US20050092544A1 - Fan unit air flow control - Google Patents

Fan unit air flow control Download PDF

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Publication number
US20050092544A1
US20050092544A1 US10/877,632 US87763204A US2005092544A1 US 20050092544 A1 US20050092544 A1 US 20050092544A1 US 87763204 A US87763204 A US 87763204A US 2005092544 A1 US2005092544 A1 US 2005092544A1
Authority
US
United States
Prior art keywords
fan unit
air flow
outlet opening
fan
plates
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.)
Abandoned
Application number
US10/877,632
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English (en)
Inventor
Zong Tang Lee
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.)
Kyodo-Allied Industries Ltd
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to KYODO ALLIED INDUSTRIES LTD. reassignment KYODO ALLIED INDUSTRIES LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEE, ZONG TANG
Publication of US20050092544A1 publication Critical patent/US20050092544A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4253—Fan casings with axial entry and discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/165—Axial entry and discharge
    • 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

Definitions

  • the present invention relates to a fan unit air flow control and refers particularly, though not exclusively, to a fan unit air flow control for reducing noise from a fan unit in a clean room facility.
  • a fan unit comprising:
  • a fan blower disposed on a blower mounting, the fan blower being for drawing air through the inlet opening and for discharging air through the outlet opening,
  • At least one pair of guides extending inwardly from a lower end of the at least one side towards the outlet opening, said at least one pair of guides and the blower mounting forming an air flow channel therebetween.
  • the air flow channel creating a constriction on air flow to raise air pressure within the air flow channel to thereby create substantially mono-directional air flow in the air flow channel and through the outlet opening, with reduced turbulence such that noise from said fan unit is minimised.
  • the guide baffles may define the outlet opening.
  • the guide baffles may be disposed at an angle of between 90° and 60° with the at least one side, preferably 90°.
  • the guide baffles may be perforated. The perforation may be over all or a part only of the guide baffles, and the guide baffles may be covered by a cloth. Additionally or alternatively, the guide baffles may be curved or flat.
  • the outlet opening may be of a shape selected from: circular, triangular, square, rectangular, pentagonal, or octagonal.
  • At least one pair of plates disposed within the fan unit extending between and being connected to each of the top and the at least one side, each of the at least one pair of plates defining an enclosed space behind it.
  • At least one of the plates may perforated. The perforations may be over all or part of the at least one of the plates.
  • the plates may be curved or flat and the plates may be covered by a cloth.
  • the enclosed space may be filled with a noise insulating material.
  • a noise insulating material may be used to line an internal surface of one or more of the at least one side, the top, the guide baffles, and the plates.
  • the blower mounting may have a noise insulating material attached to a surface thereof.
  • the surface may be a lower surface.
  • the blower mounting may be in the form of an inverted tray with depending side walls, the noise insulating material being located in the tray.
  • the top may have a central opening.
  • the central opening may have an inlet cover, the inlet opening being in the inlet cover.
  • a filter may be located below the outlet opening.
  • the at least one side may be four mutually perpendicular sides, the sides also being perpendicular to the top.
  • FIG. 1 is a exploded, front perspective view of a preferred form of the present invention integrated as part of a fan unit;
  • FIG. 2 is a cross sectional elevational view of the form of FIG. 1 when assembled;
  • FIG. 3 is a full cross-sectional view along the lines and in the direction of arrows A-A on FIG. 2 ;
  • FIG. 4 is a view corresponding to FIG. 3 of an alternative embodiment
  • FIG. 5 shows the locations where the velocity of airflow was measured
  • FIG. 6 is a chart comparing the average velocity of airflow and the noise level with and without the preferred form of the present invention.
  • FIG. 7 shows a cross sectional elevational view of an alternative embodiment of the lower portion of FIG. 1 when assembled.
  • FIG. 1 is an exploded, front, perspective view of a preferred embodiment the present invention integrated as part of a fan unit.
  • the fan unit comprises four mutually perpendicular side walls 22 , and an annular top 17 having a central opening 10 .
  • the fan unit is shown as being square in shape, it may be of any suitable shape such as, for example, cylindrical, triangular, rectangular, pentagonal, octagonal, and so forth.
  • the central opening 10 is shown as being square. It also may be of any suitable shape such as, for example, round, triangular, rectangular, pentagonal, octagonal, and so forth. Preferably, the shape of central opening 10 is similar to that of the fan unit.
  • Air inlet cover 11 Located over and enclosing central opening 10 is air inlet cover 11 .
  • Cover 11 covers central opening 10 and is dimensionally larger than opening 10 such that it contacts top 17 around the periphery of opening 10 .
  • Cover 11 is securely, releasably and substantially sealingly attached to top 17 .
  • Cover 11 is also annular and has a central air inlet opening 18 .
  • Inlet opening 18 is shown as being round. It may be any suitable shape as is required or desired such as, for example, triangular, square, rectangular, pentagonal, octagonal, and so forth. There may be more than one inlet opening 18 .
  • a fan blower 12 is disposed on a fan blower mounting 14 that may have depending side walls 15 .
  • mounting 14 may be flat.
  • Mounting 14 may also be invertable. Attached to the blower mounting 14 and extending upwardly therefrom are four rods 13 also releasably connected to the air inlet cover 11 .
  • a motor for providing rotational movement for the fan blower 12 .
  • the mounting 14 may be dimensionally larger than the outlet opening 19 in the horizontal plane so that it extends beyond the periphery of outlet opening 19 .
  • the mounting 14 may also be dimensionally smaller than the outlet opening 19 in the horizontal plane.
  • the dimensions of the mounting 14 may depend on the dimensions of the fan blower 12 .
  • the size of the fan blower 12 may depend on the performance requirements of a user.
  • the mounting 14 need not be a custom-fitted blower mounting.
  • blower 12 may be located inside the fan unit and may be on its mounting 14 .
  • the mounting 14 may be suspended from top 17 by the connection of the rods 13 to the inlet cover 11 , and the inlet cover 11 may be supported by top 17 .
  • This may enable blower 12 to be easily removed through central opening 10 for servicing, maintenance, or replacement.
  • the central opening should be sized accordingly.
  • the fan unit draws air externally through air inlet 18 as is shown by arrows 1 on FIG. 2 .
  • the air is discharged through the outlet opening 19 as shown by arrows 2 on FIG. 2 .
  • Located below the outlet opening 19 may be a filter 32 for removing large particles or contaminants.
  • the outlet opening 19 is shown as being square. It may be any suitable or desired shape such as, for example, circular, triangular, rectangular, pentagonal, octagonal, and so forth. There may be more than one outlet opening 19 .
  • Filter 32 may be spaced from outlet opening 19 , or may be immediately adjacent outlet opening 19 .
  • guide baffles 28 are placed in strategic locations within the fan unit to minimise noise from it, and may also be placed along the path of the airflow.
  • Baffles 28 extend inwardly from a lower end of side 22 .
  • At least one pair of the guide baffles 28 is disposed on opposite sides of the outlet opening 19 and extend inwardly from side walls 22 to the outlet opening 19 .
  • the pair of baffles 28 are substantially identical, opposed, parallel, and co-planar.
  • the guide baffles 28 are at an angle to the side walls of 90° to 60°, preferably 90°.
  • there are preferably two such pairs of guide baffles 28 all being mutually perpendicular to form, in effect, a floor of guide baffles 28 around outlet opening 19 .
  • Guide baffles 28 may also define the outlet opening 19 .
  • Guide baffles 28 may be flat, as shown, or may be curved. If curved, they may be curved downwardly toward outlet opening 19 . This is illustrated in FIG. 7 .
  • FIG. 3 is a full cross-sectional view along the lines A-A of FIG. 2 highlighting the guides baffles 28 .
  • the guide baffles 28 are placed to receive the discharged air from the fan blower 12 (shown in the dotted circle) and to guide the flow of air 3 within the fan unit with minimal of turbulence towards, and through, the outlet opening 19 .
  • At least one pair of plates 26 for further absorbing the sound generated from the moving air 3 generated by the fan blower 12 may also be provided.
  • each plate 26 there are two pairs of plates 26 , mutually perpendicular to each other.
  • the plates 26 extend between top 17 and sides 22 and are preferably at an angle of between 30° and 60°, preferably 45°, to the sides 22 , and thus at an angle of between 60° and 30°, preferably 45°, to top 17 .
  • Each plate 26 may be a sheet of metal, and may have a matrix of holes or perforations over all or part of its surface.
  • Sound insulation materials 6 and/or such as sponge, fibreglass, rockwool, linen cloth and so forth may be fixed on the plates 26 and/or the guide baffles 28 and/or top 17 on an internal surface facing the air streams 1 , 2 and 3 .
  • the plates 26 are preferably disposed at the angles given above to absorb the noise generated from the air flow 3 from the fan blower 12 and/or to assist in controlling the air flow 3 .
  • each plate 26 may contain perforations.
  • the size of the perforations may determine whether or not the air will slow when passing through the perforations.
  • a space 31 is created between each plate 26 , the top 17 and the side 22 . Due to space 31 behind plates 26 , air pressure in space 31 will increase to be the same as that on the perforations at the part of the airflow 3 with the highest velocity. This will force air out through perforations in plates 26 where the airflow 3 is not as fast.
  • the space 31 may have insulation or other material in it to reduce noise caused by air turbulence. Plate 26 may also be wholly or in part perforated.
  • Sound insulation materials may be used to partially or completely fill the space 31 .
  • the sound insulation material may be one or more of: sponge, fibreglass, rockwool, linen cloth and so forth. If desired, a layer of protection may further be added on top of the insulation facing the air stream 3 to further strengthen the insulation material from relocation or disintegration over a period of time.
  • insulation material 16 may also be fixed on a lower surface of the fan blower mounting 14 to further absorb noise generated by both the air flow 3 and the blower 12 .
  • the insulating material 16 may be on other surfaces of mounting 14 .
  • insulating material 16 may be located within tray 14 .
  • mounting 14 has sides that extend vertically for a height equal to or greater than the thickness of insulating material 16 .
  • One or more of the guide baffles 28 may be porous, if desired.
  • the porousity may be achieved by using perforations over the area of the baffles 28 .
  • the perforations may be over all or part of their surfaces.
  • a cloth covering may be placed over all or some of the insulation material, or behind the perforations, to reduce the likelyhood of dislodgement and contamination of the air.
  • the perforations may assist in securing the insulation material to the baffles 28 and plates 26 .
  • Guide baffles 28 direct the flow of air 3 towards outlet opening 19 , and may be flat or curved.
  • the insulating material 36 may be of a greater thickness than insulating materials 6 and/or 16 . It may be sponge, fibreglass, rockwool, linen cloth and may have a cloth covering. Some or all of insulating materials 6 , 16 , 36 may have reinforcement frames, if required or desired.
  • the guide baffles 28 and blower mounting 14 between them create one or more air-flow channels 20 through which air is moved towards the outlet opening 19 and thus filter 32 .
  • the air flow channels extend around the periphery of outlet opening 19 .
  • Outlet air flow 2 may pass through filter 32 .
  • the air-flow channels 20 create a constriction on air flow, and thus form a high pressure air zone. Air flows from high pressure to low pressure. This therefore forces all air to flow though channels 20 so that the air flow will be strongly mono-directional through outlet opening 19 as air will generally not flow from low pressure to high pressure. This significantly reduces turbulence in channels 20 and outlet opening 19 . As such, noise is significantly reduced, and air-flow efficiency is increased.
  • FIG. 6 is a chart comparing the average velocity of airflow and the noise level of a fan unit with and without the present invention.
  • the average velocity of airflow is measured at 24 different points in the fan fitter unit and illustrated in FIG. 5 respectively.
  • (a) is a conventional fan unit, whereas (b) and (c) are in accordance with the present invention.
  • the average air velocity of both (b) and (c) is higher and quieter than (a). As such the pressure loss of the fan units (b) and (C) is less than (a). Therefore, energy savings over time can be achieved.
  • an embodiment of the present invention may allow the fan unit to operate with less noise than a prior art fan unit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US10/877,632 2003-11-05 2004-06-25 Fan unit air flow control Abandoned US20050092544A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG200306562-0A SG142128A1 (en) 2003-11-05 2003-11-05 Fan unit air flow control
SG200306562-0 2003-11-05

