EP1358398A1 - Schalldämpfer und abgassystem mit schalldämpfer - Google Patents
Schalldämpfer und abgassystem mit schalldämpferInfo
- Publication number
- EP1358398A1 EP1358398A1 EP02715931A EP02715931A EP1358398A1 EP 1358398 A1 EP1358398 A1 EP 1358398A1 EP 02715931 A EP02715931 A EP 02715931A EP 02715931 A EP02715931 A EP 02715931A EP 1358398 A1 EP1358398 A1 EP 1358398A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- partition wall
- silencer
- channels
- silencer according
- inlet
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
Definitions
- Silencer and exhaust gas system comprising a silencer
- the invention refers to a silencer according to the preamble of claim 1 and an exhaust gas system according to claim 15.
- Silencers are generally used to reduce emissions of sound from gas flows with pressure fluctuations.
- the emissions of sound are reduced according to known silencer technique in that resonance phenomenon in resonance chambers damps the oscillation modes of the gas within given frequency interval, by introducing turbulent flow paths which break laminar flow with pulsations and result in that the energy contained in the gas flow is spread from said oscillation modes to a wider energy spectrum.
- the sound is also reduced through that the silencer induces a fall of pressure of the gas flow. This fall of pressure give rise to energy losses and in case the silencer is used at a unit producing energy, the degree of efficiency of the unit decreases. In case the silencer is used at a combustion engine, the decrease in efficiency give rise to a larger environmental effect in the form of exhausts of carbon dioxide for the same amount of useful energy produced.
- the silencer's ability to reduce the acoustic pressure must be weighed against the fall of pressure that the silencer give rise to and thereby the amount of energy that the silencer consumes.
- An object of the invention is to provide a silencer with a low counter pressure and a good ability of silencing noise, which silencer is cheap to manufacture.
- a flow of sounds through a channel can be seen as a series of increases of pressure with intermediate decreases of pressure that passes after each other through the channel.
- the partition wall By forming the partition wall as a band which is folded to Z shape to a package which forms a set of inlet channels on one side of the partition wall and a set of outlet channels on the other side of the partition wall, an opposite directed flow is formed on opposite sides of the partition wall.
- the silencing effect can be further increased by damping the the movement of the partition wall with friction.
- the partition wall can be provided with perforations whereby pressure pulsations through the perforations can give rise to increased ability of silencing noise.
- the partition wall is provided between the inlet opening and the oulet opening in such a way that it extends between turning chambers arranged in connection with the side walls of the silencer, and is provided with a set of inlet channels which leads from the inlet opening to said turning chamber and a set of outlet channels which leads from from said turning chamber to the outlet opening, whereby the partition wall divides the flow in two opposite directed flow paths from the inlet opening via turning chambers and which flow paths meet at the outlet opening.
- This design give rise to a silencer where the opposite directed flow paths give rise to a very good noise reducing effect.
- each of the flow paths is characterized in that the flow moves in a forward and backward path with opposite directed flow on each side of the partition wall.
- FIG. 1 shows a manufacturing process for a silencer according to the invention
- Fig. 2 shows the silencer in detail, with an indication of the flow paths through the silencer
- Fig. 3 shows, in detail, surfaces of the partition wall according to an embodiment of the invention.
- Figure 1 shows the manufacturing of a silencer according to the invention.
- a partition wall lb comprised in the silencer is formed from a metal band la being formed by pressing, rolling or the like.
- the metal band is further formed in a pressing step between rollers where the metal band la on one hand is given a surface structure 20, which is shown in an enlarged view in Fig. 1, and on the other hand a set of alternately directed folding notches 2, 3.
- the partition wall is formed from a band which is folded to Z shape to a package which forms a set of inlet channels on one side of the partition wall and a set of outlet channels on the other side of the partition wall.
- the surface structure of the metal band comprises a set of protrusions which are provided to, when the metal band is folded and comprises a set of inlet channels and outlet channels, give rise to an increased turbulence during flow through the channels in the partition wall, whereby additional flow ways are formed according to what will be explained in the following.
- the protrusions are made as a corrugation obliquely made on the band, preferably inclined 40°-70° in relation to the direction of the folding notches 2, 3.
- the protrusions also functions as spacers and give rise to a rigid construction even when the band is made in thin material such as sheet metal with a thickness less than 0,2 mm, preferably less than 0,1 mm. Even material with a thickness down to and less than 0,05 mm can be used with a good result.
- the metal band la is folded to a partition wall lb which is provided with a set of inlet channels 21, whereby one is shown is unfolded position in Figure 2 and a set of outlet channels 22.
- the partition wall lb is provided with seals 5, 6 in the respective end portions of the metal band la, which seals are intended to bear on an upper and a lower surface 22, 23 of a housing 4 surrounding the partition wall lb.
- Each of the inlet channels 21 are formed by an upper and a lower substantially plane surface 24, 25 and a fold 26 which connects the upper and the lower surface.
- each of the outlet channels 22 are formed by an upper and a lower substantially plane surface 27, 28 and a fold 29 connecting the upper and the lower surface.
- Each of said sets of inlet channels and outlet channels are thus defined by an upper and a lower substantially plane surface and a fold connecting said surfaces, and where the upper and the lower substantially plane surfaces are made substantially parallel.
- the corrugations at adjacent folds in the folded metal band cross each other and form a stable and non-rattling package with large volume when the metal band is pressed together. Between the folds of the band flow channels are made with a stable geometry. It is advantageous for the silencing effect if each of these channels with help of the corrugations form a large amount of irregular flow ways of different length.
- the sound waves that pass through the channels are divided into many dephased wave parts that tend to quench each other.
- the band is made so that direct flow is prevented and so that it is not poosible to look through it.
- the partition wall can be provided with perforations whereby pressure pulsations through the partition wall give rise to additional silencing of noise.
- substantially opposite directed flow paths means that the average flow through the paths are opposite directed whereby the use of protrusions, for example in the form of corrugations for generating a large amount of flow ways within the respective opposite directed flow path, does not change the fact that the flow paths are substantially opposite directed.
- each of the inlet and outlet channels in said sets of inlet and outlet channels 21, 22 has an extension length from turning chamber 7 to turning chamber 8, which substantially exceeds the extension length from an inner fold edge 26 to an outer fold edge 29 of said inlet and outlet channels.
- the partition wall lb is placed in said housing 4 whereafter the housing is closed by mounting the upper surface 22 to it.
- the housing 4 is provided with an envelope surface 30 and two side surfaces 31, 32. Together the envelope surface and the side surfaces form a closed volume. Two opposite surfaces of the envelope surface are provided with an inlet opening 9 and an outlet opening 10.
- the positioning of the partition wall lb inside the housing is made such that the folds 29 of the outlet channels are placed against the surface of the envelope surface 30 that is provided with said inlet opening and the folds 26 of the inlet channels are placed against that side of the envelope surface 30 that is provided with said outlet opening 10.
- the partition wall lb and the housing are formed with a rectangular cross section, which leads to an effective manufacturing process.
- Two turning chambers 7, 8 are provided in connection with said side surfaces 31, 32. The turning chambers provides flowing from the inlet channels 21 to the outlet channels 22.
- the partition wall is formed with at least 10 pairs of inlet channels and outlet channels.
- the partition wall is formed so that the relation between the extension length from turning chamber to turning chamber and the extension length from an inner fold edge where the band is folded counterclockwise to an outer fold edge where the band is folded clockwise is between 1,1 and 6, preferably between 1,4 and 3.
- the channels have such a design that the extension length from the folds 26 of the inlet channel 21 that face the side of the housing 4 where the outlet opening 10 is arranged, to the folds 29 of the outlet channel 22 that face the side of the housing 4 where the inlet opening 9 is arranged substantially exceeds the height from an upper channel wall to a lower channel wall.
- the relation between the height from an upper channel wall to a lower channel wall and the extension length from an inner fold to fold between 1/30 and 1/100.
- Figure 3 is shown in detail the design of the partition wall with the above mentioned surface structure in the form of a corrugation obliquely made on the band, preferably inclined 40°-70° in relation to the direction of the folding notches 2, 3.
- the inlet opening and the outlet opening are symmetrically placed In respect of the partition wall whereby the flow path from inlet opening to outlet opening is the same independent of through which turning chamber the flow passes.
- the inlet opening and the outlet opening are positioned directly opposite each other on opposite sides of the housing.
- Figure 4 schematically shows an exhaust gas system for a combustion engine.
- the combustion engine is provided with a inlet 35 and an Intake and exhaust manifold 36 which is connected to said exhaust gas system.
- a first catalyst 37 is arranged downstream the outlets of the combustion engine 33.
- a silencer according to the above described invention is mounted downstream this catalyst.
- the partition wall can be made in another manufacturing process and the cross section of the partition wall can have a cross section other than rectangular.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Exhaust Silencers (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0100428 | 2001-02-09 | ||
SE0100428A SE523018C2 (sv) | 2001-02-09 | 2001-02-09 | Ljuddämpare och användning av sagda ljuddämpare i ett avgassystem för en förbränningsmotor |
PCT/SE2002/000088 WO2002064953A1 (en) | 2001-02-09 | 2002-01-21 | Silencer and exhaust gas system comprising a silencer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1358398A1 true EP1358398A1 (de) | 2003-11-05 |
EP1358398B1 EP1358398B1 (de) | 2006-06-28 |
Family
ID=20282921
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02715931A Expired - Lifetime EP1358398B1 (de) | 2001-02-09 | 2002-01-21 | Schalldämpfer und abgassystem mit schalldämpfer |
Country Status (7)
Country | Link |
---|---|
US (1) | US20040074694A1 (de) |
EP (1) | EP1358398B1 (de) |
JP (1) | JP2004520530A (de) |
AT (1) | ATE331876T1 (de) |
DE (1) | DE60212802T2 (de) |
SE (1) | SE523018C2 (de) |
WO (1) | WO2002064953A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6959782B2 (en) * | 2002-03-22 | 2005-11-01 | Tecumseh Products Company | Tuned exhaust system for small engines |
EP1953354A1 (de) * | 2003-08-11 | 2008-08-06 | ArvinMeritor Emissions Technologies GmbH | Abgasschalldämpfer |
EP1507071B2 (de) | 2003-08-11 | 2019-10-16 | Faurecia Emissions Control Technologies, Germany GmbH | Abgasschalldämpfer |
US8061476B2 (en) * | 2005-03-18 | 2011-11-22 | Tumane Enterprises Limited | Sound dampening flow channel device |
DE102005012749A1 (de) * | 2005-03-19 | 2006-09-21 | Elringklinger Ag | Strukturbauteil, insbesondere Abschirmteil |
EP3242293B1 (de) * | 2016-05-04 | 2018-12-05 | Sontech International AB | Schalldämpfungsvorrichtung für einen kanal oder eine kammer |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3507355A (en) * | 1969-05-22 | 1970-04-21 | Rohr Corp | Multi-layer face material for sound absorptive duct lining material |
US3642094A (en) * | 1969-11-26 | 1972-02-15 | Raymond W Yancey | Muffler construction |
US4017347A (en) * | 1974-03-27 | 1977-04-12 | Gte Sylvania Incorporated | Method for producing ceramic cellular structure having high cell density |
US4141433A (en) * | 1976-06-04 | 1979-02-27 | Lord Corporation | Sound absorbing structure |
US4113053A (en) * | 1976-10-06 | 1978-09-12 | Bridgestone Tire Company Limited | Sound absorbing body |
US5250489A (en) * | 1990-11-26 | 1993-10-05 | Catalytica, Inc. | Catalyst structure having integral heat exchange |
JP2509478B2 (ja) * | 1991-05-09 | 1996-06-19 | 昭和飛行機工業株式会社 | ハニカム構造体およびその製造方法 |
DE4131777A1 (de) * | 1991-09-24 | 1993-03-25 | Linde Ag | Fluiddurchstroemter schalldaempfer |
US5504280A (en) * | 1991-10-31 | 1996-04-02 | Woods; Woodrow E. | Muffler for marine engines |
WO1994029062A1 (fr) * | 1993-06-07 | 1994-12-22 | Nippon Yakin Kogyo Co., Ltd. | Support metallique de nettoyage des gaz d'echappement et procede pour sa fabrication |
US6207116B1 (en) * | 1994-08-04 | 2001-03-27 | Enklaven Ab | Catalytic purification device |
US6152258A (en) * | 1999-09-28 | 2000-11-28 | Brunswick Corporation | Exhaust system with silencing and water separation capability |
SE524367C2 (sv) * | 2000-01-05 | 2004-07-27 | Volvo Ab | Förfarande och arrangemang för behandling av ett gasflöde |
SE523351C2 (sv) * | 2000-10-04 | 2004-04-13 | Volvo Ab | Förfarande för filtrering av partiklar i gasflöde inkluderandes värmeväxling |
-
2001
- 2001-02-09 SE SE0100428A patent/SE523018C2/sv not_active IP Right Cessation
-
2002
- 2002-01-21 JP JP2002564248A patent/JP2004520530A/ja not_active Withdrawn
- 2002-01-21 AT AT02715931T patent/ATE331876T1/de not_active IP Right Cessation
- 2002-01-21 WO PCT/SE2002/000088 patent/WO2002064953A1/en active IP Right Grant
- 2002-01-21 DE DE60212802T patent/DE60212802T2/de not_active Expired - Lifetime
- 2002-01-21 EP EP02715931A patent/EP1358398B1/de not_active Expired - Lifetime
- 2002-01-21 US US10/466,854 patent/US20040074694A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO02064953A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE331876T1 (de) | 2006-07-15 |
SE523018C2 (sv) | 2004-03-23 |
WO2002064953A1 (en) | 2002-08-22 |
EP1358398B1 (de) | 2006-06-28 |
JP2004520530A (ja) | 2004-07-08 |
US20040074694A1 (en) | 2004-04-22 |
DE60212802D1 (de) | 2006-08-10 |
WO2002064953A8 (en) | 2004-05-27 |
SE0100428L (sv) | 2002-08-10 |
SE0100428D0 (sv) | 2001-02-09 |
DE60212802T2 (de) | 2007-01-18 |
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