US3672465A - Gas exhaust silencer - Google Patents

Gas exhaust silencer Download PDF

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Publication number
US3672465A
US3672465A US81051A US3672465DA US3672465A US 3672465 A US3672465 A US 3672465A US 81051 A US81051 A US 81051A US 3672465D A US3672465D A US 3672465DA US 3672465 A US3672465 A US 3672465A
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United States
Prior art keywords
silencer
baffle member
air
baffle
chamber
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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
US81051A
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English (en)
Inventor
Leland Francis Blatt
Frank H Wiesenhofer
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Individual
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Individual
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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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/16—Selection of particular 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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling by passing the exhaust gases through porous members
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0083—Pulsation and noise damping means using blow off silencers

Definitions

  • An air exhaust silencer comprises a housing having an air inlet and an air outlet defined by baffle members made of a porous material; a sound absorbing material is disposed in the housing between the baflIe members; the air enters through the inlet port and is broken up by the porous inlet baffle for distribution through the sound absorbing material and exhaust through the porous outlet baffle at which the air flow is further broken up to thereby considerably reduce the noise level of the exhausted air passing through the silencer.
  • the present invention relates to sound absorbing devices and more in particular to a noise subduing device to maintain a specific noise level within acceptable limits.
  • noises produced in a plant or similar working place are considerably on a higher scale than 90 dBA Most of these noises are not merely pure tones, but in most cases are a combination of sounds and may range from a low frequency roar to a high frequency squeal. Obviously, combined frequencies require differentiating of materialsinside the device to stop or absorb those frequencies or separate those frequencies in order that they not be added or combined with one another to produce a sound level unacceptable or unhealthful to human beings. Another factor to be considered is the power level of the sound field. Thus, if a great deal of noise is being produced at different frequencies, or the level of power is high, it would require extremely large and complicated silencers to reduce the noise to within a tolerance acceptable to a human being at a certain distance from the origin of the sound.
  • silencer chambers In most air tool and/or air valve applications, where a great deal of air flow is present, requires the design of silencer chambers to be of utmost consideration so as not to creat excessive back pressure within the tool or valve which will cause a slow-down in the cycle of the operation time.
  • the present invention provides an improved air exhaust silencer construction adapted to effectively reduce high noise levels to a safe level not exceeding 90dBA.
  • the present improved construction comprises a housing which has an inlet connected to the air exhaust conduit and which is filled with a sound absorbing material of a known substance which is retained at both ends of the housing between baffle members made from porous material.
  • a sound absorbing material of a known substance which is retained at both ends of the housing between baffle members made from porous material.
  • One of the bafile members which are axially located in the housing defines a high noise air inlet and the other bafile member defines a low noise exit to the atmosphere.
  • the exhausted air from the respective noise producinG apparatus enters the housing through the inlet and impinges against the first porous baffle member which acts to minutely breakup the air stream for distribution through the intermediate sound absOrbing material and final exit through the second porous baffle member at a considerably reduced noise level.
  • FIG. 1 is a longitudinal cross-section through the present improved silencer structure
  • FIG. 2 is a transverse cross-section through the structure of FIG. 1 as seen along line 2-2 thereof;
  • FIG. 3 is a longitudinal cross-section through a modified silencer similar to FIG. 1 constructed in accordance with the present invention; and v FIG. 4 is a detached detail view of the alternate end baffle member employed in the modification of FIG 3.
  • the present improved air exhaust silencer structure comprises a housing generally indicated at 10 which, at one end, is attached to an exhaust pipe or conduit 12 having connection to a noise producing device (not shown).
  • the silencer housing 10 may be of generally cylindrical or barrel like structure comprising an open-ended tubular member 14 which may be of suitable heat resistant material as generally employed in silencer structures of this kind.
  • One end of the cylindrical member 14 is closed by a front end cap 16 which has a threaded bore 18 for attachment to the air exhaust pipe 12 and which defines the inlet into the silencer.
  • baffle member 20 Inwardly of the cylindrical member 14 and directly adjacent the end cap 16 a baffle member 20 is provided composed of a radial flange portion 22 which is clamped between the end cap 16 and a radial shoulder 15 of the cylindrical member 14 to securely retain the bafile member within the housing.
  • the baffle member 20 is formed into a frustoconical section 24 which axially inwardly extends through the cylindrical member 14 a substantial distance, having an inner closed end 26.
  • the frustoconical portion 24 of the baffle member 20 is in axial alignment with the inlet 18 to form an expansion chamber 28.
  • the frustoconical portion 24 is of sufficient length to provide a sufficiently large internal surface area 30 for impingement of the exhaust air thereon and has a sufficient chamber area to accommodate free expansion of the exhaust air entering the chamber 28 frorninlet 18.
  • the baffle member 20 is made of a gas permeable material which may be heat resistant and having a high porosity such as sintered bronze or the like, to permit the expanded air to enter the cylindrical chamber 17 from the expansion chamber 28 through the porous walls of the truncated cone section 24.
  • the cylindrical chamber 17 of the cylindrical member 14 is filled with a sound absorbing material 32 of any known suitable material composition usually employed in silencer applications of this kind, which may include porous urethane, sponge rubber, felt, steel wool, coiled screening and the like. All of these materials have different effects in absOrbing sound at various frequencies.
  • baffle member 34 which comprises a substantially solid plate supported within a radial recess 36 provided in the cylindrical member 14, and retained in position by means of a lock ring 38.
  • the plate like baffle member 34 is likewise composed of a gas permeable material having a high porosity, such as for instance sintered bronze, to permit exit of the muffled air from the chamber 17 to the atmosphere.
  • exhausted air which may be hot in the case of combustion gas exhaust, enters the silencer structure through the conduit 12 and inlet 18 for entrance into the expansion chamber 28 of the frustoconical portion 24 of the first baffle member 20.
  • the exhausted air is expanded in chamber 28 and impinges radially and axially against the internal surface 30 thereof for penetration through the porous walls of the first baffle member 20 into the chamber 17 'of the cylindrical member 14 to penetrate through the sound absorbing material 32, as indicated by the flow arrows.
  • the initial sound level of the exhausted air, as it enters the expansion chamber 28, is first considerably reduced by being minutely broken up as the air penetrates through the porous walls of the first baffle member into the main chamber of the silencer. During penetration of the air through the sound absorbing material 32, the sound level is further reduced to a still lower value.
  • the air then travels through the sound absorbing material 32 towards the rear of the silencer for impingement upon the second, plate like baffle member 34 and penetration therethrough to the atmosphere.
  • the plate like exit baffle member 34 further breaks up the air fiow as it penetrates through the porous structure of the baffle member to thereby still further reduce the noise level as the air exits to the atmosphere.
  • FIGS. 3 and 4 the embodiment is substantially similar to the embodiment in FIGS. I and 2 and similar parts are identified by the same reference numerals.
  • the second outlet baffle member 34 has been replaced by a perforated plate 40 which, as seen in FIG. 4, is provided with a plurality of holes or apertures 42.
  • the perforated plate 40 is preferably made of aluminum and the sound absorbing material 32 in this instance is preferably an open cellurethane.
  • This silencer construction is particularly applicable for installation on air venturies which run on lowPSI but normally create soundsof annoying frequencies.
  • the improved silencers of the present invention as disclosed herein are particularly applicable to absorb sounds created by air flowing from a pipe such as through an exhaust valve and, depending on the selection of suitable material, to reduce other noises such as produced by air tools, combustion engines or the like.
  • the sintered bronze used must be of suitable density to provide a specified pressure drop per square inch for 1 cubic foot air passage per square inch, which, of course, varies with the individual application.
  • the present invention provides an improved, highly effective, air exhaust silencer of relatively simple structure which meets the requirements of the recently amended Walsh- Healey Act concerning occupational noise exposure and which specifies a maximum noise level of 90 decibels during any 8 hour period.
  • the present improved silencer is constructed to reduce the noise level of exhausted air, and particularly industrial air exhaust, to well below the required value by the provision of oppositely disposed, porous, gas permeable baffle members at both ends of an intermediate sound absorbing media to obtain multiple noise level reduction as the exhausted air travels through the silencer.
  • the exhausting ai r ma take on so much heat that the silencer attached to the air ou et will freeze solid.
  • additional units may have to be applied or, conversely, the silencer unit will have to be attached as close as possible to the air motor to permit the frictional heat of the working parts to be transmitted into the silencer to keep the cooling effect above the freezing point.
  • the present improved silencer structures has been tested to not exceed an allowable limit of dBA at psi air pressure with a minimum of back pressure within the silencer, in comparison to a similar length of standard pipe to which the silencer is attached.
  • the silencer ratings will be proportionately reduced. Since most industrial plants specify a pneumatic pressure range between 60 and 80 pounds, several silencers may be working at any one interval without producing a sound effect above the acceptable limits set by the provision of the Walsh-Healy Act, as mentioned above.
  • sintered bronze has been referred to in the illustrative embodiments of the invention, other materials which would be regarded as equivalent thereto include sintered steel, porous porcelain or stone or porous plastic materials.
  • a silencer comprising a housing having a chamber; a sound absorbing material disposed within said chamber; one end of said housing being connected to a source of exhausted air; a first baffle member disposed within said housing adjacent said one end; a second baffle member disposed within said housing adjacent the other end thereof; said first and said second baffle members being permeable to permit penetration of said exhausted air through said first bafile member into said chamber and through said sound abosrbing material for exit through said second baffle member to the atmosphere; said first baffle member being adapted to reduce the noise level of said exhausted air to a first value lower than the initial entering value; said sound absorbing material within said chamber being adapted to further reduce the noise level of said exhausted air to a second value lower than said first value; and said second baffle member being adapted to still further reduce the noise level of said exhausted air to a third value lower than said first and second value;
  • said first bafile member being formed in the shape of a trun cated cylindrical cone providing an internal gas expansion chamber aligned with said inlet and said second baffle member being fonned in the shape of a plate disposed across said other end of said housing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)
  • Incineration Of Waste (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US81051A 1970-10-15 1970-10-15 Gas exhaust silencer Expired - Lifetime US3672465A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8105170A 1970-10-15 1970-10-15

Publications (1)

Publication Number Publication Date
US3672465A true US3672465A (en) 1972-06-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US81051A Expired - Lifetime US3672465A (en) 1970-10-15 1970-10-15 Gas exhaust silencer

Country Status (5)

Country Link
US (1) US3672465A (enExample)
CA (1) CA924976A (enExample)
DE (1) DE2129981A1 (enExample)
FR (1) FR2109625A5 (enExample)
GB (2) GB1316037A (enExample)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960239A (en) * 1973-08-15 1976-06-01 Barry Wright Corporation Noise-reducing fluid-flow devices
US4316523A (en) * 1980-06-04 1982-02-23 Boretti Napoleon P Silencer for gas discharge devices
US5097924A (en) * 1988-06-08 1992-03-24 Mcneil (Ohio) Corporation Muffler for a compressed air driven motor
US5879031A (en) * 1997-04-23 1999-03-09 Carrier Corporation Sound baffle installation and retention device
WO2001014695A3 (en) * 1999-06-02 2002-01-24 3M Innovative Properties Co Muffler with acoustic barrier material for limited clearance pneumatic device applications
US20050051382A1 (en) * 2003-09-10 2005-03-10 Voss Automotive Gmbh: Pneumatic blow-off silencer
US20050103566A1 (en) * 1998-01-13 2005-05-19 Exhaust Technologies, Inc. Muffler for pneumatic hand tool
US20080029175A1 (en) * 2006-08-03 2008-02-07 Rolls-Royce Plc Fluid calming member
US20080099277A1 (en) * 2006-10-30 2008-05-01 Basso Industry Corp. Muffler for pneumatic tools
RU2391521C2 (ru) * 2008-04-17 2010-06-10 Общество с ограниченной ответственностью "Нейт" Глушитель шума газового потока (варианты)
US20100140015A1 (en) * 2007-05-09 2010-06-10 Stephan Weber Silencer
US20120205128A1 (en) * 2009-10-23 2012-08-16 Air Water Safety Service Inc. Gas fire-extinguishing apparatus
US20140373955A1 (en) * 2012-01-20 2014-12-25 Trojan Technologies Fluid flow modifier and fluid treatment system incorporating same
JP2015142854A (ja) * 2009-10-23 2015-08-06 エア・ウォーター防災株式会社 ガス消火設備
JP2016008604A (ja) * 2014-06-24 2016-01-18 筌誠機械股▲分▼有限公司 気動工具に用いる消音装置
DE102011018932B4 (de) 2011-04-28 2018-07-12 Multivac Sepp Haggenmüller Se & Co. Kg Schalldämpfvorrichtung und Verpackungsmaschine mit einer solchen Schalldämpfvorrichtung
CN111794974A (zh) * 2020-06-30 2020-10-20 南京智启嘉华水务科技有限公司 一种静音型智能多级泵
US20230038911A1 (en) * 2021-08-05 2023-02-09 Makita Corporation Air compressor
US20240139567A1 (en) * 2015-12-04 2024-05-02 Tyco Fire Products Lp Low pressure drop acoustic suppressor nozzle for inert gas discharge system
WO2025096038A1 (en) * 2023-10-31 2025-05-08 Centre Firearms Co., Inc. Suppression device with purposely induced porosity for firearm
US12523440B2 (en) 2023-07-27 2026-01-13 Centre Firearms Co., Inc. Monolithic noise suppression device with cooling features

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122914A (en) * 1976-04-30 1978-10-31 Nihon Radiator Co., Ltd. Muffler
DE2653262C2 (de) * 1976-11-24 1984-01-19 Werner Dr.-Ing. 3422 Bad Lauterberg Piening Vorrichtung zum geräuscharmen Entspannen eines gasförmigen Mediums mit Hilfe von Drosselstrecken
FR2570759B1 (fr) * 1984-09-26 1989-03-03 Maire Charles Ets Perfectionnements aux outils pneumatiques munis d'un silencieux d'echappement
DE3503780A1 (de) * 1985-02-05 1986-08-07 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Verfahren zur geraeuschdaemmung und gleichmaessigen luftverteilung in filtermedien
FR2628477B1 (fr) * 1988-03-11 1993-05-14 Bertin & Cie Silencieux ejecteur ou injecteur pour la detente d'un fluide gazeux et dispositif de soufflage equipe d'un ensemble de tels silencieux
RU2312233C2 (ru) * 2005-12-15 2007-12-10 Олег Савельевич Кочетов Аэродинамический глушитель кочетовых

