Title:
EXHAUST SYSTEM
Document Type and Number:
WIPO Patent Application WO/2001/042631
Kind Code:
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.
Inventors:
JOHANSSON CLAES-GOERAN (SE)
AABOM MATS (SE)
AABOM MATS (SE)
Application Number:
PCT/SE2000/002461
Publication Date:
June 14, 2001
Filing Date:
December 07, 2000
Export Citation:
Assignee:
ABB AB (SE)
JOHANSSON CLAES GOERAN (SE)
AABOM MATS (SE)
JOHANSSON CLAES GOERAN (SE)
AABOM MATS (SE)
International Classes:
F01N1/04; F01N1/24; F02C7/24; (IPC1-7): F01N1/04
Domestic Patent References:
| WO1999035378A1 | 1999-07-15 |
Foreign References:
| US3602333A | 1971-08-31 | |||
| US4753319A | 1988-06-28 | |||
| US3726359A | 1973-04-10 | |||
| DE2510611A1 | 1976-09-23 | |||
| US3739872A | 1973-06-19 |
Attorney, Agent or Firm:
Karlsson, Leif (L.A. Groth & Co. KB Box 6107 Stockholm, SE)
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Claims:
CLAIMS
| 1. | A soundabsorbing channel element having large crosssectional dimen sions (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 partchannels (7) running in the direction of flow, each part channel being provided with soundabsorbing means (8), and at least some of the partchannels (7) being of different lengths and comprising soundabsorbing means tuned for different frequencies. |
| 2. | A channel element as claimed in claim 1, characterized in that it is com posed of a plurality of channel element modules, each forming one or more part channels or part of a partchannel. |
| 3. | A channel element as claimed in either of claims 1 or 2, characterized in that the partchannels (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 15, 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 16, 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 di rection of flow, which first and second angles are different. |
| 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 18, characterized in that at least some of said soundabsorbing means (8) comprise both resistive (12) and reactive (10) soundabsorbing means. |
| 10. | A channel element as claimed in claim 9, characterized in that the reac tive soundabsorbing means is a resonator (10). |
| 11. | A channel element as claimed in claim 10, characterized in that the resonator is a quarterwave resonator (10). |
| 12. | A channel element as claimed in claim 11, characterized in that the soundabsorbing means (8) comprises a partition wall (11) separating a passage (9) through the partchannel (7) from a side chamber (10) in the partchannel, 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) com prises a layer (12) of soundabsorbing 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 113, 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 113, characterized in that the set comprises mod ules of different lengths but having substantially the said crosssectional dimen sions. |
| 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 flow direction of the gas, characterized in that the channel comprises a plurality of channel elements (1) as claimed in any one of claims 113. |
| 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 chan nel 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 113, 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 chan nel is composed of a plurality of channel elements of the type claimed in any one of claims 115. |
| 21. | The use of channel elements as claimed in any one of claims 114 for soundabsorption in a gas outlet channel of the type claimed in any one of claims 1618. |