Patent US5268541A successfully refreshed from Google Patents.
US5268541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound attenuator for low frequencies, in particular for air ducts in paper mills
Assignee: Valmet Technologies Oy
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Filing: 1992-01-13
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Granted: 1993-12-07
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Expires: 2012-01-13
Abstract
Abstract The inventions concerns a sound attenuator for low frequencies for air-conditioning ducts, in particular for intake-air and/or exhaust-air ducts in paper mills. The sound attenuator comprises a frame whose flow duct substantially coincides with the air-conditioning duct and in which frame there is at least one plane attenuator member parallel to the flow direction and comprising one or several attenuator units operating by the Helmholtz and/or plate resonator principle. The attenuator member or members are fitted in the frame singly or as a group of several attenuator members to be replaced for cleaning and/or servicing of the sound attenuator and/or of the attenuator members.
Inventors
- 👤 Henrik Pettersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:36
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/24; F16; F16L; F16L55/00; F16L55/02; F16L55/033; F16L55/0336
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
171 words
A sound attenuator for low frequencies for air-conditioning ducts, comprising a frame, said frame having a flow duct arranged such that it can substantially coincide with an air-conditioning duct, said frame further comprising at least one attenuator member having a top and bottom edge, and a planar face arranged such that it will be parallel to the flow direction of air when arranged in the air-conditioning duct, said at least one attenuator member comprising one or several attenuator units structured to operate by the Helmholtz and/or plate resonator principle, said at least one attenuator member being located in said frame singly or as a group of several attenuator members, and means for removing said at least one attenuator member for cleaning and/or servicing of said sound attenuator, said means comprising horizontal rails, said at least one attentuator member being supported by said top and bottom edges on said horizontal rails and being arranged such that it is removable from said frame along said horizontal rails either completely or at least partly.
Claim 2
Dependent Claim
171 words
A sound attenuator for low frequencies for air-conditioning ducts, comprising a frame, said frame having a flow duct arranged such that it can substantially coincide with an air-conditioning duct, said frame further comprising at least one attenuator member having a top and bottom edge, and a planar face arranged such that it will be parallel to the flow direction of air when arranged in the air-conditioning duct, said at least one attenuator member comprising one or several attenuator units structured to operate by the Helmholtz and/or plate resonator principle, said at least one attenuator member being located in said frame singly or as a group of several attenuator members, and means for removing said at least one attenuator member for cleaning and/or servicing of said sound attenuator, said means comprising horizontal rails, said at least one attentuator member being supported by said top and bottom edges on said horizontal rails and being arranged such that it is removable from said frame along said horizontal rails either completely or at least partly.
Claim 3
Dependent Claim
45 words
The sound attenuator of claim 1, wherein said frame has a substantially circular sectional shape, such that when said frame is arranged in the air-conditioning duct, said circular section is arranged in a direction perpendicular to the flow direction of air in said air-conditioning duct.
Claim 4
Dependent Claim
45 words
The sound attenuator of claim 1, wherein said frame has a substantially rectangular sectional shape, such that when said frame is arranged in the air-conditioning duct, said rectangular section is arranged in a direction perpendicular to the flow direction of air in said air-conditioning duct.
Claim 5
Dependent Claim
99 words
The sound attenuator of claim 1, comprising a plurality of attenuator members, wherein said frame has a substantially polygonal shape, such that when said frame is arranged in the air-conditioning duct, said polygon section is arranged in a direction perpendicular to the flow direction of air in said air-conditioning duct, said attenuator members being fitted in said frame substantially in the shape of a polygon that the principal shape of the polygon consisting of the attenuator members coincides with the sectional shape of said frame in a direction perpendicular to the flow direction fo air in said air-conditioning duct.
Claim 6
Dependent Claim
28 words
The sound attenuator of claim 1, comprising a plurality of attenuator members, wherein at least one of said attenuator members comprises a structure based on absorptive sound attenuation.
Claim 7
Dependent Claim
19 words
The sound attenuator of claim 1 which is arranged in an intake-air and/or exhaust duct in a paper mill.
Claim 8
Dependent Claim
21 words
The sound attenuator of claim 1, wherein at least one of said attenuator units is structured based on absorptive sound attenuation.
Claim 9
Dependent Claim
163 words
An arrangement for providing sound attenuation in an air duct, comprising a sound attenuator having a flow duct, said sound attenuator having a frame arranged in said air duct such that flow of air through said flow duct substantially coincides with flow of air through said air duct, an attenuator member arranged in said frame, said attenuator member having a top and bottom edge, and a planar face arranged such that it will be parallel to the flow direction of air in said flow duct, said attenuator member comprising one or several attenuator units structured to operate by the Helmholtz and/or plate resonator principle, and means for removing said at least one attenuator member for cleaning and/or servicing of said sound attenuator, said means comprising horizontal rails, said attenuator member being supported by said top and bottom edges on said horizontal rails and being arranged such that is ti removable from said frame along said horizontal rails either completely or at least partly.
Claim 10
Dependent Claim
163 words
An arrangement for providing sound attenuation in an air duct, comprising a sound attenuator having a flow duct, said sound attenuator having a frame arranged in said air duct such that flow of air through said flow duct substantially coincides with flow of air through said air duct, an attenuator member arranged in said frame, said attenuator member having a top and bottom edge, and a planar face arranged such that it will be parallel to the flow direction of air in said flow duct, said attenuator member comprising one or several attenuator units structured to operate by the Helmholtz and/or plate resonator principle, and means for removing said at least one attenuator member for cleaning and/or servicing of said sound attenuator, said means comprising horizontal rails, said attenuator member being supported by said top and bottom edges on said horizontal rails and being arranged such that is ti removable from said frame along said horizontal rails either completely or at least partly.
Claim 11
Dependent Claim
51 words
The arrangement of claim 8, further comprising a second attenuator member arranged in said frame, said second attenuator member having a planar face arranged such that it will be parallel to the flow direction of air in said flow duct, said second attenuator member being structured based on absorptive sound attenuation.
Claim 12
Dependent Claim
38 words
The arrangement of claim 8, wherein said frame further comprises an outer wall, an inner wall located at a distance from said outer wall, and an absorption material located between said inner and outer walls for absorptive attention.
Claim 13
Dependent Claim
29 words
The arrangement of claim 8, wherein said frame has a substantially circular sectional shape arranged in a direction perpendicular to the flow direction of air in said air-conditioning duct.
Claim 14
Dependent Claim
29 words
The arrangement of claim 8, wherein said frame has a substantially rectangular sectional shape arranged in a direction perpendicular to the flow direction of air in said air-conditioning duct.
Claim 15
Dependent Claim
70 words
The arrangement of claim 8, comprising a plurality of attenuator members, wherein said frame has a substantially polygonal shape arranged in a direction perpendicular to the flow direction of air in said air-conditioning duct, said attenuator members being fitted in said frame substantially in the shape of a polygon so that the principal shape of the polygon consisting of the attenuator members coincides with the sectional shape of said frame.
Claim 16
Dependent Claim
23 words
The sound attenuator of claim 1, wherein said means comprises a handle attached to an end of said at least one attenuating member.
Claim 17
Dependent Claim
18 words
The sound attenuator of claim 5, wherein said plurality of attenuator members are placed into the sound attenuator.
Claim 18
Dependent Claim
15 words
The sound attentuator of claim 1, wherein said means are integrally connected to said frame.
Claim 19
Dependent Claim
15 words
The sound attentuator of claim 8, wherein said means are integrally connected to said frame.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |