Carbon contamination resistant pressure atomizing nozzles

Patent metadata

Field	Value
Publication number	US-9309848-B2
Application number	US-201414512305-A
Country	US
Kind code	B2
Filing date	Oct 10, 2014
Priority date	Sep 29, 2010
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A pressure atomizing nozzle for injecting fuel includes an inlet housing configured to thermally isolate the interior space from external conditions and to remain relatively cool under operation so as to substantially eliminate heat soak back from the inlet housing to the interior space thereof after operation. First and second coolant conduits cool the nozzle tip region actively during operation and passively after operation. A cooling air jacket is configured to thermally isolate inboard components from exterior conditions, to provide clean air during operation to the nozzle tip region for diluting carbon to reduce carbon deposits in the nozzle tip region and for cooling the same, and to provide passive cooling to the nozzle tip region after operation.

First claim

What is claimed is:

1. A spray nozzle, comprising:
a) an inlet housing including a fuel inlet, wherein the inlet housing defines an interior space and is configured to thermally isolate the interior space from external conditions during operation and to reduce heat soak back from the inlet housing to the interior space thereof after operation;
b) a fuel conduit mounted in the interior space of the inlet housing in fluid communication with the fuel inlet for providing fuel to a spray nozzle mounted to the fuel, conduit; and
c) a cooling air jacket mounted to the inlet housing outboard of the fuel conduit and spray nozzle for conducting a flow of cooling air to nozzle tip region proximate an outlet end of the spray nozzle wherein the cooling air jacket is configured to thermally isolate inboard components from exterior conditions, to provide clean air during operation to the nozzle tip region for diluting carbon to reduce carbon deposits on the spray nozzle and for cooling the same, and to conduct air for passive cooling of the nozzle tip region after operation,
wherein the fuel conduit is a first fuel conduit, wherein the spray nozzle is a first spray nozzle, wherein the fuel inlet is a first fuel stage inlet, wherein the inlet housing includes a second fuel stage inlet, and further comprising a second fuel conduit mounted in the interior space of the inlet housing outboard of the first fuel conduit and in fluid communication with the second fuel stage inlet for providing fuel to a second spray nozzle mounted outboard of the first spray nozzle.

2. A spray nozzle as recited in claim 1 , wherein the inlet housing includes a cooling air inlet in fluid communication with an air flow circuit within the cooling air jacket for supplying cooling air during operation.

3. A spray nozzle as recited in claim 1 , wherein the cooling air jacket includes a cooling air inlet in fluid communication with an air flow circuit within the cooling air jacket for supplying cooling air during operation.

4. A spray nozzle as recited in claim 1 , further comprising:
d) a coolant conduit mounted outboard of the fuel conduit for circulating coolant in the nozzle tip region for cooling the spray nozzle; and
e) heat shield mounted inboard of the cooling air jacket and outboard of the coolant conduit to provide thermal isolation therebetween.

5. A. spray nozzle as recited in claim 1 , wherein the cooling air jacket includes an outlet aperture in proximity with the spray nozzle for providing an outlet for the spray nozzle and cooling air.

Assignees

• Delavan Inc

Inventors

• Prociw Lev A
• Thompson Kevin E
• Myers Steve J

Classifications

• F01N3/0253

  adding fuel to exhaust gases · CPC title

• F02M53/08 Primary

  with air cooling · CPC title

• Y02T10/20

  Cross-Sectional Technologies · mapped topic

• F01N3/36 Primary

  Arrangements for supply of additional fuel · CPC title

• F01N2610/03

  the substance being hydrocarbons, e.g. engine fuel · CPC title