(19)
(11) EP 0 955 469 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.02.2001 Bulletin 2001/09

(43) Date of publication A2:
10.11.1999 Bulletin 1999/45

(21) Application number: 99106357.9

(22) Date of filing: 29.03.1999
(51) International Patent Classification (IPC)7: F04D 29/38
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 14.04.1998 JP 10234498

(71) Applicant: Matsushita Electric Industrial Co., Ltd.
Kadoma-shi, Osaka 571-8501 (JP)

(72) Inventors:
  • Izumi, Yoshiki
    Kyoto-shi, Kyoto, 607 (JP)
  • Sugio, Takashi
    Kusatsu-shi, Shiga, 525 (JP)

(74) Representative: Kügele, Bernhard et al
NOVAPAT INTERNATIONAL SA, 9, Rue du Valais
1202 Genève
1202 Genève (CH)

   


(54) Impeller of fan


(57) An impeller of a fan includes hub (3) mounted with plural blades (2). The fan blows air by spinning the blades. A revolution locus of a leading edge (6) of blade (2) shows a valley in a portion between around a center and tip (8) of blade (2), and shows a peak in a portion between around the center and hub (3), with regard to windward. A cross sectional view of blade (2) in a radial direction shows a valley in a portion between around a center and tip (8), and shows a peak in a portion between around the center of blade (2) and hub (3). This structure realizes to lower the noise level and to increase the static pressure.






Search report