Burner for a motor vehicle

Patent metadata

Field	Value
Publication number	US-12049841-B2
Application number	US-202218551798-A
Country	US
Kind code	B2
Filing date	Mar 22, 2022
Priority date	Mar 25, 2021
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

A burner for an exhaust gas tract that can be flowed through by exhaust gas of an internal combustion engine includes a combustion chamber, in which a mixture comprising air and a liquid fuel is to be ignited and thus to be combusted, and an inner swirl chamber that can be flowed through by a first part of the air. The inner swirl chamber has a first swirl generation device via which a turbulent flow of the first part of the air can be caused and a first outflow opening that can be flowed through by the first part of the air flowing through the inner swirl chamber. The first part of the air being able to be removed from the inner swirl chamber via the first outflow opening.

First claim

The invention claimed is:

1. A burner ( 42 ) for an exhaust gas tract ( 26 ) that is flowable through by exhaust gas of an internal combustion engine ( 12 ) of a motor vehicle, comprising:
a combustion chamber ( 58 ) in which a mixture comprising air and a liquid fuel is ignitable and combustible;
an inner swirl chamber ( 62 ) that is flowable through by a first part of the air, wherein the inner swirl chamber ( 62 ) has a first swirl generation device ( 115 ) that causes a turbulent flow of the first part of the air and has a first outflow opening ( 64 ) that is flowable through by the first part of the air flowing through the inner swirl chamber ( 62 ) and via which the first part of the air is removable from the inner swirl chamber ( 62 );
an introduction element ( 66 ) that is flowable through by the liquid fuel and via which the liquid fuel is introducible into the inner swirl chamber ( 62 ), wherein the first outflow opening ( 64 ) is flowable through by liquid fuel removed from the introduction element ( 66 );
an outer swirl chamber ( 76 ) that surrounds at least one longitudinal region of the inner swirl chamber ( 62 ) in a peripheral direction of the inner swirl chamber ( 62 ), wherein the outer swirl chamber ( 76 ) is flowable through by a second part of the air, wherein the outer swirl chamber ( 76 ) has a second swirl generation device ( 117 ) that causes a turbulent flow of the second part of the air and has a second outflow opening ( 80 ) that is flowable through by the second part of the air flowing through the outer swirl chamber ( 76 ), by liquid fuel flowing through the first outflow opening ( 64 ), and by the first part of the air flowing through the inner swirl chamber ( 62 ) and the first outflow opening ( 64 ), and wherein the first part of the air and the second part of the air and the liquid fuel are introducible into the combustion chamber ( 58 ) via the second outflow opening ( 80 );
a dividing wall ( 210 ) that has a longitudinal region (LW) disposed upstream of the first swirl generation device ( 115 ) and the second swirl generation device ( 117 ) in a flow direction of the first part of the air flowing through the inner swirl chamber ( 62 ) and the second part of the air flowing through the outer swirl chamber ( 76 );
wherein an inner air feed chamber ( 206 ) is separated from an outer air feed chamber ( 208 ) by the longitudinal region (LW) except for exactly one overflow opening ( 212 ) formed in the longitudinal region (LW);
wherein the inner air feed chamber ( 206 ) is assigned to the inner swirl chamber ( 62 ) and is disposed upstream of the first swirl generation device ( 115 ) and wherein the first part of the air is feedable to the inner swirl chamber ( 62 ) via the inner air feed chamber ( 206 );
wherein the outer air feed chamber ( 208 ) is assigned to the outer swirl chamber ( 76 ), is disposed upstream of the second swirl generation device ( 117 ), is fluidically connected to the inner air feed chamber ( 206 ) via the overflow opening ( 212 ), and surrounds the inner air feed chamber ( 206 ) in a peripheral direction of the inner air feed chamber ( 206 ) and wherein the second part of the air is feedable to the outer swirl chamber ( 76 ) via the outer air feed chamber ( 208 ); and
a feeding conduit ( 218 ) that is flowable through by the air and which leads into the outer air feed chamber ( 208 ), wherein the air is introducible into the outer air feed chamber ( 208 ) via the feeding conduit ( 218 ), wherein the first part of the air is transferrable into the inner air feed chamber ( 206 ) from the outer feed chamber ( 208 ) via the overflow opening ( 212 ), and wherein the air introduced into the outer air feed chamber ( 208 ) is dividable into the first part of the air and the second part of the air.

2. The burner ( 42 ) according to claim 1 , wherein the introduction element ( 66 ) has an exit opening ( 70 ) that is flowable through by the liquid fuel and via which the liquid fuel is removable from the introduction element ( 66 ) and wherein the introduction element ( 66 ) leads directly into the inner air feed chamber ( 206 ).

3. The burner ( 42 ) according to claim 2 , further comprising a guidance body ( 113 ) that is disposed in the inner air feed chamber ( 206 ) and faces the introduction element ( 66 ), wherein the guidance body ( 113 ) is convexly domed towards the introduction element ( 66 ) and is disposed at least partially upstream of the first swirl generation device ( 115 ).

4. The burner ( 42 ) according to claim 1 , wherein the first outflow opening ( 64 ) ends in a flow direction of the first part of the air flowing through the first outflow opening ( 64 ) on an end edge (K) machined in a targeted manner that is formed by an atomizing lip ( 84 ) that tapers in the flow direction of the first part of the air flowing through the first outflow opening ( 64 ) up to the end edge (K) and ends on the end edge (K).

5. The burner ( 42 ) according to claim 4 , wherein the end edge (K) is mechanically machined.

6. The burner ( 42 ) according to claim 1 , further comprising a cooling jacket ( 222 ) surrounding at least one longitudinal region (LBE) of the introduction element ( 66 ) in a peripheral direction of the introduction element ( 66 ), wherein the cooling jacket is flowable through by a cooling fluid.

7. The burner ( 42 ) according to claim 6 , wherein the cooling fluid is a liquid.

8. The burner ( 42 ) according to claim 1 , further comprising an ignition device ( 60 ) with a plurality of cooling ribs ( 230 ), wherein the plurality of cooling ribs ( 230 ) protrude outward in a radial direction of the ignition device ( 60 ) from a base body ( 224 ) of the ignition device ( 60 ) and are spaced apart from one another in a longitudinal extension direction ( 228 ) of the base body ( 224 ).

9. The burner ( 42 ) according to claim 8 , wherein a cooling rib ( 230 ) of the plurality of cooling ribs ( 230 ) has a plurality of through openings ( 232 ).

10. The burner ( 42 ) according to claim 1 , further comprising a closing element ( 132 ) that is movable relative to the first outflow opening ( 64 ) and the second outflow opening ( 80 ) between a closed position fluidically blocking at least one of the first outflow opening ( 64 ) and the second outflow opening ( 80 ) and an open position releasing the at least one of the first outflow opening ( 64 ) and the second outflow opening ( 80 ).

Assignees

• Mercedes Benz Group Ag

Inventors

• Zoeller Herbert

Classifications

• H01T13/16

  Means for dissipating heat · CPC title

• F01N3/204

  using an exhaust gas igniter, e.g. a spark or glow plug, without introducing fuel into exhaust duct · CPC title

• F01N2610/1453

  Sprayers or atomisers; Arrangement thereof in the exhaust apparatus · CPC title

• F01N2470/24

  Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled · CPC title

• F01N2240/14

  a fuel burner · CPC title