US3779341A - Noise suppressive fan shroud - Google Patents

Noise suppressive fan shroud Download PDF

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Publication number
US3779341A
US3779341A US00297994A US3779341DA US3779341A US 3779341 A US3779341 A US 3779341A US 00297994 A US00297994 A US 00297994A US 3779341D A US3779341D A US 3779341DA US 3779341 A US3779341 A US 3779341A
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Prior art keywords
fan
heat exchanger
baffles
axis
noise
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Expired - Lifetime
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US00297994A
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H Huggins
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Modine Manufacturing Co
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Modine Manufacturing Co
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • 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

Definitions

  • a rotating fan having blades rotatable about an axis is a source of considerable noise particularly where the cooling capacity of the fan is large as in cooling fans for heavy duty truck radiators.
  • the fan structure of this invention is noise suppressive whether the fan is used in conjunction with such an air cooled heat exchanger or used merely as an air moving device in general cooling.
  • the noise suppressive fan structure of this invention comprises a fan having blades rotatable about an axis and shrouds on opposite sides of the fan each comprising closely spaced baffles comprising sound deadening material with the baffles being positioned essentially edgewise to the plane of rotation of the fan and the baffles each being curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereby without interferring with the volumetric air flow through the fan.
  • the fan structure When the fan structure is used as an element in a combination including an air permeable heat exchanger the fan proper is located on one side of the heat exchanger and on the side of the fan opposite the heat exchanger one of the shrouds is provided. In the preferred structure, however, there is provided a similar shroud in the area between the heat exchanger and the fan preferably.
  • the fan and shroud or shrouds are enclosed within a generally tubular air conduit housing that is open atits opposite ends.
  • the tubular housing may be attached at one end to the heat exchanger.
  • the housing as well as the baffles are coaxial with the axis of rotation of the fan.
  • FIG. I there is disclosed a heat exchanger 10 comprising a customary fin and tube air permeable core 11 with the tubes (not shown) thereof interconnecting an upper tank 12 and a lower tank 13 all in the customary manner.
  • an air cooling fan 14 Positioned to one side of the core 11 is an air cooling fan 14 comprising blades 15 mounted for rotation on a drive shaft 16 which is rotatable about a central axis.
  • shrouds 17 and 18 Positioned on opposite sides of the fan 14 are shrouds 17 and 18 comprising closely spaced baffles 19 comprising sound absorbing material.
  • the baffles 19 are essentially edgewise to the fan, are curvilinear and are spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan 14 during rotation thereof and thereby preventing straight line projection of noise in the spaces 20 between adjacent baffles 19.
  • the baffles 19 of the embodiment of FIG. 1 are generally circular and are held rigidly in spaced relation by struts such as illustrated by the struts 21 in the embodiment of FIGS. 2 and 3. These struts are generally radial and are flat strips arranged edgewise to the direction of air flow.
  • baffles 19 which in the illustrated embodiments are circular and substantially coaxial to the axis of rotation of the fan 14 and drive shaft 16 are enclosed by a tubular housing 22 that is open at both ends.
  • a tubular housing 22 that is open at both ends.
  • one end 23 of the housing is connected to the heat exchanger 10 so as to receive substantially all of the air 24 drawn through the core 11 by the rotating fan.
  • the opposite end 25 of the housing is open for and unrestricted air flow.
  • the individual baffles 19 are angular in cross section as illustrated and thereby provide a herringbone effect when shown in the section of FIG. 1.
  • the baffles 25 are generally sinusoidal but also provide a substantially complete shadow to the sound waves from the rotating fan which generally travel in straight lines parallel to the axis of rotation of the fan.
  • the curvilinear baffles 26 are located on one side only of the fan 14 which is the side opposite to the core 11. This structure can be used where cost is a factor, as the air permeable core 1 1 itself serves as a noise suppressive unit to a certain extent. However, for maximum suppression of noise it is preferred that the baffle structures be positioned on both sides of the fan.
  • the noise suppressive fan structure may be used as an ordinary air blower but is preferably used with the high speed fans used to cool radiators particularly for heavy duty devices such as trucks, earth moving equipment of other such structures where noise is a serious problem. It can of course be used to advantage to produce quiet unit heaters or any other heat exchanger device or structure with which the fan shroud of this invention may be associated.
  • the shrouds In addition to suppressing noise the shrouds have the secondary effect of converting velocity rotation of air caused by the fan to linear velocity thereby providing better air distribution over the external surfaces of the heat exchanger such as the radiator core 1 1. This latter effect is especially important when the air is being pushed through the radiator as from right to left in FIG. 1 rather than being pulled through as illustrated by the arrows 24 of FIG. 1.
  • the baffles 25 of the shroud may be made of any sound absorbing material.
  • one structure is to construct the baffles of sheet metal as illustrated at 27 in FIG. 3 and to coat them with a synthetic plastic sound absorbing material 28 such as cellular polyurethane.
  • the entire baffles themselves may be made of a cellular synthetic material that is rigid and strong enough to resist breakagel
  • the supporting struts 21 used to support the shrouds and maintain the baffles in spaced relation also contribute to straightening out the air flow from the rotating fan 14 as shown in the illustrated embodiments.
  • the struts that radiate from the axis of rotation 29 are flat and arranged edgewise to the rotating fan 14.
  • a heat exchanger structure comprising: an air permeable heat exchanger; a fan on one side of said heat exchanger having blades rotatable about an axis; shrouds on the opposite sides of said fan each comprising circularly closely spaced baffles substantially coaxial-with said fan axis and each comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces substantially coaxial with said fan axis comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces between adjacent baffles; and a tubular housing open at opposite ends and enclosing said fan and baffles, said housing being attached at one end to said heat exchanger and being coaxial with said

