US20120027597A1 - Centrifugal fan - Google Patents

Centrifugal fan Download PDF

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Publication number
US20120027597A1
US20120027597A1 US13/181,108 US201113181108A US2012027597A1 US 20120027597 A1 US20120027597 A1 US 20120027597A1 US 201113181108 A US201113181108 A US 201113181108A US 2012027597 A1 US2012027597 A1 US 2012027597A1
Authority
US
United States
Prior art keywords
centrifugal fan
blade
auxiliary
blades
hub
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
US13/181,108
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English (en)
Inventor
Myoungju KANG
Jindong KIM
Hosan KIM
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANG, MYOUNGJU, KIM, HOSAN, KIM, JINDONG
Publication of US20120027597A1 publication Critical patent/US20120027597A1/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
    • F04D29/26—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
    • 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
    • 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
    • F04D29/30—Vanes
    • 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
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes

Definitions

  • the present invention relates to a centrifugal fan.
  • a centrifugal fan suctions air in an axial direction and discharges the air in a radial direction.
  • the centrifugal fan may be mounted on an evaporation chamber or a machine chamber of an air conditioner and a refrigerator.
  • an area of a cooled air passage is decreased in order to increase a volume in the refrigerator, such that a passage resistance is increased.
  • a centrifugal fan having a high constant pressure property is generally used.
  • the present invention has been made in an effort to solve the problems.
  • An exemplary embodiment of the present invention provides a centrifugal fan including: a hub penetrated by a rotational axis; a plurality of main blades extended in a radial direction from a predetermined point of the top of the hub; a bell mouth formed on a top of the exteriors of the plurality of main blades; and a plurality of auxiliary blades extended in the radial direction between the plurality of main blades, wherein a ratio (D 1 /D 2 ) of an inner diameter D 1 to an outer diameter D 1 of each of the auxiliary blades is in the range of 07 to 0.9.
  • a constant pressure and a flow rate of a fan are increased by installing an auxiliary blade between main blades.
  • a velocity distribution of a flow discharged through a trailing edge of the auxiliary blade is substantially uniform, such that a pressure difference between an upper side and a lower side of the trailing edge is minimized, and as a result, a flow property in which the discharged air flows backward is improved.
  • FIG. 1 is a perspective view of a centrifugal fan according to an exemplary embodiment of the present invention.
  • FIG. 2 is a plan view of a centrifugal fan according to an exemplary embodiment of the present invention.
  • FIG. 3 is a bottom view of a centrifugal fan according to an exemplary embodiment of the present invention.
  • FIG. 4 is a side view of a centrifugal fan according to an exemplary embodiment of the present invention.
  • FIG. 5 is a graph showing a comparison of a flow rate for each rpm between a centrifugal fan according to an exemplary embodiment of the present invention and a general centrifugal fan with no auxiliary blade.
  • FIG. 6 is a graph showing a comparison of noise for each frequency between a centrifugal fan according to an exemplary embodiment of the present invention and a general centrifugal fan with no auxiliary blade.
  • FIG. 1 is a perspective view of a centrifugal fan according to an exemplary embodiment of the present invention
  • FIG. 2 is a plan view of a centrifugal fan according to an exemplary embodiment of the present invention
  • FIG. 3 is a bottom view of a centrifugal fan according to an exemplary embodiment of the present invention.
  • the centrifugal fan 10 includes a hub 11 penetrated by a rotational axis and having a circular cone shape in which a diameter increases toward the bottom, a blade extended with being rounded in a radial direction at an edge of the hub, and a bell mouth 14 formed on the top of the blade.
  • the blade includes main blades 12 extended from the edge of the bottom of the hub and auxiliary blades 13 each of which the top is connected to the bottom of the bell mouth 14 .
  • the auxiliary blade 13 is provided between the main blade 12 to improve flow loss caused by a difference in velocity and pressure between an upper side and a lower side of a trailing edge of the blade.
  • the hub 11 has the circular cone shape in which the diameter increases toward the bottom to serve to diffuse air suctioned in a rotational axial direction to a radial direction.
  • the main blade 12 extends in the radial direction starting from a point spaced apart toward the center from the edge of the bottom of the hub 11 by a predetermined distance.
  • the main blade 12 is extended with being rounded at a predetermined curvature.
  • the auxiliary blade 13 is shorter than the main blade 12 and does not contact the hub 11 . That is, the auxiliary blade 13 is connected to only the bell mouth 14 .
  • an outer diameter of the bell mouth 14 is larger than that of the bottom of the hub 11 .
  • the inner edge of the bell mouth 14 is rounded in an extending direction of the rotational axis of the hub 11 .
  • the inner edge of the bell mouth 14 is extended by a predetermined length with being rounded toward the top of the hub 11 .
  • an end of the main blade at the side of the hub 11 may be defined as a leading edge 121 and an opposite end to the leading edge 121 may be defined as a trailing edge 122 .
  • both ends of the auxiliary blade 13 may also be defined as a leading edge 131 and a trailing edge 132 .
  • a diameter D 1 of a circumference linking the leading edges of the auxiliary blades 13 may be substantially equal to or larger than the diameter of the bottom of the hub 11 .
  • the trailing edges 122 and 132 of the main blade 12 and the auxiliary blade 13 are positioned on the same circumference and may be substantially equal to the diameter D 2 of the bell mouth 14 .
  • the diameter of the circumference passing the leading edges 131 of the auxiliary blades 13 may be represented by D 1 and the diameter of the circumference passing the trailing edges 132 may be represented by D 2 .
  • the diameter D 1 of the circumference passing the leading edges 131 of the auxiliary blades 13 may be equal to or larger than an inner diameter of the bell mouth 14 .
  • the auxiliary blade 13 may be interposed between one or two or more main blades 12 .
  • the diameter D 1 of the circumference passing the leading edges 131 of the auxiliary blade 13 is defined as an inner diameter of the auxiliary blade 13 and the diameter D 2 of the circumference passing the trailing edges 132 is defined as an outer diameter of the auxiliary blade 13 .
  • the inner diameter D 1 of the auxiliary blade 13 may be larger than the diameter of the circumference linking the leading edges 121 of the main blade 12 , i.e., an inner diameter of the main blade 12 .
  • a ratio (D 1 /D 2 ) of the inner diameter to the outer diameter of the auxiliary blade 13 is preferably in the range of 0.7 to 0.9 and this is a result extracted through tests performed at several times.
  • FIG. 4 is a side view of a centrifugal fan according to an exemplary embodiment of the present invention.
  • the auxiliary blade 13 is extended by a predetermined length toward the bottom of the hub 11 from the bottom of the bell mouth 14 .
  • a length from an upper end to a lower end of the trailing edge 132 of the auxiliary blade 13 is defined as a width W 1 of the trailing edge 132 of the auxiliary blade 13 .
  • the width W 1 may be the height of the trailing edge 132 from the bottom of the bell mouth 14 .
  • the main blade 12 is extended from a predetermined point of the top of the hub 11 . Further, a length from an upper end to a lower end of the trailing edge 122 of the main blade 12 is defined as a width W 2 of the trailing edge 122 of the auxiliary blade 12 . In another aspect, the width W 2 may be the height of the trailing edge 122 from the bottom of the bell mouth 14 .
  • a ratio (W 1 /W 2 ) of the trailing edge 132 of the auxiliary blade 13 to the width of the trailing edge 122 of the main blade 12 is preferably in the range of 0.45 to 0.65 and this is also a result extracted through tests performed at several times.
  • FIG. 5 is a graph showing a comparison of a flow rate for each rpm between a centrifugal fan according to an exemplary embodiment of the present invention and a general centrifugal fan with no auxiliary blade.
  • a flow rate generated by the centrifugal fan 10 according to the exemplary embodiment of the present invention is more than that of the general centrifugal fan in the same rpm. Accordingly, when the same flow rate is generated, since the rpm of the centrifugal fan 10 of the exemplary embodiment of the present invention may be set to be less than that of the general centrifugal fan, power consumption can be reduced.
  • FIG. 6 is a graph showing a comparison of noise for each frequency between a centrifugal fan according to an exemplary embodiment of the present invention and a general centrifugal fan with no auxiliary blade.
  • a sound pressure level (SPL) generated in the centrifugal fan 10 according to the exemplary embodiment of the present invention is lower than that of the general centrifugal fan under the same frequency.
  • centrifugal fan 10 This means that the magnitude of noise generated in the centrifugal fan 10 is smaller than that of the general centrifugal fan at the same rpm or frequency. Accordingly, fan noise can be reduced by using the centrifugal fan 10 according to the exemplary embodiment of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US13/181,108 2010-07-27 2011-07-12 Centrifugal fan Abandoned US20120027597A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100072163A KR20120010684A (ko) 2010-07-27 2010-07-27 원심팬
KR10-2010-0072163 2010-07-27

Publications (1)

