustion engine has a diffuser 1 , which is provided with a cylindrical housing 3 provided with an inlet opening 5 in an end wall 7 and an elongated axially extending outlet opening 9 in the cylinder wall.
The device furthermore has a bent guide plate 25 which extends from the outlet opening 9 , so that, as a result of the Coanda effect, the hot exhaust gas is diverted along the plate and the jet widens, so that a better mixing with the ambient air, and hence greater cooling, takes place.

First claim

The invention claimed is:

1. An exhaust system comprising a muffler and a diffuser for lowering the temperature of exhaust gas of a combustion engine, wherein the diffuser comprises a housing having a cylinder wall and first and second end walls, an inlet opening in one of the first and second end walls, and an elongated outlet opening in the cylinder wall, extending in an axial direction of the housing, the outlet opening being larger than the inlet opening, wherein the diffuser further comprises an inlet tube extending parallel to the cylinder wall within the housing, wherein the inlet tube has one end connected to the inlet opening and comprises a tube wall perforated with holes, and wherein a length side of the elongated outlet opening is adjacent a bent wall and is configured to provide an outflow direction of the exhaust gas parallel to the bent wall, wherein the bent wall is one of (i) a part of a downwardly facing side of the muffler and and (ii) formed by a bent guide plate attached to the housing of the diffuser on a side of the housing opposite which suction openings are present to allow ambient air to flow into the housing for mixing with the exhaust gas near the outlet opening.

2. A truck comprising a combustion engine and the exhaust system of claim 1 for combustion gases, wherein the elongated outlet opening faces a side of the truck and is configured to discharge the exhaust gas on the side of the truck in a direction orthogonal to a direction of motion of the truck.

3. The truck according to claim 2 , wherein the bent guide plate comprises ribs which extend at right angles to the outlet opening.

4. The truck according to claim 3 , wherein side edges of the bent guide plate are flanged over at right angles, such that they guide the exhaust gas.

5. The truck according to claim 2 , wherein the other of the first and second end walls is closed.

6. The truck according to claim 5 , wherein the outlet opening extends over a greater part of the length of the cylinder wall.

7. The truck according to claim 2 , wherein at least one partition is positioned in the housing and is parallel to the first and second end walls, and wherein the at least one partition includes an opening through which the inlet tube extends.

8. The exhaust gas system of claim 1 , wherein the side of the housing of the diffuser to which the bent guide plate is attached is the length side of the outlet opening, whereby the bent guide plate is configured to provide an outflow direction from the outlet opening parallel to the bent guide plate and create a Coanda effect, and wherein the suction openings are adjacent a second length side of the outlet opening, opposite the length side of the outlet opening to which the bent guide plate is attached.

9. The exhaust gas system of claim 8 , wherein the bent guide plate comprises ribs, including both centrally disposed ribs and peripherally disposed ribs, which extend at right angles to the outlet opening.

10. The exhaust gas system of claim 9 , wherein side edges of the bent guide plate are flanged over at right angles, such that they guide the exhaust gas.

11. The exhaust gas system of claim 1 , wherein the outlet opening extends over a greater part of the length of the cylinder wall.

12. The exhaust gas system of claim 1 , wherein at least one partition is positioned in the housing and is parallel to the first and second end walls, and wherein the at least one partition includes an opening through which the inlet tube extends.

13. The exhaust gas system of claim 12 , wherein the suction openings are configured for mixing the ambient air with different portions of the exhaust gas that are separated by the at least one partition.

Assignees

• Daf Trucks Nv

Inventors

• Janssen Franciscus Thomas Everardus
• Saberi Josef

Classifications

• F01N3/05 Primary

  by means of air, e.g. by mixing exhaust with air (silencers working by addition of air to exhaust F01N1/14; arrangements for the supply of additional air for the thermal or catalytic conversion of noxious components of exhaust F01N3/30) · CPC title

• F01N13/20

  having flared outlets, e.g. of fish-tail shape · CPC title

• F01N2270/02

  for cooling exhaust gases or the apparatus · CPC title

• F01N13/082 Primary

  of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation (F01N13/20 takes precedence) · CPC title

• F01N2470/02

  Tubes being perforated · CPC title