Patent US3721387A successfully refreshed from Google Patents.
US3721387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ejector with variable mixing section and primary nozzle areas
Assignee: RTX Corp
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Filing: 1971-06-02
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Granted: 1973-03-20
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Expires: 1991-06-02
Abstract
Abstract The effectiveness of a jet pump is increased over a wide range of operating pressures by varying the areas of the primary nozzle and mixing chamber so that the ratio of the two is held at a substantially constant value by a plug designed such that the ratio of any cross-sectional areas of two spaced stations of the mixing chamber along the longitudinal axis of the plug is also substantially constant for each position of the primary nozzle.
Inventors
- 👤 G Wilmot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:02
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/44; F04F5/46; F04F5/461; B; B01; B01F; B01F25/00; B01F25/30; B01F25/31; B01F25/312; B01F25/3124; B01F25/31242; B01F25/3125; B01F25/31251; B01F25/312511
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
An ejector having a primary nozzle and a secondary nozzle disposed in a duct, an elongated moVable plug disposed in said duct immediately downstream of said primary and secondary nozzles defining with said duct an annular mixing chamber, means for positioning said elongated movable plug relative to said primary nozzle for changing the area of said primary nozzle, said plug being dimensioned such that the ratio of the area of said mixing chamber to the area of said primary nozzle remain substantially constant and the ratio of cross-sectional areas of any two stations along the longitudinal axis of said plug also remains substantially constant.
Claim 2
Dependent Claim
104 words
An ejector having a primary nozzle and a secondary nozzle disposed in a duct, an elongated moVable plug disposed in said duct immediately downstream of said primary and secondary nozzles defining with said duct an annular mixing chamber, means for positioning said elongated movable plug relative to said primary nozzle for changing the area of said primary nozzle, said plug being dimensioned such that the ratio of the area of said mixing chamber to the area of said primary nozzle remain substantially constant and the ratio of cross-sectional areas of any two stations along the longitudinal axis of said plug also remains substantially constant.
Claim 3
Dependent Claim
32 words
An ejector as claimed in claim 1 including an elongated fixed plug disposed in said duct in axial alignment with said elongated movable plug and defining with said duct a diffuser nozzle.
Claim 4
Dependent Claim
28 words
An ejector as claimed in claim 1 wherein said movable plug concomitantly changes the area of the primary nozzle and the longitudinal cross-sectional area of said mixing chamber.
Claim 5
Dependent Claim
159 words
An ejector disposed in a duct having a primary nozzle and a secondary nozzle, an elongated movable plug disposed in said duct immediately downstream of said primary and secondary nozzles defining with said duct an annular mixing chamber and having one end portion movable into and out of the exit opening of the primary nozzle, means for positioning said elongated movable plug relative to said primary nozzle for varying the opening of said primary nozzle to a full open and full closed position, said plug being conically-like dimensioned such that the ratio of the area of said mixing chamber to the area of said primary nozzle remain substantially constant and the ratio of cross-sectional areas of any two stations along the longitudinal axis of said plug also remains substantially constant, the space between said elongated movable plug and said duct being wider adjacent the primary nozzle and fairing to a narrower space at the opposite end of said plug.
Claim 6
Dependent Claim
159 words
An ejector disposed in a duct having a primary nozzle and a secondary nozzle, an elongated movable plug disposed in said duct immediately downstream of said primary and secondary nozzles defining with said duct an annular mixing chamber and having one end portion movable into and out of the exit opening of the primary nozzle, means for positioning said elongated movable plug relative to said primary nozzle for varying the opening of said primary nozzle to a full open and full closed position, said plug being conically-like dimensioned such that the ratio of the area of said mixing chamber to the area of said primary nozzle remain substantially constant and the ratio of cross-sectional areas of any two stations along the longitudinal axis of said plug also remains substantially constant, the space between said elongated movable plug and said duct being wider adjacent the primary nozzle and fairing to a narrower space at the opposite end of said plug.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |