US3990834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooled igniter
Assignee: General Electric Co
•
Filing: 1973-09-17
•
Granted: 1976-11-09
•
Expires: 1993-09-17
Abstract
Abstract A combustion chamber is provided with a fuel source and an igniter for initiating combustion. The igniter projects into the combustion chamber and into proximity with the fuel source. A heated tip portion of the igniter initiates burning and is cooled by means of cooling air passing through a plurality of air passages defined by a plurality of channels near the external surface of the igniter housing and further defined by a surrounding ferrule. Certain of the channels extend axially of the housing while at least one channel extends circumferentially thereabout and intersects the former channels. An opening in the ferrule provides communication between preselected of the channels and the interior of the combustion chamber. Cooling air passes through the channels in the axial direction (relative to the igniter) and is collected by the circumferential channel whereupon it is exhausted through the ferrule opening generally normally to the igniter housing and toward the downstream direction therefrom within the chamber.
Inventors
- 👤 Thomas L. DuBell
- 👤 Thomas C. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:06
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26; F02C7/264; F02C7/266; F02C7/12; F02C7/16; F02C7/18; F05; F05D; F05D2260/00; F05D2260/20; F23; F23R; F23R2900/00; F23R2900/00012; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
In a fuel igniter for use in a combustion chamber, the igniter comprising a cylindrical housing projecting generally radially into the combustion chamber, the housing terminating in a heated tip extending through a generally annular ferrule, the improvement comprising: a plurality of first channels spaced circumferentially about the outer surface of said housing and aligned generally axially thereof; a circumferential second channel formed within the outer surface of said housing proximate said heated tip and intersecting preselected of said first channels; first means for providing a flow of cooling air to said first channels; second means for collecting said cooling air within said second channel; and third means for exhausting said cooling air from said second channel generally normally of said housing and substantially only in a direction downstream thereof into said combustion chamber.
Claim 2
Dependent Claim
134 words
In a fuel igniter for use in a combustion chamber, the igniter comprising a cylindrical housing projecting generally radially into the combustion chamber, the housing terminating in a heated tip extending through a generally annular ferrule, the improvement comprising: a plurality of first channels spaced circumferentially about the outer surface of said housing and aligned generally axially thereof; a circumferential second channel formed within the outer surface of said housing proximate said heated tip and intersecting preselected of said first channels; first means for providing a flow of cooling air to said first channels; second means for collecting said cooling air within said second channel; and third means for exhausting said cooling air from said second channel generally normally of said housing and substantially only in a direction downstream thereof into said combustion chamber.
Claim 3
Dependent Claim
49 words
The improvement of claim 1 wherein: preselected of said first channels originate at a point of said housing proximate the radially outermost extremity of said ferrule, and said second channel is disposed substantially within said ferrule, said first and second channels combining with said ferrule to define air passages.
Claim 4
Dependent Claim
27 words
The improvement of claim 2 wherein said third means comprises an opening in said ferrule providing communication between preselected of said air passages and said combustion chamber.
Claim 5
Dependent Claim
28 words
The improvement of claim 3 wherein said opening is generally radial with respect to said housing, and is disposed to the downstream side thereof within the combustion chamber.
Claim 6
Dependent Claim
64 words
A fuel igniter for use in combustion chambers, the igniter comprising: an elongated housing extending generally radially from a point outside the chamber to a point within the chamber; a heated tip proximate the extremity of the housing radially innermost of the chamber; a ferrule of predetermined length surrounding a portion of said housing near said tip and receiving said housing in frictional engagement;
Claim 7
Dependent Claim
64 words
A fuel igniter for use in combustion chambers, the igniter comprising: an elongated housing extending generally radially from a point outside the chamber to a point within the chamber; a heated tip proximate the extremity of the housing radially innermost of the chamber; a ferrule of predetermined length surrounding a portion of said housing near said tip and receiving said housing in frictional engagement;
Claim 8
Dependent Claim
78 words
a plurality of axial channels generally parallel to one another and spaced circumferentially of said housing for passing cooling air along the external surface of said housing axially thereof within said ferrule; a circumferential channel formed within and circumscribing said housing for collecting said cooling air within said ferrule near said tip; and means for expelling said cooling air into said combustion chamber substantially only in a direction downstream of said tip and generally normally to said housing.
Claim 9
Dependent Claim
78 words
a plurality of axial channels generally parallel to one another and spaced circumferentially of said housing for passing cooling air along the external surface of said housing axially thereof within said ferrule; a circumferential channel formed within and circumscribing said housing for collecting said cooling air within said ferrule near said tip; and means for expelling said cooling air into said combustion chamber substantially only in a direction downstream of said tip and generally normally to said housing.
Claim 10
Dependent Claim
28 words
The igniter of claim 5 wherein said expelling means comprises an opening in said ferrule disposed toward the downstream portion thereof and directed generally normally to the housing.
Claim 11
Dependent Claim
67 words
The igniter of claim 6 wherein: said ferrule is generally cylindrical and is annular in the cross section and has a generally planar extremity radially inward of the combustion chamber, and wherein said opening comprises an indentation in said inward extremity at the downstream portion thereof, said indentation exposing a portion of said circumferential channel and portions of preselected of said axial channels to the chamber interior.
References Cited (Backward Citations)
US2693082A
Cited
US2865441A
Cited
US2840742A
Cited
US2831993A
Cited
FR1239216A
Cited
US3057159A
Cited
GB875342A
Cited
US3330985A
Cited
US3736748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |