WO2010060482A1 - Conduit d'entrée d'air pour enveloppe de groupe générateur - Google Patents

Conduit d'entrée d'air pour enveloppe de groupe générateur Download PDF

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Publication number
WO2010060482A1
WO2010060482A1 PCT/EP2008/066304 EP2008066304W WO2010060482A1 WO 2010060482 A1 WO2010060482 A1 WO 2010060482A1 EP 2008066304 W EP2008066304 W EP 2008066304W WO 2010060482 A1 WO2010060482 A1 WO 2010060482A1
Authority
WO
WIPO (PCT)
Prior art keywords
baffle
sound
air inlet
inlet duct
slot
Prior art date
Application number
PCT/EP2008/066304
Other languages
English (en)
Inventor
Gary S. Kelly
Original Assignee
F.G. Wilson (Engineering) Ltd.
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 F.G. Wilson (Engineering) Ltd. filed Critical F.G. Wilson (Engineering) Ltd.
Priority to CN2008801326881A priority Critical patent/CN102292530A/zh
Priority to PCT/EP2008/066304 priority patent/WO2010060482A1/fr
Publication of WO2010060482A1 publication Critical patent/WO2010060482A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation

Definitions

  • This disclosure relates generally to enclosures for an engine-generator set. More particularly, the disclosure relates to the attenuation of sound emitted from the enclosure during operation of an engine-generator set.
  • An engine-generator or a genset may be a combination of an engine and a generator.
  • a genset may provide electricity at various locations such as construction sites or emergency response sites. Generally, a genset may provide electricity for apartments, office buildings, hotels and hospitals.
  • a genset may be a small person-portable device or a larger device that may be mounted on a skid or a trailer, depending on the requirements and location, and the amount of power that is needed for a particular use. Often, a genset may be mounted within an enclosure, such as a removable shroud or cover.
  • heat, from a genset may be dissipated by natural convection.
  • heat may be dissipated from an engine mounted radiator which may be cooled by air flowing through a compartment in the enclosure.
  • An air flow may be usually produced by a radiator fan.
  • the sound emission from the genset enclosure may need to be within the maximum sound limits in order to operate legally.
  • the enclosure may block or attenuate sound emanating from the engine or other genset components.
  • it may be necessary to provide openings within the enclosure for ventilation. Hence, sound may be emitted through the openings. To reduce sound emission through the openings, the number or size of openings in the compartment may be decreased.
  • the air flow may decrease to a level where the cooling effect may be also reduced, resulting in an increase in temperature within the enclosure. This may adversely affect temperature sensitive components, such as alternator, fuel injection system and various electronic components such as microprocessors.
  • a solution may be to increase the air flow by providing a fan which has a high rotational speed. However, the increase in fan speed may result in more noise being produced from the engine compartment.
  • Sound may also be reduced by lowering the fan speed or lowering engine output. However, such actions may decrease the overall efficiency of the machine. Sound dampers may be used to reduce or avoid the transmission of sound.
  • the genset enclosure may be lined with sound dampers, which may either absorb or reflect the noise.
  • the present disclosure is directed, at least in part, to improving or overcoming one or more aspects of the prior art system.
  • the present disclosure describes an air inlet duct for a genset enclosure comprising: a body having a slot and a front border; and a baffle supported in the body between the slot and the front border, wherein the body and the baffle are arranged in a sound path between a sound source and an inlet to reflect a sound transmitted along the sound path.
  • the present disclosure describes a method for reducing sound emission in a genset enclosure comprising: providing an air inlet duct having a body with a slot and a front border; positioning a baffle in the body between the slot and the front border; arranging the body and the baffle in a sound path between a sound source and an inlet to reflect a sound transmitted along the sound path.
  • Fig. 1 is a front isometric view of an air inlet duct according to the present disclosure
  • Fig. 2 is a rear isometric view of an air inlet duct according to the present disclosure
  • Fig. 3 is an top isometric view of a partially assembled genset enclosure including an air inlet duct according to the present disclosure.
  • Fig. 4 is a cross-section of the air inlet duct along the line Al - A2 of Fig.1 mounted to an inlet of a genset enclosure, according to the present disclosure.
  • FIG. 1 illustrates an air inlet duct 10 which may comprise a body 12, baffle 14 and a slot 16.
  • Body 12 may have a base member 18, side members 20 and an end member 22.
  • Base member 18 may have any suitable shape and may have any suitable dimensions to correspond with an inlet of a genset enclosure. In an embodiment, base member 18 may be formed as a rectangle.
  • Side members 20 may be formed as a trapezium, for instance a right-angled trapezium, and may be connected, through one the parallel edges, to the edges of base member 18. In an embodiment, the longitudinal edges of the base member 18 and the side members 20 may be connected. Side members 20 may be perpendicular relative to the base member 18. Side members 20 may have edges 24 which may be opposite and parallel to the edges connected to the base member 18.
  • Edges 24 may have mating elements 26.
  • Mating elements 26 may couple to corresponding mating elements in a genset enclosure.
  • mating elements 26 may be male projections that couple to corresponding female cavities in the genset enclosure.
  • mating elements 26 may be female cavities that couple to corresponding male projections in the genset enclosure.
  • End member 22 may be connected, through an edge, to the base member 18. End member 22 may be connected to the side members 20 through opposite edges, both of which may be adjacent to the edge connected to base member 18. The end member 18 may be connected to the slanting edges of the side members 20. End member 18 may have a free edge 28 and may be oblique relative to the base member 18. In an embodiment, end member 22 may be inclined in a direction away from the base member 18. End member 22 may be formed as a rectangle.
  • the body 12 may have an end border 30.
  • End border 30 may be formed by end edges of the base member 18 and the side members 20.
  • Adjacent end border 30 may be a front border 31.
  • Front border 31 may be fo ⁇ ned by the edges 24 of the side member 20 and free edge 28 of the end member 22.
  • Front border 31 may be formed by the mating elements 26 of the side member 20 and free edge 28 of the end member 22.
  • Body 12 may further have a channel 32.
  • Channel 32 may be formed by surfaces of the base member 18, the side members 20 and the end member 22. Depth of channel 32 may be equal to the width of the side member 20.
  • the depth of the channel 32 may be uniform along the base member 18, and may be the length between edge 24 and the surface of base member 18.
  • the depth of the channel 32 may be decrease along the end member 22 between the edge connecting to the base member 18 and the free edge 28, and may be the length between edge 24 and the surface of end member 22.
  • Baffle 14 may be positioned within channel 32.
  • baffle 14 may be centrally positioned in the channel 32 such that the longitudinal axes of the base member 18 and the baffle 14 may be aligned.
  • Baffle 14 may be equidistant from side members 20.
  • Baffle 14 may be supported in the channel 32 by a bracket 34 extending from a surface of the base member 18, the side members 20 or the end member 22.
  • the baffle 14 may be supported by two brackets 34.
  • brackets 34 extend from base member 18.
  • Brackets 34 may be mounted to a surface of the channel 34 and baffle 14 by mechanical coupling or chemical bonding. Brackets 34 may mounted to opposite ends of baffle 14.
  • Baffle 14 may be formed as a rectangle.
  • baffle 14 may be have a hollow structure.
  • Baffle 14 may have a length corresponding to the length of base member
  • length of baffle 14 may be less than the length of the base member 18.
  • baffle 14 may not extend beyond border 30. At the opposite end baffle 14 may not extend beyond the junction between body member 18 and end member 22.
  • Body 12 and baffle 14 may be formed with suitable materials.
  • body 12 and baffle 14 may be fo ⁇ ned with steel, for instance marine steel.
  • base member 18 may carry the slot 16.
  • Slot 16 may be defined by internal edges 36 of base member 18.
  • slot 16 may be centrally positioned on the base member 18 such that the longitudinal axes of the base member 18 and the slot 16 may be aligned.
  • Slot 16 may be equidistant from side members 20.
  • Channel 32 may communicate with space beyond base member 18 through slot 16.
  • Brackets 34 may be mounted at the gaps 38 within channel 32.
  • Baffle 14 may be positioned between the slot 16 and the front border 31 with the longitudinal axes of the front border 31, the slot 16 and the baffle 14 in parallel.
  • the baffle 14 may be offset relative to the slot 16.
  • the baffle 14 may be positioned such that the longitudinal axis of the baffle 14 may be positioned on either side of the longitudinal axis of the slot 16.
  • either the baffle 14 or the slot 16 may be centrally positioned relative to the base member 18.
  • Baffle 14 nay be mounted to brackets 34 and may extend over slot 16.
  • the dimension and position of slot 16 may be determined by dimension and position of baffle 14.
  • dimensions of baffle 14 may be greater than the dimensions of slot 16.
  • Sides of baffle 14 may overlap the internal edges 36 of base member 18 that define slot 16.
  • a partition may extend from a side of the baffle 14 to the surface of the base member 18.
  • vanes or strips may be positioned across slot 16 between edges 36.
  • a matrix or a grid may be positioned in the slot 16.
  • baffle 14 may be formed as a series of baffles.
  • the baffles may be inclined relative to the slot 16.
  • the baffles may be positioned such that the longitudinal axes may be parallel to the longitudinal axis of the slot 16.
  • the baffles may be positioned such that the longitudinal axes may be perpendicular to the longitudinal axis of the slot 16.
  • the baffles may be mounted over the slot 16 or mounted between internal edges 36.
  • a genset enclosure 40 may comprise an embodiment of the air inlet duct 10.
  • the enclosure 40 may be bound by walls 42.
  • the walls 42 may be of any suitable material and shape as required to contain the genset.
  • Walls 42 may have at least two openings to permit an airflow through the enclosure 40.
  • a first opening may be an inlet 44 and a second opening may be an outlet 46.
  • Inlet 44 and outlet 46 may allow the interior of the enclosure 40 to communicate with air space external thereto.
  • the openings may allow passage of air into and out of the enclosure 40.
  • the openings may be formed on any wall 42 or may be in any suitable position on the walls 42 of enclosure 40.
  • the openings may include a matrix or a grid of holes to prevent passage of objects larger than the size of the holes.
  • the inlet 44 and the outlet 46 may be formed on multiple adjacent walls 42, for instance an inlet 44 may be formed in a corner of the enclosure, which may be a junction of three walls 42.
  • the inlet 44 formed on a wall 42 may define a single plane.
  • An inlet 44 formed on multiple adjacent walls 42 may define multiple planes, each plane corresponding to a wall 42.
  • An air passage 48 may be formed within the interior of the enclosure 40 and may be enclosed by walls 42. Ambient air external the enclosure 40 may enter through inlet 44 flow through the interior of the enclosure 40 along the air passage 48 and may exit through outlet 46.
  • Air inlet duct 10 may be located within enclosure 40 in the air passage 48. Duct 10 may be positioned over inlet 44. In an embodiment, the front border 31 may form a periphery around the inlet 44 and the baffle 14 in the channel 32 may be between the slot 16 and the inlet 44 of the enclosure 10.
  • the air inlet duct 10 may be removably or rigidly mounted to a wall 42 at the inlet 44.
  • front border 31 may abut a wall 42 of the genset enclosure 40.
  • the front border 31 may form a sealing connection with wall 42.
  • border 30 may abut a wall 42 perpendicular to the wall 42 that abuts edges 24 of each side member 20 and the free edge 28 of end member 22. Border 30 may form a sealing connection with said wall 42.
  • channel 32 may communicate with air passage 48.
  • the enclosure 40 may be divided into portions or sections to receive the genset or components of a genset.
  • the sections or portions may be within the air passage 48 such that air flowing through the air passage 48 flows over the genset positioned within the sections or portions.
  • the gentset may comprise of an engine, a generator and a radiator for transfer of heat to the air flowing through the air passage 48.
  • the genset may comprise a fan, where rotation of the fan may draw air in through the inlet 44 and may force air out of through the outlet 46 thereby driving circulation of the air through the air passage 48.
  • a section or portion 50 of the enclosure 40 which may receive the engine/generator component may be adjacent to the inlet 44 or the plane of the inlet 44. In another embodiment the engine/generator section or portion 50 may be normal to the inlet 44 or the plane of the inlet 44. In the embodiment where the inlet 44 may be formed on multiple adjacent walls 14 the engine/generator section or portion 50 may be normal to at least one plane of the inlet 44.
  • a source of sound or noise in enclosure 40 may be components of the genset, for instance the engine and/or generator. Sound produced by engine and/or generator may be transmitted from the engine/ generator portion 50 along a sound path towards the inlet 44 and out to the area external the enclosure 40.
  • the sound path may be a route of sound, for instance a straight-line route, from the source, for instance the engine and/or generator, to a destination, for instance the inlet 44. Sound from the source may also be reflected off a wall 42 and travel towards inlet 44.
  • An air inlet duct 10 may be positioned in a sound path between the inlet 44 and the engine/ generator 50.
  • the baffle 14 within the air inlet duct 10 may be in the sound path.
  • Body 12 and baffle 14 may reflect the sound travelling along the sound path.
  • the body 12 and baffle 14 may prevent a direct transmission of sound from the source to the inlet 44.
  • body 12 and baffle 14 may reflect the sound travelling in the sound path into the channel 32 or into enclosure 40.
  • air inlet duct 10 may further have a lip 52 positioned along an internal edge 36 of the base member 18 that may part define the slot 16.
  • lips 52 may be mounted to the longitudinal internal edges 36.
  • Each lip 52 may extend along an entire longitudinal internal edge 36.
  • the lips 52 may be mounted by mechanical coupling or by chemical bonding.
  • a radiator fan may circulate air through the air passage 48.
  • Ambient air external to the enclosure 40 may flow through inlet 44. Air flow through air inlet duct 10 may be depicted by solid arrows 54. Ambient air entering through inlet 44 may flow into channel 32 of duct 10. Air may flow around baffle 14 and may flow out of channel 32 through slot 16. Air exiting slot 16 may enter air passage 48. Air may flow through the air passage 48 and over a radiator which may transfer heat to the flowing air. Heated air may flow from the radiator through the outlet 46 and out from the enclosure 40.
  • Sound produced from the engine and/ or generator or reflected of a wall 42 may be transmitted towards the inlet 44.
  • Base member 18 may reflect part of the transmitted sound through the air passage 48 towards inlet 44. Sound may be transmitted through slot 16 and into channel 32.
  • Fig. 4 illustrates the sound entering the channel 32 by arrows with broken lines 56.
  • Baffle 14 may be positioned in the channel 32 between the slot 16 and the inlet 44 of the enclosure 10. Baffle 14 may reflect sound transmitted through slot 16. Sound transmitted beyond the edges of baffle 14 may be reflected by the side members 20. Emission of sound produced by the engine and/ or generator may be restricted by the air inlet duct 10, during operation thereof.
  • Lips 52 may capture water droplets or other contaminants earned by the air entering channel 32. Captured water droplets may slide along the lips 52 and may land onto end member 22. The inclined end member 22 may allow the water to drain out of the duct 10.
  • Various surfaces of the air inlet duct 10 may be lined with sound absorbing foam to prevent noise reflecting from the surfaces of the air inlet duct 10 and out through the inlet grill 44.
  • Such surfaces may be side walls 20, base member 18, baffle 14 and end member 22.
  • This disclosure describes an air inlet duct 10 for controlling sound transmission from a sound source to areas external to the genset enclosure 40 and for controlling entry of contaminants into the enclosure 40.
  • the air inlet duct 10 may reflect sound from a source away from an inlet 44 of an enclosure 40.
  • the air inlet duct 10 may reflect sound travelling along a transmission sound path from the sound source to the inlet 44 and may allow ventilation of the enclosure 40 and cooling of the radiator by the air flow through air passage 48.
  • the air inlet duct 10 according to the present disclosure may be suitable for genset enclosures.
  • references signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, neither the reference signs nor their absence have any limiting effect on the technical features as described above or on the scope of any claim elements.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Duct Arrangements (AREA)

Abstract

L'invention porte sur un conduit d'entrée d'air pour une enveloppe de groupe générateur, lequel conduit comprend : un corps ayant une fente et une bordure avant ; et un écran acoustique supporté dans le corps entre la fente et la bordure avant, le corps et l'écran acoustique étant disposés dans un trajet de son entre une source de son et une entrée pour réfléchir un son transmis le long du trajet de son. L'invention porte également sur un procédé pour réduire l'émission sonore dans une enveloppe de groupe générateur, le procédé comprenant : la disposition d'un conduit d'entrée d'air ayant un corps avec une fente et une bordure avant ; le positionnement d'un écran acoustique dans le corps entre la fente et la bordure avant ; la disposition du corps et de l'écran acoustique dans un trajet de son entre une source de son et une entrée pour réfléchir un son transmis le long du trajet de son.
PCT/EP2008/066304 2008-11-27 2008-11-27 Conduit d'entrée d'air pour enveloppe de groupe générateur WO2010060482A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2008801326881A CN102292530A (zh) 2008-11-27 2008-11-27 用于发电机组封罩的进气道
PCT/EP2008/066304 WO2010060482A1 (fr) 2008-11-27 2008-11-27 Conduit d'entrée d'air pour enveloppe de groupe générateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/066304 WO2010060482A1 (fr) 2008-11-27 2008-11-27 Conduit d'entrée d'air pour enveloppe de groupe générateur

Publications (1)

Publication Number Publication Date
WO2010060482A1 true WO2010060482A1 (fr) 2010-06-03

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ID=40873396

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/066304 WO2010060482A1 (fr) 2008-11-27 2008-11-27 Conduit d'entrée d'air pour enveloppe de groupe générateur

Country Status (2)

Country Link
CN (1) CN102292530A (fr)
WO (1) WO2010060482A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011128450A1 (fr) * 2010-04-16 2011-10-20 Sdmo Industries Groupe électrogène compact
JP2012002119A (ja) * 2010-06-16 2012-01-05 Aisin Seiki Co Ltd 屋外設置型発電装置
US20130147203A1 (en) * 2011-12-12 2013-06-13 Daniel D. Gillett Generator set assembly with baffle
US8601772B2 (en) 2010-05-05 2013-12-10 Cummins Power Generation Ip, Inc. Genset enclosure
US8872361B2 (en) 2012-01-25 2014-10-28 Briggs & Stratton Corporation Standby generators including compressed fiberglass components
US9641043B1 (en) 2015-03-27 2017-05-02 Timothy David Leedy Portable sound attenuating device and related methods
CN107246318A (zh) * 2017-06-27 2017-10-13 雅柯斯电力科技（中国）有限公司 发电机组降噪罩
US10309302B2 (en) 2016-03-09 2019-06-04 Kohler Co. Noise suppression system
US11591977B2 (en) 2020-06-03 2023-02-28 Briggs & Stratton, Llc Inverter generator
US11705779B2 (en) 2020-06-03 2023-07-18 Briggs & Stratton, Llc Inverter generator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000110579A (ja) * 1998-10-06 2000-04-18 Yanmar Diesel Engine Co Ltd エンジン作業機のパッケージにおける駆動音低減装置
JP2001355445A (ja) * 2000-06-12 2001-12-26 Hokuetsu Kogyo Co Ltd エンジン作業機の冷却構造
JP2002070571A (ja) * 2000-08-28 2002-03-08 Mitsui Zosen Machinery & Service Inc 自家発電装置
JP2003020955A (ja) * 2001-07-10 2003-01-24 Yanmar Co Ltd 防音型発電装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000110579A (ja) * 1998-10-06 2000-04-18 Yanmar Diesel Engine Co Ltd エンジン作業機のパッケージにおける駆動音低減装置
JP2001355445A (ja) * 2000-06-12 2001-12-26 Hokuetsu Kogyo Co Ltd エンジン作業機の冷却構造
JP2002070571A (ja) * 2000-08-28 2002-03-08 Mitsui Zosen Machinery & Service Inc 自家発電装置
JP2003020955A (ja) * 2001-07-10 2003-01-24 Yanmar Co Ltd 防音型発電装置

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011128450A1 (fr) * 2010-04-16 2011-10-20 Sdmo Industries Groupe électrogène compact
FR2958973A1 (fr) * 2010-04-16 2011-10-21 Sdmo Ind Groupe electrogene compact
US9562456B2 (en) 2010-05-05 2017-02-07 Cummins Power Generation Ip, Inc. Exhaust injection muffler
US8601772B2 (en) 2010-05-05 2013-12-10 Cummins Power Generation Ip, Inc. Genset enclosure
US8769940B2 (en) 2010-05-05 2014-07-08 Cummins Power Generation Ip, Inc. Marine exhaust catalyst
US8839611B2 (en) 2010-05-05 2014-09-23 Cummins Power Generation Ip, Inc Exhaust injection muffler
JP2012002119A (ja) * 2010-06-16 2012-01-05 Aisin Seiki Co Ltd 屋外設置型発電装置
EP2397666A3 (fr) * 2010-06-16 2012-08-22 Aisin Seiki Kabushiki Kaisha Appareil de génération d'alimentation externe
US8593003B2 (en) 2010-06-16 2013-11-26 Aisin Seiki Kabushiki Kaisha Outdoor power generating apparatus
US9252640B2 (en) 2011-12-12 2016-02-02 Cummins Power Generation Ip, Inc. Generator set assembly with baffle
US20130147203A1 (en) * 2011-12-12 2013-06-13 Daniel D. Gillett Generator set assembly with baffle
US20150061296A1 (en) * 2011-12-12 2015-03-05 Cummins Power Generation Ip, Inc. Generator set assembly with baffle
US8881694B2 (en) * 2011-12-12 2014-11-11 Cummins Power Generation Ip, Inc. Generator set assembly with baffle
US9755480B2 (en) 2012-01-25 2017-09-05 Briggs & Stratton Corporation Standby generator including enclosure with intake opening in rear wall and exhaust opening in front wall
US9431865B2 (en) 2012-01-25 2016-08-30 Briggs & Stratton Corporation Standby generator with removable panel
US8872361B2 (en) 2012-01-25 2014-10-28 Briggs & Stratton Corporation Standby generators including compressed fiberglass components
US10044243B2 (en) 2012-01-25 2018-08-07 Briggs & Stratton Corporation Standby generator with air intake on rear wall and exhaust opening on front wall
US10181770B2 (en) 2012-01-25 2019-01-15 Briggs & Stratton Corporation Standby generator with air intake on rear wall and exhaust opening on front wall
US9641043B1 (en) 2015-03-27 2017-05-02 Timothy David Leedy Portable sound attenuating device and related methods
US10084358B1 (en) 2015-03-27 2018-09-25 Zombiebox International Llc Portable sound attenuating device and related methods
US10309302B2 (en) 2016-03-09 2019-06-04 Kohler Co. Noise suppression system
CN107246318A (zh) * 2017-06-27 2017-10-13 雅柯斯电力科技（中国）有限公司 发电机组降噪罩
US11591977B2 (en) 2020-06-03 2023-02-28 Briggs & Stratton, Llc Inverter generator
US11705779B2 (en) 2020-06-03 2023-07-18 Briggs & Stratton, Llc Inverter generator

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