Publications (1)

Publication Number Publication Date
US20050092544A1 true US20050092544A1 (en) 2005-05-05

Family

ID=34432639

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/877,632 Abandoned US20050092544A1 (en) 2003-11-05 2004-06-25 Fan unit air flow control

Country Status (5)

Country Link
US (1) US20050092544A1 (de)
EP (1) EP1530109B1 (de)
CN (1) CN1614243A (de)
DE (1) DE502004006474D1 (de)
SG (1) SG142128A1 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100112929A1 (en) * 2008-11-03 2010-05-06 Airex Inc. Recessed fan inlet cover
US20120291990A1 (en) * 2011-05-16 2012-11-22 Huawei Technologies Co., Ltd. Heat dissipation apparatus and outdoor communication device
US8770341B2 (en) 2011-09-13 2014-07-08 Black & Decker Inc. Compressor intake muffler and filter
US8899378B2 (en) 2011-09-13 2014-12-02 Black & Decker Inc. Compressor intake muffler and filter
JP2016094943A (ja) * 2016-02-24 2016-05-26 ミネベア株式会社 遠心式ファン
CN108906795A (zh) * 2018-08-21 2018-11-30 镇江裕太防爆电加热器有限公司 一种用于三角形镁管烧结设备的吹扫结构
CN110100102A (zh) * 2016-12-23 2019-08-06 施乐百有限公司 风扇模块和一个或多个这种风扇模块在流动管道中的布置
CN111984090A (zh) * 2020-09-28 2020-11-24 苏州浪潮智能科技有限公司 一种风扇挡板、风扇模组及机箱
CN113202262A (zh) * 2021-05-25 2021-08-03 浙江宁溢电力工程设计咨询有限公司 一种地下变电所的通风装置
US11111913B2 (en) 2015-10-07 2021-09-07 Black & Decker Inc. Oil lubricated compressor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112957833A (zh) * 2021-03-10 2021-06-15 惠亚科技（苏州）有限公司 一种过滤设备

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US3085647A (en) * 1960-11-07 1963-04-16 Jenn Air Products Company Inc Acoustic curb
US4560395A (en) * 1984-04-17 1985-12-24 Environmental Air Control, Inc. Compact blower and filter assemblies for use in clean air environments
US4990290A (en) * 1989-05-08 1991-02-05 Gill James G Diffusion fogger
US5801342A (en) * 1997-01-27 1998-09-01 Lindab Ab Double-walled structure and method and arrangement for producing the same
US6030186A (en) * 1997-09-03 2000-02-29 Kyodo-Allied Industries Pte, Ltd. Method and apparatus for minimizing noise from fan filter unit
US6217281B1 (en) * 1999-06-30 2001-04-17 Industrial Technology Research Institute Low-noise fan-filter unit
US6444004B1 (en) * 2001-02-26 2002-09-03 Kyodo-Allied Industries Ltd. Fan unit
US6592451B2 (en) * 2001-02-26 2003-07-15 Kyodo-Allied Industries Ltd Fan unit

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DE4412583C1 (de) * 1994-04-13 1995-09-14 Daldrop & Dr Ing Huber Gmbh & Ventilator-Filtereinheit für Reinraumdecken
US5470363A (en) * 1995-01-13 1995-11-28 Envirco Corporation Air blower and filter assemblies

