EP1726832B1 - Lüfter und dessen Schaufel - Google Patents

Lüfter und dessen Schaufel Download PDF

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Publication number
EP1726832B1
EP1726832B1 EP06010115A EP06010115A EP1726832B1 EP 1726832 B1 EP1726832 B1 EP 1726832B1 EP 06010115 A EP06010115 A EP 06010115A EP 06010115 A EP06010115 A EP 06010115A EP 1726832 B1 EP1726832 B1 EP 1726832B1
Authority
EP
European Patent Office
Prior art keywords
blade
turbo fan
air
width
extending portion
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 - Fee Related
Application number
EP06010115A
Other languages
English (en)
French (fr)
Other versions
EP1726832A3 (de
EP1726832A2 (de
Inventor
Ki Young Moon
Ki Su Hong
Jung Hoon 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
Publication of EP1726832A2 publication Critical patent/EP1726832A2/de
Publication of EP1726832A3 publication Critical patent/EP1726832A3/de
Application granted granted Critical
Publication of EP1726832B1 publication Critical patent/EP1726832B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • 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
    • F04D29/30—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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction
    • 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • 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
    • 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
    • F05D2210/00—Working fluids
    • F05D2210/10—Kind or type
    • F05D2210/12—Kind or type gaseous, i.e. compressible
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S416/00—Fluid reaction surfaces, i.e. impellers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

