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WO2001042631A1 - Exhaust system - Google Patents

Exhaust system

Info

Publication number
WO2001042631A1
WO2001042631A1 PCT/SE2000/002461 SE0002461W WO2001042631A1 WO 2001042631 A1 WO2001042631 A1 WO 2001042631A1 SE 0002461 W SE0002461 W SE 0002461W WO 2001042631 A1 WO2001042631 A1 WO 2001042631A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
channel
element
characterized
sound
outlet
Prior art date
Application number
PCT/SE2000/002461
Other languages
French (fr)
Inventor
Claes-Göran Johansson
Mats ÅBOM
Original Assignee
Abb Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/24Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/02Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/04Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/24Heat or noise insulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00Structure, disposition or shape of gas-chambers
    • F01N2490/20Chambers being formed inside the exhaust pipe without enlargement of the cross section of the pipe, e.g. resonance chambers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00Function
    • F05D2260/96Preventing, counteracting or reducing vibration or noise

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

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
PCT/SE2000/002461 1999-12-09 2000-12-07 Exhaust system WO2001042631A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE9904504 1999-12-09
SE9904504-9 1999-12-09

Publications (1)

Publication Number Publication Date
WO2001042631A1 true true WO2001042631A1 (en) 2001-06-14

Family

ID=20418059

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2000/002461 WO2001042631A1 (en) 1999-12-09 2000-12-07 Exhaust system

Country Status (1)

Country Link
WO (1) WO2001042631A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3602333A (en) * 1969-10-15 1971-08-31 Chiyoda Chem Eng Construct Co Silencer for suction or discharge of fluids under pressure
US3726359A (en) * 1970-04-22 1973-04-10 Isobertech Grassmann H Muffler for flowing gases
US3739872A (en) * 1971-05-27 1973-06-19 Westinghouse Electric Corp Gas turbine exhaust system
DE2510611A1 (en) * 1975-03-11 1976-09-23 Kraftwerk Union Ag Gas turbine exhaust silencer absorbing low-frequency noise - silencer has perforated plates, rock wool filling and staggered guide vanes
US4753319A (en) * 1985-10-16 1988-06-28 Nuovopignone S.P.A. Exhaust silencer for high-power gas turbines
WO1999035378A1 (en) * 1997-12-30 1999-07-15 Silentor Notox A/S A silencer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3602333A (en) * 1969-10-15 1971-08-31 Chiyoda Chem Eng Construct Co Silencer for suction or discharge of fluids under pressure
US3726359A (en) * 1970-04-22 1973-04-10 Isobertech Grassmann H Muffler for flowing gases
US3739872A (en) * 1971-05-27 1973-06-19 Westinghouse Electric Corp Gas turbine exhaust system
DE2510611A1 (en) * 1975-03-11 1976-09-23 Kraftwerk Union Ag Gas turbine exhaust silencer absorbing low-frequency noise - silencer has perforated plates, rock wool filling and staggered guide vanes
US4753319A (en) * 1985-10-16 1988-06-28 Nuovopignone S.P.A. Exhaust silencer for high-power gas turbines
WO1999035378A1 (en) * 1997-12-30 1999-07-15 Silentor Notox A/S A silencer

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