David W Bretz

US Patent:

6688534, Feb 10, 2004

Filed:

Mar 7, 2001

Appl. No.:

09/800701

Inventors:

David H. Bretz - West Des Moines IA

Assignee:

Delavan Inc - West Des Moines IA

International Classification:

A62C 502

US Classification:

239 8, 239135, 239398, 239403, 239406, 239422, 239423

Abstract:

A fuel injector for a gas turbine is disclosed which includes a nozzle body having a discharge portion defining a discharge orifice, the discharge portion including a fuel circuit for directing a hollow fuel film toward the discharge orifice from a fuel pump associated with the gas turbine, and an air assist circuit for directing pressurized air from a source external to the gas turbine toward the fuel film upstream from the discharge orifice to impinge on an inner surface of the fuel film issuing from the discharge orifice.

US Patent:

7779636, Aug 24, 2010

Filed:

Apr 6, 2006

Appl. No.:

11/399634

Inventors:

Philip E. O. Buelow - West Des Moines IA, US
Brandon P. Williams - Riviera Beach FL, US
David H. Bretz - West Des Moines IA, US
Michael Spooner - Derby, GB
Caroline Mohamed - Derby, GB
Helen Gill - Nottingham, GB

Assignee:

Delavan Inc - West Des Moines IA

International Classification:

F02C 3/24
F23R 3/14
F23R 3/34
F23R 3/36

US Classification:

60742, 60743, 60748

Abstract:

A lean direct injection fuel nozzle for a gas turbine is disclosed which includes a radially outer main fuel delivery system including a main inner air swirler defined in part by a main inner air passage having a radially inner wall with a diverging downstream surface, an intermediate air swirler radially inward of the main inner air swirler for providing a cooling air flow along the downstream surface of the radially inner wall of the main inner air passage, and a radially inner pilot fuel delivery system radially inward of the intermediate air swirler.

US Patent:

7926744, Apr 19, 2011

Filed:

Feb 21, 2008

Appl. No.:

12/070828

Inventors:

Neal A. Thomson - West Des Moines IA, US
Philip E. O. Buelow - West Des Moines IA, US
David H. Bretz - West Des Moines IA, US

Assignee:

Delavan Inc - West Des Moines IA

International Classification:

B05B 7/10
B05B 7/04
F02C 1/00

US Classification:

239405, 2394345, 60742, 60743, 60748

Abstract:

An air-blast fuel injector is disclosed which includes an outer air circuit having an exit portion, an inner air circuit having an outlet configured to direct air toward the exit portion of the outer air circuit, and a fuel circuit radially outboard of the inner air circuit and having an exit communicating with the outer air circuit upstream from the exit portion of the outer air circuit.

US Patent:

8057220, Nov 15, 2011

Filed:

Feb 1, 2008

Appl. No.:

12/012336

Inventors:

David H. Bretz - West Des Moines IA, US

Assignee:

Delavan Inc - West Des Moines IA

International Classification:

F23D 11/00
B05B 7/10

US Classification:

431159, 431175, 239406

Abstract:

Disclosed is an air-assisted simplex spray nozzle assembly for a fuel burner that includes, inter alia, a nozzle body that has opposed upstream and downstream ends, wherein the downstream end of the nozzle body defines a fuel outlet, an adapter member that is engaged with the upstream end of the nozzle body and defines concentrically positioned air and fuel inlets for the nozzle assembly and an air cap that is positioned over the downstream end of the nozzle body. The nozzle assembly further includes a fuel circuit and a first air circuit. The fuel circuit directs fuel from a fuel pump toward the fuel outlet of the nozzle body. The fuel circuit extends from the fuel inlet of the adapter member through the nozzle body to the fuel outlet. The first air circuit directs assist air towards the fuel exiting from the fuel outlet. The first air circuit extends from the air inlet of the adapter member, through a gap defined between the air cap and the nozzle body and merges with the fuel emitted from the fuel outlet of the nozzle body.

US Patent:

8128007, Mar 6, 2012

Filed:

Dec 17, 2010

Appl. No.:

12/928776

Inventors:

Neal A. Thomson - West Des Moines IA, US
Philip E. O. Buelow - West Des Moines IA, US
David H. Bretz - West Des Moines IA, US

Assignee:

Delavan Inc - West Des Moines IA

International Classification:

B05B 7/10
B05B 7/04
F02C 1/00

US Classification:

239405, 239434, 2394345, 60742, 60743, 60748

Abstract:

An air-blast fuel injector is disclosed which includes an outer air circuit having an exit portion, an inner air circuit having an outlet configured to direct air toward the exit portion of the outer air circuit, and a fuel circuit radially outboard of the inner air circuit and having an exit communicating with the outer air circuit upstream from the exit portion of the outer air circuit.

US Patent:

8146837, Apr 3, 2012

Filed:

Dec 17, 2010

Appl. No.:

12/928728

Inventors:

Neal A. Thomson - West Des Moines IA, US
Philip E. O. Buelow - West Des Moines IA, US
David H. Bretz - West Des Moines IA, US

Assignee:

Delavan Inc - West Des Moines IA

International Classification:

B05B 7/10
B05B 7/04
F02C 1/00

US Classification:

239405, 2394345, 60742, 60743, 60748

Abstract:

An air-blast fuel injector is disclosed which includes an outer air circuit having an exit portion, an inner air circuit having an outlet configured to direct air toward the exit portion of the outer air circuit, and a fuel circuit radially outboard of the inner air circuit and having an exit communicating with the outer air circuit upstream from the exit portion of the outer air circuit.

US Patent:

8156746, Apr 17, 2012

Filed:

Jul 20, 2010

Appl. No.:

12/804374

Inventors:

Philip E. O. Buelow - West Des Moines IA, US
Brandon P. Williams - Urbandale IA, US
David H. Bretz - West Des Moines IA, US
Michael Spooner - Derby, GB
Caroline Mohamed - Derby, GB
Helen Gill - Nottingham, GB

Assignee:

Delavan Inc - West Des Moines IA

International Classification:

F02C 3/24
F23R 3/14
F23R 3/34

US Classification:

60776

Abstract:

A lean direct injection fuel nozzle for a gas turbine is disclosed which includes a radially outer main fuel delivery system including a main inner air swirler defined in part by a main inner air passage having a radially inner wall with a diverging downstream surface, an intermediate air swirler radially inward of the main inner air swirler for providing a cooling air flow along the downstream surface of the radially inner wall of the main inner air passage, and a radially inner pilot fuel delivery system radially inward of the intermediate air swirler.

US Patent:

20040139750, Jul 22, 2004

Filed:

Jan 5, 2004

Appl. No.:

10/751583

Inventors:

David Bretz - West Des Moines IA, US

International Classification:

F02C007/22

US Classification:

060/776000, 060/740000

Abstract:

A fuel injector for a gas turbine is disclosed which includes a nozzle body having a discharge portion defining a discharge orifice, the discharge portion including a fuel circuit for directing a hollow fuel film toward the discharge orifice from a fuel pump associated with the gas turbine, and an air assist circuit for directing pressurized air from a source external to the gas turbine toward the fuel film upstream from the discharge orifice to impinge on an inner surface of the fuel film issuing from the discharge orifice.