US20030077174A1 - Multi-blade centrifugal fan - Google Patents

Multi-blade centrifugal fan Download PDF

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Publication number
US20030077174A1
US20030077174A1 US09/996,994 US99699401A US2003077174A1 US 20030077174 A1 US20030077174 A1 US 20030077174A1 US 99699401 A US99699401 A US 99699401A US 2003077174 A1 US2003077174 A1 US 2003077174A1
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US
United States
Prior art keywords
hub
fan
centrifugal fan
blade
blades
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
US09/996,994
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English (en)
Inventor
Jae-won Kim
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Individual
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Individual
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Publication of US20030077174A1 publication Critical patent/US20030077174A1/en
Abandoned legal-status Critical Current

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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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type

Definitions

  • the present invention relates to a multi-blade centrifugal fan, and more particularly to a multi-blade centrifugal fan adapted to miniaturize a system having a fan and a driving motor and to prevent a remarkable decrease of fan performance.
  • Centrifugal fans designed to induce air axially and to discharge the air circumferencially, are generally used for household package air conditions and the like.
  • This type of centrifugal fan includes a centrifugal multi-blade fan 4 radially formed with a plurality of blades 2 and a scroll casing 6 externally disposed at outside of the centrifugal multi-blade fan 4 to spirally form a draft passage, as illustrated in FIGS. 1 and 2.
  • the scroll casing 6 is mounted at axial direction of centrifugal multi-blade fan 4 with an air intake 8 for inducing the air, and the air intake 8 is formed with an air outlet 10 90 degrees relative to the air intake 8 .
  • the centrifugal multi-blade fan 4 is equipped with an end plate 12 installed at one side end of the plurality of blades.
  • the end plate 12 is centrally mounted with a hub protruding toward the air intake and the hub is formed at a space (S) thereof with a motor (M).
  • Elements that determine performance of a centrifugal fan include cut-off interval, shape of scroll casing, shape of blade and the like, and many studies to these elements serve to reduce noise and increase efficiency of the centrifugal fans.
  • a fan mounted on a household package air conditioner is formed with a hub protruded toward air intake at a central part of the end plate 12 in concert with miniaturization of household electric appliances, as illustrated in FIG. 2, and the hub is accommodated at the space (S) thereof with the driving motor (M) to thereby enable to reduce the overall size of the blower.
  • the present invention is provided to solve the aforementioned problems and it is an object of the present invention to provide a multi-blade centrifugal fan adapted to miniaturize a blower and to prevent a remarkable decrease of fan performance.
  • a multi-blade centrifugal fan the fan arranged with a plurality of blades in round shape and equipped with an end plate mounted with a tip end of the plurality of blades, wherein the end plate is centrally mounted with protruded hub toward an air intake, and here a protruded height (Hb) of the hub is less than 0.3 times the fan outer diameter (Df).
  • the hub is preferred to have a conical shape having a narrow diameter at air intake.
  • the hub may be shaped of a cylindrical form.
  • the hub is preferred to be formed at lateral surfaces thereof with an plurality of holes for cooling the heat of a motor disposed at a space of the hub.
  • FIG. 1 is a schematic sectional view for illustrating a centrifugal fan according to the prior art
  • FIG. 2 is a sectional view taken along line A-A of FIG. 1;
  • FIG. 3 is a perspective view of a multi-blade centrifugal fan according to a first embodiment of the present invention
  • FIG. 4 is a schematic sectional view of a multi-blade centrifugal fan according to the first embodiment of the present invention
  • FIG. 5 is a schematic sectional view of a multi-blade centrifugal fan according to a second embodiment of the present invention.
  • FIG. 6 is a graph for illustrating changed protrusion heights of hub at the multi-blade centrifugal fan of FIG. 4 for testing of fan performance
  • FIG. 7 is a graph for illustrating changed protrusion heights of hub at the multi-blade centrifugal fan of FIGS. 5 for testing of fan performance.
  • FIGS. 3 ad 4 illustrate the first embodiment of the present invention.
  • a multi-blade centrifugal fan 20 is circularly formed with a plurality of blades 22 , each at a predetermined interval while the plurality of blades 22 are mounted at one lateral end thereof (motor-attached side) with an end plate 24 .
  • the plurality of blades 22 are mounted at the other lateral end thereof (air intake side) with a support ring 26 , rendering an entire look to be of a cylindrical shape.
  • the end plate 24 centrally protrudes toward an air intake to form a hub 28 , where a protruded height (Hb) of the hub 28 is less than 0.3 times the fan outer diameter (Df). Diameter at air intake side of the hub 28 has a conical shape but rounded at corners thereof.
  • the hub 28 may be integrally formed with the end plate 24 or may be formed with separate member.
  • the hub 28 is protrusively formed at an upper central surface thereof with a boss 30 for inserting and securing the axle of a motor (described later) while the boss 30 is mounted at an external surface thereof with a plurality of support ribs 32 .
  • the hub 28 is disposed at a space (S) formed thereunder with a driving motor (M) while a motor axle thereof is securely inserted into the boss 30 .
  • the driving motor (M) is supportively fixed at external surface or lower lateral surface thereof by scroll case (not shown) for encompassing the multi-blade centrifugal fan 20 .
  • the hub 28 is formed at lateral sides thereof with a plurality of holes 34 for cooling the motor mounted at the space (S) of the hub.
  • the support ring 26 is a fixed frame abutted on an external surface of the fan and maintains the plurality of blades 22 each at a predetermined interval for support.
  • FIG. 5 illustrates a multi-blade centrifugal fan according to the second embodiment of the present invention.
  • a end plate 124 according to the present embodiment is cylindrical at a hub 128 thereof.
  • the hub 128 is less than 0.3 times the fan diameter at protrusion height (Hb) thereof and rounded at corners thereof.
  • Other constructions such as blades 122 , supporting ring 126 , boss 130 , support rib 132 , holes (not shown) formed at sides of the hub are the same as those of the first embodiment as shown in FIG. 4 (the first embodiment).
  • FIG. 6 illustrates performance result tests where, in a multi-blade centrifugal fan having a conical shape of hub, protrusion height (Hb) of the hub is changed from 0 times (hub not protruded), 0.25 times, 0.33 times, 0.48 times, to 0.59 times the fan outer diameter, such that FIG. 6 is a graph for showing a flow rate ( ⁇ : non-dimension) relative to static pressure ( ⁇ : non-dimension)
  • Testing device Wind tunnel having a flow rate of 1.5 ⁇ 50 m 3 /min, manufactured and designed in strict accordance to ASHRAE(American Society of Heating, Refrigerating and Air-conditioning Engineers)
  • the multi-blade centrifugal fan having a conical hub used for the test has a fan height (Hf) 0.47 times the fan outer diameter (Df) while a maximum diameter (Db1) of the hub is 0.55 times the fan outer diameter (Df), a minimum diameter (Db2) is 0.51 times the fan outer diameter (Df) and width (Fw) of a blade is 0.09 times the fan outer diameter (Df).
  • FIG. 7 illustrates performance test results where, in a multi-blade centrifugal fan having a cylindrical shape of hub, protrusion height (Hb) of the hub is changed from 0 times (hub-not-protruded state), 0.30 times, 0.41 times, 0.55 times and 0.66 times the fan outer diameter (Df), such that FIG. 7 is a graph for illustrating a flow rate ( ⁇ : no dimension) versus static pressure ( ⁇ : no dimension).
  • the testing device and method are the same as those of the multi-blade centrifugal fan having a conical shape of hub, where the multi-blade centrifugal fan mounted with a cylindrical shape of hub used for the test has a fan height (Hf) 0.47 times the fan outer diameter (Df) while diameter (Db) of the hub is 0.51 times the fan outer diameter (Df) and width (Fw) of a blade is 0.09 times the fan outer diameter (Df).
  • the flowing table is a numerated graph of FIG. 7 where a flow rate decrease rate of protruded hub is given against flow rate (maximum flow rate) of a multi-blade centrifugal fan having a zero hub protrusion height. Protrusion height of hub 0.30Df 0.41Df 0.55Df 0.66Df Flow rate decrease rate 5% 15% 20% 22% (against maximum flow rate)

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US09/996,994 2001-10-17 2001-11-30 Multi-blade centrifugal fan Abandoned US20030077174A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2001-63896 2001-10-17
KR10-2001-0063896A KR100413177B1 (ko) 2001-10-17 2001-10-17 원심 다익 팬

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US20030077174A1 true US20030077174A1 (en) 2003-04-24

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US09/996,994 Abandoned US20030077174A1 (en) 2001-10-17 2001-11-30 Multi-blade centrifugal fan

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JP (1) JP2003120587A (ko)
KR (1) KR100413177B1 (ko)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040035184A1 (en) * 2002-08-22 2004-02-26 Naoto Yamano Sampling tube-type smoke detector
US20040244403A1 (en) * 2003-06-03 2004-12-09 Samsung Electronics Co., Ltd. Turbofan and air conditioner having the turbofan
US20040247441A1 (en) * 2003-06-03 2004-12-09 Samsung Electronics Co., Ltd. Turbofan and mold manufacturing the same
US20040258519A1 (en) * 2003-06-03 2004-12-23 Samsung Electronics Co., Ltd. Turbofan and method of manufacturing the same
US20050095132A1 (en) * 2003-11-04 2005-05-05 Delta Electronics, Inc. Centrifugal fan
US20060045143A1 (en) * 2004-08-24 2006-03-02 Serguei Anikitchev Wavelength-locked fiber-coupled diode-laser bar
US20060083610A1 (en) * 2004-10-19 2006-04-20 Denso Corporation Centrifugal blower
US20060198729A1 (en) * 2003-05-01 2006-09-07 Daikin Industries, Ltd. Multi-vane centrifugal blower
US20070099554A1 (en) * 2005-11-01 2007-05-03 Hesheng Liang Blower
US20070251680A1 (en) * 2004-07-14 2007-11-01 Kanjirou Kinoshita Centrifugal Blower and Air Conditioner with Centrifugal Blower
US20090022588A1 (en) * 2007-07-16 2009-01-22 Topower Computer Industrial Co., Ltd. Electric fan module and airflow conduction structure thereof
US20090113924A1 (en) * 2007-11-05 2009-05-07 Jun Ho Bae Apparatus for storing food and method for manufacturing the same
US20100322792A1 (en) * 2004-11-04 2010-12-23 Sun Pleasure Company Ltd. Blower
JP2014105641A (ja) * 2012-11-28 2014-06-09 Max Co Ltd 羽根車及び送風装置
US20140314572A1 (en) * 2013-04-23 2014-10-23 Dresser-Rand Company Impeller internal thermal cooling holes
US8998588B2 (en) 2011-08-18 2015-04-07 General Electric Company Segmented fan assembly
US20150260201A1 (en) * 2014-03-11 2015-09-17 Revcor, Inc. Blower Assembly And Method
US20150337855A1 (en) * 2014-05-20 2015-11-26 Ajung Tech Co., Ltd. Installation structure for drive motor of double suction blower
US20160177966A1 (en) * 2014-12-18 2016-06-23 Samsung Electronics Co., Ltd. Centrifugal Fan Assembly
WO2020082913A1 (zh) * 2018-10-24 2020-04-30 珠海格力电器股份有限公司 离心风叶、离心风机和空调器
US10794399B2 (en) * 2017-10-19 2020-10-06 Wolong Electric Group Co., Ltd Convection fan and fan blade structure thereof
US11274677B2 (en) 2018-10-25 2022-03-15 Revcor, Inc. Blower assembly
US20220349420A1 (en) * 2021-04-30 2022-11-03 Coretronic Corporation Fan structure
US11644045B2 (en) 2011-02-07 2023-05-09 Revcor, Inc. Method of manufacturing a fan assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100413177B1 (ko) * 2001-10-17 2003-12-31 학교법인 선문학원 원심 다익 팬
JP5478465B2 (ja) * 2010-11-24 2014-04-23 三菱電機株式会社 多翼遠心ファン及び多翼遠心送風機

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2803398A (en) * 1956-05-11 1957-08-20 Vernco Corp Convex back plate blower wheel
US4428719A (en) * 1980-05-14 1984-01-31 Hitachi, Ltd. Brushless motor fan

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60132098A (ja) * 1983-12-21 1985-07-13 Matsushita Electric Works Ltd シロツコフアン
JPH10153192A (ja) * 1996-11-22 1998-06-09 Daikin Ind Ltd ターボファン及びそれを内装した天井設置型空気調和装置
KR100413177B1 (ko) * 2001-10-17 2003-12-31 학교법인 선문학원 원심 다익 팬

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2803398A (en) * 1956-05-11 1957-08-20 Vernco Corp Convex back plate blower wheel
US4428719A (en) * 1980-05-14 1984-01-31 Hitachi, Ltd. Brushless motor fan

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7062953B2 (en) * 2002-08-22 2006-06-20 Hochiki Corporation Sampling tube-type smoke detector
US20040035184A1 (en) * 2002-08-22 2004-02-26 Naoto Yamano Sampling tube-type smoke detector
US7244099B2 (en) * 2003-05-01 2007-07-17 Daikin Industries, Ltd. Multi-vane centrifugal fan
US20060198729A1 (en) * 2003-05-01 2006-09-07 Daikin Industries, Ltd. Multi-vane centrifugal blower
US7066712B2 (en) 2003-06-03 2006-06-27 Samsung Electronics Co., Ltd. Turbofan and air conditioner having the turbofan
US7070389B2 (en) 2003-06-03 2006-07-04 Samsung Electronics Co., Ltd. Turbofan and method of manufacturing the same
US20040258519A1 (en) * 2003-06-03 2004-12-23 Samsung Electronics Co., Ltd. Turbofan and method of manufacturing the same
US7121799B2 (en) * 2003-06-03 2006-10-17 Samsung Electronics Co., Ltd. Turbofan and mold manufacturing the same
US20040247441A1 (en) * 2003-06-03 2004-12-09 Samsung Electronics Co., Ltd. Turbofan and mold manufacturing the same
US20040244403A1 (en) * 2003-06-03 2004-12-09 Samsung Electronics Co., Ltd. Turbofan and air conditioner having the turbofan
US20050095132A1 (en) * 2003-11-04 2005-05-05 Delta Electronics, Inc. Centrifugal fan
US7399161B2 (en) * 2003-11-04 2008-07-15 Delta Electronics, Inc. Centrifugal fan
US20070251680A1 (en) * 2004-07-14 2007-11-01 Kanjirou Kinoshita Centrifugal Blower and Air Conditioner with Centrifugal Blower
US20060045143A1 (en) * 2004-08-24 2006-03-02 Serguei Anikitchev Wavelength-locked fiber-coupled diode-laser bar
US20060083610A1 (en) * 2004-10-19 2006-04-20 Denso Corporation Centrifugal blower
US7473078B2 (en) * 2004-10-19 2009-01-06 Denso Corporation Centrifugal blower
US20100322792A1 (en) * 2004-11-04 2010-12-23 Sun Pleasure Company Ltd. Blower
US7828640B2 (en) * 2005-11-01 2010-11-09 Sun Pleasure Company Limited Blower
US20070099554A1 (en) * 2005-11-01 2007-05-03 Hesheng Liang Blower
US20090022588A1 (en) * 2007-07-16 2009-01-22 Topower Computer Industrial Co., Ltd. Electric fan module and airflow conduction structure thereof
US20090113924A1 (en) * 2007-11-05 2009-05-07 Jun Ho Bae Apparatus for storing food and method for manufacturing the same
US8196427B2 (en) * 2007-11-05 2012-06-12 Lg Electronics Inc. Apparatus for storing food and method for manufacturing the same
EP2205914B1 (en) * 2007-11-05 2019-11-06 LG Electronics Inc. Apparatus for storing food and method for manufacturing the same
US11644045B2 (en) 2011-02-07 2023-05-09 Revcor, Inc. Method of manufacturing a fan assembly
US8998588B2 (en) 2011-08-18 2015-04-07 General Electric Company Segmented fan assembly
JP2014105641A (ja) * 2012-11-28 2014-06-09 Max Co Ltd 羽根車及び送風装置
US9568016B2 (en) * 2013-04-23 2017-02-14 Dresser-Rand Company Impeller internal thermal cooling holes
US20140314572A1 (en) * 2013-04-23 2014-10-23 Dresser-Rand Company Impeller internal thermal cooling holes
US9995316B2 (en) * 2014-03-11 2018-06-12 Revcor, Inc. Blower assembly and method
US20150260201A1 (en) * 2014-03-11 2015-09-17 Revcor, Inc. Blower Assembly And Method
US20150337855A1 (en) * 2014-05-20 2015-11-26 Ajung Tech Co., Ltd. Installation structure for drive motor of double suction blower
US20160177966A1 (en) * 2014-12-18 2016-06-23 Samsung Electronics Co., Ltd. Centrifugal Fan Assembly
US10161412B2 (en) * 2014-12-18 2018-12-25 Samsung Electronics Co., Ltd. Centrifugal fan assembly
US20190093666A1 (en) * 2014-12-18 2019-03-28 Samsung Electronics Co., Ltd. Centrifugal fan assembly
US10954955B2 (en) * 2014-12-18 2021-03-23 Samsung Electronics Co., Ltd. Centrifugal fan assembly
US10794399B2 (en) * 2017-10-19 2020-10-06 Wolong Electric Group Co., Ltd Convection fan and fan blade structure thereof
WO2020082913A1 (zh) * 2018-10-24 2020-04-30 珠海格力电器股份有限公司 离心风叶、离心风机和空调器
US11274677B2 (en) 2018-10-25 2022-03-15 Revcor, Inc. Blower assembly
US11732730B2 (en) 2018-10-25 2023-08-22 Revcor, Inc. Blower assembly
US20220349420A1 (en) * 2021-04-30 2022-11-03 Coretronic Corporation Fan structure
US11939990B2 (en) * 2021-04-30 2024-03-26 Coretronic Corporation Fan structure

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Publication number Publication date
KR100413177B1 (ko) 2003-12-31
JP2003120587A (ja) 2003-04-23
KR20030032232A (ko) 2003-04-26

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