US3120876A - Air intake silencer - Google Patents

Air intake silencer Download PDF

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Publication number
US3120876A
US3120876A US107602A US10760261A US3120876A US 3120876 A US3120876 A US 3120876A US 107602 A US107602 A US 107602A US 10760261 A US10760261 A US 10760261A US 3120876 A US3120876 A US 3120876A
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inner cone
outer shell
cone member
silencer
base periphery
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US107602A
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Edward F Lirette
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1211—Flow throttling or guiding by using inserts in the air intake flow path, e.g. baffles, throttles or orifices; Flow guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/14—Combined air cleaners and silencers

Definitions

  • This invention relates to the attenuation of noise by the containment and harmless dissipation into heat of the acoustic energy generated by an offending machine. While this invention is specifically in connection with a neumatic blower supplying cooling air for use on air ground-support equipment, it is equally applicable to other equipment with comparable noise generating propensities. This invention is applicable to air and other gaseous fluid handling machines, the term gas being construed to include all non-solid and non-liquid mediums.
  • Noise emissions from machines may be merely annoying or they may be hazardous. Annoying or nuisance noise will produce no serious auditory effect although there may be physiological effect. However, this is not true of hazardous noise which will produce serious auditory effects including auditory or non-auditory physio logical reactions depending on the character of the noise.
  • the masked sounds will be limited to speech and the masking sounds will therefore refer to any other sounds which may interfere with the speech signals from a communications standpoint. It is apparent that any masking which would impair a communication channel in such manner as to adversely affect the receptability of orders, instructions and other vital information can lead to dire results.
  • Random noise such as generated by operating machinery is a more effective masker of speech than are pure tones at the same sound-pressure level. It is also known that low frequency noises have a greater masking effect than noises of high frequency.
  • the silencer embodied by this invention is of the absorptive type which is broadly tuned and maintains its effectiveness over a wide range of frequencies and operating speeds.
  • the object of this invention is to attenuate the noise emitting from pneumatic machinery such as blowers and the like by providing a suitable inlet silencer.
  • FIG. 1 is an end view of the silencer
  • FIG. 2 is a vertical sectional View on line 2-2 of FIG. 1.
  • the outer casing or shell 12 comprises a tubular casing member 14 to one end of which is welded or otherwise joined to an inlet ring 16.
  • a truncated cone member 18 has its larger diameter end welded or otherwise joined to the other end of easing member 14.
  • the smaller diameter of truncated cone member has welded or otherwise joined thereto a neck 20 to which is welded or otherwise joined to a mounting flange 22.
  • Mounting 3,120,870 Patented Feb. 11, 1964 flange 22 must be formed to fit the particular application of the silencer and the particular configuration used and does not constitute part of this invention.
  • Inner cone 24 is formed to substantially the same slope as the truncated cone 18 and is coaxially supported within the outer casing or shell 12 by means of studs 26 which may be welded or riveted in place and with its apex directed downstream in the air flow.
  • the inner cone is mounted in such longitudinal relationship with the outer casing or shell 12 as will produce the least impedence to flow through the silencer.
  • the outer or splitter cone 28 is substantially smaller than inner cone 24 and is spot welded or otherwise joined to inner cone 24 as shown with its apex directed upstream into the air flow.
  • the slope of outer cone 28 is such as will deflect impinging air and direct it toward the passageway between inlet ring 16 and inner cone 24.
  • the interior surface of the outer casing or shell 12 is lined with sound absorbing material 30 such as for example, Owens-Corning Fiberglass PF-335, which may be held in place with hardware cloth or other means known to the art.
  • sound absorbing material 32 is joined to the downstream side of inner cone 24.
  • the particular sound-absorbing material used or method of attachment form no part of this invention. Any suitable material may be used.
  • inflowing air will flow freely through the silencer which will at the same time attenuate and dissipate as heat, certain acoustic energy generated by the machine to which attached.
  • a gas inlet silencer comprising an outer shell member, an inner cone member coaxially mounted within said outer shell member and with apex directed downstream, gas passageway between the base periphery of said inner cone member and said outer shell member, an outer cone member with base periphery smaller than base periphery of said inner cone member, said outer cone member being coaxially mounted within said outer shell member and with apex directed upstream, all inside surfaces of said outer shell member and downstream surface of said inner cone member being lined with a layer of sound absorbing material.
  • a gas inlet silencer comprising an outer shell member, an inner cone member coaxially mounted within said outer shell member, a plurality of struts joining said inner cone member and said outer shell member, said inner cone member being mounted with apex directed downstream, gas passageway between the base periphery of said inner cone member and said outer shell member, an outer cone member with base periphery smaller than base periphery of said inner cone member, said outer cone member being coaxially mounted within said outer shell member with apex directed upstream, all inside surfaces of said outer shell member and downstream surface of said inner cone member being lined with a layer of sound absorbing material.
  • an inlet silencer comprising a tubular casing member, an inlet ring joined to one end of said tubular casing member, a truncated cone member joined to the other end of said casing member, a neck member joined to small periphery of said truncated cone, means joined to said neck member for attaching to said machinery, an inner cone member coaxially mounted within said tubular casing memher, a plurality of struts joining said truncated cone member and said inner cone member With apex directed downstream and providing an annular passageway between base periphery of said inner cone member and tubular casing member, means for directing inflowing air into said outer casing member, said means being a splitter cone coaxially mounted to said inner cone with its apex directed upstream, said splitter cone having a base periphery smaller than the base periphery of said inner cone, the inside surfaces of said tubular casing member, said inlet ring, said trunc

Description

Feb. 11, 1964 E. F. LIRETTE Y AIR INTAKE SILENCER Filed May 3, 1961 INVENTOR.
EDWARD F. LIRE TE BY M ATTORNEY United States Patent M 3,120,876 AIR INTAKE SILENCER Edward F. Lirette, Ann Arbor, Mich, assignor to the United States of America as represented by the Secretary of the Air Force Filed May 3, 1961, Ser. No. 107,602 3 Claims. (Cl. 181-50) This invention relates to the attenuation of noise by the containment and harmless dissipation into heat of the acoustic energy generated by an offending machine. While this invention is specifically in connection with a neumatic blower supplying cooling air for use on air ground-support equipment, it is equally applicable to other equipment with comparable noise generating propensities. This invention is applicable to air and other gaseous fluid handling machines, the term gas being construed to include all non-solid and non-liquid mediums.
Noise emissions from machines may be merely annoying or they may be hazardous. Annoying or nuisance noise will produce no serious auditory effect although there may be physiological effect. However, this is not true of hazardous noise which will produce serious auditory effects including auditory or non-auditory physio logical reactions depending on the character of the noise.
Among the consequences of hazardous noises are temporary or permanent loss of hearing and the masking of one sound by another.
The ability of the ear to hear two sounds at one time is a physiological phenomenon. However, this function, which provides for the discrimination between sounds, is subject to the effect of imposing one sound on another. This causes one of the sounds to become indistinct, or, as it may be said, auditory masking has occurred.
Connection with aircraft ground-support equipment, the masked sounds will be limited to speech and the masking sounds will therefore refer to any other sounds which may interfere with the speech signals from a communications standpoint. It is apparent that any masking which would impair a communication channel in such manner as to adversely affect the receptability of orders, instructions and other vital information can lead to dire results.
Random noise such as generated by operating machinery is a more effective masker of speech than are pure tones at the same sound-pressure level. It is also known that low frequency noises have a greater masking effect than noises of high frequency.
The silencer embodied by this invention is of the absorptive type which is broadly tuned and maintains its effectiveness over a wide range of frequencies and operating speeds.
The object of this invention is to attenuate the noise emitting from pneumatic machinery such as blowers and the like by providing a suitable inlet silencer.
Other objects will become more apparent from the following description of the invention as depicted by the drawings in which:
FIG. 1 is an end view of the silencer; and
FIG. 2 is a vertical sectional View on line 2-2 of FIG. 1.
Referring to the drawings which illustrate a preferred embodiment of the invention comprising a silencer removably secured to the inlet of a blower or like machine 8. The outer casing or shell 12 comprises a tubular casing member 14 to one end of which is welded or otherwise joined to an inlet ring 16. A truncated cone member 18 has its larger diameter end welded or otherwise joined to the other end of easing member 14. The smaller diameter of truncated cone member has welded or otherwise joined thereto a neck 20 to which is welded or otherwise joined to a mounting flange 22. Mounting 3,120,870 Patented Feb. 11, 1964 flange 22 must be formed to fit the particular application of the silencer and the particular configuration used and does not constitute part of this invention.
Inner cone 24 is formed to substantially the same slope as the truncated cone 18 and is coaxially supported within the outer casing or shell 12 by means of studs 26 which may be welded or riveted in place and with its apex directed downstream in the air flow. The inner cone is mounted in such longitudinal relationship with the outer casing or shell 12 as will produce the least impedence to flow through the silencer.
The outer or splitter cone 28 is substantially smaller than inner cone 24 and is spot welded or otherwise joined to inner cone 24 as shown with its apex directed upstream into the air flow. The slope of outer cone 28 is such as will deflect impinging air and direct it toward the passageway between inlet ring 16 and inner cone 24.
The interior surface of the outer casing or shell 12 is lined with sound absorbing material 30 such as for example, Owens-Corning Fiberglass PF-335, which may be held in place with hardware cloth or other means known to the art. Like sound absorbing material 32 is joined to the downstream side of inner cone 24.
The particular sound-absorbing material used or method of attachment form no part of this invention. Any suitable material may be used.
In operation, inflowing air will flow freely through the silencer which will at the same time attenuate and dissipate as heat, certain acoustic energy generated by the machine to which attached.
While the embodiment of this invention disclosed by the specification and drawings has taken a given form, it is obvious that modifications may be made as dictated by the requirements of the specific machine on which the invention is to be used.
I claim:
1. A gas inlet silencer comprising an outer shell member, an inner cone member coaxially mounted within said outer shell member and with apex directed downstream, gas passageway between the base periphery of said inner cone member and said outer shell member, an outer cone member with base periphery smaller than base periphery of said inner cone member, said outer cone member being coaxially mounted within said outer shell member and with apex directed upstream, all inside surfaces of said outer shell member and downstream surface of said inner cone member being lined with a layer of sound absorbing material.
2. A gas inlet silencer comprising an outer shell member, an inner cone member coaxially mounted within said outer shell member, a plurality of struts joining said inner cone member and said outer shell member, said inner cone member being mounted with apex directed downstream, gas passageway between the base periphery of said inner cone member and said outer shell member, an outer cone member with base periphery smaller than base periphery of said inner cone member, said outer cone member being coaxially mounted within said outer shell member with apex directed upstream, all inside surfaces of said outer shell member and downstream surface of said inner cone member being lined with a layer of sound absorbing material.
3. In pneumatic machinery and the like, an inlet silencer comprising a tubular casing member, an inlet ring joined to one end of said tubular casing member, a truncated cone member joined to the other end of said casing member, a neck member joined to small periphery of said truncated cone, means joined to said neck member for attaching to said machinery, an inner cone member coaxially mounted within said tubular casing memher, a plurality of struts joining said truncated cone member and said inner cone member With apex directed downstream and providing an annular passageway between base periphery of said inner cone member and tubular casing member, means for directing inflowing air into said outer casing member, said means being a splitter cone coaxially mounted to said inner cone with its apex directed upstream, said splitter cone having a base periphery smaller than the base periphery of said inner cone, the inside surfaces of said tubular casing member, said inlet ring, said truncated cone, said neck and the downstream side of said inner cone being lined with a layer of sound absorbing material.
UNITED STATES PATENTS Ricardo et a1. Nov. 13, 1917 Hamilton et a1. Oct. 7, 1930 Hamilton et al. June 14, 1931 Day Apr. 21, 1936 Lysholm et al. Oct. 18, 1955 Meyer June 28, 1960 Audette July 4, 1 961 FOREIGN PATENTS Great Britain Apr. 8, 1959 France Feb. 29, 1960

Claims (1)

1. A GAS INLET SILENCER COMPRISING AN OUTER SHELL MEMBER, AN INNER CONE MEMBER COAXIALLY MOUNTED WITHIN SAID OUTER SHELL MEMBER AND WITH APEX DIRECTED DOWNSTREAM, GAS PASSAGEWAY BETWEEN THE BASE PERIPHERY OF SAID INNER CONE MEMBER AND SAID OUTER SHELL MEMBER, AN OUTER CONE MEMBER WITH BASE PERIPHERY SMALLER THAN BASE PERIPHERY OF SAID INNER CONE MEMBER, SAID OUTER CONE MEMBER BEING COAXIALLY MOUNTED WITHIN SAID OUTER SHELL MEMBER AND WITH APEX DIRECTED UPSTREAM, ALL INSIDE SURFACES OF SAID OUTER SHELL MEMBER AND DOWNSTREAM SURFACE OF SAID INNER CONE MEMBER BEING LINED WITH A LAYER OF SOUND ABSORBING MATERIAL.
US107602A 1961-05-03 1961-05-03 Air intake silencer Expired - Lifetime US3120876A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2457399A1 (en) * 1979-05-23 1980-12-19 Citroen Sa Silencer for axial suction fan with radial feed pipe - has exponentially decreasing cross=section and is inclined to perpendicular to shaft to impart spiral trajectory on intake air
DE3230136A1 (en) * 1982-08-13 1984-02-16 Fichtel & Sachs Ag, 8720 Schweinfurt Air-intake stage for the combustion air fed to an internal-combustion engine
US4450933A (en) * 1982-09-24 1984-05-29 Kioritz Corporation Suction silencer
US4782912A (en) * 1987-03-18 1988-11-08 Ford Motor Company Engine air cleaner - noise reducer
US4887692A (en) * 1987-04-13 1989-12-19 Sanshin Kogyo Kabushiki Kaisha Noise reducing device for marine propulsion
BE1011631A3 (en) * 1997-12-19 1999-11-09 Atlas Copco Airpower Nv Fan with silencer and the silencer used for this
US5979013A (en) * 1998-03-10 1999-11-09 The Toro Company Portable blower with noise reduction
EP1004825A1 (en) * 1998-11-25 2000-05-31 Faber S.p.A. Device for silencing extractor hoods and the like
EP1015762A1 (en) * 1997-04-29 2000-07-05 Hill-Rom, Inc. Blower apparatus
EP1524360A1 (en) * 2003-10-17 2005-04-20 Electrolux Home Products Corporation N.V. Household clothes drying machine with muffled air intake
US20060071126A1 (en) * 2004-10-05 2006-04-06 Temeku Technologies, Inc. Multi-spectral air inlet shield and associated inlet structure
US7334662B1 (en) * 2005-08-11 2008-02-26 International Business Machines Corporation Equipment enclosure acoustical door with low impedance distributed air flow
US20100089357A1 (en) * 2008-10-15 2010-04-15 Gm Global Technology Operations, Inc. Noise attenuation for internal combustion engine
US20100089356A1 (en) * 2008-10-15 2010-04-15 Gm Global Technology Operations, Inc. Noise attenuation for internal combustion engine
WO2012089705A1 (en) * 2010-12-30 2012-07-05 Arcelik Anonim Sirketi A dryer comprising an air guide which directs the cooling air
US20140079569A1 (en) * 2011-06-09 2014-03-20 Koninklijke Philip N.V. Fan with sound-muffling box
EP3431746A1 (en) * 2017-07-19 2019-01-23 Honeywell International Inc. Acoustic damper with barrier member configured to dampen acoustic energy propogating upstream in gas flow
US11035384B2 (en) * 2018-04-25 2021-06-15 Sonny's Enterprises, Llc Silencer for an air blower assembly and air blower assembly having the silencer
US11227575B2 (en) * 2018-08-10 2022-01-18 Dell Products, L.P. Aerodynamic acoustic resonator to dissipate energy from air movers

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1246159A (en) * 1914-07-01 1917-11-13 Harry Ralph Ricardo Method of and apparatus for controlling the flow of fluids.
US1777522A (en) * 1928-08-01 1930-10-07 Francis F Hamilton Exhaust muffler
US1815005A (en) * 1928-12-05 1931-07-14 Francis F Hamilton Exhaust gas muffler
US2037884A (en) * 1932-11-11 1936-04-21 Burgess Lab Inc C F Silencer
US2720935A (en) * 1950-08-30 1955-10-18 Jarvis C Marble Silencing of sound
GB811612A (en) * 1956-07-27 1959-04-08 Sulzer Ag Rotary compressors
US2942683A (en) * 1953-06-01 1960-06-28 Phillips Petroleum Co Gas intake silencer
FR1226438A (en) * 1958-10-09 1960-07-11 Silencer for the flow of fluids
US2990906A (en) * 1958-10-08 1961-07-04 Koppers Co Inc Acoustic absorber

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1246159A (en) * 1914-07-01 1917-11-13 Harry Ralph Ricardo Method of and apparatus for controlling the flow of fluids.
US1777522A (en) * 1928-08-01 1930-10-07 Francis F Hamilton Exhaust muffler
US1815005A (en) * 1928-12-05 1931-07-14 Francis F Hamilton Exhaust gas muffler
US2037884A (en) * 1932-11-11 1936-04-21 Burgess Lab Inc C F Silencer
US2720935A (en) * 1950-08-30 1955-10-18 Jarvis C Marble Silencing of sound
US2942683A (en) * 1953-06-01 1960-06-28 Phillips Petroleum Co Gas intake silencer
GB811612A (en) * 1956-07-27 1959-04-08 Sulzer Ag Rotary compressors
US2990906A (en) * 1958-10-08 1961-07-04 Koppers Co Inc Acoustic absorber
FR1226438A (en) * 1958-10-09 1960-07-11 Silencer for the flow of fluids