Publication Number Publication Date
US20120027597A1 true US20120027597A1 (en) 2012-02-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US13/181,108 Abandoned US20120027597A1 (en) 2010-07-27 2011-07-12 Centrifugal fan

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US (1) US20120027597A1 (ko)
KR (1) KR20120010684A (ko)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102996506A (zh) * 2012-11-28 2013-03-27 李起武 一种风扇
US20160312796A1 (en) * 2015-04-24 2016-10-27 Briggs & Stratton Corporation Reverse fin cooling fan
CN106855055A (zh) * 2015-12-09 2017-06-16 苏州三星电子有限公司 双级离心风扇、风机及空调器
US9926832B2 (en) 2015-04-24 2018-03-27 Briggs & Stratton Corporation Reverse fin cooling fan
CN111425452A (zh) * 2019-01-10 2020-07-17 苏州市春菊电器有限公司 一种用于吸尘器的长短叶片动叶轮
USD949315S1 (en) 2016-06-24 2022-04-19 Ebm-Papst Mulfingen Gmbh & Co. Kg Vane damper with trailing edge
US11708837B2 (en) * 2021-01-26 2023-07-25 Regal Beloit America, Inc. Fan and electric machine assembly and methods therefor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102210542B1 (ko) * 2015-05-19 2021-02-02 엘지전자 주식회사 원심팬

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521154A (en) * 1982-01-13 1985-06-04 Corbett Reg D Centrifugal fans
US5545008A (en) * 1994-04-25 1996-08-13 Sulzer Pumpen Ag Method and apparatus for conveying a fluid
JP2000240590A (ja) * 1999-02-23 2000-09-05 Hitachi Ltd 多翼前向ファン
JP2006077631A (ja) * 2004-09-08 2006-03-23 Matsushita Electric Ind Co Ltd 遠心型送風機の羽根車
US7108482B2 (en) * 2004-01-23 2006-09-19 Robert Bosch Gmbh Centrifugal blower
US7597541B2 (en) * 2005-07-12 2009-10-06 Robert Bosch Llc Centrifugal fan assembly
US8128369B2 (en) * 2008-04-15 2012-03-06 Minebea Co., Ltd. Blower impeller with partial tip blockage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521154A (en) * 1982-01-13 1985-06-04 Corbett Reg D Centrifugal fans
US5545008A (en) * 1994-04-25 1996-08-13 Sulzer Pumpen Ag Method and apparatus for conveying a fluid
JP2000240590A (ja) * 1999-02-23 2000-09-05 Hitachi Ltd 多翼前向ファン
US7108482B2 (en) * 2004-01-23 2006-09-19 Robert Bosch Gmbh Centrifugal blower
JP2006077631A (ja) * 2004-09-08 2006-03-23 Matsushita Electric Ind Co Ltd 遠心型送風機の羽根車
US7597541B2 (en) * 2005-07-12 2009-10-06 Robert Bosch Llc Centrifugal fan assembly
US8128369B2 (en) * 2008-04-15 2012-03-06 Minebea Co., Ltd. Blower impeller with partial tip blockage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Sakai, Impeller for Centrifugal Blower, March 23, 2006, Abstract of JP 2006-077631 *
Yamazaki, Multiblade forward fan, September 5, 2000, Abstract of JP 2000-240590A *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102996506A (zh) * 2012-11-28 2013-03-27 李起武 一种风扇
US20160312796A1 (en) * 2015-04-24 2016-10-27 Briggs & Stratton Corporation Reverse fin cooling fan
US9926832B2 (en) 2015-04-24 2018-03-27 Briggs & Stratton Corporation Reverse fin cooling fan
US10167766B2 (en) * 2015-04-24 2019-01-01 Briggs & Stratton Corporation Reverse fin cooling fan
CN106855055A (zh) * 2015-12-09 2017-06-16 苏州三星电子有限公司 双级离心风扇、风机及空调器
USD949315S1 (en) 2016-06-24 2022-04-19 Ebm-Papst Mulfingen Gmbh & Co. Kg Vane damper with trailing edge
CN111425452A (zh) * 2019-01-10 2020-07-17 苏州市春菊电器有限公司 一种用于吸尘器的长短叶片动叶轮
US11708837B2 (en) * 2021-01-26 2023-07-25 Regal Beloit America, Inc. Fan and electric machine assembly and methods therefor

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AS Assignment

Owner name: LG ELECTRONICS INC., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KANG, MYOUNGJU;KIM, JINDONG;KIM, HOSAN;REEL/FRAME:026585/0734

Effective date: 20110708

STCB Information on status: application discontinuation

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