US4150732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonant cavity devices for reducing noise within a duct in the presence of a gaseous fluid
Assignee: Safran Aircraft Engines SAS
•
Filing: 1978-01-03
•
Granted: 1979-04-24
•
Expires: 1998-01-03
Abstract
Abstract A sound insulation chamber delimits a gaseous flow channel and including onant cavities housed within a double wall. The cavity vents are ducts which open into the channel flush with the inner wall and project into the interior of the cavities.
Inventors
- 👤 Rene G. Hoch
- 👤 Bernard J. L. Jubelin
- 👤 Pierre M. A. Sarlat
- 👤 Pierre Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:33
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/02; F16L55/033; F02; F02C; F02C7/00; F02C7/24; G; G10; G10K; G10K11/00; G10K11/16; G10K11/172; F05; F05D; F05D2260/00; F05D2260/96
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
159 words
A chamber for attenuating the acoustical energy propagating within a channel traversed by a gaseoue flow, comprising two substantially coaxial shells, wherein the inner wall of the inner shell delimits the flow channel, the space between the two shells being divided by partitions which separate independent annular cavities each of which communicates with the channel through at least one opening provided in the inner shell, and said cavities thus forming annular acoustic resonators which attenuate, in a given frequency range, the acoustical energy propagating in the channel, said chamber being characterized by the fact that each opening opens into the corresponding cavity through a bent duct having two angularly related branches which extend into the interior of said cavity, one of said branches being joined to the inner shell and opening into the channel flush with said inner wall, and the other of its branches extending substantially parallel to the axis of the channel and opening into said cavities.
Claim 2
Dependent Claim
159 words
A chamber for attenuating the acoustical energy propagating within a channel traversed by a gaseoue flow, comprising two substantially coaxial shells, wherein the inner wall of the inner shell delimits the flow channel, the space between the two shells being divided by partitions which separate independent annular cavities each of which communicates with the channel through at least one opening provided in the inner shell, and said cavities thus forming annular acoustic resonators which attenuate, in a given frequency range, the acoustical energy propagating in the channel, said chamber being characterized by the fact that each opening opens into the corresponding cavity through a bent duct having two angularly related branches which extend into the interior of said cavity, one of said branches being joined to the inner shell and opening into the channel flush with said inner wall, and the other of its branches extending substantially parallel to the axis of the channel and opening into said cavities.
Claim 3
Dependent Claim
56 words
A chamber according to claim 1, characterized by the fact that the partitions which separate the cavities are arranged transverse to the direction of gas flow, that the openings consist of slits provided in the inner shell and substantially parallel to said partitions, and that the ducts are bounded within the cavities by pairs of lips.
Claim 4
Dependent Claim
23 words
A chamber according to claim 2, characterized by the fact that the two lips that bound each duct are parallel to each other.
Claim 5
Dependent Claim
52 words
A chamber according to claim 2, characterized by the fact that the two lips that bound each duct are inclined with respect to each other in such a fashion that the cross-sectional area of the duct is larger at the level of the inner shell than at its exit into the cavity.
Claim 6
Dependent Claim
34 words
A chamber according to claim 3, characterized by the fact that at least one portion of one of the lips of at least one pair of lips consists of a portion of a partition.
Claim 7
Dependent Claim
36 words
A chamber according to claim 5, characterized by the fact that at least a portion of the surface of at least one of the individual lips of the partitions is perforated by a multiplicity of openings.
Claim 8
Dependent Claim
25 words
A chamber according to claim 3, characterized by the fact that both lips of at least one pair of lips are distinct from the partitions.
Claim 9
Dependent Claim
35 words
A chamber according to claim 3, characterized by the fact that at least a portion of one of the lips of at least one pair of lips consists of a portion of the inner shell.
Claim 10
Dependent Claim
35 words
A chamber according to claim 3, characterized by the fact that at least one portion of one of the lips of at least one pair of lips consists of a portion of the outer shell.
Claim 11
Dependent Claim
38 words
A chamber according to claim 9, characterized by the fact that at least one supplementary partition joining at least one lip distinct from the outer shell to the inner shell delimits a secondary cavity within the corresponding cavity.
Claim 12
Dependent Claim
30 words
A chamber according to claim 10, characterized by the fact that the secondary cavity communicates with the flow channel through openings provided in the inner shell portion which bounds it.
Claim 13
Dependent Claim
29 words
A chamber according to claim 10, characterized by the fact that the secondary cavity communicates with the adjacent duct through apertures provided in the lip section which bounds it.
Claim 14
Dependent Claim
23 words
A chamber according to claim 3, characterized by the fact that at least one slit is partially closed off by a perforated strip.
Claim 15
Dependent Claim
34 words
A chamber according to claim 1, characterized by the fact that at least one annular cavity is divided into at least two sectoral cavities by at least two partitions aligned transverse to its walls.
References Cited (Backward Citations)
DE904984C
Cited
US2765044A
Cited
GB858049A
Cited
FR1235540A
Cited
FR1307183A
Cited
FR1372478A
Cited
US3269484A
Cited
US3437173A
Cited
DK131432A
Cited
US3819009A
Cited
US3819007A
Cited
US4100993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |