Patent US3785570A successfully refreshed from Google Patents.
US3785570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual orifice fuel nozzle with air-assisted primary at low flow rates
Assignee: United States Department of the Army
•
Filing: 1972-08-30
•
Granted: 1974-01-15
•
Expires: 1992-08-30
Abstract
Abstract A dual orifice liquid fuel nozzle for a combustion chamber including a pressure responsive valve to help produce smaller fuel droplets at lower fuel flow for more consistent combustion. The device comprises a valve housing having a coaxial fuel inlet, an inlet for a gas such as air, a spring-loaded movable valve telescopically mounted on the fuel inlet and a secondary passage. At low pressure fuel flow the movable valve permits the gas to contact the fuel so as to atomize it. When fuel pressure increases, the valve shuts off the gas, while permitting additional liquid fuel to enter the secondary passage.
Inventors
- 👤 S Krieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:30
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/10; F23D11/106; F23D11/107
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A tubular liquid fuel nozzle having a tubular primary fuel passageway mounted in coaxial arrangement in said fuel nozzle, a tubular valve telescopically mounted on the inner portion of said tubular primary fuel passageway and movable by fuel flow pressure between a first position at low fuel flow pressure and a second position at increased fuel flow pressure, said valve having a reduced inner portion of smaller diameter than the inside diameter of said reduced portion of said fuel nozzle whereby a secondary passageway is formed, and a gas inlet leading to said secondary passageway; said secondary passageway being open to said gas inlet by said valve when said valve is in said first position at low fuel flow pressure whereby liquid fuel emerging from said primary passageway is atomized by contact with said gas emerging from said secondary passageway; and said secondary passageway being closed to said gas inlet but open to the passage of additional liquid fuel by said valve when said valve is in said second position at increased fuel flow pressure.
Claim 2
Dependent Claim
175 words
A tubular liquid fuel nozzle having a tubular primary fuel passageway mounted in coaxial arrangement in said fuel nozzle, a tubular valve telescopically mounted on the inner portion of said tubular primary fuel passageway and movable by fuel flow pressure between a first position at low fuel flow pressure and a second position at increased fuel flow pressure, said valve having a reduced inner portion of smaller diameter than the inside diameter of said reduced portion of said fuel nozzle whereby a secondary passageway is formed, and a gas inlet leading to said secondary passageway; said secondary passageway being open to said gas inlet by said valve when said valve is in said first position at low fuel flow pressure whereby liquid fuel emerging from said primary passageway is atomized by contact with said gas emerging from said secondary passageway; and said secondary passageway being closed to said gas inlet but open to the passage of additional liquid fuel by said valve when said valve is in said second position at increased fuel flow pressure.
Claim 3
Dependent Claim
17 words
A nozzle according to claim 1, including means for swirling liquid fuel passing through said primary passageway.
Claim 4
Dependent Claim
17 words
A nozzle according to claim 1, including means for swirling liquid fuel passing through said secondary passageway.
Claim 5
Dependent Claim
19 words
A nozzle according to claim 1, including means for swirling liquid fuel passing through said primary and secondary passageways.
Claim 6
Dependent Claim
11 words
A nozzle according to claim 1, wherein said gas is air.
Claim 7
Dependent Claim
11 words
A nozzle according to claim 1, wherein said valve is spring-loaded.
Claim 8
Dependent Claim
25 words
A nozzle according to claim 1, said nozzle having a reduced inner portion adapted to be mounted in the burner wall of a combustion chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |