US3910375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet engine silencer
Assignee: Bertin Technologies SAS
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Filing: 1974-08-19
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Granted: 1975-10-07
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Expires: 1994-08-19
Abstract
Abstract In and for a jet propulsion engine having a thrust nozzle adapted to exhaust a propulsive gas jet, said nozzle including wall means longitudinally bounding a hollow central body substantially coaxial with said nozzle, a silencer device for reducing the noise produced by said gas jet, said silencer device comprising means for supplying the inside of said hollow central body with air, and at least one orifice formed in said wall means and through which air from the inside of said hollow central body can discharge into the gas jet exhausting from said thrust nozzle, wherein the improvement comprises, hingedly connected to the central body, at least one adjustable obturating flap movable between a first position wherein it unmasks said orifice and a second position wherein it masks the same and restores a substantially unbroken surface to the longitudinal wall of the central body.
Inventors
- 👤 Jean Georges Edouard Jos Hache
- 👤 Jean-Pierre Achille Allioud
- 👤 Claude Charles Doyotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:50
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/38; F02K1/383
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
In and for a jet propulsion engine having a thrust nozzle adapted to exhaust a propulsive gas jet, said nozzle including wall means longitudinally bounding a hollow central body substantially coaxial with said nozzle, a silencer device for reducing the noise produced by said gas jet, said silencer device comprising means for supplying the inside of said hollow central body with air, and at least one orifice formed in said wall means and through which air from the inside of said hollow central body can discharge into the gas jet exhausting from said thrust nozzle, wherein the improvement comprises, hingedly connected to the central body, at least one adjustable obturating flap movable between a first position wherein it unmasks said orifice and a second position wherein it masks the same and restores a substantially unbroken surface to the longitudinal wall of the central body.
Claim 2
Dependent Claim
144 words
In and for a jet propulsion engine having a thrust nozzle adapted to exhaust a propulsive gas jet, said nozzle including wall means longitudinally bounding a hollow central body substantially coaxial with said nozzle, a silencer device for reducing the noise produced by said gas jet, said silencer device comprising means for supplying the inside of said hollow central body with air, and at least one orifice formed in said wall means and through which air from the inside of said hollow central body can discharge into the gas jet exhausting from said thrust nozzle, wherein the improvement comprises, hingedly connected to the central body, at least one adjustable obturating flap movable between a first position wherein it unmasks said orifice and a second position wherein it masks the same and restores a substantially unbroken surface to the longitudinal wall of the central body.
Claim 3
Dependent Claim
54 words
A silencer device according to claim 1, wherein the flap comprises a hollow body having an open upstream end which always lies inside said central body, and a likewise open downstream end which when said orifice is masked lies inside the central body and when said orifice is unmasked projects into the gas jet.
Claim 4
Dependent Claim
39 words
A silencer device according to claim 1, further comprising an adjustable deflecting member in the shape of a dihedron projecting into the gas jet with its edge extending substantially transversely to the nozzle axis when said orifice is unmasked.
Claim 5
Dependent Claim
30 words
A silencer device according to claim 1, wherein the flap is hingedly connected to the central body about a hinge line having a component substantially parallel to the nozzle axis.
Claim 6
Dependent Claim
20 words
A silencer device according to claim 1, wherein the nozzle comprises a discharge edge situated upstream of the said orifice.
Claim 7
Dependent Claim
50 words
A silencer device according to claim 5, further comprising an auxiliary fairing coaxial with the nozzle, said fairing being disposed at least partly downStream of the said discharge edge and having an upstream diameter greater than the largest dimension of the downstream portion of a cowling containing the jet engine.
Claim 8
Dependent Claim
54 words
A silencer device according to claim 6, further comprising means for moving said auxiliary fairing in a direction parallel to the nozzle axis, between an extended postion in which the auxiliary fairing functions as an exhaust diffuser around the said gas jet and a retracted position in which it surrounds the said engine cowling.
Claim 9
Dependent Claim
30 words
A silencer device according to claim 1, wherein the means for supplying the inside of the hollow central body with air comprise an ejector fed with a pressurized inducing fluid.
Claim 10
Dependent Claim
44 words
A silencer device according to claim 1, in and for a jet propulsion engine having an multistage compressor, wherein the means for supplying the inside of the hollow central body with air include at least one passageway originating between two stages of said compressor.
Claim 11
Dependent Claim
52 words
A silencer device according to claim 1, in and for a jet propulsion engine of the dual-flow type, namely a heated gas flow and an unheated air flow, wherein the means for supplying the inside of the hollow central body with air comprise means for drawing air from said unheated air flow.
References Cited (Backward Citations)
US2987879A
Cited
US3133412A
Cited
US3372876A
Cited
US3422624A
Cited
US3575261A
Cited
US3780827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |