US1611475A - Silencer - Google Patents

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Publication number
US1611475A
US1611475A US54612622A US1611475A US 1611475 A US1611475 A US 1611475A US 54612622 A US54612622 A US 54612622A US 1611475 A US1611475 A US 1611475A
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Prior art keywords
sections
conduit
section
gases
tube
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Expired - Lifetime
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Maxim Hiram Percy
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Maxim Silencer Co
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Maxim Silencer Co
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    • 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
    • F01N13/00Exhaust 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
    • F01N13/007Apparatus used as intake or exhaust silencer
    • 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
    • F01N1/003Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • 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
    • F01N1/08Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • 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
    • F01N1/08Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/089Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10Air intakes; Induction systems
    • F02M35/10091Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10118Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements with variable cross-sections of intake ducts along their length; Venturis; Diffusers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12Intake silencers Sound modulation, transmission or amplification
    • F02M35/1205Flow throttling or guiding
    • F02M35/1211Flow throttling or guiding by using inserts in the air intake flow path, e.g. baffles, throttles or orifices; Flow guides
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12Intake silencers Sound modulation, transmission or amplification
    • F02M35/1205Flow throttling or guiding
    • F02M35/1227Flow throttling or guiding by using multiple air intake flow paths, e.g. bypass, honeycomb or pipes opening into an expansion chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12Intake silencers Sound modulation, transmission or amplification
    • F02M35/1255Intake silencers Sound modulation, transmission or amplification using resonance
    • F02M35/1266Intake silencers Sound modulation, transmission or amplification using resonance comprising multiple chambers or compartments
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12Intake silencers Sound modulation, transmission or amplification

Description

Dec. 21,1926. 1, 11,475

H. P. MAXIM S ILENCER Filed March 26, 1922 BY "W ATTORNEYS Patented Dec.. 21, 1926.

UNITED STATES mama run SILENCER nnorrour.

OMPANY, OF HARTFORD,

PATENT OFFICE.

CONNECTICUT, A CORPORATION OF CON- SILENCER.

Application filed. March 23, 1922. Serial No. 546,126.

The present invention relates to silencers or mutflers such as are used in connection with gas or oilenginesto reduce the noise of the exhaust or in connection with various kinds of steam and pneumatic machinery for deadening the discharge or intake noises thereof.

One object of the invention is to provide a mufller or silencer of the eneral character above mentioned which wil effectively perform itsfunction without creating back pressure.

To this end, the invention contemplates broadly the provision, in an exhaust or intake muflier, of asilencing conduit constructed and arranged to obstruct the escape of the sound waves without throttling the flow of the sound propagating medium.

' In carrying out this feature of the invention the silencing conduit is made to comprise at least one section, the walls of which are shaped in accordance with the principles of Venturi tube construction to provide a gradually contracting portion and 85 a gradually expanding portion, the former beingv arranged to discharge into the latter. As the exhaust gases pass through a conduit constructed in this manner the sound waves which strike the tapering walls of the con tracting portions are reflected backwardly and are trapped and as a result only such sound waves escape as pass directly through the small end of the contracted portion with-' out striking against the converging walls thereof. By reason of the Ventnri action of the expanding or diverging portion of the conduit, the velocity of the gases is increased in the restricted portion to such an extent that the volume of flow per unit of time of said gases or propagating medium is not materially reduced and consequently the discharge capacity of the conduit is not-reduced and no undesirable back pressure is created.

Another object (if the invention is to pro ide, in an exhaust muffler for internal combustion engines, 'lneansxwhereby the head or advance portion of the intermittent "or pulsating stream ofexhaust gases will serve to draw out the tail or rear portion. of the latter, and thus to assist in scavenging the engine cylinders.

Another object of the invention is to provide certain new and useful improvements in.

and claimed, the advantages of which will,

be apparent to those skilled in the art.

