(19)
(11) EP 0 467 336 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.04.1992 Bulletin 1992/16

(43) Date of publication A2:
22.01.1992 Bulletin 1992/04

(21) Application number: 91111960.0

(22) Date of filing: 17.07.1991
(51) International Patent Classification (IPC)5: F04D 19/00, F04D 25/08
(84) Designated Contracting States:
CH DE FR GB LI

(30) Priority: 18.07.1990 JP 189868/90
25.09.1990 JP 254498/90

(60) Divisional application:
94102599.1 / 0606108

(71) Applicant: FUJI ELECTRIC CO., LTD.
Kawasaki-shi Kanagawa 210 (JP)

(72) Inventors:
  • Nishi, Michihiro
    Kitakyushu-shi, Fukuoka (JP)
  • Niikura, Yoshiyuki, c/o Fuji Electric Co., Ltd.
    Kawasaki-shi, Kanagawa (JP)
  • Tsukamoto, Tadashi, c/o Fuji Electric Co., Ltd.
    Kawasaki-shi, Kanagawa (JP)
  • Suzuki, Ryoji, c/o Fuji Electric Co., Ltd.
    Kawasaki-shi, Kanagawa (JP)
  • Noguchi, Yokihiro, c/o Fuji Electric Co., Ltd.
    Kawasaki-shi, Kanagawa (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) Bi-directional axial-flow blower


    (57) A bi-directional axial-flow blower which requires no complex mechanism such as a rotor-reversing mechanism and employs a proper shape of rotor to enables air-blowing operation with high efficiency and low noise both in the forward and reverse directions. The bi-directional axial-flow blower (1) for selectively sending a wind either in forward direction (A) or in a reverse direction (B), comprises a cylindrical casing (3), a forwardly-rotating impeller (8) and a reversely-rotating impeller (9) having airfoil blade rotors (8a, 9a) with camber, and a forward drive motor (6) for driving the forwardly-rotating impeller (8) and a reverse drive motor (7) for driving the reversely-rotating impeller (9), in which the forwardly-rotating impeller (8) is operated whereas the reversely-rotating impeller (9) is made free to rotate when the blower (1) is in the forward wind mode, and the reversely-rotating impeller (9) is operated and the forwardly-rotating impeller (8) is made free to rotate in the reverse wind mode.






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