(19)
(11) EP 2 000 070 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.10.2009 Bulletin 2009/42

(43) Date of publication A2:
10.12.2008 Bulletin 2008/50

(21) Application number: 08251979.4

(22) Date of filing: 06.06.2008
(51) International Patent Classification (IPC): 
A47L 9/00(2006.01)
F04D 29/44(2006.01)
 A47L 5/36(2006.01)
F04D 29/66(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 07.06.2007 JP 2007151937

(71) Applicants:
  • Kabushiki Kaisha Toshiba
    Minato-ku, Tokyo 105-8001 (JP)
  • Toshiba Consumer Electronics Holdings Corporation
    Tokyo 101-0021 (JP)
  • Toshiba Home Appliances Corporation
    Tokyo 101-0021 (JP)

(72) Inventor:
  • Oshikiri, Go c/o Intellectual Property Division
    Tokyo 105-8001 (JP)

(74) Representative: O'Connell, David Christopher 
Haseltine Lake LLP Redcliff Quay 120 Redcliff Street
Bristol BS1 6HU
Bristol BS1 6HU (GB)

   


(54) Motor blower and electric vacuum cleaner using same


(57) A motor blower (1) includes an electric motor (4) having a rotating shaft (3), a centrifugal blower (2) having a plurality of blower blades (34) and attached to the rotating shaft (3) of the electric motor (4), and a diffuser (21) having a plurality of diffuser blades (25) each of which is positioned at an outer peripheral portion of the centrifugal blower (21) so as to be opposed to air outlet portions formed to a circumferential surface of the centrifugal blower (21). Each of the blower blades (34) has a front end portion (34b) which is formed to almost linearly incline from one end portion toward another end portion of the blower blade (34). Due to the above structure, the motor blower (2) and the electric vacuum cleaner using the motor blower (2) can suppress or reduce a generation of abnormal noise even under operational conditions of low airflow rate and high frequency region.







Search report