US3286914A - Fans - Google Patents

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Publication number
US3286914A
US3286914A US400843A US40084364A US3286914A US 3286914 A US3286914 A US 3286914A US 400843 A US400843 A US 400843A US 40084364 A US40084364 A US 40084364A US 3286914 A US3286914 A US 3286914A
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United States
Prior art keywords
scroll
fan
rotor
casing
fans
Prior art date
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
US400843A
Inventor
Baverstock Peter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brightside Heating and Engineering Co Ltd
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Brightside Heating and Engineering Co Ltd
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Publication date
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Publication of US3286914A publication Critical patent/US3286914A/en
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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
    • F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • This invention relates to fans of the kind known as centrifugal fans in which air or other gas is drawn into the center of the fan and expelled radially or tangentially, the fans including a scroll fixed in the fan casing and disposed about a rotor on which the fan blades are mounted, this scroll being located eccentrically or possibly concentrically of the rotor axis and defining a guide for the air or gas and terminating at the ouflet or outlets of the fan.
  • the object of the present invention is to provide an improved construction adapted for the reduction of noise when the fan is working.
  • a fan of the kind referred to is provided with a scroll which is perforated over substantially its entire length and is backed by sound absorbent material over the whole perforated area, the scroll being of sinuous, corrugated or other non-planar form in the direction parallel to the rotor axis.
  • the scroll may be made of light gauge expanded sheet metal and may be formed by profiling rollers into a configuration designed to minimize turbulent air flow in directions other than that induced by the fan and hence to avoid vibration and resonance in the fan casing,
  • the sound absorbent material may be mineral wool, cork, glass fibres or any combination of these materials or of any other sound deadening material.
  • the fan shown in the drawing comprises a rotor having a plurality of peripheral blades 11 and located in a stationary and fixed casing generally indicated at 12.
  • Casing 12 includes a scroll 13 which extends about the 3,286,914 Patented Nov. 22, 1966 ice rotor from one edge of the tangential fan outlet to the other.
  • the scroll is eccentric to the rotor axis, and is of zig-zag or saw-tooth lateral section: the angle 14 of the individual parts of the zig-zag is at least 45 to the axis of the rotor and may be greater.
  • the individual zig-zags are preferably at least /2" in height, i.e. the distance radially of the rotor axis between a plane containing the inner set of apices of the scroll and the outer set of apices of the scroll is greater than /2".
  • the scroll is made of perforated metal and is backed by sound-absorbing mineral wool 15.
  • a centrifugal fan the combination of a casing including a pair of side walls at least one of which isprovided with an air inlet opening and also including a marginal wall provided with an air outlet, a rotor mounted in said casing, a scroll in the casing comprising an elongated and longitudinally curved plate surrounding said rotor in spaced relation from said marginal wall with the ends of the plate terminating at said air outlet, said scroll plate being foraminous over its entire area and having a saw-tooth cross-section extending transversely across the full width of the casing between said side walls, said saw-tooth cross-section of the scroll plate defining a set of spaced parallel V-shaped ridges and intermediate V-shaped valleys extending longitudinally of the plate in a circumferential direction around said rotor and in planes parallel to the plane of rotation of the rotor, and packing of sound-absorbing material provided in the space between said scroll plate and the marginal wall of the casing, said packing also filling the V-shaped valleys existing between the a

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Nov. 22, 1966 P. BAVERSTOCK FANS Filed Oct. 1, 1964 k r T0 fws y v a MB P- m P q Mark Hqenf United States Patent 3,286,914 FANS Peter Baverstock, Lee-on-Solent, England, assignor to Brightside Heating and Engineering Company Limited,
Sheflield, England Filed Oct. 1, 1964, Ser. No. 400,843
Claims priority, application Great Britain, Oct. 29, 1963,
42,510/63 1 Claim. (Cl. 230-432 This invention relates to fans of the kind known as centrifugal fans in which air or other gas is drawn into the center of the fan and expelled radially or tangentially, the fans including a scroll fixed in the fan casing and disposed about a rotor on which the fan blades are mounted, this scroll being located eccentrically or possibly concentrically of the rotor axis and defining a guide for the air or gas and terminating at the ouflet or outlets of the fan.
The object of the present invention is to provide an improved construction adapted for the reduction of noise when the fan is working.
According to the present invention a fan of the kind referred to is provided with a scroll which is perforated over substantially its entire length and is backed by sound absorbent material over the whole perforated area, the scroll being of sinuous, corrugated or other non-planar form in the direction parallel to the rotor axis.
The scroll may be made of light gauge expanded sheet metal and may be formed by profiling rollers into a configuration designed to minimize turbulent air flow in directions other than that induced by the fan and hence to avoid vibration and resonance in the fan casing,
The sound absorbent material may be mineral wool, cork, glass fibres or any combination of these materials or of any other sound deadening material.
The invention is more particularly described with reference to the accompanying drawing, wherein the sole figure is a part sectional perspective and somewhat diagrammatic view of a centrifugal fan in accordance with the invention.
The fan shown in the drawing comprises a rotor having a plurality of peripheral blades 11 and located in a stationary and fixed casing generally indicated at 12. Casing 12 includes a scroll 13 which extends about the 3,286,914 Patented Nov. 22, 1966 ice rotor from one edge of the tangential fan outlet to the other. The scroll is eccentric to the rotor axis, and is of zig-zag or saw-tooth lateral section: the angle 14 of the individual parts of the zig-zag is at least 45 to the axis of the rotor and may be greater. The individual zig-zags are preferably at least /2" in height, i.e. the distance radially of the rotor axis between a plane containing the inner set of apices of the scroll and the outer set of apices of the scroll is greater than /2".
The scroll is made of perforated metal and is backed by sound-absorbing mineral wool 15.
I claim:
In a centrifugal fan, the combination of a casing including a pair of side walls at least one of which isprovided with an air inlet opening and also including a marginal wall provided with an air outlet, a rotor mounted in said casing, a scroll in the casing comprising an elongated and longitudinally curved plate surrounding said rotor in spaced relation from said marginal wall with the ends of the plate terminating at said air outlet, said scroll plate being foraminous over its entire area and having a saw-tooth cross-section extending transversely across the full width of the casing between said side walls, said saw-tooth cross-section of the scroll plate defining a set of spaced parallel V-shaped ridges and intermediate V-shaped valleys extending longitudinally of the plate in a circumferential direction around said rotor and in planes parallel to the plane of rotation of the rotor, and packing of sound-absorbing material provided in the space between said scroll plate and the marginal wall of the casing, said packing also filling the V-shaped valleys existing between the ridges of the plate facing said marginal wall.
References Cited by the Examiner UNITED STATES PATENTS 1,233,115 7/1917 Osborne 103-103 2,855,142 10/ 1958 White 230-133 3,174,682 3/1965 Wilfert et a1 103-114 X FOREIGN PATENTS 926,088 5/1963 Great Britain.
ROBERT M. WALKER, Primary Examiner.
US400843A 1963-10-29 1964-10-01 Fans Expired - Lifetime US3286914A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB42510/63A GB1007068A (en) 1963-10-29 1963-10-29 Improvements relating to centrifugal fans

Publications (1)

Publication Number Publication Date
US3286914A true US3286914A (en) 1966-11-22

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US400843A Expired - Lifetime US3286914A (en) 1963-10-29 1964-10-01 Fans

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GB (1) GB1007068A (en)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459365A (en) * 1967-12-01 1969-08-05 Torrington Mfg Co Transverse flow blower unit having cavity with restricted opening adjacent cut-off section
US3526292A (en) * 1969-06-11 1970-09-01 Bofors Ab Device for damping acoustic vibrations generated by the rotation of a prismatic body within a drum
WO1979000043A1 (en) * 1977-07-13 1979-02-08 Carrier Corp Pressure variation absorber
US4411592A (en) * 1977-07-13 1983-10-25 Carrier Corporation Pressure variation absorber
US4482294A (en) * 1979-05-11 1984-11-13 C. K. Kelley & Sons, Inc. Power unit for single line pneumatic tube system
US4504188A (en) * 1979-02-23 1985-03-12 Carrier Corporation Pressure variation absorber
US4560320A (en) * 1982-01-07 1985-12-24 Baus Heinz Georg Ventilating unit
US5484259A (en) * 1994-06-13 1996-01-16 Emerson Electric Co. Low noise centrifugal blower
US5868551A (en) * 1997-05-02 1999-02-09 American Standard Inc. Tangential fan cutoff
US6375416B1 (en) 1993-07-15 2002-04-23 Kevin J. Farrell Technique for reducing acoustic radiation in turbomachinery
WO2006026295A2 (en) * 2004-08-26 2006-03-09 Twin City Fan Companies, Ltd. Plenum/plug fan assembly
US20060054712A1 (en) * 2004-09-13 2006-03-16 Guolian Wu Vertical dehumidifier
US20060099071A1 (en) * 2004-11-05 2006-05-11 Ping-Sheng Kao Centrifugal fan
CN101451542A (en) * 2007-12-06 2009-06-10 三星电子株式会社 Blower and air conditioner having the same
US20090232648A1 (en) * 2008-03-14 2009-09-17 Wayne State University Reduction of flow-induced noise in a centrifugal blower
US20130260664A1 (en) * 2012-03-30 2013-10-03 Rockwell Automation Technologies, Inc. Eccentric fan housing
US8678131B2 (en) * 2012-03-30 2014-03-25 Textron Innovations Inc. Acoustic baffle for centrifugal blowers
CN104196740A (en) * 2014-08-28 2014-12-10 山西潞安环保能源开发股份有限公司 Mine counter-rotating type local ventilator
US20150275915A1 (en) * 2014-04-01 2015-10-01 Mahle International Gmbh Housing of a centrifugal blower
US20160209893A1 (en) * 2015-01-21 2016-07-21 Lenovo (Beijing) Co., Ltd. Centrifugal Fan and an Electronic Device Having the Same
US10415601B2 (en) * 2017-07-07 2019-09-17 Denso International America, Inc. Blower noise suppressor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1233115A (en) * 1916-04-08 1917-07-10 Clarence N Mack Centrifugal conveyer-fan.
US2855142A (en) * 1955-12-22 1958-10-07 Harman J White Blower structure for a grain separator
GB926088A (en) * 1960-11-08 1963-05-15 Brightside Heating & Engineeri Improvements relating to centrifugal fans
US3174682A (en) * 1961-07-01 1965-03-23 Daimler Benz Ag Heating or cooling fan

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1233115A (en) * 1916-04-08 1917-07-10 Clarence N Mack Centrifugal conveyer-fan.
US2855142A (en) * 1955-12-22 1958-10-07 Harman J White Blower structure for a grain separator
GB926088A (en) * 1960-11-08 1963-05-15 Brightside Heating & Engineeri Improvements relating to centrifugal fans
US3174682A (en) * 1961-07-01 1965-03-23 Daimler Benz Ag Heating or cooling fan

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459365A (en) * 1967-12-01 1969-08-05 Torrington Mfg Co Transverse flow blower unit having cavity with restricted opening adjacent cut-off section
US3526292A (en) * 1969-06-11 1970-09-01 Bofors Ab Device for damping acoustic vibrations generated by the rotation of a prismatic body within a drum
WO1979000043A1 (en) * 1977-07-13 1979-02-08 Carrier Corp Pressure variation absorber
US4411592A (en) * 1977-07-13 1983-10-25 Carrier Corporation Pressure variation absorber
US4504188A (en) * 1979-02-23 1985-03-12 Carrier Corporation Pressure variation absorber
US4482294A (en) * 1979-05-11 1984-11-13 C. K. Kelley & Sons, Inc. Power unit for single line pneumatic tube system
US4560320A (en) * 1982-01-07 1985-12-24 Baus Heinz Georg Ventilating unit
US6375416B1 (en) 1993-07-15 2002-04-23 Kevin J. Farrell Technique for reducing acoustic radiation in turbomachinery
US5484259A (en) * 1994-06-13 1996-01-16 Emerson Electric Co. Low noise centrifugal blower
US5868551A (en) * 1997-05-02 1999-02-09 American Standard Inc. Tangential fan cutoff
WO2006026295A2 (en) * 2004-08-26 2006-03-09 Twin City Fan Companies, Ltd. Plenum/plug fan assembly
WO2006026295A3 (en) * 2004-08-26 2006-07-13 Twin City Fan Companies Ltd Plenum/plug fan assembly
US20060054712A1 (en) * 2004-09-13 2006-03-16 Guolian Wu Vertical dehumidifier
US20060099071A1 (en) * 2004-11-05 2006-05-11 Ping-Sheng Kao Centrifugal fan
CN101451542A (en) * 2007-12-06 2009-06-10 三星电子株式会社 Blower and air conditioner having the same
US8721274B2 (en) * 2007-12-06 2014-05-13 Samsung Electronics Co., Ltd. Blower and air conditioner having the same
US20090145583A1 (en) * 2007-12-06 2009-06-11 Samsung Electronics Co., Ltd. Blower and air conditioner having the same
US20090232648A1 (en) * 2008-03-14 2009-09-17 Wayne State University Reduction of flow-induced noise in a centrifugal blower
US8231331B2 (en) * 2008-03-14 2012-07-31 Wayne State University Reduction of flow-induced noise in a centrifugal blower
US20130260664A1 (en) * 2012-03-30 2013-10-03 Rockwell Automation Technologies, Inc. Eccentric fan housing
US8678131B2 (en) * 2012-03-30 2014-03-25 Textron Innovations Inc. Acoustic baffle for centrifugal blowers
US9279358B2 (en) 2012-03-30 2016-03-08 Textron Innovations, Inc. Acoustic baffle for centrifugal blowers
US10125787B2 (en) * 2014-04-01 2018-11-13 Mahle International Gmbh Housing of a centrifugal blower
US20150275915A1 (en) * 2014-04-01 2015-10-01 Mahle International Gmbh Housing of a centrifugal blower
CN104196740A (en) * 2014-08-28 2014-12-10 山西潞安环保能源开发股份有限公司 Mine counter-rotating type local ventilator
US9933824B2 (en) * 2015-01-21 2018-04-03 Lenovo (Beijing) Co., Ltd. Centrifugal fan and an electronic device having the same
US20160209893A1 (en) * 2015-01-21 2016-07-21 Lenovo (Beijing) Co., Ltd. Centrifugal Fan and an Electronic Device Having the Same
US10415601B2 (en) * 2017-07-07 2019-09-17 Denso International America, Inc. Blower noise suppressor

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Publication number Publication date
GB1007068A (en) 1965-10-13

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