In the accompanying drawings,

Fig. 1 is a longitudinal sectional view of a silencer embodying one feature ofthe present invention Fig. 2 is a section on the line 2-2 of Fig. 1; I

Fig. 3 is a view similar to Fig. 1 showing a modification of the construction illustrated therein; I

Figs. 4, 5, and 6 are longitudinal sectional views of silencers embodying in alternative forms certain additional features of the present'invcntion.

Referring first to Figs. 1 and 2 of the drawings, the silencer or muflier therein illustrated consists of a conduit comprising a plurality of sections 2, each having gradually.

contracting portions 3 and. gradually expanding portions 4 relatively arranged to producethe effect of the well-known Venturi tube upon a fluid or gas flowing therethrough. The inventor" has discovered that by providing, in a silencing conduit, one or more tubular sections having converging walls as in the case of the illustrated sections 3, most of the sound waves will strike the converging walls and be reflected backwardly so that they will be effectively trapped, the only sound waves finallyiescaping beingthose which pass directly through the several re stricted portionspf the conduit without first engaging any portions of the walls thereof.

It is very important in most engines'and in many forms of machinery in connection with which mufliers are ei'nployed that the exhaust or discharge shall not be obstructed so as to produce back pressure in the engine cylinders or pressure chambers of the machinery.

,To prevent the creation of back pressure the present invention contemplates the employment, in conjunction with the contracted sections 3, of the tabular sections 4 having graduall diverging side walls, thelatter regularly recurring contractions and exsections eing arranged to receive the sound propagating medium directly from the small agating gases. 7 1

ends of the converging sections 3 and to Fig. 4 is illustrative of a'silencer which draw said medium through said converging embodies another feature of the present insections so that its flow will not be substanvcntion. As shown, a continuous tube 6 is tlally retarded therein. provided with a series of Venturi sections 7 pansions in the stream of thesound prop-,

As the gases which carry the sound waves which may be similar to those already de- 1 flow through the expanding sections 4 of the scribed in connection with the Figs. 1 and 2.

conduit these sections act in substantially the The tube 6, which serves as a conductor for same manner as a Venturi tube to expand the exhaust gases or other sound propagatthe'stream of gas and to lower its pressure ing medium, fits tightly within a cylindrical and thereby to assist in increasing the distube '8 to form annular compartments oi charge capacityof the conduit. Furtherchambers 9 between the enlarged portions more, the noise values are spread over a of the tube 6, each chamber 9 being sub-' much greater area and consequently their stantially gas tight except for connections value per square inch becomes much reduced. through a plurality of ports 10 to the inner As the gases pass through the contractin sections 3, the sound waves are reflected an the noise value of those waves which escape tube 6 at the region of lowest pressure in the respective Venturi section of said tube. \Vith this construction the sound waves through the small ends of these sections bear are reflected backwardly by each converging the same relation to the noise value of the wall portion of the tube and by reason of waves entering said sections .as the minimum the shape of the succeeding diverging wall cross-sectional areas of these sections bear to portions the flow of the gases is not matethe maximum cross-sectional areas thereof. rially impeded. Furthermore by reason of Thus, each time the gases enter a new conthe low pressure which exists in the retracting section, a relatively large quantity stricted portions of the Venturi sections 7 of the remaining sound waves are reflected the gases in the chambers 9 are partially exbackwardly and trapped and only a. relahausted through the ports 10 at each pulsatively small quantity are permitted to escape. tion of the exhaust, leaving a partia vacuum Consequently by -employing a sufficient numwithin each of said chambers. This partial ber of contracting sections in the silencing vacuum in the chambers 9 satisfies itself conduit nearly all of the sound waves will from or, in other words, is relieved by the ultimately be trapped so that the noise will following gases. Thus the head of each be practicall silenced by the time the exexhaust pulsation becomes effective to pull haust gases all emerge fromthe silencer. out the tail thereof and thus to secure I It will be un erstood that by reason of complete scavenging of the engine cylinders the Venturi action of the diverging sections or other pressure chambers- The inner tube 4, the velocity of the flow through the re- 6 may be rigidly secured in any suitable stricted portions of the conduit will be inmanner to the outer tube 8 or the tubes 6 creased in proportion to the amount of reand 8 may be detachably'held in assembled duction in cross-sectional area of the conrelation by means such as a spring latch 12' duit at these points. Thus substantially the which may be released to permit convenient same volume. per unit of time will pass removal of the inner tube for cleaning purthrough said restricted portions as passes. inl poses.

' the same time through'theunrestricted por- .A modification of the construction just dctions of the conduit. Accordingly, the least scribed is shown in Fig. 5. In this figure possible resistance is offered to the flow of the silencing conduit comprises a seriesol' the gases, the discharge thereof is practiseparate sections 14 each having a contracted cally unretarded and no back pressure is inlet 15', an enlarged intermediate portion created. 16 and a contracted outlet 17. The inlet 15 It is of course, hf importance that the of each section 14 is of somewhat largerdiwalls of the converging portions of the Venameter than the outlet 17 thereof and the turi sections shall be so shaped and pitched several sections are arranged in axial alineas to reflect the Sound waves to best advanment. The outlet of each preceding section tage Without creating 00 mll h fr c ional reis arranged totelescope within the inlet of sistance to the flow of the gases in which the each succeeding section. Thus the forward sound waves travel and also that the dihalf of each section 14 and the rear half verging portions of the Venturi sections shall of the section 14 next in advance thereof in be properly proportioned to produce the decombination constitute a Venturi section sired effect .upon the flow of the gases. such, in eflfechas the Venturi sections in the In the modified construction shown in Fig. forms of silencers heretofore described. 3, fhe several Venturi sections 5 have been The separately constructed sections 14 may non-uniformly spaced in the conduit to break be independently secured wlthin an outer I up the resonance resulting from a series of cylindrical tube 18 by means of screws or sections or units 23 which correspond to the conduit sections 14 of the construction shown in Fig. 5. Each unit 23 includes, in

I addition to the expanding and contracting ortions 24 and 25 through which the exaust gases flow, a tube 26 which cooperates with similar tubes on other units 23 toconstitute an outercylindrical shell in which low pressure chambers 32 are formed. As shown, the outer tube 26 of each unit 23 is made integral with the contracting portion 25 While the expandin portion 24 is riveted at 27 to large end of the contracting portion 25. The tubes 26 of the several units 23 have universal joint connections with each other thus providing mmufller'conduit which is flexible and may be bent to avoid obstructions or otherwise adapt itself for convenient vinstallation. To this end each tube 26 is formed with spherically curved end portions 28 and 29, the portions 29 of each tube- 26 constituting a socket for receiving the portion 28 of the adjacent tube 26 thereby orming a ball and socket joint connection between. said tubes 26. The tubes 26 are made of such length as to insure that the units 23 will be arranged with their outlet and inlet'ends telescoping but separated by 'the details of construction and arran ement' of parts may be resorted to without eparting from the spirit and scope of the invention as hereinafter claimed.

Claims:

1. A muflier forsilencingtheexhaust of an internal combustion'engme comprislp' g a conduit for thefe'xhaust gases having a nturi-like passageway ther'ein'and a clia ber l closed on all sides except. for an -openin therefrom into the restricted portion of sai A passageway. v

2. In a muflier for silencing the exhaust of an internal. combustion engine, a conduit comprising ayconverging section and B/dif .verging section, said converging section opening into said diverging section to provide a Venturi-like passageway therebetween and a chamber closed on all sides except for an opening therefrom into the re stricted portion of said passageway.

3. In a mufiler for silencing the exhaust .of an'in'ternal combustion engine, a conduit comprising a series of alternate converging and diverging sections, each converging section opening into the next succeeding diverging section to form. a series of Venturi-like passa eways in said conduit, and a separate cham r surroundin each passageway, each being closed at all sides except for an opening therefrom into the restricted portion of its respective passageway.

4. A mufiier for silencingthe exhaust of an internal combustion engine having, in combination, a conduit for the exhaust gases comprising a converging section and a di-' verging section, the converging section having its contracted end telescoping within the contracted end of the diverging section and separated therefrom by an annular space, and agas tight chamber surrounding said contracted ends and communicating with the interior of said diverging section through said annular space.

5. A mufiler comprising a flexible conduit for a sound propagating medium comprising a plurality of. separate longitudinal sections directly joined together by flexible joints to permit a limited amount of uni-. versal movement between adjacent sections,

and saidsections having passagewa s con structed and arranged to obstruct t e pas sage of the sound waves. v

6. A muflier comprising a flexible conduit for the sound propagating medium comprising a pluralit of se arate lon itudinal sections direct y joine together by a flexible. jointto permit a limited amount of universal movement between adjacent sections, said sections combining .to afford a succession of Venturi-like passages for obstructing the sound. waves without throttling the flow of the sound propagating medium. p I

'7. A mufiier comprising a flexible conduit for the sound propagating medium consisting of a. plurality of longitudinal sections joined together to permit. a limited amount of universal movement between adjacent sections, said sections combining to afford a successionof Venturi-like passages for obstructin .the' sound waves without throttling the ow of the sound propagating medium, anda series of low pressure chambers communicating with the'restricted portions of said. passages.

8. An exhaust mufiler having, in combiv nation, a series of units each comprising di-. verging and converging inner conduit sections and an outer tubular section having two spherically curved portions spaced longitudinally thereon, one of said curved portionsoneach tubular section being adapted and arranged to provide when assembled a mufiier conduit having a succession of Venturi-like silencing passages. y

In testimony whereof I have affixed my signature.

HIRAM PERCY MAXIM

US1611475A 1922-03-23 1922-03-23 Silencer Expired - Lifetime US1611475A (en)

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US1636238A US1636238A (en) 1922-03-23 1926-10-01 Silencer

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Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567568A (en) * 1949-08-25 1951-09-11 Peter A Lievense Baffle type muffler with plural expansion chambers
US2745509A (en) * 1950-09-22 1956-05-15 Connor Eng Corp Noise reduction device
US2770313A (en) * 1952-01-19 1956-11-13 Int Harvester Co Combination tail pipe and muffler
US2860663A (en) * 1953-08-07 1958-11-18 William J Kroeger Structure for diverting gases of high velocity
US3159239A (en) * 1962-05-11 1964-12-01 Walker Mfg Co Muffler
US3608666A (en) * 1970-11-17 1971-09-28 Karl Borje Olsson Silencer
US4102393A (en) * 1975-09-23 1978-07-25 Uop Inc. Heat exchange apparatus
US4348862A (en) * 1977-07-01 1982-09-14 Kawasaki Jukogyo Kabushiki Kaisha Exhaust system for a two-cycle engine
US4371053A (en) * 1980-03-17 1983-02-01 Hills Industrie Limited Perforate tube muffler
US4683884A (en) * 1986-04-11 1987-08-04 Md Engineering Noise attenuating smokeless surgical device
US4690245A (en) * 1983-03-17 1987-09-01 Stemco, Inc. Flattened venturi, method and apparatus for making
US5123501A (en) * 1988-10-21 1992-06-23 Donaldson Company, Inc. In-line constricted sound-attenuating system
US5173576A (en) * 1990-12-24 1992-12-22 Feuling Engineer, Inc. Muffler for an internal combustion engine
US5530214A (en) * 1994-09-20 1996-06-25 The United States Of America As Represented By The Secretary Of The Navy Venturi muffler
US5590688A (en) * 1994-03-09 1997-01-07 Neles-Jamesbury Oy Device provided with a gas flow channel to reduce noise caused by throttling a gas flow
WO1997004220A1 (en) * 1995-07-17 1997-02-06 Alain Ferri Internal combustion engine silencer device
WO2001027461A1 (en) * 1999-10-12 2001-04-19 Siemens Automotive Inc. Wedge section multi-chamber resonator assembly
WO2002066798A1 (en) * 2001-02-21 2002-08-29 Volvo Lastvagnar Ab Apparatus for damping resonance in a conduit
EP1715238A2 (en) * 2005-04-21 2006-10-25 Ingersoll-Rand Company Double throat pulsation dampener for a compressor
US20070045044A1 (en) * 2005-08-26 2007-03-01 Sullivan John T Flow-through mufflers with optional thermo-electric, sound cancellation, and tuning capabilities
US20070107982A1 (en) * 2005-11-17 2007-05-17 Sullivan John T Flow-through sound-cancelling mufflers
US20080023262A1 (en) * 2006-07-28 2008-01-31 Denso Corporation Air-intake apparatus
WO2008087023A1 (en) * 2007-01-19 2008-07-24 Nordischer Maschinenbau Rud. Baader Gmbh + Co. Kg Device for damping noise generated by exhaust air
US20080178583A1 (en) * 2007-01-12 2008-07-31 Yuguang Zhang Device with Trace Emission for Treatment of Exhaust Gas
US20090057056A1 (en) * 2007-08-31 2009-03-05 Fred Baumgartner Vehicular exhaust resonator with cooling feature
US20120152399A1 (en) * 2010-12-20 2012-06-21 Marc Gregory Allinson F.U.N tunnel(s)
US8210309B1 (en) * 2008-09-25 2012-07-03 Parallaxial Innovation LLC Channeling gas flow tube
US8479878B2 (en) * 2008-09-25 2013-07-09 Parallaxial Innovation LLC Channeling gas flow tube
JP2014043855A (en) * 2012-08-01 2014-03-13 Tatsuya Kimura Engine intake pipe
US20150337878A1 (en) * 2008-09-25 2015-11-26 Parafluidics Llc Channeling fluidic waveguide surfaces and tubes
US20160305384A1 (en) * 2015-04-20 2016-10-20 Hitachi, Ltd. Automotive fuel pump

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567568A (en) * 1949-08-25 1951-09-11 Peter A Lievense Baffle type muffler with plural expansion chambers
US2745509A (en) * 1950-09-22 1956-05-15 Connor Eng Corp Noise reduction device
US2770313A (en) * 1952-01-19 1956-11-13 Int Harvester Co Combination tail pipe and muffler
US2860663A (en) * 1953-08-07 1958-11-18 William J Kroeger Structure for diverting gases of high velocity
US3159239A (en) * 1962-05-11 1964-12-01 Walker Mfg Co Muffler
US3608666A (en) * 1970-11-17 1971-09-28 Karl Borje Olsson Silencer
US4102393A (en) * 1975-09-23 1978-07-25 Uop Inc. Heat exchange apparatus
US4348862A (en) * 1977-07-01 1982-09-14 Kawasaki Jukogyo Kabushiki Kaisha Exhaust system for a two-cycle engine
US4371053A (en) * 1980-03-17 1983-02-01 Hills Industrie Limited Perforate tube muffler
US4690245A (en) * 1983-03-17 1987-09-01 Stemco, Inc. Flattened venturi, method and apparatus for making
US4683884A (en) * 1986-04-11 1987-08-04 Md Engineering Noise attenuating smokeless surgical device
US5123501A (en) * 1988-10-21 1992-06-23 Donaldson Company, Inc. In-line constricted sound-attenuating system
US5173576A (en) * 1990-12-24 1992-12-22 Feuling Engineer, Inc. Muffler for an internal combustion engine
US5590688A (en) * 1994-03-09 1997-01-07 Neles-Jamesbury Oy Device provided with a gas flow channel to reduce noise caused by throttling a gas flow
US5530214A (en) * 1994-09-20 1996-06-25 The United States Of America As Represented By The Secretary Of The Navy Venturi muffler
WO1997004220A1 (en) * 1995-07-17 1997-02-06 Alain Ferri Internal combustion engine silencer device
US5902970A (en) * 1995-07-17 1999-05-11 Ferri; Alain Muffler for internal combustion engines, especially in aviation of improved geometry and material
WO2001027461A1 (en) * 1999-10-12 2001-04-19 Siemens Automotive Inc. Wedge section multi-chamber resonator assembly
US6347609B1 (en) 1999-10-12 2002-02-19 Siemens Canada Limited Wedge section multi-chamber resonator assembly
WO2002066798A1 (en) * 2001-02-21 2002-08-29 Volvo Lastvagnar Ab Apparatus for damping resonance in a conduit
US20040104071A1 (en) * 2001-02-21 2004-06-03 Volvo Lastvagnar Ab Apparatus for damping resonance in a conduit
US7549509B2 (en) * 2005-04-21 2009-06-23 Ingersoll-Rand Company Double throat pulsation dampener for a compressor
US20060237081A1 (en) * 2005-04-21 2006-10-26 Ingersoll-Rand Company Double throat pulsation dampener for a compressor
EP1715238A2 (en) * 2005-04-21 2006-10-25 Ingersoll-Rand Company Double throat pulsation dampener for a compressor
US9062679B2 (en) * 2005-04-21 2015-06-23 Ingersoll-Rand Company Double throat pulsation dampener for a compressor
EP1715238A3 (en) * 2005-04-21 2008-02-13 Ingersoll-Rand Company Double throat pulsation dampener for a compressor
US20090218164A1 (en) * 2005-04-21 2009-09-03 Ingersoll-Rand Company Double throat pulsation dampener for a compressor
US7610993B2 (en) 2005-08-26 2009-11-03 John Timothy Sullivan Flow-through mufflers with optional thermo-electric, sound cancellation, and tuning capabilities
US20070045044A1 (en) * 2005-08-26 2007-03-01 Sullivan John T Flow-through mufflers with optional thermo-electric, sound cancellation, and tuning capabilities
US20070107982A1 (en) * 2005-11-17 2007-05-17 Sullivan John T Flow-through sound-cancelling mufflers
US7600607B2 (en) * 2005-11-17 2009-10-13 John Timothy Sullivan Flow-through sound-cancelling mufflers
US20080023262A1 (en) * 2006-07-28 2008-01-31 Denso Corporation Air-intake apparatus
US7857095B2 (en) * 2007-01-12 2010-12-28 Yuguang Zhang Device with trace emission for treatment of exhaust gas
US20080178583A1 (en) * 2007-01-12 2008-07-31 Yuguang Zhang Device with Trace Emission for Treatment of Exhaust Gas
WO2008087023A1 (en) * 2007-01-19 2008-07-24 Nordischer Maschinenbau Rud. Baader Gmbh + Co. Kg Device for damping noise generated by exhaust air
US7845465B2 (en) * 2007-08-31 2010-12-07 Tenneco Automotive Operating Company Inc. Vehicular exhaust resonator with cooling feature
US20090057056A1 (en) * 2007-08-31 2009-03-05 Fred Baumgartner Vehicular exhaust resonator with cooling feature
US8210309B1 (en) * 2008-09-25 2012-07-03 Parallaxial Innovation LLC Channeling gas flow tube
US8479878B2 (en) * 2008-09-25 2013-07-09 Parallaxial Innovation LLC Channeling gas flow tube
US20150337878A1 (en) * 2008-09-25 2015-11-26 Parafluidics Llc Channeling fluidic waveguide surfaces and tubes
US9739296B2 (en) * 2008-09-25 2017-08-22 Parafluidics Llc Channeling fluidic waveguide surfaces and tubes
US8967326B2 (en) * 2008-09-25 2015-03-03 Parafluidics, Llc Channeling gas flow tube
US20140158249A1 (en) * 2008-09-25 2014-06-12 Thomas George Schlosser Channeling gas flow tube
US20120152399A1 (en) * 2010-12-20 2012-06-21 Marc Gregory Allinson F.U.N tunnel(s)
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