EP1060328B1 - Silencieux - Google Patents

Silencieux Download PDF

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Publication number
EP1060328B1
EP1060328B1 EP98963397A EP98963397A EP1060328B1 EP 1060328 B1 EP1060328 B1 EP 1060328B1 EP 98963397 A EP98963397 A EP 98963397A EP 98963397 A EP98963397 A EP 98963397A EP 1060328 B1 EP1060328 B1 EP 1060328B1
Authority
EP
European Patent Office
Prior art keywords
silencing
elements
diffuser
silencing elements
cavities
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.)
Expired - Lifetime
Application number
EP98963397A
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German (de)
English (en)
Other versions
EP1060328A1 (fr
Inventor
Svend Frederiksen
D. W. Bingham
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Silentor Holding AS
Original Assignee
Silentor Holding AS
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
Application filed by Silentor Holding AS filed Critical Silentor Holding AS
Publication of EP1060328A1 publication Critical patent/EP1060328A1/fr
Application granted granted Critical
Publication of EP1060328B1 publication Critical patent/EP1060328B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • 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
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single housing
    • 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
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction

Definitions

  • silencers designed according to conventional principles need to be rather long to become effective.
  • a typical example is provided by an exhaust silencer for a stationary gas turbine plant. If the silencer could be made short this would in many cases reduce building costs.
  • silencing techniques this is difficult, in particular when a broad-banded silencing, covering all audible frequencies, is required, and when the pressure drop is required to be low.
  • silencers to be installed immediately upstream of heat recovery boilers, catalysers, filters, or other apparatuses in a piping system. Such apparatuses add to the horizontal space requirement of the system. At the same time, they are usually designed with rather large transverse dimensions. In such cases, short and wide silencers are called for. In addition, many boilers and other air- or gas-treatment equipment, etc., require an even flow distribution across their inlet in order to function effectively.
  • the invention relates to a type of silencer which is particularly fit for such applications.
  • US 5,578,277 and US 2,075,316 disclose silencing apparatuses according to the precharacterising portion of claim 1.
  • the present invention aims at providing a silencer which may confer a broad-banded silencing while ensuring a relatively low pressure drop over the silencer.
  • the total gas flow to be silenced is split into three or more parallel flows which are then each silenced in individual silencer elements which may be relatively small, separate silencer elements.
  • Such elements are preferably designed as reflective silencers, often as reflective and absorptive silencers.
  • the invention relates to a silencing apparatus which is throughflowed by a gas and which is arranged within a pipe or duct system, the gas flow at one or more stages within the apparatus being divided into three or more subflows which are preferably substantially parallel to each other, each subflow (or substantially each subflow) throughflowing a silencing element causing at least reflective silencing provided by changes in cross-section area, the silencing elements being arranged beside each other within an outer envelope, at least 80% of the volume inside said envelope being constituted by air, gas and/or solid materials, and at least a major part of said volume having silencing functions, said subflows merging downstream of said silencing elements, either within said apparatus or further downstream in said pipe or duct.
  • each subflow throughflow s its own silencing element.
  • At least 85%, more preferred at least 90%, and even more preferred at least 95% and up to substantially all of the volume inside the envelope is constituted by air gas and/or solid materials, and at least 60%, preferably at least 70%, and more preferably at least 80%, such as up to 90% or even 95% or higher, of the volume has silencing functions, such as will be explained in the following and understood from the drawings.
  • the volume inside the envelope is intended to designate the volume defined radially by the exterior envelope and axially by the volume through which the silencers or the majority of the silencers extend.
  • At least one of the cross-section area changes (10) preferably takes place inside the silencing elements, the change in cross-section area preferably being at least by a factor two.
  • All or substantially all of the subflows preferably derive from an upstream plenum chamber or from an upstream diffuser . At any rate, it is preferred that all or substantially all of the subflows merge into a downstream plenum chamber immediately or substantially immediately downstream of the silencing elements.
  • the outflows from the silencing elements are utilized to contribute to a substantially even inflow across the inlet section of a downstream device which takes advantage of such a substantially even inflow, e.g., a heat recovery boiler/heat exchanger, a catalyst, or a filter or other equipment, either by direct inflow or via a plenum chamber.
  • a substantially even inflow e.g., a heat recovery boiler/heat exchanger, a catalyst, or a filter or other equipment, either by direct inflow or via a plenum chamber.
  • the attenuation characteristic of the apparatus can be tailored to what is optimal in the particular application. For instance, with reciprocating engines, maximum attenuation is usually required at lower frequencies. With gas turbines, a more even attenuation across the frequency range is normally called for. Conventional gas turbine silencers are usually of the 'splitter type' , relying mainly on absorptive silencing; it has been found that in many cases such silencers do not provide sufficient low frequency attenuation. The invention compensates for this deficiency by providing a substantial reflective silencing effect, with moderate or no increase in pressure drop.
  • a whole series of silencer apparatuses of different sizes can be derived from, e.g., modulized silencing elements manufactured in a limited number of standardised sizes.
  • the assembly of silencing elements can be designed in such a way that the various elements support each other mechanically.
  • moderate plate thickness and moderately advanced materials can be selected. All these factors will tend to reduce manufacturing costs.
  • Fig. 1 illustrates the principle of dividing a gas flow into three or more parallel flows in silencer elements.
  • the silencing apparatus is contained within a casing 1.
  • two inlet pipes or ducts, 2a and 2b lead exhaust gas into the apparatus.
  • 2a and 2b could be connected to the two exhaust manifolds of a V-type diesel engine.
  • An upstream plenum chamber 4 collects the two incoming gas flows and distributes the merged gas flows to a number of silencer elements 6a ....
  • chamber 4 contributes to overall silencing, by sound reflection at inlet and outlet changes in cross-sectional area, and by function of inserted sound absorptive material, Abs. silencer elements 6a... are divided into two main parts, 7 and 8, being mainly reflective and absorptive in their respective acoustic function.
  • An internal pipe, 9, leads gas flow into the first part at position 10, where a major change in cross-sectional area causes sound reflection.
  • the divided gas flows merge in plenum chamber 5, from which they leave the apparatus via exhaust pipe or duct 3.
  • Figs. 2, 3, and 4 show a second embodiment of the invention.
  • the gas flow is distributed to in total nine silencer elements 6a ... i.
  • a diffuser 14 is fitted onto pipe 9, to recover dynamic pressure, thereby lowering the pressure drop across the apparatus.
  • a heat recovery boiler/heat exchanger, a catalyser, a filter, or other equipment with a targe cross sectional area, 12, is placed immediately downstream of the assembly 6a ... of silencing elements.
  • the parallel part flows merge once again in plenum chamber 5, downstream of apparatus 12. It can be seen that an even inflow to apparatus 12 is achieved with a vanishing distance to the silencing part.
  • Inlet pipe or duct 2 is fitted with a diffuser 15, consisting of a conical first part 16 and a combined axial-radial diffuser 17, into which flow-dividing splitters 18 are inserted.
  • This diffuser serves, both recovery of dynamic pressure and even distribution of flow to each of the nine silencer elements 6a ... i.
  • Figs. 5 and 6 show a third embodiment of the invention.
  • each silencer element 6a ... f has been made as a separate unit with its own casing 13.
  • a downstream apparatus (boiler etc.), 12 is placed downstream of the silencing element assembly, which contributes to an even inflow distribution to apparatus 12, here via plenum chamber 5.
  • two cavities, 22 and 23 exist in the centre, between silencing elements, and outside the elements. Both cavities are closed at the left end by division wall 24, so that there is no flow within the cavities, and so that cavities are acoustically isolated at the left end. At the other end the cavities communicate acoustically with plenum chamber 5, via a perforated plate 25.
  • the outer cavity, 23, is empty, so that it acts as a quarter-wave sound absorber. By fitting an extra member into cavity 23, the centre frequency of the absorption could be raised, e.g. to target a known peak in the unattenuated frequency spectrum.
  • central cavity 22 is provided with sound absorptive material to attain more broad-banded sound absorption.
  • first diffuser part 16 of the apparatus at its upstream end is an outlet diffuser of the gas turbine.
  • the entire flow distribution to silencer elements 6a ... f takes place within the second part, 17, of diffuser 15.
  • Pressure recovery may take place in all parts 16, 17, and 14. Alternatively, one may prefer to have pressure recovery only in parts 16 and 14, to provide added margin towards flow separation in part 17, which is the most separation-prone flow part element.
  • This increased flow-dynamic efficiency can be utilised either for gaining gas turbine shaft work or for selecting rather narrow total flow area within pipes of silencer elements, retaining a pressure drop across the unit which is equal to the pressure drop across a conventional silencer. In this way, especially low frequency sound attenuation can be enhanced.
  • fig. 7 shows the inlet part of a fourth embodiment according to the invention, being a variation of the third embodiment.
  • a chamber 4 has been fitted onto inlet diffuser 15, to communicate acoustically with the pipe /duct system prior to gas entering silencing elements 6a ... .
  • This communication is achieved by providing guide plate 27 with apertures 28.
  • Chamber 4, which is not throughflowed, is filled with sound absorptive material, Abs.
  • Abs sound absorptive material
  • Silencers can be tailored to many forms of inlets (squared, rectangular, circular) to boilers, catalysers, and filters, with an even flow distribution attained within a short distance in flow direction.
  • the acoustic attenuation characteristic can be tailored individually to varying demands for low-, mid- and high-frequency attenuation in a particular application.
  • broad-banded low- and mid-frequency attenuation is achieved with reflective sound reduction, and mid- and high-frequency attenuation by sound absorption. Peaks in unattenuated spectra can be targeted by frequency-selective built-in resonators.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Silencers (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Pipe Accessories (AREA)

Claims (17)

  1. Dispositif d'assourdissement qui est contenu dans une enveloppe extérieure et qui est adapté pour être traversé par un gaz et pour être agencé dans un tuyau ou un système de canalisation, l'écoulement du gaz au niveau d'un ou de plusieurs étages à l'intérieur du dispositif étant divisé en au moins trois écoulements secondaires de préférence sensiblement parallèles, caractérisé en ce que chacun d'au moins deux des écoulements secondaires traverse un élément d'assourdissement (6a ...) qui contient au moins une chambre acoustique (7) et au moins un passage (9, 14) pour mener le gaz dans ou hors de la chambre (7), la chambre (7) ayant une section qui est supérieure à la section du passage (9, 14), une variation brutale de section étant prévue au niveau de la transition entre le passage (9, 14) et la chambre (7), de sorte qu'un assourdissement par réflexion puisse se produire à l'intérieur dudit élément d'assourdissement, lesdits éléments d'assourdissement étant agencés côte à côte dans l'enveloppe, l'enveloppe définissant un volume d'assourdissement, le volume d'assourdissement étant défini par la section intérieure de l'enveloppe et l'étendue axiale des éléments d'assourdissement, au moins 80 % dudit volume d'assourdissement étant constitués par ledit gaz, des matériaux solides, des cavités en contact avec ledit gaz et des cavités fermées, et au moins une majeure partie dudit volume ayant des fonctions d'assourdissement, lesdits écoulements secondaires fusionnant en aval desdits éléments d'assourdissement, soit dans ledit dispositif, soit davantage en aval dans ledit tuyau ou système de canalisation.
  2. Dispositif selon la revendication 1, dans lequel la section au niveau de ladite variation de section change au moins d'un facteur 2.
  3. Dispositif selon la revendication 1, dans lequel lesdits écoulements secondaires proviennent tous ou sensiblement tous d'une chambre de détente amont (4).
  4. Dispositif selon la revendication 1, dans lequel lesdits écoulements secondaires proviennent tous ou sensiblement tous d'un diffuseur amont (15, 17).
  5. Dispositif selon l'une quelconque des revendications précédentes, dans lequel lesdits écoulements secondaires fusionnent tous ou sensiblement tous dans une chambre de détente aval (5) immédiatement ou sensiblement immédiatement en aval des éléments d'assourdissement.
  6. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les écoulements de sortie provenant des éléments d'assourdissement sont agencés de manière à contribuer à un écoulement d'entrée sensiblement uniforme à travers la section d'entrée d'une chaudière à récupération de chaleur/échangeur de chaleur, d'un catalyseur, d'un filtre ou d'un autre équipement (12) en aval, soit par un écoulement d'entrée direct, soit par l'intermédiaire d'une chambre de détente.
  7. Dispositif selon la revendication 4, dans lequel le diffuseur est pourvu d'un ou de plusieurs éléments de division d'écoulement (18) de sorte qu'au moins la partie de sortie dudit diffuseur définisse un diffuseur répartiteur (17).
  8. Dispositif selon la revendication 4 ou 7, dans lequel le diffuseur est conçu de sorte qu'aucune séparation d'écoulement majeure ne se produise de l'entrée du diffuseur (27) jusqu'aux entrées (10) vers les éléments d'assourdissement.
  9. Dispositif selon la revendication 4, 7 ou 8, dans lequel chaque ou sensiblement chaque écoulement d'entrée vers les éléments d'assourdissement (6a ...) est conçu de manière à éviter ou sensiblement éviter une séparation de l'écoulement et comprend au moins un autre diffuseur (14) rétablissant la pression dans l'écoulement d'entrée vers l'élément d'assourdissement.
  10. Dispositif selon l'une quelconque des revendications 4, 7, 8 ou 9, dans lequel la partie de sortie du diffuseur (15) est pourvue d'une ou de plusieurs ouvertures (28) qui communique(nt) avec une chambre (4) agencée en amont des éléments d'assourdissement.
  11. Dispositif selon l'une quelconque des revendications précédentes, dans lequel lesdits éléments d'assourdissement (6a ...) remplissent sensiblement la section entière contenue dans un contour extérieur.
  12. Dispositif selon l'une quelconque des revendications 1 à 10, dans lequel les contours d'au moins certains des éléments d'assourdissement ont une forme telle qu'une ou plusieurs cavités (22) sont créées entre lesdits éléments d'assourdissement (6a), chacune ou sensiblement chacune de ces cavités étant pourvue d'un élément (24) qui empêche la transmission à la fois de l'écoulement de gaz et de l'énergie sonore sans passer par lesdits éléments d'assourdissement, et ladite ou lesdites cavités communiquant avec l'écoulement de gaz en amont desdits éléments d'assourdissement et/ou avec l'écoulement de gaz en aval desdits éléments d'assourdissement.
  13. Dispositif selon l'une quelconque des revendications 1 à 12, dans lequel une ou plusieurs cavités (23) sont définies à l'extérieur des contours desdits éléments d'assourdissement, chacune ou sensiblement chacune de ces cavités étant pourvue d'un élément (24) qui empêche la transmission à la fois de l'écoulement de gaz et de l'énergie sonore sans passer par lesdits éléments d'assourdissement, et ladite ou lesdites cavités communiquant avec l'écoulement de gaz en amont desdits éléments d'assourdissement et/ou avec l'écoulement de gaz en aval desdits éléments d'assourdissement.
  14. Dispositif selon la revendication 12 ou 13, dans lequel une ou plusieurs desdites cavités sont conçues de manière à fonctionner comme un résonateur quart-d'onde d'un type connu en soi.
  15. Dispositif selon la revendication 12 ou 13, dans lequel une ou plusieurs desdites cavités sont conçues de manière à agir comme un résonateur du type résonateur de Helmholz connu en soi.
  16. Dispositif selon l'une quelconque des revendications 12 à 15, dans lequel une ou plusieurs desdites cavités sont équipées d'un matériau d'absorption des sons (Abs).
  17. Dispositif selon l'une quelconque des revendications précédentes, dans lequel une partie dudit tuyau ou de ladite canalisation d'entrée vers le diffuseur est un diffuseur d'échappement d'une turbine à gaz (26).
EP98963397A 1997-12-30 1998-12-30 Silencieux Expired - Lifetime EP1060328B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK155997 1997-12-30
DK155997 1997-12-30
PCT/DK1998/000588 WO1999035378A1 (fr) 1997-12-30 1998-12-30 Silencieux

Publications (2)

Publication Number Publication Date
EP1060328A1 EP1060328A1 (fr) 2000-12-20
EP1060328B1 true EP1060328B1 (fr) 2002-09-11

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Family Applications (1)

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EP98963397A Expired - Lifetime EP1060328B1 (fr) 1997-12-30 1998-12-30 Silencieux

Country Status (5)

Country Link
EP (1) EP1060328B1 (fr)
AT (1) ATE224003T1 (fr)
AU (1) AU1869699A (fr)
DE (1) DE69807942T2 (fr)
WO (1) WO1999035378A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9904504D0 (sv) * 1999-12-09 1999-12-09 Abb Ab Anordning och förfarande vid ljuddämpning
DE10042542A1 (de) * 2000-08-30 2002-03-14 Eberspaecher J Gmbh & Co Abgasreinigungssystem für Kraftfahrzeuge, insbesondere Diesel-Nutzfahrzeuge
DK200300343A (da) * 2003-03-05 2004-09-06 Chris Invest As An exhaust system component for a combustion engine exhaust system
NL1026879C2 (nl) * 2004-08-19 2006-02-21 Aarding Thermal Acoustics B V Geluiddemper, profieldeel en werkwijze voor het vervaardigen van een paneel.
GB2444274A (en) * 2006-12-01 2008-06-04 Bbt Thermotechnology Uk Ltd Thermal acoustic baffle
GB2479655B8 (en) 2009-03-23 2012-08-22 Vortex Performance Exhausts Ltd An improved exhaust filter
GB2487320B (en) * 2009-03-23 2013-09-25 Vortex Performance Exhausts Ltd An improved exhaust filter
CN104952440B (zh) * 2015-06-30 2019-01-11 成都普创通信技术股份有限公司 阵列式消声器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO56196C (fr) * 1933-11-21
US4105089A (en) * 1975-11-24 1978-08-08 Judd Frederick V H Flow distributor for gas turbine silencers
PL135373B1 (en) * 1981-03-10 1985-10-31 Inst Chemii Nieorganicznej Piston-type silencer
GB8307371D0 (en) * 1983-03-17 1983-04-27 Chillcotts Ltd Exhaust silencer
JPH0814033A (ja) * 1994-06-24 1996-01-16 Caterpillar Inc 内燃エンジン用モジュール触媒コンバータとマフラー
TR199701163T1 (xx) * 1995-04-11 1998-03-21 Silentor A/S Kombine haldeki �s� m�badele edici ve susturuculu bir cihaz.

Also Published As

Publication number Publication date
WO1999035378A1 (fr) 1999-07-15
ATE224003T1 (de) 2002-09-15
DE69807942T2 (de) 2003-04-30
AU1869699A (en) 1999-07-26
EP1060328A1 (fr) 2000-12-20
DE69807942D1 (de) 2002-10-17

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