Abstract

A noise suppressive fan structure and a heat exchanger having on one side thereof the fan structure in which the fan structure comprises a fan having blades rotatable about an axis and shrouds adjacent the fan comprising closely spaced sound absorbing baffles that are curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan. Where the fan structure is used in conjunction with an air permeable heat exchanger the shroud may be on the side of the fan opposite the heat exchanger.

Description

United States Patent [191 Huggins Dec. 18, 1973 NOISE SUPPRESSIVE FAN SHROUD Inventor: Homer D. Huggins, Racine, Wis.
Modine Manufacturing Company, Racine, Wis.
Filed: Oct. 16, 1972 Appl. No.: 297,994
Assignee:
U.S. C1. 181/50, 181/49, 181/33 M, 165/59 [581 Field of Search 165/87, 98, 107,
33 AB, 33 M, 36 R, 49, 50, 55, 63; 415/119, 200, 185,205, 210, 217
References Cited 7 UNITED STATES PATENTS 8/1956 Baruch ..181/5O 8/1956 Baruch 181/50 Int. Cl. FOln l/10, FOln l/24 Sargent 165/59 Arnhym 415/119 Primary ExaminerRichard B. Wilkinson Assistant Examiner-Vit W. Miska AlmrneyAxel A. Hofgren et a1.
[ 5 7 ABSTRACT 2 Claims, 4 Drawing Figures NOISE SUPPRESSIVE FAN SIIROUD BACKGROUND OF THE INVENTION A rotating fan having blades rotatable about an axis is a source of considerable noise particularly where the cooling capacity of the fan is large as in cooling fans for heavy duty truck radiators. The fan structure of this invention is noise suppressive whether the fan is used in conjunction with such an air cooled heat exchanger or used merely as an air moving device in general cooling.
SUMMARY OF THE INVENTION The noise suppressive fan structure of this invention comprises a fan having blades rotatable about an axis and shrouds on opposite sides of the fan each comprising closely spaced baffles comprising sound deadening material with the baffles being positioned essentially edgewise to the plane of rotation of the fan and the baffles each being curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereby without interferring with the volumetric air flow through the fan.
When the fan structure is used as an element in a combination including an air permeable heat exchanger the fan proper is located on one side of the heat exchanger and on the side of the fan opposite the heat exchanger one of the shrouds is provided. In the preferred structure, however, there is provided a similar shroud in the area between the heat exchanger and the fan preferably.
In a still more preferred structure the fan and shroud or shrouds are enclosed within a generally tubular air conduit housing that is open atits opposite ends.
Where the noise suppressive fan structure is used in the combination with the air permeable heat exchanger the tubular housing may be attached at one end to the heat exchanger. Preferably the housing as well as the baffles are coaxial with the axis of rotation of the fan.
BRIEF DESRIPTION OF THE DRAWINGS DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of FIG. I there is disclosed a heat exchanger 10 comprising a customary fin and tube air permeable core 11 with the tubes (not shown) thereof interconnecting an upper tank 12 and a lower tank 13 all in the customary manner.
Positioned to one side of the core 11 is an air cooling fan 14 comprising blades 15 mounted for rotation on a drive shaft 16 which is rotatable about a central axis.-
Positioned on opposite sides of the fan 14 are shrouds 17 and 18 comprising closely spaced baffles 19 comprising sound absorbing material.
The baffles 19 are essentially edgewise to the fan, are curvilinear and are spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan 14 during rotation thereof and thereby preventing straight line projection of noise in the spaces 20 between adjacent baffles 19. Thus, as can be seen in both FIG. 1 and the enlarged embodiment of FIG. 3, it is impossible to draw a horizontal line between adjacent baffles without intersecting at least one baffle. This means that the straight line projection of noise from the rotating fan which is the source of fan noise will be blocked by at least one bafi'le.
The baffles 19 of the embodiment of FIG. 1 are generally circular and are held rigidly in spaced relation by struts such as illustrated by the struts 21 in the embodiment of FIGS. 2 and 3. These struts are generally radial and are flat strips arranged edgewise to the direction of air flow.
The baffles 19 which in the illustrated embodiments are circular and substantially coaxial to the axis of rotation of the fan 14 and drive shaft 16 are enclosed by a tubular housing 22 that is open at both ends. Thus as illustrated in FIG. 1 one end 23 of the housing is connected to the heat exchanger 10 so as to receive substantially all of the air 24 drawn through the core 11 by the rotating fan. The opposite end 25 of the housing is open for and unrestricted air flow.
In the embodiment of FIG. 1 the individual baffles 19 are angular in cross section as illustrated and thereby provide a herringbone effect when shown in the section of FIG. 1.
In the embodiment of FIGS. 2 and 3 the baffles 25 are generally sinusoidal but also provide a substantially complete shadow to the sound waves from the rotating fan which generally travel in straight lines parallel to the axis of rotation of the fan. In the embodiment of FIG. 4 the curvilinear baffles 26 are located on one side only of the fan 14 which is the side opposite to the core 11. This structure can be used where cost is a factor, as the air permeable core 1 1 itself serves as a noise suppressive unit to a certain extent. However, for maximum suppression of noise it is preferred that the baffle structures be positioned on both sides of the fan.
The noise suppressive fan structure may be used as an ordinary air blower but is preferably used with the high speed fans used to cool radiators particularly for heavy duty devices such as trucks, earth moving equipment of other such structures where noise is a serious problem. It can of course be used to advantage to produce quiet unit heaters or any other heat exchanger device or structure with which the fan shroud of this invention may be associated.
In addition to suppressing noise the shrouds have the secondary effect of converting velocity rotation of air caused by the fan to linear velocity thereby providing better air distribution over the external surfaces of the heat exchanger such as the radiator core 1 1. This latter effect is especially important when the air is being pushed through the radiator as from right to left in FIG. 1 rather than being pulled through as illustrated by the arrows 24 of FIG. 1.
The baffles 25 of the shroud may be made of any sound absorbing material. Thus one structure is to construct the baffles of sheet metal as illustrated at 27 in FIG. 3 and to coat them with a synthetic plastic sound absorbing material 28 such as cellular polyurethane. If desired, the entire baffles themselves may be made of a cellular synthetic material that is rigid and strong enough to resist breakagel The supporting struts 21 used to support the shrouds and maintain the baffles in spaced relation also contribute to straightening out the air flow from the rotating fan 14 as shown in the illustrated embodiments. As explained earlier, in the preferred structure as shown in FIG. 2 the struts that radiate from the axis of rotation 29 are flat and arranged edgewise to the rotating fan 14.
I claim:
1. A heat exchanger structure, comprising: an air permeable heat exchanger; a fan on one side of said heat exchanger having blades rotatable about an axis; shrouds on the opposite sides of said fan each comprising circularly closely spaced baffles substantially coaxial-with said fan axis and each comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces substantially coaxial with said fan axis comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces between adjacent baffles; and a tubular housing open at opposite ends and enclosing said fan and baffles, said housing being attached at one end to said heat exchanger and being coaxial with said fan aXlS.

Claims (2)

1. A heat exchanger structure, comprising: an air permeable heat exchanger; a fan on one side of said heat exchanger having blades rotatable about an axis; shrouds on the opposite sides of said fan each comprising circularly closely spaced baffles substantially coaxial with said fan axis and each comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces between adjacent baffles; and a tubular housing open at opposite ends and enclosing said fan and baffles, said housing being attached at one end to said heat exchanger and being coaxial with said fan axis.
2. A heat exchanger structure, comprising: an air permeable finned heat exchanger also functioning as a sound absorbing shroud; a fan on one side of said heat exchanger having blades rotatable about an axis; a shroud on the side of said fan opposite the heat exchanger comprising circularly closely spaced baffles substantially coaxial with said fan axis comprising sound absorbing material, said baffles being essentially edgewise to said fan, curvilinear, spaced apart and nested to provide a substantially complete shadow to the sound waves from the fan during rotation thereof and thereby prevent straight line projection of noise in the spaces between adjacent baffles; and a tubular housing open at opposite ends and enclosing said fan and baffles, said housing being attached at one end to said heat exchanger and being coaxial with said fan axis.
US00297994A 1972-10-16 1972-10-16 Noise suppressive fan shroud Expired - Lifetime US3779341A (en)

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857453A (en) * 1974-02-21 1974-12-31 Caterpillar Tractor Co Noise suppression means for tractors
JPS50103034U (en) * 1974-01-28 1975-08-25
US3970161A (en) * 1974-07-31 1976-07-20 International Harvester Company Motor vehicle
JPS51139836U (en) * 1975-05-02 1976-11-11
FR2309717A1 (en) * 1975-04-28 1976-11-26 Komatsu Mfg Co Ltd ENGINE RADIATOR INCLUDING A NOISE REDUCTION DEVICE
US4169501A (en) * 1976-12-02 1979-10-02 Kabushiki Kaisha Komatsu Seisakusho Airflow regulating apparatus for radiator
US4345341A (en) * 1980-04-25 1982-08-24 Kimura Bed Mfg. Company Limited Vacuum suction type urinating aid
US4596921A (en) * 1984-05-22 1986-06-24 Hersh Alan S Low noise hand-held hairdryer
US4662818A (en) * 1983-07-23 1987-05-05 International Standard Electric Corporation Tangential blower
US4750860A (en) * 1986-06-30 1988-06-14 Tandem Computers Incorporated Fan
US5000079A (en) * 1990-05-17 1991-03-19 Mardis Michael C Noise-attenuating ventilation pedestal for an electronic enclosure
US5024267A (en) * 1989-06-28 1991-06-18 Aisin Kako Kabushiki Kaisha Cooling apparatus for heat exchanger
BE1011631A3 (en) * 1997-12-19 1999-11-09 Atlas Copco Airpower Nv Fan with silencer and the silencer used for this
US6123051A (en) * 1998-08-12 2000-09-26 Chrysler Corporation Shroud for an engine cooling fan
US6471472B1 (en) 2000-05-03 2002-10-29 Siemens Canada Limited Turbomachine shroud fibrous tip seal
US20070034444A1 (en) * 2005-08-15 2007-02-15 Mk Seiko Co., Ltd. Reflecting plate type silencer pipe
US20070187163A1 (en) * 2006-02-10 2007-08-16 Deere And Company Noise reducing side shields
US20090211253A1 (en) * 2005-06-16 2009-08-27 Utc Power Corporation Organic Rankine Cycle Mechanically and Thermally Coupled to an Engine Driving a Common Load
US20100018798A1 (en) * 2008-07-22 2010-01-28 Volvo Construction Equipment Holding Sweden Ab Noise silencer for construction equipment
US20110189019A1 (en) * 2010-02-01 2011-08-04 Jason Scot Richardson Shroud for rotating machine component
US20120097479A1 (en) * 2008-11-27 2012-04-26 Kelly Gary S Baffle Arrangement for a Genset Enclosure
US20140102675A1 (en) * 2012-10-15 2014-04-17 Caterpillar Inc. Fan shroud
US20140366815A1 (en) * 2011-10-31 2014-12-18 Chenfei Lu Air heat exchanger
USD764652S1 (en) * 2014-01-06 2016-08-23 Ebm-Papst Mulfingen Gmbh & Co. Kg Diffuser grid
US20180166057A1 (en) * 2016-12-14 2018-06-14 Samsung Electronics Co., Ltd. Electronic device with soundproof structure
US11289064B2 (en) * 2018-12-31 2022-03-29 Dell Products L.P. Systems and methods for vibrational and acoustic damping with baffle structure
US20220366887A1 (en) * 2019-09-03 2022-11-17 3M Innovative Properties Company Assembly including acoustic baffles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1916907A (en) * 1933-02-15 1933-07-04 Don A Sargent Ventilating and air-conditioning apparatus
US2415621A (en) * 1944-10-20 1947-02-11 Solar Aircraft Co Fan
US2759555A (en) * 1952-07-21 1956-08-21 Bolt Beranek & Newman Acoustic method and system
US2759556A (en) * 1952-08-04 1956-08-21 Bolt Beranek & Newman Acoustic method and system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1916907A (en) * 1933-02-15 1933-07-04 Don A Sargent Ventilating and air-conditioning apparatus
US2415621A (en) * 1944-10-20 1947-02-11 Solar Aircraft Co Fan
US2759555A (en) * 1952-07-21 1956-08-21 Bolt Beranek & Newman Acoustic method and system
US2759556A (en) * 1952-08-04 1956-08-21 Bolt Beranek & Newman Acoustic method and system

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50103034U (en) * 1974-01-28 1975-08-25
US3857453A (en) * 1974-02-21 1974-12-31 Caterpillar Tractor Co Noise suppression means for tractors
US3970161A (en) * 1974-07-31 1976-07-20 International Harvester Company Motor vehicle
FR2309717A1 (en) * 1975-04-28 1976-11-26 Komatsu Mfg Co Ltd ENGINE RADIATOR INCLUDING A NOISE REDUCTION DEVICE
US4116269A (en) * 1975-04-28 1978-09-26 Kabushiki Kaisha Komatsu Seisakusho Engine radiator with means for noise reduction
JPS51139836U (en) * 1975-05-02 1976-11-11
JPS5528827Y2 (en) * 1975-05-02 1980-07-10
US4169501A (en) * 1976-12-02 1979-10-02 Kabushiki Kaisha Komatsu Seisakusho Airflow regulating apparatus for radiator
US4345341A (en) * 1980-04-25 1982-08-24 Kimura Bed Mfg. Company Limited Vacuum suction type urinating aid
DK157348B (en) * 1980-04-25 1989-12-27 Kimura Bed Mfg URINUATION APPARATUS FOR WATERING
US4662818A (en) * 1983-07-23 1987-05-05 International Standard Electric Corporation Tangential blower
US4596921A (en) * 1984-05-22 1986-06-24 Hersh Alan S Low noise hand-held hairdryer
US4750860A (en) * 1986-06-30 1988-06-14 Tandem Computers Incorporated Fan
US5024267A (en) * 1989-06-28 1991-06-18 Aisin Kako Kabushiki Kaisha Cooling apparatus for heat exchanger
US5000079A (en) * 1990-05-17 1991-03-19 Mardis Michael C Noise-attenuating ventilation pedestal for an electronic enclosure
BE1011631A3 (en) * 1997-12-19 1999-11-09 Atlas Copco Airpower Nv Fan with silencer and the silencer used for this
US6123051A (en) * 1998-08-12 2000-09-26 Chrysler Corporation Shroud for an engine cooling fan
US6471472B1 (en) 2000-05-03 2002-10-29 Siemens Canada Limited Turbomachine shroud fibrous tip seal
US20090211253A1 (en) * 2005-06-16 2009-08-27 Utc Power Corporation Organic Rankine Cycle Mechanically and Thermally Coupled to an Engine Driving a Common Load
US20070034444A1 (en) * 2005-08-15 2007-02-15 Mk Seiko Co., Ltd. Reflecting plate type silencer pipe
US7503426B2 (en) * 2005-08-15 2009-03-17 Mk Seiko Co., Ltd. Reflecting plate type silencer pipe
US20070187163A1 (en) * 2006-02-10 2007-08-16 Deere And Company Noise reducing side shields
US20100018798A1 (en) * 2008-07-22 2010-01-28 Volvo Construction Equipment Holding Sweden Ab Noise silencer for construction equipment
US8672089B2 (en) * 2008-11-27 2014-03-18 Caterpillar (Ni) Limited Baffle arrangement for a genset enclosure
US20120097479A1 (en) * 2008-11-27 2012-04-26 Kelly Gary S Baffle Arrangement for a Genset Enclosure
US20110189019A1 (en) * 2010-02-01 2011-08-04 Jason Scot Richardson Shroud for rotating machine component
US8888452B2 (en) 2010-02-01 2014-11-18 Parker Hannifin Corporation Shroud for rotating machine component
US20140366815A1 (en) * 2011-10-31 2014-12-18 Chenfei Lu Air heat exchanger
US9200848B2 (en) * 2011-10-31 2015-12-01 Chenfei Lu Air heat exchanger
US20140102675A1 (en) * 2012-10-15 2014-04-17 Caterpillar Inc. Fan shroud
USD764652S1 (en) * 2014-01-06 2016-08-23 Ebm-Papst Mulfingen Gmbh & Co. Kg Diffuser grid
US20180166057A1 (en) * 2016-12-14 2018-06-14 Samsung Electronics Co., Ltd. Electronic device with soundproof structure
US10741157B2 (en) * 2016-12-14 2020-08-11 Samsung Electronics Co., Ltd. Electronic device with soundproof structure
US11289064B2 (en) * 2018-12-31 2022-03-29 Dell Products L.P. Systems and methods for vibrational and acoustic damping with baffle structure
US20220366887A1 (en) * 2019-09-03 2022-11-17 3M Innovative Properties Company Assembly including acoustic baffles

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