Exhaust treatment apparatus for engine

Patent metadata

Field	Value
Publication number	US-9765671-B2
Application number	US-201414196540-A
Country	US
Kind code	B2
Filing date	Mar 4, 2014
Priority date	Mar 29, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

An engine exhaust treatment apparatus, which suppresses thermal damage to an electrothermal ignition apparatus, includes: an exhaust passage; an oxidation catalyst disposed in the exhaust passage; a combustible gas generator; a combustible gas supplying passage; a heat dissipation port opened upstream in the exhaust passage from the oxidation catalyst and in a downstream part of the combustible gas supplying passage, the exhaust passage and the combustible gas supplying passage communicating with each other through the heat dissipation port; and an electrothermal ignition apparatus disposed in the combustible gas supplying passage. Heat of flaming combustion of the combustible gas ignited by the electrothermal ignition apparatus is supplied to the exhaust passage, to raise the temperature of exhaust in the exhaust passage. A heat dissipation plate is attached to an outer projecting portion of the electrothermal ignition apparatus. The outer projecting portion projects outside a wall of the exhaust treatment apparatus.

First claim

What is claimed is:

1. An exhaust treatment apparatus for an engine comprising:
a wall;
an exhaust passage;
an oxidation catalyst disposed in the exhaust passage;
a combustible gas generator;
a combustible gas supplying passage;
a cooling air passage;
a heat dissipation port opened upstream in the exhaust passage from the oxidation catalyst and in a downstream part in the combustible gas supplying passage, the exhaust passage and the combustible gas supplying passage communicating with each other through the heat dissipation port; and
an electrothermal ignition apparatus having an outer projecting portion and disposed in the combustible gas supplying passage, wherein heat of flaming combustion of combustible gas ignited by the electrothermal ignition apparatus is supplied to the exhaust passage, to raise a temperature of exhaust in the exhaust passage,
the exhaust treatment apparatus for an engine further comprising:
a heat dissipation plate attached to an outer projecting portion of the electrothermal ignition apparatus, the outer projecting portion projecting outside the wall of the exhaust treatment apparatus,
wherein the heat dissipation plate is disposed in the cooling air passage, the outer projecting portion of the electrothermal ignition apparatus is surrounded by the heat dissipation plate, the heat dissipation plate is generally U-shaped in cross section perpendicular to a longitudinal axial direction of the electrothermal ignition apparatus, the heat dissipation plate includes an air blocking wall having two ends, the air blocking wall being provided in a downstream part in the cooling air passage, a sidewall extending from each of the two ends of the air blocking wall toward an upstream part in the cooling air passage, and
a ventilation entrance opened throughout a whole area between the ends of the extending portions of the two sidewalls.

2. The exhaust treatment apparatus for an engine according to claim 1 , wherein both sidewalls are provided with air discharging ports.

3. The exhaust treatment apparatus for an engine according to claim 2 , further comprising a power input terminal provided on the outer projecting portion of the electrothermal ignition apparatus, wherein a connection terminal of a power feeder cord is connected to the power input terminal, and the connection terminal of the power feeder cord is surrounded, together with the outer projecting portion of the electrothermal ignition apparatus, by the heat dissipation plate.

4. The exhaust treatment apparatus for an engine according to claim 1 , further comprising a power input terminal provided on the outer projecting portion of the electrothermal ignition apparatus, wherein a connection terminal of a power feeder cord is connected to the power input terminal, and the connection terminal of the power feeder cord is surrounded, together with the outer projecting portion of the electrothermal ignition apparatus, by the heat dissipation plate.

5. An exhaust treatment apparatus for an engine comprising:
a wall;
an exhaust passage;
an oxidation catalyst disposed in the exhaust passage;
a combustible gas generator;
a combustible gas supplying passage;
a cooling air passage;
a heat dissipation port opened upstream in the exhaust passage from the oxidation catalyst and in a downstream part in the combustible gas supplying passage, the exhaust passage and the combustible gas supplying passage communicating with each other through the heat dissipation port; and
an electrothermal ignition apparatus having an outer projecting portion and disposed in the combustible gas supplying passage, wherein heat of flaming combustion of combustible gas ignited by the electrothermal ignition apparatus is supplied to the exhaust passage, to raise a temperature of exhaust in the exhaust passage,
the exhaust treatment apparatus for an engine further comprising:
a heat dissipation plate attached to an outer projecting portion of the electrothermal ignition apparatus, the outer projecting portion projecting outside the wall of the exhaust treatment apparatus,
wherein the heat dissipation plate is disposed in the cooling air passage, the outer projecting portion of the electrothermal ignition apparatus is surrounded by the heat dissipation plate, the heat dissipation plate includes an air blocking wall having two ends, the air blocking wall being provided in a downstream part in the cooling air passage, a sidewall extending from each of the two ends of the air blocking wall toward an upstream part in the cooling air passage,
a ventilation entrance opened throughout a whole area between the ends of the extending portions of the two sidewalls,
a ventilation clearance formed at the wall of the exhaust treatment apparatus into which the electrothermal ignition apparatus is inserted,
wherein the electrothermal ignition apparatus includes an insert portion inserted into the wall of the exhaust treatment apparatus, part of the insert portion being exposed in the ventilation clearance, the ventilation clearance being disposed in the cooling air passage, and
wherein the electrothermal ignition apparatus is inserted into the wall of the exhaust treatment apparatus along an axial direction of the electrothermal ignition apparatus, and the wall of the exhaust treatment apparatus includes a ventilation clearance extending along a ventilation direction of the cooling air passage, the ventilation direction being orthogonal to the axial direction of the electrothermal ignition apparatus, and the ventilation clearance being formed between mutually-opposing portions of the wall of the exhaust treatment apparatus, and the mutually-opposing portions having surfaces that face each other and are exposed in the ventilation clearance.

6. The exhaust treatment apparatus for an engine according to claim 5 , wherein the heat dissipation plate is generally U-shaped in cross section.

7. An exhaust treatment apparatus for an engine comprising:
a wall;
an exhaust passage;
an oxidation catalyst disposed in the exhaust passage;
a combustible gas generator;
a combustible gas supplying passage;
a cooling air passage;
a heat dissipation port opened upstream in the exhaust passage from the oxidation catalyst and in a downstream part in the combustible gas supplying passage, the exhaust passage and the combustible gas supplying passage communicating with each other through the heat dissipation port; and
an electrothermal ignition apparatus having an outer projecting portion and disposed in the combustible gas supplying passage, wherein heat of flaming combustion of combustible gas ignited by the electrothermal ignition apparatus is supplied to the exhaust passage, to raise a temperature of exhaust in the exhaust passage,
the exhaust treatment apparatus for an engine further comprising:
a heat dissipation plate attached to an outer projecting portion of the electrothermal ignition apparatus, the outer projecting portion projecting outside the wall of the exhaust treatment apparatus,
a ventilation clearance formed at the wall of the exhaust treatment apparatus into which the electrothermal ignition apparatus is inserted,
wherein the electrothermal ignition apparatus includes an insert portion inserted into the wall of the exhaust treatment apparatus, part of the insert portion being exposed in the ventilation clearance, the ventilation clearance being disposed in the cooling air passage, and
wherein the electrothermal ignition apparatus is inserted into the wall of the exhaust treatment apparatus along an axial direction of the electrothermal ignition apparatus, and the wall of the exhaust treatment apparatus includes a ventilation clearance extending along a ventilation direction of the cooling air passage, the ventilation d

Assignees

• Kubota Kk

Inventors

• Koyama Hideyuki
• Akitomo Tomoya
• Tamaki Yuichi
• Komura Ryutaro

Classifications

• F23G7/07

  in which combustion takes place in the presence of catalytic material · CPC title

• F23G7/065

  using gaseous or liquid fuel · CPC title

• F01N2240/14

  a fuel burner · CPC title

• F01N3/38 Primary

  Arrangements for igniting · CPC title

• Y02T10/26

  Cross-Sectional Technologies · mapped topic