(19)
(11) EP 1 422 425 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.01.2005 Bulletin 2005/03

(43) Date of publication A2:
26.05.2004 Bulletin 2004/22

(21) Application number: 03016732.4

(22) Date of filing: 22.07.2003
(51) International Patent Classification (IPC)7: F04D 29/38, F04D 29/66
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 19.11.2002 KR 2002071993

(71) Applicant: LG Electronics Inc.
Seoul 150-010 (KR)

(72) Inventors:
  • Chin, Sim Won
    Kyung-gi do 423-030 (KR)
  • Chung, Moon Kee
    Seoul-si 150-082 (KR)

(74) Representative: TER MEER STEINMEISTER & PARTNER GbR 
Patentanwälte, Mauerkircherstrasse 45
81679 München
81679 München (DE)

   


(54) Axial-flow fan


(57) Disclosed is an axial-flow fan comprising a hub (52) and a plurality of blades (54) located on an outer circumference of the hub so as to axially blow air. Each blade (54) includes a positive pressure side (54d) to which high pressure of the air is applied, a negative pressure side (54e) to which low pressure of the air is applied, and a protuberance (56) formed on the positive pressure side (54d) so as to reduce the difference of pressure between the positive and negative pressure sides. The axial-flow fan reduces the amount of an airflow flowing along the positive pressure sides (54d) at blade tips (54c), and causes air to effectively flow at the blade tips (54c), thereby reducing the difference of pressure between the positive pressure sides (54d) and the negative pressure sides (54e) at the blade tips (54c) and preventing the occurrence of a vortex generated at the blade tips (54c). Further, the axial-flow fan slows down the restoration to the static pressure of air flowing between the positive pressure sides to the negative pressure sides at the blade tips of blades, thereby reducing the noise generated by the operation of the fan.






Search report