Definitions

  • the present invention relates to a turbo fan, and more particularly, to a turbo fan with improved guiding efficiency of air blown by the fan blades to reduce noise and increase the amount of air blown.
  • a turbo fan is used in picture frame-type indoor units of air conditioners and in other devices, and suctions air in the direction of the rotating shaft and expels air in a radial direction from the blades.
  • turbo fans suction and forcibly push and expel the air with their rotating blades. The quantity of air blown depends on the rotating speed of the turbo fan.
  • US 4,838,760 discloses that a web has a post at an upstream end, a notch at a downstream end, and an inclined part therebetween, and there is provided a step in each transition area.
  • the present invention is directed to a turbo fan that substantially obviates one or more problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a turbo fan that operates with reduced noise and blows a greater amount of air.
  • Another object of the present invention is to provide a turbo fan with a limited increase in its diameter and overall thickness, while increasing its capacity for blowing air without increasing its rotational speed.
  • a turbo fan including: a plurality of blades; a shroud provided at ends of the blades for guiding a flow of suctioned air; and a circular hub for guiding a discharging of the suctioned air, wherein the blade includes a leading edge formed wider than a trailing edge thereof.
  • a blade of a turbo fan for suctioning air at a rotating shaft thereof and discharging the air in a radial direction thereof, the blade including: a first extending portion having a larger width; and a second extending portion having a width smaller than the larger width.
  • the present invention provides a turbo fan with a reduced level of operating noise while increasing the quantity of air that it blows - especially while retaining the same overall dimensions and rotating speed of a conventional turbo fan.
  • Fig. 1 is a perspective view of a turbo fan according to the present invention
  • Fig. 2 is a perspective view of a turbo fan according to the present invention covered with a casing
  • Fig. 3 is a sectional view of Fig. 1 taken along line I-I'.
  • Fig. 1 is a perspective view of a turbo fan according to the present invention.
  • a turbo fan 1 includes a shroud 2, a plurality of blades 4 provided beneath the shroud 2 for forcibly blowing air, a hub formed below the blades 4 for guiding the direction in which air is discharged, and a motor mounting portion 9 formed at the center of the hub 3 for connecting to a rotating shaft.
  • the rotating shaft of a motor connects to the mounting portion 9 to impart its rotating force on the hub 3.
  • turbo fan in Fig. 1 when the turbo fan in Fig. 1 is installed and rotates, outside air enters the turbo fan downward from above, and is compressed and blown in a centrifugal direction by the blades 4. The compressed and blown air is expelled through the spaces formed by the blades 4 between the shroud 2 and the hub 3 at the outer edge of the turbo fan 1.
  • the quantity of blown air resulting from the above airflow is dependant on the width of the blade surfaces 3. That is, the wider the area of the blade surface 3, the larger the quantity of blown air is.
  • Fig. 2 is a perspective view of a turbo fan according to the present invention covered with a casing.
  • a casing 10 is provided at the intake side of the turbo fan 1 to support the entire turbo fan 1 and guide the suctioning and flow of air.
  • the present invention increases the width of the blades 4 (or the width of the blade surface 8) to increase the output of blown air without raising the rpms. That is, the present invention improves the shape of the blades 4, keeping in mind that the larger the area of the blade surface 8, the greater the amount of air is blown.
  • the present invention provides a blade 4 with a shape that follows the path of airflow in order to reduce noise.
  • the present invention uses a blade 4 having a special shape, which will be described below in detail.
  • Fig. 3 is a sectional view of Fig. 1 taken along line I-I'.
  • the blade 4 according to the present invention is provided between the shroud 2 and the hub 3, with the casing 10 (see Fig. 2 ) of a predetermined size mounted above the top surface of the shroud 2.
  • the blade 4 has a span (width) that is greater at the side for intaking air formed by the hole in the casing 10 than toward the discharging end thereof.
  • the width W1 of the blade 4 at the intake portion is greater than the width W2 of the blade at the discharging end.
  • the width of the blade 4 at its leading edge 5 is formed to be greater than that at its trailing edge 7.
  • This shape is provided because when the blade 4 is wide at the portion where the casing 10 is, vibration causes the blade 4 and the casing 10 to collide, leading to unreliable operation.
  • the width of the blade at the suctioning portion thereof By thus increasing the width of the blade at the suctioning portion thereof, the area of the blade surface 8 increases and the flow of air can be guided more smoothly. Also, a larger quantity of air is blown and operating noise is reduced. In this case, even when the width W1 of the blade 4 increases at the suctioning portion, the overall size of the fan is not greatly affected, so that there is no increase in the overall size of the turbo fan.
  • the upper portion 6 of the blade extends unevenly. That is, the upper portion 6 of the blade has a first extending portion 11 provided close to the suctioning portion, and a second extending portion 13 provided at the end for discharging air.
  • a connecting portion 12 is provided between the first extending portion 11 and the narrower second extending portion 13 to connect the two extending portions.
  • the extending portions 11 and 13 respectively extend a predetermined length at a uniform width. That is, the extending portions 11 and 13 extend in parallel to the hub 3.
  • the reason that the extended portions 11 and 13 are provided to respectively extend uniformly is to allow the air to be blown in a centrifugal direction without escaping from the edges of the fan.
  • the width W1 of the first extending portion is greater than the width W2 of the second extending portion, the area of the blade surface 8 increases, and air is smoothly guided in the discharging direction as explained above.
  • the connecting portion 12 smoothly connects the first and second extending portions 11 and 13, so that the air stream is minimally disturbed.
  • the flow of air can be smoothly guided, and noise can be reduced.
  • connecting portion 12 were to be formed in an abruptly stepped shape, air flowing along the blade surface 8 would likely leak outside of the blade surface 8, reducing the amount of blown air and increasing noise.
  • the smooth transitioning shape of the connecting portion 12 substantially reduces noise over turbo fans according to the related art, in which the outer end of the blade is abruptly recessed according to the bend of the shroud or is stepped (which produces a sudden increase in noise when the rotating speed of the fan increases).
  • the connecting portion 12 reduces the amount of noise emitted.
  • the thickness of the turbo fan 1 according to the present invention is the same as turbo fans according to the related art, the amount of blown air increases and the noise level decreases in comparison, without increasing the rotating speed of the fan.
  • the size of the turbo fan 1 does not increase, and the overall width of the blades does not increase, so that the turbo fan 1 cannot be compared to other products, whose overall size increases due to an increase in the space taken up by the fan.
  • the space in which the turbo fan 1 is installed and the overall size of the turbo fan 1 do not change, while the amount of air blown increases and the amount of generated noise decreases.
  • the turbo fan according to the present invention displays maximum results.
  • H height
  • D distance
  • the turbo fan according to the present invention displays maximum results.
  • the increase in blown air quantity and decrease in generated noise are readily apparent, as illustrated by testing.
  • a test reveals that a turbo fan with a ratio of 0.1 or less according to the present invention, when displacing 9.5cm/m (cubic meters per minute) of air, generates 42dB, compared to 43dB generated by a conventional turbo fan with the same ratio.
  • the ratio 0.1 applies to turbo fans that are thin overall - i.e., turbo fans employed in indoor wallmounted units for split system air conditioners.
  • the turbo fan according to the present invention improves the quantity of blown air and decreases the amount of generated noise. Because a reduction in noise can be obtained for a turbo fan according to the present invention over a conventional turbo fan of the same size, the overall performance level of the inventive turbo fan can be raised.

Landscapes

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

Claims (8)

  1. Radialturbolüfter (1) mit:
    mehreren Schaufeln (4),
    einem an den Enden der Schaufeln vorgesehenen Kragen (2) zum Leiten eines Stroms angesaugter Luft und
    einer kreisförmigen Nabe (3) zum Leiten einer Abgabe der angesaugten Luft,
    wobei die Schaufel eine Vorderkante (5) aufweist, die breiter als eine Hinterkante (7) von ihr ausgebildet ist,
    dadurch gekennzeichnet, dass sich die Breite der Vorderkante (5) und die Breite der Hinterkante (7) jeweils über vorbestimmte Längen erstrecken und die Breite der Vorderkante (5) über einen vorbestimmten Neigungswinkel zur Breite der Hinterkante (7) sanft reduziert ist.
  2. Radialturbolüfter nach Anspruch 1, wobei die Schaufel (4) eine Oberkante aufweist, die sich nicht völlig in einer Geraden erstreckt.
  3. Radialturbolüfter nach Anspruch 1, wobei die Schaufel (4) ferner einen ersten Abschnitt und einen zweiten Abschnitt aufweist, wobei der erste Abschnitt breiter als der zweite Abschnitt ist und sich weiter als dieser erstreckt.
  4. Schaufel (4) eines Radialturbolüfters (1) zum Ansaugen von Luft an einer Drehwelle davon und Abgeben der Luft in Radialrichtung davon, wobei die Schaufel aufweist:
    einen ersten sich erstreckenden Abschnitt (11) mit einer Breite; und
    einen zweiten sich erstreckenden Abschnitt (13) mit einer Breite, die kleiner als die Breite des ersten sich erstreckenden Abschnitts (11) ist,
    gekennzeichnet durch:
    einen Verbindungsabschnitt (12), der sich sanft krümmt, um den ersten sich erstreckenden Abschnitt (11) mit dem zweiten sich erstreckenden Abschnitt (13) zu verbinden.
  5. Schaufel nach Anspruch 4, wobei der erste sich erstreckende Abschnitt (11) an einer Mitte des Turbolüfters gebildet ist und der zweite sich erstreckende Abschnitt (13) an einer Kante des Turbolüfters gebildet ist.
  6. Schaufel nach Anspruch 4, ferner mit:
    einer an einem unteren Ende der Schaufel (4) angebrachten Nabe (3) zum Leiten eines Stroms abgegebener Luft; und
    einem an einer oberen Außenkante der Schaufel (4) angebrachten Kragen (2) zum Leiten eines Stroms angesaugter Luft, wobei sich der zweite sich erstreckende Abschnitt (13) über eine vorbestimmte Entfernung vom Kragen (2) zur Drehwelle erstreckt.
  7. Schaufel nach Anspruch 4, wobei der Verbindungsabschnitt (13) an einer Position gebildet ist, die näher an einem Außenende der Schaufel (4) als an einem Innenende der Schaufel liegt.
  8. Schaufel nach Anspruch 4, wobei die Schaufel (4) ein Verhältnis von Entfernung zu Höhe (D/H) von höchstens 0,1 hat.
EP06010115A 2005-05-17 2006-05-16 Lüfter und dessen Schaufel Expired - Fee Related EP1726832B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020050041005A KR100654993B1 (ko) 2005-05-17 2005-05-17 터보팬

Publications (3)

Publication Number Publication Date
EP1726832A2 EP1726832A2 (de) 2006-11-29
EP1726832A3 EP1726832A3 (de) 2011-05-11
EP1726832B1 true EP1726832B1 (de) 2012-05-16

Family

ID=36694189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06010115A Expired - Fee Related EP1726832B1 (de) 2005-05-17 2006-05-16 Lüfter und dessen Schaufel

Country Status (2)

Country Link
EP (1) EP1726832B1 (de)
KR (1) KR100654993B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016107656A1 (de) * 2016-04-25 2017-10-26 Ebm-Papst Mulfingen Gmbh & Co. Kg Schaufelkantengeometrie einer Schaufel eines Luftförderrads

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100582492C (zh) * 2007-06-22 2010-01-20 富准精密工业(深圳)有限公司 扇叶结构及采用该扇叶结构的离心风扇
TWI490412B (zh) * 2012-09-18 2015-07-01 Asustek Comp Inc 離心式風扇

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE958147C (de) * 1955-05-01 1957-02-14 Siemens Ag Schaufelrad fuer Geblaese, insbesondere fuer Staubsauger
DE1503633A1 (de) * 1965-08-05 1969-03-13 Union Sils Van De Loo & Co Doppelseitig ansaugendes Laufrad fuer Radialgeblaese,insbesondere fuer Heizluefter
US4838760A (en) * 1987-04-27 1989-06-13 Bendix Electronics Limited Fan with motor cooling enhancement
DE29922599U1 (de) * 1999-12-23 2001-05-03 Mulfingen Elektrobau Ebm Radialventilator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016107656A1 (de) * 2016-04-25 2017-10-26 Ebm-Papst Mulfingen Gmbh & Co. Kg Schaufelkantengeometrie einer Schaufel eines Luftförderrads

Also Published As

Publication number Publication date
KR100654993B1 (ko) 2006-12-06
EP1726832A3 (de) 2011-05-11
EP1726832A2 (de) 2006-11-29
KR20060118713A (ko) 2006-11-24

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