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191309414A (en) * 1913-10-09 1914-03-26 William Bottomley An Improved Silencer Employed in connection with the Exhaust Ports of Internal Combustion Engines.
GB251210A (en) * 1926-01-11 1926-04-29 William Henry Graham Furnivall Improvements in and relating to exhaust silencers
US1839192A (en) * 1929-12-20 1932-01-05 Hudson Motor Car Co Muffler for internal combustion engines
US2019746A (en) * 1930-12-08 1935-11-05 Continental Motors Corp Muffler
US2392559A (en) * 1943-02-05 1946-01-08 Varma Dewan Chand Silencer for internal-combustion engines
US2499018A (en) * 1948-01-26 1950-02-28 Christiano Frank Baffle type muffler with plural tubular passages
US2576610A (en) * 1944-04-10 1951-11-27 Gen Motors Corp Restricter
FR1120954A (fr) * 1955-03-18 1956-07-18 Pot d'échappement à fonctions multiples
US2759556A (en) * 1952-08-04 1956-08-21 Bolt Beranek & Newman Acoustic method and system
GB808806A (en) * 1954-11-15 1959-02-11 Solomon Saunders Improvements in filters for use in removing noxious gases and solid matter contained in the exhaust gases of internal combustion engines
US3115209A (en) * 1960-05-11 1963-12-24 Edward A Bembinster Muffler
US3163256A (en) * 1962-06-06 1964-12-29 Corning Glass Works Muffler with ceramic honeycomb baffle
US3209857A (en) * 1964-02-12 1965-10-05 Oliver C Eckel Silencer with freely movable limp diaphragm
US3270834A (en) * 1965-09-10 1966-09-06 Atlas Copco Ab Pneumatic tool having exhaust noise reducing means
US3381774A (en) * 1967-07-10 1968-05-07 Mercury Metal Products Inc Muffler with interconnected end bells and telescoped inner pipe

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191309414A (en) * 1913-10-09 1914-03-26 William Bottomley An Improved Silencer Employed in connection with the Exhaust Ports of Internal Combustion Engines.
GB251210A (en) * 1926-01-11 1926-04-29 William Henry Graham Furnivall Improvements in and relating to exhaust silencers
US1839192A (en) * 1929-12-20 1932-01-05 Hudson Motor Car Co Muffler for internal combustion engines
US2019746A (en) * 1930-12-08 1935-11-05 Continental Motors Corp Muffler
US2392559A (en) * 1943-02-05 1946-01-08 Varma Dewan Chand Silencer for internal-combustion engines
US2576610A (en) * 1944-04-10 1951-11-27 Gen Motors Corp Restricter
US2499018A (en) * 1948-01-26 1950-02-28 Christiano Frank Baffle type muffler with plural tubular passages
US2759556A (en) * 1952-08-04 1956-08-21 Bolt Beranek & Newman Acoustic method and system
GB808806A (en) * 1954-11-15 1959-02-11 Solomon Saunders Improvements in filters for use in removing noxious gases and solid matter contained in the exhaust gases of internal combustion engines
FR1120954A (fr) * 1955-03-18 1956-07-18 Pot d'échappement à fonctions multiples
US3115209A (en) * 1960-05-11 1963-12-24 Edward A Bembinster Muffler
US3163256A (en) * 1962-06-06 1964-12-29 Corning Glass Works Muffler with ceramic honeycomb baffle
US3209857A (en) * 1964-02-12 1965-10-05 Oliver C Eckel Silencer with freely movable limp diaphragm
US3270834A (en) * 1965-09-10 1966-09-06 Atlas Copco Ab Pneumatic tool having exhaust noise reducing means
US3381774A (en) * 1967-07-10 1968-05-07 Mercury Metal Products Inc Muffler with interconnected end bells and telescoped inner pipe

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960239A (en) * 1973-08-15 1976-06-01 Barry Wright Corporation Noise-reducing fluid-flow devices
US4316523A (en) * 1980-06-04 1982-02-23 Boretti Napoleon P Silencer for gas discharge devices
US5097924A (en) * 1988-06-08 1992-03-24 Mcneil (Ohio) Corporation Muffler for a compressed air driven motor
US5879031A (en) * 1997-04-23 1999-03-09 Carrier Corporation Sound baffle installation and retention device
US20050103566A1 (en) * 1998-01-13 2005-05-19 Exhaust Technologies, Inc. Muffler for pneumatic hand tool
US7216739B2 (en) * 1998-01-13 2007-05-15 Exhaust Technologies, Inc. Muffler for pneumatic hand tool
WO2001014695A3 (en) * 1999-06-02 2002-01-24 3M Innovative Properties Co Muffler with acoustic barrier material for limited clearance pneumatic device applications
US20050051382A1 (en) * 2003-09-10 2005-03-10 Voss Automotive Gmbh: Pneumatic blow-off silencer
US9121305B2 (en) 2006-08-03 2015-09-01 Rolls-Royce Plc Fluid calming member
US20080029175A1 (en) * 2006-08-03 2008-02-07 Rolls-Royce Plc Fluid calming member
US20080099277A1 (en) * 2006-10-30 2008-05-01 Basso Industry Corp. Muffler for pneumatic tools
US20100140015A1 (en) * 2007-05-09 2010-06-10 Stephan Weber Silencer
US8191675B2 (en) * 2007-05-09 2012-06-05 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Silencer
RU2391521C2 (ru) * 2008-04-17 2010-06-10 Общество с ограниченной ответственностью "Нейт" Глушитель шума газового потока (варианты)
US9457214B2 (en) * 2009-10-23 2016-10-04 Air Water Safety Service Inc. Gas fire-extinguishing apparatus
JP2015192875A (ja) * 2009-10-23 2015-11-05 エア・ウォーター防災株式会社 設備室、ガス消火方法およびガス消火設備
JP2015198974A (ja) * 2009-10-23 2015-11-12 エア・ウォーター防災株式会社 消火ガス噴射装置
JP2015142854A (ja) * 2009-10-23 2015-08-06 エア・ウォーター防災株式会社 ガス消火設備
JP2016165496A (ja) * 2009-10-23 2016-09-15 エア・ウォーター防災株式会社 消火ガス噴射装置
US20120205128A1 (en) * 2009-10-23 2012-08-16 Air Water Safety Service Inc. Gas fire-extinguishing apparatus
EP3243552A3 (en) * 2009-10-23 2018-02-21 Air Water Safety Service Inc. Gas fire-extinguishing apparatus
DE102011018932B4 (de) 2011-04-28 2018-07-12 Multivac Sepp Haggenmüller Se & Co. Kg Schalldämpfvorrichtung und Verpackungsmaschine mit einer solchen Schalldämpfvorrichtung
US20140373955A1 (en) * 2012-01-20 2014-12-25 Trojan Technologies Fluid flow modifier and fluid treatment system incorporating same
US9771959B2 (en) * 2012-01-20 2017-09-26 Trojan Technologies Fluid flow modifier and fluid treatment system incorporating same
JP2016008604A (ja) * 2014-06-24 2016-01-18 筌誠機械股▲分▼有限公司 気動工具に用いる消音装置
US20240139567A1 (en) * 2015-12-04 2024-05-02 Tyco Fire Products Lp Low pressure drop acoustic suppressor nozzle for inert gas discharge system
CN111794974A (zh) * 2020-06-30 2020-10-20 南京智启嘉华水务科技有限公司 一种静音型智能多级泵
US20230038911A1 (en) * 2021-08-05 2023-02-09 Makita Corporation Air compressor
US11788526B2 (en) * 2021-08-05 2023-10-17 Makita Corporation Air compressor
US12523440B2 (en) 2023-07-27 2026-01-13 Centre Firearms Co., Inc. Monolithic noise suppression device with cooling features
WO2025096038A1 (en) * 2023-10-31 2025-05-08 Centre Firearms Co., Inc. Suppression device with purposely induced porosity for firearm

Also Published As

Publication number Publication date
FR2109625A5 (enExample) 1972-05-26
GB1317230A (en) 1973-05-16
GB1316037A (en) 1973-05-09
CA924976A (en) 1973-04-24
DE2129981A1 (de) 1972-04-20

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Owner name: ISI MANUFACTURING, INC., A MI CORP., MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BLATT, LELAND D. AND BLATT, ELAINE E., TRUSTEES OF THE L.F BLATT U/TA APRIL 12, 1977;REEL/FRAME:005002/0465

Effective date: 19880901