(19)
(11) EP 0 602 007 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.12.1994 Bulletin 1994/52

(43) Date of publication A2:
15.06.1994 Bulletin 1994/24

(21) Application number: 94101775.8

(22) Date of filing: 03.07.1991
(51) International Patent Classification (IPC)5: A47L 5/22, A47L 9/00
(84) Designated Contracting States:
DE GB

(30) Priority: 20.07.1990 JP 190540/90

(62) Application number of the earlier application in accordance with Art. 76 EPC:
91306038.0 / 0467557

(71) Applicant: HITACHI, LTD.
Chiyoda-ku, Tokyo 101 (JP)

(72) Inventors:
  • Iwase, Yukiji
    Usiku-shi, Ibaraki 300-12 (JP)
  • Sato, Shigenori
    Niihari-gun, Ibaraki 319-01 (JP)
  • Sunagawa, Masao
    Ibaraki 310 (JP)
  • Toyoshima, Hisanori
    Hitachi-shi, Ibaraki 316 (JP)

(74) Representative: Paget, Hugh Charles Edward et al
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)


(56) References cited: : 
   
     
    Remarks:
    This application was filed on 07 - 02 - 1994 as a divisional application to the application mentioned under INID code 60.
     


    (54) Vacuum cleaner having an impeller and diffuser


    (57) A vacuum cleaner blower assembly has a blower motor (81), a vaned centrifugal impeller (90) driven by the blower motor (81) and an air diffuser (89) radially beyond the periphery of the impeller. In order to improve air flow efficiency at the impeller inlet and outlet, the air diffuser (89) has vanes (94) with an inlet angle in the range 1 to 4°.






    Search report