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Publication number Priority date Publication date Assignee Title
US3085647A (en) * 1960-11-07 1963-04-16 Jenn Air Products Company Inc Acoustic curb
US4560395A (en) * 1984-04-17 1985-12-24 Environmental Air Control, Inc. Compact blower and filter assemblies for use in clean air environments
US4990290A (en) * 1989-05-08 1991-02-05 Gill James G Diffusion fogger
US5801342A (en) * 1997-01-27 1998-09-01 Lindab Ab Double-walled structure and method and arrangement for producing the same
US6030186A (en) * 1997-09-03 2000-02-29 Kyodo-Allied Industries Pte, Ltd. Method and apparatus for minimizing noise from fan filter unit
US6217281B1 (en) * 1999-06-30 2001-04-17 Industrial Technology Research Institute Low-noise fan-filter unit
US6444004B1 (en) * 2001-02-26 2002-09-03 Kyodo-Allied Industries Ltd. Fan unit
US6592451B2 (en) * 2001-02-26 2003-07-15 Kyodo-Allied Industries Ltd Fan unit

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100112929A1 (en) * 2008-11-03 2010-05-06 Airex Inc. Recessed fan inlet cover
US20120291990A1 (en) * 2011-05-16 2012-11-22 Huawei Technologies Co., Ltd. Heat dissipation apparatus and outdoor communication device
US9181938B2 (en) 2011-09-13 2015-11-10 Black & Decker Inc. Tank dampening device
US9309876B2 (en) 2011-09-13 2016-04-12 Black & Decker Inc. Compressor intake muffler and filter
US8899378B2 (en) 2011-09-13 2014-12-02 Black & Decker Inc. Compressor intake muffler and filter
US8967324B2 (en) 2011-09-13 2015-03-03 Black & Decker Inc. Compressor housing having sound control chambers
US9097246B2 (en) 2011-09-13 2015-08-04 Black & Decker Inc. Tank dampening device
US9127662B2 (en) 2011-09-13 2015-09-08 Black & Decker Inc. Tank dampening device
US10871153B2 (en) 2011-09-13 2020-12-22 Black & Decker Inc. Method of reducing air compressor noise
US8851229B2 (en) 2011-09-13 2014-10-07 Black & Decker Inc. Tank dampening device
US8770341B2 (en) 2011-09-13 2014-07-08 Black & Decker Inc. Compressor intake muffler and filter
US9458845B2 (en) 2011-09-13 2016-10-04 Black & Decker Inc. Air ducting shroud for cooling an air compressor pump and motor
US9890774B2 (en) 2011-09-13 2018-02-13 Black & Decker Inc. Compressor intake muffler and filter
US10012223B2 (en) 2011-09-13 2018-07-03 Black & Decker Inc. Compressor housing having sound control chambers
US10036375B2 (en) 2011-09-13 2018-07-31 Black & Decker Inc. Compressor housing having sound control chambers
US11788522B2 (en) 2011-09-13 2023-10-17 Black & Decker Inc. Compressor intake muffler and filter
US10982664B2 (en) 2011-09-13 2021-04-20 Black & Decker Inc. Compressor intake muffler and filter
US11111913B2 (en) 2015-10-07 2021-09-07 Black & Decker Inc. Oil lubricated compressor
JP2016094943A (ja) * 2016-02-24 2016-05-26 ミネベア株式会社 遠心式ファン
CN110100102A (zh) * 2016-12-23 2019-08-06 施乐百有限公司 风扇模块和一个或多个这种风扇模块在流动管道中的布置
CN108906795A (zh) * 2018-08-21 2018-11-30 镇江裕太防爆电加热器有限公司 一种用于三角形镁管烧结设备的吹扫结构
CN111984090A (zh) * 2020-09-28 2020-11-24 苏州浪潮智能科技有限公司 一种风扇挡板、风扇模组及机箱
CN113202262A (zh) * 2021-05-25 2021-08-03 浙江宁溢电力工程设计咨询有限公司 一种地下变电所的通风装置

Also Published As

Publication number Publication date
DE502004006474D1 (de) 2008-04-24
EP1530109A2 (de) 2005-05-11
EP1530109A3 (de) 2006-01-18
SG142128A1 (en) 2008-05-28
EP1530109B1 (de) 2008-03-12
CN1614243A (zh) 2005-05-11

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Date Code Title Description
AS Assignment

Owner name: KYODO ALLIED INDUSTRIES LTD., SINGAPORE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEE, ZONG TANG;REEL/FRAME:015526/0008

Effective date: 20040531

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION