(19)
(11) EP 0 772 007 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.05.2000 Bulletin 2000/18

(43) Date of publication A2:
07.05.1997 Bulletin 1997/19

(21) Application number: 96117214.5

(22) Date of filing: 26.10.1996
(51) International Patent Classification (IPC)7: F24F 7/007, E21F 1/00, F04D 29/54
(84) Designated Contracting States:
DE FR GB

(30) Priority: 30.10.1995 JP 28128295

(71) Applicant: MATSUSHITA SEIKO CO., LTD.
Osaka-shi, Osaka 536 (JP)

(72) Inventors:
  • Murayama, Masaru
    Inuyama-shi, Aichi 484 (JP)
  • Kondo, Shigeki
    Komaki-shi, Aichi 485 (JP)

(74) Representative: Eisenführ, Speiser & Partner 
Martinistrasse 24
28195 Bremen
28195 Bremen (DE)

   


(54) Jet fan


(57) A jet fan includes a generally cylindrical casing (1), an electric motor (2) accommodated therein, an impeller (3) connected to the electric motor (2), and at least one booster ring (8) disposed concentrically with the casing (1) and located downstream thereof with respect to a direction of an air flow. The booster ring (8) has an aerofoil or arcuated plate sectional profile as viewed in a direction transverse to a longitudinal axis of the casing (1). The booster ring (8) has an upper surface of aerofoil or arcuated plate sectional profile as its inner surface, and also has a leading edge facing an air outlet of the jet fan and a trailing edge of a diameter smaller than that of the leading edge but greater than that of the air outlet.






Search report