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2457399A1 (en) * 1979-05-23 1980-12-19 Citroen Sa Silencer for axial suction fan with radial feed pipe - has exponentially decreasing cross=section and is inclined to perpendicular to shaft to impart spiral trajectory on intake air
DE3230136A1 (en) * 1982-08-13 1984-02-16 Fichtel & Sachs Ag, 8720 Schweinfurt Air-intake stage for the combustion air fed to an internal-combustion engine
US4450933A (en) * 1982-09-24 1984-05-29 Kioritz Corporation Suction silencer
US4782912A (en) * 1987-03-18 1988-11-08 Ford Motor Company Engine air cleaner - noise reducer
US4887692A (en) * 1987-04-13 1989-12-19 Sanshin Kogyo Kabushiki Kaisha Noise reducing device for marine propulsion
EP1015762A1 (en) * 1997-04-29 2000-07-05 Hill-Rom, Inc. Blower apparatus
EP1015762A4 (en) * 1997-04-29 2005-02-02 Hill Rom Co Inc Blower apparatus
BE1011631A3 (en) * 1997-12-19 1999-11-09 Atlas Copco Airpower Nv Fan with silencer and the silencer used for this
US5979013A (en) * 1998-03-10 1999-11-09 The Toro Company Portable blower with noise reduction
EP1004825A1 (en) * 1998-11-25 2000-05-31 Faber S.p.A. Device for silencing extractor hoods and the like
EP1524360A1 (en) * 2003-10-17 2005-04-20 Electrolux Home Products Corporation N.V. Household clothes drying machine with muffled air intake
US7159818B2 (en) * 2004-10-05 2007-01-09 Northrop Grumman Ship Systems, Inc. Multi-spectral air inlet shield and associated inlet structure
US20060071126A1 (en) * 2004-10-05 2006-04-06 Temeku Technologies, Inc. Multi-spectral air inlet shield and associated inlet structure
US7334662B1 (en) * 2005-08-11 2008-02-26 International Business Machines Corporation Equipment enclosure acoustical door with low impedance distributed air flow
US20100089357A1 (en) * 2008-10-15 2010-04-15 Gm Global Technology Operations, Inc. Noise attenuation for internal combustion engine
US20100089356A1 (en) * 2008-10-15 2010-04-15 Gm Global Technology Operations, Inc. Noise attenuation for internal combustion engine
US7707986B1 (en) 2008-10-15 2010-05-04 Gm Global Technology Operations, Inc. Noise attenuation for internal combustion engine
US7712447B2 (en) 2008-10-15 2010-05-11 Gm Global Technology Operations, Inc. Noise attenuation for internal combustion engine
WO2012089705A1 (en) * 2010-12-30 2012-07-05 Arcelik Anonim Sirketi A dryer comprising an air guide which directs the cooling air
US20140079569A1 (en) * 2011-06-09 2014-03-20 Koninklijke Philip N.V. Fan with sound-muffling box
US9458860B2 (en) * 2011-06-09 2016-10-04 Panasonic Intellectual Property Management Co., Ltd. Fan with sound-muffling box
EP3431746A1 (en) * 2017-07-19 2019-01-23 Honeywell International Inc. Acoustic damper with barrier member configured to dampen acoustic energy propogating upstream in gas flow
US20190024534A1 (en) * 2017-07-19 2019-01-24 Honeywell International Inc. Acoustic damper with barrier member configured to dampen acoustic energy propogating upstream in gas flow
US10533452B2 (en) 2017-07-19 2020-01-14 Garrett Transportation I Inc. Acoustic damper with barrier member configured to dampen acoustic energy propogating upstream in gas flow
EP4053393A1 (en) * 2017-07-19 2022-09-07 Garrett Transportation I Inc. Acoustic damper with barrier member configured to dampen acoustic energy propogating upstream in gas flow
US11035384B2 (en) * 2018-04-25 2021-06-15 Sonny's Enterprises, Llc Silencer for an air blower assembly and air blower assembly having the silencer
US11227575B2 (en) * 2018-08-10 2022-01-18 Dell Products, L.P. Aerodynamic acoustic resonator to dissipate energy from air movers

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