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Publication numberWO2001042631 A1
Publication typeApplication
Application numberPCT/SE2000/002461
Publication date14 Jun 2001
Filing date7 Dec 2000
Priority date9 Dec 1999
Publication numberPCT/2000/2461, PCT/SE/0/002461, PCT/SE/0/02461, PCT/SE/2000/002461, PCT/SE/2000/02461, PCT/SE0/002461, PCT/SE0/02461, PCT/SE0002461, PCT/SE002461, PCT/SE2000/002461, PCT/SE2000/02461, PCT/SE2000002461, PCT/SE200002461, WO 0142631 A1, WO 0142631A1, WO 2001/042631 A1, WO 2001042631 A1, WO 2001042631A1, WO-A1-0142631, WO-A1-2001042631, WO0142631 A1, WO0142631A1, WO2001/042631A1, WO2001042631 A1, WO2001042631A1
InventorsClaes-Göran Johansson, Mats ÅBOM
ApplicantAbb Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: Patentscope, Espacenet
Exhaust system
WO 2001042631 A1
Abstract
The present invention relates to a sound-absorbing channel element for a flowing medium. The channel element (1) has an inlet (2) connected to a sound source and an outlet (3), and is defined by outer walls (4) extending in the flow direction. In order to achieve simplified construction of sound-absorbers in a gas outlet channel, as well as greater efficiency and lower resistance, the channel element (1) in accordance with the invention is provided with partition walls (5, 6) running in the direction of flow. These divide the channel element (1) into several part-channels (7). Each part-channel (7) is provided with sound-absorbing members (8). The channels are of different lengths. The invention also relates to a set of channel element modules for modularised construction of such a channel element, and also a gas outlet channel where equivalent principles are applied. Finally, the invention relates to a method of manufacturing such a channel element, wherein this is composed of a set of channel element modules, and a method of suppressing the sound in a gas outlet channel wherein the channels are divided into part-channels in corresponding manner.
Claims  (OCR text may contain errors)
1. A sound-absorbing channel element having large cross-sectional dimensions (1 ; 101 , 102; 201) for a flowing medium, and having an inlet (2) connected to a sound source (15) and an outlet (3), which channel element is defined by outer walls (4) extending in the flow direction, characterized in that the channel element is divided into part-channels (7) running in the direction of flow, each part- channel being provided with sound-absorbing means (8), and at least some of the part-channels (7) being of different lengths and comprising sound-absorbing means tuned for different frequencies.
2. A channel element as claimed in claim 1 , characterized in that it is composed of a plurality of channel element modules, each forming one or more part- channels or part of a part-channel.
3. A channel element as claimed in either of claims 1 or 2, characterized in that the part-channels (7) are constructed from a plurality of pipes (56') running in the direction of flow.
4. A channel element as claimed in either of claims 1 or 2, characterized in that said part channels are constructed from at least one partition wall (5) running in a first direction transverse to the direction of flow.
5. A channel element as claimed in either of claims 1 or 2, characterized in that said part channels are constructed from at least one partition wall (5) running in a first transverse direction and at least one second partition wall (6) running in a second transverse direction to the direction of flow.
6. A channel element as claimed in any one of claims 1-5, characterized in that the part channels (7, 7') are constructed from partition walls (56, 5') that are rigidly joined to the outer walls (4) of the channel element.
7. A channel element as claimed in any one of claims 1-6, characterized in that said inlet (2) is located in a plane forming a first angle to the direction of flow and in that said outlet is located in a plane forming a second angle (3) to the direction of flow, which first and second angles are different. 13
8. A channel element as claimed in claim 7, characterized in that one of said angles is a right angle and the other is 67.5°.
9. A channel element as claimed in any one of claims 1-8, characterized in that at least some of said sound-absorbing means (8) comprise both resistive (12) and reactive (10) sound-absorbing means.
10. A channel element as claimed in claim 9, characterized in that the reactive sound-absorbing means is a resonator (10).
11. A channel element as claimed in claim 10, characterized in that the resonator is a quarter-wave resonator (10).
12. A channel element as claimed in claim 11 , characterized in that the sound-absorbing means (8) comprises a partition wall (11) separating a passage (9) through the part-channel (7) from a side chamber (10) in the part-channel, which side chamber (10) is connected to the passage (9) through the opening member (13) comprising at least one opening, and which partition wall (11) comprises a layer (12) of sound-absorbing material on at least the side of the partition wall (11) facing the passage (9).
13. A channel element as claimed in claim 12, characterized in that the opening member (13) has an area in the same order of magnitude as the through- flow area of the passage (9).
14. A set of channel elements in which each channel element consists of a channel element as claimed in any one of claims 1-13, characterized in that each channel element has an inlet and/or an outlet that is complementary with an outlet and/or inlet, respectively, of another channel element in the set.
15. A set of channel elements for use in a channel element of the type claimed in any one of claims 1-13, characterized in that the set comprises modules of different lengths but having substantially the said cross-sectional dimensions.
16. A gas outlet channel having an inlet (14) connected to a sound source (15) and an outlet (16), which channel is defined by outer walls extending in the 14
flow direction of the gas, characterized in that the channel comprises a plurality of channel elements (1) as claimed in any one of claims 1-13.
17. A gas outlet channel as claimed in claim 16, characterized in that the channel elements (1) constitute a set of the type claimed in claim 14.
18. A gas outlet channel as claimed in either of claims 16 or 17, which channel comprises a bend (18), characterized in that at least one (1b, 1c) of the channel elements is arranged in the bend (18).
19. A method of manufacturing a channel element as claimed in any one of claims 1-13, characterized in that the channel element is composed of a set of channel element modules of the type claimed in claim 15.
20. A method of suppressing the sound in a gas outlet channel having an inlet connected to a sound source and an outlet, which channel is defined by outer walls extending in the direction of flow of the gas, characterized in that the channel is composed of a plurality of channel elements of the type claimed in any one of claims 1-15.
21. The use of channel elements as claimed in any one of claims 1-14 for sound-absorption in a gas outlet channel of the type claimed in any one of claims
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
WO1999035378A1 *30 Dec 199815 Jul 1999Silentor Notox A/SA silencer
DE2510611A1 *11 Mar 197523 Sep 1976Kraftwerk Union AgGas turbine exhaust silencer absorbing low-frequency noise - silencer has perforated plates, rock wool filling and staggered guide vanes
US3602333 *15 Oct 196931 Aug 1971Chiyoda Chem Eng Construct CoSilencer for suction or discharge of fluids under pressure
US3726359 *21 Apr 197110 Apr 1973Isobertech Grassmann HMuffler for flowing gases
US3739872 *27 May 197119 Jun 1973Westinghouse Electric CorpGas turbine exhaust system
US4753319 *14 Oct 198628 Jun 1988Nuovopignone S.P.A.Exhaust silencer for high-power gas turbines
Classifications
International ClassificationF02C7/24, F01N1/04, F01N1/24
Cooperative ClassificationF01N2490/20, F01N1/04, F01N1/24, F02C7/24, F05D2260/96
European ClassificationF01N1/04, F02C7/24, F01N1/24
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